Display panel, display device and optical compensation method

Abstract

The application discloses a display panel, a display device and an optical compensation method, and relates to the technical field of display. The display area comprises a first display area and a second display area, the second display area at least partially surrounds the first display area; the light emitting element comprises a first light emitting element located in the first display area and a second light emitting element located in the second display area; the pixel circuit comprises a first pixel circuit and a second pixel circuit, the first pixel circuit is electrically connected with the first light emitting element, the second pixel circuit is electrically connected with the second light emitting element, the number of the first light emitting elements connected with one first pixel circuit is greater than the number of the second light emitting elements connected with one second pixel circuit; the optical detection unit comprises a first optical detection unit located in the first display area, and the first optical detection unit is used for detecting the brightness of the first light emitting element in the first display area. Thus, the display brightness uniformity of the first display area and the second display area is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a display panel, a display device, and an optical compensation method. Background Technology

[0002] Currently, display devices such as mobile phones and tablets often need to reserve space on the front for commonly used electronic photosensitive devices such as front-facing cameras, infrared sensors, and fingerprint recognition devices. For example, if these photosensitive devices are located at the top of the front of the display device, a non-display area will be formed in that location, resulting in a reduced screen-to-body ratio.

[0003] With the development of display technology, display panels are achieving increasingly higher screen-to-body ratios. Full-screen displays, with their narrow or even borderless bezels, have garnered widespread attention. In related technologies, to further increase the screen-to-body ratio, an optical component area can be created within the display area of ​​the display panel to house the aforementioned photosensitive devices. For example, an optical component area can be set up within the display area of ​​the screen, with the camera positioned below the screen and correspondingly within this area. During normal display, the optical component area functions as a display; when photos or videos need to be taken, the camera captures the images or videos through this area, thus enabling the optical component area to simultaneously perform both display and recording functions.

[0004] To improve the light-sensing performance of the optical component area, it is necessary to ensure that the optical component area has a high transmittance. In other words, the transmittance of the optical component area is different from that of the conventional display area. At present, how to improve the uniformity of display brightness between the optical component area and the conventional display area during the display stage has become one of the urgent technical problems to be solved. Summary of the Invention

[0005] In view of this, the present invention provides a display panel, a display device, and an optical compensation method, which aim to improve the uniformity of display brightness in the first display area and the second display area.

[0006] In a first aspect, the present invention provides a display panel including a display area, the display area including a first display area and a second display area, the second display area at least partially surrounding the first display area;

[0007] The light-emitting element includes a first light-emitting element located in a first display area and a second light-emitting element located in a second display area;

[0008] A pixel circuit includes a first pixel circuit and a second pixel circuit. The first pixel circuit is electrically connected to a first light-emitting element, and the second pixel circuit is electrically connected to a second light-emitting element. The number of first light-emitting elements connected to a first pixel circuit is greater than the number of second light-emitting elements connected to a second pixel circuit.

[0009] The optical detection unit includes a first optical detection unit located in the first display area, which is used to detect the brightness of the first light-emitting element in the first display area.

[0010] Secondly, based on the same inventive concept, the present invention provides an optical compensation method for optically compensating a display panel provided in the first aspect of the present invention. The display panel includes: a control chip, a photosensitive element, a feedback circuit electrically connected to the photosensitive element, a light-emitting element, and a pixel circuit electrically connected to the light-emitting element.

[0011] The photosensitive element is electrically connected to the control chip via a feedback circuit;

[0012] The light-emitting element is electrically connected to the control chip through pixel circuitry;

[0013] Optical compensation methods include: a feedback phase, a data analysis phase, and a compensation phase;

[0014] During the feedback phase, the photosensitive element is turned on and acquires optical information. The photosensitive element generates a brightness signal from the optical information and sends the brightness signal to the control chip through the first feedback circuit.

[0015] During the data analysis phase, the control chip compares the acquired brightness signal with the preset value and generates a compensation signal based on the difference between the brightness signal and the preset value.

[0016] During the compensation phase, the control chip sends a compensation signal to the pixel circuit, which then drives the light-emitting element to emit light based on the compensation signal.

[0017] Thirdly, based on the same inventive concept, the present invention provides a display device including the display panel provided in the first aspect of the present invention.

[0018] Compared with the prior art, the display panel, display device, and optical compensation method provided by the present invention achieve at least the following beneficial effects:

[0019] In the display panel and display device provided by the embodiments of the present invention, the second display area in the display area at least partially surrounds the first display area. Optionally, the first display area is an optical device area used to house optical devices. In the present invention, a first pixel circuit is electrically connected to a first light-emitting element in the first display area, and a second pixel circuit is electrically connected to a second light-emitting element in the second display area. The number of first light-emitting elements connected to one first pixel circuit is greater than the number of second light-emitting elements connected to one second pixel circuit, ensuring that the transmittance of the first display area is higher than that of the second display area, thus meeting the transmittance requirement of the first display area. Furthermore, the present invention introduces a first optical detection unit in the first display area, which is used to detect the brightness of the first light-emitting element in the first display area. When the brightness of the first light-emitting element is detected to be lower than that of the second light-emitting element in the second display area, the optical compensation method provided by the present invention can be used to compensate for the brightness of the first light-emitting element in the first display area, thereby balancing the difference in display brightness between the first and second display areas. This helps to improve the overall uniformity of display brightness in the display area and enhance the overall display effect of the display panel.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0021] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0023] Figure 1 The image shown is a top view of a display panel provided in an embodiment of the present invention;

[0024] Figure 2 As shown Figure 1 A cross-sectional view of the display panel along the AA direction;

[0025] Figure 3 The diagram shows a connection between a pixel circuit and a light-emitting element.

[0026] Figure 4 The diagram shows one possible arrangement of the optical detection unit and the first pixel circuit.

[0027] Figure 5 The diagram shows a possible layout of the signal lines in the pixel circuit and optical detection unit.

[0028] Figure 6The diagram shows a possible connection between a photosensitive element and a feedback circuit.

[0029] Figure 7 The image shown is a schematic diagram of a film layer of a display panel provided in an embodiment of the present invention;

[0030] Figure 8 The diagram shows a relative positional relationship between the photosensitive element and the first light-emitting element in the first display area.

[0031] Figure 9 The diagram shows a relative positional relationship between the first light-emitting element and the second photosensitive element in the first display area.

[0032] Figure 10 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention;

[0033] Figure 11 The diagram shows the correspondence between light-emitting elements of different colors and photosensitive units in the first display area;

[0034] Figure 12 The diagram shown illustrates the relative positional relationship between the first display area, the second display area, and the third display area in a display panel provided in an embodiment of the present invention.

[0035] Figure 13 The diagram shown illustrates another relative positional relationship between the first display area, the second display area, and the third display area in the display panel provided in an embodiment of the present invention.

[0036] Figure 14 As shown Figure 13 A diagram showing the relative positions of the third photosensitive element, the fourth photosensitive element, the third light-emitting element, and the first light-emitting element;

[0037] Figure 15 The diagram shown illustrates another relative positional relationship between the first display area, the second display area, and the third display area in the display panel provided in an embodiment of the present invention.

[0038] Figure 16 The diagram shows a relative positional relationship between the third and fourth sub-photosensitive elements and the light-emitting element in the third display area.

[0039] Figure 17 The figure shows a timing diagram of one type of drive for the feedback circuit in the diagram.

[0040] Figure 18 The diagram shown is a schematic diagram of a connection between the pixel circuit and the first fixed potential signal line and the second fixed potential signal line in the display panel provided in an embodiment of the present invention.

[0041] Figure 19The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention;

[0042] Figure 20 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention;

[0043] Figure 21 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention;

[0044] Figure 22 The diagram shows another connection between the photosensitive element and the feedback circuit.

[0045] Figure 23 The figure shows the voltage timing diagram at the control terminal of the conduction signal;

[0046] Figure 24 The diagram shows a possible layout of the signal lines in the pixel circuit and optical detection unit.

[0047] Figure 25 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention.

[0048] Figure 26 The diagram shown is a flowchart of an optical compensation method provided in an embodiment of the present invention.

[0049] Figure 27 The image shown is a top view of a display device provided in an embodiment of the present invention. Detailed Implementation

[0050] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0051] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0052] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0053] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0054] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0055] Figure 1 The image shown is a top view of a display panel provided in an embodiment of the present invention. Figure 2 As shown Figure 1 A cross-sectional view of the display panel along the AA direction. Figure 3 The diagram shows a connection between a pixel circuit and a light-emitting element.

[0056] Please refer to Figures 1 to 3 This invention provides a display panel including a display area A0, which includes a first display area A1 and a second display area A2, wherein the second display area A2 at least partially surrounds the first display area A1; it should be noted that... Figure 1 The description only takes the example of the second display area A2 completely surrounding the first display area A1, but it does not limit the relative positional relationship between the first display area A1 and the second display area A2. In some other embodiments of the present invention, the first display area A2 may also partially include the first display area A1.

[0057] The light-emitting element 10 includes a first light-emitting element 11 located in the first display area A1 and a second light-emitting element 12 located in the second display area A2;

[0058] The pixel circuit 20 includes a first pixel circuit 21 and a second pixel circuit 22. The first pixel circuit 21 is electrically connected to the first light-emitting element 11, and the second pixel circuit 22 is electrically connected to the second light-emitting element 12. The number of first light-emitting elements 11 connected to one first pixel circuit 21 is greater than the number of second light-emitting elements 12 connected to one second pixel circuit 22.

[0059] The optical detection unit 30 includes a first optical detection unit 31 located in the first display area A1. The first optical detection unit 31 is used to detect the brightness of the first light-emitting element 11 in the first display area A1.

[0060] It should be noted that, Figure 1 The illustrated embodiment only uses a rounded rectangular display panel as an example to illustrate the display panel of the present invention, and does not limit the specific structure of the display panel of the present invention. In some other embodiments of the present invention, the shape of the display panel may also be rectangular, circular, elliptical, or other structures including curved edges, and the present invention does not specifically limit it in this regard. Figure 1The illustration only shows one relative position of the first display area A1 on the display panel. In other embodiments of the present invention, the first display area A1 may also be disposed in other positions on the display panel, and the shape of the first display area A1 may also be set according to the actual situation. Figure 1 The square shape in the diagram is for illustrative purposes only. For example, the first display area A1 can also be set to a circle, a racetrack shape, etc. In addition, the size of the first display area A1 can be flexibly set according to actual needs. Figure 2 The embodiment shown is only a schematic diagram illustrating the relative positional relationship of the first light-emitting element 11, the second light-emitting element 12, and the first optical detection unit 31 on the display panel. It does not represent the actual size, nor does it limit the actual film structure of the display panel. Figure 3 This illustration only shows a relative positional relationship between the pixel circuit and the light-emitting element, and does not represent the actual number of the first light-emitting element 11 and the second light-emitting element 12.

[0061] Specifically, the display panel provided in the embodiments of the present invention includes a first display area A1 and a second display area A2. Optionally, Figure 1 Taking the example of a second display area A2 surrounding a first display area A1, in some other embodiments of the present invention, the second display area A2 may also partially surround the first display area A1, and the present invention is not limited thereto. Optionally, the first display area A1 is used to house electronic photosensitive devices such as cameras, infrared sensors, and fingerprint recognition devices. The first display area A1 is provided with a first light-emitting element 11, and the second display area A2 is provided with a second light-emitting element 12. During the display stage, both the second display area A2 and the first display area A1 perform display functions. The first light-emitting element 11 is driven to emit light by the first pixel circuit 21, and the second light-emitting element 12 is driven to emit light by the second pixel circuit 22. During the light-sensing stage, the first display area A1 acts as a light-transmitting area to achieve the light-sensing function, and the first light-emitting element 11 of the first display area A1 does not emit light. For example, when a camera is provided in the first display area A1, during the light-sensing stage, the first display area A1 acts as a light-transmitting area to achieve the image capture function. In this embodiment, the first display area A1 is integrated into the display area, which helps to reduce the space of the non-display area of ​​the display panel, thereby facilitating the design of a narrow bezel or bezel-less display panel.

[0062] When a first display area A1 is introduced into the display area to house electronic photosensitive devices such as cameras, infrared sensors, and fingerprint recognition devices, the first display area A1 will have a high transmittance requirement due to the light-sensing requirements of these devices. Therefore, this embodiment of the invention differentiates the light-emitting elements connected to the first pixel circuit 21 and the second pixel circuit 22, such that the number of first light-emitting elements 11 connected to one first pixel circuit 21 is greater than the number of second light-emitting elements 12 connected to one second pixel circuit 22. Figure 3The embodiment shown is illustrated by taking a first pixel circuit 21 connected to two first light-emitting elements 11 and a second pixel circuit 22 connected to a second light-emitting element 12 as an example. That is, a first pixel circuit 21 drives two first light-emitting elements 11 and a second pixel circuit 22 drives a second light-emitting element 12. By reducing the number of first pixel circuits 21 corresponding to the first display area A1, the transmittance of the first display area A1 can be increased.

[0063] In related technologies, because the number of light-emitting elements connected to a first pixel circuit 21 and a second pixel circuit 22 is different, the driving voltage / current received by the first light-emitting element 11 and the second light-emitting element 12 is different. The light-emitting brightness of the first light-emitting element 11 will be less than that of the second light-emitting element 12, resulting in the display brightness of the first display area A1 being lower than that of the second display area A2, thus affecting the display uniformity of the display panel.

[0064] To this end, this embodiment of the invention introduces a first optical detection unit 31 in the first display area A1. This first optical detection unit 31 is used to detect the brightness of the first light-emitting element 11 in the first display area A1. When the first optical detection unit 31 detects that the brightness of the first light-emitting element 11 is lower than the brightness of the second light-emitting element 12 in the second display area A2, it can compensate for the brightness of the first light-emitting element 11 in the first display area A1 to balance the difference in display brightness between the first display area A1 and the second display area A2. This helps to improve the overall uniformity of display brightness in the display area of ​​the display panel, and thus improves the overall display effect of the display panel.

[0065] Figure 4The diagram shows a possible arrangement of the optical detection unit and the first pixel circuit. This embodiment uses a 7T1C pixel circuit as an example. Optionally, the first pixel circuit includes seven transistors and a storage capacitor C0. The seven transistors are transistors T0 to T6. Transistor T0 serves as a driving transistor, with its gate connected to the first node, and its first and second terminals connected to the second and third nodes, respectively. The first transistor T1 serves as an initialization transistor, with its gate connected to the first scan line S1, its first terminal connected to the first reset signal line Vref1, and its second terminal connected to the first node N1. The second transistors T2 and T3 serve as a data writing module. The gates of the second transistor T2 and the third transistor T3 are connected to the second scan line S2. The first terminal of the second transistor T2 is connected to the data line DL, and its second terminal is connected to the second node N2; the first terminal of the third transistor is connected to the third node N2, and its second terminal is connected to the first node N1. The fourth transistor T4 serves as a second reset transistor, with its gate connected to the second scan line S2, its first terminal connected to the second reset signal line Vref2, and its second terminal connected to the fourth node. The fourth node is connected to the anode of the light-emitting element 10. The fifth transistor T5 and the sixth transistor T6 serve as light-emitting control transistors. Their gates are connected to the light-emitting control signal line Emit. The first terminal of the fifth transistor T5 is connected to the first power supply signal line PVDD, and the second terminal is connected to the second node N2. The first terminal of the sixth transistor T6 is connected to the third node N3, and the second terminal is connected to the fourth node N4. It should be noted that... Figure 4 Only the first pixel circuit is shown in the diagram; the actual configuration of the first pixel circuit is not limited.

[0066] Continue to refer to Figure 4 and combined Figure 5 , Figure 5 The diagram shows a possible layout of the signal lines in the pixel circuit and optical detection unit. Please refer to... Figure 4 and Figure 5 In this embodiment, the optical detection unit 30 may include a control signal line L1, a detection signal line L2, and a photosensitive element D0. The two ends of the photosensitive element D0 are electrically connected to the control signal line L1 and the detection signal line L2, respectively. The optical detection unit 30 and the first pixel circuit are independent of each other. Optionally, the control signal line L1 extends in the same direction as the first scan line S1, and the detection signal line L2 extends in the same direction as the data line DL. To avoid mutual interference between the signal lines in the optical detection unit 30 and the signal lines in the first pixel circuit, along a direction perpendicular to the plane of the display panel, the control signal line L1 does not overlap with any signal lines in the display panel that extend in the same direction, and the detection signal line L2 does not overlap with any signal lines in the display panel that extend in the same direction. The film layers of the control signal line L1 and the detection signal line L2 in the display panel will be specifically described in subsequent embodiments.

[0067] Continue to refer to Figure 4 In an optional embodiment of the present invention, the optical detection unit 30 and the pixel circuit 20 are not physically electrically connected. That is, the optical detection unit 30 and the pixel circuit 20 are two independent structures, with no structural reuse and independent operation processes. Thus, the operation of the optical detection unit 30 does not affect the operation of the pixel circuit. Therefore, while the optical detection unit 30 is introduced to detect the brightness of the first light-emitting element 11 in the first display area A1, the first pixel circuit 21 and the second pixel circuit 22 can still drive the light-emitting elements in the first display area A1 and the second display area A2 normally.

[0068] Figure 6 The diagram shown illustrates one possible connection between the photosensitive element and the feedback circuit. Please refer to it. Figure 6 In an optional embodiment of the present invention, the optical detection unit 30 includes a photosensitive element D0 and a feedback circuit connected to the photosensitive element. The photosensitive element D0 is used to receive the brightness signal of the light-emitting element and transmit it to the feedback circuit.

[0069] The display panel also includes a control chip IC, and the pixel circuit and feedback circuit are all electrically connected to the control chip;

[0070] The control chip IC is used to receive the brightness signal transmitted by the feedback circuit and generate a drive signal based on the brightness signal to send to the pixel circuit corresponding to the light-emitting element.

[0071] Optionally, the photosensitive element D0 mentioned in the embodiments of the present invention is a transparent photodiode.

[0072] Specifically, in the optical detection unit 30 provided in this embodiment of the invention, please refer to... Figures 1 to 6During the display phase, when the first light-emitting element 11 in the first display area A1 emits light, the photosensitive element D0 can sense the brightness of the light emitted by the first light-emitting element 11, receive the brightness signal of the first light-emitting element 11, and transmit the brightness signal to the control chip IC through the feedback circuit. Since the first pixel circuit 21 connected to the first light-emitting element 11 obtains the drive signal through the control chip IC, when the control chip receives the brightness signal of the first light-emitting element 11 transmitted by the feedback circuit, it will compare the brightness signal of the first light-emitting element 11 with the brightness signal of the second light-emitting element 12 in the second display area A2. If the brightness of the first light-emitting element 11 is lower than the brightness of the second light-emitting element 12, the control chip will adjust the drive signal provided to the first pixel circuit 21, increase the drive voltage / current provided to the first pixel circuit 21, thereby increasing the brightness of the first light-emitting element 11, reducing the difference in brightness between the first light-emitting element 11 and the second light-emitting element 12, and improving the display uniformity of the first display area A1 and the second display area A2.

[0073] It should be noted that, Figure 6 The feedback circuit is only shown as an illustration; the specific operation of the feedback circuit will be explained in subsequent embodiments.

[0074] Continue to refer to Figure 2 and combined Figure 7 , Figure 7 The diagram shown is a schematic representation of a film layer of a display panel provided in an embodiment of the present invention, illustrating a relative positional relationship between a first photosensitive element and a first light-emitting element. Optionally, the display panel includes a substrate 00 and an array layer 90 disposed on one side of the substrate 00. A first pixel circuit connected to the first light-emitting element 11 is formed on the array layer 90. Optionally, the array layer 90 includes a first metal layer M1, a second metal layer M2, and a semiconductor layer poly. The first metal layer M1 may be, for example, a gate metal layer, and the gates of some transistors in the display panel may be disposed on the first metal layer M1. The source and drain electrodes of some transistors in the display panel may be located on the second metal layer M2. The semiconductor layer poly includes a source region and a drain region, which are formed by doping with N-type or P-type impurity ions. The source electrode of the transistor is electrically connected to the source region of the semiconductor layer through a contact hole, and the drain electrode of the transistor is electrically connected to the drain region of the semiconductor layer through a contact hole. It should be noted that... Figure 7 The illustration only uses the example of array layer 90 including one type of transistor, but does not limit the number of types of transistors actually included in array layer 90. In some other embodiments of the present invention, array layer 90 may also include two types of transistors. Figure 7 This illustration only shows one type of film structure in the array layer and does not limit the actual number and size of the film layers contained in the array layer.

[0075] Continue to refer to Figure 2 and Figure 7 In an optional embodiment of the present invention, the first optical detection unit 31 includes a photosensitive element D0, the photosensitive element including a first photosensitive element D1, in the first display area A1, along the first direction F1, at least one first photosensitive element D1 overlaps with the first light-emitting element 11, wherein the first direction F1 is perpendicular to the plane of the display panel.

[0076] When a photosensitive element senses the brightness of the light emitted by the first light-emitting element 11, the photosensitive element needs to be positioned in the light-emitting direction of the first light-emitting element 11. This embodiment shows the first photosensitive element D1 positioned on the surface of the first light-emitting element 11 facing the display panel. Figure 3 In the scheme of the first light-emitting element 11 (represented by the upper surface of the first light-emitting element 11), the light emission of the side surface of the first light-emitting element 11 facing the display panel is the largest. When the first photosensitive element D1 is placed on the light-emitting surface of the first light-emitting element 11, the light intensity that the first photosensitive element D1 can sense will be greater. This is beneficial to improving the accuracy of the first photosensitive element D1 in sensing the brightness signal of the first light-emitting element 11. In this way, the driving signal provided by the control chip to the first light-emitting element 11 based on the brightness signal will be more accurate, which is more conducive to reducing the difference in display brightness between the first display area A1 and the second display area A2, and improving the overall display uniformity of the display panel.

[0077] Optionally, when the first photosensitive element D1 and the first light-emitting element 11 overlap along the first direction F1, assuming the overlapping area is S1 and the area of ​​the orthographic projection of the first light-emitting element 11 along the first direction F1 is S0, then S1 / S0≥10% to ensure that the first photosensitive element D1 can accurately and effectively sense the brightness of the first light-emitting element 11.

[0078] Optionally, the display panel further includes a pixel definition layer 80 disposed on the side of the array layer 90 away from the substrate 00. The pixel definition layer 80 defines a plurality of pixel openings. The anode 81 of the light-emitting element 10 is located on the side of the pixel definition layer 80 facing the array layer 90. The pixel openings expose the anode 81 of the light-emitting element 10. The light-emitting layer 82 of the light-emitting element 10 is located in the pixel openings, and the cathode 83 is located on the side of the light-emitting layer 82 away from the substrate 00. When a photosensitive element D0 is introduced into the display panel, the pixel definition layer 80 may optionally include a photosensitive opening. The first electrode 91 and the second electrode 92 of the photosensitive element D0 are respectively disposed on both sides of the photosensitive layer 92. The second electrode 92 of the photosensitive element D0 is disposed in the same layer as the anode 81 of the light-emitting element 10. At least a portion of the photosensitive layer 93 is located in the photosensitive opening, and the first electrode 91 of the photosensitive element D0 is located on the side of the photosensitive layer 93 away from the substrate 00. When the photosensitive element D0 senses the forward light emitted by the light-emitting element 10, the photosensitive layer 93 can extend directly above the light-emitting element 10, and the photosensitive layer 93 extending directly above the light-emitting element 10 is isolated from the cathode 83 by an insulating layer. The connection relationship of the photosensitive element D0 will be described in subsequent embodiments.

[0079] Figure 8 The diagram shows a relative positional relationship between the photosensitive element and the first light-emitting element in the first display area. This embodiment illustrates a scheme in which the first photosensitive element D1 includes two types of sub-photosensitive elements. It should be noted that the arrangement of the first light-emitting element 11 in the first display area A1 is merely illustrative and is not intended to limit the scope of the invention.

[0080] Please refer to Figure 8 In an optional embodiment of the present invention, the first photosensitive element D1 includes a first sub-photosensitive element D11 and a second sub-photosensitive element D12. The first sub-photosensitive element D11 is located on the side of the second sub-photosensitive element D12 closer to the second display area A2. The number of first light-emitting elements 11 corresponding to one first sub-photosensitive element D11 is less than the number of first light-emitting elements 11 corresponding to one second sub-photosensitive element D12. The number of first light-emitting elements 11 corresponding to one first sub-photosensitive element D11 mentioned in this embodiment refers to the number of first light-emitting elements 11 overlapping with one first sub-photosensitive element D11. The number of first light-emitting elements 11 corresponding to one second sub-photosensitive element D12 mentioned in this embodiment refers to the number of first light-emitting elements 11 overlapping with one second sub-photosensitive element.

[0081] Specifically, the difference between the first sub-photosensitive element D11 and the second sub-photosensitive element D12 mentioned in this embodiment lies in the different numbers of first light-emitting elements 11 they correspond to, and the different distances between the first sub-photosensitive element D11 and the second sub-photosensitive element D12 and the second display area A2. The first sub-photosensitive element D11 is closer to the second display area A2, while the second sub-photosensitive element D12 is farther away. A first sub-photosensitive element D11 closer to the second display area A2 corresponds to fewer first light-emitting elements 11. The fewer the number of light-emitting elements corresponding to the same photosensitive element, the higher the sensitivity of the photosensitive element to the brightness of the light-emitting elements. For a first light-emitting element 11 located near the second display area A2, if its brightness differs significantly from that of the second light-emitting element 12 in the second display area A2, the human eye will be able to perceive a noticeable difference, affecting the display effect. When the first sub-photosensitive element D11 is positioned close to the second display area A2 in this embodiment of the invention, since the number of first light-emitting elements 11 corresponding to the first sub-photosensitive element D11 is small, the brightness of the first light-emitting elements 11 positioned close to the second display area A2 can be accurately sensed. When the brightness of the first light-emitting element 11 positioned close to the second display area A2 is lower than the brightness of the first light-emitting element 11 in the second display area A2, the first sub-photosensitive element D11 will be able to sense it in time and feed the brightness signal back to the control chip through the feedback circuit. The control chip will be able to accurately compensate for the brightness of the first light-emitting element 11, which is more conducive to improving the brightness compensation effect of the first light-emitting element 11 and improving the display uniformity of the first display area A1 and the second display area A2.

[0082] Optionally, when a first photosensitive element D1 is provided for the first light-emitting element 11, in the area adjacent to the second display area A2 in the first display area A1, the first photosensitive element D1 can be set in the area of ​​the corresponding first light-emitting element 11 away from the second display area A2, which is beneficial for accurately detecting the brightness of the first light-emitting element 11 at the position adjacent to the second display area A2.

[0083] Figure 9 The diagram shows a relative positional relationship between the first light-emitting element 11 and the second photosensitive element D2 in the first display area A1. This embodiment illustrates a scheme in which the first photosensitive element D1 and the second photosensitive element D2 are introduced simultaneously in the first display area A1. Figure 10 The diagram shown is another film layer schematic diagram of the display panel provided in an embodiment of the present invention, illustrating a relative positional relationship between the second photosensitive element D2 and the first light-emitting element 11. This embodiment illustrates the film layer structure of the display panel. Figure 10 For details on the structure of the display panel, please refer to [link / reference]. Figure 7 The descriptions of the corresponding embodiments will not be repeated here. Figure 10 and Figure 7 The difference is that, along the first direction F1, Figure 10 The second photosensitive element D2 and the first light-emitting element 11 do not overlap, but Figure 7 The first photosensitive element D1 overlaps with the first light-emitting element 11.

[0084] Please refer to Figure 9 and Figure 10 In an optional embodiment of the present invention, the photosensitive element includes a second photosensitive element D2. Along a first direction F1, the second photosensitive element D2 does not overlap with the first light-emitting element 11. Along a second direction F2, the second photosensitive element D2 is adjacent to the first light-emitting element 11. The second direction F2 is parallel to the plane of the display panel. The second photosensitive element D2 is located on the side of the first photosensitive element D1 away from the second display area A2. It should be noted that, as mentioned in the present invention, the second photosensitive element D2 being adjacent to the first light-emitting element 11 means that along the second direction F2, no other photosensitive elements or light-emitting elements are disposed between the second photosensitive element D2 and the first light-emitting element 11.

[0085] Continue to refer to Figure 10 Optionally, the display panel further includes a pixel definition layer 80 disposed on the side of the array layer 90 away from the substrate 00. The pixel definition layer 80 defines a plurality of pixel openings. The anode 81 of the light-emitting element 10 is located on the side of the pixel definition layer 80 facing the array layer 90. The pixel openings expose the anode 81 of the light-emitting element 10. The light-emitting layer 82 of the light-emitting element 10 is located in the pixel openings, and the cathode 83 is located on the side of the light-emitting layer 82 away from the substrate 00. When a photosensitive element D0 is introduced into the display panel, the pixel definition layer 80 further includes a photosensitive opening. The first electrode 91 and the second electrode 92 of the photosensitive element D0 are respectively disposed on both sides of the photosensitive layer 92. The second electrode 92 of the photosensitive element D0 is disposed in the same layer as the anode 81 of the light-emitting element 10. At least a portion of the photosensitive layer 93 is located in the photosensitive opening, and the first electrode 91 of the photosensitive element D0 is located on the side of the photosensitive layer 93 away from the substrate 00. Pixel definition layer 80 is provided with pixel openings and photosensitive openings. Pixel definition layer 80 is a transparent film layer, and the lateral light emitted from the light-emitting layer 82 in the light-emitting element 10 can be sensed by the photosensitive layer 93 of the photosensitive element D0. At this time, the first electrode 91 of the photosensitive element D0 can be disposed in the same layer as the cathode of the light-emitting element 10, eliminating the need to introduce a new film layer separately for the first electrode 91 of the photosensitive element D0, thus simplifying the film layer structure of the display panel. The specific connection relationship of the photosensitive element D0 will be described in subsequent embodiments.

[0086] It should be noted that, Figure 9This illustration only shows a relative positional relationship between the first photosensitive element D1 and the second photosensitive element D2 and the first light-emitting element 11 in the first display area A1, and does not limit the actual number and size of the first photosensitive elements D1 and the second photosensitive element D2 actually included in the first display area A1. Furthermore, Figure 9 The explanation only takes the example of one first photosensitive element D1 corresponding to one first light-emitting element 11 and one second photosensitive element D2 also corresponding to one first light-emitting element 11, and does not limit the actual number of first light-emitting elements 11 corresponding to the first photosensitive element D1 and the second photosensitive element D2.

[0087] When the first display area A1 is simultaneously provided with a first photosensitive element D1 and a second photosensitive element D2, the first photosensitive element D1 refers to the photosensitive element located directly above the first light-emitting element 11 that senses the forward light emitted by the first light-emitting element 11, and the second photosensitive element D2 is the photosensitive element located to the side of the first photosensitive element D1 that senses the lateral light emitted by the first light-emitting element 11.

[0088] Considering that if all photosensitive elements are positioned directly above the first light-emitting element 11, even if the photosensitive elements are transparent, they will partially obstruct the forward light emission of the first light-emitting element 11, which may affect the overall display brightness of the first display area A1. To reduce the impact on the overall brightness of the first display area A1 when the photosensitive elements are positioned directly above the first light-emitting element 11, one approach is to reduce the overlap area between the first photosensitive element D1 and the first light-emitting element 11, so that along the first direction F1, the first photosensitive element D1 only overlaps with a portion of the upper surface of the first light-emitting element 11. In this case, the first photosensitive element D1 can both sense the forward light emission of the first light-emitting element 11 and will not excessively obstruct the forward light emission of the first light-emitting element 11. Another implementation is to introduce a second photosensitive element D2 into the first display area A1. The second photosensitive element D2 is located on the side of the first light-emitting element 11 and adjacent to the first light-emitting element 11. In this case, the second photosensitive element D2 will not block the forward light emission of the first light-emitting element 11, thus helping to reduce the light loss of the first light-emitting element 11.

[0089] Figure 11 The diagram shows the correspondence between light-emitting elements of different colors and photosensitive units in the first display area A1. This embodiment illustrates a relative positional relationship between the photosensitive elements and the light-emitting elements when the light-emitting elements in the first display area A1 include a red light-emitting element R, a green light-emitting element G, and a blue light-emitting element B.

[0090] Please refer to Figure 11In an optional embodiment of the present invention, the light-emitting elements include a red light-emitting element R, a green light-emitting element G, and a blue light-emitting element B, and the first optical detection unit 31 is used to detect the brightness of the green light-emitting element G in the first display area A1.

[0091] It should be noted that, Figure 11 The embodiment only shows a scheme in which the photosensitive element in the first optical detection unit 31 is placed directly above the green light-emitting element G to sense the forward light emission of the green light-emitting element G, but does not limit the relative positional relationship between the photosensitive element D0 and the green light-emitting element. In some other embodiments of the present invention, the photosensitive element can also be placed on the side of the green light-emitting element to sense the side light emission of the green light-emitting element.

[0092] Considering that the green light-emitting element G has a higher brightness and more noticeable brightness variation under the same driving voltage / current, this embodiment places the photosensitive element D0 directly above or to the side of the green light-emitting element G when introducing a photosensitive element D0 in the first display area A1 to detect the brightness of the light-emitting element. This is more conducive to achieving accurate sensing of the brightness signal, and thus more beneficial to improving the brightness compensation effect of the control chip on the first display area A1. In addition, not setting photosensitive elements for the red and blue light-emitting elements also helps to reduce the number of photosensitive elements in the first display area and improve the transmittance of the first display area.

[0093] Figure 12 The diagram shows a relative positional relationship between the first display area A1, the second display area A2, and the third display area A3 in a display panel provided in an embodiment of the present invention. It should be noted that this embodiment only uses the rectangular third display area A3 and the annular first display area A1 as examples for illustration, but does not limit the specific shapes of the first display area A1 and the third display area A3. It should also be noted that when the display panel includes a third display area, although... Figure 12 Although not shown in the diagram, the second light-emitting element in the second display area will also have a corresponding second pixel circuit connected to it. For example, one second pixel circuit corresponds to one second light-emitting element. Specific connection relationships can be found in [reference needed]. Figure 3 .

[0094] It should also be noted that when the display panel does not include the third display area A3, the first display area A1 is the entire display area surrounded by the second display area A2. For example, please refer to... Figure 8 When the display panel includes a third display area A3, the first display area A1 can be regarded as a transition area set between the second display area A2 and the third display area A3.

[0095] Please refer to Figure 12In an optional embodiment of the present invention, the display area A0 further includes a third display area A3, and the first display area A1 at least partially surrounds the third display area A3; the light-emitting element 10 includes a third light-emitting element 13 located in the third display area A3, and the pixel circuit includes a third pixel circuit 23 connected to the third light-emitting element 13, and the third pixel circuit 23 and the first pixel circuit 21 are both located in the first display area A1.

[0096] In this embodiment, the first display area A1 is located between the second display area A2 and the third display area A3. The first display area A1 can be regarded as a transition area connecting the second display area A2 and the third display area A3. When the brightness difference between the first display area A1 and the second display area A2 is large, it will affect the overall display uniformity of the display panel. Therefore, the present invention introduces an optical detection unit 30 in the first display area A1 to detect the brightness of the first light-emitting element 11 in the first display area A1. The third display area A3 can be regarded as a photosensitive area, and therefore has high requirements for transmittance. In this embodiment, when the third pixel circuit 23 connected to the third light-emitting element 13 in the third display area A3 is set in the first display area A1, the third pixel circuit 23 is no longer set in the third display area A3. Therefore, the influence of introducing the third pixel circuit 23 in the third display area A3 on the transmittance of the third display area A3 is avoided, which is conducive to improving the transmittance of the third display area A3, and thus conducive to improving the photosensitive effect of the third display area A3 in the light-sensing stage.

[0097] Continue to refer to Figure 12 In an optional embodiment of the present invention, the optical detection unit 30 further includes a second optical detection unit 32 located in the third display area A3, the second optical detection unit 32 being used to detect the brightness of the third light-emitting element 13 in the third display area A3.

[0098] Specifically, when the display panel includes a third display area A3, in this embodiment, a second optical unit is introduced in the third display area A3 to detect the brightness of the third light-emitting element 13 in the third display area A3. Thus, when a difference in brightness between the third display area A3 and the second display area A2 is detected, the brightness of the third light-emitting element 13 in the third display area A3 can be compensated according to the detection result of the third optical detection unit 30, thereby improving the overall uniformity of display brightness of the first display area A1, the second display area A2 and the third display area A3.

[0099] It should be noted that, Figure 12The illustrated embodiment only shows a scheme where, along the first direction, the photosensitive element and the first light-emitting element 11 overlap in the first display area, and the photosensitive element D0 and the third light-emitting element 13 overlap in the third display area A3. However, it does not limit the relative positional relationship between the photosensitive element D0 and the light-emitting element 10 in the first display area A1 and the third display area A3. In some other embodiments of the present invention, the relative positional relationship between the photosensitive element and the light-emitting element in the first display area A1 and the third display area A3 can also be manifested in other ways, for example, please refer to... Figure 13 and Figure 14 In an optional embodiment of the present invention, the first optical detection unit 31 includes a third photosensitive element D3, and the second optical detection unit 32 includes a fourth photosensitive element D4; along the first direction F1, the third photosensitive element D3 does not overlap with the first light-emitting element 11, and along the second direction F2, the third photosensitive element D3 is adjacent to the first light-emitting element 11; along the first direction F1, at least one fourth photosensitive element D4 overlaps with the third light-emitting element 13; wherein, the first direction F1 is perpendicular to the plane of the display panel, and the second direction F2 is parallel to the plane of the display panel. Figure 13 The diagram shown illustrates another relative positional relationship between the first display area A1, the second display area A2, and the third display area A3 in the display panel provided in an embodiment of the present invention. Figure 14 As shown Figure 13 A relative positional relationship diagram of the third photosensitive element D3, the fourth photosensitive element D4, the third light-emitting element 13, and the first light-emitting element 11. It should be noted that when the display panel includes a third display area, although... Figure 13 Although not shown in the diagram, the second light-emitting element in the second display area will also have a corresponding second pixel circuit connected to it. For example, one second pixel circuit corresponds to one second light-emitting element. Specific connection relationships can be found in [reference needed]. Figure 3 .

[0100] Specifically, please refer to Figure 13 and Figure 14When a third photosensitive element D3 is introduced in the first display area A1 to detect the brightness of the first light-emitting element 11 in the first display area A1, and a fourth photosensitive element D4 is introduced to detect the brightness of the third light-emitting element 13 in the third display area A3, this embodiment differentiates the relative positional relationship between the third photosensitive element D3 and the fourth photosensitive element D4 and the light-emitting element. Placing the third photosensitive element D3 on the side of the first light-emitting element 11 helps reduce the influence of the third photosensitive element D3 on the forward light emission of the first light-emitting element 11, making the brightness of the first display area A1 after brightness compensation closer to the brightness of the second display area A2, thus achieving a smooth transition in brightness between the second display area A2 and the third display area A3. Furthermore, since the third display area A3 performs a photosensitizing function during the light-sensing stage (e.g., for photography), the third display area A3 can be considered a light-transmitting area. When the fourth photosensitive element D4 is placed above the third light-emitting element 13, it helps reduce the optical diffraction problem in the light-transmitting area, thus improving the photosensitivity of the light-transmitting area. It should be noted that when the third photosensitive element D3 is disposed on the side of the first light-emitting element 11, optionally, for the third photosensitive element D3 and the first light-emitting element 11 adjacent to the second display area A2, the third photosensitive element D3 can be disposed on the side of the first light-emitting element 11 away from the second display area A2. This helps to avoid the light emission brightness of the light-emitting element in the second display area A2 adjacent to the third photosensitive element D3 affecting the light sensed by the third photosensitive element D3, and thus makes it more conducive to the third photosensitive element D3 to accurately detect the display brightness of the first light-emitting element 11 in the first display area A1.

[0101] Figure 15 The diagram shows another relative positional relationship between the first display area A1, the second display area A2, and the third display area A3 in the display panel provided in an embodiment of the present invention. In an optional embodiment of the present invention, the first optical detection unit 31 includes a third photosensitive element D3, and the second optical detection unit 32 includes a fourth photosensitive element D4; the arrangement density of the third photosensitive element D3 is greater than the arrangement density of the fourth photosensitive element D4.

[0102] Specifically, this embodiment differentiates the arrangement density of photosensitive elements in the first display area A1 and the third display area A3. Arrangement density refers to the number of photosensitive elements placed within the same unit area, or the area ratio of photosensitive elements within the same unit area. Since the third display area A3 performs the photosensitive function during the light-sensing stage, it requires high light transmittance. When introducing the fourth photosensitive element D4 into the third display area A3, this embodiment sets the arrangement density of the fourth photosensitive element D4 to be lower than that of the third photosensitive element D3 in the first display area A1. This helps reduce the area occupied by the fourth photosensitive element D4 in the third display area A3, thus reducing the impact of the introduction of the fourth photosensitive element D4 on the transmittance of the third display area A3.

[0103] Figure 16 The diagram shows a relative positional relationship between the third sub-photosensitive element D43 and the fourth sub-photosensitive element D44 and the light-emitting element in the third display area A3.

[0104] Please refer to Figure 16 In an optional embodiment of the present invention, the second optical detection unit 32 includes a fourth photosensitive element D4, which is used to sense the brightness of the third light-emitting element 13. The fourth photosensitive element D4 includes a third sub-photosensitive element D43 and a fourth sub-photosensitive element D44. The third sub-photosensitive element D43 is located on the side of the fourth sub-photosensitive element D44 closer to the first display area A1. The number of third light-emitting elements 13 corresponding to one third sub-photosensitive element D43 is less than the number of third light-emitting elements 13 corresponding to one fourth sub-photosensitive element D44. This embodiment is described using the example of one third sub-photosensitive element D43 corresponding to one third light-emitting element 13 and one fourth sub-photosensitive element D44 corresponding to two third light-emitting elements 13.

[0105] Specifically, the difference between the third sub-photosensitive element D43 and the fourth sub-photosensitive element D44 mentioned in this embodiment lies in the different numbers of third light-emitting elements 13 they correspond to, and the different distances of the third sub-photosensitive element D43 and the fourth sub-photosensitive element D44 from the first display area A1. The third sub-photosensitive element D43 is closer to the first display area A1, while the fourth sub-photosensitive element D44 is farther away. The third sub-photosensitive element D43 closer to the first display area A1 corresponds to fewer third light-emitting elements 13. The fewer the number of light-emitting elements corresponding to the same photosensitive element, the higher the sensitivity of the photosensitive element to the brightness of the light-emitting elements. For a third light-emitting element 13 located close to the first display area A1, if its brightness differs significantly from that of the second light-emitting element 12 in the first display area A1, the human eye will be able to perceive a noticeable difference, affecting the display effect. When the third sub-photosensitive element D43 is positioned close to the first display area A1 in this embodiment of the invention, since the number of third light-emitting elements 13 corresponding to the third sub-photosensitive element D43 is small, the brightness of the third light-emitting elements 13 positioned close to the first display area A1 can be accurately sensed. When the brightness of the third light-emitting element 13 positioned close to the first display area A1 is lower than the brightness of the third light-emitting element 13 in the first display area A1, the third sub-photosensitive element D43 will be able to sense it in time and feed the brightness signal back to the control chip through the feedback circuit. The control chip will be able to accurately compensate for the brightness of the third light-emitting element 13, which is more conducive to improving the brightness compensation effect of the third light-emitting element 13 and improving the display uniformity of the first display area A1.

[0106] refer to Figure 6 and Figure 5 In an optional embodiment of the present invention, the optical detection unit 30 includes a photosensitive element D0 and a feedback circuit connected to the photosensitive element; the feedback circuit includes a control signal line L1 and a detection signal line L2; the input terminal of the control signal line L1 is electrically connected to an enable signal terminal (Vn, Vn+1, Vn+2, etc.), and the output terminal of the control signal line L1 is electrically connected to the input terminal of the photosensitive element D0; the output terminal of the photosensitive element D0 is connected to the control chip IC through the detection signal line L2.

[0107] Specifically, this embodiment uses the feedback circuit in the optical detection unit 30, including control signal line L1 and detection signal line L2, as an example. The input terminal of the photosensitive element D0 is connected to control signal line L1, and the output terminal of the photosensitive element D0 is connected to detection signal line L2. The signals from the enable signal terminals (Vn, Vn+1, Vn+2, etc.) are transmitted to the photosensitive element D0 through control signal line L1. When the photosensitive element D0 receives the enable signal and turns on, it senses the brightness of the corresponding light-emitting element. The sensed brightness signal is transmitted to the control chip IC through detection signal line L2. The control chip IC compensates for the brightness of the light-emitting element based on the brightness signal, improving the uniformity of display brightness in different display areas of the display panel. The feedback circuit provided in this embodiment only includes control signal line L1 and detection signal line L2, without introducing other components. Therefore, it helps to reduce the area occupied by the feedback circuit in the display area, meeting the high PPI requirements of the display panel.

[0108] Figure 17 The diagram shows a driving timing diagram of the feedback circuit. Vn, Vn+1, and Vn+2 are the signals connected to the enable signal terminals of the control signal lines L1 corresponding to the photosensitive elements in rows n, n+1, and n+2, respectively. The enable signal is either a DC signal V1 or a high-impedance signal. When it is a DC signal V1, the corresponding photosensitive element is turned on, performing the brightness detection function; when it is a high-impedance signal, the corresponding photosensitive element is turned off. The DC signal V1 can be a ground signal, a constant positive voltage signal, or a negative voltage signal. In practical applications, the brightness of the light-emitting elements can be detected row by row using the photosensitive elements.

[0109] Continue to refer to Figure 6 In an optional embodiment of the present invention, the control signal line L1 extends along the second direction F2 and is arranged along the third direction F3, the detection signal line L2 extends along the third direction F3 and is arranged along the second direction F2, and the second direction F2 and the third direction F3 intersect; a plurality of photosensitive elements D0 located in the same row along the second direction F2 are electrically connected to the same control signal line L1, and a plurality of photosensitive elements D0 located in the same column along the third direction F3 are electrically connected to the same detection signal line L2.

[0110] This embodiment further explains the wiring method of the feedback circuit. The input terminals of photosensitive elements D0 located in the same row along the second direction F2 are connected to the same control signal line L1, while photosensitive elements D0 in different rows are connected to different control signal lines L1. This effectively reduces the number of control signal lines L1 included in the display panel and decreases the area ratio of control signal lines L1 in the display panel, thus improving the PPI of the display panel. Simultaneously, the output terminals of photosensitive elements D0 located in the same column along the third direction F3 are connected to the same detection signal line L2. This eliminates the need to introduce different detection signal lines L2 for different photosensitive elements D0, thus also reducing the number of detection signal lines L2 included in the display panel and decreasing the area ratio of detection signal lines L2 in the display panel, thereby also improving the PPI of the display panel.

[0111] Figure 18 The diagram shown is a schematic representation of a connection between the pixel circuit 20 and the first fixed potential signal line X1 and the second fixed potential signal line X2 in the display panel provided in an embodiment of the present invention. It should be noted that... Figure 18 Only the connection relationship between the pixel circuit 20 and the first fixed potential signal line X1 and the second fixed potential signal line X2 is shown; other signal lines connected to the pixel circuit 20 are not shown. In fact, the pixel circuit 20 can also be connected to other signal lines. Optionally, the first fixed potential signal line X1 can be, for example, a... Figure 4 The pixel circuit provides a first reset signal line Vref1 or a second reset signal line Vref2 for a reset signal. Alternatively, it could be any other signal line providing a constant potential signal to the pixel circuit 20 and extending along the second direction F2. The second fixed potential signal line X2 could be, for example, a... Figure 4 The pixel circuit provides power signal lines such as PVDD, and of course, other signal lines extending along the third direction F3 to provide a constant potential signal to the pixel circuit 20. The signals transmitted on these signal lines are all constant. It should be noted that the pixel circuit 20 provided in this embodiment of the invention can adopt pixel circuit 20 in related technologies, such as 7T1C (containing 7 transistors and one capacitor) or 8T1C (containing 8 transistors and 1 capacitor) circuits, etc., and the invention does not specifically limit it in this regard.

[0112] Figure 19 The diagram shown is another film layer schematic diagram of the display panel provided in an embodiment of the present invention, illustrating the relative positional relationship of the control signal line, the detection signal line, the first fixed potential signal line, and the second fixed potential signal line.

[0113] Please combine Figure 18 and Figure 19In an optional embodiment of the present invention, the display panel includes a first fixed potential signal line X1 and a second fixed potential signal line X2 electrically connected to the pixel circuit 20. The first fixed potential signal line X1 extends along a second direction F2, and the second fixed potential signal line X2 extends along a third direction F3. The control signal line L1 is arranged on the same layer as the first fixed potential signal line X1 and adjacent to it, and the detection signal line L2 is arranged on the same layer as the second fixed potential signal line X2 and adjacent to it.

[0114] Specifically, when a feedback circuit is introduced into the display panel, a control signal line L1 and a detection signal line L2 are added to the display panel. Since both the control signal line L1 and the detection signal line L2 transmit signals, in order to reduce or avoid the influence of the signals on the control signal line L1 and the detection signal line L2 on the signals on the original signal lines in the display panel, one implementation of the present invention is to set the control signal line L1 and the detection signal line L2 on the same layer as the original fixed potential signal lines in the display panel. For example, the control signal line L1 extending along the second direction F2 is placed on the same layer as the first fixed potential signal line X1 extending along the second direction F2 in the display panel, and the detection signal line L3 extending along the third direction F3 is placed on the same layer as the second fixed potential signal line X2 extending along the third direction F3 in the display panel. This helps to reduce the influence of the feedback circuit on the signal of the pixel circuit. In addition, when the control signal line L1 and the detection signal line L2 in the feedback circuit are set on the same layer as the fixed potential signal line in the display panel, there is no need to add a new film layer in the display panel to set the control signal line L1 and the detection signal line L2. Therefore, it is also beneficial to simplify the overall film layer structure of the display panel when introducing the feedback circuit and realize the requirement of thinner display panel.

[0115] It should be noted that when the control signal lines and detection signal lines are fabricated using the existing film layer structure of the display panel, traces connecting to the control signal lines or detection signal lines can be formed simultaneously in the display panel during the fabrication of the corresponding film layers. These traces enable the electrical connection between the control signal lines and detection signal lines and the control chip. This invention does not impose specific limitations on this. Optionally, please refer to... Figure 7 and Figure 19 The control signal line L1 and the first fixed potential signal line X1 can be located in the capacitive metal layer MC of the display panel, and the detection signal line L2 and the second fixed potential signal line X2 can be located in the second metal layer M2 of the display panel.

[0116] It should be noted that, Figure 7 and Figure 19 The illustration only shows the location of one film layer for the control signal line L1 and the detection signal line L2 in the display panel. In some other embodiments of the present invention, the control signal line L1 and the detection signal line L2 may also be located in other film layers of the display panel, for example, please refer to Figure 20 and Figure 9 , Figure 20 The diagram shown is a schematic diagram of another film layer of the display panel provided in an embodiment of the present invention. Figure 20 and Figure 9 In the illustrated embodiment, the control signal line L1 is disposed on the same layer as the film layer containing the cathode 83 in the display panel, but is insulated from the cathode 83. That is, the control signal line L1 can be wired on the film layer containing the cathode 83. When a photosensitive element D0 is introduced into the display panel, the film layer containing the cathode of the display panel needs to be patterned to avoid the photosensitive element D0. At this time, the control signal line L1 can be set on the patterned film layer containing the cathode to simplify the film layer structure of the display panel.

[0117] Optionally, when the detection signal line L2 is set on the same layer as some of the traces in the pixel circuit, the detection signal line L2 can be set between two adjacent pixel circuits along the second direction. When the control signal line L1 is set on the same layer as some of the traces in the pixel circuit, the control signal line L1 can be set between adjacent pixel circuits along the third direction F3.

[0118] Figure 21 The diagram shown is another film layer schematic diagram of the display panel provided in an embodiment of the present invention. In an optional embodiment of the present invention, the display panel includes multiple signal traces electrically connected to the pixel circuit, and the control signal line L1 and the detection signal line L2 are disposed in a different layer from the signal traces.

[0119] Assuming the display panel includes two or more metal layers to set the signal traces electrically connected to the pixel circuits, when a feedback circuit is introduced into the display panel, an additional metal layer can be added to the display panel to set the control signal line L1 and the detection signal line L2 in the feedback circuit. For example, please refer to... Figure 21 The display panel also includes a third metal layer M3 and a fourth metal layer M4. The signal traces connected to the pixel circuits in the display panel are located on the first metal layer M1 and the second metal layer M2. The control signal line L1 and the detection signal line L2 in the feedback circuit corresponding to the photosensitive element are respectively located on the fourth metal layer M4 and the third metal layer M3. This increases the distance between the control signal line L1 and the detection signal line L2 and the original signal lines in the display panel, reducing or avoiding the influence of the feedback circuit signals on the pixel circuit signals, thus ensuring the display reliability of the display panel. It should be noted that... Figure 21 The example given is that the control signal line L1 is located in the fourth metal layer M4 and the detection signal line L2 is located in the third metal layer M3. In some other embodiments of the present invention, the control signal line L1 may also be located in the third metal layer M3 and the detection signal line L2 may be located in the fourth metal layer M4.

[0120] It should be noted that when the control signal lines and detection signal lines are fabricated using the newly added film layer, connecting leads can be formed in the newly added film layer to achieve electrical connection between the control signal lines and detection signal lines and the control chip. This invention does not impose specific limitations on this.

[0121] Figure 22 The diagram shows another possible connection between the photosensitive element and the feedback circuit. Figure 23 The figure shows the voltage timing diagram at the control terminal of the conduction signal. Figure 24 The diagram shows a possible layout of the signal lines in the pixel circuit and optical detection unit. Figure 25 The diagram shown is another film layer schematic of the display panel provided in an embodiment of the present invention. This embodiment shows a scheme in which the feedback circuit further includes a first control transistor.

[0122] Please refer to Figures 22 to 25 In an optional embodiment of the present invention, the feedback circuit further includes a conduction signal control terminal and a first control transistor T7. The input terminal of the photosensitive element D0 is connected to the control signal line L1 through the first control transistor T7. The control terminals of the first control transistor T7 corresponding to the multiple photosensitive elements D0 located in the same row along the second direction F2 are connected to the same conduction signal control terminal (Gn, Gn+1, Gn+2, etc.).

[0123] Specifically, this embodiment illustrates a scheme in which a first control transistor T7 is introduced between the input terminal of the photosensitive element D0 and the control signal line L1, and the control terminal of the first control transistor T7 is connected to the conduction signal control terminal. Figure 23 In the timing diagram shown, Gn, Gn+1, and Gn+2 represent the voltages on the conduction signal control terminals connected to the first control transistor T7 in rows n, n+1, and n+2, respectively. When the first control transistor T7 is introduced, the conduction time of the first control transistor T7 can control the brightness detection time of the corresponding photosensitive element D0 on the light-emitting element. Optionally, the first control transistors T7 in different rows are turned on in a time-division manner, allowing the photosensitive elements D0 in different rows to perform brightness detection in a time-division manner. When the first control transistor T7 is introduced, the signals on each control signal line L1 can be converted into DC global signals (in this embodiment, it is illustrated by the example that the signals transmitted on each control signal line L1 are all voltage signals V1). That is, each control signal line L1 can be connected to the same signal terminal on the control chip IC, which helps to reduce the number of signal terminals connected to the control signal lines L1 on the control chip IC and in the feedback circuit, thus reducing the production cost of the control chip. It should be noted that when the first control transistor T7 is introduced into the display panel, it can be manufactured using the same process as some other transistors in the display panel, thus simplifying the manufacturing process. Additionally, please refer to... Figure 24In the layout diagram, the seventh transistor T7 can be located on the side of the data line in a pixel circuit away from the power signal line PVDD, that is, in the area between two adjacent pixel circuits along the second direction F2. When a photosensitive element is introduced into the display panel, the photosensitive element can also be placed in the area between two adjacent pixel circuits along the second direction F2; the present invention does not specifically limit this.

[0124] Please combine Figure 13 and Figure 22 In an optional embodiment of the present invention, the display area further includes a third display area A3, and the first display area A1 at least partially surrounds the third display area A3; the first control transistor T7 is located in the first display area A1. Specifically, when the first control transistor is introduced into the feedback circuit, the first control transistor in the feedback circuit corresponding to the third display area A3 can be disposed in the first display area A1, so as to avoid the first control transistor being introduced into the third display area A3 affecting the transmittance of the third display area A3, thereby improving the transmittance of the third display area A3.

[0125] It should be noted that when the feedback circuit includes a first control transistor, the first control transistor can be fabricated simultaneously with the existing transistors in the display panel, thereby simplifying the display panel manufacturing process and improving production efficiency. It should also be noted that... Figure 22 The description only uses a P-type transistor as an example of the first control transistor, and does not limit the type of the first control transistor. In some other embodiments of the present invention, the first control transistor may also be an N-type transistor.

[0126] Based on the same inventive concept, the present invention also provides an optical compensation method for optically compensating the display panel provided in the above embodiments of the present invention. Figure 26 The diagram shown is a flowchart of an optical compensation method provided in an embodiment of the present invention. Referring to the diagram, the display panel includes: a control chip, a photosensitive element, a feedback circuit electrically connected to the photosensitive element, a light-emitting element, and a pixel circuit electrically connected to the light-emitting element; the photosensitive element is electrically connected to the control chip via the feedback circuit; the light-emitting element is electrically connected to the control chip via the pixel circuit.

[0127] Optical compensation methods include: a feedback phase, a data analysis phase, and a compensation phase;

[0128] S01. During the feedback phase, the photosensitive element is turned on and acquires optical information. The photosensitive element generates a brightness signal from the optical information and sends the brightness signal to the control chip through the feedback circuit.

[0129] S01. During the data analysis phase, the control chip compares the acquired brightness signal with the preset value and generates a compensation signal based on the difference between the brightness signal and the preset value.

[0130] S01. During the compensation phase, the control chip sends a compensation signal to the pixel circuit, and the pixel circuit drives the light-emitting element to emit light according to the compensation signal.

[0131] Specifically, this embodiment of the invention introduces a photosensitive element in the first display area. When the photosensitive element is turned on, it can collect the brightness information of the corresponding light-emitting element, convert the light signal into a brightness signal, and then transmit the brightness signal to the control chip through a feedback circuit. The control chip can analyze the brightness signal, compare the brightness signal with a preset value, generate a compensation signal, and finally send the compensation signal to the pixel circuit corresponding to the light-emitting element, so that the light-emitting element emits light according to the compensated brightness signal. Through the cooperation of the photosensitive element, the feedback circuit, and the control chip, compensation for the brightness of the light emitted in the first display area is achieved, effectively improving the uniformity of display brightness in different display areas of the display panel.

[0132] Based on the same inventive concept, the present invention also provides a display device, referring to... Figure 27 , Figure 27 The image shown is a top view of a display device provided in an embodiment of the present invention. The display device 200 includes the display panel 100 in any of the above embodiments.

[0133] The display device 200 provided in this embodiment of the invention can be any electronic device with display function, such as a touch screen, mobile phone, tablet computer, laptop computer, e-reader, or television. The display device 200 provided in this embodiment of the invention has the beneficial effects of the display module 100 provided in this embodiment of the invention. For details, please refer to the specific descriptions of the display module 100 in the above embodiments, which will not be repeated here.

[0134] Understandable Figure 27 The shape of the display device 200 is illustrated using only a rounded rectangle structure as an example. In some other embodiments of the present invention, the display device 200 may also be embodied as a rectangle, a circle, an ellipse or any other feasible shape. The present invention does not specifically limit this.

[0135] In summary, the display panel, display device, and optical compensation method provided by this invention achieve at least the following beneficial effects:

[0136] In the display panel and display device provided by the embodiments of the present invention, the second display area in the display area at least partially surrounds the first display area. Optionally, the first display area is an optical device area used to house optical devices. In the present invention, a first pixel circuit is electrically connected to a first light-emitting element in the first display area, and a second pixel circuit is electrically connected to a second light-emitting element in the second display area. The number of first light-emitting elements connected to one first pixel circuit is greater than the number of second light-emitting elements connected to one second pixel circuit, ensuring that the transmittance of the first display area is higher than that of the second display area, thus meeting the transmittance requirement of the first display area. Furthermore, the present invention introduces a first optical detection unit in the first display area, which is used to detect the brightness of the first light-emitting element in the first display area. When the brightness of the first light-emitting element is detected to be lower than that of the second light-emitting element in the second display area, the optical compensation method provided by the present invention can be used to compensate for the brightness of the first light-emitting element in the first display area, thereby balancing the difference in display brightness between the first and second display areas. This helps to improve the overall uniformity of display brightness in the display area and enhance the overall display effect of the display panel.

[0137] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display panel, characterized in that, The display area includes a first display area and a second display area, wherein the second display area at least partially surrounds the first display area; The light-emitting element includes a first light-emitting element located in the first display area and a second light-emitting element located in the second display area; A pixel circuit includes a first pixel circuit and a second pixel circuit. The first pixel circuit is electrically connected to the first light-emitting element, and the second pixel circuit is electrically connected to the second light-emitting element. The number of first light-emitting elements connected to one first pixel circuit is greater than the number of second light-emitting elements connected to one second pixel circuit. An optical detection unit includes a first optical detection unit located in the first display area, the first optical detection unit being used to detect the brightness of the first light-emitting element in the first display area; the first optical detection unit includes a photosensitive element, the photosensitive element including a first photosensitive element and a second photosensitive element, in the first display area, along a first direction, at least one of the first photosensitive elements overlaps with the first light-emitting element, along the first direction, the second photosensitive element does not overlap with the first light-emitting element, along a second direction, the second photosensitive element is adjacent to the first light-emitting element, the second photosensitive element is located on the side of the first photosensitive element away from the second display area, wherein the first direction is perpendicular to the plane where the display panel is located, and the second direction is parallel to the plane where the display panel is located.

2. The display panel according to claim 1, characterized in that, The optical detection unit has no physical electrical connection with the pixel circuit.

3. The display panel according to claim 1, characterized in that, The optical detection unit includes a photosensitive element and a feedback circuit connected to the photosensitive element. The photosensitive element is used to receive the brightness signal of the light-emitting element and transmit it to the feedback circuit. The display panel also includes a control chip, and the pixel circuit and the feedback circuit are both electrically connected to the control chip; The control chip is used to receive the brightness signal transmitted by the feedback circuit, and generate a driving signal based on the brightness signal and send it to the pixel circuit corresponding to the light-emitting element.

4. The display panel according to claim 1, characterized in that, The first photosensitive element includes a first sub-photosensitive element and a second sub-photosensitive element. The first sub-photosensitive element is located on the side of the second sub-photosensitive element that is closer to the second display area. The number of first light-emitting elements corresponding to one first sub-photosensitive element is less than the number of first light-emitting elements corresponding to one second sub-photosensitive element.

5. The display panel according to claim 1, characterized in that, The light-emitting elements include red, green and blue light-emitting elements, and the first optical detection unit is used to detect the brightness of the green light-emitting element in the first display area.

6. The display panel according to claim 1, characterized in that, The display area further includes a third display area, wherein the first display area at least partially surrounds the third display area; The light-emitting element includes a third light-emitting element located in the third display area, and the pixel circuit includes a third pixel circuit connected to the third light-emitting element. Both the third pixel circuit and the first pixel circuit are located in the first display area.

7. The display panel according to claim 6, characterized in that, The optical detection unit further includes a second optical detection unit located in the third display area, the second optical detection unit being used to detect the brightness of the third light-emitting element in the third display area.

8. The display panel according to claim 7, characterized in that, The first optical detection unit includes a third photosensitive element, and the second optical detection unit includes a fourth photosensitive element; Along the first direction, the third photosensitive element does not overlap with the first light-emitting element; along the second direction, the third photosensitive element is adjacent to the first light-emitting element. Along a first direction, at least one of the fourth photosensitive elements overlaps with the third light-emitting element; wherein the first direction is perpendicular to the plane of the display panel, and the second direction is parallel to the plane of the display panel.

9. The display panel according to claim 7, characterized in that, The first optical detection unit includes a third photosensitive element, and the second optical detection unit includes a fourth photosensitive element; The arrangement density of the third photosensitive element is greater than that of the fourth photosensitive element.

10. The display panel according to claim 7, characterized in that, The second optical detection unit includes a fourth photosensitive element, which is used to sense the brightness of the third light-emitting element; The fourth photosensitive element includes a third sub-photosensitive element and a fourth sub-photosensitive element. The third sub-photosensitive element is located on the side of the fourth sub-photosensitive element that is closer to the first display area. The number of third light-emitting elements corresponding to one third sub-photosensitive element is less than the number of third light-emitting elements corresponding to one fourth sub-photosensitive element.

11. The display panel according to claim 3, characterized in that, The optical detection unit includes a photosensitive element and a feedback circuit connected to the photosensitive element; the feedback circuit includes a control signal line and a detection signal line. The input terminal of the control signal line is electrically connected to the enable signal terminal, and the output terminal of the control signal line is electrically connected to the input terminal of the photosensitive element. The output terminal of the photosensitive element is connected to the control chip via the detection signal line.

12. The display panel according to claim 11, characterized in that, The control signal line extends along the second direction and is arranged along the third direction, the detection signal line extends along the third direction and is arranged along the second direction, and the second direction and the third direction intersect. The plurality of photosensitive elements located in the same row along the second direction are electrically connected to the same control signal line, and the plurality of photosensitive elements located in the same column along the third direction are electrically connected to the same detection signal line.

13. The display panel according to claim 11, characterized in that, The display panel includes a first fixed potential signal line and a second fixed potential signal line electrically connected to the pixel circuit. The first fixed potential signal line extends along a second direction, and the second fixed potential signal line extends along a third direction. The second direction and the third direction intersect. The control signal line is arranged on the same layer as the first fixed potential signal line and adjacent to it, and the detection signal line is arranged on the same layer as the second fixed potential signal line and adjacent to it.

14. The display panel according to claim 11, characterized in that, The display panel includes multiple signal traces electrically connected to the pixel circuit, and the control signal line and the detection signal line are disposed on a different layer from the signal traces.

15. The display panel according to claim 11, characterized in that, The feedback circuit further includes a conduction signal control terminal and a first control transistor, and the input terminal of the photosensitive element is connected to the control signal line through the first control transistor; The control terminals of the first control transistors corresponding to the plurality of photosensitive elements located in the same row along the second direction are connected to the same conduction signal control terminal.

16. The display panel according to claim 15, characterized in that, The display area further includes a third display area, and the first display area at least partially surrounds the third display area; the first control transistor is located in the first display area.

17. An optical compensation method, characterized in that, For optical compensation of the display panel according to any one of claims 1 to 16, the display panel includes: a control chip, a photosensitive element, a feedback circuit electrically connected to the photosensitive element, a light-emitting element, and a pixel circuit electrically connected to the light-emitting element; The photosensitive element is electrically connected to the control chip through the feedback circuit; The light-emitting element is electrically connected to the control chip through the pixel circuit; The optical compensation method includes: a feedback phase, a data analysis phase, and a compensation phase; During the feedback phase, the photosensitive element is turned on and acquires optical information. The photosensitive element generates a brightness signal from the optical information and sends the brightness signal to the control chip through the feedback circuit. During the data analysis phase, the control chip compares the acquired brightness signal with a preset value and generates a compensation signal based on the difference between the brightness signal and the preset value. During the compensation phase, the control chip sends the compensation signal to the pixel circuit, and the pixel circuit drives the light-emitting element to emit light according to the compensation signal.

18. A display device, characterized in that, Includes the display panel described in any one of claims 1 to 16.

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