The disclosure is a US National Stage of International Application No. PCT/CN2020/120484, filed on Oct. 12, 2020, which claims priority to patent application No. PCT/CN2020/118657, filed on Sep. 29, 2020, and entitled “Display Panel, Driving Method of Pixel Circuit Therein, and Display Device”, which is hereby incorporated by reference in its entirety.
The disclosure relates to the field of display technology, particularly to a pixel driving circuit, a driving method thereof, a display substrate and a display device.
With rapid development of display technology, more requirements are proposed for shape of display devices in addition to the traditional function of information display and the like. Increasing screen-to-body ratio is a trend of the market, and therefore display devices with an under-panel camera are highly favored by consumers.
In a display device with an under-panel camera, the camera is provided under the panel, and light can pass through the display panel to the camera to enable the camera to capture a picture. However, uneven brightness at low gray scale easily occurs in the panel part where the camera is located.
An embodiment of the disclosure provides a display substrate, including a display area and a bezel area, where
In some embodiments, in the embodiment of the disclosure, the first drive control circuit includes:
In some embodiments, in the embodiment of the disclosure, the first drive control sub-circuit includes a first switch transistor,
In some embodiments, in the embodiment of the disclosure, the first threshold compensation sub-circuit includes a second switch transistor,
In some embodiments, in the embodiment of the disclosure, the first light emission control sub-circuit includes a third switch transistor and a fourth switch transistor,
In some embodiments, in the embodiment of the disclosure, the first data writing sub-circuit includes a fifth switch transistor,
In some embodiments, in the embodiment of the disclosure, the first storage sub-circuit includes a first capacitor,
In some embodiments, in the embodiment of the disclosure, the first drive control circuit further includes a first reset sub-circuit and a second reset sub-circuit,
In some embodiments, in the embodiment of the disclosure, the first drive control circuit includes:
In some embodiments, in an embodiment of the disclosure, the first reset sub-circuit includes a sixth switch transistor,
In some embodiments, in an embodiment of the disclosure, the second reset sub-circuit includes a seventh switch transistor,
In some embodiments, in the embodiment of the disclosure, the second light emission control sub-circuit includes an eighth switch transistor,
In some embodiments, in the embodiment of the disclosure, the display substrate further includes a plurality of third drive control circuits correspondingly coupled to the first light-emitting devices, respectively, wherein
In some embodiments, in the embodiment of the disclosure, the third drive control circuit includes:
Correspondingly, an embodiment of the disclosure further provides a display device including any display substrate described above.
In some embodiments, in an embodiment provided in the disclosure, the display device further includes an image collector,
Correspondingly, an embodiment of the disclosure further provides a pixel driving circuit, which is configured to drive a second light-emitting device, the pixel driving circuit including:
Correspondingly, an embodiment of the disclosure further provides a driving method of the above-mentioned pixel driving circuit, the method including: in a first time period, controlling a first drive control circuit to generate a drive current for driving a corresponding second light-emitting device, and controlling the first drive control circuit to be disconnected from the corresponding second light-emitting device when the drive current moves between a second drive control circuit and a first wire; and
In some embodiments, in the embodiment of the disclosure, in a first time period, controlling a first drive control circuit to generate a drive current for driving a corresponding second light-emitting device, and controlling the first drive control circuit to be disconnected from the corresponding second light-emitting device when the drive current moves to a node between a second drive control circuit and a first wire includes:
In some embodiments, in the embodiment of the disclosure, an effective signal is applied to the first light emission control signal terminal after the effective signal applying to the second light emission control signal terminal is stopped.
In some embodiments, in the embodiment of the disclosure, in a second time period, controlling the first drive control circuit into conduction with the corresponding second light-emitting device includes:
Moreover, also referring to
Based on this, in view of the problem of uneven brightness in a second display area at low gray scale in a display device with an under-panel-camera in the related art, embodiments of the disclosure provide a pixel driving circuit, a driving method thereof, a display substrate, and a display device.
Specific implementations of the pixel driving circuit, the driving method thereof, the display substrate, and the display device provided in the embodiments of the disclosure will be described in detail below in conjunction with the accompanying drawings. The size and shape of each structure in the drawings do not reflect the true scale, and are merely intended to illustrate the disclosure.
An embodiment of the disclosure provides a display substrate.
The display area A includes a first display area A1 and a second display area A2; the first display area A1 includes a plurality of first light-emitting devices EL′; in
The display substrate includes a plurality of pixel driving circuits correspondingly coupled to the second light-emitting devices EL, respectively.
Each first drive control circuit 10 is configured to generate a drive current for driving the corresponding second light-emitting device EL.
Each second drive control circuit 20 is configured to make a path between the first drive control circuit 10 and the corresponding second light-emitting device EL conducting after the path is non-conducting for a period of time, when the drive current moves between the second drive control circuit 20 and the first wire L (e.g., to a fifth node N5 in
In the display substrate provided in the embodiment of the disclosure, by providing the second drive control circuit in the second display area, when the drive current generated by the first drive control circuit moves to the fifth node, the second drive control circuit disconnects the first drive control circuit from the corresponding second light-emitting device for a period of time to charge the parasitic capacitor generated by the first wire to raise the potential of the fifth node, and then the second drive control circuit makes the path between the first drive control circuit and the corresponding second light-emitting device conducting. In this way, currents flowing to the second light-emitting devices can be substantially same, and the brightness uniformity of the second display area is improved.
The display substrate provided in the embodiment of the disclosure may be an organic electroluminescent display substrate, that is, the above-mentioned first light-emitting devices and second light-emitting devices may be organic light-emitting diode devices, and the above-mentioned display substrate may also be other type of display substrate, which is not limited here.
In specific implementation, as shown in
In some embodiments, in the embodiment of the disclosure, the above-mentioned first wire may be made of a transparent conductive oxide material such as indium tin oxide (ITO), or other transparent conductive material, which is not limited here.
As shown in
In some embodiments, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
In the embodiment of the disclosure, mutual cooperation of the first drive control sub-circuit 101, the first threshold compensation sub-circuit 102, the first light emission control sub-circuit 103, the first data writing sub-circuit 104 and the first storage sub-circuit 105 enables the first drive control circuit 10 to generate the drive current for driving the second light-emitting device EL.
Specifically, in the above-mentioned display substrate provided in the embodiment of the disclosure,
Described above is only an example of the specific structure of the first drive control sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first drive control sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In specific implementation, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the first threshold compensation sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first threshold compensation sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In some embodiments, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the first light emission control sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first light emission control sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In practical applications, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the first data writing sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first data writing sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In some embodiments, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the first storage sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first storage sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In specific implementation, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
The first reset sub-circuit 106 being coupled to the first node N1, the first reset control terminal Re1 and a first reference signal terminal Vi1, respectively, and configured to provide a signal of the first reference signal terminal Vi1 to the first node N1 under the control of the first reset control terminal Re1 to achieve reset of the first drive control sub-circuit 101.
The second reset sub-circuit Fw being coupled to the second light-emitting device EL, a second reset control terminal Re2 and a second reference signal terminal Vi2, respectively, and configured to provide a signal of the second reference signal terminal Vi2 to the second light-emitting device EL under the control of the second reset control terminal Re2 to achieve reset of the second light-emitting device EL.
The second drive control circuit 20 includes:
In
The second drive control circuit 20 includes a second reset sub-circuit Fw and a second light emission control sub-circuit 201.
The second reset sub-circuit Fw being coupled to the second light-emitting device EL, a second reset control terminal Re2 and a second reference signal terminal Vi2, respectively, and configured to provide a signal of the second reference signal terminal Vi2 to the second light-emitting device EL under the control of the second reset control terminal Re2 to achieve reset of the second light-emitting device EL.
The second light emission control sub-circuit 201 is coupled to the first light emission control sub-circuit 103, the second light-emitting device EL, and a second light emission control signal terminal EM2, respectively, and configured to make the path between the first light emission control circuit 103 and the second light-emitting device EL conducting under the control of the second light emission control signal terminal EM2. By providing the second light emission control sub-circuit 201, the conducting or no-conducting states between the first light emission control circuit 103 and the second light-emitting device EL can be controlled under the control of the second light emission control signal terminal EM2, so that the parasitic capacitor of the first wire is pre-charged before the drive current flows to the second light-emitting device EL, and the drive current is controlled to flow to the second light-emitting device EL after the parasitic capacitor is charged.
In
Described above is only an example of the specific structure of the first reset sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the first reset sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In some embodiments, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the second reset sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the second reset sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
In specific implementation, in the above-mentioned display substrate provided in the embodiment of the disclosure, as shown in
Described above is only an example of the specific structure of the second light emission control sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structure of the second light emission control sub-circuit is not limited to the foregoing structure provided in the embodiment of the disclosure, but may also be other structure known to those skilled in the art, which is not limited here.
It should be noted that in the embodiment of the disclosure, in the above-mentioned pixel driving circuit, the first reset sub-circuit 106 and the second reset sub-circuit Fw are connected to different reference signal terminals, i.e., the first reset sub-circuit 106 is coupled to the first reference signal terminal Vi1, and the second reset sub-circuit Fw is coupled to the second reference signal terminal Vi2. In specific implementation, the first reset sub-circuit 106 and the second reset sub-circuit Fw may also be coupled to the same reference signal terminal; and similarly, the first reset sub-circuit 106 and the second reset sub-circuit Fw may also be coupled to the same reset control terminal, which is not limited here.
In some embodiments, the above-mentioned display substrate provided in the embodiment of the disclosure, referring to
In the embodiment of the disclosure, by providing the third drive control circuits correspondingly coupled to the first light-emitting devices, respectively, the corresponding first light-emitting device can be driven to emit light to achieve a display effect with relatively good picture quality.
In specific implementation, in the above-mentioned display substrate provided in the embodiment of the disclosure,
In the embodiment of the disclosure, mutual cooperation of the second drive control sub-circuit 301, the second threshold compensation sub-circuit 302, the third light emission control sub-circuit 303, the second data writing sub-circuit 304, the second storage sub-circuit 305, the third reset sub-circuit 306 and the fourth reset sub-circuit 307 enables the first second control circuit 30 to generate the drive current for driving the first light-emitting device EL′.
Specifically, in the above-mentioned display substrate provided in the embodiment of the disclosure,
The second threshold compensation sub-circuit 302 may include a twelfth switch transistor T12;
The third light emission control sub-circuit 303 may include a thirteenth switch transistor T13 and a fourteenth switch transistor T14,
The second data writing sub-circuit 304 may include a fifteenth switch transistor T15;
The second storage sub-circuit 305 may include a second capacitor C2.
The second capacitor C2 has a first electrode c3 coupled to the third power terminal VDD2, and a second electrode c4 coupled to the sixth node N6.
The third reset sub-circuit 306 is coupled to the sixth node N6, the third reset control terminal Re3 and the third reference signal terminal Vi3, respectively, and configured to provide a signal of the third reference signal terminal Vi3 to the sixth node N6 under the control of the third reset control terminal Re3 to achieve reset of the second drive control sub-circuit 301.
The fourth reset sub-circuit 307 is coupled to the first light-emitting device EL′, the fourth reset control terminal Re4 and the fourth reference signal terminal Vi4, respectively, and configured to provide a signal of the fourth reference signal terminal Vi4 to the first light-emitting device EL′ under the control of the fourth reset control terminal Re4, to achieve reset of the first light-emitting device EL′.
Described above is only an example of the specific structures of the second drive control sub-circuit, the second threshold compensation sub-circuit, the third light emission control sub-circuit, the second data writing sub-circuit, the second storage sub-circuit, the third reset sub-circuit and the fourth reset sub-circuit in the display substrate provided in the embodiment of the disclosure. In specific implementation, the specific structures of the above-mentioned sub-circuits are not limited to the foregoing structures provided in the embodiment of the disclosure, but may also be other structures known to those skilled in the art, which is not limited here.
It should be noted that in the embodiment of the disclosure, in the above-mentioned third drive control circuit, the third reset sub-circuit 306 and the fourth reset sub-circuit 307 are connected to different reference signal terminals, i.e., the third reset sub-circuit 306 is coupled to the third reference signal terminal Vi3, and the fourth reset sub-circuit 307 is coupled to the fourth reference signal terminal Vi4. In specific implementation, the third reset sub-circuit 306 and the fourth reset sub-circuit 307 may also be coupled to the same reference signal terminal; and similarly, the third reset sub-circuit 306 and the fourth reset sub-circuit 307 may also be coupled to the same reset control terminal, which is not limited here.
Based on the same inventive concept, an embodiment of the disclosure further provides a display device including the above-mentioned display substrate. The display device can be applied to a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or any other product or component with a display function. The problem-solving principle of the display device is similar to that of the above-mentioned display substrate, and thus for the implementation of the display device, reference may be made to the implementation of the above-mentioned display substrate, and repeated description is omitted.
In some embodiments, the above-mentioned display device provided in the embodiment of the present invention further includes an image collector.
The image collector is located in the second display area of the display substrate, and the image collector is located on a side of the display substrate away from a light emergent surface.
In specific implementation, the image collector may be a camera. In an image acquisition time period, light passes through gaps between adjacent second light-emitting devices in the display substrate and impinges on the image collector, and the image collector receives the light that passes through the display substrate, to acquire a corresponding picture. In practical applications, the graphics of a metal film layer, a black matrix and other non-transmissive film layers in the display substrate may be improved and light-transmissive areas are formed in the gaps between adjacent second light-emitting devices to enable light to pass through the display substrate. In addition, a fingerprint recognition sensor may also be used in place of the image collector to achieve an under-panel fingerprint recognition function, or both an image collector and a fingerprint recognition sensor may be provided in the second display area, which is not limited here.
Based on the same inventive concept, an embodiment of the present invention further provides a pixel driving circuit. The problem-solving principle of the pixel driving circuit is similar to that of the above-mentioned display substrate, and thus for the implementation of the pixel driving circuit, reference may be made to the implementation of the above-mentioned display substrate, and repeated description is omitted.
The pixel driving circuit provided in the embodiment of the disclosure, as shown in
In the embodiment of the disclosure, by providing the second drive control circuit, when the drive current generated by the first drive control circuit moves to the fifth node, the second drive control circuit disconnects the first drive control circuit from the corresponding second light-emitting device for a period of time to charge the parasitic capacitor generated by the first wire to raise the potential of the fifth node, and then the second drive control circuit makes the path between the first drive control circuit and the corresponding second light-emitting device conducting. In this way, currents flowing to the second light-emitting devices can be substantially same, and the brightness uniformity of the second display area is improved.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of the above-mentioned pixel driving circuit. The problem-solving principle of the driving method is similar to that of the above-mentioned pixel driving circuit, and thus for the implementation of the driving method, reference may be made to the implementation of the above-mentioned pixel driving circuit, and repeated description is omitted.
The driving method of the above-mentioned pixel driving circuit provided in the embodiment of the disclosure, as shown in
In the driving method provided in the embodiment of the disclosure, in the first time period, when the drive current generated moves between the second drive control circuit and the first wire (i.e., to the fifth node), the first drive control circuit is controlled to be disconnected from the corresponding second light-emitting device to charge the parasitic capacitor generated by the first wire to raise the potential of the fifth node, and in the second time period, the path between the first drive control circuit and the corresponding second light-emitting device is in conduction state. In this way, currents flowing to the second light-emitting devices can be substantially same, and the brightness uniformity of the second display area is improved.
The above-mentioned driving method provided in the embodiment of the disclosure is described in detail below by using the pixel driving circuit shown in
In specific implementation, in the above-mentioned driving method provided in the embodiment of the disclosure, the above-mentioned step S401 may include:
Further, in the above-mentioned step S401, the first light emission control signal terminal EM1 is applied with an effective signal after the applying of an effective signal to the second light emission control signal terminal EM2 is stopped; in this way, leakage can be avoided in the process of charging the parasitic capacitor generated by the first wire; otherwise, in a short period of time after starting to apply the effective signal to the first light emission control signal terminal EM1, a current can flow through the like second light-emitting device EL and cause light emission, and especially in high gray scale display, a flash can be obviously seen in the second light-emitting device EL in the first time period due to a large drive current. Specifically, it is possible that in the second sub-time period t2, after an effective signal is applied to the second light emission control signal terminal EM2 for a period of time, the applying of the effective signal to the second light emission control signal terminal EM2 is stopped, and then an effective signal is applied to the first light emission control signal terminal EM1 in the third sub-time period t3; or it is also possible that in the third sub-time period t3, the applying of the effective signal to the second light emission control signal terminal EM2 is stopped, and then an effective signal is applied to the first light emission control signal terminal EM1.
In specific implementation, in the above-mentioned driving method provided in the embodiment of the disclosure, the above-mentioned step S402 may include:
A working process of the display substrate provided in the embodiment of the disclosure is described below by using the pixel driving circuit shown in
In
In the first sub-time period t1, the signal re1 applied to the first reset control terminal Re1 is at a low level, causing the sixth switch transistor T6 to be turned on, and the signal of the first reference signal terminal Vi1 is provided to the first node N1 to reset the control terminal of the first switch transistor T1.
In the second sub-time period t2, the signal ga applied to the first scanning signal terminal Ga1 is at a low level, causing the second switch transistor T2 and the fifth switch transistor T5 to be turned on; as the fifth switch transistor T5 is turned on, the data signal of the first data signal terminal Da1 is provided to the second node N2, and as the second switch transistor T2 is turned on, the first node N1 connects the third node N3, causing the first switch transistor T1 to be turned on, such that the data signal is led to the first node N1; and the signal re2 applied to the second reset control terminal Re2 is at a low level, causing the seventh switch transistor T7 to be turned on, and the signal of the second reference signal terminal Vi2 is provided to the fourth node N4 and the fifth node N5 to reset the fourth node N4 and the fifth node N5; and at the same time, the signal em2 applied to the second light emission control signal terminal signal EM2 is also at a low level, causing the eighth switch transistor T8 to be turned on, and the signal of the second reference signal terminal Vi2 is provided to the second light-emitting device EL to achieve reset of the second light-emitting device EL.
In the third sub-time period t3, the signal em1 applied to the first light emission control signal terminal EM1 is at a low level, causing the third light-emitting transistor T3 and the fourth switch transistor T4 to be turned on to connect the first power terminal VDD1 and the second node N2 and connect the third node N3 and the fourth node N4, and the third switch transistor T3 causes the voltage of the first power terminal VDD1 to be supplied to the first electrode s of the first switch transistor T1, such that the first switch transistor T1 generates a drive current; and the signal em2 applied to the second light emission control signal terminal EM2 is at a high level, causing the eighth switch transistor T8 to be turned off, such that the drive current is continuously led to the parasitic capacitor generated by the first wire, and the voltages of the fourth node point N4 and the fifth node point N5 keep rising, and after the parasitic capacitor is fully charged, the voltage of the fourth node point N4 (or the fifth node N5) in each pixel driving circuit tends to the same.
In addition, to avoid leakage in the process of charging the parasitic capacitor generated by the first wire, it is possible that in the second sub-time period t2, after a low-level signal is applied to the second light emission control signal terminal EM2 for a period of time, a high-level signal is applied to the second light emission control signal terminal EM2, and a low-level signal is applied to the first light emission control signal terminal EM1 in the third sub-time period t3; or it is also possible that in the third sub-time period t3, a high-level signal is applied to the second light emission control signal terminal EM2, and then a low-level signal is applied to the first light emission control signal terminal EM1.
In the fourth sub-time period t4, the signal em1 applied to the first light emission control signal terminal EM1 is at a low level, and the signal applied em2 to the second light emission control signal terminal EM2 is at a low level, such that the drive current flows to the second light-emitting device EM to cause the second light-emitting device EM to emit light. Due to the pre-charging of the parasitic capacitor generated by the first wire in the third sub-time period t3, the voltage difference between the fourth node N4 (or the fifth node N5) and the second power terminal VSS1 is large, resulting in a large average current in a frame of time, thus avoiding the phenomenon of delayed turn-on of the second light-emitting device EL and improving the phenomenon of uneven display of a low gray-scale picture in the second display area.
In specific implementation, other methods of compensating for the parasitic capacitance of the first wire may also be used to further eliminate the influence of the resistance and parasitic capacitance of the first wire on the display effect.
In addition, by adopting the display substrate, the driving method thereof and the display device provided in the embodiments of the disclosure, the high gray-scale display effect of the second display area is not influenced while improving the uneven brightness of the second display area in low gray-scale display. Two comparative examples are used below for comparative analysis.
Comparative example I: Due to higher luminous efficiency of a green pixel, the green pixel has the smallest current at the same gray scale, and thus, the display effect of the green pixel reflects a low gray-scale display effect. Table 1 indicates the correspondence relationship between the duration of the third sub-time period, the load of the first wire and the current of the second light-emitting device. As shown in Table 1, “G=5.1V” in Table 1 indicates that the voltage difference between the first power terminal and the second power terminal is 5.1V; the maximum resistance of the first wire in Table 1 is 896 kΩ, that is, 100% corresponds to the resistance of 896 kΩ; and the maximum value of the parasitic capacitance of the first wire is 3.6 pF. It can be seen obviously from Table 1 that as the duration of the third sub-time period t3 varies between 200 μs and 2 ms, for different first resistance of the wire, the difference in the current of the second light-emitting device does not exceed 2%, which is within a debugging range of a gamma voltage; and when the duration of the third sub-time period t3 is 0, the current difference of the second light-emitting device is obvious, which is embodied as low luminance uniformity of the second display area in low gray-scale display. Therefore, for the second display area in low gray-scale display, the luminance unevenness of the second display area caused by the first wire can be improved by adjusting the third sub-time period t3, and on the basis of improving the luminance uniformity of the second display area, the duration of the third sub-time period t3 is minimized to avoid influencing the luminous effect of the fourth sub-time period t4.
Comparative example II: Due to lower luminous efficiency of a blue pixel, the blue pixel has a larger current at the same gray scale, and thus, the display effect of the blue pixel reflects a high gray-scale display effect. Table 2 indicates the correspondence relationship between the duration of the third sub-time period, the load of the first wire and the current of the second light-emitting device. As shown in Table 2, “B=2.8V” in Table 2 indicates that the voltage difference between the first power terminal and the second power terminal is 2.8V; the maximum resistance of the first wire in Table 2 is 896 kΩ, that is, 100% corresponds to the resistance of 896 kΩ; and the maximum value of the parasitic capacitance of the first wire is 3.6 pF. It can be seen obviously from Table 2 that as the duration of the third sub-time period t3 varies between 0 and 2 ms, for different first resistance of the wire, the difference in the current of the second light-emitting device does not exceed 2%, which is within a debugging range of a gamma voltage, and although the second light-emitting device has different currents for different durations of the third sub-time period t3, the current uniformity of the second light-emitting device is better when the duration of the third sub-time period t3 is fixed. Therefore, the third sub-time period t3 does not influence the high gray-scale display effect of the second display area.
In the pixel driving circuit, the driving method thereof, the display substrate and the display device provided in the embodiment of the disclosure, by providing the second drive control circuit in the second display area, when the drive current generated by the first drive control circuit moves to the fifth node, the second drive control circuit disconnects the first drive control circuit from the corresponding second light-emitting device for a period of time to charge the parasitic capacitor generated by the first wire to raise the potential of the fifth node, and then the second drive control circuit makes the path between the first drive control circuit and the corresponding second light-emitting device conducting. In this way, currents flowing to the second light-emitting devices can be substantially same, and the brightness uniformity of the second display area is improved.
The preferred embodiments of the disclosure are described above; however, once those skilled in the art get the basic inventive concepts, they can make additional variations and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all variations and modifications falling into the scope of the disclosure.
Evidently those skilled in the art can make various modifications and variations to the embodiments of the disclosure without departing from the spirit and scope of the embodiments of the disclosure.
Thus, the disclosure is also intended to encompass these modifications and variations to the embodiments of the disclosure so long as the modifications and variations come into the scope of the claims appended to the disclosure and their equivalents.
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PCT/CN2020/120484 | 10/12/2020 | WO |
Publishing Document | Publishing Date | Country | Kind |
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WO2022/067877 | 4/7/2022 | WO | A |
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