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

Abstract

The invention provides a display module, a display device, an ambient light detection method and a storage medium, the display module comprises a cover plate, a display panel and a backlight module which are sequentially arranged along a first direction, and a detection light sensing group, a first correction light sensing group and a second correction light sensing group are integrated in the display panel. Each of the detection light sensation group, the first correction light sensation group and the second correction light sensation group comprises at least one light sensation transistor, a light emitting side of the display module is a light transmitting area at a position corresponding to the detection light sensation group, and a light shielding area at a position corresponding to the first correction light sensation group and the second correction light sensation group; and the backlight side of the display module is a light-transmitting area at a position corresponding to the detection light sensation group and the first correction light sensation group, and is a light-shading area at a position corresponding to the second correction light sensation group.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and more specifically, to a display module, a display device, an ambient light detection method, and a storage medium. Background Art

[0002] In the related art, a display panel supporting a light sensing function integrates a photosensitive transistor, and the intensity of the ambient light is detected by a photosensitive transistor, such as a thin film transistor (TFT), so as to adjust the display brightness. When the ambient light shines on the photosensitive transistor, a current is generated when the photosensitive transistor is turned on. The greater the light intensity, the greater the current. Therefore, the intensity of the ambient light can be determined based on the current.

[0003] However, when the existing photosensitive transistor is working, its ambient light detection result is affected by temperature, backlight, etc., and the detection result has low accuracy. Summary of the invention

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

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] A first aspect of the present disclosure provides a display module, comprising a cover plate, a display panel and a backlight module arranged in sequence along a first direction, wherein a detection light sensing group, a first correction light sensing group and a second correction light sensing group are integrated in the display panel, wherein the detection light sensing group, the first correction light sensing group and the second correction light sensing group each include at least one photosensitive transistor, and the light emitting side of the display panel is a light-transmitting area at a position corresponding to the detection light sensing group, and is a light-shielding area at a position corresponding to the first correction light sensing group and the second correction light sensing group, and the backlight side of the display panel is a light-transmitting area at a position corresponding to the detection light sensing group and the first correction light sensing group, and is a light-shielding area at a position corresponding to the second correction light sensing group.

[0007] Optionally, the display panel includes a display area and a frame area surrounding the display area, the cover 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 the 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, and the display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked along the first direction. substrate, the detection 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 detection 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 shading area and the second shading area in the first plane both cover the orthographic projection of the second correction light sensing group in the first plane, the first substrate is provided with a color film layer at a position corresponding to the detection light sensing group, and a first black matrix layer at a position corresponding to the first correction light sensing group and the second correction light sensing group, and the first plane is a plane parallel to the display panel.

[0008] Optionally, the detection light sensing group includes at least a first color detection light sensing group, a second color detection light sensing group and a third color detection light sensing group, the color filter layer includes a first color color filter layer, a second color color filter layer and a third color color filter layer, and the first substrate is provided with the first color color filter layer at a position corresponding to the first color detection light sensing group, the second color color filter layer is provided at a position corresponding to the second color detection light sensing group, and the third color color filter layer is provided at a position corresponding to the third color detection light sensing 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 light sensing group, the first color filter layer is arranged on the same layer as the first color filter layer, the second color filter layer is arranged on the same layer as the second color filter layer, and the third color filter layer is arranged on the same layer as the third color filter layer.

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

[0011] Optionally, the border area includes a binding area and a non-binding area located on opposite sides of the display area in the second direction, the first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are all arranged on the same side as the non-binding area, and the first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are spaced apart along the 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 sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are equally spaced in the third direction.

[0013] Optionally, the first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group all include multiple photosensitive transistors, and the photosensitive transistors include a control end, a first end and a second end, the control end is configured to be grounded, the first end is configured to be connected to a first voltage source, and the second end is the sensing result output end.

[0014] Optionally, the cover includes a transparent cover body and an ink layer arranged at an edge of the transparent cover body, an area of ​​the transparent cover body where no ink layer is arranged forms the first light-transmitting area, and an area of ​​the transparent cover body where the ink layer is arranged forms the first light-shielding area.

[0015] Optionally, the backlight module includes a rubber frame and a light-shielding tape, the light-shielding tape is arranged on the side of the rubber 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 arranged forms the second light-shielding area.

[0016] Optionally, the distance S between the photosensitive transistor in the second correction photosensitive group and the display area in the second direction is: S=max(s1,s2)+a, wherein max(s1,s2) represents the maximum value of s1 and s2, a is a constant, s1 represents the critical distance between the photosensitive transistor and the inner boundary line of the first shading area in the second direction when the ambient light is blocked by the first shading area and cannot enter the photosensitive transistor in the second correction photosensitive group, and s2 represents the critical distance between the photosensitive transistor and the inner boundary line of the second shading area in the second direction when the backlight is blocked by the second shading area and cannot enter the photosensitive transistor in the second correction photosensitive 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, and 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] Wherein, T1 represents the sum of the thicknesses of the first polarizer, the optical adhesive layer and the first substrate, n1 represents the refractive index of air, 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 the present disclosure provides a display device, comprising the display module as described above.

[0022] A third aspect of the present disclosure provides an ambient light detection method, which is applicable to the display module as described above. The ambient light detection method includes:

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

[0024] Calculating a backlight impact value according to the second sensing result and the third sensing result;

[0025] The first sensing result is corrected according to the backlight impact value and the temperature impact value to obtain an ambient light detection result.

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

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

[0028] The display module of the embodiment of the present disclosure, by additionally adding a second correction light sensing group, and setting the light-emitting side and the backlight side of the display module as shading areas at the position of the second correction light sensing group, can achieve that the detection result of the second correction light sensing group is only affected by temperature. At the same time, the light-emitting side of the display module is set as a shading area at the position of the first correction light sensing group, and the backlight side is set as a transparent area at the position of the first correction light sensing group, so that the detection result of the first correction light sensing group is only affected by backlight and temperature. The detection results of the first correction light sensing and the second correction light sensing group can be processed to obtain an influence value only related to the backlight. With such a setting, on the one hand, the detection result of the detection light sensing can be used to perform real-time temperature compensation on the detection result of the detection light sensing. On the other hand, the detection results of the first correction light sensing group and the second correction light sensing group can be used to calculate a real-time backlight influence value, and then the backlight influence value can be used to perform real-time backlight compensation on the detection result of the detection light sensing group. That is, the present disclosure can perform real-time backlight correction and real-time temperature correction on the detection result of the detection light sensing group, obtain a detection result only related to the ambient light intensity, and improve the accuracy of the ambient light detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The specific implementation methods of the present disclosure are further described in detail below with reference to the accompanying drawings.

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

[0031] Figure 2 for Figure 1 The side view of the module along the B-B' direction is shown in the figure;

[0032] Figure 3 for Figure 1 The side view of the module along the C-C' direction is shown in the figure;

[0033] Figure 4 for Figure 1 Front view of the local area Q1;

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

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

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

[0037] Figure 8 A partial plan view of a display module is provided for an embodiment of the present disclosure;

[0038] Fig. 9 For display module along Figure 8 Side view along the middle section line D-D';

[0039] Fig.10 For display module along Figure 8 Side view along the middle section line E-E';

[0040] Fig.11 for Fig. 9 A partial enlarged view of the middle area Q2;

[0041] Fig.12 It is a schematic diagram of the transmittance bands of the color filter layers R-CF2, G-CF2, and B-CF2 to visible light obtained by actual measurement;

[0042] Fig.13 It is a structural schematic diagram of another embodiment of the display module disclosed in the present invention;

[0043] Fig.14 is a schematic diagram of the film structure of any photosensitive transistor;

[0044] Fig.15 It 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] Fig.16 A schematic diagram of the light path of the ambient light incident on the second calibration light sensing group D2;

[0046] Fig.17 is a curve showing the relationship between the leakage current and the ambient light of the second calibration light sensing group D2 at a fixed temperature;

[0047] Fig.18 is a schematic diagram of the light path of the backlight incident on the second calibration light sensing group D2;

[0048] Fig.19 Schematic diagram of the light intensity distribution of the backlight in various viewing angles;

[0049] Fig. 20 is a curve showing the relationship between the leakage current of the photosensitive transistor in the second calibrated photosensitive group D2 and the backlight;

[0050] Fig.21 A size design structure diagram of a photosensitive transistor in a photosensitive group provided in an embodiment of the present disclosure;

[0051] Fig. 22 A flowchart of an ambient light detection method provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0053] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] In the related art, display modules supporting light sensing functions are as follows 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 side view of the module along the B-B' direction is shown in FIG. Figure 3 for Figure 1 The side view of the module along the C-C' direction is shown in the figure. Figure 4 for Figure 1 The front view of the local area Q1 in is as follows: Figures 1 to 4As shown, the display module includes a glass cover (Cover Glass, CG) 610, an optically clear adhesive (Optically Clear Adhesive, OCA) 620, an upper polarizer (Polarizer, POL) 630, a color filter substrate 640, a liquid crystal layer 650, an array substrate 660, a lower polarizer 670 and a backlight module (Back Light Unit, BLU) 680 stacked in sequence from top to bottom, wherein a black ink layer 610a is arranged in the surrounding edge areas of the glass cover 610, a light-shielding glue 680a is arranged in the surrounding edge areas of the backlight module 680, and the color filter substrate 640 is covered with a black matrix layer BM in the frame area. The light sensing function is set in the upper frame area of ​​the display module. Specifically, there are four groups of light sensing transistors TFT in the upper frame area, which are represented by red group R, green group G, blue group B, and black group D, respectively. The red group R indicates that the black matrix layer BM above the light sensing transistor is hollowed out and filled with red color film R-CF, the green group G indicates that the black matrix layer BM above the light sensing transistor is hollowed out and filled with green color film G-CF, the blue group B indicates that the black matrix layer BM above the light sensing transistor is hollowed out and filled with blue color film B-CF, and the black group D indicates that the black matrix layer BM above the light sensing transistor is not hollowed out. In the Y direction of the display module, these four groups of light sensing transistors are located between the AA boundary line and the CG-VA boundary line, wherein the AA boundary line represents the outer boundary line of the display area of ​​the display panel, and the CG-VA represents the outer boundary line of the light-transmitting area on the glass cover plate, which can also be understood as the inner boundary line of the light-shielding area, that is, the inner boundary line of the ink layer, so that the ink layer on the glass cover plate will not block the light sensing transistor from receiving external ambient light.

[0055] When performing ambient light detection, the external ambient light shines on the three photosensitive groups R, G, and B. The photosensitive transistor in the red group R receives the red light of this light source. Similarly, the photosensitive transistors in the green group G and the blue group B receive the green light and blue light of this light source respectively. Since any photosensitive transistor is in the off state (that is, the gate Gate is not powered) and the source Source is supplied with a certain voltage, its drain Drain will generate a certain leakage current I d , by measuring the leakage current I d The intensity of the ambient light can be obtained. However, although the leakage current I of the photosensitive transistor can be measured d, but it is also necessary to pre-calibrate the corresponding relationship between ambient light intensity and leakage current in order to determine the ambient light intensity through leakage current. Specifically, it is necessary to collect leakage current values ​​under different light intensities under a certain light source in advance, and generate a relationship curve between light intensity and leakage current under different intensities of this light source. However, in the actual use of the display module, there are many types of external ambient light, and the proportions of red light, green light and blue light in different types of ambient light are different, that is, the current external ambient light and the proportion of each color light in the light source corresponding to the pre-generated relationship curve are different. Therefore, it is also necessary to correct the current external ambient light and correct it to the light source of the pre-generated light intensity and leakage current relationship curve.

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

[0057] Step (1.1) collects leakage current values ​​corresponding to different light intensities of a certain light source (assuming it is light source L1) in advance, and generates a relationship curve between the light intensity of this light source and the leakage current.

[0058] Step (1.2) collects the leakage current values ​​of the red group R photosensitive transistor and the blue group B photosensitive transistor for different light sources in advance, so that for the current external ambient light, the light source type of the current external ambient light can be determined by the collected leakage currents of the red group R photosensitive transistor and the blue group B photosensitive transistor.

[0059] Step (1.3) collects the leakage current values ​​of the green group G photosensitive transistors of different light sources in advance, so that the light source used by the different light sources and the pre-generated relationship curve (ie, light source L1) can generate a light intensity coefficient of the different light sources.

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

[0061] However, the inventors found that the above pre-collection process is performed at a fixed ambient temperature, and in fact, the leakage current I d In addition to being affected by ambient light, it is also affected by backlight illumination and ambient temperature. Therefore, it is necessary to remove the influence of ambient temperature and backlight illumination on the photosensitive transistor, leaving only the influence of ambient light intensity in the environment to truly reflect the intensity of external ambient light. For this reason, the black group D is designed. The function of the black group D is to use the black matrix layer BM to block the external ambient light, so as to prevent the external ambient light from irradiating the photosensitive transistor of the black group D, so that the photosensitive transistor of the black group D is not affected by the external ambient light, but only by the ambient temperature and backlight illumination. In this way, the leakage current I dSubtract the leakage current I of the black group D d In theory, the influence of ambient temperature and backlight on the photosensitive transistors is completely avoided. That is, the role of the photosensitive transistor in the black group D is essentially a correction parameter to remove the influence of ambient temperature and backlight, which can ensure that the photosensitive transistors in the photosensitive groups R, G, and B are only affected by the ambient light intensity.

[0062] When the above four light sensing groups are used to detect ambient light, the specific process is as follows:

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

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

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

[0066] Problem (1) Black group D cannot perform temperature compensation calibration on the three photosensitive groups R, G, and B in real time: When the display module is in normal use, black group D is affected by both ambient temperature and backlight illumination. Therefore, temperature compensation can only be performed when the display module turns on the screen (that is, after PNL is turned on and before the backlight is turned on). That is, the measurement value of 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, 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: The black matrix layer BM in the display panel is affected by the material properties and cannot completely block the ambient light. As a result, when the display module is performing temperature compensation at the instant the screen is turned on, the black group D photosensitive transistor is not only affected by the ambient temperature, but also by part of the ambient light. 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: The black matrix layer BM in the display panel is affected by the material properties and cannot completely block the external ambient light. During normal use of the display module, the black group D will be affected by the external ambient light, temperature, and backlight. Therefore, the difference between the measured values ​​of the black group D at the moment of power-on and during normal display is used as the backlight compensation value to provide the three groups of R, G, and B photosensitive transistors for backlight compensation. This is inaccurate (affected by real-time temperature and real-time ambient light), that is, it is impossible to accurately provide backlight compensation for the three photosensitive groups R, G, and B.

[0069] The relationship curve between the leakage current of the black group D photosensitive transistor and the backlight intensity is as follows: 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 for different backlight intensities. The backlight intensity can be represented by the backlight current, which means that the backlight intensity will affect the detection result of the photosensitive transistor. The relationship curve between the leakage current and the ambient light intensity of the black group D photosensitive transistor is as follows: Figure 6 As shown, Figure 6 The temperature of each group of data is the same, that is, when the temperature is fixed, the ambient light intensity will also affect the leakage current. The relationship curve between the leakage current and the ambient temperature of the black group D photosensitive transistor is as follows Figure 7 shown.

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

[0071] In order to solve the above technical problems, the present 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 A partial plan view of a display module provided in an embodiment of the present disclosure, Fig. 9 For display module along Figure 8 Side view along the middle section line D-D', Fig.10 For display module along Figure 8 The side view along the middle section line E-E' is as follows: Figures 8 to 10As shown, the display module includes a cover plate 10, a display panel 20 and a backlight module 30 which are sequentially arranged along a first direction, the display panel 20 integrates a detection light sensing group, a first correction light sensing group D1 and a second correction light sensing group D2, the detection light sensing group, the first correction light sensing group D1 and the second correction light sensing group D2 each include at least one photosensitive transistor, the light emitting side of the display panel 20 is a light-transmitting area at the corresponding position of the detection light sensing group, and is a light-shielding area at the corresponding position of the first correction light sensing group D1 and the second correction light sensing group D2, the backlight side of the display panel 20 is a light-transmitting area at the corresponding positions of the detection light sensing group and the first correction light sensing group D1, and is a light-shielding area at the corresponding position of the second correction light sensing group D2.

[0073] The first direction in the disclosed embodiment is the thickness direction of the display module, that is, the direction perpendicular to the plane of the display module. Exemplarily, the first direction is recorded as the Z direction. The light-emitting side of the display panel is the side for display, 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 provided with the cover plate 10 is the light-emitting side, and the side provided with the backlight module 30 is the backlight side.

[0074] Among them, the detection photosensitive group is equivalent to the three photosensitive groups R, G, and B in the related art, which are used for real-time ambient light detection. Among them, the light-emitting side and the backlight side of the display module are both light-transmitting areas at the corresponding positions of the detection photosensitive group, which are used to indicate that: ambient light can be incident on the photosensitive transistor of the detection photosensitive group from the light-emitting side, and the backlight can be incident on the photosensitive transistor of the detection photosensitive group from the backlight side, that is, the detection result of the detection photosensitive group is affected by ambient temperature, backlight illumination and ambient light at the same time. Specifically, the light-emitting side and the backlight side of the display module are both light-transmitting areas at the corresponding positions of the detection photosensitive group, which can also be understood as: the positive projection of the light-transmitting area of ​​the light-emitting side of the display module in the first plane at least covers the positive projection of the photosensitive transistor in the detection photosensitive group in the first plane, and similarly, the positive projection of the light-transmitting area of ​​the backlight side of the display module in the first plane at least covers the positive projection of the photosensitive transistor in the detection photosensitive group in the first plane, and the first plane is a plane parallel to the display panel 20, that is, a plane perpendicular to the first direction Z.

[0075] The first correction light sensing group D1 is equivalent to the black group D in the related art. The light-emitting side of the display module is a shading area at the corresponding position of the first correction light sensing group D1, and the backlight side is a light-transmitting area at the corresponding position of the first correction light sensing group D1, which is used to indicate that: ambient light cannot be incident on the photosensitive transistor of the first correction light sensing group D1 from the light-emitting side, while backlight can be incident on the photosensitive transistor of the first correction light sensing group D1 from the backlight side, that is, the detection result of the first correction light sensing group D1 is affected by both ambient temperature and backlight illumination; it can also be understood as: the orthographic projection of the shading area on 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 correction light sensing group D1 in the first plane. Similarly, the orthographic projection of the light-transmitting area on the backlight side of the display module in the first plane at least covers the orthographic projection of the photosensitive transistor in the first correction light sensing group D1 in the first plane.

[0076] Compared with the related art, the second correction light sensing group D2 is a newly added light sensing group. The light-emitting side and the backlight side of the display module are both shading areas at the corresponding positions of the second correction light sensing group D2, which are used to indicate that: ambient light cannot be incident on the photosensitive transistor of the second correction light sensing group D2 from the light-emitting side, and backlight cannot be incident on the photosensitive transistor of the second correction light sensing group D2 from the backlight side, that is, the detection result of the second correction light sensing group D2 is not affected by ambient light and backlight illumination, but only by temperature; it can also be understood that: the orthographic projection of the shading area on the light-emitting side of the display module in the first plane at least covers the orthographic projection of the photosensitive transistor in the second correction light sensing group D2 in the first plane, and similarly, the orthographic projection of the shading area on the backlight side of the display module in the first plane at least covers the orthographic projection of the photosensitive transistor in the second correction light sensing group D2 in the first plane.

[0077] Assuming that the sensing result of the detected light sensing group is represented as the first sensing result Y1, the sensing result of the first corrected light sensing group D1 is represented as the second sensing result Y2, and the sensing result of the second corrected light sensing group D2 is represented as the third sensing result Y3, the third sensing result Y3 can represent the ambient temperature compensation value, and the difference between the third sensing result Y3 and the second sensing result Y2 can represent the backlight compensation value. The first sensing result Y1 can be corrected or compensated using the ambient temperature compensation value and the backlight compensation value to obtain the true ambient light detection result.

[0078] Compared with the related art, the display module of the embodiment of the present disclosure, by additionally adding a second correction light sensing group, and setting the light-emitting side and the backlight side of the display module at the position of the second correction light sensing group to be shading areas, can achieve that the detection result of the second correction light sensing group is only affected by temperature, and at the same time, setting the light-emitting side of the display module at the position of the first correction light sensing group to be a shading area, and the backlight side at the position of the first correction light sensing group to be a light-transmitting area, can achieve that the detection result of the first correction light sensing group is only affected by backlight and temperature, and processing the detection results of the first correction light sensing and the second correction light sensing groups can obtain only The influence value related to the backlight is set in this way. On the one hand, the detection result of the second correction light sensing group can be used to perform real-time temperature compensation on the detection result of the detection light sensing. On the other hand, the detection results of the first correction light sensing group and the second correction light sensing group can be used to calculate the real-time backlight influence value, and then the backlight influence value can be used to perform real-time backlight compensation on the detection result of the detection light sensing group. That is, the present invention can perform real-time backlight correction and real-time temperature correction on the detection result of the detection light sensing group, and obtain a detection result that is only related to the ambient light intensity, thereby improving the accuracy of the ambient light detection result.

[0079] In one possible implementation, Figure 8 and Fig. 9 The display panel 20 includes a display area and a frame 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 the 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, and 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 The detection light sensing group, the first correction light sensing group D1 and the second correction light sensing group D2 are integrated on the second substrate 230, the orthographic projections of the detection light sensing group and the first correction light sensing group D1 in the first plane are located in the projection area where the second projection exceeds the first projection, the orthographic projections of the first shading area and the second shading area in the first plane both cover the orthographic projection of the second correction light sensing group D2 in the first plane, the first substrate 210 is provided with a color film layer CF1 at a position corresponding to the detection light sensing group, and a first black matrix layer BM1 at a position corresponding to the first correction light sensing group D1 and the second correction light sensing group D2, and the first plane is a plane parallel to the display panel 20.

[0080] In the embodiment of the present disclosure, 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 the first plane, wherein the first plane is a plane parallel to the display panel 20, i.e., a plane perpendicular to the first direction Z, i.e., a plane parallel to the second direction Y and the third direction X.

[0081] like Figure 8 and Fig. 9 As shown, the second projection covers the first projection and exceeds the first projection, which can be understood as: 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 covers the second projection, which includes two situations. The first is that the third projection completely overlaps the second projection, in which case it can also be understood that the second light-transmitting area corresponds to the first light-transmitting area and has the same size. The second is that the third projection covers the second projection and the third projection exceeds the second projection, in which case it can also be understood that the second light-transmitting area corresponds to the first light-transmitting area, and the size of the second light-transmitting area is larger than the size of the first light-transmitting area.

[0082] Optional, such as Fig. 9 and Fig.10 As shown, the cover 10 includes a transparent cover body 110 and an ink layer 120 arranged at the edge of the transparent cover body 110, the area of ​​the transparent cover body 110 where the ink layer 120 is not arranged forms the first light-transmitting area, and the area of ​​the transparent cover body 110 where the ink layer 120 is arranged forms the first light-shielding area.

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

[0084] The ink layer 120 is disposed in the edge area of ​​the transparent cover body 110, and is usually a black ink layer that can block light transmission. Therefore, the area where the ink layer 120 is disposed can form a light-shielding area, that is, a first light-shielding area. Assuming that the inner boundary line of the ink layer 120 in the cover 10 is represented by CG-VA, the area surrounded by CG-VA is the first light-transmitting area, and assuming that the outer boundary line of the display area is represented by AA, CG-VA is disposed around AA.

[0085] Optional, such as Fig. 9 and Fig.10As shown, the backlight module 30 includes a plastic frame 310 and a light-shielding tape 320. The light-shielding tape 320 is arranged on the side of the plastic frame 310 facing the display panel 20. The area of ​​the backlight module 30 that is 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 set forms the second light-shielding area.

[0086] In addition, the backlight module 30 further includes an optical film material, a light guide plate and a back plate stacked in sequence in a direction away from the display panel 20. The optical film layer includes but is not limited to structures such as upper and lower prisms and a diffusion plate. Fig. 9 In the figure, structures such as the optical film material, the light guide plate and the back plate are uniformly marked as 330, wherein the plastic frame 310 is arranged on the outer peripheral side of the light guide plate, the light-shielding tape 320 is arranged on the side of the plastic frame 310 facing the display panel 20, and the light-shielding tape 320 extends along the direction of the optical film material and exceeds the edge of the plastic frame 310, that is, a part of the light-shielding tape 320 is covered in the upper edge area of ​​the optical film material.

[0087] Assuming that the inner boundary line of the shading tape 320 in the backlight module 30 is represented by BLU-VA, the inner area surrounded by BLU-VA is the second light-transmitting area, wherein BLU-VA can overlap with CG-VA, or can be arranged on the outer side of CG-VA, that is, BLU-VA is arranged around CG-VA, that is, BLU-VA is farther away from the boundary line AA of the display area than CG-VA.

[0088] In the disclosed embodiment, 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] Exemplarily, the first substrate 210 is a color filter substrate, and the second substrate 230 is an array substrate. In this case, the first substrate 210 is close to the cover plate 10 , and the second substrate 230 is close to the backlight module 30 .

[0090] Exemplarily, the first substrate 210 is an array substrate, and the second substrate 230 is a color filter substrate. In this case, the second substrate 230 is close to the cover plate 10 , and the first substrate 210 is close to the backlight module.

[0091] The various embodiments of the present disclosure are described by taking the first substrate 210 as a color filter substrate and the second substrate 230 as an array substrate as an example, wherein each photosensitive transistor in the detection photosensitive group, the first correction photosensitive group D1 and the second correction photosensitive group D2 are all integrated on the array substrate, that is, on the second substrate 230.

[0092] In addition, if Fig. 9As shown, the display panel 20 also 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 also includes an optical adhesive layer 40 disposed between the cover plate 10 and the first polarizer 240.

[0093] In order to realize that the light-emitting side and the backlight side of the display module are light-transmitting areas or light-shielding areas at the positions of the detection light sensing group, the first correction light sensing group D1 and the second correction light sensing group D2, it is necessary to set the positions of the detection light sensing group, the first correction light sensing group D1 and the second correction light sensing group D2.

[0094] Specifically, the orthographic projections of the detection light sensing group and the first correction light sensing group D1 in the first plane are located within the projection area where the second projection exceeds the first projection, and the first substrate 210 is provided with a color filter layer CF1 at a position corresponding to the detection light sensing group and a first black matrix layer BM1 at a position corresponding to the first correction light sensing group D1, which can achieve:

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

[0096] (2) The photosensitive transistor 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 shading area at the position corresponding to the first correction photosensitive group D1, and the ambient light cannot be sensed by the photosensitive transistor in the first correction photosensitive group D1; the backlight side is not covered by the shading tape 320, that is, the backlight side is a light-transmitting area at the position corresponding to the first correction photosensitive group D1, and the backlight can be sensed by the photosensitive transistor in the first correction photosensitive group D1.

[0097] Specifically, 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 D2 in the first plane, which can achieve:

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

[0099] In the related art, the border area is covered with the first black matrix layer BM1. In order to realize that on the light-emitting side, the position of the detection light sensing group is a light-transmitting area, and the positions of the first correction light sensing group D1 and the second correction light sensing group D2 are light-shielding areas, the embodiment of the present disclosure needs to hollow out the first black matrix layer BM1 at the position of the detection light sensing group and cover the color film layer CF1, while the first black matrix layer BM1 at the position of the first correction light sensing group D1 and the second correction light sensing group D2 is not processed, that is, the first black matrix layer BM1 at the position of the first correction light sensing group D1 and the second correction light sensing group D2 is retained. Therefore, the second correction light sensing group D2 will be blocked by the first black matrix layer BM1 and the ink layer 120 at the same time, achieving a better light-proof effect and preventing ambient light from irradiating the second correction light sensing group D2.

[0100] In a possible implementation, the detection light sensing group includes at least a first color detection light sensing group, a second color detection light sensing group and a third color detection light sensing group, the color filter layer includes a first color color filter layer, a second color color filter layer and a third color color filter layer, and the first substrate is provided with the first color color filter layer at a position corresponding to the first color detection light sensing group, the second color color filter layer is provided at a position corresponding to the second color detection light sensing group, and the third color color filter layer is provided at a position corresponding to the third color detection light sensing group.

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

[0102] In a possible implementation, the first substrate is further provided with a stacked first color filter layer, a second color filter layer and a third color filter layer at a position corresponding to the first correction light sensing group, the first color filter layer is arranged on the same layer as the first color filter layer, the second color filter layer is arranged on the same layer as the second color filter layer, and the third color filter layer is arranged on the same layer as the third color filter layer.

[0103] Please refer to Fig.11 , Fig.11 for Fig. 9 A partial enlarged view of the middle area Q2, as shown in Fig.11 As shown, in the embodiment of the present disclosure, in addition to the first black matrix layer BM1, 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 are also provided above the first correction light sensing group D1. 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 of blue, green and red, the wavelength of blue light is 380nm~500nm, the wavelength of green light is 490nm~600nm, and the wavelength of red light is 600nm~760nm, even if the blue light and green light overlap, the overlapping bands will not pass through the red color film, and even if the green light and red light have overlapping bands, the overlapping bands will not pass through the blue color film. For example, please refer to Fig.12 , Fig.12This is a schematic diagram of the transmittance bands of the color filter layers R-CF2, G-CF2, and B-CF2 for visible light obtained by actual measurement, wherein different colors represent the bands of visible light transmitted by different color filter layers. Therefore, visible ambient light will not pass through the color film in which the blue, green, and red color filters are superimposed on each other, that is, 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, and light will not pass through the black blocking layer, which can further improve the opacity of the first correction light sensing group D1 and prevent ambient light from irradiating the first correction light sensing group D1.

[0105] In summary, when the first correction light sensing group D1 is covered with 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 ensure that the first correction light sensing group D1 is completely unaffected by the external ambient light. During the normal use of the display module with the screen on, the measured value of the first correction light sensing group D1 minus the measured value of the second correction light sensing group D2 can be understood as the real-time backlight illumination impact value, that is, the backlight illumination compensation value.

[0106] In the embodiments of the present disclosure, unless otherwise specified, the term "same-layer arrangement" used means that two layers, parts, components, elements or parts can be formed by the same preparation process (such as patterning process, etc.), and the two layers, parts, components, elements or parts are generally formed of the same material. For example, two or more functional layers are arranged in the same layer, which means that these functional layers arranged in the same layer can be formed using the same material layer and the same preparation process, thereby simplifying the preparation process and cost of the display substrate.

[0107] Exemplarily, the first color filter layer R-CF2 is arranged on the same layer as the first color filter layer R-CF1, which means that the first color filter layer R-CF2 is synchronously formed above the first correction light sensing group D1 in the process of the first color filter layer R-CF1, so there is no need to add additional processes and costs.

[0108] It is understandable that the embodiment of the present disclosure does 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 is determined according to the process sequence 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, Fig.11In the illustrated embodiment, 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 preparation process sequence of the color filter substrate 210 is as follows: color filter substrate → making 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, and 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) → making a blue color filter (coating a blue color film above the photosensitive transistors of the photosensitive group B1 and D1) → making a green color filter (coating a green color film above the photosensitive transistors of the photosensitive group G1 and D1) → making a red color filter (coating a red R color film above the photosensitive transistors of the photosensitive group R1 and D1), so that the color filter substrate directly above the photosensitive transistor D1 is four layers from top to top: BM1, B-CF2, G-CF2, R-CF2. For example, the size of B-CF2 may be 1020*25*2.67 μm, the size of G-CF2 may be 1020*25*2.79 μm, and the size of R-CF2 may be 1020*25*2.98 μm.

[0109] In a possible implementation manner, a second black matrix layer is further disposed on the first substrate at a position corresponding to the first correction light sensing group.

[0110] For example, please refer to Fig.13 , Fig.13 It is a structural schematic diagram of another embodiment of the display module. In the disclosed embodiment, in addition to the first black matrix layer BM1, a second black matrix layer BM2 is also provided above the first correction light sensing group D1. In this way, there are two black matrix layers above the first correction light sensing group D1, which can further improve the light-proof performance of the first correction light sensing group D1, avoid ambient light from irradiating the first correction light sensing group D1, and ensure that the first correction light sensing group D1 is not affected by external ambient light. During normal bright-screen use of the display module, the measured value of the first correction light sensing group D1 minus the measured value of the second correction light sensing group D2 is the real-time backlight illumination impact value, that is, the backlight illumination compensation value.

[0111] In a possible implementation, the border area includes a binding area and a non-binding area located on opposite sides of the display area in the second direction, and the first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are all arranged on the same side as the non-binding area, and the first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are spaced apart along a third direction, and the third direction is perpendicular to the second direction.

[0112] like Figure 1 and Figure 8 As shown, the frame area of ​​the display panel 20 includes a binding area. Exemplarily, the binding area is located in the lower frame area of ​​the display area, and each light sensing group is arranged in the non-binding area on the other side opposite to the binding area, that is, in the upper frame area of ​​the display panel 20. In addition, each light sensing group R1, G1, B1, D1 and D2 is arranged at intervals along the third direction X in the upper frame area.

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

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

[0115] Optionally, the first color detection light sensing group R1, the second color detection light sensing group G1, the third color detection light sensing group B1, the first correction light sensing group D1 and the second correction light sensing group D2 all include multiple photosensitive transistors, and the photosensitive transistors include a control end, a first end and a second end. The control end is configured to be grounded, the first end is configured to be connected to a first voltage source, and the second end is a sensing result output end.

[0116] Please refer to Fig.14 , Fig.14 is a schematic diagram of the film structure of any photosensitive transistor, such as Fig.14As shown, any photosensitive transistor includes a gate (Gate) formed on the second substrate 230, a gate insulating layer (Gate Insulator, GI) covering the gate, an active layer (ACT) formed on the gate insulating layer, a source-drain electrode layer (SD) formed above the active layer, the source-drain electrode layer (SD) including a source electrode (Source) and a drain electrode (Drain), and a passivation layer (PVX) covering the source-drain electrode layer (SD). It can be understood that the structure of the photosensitive transistor can also adopt other existing structures, and the embodiment of the present disclosure does not improve the specific structure of the photosensitive transistor.

[0117] The control end of the photosensitive transistor is a gate, the first end is a source, and the second end is a drain.

[0118] Each photosensitive group includes a plurality of photosensitive transistors, for example, Fig.15 As shown, each photosensitive group includes three photosensitive transistors. Each photosensitive group is provided with multiple photosensitive transistors, which can improve the detection accuracy of light intensity in a certain scene and reduce the detection error.

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

[0120] During operation, no voltage is applied to the first signal lines g1-g2, that is, no voltage is applied to the gate of each photosensitive transistor, that is, the gate of each photosensitive transistor is grounded, and the second signal lines s1-s2 input the first voltage source, that is, a certain voltage is applied to the source of each photosensitive transistor, and 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 the size of

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

[0122] Please refer to Fig. 9 and Fig.16 , Fig.16 is a schematic diagram of ambient light incident on the second calibration light sensing group D2, as shown in Fig.16 As shown, assuming that the photosensitive transistor in the second correction photosensitive group D2 is recorded as TFT2, in order to prevent ambient light from being incident on the photosensitive transistor TFT2, the position of the photosensitive transistor TFT2 needs to be specifically designed. Specifically, the ambient light is irradiated onto the cover plate 10 and refracted at the cover plate 10. In order to ensure that the ambient light cannot be incident on the photosensitive transistor TFT2, it is necessary to ensure that the ambient light of any large viewing angle in the display area on the light-emitting side cannot be incident on the photosensitive transistor TFT2. Assuming that the incident angle of the ambient light at the cover plate 10 is β1, as long as β1 ≥ 90°, the ambient light cannot be incident on the photosensitive transistor TFT2.

[0123] For ambient light, the refractive index formula is: n1*sinβ1=n2*sinβ2, wherein n1 represents the refractive index of air, n2 represents the refractive index of the cover plate, and β2 represents the refraction angle of the ambient light in the cover plate 10. Usually, the refractive index n1 of air is 1, and the refractive index n2 of the glass cover plate is 1.5. According to n1*sinβ1=n2*sinβ2 (β1≥90°), sinβ2≥0.67, that is, β2≤42°. And the relationship between the refraction angle β2 and the critical distance s1 and the thickness and T1 is: s1 = T1 / tan (90°-β2), wherein 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 between the photosensitive transistor TFT2 and the inner boundary line of the first shading area (i.e., CG-VA) in the second direction Y when the ambient light is blocked by the first shading area (i.e., the ink layer 120) and cannot be incident on the photosensitive transistor TFT2. The critical distance s1 is also the minimum distance value, i.e., the distance between the photosensitive transistor TFT2 and the inner boundary line of the first shading area when the ambient light just irradiates the edge of the photosensitive transistor TFT2. It should be noted that although a liquid crystal layer 220 is also provided between the first substrate 210 and the photosensitive transistor TFT2, since the thickness of the liquid crystal layer 220 is very thin, it is not in the same order of magnitude as the thickness of other film layers, so the thickness of the liquid crystal layer 230 is ignored in the embodiment of the present disclosure.

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

[0125] Please refer to Fig.17 , Fig.17 is a curve showing the relationship between the leakage current of the light sensing transistor in the second calibrated light sensing group D2 and the ambient light, wherein the horizontal axis represents the ambient light intensity in lux, and the vertical axis represents the leakage current I d The size of the Fig.17 #1, #2, and #3 represent three different sample display modules. Fig.17 It can be seen that when the temperature and backlight are fixed, the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 is d When the ambient light intensity changes, it remains basically unchanged, that is, it is basically not affected by the ambient light intensity, and at different temperatures, the leakage current I d The sizes are different.

[0126] Similarly, on the backlight side, it is necessary to ensure that the backlight cannot shine on the photosensitive transistor TFT2 as much as possible. Please refer to Fig. 9 and Fig.18 , Fig.18 is a schematic diagram of backlight incident on the second calibration light sensing group D2, wherein the light intensity distribution of the light emitted by the backlight source within each viewing angle range is as follows: Fig.19 As shown, 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 source is concentrated in the viewing angle range of (-45°, +45°). The backlight brightness exceeding (-45°, +45°) is very small and can be completely blocked by the Gate metal shading layer under the photosensitive transistor TFT2 (that is, close to the backlight side). Therefore, the main consideration is that the backlight within the viewing angle range of (-45°, +45°) cannot directly hit the photosensitive transistor TFT2.

[0127] Among them, the relationship between the backlight incident angle α and the critical distance s2 and the thickness and T2 satisfies s2=T2 / tanα (α≤45°), wherein 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, s2 represents the critical distance between the photosensitive transistor TFT2 and the inner boundary line of the second shading area (that is, BLU-VA) in the second direction Y when the backlight is blocked by the second shading area and cannot be incident on the photosensitive transistor TFT2 in the second correction photosensitive group D2, and the critical distance s2 is also the minimum distance value, that is, the distance between the photosensitive transistor TFT2 and the inner boundary line of the second shading area when the 45° backlight just irradiates the edge of the photosensitive transistor TFT2.

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

[0129] Optionally, when designing s2, the assembly tolerance of the backlight module 30 may be further considered, that is, the second light shielding area may be able to block the backlight from irradiating the photosensitive transistor TFT2 while considering the assembly tolerance of the backlight module 30. The backlight assembly tolerance may be expressed as sqrt(m1^2+m2^2+m3^2+m4^2+m5^2), wherein m1 represents the single-side tolerance of the backlight module shape, m2 represents the distance tolerance between 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), at which time s1=T2 / tan(45°)+sqrt(0.06^2+0.12^2+0.1^2)=0.351mm.

[0130] Please refer to Fig. 20 , Fig. 20 is a curve showing the relationship between the leakage current of the light-sensing transistor in the second corrected light-sensing group D2 and the backlight and ambient light, wherein the abscissa represents the backlight intensity in lux, and the ordinate represents the leakage current I d The size of Fig. 20 It can be seen that the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 d When the backlight intensity changes, it remains basically unchanged, that is, it is basically not affected by the backlight intensity, and the leakage current I of the photosensitive transistor in the second correction photosensitive group D2 d It remains basically unchanged when the ambient light intensity changes, and is basically not affected by the ambient light intensity.

[0131] In addition, 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 usually 0.2 mm, which is the constant a shown above. Therefore, the distance between the edge of the photosensitive transistor TFT2 close to the display area and the display area can be expressed as S=max(s1, s2)+a.

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

[0133] Optionally, in the implementation of the present disclosure, the size of the photosensitive transistors in each photosensitive group is designed as follows: Fig.21As shown, dx = 980 μm, dy = 15 μm, d2 = 20 μm, d1 = 10 μm, f = 5 μm, c1 = 60 μm, g = 1000 μm, e = 0.9-1.1 mm, 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 the two color filter layers on the photosensitive transistor, e represents the upper frame distance of the display module, d1 represents the width of the color filter layer exceeding the photosensitive transistor in the second direction Y, c1 represents the distance between the color filter layer above the photosensitive transistor and the display area in the second direction Y, and S represents the distance between the lower edge (that is, the edge close to the display area) of the photosensitive transistor TFT2 in the second correction photosensitive group D2 and the display area. It can be understood that the size of the photosensitive transistors in each photosensitive group in the embodiment of the present disclosure is the same, 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 the width of the upper frame of the display module to increase. Specifically, the width of each group of photosensitive transistors in the second direction Y is 15μm. At this time, the distance between the upper side of the photosensitive transistor TFT2 and the upper edge of the display module (that is, the PNL boundary line) is eS-15μm. When the upper frame e=1mm, the distance between the upper side of the photosensitive transistor TFT2 and the upper edge of the display module is 1mm-0.551mm-0.015mm=0.434mm, that is, there is 0.434mm of space for placing the COM layer and the GND wiring, so it will not cause the upper frame of the display module to increase. On the other hand, in the display module of the embodiment of the present disclosure, the ink layer 120 on the cover plate 10 will not block the detection photosensitive group from receiving external ambient light, and will not change the existing design of the backlight module 30, so it is simple to implement.

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

[0136] Exemplarily, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc., which is not limited in this embodiment.

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

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

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

[0140] Step S20: calculating a backlight impact value according to the second sensing result and the third sensing result.

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

[0142] Compared with the related art, the sensing result of the second correction light sensing group in the embodiment of the present disclosure is only related to temperature, so the third sensing result can be used to compensate for the influence of ambient temperature on the first sensing result, and the third sensing result can also perform real-time temperature compensation when the display module is used normally with the screen on. The sensing result of the first correction light sensing group is only related to temperature and backlight, so the third sensing result minus the second sensing result is the real-time backlight impact value, which can be used to compensate for the influence of backlight on the first sensing result, and then obtain the real ambient light intensity.

[0143] Based on the same inventive concept, the fourth aspect of the present disclosure provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the ambient light detection method described above are implemented.

[0144] Obviously, the above embodiments of the present disclosure are merely examples for clearly illustrating the present disclosure, and are not limitations on the implementation methods of the present disclosure. For ordinary technicians in this field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A display module, characterized in that: It includes a cover plate, a display panel and a backlight module which are arranged in sequence along a first direction, wherein a detection light sensing group, a first correction light sensing group and a second correction light sensing group are integrated in the display panel, and each of the detection light sensing group, the first correction light sensing group and the second correction light sensing group includes at least one photosensitive transistor, and the light emitting side of the display panel is a light-transmitting area at a position corresponding to the detection light sensing group, and is a light-shielding area at a position corresponding to the first correction light sensing group and the second correction light sensing group; the backlight side of the display panel is a light-transmitting area at a position corresponding to the detection light sensing group and the first correction light sensing group, and is a light-shielding area at a position corresponding to the second correction light sensing group.

2. The display module according to claim 1, characterized in that: The display panel includes a display area and a frame area surrounding the display area, the cover 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 the first projection and is larger than the first projection, and the third projection covers the second projection, and the display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked along the first direction , the detection 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 detection 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 shading area and the second shading area in the first plane both cover the orthographic projection of the second correction light sensing group in the first plane, the first substrate is provided with a color filter layer at a position corresponding to the detection light sensing group, and a first black matrix layer at a position corresponding to the first correction light sensing group and the second correction light sensing group, and the first plane is a plane parallel to the display panel.

3. The display module according to claim 2, characterized in that: The detection light sensing group includes at least a first color detection light sensing group, a second color detection light sensing group and a third color detection light sensing group, the color filter layer includes a first color color filter layer, a second color color filter layer and a third color color filter layer, and the first substrate is provided with the first color color filter layer at a position corresponding to the first color detection light sensing group, the second color color filter layer is provided at a position corresponding to the second color detection light sensing group, and the third color color filter layer is provided at a position corresponding to the third color detection light sensing group.

4. The display module according to claim 3, characterized in that: The first substrate is also 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 light sensing group, the first color filter layer is arranged on the same layer as the first color filter layer, the second color filter layer is arranged on the same layer as the second color filter layer, and the third color filter layer is arranged on 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 a position corresponding to the first correction light sensing group, and the second black matrix layer is stacked with the first black matrix along the first direction.

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

7. The display module according to claim 6, characterized in that: The first color detection light sensing group, the second color detection light sensing group, the third color detection light sensing group, the first correction light sensing group and the second correction light sensing group are equally spaced in the third direction.

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

9. The display module according to claim 2, characterized in that: The cover plate includes a transparent cover plate body and an ink layer arranged at 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 rubber frame and a light-shielding tape, wherein the light-shielding tape is arranged on a side of the rubber frame facing the display panel, and an area of ​​the backlight module not shielded by the light-shielding tape forms the second light-transmitting area, and an area of ​​the backlight module where the light-shielding tape is arranged forms the second light-shielding area.

11. The display module according to claim 6, characterized in that: The distance S between the photosensitive transistor in the second correction photosensitive group and the display area in the second direction is: S=max(s1,s2)+a, wherein max(s1,s2) represents the maximum value of s1 and s2, a is a constant, s1 represents the critical distance between the photosensitive transistor and the inner boundary line of the first shading area in the second direction when the ambient light is blocked by the first shading area and cannot enter the photosensitive transistor in the second correction photosensitive group, and s2 represents the critical distance between the photosensitive transistor and the inner boundary line of the second shading area in the second direction when the backlight is blocked by the second shading area and cannot enter the photosensitive transistor in the second correction photosensitive group.

12. The display module according to claim 11, 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, and 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°) Wherein, T1 represents the sum of the thicknesses of the first polarizer, the optical adhesive layer and the first substrate, n1 represents the refractive index of air, 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.

13. A display device, characterized in that: Comprising a display module as described in any one of claims 1 to 12.

14. An ambient light detection method, applicable to the display module according to any one of claims 1 to 12, characterized in that: The ambient light detection method comprises: Acquire a first sensing result output by the detection light sensing group, a second sensing result output by the first correction light sensing group, and a third sensing result output by the second correction light sensing group, wherein the third sensing result is a temperature influence value; Calculating a backlight impact value according to the second sensing result and the third sensing result; The first sensing result is corrected according to the backlight impact value and the temperature impact value to obtain an ambient light detection result.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the ambient light detection method as claimed in claim 14 are implemented.

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