A stacked screen display device and a control method of a display device

Abstract

The present disclosure provides a stacked screen display device and a display device control method. The stacked screen display device comprises a backlight module, a light control panel and a display panel which are sequentially stacked. The backlight module comprises a back plate, a light reflection plate and a diffusion plate which are sequentially stacked. The light reflection plate is provided with a plurality of light emitting units. The backlight module is provided with a temperature sensor. The temperature sensor is used to detect the temperature of the backlight module and compensate the display panel according to the temperature. The present disclosure detects the temperature of the backlight module by the temperature sensor and compensates the display panel according to the temperature detection result, which helps to reduce the influence of temperature on the display effect of the display panel and improve the display effect.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a stacked-screen display device and a method for controlling the display device. Background Art

[0002] Liquid crystal display devices require a backlight source. The backlight source may generate a lot of heat during operation, causing the overall temperature of the display device to change. The temperature change of the display device may cause the color temperature of the display device to change, affecting the display effect. Summary of the Invention

[0003] In a first aspect, an embodiment of the present disclosure provides a stacked screen display device, comprising a backlight module, a light control panel and a display panel stacked in sequence, wherein the backlight module comprises a back plate, a reflective plate and a diffuser plate stacked in sequence, a plurality of light-emitting units are arranged on the reflective plate, and a temperature sensor is provided on the backlight module, and the temperature sensor is used to detect the temperature of the backlight module to compensate the display panel according to the temperature.

[0004] Optionally, the reflective plate is rectangular, and has a first central axis and a second central axis that are perpendicular to each other. The temperature sensor is arranged on a side of the reflective plate close to the diffuser, and the positions of the temperature sensors are symmetrically distributed about the first central axis and the second central axis.

[0005] Optionally, the first central axis and the second central axis divide the reflector into four rectangular sub-areas, and the temperature sensors in each sub-area are symmetrically distributed about the two central axes of the sub-area.

[0006] Optionally, the number of the temperature sensors is four, and the four temperature sensors are respectively located at the geometric center of the sub-area.

[0007] Optionally, the light-emitting units are arranged at equal intervals along a first direction and a second direction on the reflective plate to form a light-emitting unit array, wherein the first direction and the second direction are different directions, and the temperature sensor is located at the geometric center of the four most adjacent light-emitting units.

[0008] Optionally, the number of the temperature sensors is four, and the four temperature sensors are respectively located at four vertices of the backlight module.

[0009] Optionally, at the edge of the backlight module, the reflective plate forms a bent portion that bends away from the back panel, and a rubber frame is provided between the bent portion and the back panel. At least part of the surface of the rubber frame extends along the surface of the back panel and the bent portion, and is respectively in contact with the back panel and the reflective plate. A accommodating cavity is formed on the inner side of the rubber frame, and the temperature sensor is located in the accommodating cavity.

[0010] Optionally, a pad is further included between the back panel and the reflective panel, and the pad includes an edge portion extending between the bent portion and the back panel, and two opposite surfaces of the edge portion are respectively abutted against the rubber frame and the back panel, and the temperature sensor is arranged at the portion where the rubber frame abuts against the edge portion, and the temperature sensor is located on a side surface of the rubber frame away from the back panel.

[0011] Optionally, the temperature sensor includes an input end for obtaining an input signal, an output end for outputting a temperature signal, and multiple address ends for obtaining address signals. The input ends of the multiple temperature sensors are connected to the input voltage end that provides the same input signal, and the output ends of the multiple temperature sensors are all connected to the output bus. The temperature sensor obtains the address signal corresponding to each temperature sensor through the multiple address ends.

[0012] In a second aspect, an embodiment of the present disclosure provides a method for controlling a display device, the method comprising:

[0013] detecting the temperature of the backlight module by a temperature sensor provided on the backlight module of the display device;

[0014] determining a temperature of a display panel of the display device according to the backlight module;

[0015] The color coordinates of the display panel are compensated according to a preset compensation table corresponding to the temperature of the display panel.

[0016] Optionally, the backlight module includes N backlight areas and N groups of temperature sensors corresponding to the N backlight areas, each group of temperature sensors includes one or more temperature sensors, and the display panel includes N display areas corresponding to the N backlight areas;

[0017] The method of detecting the temperature of the backlight module by a temperature sensor provided in the backlight module of the display device includes:

[0018] detecting the temperatures of the N backlight areas by respectively using the N groups of temperature sensors;

[0019] The determining the temperature of the display panel of the display device according to the backlight module includes:

[0020] determining the temperatures of the N display areas according to the temperatures of the N backlight areas respectively;

[0021] The compensating the color coordinates of the display panel according to a preset compensation table corresponding to the temperature of the display panel includes:

[0022] The N display areas are compensated respectively according to the temperatures of the N display areas.

[0023] Optionally, the temperature sensor includes an output terminal for outputting a temperature signal and multiple address terminals for obtaining address signals, the input terminals of the multiple temperature sensors are connected to an input voltage terminal providing the same input signal, and the output terminals of the multiple temperature sensors are all connected to an output bus;

[0024] The method of detecting the temperature of the backlight module by a temperature sensor provided in the backlight module of the display device includes:

[0025] acquiring address signals and temperature signals transmitted by the plurality of temperature sensors through the output bus;

[0026] determining a correspondence between the temperature signal and the backlight area according to the address signal;

[0027] The temperature of each of the backlight areas is determined according to the temperature signal.

[0028] Optionally, determining the temperature of the display panel of the display device according to the backlight module includes:

[0029] Acquiring a preset corresponding relationship, wherein the preset corresponding relationship is a pre-measured relationship between a temperature difference between the backlight module and the display panel and a working time of the display device;

[0030] The temperature of the display panel is calculated according to the preset corresponding relationship and the temperature of the backlight module.

[0031] Optionally, obtaining the preset corresponding relationship includes:

[0032] The temperature of the backlight module is detected by the temperature sensor when the display device is not working as the ambient temperature;

[0033] According to the ambient temperature, a preset corresponding relationship matching the ambient temperature is determined.

[0034] The embodiment of the present disclosure realizes temperature detection of the backlight module by providing a temperature sensor, and compensates the display panel according to the temperature detection result, which helps to reduce the influence of temperature on the display effect of the display panel and improve the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present disclosure;

[0037] Figure 2 This is a schematic diagram of a partial structure of a backlight module provided in one embodiment of the present disclosure;

[0038] Figure 3 is a schematic diagram of the arrangement of a temperature sensor in one embodiment of the present disclosure;

[0039] Figure 4 is another schematic diagram of the arrangement of the temperature sensor in one embodiment of the present disclosure;

[0040] Figure 5 is a schematic diagram of the positions of the temperature sensor and the light emitting unit in one embodiment of the present disclosure;

[0041] Figure 6 is another schematic diagram of the positions of the temperature sensor and the light emitting unit in one embodiment of the present disclosure;

[0042] Figure 7 is another schematic diagram of the arrangement of the temperature sensor in one embodiment of the present disclosure;

[0043] Figure 8 is a schematic diagram of the connection relationship of the temperature sensors in one embodiment of the present disclosure;

[0044] Figure 9 is a flow chart of a method for controlling a display device in one embodiment of the present disclosure;

[0045] Figure 10 is a schematic diagram of a compensation relationship in an embodiment of the present disclosure;

[0046] Figure 11 is a partial schematic diagram of a compensation table in one embodiment of the present disclosure;

[0047] Figure 12 Schematic diagram of adjusting color coordinates in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort shall fall within the scope of protection of the present disclosure.

[0049] An embodiment of the present disclosure provides a stacked-screen display device.

[0050] like Figure 1 As shown, in one embodiment, the stacked screen display device includes a backlight module 100, a light control panel 300 and a display panel 500 stacked in sequence, wherein the light control panel 300 (or sub-panel) includes a plurality of light control pixels, and the display panel 500 (or main panel) includes a plurality of display pixels.

[0051] The main difference between the light control panel 300 and the display panel 500 is that the display panel 500 also includes a color filter, and the light control panel 300 is used to control the passage of light at the pixel level or even the sub-pixel level through liquid crystal deflection, thereby improving the display contrast of the display device and improving the display effect.

[0052] like Figure 2 As shown, in one embodiment, the backlight module 100 includes a back panel 101, a reflector 102 and a diffuser 103 stacked in sequence, and a plurality of light-emitting units 107 are provided on the reflector 102, wherein the light-emitting units 107 can be light sources such as diodes that provide illumination. The reflector 102 is used to reflect light toward the side away from the back panel 101 so that more light is transmitted toward the display panel to improve the display brightness, and the diffuser 103 is used to make the light more uniform.

[0053] The backlight module 100 further includes a temperature sensor 200 , which is used to detect the temperature of the backlight module 100 so as to compensate the display panel according to the temperature.

[0054] It should be understood that due to the limited working efficiency of the light emitting unit 107, part of the electrical energy will be converted into heat energy during operation, thereby causing the temperature of the display device to rise. The backlight module 100 is one of the main heat sources during the operation of the display device.

[0055] Affected by the temperature change of the backlight module 100 , the temperature of the display panel will also change to a certain extent, which will further affect the display effect of the display panel to a certain extent.

[0056] During the implementation of the present disclosure, technicians discovered that if the temperature sensor 200 is placed in the display area (AA) of the display panel, it may have a certain impact on the display effect. For example, it may block part of the light, affecting the brightness of the display panel. If the temperature sensor 200 is placed in the peripheral area of ​​the display panel, the detection effect of the display panel temperature is poor. In addition, if the temperature sensor 200 is placed on the display panel, the production process of the display panel needs to be adjusted, which will lead to a significant increase in production and R&D costs, and compared with the relatively mature existing display panels, the stability and reliability of the product may be reduced.

[0057] Technicians have also discovered that since the heat of the display panel mainly comes from the backlight module 100 , the temperature of the display panel can be further determined by detecting the temperature of the backlight module 100 to compensate for the display effect of the display panel.

[0058] like Figure 3 As shown, in one embodiment, the reflector 102 is rectangular and has a first central axis MM' and a second central axis NN' that are perpendicular to each other. The positions of the multiple temperature sensors 200 are symmetrically distributed about the first central axis MM' and the second central axis NN'. The temperature sensors 200 are arranged on the reflector 102 and are located between the reflector 102 and the diffuser 103, which can also be understood as the side of the reflector 102 close to the diffuser 103 or the side of the reflector 102 away from the back plate 101.

[0059] like Figure 3 and Figure 4 As shown, the reflector 102 has a first central axis MM' and a second central axis NN' that are perpendicular to each other. It can be understood that the first central axis MM' and the second central axis NN' are the lines connecting the midpoints of two pairs of opposite sides of the rectangular reflector 102. The multiple temperature sensors 200 are symmetrically distributed about the first central axis MM' and the second central axis NN'. This ensures a relatively uniform distribution of the temperature sensors 200, ensuring accurate backlight module temperature detection.

[0060] The embodiment of the present disclosure realizes the detection of the temperature of the backlight module 100 by setting up multiple temperature sensors 200, and the positions of the multiple sensors are symmetrically distributed about the first central axis and the second central axis of the backlight module 100, which can improve the detection accuracy of the temperature of the backlight module 100, thereby helping to improve the compensation effect of the display panel.

[0061] like Figure 3 and Figure 4As shown, in some embodiments, the first central axis MM' and the second central axis NN' divide the reflector 102 into four rectangular sub-areas A, B, C, and D, and the temperature sensors 200 are symmetrically distributed about the two central axes of each sub-area.

[0062] For example, Figure 3 As shown, in one embodiment, the number of temperature sensors 200 is four, and the four temperature sensors 200 are respectively located at the geometric center of the sub-region. Figure 4 As shown, more temperature sensors 200 can be provided and symmetrically distributed in each sub-region, which helps to further improve the temperature detection accuracy.

[0063] The light-emitting units 107 are arranged on the reflective plate 102 at equal intervals along a first direction and a second direction to form a light-emitting unit array, wherein the first direction and the second direction are different directions.

[0064] The positions of the light emitting units 107 in two adjacent columns are aligned along the first direction and the second direction, or the light emitting units 107 in two adjacent columns are staggered in the first direction and the second direction.

[0065] like Figure 5 and Figure 6 As shown, in this embodiment, the first direction is horizontal and the second direction is vertical. Figure 5 As shown, two adjacent columns of light emitting units 107 can be aligned, as shown in FIG. Figure 6 As shown, two adjacent columns of light emitting units 107 can also be staggered to form an array of light emitting units 107 arranged at equal intervals. The temperature sensor is located at the geometric center of the four most adjacent light emitting units 107.

[0066] like Figure 5 and Figure 6 As shown, the temperature sensor is set at the geometric center of the four most adjacent light-emitting units 107, specifically the intersection of the diagonals of the four light-emitting units 107 arranged in a rectangle or parallelogram, which helps to reduce the impact on the light-emitting units 107.

[0067] like Figure 7 As shown, in some embodiments, the number of the temperature sensors 200 is four, and the four temperature sensors 200 are respectively located at four vertices of the backlight module 100 .

[0068] By arranging the temperature sensors 200 at the four vertices of the backlight module 100 , the temperature of the backlight module 100 can also be detected, and at the same time, the thickness of the backlight module 100 can be reduced.

[0069] like Figure 2As shown, at the edge of the backlight module 100, the reflector 102 forms a bent portion 102A that bends away from the back panel 101, and a plastic frame 104 is provided between the bent portion 102A and the back panel 101. At least part of the surface of the plastic frame 104 extends along the surface of the back panel 101 and the bent portion 102A, and is respectively in contact with the back panel 101 and the reflector 102. A accommodating cavity 106 is formed on the inner side of the plastic frame 104, and the temperature sensor 200 is located in the accommodating cavity 106.

[0070] By bending the reflective plate 102 to form the bent portion 102A, the accommodating cavity 106 for accommodating the temperature sensor 200 can be provided without increasing the thickness of the backlight module 100 , thereby reducing the required occupied space.

[0071] like Figure 2 As shown, in some embodiments, a pad 105 is further included between the back plate 101 and the reflective plate 102. The pad 105 includes an edge portion 105A extending between the bent portion 102A and the back plate 101. Two opposite surfaces of the edge portion 105A are respectively in contact with the plastic frame 104 and the back plate 101. The temperature sensor 200 is arranged at the portion where the plastic frame 104 is in contact with the edge portion 105A, and the temperature sensor 200 is located on a side surface of the plastic frame 104 away from the back plate 101.

[0072] The backing plate 105 is used to prevent direct contact between the reflector 102 and the back plate 101, thereby protecting the backlight module 100. Furthermore, the backing plate 105 can also assist in heat dissipation to a certain extent. In some embodiments, the thermal conductivity of the backing plate 105 is greater than that of the reflector, thereby making the temperature distribution of the backlight module 100 more uniform.

[0073] like Figure 2 As shown, in some other embodiments, the temperature sensor 200 can also be set at the part where the plastic frame 104 abuts the reflector 102, specifically, at the part where the plastic frame 104 abuts the bent portion 102A, and at the side surface of the plastic frame 104 away from the bent portion 102A.

[0074] In the process of implementing the technical solution of the present disclosure, technicians found that the temperature difference between the back plate 101 and other structures of the display device and the display panel is large, and the temperature change is not obvious, while the temperature change rate of the reflector 102 is high and the temperature correlation with the display panel is large. Therefore, setting the temperature sensor 200 between the back plate 101 and the reflector 102, or setting it at the rubber frame 104 abutting the reflector 102, can improve the accuracy of temperature detection. Among them, when the temperature sensor 200 is set between the back plate 101 and the reflector 102 and abuts the reflector 102, the temperature detection is more accurate.

[0075] In some embodiments, the temperature sensor 200 includes an input end for obtaining an input signal, an output end for outputting a temperature signal, and a plurality of address ends for obtaining address signals, the input ends of the plurality of temperature sensors 200 are connected to an input voltage end VCC for providing the same input signal, and the output ends of the plurality of temperature sensors 200 are all connected to an output bus, which can be an I 2 C bus, and the temperature sensor 200 obtains an address signal corresponding to each temperature sensor 200 through the plurality of address ends.

[0076] In this embodiment, the position sensors at different positions are marked by address signals to determine the temperatures at different positions.

[0077] In this embodiment, four temperature sensors IC1, IC2, IC3, and IC4 are provided. Please refer to Figure 3 In this embodiment, IC1 is provided in the A sub-region, IC2 is provided in the B sub-region, IC3 is provided in the C sub-region, and IC4 is provided in the D sub-region for exemplary description.

[0078] As shown in Figure 8 Each temperature sensor 200 includes three address ends A0, A1, and A2, which provide high-level signals 1 and low-level signals 0, respectively, and can provide a total of eight different address signals.

[0079] As shown in Table 1, four address signals are selected from the address signals that can be provided as the address signals of the four temperature sensors 200, and the address signals of the respective temperature sensors 200 are all different, so that the positions of the different temperature sensors 200 can be marked.

[0080] Table 1: Temperature sensor address signal table

[0081] area Temperature sensor A0 A1 A2 A IC1 0 0 0 B IC2 0 0 1 C IC3 0 1 0 D IC4 0 1 1

[0082] It should be understood that if only four temperature sensors 200 are provided, only two address ends are needed to provide address signals, and different numbers of address ends can be provided to provide address signals according to the number of temperature sensors 200 during implementation.

[0083] The present disclosure provides a display device control method.

[0084] As shown in Figure 9 In one embodiment, the display device control method includes:

[0085] Step 901: detecting the temperature of the backlight module of the display device by a temperature sensor provided in the backlight module.

[0086] In this embodiment, the temperature of the backlight module is firstly acquired through a temperature sensor. Specifically, a corresponding temperature value is determined according to a temperature signal detected by the temperature sensor.

[0087] In one embodiment, the backlight module includes N backlight areas and N groups of temperature sensors corresponding to the N backlight areas. In each group of temperature sensors, there are one or more temperature sensors. The display panel includes N display areas corresponding to the N backlight areas.

[0088] In this embodiment, N is a positive integer, for example, when applied to Figure 3 or Figure 4 When the display device of the reflector shown is used, N is equal to 4. When the application includes Figure 3 When the display device of the reflective plate shown in the figure is used, the number of each temperature sensor is 1. Figure 3 In the display device of the reflective plate shown, the number of temperature sensors in each group is 5.

[0089] The step 901 specifically includes: detecting the temperatures of the N backlight areas respectively by using the N groups of temperature sensors.

[0090] That is, detecting the temperature of each backlight area separately helps to improve the accuracy of backlight module temperature detection, thereby enabling targeted compensation for each area of ​​the display panel, which helps to improve the compensation effect.

[0091] In some embodiments, the temperature sensor includes an output terminal for outputting a temperature signal and multiple address terminals for obtaining address signals, the input terminals of the multiple temperature sensors are connected to an input voltage terminal that provides the same input signal, and the output terminals of the multiple temperature sensors are all connected to an output bus.

[0092] For example, the temperature sensor can be set up as shown in Figure 8 The step 901 may further include:

[0093] acquiring address signals and temperature signals transmitted by the plurality of temperature sensors through the output bus;

[0094] determining a correspondence between the temperature signal and the backlight area according to the address signal;

[0095] The temperature of each of the backlight areas is determined according to the temperature signal.

[0096] In this embodiment, when the backlight module includes N sub-areas, different address signals are provided to the temperature sensor. While obtaining the temperature signal, the address signal corresponding to the temperature sensor is also obtained, so as to determine the correspondence between the obtained temperature signal and the backlight area, and then determine the temperature of each backlight area based on the temperature signal of the backlight area.

[0097] Step 902: Determine the temperature of the display panel of the display device according to the backlight module.

[0098] After the backlight module is determined, the temperature of the display panel is determined according to the temperature of the backlight module.

[0099] Exemplarily, in the case where the display panel includes N display areas, step 902 specifically includes: detecting the temperatures of the N backlight areas using the N groups of temperature sensors respectively.

[0100] It can be understood that the temperature of each display area of ​​the display panel can be determined according to the corresponding relationship between each display area and the corresponding backlight area.

[0101] In some embodiments, step 902 may further include:

[0102] Acquiring a preset corresponding relationship, wherein the preset corresponding relationship is a pre-measured relationship between a temperature difference between the backlight module and the display panel and a working time of the display device;

[0103] The temperature of the display panel is calculated according to the preset corresponding relationship and the temperature of the backlight module.

[0104] The temperature measured by the temperature sensor is the temperature of the backlight module, not the temperature of the display panel. Therefore, further calculation is required to obtain the temperature of the display panel.

[0105] In this embodiment, the corresponding relationship between the temperatures of the backlight module and the display panel at different working times is measured in advance through experiments. For example, a temperature change table over time can be established to record the temperature difference between the display panel and the backlight module at different working times of the display device as a preset corresponding relationship.

[0106] After the temperature of the backlight module is detected and obtained, the temperature of the display panel is obtained by querying the temperature change table over time according to the working time of the display device.

[0107] In some embodiments, obtaining the preset correspondence includes:

[0108] The temperature of the backlight module is detected by the temperature sensor when the display device is not working as the ambient temperature;

[0109] According to the ambient temperature, a preset corresponding relationship matching the ambient temperature is determined.

[0110] It should be understood that the temperature difference between the display panel and the backlight module is different at different ambient temperatures. Therefore, in this embodiment, the ambient temperature is further obtained, and the corresponding preset correspondence is called according to the ambient temperature.

[0111] During implementation, the display device can be tested first under different temperature environments to obtain the relationship between the temperature change of the backlight module and the display panel over time, and stored as the above-mentioned preset corresponding relationship. During operation, the corresponding preset corresponding relationship is called according to the ambient temperature, which can improve the accuracy of the display panel temperature estimation.

[0112] Step 903: Compensating the color coordinates of the display panel according to a preset compensation table corresponding to the temperature of the display panel.

[0113] Finally, the color coordinates of the display device are compensated according to a preset compensation table so that the color coordinates of the display device are within a preset range, thereby making the display effect of the display device relatively stable.

[0114] The following is an exemplary further description of the control method of the display device.

[0115] During the process of implementing the present disclosure, technicians discovered that the temperature change of the display panel is related to the operating time of the display device.

[0116] Specifically, in the initial stage of operation of the display device, the temperature of the display panel gradually rises, and after operating for a certain period of time, the temperature of the display panel tends to be stable.

[0117] Please refer to Table 2, which is a temperature variation table obtained from a test. The temperature variation table records the corresponding relationship between the temperature at different positions of the display panel and the backlight module of the display device and the working time of the display module.

[0118] The first row of Table 2 represents the position, A, B, C, and D represent Figure 3 The measurement results of the temperature sensors located in the four areas A, B, C, and D of the reflector are shown in FIG. 7 , where PA, PB, PC, and PD represent the temperatures of the four areas corresponding to the four areas A, B, C, and D of the display panel and the reflector, respectively.

[0119] The leftmost column in Table 2 shows the operating time of the display device in minutes. The data in the table are the temperature values ​​of the locations in the first row at the corresponding operating time in degrees Celsius.

[0120] Table 2: Temperature changes over time

[0121] A B C D PA PB PC PD 0 23.65 24.16 24.33 24.58 23.53 23.51 23.68 23.68 5 44.4 50.45 49.37 56.76 33.86 32.11 33.89 34.33 10 49 55.57 54.72 61.56 41.71 38.94 40.2 42.03 15 51.85 58.78 58.1 64.55 46.25 41.5 44.85 46.84 20 53.85 60.78 60.23 66.44 48.7 44.46 47.2 48.87 25 55.25 62.11 61.66 67.49 50.68 45.56 48.96 50.87 30 56.25 62.87 62.4 68.11 51.76 46.22 49.94 52.05 35 56.8 63.39 62.92 68.63 52.18 47.11 50.22 52.43 40 57.35 63.86 63.42 68.93 52.72 47.41 50.91 52.95 45 57.55 64.06 63.78 68.96 52.86 48.17 51.18 52.82 50 57.7 64.09 63.87 69.17 53.02 47.98 51.06 52.47 55 58 64.15 63.92 69.27 53.01 47.63 51.4 53.18 60 58.6 64.18 64.01 69.2 52.94 48.4 50.76 53.2 65 59.75 64.18 63.98 69.16 53.12 48.14 51.34 53.1 70 60.3 64.36 64.15 69.2 53.04 48.48 51.08 53.03 75 60.6 64.23 64.03 69.1 52.85 48.66 50.79 53.09 80 61 64.42 64.19 69.35 53.12 48.54 51.24 53.04 85 61.3 64.51 64.32 69.45 53.06 47.81 51.46 53.25 90 61.4 64.45 64.23 69.5 52.62 47.25 51.29 53.17 95 61.75 64.65 64.37 69.55 52.92 48.81 50.83 53.41 100 61.7 64.55 64.27 69.31 53.04 48.43 51.19 53.18 105 61.8 64.57 64.24 69.26 52.86 48.26 50.92 53 110 61.85 64.6 64.3 69.36 52.81 49 51.18 52.98 115 61.95 64.64 64.31 69.44 52.85 49.55 50.88 53.67 120 62.1 64.63 64.27 69.42 52.86 47.9 50.98 52.94

[0122] It can be seen from Table 2 that when the display device is not working, the temperature of the display panel and the backlight module is substantially equal to the room temperature. In this embodiment, the room temperature is approximately 24 degrees Celsius.

[0123] The technical solution of this embodiment is applied to a display device. The display device in this embodiment can be a conventional display device, and is more suitable for application to a stacked screen display device, for example, it can be the stacked screen display device in the above-mentioned stacked screen display device embodiment. It should be understood that since a light control panel is also provided between the backlight module and the display panel of the stacked screen display device, the temperature difference between the display panel and the backlight module is relatively large.

[0124] After testing, it was found that after a certain period of continuous operation, about 40 minutes in this embodiment, the temperature of the display device tends to be relatively stable, and there is a certain temperature difference between the temperature of the display panel and the temperature of the backlight module. The temperature difference varies at different working times.

[0125] In order to maintain a relatively stable display effect, in this embodiment, under ideal conditions, the color coordinate values ​​of the display panel are controlled to satisfy Wx / Wy: 0.313 / 0.329, wherein Wx and Wy are the coordinate values ​​of the color coordinates, respectively. Furthermore, considering the control error and the fact that a certain color coordinate difference has little effect on the actual display effect, in this embodiment, the ratio of the color coordinates is allowed to have a certain fluctuation range, which can be different values ​​such as 0.05 and 0.005. For example, when the fluctuation range is 0.005, the color coordinate value satisfies Wx / Wy: 0.313±0.005 / 0.329±0.005. In this embodiment, the fluctuation corresponding to the preset range is set to 0.01 or 0.005 to provide a relatively stable display effect.

[0126] In this embodiment, first, different compensation relationships are set according to different temperatures of the display panel. In this embodiment, the compensation relationships are recorded in a compensation table, which may specifically be an ACC table (Accurate Color Capture table).

[0127] like Figure 10 As shown, in this embodiment, the temperature is divided into four intervals and four corresponding compensation tables are set. In the compensation stages corresponding to different temperature intervals, the expected target compensation results are all within the above preset ranges. During implementation, the specific number of divided temperature intervals is not limited to this.

[0128] The multiple compensation tables are all measured or calculated in advance and stored in a storage chip, such as a register. When the display panel needs to be compensated, the compensation data in the corresponding compensation table is called according to the temperature.

[0129] As shown in Table 2, at the same time, there is a certain difference between the temperature of the display panel and the temperature of the backlight module. Please refer to Table 2 again. The difference between the temperature of the display panel and the temperature of the backlight module will change over time.

[0130] In this embodiment, the temperature relationship between the display panel and the backlight module at different operating times is pre-tested to generate and store a temperature variation table similar to Table 2. During operation, the temperature of the backlight module is measured using a temperature sensor. The stored temperature variation table is then called up. Based on the data in the table, the display panel temperature at a specific moment can be determined based on the operating time of the display device and the temperature of the backlight module of the display module. Finally, the corresponding compensation table is called up based on the display panel temperature to compensate for the display effect of the display panel.

[0131] For example, in Table 2, the ambient temperature of the backlight module is approximately 24 degrees Celsius. When the display device operates for 60 minutes, the temperature of backlight area A is approximately 58.6 degrees Celsius. The temperature of the display panel and the display area PA corresponding to backlight area A is approximately 52.94 degrees Celsius, resulting in a temperature difference of approximately 5.66 degrees Celsius. In actual applications, when the ambient temperature is 24 degrees Celsius and the display device operates for 60 minutes, the actual measured temperature is approximately 58 degrees Celsius. Based on this temperature difference, the temperature of display area PA is estimated to be approximately 52.34 degrees Celsius.

[0132] It should be understood that when working at different ambient temperatures, the temperature change trend of the display device is different. In this embodiment, it is further possible to pre-measure and prepare a table of the temperature changes over time of the display panel and backlight module at different ambient temperatures, and use the temperature of the backlight module measured when the display device is not working as the ambient temperature, and call the change table under the corresponding ambient temperature based on the ambient temperature, which helps to further improve the accuracy of the display panel temperature calculation.

[0133] In this way, the technical solution of this embodiment can relatively accurately determine the temperature of the display panel according to the temperature correspondence between the display panel and the backlight module at different working times, thereby being able to more accurately compensate the display panel and improve the compensation effect.

[0134] like Figure 11 As shown, Figure 11This is part of the data in the compensation table corresponding to a certain temperature. In this embodiment, the compensation table provides the grayscale values ​​of the three different color sub-pixels of red R, green G, and blue B corresponding to each grayscale (gamma) at each stage. According to the grayscale values, the corresponding color coordinates can be determined. Figure 12 As shown, by adjusting the color coordinates, the display states of the display panels can be made substantially consistent, which helps to improve the display effect.

[0135] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A stacked display device, comprising a backlight module, a light control panel, and a display panel stacked in sequence, the backlight module comprising a back plate, a reflector, and a diffuser, the reflector being provided with a plurality of light-emitting units, the light-emitting units being equally spaced along a first direction and a second direction on the reflector to form a light-emitting unit array, the backlight module being provided with a temperature sensor for detecting the temperature of the backlight module to compensate the display panel based on the temperature; At the edge of the backlight module, the reflector forms a bent portion that bends away from the back plate, a plastic frame is provided between the bent portion and the back plate, at least a portion of the surface of the plastic frame extends along the surface of the back plate and the bent portion, and abuts against the back plate and the reflector respectively, an accommodating cavity is formed inside the plastic frame, and the temperature sensor is located in the accommodating cavity; the temperature sensor is located on a side surface of the plastic frame away from the back plate; A pad is further included between the back plate and the reflective plate, and the thermal conductivity of the pad is greater than that of the reflective plate.

2. The stacked screen display device according to claim 1, wherein: The reflector is rectangular and has a first central axis and a second central axis perpendicular to each other. The temperature sensor is arranged on a side of the reflector close to the diffuser, and the positions of the temperature sensors are symmetrically distributed about the first central axis and the second central axis.

3. The stacked screen display device according to claim 2, wherein: The first central axis and the second central axis divide the reflector into four rectangular sub-areas, and the temperature sensors in each sub-area are symmetrically distributed about the two central axes of the sub-area.

4. The stacked screen display device according to claim 3, wherein: The number of the temperature sensors is four, and the four temperature sensors are respectively located at the geometric center of the sub-area.

5. The stacked screen display device according to any one of claims 1 to 4, wherein: The first direction and the second direction are different directions, and the temperature sensor is located at the geometric center of the four most adjacent light-emitting units.

6. The stacked screen display device according to claim 1, wherein: There are four temperature sensors, and the four temperature sensors are respectively located at four vertices of the backlight module.

7. The stacked screen display device according to claim 1, wherein: The pad includes an edge portion extending between the bent portion and the back plate, two opposite surfaces of the edge portion respectively abut against the plastic frame and the back plate, and the temperature sensor is arranged at the portion where the plastic frame abuts the edge portion.

8. The stacked screen display device according to claim 1, wherein: The temperature sensor includes an input terminal for obtaining an input signal, an output terminal for outputting a temperature signal, and multiple address terminals for obtaining address signals. The input terminals of the multiple temperature sensors are connected to an input voltage terminal that provides the same input signal, and the output terminals of the multiple temperature sensors are all connected to an output bus. The temperature sensor obtains the address signal corresponding to each temperature sensor through the multiple address terminals.

9. A method for controlling a display device, applied to the stacked-screen display device according to any one of claims 1 to 8, the method comprising: detecting the temperature of the backlight module by a temperature sensor provided on the backlight module of the display device; determining a temperature of a display panel of the display device according to the backlight module; The color coordinates of the display panel are compensated according to a preset compensation table corresponding to the temperature of the display panel.

10. The method according to claim 9, wherein: The backlight module includes N backlight areas and N groups of temperature sensors corresponding to the N backlight areas, each group of temperature sensors includes one or more temperature sensors, and the display panel includes N display areas corresponding to the N backlight areas; The method of detecting the temperature of the backlight module by a temperature sensor provided in the backlight module of the display device includes: detecting the temperatures of the N backlight areas by respectively using the N groups of temperature sensors; The determining the temperature of the display panel of the display device according to the backlight module includes: determining the temperatures of the N display areas according to the temperatures of the N backlight areas respectively; The compensating the color coordinates of the display panel according to a preset compensation table corresponding to the temperature of the display panel includes: The N display areas are compensated respectively according to the temperatures of the N display areas.

11. The method according to claim 10, wherein: The temperature sensor includes an output terminal for outputting a temperature signal and multiple address terminals for obtaining address signals, the input terminals of the multiple temperature sensors are connected to an input voltage terminal providing the same input signal, and the output terminals of the multiple temperature sensors are all connected to an output bus; The method of detecting the temperature of the backlight module by a temperature sensor provided in the backlight module of the display device includes: acquiring address signals and temperature signals transmitted by the plurality of temperature sensors through the output bus; determining a correspondence between the temperature signal and the backlight area according to the address signal; The temperature of each of the backlight areas is determined according to the temperature signal.

12. The method according to claim 9, wherein Determining the temperature of the display panel of the display device according to the backlight module includes: Acquiring a preset corresponding relationship, wherein the preset corresponding relationship is a pre-measured relationship between a temperature difference between the backlight module and the display panel and a working time of the display device; The temperature of the display panel is calculated according to the preset corresponding relationship and the temperature of the backlight module.

13. The method according to claim 12, wherein: The obtaining of the preset corresponding relationship includes: The temperature of the backlight module is detected by the temperature sensor when the display device is not working as the ambient temperature; According to the ambient temperature, a preset corresponding relationship matching the ambient temperature is determined.

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