Display module and control method therefor, and display device

Abstract

A display module and a control method therefor, and a display device. The display module comprises: a primary screen (1) and a secondary screen (2) which are stacked; a temperature sensor (3) arranged on the secondary screen (2) and used for measuring operating temperatures of the secondary screen (2) corresponding to different times within a preset time period following the start of a display module, wherein the preset time period is a corresponding time period from the time when the display module is started to the time when the operating temperature of the display module is stable; and a controller used for determining, on the basis of each working temperature and a difference between the temperature of the surface of the secondary screen (2) and the temperature of the surface of the primary screen (1), screen temperatures of the display module corresponding to different times within the preset time period, and adjusting, on the basis of each screen temperature, a voltage related to color coordinates of a pixel, so that a deviation between a color coordinate value of a picture displayed by the display module in the preset time period and a preset color coordinate value is smaller than or equal to 10‰.

Description

Display module, control method thereof, and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display module, a control method thereof, and a display device. Background Art

[0002] As a type of LCD display product, the stacked screen is not only comparable to OLED products in contrast, but also has the advantages of long life and low price.

[0003] However, when the stacked screen is in use, the transmittance is generally low (for example, the transmittance of a 31.5 ultra-high-definition screen is often less than 2%). This means that in order to increase the brightness of the stacked screen, it is necessary to increase the backlight brightness of the stacked screen to make the brightness of the stacked screen reach the high-brightness specification.

[0004] However, the problem with high brightness is the increased operating temperature of the stacked screen. After the stacked screen is turned on, as the temperature rises from room temperature to a stable state, the product's color coordinates change with temperature, causing color coordinate shift. For example, a 31.5" UHD stacked screen with 2% transmittance requires a backlight brightness of 5W to meet the 1000nit brightness specification. After powering on, the operating temperature of the stacked screen rises from room temperature to 57°C, and during this process, the white point coordinates shift (34‰, 21‰) (Figure 1, Table 1).

[0005] Table 1

[0006] Among them, Wx and Wy are the horizontal and vertical coordinate values ​​of the color coordinates in the white screen, and △WY is the brightness difference of the white screen; Rx and Ry are the horizontal and vertical coordinate values ​​of the color coordinates in the red screen, and △RY is the brightness difference of the red screen; Gx and Gy are the horizontal and vertical coordinate values ​​of the color coordinates in the green screen, and △GY is the brightness difference of the green screen; Bx and By are the horizontal and vertical coordinate values ​​of the color coordinates in the blue screen, and △BY is the brightness difference of the blue screen.

[0007] The color coordinate offset of the stacked screen will affect the viewing experience and also affect the product reputation; therefore, how to improve the color coordinate offset of the stacked screen has become a technical problem that needs to be solved urgently.

[0008] Summary of the Invention

[0009] The embodiments of the present disclosure provide a display module, a control method thereof, and a display device to solve the problem of color coordinate shift in the prior art.

[0010] In a first aspect, to solve the above technical problems, the present disclosure provides a display module, comprising:

[0011] Main screen and sub screen with stacked settings;

[0012] a temperature sensor, provided on the secondary screen, for measuring the operating temperature of the secondary screen at different times within a preset time period after the display module is powered on; wherein the preset time period is the time period from when the display module is powered on to when the operating temperature of the display module stabilizes;

[0013] A controller is used to determine the screen temperature of the display module corresponding to different times in the preset time period based on each of the operating temperatures and the temperature difference between the surfaces of the secondary screen and the main screen, and adjust the voltage associated with the color coordinates of the pixel according to each of the screen temperatures, so that the deviation of the color coordinate value of the picture displayed by the display module in the preset time period compared with the preset color coordinate value is less than or equal to 10‰.

[0014] In a possible implementation manner, the controller is further configured to:

[0015] Determine the temperature range of each screen temperature; wherein the temperature range of the display module from the room temperature at startup to the stable operating temperature is divided into multiple continuous temperature ranges;

[0016] The voltage adjustment value corresponding to each temperature range of the screen temperature is selected to adjust the voltage related to the color coordinate, so that the deviation of the color coordinate value of the picture displayed by the display module in the preset time period compared with the preset color coordinate value is less than or equal to 10‰.

[0017] In a possible implementation manner, the plurality of continuous temperature intervals are composed of a plurality of temperature intervals of equal length;

[0018] Alternatively, the length of a portion of the temperature intervals of the multiple connecting lines is a first length, and the length of another portion of the temperature interval is a second length; wherein the first length is smaller than the second length.

[0019] In one possible implementation, the main screen includes a main array substrate and a main color filter substrate that are arranged opposite to each other, and a main liquid crystal layer located between the main array substrate and the main color filter substrate; the secondary screen includes a secondary array substrate and a secondary color filter substrate that are arranged opposite to each other, and a secondary liquid crystal layer located between the secondary array substrate and the secondary color filter substrate;

[0020] The main liquid crystal layer adopts wide temperature liquid crystal;

[0021] The auxiliary liquid crystal layer adopts negative liquid crystal.

[0022] In a possible implementation, the wide temperature liquid crystal has a clearing point greater than or equal to 95° C., a birefringence greater than or equal to 0.098, and a variation in the birefringence with temperature within a range of 25° C. to 45° C. is less than 7%.

[0023] In a possible implementation manner, the display module further includes:

[0024] A high-temperature resistant backlight module; wherein, when the operating temperature of the high-temperature resistant backlight module rises from room temperature to 45°C, the change amplitude of the color coordinates of the backlight module is less than or equal to a preset amplitude.

[0025] In a possible implementation manner, the backlight module includes:

[0026] Fluorescent-based backlight modules, or quantum dot-based backlight modules.

[0027] In a possible implementation manner, the secondary array substrate includes:

[0028] A plurality of auxiliary data lines and a plurality of auxiliary gate lines; the plurality of auxiliary data lines and the plurality of auxiliary gate lines intersect to define a plurality of pixel areas, the pixel areas corresponding one-to-one to the pixel areas in the main screen, the pixel areas of the main screen including a plurality of sub-pixel areas;

[0029] a plurality of sub-pixel electrodes corresponding one-to-one to the plurality of pixel areas;

[0030] A plurality of sub-pixel switches are provided, wherein a gate of each sub-pixel switch is electrically connected to the sub-gate line, a first electrode of each sub-pixel switch is connected to the sub-data line, and a second electrode of each sub-pixel switch is connected to the sub-pixel electrode.

[0031] In a possible implementation manner, the secondary array substrate further includes:

[0032] The auxiliary common electrode and the auxiliary common electrode line arranged in the same layer are located on a side of the auxiliary pixel electrode away from the main screen, and the auxiliary common electrode line is connected to the edge of the auxiliary common electrode.

[0033] In a possible implementation manner, the secondary color filter substrate includes a secondary black matrix;

[0034] The sub-black matrix includes island structures corresponding to the plurality of sub-pixel switches one by one, and the island structures completely cover the corresponding sub-pixel switches.

[0035] In a possible implementation manner, the main color filter substrate includes:

[0036] A plurality of color resists are high-transmittance color resists having a light transmittance greater than a preset light transmittance.

[0037] In a possible implementation manner, the main color filter substrate further includes:

[0038] A high-transmittance polarizer is located on a side of the plurality of color resists away from the main array substrate; wherein a single unit transmittance of the high-transmittance polarizer is greater than or equal to 42.7%.

[0039] In one possible implementation manner, the main array substrate includes:

[0040] Multiple main grid line groups and multiple main data lines;

[0041] a plurality of main pixel electrode pairs located in a plurality of areas defined by intersections of the plurality of main gate line groups and the plurality of main data lines, the main gate line group including two main gate lines, the two main gate lines being located on either side of a row of main pixel electrode pairs, the main pixel electrode pairs including two main pixel electrodes arranged along an extension direction of the main gate lines, the two main gate lines being electrically connected to different main pixel electrodes in the corresponding row of main pixel electrode pairs;

[0042] a plurality of main pixel switches, wherein the gates of the main pixel switches are connected to the corresponding main gate lines, the first electrodes of the main pixel switches are connected to the corresponding main data lines, and the second electrodes of the main pixel switches are connected to the corresponding main pixel electrodes;

[0043] Part of the main data line between two adjacent main pixel switches connected to the same main data line is reused as an isolation column platform, and the extension direction of the long side of the isolation column platform is the same as the extension direction of the main data line.

[0044] In a possible implementation manner, the main array substrate further includes:

[0045] A plurality of isolation columns, each of the isolation columns corresponds to the isolation column carrier in a one-to-one manner;

[0046] An extension direction of the long side of the isolation column is the same as an extension direction of the main data line.

[0047] In a second aspect, an embodiment of the present disclosure provides a control method for the display module according to the first aspect, comprising:

[0048] After the display module is powered on, the operating temperature of the secondary screen in the display module is measured in real time;

[0049] Determining the screen temperature of the display module in real time based on the operating temperature and the temperature difference between the main screen and the secondary screen;

[0050] Obtaining in real time from a locally stored temperature compensation table a voltage adjustment value corresponding to the temperature interval in which the screen temperature is located, and using the voltage adjustment value to adjust the voltage associated with the color coordinates of the pixels in the display module, so that the deviation of the color coordinate value of the displayed image compared with the preset color coordinate value within a preset time period after the display module is turned on is less than or equal to 10‰; wherein, the temperature compensation table stores the voltage adjustment value corresponding to each temperature interval of the display module from room temperature to a stable operating temperature, and the preset time period is the time period corresponding to the time when the display module is turned on to the time when the operating temperature of the display module is stable.

[0051] In one possible implementation, before measuring the operating temperature of the display module, the method further includes:

[0052] The screen of the main screen rises from the room temperature when the device is turned on to the sample temperature at which the operating temperature is stable;

[0053] Dividing the stable temperature range from room temperature to the operating temperature into a plurality of continuous temperature intervals;

[0054] Adjusting the voltage associated with the color coordinates in the corresponding temperature interval according to the color coordinates corresponding to each temperature interval until the deviation of the color coordinate value of the display module in the corresponding temperature interval from the preset color coordinate value is less than or equal to 10‰;

[0055] The voltage adjustment value associated with the color coordinate corresponding to each temperature interval is recorded to obtain the temperature compensation table.

[0056] In one possible implementation, the stable temperature range from room temperature to the operating temperature is divided into a plurality of continuous temperature intervals, including:

[0057] Constructing a corresponding temperature-time curve according to the sample temperature of the main screen rising from room temperature when the screen is turned on to a stable operating temperature;

[0058] The temperature range from the time of power-on to the time when the operating temperature stabilizes is divided into a sudden change stage and a plateau stage according to the temperature-time curve; wherein the rate of change of the sample temperature in the sudden change stage is greater than a first preset rate of change, and the rate of change of the sample temperature in the plateau stage is less than a second preset rate of change;

[0059] The mutation phase is divided into a plurality of temperature intervals having a first length, and the platform phase is divided into a plurality of second temperature intervals having a second length; wherein the first length is smaller than the second length.

[0060] In one possible implementation, the stable temperature range from room temperature to the operating temperature is divided into a plurality of continuous temperature intervals, including:

[0061] The temperature section is divided into a plurality of temperature intervals of equal length.

[0062] A possible implementation further includes:

[0063] Obtaining the sample temperature of the secondary screen from the room temperature when the secondary screen is turned on to the temperature when the secondary screen is stable;

[0064] Determining a temperature difference between the main screen and the secondary screen based on the sample temperature of the main screen and the sample temperature of the secondary screen;

[0065] According to the sample temperature of the secondary screen and the corresponding temperature difference value, a corresponding relationship table between the temperature range of the secondary screen and the temperature difference value is constructed.

[0066] In a third aspect, an embodiment of the present disclosure provides a display device comprising the display module as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] FIG1 is a color coordinate drift curve diagram of a stacked screen in the related art;

[0068] FIG2 is a schematic structural diagram of a display module provided by an embodiment of the present disclosure;

[0069] FIG3 is a schematic diagram of setting sampling points on a screen surface according to an embodiment of the present disclosure;

[0070] FIG4 is a temperature-time curve diagram provided by an embodiment of the present disclosure;

[0071] FIG5 is a schematic diagram of temperature compensation of a display module provided by an embodiment of the present disclosure;

[0072] FIG6 is a comparison diagram of the temperature-color coordinate abscissa curves before and after compensation provided by an embodiment of the present disclosure;

[0073] FIG7 is a comparison diagram of the temperature-color coordinate ordinate curves before and after compensation provided by an embodiment of the present disclosure;

[0074] FIG8 is a schematic structural diagram of a temperature compensation system provided by an embodiment of the present disclosure;

[0075] FIG9 is a schematic structural diagram of another display module provided by an embodiment of the present disclosure;

[0076] FIG10 is a schematic structural diagram of another display module provided by an embodiment of the present disclosure;

[0077] FIG11 is a comparison diagram of Wx changes with temperature for a fluorescence-based backlight module and a quantum dot-based backlight module provided in an embodiment of the present disclosure;

[0078] FIG12 is a graph showing the temperature change of Wy of a quantum dot-based backlight module according to an embodiment of the present disclosure;

[0079] FIG13 is a graph showing the temperature change of Wy of a fluorescence-based backlight module according to an embodiment of the present disclosure;

[0080] FIG14 is a diagram showing the division of backlight color blocks of a fluorescence-based backlight module;

[0081] FIG15 is a schematic structural diagram of a sub-array substrate provided in an embodiment of the present disclosure;

[0082] FIG16 is a schematic diagram of a pixel region in a sub-array substrate provided by an embodiment of the present disclosure;

[0083] FIG17 is a schematic diagram of the same pixel area corresponding to FIG16 in the main array substrate provided by an embodiment of the present disclosure;

[0084] FIG18 is a top view of a secondary common electrode provided by an embodiment of the present disclosure;

[0085] FIG19 is a top view of a secondary array substrate in the related art;

[0086] FIG20 is a top view of a secondary black matrix provided in an embodiment of the present disclosure;

[0087] FIG21 is a schematic diagram of a secondary black matrix provided by an embodiment of the present disclosure after being projected onto an array substrate;

[0088] FIG22 is a cross-sectional view taken along the line AA′ in FIG21 according to an embodiment of the present disclosure;

[0089] FIG23 is a cross-sectional view taken along line BB' in FIG21 according to an embodiment of the present disclosure;

[0090] FIG24 is a top view of the original secondary black matrix in the secondary screen in the related art;

[0091] FIG25 is a schematic structural diagram of a main color filter substrate provided by an embodiment of the present disclosure;

[0092] FIG26 is a schematic structural diagram of another main color filter substrate provided by an embodiment of the present disclosure;

[0093] FIG27 is a schematic diagram of the position of a carrier in the related art;

[0094] FIG28 is a partial enlarged view of the portion indicated by the dotted line in FIG27 ;

[0095] FIG29 is a schematic diagram of projecting an original main black matrix onto an array substrate in the related art;

[0096] FIG30 is a schematic diagram of the structure of a main array substrate provided by an embodiment of the present disclosure;

[0097] FIG31 is an enlarged view of the portion within the thick dashed line frame in FIG30 provided in an embodiment of the present disclosure;

[0098] FIG32 is a schematic diagram of projecting a main black matrix onto a main array substrate according to an embodiment of the present disclosure;

[0099] FIG33 is a cross-sectional view of the main screen corresponding to the CC' position in FIG31 according to an embodiment of the present disclosure;

[0100] FIG34 is a cross-sectional view of the DD' position in FIG32 provided by an embodiment of the present disclosure;

[0101] FIG35 is a flowchart of a method for controlling a display module provided in an embodiment of the present disclosure.

[0102] Main screen 1, sub-screen 2, temperature sensor 3, main array substrate 11, main color filter substrate 12, main liquid crystal layer 13, sub-array substrate 21, sub-color filter substrate 22, sub-liquid crystal layer 23, backlight module 4, first sub-base substrate 210, sub-data line 211, sub-gate line 212, sub-pixel electrode 213, sub-pixel switch 214, sub-common electrode 215, sub-common electrode line 216, sub-gate insulating layer 217, first sub-insulating layer 218, second sub-insulating layer 219, sub-black matrix 2 21, second sub-base substrate 220, main data line 111, main gate line 112, first connection hole 21a, color resist 121, high-transmittance polarizer 122, main gate line group 112D, main pixel electrode pair 113D, main pixel electrode 113, main common electrode line 114, spacer support 115, main common electrode 116, spacer 117, main black matrix 121, main pixel switch 118, auxiliary metal line 119, first main base substrate 110, second main base substrate 120;

[0103] Original secondary data line 211', original secondary gate line 212', original secondary common electrode line 216', original main array substrate 11', original main gate line group 112D', original main gate line 112', original main data line 111', original main pixel electrode pair 113D', original main pixel electrode 113', original main common electrode line 114', original isolation column carrier 115', original main common electrode 116', original isolation column 117', original main black matrix 121'. DETAILED DESCRIPTION

[0104] The embodiments of the present disclosure provide a display module, a control method thereof, and a display device to solve the problem of color coordinate shift in the prior art.

[0105] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0106] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in a variety of ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below. The subsequent description of the specification is a preferred embodiment of the present disclosure, but the description is for the purpose of illustrating the general principles of the present disclosure and is not intended to limit the scope of the present disclosure. The scope of protection of the present disclosure shall be as defined by the appended claims.

[0107] A display module, a control method thereof, and a display device provided by an embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0108] FIG2 is a schematic diagram of the structure of a display module provided in an embodiment of the present disclosure. The display module includes:

[0109] The main screen 1 and the secondary screen 2 are stacked;

[0110] The temperature sensor 3 is provided on the secondary screen 2 and is used to measure the working temperature of the secondary screen 2 at different times within a preset time period after the display module is turned on. The temperature sensor 3 can be provided outside the secondary screen 2 or inside the secondary screen 2, and the setting position usually corresponds to the center of the secondary screen 2. The temperature sensor 3 can be a thermocouple, a thermistor, etc. Among them, the preset time period is the time period corresponding to the power-on of the display module to the stabilization of the working temperature of the display module. If it takes 50 minutes for the working temperature to stabilize after the display module is turned on, the preset time period is 50 minutes after the power-on. If it takes 1 hour for the working temperature to stabilize after the display module is turned on, the preset time period is 1 hour after the power-on. The value used for the specific preset time period can be determined by measuring the display module in advance.

[0111] The controller (not shown) is used to determine the screen temperature corresponding to different times in a preset time period after the display module is turned on based on each operating temperature and the temperature difference between the surfaces of the secondary screen 2 and the main screen 1, and adjust the voltage related to the color coordinates of the pixel according to each screen temperature, so that the deviation of the color coordinate value of the display screen of the display module in the preset time period after the display module is turned on compared with the preset color coordinate value is less than or equal to 10‰.

[0112] The preset color coordinate value can be set according to the type of display module. For example, the industry standard stipulates that the color coordinate value corresponding to the display module of the monitor type is (0.313, 0.329), and the preset color coordinate value of the display module of the monitor type can be set to (0.313, 0.329); the color coordinate value corresponding to the display module of the television type is (0.280, 0.290), and the preset color coordinate value of the display module of the television type is (0.280, 0.290).

[0113] In the present disclosure, the voltage related to the color coordinates includes any one or any combination of a pixel voltage, a common voltage, and a gamma voltage.

[0114] Generally, the higher the operating temperature of the display module is above room temperature, the greater the amplitude of the color coordinate change will be, which will far exceed the design specifications of the display module. The present disclosure sets a temperature sensor 3 in the central area of ​​the secondary screen 2 to measure the operating temperature of the secondary screen 2 in real time, and calculates the screen temperature corresponding to the main screen 1 (i.e., the screen temperature of the display module) through the controller based on the real-time measured operating temperature and the temperature difference between the main screen 1 and the secondary screen 2. Then, the voltage related to the color coordinate of the pixel (such as pixel voltage, common voltage, gamma voltage, etc.) is adjusted in real time according to the real-time calculated screen temperature, so that the deviation of the color coordinate value of the display module from the preset color coordinate value is less than or equal to 10‰.

[0115] Taking the voltage related to the color coordinates of the pixel as the pixel voltage as an example, please refer to Table 2 for the operating temperature of the secondary screen 2 and the temperature difference between the secondary screen 2 and the main screen 1 measured at three times after the display module provided by the present invention is turned on (when the power is turned on, 20 minutes after the power is turned on, and 50 minutes after the power is turned on), and the corresponding voltage adjustment value of the pixel voltage.

[0116] Table 2

[0117] The screen temperature of the main screen 1 can be determined according to Table 2, and the voltage adjustment value of the pixel voltage corresponding to the screen temperature of the main screen 1 can be obtained by looking up the table, as shown in Table 3.

[0118] Table 3

[0119] Among them, V R 、V G 、V B Represents the pixel voltage (in V) of the red sub-pixel, green sub-pixel, and blue sub-pixel respectively. In Table 2, the main screen 1 and the sub-screen 2 correspond to a set of V R 、V G 、V B The value is the voltage adjustment value of the pixel voltage corresponding to the screen temperature. After determining the voltage adjustment value corresponding to the screen temperature, the controller can send the voltage adjustment value to the timing control board in the display module in real time. The timing control board transmits the voltage adjustment value to the display panels corresponding to the main screen 1 and the sub-screen 2 in the display module for use.

[0120] The color coordinate values ​​corresponding to the adjusted pixel voltage and the unadjusted pixel voltage in Table 3 are respectively measured at the three times in Table 3, as shown in Table 4:

[0121] Table 4

[0122] Among them, when the main screen does not adjust the pixel voltage, V R 、V G 、V B The value of is 13.886V. When the sub-screen does not adjust the pixel voltage, V R 、V G 、V B The value is 13.987V.

[0123] As can be seen from Table 4, the present disclosure adjusts the pixel voltage according to the screen temperature of the main screen 1, which can reduce the color deviation of the display module, so that the deviation of the color coordinate value of the display screen during the preset time period after the display module is turned on compared with the preset color coordinate value can be less than or equal to 10‰.

[0124] Similarly, when the voltage related to the color coordinate is any one of the pixel voltage, common voltage, and gamma voltage or any combination thereof, the deviation of the color coordinate value of the display screen displayed by the display module within a preset time period after power-on compared with the preset color coordinate value can be less than or equal to 10‰, which will not be repeated here.

[0125] In the embodiment provided by the present disclosure, by setting a temperature sensor 3 for measuring the working temperature of the secondary screen 2 in the display module, the working temperature of the secondary screen 2 can be obtained in real time during the preset time period from when the display module is turned on to when the working temperature stabilizes, and the controller is used to determine the screen temperature corresponding to different times in the preset time period after the display module is turned on according to each working temperature of the secondary screen 2 and the temperature difference between the surface of the secondary screen 2 and the main screen 1, and then adjust the voltage related to the color coordinates of the pixel according to each screen temperature, so that the deviation of the color coordinate value of the display screen of the display module compared with the preset color coordinate value in the preset time period after the display module is turned on is less than or equal to 10‰. Since the color coordinate value of the display module remains stable after the working temperature stabilizes, the solution provided by the present disclosure can make the color coordinate value of the display module always remain stable, which can effectively reduce the color coordinate offset of the stacked screen in the preset time period after the display is turned on, so that the color coordinate value of the stacked screen is basically consistent in the preset time period after the display is turned on, thereby making the color coordinates of the stacked screen always remain stable and improving the viewing experience.

[0126] In some embodiments, the controller is further configured to:

[0127] Determine the temperature range of each screen temperature; wherein the temperature range of the display module from room temperature at startup to stable operating temperature is divided into multiple continuous temperature ranges;

[0128] The voltage adjustment value corresponding to the temperature range of each screen temperature is selected to adjust the voltage related to the color coordinate, so that the deviation of the color coordinate value of the display screen of the display module in the preset time period after power on is less than or equal to 10‰ compared with the preset color coordinate value.

[0129] The multiple continuous temperature intervals are composed of multiple temperature intervals of equal length; or, the length of some temperature intervals in the multiple connected temperature intervals is the first length, and the length of another temperature interval is the second length; wherein the first length is smaller than the second length.

[0130] For example, the room temperature of the environment where the display module is turned on is 25°C, and the operating temperature of the display module is stable at around 45°C for a period of time after the display module is turned on. The time period from the display module being turned on to the operating temperature being stable at 45°C is the preset time period, and the temperature section from 25°C to 45 is divided into multiple temperature intervals of equal length, such as a length of 1°C, 2°C, 3°C, or 5°C.

[0131] Alternatively, the mutation stage of rapid temperature change in the temperature range of 25°C to 45°C is divided into multiple temperature intervals according to the first length, and the platform stage after the temperature stabilizes is divided into multiple intervals according to the second length. For example, if the mutation stage is 25-40°C and the first length is 1°C, the mutation stage can be divided into 15 temperature intervals. If the platform stage is 40-45°C and the second length is 3°C, the platform stage can be divided into 2 temperature intervals.

[0132] For example, when the power is turned on (recorded as time 1), the temperature sensor 3 measures the working temperature of the secondary screen 2 to be 26.14°C, and the temperature difference between the main screen 1 and the secondary screen 2 is 1°C. The current corresponding screen temperature is 25.14°C, which is in the temperature range of 24 to 25°C in the mutation stage. The controller can determine that the gamma voltage value 1 needs to be used to adjust the gamma voltage in the temperature range of 24 to 25°C by looking up the table (temperature compensation table), and then adjust the corresponding gamma voltage with the gamma voltage value 1 so that the deviation of the color coordinate value of the display module compared with the preset color coordinate value (0.313, 0.329) is less than or equal to 10‰; 20 minutes after the power is turned on (recorded as time 2), the temperature sensor 3 measures the working temperature of the secondary screen 2 to be 47.02°C, and the temperature difference between the main screen 1 and the secondary screen 2 is 6°C. The current corresponding screen temperature is 41.02°C, which is in the temperature range of 40 to 43°C in the platform stage. The controller can determine that the gamma voltage value 1 needs to be used to adjust the gamma voltage in the temperature range of 24 to 25°C by looking up the table (temperature compensation table). 3. The controller can determine that the gamma voltage value 2 needs to be used to adjust the gamma voltage in the temperature range of 40 to 43°C, and then use the gamma voltage value 2 to adjust the corresponding gamma voltage so that the color coordinate value of the display module deviates from the preset color coordinate value (0.313, 0.329) by less than or equal to 10‰; 50 minutes after power-on (recorded as time 3), the temperature sensor 3 measures the operating temperature of the secondary screen 2 to be 55.59 degrees Celsius, and the temperature difference between the main screen 1 and the secondary screen 2 is 11°C. The current corresponding screen temperature is 44.59°C, which is in the temperature range of 43 to 46°C in the platform stage. The controller can determine that the gamma voltage value 3 needs to be used to adjust the gamma voltage in the temperature range of 43 to 46°C by looking up the table (temperature compensation table), and then use the gamma voltage value 3 to adjust the corresponding gamma voltage so that the color coordinate value of the display module deviates from the preset color coordinate value (0.313, 0.329) by less than or equal to 10‰.

[0133] The above temperature compensation table can be obtained in the following ways:

[0134] As shown in Figure 3, 9 sampling points (denoted as P1 to P9, and the temperature of the 9 sampling points can be measured using thermocouples) can be set on the screen surface of the main screen 1 to collect the screen temperature of the display module; among them, the sampling point (P1) located in the center of the screen is taken as the standard, and the remaining sampling points are used as reference.

[0135] Assume that the main screen 1 has a length of H and a width of V. The sampling point at the center of the screen is designated P1. The remaining sampling points are located above, below, to the left, and right of P1, as well as at the four diagonal corners of the screen. P5 and P6 are located at a distance of H / 10 from the shortest edge of the screen and are located at the centerline of the two long edges. P3 and P8 are located at a distance of V / 10 from the long edge of the screen and are located at the centerline of the two short edges. The sampling points at the four diagonal corners (P2, P7, P4, and P9) are located at a distance of H / 10 from the shortest edge and V / 10 from the long edge. If the temperature measured by the sampling points around P1 differs significantly from the temperature measured by P1, the temperature measured by P1 can be adjusted appropriately.

[0136] From the time the display module is powered on until the operating temperature stabilizes, the temperature of nine sample points is continuously sampled. The sampling time can be set to 2 minutes, for example. After sampling is complete, a temperature-time curve is plotted based on the temperature measured at sample point P1, as shown in Figure 4. As can be seen from Figure 4, the screen temperature of main screen 1 rises from room temperature, 25°C, to approximately 45°C, where it stabilizes. The temperature changes rapidly before 40°C and more slowly after 40°C. Therefore, the period before 40°C can be called the sudden change phase, and the period after 40°C can be called the plateau phase.

[0137] During the temperature measurement process from P1 to P9 (i.e., within the preset time period), optical equipment is used to simultaneously collect the color coordinate values ​​of the display module and plot a color coordinate-time curve. Furthermore, the temperature sensor 3 in the secondary screen 2 is used to measure the temperature of the secondary screen 2 and determine the temperature difference between the main screen 1 and the secondary screen 2. A temperature-color coordinate curve is then obtained based on the temperature-time curve and the color coordinate-time curve.

[0138] The temperature range of 25℃~40℃ is divided into 15 intervals at 1℃ / interval, and the temperature range of 40℃~45℃ is divided into 5 intervals at 2℃ / interval.

[0139] Based on the color coordinate values ​​corresponding to different temperature ranges, adjust the voltages related to the color coordinates (such as gamma voltage, common voltage, pixel voltage, etc.) so that the deviation of the color coordinate values ​​of the display module from the preset color coordinate values ​​is less than or equal to 10‰. Record the voltage adjustment values ​​corresponding to each temperature range to construct a temperature compensation table. At the same time, calculate and record the temperature difference between the main screen 1 and the auxiliary screen 2 in each temperature range, as well as the temperature range corresponding to the auxiliary screen 2.

[0140] After being officially put into use, the controller can obtain the working temperature of the secondary screen 2 in real time based on the temperature sensor 3 set in the secondary screen 2, and can determine the temperature difference between the main screen 1 and the secondary screen 2 based on the temperature range of the working temperature of the secondary screen 2 measured in real time, and then determine the screen temperature of the main screen 1 based on the temperature difference between the main screen 1 and the secondary screen 2 and the working temperature of the secondary screen 2.

[0141] Then, based on the screen temperature, the voltage adjustment value related to the color coordinate is determined from the temperature lookup table to adjust the corresponding voltage so that the deviation of the color coordinate value of the display module from the preset color coordinate value is less than or equal to 10‰. As shown in Figure 5, a temperature compensation schematic diagram of a display module provided by an embodiment of the present disclosure is shown. Please refer to Table 5 for a comparison table of color coordinate drift before and after temperature compensation of the display module provided by an embodiment of the present disclosure. It can be seen from Table 2 that when the display module rises from room temperature after power-on to 45.8°C, after temperature compensation, the Wx change amplitude |ΔWx| decreases from 21‰ to 5‰, and the Wy change amplitude |ΔWy| decreases from 10‰ to 1‰. As shown in Figures 6 and 7, Figure 6 is a comparison diagram of the temperature-color coordinate horizontal coordinate curve before and after compensation provided by an embodiment of the present disclosure, and Figure 7 is a comparison diagram of the temperature-color coordinate vertical coordinate curve before and after compensation provided by an embodiment of the present disclosure. Wherein, Wx is the horizontal coordinate in the color coordinate, and Wy is the vertical coordinate in the color coordinate.

[0142] Table 5

[0143] The above-mentioned temperature compensation scheme can be referred to as a temperature compensation system. FIG8 is a schematic diagram of the structure of a temperature compensation system provided in an embodiment of the present disclosure. The temperature compensation system includes:

[0144] The temperature detection module S1 is used to detect the operating temperature of the secondary screen 2 through the temperature sensor 3;

[0145] The temperature conversion module S2 is used to determine the screen temperature of the display module according to the operating temperature and the temperature difference between the main screen 1 and the auxiliary screen 2;

[0146] The control module S3 is used to determine the voltage adjustment value corresponding to the color coordinate according to the screen temperature;

[0147] The operation module S4 is configured to adjust the voltage corresponding to the color coordinate according to the voltage adjustment value, so that the deviation of the color coordinate value of the display module from the preset color coordinate value is less than or equal to 10‰.

[0148] As shown in Figure 1, the same liquid crystal exhibits different parameters at different temperatures. During use, as the operating temperature rises from room temperature to elevated temperatures, the color temperature and transmittance of the liquid crystal change significantly. In the embodiments provided herein, to improve the optical stability of display products, highly stable liquid crystals are used. Liquid crystal parameters exhibit minimal temperature variations. Specifically, highly stable liquid crystals exhibit high-definition highlights and minimal temperature variations in birefringence.

[0149] Please refer to FIG9 which is a schematic structural diagram of another display module provided in an embodiment of the present disclosure.

[0150] The main screen 1 includes a main array substrate 11 and a main color filter substrate 12 that are arranged opposite to each other, and a main liquid crystal layer 13 located between the main array substrate 11 and the main color filter substrate 12;

[0151] The secondary screen 2 includes a secondary array substrate 21 and a secondary color filter substrate 22 that are arranged opposite to each other, and a secondary liquid crystal layer 23 located between the secondary array substrate 21 and the secondary color filter substrate 22;

[0152] The main liquid crystal layer 13 uses wide-temperature liquid crystal; since the temperature of the main liquid crystal layer 13 is usually high, the main liquid crystal layer 13 is set to a wide-temperature liquid crystal with high-definition bright spots and a small change in birefringence with temperature. This can improve the stability of the main liquid crystal layer 13 under high-temperature operation, thereby improving the optical stability of the main screen 1 and improving color deviation.

[0153] The sub-liquid crystal layer 23 is made of negative liquid crystal.

[0154] In this disclosure, the clearing point of wide-temperature liquid crystals and negative liquid crystals must be greater than or equal to 90°C. The change in birefringence (denoted as Δn) of the wide-temperature liquid crystals and negative liquid crystals from room temperature to 45°C must be less than or equal to 10%. The transmittance of the negative liquid crystals (Δn × LCD cell thickness) must be ≥ 330%.

[0155] The physical properties of liquid crystals (such as birefringence Δn, dielectric constant ε, elastic constant K, and viscosity γ) determine the optical specifications of the product. See Tables 6-8. Table 6 compares the physical properties of conventional and wide-temperature liquid crystals at different temperatures, as provided in the embodiments of the present disclosure. Table 7 compares the physical properties of different types of liquid crystals, as provided in the embodiments of the present disclosure. Table 8 shows the level of isochromatic coordinate drift of liquid crystal parameters, as provided in the embodiments of the present disclosure.

[0156] Table 6

[0157] Table 7

[0158] Table 8

[0159] Where: ne represents the extraordinary refractive index (light with a vibration direction parallel to the optical axis is extraordinary light), no represents the normal refractive index (light with a vibration direction perpendicular to the optical axis is normal light), Δn represents the birefringence (Δn = ne - no), ε‖ represents the dielectric constant in the long-axis direction of the liquid crystal, ε⊥ represents the dielectric constant in the uniaxial direction of the liquid crystal, Δε represents the dielectric anisotropy (Δε = ε‖ - ε⊥), k11 represents the splay elastic coefficient, k22 represents the torsion elastic coefficient, k33 represents the bending elastic coefficient, γ1 represents the rotational viscosity, Density represents the liquid crystal density, LTS represents the liquid crystal crystallization temperature, and Tni represents the liquid crystal clearing point. In Table 4, Δ(Δn25°C - Δn45°C) represents the difference between Δn at 25°C and Δn at 45°C. Δ(Δn25°C - Δn45°C)% = (Δ(Δn25°C - Δn45°C) / Δn25°C) × 100%.

[0160] It can be seen from Table 6 that the amplitude of the birefringence change with temperature of the wide-temperature liquid crystal is smaller than that of the conventional liquid crystal. It can be seen from Table 7 that the clearing point of the wide-temperature liquid crystal is higher than that of the conventional liquid crystal. Therefore, the wide-temperature liquid crystal has the characteristics of high-definition bright spots and small amplitude of birefringence change with temperature. Combined with Table 8, the color coordinates and brightness changes corresponding to five liquid crystals with different clearing points and birefringence are shown. Among them, the 3# liquid crystal has the highest clearing point and the highest birefringence, and the corresponding color coordinate change amplitude and brightness change amplitude are the smallest. Therefore, the main liquid crystal layer 13 uses a wide-temperature liquid crystal with high-definition bright spots and small amplitude of birefringence change with temperature, which can effectively improve the optical stability of the main screen 1 and thus improve color deviation.

[0161] Since the display module provided by the present disclosure is a stacked screen product consisting of a main screen 1 and a sub-screen 2, it is a high-brightness product. The transmittance of a high-brightness product is proportional to the module brightness and inversely proportional to the backlight brightness. Therefore, the smaller the transmittance of the high-brightness product, the higher the backlight brightness, the greater the backlight current, and the more heat is generated, resulting in a higher operating temperature of the high-brightness product. As can be seen from Table 6, when the operating temperature of the liquid crystal is closer to room temperature, the smaller the change in the liquid crystal parameters, the more stable the corresponding optical performance. In the embodiment provided by the present disclosure, the sub-screen 2 is closer to the backlight than the main screen 1. Therefore, the backlight current is reduced by increasing the transmittance of the sub-liquid crystal layer 23 in the sub-screen 2, thereby achieving the purpose of improving optical stability by reducing the operating temperature of the sub-liquid crystal layer 23. Please continue to refer to Table 7. It can be seen from Table 7 that the wide-temperature liquid crystal has the highest clearing point, and the high-Tni negative liquid crystal has a relatively high clearing point. Negative liquid crystal has a higher transmittance than positive liquid crystal, and the wide-temperature liquid crystal belongs to positive liquid crystal. Therefore, the secondary liquid crystal layer 23 uses negative liquid crystal with high transmittance and high clearing point (i.e., high-Tni negative liquid crystal), and the main liquid crystal layer 13 uses wide-temperature liquid crystal with good stability and high clearing point.

[0162] In some embodiments, the wide-temperature liquid crystal used in the main liquid crystal layer 13 has a clearing point greater than or equal to 95°C, a birefringence greater than or equal to 0.098, and a variation in birefringence with temperature of less than 7% in the range of 25°C to 45°C. This allows the main liquid crystal layer 13 to still have high optical stability even when operating at around 45°C, thereby improving color deviation.

[0163] It should be understood that in actual applications, the liquid crystal scheme used by the main liquid crystal layer 13 and the auxiliary liquid crystal layer 23 is first determined, and finally the temperature sensor 3 and controller described above are used to implement temperature compensation to further improve the color deviation of the display module. For example, if the main liquid crystal layer 13 uses wide-temperature liquid crystal, the auxiliary liquid crystal layer 23 uses negative liquid crystal, and the color filter uses 03R / G7700 / B7200 (color filter model), after forming the display module, it is necessary to first collect the changes in color coordinates at different temperatures and construct a temperature-color coordinate curve without temperature compensation as shown in Figures 6 and 7. Then, using the thermocouple arranged on the surface of the main screen 1 and the temperature sensor 3 arranged in the auxiliary screen 2, the temperature difference between the main screen 1 and the auxiliary screen 2 from power-on (room temperature) to stable operating temperature is measured. The temperature range from room temperature to stable operating temperature is divided into multiple temperature intervals, and the adjustment value of the voltage related to the color coordinate corresponding to each temperature interval is determined to construct temperature compensation. After the display module is officially put into use, the temperature sensor 3 set in the auxiliary screen 2 is used to measure the operating temperature, and then the screen temperature and the voltage adjustment value corresponding to the temperature range are determined. The determined voltage adjustment value is transmitted to the timing control board in the display module to adjust the voltage related to the color coordinate so that the deviation of the color coordinate value of the display module compared to the preset color coordinate value is less than or equal to 10‰. Through testing, the above-mentioned display module using wide-temperature liquid crystal for the main liquid crystal layer 13, negative liquid crystal for the auxiliary liquid crystal layer 23, and 03R / G7700 / B7200 color filter is found. After powering on, during the process of the operating temperature rising from room temperature to the stable operating temperature (45.8°C), after using temperature compensation, the Wx change amplitude |△Wx| is reduced from 21‰ to 5‰, and the Wy change amplitude |△Wy| is reduced from 10‰ to 1‰.

[0164] Please refer to FIG10 which is a schematic structural diagram of another display module provided in an embodiment of the present disclosure.

[0165] The display module also includes:

[0166] The high temperature resistant backlight module 4 is located on the side of the secondary screen 2 away from the main screen 1; wherein, when the working temperature of the high temperature resistant backlight module 4 rises from room temperature to 45°C, the change amplitude of the color coordinates of the backlight module 4 is less than or equal to the preset amplitude.

[0167] The high temperature resistant backlight module 4 can be a fluorescent backlight module or a quantum dot backlight module. The preset amplitude corresponding to the fluorescent backlight module is 4‰, and the preset amplitude corresponding to the quantum dot backlight module is 11‰.

[0168] Setting the high-temperature resistant backlight module 4 to a fluorescence-based backlight module 4 or a quantum dot-based backlight module 4 can improve the color gamut of the display module.

[0169] Please refer to Table 9 for a comparison table of the color coordinate drift levels of the fluorescence-based backlight module 4 and the quantum dot-based backlight module 4 provided in the embodiment of the present disclosure.

[0170] Table 9

[0171] As can be seen from Table 9, when equipped with a fluorescent backlight module 4 and a quantum dot backlight module 4, under the condition of comparable temperature differences, the Wx variation amplitude |ΔWx| of the fluorescent backlight module 4 is 4‰, and the Wy variation amplitude |ΔWy| is 4‰. The Wx variation amplitude |ΔWx| of the quantum dot backlight module 4 is 11‰ and the Wy variation amplitude |ΔWy| is 5‰. Therefore, the color coordinate shift of the fluorescent backlight module 4 is smaller, which can better improve the color coordinate shift of the display module. As shown in Figures 11 to 13, Figure 11 is a comparison of the Wx variation of the fluorescent backlight module and the quantum dot backlight module provided in an embodiment of the present disclosure with temperature, Figure 12 is a curve chart of the Wy variation of the quantum dot backlight module provided in an embodiment of the present disclosure, and Figure 13 is a curve chart of the Wy variation of the fluorescent backlight module provided in an embodiment of the present disclosure. Among them, the backlight color block division diagram of the fluorescence-based backlight module 4 is shown in Figure 14. In the embodiment provided in the present disclosure, the backlight color block selected for the fluorescence-based backlight module 4 is MND (as shown by the dotted circle in Figure 14), the brightness is 23lm@60mA, the chip wavelength is 540nm, and CIE-X is the horizontal axis color coordinate, CIE-Y is the vertical axis color coordinate, K~P is the color block horizontal axis number, Y~I is the color block vertical axis number, and KL~OP is the subdivision number of the color block horizontal axis.

[0172] In the embodiment provided in the present disclosure, by setting the backlight module 4 in the display module to be a high-temperature resistant backlight module 4 so that the change amplitude of the color coordinates of the backlight module 4 is less than or equal to a preset amplitude during the process of the operating temperature rising from room temperature to 45°C, the color coordinate offset of the backlight module 4 can be reduced, thereby improving the color coordinate offset of the display module.

[0173] FIG15 is a schematic structural diagram of a secondary array substrate provided in an embodiment of the present disclosure. The secondary array substrate 21 includes:

[0174] A plurality of auxiliary data lines 211 and a plurality of auxiliary gate lines 212; the plurality of auxiliary data lines 211 and the plurality of auxiliary gate lines 212 intersect to define a plurality of pixel areas P, the pixel areas P correspond one-to-one to the pixel areas P' in the main screen 1, and the pixel area P' of the main screen includes a plurality of sub-pixel areas p; as shown in Figures 16 and 17, Figure 16 is a schematic diagram of a pixel area in the auxiliary array substrate provided in an embodiment of the present disclosure, and Figure 17 is a schematic diagram of the same pixel area corresponding to Figure 16 in the main array substrate provided in an embodiment of the present disclosure. For ease of viewing, only the auxiliary data lines 211 and the auxiliary gate lines 212 are shown in Figure 16, and only the main data lines 111 and the main gate lines 112 are shown in Figure 17. In Figure 17, one pixel area P' includes three sub-pixel areas p', and each sub-pixel area p' corresponds to a sub-pixel of one color, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel.

[0175] A plurality of sub-pixel electrodes 213 corresponding to the plurality of pixel regions P on a one-to-one basis;

[0176] The plurality of sub-pixel switches 214 have gates electrically connected to the sub-gate line 212 , first electrodes connected to the sub-data line 211 , and second electrodes connected to the sub-pixel electrode 213 .

[0177] If the secondary array substrate 21 also sets multiple sub-pixel areas p' in each pixel area P' like the main array substrate, then the data lines controlling the sub-pixel areas p' will inevitably be increased, which will cause the pixel areas P in the secondary array substrate 21 to be blocked by more data lines. The present disclosure provides a secondary pixel electrode 213 and a corresponding data line for each pixel area P in the secondary array substrate 21, thereby reducing the number of secondary data lines 211 blocking the pixel areas P in the secondary array substrate 21 and improving the transmittance of the pixel areas P.

[0178] It should be understood that the light emitted by the secondary screen 2 is consistent with the color of the backlight, that is, no color resist 121 is provided corresponding to each pixel area P in the secondary color filter substrate 22 of the secondary screen 2 .

[0179] Please refer to FIG18 , which is a top view of a secondary common electrode provided in an embodiment of the present disclosure. The secondary array substrate 21 further includes:

[0180] The sub-common electrode 215 and the sub-common electrode line 216 provided in the same layer are located on a side of the sub-pixel electrode 213 away from the main screen 1 , and the sub-common electrode line 216 is connected to an edge of the sub-common electrode 215 .

[0181] The sub-common electrode 215 has multiple opening grooves K. The orthographic projections of the sub-pixel switch 214 and the first connection hole 21a connecting the sub-pixel switch 214 and the corresponding sub-pixel electrode 213 are both located in the corresponding opening grooves K. The first connection hole 21a penetrates the film layer between the sub-pixel electrode 213 and the sub-common electrode 215.

[0182] Please refer to Figure 19 for a top view of the sub-array substrate in the related art. In the sub-array substrate 21 of the related art, the original sub-common electrode line 216' is set on the same layer as the original sub-gate line 212', which will block part of the pixel area P. The embodiment provided by the present disclosure removes the original sub-common electrode line 216' set on the same layer as the original sub-gate line 212', sets the sub-common electrode line 216 on the same layer as the sub-common electrode 215, and directly connects the sub-common electrode line 216 to the edge of the sub-common electrode 215, thereby improving the light transmittance of the pixel area P and improving color deviation.

[0183] Please refer to Figures 20-21. Figure 20 is a top view of the secondary black matrix provided in an embodiment of the present disclosure. Figure 21 is a schematic diagram of the secondary black matrix provided in an embodiment of the present disclosure after being projected onto the array substrate. The secondary color filter substrate 22 includes a secondary black matrix 221.

[0184] The secondary black matrix 221 includes island structures corresponding to the plurality of secondary pixel switches 214 , and the island structures completely cover the corresponding secondary pixel switches 214 .

[0185] As shown in FIG21 , in the extension direction of the secondary data line 211, the distance d between the two edges of the island structure located on both sides of the secondary gate line 212 and the secondary pixel switches 214 covered is the same; in the extension direction of the secondary gate line 212, the distance between the side of the island structure away from the first connection hole 21a and the secondary data line 211 connected to the corresponding secondary pixel switch 214 is also d.

[0186] Please refer to Figures 22 and 23. Figure 22 is a cross-sectional view taken along the AA' direction in Figure 21 according to an embodiment of the present disclosure. Figure 23 is a cross-sectional view taken along the BB' direction in Figure 21 according to an embodiment of the present disclosure.

[0187] The secondary array substrate 21 includes:

[0188] a first sub-base substrate 210;

[0189] A secondary gate line 212 is located on one side of the first secondary substrate 210;

[0190] The secondary gate insulating layer 217 is located on a side of the secondary gate line 212 away from the first secondary substrate 210 ;

[0191] The auxiliary data line 211 is located on the side of the auxiliary gate insulating layer 217 away from the first auxiliary base substrate 210; the source 214S of the auxiliary pixel switch 214 is disposed on the same layer as the auxiliary data line 211;

[0192] A first secondary insulating layer 218 is located on a side of the secondary data line 211 away from the first secondary base substrate 210 ;

[0193] The auxiliary common electrode 215 is located on a side of the first auxiliary insulating layer 218 away from the first auxiliary base substrate 210 ;

[0194] The second sub-insulating layer 219 is located on a side of the sub-common electrode 215 away from the first sub-base substrate 210 ;

[0195] The sub-pixel electrode 213 is located on a side of the second sub-insulating layer 219 away from the first sub-base substrate 210 , and a first connection hole 21 a is provided between the source 214S of the sub-pixel switch 214 and the sub-pixel electrode 213 , penetrating the film layer between the source 214S of the sub-pixel switch 214 and the sub-pixel electrode 213 .

[0196] The auxiliary color filter substrate 22 includes a second auxiliary base substrate 220 and an auxiliary black matrix 221 . The auxiliary black matrix 221 is located on a side of the second auxiliary color filter substrate 22 close to the auxiliary array substrate 21 .

[0197] As shown in FIG. 21 and FIG. 22 , the secondary data line 211 between two adjacent secondary pixel switches 214 is not covered by the secondary black matrix 221 ; as shown in FIG. 21 and FIG. 23 , the secondary black matrix 221 covers the secondary pixel switches 214 .

[0198] It should be understood that, in order to facilitate observation of the relationship between the secondary black matrix 221 and the secondary pixel switches 214 , only the outline of the secondary black matrix 221 is retained in FIG. 22 .

[0199] Please refer to Figure 24 which is a top view of the original secondary black matrix in the secondary screen in the related art. It can be seen from Figure 24 that the original secondary black matrix in the secondary screen 2 in the related art is a mesh structure. The part of the mesh structure covering the original secondary data line 211' and the part of the secondary gate line 212 will block the pixel area P, thereby reducing the light transmittance of the pixel area P in the secondary screen 2. The present disclosure can effectively improve the light transmittance of the pixel area P by setting the secondary black matrix 221 to an island structure covering the secondary pixel switch 214, thereby improving color deviation.

[0200] Please refer to FIG25 for a structural diagram of a main color filter substrate provided in an embodiment of the present disclosure. The main color filter substrate 12 includes:

[0201] A plurality of color resists 121 are provided, wherein the color resists 121 are high-transmittance color resists 121 having a light transmittance greater than a preset light transmittance.

[0202] Each color resist 121 corresponds to a sub-pixel region p′. As shown in FIG. 24 , the three color resists 121 of R, G, and B correspond to a pixel region P.

[0203] Under light source C, the preset transmittances for the 2.2µm thick R, G, and B color resists are 21%, 68%, and 8.5%, respectively. Generally, as the thickness of the color resist increases, its transmittance decreases, so the preset transmittances for the above color resists will vary with thickness.

[0204] In the embodiment provided in the present disclosure, by setting the color resist 121 in the main color filter substrate 12 to a high-transmittance color resist 121 with a transmittance greater than a preset transmittance, the light transmittance of the main screen 1 can be increased, thereby improving color deviation.

[0205] Please refer to FIG. 26 for a structural diagram of another main color filter substrate provided in an embodiment of the present disclosure. The main color filter substrate 12 further includes:

[0206] The high-transmittance polarizer 122 is located on a side of the plurality of color resists 121 away from the main array substrate 11 . The single-piece light transmittance of the high-transmittance polarizer 122 is greater than or equal to 42.7%.

[0207] In the embodiment provided in the present disclosure, by disposing a high-transmittance polarizing film 122 with a single transmittance greater than or equal to 42.7% in the main color filter substrate 12, the light transmittance of the main screen 1 can be effectively improved, thereby improving color deviation.

[0208] In the embodiments provided herein, the pixels in the main array substrate 11 can adopt a single-gate structure or a dual-gate structure. When the dual-gate structure is adopted, please refer to Figures 27 and 28 . Figure 27 is a schematic diagram of the position of the carrier in the related art, and Figure 28 is a partial enlarged view of the portion indicated by the dotted line in Figure 27 .

[0209] The original main array substrate 11' includes:

[0210] A plurality of original main gate line groups 112D' and a plurality of original main data lines 111';

[0211] a plurality of original main pixel electrode pairs 113D' located in an area defined by the intersection of the plurality of original main gate line groups 112D' and the plurality of original main data lines 111', the original main gate line group 112D' including two original main gate lines 112', the two original main gate lines 112' located on either side of the original main pixel electrode pair 113D' of the corresponding row, the original main pixel electrode pair 113D' including two original main pixel electrodes 113' arranged along an extension direction of the original main gate line 112', and the two original main gate lines 112' electrically connected to different original main pixel electrodes 113' in the original main pixel electrode pair 113D' of the corresponding row;

[0212] A plurality of original main common electrode lines 114 ′, which are provided in the same layer as the original main data lines 111 ′ and are located between two adjacent columns of original main pixel electrodes 113 ′ in a column of original main pixel electrode pairs 113D′;

[0213] The original main common electrode 116 ′ is located on a side of the original main common electrode line 114 ′ away from the original main pixel electrode 113 ′. The original main common electrode 116 ′ covers each row of original main pixel electrodes 113 ′ and each original main common electrode line 114 ′.

[0214] The original main common electrode line 114' located between two adjacent original main grid lines 112' is reused as the original isolation column platform 115'. The long side of the original isolation column platform 115' extends along the extension direction of the original main grid lines 112'. The length L1 of the original isolation column platform 115' in the extension direction of the original main grid lines 112' is greater than the length L2 of the original isolation column platform 115' in the extension direction of the original main data lines 111'. The original isolation column 117' is located on the side of the original main common electrode 116' away from the original main common electrode line 114', and the orthographic projection of the original isolation column 117' on the original isolation column platform 115' is located within the original isolation column platform 115'.

[0215] It should be noted that, in FIG. 28 , the film layer where the original main common electrode 116 ′ is located is removed for ease of viewing.

[0216] As can be seen from Figures 27 and 28, the original isolation column carrier 115' on which the original isolation column 117' is placed in the related art is usually set on the original main common electrode line 114' between two adjacent original main grid lines 112', and the original main common electrode line 114' is located between two adjacent original main data lines 111', which makes the widths of the two adjacent original main grid lines 112' larger, and the distance between the two adjacent original main grid lines 112' is also larger, and the corresponding width of the original main black matrix 121' is also larger (as shown in Figure 29, which is a schematic diagram of the original main black matrix in the related art projected onto the array substrate), resulting in low light transmittance of the main screen 1.

[0217] FIG30 is a schematic diagram of the structure of a main array substrate provided in an embodiment of the present disclosure. The main array substrate 11 includes:

[0218] A plurality of main gate line groups 112D and a plurality of main data lines 111;

[0219] A plurality of main pixel electrode pairs 113D are located in a plurality of areas defined by the intersection of a plurality of main gate line groups 112D and a plurality of main data lines 111. The main gate line group 112D includes two main gate lines 112, and the two main gate lines 112 are located on both sides of the main pixel electrode pair 113D in the corresponding row. The main pixel electrode pair 113D includes two main pixel electrodes 113 arranged along the extending direction of the main gate lines 112, and the two main gate lines 112 are electrically connected to different main pixel electrodes 113 in the main pixel electrode pair 113D in the corresponding row.

[0220] a plurality of main pixel switches 118, wherein a gate of the main pixel switch 118 is connected to a corresponding main gate line 112, a first electrode of the main pixel switch 118 is connected to a corresponding main data line 111, and a second electrode of the main pixel switch 118 is connected to a corresponding main pixel electrode 113;

[0221] A portion of the main data line 111 between two adjacent main pixel switches 118 connected to the same main data line 111 is reused as the isolation column support 115 . The extension direction of the long side of the isolation column support 115 is the same as that of the main data line 111 .

[0222] As shown in FIG30 , the main array substrate 11 further includes:

[0223] A plurality of isolation columns 117, each of the isolation columns 117 corresponds to the isolation column carrier 115;

[0224] The extending direction of the long side of the isolation pillar 117 is the same as the extending direction of the main data line 111 .

[0225] As shown in Figure 30, since the isolation column carrier 115 reuses the main data line 111, and the isolation column carrier 115 is located between two adjacent main pixel switches 118 connected to the same main data line 111, this can reduce the size of the space occupied by the main gate line 112, thereby reducing the line width of at least one main gate line 112, and then reducing the width of the main black matrix 121, thereby improving the pixel aperture ratio and light transmittance.

[0226] Please refer to Table 10 for a comparison table of solution parameters of the isolation column carrier 115 disclosed in the present invention and the original isolation column carrier 115 ′ in the related art.

[0227] Table 10

[0228] It should be noted that the isolation columns 117 in Table 10 include main isolation columns and auxiliary isolation columns. The orthographic projection of the main isolation columns on the main array substrate 11 is a circle, and the orthographic projection of the auxiliary isolation columns on the main array substrate 11 is a rectangle or a long hexagon.

[0229] As can be seen from Table 10, the transmittance of the design scheme of the isolation column carrier 115 provided by the present invention can increase the aperture ratio by 18% (that is, the transmittance is increased by 18%) compared with the design scheme of the original isolation column carrier 115' in the related art, and because the isolation column carrier 115 is set on the main data line 111, the support density of the isolation column 117 can also be guaranteed to remain unchanged.

[0230] Please refer to Figure 31, which is an enlarged view of the portion within the thick dotted frame in Figure 30 provided in an embodiment of the present disclosure. The main array substrate 11 also includes an auxiliary metal line 119, which is arranged in the same layer as the main pixel electrode 113. The auxiliary metal line 119 has the same shape as the main grid line 112, and the orthographic projection of the main grid line 112 on the film layer where the main pixel electrode 113 is located is located within the auxiliary metal line 119. By arranging the auxiliary metal line 119, which has the same shape as the main grid line 112 but is slightly larger, on the film layer where the main pixel electrode 113 is located, the auxiliary metal line 119 can be used to support the main grid line 112, thereby improving the flatness of the main grid line 112 and reducing the resistance of the main grid line 112.

[0231] Please refer to Figures 32 to 34. Figure 32 is a schematic diagram of the main black matrix projected onto the main array substrate provided in an embodiment of the present disclosure. Figure 33 is a cross-sectional view of the main screen corresponding to the CC' position in Figure 31 provided in an embodiment of the present disclosure. Figure 34 is a cross-sectional view of the DD' position in Figure 32 provided in an embodiment of the present disclosure.

[0232] As shown in Figures 32 and 33, the main black matrix 121 covers the area between two adjacent rows of main pixel electrodes 113 and the edges of two adjacent rows of main pixel electrodes 113. As shown in Figures 32 and 34, the main black matrix 121 also covers the main data lines 111 and the main common electrode lines 114.

[0233] As shown in Figure 33, the main pixel electrode 113 and the auxiliary metal line 119 arranged in the same layer are located on the side of the first main substrate 110 facing the main color filter substrate 12, the main gate line 112 is located on the side of the auxiliary metal line 119 away from the first main substrate 110, a gate insulation layer GI is provided on the side of the main gate line 112 away from the first main substrate 110, and an active layer A is provided on the side of the gate insulation layer GI away from the first main substrate 110. The main data line 111, the main common electrode line 114 and the source 128S of the main pixel switch 118 are located on the side of the active layer A away from the first main substrate 110. The pattern of the part where the active layer A overlaps with the main data line 111 is the same as the shape of the main data line 111, and the shape of the part where the active layer A overlaps with the source 128S of the main pixel switch 118 is the same as the shape of the source 128S. This facilitates the flatness of the main data line 111 and the source 128S of the main pixel switch 118 to be higher. An interlayer insulating layer IDL is disposed on a side of the main data line 111 away from the first main base substrate 110 , and the main common electrode 116 is located on a side of the interlayer insulating layer IDL away from the first main base substrate 110 .

[0234] Based on the same inventive concept, an embodiment of the present disclosure provides a control method based on the display module described above. For specific implementations, please refer to the relevant description of the display module described above, see FIG35 . The control method includes:

[0235] Step S11: After the display module is powered on, the operating temperature of the secondary screen in the display module is measured in real time;

[0236] Before measuring the operating temperature of the display module, it is necessary to obtain a temperature compensation table in advance and store the temperature compensation table in the display module for subsequent use. The temperature compensation table can be obtained in the following ways:

[0237] Collect sample temperatures of the secondary screen and the main screen from room temperature at startup to stable operating temperature, obtain the sample temperature of the main screen and the sample temperature of the secondary screen, and determine the temperature difference between the secondary screen and the main screen at each sampling time; based on the sample temperature of the secondary screen and the corresponding temperature difference value, construct a correspondence table between the temperature range and temperature difference value of the secondary screen.

[0238] Divide the main screen's temperature range from room temperature to stable operating temperature into multiple continuous temperature intervals;

[0239] Adjusting the voltage associated with the color coordinates in each temperature interval according to the color coordinates corresponding to each temperature interval until the color coordinate value of the display module in the corresponding temperature interval deviates from the preset color coordinate value by less than or equal to 10‰;

[0240] The voltage adjustment value related to the color coordinate corresponding to each temperature interval is recorded to obtain a temperature compensation table.

[0241] Collect sample temperatures and color coordinates from the time the display module is powered on until the operating temperature stabilizes. Furthermore, this data can be used to construct a temperature-time curve and a color coordinate-time curve before temperature compensation. Using these data, the temperature-time curve and the color coordinate-time curve can be used to obtain a temperature-color coordinate curve before temperature compensation. Subsequently, after temperature compensation, the same method can be used to obtain a temperature-color coordinate curve after temperature compensation. By comparing the temperature-color coordinate curves before and after temperature compensation, it can be determined that the color coordinate offset has been reduced after temperature compensation.

[0242] The temperature range from room temperature to stable operating temperature measured from the main screen is divided into multiple connected temperature intervals, and then the voltage related to the color coordinates (such as gamma voltage, common voltage, pixel voltage, etc.) corresponding to the color coordinate bars of each temperature interval is recorded until the color coordinates of the display module in the corresponding temperature interval are within the preset range. The voltage adjustment value related to the color coordinates corresponding to each temperature interval is recorded to obtain a temperature compensation table.

[0243] After the product including the table of correspondence between the temperature range and temperature difference value of the secondary screen and the temperature compensation table leaves the factory, steps S11 to S13 can be performed in actual work.

[0244] Step S12: determining the screen temperature of the display module in real time based on the operating temperature and the temperature difference between the main screen and the secondary screen;

[0245] Step S13: Obtain in real time the voltage adjustment value corresponding to the temperature range in which the screen temperature is located from a locally stored temperature compensation table, and use the voltage adjustment value to adjust the voltage related to the color coordinates of the pixels in the display module, so that the deviation of the color coordinate value of the display screen compared with the preset color coordinate value within a preset time period after the display module is turned on is less than or equal to 10‰; wherein, the temperature compensation table stores the voltage adjustment value corresponding to each temperature range of the display module from room temperature to the stable operating temperature, and the preset time period is the time period corresponding to the power-on of the display module to the stabilization of the operating temperature of the display module.

[0246] In actual operation, when the display module is turned on, it begins to measure the operating temperature of the secondary screen in real time, obtains the temperature difference value corresponding to the temperature range of the secondary screen's operating temperature from a pre-stored table, and then determines the screen temperature based on the obtained operating temperature and temperature difference value. Then, based on the temperature range of the screen temperature, the voltage adjustment value related to the color coordinate corresponding to the temperature range of the screen temperature is obtained from the temperature compensation table. The obtained voltage adjustment value is used to adjust the voltage related to the color coordinate of the pixel in the display module so that the deviation of the color coordinate value of the display module from the preset color coordinate value is less than or equal to 10‰. In this way, the color coordinates of the display module can always be kept within a deviation of 10‰ of the preset color coordinate value from the time of power-on to the stabilization of the operating temperature, thereby improving color coordinate drift.

[0247] In some embodiments, the temperature range from room temperature to the stable operating temperature is divided into multiple continuous temperature intervals, which can be implemented in the following two ways:

[0248] The first implementation method: construct a corresponding temperature-time curve based on the sample temperature of the main screen rising from room temperature when the power is turned on to the stable working temperature; divide the temperature section from when the power is turned on to when the working temperature is stable into a mutation stage and a platform stage according to the temperature-time curve; wherein, the rate of change of the sample temperature in the mutation stage is greater than a first preset rate of change, and the rate of change of the sample temperature in the platform stage is less than a second preset rate of change; divide the mutation stage into multiple temperature intervals with a first length, and divide the platform stage into multiple second temperature intervals with a second length; wherein, the first length is less than the second length.

[0249] For example, based on the sample temperature of the main screen rising from room temperature when the computer is turned on to the stable operating temperature, a corresponding temperature-time curve is constructed. Then, based on the temperature change rate in the temperature-time curve, the temperature range corresponding to the mutation stage and the temperature range corresponding to the platform stage are determined. Assuming that the first length is 1°C, the mutation stage is divided into multiple temperature intervals with an interval length of 1°C. Assuming that the second length is 3°C, the platform stage is divided into multiple temperature intervals with an interval length of 3°C.

[0250] By dividing the temperature section from power-on to stable operating temperature into a mutation stage and a platform stage according to the rate of change of sample temperature based on the temperature-time curve, and dividing the length of the temperature interval in the mutation stage into a temperature interval shorter than the length of the temperature interval in the platform stage, the accuracy of adjusting the voltage related to the color coordinates can be improved, thereby improving the offset accuracy of the color coordinates.

[0251] The second implementation method is to divide the temperature section into multiple temperature intervals of equal length.

[0252] For example, the temperature section when the operating temperature is stable is divided into multiple temperature sections with a section length of 2°C.

[0253] By dividing the temperature section when the operating temperature is stable into multiple temperature intervals of equal length, it is convenient to divide the temperature intervals.

[0254] Based on the same inventive concept, an embodiment of the present disclosure provides a display device, which includes the display module as described above.

[0255] The display device may be a liquid crystal display, a liquid crystal display screen, a liquid crystal television or other display device, or may be a mobile device such as a mobile phone, a tablet computer, or a notebook.

[0256] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0257] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A display module, wherein, Comprising: A main screen and a secondary screen arranged in a stacked manner; A temperature sensor, disposed on the secondary screen, for measuring the operating temperature of the secondary screen corresponding to different times within a preset time period after the display module is powered on; wherein, the preset time period is the time period corresponding to the display module from being powered on to the operating temperature being stable; A controller, configured to determine the screen temperature of the display module corresponding to different times within the preset time period according to each of the operating temperatures and the temperature difference value between the surface of the secondary screen and the main screen, and adjust the voltage related to the color coordinates of the pixels according to each of the screen temperatures, so that the deviation of the color coordinate value of the displayed image of the display module within the preset time period from the preset color coordinate value is less than or equal to 10‰.

2. The display module according to claim 1, wherein, The controller is further configured to: Determine the temperature range where each of the screen temperatures is located; wherein, the temperature section from the room temperature at the start of power-on of the display module to the stable operating temperature is divided into a plurality of consecutive temperature ranges; Select a voltage adjustment value corresponding to the temperature range where each of the screen temperatures is located to adjust the voltage related to the color coordinates, so that the deviation of the color coordinate value of the displayed image of the display module within the preset time period from the preset color coordinate value is less than or equal to 10‰.

3. The display module according to claim 2, wherein, The plurality of consecutive temperature ranges are composed of a plurality of temperature ranges of equal length; Or, a part of the temperature ranges among the plurality of connected temperature ranges has a first length, and another part of the temperature ranges has a second length; wherein, the first length is less than the second length.

4. The display module according to any one of claims 1 to 3, wherein, The main screen includes a main array substrate and a main color filter substrate arranged oppositely, and a main liquid crystal layer located between the main array substrate and the main color filter substrate, and the secondary screen includes a secondary array substrate and a secondary color filter substrate arranged oppositely, and a secondary liquid crystal layer located between the secondary array substrate and the secondary color filter substrate; The main liquid crystal layer uses wide-temperature liquid crystal; The secondary liquid crystal layer uses negative liquid crystal.

5. The display module according to claim 4, wherein, The clearing point of the wide-temperature liquid crystal is greater than or equal to 95 °C, the birefringence is greater than or equal to 0.098, and the amplitude of the change of the birefringence with temperature within the range of 25 °C to 45 °C is less than 7%.

6. The display module according to claim 4, wherein, The display module further includes: A high-temperature resistant backlight module; wherein, during the process of the operating temperature of the high-temperature resistant backlight module rising from room temperature to 45 °C, the change amplitude of the color coordinate deviation of the backlight module is less than a preset amplitude.

7. The display module according to claim 6, wherein, The backlight module includes: A backlight module based on fluorescence, or a backlight module based on quantum dots.

8. The display module according to claim 4, wherein, The secondary array substrate includes: A plurality of secondary data lines and a plurality of secondary gate lines; the plurality of secondary data lines and the plurality of secondary gate lines intersect to define a plurality of pixel regions, and the pixel regions correspond to the pixel regions in the main screen one by one, and the pixel regions of the main screen include a plurality of sub-pixel regions; A plurality of secondary pixel electrodes, corresponding to the plurality of pixel regions one by one; A plurality of secondary pixel switches, the gate of the secondary pixel switch is electrically connected to the secondary gate line, the first pole of the secondary pixel switch is connected to the secondary data line, and the second pole of the secondary pixel switch is connected to the secondary pixel electrode.

9. The display module according to claim 8, wherein, The secondary array substrate further includes: The secondary common electrode and the secondary common electrode line disposed on the same layer are located on the side of the secondary pixel electrode away from the main screen, and the secondary common electrode line is connected to the edge of the secondary common electrode.

10. The display module according to claim 8, wherein the secondary color filter substrate comprises a secondary black matrix; The secondary black matrix comprises island structures corresponding one by one to the plurality of secondary pixel switches, and the island structures completely cover the corresponding secondary pixel switches.

11. The display module according to claim 4, wherein, The main color filter substrate comprises: A plurality of color filters, which are high-transparency color filters with a light transmittance greater than a preset light transmittance.

12. The display module according to claim 11, wherein, The main color filter substrate further comprises: A high-transparency polarizer, located on the side of the plurality of color filters away from the main array substrate; wherein the monomer transmittance of the high-transparency polarizer is greater than or equal to 42.7%.

13. The display module according to claim 4, wherein, The main array substrate comprises: A plurality of main gate line groups and a plurality of main data lines; A plurality of main pixel electrode pairs, located in a plurality of regions defined by the intersection of the plurality of main gate line groups and the plurality of main data lines. The main gate line group comprises two main gate lines, the two main gate lines are located on both sides of the corresponding row of main pixel electrode pairs, the main pixel electrode pair comprises two main pixel electrodes arranged along the extension direction of the main gate line, and the two main gate lines are electrically connected to different main pixel electrodes in the corresponding row of main pixel electrode pairs; A plurality of main pixel switches, the gates of the main pixel switches are connected to the corresponding main gate lines, the first poles of the main pixel switches are connected to the corresponding main data lines, and the second poles of the main pixel switches are connected to the corresponding main pixel electrodes; A part of the main data line between two adjacent main pixel switches connected to the same main data line is reused as an isolation column carrier, and the extension direction of the long side of the isolation column carrier is the same as the extension direction of the main data line.

14. The display module according to claim 13, wherein, The main array substrate further comprises: A plurality of isolation columns, which correspond to the isolation column carriers one by one; The extension direction of the long side of the isolation column is the same as the extension direction of the main data line.

15. A control method for a display module, applied to the display module according to any one of claims 1-14, wherein, Comprising: After the display module is powered on, the working temperature of the secondary screen in the display module is measured in real time; Based on the working temperature and the temperature difference value between the main screen and the secondary screen, the screen temperature of the display module is determined in real time; The voltage adjustment value corresponding to the temperature range where the screen temperature is located is obtained in real time from the temperature compensation table stored locally, and the voltage related to the color coordinates of the pixels in the display module is adjusted with the voltage adjustment value, so that the deviation of the color coordinate value of the displayed picture in the preset time period after the display module is powered on from the preset color coordinate value is less than or equal to 10‰; wherein, the temperature compensation table stores the voltage adjustment values corresponding to each temperature range from the room temperature to the stable working temperature of the display module, and the preset time period is the time period corresponding to the display module from being powered on to the stable working temperature.

16. The control method according to claim 15, wherein, Before measuring the working temperature of the display module, it further comprises: The screen of the main screen rises from the room temperature at startup to the sample temperature at which the working temperature is stable; The temperature range from the room temperature to the stable working temperature is divided into a plurality of continuous temperature ranges; Adjust the voltage related to the color coordinates for each temperature range until the deviation of the color coordinate value of the display module in the corresponding temperature range from the preset color coordinate value is less than or equal to 10‰. Record the voltage adjustment values related to the color coordinates corresponding to each temperature range to obtain the temperature compensation table.

17. The control method according to claim 16, wherein dividing the temperature section from the room temperature to the stable working temperature into a plurality of consecutive temperature ranges includes: Construct a corresponding temperature-time curve according to the sample temperature of the main screen rising from the room temperature at startup to the stable working temperature. Divide the temperature section from startup to the stable working temperature into a mutation stage and a platform stage according to the temperature-time curve; wherein, in the mutation stage, the change rate of the sample temperature is greater than a first preset change rate, and in the platform stage, the change rate of the sample temperature is less than a second preset change rate. Divide the mutation stage into a plurality of temperature ranges with a first length, and divide the platform stage into a plurality of second temperature ranges with a second length; wherein, the first length is less than the second length.

18. The control method according to claim 16, wherein dividing the temperature section from the room temperature to the stable working temperature into a plurality of consecutive temperature ranges includes: Divide the temperature section into a plurality of temperature ranges with equal lengths.

19. The control method according to any one of claims 16-18, wherein, It further includes: Obtain the sample temperature of the secondary screen from the room temperature at startup to the stable temperature. Based on the sample temperature of the main screen and the sample temperature of the secondary screen, determine the temperature difference value between the main screen and the secondary screen. Construct a corresponding relationship table between the temperature range of the secondary screen and the temperature difference value according to the sample temperature of the secondary screen and the corresponding temperature difference value.

20. A display device, comprising the display module according to any one of claims 1-14.

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