Display module, display device, ambient light detection method and storage medium

Abstract

This disclosure provides a display module, a display device, an ambient light detection method, and a storage medium. The display module includes a cover plate, a display panel, and a backlight module arranged sequentially along a first direction. The display panel integrates a detection light sensor group, a first correction light sensor group, and a second correction light sensor group. Each of the detection light sensor group, the first correction light sensor group, and the second correction light sensor group includes at least one photosensitive transistor. The light-emitting side of the display module is a light-transmitting area at the position corresponding to the detection light sensor group and a light-shielding area at the position corresponding to the first correction light sensor group and the second correction light sensor group. The backlight side of the display module is a light-transmitting area at the position corresponding to the detection light sensor group and the first correction light sensor group and a light-shielding area at the position corresponding to the second correction light sensor group.

Description

Technical Field

[0001] This disclosure relates to the field of display technology. More specifically, it relates to a display module, a display device, an ambient light detection method, and a storage medium. Background Technology

[0002] In related technologies, display panels supporting light sensing integrate phototransistors. These phototransistors, such as thin-film transistors (TFTs), detect the intensity of ambient light and adjust the display brightness accordingly. When ambient light shines on the phototransistor, it generates a current when turned on. The greater the light intensity, the greater the current, thus the intensity of the ambient light can be determined based on the current magnitude.

[0003] However, when existing phototransistors are working, their ambient light detection results are affected by factors such as temperature and backlight, resulting in low accuracy. Summary of the Invention

[0004] The purpose of this disclosure is to provide a display module, display device, ambient light detection method, and storage medium to solve the technical problem of low accuracy of ambient light detection results in related technologies.

[0005] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0006] The first aspect of this disclosure provides a display module, including a cover plate, a display panel, and a backlight module arranged sequentially along a first direction. The display panel integrates a photosensitive group, a first correction photosensitive group, and a second correction photosensitive group. Each of the photosensitive group, the first correction photosensitive group, and the second correction photosensitive group includes at least one photosensitive transistor. The light-emitting side of the display panel is a light-transmitting area at the position corresponding to the photosensitive group and a light-shielding area at the position corresponding to the first correction photosensitive group and the second correction photosensitive group. The backlight side of the display panel is a light-transmitting area at the position corresponding to the photosensitive group and the first correction photosensitive group and a light-shielding area at the position corresponding to the second correction photosensitive group.

[0007] Optionally, the display panel includes a display area and a border area surrounding the display area; the cover plate includes a first light-transmitting area and a first light-shielding area surrounding the first light-transmitting area; the backlight module includes a second light-transmitting area and a second light-shielding area surrounding the second light-transmitting area; the orthographic projection of the display area in a first plane is a first projection; the orthographic projection of the first light-transmitting area in the first plane is a second projection; the orthographic projection of the second light-transmitting area in the first plane is a third projection; the second projection covers and is larger than the first projection; the third projection covers the second projection; the display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked along the first direction. The substrate has the detection light sensor group, the first correction light sensor group, and the second correction light sensor group integrated on it. The orthographic projections of the detection light sensor group and the first correction light sensor group in the first plane are located in the projection area of ​​the second projection that exceeds the first projection. The orthographic projections of the first light-blocking area and the second light-blocking area in the first plane cover the orthographic projection of the second correction light sensor group in the first plane. The first substrate has a color filter layer at the position corresponding to the detection light sensor group and a first black matrix layer at the positions corresponding to the first correction light sensor group and the second correction light sensor group. The first plane is a plane parallel to the display panel.

[0008] Optionally, the detection light sensor group includes at least a first color detection light sensor group, a second color detection light sensor group, and a third color detection light sensor group, and the color filter layer includes a first color filter layer, a second color filter layer, and a third color filter layer. The first substrate has a first color filter layer disposed at a position corresponding to the first color detection light sensor group, a second color filter layer disposed at a position corresponding to the second color detection light sensor group, and a third color filter layer disposed at a position corresponding to the third color detection light sensor group.

[0009] Optionally, the first substrate is further provided with a first color filter layer, a second color filter layer and a third color filter layer stacked along the first direction at a position corresponding to the first correction photosensitive group. The first color filter layer is disposed in the same layer as the first color filter layer, the second color filter layer is disposed in the same layer as the second color filter layer, and the third color filter layer is disposed in the same layer as the third color filter layer.

[0010] Optionally, the first substrate is further provided with a second black matrix layer at a position corresponding to the first correction photosensitive group, and the second black matrix layer and the first black matrix are stacked together along the first direction.

[0011] Optionally, the border area includes a bound area and an unbound area located on opposite sides of the second direction of the display area. The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are all disposed on the same side as the unbound area. The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at intervals along a third direction. The second direction and the third direction are parallel to the first plane, and the third direction is perpendicular to the second direction.

[0012] Optionally, the first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at equal intervals in the third direction.

[0013] Optionally, the first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group each include multiple light-sensing transistors. Each light-sensing transistor includes a control terminal, a first terminal, and a second terminal. The control terminal is configured to be grounded, the first terminal is configured to be connected to a first voltage source, and the second terminal is a sensing result output terminal.

[0014] Optionally, the cover plate includes a transparent cover plate body and an ink layer disposed on the edge of the transparent cover plate body. The area of ​​the transparent cover plate body without the ink layer forms the first light-transmitting area, and the area of ​​the transparent cover plate body with the ink layer forms the first light-shielding area.

[0015] Optionally, the backlight module includes a frame and a light-shielding tape. The light-shielding tape is disposed on the side of the frame facing the display panel. The area of ​​the backlight module not blocked by the light-shielding tape forms the second light-transmitting area, and the area of ​​the backlight module where the light-shielding tape is disposed forms the second light-shielding area.

[0016] Optionally, the distance S between the photosensitive transistor in the second correction light-sensing group and the display area in the second direction is: S = max(s1,s2) + a, where max(s1,s2) represents the maximum value of s1 and s2, a is a constant, s1 represents the critical distance in the second direction between the photosensitive transistor and the inner boundary line of the first light-shielding area when the ambient light is blocked by the first light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group, and s2 represents the critical distance in the second direction between the photosensitive transistor and the inner boundary line of the second light-shielding area when the backlight is blocked by the second light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group.

[0017] Optionally, the display panel further includes a first polarizer disposed between the first substrate and the cover plate, and a second polarizer disposed between the second substrate and the backlight module. The display module further includes an optical adhesive layer disposed between the cover plate and the first polarizer, wherein:

[0018] s1=T1 / tan(90°-β2) and n1*sinβ1=n2*sinβ2 (β1≥90°)

[0019] s² = T² / tanα (α ≤ 45°)

[0020] Where T1 represents the sum of the thicknesses of the first polarizer, the optical adhesive layer, and the first substrate; n1 represents the air refractive index; n2 represents the refractive index of the cover plate; β1 represents the incident angle of ambient light entering the cover plate; β2 represents the refraction angle of ambient light in the cover plate; T2 represents the sum of the thicknesses of the second polarizer and the second substrate; and α represents the incident angle of backlight on the second polarizer.

[0021] A second aspect of this disclosure provides a display device including the display module described above.

[0022] A third aspect of this disclosure provides an ambient light detection method applicable to the display module described above, the ambient light detection method comprising:

[0023] Acquire a first sensing result output by the detection light sensor group, a second sensing result output by the first correction light sensor group, and a third sensing result output by the second correction light sensor group, wherein the third sensing result is a temperature influence value;

[0024] Calculate the backlight impact value based on the second sensing result and the third sensing result;

[0025] The ambient light detection result is obtained by correcting the first sensing result based on the backlight influence value and the temperature influence value.

[0026] The fourth aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the ambient light detection method described above.

[0027] The beneficial effects of this disclosure are as follows:

[0028] The display module of this embodiment adds a second correction light sensor group and sets both the light-emitting side and the backlight side of the display module to be light-shielding areas at the location of the second correction light sensor group. This ensures that the detection results of the second correction light sensor group are only affected by temperature. Simultaneously, setting the light-emitting side of the display module to be a light-shielding area at the location of the first correction light sensor group and the backlight side to be a light-transmitting area at the location of the first correction light sensor group ensures that the detection results of the first correction light sensor group are only affected by backlight and temperature. Processing the detection results of the first and second correction light sensors yields an influence value that is only related to backlight. This configuration allows for real-time temperature compensation of the detection results of the detection light sensor group using the detection results of the second correction light sensor group. Furthermore, it allows for the calculation of a real-time backlight influence value using the detection results of the first and second correction light sensor groups, which can then be used to perform real-time backlight compensation of the detection results of the detection light sensor group. In other words, this disclosure allows for real-time backlight correction and real-time temperature correction of the detection results of the detection light sensor group, yielding detection results that are only related to ambient light intensity, thus improving the accuracy of ambient light detection results. Attached Figure Description

[0029] The specific embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the planar structure of a display module in related technologies;

[0031] Figure 2 for Figure 1 The middle part displays a side view of the module along the B-B' direction;

[0032] Figure 3 for Figure 1 The middle section displays a side view of the module along the C-C' direction;

[0033] Figure 4 for Figure 1 A front view of a local region Q1 in the middle;

[0034] Figure 5 The curve showing the relationship between leakage current and backlight intensity of the black group D photosensitive transistor in related technologies;

[0035] Figure 6 The curve showing the relationship between leakage current and ambient light intensity of the black group D photosensitive transistor in related technologies;

[0036] Figure 7 The curve showing the relationship between leakage current and ambient temperature for the black group D photosensitive transistor in related technologies;

[0037] Figure 8 A partial planar schematic diagram of a display module is provided for embodiments of this disclosure;

[0038] Figure 9 To display module along Figure 8 Side view along the middle section line D-D' direction;

[0039] Figure 10 To display module along Figure 8 Side view along the middle section line E-E' direction;

[0040] Figure 11 for Figure 9 A magnified view of a portion of region Q2 in the middle area;

[0041] Figure 12 This is a schematic diagram showing the visible light transmission bands of the color filter layers R-CF2, G-CF2, and B-CF2 as measured in actual measurements.

[0042] Figure 13 This is a schematic diagram of another embodiment of the display module;

[0043] Figure 14 This is a schematic diagram of the film structure of any phototransistor;

[0044] Figure 15 This is a schematic diagram of the circuit structure of each photosensitive transistor in the display module according to an embodiment of the present disclosure;

[0045] Figure 16 A schematic diagram of the optical path from ambient light incident on the second correction photosensitive group D2;

[0046] Figure 17 The curve showing the relationship between leakage current and ambient light for the second calibration photosensitive group D2 at a fixed temperature;

[0047] Figure 18 This is a schematic diagram of the optical path from the backlight incident on the second correction photosensitive group D2;

[0048] Figure 19 This is a schematic diagram of the light intensity distribution of the backlight across various viewing angles.

[0049] Figure 20 The curve showing the relationship between the leakage current of the photosensitive transistor and the backlight in the second calibration photosensitive group D2;

[0050] Figure 21 This is a structural diagram showing the size design of the photosensitive transistor in the photosensitive assembly provided in this embodiment of the disclosure;

[0051] Figure 22 A flowchart of an ambient light detection method provided in an embodiment of this disclosure. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0053] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0054] In related technologies, display modules that support light sensing functions, such as... Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of the planar structure of the display module. Figure 2 for Figure 1 The middle section displays a side view of the module along the B-B' direction. Figure 3 for Figure 1 The middle section displays a side view of the module along the C-C' direction. Figure 4 for Figure 1 A front view of a local region Q1, as shown below. Figures 1 to 4As shown, the display module includes, from top to bottom, a glass cover (CG) 610, an optically clear adhesive (OCA) layer 620, an upper polarizer (POL) 630, a color filter substrate 640, a liquid crystal layer 650, an array substrate 660, a lower polarizer 670, and a backlight unit (BLU) 680. A black ink layer 610a is provided in the periphery area of ​​the glass cover 610, a light-shielding adhesive 680a is provided in the periphery area of ​​the backlight unit 680, and a black matrix layer BM is covered in the bezel area of ​​the color filter substrate 640. The light-sensing function is located within the upper bezel area of ​​the display module. Specifically, four groups of photosensitive transistors (TFTs) are located within this area, designated as red (R), green (G), blue (B), and black (D). Red group R indicates that the black matrix layer BM above the photosensitive transistor has been removed and filled with a red color film R-CF; green group G indicates that the black matrix layer BM above the photosensitive transistor has been removed and filled with a green color film G-CF; blue group B indicates that the black matrix layer BM above the photosensitive transistor has been removed and filled with a blue color film B-CF; and black group D indicates that the black matrix layer BM above the photosensitive transistor has not been removed. In the Y-direction of the display module, these four groups of photosensitive transistors are located between the AA boundary line and the CG-VA boundary line. The AA boundary line represents the outer boundary line of the display area of ​​the display panel, while CG-VA represents the outer boundary line of the light-transmitting area on the glass cover, which can also be understood as the inner boundary line of the light-shielding area, i.e., the inner boundary line of the ink layer. This ensures that the ink layer on the glass cover does not block the photosensitive transistors from receiving ambient light.

[0055] During ambient light detection, ambient light shines on the three photosensitive groups R, G, and B. The photosensitive transistor in the red group R receives the red light from this light source, and similarly, the photosensitive transistors in the green group G and the blue group B receive the green and blue light from this light source, respectively. Since any photosensitive transistor is in the off state (i.e., the gate is not energized) and a certain voltage is supplied to its source, its drain will generate a certain leakage current I. d By measuring the leakage current I d This allows us to obtain the intensity of ambient light. However, although the leakage current I of the phototransistor can be measured... dHowever, it is necessary to pre-calibrate the relationship between ambient light intensity and leakage current in order to determine the ambient light intensity through leakage current. Specifically, leakage current values ​​at different light intensities under a certain light source need to be collected in advance to generate a curve showing the relationship between light intensity and leakage current under different intensities of this light source. However, in actual use, there are many types of ambient light, and the proportions of red, green, and blue light are different for different types of ambient light. That is, the proportions of each color of light in the current ambient light and the light source corresponding to the pre-generated relationship curve are different. Therefore, it is also necessary to correct the current ambient light to match the light source of the pre-generated light intensity and leakage current relationship curve.

[0056] The light source correction algorithm includes, but is not limited to, the following:

[0057] Step (1.1) Pre-collect the leakage current values ​​corresponding to different light intensities under a certain light source (let’s call it light source L1) and generate the relationship curve between the light intensity and leakage current of this light source.

[0058] Step (1.2) Pre-collect the leakage current values ​​of the red group R photosensitive transistor and the blue group B photosensitive transistor for different light sources. In this way, the type of light source of the current ambient light can be determined by collecting the leakage current of the red group R photosensitive transistor and the blue group B photosensitive transistor.

[0059] Step (1.3) pre-collects the leakage current values ​​of the green group G photosensitive transistors of different light sources. In this way, the light source (i.e., light source L1) used in the different light sources and the pre-generated relationship curve can generate a light intensity coefficient for different light sources.

[0060] The values ​​collected in advance through steps (1) to (3) above can be used to correct the current ambient light to the light source corresponding to the pre-collected relationship curve, thereby enabling the photosensitive transistor to detect the light intensity of the actual ambient light.

[0061] However, the inventors discovered that the aforementioned pre-collection process was performed at a fixed ambient temperature, while in reality, the leakage current I of the photosensitive transistors in the red group R, green group G, and blue group B... d Besides being affected by ambient light, photosensitive transistors are also affected by backlighting and ambient temperature. Therefore, it is necessary to eliminate the influence of ambient temperature and backlighting on the photosensitive transistors, leaving only the influence of ambient light intensity to accurately reflect the intensity of external ambient light. To this end, a black group D was designed. The function of the black group D is to use the black matrix layer BM to block external ambient light, preventing it from shining on the photosensitive transistors of the black group D. This makes the photosensitive transistors of the black group D unaffected by ambient light, only affected by ambient temperature and backlighting. This reduces the leakage current I of the three photosensitive groups R, G, and B. dSubtract the leakage current I of black group D d In theory, this completely avoids the influence of ambient temperature and backlight on the photosensitive transistor. In other words, the function of the photosensitive transistor in the black group D is essentially a correction parameter to eliminate the influence of ambient temperature and backlight, ensuring that the photosensitive transistors in the photosensitive groups R, G, and B are only affected by ambient light intensity.

[0062] The specific process for ambient light detection using the above four groups of light sensors is as follows:

[0063] Step (2.1) The power-on sequence of the display module is that the display panel (PNL) lights up first, followed by the backlight. First, test the measurement value of the black group D after the PNL is lit and before the backlight is lit. Since the backlight has not yet been lit at this time, the measurement value is not affected by the backlight illumination, but only by the temperature. It can be used as a temperature influence compensation value to provide the three light sensor groups R, G, and B for temperature compensation.

[0064] Step (2.2) After the backlight is turned on, test the measurement value of the black group D. The difference between the two measurement values ​​of the black group D is used as the backlight influence compensation value and provided to the three light sensor groups R, G and B for backlight illumination compensation.

[0065] However, the above solution has the following problems:

[0066] Problem (1) The black group D cannot perform real-time temperature compensation calibration for the three photosensitive groups R, G, and B: When the display module is in normal use, the black group D is affected by both ambient temperature and backlight illumination. Therefore, temperature compensation can only be performed at the moment the display module lights up (that is, after the PNL is lit and before the backlight is lit). In other words, the measured value of the black group D at the moment of power-on is provided as the temperature compensation value to the three photosensitive transistors R, G, and B. However, during normal use of the display module under different ambient temperatures, the black group D is affected by both temperature and backlight illumination. It is impossible to identify the influence of temperature alone, so real-time temperature compensation cannot be performed.

[0067] Problem (2) Inaccurate ambient temperature compensation: Due to the material properties, the black matrix layer BM in the display panel cannot completely block the ambient light. This results in the black group D photosensitive transistor being affected not only by the ambient temperature but also by some ambient light when the display module performs temperature compensation at the moment of screen lighting. Therefore, the black group D cannot accurately provide temperature compensation for the three photosensitive groups R, G, and B, which in turn reduces the accuracy of the ambient light detected by the R, G, and B photosensitive transistors.

[0068] Problem (3) Inaccurate backlight compensation: Due to the material properties, the black matrix layer BM in the display panel cannot completely block the ambient light. During normal screen use of the display module, the black group D will be affected by the ambient light, temperature and backlight. Therefore, it is inaccurate to use the difference between the measured value of the black group D at the moment of power-on and the value during normal display as the backlight compensation value to provide backlight compensation for the three photosensitive transistors R, G and B (affected by real-time temperature and real-time ambient light). That is, it cannot accurately provide backlight compensation for the three photosensitive groups R, G and B.

[0069] The relationship between the leakage current of the black group D photosensitive transistor and the backlight intensity is shown in the curve below. Figure 5 As shown, by Figure 5 It can be seen that when the ambient light intensity is the same, the leakage current is different when the backlight intensity is different. The backlight intensity can be represented by the backlight current, meaning that the backlight intensity affects the detection results of the photosensitive transistor. The relationship curve between the leakage current and ambient light intensity of the black group D photosensitive transistor is shown below. Figure 6 As shown, where Figure 6 When the temperature is the same across all groups of data, meaning the temperature is constant, ambient light intensity also affects the leakage current. The relationship between the leakage current of the photosensitive transistor in the black group (D) and ambient temperature is shown in the curve below. Figure 7 As shown.

[0070] Therefore, the current technical solution of using the black group D photosensitive transistor to compensate for temperature and backlight illumination of the detection results of the other three groups R, G, and B photosensitive transistors will lead to a decrease in the accuracy of the final detected ambient light intensity, affecting the product performance of the display module.

[0071] To address the aforementioned technical problems, this disclosure provides a display module, a display device, an ambient light detection method, and a storage medium.

[0072] Please refer to Figures 8 to 10 , Figure 8 This is a partial planar schematic diagram of the display module provided in an embodiment of this disclosure. Figure 9 To display module along Figure 8 Side view along the middle section line D-D' direction. Figure 10 To display module along Figure 8 Side view along the E-E' direction of the midsection line, as shown Figures 8 to 10As shown, the display module includes a cover plate 10, a display panel 20, and a backlight module 30 arranged sequentially along a first direction. The display panel 20 integrates a photosensitive group, a first correction photosensitive group D1, and a second correction photosensitive group D2. Each of the photosensitive group, the first correction photosensitive group D1, and the second correction photosensitive group D2 includes at least one photosensitive transistor. The light-emitting side of the display panel 20 is a light-transmitting area at the position corresponding to the photosensitive group and a light-shielding area at the position corresponding to the first correction photosensitive group D1 and the second correction photosensitive group D2. The backlight side of the display panel 20 is a light-transmitting area at the position corresponding to the photosensitive group and the first correction photosensitive group D1 and a light-shielding area at the position corresponding to the second correction photosensitive group D2.

[0073] In this embodiment, the first direction is the thickness direction of the display module, that is, the direction perpendicular to the plane of the display module. For example, the first direction is denoted as the Z direction. The light-emitting side of the display panel is the side where the display is performed, and the backlight side of the display panel is the side opposite to the light-emitting side. For example, the side of the display panel 20 with the cover plate 10 is the light-emitting side, and the side with the backlight module 30 is the backlight side.

[0074] The detection light sensing group is equivalent to the three light sensing groups R, G, and B in related technologies, and is used for real-time ambient light detection. The light-emitting side and backlight side of the display module have light-transmitting areas at the corresponding positions of the detection light sensing group, indicating that ambient light can enter the photosensitive transistors of the detection light sensing group from the light-emitting side, and backlight can enter the photosensitive transistors of the detection light sensing group from the backlight side. In other words, the detection result of the detection light sensing group is simultaneously affected by ambient temperature, backlight illumination, and ambient light. Specifically, the fact that the light-emitting side and backlight side of the display module have light-transmitting areas at the corresponding positions of the detection light sensing group can also be understood as follows: the orthographic projection of the light-transmitting area on the light-emitting side of the display module in a first plane at least covers the orthographic projection of the photosensitive transistors in the detection light sensing group in the first plane. Similarly, the orthographic projection of the light-transmitting area on the backlight side of the display module in a first plane at least covers the orthographic projection of the photosensitive transistors in the detection light sensing group in the first plane. This first plane is parallel to the display panel 20, that is, perpendicular to the first direction Z.

[0075] The first calibration light-sensing group D1 is equivalent to the black group D in related technologies. The light-emitting side of the display module is a light-shielding area at the corresponding position of the first calibration light-sensing group D1, and the backlight side is a light-transmitting area at the corresponding position of the first calibration light-sensing group D1. This means that ambient light cannot be incident on the photosensitive transistor of the first calibration light-sensing group D1 from the light-emitting side, while backlight can be incident on the photosensitive transistor of the first calibration light-sensing group D1 from the backlight side. That is, the detection result of the first calibration light-sensing group D1 is affected by both ambient temperature and backlight illumination. It can also be understood that the orthographic projection of the light-shielding area of ​​the light-emitting side of the display module in the first plane at least covers the orthographic projection of the photosensitive transistor in the first calibration light-sensing group D1 in the first plane. Similarly, the orthographic projection of the light-transmitting area of ​​the backlight side of the display module in the first plane at least covers the orthographic projection of the photosensitive transistor in the first calibration light-sensing group D1 in the first plane.

[0076] Compared to related technologies, the second calibration light sensor group D2 is a newly added light sensor group. The light-emitting side and backlight side of the display module are both shaded areas at their corresponding positions in the second calibration light sensor group D2. This indicates that ambient light cannot be incident on the photosensitive transistors of the second calibration light sensor group D2 from the light-emitting side, and backlight cannot be incident on the photosensitive transistors of the second calibration light sensor group D2 from the backlight side. In other words, the detection result of the second calibration light sensor group D2 is not affected by ambient light or backlight illumination, but only by temperature. Alternatively, it can be understood that the orthographic projection of the shaded area on the light-emitting side of the display module onto the first plane at least covers the orthographic projection of the photosensitive transistors in the second calibration light sensor group D2 onto the first plane. Similarly, the orthographic projection of the shaded area on the backlight side of the display module onto the first plane at least covers the orthographic projection of the photosensitive transistors in the second calibration light sensor group D2 onto the first plane.

[0077] Assuming the sensing result of the detection light sensor group is represented as the first sensing result Y1, the sensing result of the first correction light sensor group D1 is represented as the second sensing result Y2, and the sensing result of the second correction light sensor group D2 is represented as the third sensing result Y3, then the third sensing result Y3 can represent the ambient temperature compensation value. The difference between the third sensing result Y3 and the second sensing result Y2 can represent the backlight compensation value. By using the ambient temperature compensation value and the backlight compensation value to correct or compensate for the first sensing result Y1, the true ambient light detection result can be obtained.

[0078] Compared with related technologies, the display module of this disclosure, by adding a second correction light sensor group and setting both the light-emitting side and the backlight side of the display module at the location of the second correction light sensor group as light-shielding areas, can ensure that the detection result of the second correction light sensor group is only affected by temperature. Simultaneously, by setting the light-emitting side of the display module at the location of the first correction light sensor group as a light-shielding area and the backlight side at the location of the first correction light sensor group as a light-transmitting area, the detection result of the first correction light sensor group can be ensured that it is only affected by backlight and temperature. Processing the detection results of the first and second correction light sensors can yield results that are only affected by temperature. The backlight-related influence value is set in this way so that, on the one hand, the detection results of the second calibration light sensor group can be used to perform real-time temperature compensation on the detection results of the detection light sensor group; on the other hand, the real-time backlight influence value can be calculated using the detection results of the first and second calibration light sensor groups, and then the backlight influence value can be used to perform real-time backlight compensation on the detection results of the detection light sensor group. That is, this disclosure can perform real-time backlight correction and real-time temperature correction on the detection results of the detection light sensor group, so as to obtain detection results that are only related to ambient light intensity and improve the accuracy of ambient light detection results.

[0079] In one possible implementation, such as Figure 8 and Figure 9 The display panel 20 includes a display area and a border area surrounding the display area. The cover plate 10 includes a first light-transmitting area and a first light-shielding area surrounding the first light-transmitting area. The backlight module 30 includes a second light-transmitting area and a second light-shielding area surrounding the second light-transmitting area. The orthographic projection of the display area in a first plane is a first projection. The orthographic projection of the first light-transmitting area in the first plane is a second projection. The orthographic projection of the second light-transmitting area in the first plane is a third projection. The second projection covers the first projection and is larger than the first projection. The third projection covers the second projection. The display panel 20 includes a first substrate 210, a liquid crystal layer 220, and a second substrate 230 stacked along the first direction. The detection light sensor group, the first correction light sensor group D1, and the second correction light sensor group D2 are integrated on the second substrate 230. The orthographic projection of the detection light sensor group and the first correction light sensor group D1 in the first plane is located in the projection area of ​​the second projection that exceeds the first projection. The orthographic projections of the first light-blocking area and the second light-blocking area in the first plane both cover the orthographic projection of the second correction light sensor group D2 in the first plane. The first substrate 210 has a color filter layer CF1 at the position corresponding to the detection light sensor group and a first black matrix layer BM1 at the position corresponding to the first correction light sensor group D1 and the second correction light sensor group D2. The first plane is a plane parallel to the display panel 20.

[0080] In this embodiment, the size of the light-transmitting area (i.e., the second light-transmitting area) of the backlight module 30 is slightly larger than or equal to the size of the light-transmitting area (i.e., the first light-transmitting area) of the cover plate 10, and the size of the light-transmitting area of ​​the cover plate 10 is slightly larger than the size of the display area. The position and size relationship of the display area, the first light-transmitting area, and the second light-transmitting area can be described by the relationship between their orthographic projections in a first plane, where the first plane is parallel to the display panel 20, that is, a plane perpendicular to the first direction Z, and a plane parallel to the second direction Y and the third direction X.

[0081] like Figure 8 and Figure 9 As shown, the second projection covering and exceeding the first projection can be understood as follows: the first light-transmitting area corresponds to the display area, and the size of the first light-transmitting area is larger than the size of the display area. The third projection at least covering the second projection includes two scenarios: the first is that the third projection completely overlaps with the second projection, which can also be understood as the second light-transmitting area corresponding to the first light-transmitting area and having the same size; the second is that the third projection covers the second projection and exceeds the second projection, which can also be understood as the second light-transmitting area corresponding to the first light-transmitting area and having a larger size than the first light-transmitting area.

[0082] Optional, such as Figure 9 and Figure 10 As shown, the cover plate 10 includes a transparent cover plate body 110 and an ink layer 120 disposed on the edge of the transparent cover plate body 110. The area of ​​the transparent cover plate body 110 without the ink layer 120 forms the first light-transmitting area, and the area of ​​the transparent cover plate body 110 with the ink layer 120 forms the first light-shielding area.

[0083] For example, the transparent cover body 110 is a glass cover.

[0084] The ink layer 120 is disposed in the edge area of ​​the transparent cover plate body 110. It is usually a black ink layer, which can block light from passing through. Therefore, the area where the ink layer 120 is disposed can form a light-shielding area, that is, the first light-shielding area. Assuming that the inner boundary line of the ink layer 120 in the cover plate 10 is denoted as CG-VA, the area enclosed by CG-VA is the first light-transmitting area. Assuming that the outer boundary line of the display area is denoted as AA, CG-VA is disposed around AA.

[0085] Optional, such as Figure 9 and Figure 10As shown, the backlight module 30 includes a frame 310 and a light-shielding tape 320. The light-shielding tape 320 is disposed on the side of the frame 310 facing the display panel 20. The area of ​​the backlight module 30 not blocked by the light-shielding tape 320 forms the second light-transmitting area, and the area of ​​the backlight module 30 where the light-shielding tape 320 is disposed forms the second light-shielding area.

[0086] In addition, the backlight module 30 also includes optical films, light guide plates, and back plates stacked sequentially along the direction away from the display panel 20. The optical films include, but are not limited to, upper and lower prisms, diffuser plates, and other structures. Figure 9 The optical film, light guide plate and back plate are uniformly marked as 330. The frame 310 is set on the outer periphery of the light guide plate, and the light-shielding tape 320 is set on the side of the frame 310 facing the display panel 20. The light-shielding tape 320 extends along the direction of the optical film and goes beyond the edge of the frame 310. That is, a part of the light-shielding tape 320 covers the upper edge area of ​​the optical film.

[0087] Assuming the inner boundary line of the light-shielding tape 320 in the backlight module 30 is represented as BLU-VA, then the inner area enclosed by BLU-VA is the second light-transmitting area. BLU-VA can overlap with CG-VA or be set on the outer periphery of CG-VA, that is, BLU-VA is set around CG-VA, which means that BLU-VA is farther away from the boundary line AA of the display area than CG-VA.

[0088] In this embodiment of the present disclosure, the display panel 20 includes a first substrate 210, a liquid crystal layer 220 and a second substrate 230 stacked along a first direction Z, wherein one of the first substrate 210 and the second substrate 230 is a color filter substrate and the other is an array substrate.

[0089] For example, the first substrate 210 is a color filter substrate and the second substrate 230 is an array substrate. At this time, the first substrate 210 is close to the cover plate 10 and the second substrate 230 is close to the backlight module 30.

[0090] For example, the first substrate 210 is an array substrate and the second substrate 230 is a color filter substrate. At this time, the second substrate 230 is close to the cover plate 10 and the first substrate 210 is close to the backlight module.

[0091] The embodiments disclosed herein are described using the first substrate 210 as a color filter substrate and the second substrate 230 as an array substrate as an example. Each photosensitive transistor in the detection photosensitive group, the first correction photosensitive group D1 and the second correction photosensitive group D2 is integrated on the array substrate, that is, on the second substrate 230.

[0092] In addition, such as Figure 9As shown, the display panel 20 further includes a first polarizer 240 disposed between the first substrate 210 and the cover plate 10, and a second polarizer 250 disposed between the second substrate 230 and the backlight module 30. The display module further includes an optical adhesive layer 40 disposed between the cover plate 10 and the first polarizer 240.

[0093] In order to ensure that the light-emitting side and backlight side of the display module are light-transmitting or light-blocking areas at the positions of the detection light sensor group, the first correction light sensor group D1, and the second correction light sensor group D2, the positions of the detection light sensor group, the first correction light sensor group D1, and the second correction light sensor group D2 need to be set.

[0094] Specifically, the orthographic projection of the detection light sensor group and the first correction light sensor group D1 onto the first plane is located within the projection area of ​​the second projection that extends beyond the first projection. Furthermore, the first substrate 210 has a color filter layer CF1 at a position corresponding to the detection light sensor group and a first black matrix layer BM1 at a position corresponding to the first correction light sensor group D1, thereby achieving:

[0095] (1) The phototransistor in the photosensitive group is not covered by the ink layer 120 on the light-emitting side, but only by the color filter layer CF1. That is, the light-emitting side is a light-transmitting area at the corresponding position of the photosensitive group, and light of a specific color allowed to pass through the color filter layer CF1 can pass through. On the backlight side, it is not covered by the light-shielding tape 320. That is, the backlight side is a light-transmitting area at the corresponding position of the photosensitive group, and the backlight can be sensed by the photosensitive transistor in the photosensitive group.

[0096] (2) The phototransistor in the first correction photosensitive group D1 is not covered by the ink layer 120 on the light-emitting side, but is covered by the first black matrix layer BM1. Therefore, the light-emitting side is a light-shielding area at the corresponding position of the first correction photosensitive group D1, and the ambient light cannot be sensed by the phototransistor in the first correction photosensitive group D1. On the backlight side, it is not covered by the light-shielding tape 320, that is, the backlight side is a light-transmitting area at the corresponding position of the first correction photosensitive group D1, and the backlight can be sensed by the phototransistor in the first correction photosensitive group D1.

[0097] Specifically, the orthographic projections of the first and second light-blocking areas onto the first plane both cover the orthographic projection of the second corrected light-sensing group D2 onto the first plane, which can achieve the following:

[0098] (3) The photosensitive transistor in the second photosensitive group D2 is covered by the ink layer 120 on the light-emitting side. Therefore, the light-emitting side is a light-shielding area at the corresponding position of the first photosensitive group D1. Ambient light is blocked by the ink layer 120 and will not be sensed by the photosensitive transistor in the second photosensitive group D2. The backlight side is blocked by the light-shielding tape 320. At this time, the backlight side is a light-shielding area at the corresponding position of the second photosensitive group D2. The backlight is blocked by the light-shielding tape 320 and will not be sensed by the photosensitive transistor in the second photosensitive group D2. In addition, a light-shielding metal layer is usually provided on the second substrate 230 at the gate position. The light-shielding metal layer can also provide blocking of backlight, further blocking backlight from entering the photosensitive transistor in the second photosensitive group D2.

[0099] In related technologies, the border area is covered with a first black matrix layer BM1. In this embodiment, to achieve a light-transmitting area at the location of the detection light sensor group and a light-blocking area at the location of the first correction light sensor group D1 and the second correction light sensor group D2 on the light-emitting side, the first black matrix layer BM1 at the location of the detection light sensor group needs to be hollowed out and covered with a color filter layer CF1. However, the first black matrix layer BM1 at the locations of the first correction light sensor group D1 and the second correction light sensor group D2 is not processed, that is, the first black matrix layer BM1 at the locations of the first correction light sensor group D1 and the second correction light sensor group D2 is retained. Therefore, the second correction light sensor group D2 is simultaneously blocked by the first black matrix layer BM1 and the ink layer 120, achieving a better opacity effect and preventing ambient light from shining on the second correction light sensor group D2.

[0100] In one possible implementation, the photosensitive group includes at least a first color photosensitive group, a second color photosensitive group, and a third color photosensitive group, and the color filter layer includes a first color filter layer, a second color filter layer, and a third color filter layer. The first substrate has the first color filter layer disposed at a position corresponding to the first color photosensitive group, the second color filter layer disposed at a position corresponding to the second color photosensitive group, and the third color filter layer disposed at a position corresponding to the third color photosensitive group.

[0101] Optionally, the first color, the second color, and the third color can be one of red, green, and blue, respectively. For example, as shown... Figure 8As shown, the first color is red, the second color is green, and the third color is blue. The first color detection light sensor group is denoted as R1, the second color detection light sensor group as G1, and the third color detection light sensor group as B1. The first color filter layer is denoted as R-CF1, the second color filter layer as G-CF1, and the third color filter layer as B-CF1. Then, the photosensitive transistor in the first color detection light sensor group R1 is covered by the first color filter layer R-CF1, the photosensitive transistor in the second color detection light sensor group G1 is covered by the second color filter layer G-CF1, and the photosensitive transistor in the third color detection light sensor group B1 is covered by the third color filter layer B-CF1.

[0102] In one possible implementation, the first substrate is further provided with a first color filter layer, a second color filter layer and a third color filter layer at a position corresponding to the first correction photosensitive group, wherein the first color filter layer is disposed in the same layer as the first color filter layer, the second color filter layer is disposed in the same layer as the second color filter layer, and the third color filter layer is disposed in the same layer as the third color filter layer.

[0103] Please refer to Figure 11 , Figure 11 for Figure 9 A magnified view of a portion of region Q2 in the middle area, as shown below. Figure 11 As shown in this embodiment, in addition to the first black matrix layer BM1, the first correction photosensitive group D1 is also provided with a first color filter layer R-CF2, a second color filter layer G-CF2, and a third color filter layer B-CF2 stacked along the first direction Z. Figure 8 BM1&(R-CF2)&(G-CF2)&(B-CF2) represents the stacked structure of the first black matrix layer BM1, the first color filter layer R-CF2, the second color filter layer G-CF2, and the third color filter layer B-CF2.

[0104] Since any light can be decomposed into three primary colors: blue, green, and red, with wavelengths of 380nm–500nm (blue light), 490nm–600nm (green light), and 600nm–760nm (red light), even if blue and green light overlap, the overlapping wavelengths will not pass through the red color filter, and even if green and red light overlap, the overlapping wavelengths will not pass through the blue color filter. For an example, please refer to [reference needed]. Figure 12 , Figure 12This is a schematic diagram showing the visible light transmission bands of the color filter layers R-CF2, G-CF2, and B-CF2 as measured in actual measurements. Different colors represent the visible light bands transmitted by different color filter layers. Therefore, visible ambient light will not pass through the color filter layer composed of blue, green, and red colors. In other words, the superposition of the first color filter layer R-CF2, the second color filter layer G-CF2, and the third color filter layer B-CF2 is equivalent to a black blocking layer. Light will not pass through this black blocking layer, which can further improve the opacity of the first correction light sensor group D1 and prevent ambient light from shining on the first correction light sensor group D1.

[0105] In summary, when the first correction light sensor group D1 is covered by the first black matrix layer BM1, the first color filter layer R-CF2, the second color filter layer G-CF2, and the third color filter layer B-CF2, it can be ensured that the first correction light sensor group D1 is completely unaffected by external ambient light. During normal screen operation of the display module, the measured value of the first correction light sensor group D1 minus the measured value of the second correction light sensor group D2 can be understood as the real-time backlight illumination impact value, that is, the backlight illumination compensation value.

[0106] In this disclosure, unless otherwise stated, the term "co-layer arrangement" refers to two layers, components, members, elements, or portions that can be formed using the same fabrication process (e.g., patterning process), and that these two layers, components, members, elements, or portions are generally formed of the same material. For example, co-layer arrangement of two or more functional layers means that these co-layer functional layers can be formed using the same material layer and the same fabrication process, thereby simplifying the fabrication process and reducing the cost of the display substrate.

[0107] For example, the first color filter layer R-CF2 being co-layered with the first color filter layer R-CF1 means that the first color filter layer R-CF2 is formed synchronously above the first correction photosensitive group D1 during the process of the first color filter layer R-CF1, thus eliminating the need for additional processes and costs.

[0108] It is understood that the embodiments disclosed herein do not limit the stacking order of the first color filter layer R-CF2, the second color filter layer G-CF2, and the third color filter layer B-CF2 on the first black matrix layer BM1, but rather determine it according to the process order of the first color filter layer R-CF1, the second color filter layer G-CF1, and the third color filter layer B-CF1. For example, Figure 11In the embodiment shown, the third color filter layer B-CF2 is adjacent to the first black matrix layer BM1, the second color filter layer G-CF2 is located between the first color filter layer R-CF2 and the third color filter layer B-CF2, and the first color filter layer R-CF2 is located on the side of the second color filter layer G-CF2 away from the first black matrix layer BM1. At this time, the fabrication process sequence of the color filter substrate 210 is as follows: color filter substrate → fabrication of the first black matrix layer BM1 (the first black matrix layer BM1 above the photosensitive transistors of the first color detection photosensitive group R1, the second color detection photosensitive group G1 and the third color detection photosensitive group B1 is hollowed out, while the first black matrix layer BM1 above the photosensitive transistors of the first correction photosensitive group D1 and the second correction photosensitive group D2 is not hollowed out) → fabrication of the blue color filter (the blue color filter is coated above the photosensitive group B1 and the photosensitive transistor D1) → fabrication of the green color filter (the green color filter is coated above the photosensitive group G1 and the photosensitive transistor D1) → fabrication of the red color filter (the red R color filter is coated above the photosensitive group R1 and the photosensitive transistor D1). Thus, the color filter substrate directly above the photosensitive transistor D1 consists of four layers from top to top: BM1, B-CF2, G-CF2, and R-CF2. For example, the size of B-CF2 can be 1020*25*2.67μm, the size of G-CF2 can be 1020*25*2.79μm, and the size of R-CF2 can be 1020*25*2.98μm.

[0109] In one possible implementation, the first substrate is further provided with a second black matrix layer at a position corresponding to the first correction photosensitive group.

[0110] For example, please refer to Figure 13 , Figure 13 To illustrate the structure of another embodiment of the display module, in this embodiment, in addition to the first black matrix layer BM1, a second black matrix layer BM2 is also provided above the first correction light sensor group D1. Thus, there are two black matrix layers above the first correction light sensor group D1, which can further improve the light-blocking performance of the first correction light sensor group D1, prevent ambient light from shining on the first correction light sensor group D1, and ensure that the first correction light sensor group D1 is not affected by external ambient light. During the normal use of the display module, the measured value of the first correction light sensor group D1 minus the measured value of the second correction light sensor group D2 is the real-time backlight illumination impact value, that is, the backlight illumination compensation value.

[0111] In one possible implementation, the border area includes a bound area and an unbound area located on opposite sides of the second direction of the display area. The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are all disposed on the same side as the unbound area, and the first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at intervals along a third direction, which is perpendicular to the second direction.

[0112] like Figure 1 and Figure 8 As shown, the bezel area of ​​the display panel 20 includes a bonding area. For example, the bonding area is located within the lower bezel area of ​​the display area, and each light sensor group is disposed in the non-bonding area on the opposite side of the bonding area, that is, within the upper bezel area of ​​the display panel 20. In addition, each light sensor group R1, G1, B1, D1 and D2 is disposed at intervals along a third direction X within the upper bezel area.

[0113] Optionally, the first color detection light sensor group R1, the second color detection light sensor group G1, the third color detection light sensor group B1, the first correction light sensor group D1, and the second correction light sensor group D2 are equally spaced along the third direction X. That is, any two adjacent light sensor groups have the same distance g along the third direction X. For example, along the third direction X, the distance between the first color detection light sensor group R1 and the second color detection light sensor group G1 is equal to the distance between the second color detection light sensor group G1 and the third color detection light sensor group, and the distance between the third color detection light sensor group B1 and the first correction light sensor group D1 is equal to the distance between the first correction light sensor group D1 and the second correction light sensor group D2.

[0114] For example, the distance g = 1000 μm, or the distance g = 1040 μm.

[0115] Optionally, the first color detection light sensor group R1, the second color detection light sensor group G1, the third color detection light sensor group B1, the first correction light sensor group D1, and the second correction light sensor group D2 each include multiple light-sensing transistors. Each light-sensing transistor includes a control terminal, a first terminal, and a second terminal. The control terminal is configured to be grounded, the first terminal is configured to be connected to a first voltage source, and the second terminal is a sensing result output terminal.

[0116] Please refer to Figure 14 , Figure 14 This is a schematic diagram of the film structure of any phototransistor, such as... Figure 14As shown, any phototransistor includes a gate formed on the second substrate 230, a gate insulating layer (GI) covering the gate, an active layer (ACT) formed on the gate insulating layer, and a source / drain electrode layer (SD) formed above the active layer. The source / drain electrode layer (SD) includes a source electrode and a drain electrode, and a passivation layer (PVX) covering the source / drain electrode layer (SD). It is understood that the phototransistor can also employ other existing structures, and the embodiments disclosed herein do not modify the specific structure of the phototransistor.

[0117] In this phototransistor, the control terminal is the gate, the first terminal is the source, and the second terminal is the drain.

[0118] Each photosensitive group includes multiple photosensitive transistors, for example, such as Figure 15 As shown, each light sensor group includes three light-sensitive transistors. The presence of multiple light-sensitive transistors in each light sensor group can improve the detection accuracy of light intensity in a given scene and reduce detection errors.

[0119] The circuit structure of each photosensitive transistor in the display module is as follows: Figure 15 As shown, in the light-sensing groups R1, G1, B1, D1, and D2, the gate of each light-sensing transistor is connected to the first signal line g1-g2, and the source of each light-sensing transistor is connected to the second signal line s1-s2. The drain of the three light-sensing transistors in the first color light-sensing group R1 is connected to the first detection line r1. The drain of the three light-sensing transistors in the second color light-sensing group G1 is connected to the second detection line g1. The drain of the three light-sensing transistors in the third color light-sensing group B1 is connected to the third detection line b1. The drain of the three light-sensing transistors in the first correction light-sensing group D1 is connected to the first correction line d1. The drain of the three light-sensing transistors in the second correction light-sensing group D2 is connected to the second correction line d2.

[0120] During operation, no voltage is applied to the first signal lines g1-g2, meaning no voltage is applied to the gates of each phototransistor, effectively grounding the gates of each phototransistor. The second signal lines s1-s2 are input to the first voltage source, applying a certain voltage to the source of each phototransistor. Then, the leakage current I on the first detection line r1, the second detection line g1, the third detection line g1, the first correction line d1, and the second correction line d2 is detected. d The current ambient light intensity can be calculated by measuring the size of the light source.

[0121] Optionally, the distance S between the photosensitive transistor in the second correction light-sensing group D2 and the display area in the second direction is: S = max(s1, s2) + a, where max(s1, s2) represents the maximum value of s1 and s2, a is a constant, s1 represents the critical distance in the second direction Y between the photosensitive transistor and the inner boundary line of the first light-shielding area when the ambient light is blocked by the first light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group D2, and s2 represents the critical distance in the second direction Y between the photosensitive transistor and the inner boundary line of the second light-shielding area when the backlight is blocked by the second light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group D2.

[0122] Please refer to Figure 9 and Figure 16 , Figure 16 This is a schematic diagram showing ambient light incident on the second correction light sensor group D2, as shown. Figure 16 As shown, assuming the phototransistor in the second correction photosensitive group D2 is denoted as TFT2, to prevent ambient light from incident on TFT2, the position of TFT2 needs to be specifically designed. Specifically, ambient light shines on the cover plate 10 and is refracted at the cover plate 10. To ensure that ambient light cannot be incident on TFT2, it is necessary to ensure that ambient light at any large angle in the light-emitting display area does not shine on TFT2. Assuming the incident angle of ambient light at the cover plate 10 is β1, then as long as β1 ≥ 90°, the ambient light will not shine on TFT2.

[0123] For ambient light, the refractive index formula is: n1*sinβ1=n2*sinβ2, where n1 represents the air refractive index, n2 represents the refractive index of the cover plate, and β2 represents the angle of refraction of ambient light in the cover plate 10. Typically, the air refractive index n1 is 1, and the refractive index n2 of the glass cover plate is 1.5. According to n1*sinβ1=n2*sinβ2 (β1≥90°), we know that sinβ2≥0.67, that is, β2≤42° is sufficient. Furthermore, the relationship between the refraction angle β2, the critical distance s1, the thickness, and T1 is: s1 = T1 / tan(90°-β2), where T1 represents the sum of the thicknesses of the first polarizer 240, the optical adhesive layer 40, and the first substrate 210, and s1 represents the critical distance in the second direction Y between the photosensitive transistor TFT2 and the inner boundary line (CG-VA) of the first light-shielding area when ambient light is blocked from entering the photosensitive transistor TFT2 by the first light-shielding area (i.e., ink layer 120). This critical distance s1 is also the minimum distance value, which is the distance between the photosensitive transistor TFT2 and the inner boundary line of the first light-shielding area when ambient light just illuminates the edge of the photosensitive transistor TFT2. It should be noted that although a liquid crystal layer 220 is also disposed between the first substrate 210 and the photosensitive transistor TFT2, the thickness of the liquid crystal layer 220 is very thin, and its thickness is not on the same order of magnitude as that of other film layers. Therefore, in this embodiment, the thickness of the liquid crystal layer 230 is ignored.

[0124] In the display module, the maximum value of T1 is usually 0.386mm. Therefore, s1 = 0.386 / tan(90°-β2) = 0.347mm. That is, in the second direction Y, as long as the distance between the edge of the phototransistor TFT2 and CG-VA is greater than 0.347mm, it can be ensured that ambient light does not shine on the phototransistor TFT2, and the effect of the phototransistor TFT2 being completely blocked by the first black matrix layer BM1 and the ink layer 120 can be fully realized.

[0125] Please refer to Figure 17 , Figure 17 This is a curve showing the relationship between the leakage current of the photosensitive transistor in the second calibration photosensitive group D2 and ambient light. The horizontal axis represents the ambient light intensity in lux, and the vertical axis represents the leakage current I. d The size, measured in microamperes, and Figure 17 In the diagram, #1, #2, and #3 represent three different sample display modules, which are composed of... Figure 17 It can be seen that, with the temperature and backlight fixed, the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 is... d The leakage current I remains essentially unchanged when the ambient light intensity changes, meaning it is largely unaffected by ambient light intensity. Furthermore, the leakage current I varies with different temperatures. d They are different sizes.

[0126] Similarly, on the backlight side, it is necessary to ensure that the backlight does not shine on the photosensitive transistor TFT2 as much as possible. Please refer to [reference needed]. Figure 9 and Figure 18 , Figure 18 This is a schematic diagram showing the backlight incident on the second correction light sensor group D2, where the light intensity distribution of the light emitted from the backlight source within various viewing angles is as follows: Figure 19 As shown in the figure, the horizontal axis represents the viewing angle range and the vertical axis represents the light intensity. It can be seen that the light emitted by the backlight is concentrated in the viewing angle range of (-45°, +45°). The backlight brightness beyond (-45°, +45°) is very small and can be completely blocked by the Gate metal light-shielding layer below the photosensitive transistor TFT2 (that is, near the backlight side). Therefore, the main consideration is that the backlight in the viewing angle range of (-45°, +45°) should not directly shine on the photosensitive transistor TFT2.

[0127] The relationship between the backlight incident angle α, the critical distance s2, the thickness, and T2 satisfies s2=T2 / tanα (α≤45°), where α represents the incident angle of the backlight on the second polarizer 250, T2 represents the sum of the thicknesses of the second polarizer 250 and the second substrate 230, and s2 represents the critical distance in the second direction Y between the photosensitive transistor TFT2 and the inner boundary line (i.e., BLU-VA) of the second light-shielding area when the backlight is blocked by the second light-shielding area and cannot be incident on the photosensitive transistor TFT2 in the second correction photosensitive group D2. This critical distance s2 is also the minimum distance value, which is the distance between the photosensitive transistor TFT2 and the inner boundary line of the second light-shielding area when the backlight just illuminates the edge of the photosensitive transistor TFT2 at 45°.

[0128] In the display module, the maximum value of thickness and T2 is usually 0.237mm, therefore s2=T2 / tanα=0.237mm.

[0129] Optionally, when designing s2, the assembly tolerance of the backlight module 30 can be further considered. That is, the second light-shielding area can block backlight from shining onto the photosensitive transistor TFT2 while taking into account the assembly tolerance of the backlight module 30. The backlight assembly tolerance can be expressed as sqrt(m1^2+m2^2+m3^2+m4^2+m5^2), where m1 represents the single-sided tolerance of the backlight module shape, m2 represents the distance tolerance between the BUL VA and the backlight module shape, m3 represents the assembly tolerance of the display module, m4 represents the display area tolerance, and m5 represents the distance tolerance between the display area boundary line AA and the photosensitive transistor TFT2. For example, when m1 = 0.06mm, m2 = 0.12mm, m3 = 0.1mm, m4 = 0, and m5 = 0, the backlight assembly tolerance is expressed as: sqrt(0.06^2 + 0.12^2 + 0.1^2), where s1 = T2 / tan(45°) + sqrt(0.06^2 + 0.12^2 + 0.1^2) = 0.351mm.

[0130] Please refer to Figure 20 , Figure 20 This is a curve showing the relationship between the leakage current of the photosensitive transistor in the second calibration photosensitive group D2 and the backlight and ambient light. The horizontal axis represents the backlight intensity in lux, and the vertical axis represents the leakage current I. d The size is determined by Figure 20 It can be seen that the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 is... d The backlight intensity remains essentially unchanged when the backlight intensity changes, meaning it is largely unaffected by the backlight intensity, and the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 is... d It remains essentially unchanged even when the ambient light intensity changes, and is also largely unaffected by the ambient light intensity.

[0131] Furthermore, in the second direction Y, the distance between the inner boundary line CG-VA of the first light-shielding area and the outer boundary line AA of the display area is typically 0.2 mm, which is the constant a shown above. Therefore, the distance between the edge of the photosensitive transistor TFT2 near the display area and the display area can be expressed as S = max(s1, s2) + a.

[0132] For example, S = 0.351 + 0.2 = 0.551 mm.

[0133] Optionally, in this embodiment, the size design of the photosensitive transistors in each photosensitive group is as follows: Figure 21As shown, where dx = 980μm, dy = 15μm, d2 = 20μm, d1 = 10μm, f = 5μm, c1 = 60μm, g = 1000μm, and e = 0.9~1.1mm, dx represents the length of the photosensitive transistor in the third direction X, dy represents the width of the photosensitive transistor in the second direction Y, d2 represents the distance between the color filter layer and the corresponding photosensitive transistor in the third direction X, g represents the distance between adjacent photosensitive groups in the third direction X, which can be represented by the distance between the edges of two color filter layers on the photosensitive transistor, e represents the distance of the upper border of the display module, d1 represents the width of the color filter layer extending beyond the photosensitive transistor in the second direction Y, c1 represents the distance between the color filter layer above the photosensitive transistor in the second direction Y and the display area, and S represents the distance between the lower edge (i.e., the edge near the display area) of the photosensitive transistor TFT2 in the second correction photosensitive group D2 and the display area. It is understood that in the embodiments of this disclosure, the photosensitive transistors in each photosensitive group have the same size, that is, dx and dy are the same.

[0134] As configured above, on the one hand, the newly added second correction photosensitive group D2 will not cause an increase in the width of the upper bezel of the display module. Specifically, the width of each photosensitive transistor in the second direction Y is 15μm. At this time, the distance from the upper side of the photosensitive transistor TFT2 to the upper edge of the display module (i.e., the PNL boundary line) is eS-15μm. When the upper bezel e=1mm, the distance from the upper side of the photosensitive transistor TFT2 to the upper edge of the display module is 1mm-0.551mm-0.015mm=0.434mm, which means there is 0.434mm of space to place the COM layer and GND traces, so it will not cause an increase in the upper bezel of the display module. On the other hand, in the display module of this embodiment, the ink layer 120 on the cover plate 10 will not block the detection photosensitive group from receiving ambient light, and it will not change the existing design of the backlight module 30, making it simple to implement.

[0135] Based on the same inventive concept, a second aspect of this disclosure provides a display device including the display module as described above.

[0136] For example, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. This embodiment does not limit this.

[0137] For example, the display module is a liquid crystal display module.

[0138] Based on the same inventive concept, a third aspect of this disclosure provides an ambient light detection method applicable to the display module described above, such as... Figure 22 As shown, the ambient light detection method includes:

[0139] Step S10: Obtain the first sensing result output by the detection light sensor group, the second sensing result output by the first correction light sensor group, and the third sensing result output by the second correction light sensor group, wherein the third sensing result is a temperature influence value.

[0140] Step S20: Calculate the backlight influence value based on the second sensing result and the third sensing result.

[0141] Step S30: Correct the first sensing result according to the backlight influence value and temperature influence value to obtain the ambient light detection result.

[0142] Compared with related technologies, in the embodiments of this disclosure, the sensing result of the second correction light sensor group is only related to temperature. Therefore, the third sensing result can be used to compensate for the influence of ambient temperature on the first sensing result. Furthermore, the third sensing result can also be used for real-time temperature compensation when the display module is in normal screen-on use. The sensing result of the first correction light sensor group is only related to temperature and backlight. Therefore, the third sensing result minus the second sensing result is the real-time backlight influence value, which can be used to compensate for the influence of backlight on the first sensing result, thereby obtaining the true ambient light intensity.

[0143] Based on the same inventive concept, the fourth aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the ambient light detection method described above.

[0144] Obviously, the above embodiments of this disclosure are merely examples for clearly illustrating this disclosure, and are not intended to limit the implementation of this disclosure. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all implementation methods here. Any obvious variations or modifications derived from the technical solutions of this disclosure are still within the protection scope of this disclosure.

Claims

1. A display module, characterized in that, The device includes a cover plate, a display panel, and a backlight module arranged sequentially along a first direction. The display panel integrates a photosensitive group, a first correction photosensitive group, and a second correction photosensitive group. Each of the photosensitive group, the first correction photosensitive group, and the second correction photosensitive group includes at least one photosensitive transistor. The light-emitting side of the display panel is a light-transmitting area at the position corresponding to the photosensitive group and a light-shielding area at the position corresponding to the first correction photosensitive group and the second correction photosensitive group. The backlight side of the display panel is a light-transmitting area at the position corresponding to the photosensitive group and the first correction photosensitive group and a light-shielding area at the position corresponding to the second correction photosensitive group. The display panel includes a display area and a border area surrounding the display area; the cover plate includes a first light-transmitting area and a first light-shielding area surrounding the first light-transmitting area; and the backlight module includes a second light-transmitting area and a second light-shielding area surrounding the second light-transmitting area. The frame area includes a bound area and an unbound area located on opposite sides of the second direction of the display area. The detection light sensor group, the first correction light sensor group, and the second correction light sensor group are all arranged on the same side as the unbound area, and the detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at intervals along a third direction. The second direction and the third direction are parallel to the first plane, and the third direction is perpendicular to the second direction. The first plane is a plane parallel to the display panel. The distance S between the photosensitive transistor in the second correction light-sensing group and the display area in the second direction is: S = max(s1,s2) + a, where max(s1,s2) represents the maximum value of s1 and s2, a is a constant, s1 represents the critical distance in the second direction between the photosensitive transistor and the inner boundary line of the first light-shielding area when the ambient light is blocked by the first light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group, and s2 represents the critical distance in the second direction between the photosensitive transistor and the inner boundary line of the second light-shielding area when the backlight is blocked by the second light-shielding area and cannot be incident on the photosensitive transistor in the second correction light-sensing group.

2. The display module according to claim 1, characterized in that, The orthographic projection of the display area in the first plane is the first projection, the orthographic projection of the first light-transmitting area in the first plane is the second projection, and the orthographic projection of the second light-transmitting area in the first plane is the third projection. The second projection covers the first projection and is larger than the first projection, and the third projection covers the second projection. The display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked along the first direction. The light-sensing group, the first correction light-sensing group, and the second correction light-sensing group are integrated on the second substrate. The orthographic projections of the light-sensing group and the first correction light-sensing group in the first plane are located in the projection area where the second projection exceeds the first projection. The orthographic projections of the first light-shielding area and the second light-shielding area in the first plane both cover the orthographic projection of the second correction light-sensing group in the first plane. The first substrate has a color filter layer at the position corresponding to the light-sensing group and a first black matrix layer at the positions corresponding to the first correction light-sensing group and the second correction light-sensing group.

3. The display module according to claim 2, characterized in that, The detection light sensor group includes at least a first color detection light sensor group, a second color detection light sensor group, and a third color detection light sensor group. The color filter layer includes a first color filter layer, a second color filter layer, and a third color filter layer. The first substrate has a first color filter layer disposed at a position corresponding to the first color detection light sensor group, a second color filter layer disposed at a position corresponding to the second color detection light sensor group, and a third color filter layer disposed at a position corresponding to the third color detection light sensor group.

4. The display module according to claim 3, characterized in that, The first substrate is further provided with a first color filter layer, a second color filter layer and a third color filter layer stacked along the first direction at a position corresponding to the first correction photosensitive group. The first color filter layer is disposed in the same layer as the first color filter layer, the second color filter layer is disposed in the same layer as the second color filter layer, and the third color filter layer is disposed in the same layer as the third color filter layer.

5. The display module according to claim 3, characterized in that, The first substrate is further provided with a second black matrix layer at the position corresponding to the first correction photosensitive group, and the second black matrix layer and the first black matrix layer are stacked together along the first direction.

6. The display module according to claim 3, characterized in that, The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are all arranged on the same side as the non-binding area, and the first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at intervals along a third direction.

7. The display module according to claim 6, characterized in that, The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group are distributed at equal intervals in the third direction.

8. The display module according to claim 3, characterized in that, The first color detection light sensor group, the second color detection light sensor group, the third color detection light sensor group, the first correction light sensor group, and the second correction light sensor group all include multiple light-sensing transistors. Each light-sensing transistor includes a control terminal, a first terminal, and a second terminal. The control terminal is configured to be grounded, the first terminal is configured to be connected to a first voltage source, and the second terminal is a sensing result output terminal.

9. The display module according to claim 2, characterized in that, The cover plate includes a transparent cover plate body and an ink layer disposed on the edge of the transparent cover plate body. The area of ​​the transparent cover plate body without the ink layer forms the first light-transmitting area, and the area of ​​the transparent cover plate body with the ink layer forms the first light-shielding area.

10. The display module according to claim 2, characterized in that, The backlight module includes a frame and a light-shielding tape. The light-shielding tape is disposed on the side of the frame facing the display panel. The area of ​​the backlight module not blocked by the light-shielding tape forms the second light-transmitting area, and the area of ​​the backlight module where the light-shielding tape is disposed forms the second light-shielding area.

11. The display module according to claim 6, characterized in that, The display panel further includes a first polarizer disposed between the first substrate and the cover plate, and a second polarizer disposed between the second substrate and the backlight module. The display module further includes an optical adhesive layer disposed between the cover plate and the first polarizer, wherein: s1=T1 / tan(90°-β2) and n1*sinβ1=n2*sinβ2 (β1≥90°) s2 = T2 / tanα (α ≤ 45°) Where T1 represents the sum of the thicknesses of the first polarizer, the optical adhesive layer, and the first substrate; n1 represents the air refractive index; n2 represents the refractive index of the cover plate; β1 represents the incident angle of ambient light entering the cover plate; β2 represents the refraction angle of ambient light in the cover plate; T2 represents the sum of the thicknesses of the second polarizer and the second substrate; and α represents the incident angle of backlight on the second polarizer.

12. A display device, characterized in that, Includes the display module as described in any one of claims 1 to 11.

13. An ambient light detection method, applicable to a display module as described in any one of claims 1 to 11, characterized in that, The ambient light detection method includes: Acquire a first sensing result output by the detection light sensor group, a second sensing result output by the first correction light sensor group, and a third sensing result output by the second correction light sensor group, wherein the third sensing result is a temperature influence value; Calculate the backlight impact value based on the second sensing result and the third sensing result; The ambient light detection result is obtained by correcting the first sensing result based on the backlight influence value and the temperature influence value.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the ambient light detection method as described in claim 13.

Images