Display panel and display device

Abstract

Embodiments of the present application relate to a display panel and a display device, the display panel comprising: a plurality of pixel units, each pixel unit comprising a plurality of light emitting devices; a plurality of driving wires; a plurality of driving circuits, each of the plurality of driving circuits being connected to one of the plurality of light emitting devices through one of the plurality of driving wires, each driving circuit being configured to output a driving signal to an anode of the connected light emitting device; wherein the length of the driving wire of each light emitting device in the same pixel unit is negatively correlated with the light-on duration of the light emitting device, and the driving wire is a wire connected between the output end of the driving circuit and the anode of the light emitting device. By adjusting the length of the driving wire of each light emitting device, the transmission duration of the driving signal to each light emitting device can be changed accordingly, thereby providing a display panel with accurate color and better display effect.

Description

Technical Field

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

[0002] With the continuous development of science and technology, electronic devices are emerging in an endless stream, bringing great convenience to people's daily lives and entertainment. Currently, electronic devices are constantly developing towards larger screens, and in order to increase the screen-to-body ratio of electronic devices and truly achieve a full-screen display, under-display camera technology has attracted much attention.

[0003] An under-display camera divides the display of an electronic device into a main screen area and a secondary screen area, with the secondary screen area being the area where the under-display camera is placed. Since the light-emitting devices in the secondary screen area are typically located within the camera's field of view, while the driving circuitry for these devices is placed on the periphery of the secondary screen area and connected to the devices via metal traces, different metal traces can generate varying degrees of RC delay (RC loading). This can lead to color shift issues in the secondary screen area, significantly reducing the display quality of the electronic device. Summary of the Invention

[0004] This application provides a display panel and a display device that can improve the color shift problem of the display panel, thereby improving the display effect.

[0005] A display panel, comprising:

[0006] Multiple pixel units, each of which includes multiple light-emitting devices;

[0007] Multiple drive traces;

[0008] Multiple driving circuits are provided, and the multiple driving circuits are respectively connected to the multiple light-emitting devices one by one through multiple driving lines. Each driving circuit is used to output a driving signal to the anode of the connected light-emitting device.

[0009] In this context, the length of the driving trace of each light-emitting device in the same pixel unit is negatively correlated with the lighting duration of the light-emitting device, and the driving trace is the trace connecting the output terminal of the driving circuit and the anode of the light-emitting device.

[0010] A display device includes: a photosensitive element and a display panel as described above; wherein the photosensitive element is disposed corresponding to the light-transmitting area of ​​the display panel.

[0011] The aforementioned display panel and display device, wherein the display panel includes: a plurality of pixel units, each pixel unit including a plurality of light-emitting devices; a plurality of driving circuits, each connected to one of the plurality of light-emitting devices, each driving circuit being used to output a driving signal to the anode of the connected light-emitting device; wherein the length of the driving trace of each light-emitting device in the same pixel unit is negatively correlated with the on-time of the light-emitting device, and the driving trace is a trace connecting the output terminal of the driving circuit and the anode of the light-emitting device.

[0012] In this embodiment, multiple light-emitting devices in the same pixel unit need to light up at the same time to jointly achieve the required color and brightness for the pixel unit. By adjusting the length of the driving traces for each light-emitting device, the transmission time of the driving signal to each light-emitting device can be changed accordingly. It is understood that the total lighting time required from the output of the driving signal from the driving circuit to the lighting of the corresponding light-emitting device is the sum of the transmission time and the lighting time. Therefore, different lighting times can be compensated for based on different transmission times, thereby ensuring that the total lighting time of each light-emitting device in the same pixel unit is the same, thus ensuring that the pixel unit can present accurate color and brightness. In other words, this embodiment provides a display panel with accurate color and superior display effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a partial structural diagram of a display device according to one embodiment;

[0015] Figure 2 This is a schematic diagram of the structure of a display panel according to one embodiment;

[0016] Figure 3 This is a partially enlarged view of the light-emitting device and driving circuit of one embodiment;

[0017] Figure 4 This is a cross-sectional schematic diagram of a driving circuit according to one embodiment;

[0018] Figure 5 This is a schematic diagram of the structure of the light-transmitting area, the first sub-external area, and the second sub-external area in one embodiment;

[0019] Figure 6 This is one of the structural schematic diagrams of the light-transmitting area, the first outer area, and the second outer area in one embodiment;

[0020] Figure 7 This is a second schematic diagram of the structure of the light-transmitting area, the first outer area, and the second outer area in one embodiment;

[0021] Figure 8 This is a schematic diagram of the pixel arrangement in the light-transmitting area according to one embodiment;

[0022] Figure 9 for Figure 8 A schematic diagram of the lighting timing of multiple color light-emitting devices in the embodiment;

[0023] Figure 10 This is one of the schematic diagrams of a drive routing method according to an embodiment;

[0024] Figure 11 This is a second schematic diagram of a driving routing method according to one embodiment;

[0025] Figure 12 This is a circuit diagram of a driving circuit according to one embodiment.

[0026] Component designation explanation:

[0027] Display panel: 10; Light-transmitting area: 11; First pixel area: 11a; Second pixel area: 11b; External area: 12; First external area: 121; Second external area: 122; First sub-external area: 12a; Second sub-external area: 12b; Third sub-external area: 12c; Fourth sub-external area: 12d; Pixel unit: 100; Light-emitting device: 110; First light-emitting device: 110a; Second light-emitting device: 110b; Third light-emitting device: 110c; Driving circuit: 210; First driving circuit: 210a; Second driving circuit: 210a; Drive circuit: 210b; Third drive circuit: 210c; Gate: 2101; Source: 2102; Drain: 2103; Source contact structure: 2104; Drain contact structure: 2105; Anode reset unit: 211; Gate reset unit: 212; Data writing unit: 213; Threshold compensation unit: 214; Light emission control unit: 215; Substrate: 311; Buffer layer: 312; Gate insulating layer: 313; Interlayer insulating layer: 314; Planarization layer: 315; Pixel definition layer: 316; Photosensitive device: 20. Detailed Implementation

[0028] To facilitate understanding of the embodiments of this application, a more comprehensive description of the embodiments of this application will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the embodiments of this application. However, the embodiments of this application can be implemented in many different forms and are not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the embodiments of this application more thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of this application belong. The terminology used herein in the description of embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the method or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0031] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first direction may be referred to as a second direction, and similarly, a second direction may be referred to as a first direction. Both the first direction and the second direction are directions, but they are not the same direction.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise expressly and specifically defined.

[0033] Figure 1 This is a partial structural diagram of a display device according to one embodiment. The display device can be a smartphone, tablet computer, gaming device, augmented reality (AR) device, laptop, desktop computing device, wearable device, etc. For ease of understanding, a mobile phone is used as an example for the following illustration. (Reference) Figure 1 In this embodiment, the display device includes a display panel 10 and a photosensitive device 20.

[0034] The display panel 10 includes an adjacent light-transmitting area 11 and an outer area 12. The shape of the light-transmitting area 11 can be circular, rectangular, elliptical, polygonal, irregular, etc., and this invention is not limited thereto. The shape of the outer area 12 can also be annular, rectangular, etc., and this invention is not limited thereto. The photosensitive device 20 is at least partially disposed corresponding to the light-transmitting area 11. Exemplarily, the photosensitive device 20 can be disposed below the light-transmitting area 11, and the photosensitive device 20 is used to emit and / or receive optical signals through the light-transmitting area 11 of the display panel 10. That is, the light-transmitting area 11 is the area located above the photosensitive device 20. It should be noted that in this embodiment, "above" refers to the direction from the back cover of the display device to the display screen, and "below" refers to the direction from the display screen to the back cover.

[0035] The photosensitive device 20 achieves testing and control based on optical parameters by receiving light. The photosensitive device 20 can be a camera, or it can be an ambient light sensor, an optical distance sensor (e.g., an infrared sensor, laser sensor, proximity sensor, distance sensor, optical distance sensor), a structured light module, a time-of-flight (TOF) lens module, an optical fingerprint sensor, etc.

[0036] For ease of explanation, the embodiments of this application use a camera as an example for the photosensitive device 20. It is understood that the driving circuit is typically formed in multiple stacked functional layers, which can reduce the intensity of incident light from the camera and even cause diffraction problems in imaging, significantly affecting the image quality. Therefore, for under-display camera solutions, by externalizing the driving circuit of the pixels in the display area corresponding to the camera within that display area, image quality can be effectively improved, thereby enhancing the user experience.

[0037] Figure 2 This is a schematic diagram of the structure of a display panel 10 according to one embodiment, with reference to... Figure 2 In this embodiment, the display panel 10 includes multiple pixel units 100, multiple driving lines L, and multiple driving circuits.

[0038] Specifically, Figure 2This embodiment illustrates two pixel units 100 in a display panel 10, each pixel unit 100 including multiple light-emitting devices (i.e., diodes in the figure). The number of light-emitting devices in each pixel unit 100 can be 2, 3, 4, etc., specifically determined according to the desired display effect. For example, if the display panel 10 needs to achieve richer colors or a larger color gamut, a larger number of light-emitting devices 110 can be provided, such as each pixel unit 100 including 4 light-emitting devices of different colors. It is understood that the above quantities are for illustrative purposes only and are not intended to limit the scope of protection of this embodiment. For simplicity, this embodiment uses two light-emitting devices as an example, named the first light-emitting device 110a and the second light-emitting device 110b.

[0039] Multiple driving circuits are connected one-to-one with multiple light-emitting devices, and each driving circuit is used to output a driving signal to the anode of the connected light-emitting device. Corresponding to a pixel unit 100 including two light-emitting devices, the display panel 10 of this embodiment includes two driving circuits: a first driving circuit 210a and a second driving circuit 210b. The first driving circuit 210a is connected to the anode of the first light-emitting device 110a, and the second driving circuit 210b is connected to the anode of the second light-emitting device 110b, to output driving signals to the corresponding light-emitting devices. For ease of explanation, in various embodiments of this application, the trace connecting the output terminal of the driving circuit to the anode of the light-emitting device is defined as a driving trace.

[0040] For example, taking a first light-emitting device 110a as a red light-emitting device and a second light-emitting device 110b as a green light-emitting device as an example, the color shift problem in the related art will be explained. If the two light-emitting devices light up at the same time, the pixel unit 100 will display yellow. If the red light-emitting device lights up before the green light-emitting device, the pixel unit 100 will display red before the green light-emitting device lights up. If the green light-emitting device lights up before the red light-emitting device, the pixel unit 100 will display green before the red light-emitting device lights up. It can be seen that if the lighting times of multiple light-emitting devices in the same pixel unit 100 are different, it will affect the color displayed by the pixel unit 100, thereby causing the color shift problem of the display panel 10. Therefore, multiple light-emitting devices in the same pixel unit 100 need to light up at the same time to jointly achieve the color and brightness required by the pixel unit 100. It is important to emphasize that "the same time" is not limited to exactly the same time. If the difference between the lighting times of any two light-emitting devices in the same pixel unit 100 is less than a preset threshold, it can be understood that they are lighting up at the same time. This preset threshold can be, for example, 0.01ms. Here, the lighting time refers to the time when the light-emitting device reaches a stable target brightness, and the display driver chip determines the target brightness of each light-emitting device according to the image to be displayed.

[0041] Figure 3 This is a partial enlarged view of the light-transmitting area and the outer area of ​​one embodiment, with reference to... Figure 3 The first driving circuit 210a located in the outer region 12 can be electrically connected to the first light-emitting device 110a located in the light-transmitting region 11 via the driving trace L. Correspondingly, the second driving circuit 210b located in the outer region 12 can also be electrically connected to the second light-emitting device 110b located in the light-transmitting region 11 via the driving trace L. (Reference) Figure 3 It can be observed that the lengths of the driving traces are not entirely the same. In this embodiment, the length of the driving trace for each light-emitting device in the same pixel unit 100 is negatively correlated with the on-time of the light-emitting device; that is, the longer the on-time of the light-emitting device, the shorter the trace length connecting the light-emitting device to the corresponding driving circuit. The driving trace L can be a transparent metal line, such as an indium tin oxide (ITO) metal line or an aluminum zinc oxide (AZO) metal line. It is understood that the shape and position of the external region 12 in this embodiment are for illustrative purposes only and are not intended to limit the scope of protection of the external region of this application.

[0042] Figure 4 This is a cross-sectional schematic diagram of a driving circuit according to one embodiment. Figure 4 The cross-sectional direction is perpendicular to the display surface of the display panel 10. (Reference) Figure 4In this embodiment, the substrate may include a polyimide (PI) substrate 311 and a buffer layer 312 arranged alternately in sequence. Figure 4 In the illustrated embodiment, the substrate includes two polyimide (PI) substrates 311 and two buffer layers 312 arranged alternately in sequence. It is understood that the substrate may also include a greater number of polyimide (PI) substrates 311 and buffer layers 312. Two gate insulating layers 313 (GI1 layer and GI2 layer), an interlayer insulating layer 314, a planarization layer 315, and a pixel definition layer 316 are also disposed on the substrate. The aforementioned first driving circuit 210a and second driving circuit 210b are also formed in the gate insulating layer 313, the interlayer insulating layer 314, and the planarization layer 315. Specifically, the first driving circuit 210a includes a gate 2101, a source 2102, a drain 2103, a source contact structure 2104, and a corresponding drain contact structure 2105. The anode layer in the first light-emitting device 110a is electrically connected to the source 2102 via a driving trace L. The second driving circuit 210b may also include a gate 2101, a source 2102, a drain 2103, a source contact structure 2104, and a drain contact structure 2105. The anode layer in the second light-emitting device 110b is also electrically connected to the corresponding source 2102 through the driving line L.

[0043] Reference Figure 3 and Figure 4 Because the light-emitting devices 110 are located at different positions in the light-transmitting area 11, and the corresponding driving circuits for each light-emitting device are also located at different positions, the lengths of the driving traces are different. Furthermore, any driving trace will couple with other traces, resulting in RC loading, which reduces the transmission speed of the driving signal on the driving trace. It is understandable that for some light-emitting devices with longer start-up times, RC loading will further delay their start-up time and cause color distortion. Therefore, in this embodiment, by adjusting the length of the driving traces for each light-emitting device, the transmission time of the driving signal to each light-emitting device can be changed accordingly. It is understood that the total lighting time required from the output of the driving signal from the driving circuit to the start-up of the corresponding light-emitting device is the sum of the transmission time and the start-up time. Therefore, different start-up times can be compensated for based on different transmission times, so that the total lighting time of each light-emitting device in the same pixel unit is the same, thereby ensuring that the pixel unit can present accurate color and brightness. That is, this embodiment provides a display panel with accurate color and better display effect.

[0044] In this embodiment, the light-emitting devices can be, but are not limited to, organic light-emitting diodes (OLEDs), quantum dot light-emitting diodes (QLEDs), and micro LEDs. It should be noted that each embodiment in this application uses organic light-emitting diodes as an example for illustration. The light-emitting devices can be organic light-emitting diodes of different colors, such as red OLEDs, green OLEDs, and blue OLEDs. The driving circuits for each light-emitting device can be the same, but the light-emitting layer materials of different colors are different, thereby achieving different color displays and enabling the display device to achieve full-color display.

[0045] In one embodiment, each pixel unit includes at least two light-emitting devices of different colors, and the display panel 10 includes a light-transmitting area 11, a first sub-outer area 12a, and a second sub-outer area 12b arranged along a first direction, wherein the first direction is from the center of the light-transmitting area 11 outwards. It should be noted that the light-transmitting area, the first sub-outer area, and the second sub-outer area can all display images.

[0046] Specifically, Figure 5 This is a schematic diagram of the structure of the light-transmitting area 11, the first sub-external area 12a, and the second sub-external area 12b in one embodiment. (Refer to...) Figure 5 In this embodiment, the light-transmitting area 11 is circular in shape, with its center being the center of the circle. Any direction pointing outward from the center along any radius can be considered the first direction. The first sub-outer area 12a is a ring-shaped structure surrounding the light-transmitting area 11, and the second sub-outer area 12b is a ring-shaped structure surrounding the first sub-outer area 12a. In this embodiment, the outer contour of the second sub-outer area 12b is relatively neat, making it easier to design compatiblely with other structures in the display panel 10. These other structures may include, for example, the display pixels of the main screen area. In addition to the light-transmitting area 11, the first sub-outer area 12a, and the second sub-outer area 12b, the display panel 10 also includes a main screen area. This main screen area is also the area that can be used to display images.

[0047] Furthermore, the light-transmitting area 11 is provided with a plurality of pixel units (not shown in the figure). Among the multiple colors in the same pixel unit, the light-emitting device with the longest illumination time is the target light-emitting device, and the driving circuit 210 corresponding to the target light-emitting device is located in the first sub-external area 12a. The driving circuits corresponding to the other light-emitting devices in the same pixel unit are respectively located in the second sub-external area 12b. The illumination time of the light-emitting device is determined by characteristics such as device color, device structure, and target brightness.

[0048] For example, consider a pixel unit comprising a red light-emitting device, a green light-emitting device, and a blue light-emitting device. If a white image with a grayscale of 255 is required to be displayed, all three light-emitting devices (red, green, and blue) need to be illuminated to grayscale 255. However, the target brightness corresponding to grayscale 255 for each light-emitting device is not entirely the same, ensuring the white image has the required color coordinates or color temperature. Corresponding to different target brightness levels, the on-time of each color light-emitting device is also different. Therefore, different drive trace lengths need to be set for different colors of light-emitting devices. In this embodiment, the distance between the first sub-external area 12a and the light-transmitting area 11 is small. Therefore, by placing the drive circuit corresponding to the light-emitting device with the longest on-time in the first sub-external area 12a, the required drive trace length is correspondingly smaller, thereby effectively suppressing the RC loading of the target light-emitting device. Meanwhile, the lighting duration of other light-emitting devices besides the target light-emitting device is relatively short, so a longer drive signal trace can be set to match the total lighting duration of the target light-emitting device, thereby ensuring that the light-emitting devices of each color in the same pixel unit are lit up at the same time.

[0049] It is understood that the color of the target light-emitting device in different pixel units can be different. For example, depending on the arrangement of the light-emitting devices in different display panels, or the size of the light-emitting devices in different pixel units, the target light-emitting device may be any one or two of green, red, and blue light-emitting devices. Specifically, it can be determined based on the pixel arrangement. This embodiment only requires that multiple light-emitting devices in the same pixel unit have the same total illumination time, without specifically limiting the relationship between the total illumination times of different pixel units.

[0050] Figure 6 This is one of the structural schematic diagrams of the light-transmitting area 11, the first outer area 121, and the second outer area 122 in one embodiment, with reference to... Figure 6In this embodiment, the display panel includes a light-transmitting area 11, a first external area 121, and a second external area 122, with the first external area 121 and the second external area 122 located on opposite sides of the light-transmitting area. The light-transmitting area 11 includes a first pixel area 11a and a second pixel area 11b. The first external area 121 is located near the first pixel area 11a, and the second external area 122 is located near the second pixel area 11b. The first pixel area 11a and the second pixel area 11b are each provided with a plurality of pixel units (not shown), and each pixel unit includes at least two light-emitting devices of different colors. The plurality of light-emitting devices located in the first pixel area 11a are connected one-to-one with the plurality of driving circuits located in the first external area 121, and the plurality of light-emitting devices located in the second pixel area 11b are connected one-to-one with the plurality of driving circuits located in the second external area 122. In this embodiment, by connecting the light-emitting devices in the light-transmitting area 11 to one of the first external area 121 and the second external area 122, the driving trace lengths of different light-emitting devices can be further balanced, and the area of ​​a single external area can be reduced, thereby facilitating the arrangement of other signal traces.

[0051] Further reference Figure 6 The first outer region 121 includes a first sub-outer region 12a near the light-transmitting region and a second sub-outer region 12b away from the light-transmitting region. The second outer region 122 includes a third sub-outer region 12c near the light-transmitting region and a fourth sub-outer region 12d away from the light-transmitting region. Among the multiple light-emitting devices in the same pixel unit, the light-emitting device with the longest illumination time is the target light-emitting device. The driving circuit corresponding to the target light-emitting device located in the first pixel region 11a is located in the first sub-outer region 12a. In the first pixel region 11a, the driving circuits corresponding to the remaining light-emitting devices in the same pixel unit as the target light-emitting device are located in the second sub-outer region 12b. The driving circuit corresponding to the target light-emitting device located in the second pixel region 11b is located in the third sub-outer region 12c. In the second pixel region 11b, the driving circuits corresponding to the remaining light-emitting devices in the same pixel unit as the target light-emitting device are located in the fourth sub-outer region 12d. In this embodiment, by setting multiple sub-external areas with different distances from the center of the light-transmitting area, the target light-emitting devices located in different pixel areas can be connected to the corresponding sub-external areas respectively, thereby improving the correspondence between the driving trace length and each light-emitting device, and thus improving the color uniformity of the display panel.

[0052] Figure 7 This is a second schematic diagram of the structure of the light-transmitting area 11, the first outer area 121, and the second outer area 122 in one embodiment, with reference to... Figure 7 In this embodiment, the shape of the light-transmitting area 11 is an axisymmetric figure, and the light-transmitting area 11 is formed by an axis of symmetry (i.e., Figure 7 The area is divided into a first pixel region 11a and a second pixel region 11b by a dashed line. The first pixel region 11a and the first outer region 121 are arranged sequentially along a second direction, and the second pixel region 11b and the second outer region 122 are arranged sequentially along a third direction. The second direction and the third direction are opposite to each other and perpendicular to the axis of symmetry. In this embodiment, by setting two pixel regions and two outer regions with a symmetrical structure, and aligning the axes of symmetry of the two symmetrical structures, the design complexity of the drive traces can be greatly simplified, thereby reducing various signal transmission problems caused by trace design and improving the reliability of the display panel. Furthermore, the first sub-outer region 12a and the third sub-outer region 12c can be symmetrically arranged about the aforementioned axis of symmetry, and the second sub-outer region 12b and the fourth sub-outer region 12d can also be symmetrically arranged about the aforementioned axis of symmetry to improve display uniformity.

[0053] Furthermore, each external region can be rectangular in shape. By using rectangular external regions, multiple driving circuits can be arranged in an array within the external regions. Clearly, compared to... Figure 5 The configuration of this embodiment, including the arrangement of the driving circuit and driving traces, is relatively simple to design and easier to implement. For ease of explanation, subsequent embodiments will be based on... Figure 7 The structure of the embodiments provides further implementation methods.

[0054] Figure 8 This is a schematic diagram of the pixel arrangement of the light-transmitting area 11 according to one embodiment, with reference to... Figure 8In this embodiment, each pixel unit 100 includes two first light-emitting devices 110a, one second light-emitting device 110b, and one third light-emitting device 110c. The two first light-emitting devices 110a are respectively located at the centers of two first vertices of a virtual quadrilateral, and the two first vertices are located on one diagonal of the virtual quadrilateral. The second light-emitting device 110b is separate from the first light-emitting devices 110a, and the second light-emitting device 110b is located at the center of a second vertex of the virtual quadrilateral. The third light-emitting device 110c is separate from both the first light-emitting devices 110a and the first light-emitting device 110c, and the third light-emitting device 110c is located at the center of a third vertex of the virtual quadrilateral, and the second vertex and the third vertex are located on the other diagonal of the virtual quadrilateral. The lighting times of the light-emitting devices in the same pixel unit are not exactly the same. By adopting the above arrangement of light-emitting devices, one light-emitting device can be applied to two adjacent different pixels, thereby achieving shared light-emitting devices and thus achieving a higher display resolution with a smaller number of light-emitting devices.

[0055] Furthermore, the area of ​​the first light-emitting device 110a is smaller than the area of ​​the second light-emitting device 110b and smaller than the area of ​​the third light-emitting device 110c, and the target light-emitting device is the first light-emitting device 110a. It is understood that, as explained above, to achieve the desired white balance effect, the brightness of light-emitting devices with different colors needs to be matched. Therefore, the smaller light-emitting device requires a larger driving current to achieve a relatively larger luminous brightness, so that the user can perceive a normal and balanced display effect. Specifically, the first light-emitting device 110a can be a green light-emitting device, the second light-emitting device 110b can be a red light-emitting device, and the third light-emitting device 110c can be a blue light-emitting device.

[0056] Specifically, Figure 9 for Figure 8 A schematic diagram illustrating the lighting timing of multiple color light-emitting devices in this embodiment. The horizontal axis of the diagram represents time, and the vertical axis represents the brightness of the light-emitting devices. L(R) represents the brightness of the red light-emitting device, L(G) represents the brightness of the green light-emitting device, and L(B) represents the brightness of the blue light-emitting device. (Reference) Figure 9 The lighting process can be divided into three stages: off-light, on-light, and then to stable brightness. Here, 'a' represents the stage from the on-light stage to the stable brightness stage, and 'b' represents the stage from the off-light stage to the stable brightness stage. The stage after the light-emitting device reaches a stable target brightness can be considered the stable brightness stage. Since a white image is composed of red, green, and blue light emitted together, and based on... Figure 8In the pixel arrangement of this embodiment, achieving the desired white light color temperature typically requires the brightness of the green light-emitting device to be greater than that of the red light-emitting device, which in turn is greater than that of the blue light-emitting device. Therefore, the on-time of the green light-emitting device is much longer than that of the red and blue light-emitting devices. Consequently, the RC loading on the green light-emitting device has a much greater impact than that on the red and blue light-emitting devices, resulting in the green light-emitting device's brightness failing to reach the target brightness in time, thus causing the display panel to display purple dark stripes. In this embodiment, by using the green light-emitting device as the target light-emitting device and placing its corresponding first driving circuit in the first sub-external area, the RC loading of the green light-emitting device can be effectively reduced, thereby suppressing the problem of purple dark stripes on the display panel and improving the color rendering quality of the display panel 10.

[0057] Figure 10 This is one of the schematic diagrams of a drive routing method according to an embodiment. (Refer to...) Figure 10 In this embodiment, the eight light-emitting devices shown in the figure are used as an example for explanation. These eight light-emitting devices include two second light-emitting devices 110b (red), four first light-emitting devices 110a (green), and two third light-emitting devices 110c (blue). Specifically, multiple driving circuits located in the same sub-external area are arranged equidistantly in the second direction with a first spacing, and the light-emitting devices correspondingly connected to these driving circuits in the same sub-external area are arranged equidistantly in the second direction with a second spacing, the second spacing being positively correlated with the first spacing. By equidistantly arranging the devices in the same area, the distance between each driving trace can be maximized, thereby effectively suppressing coupling between driving traces, reducing RC loading caused by the driving traces, and improving the display quality of the display panel 10.

[0058] Continue to refer to Figure 10 The first sub-external area 12a may include multiple dummy pixel areas, namely Dummy1 to Dummy4, each dummy pixel area having a predetermined number of driving circuits, and the number of driving circuits in each dummy pixel area is the same. Similarly, the second sub-external area 12b may also include multiple dummy pixel areas, namely Dummy5 to Dummy8, each dummy pixel area having a predetermined number of driving circuits, and the number of driving circuits in each dummy pixel area is the same. It is understood that the number of dummy pixel areas in each sub-external area may correspond to the number of light-emitting devices in the external area 12. That is, the above description of each sub-external area including 4 dummy pixel areas is only for illustrative purposes and is not intended to limit the scope of protection of this application.

[0059] exist Figure 10In this embodiment, among the multiple light-emitting devices of the same color, the driving trace length of the light-emitting device closer to the center of the light-transmitting area 11 is greater than that of the light-emitting device farther from the center of the light-transmitting area 11. Here, "center" can be a center of symmetry, a center of mass, a diagonal center, etc. For example, taking the first light-emitting device 110a as an example, the first driving circuit 210a corresponding to the first light-emitting device 110a closest to the center of the light-transmitting area 11 is located in Dummy 4, and the first driving circuit 210a corresponding to the first light-emitting device 110a farthest from the center of the light-transmitting area 11 is located in Dummy 1. Similarly, the second driving circuit 210b corresponding to the second light-emitting device 110b closest to the center of the light-transmitting area 11 is located in Dummy 8, and the third driving circuit 210c corresponding to the third light-emitting device 110c closest to the center of the light-transmitting area 11 is located in Dummy 7. The total length of all driving traces required by the above method is relatively short, and correspondingly, the area occupied by the driving traces in the display panel 10 is also relatively small. Therefore, the drive routing configuration of this embodiment can be applied to small-volume, lightweight display panels 10.

[0060] Figure 11 This is a second schematic diagram of a drive routing method according to an embodiment, see reference. Figure 11 The setting method of pseudo-pixel area and Figure 10 The embodiments are the same and will not be repeated here. In this embodiment, among the multiple light-emitting devices of the same color, the difference between the driving trace lengths of any two light-emitting devices is less than a preset threshold. That is, taking the first light-emitting device 110a as an example, the first driving circuit 210a corresponding to the first light-emitting device 110a closest to the center of the light-transmitting area 11 is located in the Dummy 1 area, and the first driving circuit 210a corresponding to the first light-emitting device 110a furthest from the center of the light-transmitting area 11 is located in the Dummy 4 area. Similarly, the second driving circuit 210b corresponding to the second light-emitting device 110b furthest from the center of the light-transmitting area 11 is located in the Dummy 7 area, and the third driving circuit 210c corresponding to the third light-emitting device 110c furthest from the center of the light-transmitting area 11 is located in the Dummy 8 area. Figure 10 Compared to the previous embodiment, this embodiment exhibits better uniformity in the RC loading of each driving trace. Consequently, the total illumination time of each emitting pixel is more similar, and color shift issues are significantly suppressed. Therefore, it is also more conducive to subsequent gamma and demura tuning.

[0061] Continue to refer to Figure 11In one embodiment, the second driving circuit 210b of the second light-emitting device 110b and the third driving circuit 210c of the third light-emitting device 110c are alternately spaced. Specifically, the second direction of this embodiment can be parallel to the width direction of the display panel, and the second driving circuit 210b and the third driving circuit 210c are alternately spaced in the second direction. Based on the above connection method, the difference in RC loading between the second light-emitting device 110b and the third light-emitting device 110c can be reduced, thereby improving the matching degree between the second light-emitting device 110b and the third light-emitting device 110c, and thus improving the color display quality of the display panel 10.

[0062] In one embodiment, the number of driving traces required varies depending on the number of light-emitting devices in the light-transmitting area 11. Specifically, when the aperture of the light-transmitting area 11 is small, a single layer of driving traces is sufficient. When the aperture of the light-transmitting area 11 is large, two or three layers of driving traces, or even four layers of driving traces, may be required to avoid the driving traces occupying too large an area in a single layer.

[0063] Figure 12 Here is a circuit diagram of a driving circuit 210 according to one embodiment, refer to Figure 12 In this embodiment, the driving circuit 210 includes a driving transistor T1, an anode reset unit 211, a gate reset unit 212, a data writing unit 213, a threshold compensation unit 214, and a light-emitting control unit 215. Figure 12 The bolded trace is the aforementioned drive trace L.

[0064] Specifically, the driving transistor T1 is used to generate a driving current. The gate of the driving transistor T1 is connected to the gate reset unit 212. The first terminal of the driving transistor T1 is used to receive the data signal Data, and the second terminal of the driving transistor T1 can output the driving current. The value of the driving current is determined by the data signal Data and directly affects the brightness of the light-emitting device 110.

[0065] The control terminal of the anode reset unit 211 is used to receive the second scan signal Scan(n), the input terminal of the anode reset unit 211 is used to receive the reset voltage signal Vinit, and the output terminal of the anode reset unit 211 is connected to the anode of the light-emitting device 110. Specifically, if the driving circuit 210 is the first driving circuit 210a, the output terminal of its anode reset unit 211 is connected to the anode of the first light-emitting device 110a. If the driving circuit 210 is the second driving circuit 210b, the output terminal of its anode reset unit 211 is connected to the anode of the second light-emitting device 110b.

[0066] The anode reset unit 211 receives a reset voltage Vinit via its input terminal after the gate of the driving transistor T1 is reset, and pulls the anode of the connected light-emitting device 110 down to the reset voltage Vinit, thereby resetting the anode of the light-emitting device 110. The reset voltage Vinit can be understood as the initial charging voltage of the anode of the light-emitting device 110. By resetting the anode of the light-emitting device 110, the driving current used to drive the light-emitting device 110 can be redirected to the anode of the light-emitting device 110 to drive it to emit light, without affecting the driving current, thus ensuring the reliability of the light-emitting brightness of the light-emitting device 110.

[0067] The control terminal of the gate reset unit 212 is connected to the gate control terminal and is used to receive the first scan signal Scan(n-1); the input terminal of the gate reset unit 212 is connected to the second reset terminal and is used to receive the reset voltage Vinit; the output terminal of the gate reset unit 212 is connected to the gate of the driving transistor T1. Specifically, the gate reset unit 212 can pull down the gate voltage of the driving transistor T1 to the reset voltage Vinit according to the first scan signal Scan(n-1) received by the control terminal, so as to reset the gate of the driving transistor T1.

[0068] The data writing unit 213 includes a data writing transistor T2. The gate of the data writing transistor T2 is connected to the second scan signal line Scan(n), the first terminal of the data writing transistor T2 is connected to the data signal line, and the second terminal of the data writing transistor T2 is connected to the first terminal of the driving transistor T1. The data writing transistor T2 is used to control the on / off state of the signal transmission path between the second scan signal line and the first terminal of the driving transistor T1 according to the second scan signal Scan(n). Specifically, taking a P-type transistor as an example, when the second scan signal Scan(n) is low, the data writing transistor T2 is turned on and transmits the data signal Data to the first terminal of the driving transistor T1; when the second scan signal Scan(n) is low, the data writing transistor T2 is turned off. It is understood that the data writing unit 213 is not limited to the data writing transistor T2 in this embodiment, and can also be other circuit structures that can realize signal transmission function according to the enable control signal.

[0069] The threshold compensation unit 214 is connected to the gate and the second electrode of the driving transistor T1, respectively, and is used to control the on / off state of the signal transmission path between the gate and the second electrode of the driving transistor T1 according to the second scan signal Scan(n). Specifically, by setting the threshold compensation unit 214, the threshold voltage of the driving transistor T1 can be compensated, thereby avoiding the threshold voltage of the driving transistor T1 from affecting the brightness of the light-emitting device 110.

[0070] The threshold compensation unit 214 includes a threshold compensation transistor T3 and a storage capacitor C1. The storage capacitor C1 is connected to the second power supply voltage terminal VDD and the gate of the driving transistor T1. The gate of the threshold compensation transistor T3 is connected to the first scan signal line, the first terminal of the threshold compensation transistor T3 is connected to the second terminal of the driving transistor T1, and the second terminal of the threshold compensation transistor T3 is connected to the gate of the driving transistor T1. The threshold compensation transistor T3 is used to control the on / off state of the signal transmission path between the gate and the second terminal of the driving transistor T1 according to the second scan signal Scan(n). Specifically, taking a P-type transistor as an example, when the second scan signal Scan(n) is low, threshold compensation is performed and the storage capacitor C1 is charged, thereby storing the compensation result in the storage capacitor C1.

[0071] Optionally, the threshold compensation transistor T3 can be a dual-gate transistor. In this embodiment, the threshold compensation transistor T3 with a dual-gate transistor structure can effectively improve the reliability of threshold compensation, thereby improving the display quality of the display device. It is understood that other transistors in the driving circuit 210 can also be dual-gate transistors to further improve display quality.

[0072] The light-emitting control unit 215 includes a first control transistor T5 and a second control transistor T6. The gate of the first control transistor T5 receives a light-emitting control signal, its first terminal is connected to a second power supply voltage terminal, and its second terminal is connected to the first terminal of a driving transistor T1. The first control transistor T5 controls the on / off state of the signal transmission path between the second power supply voltage terminal and the first terminal of the driving transistor T1 according to the light-emitting control signal EM. The gate of the second control transistor T6 receives the light-emitting control signal EM, its first terminal is connected to the second terminal of the driving transistor T1, and its second terminal is connected to the anode of the light-emitting device 110. The second control transistor T6 controls the on / off state of the signal transmission path between the second terminal of the driving transistor T1 and the anode of the light-emitting device 110 according to the light-emitting control signal EM. For example, taking the first control transistor T5 and the second control transistor T6 as both being P-type transistors, when the light emission control signal EM is low, the first control transistor T5 and the second control transistor T6 are turned on, pulling the voltage of the first terminal of the driving transistor T1 up to the second power supply voltage VDD. The gate-source voltage difference of the first driving transistor T1 changes, thereby generating a driving current and outputting the driving current to the light emission device 110, thereby controlling the light emission device 110 to emit light.

[0073] It should be noted that the various transistors in this embodiment are not limited to the P-type transistors in the aforementioned embodiments, and can also be N-type transistors, etc. Different transistor types can lead to adaptive adjustments in their driving methods. Furthermore, the driving circuit 210 in this embodiment is not limited to the 7T1C driving circuit 210 in the aforementioned embodiments; that is, the driving circuit 210 can also have other numbers of transistors, thereby achieving a lightweight display device with fewer transistors, or achieving more flexible display functions with more transistors. For example, it can also be other types of driving circuits such as 3T1C, 6T1C, 6T2C, etc.

[0074] This application embodiment also provides a method such as Figure 1 The display device shown includes a photosensitive element 20 and a display panel 10 as described above. The photosensitive element 20 is disposed correspondingly to the light-transmitting area 11 of the display panel 10. Based on the aforementioned display panel 10, the display device of this embodiment is less prone to color shift and exhibits high color rendering quality.

[0075] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0076] The above-described embodiments are merely illustrative of several implementation methods of the embodiments of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the embodiments of this application, and these all fall within the protection scope of the embodiments of this application. Therefore, the protection scope of the patent for the embodiments of this application should be determined by the appended claims.

Claims

1. A display panel, characterized in that, include: Multiple pixel units are disposed in the light-transmitting area of ​​the display panel, the light-transmitting area is used to allow ambient light to be incident on the photosensitive device, each pixel unit includes a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device emit light of different colors; the on-time of the first light-emitting device is greater than the on-time of the second light-emitting device; Multiple drive traces; Multiple driving circuits are provided, each driving circuit being connected to a corresponding light-emitting device via multiple driving traces. Each driving circuit is used to output a driving signal to the anode of the connected light-emitting device. The driving traces are traces connecting the output terminal of the driving circuit to the anode of the light-emitting device. The display panel further includes a first sub-outer area and a second sub-outer area arranged along a first direction, the first direction being the direction from the center of the light-transmitting area to the outside of the light-transmitting area. The driving circuit connected to the first light-emitting device is located in the first sub-outer area, and the driving circuit connected to the second light-emitting device is located in the second sub-outer area. Both the first sub-outer area and the second sub-outer area are in a ring structure. The length of the driving trace connected to the first light-emitting device in the same pixel unit is less than the length of the driving trace connected to the second light-emitting device.

2. The display panel according to claim 1, characterized in that, The first light-emitting device emits green light.

3. The display panel according to claim 1, characterized in that, The light-emitting area of ​​the first light-emitting device is smaller than that of the second light-emitting device.

4. The display panel according to claim 1, characterized in that, The light-transmitting area includes a first pixel area and a second pixel area. The display panel also includes a first external area and a second external area located on opposite sides of the light-transmitting area. The first sub-external area and the second sub-external area are disposed in the first external area. The plurality of light-emitting devices located in the first pixel area are connected one-to-one with the plurality of driving circuits located in the first external area, and the plurality of light-emitting devices located in the second pixel area are connected one-to-one with the plurality of driving circuits located in the second external area; The first outer area is closer to the first pixel area than the second outer area, and the second outer area is closer to the second pixel area than the first outer area.

5. The display panel according to claim 4, characterized in that, The second outer area includes a third sub-outer area close to the light-transmitting area and a fourth sub-outer area far from the light-transmitting area; The driving circuit connected to the first light-emitting device located in the second pixel area is located in the third sub-external area, and the driving circuit connected to the second light-emitting device is located in the fourth sub-external area.

6. The display panel according to claim 4, characterized in that, The light-transmitting area is axially symmetric and is divided into a first pixel area and a second pixel area by the axis of symmetry. The first pixel area and the first outer area are arranged sequentially along a second direction, and the second pixel area and the second outer area are arranged sequentially along a third direction. The second direction and the third direction are opposite to each other and are perpendicular to the axis of symmetry.

7. The display panel according to any one of claims 1 to 6, characterized in that, Multiple driving circuits located in the same sub-external area are arranged at equal intervals with a first spacing, and the light-emitting devices correspondingly connected to the multiple driving circuits located in the same sub-external area are arranged at equal intervals with a second spacing, the second spacing being positively correlated with the first spacing.

8. The display panel according to any one of claims 1 to 6, characterized in that, The pixel unit further includes a third light-emitting device, and each pixel unit includes two first light-emitting devices, one second light-emitting device, and one third light-emitting device; The two first light-emitting devices are respectively located at the center of two first vertices of the virtual quadrilateral, and the two first vertices are located on one diagonal of the virtual quadrilateral; the second light-emitting device is separate from the first light-emitting device, and the second light-emitting device is located at the center of a second vertex of the virtual quadrilateral; the third light-emitting device is separate from the first light-emitting device and the second light-emitting device, and the third light-emitting device is located at the center of a third vertex of the virtual quadrilateral, and the second vertex and the third vertex are located on another diagonal of the virtual quadrilateral.

9. The display panel according to claim 8, characterized in that, The area of ​​the first light-emitting device is smaller than the area of ​​the second light-emitting device and smaller than the area of ​​the third light-emitting device.

10. The display panel according to claim 8, characterized in that, The second light-emitting device is a red light-emitting device, and the third light-emitting device is a blue light-emitting device. The driving circuits for the red light-emitting device and the blue light-emitting device are alternately arranged.

11. A display panel, characterized in that, include: Multiple pixel units are disposed in the light-transmitting area of ​​the display panel, the light-transmitting area is used to allow ambient light to be incident on the photosensitive device, each pixel unit includes a first light-emitting device and a second light-emitting device, the first light-emitting device and the second light-emitting device emit light of different colors; the on-time of the first light-emitting device is greater than the on-time of the second light-emitting device; Multiple drive traces; Multiple driving circuits are provided, each driving circuit being connected to a corresponding light-emitting device via multiple driving traces. Each driving circuit is used to output a driving signal to the anode of the connected light-emitting device. The driving traces are traces connecting the output terminal of the driving circuit to the anode of the light-emitting device. The display panel further includes a first sub-external area and a second sub-external area arranged along a first direction, the first direction being the direction from the center of the light-transmitting area to the outside of the light-transmitting area, the driving circuit connected to the first light-emitting device being located in the first sub-external area, and the driving circuit connected to the second light-emitting device being located in the second sub-external area. Among the multiple first light-emitting devices, the first light-emitting device that is closer to the center of the light-transmitting area has a driving circuit that is also closer to the center of the light-transmitting area among the multiple driving circuits located in the first sub-external area. The length of the driving trace connected to the first light-emitting device in the same pixel unit is less than the length of the driving trace connected to the second light-emitting device.

12. The display panel according to claim 11, characterized in that, The first light-emitting device emits green light.

13. The display panel according to claim 11, characterized in that, The light-emitting area of ​​the first light-emitting device is smaller than that of the second light-emitting device.

14. The display panel according to claim 11, characterized in that, The light-transmitting area includes a first pixel area and a second pixel area. The display panel also includes a first external area and a second external area located on opposite sides of the light-transmitting area. The first sub-external area and the second sub-external area are disposed in the first external area. A plurality of light-emitting devices located in the first pixel area are connected one-to-one with a plurality of driving circuits located in the first external area. A plurality of light-emitting devices located in the second pixel area are connected one-to-one with a plurality of driving circuits located in the second external area. The first outer area is closer to the first pixel area than the second outer area, and the second outer area is closer to the second pixel area than the first outer area.

15. The display panel according to claim 14, characterized in that, The second outer area includes a third sub-outer area close to the light-transmitting area and a fourth sub-outer area far from the light-transmitting area; The driving circuit connected to the first light-emitting device located in the second pixel area is located in the third sub-external area, and the driving circuit connected to the second light-emitting device is located in the fourth sub-external area.

16. The display panel according to claim 14, characterized in that, The light-transmitting area is axially symmetric and is divided into a first pixel area and a second pixel area by the axis of symmetry. The first pixel area and the first outer area are arranged sequentially along a second direction, and the second pixel area and the second outer area are arranged sequentially along a third direction. The second direction and the third direction are opposite to each other and are perpendicular to the axis of symmetry.

17. The display panel according to any one of claims 11 to 16, characterized in that, The second light-emitting device is a red light-emitting device; the pixel unit further includes a third light-emitting device, and each pixel unit includes two first light-emitting devices, one second light-emitting device, and one third light-emitting device; The two first light-emitting devices are respectively located at the center of two first vertices of the virtual quadrilateral, and the two first vertices are located on one diagonal of the virtual quadrilateral; the second light-emitting device is separate from the first light-emitting device, and the second light-emitting device is located at the center of a second vertex of the virtual quadrilateral; the third light-emitting device is separate from the first light-emitting device and the second light-emitting device, and the third light-emitting device is located at the center of a third vertex of the virtual quadrilateral, and the second vertex and the third vertex are located on another diagonal of the virtual quadrilateral.

18. A display device, characterized in that, include: A photosensitive device and a display panel as described in any one of claims 1 to 17; wherein the photosensitive device is disposed corresponding to the light-transmitting area of ​​the display panel.

19. The display device according to claim 18, characterized in that, The photosensitive device is a camera.

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