Display device

Abstract

The invention provides a display device which comprises a display panel and a driving chip, the display panel comprises an array substrate, the array substrate comprises a semiconductor layer and a gate layer, a photosensitive diode is arranged in the array substrate and comprises a PN junction diode composed of the semiconductor layer and the gate layer, and a metal wire is electrically connected with the photosensitive diode. The driving chip is electrically connected with the metal wire, and the driving chip is used for sending a sampling signal to the photosensitive diode, receiving a sensing signal of the photosensitive diode, generating ambient light brightness information according to the sensing signal, and adjusting the brightness of the display panel according to the ambient light brightness information. According to the display panel, the photosensitive diodes are integrated into the array substrate of the display panel, independent light sensing sensors do not need to be arranged on the periphery of the front-facing camera, the peripheral space of the front-facing camera is released, a camera with a larger size can be arranged, meanwhile, the cost of photosensitive components is reduced, and the display efficiency is improved. And the sensitivity and the response speed of sensing the ambient light are improved.

Description

Technical Field

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

[0002] Electronic products often use independent ambient light sensors to implement adaptive brightness adjustment of display panels. These sensors are located next to the front-facing camera of the display panel and are used to sense the current ambient brightness, thereby enabling the electronic product to adaptively adjust the brightness of the display panel.

[0003] The above solution presents the following technical issues: First, it requires additional photosensors, increasing the cost of the electronic product. Second, the space around the front camera of the electronic product is occupied by the light sensor, making it impossible to install a larger camera, limiting the improvement of camera functions. Furthermore, in the traditional solution, the photosensor device is placed below the display panel, which obscures the light sensor device, reducing its sensitivity to ambient light. Furthermore, the traditional solution requires information transmission and processing through a microcontroller unit, which increases the response time of adaptive brightness adjustment and affects the user's visual experience.

[0004] Therefore, it is necessary to propose a new technical solution to solve the above technical problems. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a display device, which aims to solve the technical problem in the prior art that the space around the front camera is occupied by the light sensing sensor, resulting in the inability to install a larger camera.

[0006] An embodiment of the present application provides a display device, which includes a display panel and a driver chip. The display panel includes: an array substrate, the array substrate including a semiconductor layer and a gate layer; a photosensitive diode, the photosensitive diode is arranged in the array substrate, the photosensitive diode includes a PN junction diode composed of the semiconductor layer and the gate layer; and a metal trace, the metal trace is electrically connected to the photosensitive diode; wherein the driver chip is electrically connected to the metal trace, the driver chip is used to send a sampling signal to the photosensitive diode, and receive a sensing signal from the photosensitive diode, and is used to generate ambient light brightness information according to the sensing signal, and adjust the brightness of the display panel according to the ambient light brightness information.

[0007] In the above display device, the display panel includes a display area and a non-display area located outside the display area, and the photosensitive diode is arranged in the display area or in the non-display area.

[0008] In the above display device, the display panel includes at least two photosensitive diodes, and the at least two photosensitive diodes include a first photosensitive diode and a second photosensitive diode. The first photosensitive diode is arranged on one side of the display area, and the second photosensitive diode is arranged on the other side of the display area.

[0009] In the above display device, the display panel includes one metal wire, the metal wire surrounds the display area, and two ends of the metal wire are electrically connected to two ports of the driver chip respectively.

[0010] In the above-mentioned display device, the metal routing includes a first routing segment, a second routing segment and a third routing segment, the first routing segment connects the first photosensitive diode and the first port of the driver chip, the second routing segment connects the second photosensitive diode and the second port of the driver chip, and the third routing segment connects the first photosensitive diode and the second photosensitive diode.

[0011] In the above display device, the display panel further includes a camera opening area, a detection trace is provided outside the camera opening area, and the metal trace is electrically connected to the detection trace.

[0012] In the above-mentioned display device, the metal routing includes a fourth routing segment, a fifth routing segment, a sixth routing segment and a seventh routing segment, the fourth routing segment connects the first photosensitive diode and the first port of the driver chip, the fifth routing segment connects the first photosensitive diode and the detection routing, the sixth routing segment connects the second photosensitive diode and the detection routing, and the seventh routing segment connects the second photosensitive diode and the second port of the driver chip.

[0013] In the above-mentioned display device, the driving chip includes an amplifying filter, an analog-to-digital converter, a brightness register, and a driving signal generator. The amplifying filter is used to amplify the sensing signal. The analog-to-digital converter is used to generate the ambient light brightness information from the sensing signal. The ambient light brightness information is a digital signal. The brightness register is used to store the correspondence between the ambient light brightness and the display panel brightness. The driving signal generator is used to search the target brightness value from the brightness register according to the ambient light brightness information, and generate a driving signal to be output to the display panel according to the target brightness value.

[0014] In the above-mentioned display device, the display panel includes two metal routing lines, the two metal routing lines include a third metal routing line and a fourth metal routing line, the third metal routing line includes an eighth routing line segment and a ninth routing line segment, the fourth metal routing line includes a tenth routing line segment and an eleventh routing line segment, the eighth routing line segment connects the first photosensitive diode and the first port of the driver chip, the tenth routing line segment connects the second photosensitive diode and the second port of the driver chip, the ninth routing line segment connects the first photosensitive diode and the third port of the driver chip, and the eleventh routing line segment connects the second photosensitive diode and the fourth port of the driver chip.

[0015] In the above-mentioned display device, the driving chip includes a differential amplifier filter, an analog-to-digital converter, a brightness register and a driving signal generator. The differential amplifier filter is used to perform differential amplification processing on the sensing signals of the first photosensitive diode and the second photosensitive diode. The analog-to-digital converter is used to generate the ambient light brightness information from the sensing signal. The ambient light brightness information is a digital signal. The brightness register is used to store the correspondence between the ambient light brightness and the display panel brightness. The driving signal generator is used to search the target brightness value from the brightness register according to the ambient light brightness information, and generate a driving signal to be output to the display panel according to the target brightness value.

[0016] The display device of the present application adopts a PN junction diode composed of a semiconductor layer and a gate layer as a photosensitive diode, and sets it in an array substrate. The technical solution of electrically connecting it to the driver chip through metal wiring can effectively solve the technical problem that the space around the front camera is occupied by the light sensing sensor. Specifically, when ambient light shines on the photosensitive diode, the impedance of the photosensitive diode will change accordingly according to the change in light intensity. The driver chip can accurately obtain ambient light brightness information by sending a sampling signal to the photosensitive diode and receiving a sensing signal. Since the photosensitive diode is directly integrated into the display panel, there is no need to set up an independent light sensing sensor around the front camera, thereby freeing up the space around the front camera, allowing the display device to set up a larger camera or add other functional sensors, thereby improving the camera function and overall product performance.

[0017] Furthermore, the technical solution of this application utilizes the semiconductor and gate layers already present in the display panel manufacturing process to construct the photodiode, eliminating the need for additional photosensitive components and significantly reducing the cost of electronic products. Furthermore, because the photodiode is directly integrated within the display panel, the need for a covering film layer above the photodiode is eliminated. This improves the sensitivity and accuracy of ambient light sensing compared to traditional solutions where the photosensitive sensor is obscured by the display panel.

[0018] The technical solution of this application also achieves improved response speed. The driver chip directly generates ambient light brightness information based on the sensing signal of the photodiode and adjusts the display panel brightness, eliminating the need for information transmission and processing by the microcontroller unit. This shortens the response time of adaptive brightness adjustment and improves the user's visual experience. In particular, it can achieve faster brightness adjustment response in scenes with large changes in ambient light, such as from indoors to outdoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a schematic diagram of a first embodiment of a display device provided in the present application.

[0020] Figure 2 yes Figure 1 Schematic diagram of a first photodiode of a display device shown.

[0021] Figure 3 yes Figure 2 A cross-sectional view of the first photodiode taken along line AA' is shown.

[0022] Figure 4 yes Figure 2 A cross-sectional view of the first photodiode taken along line BB' is shown.

[0023] Figure 5 2 is a schematic diagram of a second embodiment of a display device provided in the present application.

[0024] Figure 6 yes Figure 1 and Figure 2 Schematic diagram of a driver chip of a display device shown.

[0025] Figure 7 2 is a schematic diagram of a third embodiment of a display device provided in the present application.

[0026] Figure 8 yes Figure 7 Schematic diagram of a driver chip of a display device shown. DETAILED DESCRIPTION

[0027] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0028] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise expressly limited.

[0029] The embodiments of the present application may be combined with each other.

[0030] An embodiment of the present application provides a display device that integrates photosensitive diodes 1011 and 1012 into an array substrate of a display panel 101 to achieve an ambient light sensing function, thereby solving the technical problems in the prior art of requiring additional photosensitive components, resulting in increased costs, and the space around the front camera being occupied by light sensing sensors, resulting in the inability to install a larger camera.

[0031] The display device provided in the embodiments of the present application may be, for example, an OLED display device, a Mini-LED display device, or a Micro-LED display device. The embodiments of the present application are described using an OLED display device as an example.

[0032] The display device includes a display panel 101, a timing controller (not shown), and a driver chip 102, which can be, for example, a source driver chip. The display panel 101 includes an array substrate, which includes a semiconductor layer 10111 and a gate layer 10112. Photosensitive diodes 1011 and 1012 are disposed within the array substrate. Each photosensitive diode 1011 and 1012 comprises a PN junction diode formed by the semiconductor layer 10111 and the gate layer 10112. Metal traces are electrically connected to the photosensitive diodes 1011 and 1012. The driver chip 102 is electrically connected to the metal traces and is configured to send sampling signals to the photosensitive diodes 1011 and 1012, receive sensing signals from the photosensitive diodes 1011 and 1012, generate ambient light brightness information based on the sensing signals, and adjust the brightness of the display panel 101 based on the ambient light brightness information.

[0033] The display panel 101 includes a gate drive circuit and a plurality of pixels. The gate drive circuit includes a multi-stage cascaded gate drive sub-circuit. The display panel 101 includes a display area and a non-display area. The display area is provided with a plurality of pixels arranged in an array, and the non-display area is located around the display area. The display panel 101 also includes a plurality of gate lines, a plurality of data lines, a plurality of light-emitting control signal lines and a gate drive circuit. The plurality of gate lines and the plurality of light-emitting control signal lines extend along a first direction and are arranged along a second direction, and the plurality of data lines extend along the second direction and are arranged along the first direction, and the first direction is perpendicular to the second direction. The gate drive circuit is provided in the non-display area and is electrically connected to the plurality of gate lines. The source drive chip is electrically connected to the plurality of data lines through a flexible circuit board. The timing controller is electrically connected to the gate drive circuit and the source drive chip.

[0034] The display panel 101 includes an organic light-emitting diode array substrate and an encapsulation layer. The organic light-emitting diode array substrate includes a substrate, a buffer layer disposed on the substrate, a semiconductor layer 10111 disposed on the buffer layer, a gate insulating layer disposed on the semiconductor layer 10111, a first metal layer disposed on the gate insulating layer, an interlayer insulating layer disposed on the first metal layer, a second metal layer disposed on the interlayer insulating layer, a planarization layer disposed on the second metal layer, a first electrode layer disposed on the planarization layer, a pixel defining layer disposed on the first electrode layer, an organic light-emitting layer disposed within an opening defined by the pixel defining layer, and a second electrode layer disposed on the organic light-emitting layer. The first metal layer includes gate lines and a gate electrode. The second metal layer includes data lines, a source electrode, and a drain electrode. The encapsulation layer is hermetically connected to the organic light-emitting diode array substrate.

[0035] Each pixel includes a pixel driving circuit and a light-emitting device. The pixel driving circuit includes at least two transistors and a storage capacitor. One of the transistors functions as a switching transistor, with its gate electrically connected to the corresponding gate line and its source electrically connected to the corresponding data line. The other transistor functions as a driving transistor, with its gate electrically connected to the drain of the switching transistor, its source electrically connected to the first power supply voltage line, and its drain electrically connected to the anode of the light-emitting device. One end of the storage capacitor is electrically connected to the gate of the driving transistor, and the other end is electrically connected to the source or drain of the driving transistor. The cathode of the light-emitting device is electrically connected to the second power supply voltage line.

[0036] The core components of the photodiodes 1011 and 1012 are PN junction diodes, such as Figures 2 to 4As shown, the present application incorporates PN junction diodes within the film layer of the array substrate of the display panel 101, thereby integrating photodiodes 1011 and 1012 into the display panel 101 and enabling the display panel 101 to sense ambient light. The core invention of this application lies in utilizing the semiconductor layer 10111 already present during the display panel 101 manufacturing process as the substrate for the photodiodes 1011 and 1012, combined with a gate layer 10112 to form a PN junction diode, eliminating the need for additional photosensitive component assembly processes. The array substrate also includes a source / drain layer 10113, with metal traces located in the same film layer as the source / drain layer 10113 or the gate layer 10112. The array substrate also includes through-holes, through which metal traces are electrically connected to the semiconductor layer 10111, transmitting sampling signals from the driver chip 102. The semiconductor layer 10111 is a polysilicon layer or a metal oxide layer (e.g., IGZO). The PN junction characteristics of the photosensitive diodes 1011 and 1012 cause them to exhibit different resistance characteristics under different light intensities. When there is no light, the PN junction is in a reverse biased state, the impedance is extremely large, and almost no current passes through; when there is light, the photon energy excites the electron-hole pairs in the semiconductor layer 10111, so that the conductivity of the PN junction increases with the increase of light intensity, thereby realizing the photoelectric conversion function.

[0037] The display panel 101 includes a display area and a non-display area located outside the display area. Photodiodes 1011 and 1012 are disposed within the display area or the non-display area. The display panel 101 includes at least two photodiodes 1011 and 1012. The at least two photodiodes 1011 and 1012 include a first photodiode 1011 and a second photodiode 1012. The first photodiode 1011 is disposed on one side of the display area, and the second photodiode 1012 is disposed on the other side of the display area. This allows for more comprehensive sensing of ambient light from different directions, improving the accuracy and reliability of ambient light detection.

[0038] In the first embodiment, as Figure 1As shown, the display panel 101 includes a metal trace (first metal trace 1013) that surrounds the display area. The two ends of the metal trace (first metal trace 1013) are electrically connected to two ports of the driver chip 102. The metal trace (first metal trace 1013) includes a first trace segment 10131, a second trace segment 10132, and a third trace segment 10133. The first trace segment 10131 connects the first photosensitive diode 1011 and the first port 1021 of the driver chip 102. The second trace segment 10132 connects the second photosensitive diode 1012 and the second port 1022 of the driver chip 102. The third trace segment 10133 connects the first photosensitive diode 1011 and the second photosensitive diode 1012. A sampling signal is output from a first port 1021 on one side of the driver chip 102. After passing through the photodiodes 1011 and 1012, the second port 1022 on the other side of the driver chip 102 collects the voltage of the sensed signal. When the photodiodes 1011 and 1012 are not exposed to light, their impedance is very high, even being in a cutoff state, preventing the driver chip 102 from transmitting the signal. When light shines on the photodiodes 1011 and 1012, their impedance varies with light intensity. Stronger light leads to lower impedance, and the driver chip 102 collects voltages of varying levels depending on the light intensity.

[0039] In the second embodiment, as Figure 5 As shown, the display panel 101 also includes a camera opening area. A detection trace 1015 is disposed outside the camera opening area. A metal trace (second metal trace 1014) is electrically connected to the detection trace 1015. The metal trace (second metal trace 1014) includes a fourth trace segment 10141, a fifth trace segment 10142, a sixth trace segment 10143, and a seventh trace segment 10144. The fourth trace segment 10141 connects the first photodiode 1011 and the first port 1021 of the driver chip 102. The fifth trace segment 10142 connects the first photodiode 1011 and one end of the detection trace 1015. The sixth trace segment 10143 connects the second photodiode 1012 and the other end of the detection trace 1015. The seventh trace segment 10144 connects the second photodiode 1012 and the second port 1022 of the driver chip 102. The detection trace 1015 is located in the same film layer as the traces of the source and drain electrode layer 10113. This allows the functions of crack detection in the camera opening area and sensing ambient light brightness to be integrated, saving trace space on the display panel 101.

[0040] For the first and second embodiments, Figure 6As shown, the driver chip 102 includes an amplifier filter, an analog-to-digital converter (ADC), a brightness register, and a drive signal generator. The amplifier filter amplifies the sensed signal, the ADC generates ambient light brightness information from the sensed signal, and the ambient light brightness information is a digital signal. The brightness register stores the correspondence between the ambient light brightness and the brightness of the display panel 101. The drive signal generator searches the brightness register for the target brightness value of the display panel 101 based on the ambient light brightness information and generates a drive signal (e.g., a grayscale signal) to be output to the display panel 101 based on the target brightness value to adjust the brightness of the display panel 101. A sampling signal is output from a first port 1021 on the left side of the driver chip 102. After passing through photodiodes 1011 and 1012, it returns to a second port 1022 on the other side of the driver chip 102 to collect the current voltage of the sensed signal. The voltage of the sensed signal is amplified by the amplifier filter within the driver chip 102, and then converted by the ADC within the driver chip 102 into a digital signal of ambient light brightness information. The brightness register then searches the correspondence table between ambient light brightness and the brightness of the display panel 101. The brightness of the display panel 101 is adjusted according to the brightness of the current ambient light.

[0041] In the third embodiment, Figure 7 As shown, two metal traces are provided on the left and right sides of the display panel 101. One metal trace is connected to a photodiode. The two metal traces include a third metal trace 1016 and a fourth metal trace 1017. The third metal trace 1016 includes an eighth trace segment 10161 and a ninth trace segment 10162, and the fourth metal trace 1017 includes a tenth trace segment 10171 and an eleventh trace segment 10172. The eighth routing segment 10161 connects the first photosensitive diode 1011 and the first port 1021 of the driver chip 102, the ninth routing segment 10162 connects the first photosensitive diode 1011 and the third port 1023 of the driver chip 102, the tenth routing segment 10171 connects the second photosensitive diode 1012 and the second port 1022 of the driver chip 102, and the eleventh routing segment 10172 connects the second photosensitive diode 1012 and the fourth port 1024 of the driver chip 102.

[0042] For the third embodiment, Figure 8As shown, the driver chip 102 includes a differential amplifier filter, an analog-to-digital converter, a brightness register, and a drive signal generator. The differential amplifier filter is used to differentially amplify the sensing signals of the first photodiode 1011 and the second photodiode 1012. The analog-to-digital converter is used to generate ambient light brightness information from the sensing signals. The ambient light brightness information is a digital signal. The brightness register is used to store the correspondence between the ambient light brightness and the brightness of the display panel 101. The drive signal generator is used to search the brightness register for a target brightness value based on the ambient light brightness information and generate a drive signal to be output to the display panel 101 based on the target brightness value. For the driver chip 102, there are two signal voltage inputs. The differential amplifier filter compares the voltages of the two input signals, eliminates signal noise, and improves the accuracy of the signal voltage. After being processed by the differential amplifier filter, the sensing signal is sent to the analog-to-digital converter, which converts the analog sensing signal into a digital signal of ambient light brightness information. The driving signal generator searches the pre-stored correspondence table between ambient light brightness and display panel 101 brightness in the brightness register according to the ambient light brightness information, determines the target brightness value of the display panel 101 corresponding to the current ambient light brightness level, and generates a corresponding driving signal to adjust the brightness of the display panel 101.

[0043] The gate drive circuit includes multiple cascaded gate drive sub-circuits, each of which is electrically connected to a gate line. Under the control of the timing controller, the gate drive sub-circuit sequentially outputs scan signals to scan each row of pixels in the display area line by line. Under the control of the timing controller, the source driver chip generates and outputs data signals based on the image data. The timing controller is used to receive and process externally input image data and timing signals, generate control signals, and transmit the image data to the source driver chip. The power management chip is used to provide operating voltages for various parts of the display device, including providing a second power supply voltage for the cathode of the light-emitting device, providing a first power supply voltage for the first power supply voltage line, and providing a gate drive voltage for the gate drive circuit.

[0044] When the display panel 101 is a low-temperature polysilicon display panel, the photodiodes 1011 and 1012 are provided using the polysilicon semiconductor layer 10111 and the gate layer 10112. When the display panel 101 is a low-temperature polycrystalline oxide display panel, the photodiodes 1011 and 1012 are provided using the polysilicon semiconductor layer 10111 and the gate layer 10112, or using an indium gallium zinc oxide layer and the gate layer 10112.

[0045] When the photodiodes 1011 and 1012 are not exposed to light, they are in a cut-off state. When exposed to light of different intensities, the photodiodes 1011 and 1012 are turned on to different degrees, and the impedance of the photodiodes 1011 and 1012 themselves changes accordingly, and the sensed signal transmitted back also changes accordingly. The driver chip 102 converts the voltage amplitude level into the ambient light brightness level, and the correspondence between the ambient light brightness and the screen brightness is pre-stored in the brightness register to form a correspondence table. When the driver chip 102 obtains the current ambient light brightness, it calls out the preset brightness from the brightness register to achieve adaptive adjustment of the brightness of the display panel 101.

[0046] In actual applications, when the display panel 101 is in a high-brightness display state, the strong light emitted by the display panel 101 itself will interfere with the ambient light sensing of the photosensitive diodes 1011 and 1012, causing the photosensitive diodes 1011 and 1012 to be unable to accurately distinguish between the ambient light and the self-luminescence of the display panel 101, thereby affecting the accuracy of the ambient light brightness detection.

[0047] To address the aforementioned technical issues, the present application provides a light-shielding layer above the photodiodes 1011 and 1012. The light-shielding layer comprises a first light-shielding portion and a second light-shielding portion. The first light-shielding portion is disposed above the first photodiode 1011, and the second light-shielding portion is disposed above the second photodiode 1012. The light-shielding layer is made of an opaque material and is located on the same film layer as the pixel-defining layer of the display panel 101. The light-shielding layer includes multiple light-transmitting holes, which are circular or square in shape. The light-transmitting holes transmit only ambient light from directly above the display panel 101 and block stray light from the sides and interior of the display panel 101. The edges of the light-shielding layer extend downward to form light-shielding walls, which surround the photodiodes 1011 and 1012 to further block interference from lateral light. The light-shielding layer is made of an aluminum alloy or a molybdenum alloy and is formed by sputtering or vapor deposition. The surface of the light-shielding layer undergoes an anti-reflection treatment to reduce reflection of ambient light on the surface of the light-shielding layer. The inner wall of the light-transmitting hole is blackened to prevent multiple reflections of light in the hole. A transparent insulating layer is provided between the light-shielding layer and the photodiodes 1011 and 1012 to protect the photodiodes 1011 and 1012 from damage during the manufacturing process.

[0048] In practical applications, when the display panel 101 is subject to external electromagnetic interference, the sensing signal transmitted in the metal wiring is easily affected by the electromagnetic noise, resulting in distortion of the sensing signal, thereby affecting the accuracy of the ambient light brightness information.

[0049] To address the above technical issues, the present application provides a shielding layer around the metal traces. The shielding layer includes a first shielding portion and a second shielding portion. The first shielding portion surrounds the first metal trace 1013, and the second shielding portion surrounds the second metal trace 1014. The shielding layer is made of a conductive material and is electrically connected to the ground layer of the array substrate. The shielding layer is arranged in a grid or strip pattern. The shielding layer also includes multiple grounding vias, which connect the shielding layer to the grounding wires of different film layers of the array substrate, forming a multi-layer grounding network. The grounding vias are evenly distributed along the extension direction of the metal traces, and the spacing of the grounding vias is determined by the signal frequency and the trace length. The conductive material of the shielding layer is copper alloy or silver alloy, and the shielding layer is formed by electroplating or physical vapor deposition. The surface of the shielding layer is passivated to prevent oxidation and corrosion. A low-dielectric-constant insulating material is filled between the shielding layer and the metal traces to reduce parasitic capacitance between the shielding layer and the metal traces. The edges of the shielding layer adopt a gradual transition shape to avoid the electric field concentration effect caused by sharp edges.

[0050] In actual applications, when different areas of the display panel 101 display image content of different brightness, uneven light distribution will be generated inside the display panel 101, resulting in differences in the ambient light intensity received by the photosensitive diodes 1011 and 1012 set at different positions in the display area, thereby affecting the consistency of ambient light brightness detection.

[0051] To solve the above technical problems, the present application provides multiple photosensitive diode groups in the display panel 101, each photosensitive diode group includes at least four photosensitive diodes, and the multiple photosensitive diode groups are distributed at different positions in the display area. The photosensitive diode groups are arranged in a matrix. The photosensitive diodes in each photosensitive diode group include a first photosensitive diode, a second photosensitive diode, a third photosensitive diode, and a fourth photosensitive diode. The anode of the first photosensitive diode is electrically connected to the anode of the third photosensitive diode to form a first differential output terminal, the anode of the second photosensitive diode is electrically connected to the anode of the fourth photosensitive diode to form a second differential output terminal, the cathode of the first photosensitive diode is electrically connected to the cathode of the second photosensitive diode, and the cathode of the third photosensitive diode is electrically connected to the cathode of the fourth photosensitive diode. The voltage difference between the first differential output terminal and the second differential output terminal is output as the differential sensing signal of the photosensitive diode group.

[0052] The driver chip 102 includes a multi-channel signal processing unit and a weight calculation module. The multi-channel signal processing unit includes multiple independent signal amplifiers and filters. The positive input of each signal amplifier is electrically connected to the first differential output of the corresponding photodiode group, the negative input of each signal amplifier is electrically connected to the second differential output of the corresponding photodiode group, the output of each signal amplifier is electrically connected to the input of the corresponding filter, and the output of the filter outputs the amplified and filtered sensing signal. The weight calculation module includes a brightness detector and a weight allocator. The brightness detector is electrically connected to the pixel driving circuit of the display panel 101. The brightness detector obtains the brightness of the display content at the location of each photodiode group by monitoring the driving current of the pixel driving circuit. The output of the brightness detector is electrically connected to the input of the weight allocator. The weight allocator calculates the weight coefficient of each group of sensing signals based on the received brightness information.

[0053] The driver chip 102 also includes a signal fusion device, which includes a weighted summation circuit and a normalization processing circuit. The weighted summation circuit includes multiple multipliers and a summer. The first input end of each multiplier is electrically connected to the output end of the corresponding filter to receive a sensing signal, and the second input end of each multiplier is electrically connected to the corresponding output end of the weight distributor to receive a weight coefficient. The output end of each multiplier is electrically connected to the corresponding input end of the summer. The summer adds the output signals of each multiplier and outputs a weighted sum signal. The output end of the summer is electrically connected to the input end of the normalization processing circuit. The normalization processing circuit performs amplitude normalization processing on the weighted sum signal to generate comprehensive ambient light brightness information.

[0054] The weight allocator dynamically adjusts the weight coefficient according to the real-time brightness distribution of the displayed content. The weight allocator includes a brightness comparator and a weight calculator. The brightness comparator compares the display brightness of each photodiode group with a preset brightness threshold. When the display brightness is higher than the preset brightness threshold, the weight calculator reduces the weight coefficient of the corresponding photodiode group. When the display brightness is lower than the preset brightness threshold, the weight calculator increases the weight coefficient of the corresponding photodiode group. The weight calculator uses a linear interpolation algorithm to calculate the specific weight coefficient value based on the brightness difference.

[0055] The signal fusion device also includes an outlier detection circuit, which includes a threshold comparator and a signal selector. The input end of the threshold comparator is electrically connected to the output end of each filter. The threshold comparator compares each group of sensing signals with a preset normal signal range. When the sensing signal exceeds the normal range, the threshold comparator outputs an abnormal identification signal. The control end of the signal selector is electrically connected to the output end of the threshold comparator. The signal selector eliminates the abnormal sensing signal from the weighted summation operation according to the abnormal identification signal. The output end of the signal selector is electrically connected to the input end of the weighted summation circuit.

[0056] The above is a detailed introduction to the embodiments of the present application. The contents of this specification should not be understood as limiting the scope of protection of the present application.

Claims

1. A display device, characterized in that: The display device includes a display panel and a driving chip, wherein the display panel includes: An array substrate comprising a semiconductor layer and a gate layer; a photosensitive diode, the photosensitive diode being disposed in the array substrate, the photosensitive diode comprising a PN junction diode formed by the semiconductor layer and the gate layer; and a metal trace electrically connected to the photodiode; The driver chip is electrically connected to the metal traces, and is used to send a sampling signal to the photodiode and receive a sensing signal from the photodiode, and to generate ambient light brightness information according to the sensing signal and adjust the brightness of the display panel according to the ambient light brightness information.

2. The display device according to claim 1, wherein The display panel includes a display area and a non-display area located outside the display area, and the photosensitive diode is arranged in the display area or in the non-display area.

3. The display device according to claim 1, wherein The display panel includes at least two photosensitive diodes, and the at least two photosensitive diodes include a first photosensitive diode and a second photosensitive diode. The first photosensitive diode is arranged on one side of the display area, and the second photosensitive diode is arranged on the other side of the display area.

4. The display device according to claim 1, wherein The display panel includes a metal wiring, the metal wiring surrounds the display area, and two ends of the metal wiring are electrically connected to the two ports of the driving chip respectively.

5. The display device according to claim 3, wherein The metal routing includes a first routing segment, a second routing segment, and a third routing segment. The first routing segment connects the first photosensitive diode and the first port of the driver chip, the second routing segment connects the second photosensitive diode and the second port of the driver chip, and the third routing segment connects the first photosensitive diode and the second photosensitive diode.

6. The display device according to claim 3, wherein: The display panel further includes a camera opening area, a detection line is provided outside the camera opening area, and the metal line is electrically connected to the detection line.

7. The display device according to claim 6, wherein: The metal routing includes a fourth routing segment, a fifth routing segment, a sixth routing segment, and a seventh routing segment. The fourth routing segment connects the first photosensitive diode and the first port of the driver chip, the fifth routing segment connects the first photosensitive diode and the detection routing, the sixth routing segment connects the second photosensitive diode and the detection routing, and the seventh routing segment connects the second photosensitive diode and the second port of the driver chip.

8. The display device according to claim 4, wherein: The driver chip includes an amplifying filter, an analog-to-digital converter, a brightness register, and a driving signal generator. The amplifying filter is used to amplify the sensing signal. The analog-to-digital converter is used to generate the ambient light brightness information from the sensing signal. The ambient light brightness information is a digital signal. The brightness register is used to store the correspondence between the ambient light brightness and the display panel brightness. The driving signal generator is used to search the target brightness value from the brightness register according to the ambient light brightness information, and generate a driving signal to be output to the display panel according to the target brightness value.

9. The display device according to claim 3, wherein: The display panel includes two metal routing lines, the two metal routing lines include a third metal routing line and a fourth metal routing line, the third metal routing line includes an eighth routing line segment and a ninth routing line segment, the fourth metal routing line includes a tenth routing line segment and an eleventh routing line segment, the eighth routing line segment connects the first photosensitive diode and the first port of the driver chip, the tenth routing line segment connects the second photosensitive diode and the second port of the driver chip, the ninth routing line segment connects the first photosensitive diode and the third port of the driver chip, and the eleventh routing line segment connects the second photosensitive diode and the fourth port of the driver chip.

10. The display device according to claim 9, wherein: The driver chip includes a differential amplifier filter, an analog-to-digital converter, a brightness register and a drive signal generator. The differential amplifier filter is used to perform differential amplification processing on the sensing signals of the first photosensitive diode and the second photosensitive diode. The analog-to-digital converter is used to generate the ambient light brightness information from the sensing signals. The ambient light brightness information is a digital signal. The brightness register is used to store the correspondence between the ambient light brightness and the display panel brightness. The drive signal generator is used to search the target brightness value from the brightness register according to the ambient light brightness information, and generate a drive signal to be output to the display panel according to the target brightness value.

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