Organic light-emitting diode display

This application claims priority to and the benefit of Korean Patent Application No. 10-2013-0046996, filed in the Korean Intellectual Property Office on Apr. 26, 2013, the entire contents of which are incorporated herein by reference.

(a) Field

Aspects of embodiments of the present invention relate to an organic light emitting diode (OLED) display.

(b) Description of the Related Art

A display device is a device for displaying an image. Recently, OLED displays have received attention. Since OLED displays have self-emission characteristics and do not require separate light sources, which is unlike liquid crystal display devices, it is possible to reduce their thickness and weight when compared to those of older technologies. Further, OLED displays have high-quality characteristics such as low power consumption, high luminance, and high response speed.

In general, an OLED display includes a first substrate, a first electrode disposed on the first substrate, a pixel defining layer including an opening that exposes the first electrode, an organic emission layer disposed on the first electrode corresponding to the opening, a second electrode disposed on the organic emission layer, and a second substrate disposed on the first electrode.

A more recent OLED display may further include a spacer disposed on a pixel defining layer to reduce or minimize interference due to the second substrate by increasing a gap between an organic emission layer and the second substrate. However, in a conventional OLED display including a spacer, the spacer is simply disposed on an unopened portion of the pixel defining layer without regard to the shape of the opening included in the pixel defining layer.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the present invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Embodiments of the present invention relate to a pixel alignment structure of an organic light emitting device. More particularly, embodiments of the present invention relate to a pixel structure including an OLED and spacers disposed on a pixel defining layer that exposes a first electrode of the OLED.

Embodiments of the present invention provide for an OLED display including spacers disposed on a pixel defining layer and considering the shape of openings included in the pixel defining layer to reduce or minimize interference of a substrate with respect to an organic emission layer by increasing an area ratio of the spacers in the entire area of the OLED display.

In an embodiment of the present invention, an organic light emitting diode (OLED) display is provided. The OLED display includes: a first electrode around a center point of a virtual square; second electrodes around a first vertex and a second vertex diagonal to the first vertex of the virtual square, the second electrodes being separated from each other and with the center point of the virtual square interposed therebetween; third electrodes around a third vertex and a fourth vertex of the virtual square, the third electrodes being separated from each other and with the center point of the virtual square interposed therebetween; a pixel defining layer partially on the first electrode, the second electrodes, and the third electrodes, and partially exposing the first electrode, the second electrodes, and the third electrodes; and four spacers disposed as islands on the pixel defining layer and corresponding to four sides of the virtual square.

The pixel defining layer may have a first opening that exposes the first electrode and has a first polygon shape whose center coincides with the center point of the virtual square, second openings that expose the second electrodes and have second polygonal shapes whose centers coincide with the first vertex and the second vertex, and third openings that expose the third electrodes and have third polygonal shapes whose centers coincide with the third vertex and the fourth vertex.

Distances between the center point of the virtual square and centers of the four spacers may be the same.

Each of the four spacers may have a square shape.

Each of the spacers may have a rectangle shape having long sides that are bisected by a respective one of the four sides of the virtual square.

Each of the second openings and the third openings may have a larger area compared to that of the first opening.

Each of the second openings may have a larger area than that of each of the third openings.

At least one of the first polygonal shape, the second polygonal shapes, or the third polygonal shapes may be an octagon.

The first polygonal shape may be an octagon, and one of the second polygonal shapes and one of the third polygonal shapes may be a hexagon and a quadrilateral.

The first opening may include a plurality of first openings, and neighboring ones of the plurality of first openings may have symmetrical octagonal shapes.

Distances between the first opening and each of the second openings, and distances between the first opening and each of the third openings may be a same first length.

Distances between each of the second openings and each of the third openings may be a same second length, and distances between the neighboring ones of the plurality of first openings may be a same third length that is longer than each of the first length and the second length.

The OLED display may further include a first organic emission layer on the first electrode corresponding to the first opening, second organic emission layers on the second electrodes and corresponding to the second openings, and third organic emission layers on the third electrodes and corresponding to the third openings.

The first organic emission layer may be configured to emit a first color light, the second organic emission layers may be configured to emit a second color light different from the first color light, and the third organic emission layers may be configured to emit a third color light different from the first color light and the second color light.

The first color light may be green, and the second color light and the third color light may be blue and red.

According to one embodiment of the present invention, spacers are provided on a pixel defining layer of the OLED display in consideration of the shape of openings included in the pixel defining layer to reduce or minimize interference of a substrate with respect to an organic emission layer by increasing an area ratio of the spacers to the entire area.

FIG. 1 partially shows a plane surface of an OLED display according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along the line II-II.

FIG. 3 partially shows a plane surface of an OLED display according to a second embodiment of the present invention.

In the following detailed description, only certain embodiments of the present invention have been shown and described, simply by way of illustration. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification. In addition, the size and thickness of each configuration shown in the drawings may be arbitrarily shown for better understanding and ease of description, but the present invention is not limited thereto.

In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements. Throughout, when a first element is described as being “coupled” to a second element, it may be directly coupled (e.g., connected) to the second element or indirectly coupled (e.g., electrically connected) to the second element via one or more third elements. Herein, the use of the term “may,” when describing embodiments of the present invention, refers to “one or more embodiments of the present invention.” In addition, the use of alternative language, such as “or,” when describing embodiments of the present invention, refers to “one or more embodiments of the present invention” for each corresponding item listed.

Hereinafter, an OLED display 1000 according to a first embodiment of the present invention will described with reference to FIG. 1 and FIG. 2 . FIG. 1 partially shows a plane surface of the OLED display 1000 . For convenience, a first electrode, a pixel defining layer, an organic emission layer, and a spacer are mainly illustrated in FIG. 1 . FIG. 2 is a cross-sectional view of FIG. 1 taken along the line II-II.

As shown in FIG. 1 and FIG. 2 , the OLED display 1000 includes a first substrate SU 1 , a circuit portion PC, a first electrode E 1 , a second electrode E 2 , a third electrode E 3 , a pixel defining layer PDL, a first organic emission layer OL 1 , a second organic emission layer OL 2 , a third organic emission layer OL 3 , a first spacer SP 1 , a second spacer SP 2 , a third spacer SP 3 , a fourth spacer SP 4 , a common electrode CE, and a second substrate SU 2 .

The first substrate SU 1 is formed of an insulating substrate made of glass, quartz, ceramic, metal, plastic, or the like. In addition, when the first substrate SU 1 is made of plastic, the OLED display 1000 may have a flexible, stretchable, or rollable characteristic.

The circuit portion PC is disposed on the first substrate SU 1 , and may include wires including one or more scan lines, data lines, driving power lines, common power lines, pixel circuits, and the like. Each pixel circuit may correspond to one pixel and may include two or more thin film transistors (TFTs) coupled to the wires, one or more capacitors, and the like. The circuit portion PC may be formed to have various structures known to one of ordinary skill in the art.

The first electrode E 1 is positioned on the circuit part PC, and is coupled to one of the TFTs of the circuit part PC. A central area of the first electrode E 1 is positioned at a center point CP of a virtual square VS.

Here, the virtual square VS includes the center point CP, a first vertex P 1 , a second vertex P 2 , a third vertex P 3 , a fourth vertex P 4 , a first side V 1 , a second side V 2 , a third side V 3 , and a fourth side V 4 . In further detail, the first side V 1 of the virtual square VS connects between the first vertex P 1 and the third vertex P 3 , the second side V 2 connects between the third vertex P 3 and the second vertex P 2 , the third side V 3 connects between the second vertex P 2 and the fourth vertex P 4 , and the fourth side V 4 connects between the fourth vertex P 4 and the first vertex P 1 . In addition, the first vertex P 1 and the second vertex P 2 of the virtual square VS are diagonal to each other (with the center point CP interposed therebetween), the third vertex P 3 and the fourth vertex P 4 are diagonal to each other (with the center point CP interposed therebetween), and both the third vertex P 3 and the fourth vertex P 4 neighbor both the first vertex P 1 and the second vertex P 2 .

The first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 have the same length such that the virtual square VS is formed. The first electrode E 1 may have various polygonal shapes, and a center area of the first electrode E 1 is exposed by a first opening portion (or first opening) OM 1 of the pixel defining layer PDL.

The second electrode E 2 is disposed on the circuit portion PC and is separated from the first electrode E 1 . The second electrode E 2 is coupled to a TFT of the circuit portion PC. Within and around the virtual square VS, the second electrode E 2 is provided as a pair of second electrodes E 2 , and the second electrodes E 2 are separated from each other, with the first electrode E 1 interposed therebetween. Respective center areas of the second electrodes E 2 are disposed around the first vertex P 1 and the second vertex P 2 of the virtual square VS. The second electrode E 2 may have various polygonal shapes, and the center area of the second electrode E 2 may be exposed by a second opening portion (or second opening) OM 2 of the pixel defining layer PDL.

The third electrode E 3 is separated from the first electrode E 1 and the second electrode E 2 , and is disposed on the circuit portion PC. The third electrode E 3 is coupled to one of the TFTs of the circuit portion PC. Within and around the virtual square VS, the third electrode E 3 is provided as a pair of third electrodes E 3 , and the third electrodes E 3 are separated from each other, with the first electrode E 1 interposed therebetween. Center regions of the respective third electrodes E 3 are disposed on the third vertex P 3 and the fourth vertex P 4 of the virtual square VS. The third electrode E 3 may have various polygonal shapes, and the center area of the third electrode E 3 is exposed by a third opening portion (or third opening) OM 3 of the pixel defining layer PDL.

The second electrodes E 2 and the third electrodes E 3 are disposed on and around the virtual square VS, with the first electrode E 1 interposed therebetween. That is, the second electrodes E 2 and the third electrodes E 3 surround the first electrode E 1 , centering the first electrode E 1 . The first electrode E 1 , the second electrodes E 2 , and the third electrodes E 3 may be anodes or cathodes functioning as hole injection electrodes. The first electrode E 1 , the second electrodes E 2 , and the third electrodes E 3 may be formed as light transmissive electrodes or light reflective electrodes.

The pixel defining layer PDL is disposed on the first electrode E 1 , the second electrode E 2 , and the third electrode E 3 , and covers the edge of each of the first electrode E 1 , the second electrode E 2 , and the third electrode E 3 . The pixel defining layer PDL includes the first opening portion OM 1 , the second opening portion OM 2 , and the third opening portion OM 3 , respectively exposing the first electrode E 1 , the second electrode E 2 , and the third electrode E 3 .

The first opening OM 1 exposes the first electrode E 1 , and has a first polygonal shape, for example, an octagon. The first opening OM 1 is separated from the third opening OM 3 and the second opening OM 2 , and the center of the first opening OM 1 coincides with the center point CP of the virtual square VS. The first opening OM 1 has a smaller area compared to the second opening OM 2 and the third opening OM 3 that neighbor the first opening OM 1 . While the first opening OM 1 in FIG. 1 is formed in the shape of an octagon, the shape of the first opening OM 1 is not limited thereto. In other embodiments, the first opening OM 1 may have various polygonal shapes such as a triangle, a quadrilateral, a pentagon, a hexagon, a heptagon, or the like.

While the above description focused on a single virtual square VS having a single first electrode E 1 , the OLED display 1000 has a plurality of virtual squares VS, each centered with a different one of a corresponding plurality of first electrodes E 1 and first openings OM 1 . In the OLED display 1000 of FIG. 1 , all neighboring (e.g., sharing a same row or column) first openings OM 1 among the plurality of first openings OM 1 have symmetric octagonal shapes (that are mirror images of each other), while all diagonal first openings OM 1 have the same octagonal shape. In other embodiments, each of the plurality of first openings OM 1 may have the same octagonal shape.

In the OLED display 1000 of FIG. 1 , a first organic emission layer OL 1 for emitting green light is disposed on each first electrode E 1 that is exposed by its corresponding first opening OM 1 . In other embodiments, an organic emission layer for emitting light of various colors such as blue, red, or white may be disposed on each first electrode E 1 that is exposed by its corresponding first opening OM 1 .

In and around the virtual square VS, the second openings OM 2 expose the second electrodes E 2 , and have a second polygonal shape, for example, a hexagon. The second openings OM 2 are separated from each of the third openings OM 3 and the first opening OM 1 , and the centers of the second openings OM 2 coincide with the first vertex P 1 and the second vertex P 2 of the virtual square VS. Each of the second openings OM 2 has a larger area compared to each of the first opening OM 1 and the third openings OM 3 . The second openings OM 2 in FIG. 1 have a hexagonal shape, but the present invention is not limited thereto. In other embodiments, the second openings OM 2 may have various polygonal shapes such as triangles, quadrilaterals, pentagons, hexagons, heptagons, octagons, or the like.

The OLED display 1000 of FIG. 1 has a plurality of second openings OM 2 that have the same hexagonal shape. The plurality of second openings OM 2 are separated from each other, with each pair of diagonal second openings OM 2 sharing a first opening OM 1 therebetween. In the OLED display 1000 of FIG. 1 , second organic emission layers OL 2 for emitting blue light are disposed on the second electrodes E 2 that are exposed by the second openings OM 2 . In other embodiments, organic emission layers for emitting light of various colors such as green, red, or white may be disposed on the second electrodes E 2 that are exposed by the second openings OM 2 .

In and around the virtual square VS, the third openings OM 3 expose the third electrodes E 3 , and have a third polygonal shape, for example, a quadrilateral. The third openings OM 3 are separated from each of the first opening OM 1 and the second openings OM 2 , and the centers of the third openings OM 3 coincide with the third vertex P 3 and the fourth vertex P 4 of the virtual square VS. Each of the third openings OM 3 has a larger area compared to its neighboring first opening OM 1 and has a smaller area compared to each of its neighboring second openings OM 2 . The third openings OM 3 have a quadrilateral shape (in this case, a parallelogram shape), but the present invention is not limited thereto. In other embodiments, the third openings OM 3 may have various polygonal shapes such as triangles, pentagons, hexagons, heptagons, octagons, or the like.

The OLED display 1000 has a plurality of third openings OM 3 that have the same quadrilateral shape. The plurality of third openings OM 3 are separated from each other, with each pair of diagonal third openings OM 3 sharing a first opening OM 1 therebetween. In the OLED display 1000 of FIG. 1 , third organic emission layers OL 3 for emitting red light are disposed on the third electrodes E 3 exposed by the third openings OM 3 . In other embodiments, organic emission layers for emitting light of various colors such as blue, green, or white may be disposed on the third electrodes E 3 that are exposed by the third openings OM 3 .

One of the shapes, such as the first polygon, the second polygon, or the third polygon of the first opening OM 1 , the second opening OM 2 , or the third opening OM 3 , respectively, may have an octagonal shape. In the OLED display 1000 , the plurality of first openings OM 1 are sequentially arranged along virtual first lines (e.g., rows or columns), and the plurality of second openings OM 2 and the plurality of third openings OM 3 are respectively alternately arranged on virtual second lines (e.g., rows or columns). The virtual first lines are offset by half a pixel from the virtual second lines such that within and around each virtual square VS, the second openings OM 2 of which the centers coincide with the first vertex P 1 and the second vertex P 2 and the third openings OM 3 of which the centers coincide with the third vertex P 3 and the fourth vertex P 4 surround the first opening OM 1 of the virtual square VS.

As described, the center of the first opening OM 1 coincides with the center point of the virtual square VS, the centers of the second openings OM 2 coincide with the first vertex P 1 and the second vertex P 2 , the centers of the third openings OM 3 coincide with the third vertex P 3 and the fourth vertex P 4 , and the second openings OM 2 and the third openings OM 3 surround the first opening OM 1 of the virtual square VS. In the OLED display 1000 of FIG. 1 , the first openings OM 1 , the second openings OM 2 , and the third openings OM 3 respectively have the same polygonal (octagonal, hexagonal, and quadrilateral) shapes so that, within each virtual square VS, a distance between the first opening OM 1 and each of the second openings OM 2 , and a distance between the first opening OM 1 and each of the third opening OM 3 is the same first length L 1 , and a distance between each of the second openings OM 2 and each of the third openings OM 3 is the same second length L 2 that is different from the first length L 1 . Furthermore, between neighboring virtual squares VS, a distance between respective first openings OM 1 is the same third length L 3 that is longer than each of the first length L 1 and the second length L 2 .

The first organic emission layer OL 1 is disposed on each of the first electrodes E 1 corresponding to one of the first openings OM 1 . In the OLED display of FIG. 1 , the first organic emission layer OL 1 includes an organic material for emitting green light and thus, emits green light. In other embodiments, the first organic emission layer OL 1 may include an organic material for emitting red, blue, or white light, and in this case, the first organic emission layer OL 1 emits red light, blue light, or white light.

The second organic emission layer OL 2 is disposed on each of the second electrodes E 2 corresponding to one of the second openings OM 2 . In the OLED display of FIG. 1 , the second organic emission layer OL 2 includes an organic material for emitting blue light and thus, emits blue light. In other embodiments, the second organic emission layer OL 2 may include an organic material for emitting red, green, or white light, and in this case, the second organic emission layer OL 2 emits red light, green light, or white light.

The third organic emission layer OL 3 is disposed on each of the third electrodes E 3 corresponding to one of the third openings OM 1 . In the OLED display of FIG. 1 , the third organic emission layer OL 3 includes an organic material for emitting red light and thus, emits red light. In other embodiments, the third organic emission layer OL 3 may include an organic material for emitting blue, green, or white light, and in this case, the third organic emission layer OL 3 emits blue light, green light, or white light.

Thus, in the OLED display of FIG. 1 , the first organic emission layer OL 1 , the second organic emission layer OL 2 , and the third organic emission layer OL 3 respectively emit light of different colors (green, blue, and red, respectively). In other embodiments, the first organic emission layer OL 1 , the second organic emission layer OL 2 , and the third organic emission layer OL 3 may emit light of the same color (such as white).

The first spacer SP 1 is disposed between the first vertex P 1 and the third vertex P 3 corresponding to the first side V 1 among the four sides of the virtual square VS. The first spacer SP 1 is disposed as an island between the corresponding second opening OM 2 and third opening OM 3 , and has a first center C 1 , which is the center of the first spacer SP 1 , that coincides with the first side V 1 . The first spacer SP 1 is formed in the shape of a rectangle having long sides bisected by the first side V 1 through the first center C 1 .

The second spacer SP 2 is disposed between the third vertex P 3 and the second vertex P 2 corresponding to the second side V 2 among the four sides of the virtual square VS. The second spacer SP 2 is disposed as an island between the corresponding third opening OM 3 and second opening OM 2 , and has a second center C 2 , which is the center of the second spacer SP 2 , that coincides with the second side V 2 of the second center C 2 . The second spacer SP 2 is formed in the shape of a rectangle having long sides bisected by the second side V 2 through the second center C 2 .

The third spacer SP 3 is disposed between the second vertex P 2 and the fourth vertex P 4 corresponding to the third side V 3 among the four sides of the virtual square VS. The third spacer SP 3 is disposed as an island between the corresponding second opening OM 2 and third opening OM 3 , and has a third center C 3 , which is the center of the third spacer SP 3 , that coincides with the third side V 3 . The third spacer SP 3 is formed in the shape of a rectangle having long sides bisected by the third side V 3 through the third center C 3 .

The fourth spacer SP 4 is disposed between the fourth vertex P 4 and the first vertex P 1 corresponding to the fourth side V 4 among the four sides of the virtual square VS. The fourth spacer SP 4 is disposed as an island between the corresponding third opening OM 3 and second opening OM 2 , and has a fourth center C 4 , which is the center of the fourth spacer SP 4 , that coincides with the fourth side V 4 . The fourth spacer SP 4 is formed in the shape of a rectangle having long sides bisected by the fourth side V 4 through the fourth center C 4 .

As described, the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 are respectively disposed as islands corresponding to the four sides, that is, the first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 of the virtual square VS, and are also formed in the shape of rectangles respectively having long sides bisected respectively by the first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 through the first center C 1 ; the second center C 2 , the third center C 3 , and the fourth center C 4 , so that the area ratio occupied by the first spacers SP 1 , the second spacers SP 2 , the third spacers SP 3 , and the fourth spacers SP 4 in the entire area of the OLED display 1000 can be increased without interfering with the distances respectively set between the first openings OM 1 , the second openings OM 2 , and the third openings OM 3 .

The first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 may be formed of the same or different material of the pixel defining layer PDL, and may include at least one of an organic material, an inorganic material, a metal, glass, or the like.

As described, within each virtual square VS, the centers C 1 , C 2 , C 3 , and C 4 of each of the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 that neighbor the center point CP of the virtual square VS coincide with a respective one of the first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 so that distances between the respective centers C 1 , C 2 , C 3 , and C 4 of the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 , and the center point CP of the virtual square VS have the same length D.

In FIG. 1 , the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 have rectangular shapes, but in other embodiments, they may have other polygonal shapes such as triangles, other quadrilaterals, pentagons, hexagons, heptagons, octagons, nonagons, or the like, or closed loop shapes formed by extension of a curved line.

The common electrode CE is disposed on the first organic emission layers OL 1 , the second organic emission layers OL 2 , and the third organic emission layers OL 3 throughout the entire surface of the first substrate SU 1 , and may be a cathode functioning as an electron injection electrode, or an anode. The common electrode CE may be formed as a light transmissive electrode or a light reflective electrode.

In FIG. 2 , the common electrode CE is disposed on the first spacer SP 1 . In another embodiment of the present invention, the common electrode CE may be disposed between the pixel defining layer PDL and the first spacer SP 1 .

The second substrate SU 2 is formed of an insulating substrate made of glass, quartz, ceramic, metal, plastic, or the like. In addition, when the second substrate SU 2 and the first substrate SU 1 are made of plastic, the OLED display may have a flexible, stretchable, or rollable characteristic.

As described above, in the OLED display 1000 , within each virtual square VS, gaps of the first length L 1 are formed between the first opening OM 1 and each of the second openings OM 2 , and between the first opening OM 1 and each of the third openings OM 3 . In addition, between neighboring virtual squares VS, gaps of the third length L 3 that are longer than the first length L 1 are formed between the neighboring first openings OM 1 so that deposition reliability in a deposition process that uses fine metal masks that form the green organic emission layer, the blue organic emission layer, and the red organic emission layer respectively included in the first opening OM 1 , the second opening OM 2 , and the third opening OM 3 can be improved. That is, deposition reliability of the OLED display 1000 can be improved.

In addition, in the OLED display 1000 , within and around each virtual square VS, the second openings OM 2 and the third openings OM 3 are alternately arranged to surround the first opening OM 1 so that an aperture ratio of each of the first opening OM 1 , the second openings OM 2 , and the third openings OM 3 can be improved. Accordingly, manufacturing time and manufacturing cost of the OLED display can be reduced and quality of an image displayed by the OLED display can be improved. That is, image quality of the OLED display 1000 can be improved.

Further, in the OLED display 1000 , the second openings OM 2 for emitting blue light have corresponding second organic emission layers OL 2 that have a shorter life span compared to those of other color pixels. Accordingly, each second opening OM 2 has a larger area compared to those of the first opening OM 1 and the third opening OM 3 so that deterioration of the life span of the whole OLED display can be suppressed. That is, the life span of the OLED display 1000 can be improved.

As described above, in the OLED display 1000 , the first opening OM 1 , the second opening OM 2 , and the third opening OM 3 have polygonal shapes such as an octagon, a hexagon, a quadrilateral, or the like. Within or around each virtual square VS, the center of the first opening OM 1 coincides with the center point CP of the virtual square VS, the centers of the second openings OM 2 respectively coincide with the first vertex P 1 and the second vertex P 2 , and the centers of the third openings OM 3 respectively coincide with the third vertex P 3 and the fourth vertex P 4 to improve deposition reliability of the organic emission layer and also improve an aperture ratio of each of the first, second, and third openings OM 1 , OM 2 , and OM 3 during the deposition process using the fine metal masks in consideration of a deposition process of the organic emission layer, which is another manufacturing feature of the OLED display 1000 .

That is, the OLED display 1000 including the octagon-shaped first, hexagon-shaped second, and quadrilateral-shaped third openings OM 1 , OM 2 , and OM 3 can be provided, and, in the OLED display 1000 , deposition reliability of the organic emission layers can be improved, the life span of the organic emission layers can be improved, and the aperture ratio of each of the first openings OM 1 , the second openings OM 2 , and the third openings OM 3 can be improved.

Further, in the OLED display 1000 , within and around each virtual square VS, the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 are disposed as islands respectively corresponding to the first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 in consideration of the shapes of the first, second, and third openings OM 1 , OM 2 , and OM 3 such that the first, second, third, and fourth spacers SP 1 , SP 2 , SP 3 , and SP 4 of which centers have the same distance D to the center point CP to which the center of the first opening OM 1 coincides. Thus, the first, second, third, and fourth spacers SP 1 , SP 2 , SP 3 , and SP 4 do not interfere with distances set between the first, second, and third openings OM 1 , OM 2 , and OM 3 and also maintain a consistent ratio of the area occupied by the first, second, third, and fourth spacers SP 1 , SP 2 , SP 3 , and SP 4 when the entire area of the OLED display 1000 is increased. Accordingly, interference of the second substrate SU 2 with respect to the first organic emission layers OL 1 , the second organic emission layers OL 2 , and the third organic emission layers OL 3 can be reduced or minimized, regardless of how many virtual squares VS make up the OLED display 1000 .

As described, the OLED display 1000 includes the octagonal-shaped first opening OM 1 , the hexagonal-shaped second opening OM 2 , and the quadrilateral-shaped third opening OM 3 in consideration of improvement of deposition reliability of the organic emission layers, improvement of life span of the organic emission layers, and improvement of the aperture ratio of each of the first, second, and third openings OM 1 , OM 2 , and OM 3 , and also includes the first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 in consideration of the shapes of the first opening OM 1 , the second opening OM 2 , and the third opening OM 3 so that the deposition reliability and life span of the organic emission layers can be improved, the aperture ratio of each of the first, second, and third openings OM 1 , OM 2 , and OM 3 can be improved, and the entire mechanical reliability can be improved.

Hereinafter, an OLED display 1002 according to a second embodiment of the present invention will be described with reference to FIG. 3 . For convenience of description, only features distinguished from those of the first embodiment above may be extracted and described, and portions for which the description is omitted follow the first embodiment. In addition, the same constituent elements of both embodiments will be described by using the same reference numerals as the first embodiment.

FIG. 3 partially shows a plane surface of the OLED display 1002 . As shown in FIG. 3 , an OLED display 1002 includes a first spacer SP 1 , a second spacer SP 2 , a third spacer SP 3 , and a fourth spacer SP 4 , and they are respectively formed in the shape of a square.

The first spacer SP 1 , the second spacer SP 2 , the third spacer SP 3 , and the fourth spacer SP 4 are respectively disposed as islands on a pixel defining layer PDL corresponding to four sides, namely a first side V 1 , a second side V 2 , a third side V 3 , and a fourth side V 4 , of a virtual square VS. In addition, the centers of the first to fourth spacers SP 1 to SP 4 respectively coincide with the first side V 1 , the second side V 2 , the third side V 3 , and the fourth side V 4 .

As described, the OLED display 1002 includes a first opening OM 1 , a second opening OM 2 , and a third opening OM 3 respectively formed in the shape of an octagon, a hexagon, and a quadrilateral in consideration of improvement in deposition reliability of organic emission layers, improvement in life span of the organic emission layers, and improvement in aperture ratios of the first, second, and third openings OM 1 , OM 2 , and OM 3 , and also includes a first spacer SP 1 , a second spacer SP 2 , a third spacer SP 3 , and a fourth spacer SP 4 in consideration of the shapes of the first, second, and third openings OM 1 , OM 2 , and OM 3 such that the deposition reliability of the organic emission layers can be improved, the life span of the organic emission layers can be improved, and the entire mechanical reliability of the OLED display 1002 can be improved.

While the present invention has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, and their equivalents.