Organic light emitting diode pixel driving circuit, display panel and display device

The present application claims priority of Chinese patent application No. 201510669554.5 filed on Oct. 13, 2015 and entitled “Organic Light Emitting Diode Pixel Driving Circuit, Display Panel and Display Device”, the content of which is incorporated herein by reference in its entirety.

The present disclosure relates to the field of display technologies, in particular to an organic light emitting diode pixel driving circuit, a display panel and a display device.

An organic light emitting diode display module (AMOLED) is one of the hotspots within the field of flat panel display device researches. Compared to a liquid crystal display module, the organic light emitting diode display module has advantages such as low power consumption, a low production cost, self-luminous and wide viewing angle and fast response. At present, the organic light emitting diode display module has begun to replace conventional liquid crystal display module in the display area such as mobile phones, tablets and digital camera. Pixel driving circuit design is the core technology of the organic light emitting diode display module and has important research significance.

The organic light emitting diode display module can be classified into two types based on driving mode: a passive matrix organic light emitting diode (PMOLED) display module and an active matrix organic light emitting diode (AMOLED) display module, namely a direct addressing and a thin film transistor (TFT) matrix addressing. The active matrix organic light emitting diode display module, which has pixels arranged in an array form and high luminous efficacy, is of an active display type and commonly used as large-size high-definition display device. Unlike the liquid crystal display module using stable voltage to control brightness, the active matrix organic light emitting diode display module is driven by the current and need the stable current to control the light emitting thereof. Due to process technology and modular member deterioration and other reasons, the threshold voltage (Vth) of driving transistors of each pixel drifts, so that the current flowing through each pixel varies as the threshold voltage, thereby leading to the uneven display luminance. Meanwhile, IR-drop, caused by resistance of power supply lines connecting various pixels on the panel and the electric charges consumed by various pixels when emitting light, can also arouse the display unevenness, so that the pixels in proximity to the display pixel drive module are brighter while those away from the display pixel drive module are darker (that is, the pixels are getting dark with the distant from the display pixel drive module), thereby affecting the display effect of the entire image. Therefore, there is a need for the pixel driving circuit being capable of compensating the threshold voltage drift of the driving transistor and IR-drop of the supply power.

In view of this, for solving the uneven display of the organic light emitting diode display device in the prior art due to the process technology, the modular member deterioration and IR-drop and other reason, embodiments of the present disclosure are to provide a pixel driving circuit being capable of compensating the threshold voltage drift of the drive thin film transistor and IR-drop of the supply power.

For this, the present disclosure is to provide an organic light emitting diode pixel driving circuit including:

a pixel capacitor including a first electrode and a second electrode, which is configured for storing received voltage and coupling a change valve of a voltage at the first electrode to the second electrode; a driving transistor, for generating a driving current based on a power supply voltage and the voltage at the second electrode of the pixel capacitor;

a first transistor, for providing a reference voltage to the first electrode of the pixel capacitor under the control of a first light emitting signal;

a second transistor, for transmitting a high-level power supply voltage to the first electrode of the pixel capacitor under the control of a second light emitting signal;

a third transistor and a fourth transistor, both for transmitting a difference between a data voltage and a threshold voltage of the driving transistor to the second electrode of the pixel capacitor under the control of a first scanning signal; and

an organic light emitting diode, which emits light under the control of the driving current generated by the driving transistor.

The present disclosure is further to provide a display panel, including the organic light emitting diode pixel driving circuit described above.

The present disclosure is further to provide a display device, including the organic light emitting diode pixel driving circuit described above.

Compared to the prior art, the organic light emitting diode pixel driving circuit, the display panel and the display device provided by the present disclosure are capable of compensating the effects of the threshold voltage drift of the drive thin film transistor and IR-drop of the supply power on the image display, solving the uneven display of the organic light emitting diode display device in the prior art due to the process technology, the modular member deterioration and IR-drop and other reason.

The accompanying drawings are included to provide a further understanding of the present disclosure, which are incorporated in and constitute a part of the disclosure. The accompanying drawings illustrate embodiments of the disclosure, and are used for explaining the principles of the disclosure in conjunction with the description.

FIG. 1 schematically shows the composition of an organic light emitting diode display panel of an embodiment of the present disclosure;

FIG. 2 is an equivalent circuit diagram schematically showing an organic light emitting diode pixel driving circuit within each pixel unit in FIG. 1 ; and

FIG. 3 is a sequence diagram providing the equivalent circuit as shown in FIG. 2 with a control signal.

Embodiments of the present disclosure are below described in detail according to the accompanying drawings. Further, the present disclosure is not limited to the following embodiments.

As shown FIG. 1 , an organic light emitting diode display panel according to an embodiment of the present disclosure includes an array substrate 10 , a timing control module, a scan driving module and a data driving module.

The array substrate 10 includes a plurality of pixel units 11 arranged in a matrix, the pixel units 11 emit light based on the corresponding scanning signals provided by a plurality of scanning lines GL 1 ( 1 ) to GL 1 (n) and GL 2 ( 1 ) to the GL 2 (n) from the scan driving module and the corresponding data voltage provided by a plurality of data lines DL( 1 ) to DL(m) from the data driving module. To this end, an organic light emitting diode pixel driving circuit within one pixel unit 11 includes an organic light emitting diode OLED and a plurality of transistors and a capacitor module for driving the organic light emitting diode OLED to emit light. The specific configuration of each pixel unit 11 will be described below with reference to FIG. 2 .

The timing control module receives a vertical synchronizing signal Vsync from the outside, a horizontal synchronization signal Hsync, a data enable signal DE, a clock signal CLK and a video signal (not shown). Further, the timing control module arranges the video signal externally inputted into digital image data in units of frames. For example, the timing control module controls the operation timing of each of the scan driving module and the data driving module using the timing signals including the vertical synchronizing signal Vsync, the horizontal synchronization signal Hsync, the data enable signal DE and the clock signal CLK. To this end, the timing control module generates a strobe control signal GCS for controlling the operation timing of the scan driving module, and a data control signal DCS for controlling the operation timing of the data driving module.

The scan driving module generates a first scanning signalScan 1 , a second scanning signalScan 2 , a first light emitting signal XE and a second light emitting signal EMIT, such that the transistor in each pixel unit 11 included in the array substrate 10 can be operated based on the strobe control signal GCS provided by the timing control module, and the first scanning signalScan 1 and the second scanning signal Scan 2 are supplied to the array substrate 10 by the scanning lines GL 1 , GL 2 , the first and second light emitting signals XE and EMIT are supplied to the array substrate 10 by a first light emitting signal transmission line XEL (n) and a second light emitting signal transmission line EML (n).

The data driving module generates a data signal using the digital image data and the data control signals DCS provided by the timing control module, and provides the generated data voltage Vdata to the array substrate 10 by the corresponding data line DL.

In an implementation, the data driving module further includes a power module for generating a high-level power supply voltage Vdd, a low-level power supply voltage Vee and a reference voltage Vref. The high-level power supply voltage Vdd is supplied to the array substrate 10 via a high-level power supply voltage transmission line PL (m), the low-level power supply voltage Vee is supplied to the cathode of the organic light emitting diode OLED on the array substrate 10 via a low-level power supply voltage transmission line EL, the reference voltage Vref is supplied to the array substrate 10 via a reference voltage transmission line CPL (ref).

The specific configuration of the organic light emitting diode pixel driving circuit within each pixel will be below described with reference to FIGS. 1 and 2 .

FIG. 2 is an equivalent circuit diagram schematically showing an organic light emitting diode pixel driving circuit within each pixel unit in FIG. 1 . As shown in FIG. 2 , the organic light emitting diode pixel driving circuit within each pixel unit 11 may include a first transistor T 1 , a second transistor T 2 , a third transistor T 3 , a fourth transistor T 4 , a fifth transistor T 5 , a sixth transistor T 6 , a seventh transistor T 7 , a driving transistor Tdr, a pixel capacitor Cst, and an organic light emitting diode OLED.

Each of the first transistor T 1 to the seventh transistor T 7 and the driving transistor Tdr as shown in FIG. 2 is a PMOS transistor, but are not limited thereto. As another embodiment, NMOS transistors may be applied to said transistors. For example, one or more of the first transistor T 1 to the seventh transistor T 7 and the driving transistor Tdr are an NMOS transistor. In this case, the voltage for turning on the NMOS transistor has the opposite polarity to the voltage for turning on the PMOS transistor.

In an implementation, a first electrode of the first transistor T 1 receives a reference voltage Vref, a second electrode of the first transistor is connected to a first electrode of a pixel capacitor Cst, i.e., a first node N 1 , and a gate electrode of the first transistor T 1 receives a first light emitting signal XE, for transmitting the reference voltage to the first electrode of the pixel capacitor Cst (i.e., the first node N 1 ) under the control of the first light emitting signal XE.

A first electrode of the second transistor T 2 receives a high-level power supply voltage Vdd, a second electrode of the second transistor T 2 is connected to the first electrode of the pixel capacitor Cst, i.e., the first node N 1 , and a gate electrode of the second transistor T 2 receives a second light emitting signal EMIT, for transmitting the high-level power supply voltage Vdd to the first electrode of the pixel capacitor Cst (i.e., the first node N 1 ) under the control of the second light emitting signal XE.

A first electrode of the third transistor T 3 receives a data voltage Vdata, a second electrode of the third transistor T 3 is connected to a first electrode of the driving transistor Tdr and a second electrode of the sixth transistor T 6 , and a gate electrode of the third transistor T 3 receives the first scanning signal Scan 1 , for transmitting the data voltage Vdata to first electrode of the driving transistor Tdr (i.e., a third node N 3 ) under the control of the first scanning signal Scan 1 .

A second electrode of the fourth transistor T 4 is connected to the gate electrode of the driving transistor Tdr, a first electrode of the fourth transistor T 4 is connected to a second electrode of the driving transistor Tdr, a gate electrode of the fourth transistor T 4 receives the first scanning signal Scan 1 , for connecting the second electrode of the driving transistor Tdr to the gate electrode of the driving transistor Tdr under the control the first scanning signal Scan 1 , reading the difference between the data voltage Vdata and a threshold voltage |Vth| of the driving transistor Tdr, and transmitting it to a second electrode of the pixel capacitor Cst, i.e., a second node N 2 .

A first electrode and a gate electrode of the fifth transistor T 5 receives a second scanning signal Scan 2 simultaneously, and a second electrode of the fifth transistor T 5 is connected to the second electrode of the pixel capacitor Cst, for resetting the voltage at the gate electrode of the driving transistor Tdr under the control of the second scanning signal Scan 2 .

A first electrode of the sixth transistor T 6 receives the high-level supply voltage Vdd, the second electrode of the sixth transistor T 6 is connected to the first electrode of the driving transistor Tdr, and a gate electrode of the sixth transistor T 6 receives the second light emitting signal EMIT, for transmitting the high-level power supply voltage Vdd received by the sixth transistor T 6 to the first electrode of the driving transistor Tdr under the control of the second light emitting signal EMIT.

A first electrode of the seventh transistor T 7 is connected to the second electrode of the driving transistor Tdr, a second electrode of the seventh transistor T 7 is connected to an anode of the organic light emitting diode OLED, a gate electrode of the seventh transistor T 7 receives the second light emitting signal EMIT, for transmitting a driving current I generated by the driving transistor Tdr to the organic light emitting diode OLED under the control of the second light emitting signal EMIT.

The anode of the organic light emitting diode OLED receives the driving current I generated by the driving transistor Tdr under the control of the seventh transistor T 7 , a cathode of the organic light emitting diode OLED receives a low-level signal Vee and emits light with the action of the drive current I.

In the implementation, each of the first transistor T 1 to the seventh transistor T 7 and the driving transistor Tdr is the PMOS transistor, the first and second scanning signals Scan 1 and Scan 2 are the low-level signal, and the reference voltage Vref is the ideal high-level power voltage Vdd.

FIG. 3 is a sequence diagram of the driving circuit within each pixel unit in the first embodiment and shows a specific working principle. See also FIGS. 2 and 3 . The working process of the driving circuit within each pixel unit is divided into gate electrode reset stage of the driving transistor Tdr, the threshold voltage compensation stage of the driving transistor Tdr, the light emitting stage of the organic light emitting diode OLED.

The first stage is a gate electrode reset stage of the driving transistor Tdr. At this point, the first light emitting signal XE and the second scanning signalScan 2 are low-level signals, the first scanning signalScan 1 and the second light emitting signal EMIT are high-level signals, the first transistor T 1 and the fifth transistor T 5 are turned on, and the second transistor T 2 , the third transistor T 3 , the fourth transistor T 4 , the sixth transistor T 6 and the seventh transistor T 7 are cut off.

The first transistor T 1 is turned on, the reference voltage Vref received by the first transistor T 1 is transmitted to the first electrode of the pixel capacitor Cst, i.e., the first node N. In the implementation, the potential of the reference voltage Vref is set as the ideal high-level power supply voltage Vdd, i.e., the high-level power supply voltage Vdd without any current consumption. The high-level power supply voltage Vdd actually inputted to the driving circuit of the various pixel units 11 are different from each other due to the resistance in the high-level power supply transmission lines PL (m), that is, the high-level power supply voltage Vdd actually inputted to the driving circuit of the various pixel units 11 have a certain voltage drop with respect to the ideal high-level power supply voltage Vdd.

Assuming that the voltage drop is ΔVdd when the high-level power supply Vdd reaches the driving circuit of the pixel unit as shown in FIG. 2 , namely: ΔVdd=Vref−Vdd, where Vdd is a practical high-level power supply voltage after generating the voltage drop. Since the reference voltage Vref has no current consumption on the reference voltage transmission line CPL, the voltage valve thereof may always be maintained to be Vref such that the first electrode of the pixel capacitor Cst (i.e., the first node N 1 ) is maintained to be the ideal voltage: Vref=(Vdd+ΔVdd).

Meanwhile, the second scanning signal Scan 2 is the low-level signal, the fifth transistor T 5 is turned on, and the second electrode of the pixel capacitor Cst (i.e., the second node N 2 ) receives the second scanning signal Scan 2 to reduce the voltage at the second node N 2 by receiving the low-level second scanning signal Scan 2 , thus resetting the potential at the gate electrode of the driving transistor Tdr.

The second stage is a threshold voltage compensation stage of the driving transistor Tdr. At this point, the first scanning signal Scant and the first light emitting signal XE are the low-level signals, the second scanning signal Scan 2 and the second light emitting signal EMIT are the high-level signals, and the first transistor T 1 is maintained to be in the on-state, the third transistor T 3 and the fourth transistor T 4 are turned on while the second transistor T 2 , the fifth transistor T 5 to seventh transistor T 7 is maintained to be in the off-state.

Since the first transistor T 1 remains to be in the on-state, no matter how the voltage at the second electrode of the pixel capacitor Cst (i.e., the second node N 2 ) changes, the voltage at the first electrode of the pixel capacitor Cst (i.e., the first node N 1 ) does not change accordingly, and is maintained to be the reference voltage Vref, and Vref=(Vdd+ΔVdd).

Since the third transistor T 3 is turned on while the sixth transistor T 6 is cut off, the first electrode of the driving transistor Tdr receives the data voltage Vdata, such that the voltage at the first electrode of the driving transistor Tdr, that is, Vs=Vdata. Since the fourth transistor T 4 is turned on, the driving transistor Tdr is deemed to be equivalent to a diode connection structure, that is, the gate electrode of the driving transistor Tdr is connected with the second electrode of the driving transistor Tdr. The fourth transistor T 4 reads the difference between the data voltage Vdata and the threshold voltage |Vth| of the driving transistor Tdr, and transmits the same to the second electrode of the pixel capacitor Cst, i.e., the second node N 2 or the gate electrode of the driving transistor Tdr. Accordingly, when the voltage Vs at the first electrode of the driving transistor Tdr is Vdata, the voltage Vg at the gate electrode of the driving transistor Tdr is (Vdata−|Vth|). Likewise, the voltage at the second electrode of the driving transistor Tdr is (Vdata−|Vth|), where, |Vth| of the driving transistor Tdr threshold voltage.

Thus, the voltage at the second electrode of the pixel capacitor Cst (i.e. the second node N 2 ) is (Vdata−|Vth|).

Further, the voltage difference between the first electrode of the pixel capacitor Cst and the second electrode of the pixel capacitor Cst is: (Vdd+ΔVdd)−(Vdata−|Vth|).

The third stage t 3 is the light emitting stage of the organic light emitting diode OLED. At this point, the first scanning signal Scant, the second scanning signal Scan 2 and the first light emitting signal XE are the high-level signal, the second light emitting signal is low-level signal EMIT, the first transistor T 1 , the third transistor T 3 , the fourth transistor T 4 and the fifth transistor T 5 are cut off, and the second transistor T 2 , the sixth transistor T 6 and the seventh transistor T 7 are turned on.

Since the second transistor T 2 is turned on while the first transistor T 1 is cut off, the first electrode of the pixel capacitor Cst which receives originally the reference voltage Vref is turned into receive the high-level power supply voltage Vdd, such that the voltage at the first electrode of the pixel capacitor Cst (i.e. the first node N 1 ) is changed from the reference voltage Vref (the ideal high-level power supply voltage) to the actual high-level power supply voltage Vdd, while the voltage difference between the reference voltage Vref and the actual high-level power supply voltage Vdd, i.e., the voltage drop ΔVdd of the high-level power supply voltage Vdd resulted from the resistance in the high-level power supply line PL is coupled to the second electrode of the pixel capacitor Cst through the first electrode of the pixel capacitor Cst, and is applied to the gate electrode of the driving transistor Tdr.

Since the voltage at the second electrode of the pixel capacitor Cst is the voltage at the gate electrode of the driving transistor Tdr, the voltage at the gate electrode of the driving transistor Tdr is now taken as Vg, the voltage at the first electrode of the pixel electrode capacitor Cst is the actual high-level power supply voltage Vdd, and the voltage at the second electrode of the pixel capacitor Cst is the voltage at the gate electrode of the driving transistor Tdr Vg.

According to the principle of the capacitor, after entering the third stage t 3 from the second stage t 2 , the voltage difference between the first electrode and the second pixel of the pixel capacitor Cst will remain unchanged. As described above, at the second stage, the voltage at the first electrode of the pixel capacitor Cst is (Vdd+ΔVdd), and the voltage at the second electrode of the pixel capacitor Cst is (Vdata−|Vth|); at the third stage, the voltage at the first electrode of the pixel capacitor Cst is the actual high-level power supply voltage Vdd, and the voltage at the second electrode of the pixel capacitor Cst equals to the voltage at the gate electrode of the driving transistor Tdr.

Therefore, (Vdd+ΔVdd)−(Vdata−|Vth|)=Vdd−Vg.

Accordingly, Vg=Vdd−(Vdd+ΔVdd)+(Vdata−|Vth|)=−ΔVdd+(Vdata−|Vth|). That is, the voltage Vg at the gate electrode of the driving transistor is “−ΔVdd+(Vdata−|Vth|).”

Since the second light emitting signal EMIT is low level, the second scanning signal Scan 2 is high level, the sixth transistor T 6 is turned on and the third transistor T 3 is cut off, such that the voltage Vs at the first electrode of the driving transistor Tdr is turned into Vdd from Vdata, that is, Vs=Vdd; in this case, the gate voltage difference Vsg between the voltage Vs at the first electrode of the driving transistor Tdr and the voltage Vg at the gate electrode of the driving transistor Tdr is: Vsg=Vs−Vg=Vdd+ΔVdd−(Vdata−|Vth|).

Therefore, it can be seen from the current characteristic equation of the transistor operation in the saturation region that the driving current outputted by the driving transistor Tdr is: I=K (Vsg−|Vth|)^2=K (Vdd+ΔVdd−Vdata)^2=K (Vref−Vdata)^2

Since the second light emitting signal EMIT is low level and the seventh transistor T 7 is turned on, the driving current I outputted by the driving transistor Tdr is capable of driving the organic light emitting diode OLED to emit light. Where, Vg is the voltage at the gate electrode of the driving transistor Tdr, and Vs is the voltage at the first electrode of the driving transistor Tdr.

It can be seen from the above equation of the driving current that the driving current I outputted by the driving transistor Tdr is irrelevant to the threshold voltage of the driving transistor Tdr and the high-level power supply voltage Vdd driving the organic light emitting diode OLED to emit light, thereby overcoming the uneven display of the entire image which is caused by the drift of the threshold voltage |Vth| of the driving transistor Tdr and the different driving current driving the different OLEDs to emit light when the different OLEDs receive the same image data signal, the different driving current is caused by the difference of the high-level power supply voltages Vdd actually received between the driving circuit of the various pixel units resulted from the resistance in the high-level power supply transmission lines PL (m).

In addition, the driving transistor Tdr may adjust the current amount flowing through the organic light emitting diode OLED based on the voltage provided by the data voltage Vdata to the second node N 2 connected to the gate electrode of the driving transistor. For example, the organic light emitting diode OLED emits light, and when the voltage, which is the threshold voltage |Vth| of the driving transistor higher than the data signal Vdata, is supplied to the second node N 2 , the current amount flowing through the organic light emitting diode OLED is proportional to the level of the data voltage Vdata. Therefore, the OLED display device according to the implementation of the present invention may provide the data voltages with the different levels to sub-pixels SP, respectively, to display different gray levels, thereby displaying the image.

The organic light emitting diode pixel driving circuit according to the implementation of the present invention may compensate the changes of the current flowing through the organic light emitting diode OLED resulted from the deviation of the threshold voltage |Vth| of the driving transistor Tdr and the voltage drop of the high-level power supply voltage Vdd. Moreover, based on the reference voltage Vref and the data voltage Vdata, the driving current of the driving transistor Tdr for driving the organic light emitting diode OLED to emit light is irrelevant to the deviation of the threshold voltage |Vth| and the voltage drop of the high-level power supply voltage Vdd, thereby maintaining the driving current to be a good constant current, further solving the drift of the threshold voltage |Vth| of the driving transistor Tdr and the uneven display of the entire image, which is caused by the different driving current driving the different OLEDs when the different OLEDs receive the same image data signal, the different OLEDs are caused by the difference the high-level power supply voltages Vdd actually received between the driving circuit of the various pixel units resulted from the resistance in the high-level power supply transmission lines PL (m).

The first electrode of the transistors (the first transistor to the seventh transistor and the driver transistor) mentioned in the embodiment of the present disclosure may be a source electrode (or a drain electrode) of the transistor, and the second electrode of the transistor may be the drain electrode of the transistor (or the source electrode, which may be determined depending on the type of the transistor). If the source electrode of the transistor is the first electrode, the drain electrode of the second transistor is the second electrode; if the drain electrode of the transistor is the first electrode, the source electrode of the transistor is the second electrode. Refer to the foregoing with respect to the specific operation mode, it is not described herein.

In the organic light emitting diode pixel driving circuit provided in the embodiment of the present disclosure, the first transistor is capable of storing the reference voltage in the first electrode of the pixel capacitor under the control of the first light emitting signal; and the fourth transistor is capable of connecting the gate electrode of the driving transistor to the drain electrode of the driving transistor under the control of the first scanning signal to read the different between the data voltage and the threshold voltage of the driving transistor and store it in the second electrode of the pixel capacitor. Therefore, during the driving transistor generates the driving current based on the power supply voltage and the voltage at the second electrode of the pixel capacitor, the influences of the power supply voltage and the threshold voltage of the driving transistor are eliminated, such that the generated driving current is irrelevant to the power supply voltage and the threshold voltage of the driving transistor, thereby overcoming the uneven display of the entire image which is caused by the drift of the threshold voltage |Vth| of the driving transistor Tdr and the different driving current driving the different OLEDs to emit light when the different OLEDs receive the same image data signal, the different driving current is caused by the difference of the high-level power supply voltages Vdd actually received between the driving circuit of the various pixel units resulted from the resistance in the high-level power supply transmission lines PL (m).

The embodiment of the present disclosure also provides a display panel including an organic light emitting diode pixel driving circuit provided by the embodiment of the disclosure. Since the first transistor in the organic light emitting diode pixel driving circuit of the display panel is capable of storing the reference voltage in the first electrode of pixel capacitor under the control of the first light emitting signal; and the fourth transistor is capable of connecting the gate electrode of the driving transistor to the drain electrode of the driving transistor under the control of the first scanning signal to read the different between the data voltage and the threshold voltage of the driving transistor and store it in the second electrode of the pixel capacitor. Therefore, during the driving transistor generates the driving current based on the power supply voltage and the voltage at the second electrode of the pixel capacitor, the influences of the power supply voltage and the threshold voltage of the driving transistor are eliminated, such that the generated driving current is irrelevant to the power supply voltage and the threshold voltage of the driving transistor, thereby overcoming the uneven display of the entire image which is caused by the drift of the threshold voltage |Vth| of the driving transistor Tdr and the different driving current driving the different OLEDs to emit light when the different OLEDs receive the same image data signal, the different driving current is caused by the difference of the high-level power supply voltages Vdd actually received between the driving circuit of the various pixel units resulted from the resistance in the high-level power supply transmission lines PL (m).

The embodiment of the present disclosure also provides a display device including an organic light emitting diode pixel driving circuit provided by the embodiment of the disclosure and the display panel provided by the above embodiment. Since the first transistor in the organic light emitting diode pixel driving circuit of the display panel is capable of storing the reference voltage in the first electrode of pixel capacitor under the control of the first light emitting signal; and the fourth transistor is capable of connecting the gate electrode of the driving transistor to the drain electrode of the driving transistor under the control of the first scanning signal to read the different between the data voltage and the threshold voltage of the driving transistor and store it in the second electrode of the pixel capacitor. Therefore, during the driving transistor generates the driving current based on the power supply voltage and the voltage at the second electrode of the pixel capacitor, the influences of the power supply voltage and the threshold voltage of the driving transistor are eliminated, such that the generated driving current is irrelevant to the power supply voltage and the threshold voltage of the driving transistor, thereby overcoming the uneven display of the entire image which is caused by the drift of the threshold voltage |Vth| of the driving transistor Tdr and the different driving current driving the different OLEDs to emit light when the different OLEDs receive the same image data signal, the different driving current is caused by the difference of the high-level power supply voltages Vdd actually received between the driving circuit of the various pixel units resulted from the resistance in the high-level power supply transmission lines PL (m).

It should be noted that those skilled in the art can understand the drawings are merely the schematic diagrams of one preferred embodiment, the modules or the processes in the drawings are not necessary to implement the present disclosure.

It should be understood for those skilled in the art that the modules in the devices of the embodiment may be disposed in the devices of the embodiment according to the description of the embodiment, or may be altered to be disposed in one or more devices different from that of the present embodiment. The modules in the above embodiment may be combined into one, or may be further split into a plurality of submodules.

The organic light emitting diode pixel driving circuit, the display panel and the display device provided by the present disclosure has been described in detail above. The principle and the implementation mode of the present disclosure are described using the specific examples. The description of the above embodiments is merely used for understanding the method and the core concept of the present disclosure. The various alternations and modifications may be made out for common persons skilled in the art without departing from the spirit or the protection scope of the present disclosure. Therefore, the present disclosure is intended to cover the alternations and modifications of the present disclosure falling within the scope of the appended claims and the equivalents thereof.