Display device and adjusting method therefor

Abstract

A display device, comprising a main display module, an auxiliary display module, and an adjusting unit. The main display module comprises a main control circuit, and the main control circuit is configured to control display of the main display module; the auxiliary display module comprises an auxiliary control circuit, and the auxiliary control circuit is configured to control display of the auxiliary display module; and any two of the main control circuit, the auxiliary control circuit, and the adjusting unit are electrically connected, and the main control circuit, the auxiliary control circuit, and the adjusting unit are configured to adjust the display brightness and the display color temperature of the main display module and the auxiliary display module to be consistent.

Description

Display device and adjustment method thereof Technical Field

[0001] The embodiments of the present disclosure belong to the field of display technology, and particularly relate to a display device and an adjustment method thereof. Background Art

[0002] A triple-screen smart whiteboard (one main screen + two secondary screens) is a perfect replacement for a traditional blackboard. It supports the display and real-time interaction of documents in various formats, including text, images, audio, and video. This provides a new teaching method, facilitates effective interaction between teachers and students, livens up the classroom atmosphere, and improves teaching quality. A 63-inch secondary screen, an 86-inch main screen, and a 63-inch secondary screen form a smart blackboard, suitable for a variety of multimedia teaching scenarios. It also addresses visual differences between students on opposite sides of the classroom and has promising market prospects.

[0003] Summary of the Invention

[0004] In a first aspect, an embodiment of the present disclosure provides a display device, comprising a main display module, a sub-display module, and an adjustment unit.

[0005] The main display module includes a main control circuit, and the main control circuit is configured to control the display of the main display module;

[0006] The auxiliary display module includes an auxiliary control circuit, and the auxiliary control circuit is configured to control the display of the auxiliary display module;

[0007] Any two of the main control circuit, the auxiliary control circuit and the adjustment unit are electrically connected,

[0008] The main control circuit, the auxiliary control circuit and the adjustment unit are configured to adjust the display brightness and display color temperature of the main display module and the auxiliary display module to be consistent.

[0009] In some embodiments, the secondary display module includes a first module and a second module.

[0010] The auxiliary control circuit includes a first control circuit and a second control circuit, wherein the first control circuit is configured to control the display of the first module; the second control circuit is configured to control the display of the second module;

[0011] The adjustment unit includes a module brightness test element;

[0012] The main control circuit is configured to adjust the brightness parameter of the main display module to change values ​​one by one within a first set range, and at the same time control the module brightness test element to test and record actual display brightness data of the main display module under different brightness parameters;

[0013] The first control circuit is configured to adjust the brightness parameter of the first module to change values ​​one by one within the first set range, and at the same time control the module brightness test element to test and record actual display brightness data of the first module under different brightness parameters;

[0014] The second control circuit is configured to adjust the brightness parameter of the second module to change value by value within the first setting range, and at the same time control the module brightness test element to test and record the actual display brightness data of the second module under different brightness parameters.

[0015] In some embodiments, the main display module includes a main backlight source;

[0016] The first module includes a first backlight source;

[0017] The second module includes a second backlight source;

[0018] The adjustment unit further includes a first backlight brightness test element, a second backlight brightness test element and a third backlight brightness test element;

[0019] The main control circuit is further configured to adjust the brightness parameter of the main display module to change values ​​one by one within the first setting range, and at the same time control the first backlight brightness test element to test and record the brightness parameter of the main backlight source under different brightness parameters;

[0020] The first control circuit is further configured to adjust the brightness parameter of the first module to change value by value within the first set range, and at the same time control the second backlight brightness test element to test and record the brightness parameter of the first backlight source under different brightness parameters;

[0021] The second control circuit is further configured to adjust the brightness parameter of the second module to change value by value within the first setting range, and at the same time control the third backlight brightness test element to test and record the brightness parameter of the second backlight source under different brightness parameters.

[0022] In some embodiments, a first opening is formed in the main backlight source; the first backlight brightness test element is located in the first opening;

[0023] A second opening is formed in the first backlight source; the second backlight brightness test element is located in the second opening;

[0024] A third opening is defined in the second backlight source; and the third backlight brightness testing element is located in the third opening.

[0025] In some embodiments, the main display module further includes a first storage unit,

[0026] The first module further includes a second storage unit,

[0027] The second module further includes a third storage unit,

[0028] The main control circuit is further configured to form a first lookup table by mapping the actual display brightness data of the main display module and the brightness parameter of the main backlight source one by one, and store the first lookup table in the first storage unit;

[0029] The first control circuit is further configured to form a second lookup table by mapping the actual display brightness data of the first module and the brightness parameter of the first backlight source in a one-to-one correspondence, and store the second lookup table in the second storage unit;

[0030] The second control circuit is further configured to form a third lookup table by one-to-one correspondence between the actual display brightness data of the second module and the brightness parameter of the second backlight source, and store the third lookup table in the third storage unit.

[0031] In some embodiments, the main control circuit is further configured to adjust the brightness parameter of the main display module to a middle value within the first set range, and simultaneously control the first backlight brightness test element to test the current brightness parameter of the main backlight source under the brightness parameter;

[0032] The first control circuit is further configured to adjust the brightness parameter of the first module to the middle value within the first setting range, and simultaneously control the second backlight brightness test element to test the current brightness parameter of the first backlight source under the brightness parameter;

[0033] The second control circuit is further configured to adjust the brightness parameter of the second module to the middle value within the first setting range, and at the same time control the third backlight brightness test element to test the current brightness parameter of the second backlight source under the brightness parameter.

[0034] In some embodiments, the main control circuit is electrically connected to the first control circuit and the second control circuit respectively;

[0035] The main control circuit is further configured to, when the current brightness parameter of the main backlight source is greater than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, call the first lookup table, search the first lookup table for a brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then adjust the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table;

[0036] The first control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, call the second lookup table, search the second lookup table for a brightness parameter of the first backlight source that is equal to the current brightness parameter of the main backlight source, and then adjust the brightness parameter of the first module to the brightness parameter corresponding to the actual display brightness data of the first module corresponding to the brightness parameter of the first backlight source in the second lookup table;

[0037] The second control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, call the third lookup table, search the third lookup table for a brightness parameter of the second backlight source that is equal to the current brightness parameter of the main backlight source, and then adjust the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table;

[0038] The main control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, call the first lookup table, search the first lookup table for a brightness parameter of the main backlight source having an equivalent value to the current brightness parameter of the first backlight source, and then adjust the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table;

[0039] The second control circuit is also configured to call the third lookup table and search the third lookup table for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the first backlight source when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, and then adjust the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

[0040] In some embodiments, the main control circuit is further configured to set a color temperature parameter of the main display module and control the module brightness test element to test the color temperature data of the main display module under the color temperature parameter;

[0041] The first control circuit is further configured to adjust the color temperature parameters of the first module so that the color temperature data of the first module gradually increases by a set value within a second set range, form a fourth lookup table by mapping each color temperature parameter of the first module to the color temperature data corresponding to each color temperature parameter, and store the fourth lookup table in the second storage unit;

[0042] The second control circuit is further configured to adjust the color temperature parameters of the second module so that the color temperature data of the second module gradually increases by the set value within the second set range, form a fifth lookup table by corresponding each color temperature parameter of the second module to the color temperature data corresponding to each color temperature parameter, and store the fifth lookup table in the third storage unit.

[0043] In some embodiments, the adjustment unit further includes a first color temperature test element, a second color temperature test element, and a third color temperature test element.

[0044] The first color temperature testing element is electrically connected to the main control circuit;

[0045] The second color temperature testing element is electrically connected to the first control circuit;

[0046] The third color temperature testing element is electrically connected to the second control circuit;

[0047] The first color temperature testing element is configured to test a color temperature curve of the main display module under its color temperature parameters, and the main control circuit is further configured to transmit the color temperature curve of the main display module to the first control circuit and the second control circuit;

[0048] The second color temperature testing element is configured to test the color temperature curve of the first module at each color temperature parameter thereof; the first control circuit is further configured to compare each color temperature curve of the first module with the color temperature curve of the main display module, and set the color temperature parameter corresponding to the color temperature curve of the first module whose comparison result is within a third set range as the color temperature parameter of the first module;

[0049] The third color temperature testing element is configured to test the color temperature curve of the second module under its various color temperature parameters; the second control circuit is further configured to compare each color temperature curve of the second module with the color temperature curve of the main display module, and set the color temperature parameter corresponding to the color temperature curve of the second module whose comparison result is within the third set range as the color temperature parameter of the second module.

[0050] In some embodiments, the color temperature curve is a curve showing the change of color temperature data with grayscale.

[0051] The grayscale range is 0 to 255;

[0052] The comparison result of each color temperature curve of the first module and the color temperature curve of the main display module is the comparison result of the curves of color temperature data changing with grayscale of 30 to 255;

[0053] The comparison results of the color temperature curves of the second module and the color temperature curve of the main display module are comparison results of curves in which the color temperature data changes with gray levels of 30 to 255.

[0054] In some embodiments, the first color temperature testing element corresponds to the position of the main display module;

[0055] The second color temperature test element corresponds to the position of the first module;

[0056] The third color temperature testing element corresponds to the position of the second module.

[0057] In some embodiments, any two of the main control circuit, the first control circuit, and the second control circuit are electrically connected via an I2C bus or a USB communication line.

[0058] In some embodiments, the invention further comprises a voltage input circuit and a plurality of voltage conversion circuits, wherein the voltage input circuit and the plurality of voltage conversion circuits are electrically connected to each other;

[0059] The voltage conversion circuit is configured to convert the voltage input by the voltage input circuit into a target voltage;

[0060] The display device further includes a detection circuit, the detection circuit including a main controller and a plurality of detection devices, the main controller and the plurality of detection devices are electrically connected respectively;

[0061] The plurality of voltage conversion circuits and the plurality of detection devices correspond to each other one by one and are respectively connected in series;

[0062] The detection device is configured to detect whether the voltage conversion circuit connected in series with it is powered on, and send the detection result to the main controller;

[0063] The main controller is configured to determine whether the multiple voltage conversion circuits are powered on in a set order based on the detection results sent by the multiple detection devices, and when the determination result is no, control the detection devices to cut off the circuits to which they are connected.

[0064] In some embodiments, the detection device is configured to detect whether the voltage output by the voltage conversion circuit connected in series is greater than 1 / 2 of the target voltage, and when the detection result is yes, determine that the voltage conversion circuit connected in series is powered on.

[0065] In some embodiments, the detection device comprises a flip-flop or a level detector.

[0066] In some embodiments, the main display module is configured with a display parameter menu;

[0067] The first module is configured with the display parameter menu;

[0068] The main control circuit is further configured to adjust the display parameters of the main display module by adjusting the display parameter menu of the main display module;

[0069] The first control circuit is further configured to adjust the display parameters of the first module and the second module by adjusting the display parameter menu of the first module;

[0070] The display parameters include display brightness, display color temperature, display volume and display language.

[0071] In some embodiments, the main display module is configured with a display parameter menu;

[0072] The main control circuit is further configured to adjust the display parameters of the main display module, the first module and the second module by adjusting the display parameter menu of the main display module;

[0073] The display parameters include display brightness, display color temperature, display volume and display language.

[0074] In a second aspect, an embodiment of the present disclosure further provides an adjustment method for a display device, wherein the display device includes a main display module, a sub-display module, and an adjustment unit.

[0075] The main display module includes a main control circuit; the auxiliary display module includes an auxiliary control circuit; any two of the main control circuit, the auxiliary control circuit and the adjustment unit are electrically connected;

[0076] The adjustment method includes the main control circuit, the auxiliary control circuit and the adjustment unit adjusting the display brightness and display color temperature of the main display module and the auxiliary display module to be consistent.

[0077] In some embodiments, the secondary display module includes a first module and a second module.

[0078] The auxiliary control circuit includes a first control circuit and a second control circuit; the main control circuit is electrically connected to the first control circuit and the second control circuit respectively;

[0079] The adjustment unit includes a module brightness test element;

[0080] The main display module includes a main backlight source;

[0081] The first module includes a first backlight source;

[0082] The second module includes a second backlight source;

[0083] The adjustment unit further includes a first backlight brightness test element, a second backlight brightness test element and a third backlight brightness test element;

[0084] The main display module also includes a first storage unit,

[0085] The first module further includes a second storage unit,

[0086] The second module further includes a third storage unit,

[0087] The main control circuit, the auxiliary control circuit, and the adjustment unit adjust the display brightness of the main display module and the auxiliary display module to be consistent, including:

[0088] The main control circuit adjusts the brightness parameter of the main display module to change values ​​one by one within a first set range, and at the same time controls the module brightness test component to test and record actual display brightness data of the main display module under different brightness parameters;

[0089] The first control circuit adjusts the brightness parameter of the first module to change values ​​one by one within the first setting range, and controls the module brightness test element to test and record actual display brightness data of the first module under different brightness parameters;

[0090] The second control circuit adjusts the brightness parameter of the second module to change values ​​one by one within the first setting range, and controls the module brightness test element to test and record actual display brightness data of the second module under different brightness parameters;

[0091] The main control circuit adjusts the brightness parameter of the main display module to change values ​​one by one within the first setting range, and at the same time controls the first backlight brightness test element to test and record the brightness parameter of the main backlight source under different brightness parameters;

[0092] The first control circuit adjusts the brightness parameter of the first module to change values ​​one by one within the first setting range, and controls the second backlight brightness test element to test and record the brightness parameter of the first backlight source under different brightness parameters;

[0093] The second control circuit adjusts the brightness parameter of the second module to change values ​​one by one within the first setting range, and at the same time controls the third backlight brightness test element to test and record the brightness parameter of the second backlight source under different brightness parameters;

[0094] The main control circuit forms a first lookup table by corresponding the actual display brightness data of the main display module to the brightness parameter of the main backlight source, and stores the first lookup table in the first storage unit;

[0095] The first control circuit forms a second lookup table by corresponding the actual display brightness data of the first module to the brightness parameter of the first backlight source, and stores the second lookup table in the second storage unit;

[0096] The second control circuit forms a third lookup table by corresponding the actual display brightness data of the second module to the brightness parameter of the second backlight source in a one-to-one manner, and stores the third lookup table in the third storage unit;

[0097] The main control circuit adjusts the brightness parameter of the main display module to a middle value within the first setting range, and controls the first backlight brightness test element to test the current brightness parameter of the main backlight source under the brightness parameter;

[0098] The first control circuit adjusts the brightness parameter of the first module to the middle value within the first setting range, and controls the second backlight brightness test element to test the current brightness parameter of the first backlight source under the brightness parameter;

[0099] The second control circuit adjusts the brightness parameter of the second module to the middle value within the first setting range, and controls the third backlight brightness test element to test the current brightness parameter of the second backlight source under the brightness parameter;

[0100] When the current brightness parameter of the main backlight source is greater than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table, searches the first lookup table for a brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then adjusts the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table;

[0101] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the first control circuit calls the second lookup table, searches the second lookup table for the brightness parameter of the first backlight source that is equal to the current brightness parameter of the main backlight source, and then adjusts the brightness parameter of the first module to the brightness parameter corresponding to the actual display brightness data of the first module corresponding to the brightness parameter of the first backlight source in the second lookup table;

[0102] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table, searches the third lookup table for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the main backlight source, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table;

[0103] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table, searches the first lookup table for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then adjusts the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table;

[0104] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table and searches for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the first backlight source in the third lookup table, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

[0105] In some embodiments, the adjustment unit further includes a first color temperature test element, a second color temperature test element, and a third color temperature test element.

[0106] The first color temperature testing element is electrically connected to the main control circuit;

[0107] The second color temperature testing element is electrically connected to the first control circuit;

[0108] The third color temperature testing element is electrically connected to the second control circuit;

[0109] The main control circuit, the auxiliary control circuit, and the adjustment unit adjust the display color temperatures of the main display module and the auxiliary display module to be consistent, including:

[0110] The main control circuit sets the color temperature parameter of the main display module and controls the module brightness test element to test the color temperature data of the main display module under the color temperature parameter;

[0111] The first control circuit adjusts the color temperature parameters of the first module so that the color temperature data of the first module gradually increases by a set value within a second set range, forms a fourth lookup table by mapping each color temperature parameter of the first module to the color temperature data corresponding to each color temperature parameter, and stores the fourth lookup table in the second storage unit;

[0112] The second control circuit adjusts the color temperature parameter of the second module so that the color temperature data of the second module gradually increases by the set value within the second set range, forms a fifth lookup table by mapping each color temperature parameter of the second module to the color temperature data corresponding to each color temperature parameter, and stores the fifth lookup table in the third storage unit;

[0113] The first color temperature testing element tests the color temperature curve of the main display module under its color temperature parameters, and the main control circuit transmits the color temperature curve of the main display module to the first control circuit and the second control circuit;

[0114] The second color temperature testing element tests the color temperature curve of the first module under various color temperature parameters. The first control circuit compares the color temperature curves of the first module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the first module whose comparison result is within a third set range as the color temperature parameter of the first module.

[0115] The third color temperature testing element tests the color temperature curve of the second module under its various color temperature parameters; the second control circuit compares each color temperature curve of the second module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the second module whose comparison result is within the third set range as the color temperature parameter of the second module. BRIEF DESCRIPTION OF THE DRAWINGS

[0116] The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing the detailed exemplary embodiments with reference to the accompanying drawings, in which:

[0117] FIG1 is a schematic diagram showing the splicing of the main screen and the secondary screen of a current display device.

[0118] FIG. 2 is a schematic diagram showing the operating timing of an input voltage circuit and various voltage conversion circuits in a conventional display device.

[0119] FIG. 3 a is a schematic diagram showing the settings of the main screen and sub-screen control menus in the current display device.

[0120] FIG3 b is a schematic diagram showing the adjustment of the main screen and sub-screen control menus in the current display device.

[0121] FIG4 is a principle block diagram of a display device in an embodiment of the present disclosure.

[0122] FIG5 a is a schematic diagram showing the connections among the voltage input circuit, the voltage conversion circuit, and the detection circuit in the display device according to an embodiment of the present disclosure.

[0123] FIG5 b is a schematic diagram showing the operating timing of the voltage input circuit and each voltage conversion circuit in the display device according to an embodiment of the present disclosure.

[0124] FIG6 a is a schematic diagram showing a setting of display parameter menus of the main display module, the first module, and the second module in the display device according to an embodiment of the present disclosure.

[0125] FIG6 b is a schematic diagram illustrating an adjustment of the display parameter menus of the main display module, the first module, and the second module in the display device according to an embodiment of the present disclosure.

[0126] FIG. 7 a is another schematic diagram of setting display parameter menus of the main display module, the first module, and the second module in the display device according to an embodiment of the present disclosure.

[0127] FIG. 7 b is another schematic diagram of adjusting the display parameter menus of the main display module, the first module, and the second module in the display device according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0128] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, a display device and an adjustment method thereof provided by the embodiments of the present disclosure are further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0129] The embodiments of the present disclosure will be described more fully below with reference to the accompanying drawings, but the illustrated embodiments may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully enable those skilled in the art to understand the scope of this disclosure.

[0130] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions shown in the drawings illustrate specific shapes of the regions, but are not intended to be limiting.

[0131] The innovative application of smart whiteboards has brought new vitality to education and teaching, enhancing teacher-student interaction and improving learning efficiency. However, spliced ​​whiteboard display devices can present other display issues, such as inconsistent brightness between the main and secondary screens within the display device, inconsistent display effects due to inconsistent color temperatures between the main and secondary screens within the display device, abnormal power-on timing within the display device, which can damage circuit boards and components on them, and complex operations for synchronously changing display parameters between the main and secondary screens within the display device.

[0132] At present, for display devices formed by splicing a main screen and a secondary screen, the consistency of the maximum brightness of the main screen and the secondary screen is a key indicator. Refer to Figure 1, which is a schematic diagram of the splicing of the main screen and the secondary screen of the current display device; taking the current triple-screen smart whiteboard project with one main screen + two secondary screens as an example, due to the different materials used in the components of the main screen and the secondary screen (such as backlight materials, light strip materials, etc.), there is a certain difference in the factory brightness of the main screen and the secondary screen. The maximum brightness of the 86-inch main screen can reach 490nit, and the maximum brightness of the 63-inch secondary screen is only 380nit. The brightness difference between the main screen and the secondary screen is visible to the naked eye under the white screen. When actually used for teaching, the viewing effect of students sitting on the left and right sides of the classroom is obviously not as good as that of students in the middle area.

[0133] At present, splicing displays are pursuing the ultimate display consistency. The triple-screen smart whiteboard is also a splicing display method, so the problem of its display consistency also needs to be dealt with. The consistency of the color temperature of the main screen and the secondary screen is one of the indicators that need to be paid attention to. Ensuring the consistency of the color temperature of the main screen and the secondary screen is the basis for the consistent display of the triple-screen smart whiteboard.

[0134] In addition, referring to Figure 2, it is a schematic diagram of the working timing of the input voltage circuit and each voltage conversion circuit in the current display device; the main control system circuit of the display device generally has one or two input voltages (usually 5V or 12V), and multiple voltage conversion circuits (such as DC-DC, DC voltage conversion circuit) inside the display device convert the input voltage into the voltage required by other control systems in the display device (such as 3.3V, 1.5V, 0.95V, etc.). The conversion voltages output by these voltage conversion circuits have certain timing requirements. For example, after the 12V or 5V input voltage is input, 3.3V and 1.5V need to be powered on in sequence first, and then 0.95V is powered on after a period of time. When the conversion voltage output by the voltage conversion circuit does not meet the timing requirements, the operation of the main control system will be at risk and electronic components may be burned out. Therefore, the display device requires a solution for controlling the power-on timing (i.e., power-on sequence) of multiple voltage conversion circuits.

[0135] In addition, referring to Figure 3a, there is a schematic diagram of the settings of the main screen and sub-screen control menus in the current display device; Figure 3b is a schematic diagram of the adjustment of the main screen and sub-screen control menus in the current display device; the triple-screen smart whiteboard is essentially three independent display screens, and the three display screens control their control menus through their respective control systems (SOC) to adjust the relevant content of their display parameters (such as display brightness, display color temperature, display sound, display language, etc.). Currently, when using the three display screens, their control menus need to be set separately through their control systems, which is inconvenient to use.

[0136] In order to solve the problem of inconsistent display effects caused by inconsistent display brightness and display color temperature between the main screen and the sub-screen in the triple-screen smart whiteboard, on the first hand, the present embodiment provides a display device, referring to Figure 4, which is a principle block diagram of the display device in the present embodiment; wherein, the display device includes a main display module 1, a sub-display module 2 and an adjustment unit 3, the main display module 1 includes a main control circuit 11, and the main control circuit 11 is configured to control the display of the main display module 1; the sub-display module 2 includes a sub-control circuit 20, and the sub-control circuit 20 is configured to control the display of the sub-display module 2; any two of the main control circuit 11, the sub-control circuit 20 and the adjustment unit 3 are electrically connected, and the main control circuit 11, the sub-control circuit 20 and the adjustment unit 3 are configured to adjust the display brightness and display color temperature of the main display module 1 and the sub-display module 2 to be consistent.

[0137] The main display module 1 and the auxiliary display module 2 can be spliced ​​together to form the display device. This display device adjusts the display brightness and display color temperature of the main display module 1 and the auxiliary display module 2 to be consistent through the main control circuit 11, the auxiliary control circuit 20, and the adjustment unit 3. This solves the problem of inconsistent display effects caused by inconsistent display brightness and display color temperature between the main display module 1 and the auxiliary display module 2, improves the consistency of the display effect of the entire display device, and thus improves the display effect of the display device. This display device can be used in the field of education and teaching to enhance teacher-student interaction and improve learning efficiency.

[0138] In some embodiments, referring to Figure 4, the auxiliary display module 2 includes a first module 21 and a second module 22, the auxiliary control circuit 20 includes a first control circuit 201 and a second control circuit 202, the first control circuit 201 is configured to control the display of the first module 21; the second control circuit 202 is configured to control the display of the second module 22; the adjustment unit 3 includes a module brightness test element 31.

[0139] The main control circuit 11 is configured to adjust the brightness parameters of the main display module 1 to change value by value within a first set range, and at the same time control the module brightness test element 31 to test and record the actual display brightness data xi of the main display module 1 under different brightness parameters, where i = 1, 2, 3,…, n; xi represents the actual display brightness data of the main display module 1 under the brightness parameters of the i-th main display module 1.

[0140] The first control circuit 201 is configured to adjust the brightness parameter of the first module 21 to change value by value within a first set range, and at the same time control the module brightness test element 31 to test and record the actual display brightness data yi of the first module 21 under different brightness parameters, where i = 1, 2, 3, ..., n; yi represents the actual display brightness data of the first module 21 under the brightness parameter of the i-th first module 21.

[0141] The second control circuit 202 is configured to adjust the brightness parameter of the second module 22 to change value by value within a first set range, and at the same time control the module brightness test element 31 to test and record the actual display brightness data zi of the second module 22 under different brightness parameters, where i = 1, 2, 3, ..., n; zi represents the actual display brightness data of the second module 22 under the brightness parameter of the i-th second module 22.

[0142] The brightness parameters of the main display module 1, first module 21, and second module 22 are unitless, with a first setting range of 0-100. The actual display brightness data for the main display module 1, first module 21, and second module 22 is measured in nits. The brightness parameters of the main display module 1, first module 21, and second module 22 are adjusted sequentially within the first setting range, for example, to 0, 1, 2, 3, ..., 100. The actual display brightness data at each different brightness parameter is tested and recorded.

[0143] In some embodiments, the module brightness test component 31 is a color analyzer, which can be external.

[0144] In some embodiments, the main display module 1 includes a main backlight source; the first module 21 includes a first backlight source; the second module 22 includes a second backlight source; the adjustment unit 3 also includes a first backlight brightness test element 32, a second backlight brightness test element 33 and a third backlight brightness test element 34.

[0145] The main control circuit 11 is also configured to adjust the brightness parameters of the main display module 1 to change value by value within a first set range, and at the same time control the first backlight brightness test element 32 to test and record the brightness parameters ai of the main backlight source under different brightness parameters, where i = 1, 2, 3,…, n; ai represents the brightness parameters of the main backlight source under the brightness parameters of the i-th main display module 1.

[0146] The first control circuit 201 is also configured to adjust the brightness parameter of the first module 21 to change value by value within a first set range, and at the same time control the second backlight brightness test element 33 to test and record the brightness parameter bi of the first backlight source under different brightness parameters, where i = 1, 2, 3,…, n; bi represents the brightness parameter of the first backlight source under the brightness parameter of the i-th first module 21.

[0147] The second control circuit 202 is also configured to adjust the brightness parameter of the second module 22 to change value by value within a first set range, and at the same time control the third backlight brightness test element 34 to test and record the brightness parameter ci of the second backlight source under different brightness parameters, where i = 1, 2, 3, ..., n; ci represents the brightness parameter of the second backlight source under the brightness parameter of the i-th second module 22.

[0148] The brightness parameters of the main backlight, the first backlight, and the second backlight do not have units. The brightness parameters of the main display module 1, the first module 21, and the second module 22 are adjusted one by one within a first set range, such as adjusting the brightness parameters to 0, 1, 2, 3, ..., 100, and testing and recording the brightness parameters of each backlight at each different brightness parameter.

[0149] In some embodiments, a first opening is opened in the main backlight source; the first backlight brightness test element 32 is located in the first opening; a second opening is opened in the first backlight source; the second backlight brightness test element 33 is located in the second opening; a third opening is opened in the second backlight source; and the third backlight brightness test element 34 is located in the third opening.

[0150] In some embodiments, the first backlight brightness test element 32 , the second backlight brightness test element 33 , and the third backlight brightness test element 34 are all brightness sensors.

[0151] In some embodiments, the main display module 1 further includes a first storage unit, the first module 21 further includes a second storage unit, and the second module 22 further includes a third storage unit.

[0152] The main control circuit 11 is further configured to form a first lookup table LUT1 by one-to-one correspondence between the actual display brightness data xi of the main display module 1 and the brightness parameter ai of the main backlight source, and store the first lookup table LUT1 in the first storage unit.

[0153] LUT1

[0154] The first control circuit 201 is further configured to form a second lookup table LUT2 by mapping the actual display brightness data yi of the first module 21 and the brightness parameter bi of the first backlight source in a one-to-one correspondence, and store the second lookup table LUT2 in the second storage unit.

[0155] LUT2

[0156] The second control circuit 202 is further configured to form a third lookup table LUT3 by mapping the actual display brightness data zi of the second module 22 and the brightness parameter ci of the second backlight source in a one-to-one correspondence, and store the third lookup table LUT3 in the third storage unit.

[0157] LUT3

[0158] In some embodiments, the main control circuit 11 is further configured to adjust the brightness parameter of the main display module 1 to a middle value within the first set range, and simultaneously control the first backlight brightness test element 32 to test the current brightness parameter a' of the main backlight source under the brightness parameter.

[0159] The first control circuit 201 is further configured to adjust the brightness parameter of the first module 21 to a middle value within the first set range, and simultaneously control the second backlight brightness test element 33 to test the current brightness parameter b' of the first backlight source under the brightness parameter.

[0160] The second control circuit 202 is further configured to adjust the brightness parameter of the second module 22 to a middle value within the first setting range, and control the third backlight brightness test element 34 to test the current brightness parameter c' of the second backlight source under the brightness parameter.

[0161] In some embodiments, the main control circuit 11, the first control circuit 201, and the second control circuit 202 respectively adjust the brightness parameters of the main display module 1, the first module 21, and the second module 22 to any value within the middle segment of 40-60 within the first setting range of 0-100, such as 50, and test the current brightness parameter of each backlight source at the brightness parameter of 50. Adjusting the brightness parameters of the main display module 1, the first module 21, and the second module 22 to the middle segment value within the first setting range facilitates subsequent adjustment of the display brightness of each module to be consistent.

[0162] In some embodiments, the main control circuit 11 is electrically connected to the first control circuit 201 and the second control circuit 202. In some embodiments, any two of the main control circuit 11, the first control circuit 201 and the second control circuit 202 are electrically connected via an I2C bus or a USB communication line.

[0163] The main control circuit 11 is further configured to, when the current brightness parameter a' of the main backlight source is greater than the current brightness parameter b' of the first backlight source and the current brightness parameter b' of the first backlight source is equal to the current brightness parameter c' of the second backlight source, access the first lookup table LUT1, search the first lookup table LUT1 for the brightness parameter a of the main backlight source that is equal to the current brightness parameter b' of the first backlight source, and then adjust the brightness parameter of the main display module 1 to the brightness parameter corresponding to the actual display brightness data x of the main display module 1 corresponding to the brightness parameter a of the main backlight source in the first lookup table LUT1. In this way, the display brightness of the main display module 1 can be adjusted to be consistent with the display brightness of the first module 21.

[0164] The first control circuit 201 is further configured to, when the current brightness parameter a' of the main backlight source is less than the current brightness parameter b' of the first backlight source and the current brightness parameter b' of the first backlight source is equal to the current brightness parameter c' of the second backlight source, access the second lookup table LUT2, search the second lookup table LUT2 for the brightness parameter b of the first backlight source that is equal to the current brightness parameter a' of the main backlight source, and then adjust the brightness parameter of the first module 21 to the brightness parameter corresponding to the actual display brightness data y of the first module 21 corresponding to the brightness parameter b of the first backlight source in the second lookup table LUT2. In this way, the display brightness of the first module 21 can be adjusted to be consistent with the display brightness of the main display module 1.

[0165] The second control circuit 202 is further configured to, when the current brightness parameter a' of the main backlight source is less than the current brightness parameter b' of the first backlight source and the current brightness parameter b' of the first backlight source is equal to the current brightness parameter c' of the second backlight source, access the third lookup table LUT3, search the third lookup table LUT3 for the brightness parameter c of the second backlight source that is equal to the current brightness parameter a' of the main backlight source, and then adjust the brightness parameter of the second module 22 to the brightness parameter corresponding to the actual display brightness data z of the second module 22 corresponding to the brightness parameter c of the second backlight source in the third lookup table LUT3. In this way, the display brightness of the second module 22 can be adjusted to be consistent with the display brightness of the main display module 1.

[0166] The main control circuit 11 is further configured to, when the current brightness parameter a' of the main backlight source is less than the current brightness parameter b' of the first backlight source and the current brightness parameter b' of the first backlight source is less than the current brightness parameter c' of the second backlight source, access the first lookup table LUT1, search the first lookup table LUT1 for the brightness parameter a of the main backlight source that is equal to the current brightness parameter b' of the first backlight source, and then adjust the brightness parameter of the main display module 1 to the brightness parameter corresponding to the actual display brightness data x of the main display module 1 corresponding to the brightness parameter a of the main backlight source in the first lookup table LUT1. In this way, the display brightness of the main display module 1 can be adjusted to be consistent with the display brightness of the first module 21.

[0167] The second control circuit 201 is further configured to, when the current brightness parameter a' of the main backlight source is less than the current brightness parameter b' of the first backlight source and the current brightness parameter b' of the first backlight source is less than the current brightness parameter c' of the second backlight source, access the third lookup table LUT3, search the third lookup table LUT3 for the brightness parameter c of the second backlight source that is equal to the current brightness parameter b' of the first backlight source, and then adjust the brightness parameter of the second module 22 to the brightness parameter z corresponding to the actual display brightness data of the second module 22 corresponding to the brightness parameter c of the second backlight source in the third lookup table LUT3. In this way, the display brightness of the second module 22 can be adjusted to be consistent with the display brightness of the first module 21.

[0168] In some embodiments, the main display module 1, the first module 21, and the second module 22 are all liquid crystal modules. The brightness of the display device is adjusted using a PWM (pulse width modulation) mode. This means that the voltage of the backlight lamps in each module is pulse-width modulated to control the current flowing through the lamps by varying the duty cycle, thereby varying the backlight and display brightness of each module.

[0169] In some embodiments, the main control circuit 11 is further configured to set a color temperature parameter of the main display module 1 and control the module brightness test element 31 to test the color temperature data of the main display module 1 under the color temperature parameter.

[0170] The color temperature parameter is the gain ratio of red, green and blue. The main display module 1 can usually preset its color temperature data to 6500K, 7500K or 9300K, and special color temperature data can be adjusted according to needs.

[0171] The first control circuit 201 is further configured to adjust the color temperature parameters of the first module 21 so that the color temperature data of the first module 21 gradually increases by a set value within a second set range, and form a fourth lookup table LUT4 by correspondingly mapping each color temperature parameter of the first module 21 to the color temperature data corresponding to each color temperature parameter, and store the fourth lookup table LUT4 in the second storage unit.

[0172] LUT4

[0173] The second control circuit 202 is further configured to adjust the color temperature parameters of the second module 22 so that the color temperature data of the second module 22 gradually increases by a set value within a second set range, and form a fifth lookup table LUT5 by correspondingly mapping each color temperature parameter of the second module 22 to the color temperature data corresponding to each color temperature parameter, and store the fifth lookup table LUT5 in the third storage unit.

[0174] LUT5

[0175] The second setting range is 6000K-10000K, and the setting value is 100K, that is, the color temperature data of the first module 21 increases by 100K in the second setting range.

[0176] In some embodiments, the adjustment unit 3 also includes a first color temperature testing element 35, a second color temperature testing element 36 and a third color temperature testing element 37, the first color temperature testing element 35 is electrically connected to the main control circuit 11; the second color temperature testing element 36 is electrically connected to the first control circuit 201; the third color temperature testing element 37 is electrically connected to the second control circuit 202.

[0177] The first color temperature test element 35 is configured to test the color temperature curve of the main display module 1 under its color temperature parameters. The main control circuit 11 is also configured to transmit the color temperature curve of the main display module 1 to the first control circuit 201 and the second control circuit 202 .

[0178] For example, the main control circuit 11 sets the color temperature parameters of the main display module 1 so that the color temperature data of the main display module 1 under the color temperature parameters is 6500K. The first color temperature test element 35 tests the color temperature curve of the main display module 1 under the color temperature parameters, that is, after the color temperature parameters of the main display module 1 are set, it has only one color temperature curve.

[0179] In some embodiments, the main control circuit 11 is communicated with the first control circuit 201 and the second control circuit 202 via serial interfaces, so that the main control circuit 11 transmits the color temperature curve of the main display module 1 to the first control circuit 201 and the second control circuit 202 respectively.

[0180] The second color temperature testing element 36 is configured to test the color temperature curve of the first module 21 under its various color temperature parameters; the first control circuit 201 is also configured to compare the various color temperature curves of the first module 21 with the color temperature curve of the main display module 1, and set the color temperature parameter corresponding to the color temperature curve of the first module 21 whose comparison result is within the third set range as the color temperature parameter of the first module 21.

[0181] The first module 21 has multiple color temperature parameters, and each color temperature data in the fourth lookup table LUT4 corresponds to a color temperature parameter; one color temperature parameter corresponds to one color temperature curve, that is, the first module 21 has multiple color temperature curves.

[0182] The third color temperature testing element 37 is configured to test the color temperature curve of the second module 22 under its various color temperature parameters; the second control circuit 202 is also configured to compare the various color temperature curves of the second module 22 with the color temperature curve of the main display module 1, and set the color temperature parameter corresponding to the color temperature curve of the second module 22 whose comparison result is within the third set range as the color temperature parameter of the second module 22.

[0183] The second module 22 has multiple color temperature parameters, and each color temperature data in the fifth lookup table LUT5 corresponds to a color temperature parameter; one color temperature parameter corresponds to one color temperature curve, that is, the second module 22 has multiple color temperature curves.

[0184] In some embodiments, the third setting range is -500K to 500K.

[0185] In some embodiments, the color temperature curve is a curve showing the color temperature data changing with grayscale, and the grayscale changing range is 0 to 255; the comparison results of each color temperature curve of the first module 21 and the color temperature curve of the main display module 1 are the comparison results of the curve showing the color temperature data changing with grayscale of 30 to 255; the comparison results of each color temperature curve of the second module and the color temperature curve of the main display module are the comparison results of the curve showing the color temperature data changing with grayscale of 30 to 255.

[0186] Among them, the color temperature curve is the color temperature data change of the main display module, the first module 21 and the second module 22 as the display grayscale changes, that is, the coordinate system where the color temperature curve is located is a coordinate system composed of grayscale values ​​and color temperature data, and the horizontal axis in the coordinate system where the color temperature curve is located is the grayscale value, and the vertical axis is the color temperature data.

[0187] In this embodiment, each color temperature curve of the first module 21 is compared with the color temperature curve of the main display module 1. The specific comparison process is to compare the color temperature data corresponding to the grayscale of 30 to 255 on the color temperature curve of the first module 21 with the color temperature data corresponding to the grayscale of 30 to 255 on the color temperature curve of the main display module 1 one by one. If the comparison results of each group of color temperature data corresponding to the grayscale of 30 to 255 are all within the third set range, the color temperature parameters of the first module 21 corresponding to the color temperature curve are set as the color temperature parameters of the first module 21, thereby achieving the consistency of the color temperature parameters of the first module 21 with the color temperature parameters of the main display module 1. Similarly, each color temperature curve of the second module 22 is compared with the color temperature curve of the main display module 1. The specific comparison process is to compare the color temperature data corresponding to the grayscale of 30 to 255 on the color temperature curve of the second module 22 with the color temperature data corresponding to the grayscale of 30 to 255 on the color temperature curve of the main display module 1 one by one. If the comparison results of each group of color temperature data corresponding to the grayscale of 30 to 255 are within the third set range, the color temperature parameters of the second module 22 corresponding to the color temperature curve are set as the color temperature parameters of the second module 22, thereby achieving the consistency of the color temperature parameters of the second module 22 with the color temperature parameters of the main display module 1.

[0188] In some embodiments, the first color temperature testing element 35 corresponds to the main display module 1 ; the second color temperature testing element 36 corresponds to the first module 21 ; and the third color temperature testing element 37 corresponds to the second module 22 .

[0189] In some embodiments, the first color temperature testing element 35 , the second color temperature testing element 36 , and the third color temperature testing element 37 are each an external camera.

[0190] In some embodiments, referring to FIG5 a , a connection diagram of a voltage input circuit, a voltage conversion circuit, and a detection circuit in a display device according to an embodiment of the present disclosure is shown; FIG5 b is a timing diagram of the operation of the voltage input circuit and each voltage conversion circuit in the display device according to an embodiment of the present disclosure; wherein the display device further includes a voltage input circuit 4 and a plurality of voltage conversion circuits 5, which are electrically connected to each other; the voltage conversion circuit 5 is configured to convert a voltage input by the voltage input circuit 4 into a target voltage; the display device further includes a detection circuit 6, which includes a main controller 61 and a plurality of detection devices 62, which are electrically connected to each other; the plurality of voltage conversion circuits 5 and the plurality of detection devices 62 correspond to each other one by one and are connected in series; the detection device 62 is configured to detect whether the voltage conversion circuit 5 connected in series is powered on and send the detection result to the main controller 61; the main controller 61 is configured to determine whether the plurality of voltage conversion circuits 5 are powered on in a set order based on the detection results sent by the plurality of detection devices 62, and if the determination result is negative, control the detection device 62 to disconnect the circuit to which it is connected.

[0191] Among them, the setting of the detection circuit 6 can protect the various working circuits in the display device from operating risks due to disordered working timing, thereby protecting the electronic devices in the various working circuits in the display device from being burned out, and ensuring the normal working timing and normal operation of the various working circuits in the display device.

[0192] In some embodiments, the detection device 62 is configured to detect whether the voltage output by the voltage conversion circuit 5 connected in series is greater than 1 / 2 of the target voltage, and when the detection result is yes, determine that the voltage conversion circuit 5 connected in series is powered on.

[0193] In some embodiments, the detection device 62 includes a flip-flop or a level detector.

[0194] In some embodiments, referring to Figure 6a, a setting diagram of the display parameter menus of the main display module, the first module and the second module in the display device of the embodiment of the present disclosure is shown; Figure 6b is an adjustment diagram of the display parameter menus of the main display module, the first module and the second module in the display device of the embodiment of the present disclosure; wherein, the main display module 1 is configured with a display parameter menu; the first module 21 is configured with a display parameter menu; the main control circuit is further configured to adjust the display parameters of the main display module 1 by adjusting the display parameter menu of the main display module 1; the first control circuit is further configured to adjust the display parameters of the first module 21 and the second module 22 by adjusting the display parameter menu of the first module 21; the display parameters include display brightness, display color temperature, display volume and display language.

[0195] In some embodiments, referring to Figures 6a and 6b, the main display module 1 independently adjusts its display parameter menu, while the first module 21 and the second module 22 simultaneously adjust their display parameter menus: the first module 21 displays its display parameter menu, while the second module 22 hides its display parameter menu. The first module 21 adjusts the display parameter menu of the second module 22 via I2C bus or USB communication line communication transmission.

[0196] In some embodiments, referring to Figure 7a, another setting diagram of the display parameter menus of the main display module, the first module and the second module in the display device of the embodiment of the present disclosure is shown; Figure 7b is another adjustment diagram of the display parameter menus of the main display module, the first module and the second module in the display device of the embodiment of the present disclosure; wherein, the main display module 1 is configured with a display parameter menu; the main control circuit is also configured to adjust the display parameters of the main display module 1, the first module 21 and the second module 22 by adjusting the display parameter menu of the main display module 1; the display parameters include display brightness, display color temperature, display volume and display language.

[0197] In some embodiments, referring to Figures 7a and 7b, the main display module 1, the first module 21, and the second module 22 synchronously adjust their display parameter menus. At this time, the main display module 1, the first module 21, and the second module 22 are required to use the same control system and the same display architecture (such as the backlight sources and display panels of the three are consistent in performance and specifications, etc.). When one of the main display module 1, the first module 21, and the second module 22 (such as the main display module 1) adjusts its display parameter menu, the display parameter menus of the first module 21 and the second module 22 are also adjusted; that is, only the main display module 1 displays its display parameter menu, and the first module 21 and the second module 22 both hide their display parameter menus.

[0198] Based on the above structure of the display device, in a second aspect, an embodiment of the present disclosure further provides an adjustment method for a display device, wherein the display device includes a main display module, a sub-display module and an adjustment unit, the main display module includes a main control circuit; the sub-display module includes a sub-control circuit; any two of the main control circuit, the sub-control circuit and the adjustment unit are electrically connected; the adjustment method includes the main control circuit, the sub-control circuit and the adjustment unit adjusting the display brightness and display color temperature of the main display module and the sub-display module to be consistent.

[0199] In some embodiments, the auxiliary display module includes a first module and a second module, the auxiliary control circuit includes a first control circuit and a second control circuit; the main control circuit is electrically connected to the first control circuit and the second control circuit respectively; the adjustment unit includes a module brightness test element; the main display module includes a main backlight source; the first module includes a first backlight source; the second module includes a second backlight source; the adjustment unit also includes a first backlight brightness test element, a second backlight brightness test element and a third backlight brightness test element; the main display module also includes a first storage unit, the first module also includes a second storage unit, and the second module also includes a third storage unit.

[0200] In the display device adjustment method, the main control circuit, the auxiliary control circuit, and the adjustment unit adjust the display brightness of the main display module and the auxiliary display module to be consistent, including:

[0201] Step S101: the main control circuit adjusts the brightness parameter of the main display module to change values ​​one by one within a first set range, and at the same time controls the module brightness test element to test and record actual display brightness data of the main display module under different brightness parameters.

[0202] The first control circuit adjusts the brightness parameter of the first module to change values ​​one by one within a first set range, and at the same time controls the module brightness test component to test and record actual display brightness data of the first module under different brightness parameters.

[0203] The second control circuit adjusts the brightness parameter of the second module to change values ​​one by one within the first set range, and at the same time controls the module brightness test component to test and record actual display brightness data of the second module under different brightness parameters.

[0204] Step S102: the main control circuit adjusts the brightness parameter of the main display module to change gradually within a first set range, and simultaneously controls the first backlight brightness test element to test and record the brightness parameter of the main backlight source under different brightness parameters.

[0205] The first control circuit adjusts the brightness parameter of the first module to change values ​​one by one within a first set range, and simultaneously controls the second backlight brightness test element to test and record the brightness parameter of the first backlight source under different brightness parameters.

[0206] The second control circuit adjusts the brightness parameter of the second module to change values ​​one by one within the first setting range, and simultaneously controls the third backlight brightness test element to test and record the brightness parameter of the second backlight source under different brightness parameters.

[0207] Step S103: the main control circuit forms a first lookup table by mapping the actual display brightness data of the main display module and the brightness parameters of the main backlight source one-to-one, and stores the first lookup table in the first storage unit.

[0208] The first control circuit forms a second lookup table by matching the actual display brightness data of the first module with the brightness parameter of the first backlight source in a one-to-one manner, and stores the second lookup table in the second storage unit.

[0209] The second control circuit forms a third lookup table by matching the actual display brightness data of the second module with the brightness parameter of the second backlight source in a one-to-one manner, and stores the third lookup table in the third storage unit.

[0210] Step S104: the main control circuit adjusts the brightness parameter of the main display module to a middle value within the first set range, and controls the first backlight brightness test element to test the current brightness parameter of the main backlight source under the brightness parameter.

[0211] The first control circuit adjusts the brightness parameter of the first module to a middle value within a first set range, and simultaneously controls the second backlight brightness test element to test the current brightness parameter of the first backlight source under the brightness parameter.

[0212] The second control circuit adjusts the brightness parameter of the second module to a middle value within the first setting range, and controls the third backlight brightness test element to test the current brightness parameter of the second backlight source under the brightness parameter.

[0213] Step S105: When the current brightness parameter of the main backlight source is greater than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table and searches for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source in the first lookup table, and then adjusts the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table.

[0214] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the first control circuit calls the second lookup table and searches for the brightness parameter of the first backlight source that is equal to the current brightness parameter of the main backlight source in the second lookup table, and then adjusts the brightness parameter of the first module to the brightness parameter corresponding to the actual display brightness data of the first module corresponding to the brightness parameter of the first backlight source in the second lookup table.

[0215] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table and searches for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the main backlight source in the third lookup table, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

[0216] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table and searches for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source in the first lookup table, and then adjusts the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table.

[0217] When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table and searches for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the first backlight source in the third lookup table, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

[0218] In some embodiments, the adjustment unit further includes a first color temperature test element, a second color temperature test element, and a third color temperature test element, wherein the first color temperature test element is electrically connected to the main control circuit; the second color temperature test element is electrically connected to the first control circuit; and the third color temperature test element is electrically connected to the second control circuit.

[0219] In the display device adjustment method, a main control circuit, a sub-control circuit, and an adjustment unit adjust the display color temperatures of the main display module and the sub-display module to be consistent, including:

[0220] Step S201: the main control circuit sets the color temperature parameters of the main display module, and controls the module brightness test component to test the color temperature data of the main display module under the color temperature parameters.

[0221] Step S202: The first control circuit adjusts the color temperature parameters of the first module so that the color temperature data of the first module gradually increases by a set value within a second set range. A fourth lookup table is formed by mapping each color temperature parameter of the first module to the color temperature data corresponding to each color temperature parameter. The fourth lookup table is stored in the second storage unit.

[0222] The second control circuit adjusts the color temperature parameters of the second module so that the color temperature data of the second module gradually increases by a set value within a second set range, forms a fifth lookup table by mapping each color temperature parameter of the second module to the color temperature data corresponding to each color temperature parameter, and stores the fifth lookup table in the third storage unit.

[0223] Step S203 : The first color temperature test element tests the color temperature curve of the main display module under its color temperature parameters, and the main control circuit transmits the color temperature curve of the main display module to the first control circuit and the second control circuit.

[0224] The second color temperature testing element tests the color temperature curve of the first module under its various color temperature parameters; the first control circuit compares each color temperature curve of the first module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the first module whose comparison result is within the third set range as the color temperature parameter of the first module.

[0225] The third color temperature testing element tests the color temperature curve of the second module under its various color temperature parameters; the second control circuit compares each color temperature curve of the second module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the second module whose comparison result is within the third set range as the color temperature parameter of the second module.

[0226] The display device provided in the disclosed embodiments adjusts the display brightness and color temperature of the main and auxiliary display modules to be consistent through a main control circuit, a secondary control circuit, and an adjustment unit. This solves the problem of inconsistent display effects caused by inconsistent display brightness and color temperature between the main and auxiliary display modules, improves the consistency of the display effects across the entire display device, and thus enhances the display quality of the display device. The display device can be used in the field of education and teaching to enhance interaction between teachers and students and improve learning efficiency.

[0227] The display device provided in the embodiments of the present disclosure may be any product or component with a display function, such as an LCD panel, an LCD television, an LCD billboard, a display, a mobile phone, or a navigation device.

[0228] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display device, wherein: Including main display module, auxiliary display module and adjustment unit, The main display module includes a main control circuit, and the main control circuit is configured to control the display of the main display module; The auxiliary display module includes an auxiliary control circuit, and the auxiliary control circuit is configured to control the display of the auxiliary display module; Any two of the main control circuit, the auxiliary control circuit and the adjustment unit are electrically connected, The main control circuit, the auxiliary control circuit and the adjustment unit are configured to adjust the display brightness and display color temperature of the main display module and the auxiliary display module to be consistent.

2. The display device according to claim 1, wherein The auxiliary display module includes a first module and a second module. The auxiliary control circuit includes a first control circuit and a second control circuit, wherein the first control circuit is configured to control the display of the first module; the second control circuit is configured to control the display of the second module; The adjustment unit includes a module brightness test element; The main control circuit is configured to adjust the brightness parameter of the main display module to change values one by one within a first set range, and at the same time control the module brightness test element to test and record actual display brightness data of the main display module under different brightness parameters; The first control circuit is configured to adjust the brightness parameter of the first module to change values one by one within the first set range, and at the same time control the module brightness test element to test and record actual display brightness data of the first module under different brightness parameters; The second control circuit is configured to adjust the brightness parameter of the second module to change value by value within the first setting range, and at the same time control the module brightness test element to test and record the actual display brightness data of the second module under different brightness parameters.

3. The display device according to claim 2, wherein: The main display module includes a main backlight source; The first module includes a first backlight source; The second module includes a second backlight source; The adjustment unit further includes a first backlight brightness test element, a second backlight brightness test element and a third backlight brightness test element; The main control circuit is further configured to adjust the brightness parameter of the main display module to change values one by one within the first setting range, and at the same time control the first backlight brightness test element to test and record the brightness parameter of the main backlight source under different brightness parameters; The first control circuit is further configured to adjust the brightness parameter of the first module to change value by value within the first set range, and at the same time control the second backlight brightness test element to test and record the brightness parameter of the first backlight source under different brightness parameters; The second control circuit is further configured to adjust the brightness parameter of the second module to change value by value within the first setting range, and at the same time control the third backlight brightness test element to test and record the brightness parameter of the second backlight source under different brightness parameters.

4. The display device according to claim 3, wherein A first opening is formed in the main backlight source; the first backlight brightness test element is located in the first opening; A second opening is formed in the first backlight source; The second backlight brightness testing element is located in the second opening; A third opening is defined in the second backlight source; and the third backlight brightness testing element is located in the third opening.

5. The display device according to claim 4, wherein The main display module also includes a first storage unit, The first module further includes a second storage unit, The second module further includes a third storage unit, The main control circuit is further configured to form a first lookup table by mapping the actual display brightness data of the main display module and the brightness parameter of the main backlight source one by one, and store the first lookup table in the first storage unit; The first control circuit is further configured to form a second lookup table by mapping the actual display brightness data of the first module and the brightness parameter of the first backlight source in a one-to-one correspondence, and store the second lookup table in the second storage unit; The second control circuit is further configured to form a third lookup table by one-to-one correspondence between the actual display brightness data of the second module and the brightness parameter of the second backlight source, and store the third lookup table in the third storage unit. The display device according to claim 5 , wherein: The main control circuit is further configured to adjust the brightness parameter of the main display module to a middle value within the first set range, and simultaneously control the first backlight brightness test element to test the current brightness parameter of the main backlight source under the brightness parameter; The first control circuit is further configured to adjust the brightness parameter of the first module to the middle value within the first setting range, and simultaneously control the second backlight brightness test element to test the current brightness parameter of the first backlight source under the brightness parameter; The second control circuit is further configured to adjust the brightness parameter of the second module to the middle value within the first setting range, and at the same time control the third backlight brightness test element to test the current brightness parameter of the second backlight source under the brightness parameter.

7. The display device according to claim 6, wherein: The main control circuit is electrically connected to the first control circuit and the second control circuit respectively; The main control circuit is further configured to: when the current brightness parameter of the main backlight source is greater than the When the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the first lookup table is retrieved, and the brightness parameter of the main backlight source having the same value as the current brightness parameter of the first backlight source is searched in the first lookup table, and then the brightness parameter of the main display module is adjusted to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table; The first control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, call the second lookup table, search the second lookup table for a brightness parameter of the first backlight source that is equal to the current brightness parameter of the main backlight source, and then adjust the brightness parameter of the first module to the brightness parameter corresponding to the actual display brightness data of the first module corresponding to the brightness parameter of the first backlight source in the second lookup table; The second control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, call the third lookup table, search the third lookup table for a brightness parameter of the second backlight source that is equal to the current brightness parameter of the main backlight source, and then adjust the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table; The main control circuit is further configured to, when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, call the first lookup table, and search the first lookup table for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then adjust the brightness parameter of the main display module to the brightness parameter of the main backlight source in the first lookup table corresponding to the actual display brightness data of the main display module. Degree parameter; The second control circuit is also configured to call the third lookup table and search the third lookup table for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the first backlight source when the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, and then adjust the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

8. The display device according to claim 7, wherein: The main control circuit is further configured to set a color temperature parameter of the main display module and control the module brightness test element to test the color temperature data of the main display module under the color temperature parameter; The first control circuit is further configured to adjust the color temperature parameters of the first module so that the color temperature data of the first module gradually increases by a set value within a second set range, form a fourth lookup table by mapping each color temperature parameter of the first module to the color temperature data corresponding to each color temperature parameter, and store the fourth lookup table in the second storage unit; The second control circuit is further configured to adjust the color temperature parameters of the second module so that the color temperature data of the second module gradually increases by the set value within the second set range, form a fifth lookup table by corresponding each color temperature parameter of the second module to the color temperature data corresponding to each color temperature parameter, and store the fifth lookup table in the third storage unit.

9. The display device according to claim 8, wherein The adjustment unit further includes a first color temperature test element, a second color temperature test element and a third color temperature test element. The first color temperature testing element is electrically connected to the main control circuit; The second color temperature testing element is electrically connected to the first control circuit; The third color temperature testing element is electrically connected to the second control circuit; The first color temperature testing element is configured to test a color temperature curve of the main display module under its color temperature parameters, and the main control circuit is further configured to transmit the color temperature curve of the main display module to the first control circuit and the second control circuit; The second color temperature testing element is configured to test the color temperature curve of the first module at each color temperature parameter thereof; the first control circuit is further configured to compare each color temperature curve of the first module with the color temperature curve of the main display module, and set the color temperature parameter corresponding to the color temperature curve of the first module whose comparison result is within a third set range as the color temperature parameter of the first module; The third color temperature testing element is configured to test the color temperature curve of the second module under its various color temperature parameters; the second control circuit is further configured to compare each color temperature curve of the second module with the color temperature curve of the main display module, and set the color temperature parameter corresponding to the color temperature curve of the second module whose comparison result is within the third set range as the color temperature parameter of the second module.

10. The display device according to claim 9, wherein The color temperature curve is a curve showing the color temperature data changing with grayscale. The grayscale range is 0 to 255; The comparison result of each color temperature curve of the first module and the color temperature curve of the main display module is the comparison result of the curves of color temperature data changing with grayscale of 30 to 255; The comparison results of the color temperature curves of the second module and the color temperature curve of the main display module are comparison results of curves in which the color temperature data changes with gray levels of 30 to 255.

11. The display device according to claim 9, wherein The first color temperature test element corresponds to the position of the main display module; The second color temperature test element corresponds to the position of the first module; The third color temperature testing element corresponds to the position of the second module.

12. The display device according to claim 7, wherein: Any two of the main control circuit, the first control circuit and the second control circuit are electrically connected via an I2C bus or a USB communication line.

13. The display device according to any one of claims 1 to 12, wherein: It also includes a voltage input circuit and a plurality of voltage conversion circuits, wherein the voltage input circuit and the plurality of voltage conversion circuits are electrically connected respectively; The voltage conversion circuit is configured to convert the voltage input by the voltage input circuit into a target voltage; The display device further includes a detection circuit, the detection circuit including a main controller and a plurality of detection devices, the main controller and the plurality of detection devices are electrically connected respectively; The plurality of voltage conversion circuits and the plurality of detection devices correspond to each other one by one and are respectively connected in series; The detection device is configured to detect whether the voltage conversion circuit connected in series with it is powered on, and send the detection result to the main controller; The main controller is configured to determine whether the multiple voltage conversion circuits are powered on in a set order based on the detection results sent by the multiple detection devices, and when the determination result is no, control the detection devices to cut off the circuits to which they are connected.

14. The display device according to claim 13, wherein: The detection device is configured to detect whether the voltage output by the voltage conversion circuit connected in series is greater than 1 / 2 of the target voltage, and when the detection result is yes, determine that the voltage conversion circuit connected in series is powered on.

15. The display device according to claim 13, wherein The detection device includes a trigger or a level detector.

16. The display device according to claim 12, wherein: The main display module is configured with a display parameter menu; The first module is configured with the display parameter menu; The main control circuit is further configured to adjust the display parameters of the main display module by adjusting the display parameter menu of the main display module; The first control circuit is further configured to adjust the display parameters of the first module and the second module by adjusting the display parameter menu of the first module; The display parameters include display brightness, display color temperature, display volume and display language.

17. The display device according to claim 12, wherein: The main display module is configured with a display parameter menu; The main control circuit is further configured to adjust the display parameters of the main display module, the first module and the second module by adjusting the display parameter menu of the main display module; The display parameters include display brightness, display color temperature, display volume and display language.

18. A method for adjusting a display device, wherein: The display device includes a main display module, a sub-display module and an adjustment unit. The main display module includes a main control circuit; the auxiliary display module includes an auxiliary control circuit; any two of the main control circuit, the auxiliary control circuit and the adjustment unit are electrically connected; The adjustment method includes the main control circuit, the auxiliary control circuit and the adjustment unit adjusting the display brightness and display color temperature of the main display module and the auxiliary display module to be consistent.

19. The method for adjusting a display device according to claim 18, wherein: The auxiliary display module includes a first module and a second module. The auxiliary control circuit includes a first control circuit and a second control circuit; the main control circuit electrically connected to the first control circuit and the second control circuit respectively; The adjustment unit includes a module brightness test element; The main display module includes a main backlight source; The first module includes a first backlight source; The second module includes a second backlight source; The adjustment unit further includes a first backlight brightness test element, a second backlight brightness test element and a third backlight brightness test element; The main display module also includes a first storage unit, The first module further includes a second storage unit, The second module further includes a third storage unit, The main control circuit, the auxiliary control circuit, and the adjustment unit adjust the display brightness of the main display module and the auxiliary display module to be consistent, including: The main control circuit adjusts the brightness parameter of the main display module to change values one by one within a first set range, and at the same time controls the module brightness test element to test and record actual display brightness data of the main display module under different brightness parameters; The first control circuit adjusts the brightness parameter of the first module to change values one by one within the first set range, and at the same time controls the module brightness test component to test and record actual display brightness data of the first module under different brightness parameters; The second control circuit adjusts the brightness parameter of the second module to change values one by one within the first setting range, and controls the module brightness test element to test and record actual display brightness data of the second module under different brightness parameters; The main control circuit adjusts the brightness parameter of the main display module to change values one by one within the first setting range, and at the same time controls the first backlight brightness test element to test and record the brightness parameter of the main backlight source under different brightness parameters; The first control circuit adjusts the brightness parameter of the first module to change value by value within the first setting range, and at the same time controls the second backlight brightness test element to test and record different brightness Brightness parameters of the first backlight source under parameters; The second control circuit adjusts the brightness parameter of the second module to change values one by one within the first setting range, and at the same time controls the third backlight brightness test element to test and record the brightness parameter of the second backlight source under different brightness parameters; The main control circuit forms a first lookup table by corresponding the actual display brightness data of the main display module to the brightness parameter of the main backlight source, and stores the first lookup table in the first storage unit; The first control circuit forms a second lookup table by corresponding the actual display brightness data of the first module to the brightness parameter of the first backlight source, and stores the second lookup table in the second storage unit; The second control circuit forms a third lookup table by corresponding the actual display brightness data of the second module to the brightness parameter of the second backlight source in a one-to-one manner, and stores the third lookup table in the third storage unit; The main control circuit adjusts the brightness parameter of the main display module to a middle value within the first setting range, and controls the first backlight brightness test element to test the current brightness parameter of the main backlight source under the brightness parameter; The first control circuit adjusts the brightness parameter of the first module to the middle value within the first setting range, and controls the second backlight brightness test element to test the current brightness parameter of the first backlight source under the brightness parameter; The second control circuit adjusts the brightness parameter of the second module to the middle value within the first setting range, and controls the third backlight brightness test element to test the current brightness parameter of the second backlight source under the brightness parameter; When the current brightness parameter of the main backlight source is greater than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table and searches the first lookup table for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then The brightness parameter of the main display module is adjusted to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table; When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the first control circuit calls the second lookup table, searches the second lookup table for the brightness parameter of the first backlight source that is equal to the current brightness parameter of the main backlight source, and then adjusts the brightness parameter of the first module to the brightness parameter corresponding to the actual display brightness data of the first module corresponding to the brightness parameter of the first backlight source in the second lookup table; When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is equal to the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table, searches the third lookup table for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the main backlight source, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table; When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the main control circuit calls the first lookup table, searches the first lookup table for the brightness parameter of the main backlight source that is equal to the current brightness parameter of the first backlight source, and then adjusts the brightness parameter of the main display module to the brightness parameter corresponding to the actual display brightness data of the main display module corresponding to the brightness parameter of the main backlight source in the first lookup table; When the current brightness parameter of the main backlight source is less than the current brightness parameter of the first backlight source and the current brightness parameter of the first backlight source is less than the current brightness parameter of the second backlight source, the second control circuit calls the third lookup table and searches for the brightness parameter of the second backlight source that is equal to the current brightness parameter of the first backlight source in the third lookup table, and then adjusts the brightness parameter of the second module to the brightness parameter corresponding to the actual display brightness data of the second module corresponding to the brightness parameter of the second backlight source in the third lookup table.

20. The method for adjusting a display device according to claim 19, wherein: The adjustment unit further includes a first color temperature test element, a second color temperature test element and a third color temperature test element. The first color temperature testing element is electrically connected to the main control circuit; The second color temperature testing element is electrically connected to the first control circuit; The third color temperature testing element is electrically connected to the second control circuit; The main control circuit, the auxiliary control circuit, and the adjustment unit adjust the display color temperatures of the main display module and the auxiliary display module to be consistent, including: The main control circuit sets the color temperature parameter of the main display module and controls the module brightness test element to test the color temperature data of the main display module under the color temperature parameter; The first control circuit adjusts the color temperature parameters of the first module so that the color temperature data of the first module gradually increases by a set value within a second set range, forms a fourth lookup table by mapping each color temperature parameter of the first module to the color temperature data corresponding to each color temperature parameter, and stores the fourth lookup table in the second storage unit; The second control circuit adjusts the color temperature parameter of the second module so that the color temperature data of the second module gradually increases by the set value within the second set range, forms a fifth lookup table by mapping each color temperature parameter of the second module to the color temperature data corresponding to each color temperature parameter, and stores the fifth lookup table in the third storage unit; The first color temperature testing element tests the color temperature curve of the main display module under its color temperature parameters, and the main control circuit transmits the color temperature curve of the main display module to the first control circuit and the second control circuit; The second color temperature testing element tests the color temperature curve of the first module under various color temperature parameters. The first control circuit compares the color temperature curves of the first module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the first module whose comparison result is within a third set range as the color temperature parameter of the first module. The third color temperature testing element tests the color temperature curve of the second module under its various color temperature parameters; the second control circuit compares each color temperature curve of the second module with the color temperature curve of the main display module, and sets the color temperature parameter corresponding to the color temperature curve of the second module whose comparison result is within the third set range as the color temperature parameter of the second module.

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