Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device. They relate to the field of display technology and are used to solve the technical problem of display panel display brightness differences. The display panel includes a first display area and a second display area, wherein the transmittance of the second display area is greater than the transmittance of the first display area. The display panel includes a first pixel located in the first display area and a first drive circuit. The first drive circuit includes a first drive transistor. A second pixel set is located in the second display area. Each second pixel set includes two or more second pixels connected in parallel. The second pixels in a second pixel set share a second drive circuit. A second drive circuit includes two or more second drive transistors connected in parallel. The number of second pixels in a second pixel set is equal to the number of second drive transistors in a second drive circuit. The channel ratio of the first drive transistor is the same as the channel ratio of the second drive transistor.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) display panels are devices that utilize the self-luminescence principle of organic light-emitting materials to achieve display. Compared to liquid crystal displays (LCDs), OLED display panels offer many advantages, including self-luminescence, fast response speed, low-voltage drive, high brightness, and thinness. As a result, they are gradually becoming mainstream in the display field.

[0003] In order to increase the screen-to-body ratio of the display panel, the display panel needs to have a complete display surface. The display panel includes a main screen display area and a sub-screen display area. The sub-screen display area refers to a light-transmitting display area. Usually, a photosensitive element such as a camera module is set below the sub-screen display area. The main screen display area is provided with pixels and a first drive circuit. A first drive circuit drives one pixel to work. Multiple pixel sets and a second drive circuit are set on the sub-screen display area. A second drive circuit drives multiple parallel pixels at the same time. At present, the size of the driving transistor in the second drive circuit is different from the size of the driving transistor in the first drive circuit, which affects the display effect of the display panel. Summary of the Invention

[0004] In view of the above problems, embodiments of the present application provide a display panel and a display device, which can effectively improve the brightness uniformity and consistency of the first display area and the second display area, thereby enhancing the display effect of the display panel.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a display panel, comprising a first display area and a second display area, wherein the transmittance of the second display area is greater than the transmittance of the first display area, and the display panel comprises:

[0007] A first pixel is located in a first display area;

[0008] A first driving circuit is located in the first display area, and is used to drive the first pixel to display. The first driving circuit includes a first driving transistor;

[0009] A second pixel set is located in the second display area, each second pixel set including two or more second pixels connected in parallel;

[0010] a second driving circuit, wherein the second pixels in a second pixel set share one second driving circuit, and one second driving circuit includes two or more second driving transistors connected in parallel;

[0011] The number of second pixels in a second pixel set is equal to the number of second driving transistors in a second driving circuit, and the channel ratio of the first driving transistor is the same as the channel ratio of the second driving transistor.

[0012] In one possible implementation, the second driver circuit further includes a signal writing module, which is shared by two or more second driver transistors and is configured to write a data signal to the gate of the second driver transistor. The signal writing module can accurately control the conduction or cutoff of the second driver transistor, thereby improving control precision.

[0013] In one possible implementation, the second driving circuit also includes an initialization module, and more than two second driving transistors share the initialization module. The initialization module is used to transmit a reference voltage signal to the gate of the second driving transistor, which can realize the operation of initializing the potential of the gate of the second driving transistor, so that the gate voltage of the second driving transistor is more accurate when it is working.

[0014] In one possible implementation, the initialization module is also used to transmit a reference voltage signal to the first electrode of the second pixel, which can realize the operation of initializing the potential of the first electrode in the second pixel and avoid leakage current in the first electrode due to different light-emitting voltages between adjacent pixels of different colors.

[0015] In a possible implementation, the second driving circuit further includes a capacitor, and the gates of the two or more second driving transistors are electrically connected to the capacitor.

[0016] In one possible implementation, the second driving circuit is located in the second display area, and a second driving circuit is correspondingly arranged under a second pixel set. This can help reduce the distribution density of the second driving circuits and reduce the possibility of light diffraction or reflection and refraction to form messy light due to the high local density of the second driving circuits.

[0017] In one possible implementation, in a second pixel set, a second driving transistor is correspondingly arranged under a second pixel, which helps to reduce the distribution density of the second driving transistors and reduce the possibility of local transmittance deviation in the second display area due to excessive concentration of opaque second driving transistors.

[0018] In one possible implementation, a first signal line is set between more than two second driving circuits. The first signal line is used to electrically connect different second driving circuits. The first signal line is a transparent line, which can help reduce the possibility of the first signal line blocking or reflecting light and improve the transmittance of the second display area.

[0019] In a possible implementation, the first signal line includes at least one of an indium tin oxide thin film wiring and an indium zinc oxide thin film wiring.

[0020] In one possible implementation, a second signal line is provided between the first driving circuit and the second driving circuit. The second signal line is used to electrically connect the first driving circuit and the second driving circuit. The second signal line is a transparent line, which can help reduce the possibility of the portion of the second signal line located in the second display area blocking or reflecting light, thereby improving the transmittance of the second display area.

[0021] In a possible implementation, the second signal line includes at least one of an indium tin oxide thin film wiring and an indium zinc oxide thin film wiring.

[0022] In a possible implementation, at least part of the second driving circuit is located in the first display area, thereby further reducing the number of second driving circuits in the second display area and the space occupied, which is conducive to improving the light transmittance of the second display area.

[0023] In a possible implementation, the first display area includes a first sub-display area and a second sub-display area, the second sub-display area is located between the second display area and the first sub-display area, and at least part of the second driving circuit is located in the second sub-display area.

[0024] A second aspect of the embodiments of the present application provides a display device, comprising:

[0025] The display panel as described above;

[0026] The photosensitive element is disposed below the second display area.

[0027] In the display panel and display device of the present invention, two or more second drive transistors connected in parallel are provided in the second drive circuit, and the number of the second drive transistors is the same as the number of second pixels in a second pixel set, so that the second drive transistors and the second pixels are provided in a one-to-one correspondence. Therefore, the sum of the drive currents output by each second drive transistor can be equal to the sum of the drive currents required by each second pixel. When the drive current required by a first pixel is equal to the drive current required by a second pixel, the drive current output by a first drive transistor can be equal to the drive current output by a second drive transistor, so that the channel ratio of the first drive transistor can be the same as the channel ratio of the second drive transistor. The transfer characteristic curve of the first drive transistor can be the same as the transfer characteristic curve corresponding to the second drive transistor. When the power supply signal VDD / VSS voltage drop (IR drop) is the same, the corresponding drop currents of the first drive transistor and the second drive transistor with the same channel ratio can maintain good consistency, effectively reducing the possibility of a difference in display brightness between the first display area and the second display area, ensuring brightness uniformity and consistency between the first display area and the second display area, and improving the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 This is a schematic structural diagram of a display panel according to an embodiment of the present application;

[0030] Figure 2 for Figure 1 The enlarged schematic diagram of R in the middle;

[0031] Figure 3 for Figure 2 The enlarged schematic diagram of M in the middle;

[0032] Figure 4 Schematic diagram of a partial structure of a second pixel set and a second driving circuit according to an embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of an equivalent circuit of a second driving circuit provided in one embodiment of the present application;

[0034] Figure 6 A schematic diagram of a partial structure of a second pixel set and a second driving circuit provided in another embodiment of the present application;

[0035] Figure 7 A partial schematic diagram of a display panel provided in one embodiment of the present application;

[0036] Figure 8 A partial schematic diagram of a display panel provided in another embodiment of the present application.

[0037] Description of reference numerals:

[0038] 10. Display panel;

[0039] 20. First pixel;

[0040] 30. A first driving circuit;

[0041] 40. Second pixel set; 41. Second pixel;

[0042] 50. Second driving circuit; 51. Second driving transistor; 52. Signal writing module; 53. Initialization module; 54. Capacitor;

[0043] 60. First signal line;

[0044] 70. Second signal line;

[0045] AA1, first display area; AA11, first sub-display area; AA12, second sub-display area;

[0046] AA2, second display area. DETAILED DESCRIPTION

[0047] In display devices such as mobile phones or tablets, to increase the screen-to-body ratio of the display panel, a photosensitive element, such as a front-facing camera, infrared sensor, or proximity sensor, may be provided on one side of the display panel. This eliminates the need for openings in the display panel and does not affect the display quality of the display panel. In some embodiments, a display area with both light-transmitting and display capabilities may be provided on the display panel, and the photosensitive element may be positioned below the light-transmitting display area, thereby achieving a full-screen display of the display panel.

[0048] The light-transmitting display area includes pixels and a driving circuit. After long-term research, the inventors found that in order to improve the transmittance of the light-transmitting display area, multiple pixels can be connected in parallel to form a pixel set. One pixel set corresponds to one driving circuit, that is, multiple parallel pixels share one driving circuit. The driving circuit includes a driving transistor (DTFT). The driving current output by a driving transistor is N times the driving current required by each pixel. Among them, the value of N can be the number of pixels in a pixel set. For example, two parallel pixels can form a pixel set. In the two parallel pixels, the driving current required by each pixel is I, then the driving current output by a driving transistor in the driving circuit needs to be 2I.

[0049] The display panel also includes a main display area, which can be arranged around the light-transmitting display area. The main display area includes pixels and a drive circuit. Each pixel corresponds to a drive circuit, that is, one drive circuit drives one pixel for display. The drive circuit includes a drive transistor. For example, if the drive current on a pixel is I, then the drive current output by a drive transistor in the drive circuit needs to be I.

[0050] Therefore, the driving current of the driving transistor in the driving circuit of the transparent display area is greater than the driving current of the driving transistor in the driving circuit of the main display area, so that the size of the driving transistor in the driving circuit of the transparent display area needs to be greater than the size of the driving transistor in the driving circuit of the main display area, that is, the channel ratio of the driving transistor in the driving circuit of the transparent display area needs to be greater than the channel ratio of the driving transistor in the driving circuit of the main display area.

[0051] The brightness of a pixel is proportional to the drive current flowing through the pixel. The magnitude of the drive current depends on the channel ratio of the drive transistor. The channel ratio of the drive transistor refers to the ratio of the channel width W of the drive transistor to the channel length L of the drive transistor. The brightness of the pixel can be controlled by adjusting the channel ratio of the drive transistor.

[0052] The driving transistor includes a semiconductor layer and a gate. The semiconductor layer includes a source region, a drain region, and a channel region. The channel region is located between the source region and the drain region. An insulating layer may be provided between the semiconductor layer and the gate. The channel region in the region where the semiconductor layer and the gate overlap defines a channel length L and a channel width W. The dimensions of the driving transistor may be determined by the channel width W and the channel length L.

[0053] Since the channel ratio of the driving transistor in the driving circuit of the transparent display area needs to be greater than the channel ratio of the driving transistor in the driving circuit of the main display area, the transfer characteristic curve corresponding to the driving transistor in the driving circuit of the transparent display area is different from the transfer characteristic curve of the driving transistor in the driving circuit of the main display area. Therefore, when the power supply signal VDD / VSS voltage drop (IR drop) is the same, there is an inconsistency in the corresponding falling current of the driving transistors of different sizes, resulting in a difference in display brightness between the main display area and the transparent display area, affecting the display effect.

[0054] In response to the above technical problems, the present application provides an improved technical solution, in which the display panel includes a first display area and a second display area. The transmittance of the second display area is greater than that of the first display area. The first display area is provided with first pixels and a first driving circuit. The number of first pixels is arranged in a one-to-one correspondence with the number of first driving circuits. The first driving circuit includes a first driving transistor. The second display area with higher transmittance is provided with a second pixel set. Each second pixel set includes two or more second pixels connected in parallel. All second pixels in each second pixel set share a second driving circuit. It should be noted that the second pixels connected in parallel do not change the driving voltage of the second driving circuit. A second driving circuit includes two or more second driving transistors connected in parallel. The number of second pixels included in a second pixel set is equal to the number of second driving transistors in a second driving circuit. The channel ratio of the first driving transistor is the same as the channel ratio of the second driving transistor. Therefore, the transfer characteristic curve corresponding to the second driving transistor is the same as the transfer characteristic curve of the first driving transistor. Therefore, when the power supply signal VDD / VSS voltage drop (IRdrop) is the same, the corresponding falling current of the driving transistors of the same size is consistent, effectively reducing the possibility of difference in display brightness between the first display area and the second display area.

[0055] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be further described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0056] Figure 1 The structure of a display panel according to an embodiment of the present application is schematically shown. Figure 2 for Figure 1 Enlarged view of R in the middle. Figure 1 and Figure 2As shown, in an embodiment of the present application, the display panel 10 includes a first display area AA1 and a second display area AA2. The transmittance of the second display area AA2 is greater than the transmittance of the first display area AA1. The first display area AA1 can be used as a main display area. The second display area AA2 can be used as a secondary display area. A photosensitive element (not shown in the figure) can be provided on the back of the second display area AA2. For example, the photosensitive element can be, but is not limited to, a camera module or a light sensor. The second display area AA2 can also display images, thereby increasing the display area of ​​the display panel 10 and realizing full-screen display of the display panel 10.

[0057] Figure 3 for Figure 2 Enlarged view of M in the middle. Figure 3 As shown, the first display area AA1 includes a first pixel 20 and a first drive circuit 30. The first drive circuit 30 is used to drive the first pixel 20 to emit light and display. The number of first drive circuits 30 is equal to the number of first pixels 20, that is, one first drive circuit 30 is provided for each first pixel 20. The first drive circuit 30 includes a first drive transistor (not shown in the figure). The first drive transistor outputs a drive current. The first pixel 20 receives the drive current to achieve light-emitting display. The drive current required for the first pixel 20 to emit light can be equal to the drive current output by the first drive transistor.

[0058] Figure 4 The partial structure of the second pixel set 40 and the second driving circuit 50 of the present application is schematically shown. Figure 3 and Figure 4 As shown, the second display area AA2 includes a second pixel set 40 and a second driving circuit 50. A second pixel set 40 includes more than two second pixels 41. In a second pixel set 40, more than two second pixels 41 are connected in parallel. A second pixel set 40 shares a second driving circuit 50, that is, all second pixels 41 in a second pixel set 40 share a second driving circuit 50. A second driving circuit 50 can be used to drive all second pixels 41 in a second pixel set 40 to emit light and display. The number of second driving circuits 50 is less than the number of second pixels 41. The second driving circuit 50 includes an opaque structure. Therefore, reducing the number of second driving circuits 50 set in the second display area AA2 can help improve the transmittance of the second display area AA2.

[0059] It should be noted that, as the number of the second pixels 41 in the second pixel set 40 increases, the driving capability of the second driving transistor included in the second driving circuit 50 needs to be greater, so that the size of the second driving transistor also needs to be larger.

[0060] In some examples, the structures of the first pixel 20 and the second pixel 41 may be the same. For example, it can be understood that the first pixel 20 and the second pixel 41 have the same size.

[0061] In some examples, the first pixels 20 may be arranged in the form of RGBG.

[0062] In some examples, the shape of the first pixel 20 may be, but is not limited to, a circle, an ellipse, or a polygon. The shape of the second pixel 41 may be, but is not limited to, a circle, an ellipse, or a polygon.

[0063] In some examples, in one second pixel set 40 , two or more second pixels 41 of the same color are connected in parallel.

[0064] In some examples, the second pixel 41 may include a first electrode, a light-emitting layer, and a second electrode. The first electrode may serve as an anode. The second electrode may serve as a cathode. The light-emitting layer is disposed between the first electrode and the second electrode. In a second pixel set 40, the first electrodes of two or more second pixels 41 are connected in parallel via an interconnect structure. For example, the interconnect structure may be a transparent conductive structure. For example, the material of the transparent conductive structure may include, but is not limited to, indium tin oxide (ITO), thereby facilitating improved light transmittance of the second display area AA2.

[0065] The second driving circuit 50 is configured to output a driving current. The second pixels 41 receive the driving current to achieve luminous display. Since the second pixels 41 in a second pixel set 40 are connected in parallel, the driving current output by the second driving circuit 50 is the sum of the driving currents required by the second pixels 41. The parallel connection of the second pixels 41 does not change the driving voltage of the second driving circuit 50.

[0066] Figure 5 The equivalent circuit of the second driving circuit of the present application is schematically shown. Figure 5 As shown, in the embodiment of the present application, the second driving circuit 50 includes a second driving transistor 51. The second driving transistor 51 is used to output a driving current. One second driving circuit 50 includes two or more second driving transistors 51 connected in parallel. The number of second pixels 41 in one second pixel set 40 is equal to the number of second driving transistors 51 in one second driving circuit 50, so that the driving current output by one second driving transistor 51 can be equal to the driving current required by one second pixel 41. The driving current output by the second driving circuit 50 is the sum of the driving currents output by the two or more second driving transistors 51 included therein.

[0067] In an embodiment of the present application, two or more second drive transistors 51 connected in parallel are provided in the second drive circuit 50, and the number of the second drive transistors 51 is the same as the number of the second pixels 41 in a second pixel set 40, so that the second drive transistors 51 and the second pixels 41 are provided in a one-to-one correspondence. Therefore, the sum of the drive currents output by each second drive transistor 51 can be equal to the sum of the drive currents required by each second pixel 41. When the drive current required by a first pixel 20 is equal to the drive current required by a second pixel 41, the drive current output by a first drive transistor can be equal to the drive current output by a second drive transistor 51, so that the channel ratio of the first drive transistor can be the same as the channel ratio of the second drive transistor 51. The transfer characteristic curve of the first drive transistor can be the same as the transfer characteristic curve corresponding to the second drive transistor 51. When the voltage drops (IRdrop) of the power supply signals VDD / VSS are the same, the corresponding falling currents of the first driving transistor and the second driving transistor 51 having the same channel ratio can maintain good consistency, effectively reducing the possibility of differences in display brightness between the first display area AA1 and the second display area AA2, ensuring the brightness uniformity and consistency of the first display area AA1 and the second display area AA2, and improving the display effect of the display panel 10.

[0068] Since the display effects of the first display area AA1 and the second display area AA2 are slightly different, the position of the second display area AA2 can be flexibly selected. For example, the second display area AA2 can be set in the middle area of ​​the display panel 10, or the second display area AA2 can be set at the lower end of the display panel 10.

[0069] In some embodiments, the first driving transistor includes a source, a drain, and a gate. The first driving transistor can be turned on according to the gate control signal, thereby forming a closed loop to provide a driving current to the first pixel 20, which can then drive the first pixel 20 to emit light and display. It should be noted that the first driving transistor can be a field effect transistor. The first driving transistor can be a P-type transistor. After the gate of the first driving transistor receives a low-level signal, the source and drain of the first driving transistor can be turned on. It can be understood that ordinary technicians in this field can easily think of the embodiment of the present application that the first driving transistor can be an N-type transistor without making creative work. After the gate of the first driving transistor receives a high-level signal, the source and drain of the first driving transistor can be turned on.

[0070] In some embodiments, the first driving circuit 30 may be 7T1C, 5T1C or 2T1C, which is not limited in this application.

[0071] In some embodiments, the second driving transistor 51 includes a source, a drain, and a gate. The second driving transistor 51 can be turned on according to the gate control signal, thereby forming a closed loop to provide a driving current, thereby enabling the second driving circuit 50 to drive the second pixel 41 to emit light and display. It should be noted that the second driving transistor 51 can be a field effect transistor. The second driving transistor 51 can be a P-type transistor. After the gate of the second driving transistor 51 receives a low-level signal, the source and drain of the second driving transistor 51 can be turned on. It can be understood that ordinary technicians in this field can easily think of the embodiment of the present application that the second driving transistor 51 can be an N-type transistor without making any creative work. After the gate of the second driving transistor 51 receives a high-level signal, the source and drain of the second driving transistor 51 can be turned on.

[0072] In some embodiments, see Figure 5 As shown, the second driving circuit 50 also includes a signal writing module 52. The signal writing module 52 is shared by more than two second driving transistors 51. The signal writing module 52 is used to write a data signal into the gate of the second driving transistor 51. The signal writing module 52 is used to be electrically connected to the data signal line (DATA). The data signal on the data signal line can be written into the gate of the second driving transistor 51 through the signal writing module 52. The signal writing module 52 can accurately control the conduction or cutoff of the second driving transistor 51, thereby improving the control accuracy. The second driving circuit 50 can receive the data signal input by the data signal line according to the connectivity state of the signal writing module 52, so as to provide a driving current to the second pixel 41.

[0073] In some examples, the signal writing module 52 may include a switching transistor T1. For example, when the gate drive signal GATE on the gate of the switching transistor T1 is at a high level, the switching transistor T1 may be turned on. The data signal line may write a data signal to the gate of the second driving transistor 51 through the signal writing module 52. When the gate drive signal GATE on the gate of the switching transistor T1 is at a low level, the switching transistor T1 may be turned off. The data signal line may not write a data signal to the gate of the second driving transistor 51 through the signal writing module 52. In some examples, the switching transistor T1 may be a P-type transistor or an N-type transistor, which is not limited in this application.

[0074] Because two or more second driver transistors 51 share the signal writing module 52, the number of signal writing modules 52 in the second driver circuit 50 can be reduced, thereby reducing the structural complexity of the second driver circuit 50 of the present application. In the embodiment where the second driver circuit 50 is disposed in the second display area AA2, due to the small number of signal writing modules 52, the second driver circuit 50 includes a small number of opaque components (e.g., transistors), which can help improve the transmittance of the second display area AA2. In the embodiment where the second driver circuit 50 is disposed in the first display area AA1, due to the small number of signal writing modules 52, the space occupied by the second driver circuit 50 in the first display area AA1 can be reduced.

[0075] In some embodiments, see Figure 5 As shown, the second driving circuit 50 also includes an initialization module 53. The initialization module 53 is shared by more than two second driving transistors 51. The initialization module 53 is used to transmit a reference voltage signal to the gate of the second driving transistor 51. The initialization module 53 is used to be electrically connected to the scanning signal line. The initialization module 53 can control whether the second driving transistor 51 and the first electrode in the second pixel 41 are connected to the reference voltage input terminal Vref according to the scanning signal line, thereby realizing the operation of initializing the potential of the gate of the second driving transistor 51 and the first electrode in the second pixel 41, so that the gate voltage of the second driving transistor 51 is more accurate when working, and at the same time, it can avoid the situation where leakage current occurs in the first electrode due to different light-emitting voltages between adjacent pixels of different colors.

[0076] In some examples, the initialization module 53 includes a switch transistor. When the switch transistor is turned on, the reference voltage signal can be input to the first electrode of the second pixel 41 and the gate of the second driving transistor 51 at the same time.

[0077] In some examples, the initialization module 53 includes a switching transistor T2 and a switching transistor T3. The gates of the switching transistors T2 and T3 are electrically connected to the scan signal line. One end of the switching transistors T2 and T3 is electrically connected to the reference voltage input terminal Vref. For example, during the initialization phase, when a low-level signal is input to the scan signal line, the switching transistors T2 and T3 are turned on.

[0078] The reference voltage signal inputted by the reference voltage input terminal Vref is transmitted to the gate of each second driving transistor 51 through the switching transistor T2, thereby initializing the second driving transistor 51 with the reference voltage. Accordingly, the reference voltage signal inputted by the reference voltage input terminal Vref can be transmitted to the first electrode of the second pixel 41 through the switching transistor T3, thereby initializing the second pixel 41 with the reference voltage signal.

[0079] Because two or more second driver transistors 51 share the initialization module 53, the number of initialization modules 53 in the second driver circuit 50 can be reduced, thereby further reducing the structural complexity of the second driver circuit 50 of the present application. In the embodiment where the second driver circuit 50 is disposed in the second display area AA2, the small number of initialization modules 53 means that the second driver circuit 50 includes fewer opaque components (e.g., transistors), which can help improve the light transmittance of the second display area AA2. In the embodiment where the second driver circuit 50 is disposed in the first display area AA1, the small number of initialization modules 53 can help reduce the space occupied by the second driver circuit 50 in the first display area AA1.

[0080] In some embodiments, see Figure 5 As shown, the second driving circuit 50 also includes a capacitor 54. The gates of the two or more second driving transistors 51 are electrically connected to the capacitor 54. One end of the capacitor 54 can be connected to the gate of the second driving transistor 51. The other end of the capacitor 54 can be connected to the power supply voltage output terminal VDD. When the switching transistor T3 is turned on, the voltage of the first electrode of the second pixel 41 is set to the reference voltage, thereby initializing the potential of the first electrode of the second pixel 41. When the switching transistor T2 is turned on, the voltage at one end of the capacitor 54 is set to the reference voltage, thereby clearing the potential stored at the end. The gate voltage of the second driving transistor 51 is the reference voltage.

[0081] Because two or more second drive transistors 51 share a capacitor 54, the number of capacitors 54 in the second drive circuit 50 can be reduced, thereby further reducing the structural complexity of the second drive circuit 50 of the present application. In the embodiment where the second drive circuit 50 is disposed in the second display area AA2, the small number of capacitors 54 means that the second drive circuit 50 includes fewer opaque components, which can help improve the light transmittance of the second display area AA2. In the embodiment where the second drive circuit 50 is disposed in the first display area AA1, the small number of capacitors 54 can help reduce the space occupied by the second drive circuit 50 in the first display area AA1.

[0082] Figure 6 The partial structure of the second pixel set 40 and the second driving circuit 50 of the present application is schematically shown. In some embodiments, see Figure 3 and Figure 6As shown, the second driving circuit 50 can be located in the second display area AA2. A second driving circuit 50 can be disposed below each second pixel set 40. This can help reduce the distribution density of the second driving circuits 50, thereby reducing the possibility of light diffraction, reflection, and refraction resulting in chaotic light caused by a high local density of second driving circuits 50.

[0083] In some examples, one second pixel set 40 may include four second pixels 41. The four second pixels 41 share one second driving circuit 50. One second driving circuit 50 includes four second driving transistors 51 connected in parallel.

[0084] In some examples, in a second pixel set 40, a second driving transistor 51 is disposed below a corresponding second pixel 41. The second driving transistors 51 are dispersedly arranged below the corresponding second pixels 41, thereby reducing the distribution density of the second driving transistors 51 and reducing the possibility of local transmittance deviation in the second display area AA2 caused by excessive concentration of the opaque second driving transistors 51.

[0085] For some examples, see Figure 6 As shown, in a second pixel set 40, a second driving transistor 51, a shared signal writing module 52, an initialization module 53, and a shared capacitor 54 are disposed under one second pixel 41, while only one second driving transistor 51 is disposed under each of the other second pixels 41 in the second pixel set 40. It is understood that the components in the signal writing module 52 and the initialization module 53 are switching transistors.

[0086] Conventional process technology can be used to form the second driving transistor 51, the shared switching transistor and the shared capacitor 54 under one second pixel 41, and the second driving transistor 51 can be formed under other second pixels 41, which helps to reduce the processing difficulty of the second driving circuit 50.

[0087] Figure 7 The partial structure of the display panel 10 of the present application is schematically shown. In some embodiments, see Figure 7 As shown, in the second display area AA2, first signal lines 60 are provided between two or more second drive circuits 50. The first signal lines 60 are used to electrically connect different second drive circuits 50. The first signal lines 60 are transparent, which helps reduce the possibility of light being blocked or reflected by the first signal lines 60, thereby improving the light transmittance of the second display area AA2.

[0088] In some examples, the first signal line 60 includes at least one of an indium tin oxide thin film trace and an indium zinc oxide thin film trace.

[0089] In some embodiments, see Figure 7 As shown, a second signal line 70 is disposed between the first drive circuit 30 and the second drive circuit 50. The second signal line 70 is used to electrically connect the first drive circuit 30 and the second drive circuit 50. The second signal line 70 is a transparent line. This helps reduce the possibility of light being blocked or reflected by the portion of the second signal line 70 located in the second display area AA2, thereby improving the light transmittance of the second display area AA2. In some examples, the second signal line 70 includes at least one of an indium tin oxide thin film line and an indium zinc oxide thin film line.

[0090] In some examples, the first signal line 60 and the second signal line 70 are disposed at different layers. The display panel 10 includes a first metal layer (M1), a second metal layer (M2), and a third metal layer (M3).

[0091] Illustratively, in the preparation process of the array film layer of the display panel 10, along the stacking direction of the array film layer of the display panel 10, the first metal layer (M1), the first signal line 60, the second metal layer (M2), the second signal line 70 and the third metal layer (M3) are prepared and formed in sequence.

[0092] Alternatively, in the preparation process of the array film layer of the display panel 10, the first metal layer (M1), the second metal layer (M2), the third metal layer (M3), the first signal line 60 and the second signal line 70 are prepared and formed in sequence along the stacking direction of the array film layer of the display panel 10. The specific adjustments can be made according to actual conditions and are not limited here.

[0093] In some embodiments, at least part of the second driving circuit 50 may be located in the first display area AA1, thereby further reducing the number and occupied space of the second driving circuit 50 in the second display area AA2, which is beneficial to improving the transmittance of the second display area AA2.

[0094] In some examples, all of the second driving circuits 50 are located in the first display area AA1 .

[0095] Figure 8 The partial structure of the display panel 10 of the present application is schematically shown. In some examples, see Figure 8 As shown, the first display area AA1 includes a first sub-display area AA11 and a second sub-display area AA12. The second sub-display area AA12 is located between the first sub-display area AA11 and the second display area AA2. At least part of the second driving circuit 50 is located in the second sub-display area AA12.

[0096] In some examples, the size of the first pixel 20 of the first sub-display area AA11 is the same as the size of the first pixel 20 of the second sub-display area AA12, which is beneficial to reducing the display difference between the first sub-display area AA11 and the second sub-display area AA12 and improving display uniformity.

[0097] The present application also provides a display device comprising the display panel 10 of the above embodiment. The display device further comprises a photosensitive element. The photosensitive element may be disposed below the second display area AA2. The display device of the present application may be a display device such as a mobile phone, tablet, laptop, or television.

[0098] In some embodiments, the photosensitive element can be a light sensor such as a camera module, an infrared sensor, a proximity sensor, a fingerprint recognition sensor, and an ambient light sensor.

[0099] In some embodiments, the display device includes a circuit board. The circuit board may be a mainboard of the display device. A processor may be integrated on the circuit board. The display panel 10 and the photosensitive element are both electrically connected to the circuit board. The display panel 10 and the photosensitive element can be controlled by the circuit board. When the photosensitive element needs to be turned on, the processor receives an instruction and can control the second display area AA2 to be in an off state, so that the second pixel 41 does not emit light, and external light can reach the photosensitive element through the second display area AA2. When the photosensitive element does not need to be turned on, the processor receives an instruction and can control the first display area AA1 and the second display area AA2 to emit light and display at the same time to achieve a full-screen display effect.

[0100] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0101] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: The display panel includes a first display area and a second display area, wherein the transmittance of the second display area is greater than the transmittance of the first display area, and the display panel includes: a first pixel, located in the first display area; A first driving circuit is located in the first display area, the first driving circuit is used to drive the first pixel to display, and the first driving circuit includes a first driving transistor; a second pixel set located in the second display area, each second pixel set including two or more second pixels connected in parallel; a second driving circuit, wherein the second pixels in one second pixel set share one second driving circuit, and one second driving circuit includes two or more second driving transistors connected in parallel; The number of the second pixels in one second pixel set is equal to the number of the second driving transistors in one second driving circuit, the second driving transistors are arranged in a one-to-one correspondence with the second pixels, and the channel ratio of the first driving transistor is the same as the channel ratio of the second driving transistor; The second driving circuit further includes an initialization module, which is shared by more than two second driving transistors and is configured to transmit a reference voltage signal to a gate of the second driving transistor.

2. The display panel according to claim 1, wherein: The second driving circuit further includes a signal writing module. The two or more second driving transistors share the signal writing module, and the signal writing module is used to write a data signal into the gate of the second driving transistor.

3. The display panel according to claim 1, wherein: The initialization module is further configured to transmit a reference voltage signal to the first electrode of the second pixel.

4. The display panel according to claim 1, wherein: The second driving circuit further includes a capacitor, and the gates of the two or more second driving transistors are electrically connected to the capacitor.

5. The display panel according to any one of claims 1 to 4, characterized in that: The second driving circuit is located in the second display area, and one second driving circuit is correspondingly disposed below one second pixel set.

6. The display panel according to claim 5, wherein: In a second pixel set, a second driving transistor is correspondingly disposed below a second pixel.

7. The display panel according to claim 5, wherein: A first signal line is provided between two or more second driving circuits. The first signal line is used to electrically connect different second driving circuits. The first signal line is a transparent line.

8. The display panel according to claim 7, wherein: The first signal line includes at least one of an indium tin oxide thin film line and an indium zinc oxide thin film line.

9. The display panel according to claim 5, wherein: A second signal line is provided between the first driving circuit and the second driving circuit. The second signal line is used to electrically connect the first driving circuit and the second driving circuit. The second signal line is a transparent line.

10. The display panel according to claim 9, wherein: The second signal line includes at least one of an indium tin oxide thin film line and an indium zinc oxide thin film line.

11. The display panel according to any one of claims 1 to 4, characterized in that: At least a portion of the second driving circuit is located in the first display area.

12. The display panel according to claim 11, wherein: The first display area includes a first sub-display area and a second sub-display area, the second sub-display area is located between the second display area and the first sub-display area, and at least a portion of the second driving circuit is located in the second sub-display area.

13. A display device, characterized in that: include: The display panel according to any one of claims 1 to 12; The photosensitive element is arranged below the second display area.

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