Illumination system, wavelength conversion module, projection apparatus and illumination control method

This application claims the priority benefit of China application serial no. 201811620745.2, filed on Dec. 28, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

The invention relates to an optical system, an optical module, an optical device including the optical system and a control method, and particularly relates to an illumination system, a wavelength conversion module, a projection apparatus and an illumination control method.

Recently, projection apparatuses based on solid-state light sources such as Light-Emitting Diode (LED) and laser diode have gradually taken a place in the market. Generally, excitation lights of these solid-state light sources are converted by a wavelength conversion material on a wavelength conversion module in the projection apparatus to produce converted lights of different colors. In order to satisfy a demand in color performance, a filter module is placed on a rear light path of the projection apparatus, and the converted light on the wavelength conversion module is filtered to form predetermined color light after passing through the filter module. The color lights are modulated into an image beam by a light valve for projecting to external.

It is known that a more cost-effectively way for the projection apparatus adopting the laser diode to produce red or green light is to use a blue laser diode to excite a region containing a green or yellow phosphor in a wavelength conversion module to produce yellow or green light. Moreover, the wavelength conversion region containing the green phosphor corresponds to a green filter region of the filter module to filter the green converted light to produce the desired green light; and the wavelength conversion region containing the yellow phosphor corresponds to a red and yellow filter regions of the filter module to respectively filter the yellow converted light to produce the expected red and yellow light.

However, since it is often needed to design different display modes of the projection apparatus for different usage situations to control a color performance of the image to meet the needs of the user. For example, in a theatre mode, the color performance of the image is required to be high, especially the red color performance, so that it is required to increase a current intensity of the excitation light in the time interval corresponding to the output red color light, so as to make the color performance of the image beam to reach the expected color; however, in a briefing reporting mode, a brightness performance of the image is required to be higher, so that the current intensity of the excitation light in the time interval corresponding to the output green or yellow color light is increased to improve the brightness of the image beam.

However, in this way, for the wavelength conversion module, an energy density of the excitation light taken by the region irradiated by the excitation light in the time interval corresponding to the output red color light in the theatre mode is relatively increased, which probably deteriorate and burn such region to accordingly affect light-emitting efficiency and reliability of the wavelength conversion module and meanwhile affect reliability and color performance of the illumination system and the projection apparatus.

The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the invention were acknowledged by a person of ordinary skill in the art.

The invention is directed to an illumination system, which has good reliability, and an output beam has good color performance.

The invention is directed to a wavelength conversion module, which has good reliability, and an output beam has good color performance.

The invention is directed to a projection apparatus, which has good reliability, and an output beam has good color performance.

The invention is directed to an illumination control method, which is adapted to easily adjust an illumination beam, and make a finally output image beam has good color performance.

Other objects and advantages of the invention may be further illustrated by the technical features broadly embodied and described as follows.

In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides an illumination system. The illumination system includes a plurality of excitation light source modules and a wavelength conversion module. The excitation light source modules are used for respectively emitting a plurality of excitation beams. The wavelength conversion module is located on a transmission path of the excitation beams, and includes a substrate, a first region and a second region. The substrate has a first surface and a second surface opposite to each other. The first region is located on the first surface of the substrate, and located on the transmission path of the excitation beams, and has a first inner annular region and a first outer annular region, where the first outer annular region surrounds the first inner annular region. The second region is located on the second surface of the substrate, and is located on the transmission path of the excitation beams, and has a second inner annular region and a second outer annular region, where the second outer annular region surrounds the second inner annular region.

In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides a wavelength conversion module. The wavelength conversion module includes a substrate, a first region and a second region. The substrate has a first surface and a second surface opposite to each other. The first region is located on the first surface of the substrate, and has a first inner annular region and a first outer annular region, where the first outer annular region surrounds the first inner annular region. The second region is located on the second surface of the substrate, and has a second inner annular region and a second outer annular region, where the second outer annular region surrounds the second inner annular region.

In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides a projection apparatus. The projection apparatus includes the aforementioned illumination system, at least one light valve and a projection lens. The light valve is disposed on the transmission path of the illumination beam, and is configured to convert the illumination beam into an image beam. The projection lens is disposed on a transmission path of the image beam, and is configured to convert the image beam into a projection beam.

In order to achieve one or a portion of or all of the objects or other objects, an embodiment of the invention provides an illumination control method adapted to control an illumination system in a projection apparatus. The illumination system has a high chroma illumination mode and a high brightness illumination mode, and includes a plurality excitation light source modules and a wavelength conversion module. The excitation light source modules are used for respectively emitting a plurality of excitation beams, and the wavelength conversion module is located on a transmission path of the excitation beams, and includes a substrate, a first region and a second region, the substrate has a first surface and a second surface opposite to each other, the first region is located on the first surface of the substrate, and the second region is located on the second surface of the substrate. The illumination control method includes following steps. When the illumination system is in the high chroma illumination mode, one of the excitation light source modules provides the excitation beams to the first region, and the excitation beams form a first illumination beam through the first region, or when the illumination system is in the high brightness illumination mode, one of the excitation light source modules provides the excitation beams to the second region, and the excitation beams form a second illumination beam through the second region.

Based on the above description, the embodiments of the invention have at least one of following advantages or effects. In the embodiments of the invention, in the illumination system and the projection apparatus, by respectively configuring the wavelength conversion regions of different structures on the first surface and the second surface of the substrate of the wavelength conversion module, the excitation beams are adapted to irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module when the different illumination modes are selected. In this way, in the illumination system and the projection apparatus, a range or material of each of the wavelength conversion regions on different surfaces of the wavelength conversion module may be correspondingly configured according to the demand of the illumination mode, so as to balance reliability of the illumination system and the projection apparatus and color performance of the output beam, and adjust a color mixing ratio more widely. Moreover, the illumination control method of the embodiment of the invention may easily adjust the illumination beam in the illumination system and the projection apparatus, such that the excitation beams may irradiate the corresponding wavelength conversion regions on different surfaces of the wavelength conversion module when different illumination modes are selected, and therefore the finally output image beam has good color performance.

Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of an optical framework of a projection apparatus according to an embodiment of the invention.

FIG. 2A is a front view of a first region of the wavelength conversion module of FIG. 1 .

FIG. 2B is a front view of a second region of the wavelength conversion module of FIG. 1 .

FIG. 3A is a block diagram of a control module and other components according to an embodiment of the invention.

FIG. 3B is a flowchart illustrating an illumination control method according to an embodiment of the invention.

FIG. 4A is a relationship diagram of transmittances and luminous wavelengths of a first light splitting region of a first light splitting element of FIG. 1 for different color lights.

FIG. 4B is a relationship diagram of transmittances and luminous wavelengths of a second light splitting region of the first light splitting element of FIG. 1 for different color lights.

FIG. 4C is a relationship diagram of transmittances and luminous wavelengths of a third light splitting region of a third light splitting element of FIG. 1 for different color lights.

FIG. 4D is a relationship diagram of transmittances and luminous wavelengths of a fourth light splitting region of the third light splitting element of FIG. 1 for different color lights.

FIG. 4E to FIG. 4H are schematic diagrams of light paths of different color lights of the projection apparatus of FIG. 1 .

FIG. 5A and FIG. 5B are front views of a first region and a second region of another wavelength conversion module according to an embodiment of the invention.

FIG. 6A and FIG. 6B are front views of a first region and a second region of still another wavelength conversion module according to an embodiment of the invention.

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.

FIG. 1 is a schematic diagram of an optical framework of a projection apparatus according to an embodiment of the invention. Referring to FIG. 1 , the projection apparatus 200 includes an illumination system 100 , at least one light valve 210 and a projection lens 220 . For example, in the embodiment, the light valve 210 is a Digital Micro-mirror Device (DMD) or a Liquid-Crystal-On-Silicon (LCOS) panel. However, in other embodiments, the light valve 210 may also be a transmissive liquid crystal panel or other light modulator, and the number of the at least one light valve is not limited.

To be specific, as shown in FIG. 1 , in the embodiment, the illumination system 100 includes a plurality of excitation light source modules 110 and a wavelength conversion module 120 . As shown in FIG. 1 , each of the excitation light source modules 110 includes a first excitation light source 111 and a second excitation light source 112 , which are respectively configured to emit a plurality of excitation beams 50 . In the embodiment, the first excitation light source 111 and the second excitation light source 112 of the excitation light source module 110 are laser light sources, and the excitation beams 50 are blue laser beams. For example, the first excitation light source 111 and the second excitation light source 112 may include a plurality of blue laser diodes (not shown) arranged in an array, though the invention is not limited thereto. Moreover, in the embodiment, the blue laser beams produced by the first excitation light source 111 and the second excitation light source 112 have the same wavelength, and a wavelength range of the blue laser beams is, for example, 440-460 nm. In other embodiments, the blue laser beams produced by the first excitation light source 111 and the second excitation light source 112 may have different wavelengths, and the wavelength range of the blue laser beams is, for example, 440-460 nm.

On the other hand, as shown in FIG. 1 , in the embodiment, the wavelength conversion module 120 is located on a transmission path of the excitation beams 50 , and the wavelength conversion module 120 includes a substrate 121 , a first region R 120 A and a second region R 120 B. The substrate 121 has an axle center (not shown), and the substrate 121 has a first surface 121 A and a second surface 121 B opposite to each other. The first region R 120 A is located on the first surface 121 A of the substrate 121 , and located on the transmission path of the excitation beams 50 . The second region R 120 B is located on the second surface 121 B of the substrate 121 , and is located on the transmission path of the excitation beams 50 .

Detailed structures of the first region R 120 A and the second region R 120 B of the wavelength conversion module 120 are described below with reference of FIG. 2A to FIG. 2B .

FIG. 2A is a front view of the first region R 120 A of the wavelength conversion module 120 of FIG. 1 . FIG. 2B is a front view of the second region R 120 B of the wavelength conversion module 120 of FIG. 1 . To be specific, as shown in FIG. 2A , in the embodiment, the first region R 120 A has a first inner annular region R 121 A and a first outer annular region R 122 A, where the first outer annular region R 122 A surrounds the first inner annular region R 121 A. The first inner annular region R 121 A is disposed between the axle center and the first outer annular region R 122 A. Further, the first inner annular region R 121 A has a first reflection region BR 1 and a first wavelength conversion region WR 1 . Moreover, the first wavelength conversion region WR 1 of the first inner annular region R 121 A includes a first sub-wavelength conversion region YA and a second sub-wavelength conversion region RA. Moreover, the first outer annular region R 122 A of the first region R 120 A has a third reflection region BR 3 and a third wavelength conversion region GA. The first reflection region BR 1 and the third reflection region BR 3 have an effect of reflecting the excitation beams 50 . In other embodiments, a diffuser may also be configured to spoil coherence of the excitation beams 50 .

On the other hand, as shown in FIG. 2B , in the embodiment, the second region R 120 B has a second inner annular region R 121 B and a second outer annular region R 122 B, where the second outer annular region R 122 B surrounds the second inner annular region R 121 B. The second inner annular region R 121 B is disposed between the axle center and the second outer annular region R 122 B. Further, the second inner annular region R 121 B has a second reflection region BR 2 and a second wavelength conversion region WR 2 . Moreover, the second wavelength conversion region WR 2 of the second inner annular region R 121 B includes a third sub-wavelength conversion region YB and a fourth sub-wavelength conversion region RB. Moreover, the second outer annular region R 122 B of the second region R 120 B has a fourth reflection region BR 4 and a fourth wavelength conversion region GB.

To be specific, in the embodiment, the first wavelength conversion region WR 1 of the first region R 120 A includes a first wavelength conversion material and a first bonding material, and the second wavelength conversion region WR 2 of the second region R 120 B includes the first wavelength conversion material and a second bonding material. In the second embodiment, the first bonding material and the second bonding material are the same, which may be implemented by organic adhesion material such as silica gel, etc. In the embodiment, the first wavelength conversion material is, for example, a wavelength conversion material adapted to convert the excitation beam 50 into a yellow beam, and the first wavelength conversion material represents a yellow wavelength conversion material. Moreover, the third reflection region BR 3 of the first region R 120 A and the fourth reflection region BR 4 of the second region R 120 B may also be configured with diffusers to spoil coherence of the excitation beams 50 and make the excitation beams 50 to for blue light.

To be specific, in the embodiment, the first sub-wavelength conversion region YA of the first inner annular region R 121 A of the first region R 120 A and the third sub-wavelength conversion region YB of the second inner annular region R 121 B of the second region R 120 B corresponds to each other, and the second sub-wavelength conversion region RA of the first inner annular region R 121 A of the first region R 120 A and the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B of the second region R 120 B corresponds to each other. The third wavelength conversion region GA of the first outer annular region R 122 A of the first region R 120 A and the fourth wavelength conversion region GB of the second outer annular region R 122 B of the second region R 120 B corresponds to each other. The meaning of “corresponding to each other” refers to that when the excitation beam 50 irradiates the wavelength conversion regions corresponding to each other, colors of the color lights converted by the wavelength conversion regions and output by the illumination system 100 are the same.

How the illumination system 100 forms various color lights of the illumination beam under different modes is described below with reference of FIG. 3A to FIG. 4H .

FIG. 3A is a block diagram of a control module 130 and other components according to an embodiment of the invention. FIG. 3B is a flowchart illustrating an illumination control method according to an embodiment of the invention. To be specific, in the embodiment, the illumination system 100 has a high chroma illumination mode (for example, a theater mode) and a high brightness illumination mode, and as shown in FIG. 3A , the illumination system 100 further includes the control module 130 , and the control module 130 is electrically connected to each of the excitation light source modules 110 . In this way, the control module 130 may control operations of the illumination system 100 and the projection apparatus 200 by switching switches of each of the excitation light source modules 110 . For example, the illumination system 100 and the projection apparatus 200 shown in FIG. 1 and FIG. 3A may execute the illumination control method of FIG. 3B , such that when the illumination system 100 is in the high chroma illumination mode, the control module 130 controls to turn on the excitation light source module 110 located at a left side of FIG. 3A to emit the excitation beams 50 (for example, a left side of FIG. 1 ), and the excitation beams 50 pass through the first region R 120 A to form a first illumination beam 70 A, and when the illumination system 100 is in the high brightness illumination mode, the control module 130 controls to turn on the excitation light source module 110 located at a right side of FIG. 3A to emit the excitation beams 50 (for example, a right side of FIG. 1 ), and the excitation beams 50 pass through the second region R 120 B to form a second illumination beam 70 B, though the invention is not limited thereto. It should be noted that when the illumination system 100 is in the high chroma illumination mode, the control module 130 controls to turn on the excitation light source module 110 located at the left side of FIG. 3A , and meanwhile the control module 130 controls to turn off the excitation light source module 110 located at the right side of FIG. 3A . When the illumination system 100 is in the high brightness illumination mode, the control module 130 controls to turn on the excitation light source module 110 located at the right side of FIG. 3A , and meanwhile the control module 130 controls to turn off the excitation light source module 110 located at the left side of FIG. 3A .

To be specific, as shown in FIG. 3B , in the embodiment, the control module 130 is configured to execute a step 5110 , and the control module 130 selects the high chroma illumination mode or the high brightness illumination mode. The control module 130 controls each of the excitation light source modules 110 to respectively execute a step S 120 A and a step S 130 A or a step S 120 B and a step S 130 B. In detail, as shown in FIG. 3B , in the embodiment, when the illumination system 100 is in the high chroma illumination mode, the control module 130 executes the step S 120 A to control one of the excitation light source modules 110 to provide the excitation beams 50 to the first region R 120 A, and executes the step S 130 A to form the first illumination beam 70 A.

To be more specific, in the embodiment, when the illumination system 100 is in the high chroma illumination mode, the control module 130 controls to turn on the excitation light source module 110 located at the left side of FIG. 3A , and the control module 130 respectively turns on or turns off the first excitation light source 111 and the second excitation light source 112 to provide the excitation beams 50 to the first region R 120 A in different time intervals, so as to form the first illumination beam 70 A respectively including first color light L 1 , second color light L 2 , third color light L 3 and fourth color light L 4 in different time intervals. In the embodiment, the first color light L 1 , the second color light L 2 , the third color light L 3 and the fourth color light L 4 are respectively red light, green light, yellow light and blue light, which is further described below with reference of FIG. 4A to FIG. 4H .

FIG. 4A is a relationship diagram of transmittances and luminous wavelengths of a first light splitting region of a first light splitting element of FIG. 1 for different color lights. FIG. 4B is a relationship diagram of transmittances and luminous wavelengths of a second light splitting region of the first light splitting element of FIG. 1 for different color lights. FIG. 4C is a relationship diagram of transmittances and luminous wavelengths of a third light splitting region of a third light splitting element of FIG. 1 for different color lights. FIG. 4D is a relationship diagram of transmittances and luminous wavelengths of a fourth light splitting region of the third light splitting element of FIG. 1 for different color lights. FIG. 4E to FIG. 4H are schematic diagrams of light paths of different color lights of the projection apparatus of FIG. 1 . To be specific, as shown in FIG. 1 and FIG. 4A to FIG. 4H , in the embodiment, referring to FIG. 1 , the illumination system 100 further includes a first light splitting element DM 1 , a second light splitting element DM 2 , a third light splitting element DM 3 and a fourth light splitting element DM 4 . The first light splitting element DM 1 and the third light splitting element DM 3 are located on transmission paths of lights coming from the first region R 120 A, and the first light splitting element DM 1 has a first light splitting region DM 1 A and a second light splitting region DM 1 B, and the third light splitting element DM 3 has a third light splitting region DM 3 A and a fourth light splitting region DM 3 B. For example, as shown in FIG. 4A , the first light splitting region DM 1 A of the first light splitting element DM 1 may, for example, reflect the green light, and let the beams of other colors (for example, the red light and the blue light) to pass through. Moreover, as shown in FIG. 4B , the second light splitting region DM 1 B of the first light splitting element DM 1 may, for example, reflect the green light and the blue light, and let the beams of other colors (for example, the red light) to pass through. On the other hand, as shown in FIG. 4C , the third light splitting region DM 3 A of the third light splitting element DM 3 may, for example, let the blue light to pass through, but reflect the beams of other colors (for example, the red light, the green light or the yellow light). As shown in FIG. 4D , the fourth light splitting region DM 3 B of the third light splitting element DM 3 may reflect the beams of all of the colors. In other words, in the embodiment, the fourth light splitting region DM 3 B of the third light splitting element DM 3 is a reflecting element, for example, a reflecting coating. The aforementioned light splitting elements are, for example, dichroic mirrors, and the light splitting regions may be dichroic coatings.

Moreover, as shown in FIG. 1 , FIG. 4A to FIG. 4H , in the embodiment, the second light splitting element DM 2 and the fourth light splitting element DM 4 are located on transmission paths of lights coming from the second region R 120 B, and the second light splitting element DM 2 is the same with the first light splitting element DM 1 , the fourth light splitting element DM 4 is the same with the third light splitting element DM 3 . The second light splitting element DM 2 has a first light splitting region DM 2 A and a second light splitting region DM 2 B, and the fourth light splitting element DM 4 has a third light splitting region DM 4 A and a fourth light splitting region DM 4 B.

It should be noted that the yellow light coming from the first region R 120 A may be reflected by the third light splitting region DM 3 A and the fourth light splitting region DM 3 B of the third light splitting element DM 3 , and is filtered by the first light splitting region DM 1 A and the second light splitting region DM 1 B of the first light splitting element DM 1 to leave the red light (to reflect or adsorb a part of wavelengths in the yellow light, and let a part of wavelengths in the yellow light to pass through), where a color of a part of the wavelengths penetrating through the first light splitting region DM 1 A and the second light splitting region DM 1 B is the red light, and the red light leaves the first light splitting element DM 1 . Alternatively, the yellow light coming from the second region R 120 B may be reflected by the third light splitting region DM 4 A and the fourth light splitting region DM 4 B of the fourth light splitting element DM 4 , and is filtered by the first light splitting region DM 2 A and the second light splitting region DM 2 B of the second light splitting element DM 2 to leave the red light, and the red light leaves the second light splitting element DM 2 .

In this way, as shown in FIG. 1 , FIG. 3A , FIG. 3B and FIG. 4E to FIG. 4H , when the illumination system 100 is in the high chroma illumination mode, the method that the control module 130 executes the step 5120 may include following steps.

First, as shown in FIG. 4E , the control module 130 turns off the first excitation light source 111 and turns on the second excitation light source 112 during a first time interval, in this way, the excitation beam 50 may first penetrate through the third light splitting region DM 3 A of the third light splitting element DM 3 , and is incident to the second sub-wavelength conversion region RA of the first inner annular region R 121 A to form the third color light L 3 . Thereafter, the third color light L 3 coming from the second sub-wavelength conversion region RA is transmitted to the first light splitting element DM 1 after being reflected by the third light splitting region DM 3 A and the fourth light splitting region DM 3 B of the third light splitting element DM 3 , and is filtered by the first light splitting region DM 1 A and the second light splitting region DM 1 B of the first light splitting element DM 1 (to reflect or adsorb a part of wavelengths, and let a part of wavelengths to pass through) to form the first color light L 1 of the first illumination beam 70 A.

Then, as shown in FIG. 4F , the control module 130 turns on the first excitation light source 111 and turns off the second excitation light source 112 during a second time interval, in this way, the excitation beam 50 may first penetrate through the first light splitting region DM 1 A of the first light splitting element DM 1 , and is incident to the third wavelength conversion region GA of the first outer annular region R 122 A to form the second color light L 2 . Thereafter, the second color light L 2 coming from the third wavelength conversion region GA of the first outer annular region R 122 A is transmitted to the subsequent optical elements after being reflected by the first light splitting region DM 1 A and the second light splitting region DM 1 B of the first light splitting element DM 1 to form the second color light L 2 of the first illumination beam 70 A.

Then, as shown in FIG. 4G , the control module 130 simultaneously turns on the first excitation light source 111 and the second excitation light source 112 during a third time interval, and when the excitation beams 50 respectively penetrate through the third light splitting region DM 3 A of the third light splitting element DM 3 and the first light splitting region DM 1 A of the first light splitting element DM 1 to irradiate the first sub-wavelength conversion region YA of the first inner annular region R 121 A and the third wavelength conversion region GA of the first outer annular region R 122 A, the excitation beams 50 may form the third color light L 3 through the first sub-wavelength conversion region YA of the first inner annular region R 121 A and form the second color light L 2 through the third wavelength conversion region GA of the first outer annular region R 122 A. Thereafter, the third color light L 3 coming from the first sub-wavelength conversion region YA is reflected by the third light splitting region DM 3 A and the fourth light splitting region DM 3 B of the third light splitting element DM 3 and transmitted to the first light splitting element DM 1 , and is filtered by the first light splitting region DM 1 A and the second light splitting region DM 1 B of the first light splitting element DM 1 to form the first color light L 1 for transmitting to the subsequent optical elements, and the second color light L 2 coming from the third wavelength conversion region GA of the first outer annular region R 122 A is reflected by the first light splitting region DM 1 A and the second light splitting region DM 1 B of the first light splitting element DM 1 and transmitted to the subsequent optical elements. Moreover, as shown in FIG. 4G , the filtered first color light L 1 and the second color light L 2 coming from the first light splitting element DM 1 may be mixed into the third color light L 3 to form the third color light L 3 of the first illumination beam 70 A.

Then, as shown in FIG. 4H , when the control module 130 simultaneously turns on the first excitation light source 111 and the second excitation light source 112 during a fourth time interval, and the excitation beams 50 respectively penetrate through the third light splitting region DM 3 A of the third light splitting element DM 3 and the first light splitting region DM 1 A of the first light splitting element DM 1 to irradiate the first reflection region BR 1 and the third reflection region BR 3 , the excitation beams 50 form the fourth color light L 4 through the first reflection region BR 1 and the third reflection region BR 3 , and are reflected by the fourth light splitting region DM 3 B of the third light splitting element DM 3 and the second light splitting region DM 1 B of the first light splitting element DM 1 for transmitting to the subsequent optical elements to form the fourth color light L 4 of the first illumination beam 70 A.

In this way, after the steps shown in FIG. 4E to FIG. 4H are completed, the control module 130 completes the step S 130 A to form the first illumination beam 70 A including the first color light L 1 , the second color light L 2 , the third color light L 3 and the fourth color light L 4 .

On the other hand, referring to FIG. 3B again, in the embodiment, when the illumination system 100 is in the high brightness illumination mode, the control module 130 executes the step S 120 B to control the excitation light source modules 110 to provide the excitation beams 50 to the second region R 120 B, and executes the step S 130 B to form the second illumination beam 70 B.

Similar to the steps S 120 A and S 130 A, when the illumination system 100 is in the high brightness illumination mode, the control module 130 executes the steps S 120 B and S 130 B may also respectively turn on or turn of the first excitation light source 111 and the second excitation light source 112 used for providing the excitation beams 50 to the second region R 120 B during different time intervals, so as to form the second illumination beam 70 B including the first color light L 1 , the second color light L 2 , the third color light L 3 and the fourth color light L 4 during the different time intervals. Moreover, the method that the control module 130 executes the steps S 120 B and S 130 B may refer to the steps shown in FIG. 4E to FIG. 4H .

For example, as shown in FIG. 4E , when the illumination system 100 is in the high brightness illumination mode, the control module 130 may turn off the first excitation light source 111 and turn on the second excitation light source 112 during the first time interval, such that the excitation beam 50 forms the first color light L 1 of the second illumination beam 70 B through the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B. As shown in FIG. 4F , the control module 130 may turn on the first excitation light source 111 and turn off the second excitation light source 112 during the second time interval, such that the excitation beam 50 forms the second color light L 2 of the second illumination beam 70 B through the fourth sub-wavelength conversion region GB of the second outer annular region R 122 B. As shown in FIG. 4G , the control module 130 simultaneously turns on the first excitation light source 111 and the second excitation light source 112 during the third time interval, and the excitation beams 50 irradiate the third sub-wavelength conversion region YB of the second inner annular region R 121 B to form the third color light L 3 , and irradiate the fourth wavelength conversion region GB of the second outer annular region R 122 B to form the second color light L 2 , and after being filtered by the second light splitting element DM 2 , the third color light L 3 and the second color light L 2 form the third color light L 3 of the second illumination beam 70 B. As shown in FIG. 4H , when the control module 130 simultaneously turns on the first excitation light source 111 and the second excitation light source 112 during the fourth time interval, and the excitation beams 50 irradiate the second reflection region BR 2 and the fourth reflection region BR 4 , the excitation beams 50 form the fourth color light L 4 through the second reflection region BR 2 and the fourth reflection region BR 4 . Other detailed descriptions may refer to related paragraphs, and details thereof are not repeated.

To be specific, referring to FIG. 2A and FIG. 2B again, in the embodiment, the first region R 120 A and the second region R 120 B are fabricated at two side edges of the substrate 121 . By placing the first region R 120 A and the second region 120 B on the same reference plane, the first wavelength conversion region WR 1 of the first inner annular region R 121 A of the first region R 120 A and the second wavelength conversion region WR 2 of the second inner annular region R 121 B of the first region R 120 A have the same angle. However, the second sub-wavelength conversion region RA of the first inner annular region R 121 A and the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B have different angles. For example, the first wavelength conversion region WR 1 of the first inner annular region R 121 A is, for example, 240 degrees, though the invention is not limited thereto. To be more specific, an angle range of the second sub-wavelength conversion region RA of the first inner annular region R 121 A is greater than an angle range of the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B. In this way, when the illumination system 100 is in the high chroma illumination mode, since the angle range of the second sub-wavelength conversion region RA of the first inner annular region R 121 A is large, the first illumination beam 70 A may have a high proportion of red light, so as to satisfy the requirement on the color performance of an output projection beam 90 . On the other hand, when the illumination system 100 is in the high brightness illumination mode, since the angle range of the third sub-wavelength conversion region YB of the second inner annular region R 121 B is large, the second illumination beam 70 B may have a low proportion of red light and a high proportion of yellow light, so as to enhance a brightness of the output beam.

Then, referring to FIG. 1 again, the illumination system 100 further includes a plurality of light uniforming elements 140 . The light uniforming elements 140 are located between the first light splitting element DM 1 and the light valve 210 , or located between the second light splitting element DM 2 and the light valve 210 , and the light uniforming elements 140 are respectively located on the transmission paths of the first illumination beam 70 A and the second illumination beam 70 B. In the embodiment, the light uniforming element 140 includes an integration rod, though the invention is not limited thereto. To be more specific, as shown in FIG. 1 , after the illumination system 100 respectively forms the first illumination beam 70 A or the second illumination beam 70 B according to the selected illumination mode, the first illumination beam 70 A or the second illumination beam 70 B is transmitted to the light uniforming element 140 , and the first illumination beam 70 A or the second illumination beam 70 B is uniformed by the light uniforming element 140 , and is transmitted to the light valve 210 through a light transmitting module LT.

Then, as shown in FIG. 1 , the light valve 210 is located on the transmission path of the first illumination beam 70 A or the second illumination beam 70 B, and is used for converting the first illumination beam 70 A or the second illumination beam 70 B into an image beam 80 . The projection lens 220 is located on a transmission path of the image beam 80 , and is used for converting the image beam 80 into a projection beam 90 , so as to project the image beam 80 onto a screen 230 to form an image. After the first illumination beam 70 A or the second illumination beam 70 B is converged to the light valve 210 , since the light valve 210 converts the first illumination beam 70 A or the second illumination beam 70 B into the image beam 80 of different colors in timing and transmits the image beam 80 to the projection lens 220 , the image projected from the image beam 80 converted by the light valve 210 may become a color image.

In this way, in the illumination system 100 and the projection apparatus 200 , by respectively configuring the wavelength conversion regions of different structures on the first surface 121 A and the second surface 121 B of the substrate 121 of the wavelength conversion module 120 , the different excitation light source modules 110 may be independently controlled when the different illumination mode is selected. Therefore, the illumination system 100 makes the excitation beams 50 to irradiate the corresponding wavelength conversion regions on different surfaces of the wavelength conversion module 120 . In this way, in the illumination system 100 and the projection apparatus 200 , a range of each of the wavelength conversion regions on the different surfaces of the wavelength conversion module 120 may be correspondingly designed according to the requirement of the illumination mode. Since the illumination system 100 and the projection apparatus 200 under such configuration are unnecessary to enhance the energy density of the excitation beams 50 under the high chroma illumination mode, although the organic adhesion material such as silica gel, etc., is taken as the bonding material for each of the wavelength conversion regions of the wavelength conversion module 120 , the energy density of the excitation beams 50 may also be controlled within a range that each of the wavelength conversion regions on the different surfaces of the wavelength conversion module 120 may withstand, so as to balance the reliability of the illumination system 100 and the projection apparatus 200 and the color performance of the output beam. Moreover, since the first region R 120 A and the second region R 120 B of the wavelength conversion module 120 respectively have a structural dual-annular design of inner and outer annular regions, the configuration design of each of the wavelength conversion regions has greater layout flexibility, so that a color mixing ratio may be adjusted more widely.

Moreover, the illumination control method of the embodiment is adapted to easily adjust the illumination beam in the aforementioned illumination system 100 and the projection apparatus 200 , such that when the different illumination modes are selected, the excitation beams 50 may irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module 120 , such that the finally output image beam 80 may have good color performance.

It should be noted that in the aforementioned wavelength conversion module 120 , although the range of the second sub-wavelength conversion region RA of the first inner annular region R 121 A is different to the range of the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B, the invention is not limited thereto. In other embodiments, the range of the second sub-wavelength conversion region RA of the first inner annular region R 121 A may also be the same with the range of the fourth sub-wavelength conversion region RB of the second inner annular region R 121 B, and the different color performance of the first illumination beam 70 A or the second illumination beam 70 B is achieved through other configurations. Different embodiments are described below with reference of FIG. 5A to FIG. 6B .

FIG. 5A and FIG. 5B are front views of a first region and a second region of another wavelength conversion module according to an embodiment of the invention. Referring to FIG. 5A and FIG. 5B , the first region R 520 A and the second region R 520 B of the wavelength conversion module 520 of the embodiment are similar to the first region R 120 A and the second region R 120 B of the wavelength conversion module 120 of FIG. 2A and FIG. 2B , and differences there between are as follows. As shown in FIG. 5A and FIG. 5B , in the embodiment, the first region R 520 A and the second region R 520 B are placed on the same reference plane, the second sub-wavelength conversion region RA of the first inner annular region R 521 A and the fourth sub-wavelength conversion region RB of the second inner annular region R 521 B have the same angle. However, in the embodiment, the first bonding material and the second bonding material are different. For example, in the embodiment, the first bonding material of the first wavelength conversion region WR 1 of the first region R 520 A may be an inorganic adhesion material such as ceramics or silica, which is mixed with the first wavelength conversion material and sintered to form the first region R 520 A. Namely, the first region R 520 A is formed through a Phosphor in Glass (PIG) process or a Phosphor in Ceramic (PIC) process, and is adapted to withstand a higher energy density of the excitation beams 50 . The second bonding material of the second wavelength conversion region WR 2 of the second region R 520 B may be an organic adhesion material such as silica gel, etc.

Therefore, when the wavelength conversion module 520 is applied to the illumination system 100 and the projection apparatus 200 of FIG. 1 , since the first wavelength conversion region WR 1 of the first region R 520 A may withstand higher energy density of the excitation beams 50 , in case of the high chroma illumination mode, the control module 130 of the illumination system 100 may increase a current intensity of the excitation beams in the time interval corresponding to the output red color light, so that the color performance of the image beam 80 may reach the expected color without causing deterioration and burning of the first wavelength conversion region WR 1 . On the other hand, in case of the high brightness illumination mode, the control module 130 may decrease the current intensity of the excitation beams in the time interval corresponding to the output red color light, so that the current intensity of the excitation beams in the time interval corresponding to the output green color or yellow color light is greater than that of the red color light, so as to improve the brightness of the image beam 80 .

Therefore, when the wavelength conversion module 520 is applied to the illumination system 100 and the projection apparatus 200 of FIG. 1 , in the illumination system 100 and the projection apparatus 200 , by respectively configuring the wavelength conversion regions of different structures on the first surface 121 A and the second surface 121 B of the substrate 121 of the wavelength conversion module 520 , the different excitation light source modules 110 may be independently controlled when the different illumination mode is selected. Therefore, the illumination system 100 makes the excitation beams 50 to irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module 520 . In this way, in the illumination system 100 and the projection apparatus 200 , a range or material of each of the wavelength conversion regions on the different surfaces of the wavelength conversion module 520 may be correspondingly designed according to the requirement of the illumination mode, so as to balance the reliability of the illumination system 100 and the projection apparatus 200 and the color performance of the output beam. Moreover, since the first region R 520 A and the second region R 520 B of the wavelength conversion module 520 respectively have the structural dual-annular design of inner and outer annular regions, the configuration design of each of the wavelength conversion regions has greater layout flexibility, so that a color mixing ratio may be adjusted more widely.

Moreover, the illumination system 100 and the projection apparatus 200 adopting the wavelength conversion module 520 may also execute the aforementioned illumination control method to easily adjust the illumination beams in the illumination system 100 and the projection apparatus 200 , and when the different illumination modes are selected, the excitation beams 50 may irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module 520 , such that the finally output image beam 80 may have good color performance, and the illumination system 100 and the projection apparatus 200 may achieve the similar effects and advantages, and detail thereof is not repeated.

FIG. 6A and FIG. 6B are front views of a first region and a second region of still another wavelength conversion module according to an embodiment of the invention. Referring to FIG. 6A and FIG. 6B , the first region R 620 A and the second region R 620 B of the wavelength conversion module 620 of the embodiment are similar to the first region R 520 A and the second region R 520 B of the wavelength conversion module 520 of FIG. 5A and FIG. 5B , and differences there between are as follows. As shown in FIG. 6A and FIG. 6B , in the embodiment, the first bonding material and the second bonding material are the same, which may be the organic adhesion material such as silica gel, etc. However, in the embodiment, the first sub-wavelength conversion region YA in the first wavelength conversion region WR 1 includes a first wavelength conversion material, the second sub-wavelength conversion region RA in the first wavelength conversion region WR 1 includes a second wavelength conversion material, the third sub-wavelength conversion region YB in the second wavelength conversion region WR 2 includes the first wavelength conversion material, and the fourth sub-wavelength conversion region RB in the second wavelength conversion region WR 2 includes the second wavelength conversion material, and a wavelength of color light formed through the second wavelength conversion material is greater than a wavelength of color light formed through the first wavelength conversion material. For example, in the embodiment, the second wavelength conversion material is, for example, a red wavelength conversion material or a long wavelength yellow wavelength conversion material.

Therefore, when the wavelength conversion module 620 is applied to the illumination system 100 of FIG. 1 , and the illumination system 100 is in the high chroma illumination mode, since a wavelength of the beam converted by the second sub-wavelength conversion region RA of the first inner annular region R 621 A is longer, the first illumination beam 70 A may have a higher proportion of red light, which satisfies a color performance requirement of the output beam.

In this way, when the wavelength conversion module 620 is applied to the illumination system 100 and the projection apparatus 200 of FIG. 1 , in the illumination system 100 and the projection apparatus 200 , by respectively configuring the wavelength conversion regions of different structures on the first surface 121 A and the second surface 121 B of the substrate 121 of the wavelength conversion module 620 , the different excitation light source modules 110 may be independently controlled when the different illumination mode is selected. Therefore, the illumination system 100 makes the excitation beams 50 to irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module 620 . In this way, in the illumination system 100 and the projection apparatus 200 , a range or material of each of the wavelength conversion regions on the different surfaces of the wavelength conversion module 620 may be correspondingly configured according to the requirement of the illumination mode, and since the illumination system 100 and the projection apparatus 200 under such configuration are unnecessary to enhance the energy density of the excitation beams 50 under the high chroma illumination mode, although the organic adhesion material such as silica gel, etc., is taken as the bonding material for each of the wavelength conversion regions of the wavelength conversion module 620 , the energy density of the excitation beams 50 may also be controlled within a range that each of the wavelength conversion regions on the different surfaces of the wavelength conversion module 620 may withstand, so as to balance the reliability of the illumination system 100 and the projection apparatus 200 and the color performance of the output beam. Moreover, since the first region R 620 A and the second region R 620 B of the wavelength conversion module 620 respectively have the structural dual-annular design of inner and outer annular regions, the configuration design of each of the wavelength conversion regions has greater layout flexibility, so that a color mixing ratio may be adjusted more widely.

Moreover, the illumination system 100 and the projection apparatus 200 adopting the wavelength conversion module 620 may also execute the aforementioned illumination control method to easily adjust the illumination beams in the illumination system 100 and the projection apparatus 200 , and when the different illumination modes are selected, the excitation beams 50 may irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module 620 , such that the finally output image beam 80 may have good color performance, and the illumination system 100 and the projection apparatus 200 may achieve the similar effects and advantages, and detail thereof is not repeated.

In summary, the embodiments of the invention have at least one of following advantages or effects. In the embodiments of the invention, in the illumination system and the projection apparatus, by respectively configuring the wavelength conversion regions of different structures on the first surface and the second surface of the substrate of the wavelength conversion module, the excitation beams are adapted to irradiate the corresponding wavelength conversion regions on the different surfaces of the wavelength conversion module when the different illumination modes are selected. In this way, in the illumination system and the projection apparatus, a range or material of each of the wavelength conversion regions on different surfaces of the wavelength conversion module may be correspondingly configured according to the demand of the illumination mode, so as to balance reliability of the illumination system and the projection apparatus and color performance of the output beam, and adjust a color mixing ratio more widely. Moreover, the illumination control method of the embodiment of the invention may easily adjust the illumination beam in the illumination system and the projection apparatus, such that the excitation beams may irradiate the corresponding wavelength conversion regions on different surfaces of the wavelength conversion module when different illumination modes are selected, and therefore the finally output image beam has good color performance.

The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.