A display panel and display device

Abstract

This invention discloses a display panel and a display device. The display panel includes M pixel driving circuits and N sub-pixel units, where M < N, and both M and N are positive integers. The M pixel driving circuits drive the N sub-pixel units to emit light. The technical solution provided by this invention reduces the number of pixel driving circuits, thereby increasing the pixel density and display resolution of the display panel. Furthermore, it increases the number of sub-pixel units without increasing the number of pixel driving circuits, thus reducing costs.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a display panel and display device. Background Technology

[0002] With the rapid development of display technology, the display requirements for display panels are becoming increasingly stringent, especially the requirements for resolution and pixel density (Pixels Per Inch, PPI).

[0003] In existing display panels, each subpixel unit typically corresponds to a pixel driving circuit. As products are continuously updated and iterated, when derivative products need to add subpixel units, additional pixel driving circuits are also required. This not only increases the cost of new products but also requires readjusting the circuit structure, which in turn affects the performance of the products. Summary of the Invention

[0004] The present invention provides a display panel and display device that reduces the number of pixel driving circuits, thereby improving the pixel density and display resolution of the display panel. It also reduces costs by increasing the number of pixel driving circuits while increasing the number of sub-pixel units.

[0005] In a first aspect, embodiments of the present invention provide a display panel, comprising: M pixel driving circuits and N sub-pixel units, where M < N, and both M and N are positive integers;

[0006] M pixel driving circuits are used to drive N sub-pixel units to emit light.

[0007] In a second aspect, embodiments of the present invention also provide a display device, including a display panel as described in the first aspect.

[0008] The technical solution of the present invention sets up M pixel driving circuits to drive N sub-pixel units to emit light, where M < N. This allows some sub-pixel units to be driven to emit light by the same pixel driving circuit, which can reduce the number of pixel driving circuits to a certain extent, thereby improving the pixel density and display resolution of the display panel. Moreover, the structure is simple, and the number of pixel driving circuits does not need to be increased while increasing the number of sub-pixel units, thus reducing costs.

[0009] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, although the drawings described below are some specific embodiments of the present invention, those skilled in the art can extend and extend the basic concepts of the device structure, driving method and manufacturing method disclosed and indicated by various embodiments of the present invention to other structures and drawings. Undoubtedly, these should all be within the scope of the claims of the present invention.

[0011] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of a pixel driving circuit provided in an embodiment of the present invention;

[0013] Figure 3 This is a schematic diagram of another pixel driving circuit provided in an embodiment of the present invention;

[0014] Figure 4 for Figure 3 Timing diagram of the mid-pixel driving circuit;

[0015] Figure 5 This is a partial structural diagram of a display panel provided in an embodiment of the present invention;

[0016] Figure 6 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0017] Figure 7 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0018] Figure 8 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0019] Figure 9 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0020] Figure 10 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention;

[0021] Figure 11 A graph showing the display grayscale-driving voltage of a sub-pixel unit provided in an embodiment of the present invention;

[0022] Figure 12 A graph showing the display grayscale-driving current of a sub-pixel unit provided in an embodiment of the present invention;

[0023] Figure 13This is a schematic diagram of the structure of another display panel provided in an embodiment of the present invention;

[0024] Figure 14 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0025] Figure 15 A graph showing the display grayscale-driving voltage of two sub-pixel units in the same pixel unit group provided in an embodiment of the present invention;

[0026] Figure 16 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0027] Figure 17 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0028] Figure 18 A partial structural schematic diagram of another display panel provided in an embodiment of the present invention;

[0029] Figure 19 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the basic concepts disclosed and indicated in the embodiments of this invention, all other embodiments obtained by those skilled in the art are within the scope of protection of this invention.

[0031] In view of the problems in the background art, embodiments of the present invention provide a display panel, which includes M pixel driving circuits and N sub-pixel units, where M < N, and both M and N are positive integers; the M pixel driving circuits are used to drive the N sub-pixel units to emit light.

[0032] By adopting the above technical solution, M pixel driving circuits are set to drive N sub-pixel units to emit light, where M < N. This allows some sub-pixel units to be driven to emit light by the same pixel driving circuit, which can reduce the number of pixel driving circuits to a certain extent. This is beneficial for increasing the pixel density of the display panel and improving the display resolution. Moreover, the structure is simple, and the number of pixel driving circuits does not need to be increased while increasing the number of sub-pixel units, thus reducing costs.

[0033] The above is the core idea of ​​this application. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present invention, such as... Figure 1 As shown, the display panel 100 includes: M pixel driving circuits 10 and N sub-pixel units 20, where M < N, and both M and N are positive integers; the M pixel driving circuits 10 are used to drive the N sub-pixel units 20 to emit light.

[0035] It is understood that the arrangement of the M pixel driving circuits 10 in the display panel 100 can be any form, and this embodiment of the invention does not impose a specific limitation on it. Similarly, the arrangement of the N sub-pixel units 20 can also be any form, and this embodiment of the invention does not impose a specific limitation on it. Figure 1 An exemplary illustration shows that M pixel driving circuits 10 and N sub-pixel units 20 are arranged in an array, but it is not limited to this.

[0036] The sub-pixel unit 20 includes a light-emitting element electrically connected to the pixel driving circuit 10. The light-emitting element includes, but is not limited to, organic light-emitting diodes (OLEDs), miniature LEDs, or microLEDs. This embodiment of the invention does not specifically limit the type of light-emitting element and can be configured according to actual needs. The sub-pixel unit 20 can be a red sub-pixel unit, a green sub-pixel unit, a blue sub-pixel unit, a white sub-pixel unit, or a sub-pixel unit of other colors. This embodiment of the invention also does not specifically limit the type of color.

[0037] Specifically, the pixel driving circuit 10 can be a current-type pixel driving circuit or a voltage-type pixel driving circuit. It is understood that when the pixel driving circuit 10 is a current-type pixel driving circuit, it can effectively compensate for the threshold voltage drift and channel mobility of the driving transistor. When the pixel driving circuit 10 is a voltage-type pixel driving circuit, it is under constant current control and can drive the sub-pixel unit to emit light according to the data voltage written to the driving transistor. This embodiment of the invention does not limit the specific structure and driving method of the pixel driving circuit 10; it can be set according to actual needs.

[0038] Because the driving methods of the pixel driving circuits 10 are different, the specific connection methods between the M pixel driving circuits 10 and the N sub-pixel units 20 will also differ. Any connection method can be used without affecting the display effect. For example, among the N sub-pixel units 20, those sub-pixel units 20 with the same emission color, emission brightness, and driving signals (driving voltage or driving current) provided by the pixel driving circuit are all driven by the same pixel driving circuit 10. This reduces the number of pixel driving circuits 10, simplifies the structure, facilitates high pixel density settings on the display panel, improves display resolution, and reduces costs by increasing the number of pixel driving circuits without increasing the number of sub-pixel units.

[0039] It should be noted that M and N can be any positive integer values. This embodiment of the invention does not impose specific limitations on them and can be set according to actual needs.

[0040] Optional, Figure 2 This is a schematic diagram of a pixel driving circuit provided in an embodiment of the present invention, as shown below. Figure 2 As shown. The pixel driving circuit 10 includes a driving transistor T1, a data writing module 11, a light emission control module 12, and a storage module 13; the data writing module 11 is electrically connected to the gate of the driving transistor T1 and is used to write data signals to the driving transistor T1; the light emission control module 12 is used to control the driving transistor T1 to provide driving signals to the sub-pixel unit 20; the storage module 13 is used to store the data signals written to the gate of the driving transistor T1.

[0041] Specifically, the driving transistor T1 can be an N-channel transistor or a P-channel transistor; this embodiment of the invention does not impose a specific limitation on this. When the driving transistor T1 is an N-channel transistor, the pixel driving circuit 10 is a voltage-type pixel driving circuit. When the driving transistor T1 is turned on, under the action of the second power supply terminal ELVDD, the driving transistor T1 can provide a driving voltage to the sub-pixel unit 20 according to the data signal written to its gate. Preferably, the driving transistor T1 can be an intrinsic N-channel field-effect transistor (Native n-MOSFET), such as a depletion-type N-channel field-effect transistor. An intrinsic N-channel field-effect transistor is a transistor with a threshold voltage close to zero, which can make the voltage difference between the voltage applied to the sub-pixel unit 20 and the gate voltage of the driving transistor T1 smaller, and can more effectively utilize the voltage swing. When the driving transistor T1 is a P-channel transistor, the pixel driving circuit 10 is a current-type pixel driving circuit, and the driving transistor T1 can provide a driving current to the sub-pixel unit 20 according to the data signal written to its gate. This embodiment of the invention does not impose any limitation on the specific type of the driving transistor T1, and can set it according to actual needs. Figure 2 The driving transistor T1 is shown as a P-channel transistor only as an example.

[0042] Furthermore, the storage module 13 is used to store the data signal written to the gate of the driving transistor T1 to ensure that the pixel driving circuit 10 can drive the sub-pixel unit 20 to emit light continuously and stably. The light emission control module 12 can control the driving transistor T1 to provide a driving signal to the sub-pixel unit 20, that is, control the light emission duration of the sub-pixel unit 20. It can be understood that only when the light emission control module 12 is turned on can the driving transistor T1 transmit the driving signal to the sub-pixel unit 20, thereby driving the sub-pixel unit 20 to emit light.

[0043] It should be noted that the second terminal of the driving transistor T1 of each pixel driving circuit 10 in the display panel 100 can be electrically connected to one sub-pixel unit 20 or multiple sub-pixel units 20. This embodiment of the invention does not impose a specific limitation on this. Figure 2 The diagram shown is merely an example of a structural schematic showing the second pole of the driving transistor T1 of the pixel driving circuit 10 electrically connected to a sub-pixel unit 20, but is not limited thereto.

[0044] Optional, Figure 3 This is a schematic diagram of another pixel driving circuit provided in an embodiment of the present invention, as shown below. Figure 3 As shown. The data writing module 11 includes a first writing transistor T2 and a second writing transistor T3, which have different channel types. The first electrode of the first writing transistor T2 and the first electrode of the second writing transistor T3 are both electrically connected to the data signal terminal DATA. The second electrode of the first writing transistor T2 and the second electrode of the second writing transistor T3 are both electrically connected to the gate of the driving transistor T1. The gate of the first writing transistor T2 is electrically connected to the first scan signal terminal S1, and the gate of the second writing transistor T3 is electrically connected to the second scan signal terminal S2. The light emission control module 12 includes a light emission control transistor T4, whose first electrode is electrically connected to the second electrode of the driving transistor T1, whose second electrode is electrically connected to the sub-pixel unit 20, and whose gate is electrically connected to the light emission control signal terminal EMIT. The storage module 13 includes a storage capacitor Cst, whose first plate is electrically connected to the first power supply terminal VREF, and whose second plate is electrically connected to the gate of the driving transistor T1.

[0045] In this embodiment, the first write transistor T2 can be a P-type channel transistor and the second write transistor T3 can be an N-type channel transistor, or the first write transistor T2 can be an N-type channel transistor and the second write transistor T3 can be a P-type channel transistor. This embodiment does not impose specific limitations on these configurations and can be set according to actual needs. Figure 3An exemplary schematic diagram shows a first write transistor T2 being a P-type channel transistor and a second write transistor T3 being an N-type channel transistor, but the design is not limited to this. Thus, when the first scan signal s1 provided by the first scan signal terminal S1 is low, the first write transistor T2 is turned on; when the first scan signal s1 provided by the first scan signal terminal S1 is high, the first write transistor T2 is turned off. Similarly, when the second scan signal s2 provided by the second scan signal terminal S2 is high, the second write transistor T3 is turned on; when the second scan signal s2 provided by the second scan signal terminal S2 is low, the second write transistor T3 is turned off.

[0046] The light-emitting control transistor T4 can be a P-type channel transistor or an N-type channel transistor. This embodiment of the invention does not specifically limit this and can be set according to actual needs. Figure 3 The light-emitting control transistor T4 is shown as a P-channel transistor only, but is not limited to this. See also: Figure 3 , Figure 3 The diagram also shows a sub-pixel unit comprising an organic light-emitting diode (OLED), with the anode of the OLED electrically connected to the second terminal of the driving transistor T1, and the cathode of the OLED electrically connected to the third power supply terminal VCOM. For ease of explanation, Figure 3 The schematic diagram shown is merely an example of the structure in which the pixel driving circuit 10 is electrically connected to a sub-pixel unit 20, but is not limited thereto.

[0047] In an alternative embodiment, Figure 4 for Figure 3 The driving timing diagram of the pixel driving circuit shows that the driving cycle of the pixel driving circuit 10 includes a data writing stage t1 and a light emission stage t2. In the data writing stage t1, the first scan signal s1 of the first scan signal terminal S1 is at a low level. At this time, the first write transistor T2 is in the on state. The data signal Vdata of the data signal terminal DATA is written to the gate of the driving transistor T1 through the first write transistor T2 and stored in the storage capacitor Cst. At the same time, the light emission control signal Emit of the light emission control signal terminal EMIT is at a high level, controlling the light emission control transistor T4 to turn off.

[0048] During the light-emitting stage t2, the first scan signal s1 is high, controlling the first write transistor T2 to turn off, while the light-emitting control signal Emit is low, controlling the light-emitting control transistor T4 to turn on. At this time, the second power supply terminal ELVDD can be a positive power supply signal. The cathode of the sub-pixel unit 20 is electrically connected to the third power supply terminal VCOM, writing a negative power supply signal. A path is formed from the positive power supply signal to the negative power supply signal, so that the driving transistor T1, under the control of the second power supply terminal ELVDD, provides a driving signal to the sub-pixel unit 20 according to the data signal Vdata written to the gate. Since the driving transistor T1 is a P-type channel transistor, this driving signal is the driving current, thereby driving the sub-pixel unit 20 to emit light.

[0049] It should be noted that when the first scan signal s1 of the first scan signal terminal S1 controls the first write transistor T2 to be turned on, the second scan signal s2 of the second scan signal terminal S2 can control the second write transistor T3 to be turned on or off. This embodiment of the invention does not make specific limitations on this.

[0050] In other embodiments, during the data writing stage t1, the second scan signal s2 of the second scan signal terminal S2 can control the second write transistor T3 to turn on, so that the data signal Vdata of the data signal terminal DATA is written to the gate of the driving transistor T1 through the second write transistor T3. At this time, the first scan signal s1 of the first scan signal terminal S1 can control the first write transistor T2 to turn on or off. The specific process will not be described in detail here.

[0051] Optional, Figure 5 This is a partial structural diagram of a display panel provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the N sub-pixel units 20 emit the same color; the output of each pixel driving circuit 10 is electrically connected to the N sub-pixel units 20.

[0052] In this embodiment, the N sub-pixel units 20 in the display panel 100 emit the same color. The color can be red, green, blue, white, yellow, or magenta, etc. This embodiment does not specifically limit this and can be set according to actual needs.

[0053] refer to Figure 5Taking M=3 and N=4 as an example, the output of each of the three pixel driving circuits 10 is electrically connected to N sub-pixel units 20, that is, four sub-pixel units 40 are connected in parallel to the output of the three pixel driving circuits 10. When the pixel driving circuit 10 is a voltage-type pixel driving circuit, the four sub-pixel units 40 are driven by the three pixel driving circuits 10, which makes the driving voltage received by each sub-pixel unit 20 the same, and thus makes each sub-pixel unit 20 have the same luminous brightness under the same driving voltage, which is beneficial to improving display uniformity. When the pixel driving circuit 10 is a current-type pixel driving circuit, the driving current output by all pixel driving circuits 10 can be evenly distributed to all sub-pixel units 40, which also makes each sub-pixel unit 20 have the same luminous brightness under the same driving current, which is beneficial to improving display uniformity. Thus, while meeting the display requirements of the display panel 100, when the light emission colors of the N sub-pixel units 20 are the same, the output terminal of each pixel driving circuit 10 is electrically connected to the N sub-pixel units 20 to drive all the sub-pixel units 20 at the same time. This can reduce the number of pixel driving circuits 10, simplify the circuit structure, and help improve pixel density and resolution.

[0054] Optional, Figure 6 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, in conjunction with reference to the reference. Figure 2 and Figure 6 As shown, the N sub-pixel units 20 emit the same color; the pixel driving circuit 10 includes a driving transistor T1, which includes an N-channel thin film transistor; there are two pixel driving circuits 10 that drive different numbers of sub-pixel units 20.

[0055] It is understood that the driving transistor T1 of the pixel driving circuit 10 includes an N-channel thin film transistor, that is, the pixel driving circuit 10 is a voltage-type pixel driving circuit, which can provide driving voltage to the sub-pixel unit 20 to drive the sub-pixel unit 20 to emit light.

[0056] For example, refer to Figure 6 As shown, the structure of the pixel driving circuit 10 includes, but is not limited to, those shown. Figure 2 and Figure 3 The structure shown, Figure 6 The example only shows that the driving transistor T1, under the control of the second power supply terminal ELVDD, provides a driving voltage to the sub-pixel unit according to the data signal written by the first node N1, so as to drive the sub-pixel unit 20 to emit light. Figure 6An exemplary illustration shows a display panel 100 comprising two pixel driving circuits 10 driving sub-pixel units 20 with different numbers of sub-pixel units 20. One pixel driving circuit 10 drives two sub-pixel units 20, while the other pixel driving circuit 10 drives one sub-pixel unit 20, but this is not a limitation. Since the pixel driving circuits 10 are voltage-type pixel driving circuits, under the premise that the power signal provided to the second power supply terminal ELVDD in each pixel driving circuit 10 is the same, and the data signal written by the driving transistor T1 is the same, the driving voltage provided by the pixel driving circuit 10 to the sub-pixel units 20 is also the same, resulting in the same luminous brightness of each sub-pixel unit 20, ensuring the uniformity of display brightness. The number of sub-pixel units 20 driven by each pixel driving circuit 10 can be any value to meet display requirements. This embodiment of the invention does not specifically limit this number and can be set according to actual needs.

[0057] Optional, Figure 7 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 7 As shown, in the M pixel driving circuits 10, the output terminal of the driving transistor T1 of one pixel driving circuit 10 is electrically connected to N-M+1 sub-pixel units, and the output terminal of the driving transistor of each of the remaining pixel driving circuits 10 is electrically connected to one sub-pixel unit 20.

[0058] Specifically, in the M pixel driving circuits 10, the output terminal of the driving transistor T1 of the M-1 pixel driving circuits 10 is electrically connected to one sub-pixel unit 20, and is electrically connected to the M-1 sub-pixel units 20 in a one-to-one correspondence. This ensures that each pixel driving circuit 10 in the M-1 pixel driving circuits 10 drives one sub-pixel unit 20 to emit light, while all the remaining sub-pixel units 20 are driven to emit light by the same pixel driving circuit 10. Since the driving transistor T1 in the M pixel driving circuits 10 includes an N-channel thin-film transistor, that is, all M pixel driving circuits 10 are voltage-type pixel driving circuits, the N sub-pixel units 20 can still maintain the same final luminous brightness under the control of the same driving voltage, thereby ensuring display uniformity.

[0059] For example, refer to Figure 7 As shown, taking M=3 and N=5 as an example, the driving transistor T1 of one pixel driving circuit 10 is electrically connected to 3 sub-pixel units 20, which can drive 3 sub-pixel units 20 to emit light at the same time. The output terminal of the driving transistor T1 of each of the other pixel driving circuits 10 is electrically connected to one sub-pixel unit 20, which drives each sub-pixel unit 20 to emit light.

[0060] Optional, Figure 8 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 8As shown, the N sub-pixel units 20 emit the same color; the pixel driving circuit 10 includes a driving transistor T1, which includes a P-type channel thin film transistor; the M pixel driving circuits 10 include the i-th pixel driving circuit and the j-th pixel driving circuit, 1≤i≤M, 1≤j≤M, and i≠j; the difference ΔI between the driving current I1 output by the i-th pixel driving circuit and the driving current I2 output by the j-th pixel driving circuit satisfies: ΔI / ((I1+I2) / 2)≤20%.

[0061] It is understood that the driving transistor T1 of the pixel driving circuit 10 includes a P-type channel thin film transistor, that is, the pixel driving circuit 10 is a current-type pixel driving circuit, which can provide driving current to the sub-pixel unit 20 to drive the sub-pixel unit 20 to emit light.

[0062] For example, refer to Figure 8 As shown, N sub-pixel units 20 can be driven to emit light by M pixel driving circuits, and the number of sub-pixel units 20 driven by each pixel driving circuit 10 can be any value. Figure 8 The example only shows that some pixel driving circuits 10 drive two sub-pixel units 20 to emit light, and some pixel driving circuits 10 drive only one sub-pixel unit 20 to emit light. However, it is not limited to this. In this case, as long as the difference in the driving current output by each pixel driving circuit 10 is small, that is, the difference ΔI between the driving current I1 output by the i-th pixel driving circuit and the driving current I2 output by the j-th pixel driving circuit satisfies: ΔI / ((I1+I2) / 2)≤20%, it can be understood that the ratio of the difference ΔI between the driving current I1 output by the i-th pixel driving circuit and the driving current I2 output by the j-th pixel driving circuit to the average value of the two output driving currents is less than 20%, the display uniformity of the display panel 100 can still be guaranteed. This can reduce the number of pixel driving circuits 10, simplify the circuit structure, reduce costs, and improve pixel density and resolution.

[0063] Optional, Figure 9 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 9 As shown, the number of sub-pixel units 20 electrically connected to the output terminals of the driving transistors T1 of any two pixel driving circuits 10 is the same and greater than 1.

[0064] For example, Figure 9The diagram shows that the output of the driving transistor T1 of each pixel driving circuit 10 is electrically connected to two sub-pixel units 20, but it is not limited to this. At this time, the driving current received by the two sub-pixel units 20 electrically connected to the i-th pixel driving circuit is I1 / 2, and the driving current received by the two sub-pixel units 20 electrically connected to the j-th pixel driving circuit is I2 / 2. Under the premise that all sub-pixel units 20 emit the same color and have the same brightness, I1 / 2 = I2 / 2, which ensures the uniformity of the display and improves the pixel density and display resolution of the display panel.

[0065] Optional, Figure 10 This is a schematic diagram of another display panel structure provided in an embodiment of the present invention, such as... Figure 10 As shown, the N sub-pixel units 20 include N1 first sub-pixel units 21 and N2 second sub-pixel units 22. The emission color of the first sub-pixel units 21 is different from that of the second sub-pixel units 22. N1 and N2 are both positive integers, and N1+N2≤N. In the M pixel driving circuits 10, M1 pixel driving circuits 10 are used to drive N1 first sub-pixel units 21 to emit light, and M2 pixel driving circuits 10 are used to drive N2 second sub-pixel units 22 to emit light. M1 and M2 are both positive integers, and M1+M2≤M. Wherein, N1 / M1<N2 / M2.

[0066] The number of the first sub-pixel unit 21 and the second sub-pixel unit 22 can be any value, and the embodiments of the present invention do not impose specific limitations on this. Figure 10 This is for illustrative purposes only. Furthermore, the first sub-pixel unit 21 and the second sub-pixel unit 22 emit different colors; for example, the first sub-pixel unit 21 emits blue light and the second sub-pixel unit 22 emits green light, but this is not a limitation.

[0067] Specifically, the M pixel driving circuits 10 can be voltage-type pixel driving circuits or current-type pixel driving circuits. This embodiment of the invention does not impose specific limitations on this and can be configured according to actual needs. M1 pixel driving circuits 10 drive N1 first sub-pixel units 21 to emit light, and M2 pixel driving circuits 10 drive N2 second sub-pixel units 22 to emit light. Under the premise of meeting display requirements, the values ​​of M1, M2, N1, and N2 can be arbitrary, and this embodiment of the invention does not impose specific limitations on this either. Wherein, N1 / M1 < N2 / M2. It can be understood that the ratio of the number of sub-pixel units 20 to the number of pixel driving circuits 10 can be considered as the driving efficiency of the pixel driving circuits, that is, the number of sub-pixel units 20 that each pixel driving circuit 10 can drive. The larger the ratio of the number of sub-pixel units 20 to the number of pixel driving circuits 10, the greater the corresponding driving efficiency. Thus, N1 / M1 < N2 / M2 can be understood as the driving efficiency of the pixel driving circuit 10 used to drive the first sub-pixel unit 21 to emit light being less than the driving efficiency of the pixel driving circuit 10 used to drive the second sub-pixel unit 22 to emit light. For example, when the number of first sub-pixel units 21 N1 is the same as the number of second sub-pixel units 22 N2, the number of pixel driving circuits 10 used to drive the first sub-pixel unit 21 to emit light is greater than the number of pixel driving circuits 10 used to drive the second sub-pixel unit 22 to emit light, i.e., M1 > M2.

[0068] Thus, while meeting display requirements, the number of pixel driving circuits 10 used to drive the first sub-pixel unit 21 to emit light and the number of pixel driving circuits 10 used to drive the second sub-pixel unit 22 to emit light are reasonably allocated to ensure display uniformity.

[0069] Optional, continue to refer to Figure 10The total target luminance of the same number of first sub-pixel units 21 is greater than the total target luminance of the same number of second sub-pixel units 22. In other words, the average target luminance of the first sub-pixel units 21 is greater than the average target luminance of the second sub-pixel units 22. It can be understood that the target luminance of N1 first sub-pixel units 21 in the display panel 100 contributes more to the target luminance of N2 second sub-pixel units 22. At this time, the driving efficiency of the pixel driving circuit 10 that drives the first sub-pixel units 21 to emit light is less than the driving efficiency of the pixel driving circuit 10 that drives the second sub-pixel units 22 to emit light, i.e., N1 / M1 < N2 / M2. For example, when the number of first sub-pixel units 21 N1 is the same as the number of second sub-pixel units 22 N2, the number of pixel driving circuits 10 driving the first sub-pixel units 21 to emit light can be greater than the number of pixel driving circuits 10 driving the second sub-pixel units 22 to emit light. This ensures that N1 first sub-pixel units 21 can be driven to emit light by more pixel driving circuits 10 to meet the display requirements of the display panel 100. Without affecting the effect, the number of pixel driving circuits 10 can be reduced, which is beneficial to improving pixel density and resolution.

[0070] Optional, continue to refer to Figure 10 The luminous efficiency of the first sub-pixel unit 21 is less than that of the second sub-pixel unit 22.

[0071] It is understandable that the first sub-pixel unit 21 and the second sub-pixel unit 22 can be organic light-emitting diodes. Since the light-emitting materials of the sub-pixel units 20 with different light-emitting colors are different, the light-emitting efficiencies of the sub-pixel units 20 with different light-emitting colors are also different. When the driving transistors T1 in each pixel driving circuit 10 have the same size, the light-emitting efficiency of blue is lower. Therefore, when the same display grayscale needs to be presented, the driving signal required by the first sub-pixel unit 21 with lower light-emitting efficiency is larger than the value of the driving signal required by the second sub-pixel unit 22 with higher light-emitting efficiency.

[0072] For example, continue to refer to Figure 10The first sub-pixel unit 21 can emit blue light, and the second sub-pixel unit 22 can emit green light. The luminous efficiency of the first sub-pixel unit 21 is less than that of the second sub-pixel unit 22. Therefore, the driving efficiency of the pixel driving circuit 10 that drives the first sub-pixel unit 21 can be less than the driving efficiency of the pixel driving circuit 10 that drives the second sub-pixel unit 22, i.e., N1 / M1 < N2 / M2. For example, when the number of first sub-pixel units 21 (N1) and the number of second sub-pixel units 22 (N2) are the same, the number of pixel driving circuits 10 (M1) that drive the first sub-pixel units 21 can be greater than the number of pixel driving circuits 10 that drive the second sub-pixel units 22, i.e., N1 first sub-pixel units 21 can be driven by more pixel driving circuits 10, while N2 second sub-pixel units 22 can be driven by fewer pixel driving circuits 10, thus ensuring the uniformity of the display panel and improving the display effect.

[0073] Optionally, under any two adjacent display gray levels, the difference between the driving signals corresponding to the first sub-pixel unit 21 is less than the difference between the driving signals corresponding to the second sub-pixel unit 22; the driving signals include driving voltage or driving current.

[0074] It is understandable that each sub-pixel unit 20 has a corresponding display grayscale value when emitting light, which can be considered as the luminance of the sub-pixel unit 20. The higher the display grayscale value, the higher the luminance of the sub-pixel unit 20. At the same time, the value of the driving signal provided by the pixel driving circuit 10 to the sub-pixel unit 20 needs to be larger. The display grayscale can be divided into 256 (0-255) grayscale levels, but is not limited to this.

[0075] Specifically, Figure 11 This is a graph showing the display grayscale-driving voltage of a sub-pixel unit provided in an embodiment of the present invention. Figure 12 The graph showing the display grayscale-driving current of the sub-pixel unit provided in this embodiment of the invention shows that the driving voltage or driving current of the sub-pixel unit 20 varies at different display grayscales; the larger the display grayscale value, the larger the corresponding driving voltage or driving current value. Generally, when adjusting the sub-pixel unit 20 to emit light at different display grayscales, the display requirements can be met by adjusting the magnitude of the driving signal provided by the pixel driving circuit 10 to the sub-pixel unit 20. (Continue to refer to...) Figure 11 and Figure 12 As shown, the difference between the driving signals corresponding to adjacent display gray levels in sub-pixel unit 20 is the adjustment accuracy. The smaller the difference between the driving signals corresponding to adjacent display gray levels, the higher the adjustment accuracy of the display gray level. Conversely, the larger the difference between the driving signals corresponding to adjacent display gray levels, the lower the adjustment accuracy of the display gray level.

[0076] Thus, under any two adjacent display grayscale levels, the difference in the driving signal corresponding to the first sub-pixel unit 21 is less than the difference in the driving signal corresponding to the second sub-pixel unit 22. This can be understood as the adjustment precision of the display grayscale of the first sub-pixel unit 21 being greater than that of the display grayscale of the second sub-pixel unit 22. In this case, the driving efficiency of the pixel driving circuit 10 that drives the first sub-pixel unit 21 to emit light can be less than the driving efficiency of the pixel driving circuit 10 that drives the second sub-pixel unit 22 to emit light, i.e., N1 / M1 < N2 / M2. For example, when the number of first sub-pixel units 21 N1 and the number of second sub-pixel units 22 N2 are the same, the number of pixel driving circuits 10 M1 that drives the first sub-pixel unit 21 to emit light can be greater than the number of pixel driving circuits 10 M2 that drives the second sub-pixel unit 22 to emit light. That is, N1 first sub-pixel units 21 can be driven to emit light by more pixel driving circuits 10, while N2 second sub-pixel units 22 can be driven to emit light by fewer pixel driving circuits 10, so as to ensure the uniformity of the display panel and improve the display effect.

[0077] Optional, Figure 13 This is a schematic diagram of another display panel provided in an embodiment of the present invention. Figure 14 This is a partial structural schematic diagram of another display panel provided in an embodiment of the present invention, in conjunction with reference to the reference. Figure 13 and Figure 14 As shown, the display panel 100 includes multiple pixel unit groups 30, and each pixel unit group 30 includes multiple sub-pixel units 20; the pixel driving circuit 10 includes a driving transistor T1, which includes an N-channel thin-film transistor; in the same pixel unit group 30, under any display grayscale, when the difference between the maximum driving voltage and the minimum driving voltage of the sub-pixel unit 20 is less than or equal to 5V, the pixel unit group 30 is driven to emit light by the same pixel driving circuit 10.

[0078] It is understood that the driving transistor T1 of the pixel driving circuit 10 includes an N-channel thin film transistor, that is, the pixel driving circuit 10 is a voltage-type pixel driving circuit, which can provide driving voltage to the sub-pixel unit 20 to drive the sub-pixel unit 20 to emit light.

[0079] Specifically, the number of sub-pixel units 20 in the same pixel unit group 30 can be any value. This embodiment of the invention does not impose a specific limitation on this, and it can be set according to actual needs. Figure 15 This is a graph showing the display grayscale-driving voltage of two sub-pixel units in the same pixel unit group provided in an embodiment of the present invention, in conjunction with reference to... Figure 14 and Figure 15As shown, in the same pixel unit group 30, under any display grayscale, the difference between the maximum driving voltage and the minimum driving voltage of the sub-pixel unit 20 is less than or equal to 5V, i.e., U1-U2≤5V. It can be understood that the driving voltage values ​​of all sub-pixel units 20 in the pixel unit group 30 are very small, making the difference in the luminous brightness of all sub-pixel units 20 very small. At this time, the pixel unit group 30 can be driven to emit light by the same pixel driving circuit 10. While meeting the display requirements, the number of pixel driving circuits 10 can be reduced, thereby improving the pixel density of the display panel. Furthermore, when adding sub-pixel units 20 in derivative products, there is no need to increase the number of pixel driving circuits 10, thus reducing costs.

[0080] Optional, Figure 16 This is a partial structural diagram of another display panel provided in an embodiment of the present invention, as shown below. Figure 16 As shown, two adjacent sub-pixel units 20 are respectively the third sub-pixel unit 23 and the fourth sub-pixel unit 24. The pixel driving circuit 10 includes a first pixel driving circuit 11 and a second pixel driving circuit 12. The output terminal of the first pixel driving circuit 11 is electrically connected to the third sub-pixel unit 23 through a voltage divider module 40, and the output terminal of the second pixel driving circuit 12 is electrically connected to the fourth sub-pixel unit 24. When the voltage difference across the voltage divider module 40 is less than or equal to 5V, the first pixel driving circuit 11 is multiplexed as the second pixel driving circuit 12.

[0081] The pixel driving circuit 10 includes a driving transistor T1, which includes an N-channel thin-film transistor. That is, the pixel driving circuit 10 is a voltage-type pixel driving circuit, which can provide a driving voltage to the sub-pixel unit 20 to drive the sub-pixel unit 20 to emit light.

[0082] Specifically, the voltage divider module 40 can be a switching transistor, resistor, or diode, etc., and this embodiment of the invention does not impose specific limitations on it. Figure 16This is merely an illustrative partial structural diagram of the display panel 100, and is not limited thereto. At any display grayscale, when the driving voltages provided by the first pixel driving circuit 11 and the second pixel driving circuit 12 are the same, the difference between the driving voltage required by the third sub-pixel unit 23 and the driving voltage required by the fourth sub-pixel unit 24 is the voltage drop across the voltage divider module 40, i.e., the voltage difference across the voltage divider module 40. When this difference is less than or equal to 5V, the difference in driving voltage received by the third sub-pixel unit 23 and the fourth sub-pixel unit 24 is very small, resulting in a small difference in brightness. In this case, the first pixel driving circuit 11 can be reused as the second pixel driving circuit 12 to reduce the number of pixel driving circuits 10, thereby improving the pixel density of the display panel. Furthermore, in derivative products, while adding sub-pixel units 20, there is no need to increase the number of pixel driving circuits 10, thus reducing costs.

[0083] In an alternative embodiment, the voltage divider module 40 includes a diode or an adjustable resistor. (See reference...) Figure 17 As shown, the anode of the diode is electrically connected to the second electrode of the driving transistor T1, and the cathode of the diode is electrically connected to the third sub-pixel unit 23. The diode can be an ideal diode or a diode with very low on-resistance; this embodiment of the invention does not specifically limit its application. (See reference...) Figure 18 As shown, the voltage divider module 40 can also be an adjustable resistor, and the resistance value can be set according to actual needs. This embodiment of the invention does not make specific limitations on this, so as to adjust the driving voltage received by the third sub-pixel unit 23, thereby adjusting the light emission brightness of the third sub-pixel unit 23 to meet different display requirements.

[0084] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 19 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 19 As shown, the display device 200 provided in this embodiment of the invention includes all the technical features of the display panel 100 provided in this embodiment of the invention, and can achieve the beneficial effects of the display panel 100 provided in this embodiment of the invention. Similarities can be found in the above description of the display panel 100 provided in this embodiment of the invention, and will not be repeated here. The display device 200 provided in this embodiment of the invention can be a near-eye display device, or any electronic product with display function, including but not limited to the following categories: VR (Virtual Reality) products, AR (Augmented Reality) products, televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control equipment, touch interactive terminals, etc. This embodiment of the invention does not impose any special limitations on these categories.

[0085] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, include: M pixel driving circuits and N sub-pixel units, M < N, and both M and N are positive integers; M pixel driving circuits are used to drive N sub-pixel units to emit light; Wherein, the N sub-pixel units emit the same color, the pixel driving circuit includes a driving transistor, the driving transistor includes an N-channel thin film transistor; there are two pixel driving circuits that drive different numbers of sub-pixel units; In the M pixel driving circuits, the output terminal of the driving transistor of one pixel driving circuit is electrically connected to N-M+1 sub-pixel units, and the output terminal of the driving transistor of each of the remaining pixel driving circuits is electrically connected to one sub-pixel unit. Alternatively, the N sub-pixel units emit the same color, and the pixel driving circuit includes a driving transistor, which includes a P-channel thin-film transistor. The M pixel driving circuits include the i-th pixel driving circuit and the j-th pixel driving circuit, 1≤i≤M, 1≤j≤M, and i≠j; The difference ΔI between the driving current I1 output by the i-th pixel driving circuit and the driving current I2 output by the j-th pixel driving circuit satisfies: ΔI / ((I1+I2) / 2)≤20%; Alternatively, the N sub-pixel units may include N1 first sub-pixel units and N2 second sub-pixel units, wherein the emission color of the first sub-pixel units is different from the emission color of the second sub-pixel units; N1 and N2 are both positive integers, and N1 + N2 ≤ N; among the M pixel driving circuits, M1 pixel driving circuits are used to drive N1 first sub-pixel units to emit light, and M2 pixel driving circuits are used to drive N2 second sub-pixel units to emit light, wherein M1 and M2 are both positive integers, and M1 + M2 ≤ M; where N1 / M1 < N2 / M2; Alternatively, the display panel may include multiple pixel unit groups, and the pixel unit groups may include multiple sub-pixel units; The pixel driving circuit includes a driving transistor, and the driving transistor includes an N-channel thin-film transistor. Within the same pixel unit group, when the difference between the maximum driving voltage and the minimum driving voltage of the sub-pixel unit is less than or equal to 5V under any display grayscale, the pixel unit group is driven to emit light by the same pixel driving circuit.

2. The display panel according to claim 1, characterized in that, When the emission colors of N sub-pixel units are the same, the pixel driving circuit includes a driving transistor, which includes a P-channel thin-film transistor; the M pixel driving circuits include the i-th pixel driving circuit and the j-th pixel driving circuit, 1≤i≤M, 1≤j≤M, and i≠j; the difference ΔI between the driving current I1 output by the i-th pixel driving circuit and the driving current I2 output by the j-th pixel driving circuit satisfies: ΔI / ((I1+I2) / 2)≤20%, the number of sub-pixel units electrically connected to the output terminals of any two pixel driving circuits is the same and greater than 1.

3. The display panel according to claim 1, characterized in that, When N sub-pixel units include N1 first sub-pixel units and N2 second sub-pixel units, the emission color of the first sub-pixel units is different from the emission color of the second sub-pixel units; N1 and N2 are both positive integers, and N1+N2≤N; among M pixel driving circuits, M1 pixel driving circuits are used to drive N1 first sub-pixel units to emit light, and M2 pixel driving circuits are used to drive N2 second sub-pixel units to emit light, M1 and M2 are both positive integers, and M1+M2≤M; wherein, when N1 / M1<N2 / M2, the total target emission brightness of the same number of first sub-pixel units is greater than the total target emission brightness of the same number of second sub-pixel units.

4. The display panel according to claim 1, characterized in that, When the N sub-pixel units include N1 first sub-pixel units and N2 second sub-pixel units, the emission color of the first sub-pixel units is different from the emission color of the second sub-pixel units; N1 and N2 are both positive integers, and N1+N2≤N; among the M pixel driving circuits, M1 pixel driving circuits are used to drive N1 first sub-pixel units to emit light, and M2 pixel driving circuits are used to drive N2 second sub-pixel units to emit light, M1 and M2 are both positive integers, and M1+M2≤M; wherein, when N1 / M1<N2 / M2, the luminous efficiency of the first sub-pixel unit is less than the luminous efficiency of the second sub-pixel unit.

5. The display panel according to claim 1, characterized in that, When N sub-pixel units include N1 first sub-pixel units and N2 second sub-pixel units, the emission color of the first sub-pixel units is different from the emission color of the second sub-pixel units; N1 and N2 are both positive integers, and N1+N2≤N; among M pixel driving circuits, M1 pixel driving circuits are used to drive N1 first sub-pixel units to emit light, and M2 pixel driving circuits are used to drive N2 second sub-pixel units to emit light, M1 and M2 are both positive integers, and M1+M2≤M; where N1 / M1<N2 / M2, under any two adjacent display gray levels, the difference in the driving signal corresponding to the first sub-pixel unit is less than the difference in the driving signal corresponding to the second sub-pixel unit; The driving signal includes driving voltage or driving current.

6. The display panel according to claim 1, characterized in that, When the display panel includes multiple pixel unit groups, the pixel unit group includes multiple sub-pixel units; The pixel driving circuit includes a driving transistor, and the driving transistor includes an N-channel thin-film transistor. Within the same pixel unit group, when the difference between the maximum driving voltage and the minimum driving voltage of the sub-pixel unit is less than or equal to 5V under any display grayscale, and the pixel unit group is driven to emit light by the same pixel driving circuit, two adjacent sub-pixel units are respectively the third sub-pixel unit and the fourth sub-pixel unit. The pixel driving circuit includes a first pixel driving circuit and a second pixel driving circuit. The output terminal of the first pixel driving circuit is electrically connected to the third sub-pixel unit through a voltage divider module, and the output terminal of the second pixel driving circuit is electrically connected to the fourth sub-pixel unit. When the voltage difference across the voltage divider module is less than or equal to 5V, the first pixel driving circuit is reused as the second pixel driving circuit.

7. The display panel according to claim 6, characterized in that, The voltage divider module includes diodes or adjustable resistors.

8. The display panel according to claim 1, characterized in that, The pixel driving circuit includes a driving transistor, a data writing module, a light emission control module, and a storage module; The data writing module is electrically connected to the gate of the driving transistor and is used to write data signals to the driving transistor. The light-emitting control module is used to control the driving transistor to provide driving signals to the sub-pixel unit; The storage module is used to store data signals written to the gate of the driving transistor.

9. The display panel according to claim 8, characterized in that, The data writing module includes a first writing transistor and a second writing transistor, the first writing transistor and the second writing transistor having different channel types; the first terminal of the first writing transistor and the first terminal of the second writing transistor are both electrically connected to the data signal terminal, the second terminal of the first writing transistor and the second terminal of the second writing transistor are both electrically connected to the gate of the driving transistor, the gate of the first writing transistor is electrically connected to the first scan signal terminal, and the gate of the second writing transistor is electrically connected to the second scan signal terminal. The light emission control module includes a light emission control transistor, the first terminal of which is electrically connected to the second terminal of the driving transistor, the second terminal of which is electrically connected to the sub-pixel unit, and the gate of which is electrically connected to the light emission control signal terminal. The storage module includes a storage capacitor, the first plate of which is electrically connected to a first power supply terminal, and the second plate of which is electrically connected to the gate of the driving transistor.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

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