Display module and display device

Abstract

The utility model provides a display module and a display device, relates to the technical field of display, and aims to solve the problem that the display quality of a display product cannot be effectively improved according to the detected light intensity due to the fact that a light sensing structure arranged in the display product in the prior art is low in light intensity detection precision. The display module comprises an array substrate, the array substrate comprises a light sensing module, a detection chip, a sensing signal transmission line and a common electrode layer, and the light sensing module is used for sensing the light intensity of an external environment and generating a sensing signal; the sensing signal transmission line is respectively coupled with the light sensing module and the detection chip, the sensing signal transmission line is used for transmitting a sensing signal to the detection chip, and the detection chip is used for determining the light intensity of the external environment according to the sensing signal; the orthographic projection of the common electrode layer on a substrate body of the array substrate is not overlapped with the orthographic projection of the light sensing module on the substrate body, and is not overlapped with the orthographic projection of the sensing signal transmission line on the substrate body.

Description

Technical Field

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

[0002] With the continuous development of display technology, various fields have increasingly higher requirements for the display quality of display products. At the same time, controlling the production costs of display products has also become a key issue. To improve the display quality of display products, related technologies have set up light-sensing structures within display products. These light-sensing structures sense the light intensity in the display product's application environment and adjust the display brightness of the display product based on the light intensity. However, the light-sensing structures set up within display products in related technologies have low light intensity detection accuracy, and the light intensity detected based on this detection cannot effectively improve the display quality of the display product. Utility Model Content

[0003] The purpose of the present invention is to provide a display module and a display device for solving the problem in the related art that the light intensity detection accuracy of the light sensing structure set in the display product is low and the display quality of the display product cannot be effectively improved based on the detected light intensity.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0005] A first aspect of the present invention provides a display module, comprising an array substrate, wherein the array substrate comprises:

[0006] A light sensing module, which is used to sense the intensity of ambient light and generate a sensing signal;

[0007] a detection chip and a sensing signal transmission line, wherein the sensing signal transmission line is coupled to the light sensing module and the detection chip respectively, the sensing signal transmission line is used to transmit the sensing signal to the detection chip, and the detection chip is used to determine the external ambient light intensity according to the sensing signal;

[0008] A common electrode layer, wherein the orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the light sensing module on the base substrate, and does not overlap with the orthographic projection of the sensing signal transmission line on the base substrate.

[0009] Optionally, the light sensing module includes at least two groups of light sensing units, and the light sensing units include a plurality of light sensing transistors connected in parallel;

[0010] The array substrate includes at least two sensing signal transmission lines, and the sensing signal transmission lines are coupled to output electrodes of the photosensitive transistors included in a corresponding group of photosensitive units;

[0011] The array substrate further includes a first signal transmission line and a second signal transmission line; the first signal transmission line is respectively coupled to the control electrode of each photosensitive transistor included in each group of photosensitive units; the second signal transmission line is respectively coupled to the input electrode of each photosensitive transistor included in each group of photosensitive units;

[0012] The detection chip is coupled to the first signal transmission line and the second signal transmission line respectively;

[0013] The orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the first signal transmission line on the base substrate; and / or, the orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the second signal transmission line on the base substrate.

[0014] Optionally, the array substrate further includes:

[0015] A flexible circuit board is provided on the base substrate, and includes a first signal input terminal and a second signal input terminal, wherein the first signal input terminal is coupled to the first signal transmission line, and the second signal input terminal is coupled to the second signal transmission line.

[0016] Optionally, the flexible circuit board further includes:

[0017] A first signal regulating circuit is coupled to the first signal input terminal, the first signal transmission line and the ground signal input terminal respectively, and is used to regulate the voltage value of the first signal received by the first signal transmission line.

[0018] Optionally, the first signal conditioning circuit includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is coupled to the ground signal input terminal, the second end of the fourth resistor is coupled to the first signal transmission line, the first end of the fifth resistor is coupled to the first signal transmission line, and the second end of the fifth resistor is coupled to the first signal input terminal.

[0019] Optionally, the flexible circuit board further includes:

[0020] The second signal regulating circuit is respectively coupled to the second signal input terminal, the second signal transmission line and the ground signal input terminal, and is used to regulate the voltage value of the second signal received by the second signal transmission line.

[0021] Optionally, the second signal conditioning circuit includes a second resistor and a third resistor, the first end of the second resistor is coupled to the ground signal input terminal, the second end of the second resistor is coupled to the second signal transmission line, the first end of the third resistor is coupled to the second signal transmission line, and the second end of the third resistor is coupled to the second signal input terminal.

[0022] Optionally, the display module includes a display area and a peripheral area located around the display area;

[0023] The common electrode layer includes a first common electrode layer and a second common electrode layer, at least a portion of the first common electrode layer is located in the display area, and the second common electrode layer is located in the peripheral area;

[0024] The orthographic projection of the photosensitive module on the base substrate is located between the orthographic projection of the first common electrode layer on the base substrate and the orthographic projection of the second common electrode layer on the base substrate.

[0025] Optionally, a first distance d1 is formed between the first common electrode layer and the second common electrode layer, and d1 satisfies: d1>136 μm;

[0026] The second common electrode layer has a first width d2 perpendicular to its own extension direction, and d2 satisfies: d2>10μm;

[0027] A second distance d3 is formed between the orthographic projection of the second common electrode layer on the base substrate and the orthographic projection of the sensing signal transmission line on the base substrate, and d3 satisfies: d3>2 μm.

[0028] Optionally, the array substrate further includes a light shielding layer, which is located between the light sensing module and the base substrate, and the orthographic projection of the light sensing module on the base substrate is located inside the orthographic projection of the light shielding layer on the base substrate.

[0029] Optionally, the light sensing module includes a first light sensing unit and at least one second light sensing unit;

[0030] The display module further includes a color filter substrate, which includes at least one color filter pattern and a black matrix layer; the color filter substrate is arranged opposite to the array substrate, and the color filter pattern and the black matrix layer are close to the array substrate;

[0031] The orthographic projection of the color film pattern on the base substrate at least partially overlaps with the orthographic projection of the corresponding second photosensitive unit on the base substrate; the orthographic projection of the black matrix layer on the base substrate does not overlap with the orthographic projection of the second photosensitive unit on the base substrate, and the orthographic projection of the black matrix layer on the base substrate covers the orthographic projection of the first photosensitive unit on the base substrate.

[0032] Optionally, the photosensitive module includes three second photosensitive units; the color film substrate includes a red color film pattern, a green color film pattern and a blue color film pattern, the orthographic projection of the red color film pattern on the base substrate at least partially overlaps with the orthographic projection of the first second photosensitive unit on the base substrate, the orthographic projection of the green color film pattern on the base substrate at least partially overlaps with the orthographic projection of the second second photosensitive unit on the base substrate, and the orthographic projection of the blue color film pattern on the base substrate at least partially overlaps with the orthographic projection of the third second photosensitive unit on the base substrate.

[0033] Based on the technical solution of the above-mentioned display module, a second aspect of the present invention provides a display device including the above-mentioned display module.

[0034] In the technology provided by the present utility model, the orthographic projection of the common electrode layer on the base substrate of the array substrate is set to not overlap with the orthographic projection of the photosensitive module on the base substrate, and does not overlap with the orthographic projection of the sensing signal transmission line on the base substrate; the orthographic projection of the common electrode layer on the base substrate of the array substrate is set to not overlap with the orthographic projection of the first signal transmission line on the base substrate; the orthographic projection of the common electrode layer on the base substrate of the array substrate is set to not overlap with the orthographic projection of the second signal transmission line on the base substrate.

[0035] The above-mentioned setting method realizes the removal of the common electrode layer in the overlapping area directly above the photosensitive module, the photosensitive signal transmission line, the first signal transmission line and the second signal transmission line, so that the voltage at the detected drain end will not be affected by the voltage fluctuation of the common electrode layer; when the same display module displays different pictures, the voltage value of the sensing signal remains unchanged, that is, the external ambient light intensity calculated by the detection chip of the same display module is not affected by the type of display picture, but is only affected by the external ambient light, thereby effectively improving the accuracy of the display module in identifying the external ambient light intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0037] Figure 1 Schematic diagram of simulation of voltage signals of the common electrode layer and the sensing signal sensed by the light sensing structure when the display module displays a white image under the condition of an ambient light intensity of 400 lux in the related art;

[0038] Figure 2 Schematic diagram of simulation of voltage signals of a common electrode layer and a sensing signal sensed by a light sensing structure when the display module displays a heavy-load image under an ambient light intensity of 400 lux in the related art;

[0039] Figure 3 A schematic diagram of the layout of a display module provided in an embodiment of the present utility model;

[0040] Figure 4 A front view of a common electrode layer and a light sensing module provided in an embodiment of the present utility model, wherein the common electrode layer and the light sensing module do not overlap;

[0041] Figure 5 A side view of a common electrode layer and a light sensing module provided in an embodiment of the present utility model, wherein the common electrode layer and the light sensing module do not overlap;

[0042] Figure 6 A schematic diagram of a simulation of the voltage signal of the common electrode layer and the voltage signal sensed by the light-sensing structure when the display module displays a white image under the condition of an ambient light intensity of 400 lux provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of the layout of the array substrate provided in the upper frame according to an embodiment of the present utility model;

[0044] Figure 8 A schematic cross-sectional view of a display module provided by an embodiment of the present utility model;

[0045] Figure 9 A schematic diagram of the overlap of a light sensing unit and a color film pattern provided by an embodiment of the present utility model;

[0046] Figure 10 This is a schematic diagram of the layout of each resistor pin provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0047] In order to further illustrate the display module and display device provided by the embodiments of the present invention, a detailed description is given below with reference to the accompanying drawings.

[0048] Research has found that the light-sensing structure is coupled to the detection chip via a signal transmission line. The light-sensing structure senses ambient light and generates a sensing signal, which is then transmitted via the signal transmission line to the detection chip, which then determines the ambient light intensity based on the sensing signal. Because the light-sensing structure and the signal transmission line both spatially overlap with the common electrode layer in the display product, a capacitor forms between the signal transmission line and the common electrode layer in the overlapping area. Due to the bootstrapping effect of the capacitor, voltage fluctuations in the common electrode layer can easily affect the voltage of the signal transmitted by the signal transmission line, resulting in an anomaly in the sensing signal transmitted by the signal transmission line and affecting the accuracy of the final determination of ambient light intensity.

[0049] In more detail, for a-Si display modules (i.e., display modules made using amorphous silicon thin films through a "low-temperature" crystallization process to form polycrystalline silicon), the voltage of the common electrode layer in different a-Si display modules varies greatly, such as a difference of about 1V. This causes the voltage of the sensing signal transmitted by the signal transmission line to vary greatly, that is, the voltage of the sensing signal transmitted by the signal transmission line between different display modules varies greatly. For LCD display modules, when displaying different images, the voltage of the common electrode layer in the LCD display module is also different. This is because the voltage of the data signal of different images is different, which has a certain coupling effect on the voltage of the common electrode layer, resulting in differences in the voltage of the common electrode layer. Therefore, when various types of display modules are actually used, the voltage of the common electrode layer is very easy to fluctuate. Affected by the capacitive coupling of the common electrode layer in the overlapping area, the voltage of the sensing signal fluctuates greatly, resulting in low accuracy of the sensing signal detected by the detection chip.

[0050] See also Figure 1 Under ambient light intensity of 400 lux, when the display module displays a white screen, the voltage on the common electrode layer is -2.481V. During the detection phase, as the voltage on the common electrode layer is pulled up from -2.481V to GND, the voltage of the sensing signal from the light-sensing structure is also pulled up to 1.82V. It should be noted that both light sensing and touch detection are performed on blank non-display rows within a frame, during which the voltage level of the common electrode layer is pulled from the common electrode layer voltage to GND.

[0051] See also Figure 2 Under the condition of 400 lux of ambient light, when the display module displays a heavy-load image, the voltage of the common electrode layer is -2.601V (due to the difference in voltage with the white image data signal, there is a certain coupling effect on the common electrode layer, resulting in a certain difference in the voltage of the common electrode layer). During the detection phase, the voltage of the sensing signal sensed by the light-sensing structure is 2.14V.

[0052] Because the voltage of the sensing signal is affected by voltage fluctuations in the common electrode layer, under the same ambient light environment, when the same display module displays different images, the different voltages in the common electrode layer lead to different coupling voltages between the common electrode layer and the signal transmission line. Consequently, when the same display module displays different images under the same ambient light intensity, the detected and calculated ambient light intensity varies. This results in an error of more than 50% in the calculated and detected ambient light intensity when the same display module displays different images under fixed ambient light conditions, failing to meet the actual requirement of less than 15%.

[0053] See also Figures 3 to 5 The present invention provides a display module, including an array substrate, wherein the array substrate includes:

[0054] The light sensing module 10 is used to sense the intensity of the external ambient light and generate a sensing signal;

[0055] A detection chip 20 and a sensing signal transmission line 30, wherein the sensing signal transmission line 30 is coupled to the light sensing module 10 and the detection chip 20 respectively, and the sensing signal transmission line 30 is used to transmit the sensing signal to the detection chip 20, and the detection chip 20 is used to determine the external ambient light intensity according to the sensing signal;

[0056] The common electrode layer 40 has an orthographic projection on the base substrate of the array substrate that does not overlap with the orthographic projection of the light sensing module 10 on the base substrate, and does not overlap with the orthographic projection of the sensing signal transmission line 30 on the base substrate.

[0057] Exemplarily, the array substrate includes a display area AA and a peripheral area surrounding the display area AA, and the light sensing module 10, the detection chip 20, and the sensing signal transmission line 30 are all located in the peripheral area. For example, the peripheral area includes an upper frame area and a lower frame area, the display area AA is located between the upper frame area and the lower frame area, the detection chip 20 is located in the lower frame area, and the light sensing module 10 is located in the upper frame area, but the present invention is not limited thereto.

[0058] like Figures 3 to 5 As shown, illustratively, the light sensing module 10 includes at least two groups of light sensing units (such as Figure 8 The first photosensitive unit 101, the first second photosensitive unit 102a, the second second photosensitive unit 102b, and the third second photosensitive unit 102c are provided in the array substrate, wherein the photosensitive unit includes a plurality of photosensitive transistors connected in parallel; the array substrate includes at least two sensing signal transmission lines 30, and the sensing signal transmission lines 30 are coupled to the output electrodes of the photosensitive transistors TFT included in the corresponding group of photosensitive units;

[0059] The array substrate also includes a first signal transmission line 31 and a second signal transmission line 32; the first signal transmission line 31 is respectively coupled to the control electrode of each photosensitive transistor included in each group of photosensitive units; the second signal transmission line 32 is respectively coupled to the input electrode of each photosensitive transistor included in each group of photosensitive units; the detection chip 20 is respectively coupled to the first signal transmission line 31 and the second signal transmission line 32; the orthographic projection of the common electrode layer 40 on the base substrate of the array substrate does not overlap with the orthographic projection of the first signal transmission line 31 on the base substrate; and / or the orthographic projection of the common electrode layer 40 on the base substrate of the array substrate does not overlap with the orthographic projection of the second signal transmission line 32 on the base substrate.

[0060] like Figure 3 As shown, each pin Pin1 of the detection chip is coupled to the corresponding signal transmission line.

[0061] Exemplarily, the light sensing unit includes a plurality of light sensing transistors connected in parallel. The specific number of the plurality of light sensing transistors can be set according to actual needs, for example, 1500, 3000, etc., but not limited thereto. The size of the light sensing transistor can be designed according to actual needs, for example, with a width-to-length ratio W / L of 20:4, but not limited thereto.

[0062] Exemplarily, the control electrode includes a gate, the input electrode includes a source, and the output electrode includes a drain.

[0063] Exemplarily, the detection chip 20 includes a control chip (i.e., TDDIIC) integrating display and touch control, and the first signal transmission line 31 and the second signal transmission line 32 are connected to the CGOUT pin of the TDDIIC. For example, the TDDIIC provides a GND signal for the first signal transmission line 31 and a VGH power supply signal for the second signal transmission line 32, but is not limited to this.

[0064] When the light sensing unit of the above structure is irradiated by the external ambient light, a drain current will be generated. The sensing signal transmission line 30 connects the drains of the light sensing transistors in the light sensing unit together and is connected to the detection chip 20. The detection chip 20 will detect the voltage of the sensing signal transmission line 30, that is, Figure 3The voltage at point D in the middle (i.e., the voltage at the drain end). When the intensity of the external ambient light is greater, the leakage current generated by the light-sensing unit is greater, that is, the voltage detected at the drain end is greater, so the external ambient light intensity can be judged by the voltage at the drain end. In more detail, the display module needs to burn the relationship curve between the external light intensity and the voltage at the drain end into the detection chip 20 through an algorithm in advance, so that when the user actually uses it, the detection chip 20 detects the voltage at the drain end, and the external ambient light intensity at this time can be calculated through the burned relationship between the external light intensity and the voltage at the drain end, and provided to the mainboard end of the display product, thereby controlling the backlight brightness of the display module, and achieving the brightness of the display module controlled according to the ambient light intensity.

[0065] It is worth noting that by coupling the sensing signal transmission line 30 to one end of the resistor structure R1 and connecting the other end of the resistor structure R1 to the GND signal input terminal, the voltage of the sensing signal transmission line 30 can be obtained as the drain current multiplied by the resistance value of the resistor structure R1.

[0066] Exemplarily, the display module includes a liquid crystal display module, in which a light-sensing function is integrated to realize a light-sensitive LCD screen. This light-sensitive LCD screen can replace the conventional silicon-based sensor currently used in the whole machine (the conventional silicon-based sensor of the whole machine detects the intensity of the external ambient light to adjust the display brightness of the mobile phone). Compared with the design, materials, and assembly of conventional silicon-based sensors, it can save a certain amount of cost, thereby greatly improving the competitiveness of the light-sensitive LCD screen.

[0067] According to the specific structure of the above-mentioned display module, in the display module provided by the embodiment of the present utility model, the orthographic projection of the common electrode layer 40 on the base substrate of the array substrate does not overlap with the orthographic projection of the photosensitive module 10 on the base substrate, and does not overlap with the orthographic projection of the sensing signal transmission line 30 on the base substrate; the orthographic projection of the common electrode layer 40 on the base substrate of the array substrate does not overlap with the orthographic projection of the first signal transmission line 31 on the base substrate; the orthographic projection of the common electrode layer 40 on the base substrate of the array substrate does not overlap with the orthographic projection of the second signal transmission line 32 on the base substrate.

[0068] The above arrangement realizes the removal of the common electrode layer 40 in the overlapping area directly above the light sensing module 10, the light sensing signal transmission line, the first signal transmission line 31 and the second signal transmission line 32, so that the voltage at the drain end (i.e., the sensing signal) will not be affected by the voltage fluctuation of the common electrode layer 40. Figure 6, the drain voltage of the photosensitive transistor has no coupled mutations; when the same display module displays different images, the voltage value of the sensing signal remains unchanged. That is, the ambient light intensity calculated by the detection chip 20 of the same display module is not affected by the type of displayed image, but only by the ambient light. This effectively improves the accuracy of the display module's recognition of ambient light intensity. Tests have shown that this accuracy can be increased to 15%. This detection of light intensity can effectively improve the display quality of display products.

[0069] It should be noted that the signals of the first signal transmission line 31 and the second signal transmission line 32 can be provided by the detection chip 20 or by other signal input terminals.

[0070] like Figure 3 As shown, in some embodiments, the array substrate further includes: a flexible circuit board FPC, the flexible circuit board FPC is arranged on the base substrate, the flexible circuit board FPC includes a first signal input terminal V1 and a second signal input terminal V2, the first signal input terminal V1 is coupled to the first signal transmission line 31, and the second signal input terminal V2 is coupled to the second signal transmission line 32.

[0071] It should be noted that Figure 3 The figure also shows the binding pin Pin 2 in the flexible circuit board FPC; Figure 3 Also shown are the frame of the display panel (ie, the panel frame), the single-layer area of ​​the display panel (ie, the panel single-layer area, which is the area with only the array substrate), the connector, and the GND trace 70.

[0072] Exemplarily, the flexible circuit board FPC is bound to the base substrate located in the lower frame area, and the flexible circuit board FPC includes a signal generating circuit coupled to the first signal input terminal V1 and the second signal input terminal V2.

[0073] Exemplarily, the first signal inputted by the first signal input terminal V1 and the second signal inputted by the second signal input terminal V2 include a power supply signal.

[0074] The gate of each photosensitive transistor in the photosensitive unit receives a first signal through the first signal transmission line 31, the source of each photosensitive transistor in the photosensitive unit receives a second signal through the second signal transmission line 32, and the drain of each photosensitive transistor in the photosensitive unit is connected to the detection chip 20 through the sensing signal transmission line 30; when the photosensitive unit is irradiated by external ambient light, it generates a drain current and transmits it to the sensing signal transmission line 30, the detection chip 20 detects the voltage of the sensing signal transmission line 30, and obtains the ambient light intensity based on the voltage.

[0075] Currently, when the signals received by the first signal transmission line 31 and the second signal transmission line 32 are provided by the CGOUTpin of the TDDIIC, there are only three gears (0v, VSP (VSN), VGH (VGL)) to choose from, and each has its own problems and cannot meet the test requirements.

[0076] More specifically, due to its internal material design, the detection chip 20 has requirements for the voltage at point D. This requires the voltage at point D to be greater than 0.5V to detect the voltage. The current solution sets the voltage of the first signal received by the gate of the photosensitive transistor to 0V. In the presence of coupling to the common electrode layer 40 (for example, the voltage of the common electrode layer 40 in the a-si display module is currently around -2.5V, and testing has shown that this photosensitive electrode layer can provide a coupling voltage of approximately 1.5V to point D), when the ambient light intensity is 400 lux, the detection chip 20 detects a voltage at point D between 1.7V and 1.8V.

[0077] Without the added coupling of common electrode layer 40, the voltage at point D would be between 0.2V and 0.3V at an ambient light intensity of 400 lux, and detection chip 20 would be unable to detect the voltage at point D. It is worth noting that the maximum resistance value that can be set for resistor structure R1 coupled to sensing signal transmission line 30 is 100MΩ, which is the maximum resistance value currently customizable for mobile projects. If multiple 100MΩ resistors were connected in series, the resistors would occupy too much layout space on the flexible circuit board (FPC), which would not meet practical requirements. Therefore, setting a larger resistance value for R1 would not be able to increase the voltage at point D.

[0078] If the voltage value of the first signal received by the gate of the phototransistor is set to VSP, even without coupling from the common electrode layer 40, since the phototransistor is in the on state, if the source terminal is set to VSP or VGH, the current at the drain terminal of the phototransistor will be very large when the ambient light is 400 lux, and the voltage at point D will be above 20V, exceeding the maximum detectable voltage of 5V of the detection chip 20. If the resistance value of R1 is reduced to lower the voltage at point D, for example, by reducing the resistance of R1 from 100MΩ to 10Ω, the voltage at point D will be above 6V when the ambient light is 10,000 lux and without coupling from the common electrode layer 40, due to the large current at the drain terminal of the phototransistor, the voltage will still exceed the maximum detectable voltage of 5V of the detection chip 20.

[0079] Therefore, the signals received by the first signal transmission line 31 and the second signal transmission line 32 have their own problems when provided by the CGOUT pin of the TDDI IC and cannot meet the test requirements.

[0080] like Figure 3 and Figure 10As shown, in some embodiments, the flexible circuit board FPC also includes: a first signal adjustment circuit, which is respectively coupled to the first signal input terminal V1, the first signal transmission line 31 and the ground signal input terminal, and is used to adjust the voltage value of the first signal received by the first signal transmission line 31.

[0081] Exemplarily, the first signal conditioning circuit includes a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is coupled to the ground signal input end, the second end of the fourth resistor R4 is coupled to the first signal transmission line 31, the first end of the fifth resistor R5 is coupled to the first signal transmission line 31, and the second end of the fifth resistor R5 is coupled to the first signal input end V1.

[0082] like Figure 3 and Figure 10 As shown, in some embodiments, the flexible circuit board FPC also includes: a second signal adjustment circuit, which is respectively coupled to the second signal input terminal V2, the second signal transmission line 32 and the ground signal input terminal, and is used to adjust the voltage value of the second signal received by the second signal transmission line 32.

[0083] Exemplarily, the second signal conditioning circuit includes a second resistor R2 and a third resistor R3, the first end of the second resistor R2 is coupled to the ground signal input end, the second end of the second resistor R2 is coupled to the second signal transmission line 32, the first end of the third resistor R3 is coupled to the second signal transmission line 32, and the second end of the third resistor R3 is coupled to the second signal input end V2.

[0084] The specific working principle is as follows: when the gate and source of the phototransistor receive signals provided by the flexible circuit board (FPC), the corresponding CGOUT pin in the detection chip 20 can be set to Hiz non-output mode. At this time, the gate voltage of the phototransistor is: V(gate) = VGH*R4 / (R4+R5), where R4 represents the resistance value of the fourth resistor and R5 represents the resistance value of the fifth resistor; the source voltage of the phototransistor is: V(source) = IOVCC*R2 / (R2+R3), where R2 represents the resistance value of the second resistor and R3 represents the resistance value of the third resistor; VGH is the voltage value of the signal provided by the first signal input terminal V1; IOVCC is the voltage value of the signal provided by the second signal input terminal V2.

[0085] By changing the resistors R2, R3, R4, and R5, the gate and source input voltages of the photosensitive transistor can be set arbitrarily, with the selectable voltage range being anywhere between 0V and the power supply signal voltage (e.g., VGH = 16V). This avoids the disadvantage of having only three selectable voltages. This allows the gate and source voltages of the photosensitive transistor to be set to any desired voltage based on actual needs, ensuring that the detection chip 20 can effectively detect the drain voltage within a typical ambient light intensity range. This enhances the competitiveness of the display module's light-sensing function and ensures the commercialization and mass production feasibility of light-sensing technology.

[0086] In the display module provided by the above embodiment, the gate and source of the photosensitive transistor can not only be connected to the CGOUT pin of the detection chip 20, but can also be led out to the flexible circuit board FPC. By setting a series resistor on the flexible circuit board FPC, the voltage of the signal received by the gate and source of the photosensitive transistor can be adjusted by changing the resistance value, ensuring that the detection chip 20 can effectively detect the drain voltage within the normal ambient light intensity range.

[0087] In the display module provided by the above embodiment, when a flexible circuit board FPC is used to provide signals for the gate and source of the photosensitive transistor, the gate and source of the photosensitive transistor can receive any required voltage according to actual needs, which can better match and eliminate the disadvantages caused by the coupling generated by the common electrode layer 40.

[0088] like Figure 7 As shown, in some embodiments, the display module includes a display area AA and a peripheral area located around the display area AA; the common electrode layer 40 includes a first common electrode layer 401 and a second common electrode layer 402, at least a portion of the first common electrode layer 401 is located in the display area AA, and the second common electrode layer 402 is located in the peripheral area; the orthographic projection of the photosensitive module 10 on the base substrate is located between the orthographic projection of the first common electrode layer 401 on the base substrate and the orthographic projection of the second common electrode layer 402 on the base substrate.

[0089] Exemplarily, the first common electrode layer 401 includes a first common electrode portion and a second common electrode portion 401a, the first common electrode portion is located in the display area AA, the second common electrode portion 401a is located in the peripheral area, the first common electrode portion is coupled to the second common electrode portion 401a, and the second common electrode portion 401a is located between the first common electrode portion and the second common electrode layer 402.

[0090] Exemplarily, the second common electrode layer 402 is coupled to the first common electrode layer 401 and receives a common electrode signal provided by the first common electrode layer 401 .

[0091] Exemplarily, the common electrode layer 40 originally located between the second common electrode layer 402 and the second common electrode portion 401 a is removed, so that the common electrode layer 40 cannot generate coupling effects on the photosensitive module 10 and the signal transmission line.

[0092] Exemplarily, a first distance d1 is defined between the first common electrode layer 401 and the second common electrode layer 402 (e.g., the second common electrode portion 401a), where d1 satisfies the following: d1 > 136 μm. For example, d1 may take values ​​such as, but not limited to, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, and 170 μm. It is worth noting that d1 must be greater than the overall width of the light sensing module 10.

[0093] Exemplarily, the second common electrode layer 402 has a first width d2 perpendicular to its own extension direction, and d2 satisfies: d2>10μm. For example, d2 can be 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, etc., but is not limited thereto.

[0094] Exemplarily, there is a second distance d3 between the orthographic projection of the second common electrode layer 402 on the substrate and the orthographic projection of the sensing signal transmission line 30 on the substrate, and d3 satisfies: d3>2μm; for example: d3 can take values: 3μm, 4μm, 5μm, etc., but is not limited to this.

[0095] Exemplarily, there is a third distance d4 between the second common electrode layer 402 away from the boundary of the display area AA and the second common electrode part 401a close to the boundary of the display area AA, and d4 satisfies: 160μm≤d4≤250μm; for example: d4 can take values: 180μm, 210μm, 240μm, etc., but is not limited to this.

[0096] like Figure 5 As shown, in some embodiments, the array substrate further includes a light-shielding layer 60, which is located between the photosensitive module 10 and the base substrate, and the orthographic projection of the photosensitive module 10 on the base substrate is located inside the orthographic projection of the light-shielding layer 60 on the base substrate.

[0097] For example, the light shielding layer 60 may be made of a gate metal material, which can reduce the influence of backlight on the photosensitive transistor.

[0098] Exemplarily, the light shielding layer 60 may be reused as the gate of the photosensitive transistor, but is not limited thereto.

[0099] Illustratively, along a direction away from the base substrate, the light shielding layer 60 , the photosensitive module 10 , and the photosensitive electrode layer are stacked in sequence.

[0100] like Figure 5 、 Figure 8 and Figure 9 As shown, in some embodiments, the light sensing module 10 includes a first light sensing unit 101 and at least one second light sensing unit (a first second light sensing unit 102a, a second second light sensing unit 102b, and a third second light sensing unit 102c); the display module further includes a color filter substrate 85, the color filter substrate 85 including at least one color filter pattern CF (which may include: a red color filter pattern CFR, a green color filter pattern CFG, and a blue color filter pattern CFB) and a black matrix layer BM; the color filter substrate is disposed opposite to the array substrate 87, and the color filter pattern CF and the black matrix layer BM are close to the array substrate 87;

[0101] The orthographic projection of the color film pattern on the base substrate at least partially overlaps with the orthographic projection of the corresponding second photosensitive unit on the base substrate; the orthographic projection of the black matrix layer BM on the base substrate does not overlap with the orthographic projection of the second photosensitive unit on the base substrate, and the orthographic projection of the black matrix layer BM on the base substrate covers the orthographic projection of the first photosensitive unit on the base substrate.

[0102] It should be noted that Figure 8 Also illustrated are the frame sealing glue 80, the backlight assembly 81 (which may specifically include an upper prism, a lower prism, a diffuser, a light guide plate, a reflective sheet and adhesive iron, etc.), the backlight black shading glue 82, the cover body black ink 83, the cover CG, the upper polarizer 84, the liquid crystal 86, and the lower polarizer 88.

[0103] Exemplarily, the photosensitive module 10 includes three second photosensitive units; the color filter substrate includes a red color filter pattern CFR, a green color filter pattern CFG and a blue color filter pattern CFB, the orthographic projection of the red color filter pattern CFR on the base substrate at least partially overlaps with the orthographic projection of the first second photosensitive unit 102a on the base substrate, the orthographic projection of the green color filter pattern CFG on the base substrate at least partially overlaps with the orthographic projection of the second second photosensitive unit 102b on the base substrate, and the orthographic projection of the blue color filter pattern CFB on the base substrate at least partially overlaps with the orthographic projection of the third second photosensitive unit 102c on the base substrate.

[0104] Exemplarily, the first of the second light-sensing units and the third of the second light-sensing units are used to determine the type of the external ambient light source (such as sunlight, LED light, fluorescence, etc.), the first light-sensing unit is used to determine how much leakage the backlight causes to the photosensitive transistor, and the second of the second light-sensing units is used to determine the intensity of the external ambient light based on the determination results of the above three light-sensing units, so that the type and intensity of the external ambient light source can be detected.

[0105] An embodiment of the present invention further provides a display device, comprising the display module provided by the above embodiment.

[0106] It should be noted that the display device can be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device also includes a flexible circuit board FPC, a printed circuit board and a backplane, etc.

[0107] In the display module provided by the above embodiment, the common electrode layer 40 in the overlapping area directly above the light-sensing module 10, the light-sensing signal transmission line, the first signal transmission line 31, and the second signal transmission line 32 is removed. In this way, the voltage at the drain end (i.e., the sensing signal) detected will not be affected by the voltage fluctuation of the common electrode layer 40. When the same display module displays different pictures, the voltage value of the sensing signal remains unchanged, that is, the external ambient light intensity calculated by the detection chip 20 of the same display module is not affected by the type of display picture, but only by the external ambient light, thereby effectively improving the accuracy of the display module in identifying the external ambient light intensity. The display device provided by the embodiment of the present utility model also has the above-mentioned beneficial effects when including the above-mentioned display module, which will not be repeated here.

[0108] It should be noted that the signal line extends along a certain direction means that: the signal line includes a main part and a secondary part connected to the main part, the main part is a line, a line segment or a strip-shaped body, the main part extends along a certain direction, and the length of the main part extended along the certain direction is greater than the length of the secondary part extended along other directions.

[0109] It should be noted that the "same layer" in the embodiments of the present invention may refer to film layers on the same structural layer. Or, for example, film layers on the same layer may be film layers that are formed using the same film-forming process to form specific patterns, and then patterned using the same mask through a single patterning process to form the film layers. Depending on the specific pattern, a single patterning process may include multiple exposure, development, or etching processes, and the specific patterns in the resulting layer structure may be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

[0110] In the various method embodiments of the present invention, the serial numbers of the steps cannot be used to limit the order of the steps. For ordinary technicians in this field, without paying any creative work, changes to the order of the steps are also within the scope of protection of the present invention.

[0111] It should be noted that the various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences from other embodiments. In particular, the method embodiments are described briefly because they are generally similar to the product embodiments. For relevant parts, refer to the description of the product embodiments.

[0112] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect", "couple" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0113] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0114] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0115] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A display module, characterized in that: The array substrate includes: A light sensing module, which is used to sense the intensity of ambient light and generate a sensing signal; a detection chip and a sensing signal transmission line, wherein the sensing signal transmission line is coupled to the light sensing module and the detection chip respectively, the sensing signal transmission line is used to transmit the sensing signal to the detection chip, and the detection chip is used to determine the external ambient light intensity according to the sensing signal; A common electrode layer, wherein the orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the light sensing module on the base substrate, and does not overlap with the orthographic projection of the sensing signal transmission line on the base substrate.

2. The display module according to claim 1, wherein: The light sensing module includes at least two groups of light sensing units, and the light sensing units include a plurality of light sensing transistors connected in parallel; The array substrate includes at least two sensing signal transmission lines, and the sensing signal transmission lines are coupled to output electrodes of the photosensitive transistors included in a corresponding group of photosensitive units; The array substrate further includes a first signal transmission line and a second signal transmission line; the first signal transmission line is respectively coupled to the control electrode of each photosensitive transistor included in each group of photosensitive units; the second signal transmission line is respectively coupled to the input electrode of each photosensitive transistor included in each group of photosensitive units; The detection chip is coupled to the first signal transmission line and the second signal transmission line respectively; The orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the first signal transmission line on the base substrate; and / or, the orthographic projection of the common electrode layer on the base substrate of the array substrate does not overlap with the orthographic projection of the second signal transmission line on the base substrate.

3. The display module according to claim 2, wherein: The array substrate further includes: A flexible circuit board is provided on the base substrate, and includes a first signal input terminal and a second signal input terminal, wherein the first signal input terminal is coupled to the first signal transmission line, and the second signal input terminal is coupled to the second signal transmission line.

4. The display module according to claim 3, wherein: The flexible circuit board also includes: A first signal regulating circuit is coupled to the first signal input terminal, the first signal transmission line and the ground signal input terminal respectively, and is used to regulate the voltage value of the first signal received by the first signal transmission line.

5. The display module according to claim 4, wherein: The first signal conditioning circuit includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is coupled to the ground signal input terminal, the second end of the fourth resistor is coupled to the first signal transmission line, the first end of the fifth resistor is coupled to the first signal transmission line, and the second end of the fifth resistor is coupled to the first signal input terminal.

6. The display module according to claim 3, wherein: The flexible circuit board also includes: The second signal regulating circuit is respectively coupled to the second signal input terminal, the second signal transmission line and the ground signal input terminal, and is used to regulate the voltage value of the second signal received by the second signal transmission line.

7. The display module according to claim 6, wherein: The second signal conditioning circuit includes a second resistor and a third resistor, the first end of the second resistor is coupled to the ground signal input terminal, the second end of the second resistor is coupled to the second signal transmission line, the first end of the third resistor is coupled to the second signal transmission line, and the second end of the third resistor is coupled to the second signal input terminal.

8. The display module according to any one of claims 1 to 7, wherein: The display module includes a display area and a peripheral area located around the display area; The common electrode layer includes a first common electrode layer and a second common electrode layer, at least a portion of the first common electrode layer is located in the display area, and the second common electrode layer is located in the peripheral area; The orthographic projection of the photosensitive module on the base substrate is located between the orthographic projection of the first common electrode layer on the base substrate and the orthographic projection of the second common electrode layer on the base substrate.

9. The display module according to claim 8, wherein: A first distance d1 is provided between the first common electrode layer and the second common electrode layer, and d1 satisfies: d1>136 μm; The second common electrode layer has a first width d2 perpendicular to its own extension direction, and d2 satisfies: d2>10μm; A second distance d3 is formed between the orthographic projection of the second common electrode layer on the base substrate and the orthographic projection of the sensing signal transmission line on the base substrate, and d3 satisfies: d3>2 μm.

10. The display module according to any one of claims 1 to 7, wherein: The array substrate further includes a light shielding layer, which is located between the light sensing module and the base substrate. The orthographic projection of the light sensing module on the base substrate is located inside the orthographic projection of the light shielding layer on the base substrate.

11. The display module according to any one of claims 2 to 7, wherein: The light sensing module includes a first light sensing unit and at least one second light sensing unit; The display module further includes a color filter substrate, which includes at least one color filter pattern and a black matrix layer; the color filter substrate is arranged opposite to the array substrate, and the color filter pattern and the black matrix layer are close to the array substrate; The orthographic projection of the color filter pattern on the base substrate at least partially overlaps with the orthographic projection of the corresponding second light-sensing unit on the base substrate; The orthographic projection of the black matrix layer on the base substrate does not overlap with the orthographic projection of the second photosensitive unit on the base substrate, and the orthographic projection of the black matrix layer on the base substrate covers the orthographic projection of the first photosensitive unit on the base substrate.

12. The display module according to claim 11, wherein: The photosensitive module includes three second photosensitive units; the color filter substrate includes a red color filter pattern, a green color filter pattern and a blue color filter pattern, the orthographic projection of the red color filter pattern on the base substrate at least partially overlaps with the orthographic projection of the first second photosensitive unit on the base substrate, the orthographic projection of the green color filter pattern on the base substrate at least partially overlaps with the orthographic projection of the second second photosensitive unit on the base substrate, and the orthographic projection of the blue color filter pattern on the base substrate at least partially overlaps with the orthographic projection of the third second photosensitive unit on the base substrate.

13. A display device, characterized in that: The invention comprises the display module according to any one of claims 1 to 12.

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