WO2019170078A1 - Chromaticity coordinate calibration method, apparatus and system - Google Patents

Abstract

Disclosed is a chromaticity coordinate calibration method, comprising: controlling a display screen of a terminal to display a display frame to be subjected to color calibration with a default color temperature level and a preset brightness level; obtaining chromaticity coordinates, on a chromaticity diagram, of a color to be calibrated displayed on the display screen of the terminal; and in response to the determination result that the chromaticity coordinates, on the chromaticity diagram, of the color to be calibrated displayed on the display screen satisfy a calibration condition, determining a calibration color temperature level corresponding to at least one brightness level of the display screen, and sending the calibration color temperature level corresponding to the at least one brightness level to the terminal. Also disclosed are a chromaticity coordinate calibration apparatus and device, and a storage medium.

Description

Color coordinate calibration method, device and system

The present application claims priority to Chinese Patent Application No. 20110118055, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present disclosure relates to terminal technologies, for example, to a color coordinate calibration method, apparatus, and system.

Background technique

Most of the display screens use a liquid crystal display. This type of screen is a passively illuminated screen. The color of the screen depends on the color of the backlight. The backlight is backlit by a Light Emitting Diode (LED). For example, the LED product uses a blue chip. The yellow fluorescent rubber is synthesized into white light. Due to the fluctuation range of the blue chip wavelength of the raw materials used in the LED products, the amount of the fluorescent glue in each LED product is not completely affected by the error of the dispensing machine, so each LED product The spectrum is different. In the related art, the control tolerance of the color coordinates of the LED backlight is 0.03, and the range is very large, resulting in poor display consistency of the display screen of the terminal.

Summary of the invention

The embodiment of the present disclosure provides a color coordinate calibration method, which can reduce the unevenness of the hue of the display screen of the terminal, thereby improving the consistency of the display effect of the display screen of the terminal.

In an embodiment, an embodiment of the present disclosure provides a color coordinate calibration method, which is applied to a server, and includes:

The display screen of the control terminal displays a display screen of the color to be calibrated of the default color temperature level and the preset brightness level;

Obtaining a color coordinate of the color to be calibrated displayed on a display screen of the terminal on a chromaticity diagram;

Determining, according to a determination result that the color coordinate of the color to be calibrated on the chromaticity diagram meets the calibration condition, the calibration color temperature level corresponding to the at least one brightness level of the display screen, the at least one brightness The calibration color temperature level corresponding to the level is sent to the terminal.

In an embodiment, an embodiment of the present disclosure further discloses a color coordinate calibration method, which is applied to a terminal, and includes:

Receiving an instruction to display a display screen of a color to be calibrated of a default color temperature level and a preset brightness level on the display screen based on the instruction;

Receiving and storing at least one calibration color temperature level corresponding to the brightness level, and writing a calibration color temperature level corresponding to the brightness level of the backlight of the display screen into the color temperature register;

The calibrated screen is displayed based on the calibration color temperature level in the color temperature register.

In an embodiment, an embodiment of the present disclosure provides a color coordinate calibration apparatus, including:

a control module, configured to display a display screen of the color to be calibrated of the default color temperature level and the preset brightness level on the display screen of the control terminal;

Obtaining a module, configured to acquire, after the terminal enters the calibration mode, the color coordinates of the color to be calibrated displayed on the display screen of the terminal on the chromaticity diagram;

a calibration module, configured to determine a calibration color temperature level corresponding to at least one brightness level of the display screen in response to a determination result that the color coordinate of the color to be calibrated displayed on the chromaticity diagram meets a calibration condition The calibration color temperature level corresponding to the at least one brightness level is sent to the terminal.

In an embodiment, an embodiment of the present disclosure provides an apparatus including a processor and a computer readable storage medium having instructions stored therein when the instructions are executed by the processor The method described in any of the above embodiments is implemented.

Embodiments of the present disclosure propose a computer readable storage medium having stored thereon a computer program that, when executed by a processor, implements the method described in any of the above embodiments.

DRAWINGS

The drawings are intended to provide an understanding of the technical solutions of the present disclosure, and constitute a part of the specification, and the embodiments of the present application are used to explain the technical solutions of the present disclosure, and do not constitute a limitation of the technical solutions of the present disclosure.

FIG. 1 is a flowchart of a color coordinate calibration method according to an embodiment of the present disclosure;

2 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

3 is a schematic diagram of a color temperature level-color coordinate curve of an A screen and a B screen according to an embodiment of the present disclosure;

4 is a schematic diagram of a color temperature level-color coordinate curve of an adjusted A screen and a B screen according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of another color coordinate calibration method according to an embodiment of the present disclosure;

FIG. 6 is a flowchart of still another color coordinate calibration method according to an embodiment of the present disclosure;

FIG. 7 is a flowchart of still another color coordinate calibration method according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a color coordinate calibration apparatus according to an embodiment of the present disclosure;

FIG. 9 is a flowchart of still another color coordinate calibration method according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of an apparatus according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of a color coordinate calibration system according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. The embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other without conflict.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although the logical order is shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than the ones described herein.

Embodiment 1

Referring to FIG. 1, the present application proposes a color coordinate calibration method, including:

Step 100: The display screen of the control terminal displays a display screen of the color to be calibrated of the default color temperature level and the preset brightness level.

In the present application, the terminal may be any one of the following: a personal computer (PC), a mobile terminal, a portable computer (PAD), and the like.

The above terminal may include one display screen, or two display screens, or two or more display screens. FIG. 2 is a schematic structural diagram of a terminal of the present application. As shown in FIG. 2, the terminal includes: a central processing unit (CPU), N display screens; wherein N is an integer greater than or equal to 1. In an embodiment, the terminal further includes at least one of the following: a memory, a sensor, and other peripherals.

In this application, the terminal can be controlled to enter the calibration mode in various ways. For example, the terminal is controlled to enter the calibration mode by issuing a calibration command to the terminal. After receiving the calibration command, the terminal controls all the screens to display the color to be calibrated under the default color temperature level; wherein the color to be calibrated may be any of the following: white, red, green, blue, etc., and set the backlight of the display. The brightness level is the preset brightness level.

In an embodiment, the preset brightness level may be any one of the brightness levels, for example, the maximum brightness level.

In an embodiment, the preset brightness level may be included in the calibration command.

Step 110: Obtain color coordinates of the color to be calibrated displayed on the display screen of the terminal on the chromaticity diagram.

In the present application, the color coordinates of the color to be calibrated displayed on all the display screens of the terminal on the chromaticity diagram can be detected by controlling the color analyzer.

In the present application, the color coordinates include x-axis coordinates and y-axis coordinates, that is, (x, y). In the chromaticity diagram, a plurality of color coordinates and a plurality of colors are in one-to-one correspondence, and at the same time, the plurality of color coordinates are in one-to-one correspondence with the plurality of color temperature levels.

Step 120: responsive to the determination result that the color coordinate of the to-be-calibrated color on the chromaticity diagram meets the calibration condition, and determine a calibration color temperature level corresponding to at least one brightness level of the display screen, A calibration color temperature level corresponding to at least one brightness level is sent to the terminal.

In an embodiment, the satisfying the calibration condition comprises one of the following:

In the case that the terminal includes one of the display screens, the color coordinates of the color to be calibrated displayed on the display screen are compared with the target color coordinate area, and the display screen displays The color coordinates of the calibration color on the chromaticity diagram are not in the target color coordinate region; wherein the target color coordinate region is included in the target color coordinate value, and the distance from the target color coordinate value is less than or equal to the first An area of all color coordinate values of a predetermined threshold;

In the case that the terminal includes two of the display screens, the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens are compared on the chromaticity diagram, and the distance between the two color coordinates is Greater than a second preset threshold;

In the case that the terminal includes more than three of the display screens, compare the color coordinates of the to-be-calibrated colors displayed on all the display screens on the chromaticity diagram, the three or more of the display screens The distance of the color coordinates of the color to be calibrated displayed by any two of the display screens is greater than a third preset threshold.

In the present application, when the terminal includes a display screen, the color coordinate of the color to be calibrated displayed on the chromaticity diagram displayed by the obtained display screen is compared with the target color coordinate area, and the color coordinate is in the target color coordinate area. When it is inside, it is not necessary to calibrate the color coordinate; when the color coordinate is not in the target color coordinate area, the color coordinate is to be calibrated. Wherein, the target color coordinate region is a region including the target color coordinate value, and all the color coordinate values whose distance from the target color coordinate value is less than or equal to a first preset threshold (for example, 1‰), and the target color coordinate value is a chromaticity diagram. The color coordinate value of the standard color to be calibrated or the color coordinate value of the custom color to be calibrated.

The color coordinate of the color to be calibrated displayed on the chromaticity diagram in the target color coordinate area means that the distance between the color coordinate and the target color coordinate value is less than or equal to a first preset threshold.

When the terminal includes two display screens, compare the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens on the chromaticity diagram, when the distance between the two color coordinates is less than or equal to the second preset threshold When the two color coordinates are not calibrated, the two color coordinates are calibrated when the distance between the two color coordinates is greater than the second predetermined threshold.

In this application, according to the formula

Calculate the distance of two color coordinates; where (x ₁ , y ₁ ) is one of the color coordinates, and (x ₂ , y ₂ ) is the other color coordinate. For example, (x ₁ , y ₁ ) is the color coordinate of the color to be calibrated displayed on the chromaticity diagram displayed by the display screen, and (x ₂ , y ₂ ) is the target color coordinate value. For another example, (x ₁ , y ₁ ) is the color coordinate of the color to be calibrated displayed on the chromaticity diagram displayed by the first display screen, and (x ₁ , y ₁ ) is the color to be calibrated displayed by the second display screen. The color coordinates on the chromaticity diagram.

When the terminal includes three or more than three display screens, compare the color coordinates of the to-be-calibrated colors displayed on all the display screens on the chromaticity diagram, when any two of the three or more display screens are displayed When the distance of the color coordinate of the color to be calibrated is greater than the third preset threshold, it is determined that the color coordinates of the color to be calibrated displayed on any two of the display screens are calibrated on the chromaticity diagram; when more than three When the color coordinates of the to-be-calibrated color displayed on any of the two display screens in the chromaticity diagram are less than or equal to the third preset threshold, it is determined that the color coordinates are not required to be calibrated.

For example, for the terminals of three display screens (A screen, B screen, and C screen, respectively), the distances of the three sets of color coordinates are calculated, that is, under the preset brightness level, all the displays display the default color temperature level. Calibrate the color screen.

The distance between the color coordinates of the A screen and the color coordinates of the B screen is denoted as S ₁ ;

The distance between the color coordinates of the A screen and the color coordinates of the C screen is denoted as S ₂ ;

The distance between the color coordinates of the B screen and the color coordinates of the C screen is denoted as S ₃ ;

Then, when S ₁ , S ₂ and S ₃ are both less than or equal to the third preset threshold, it is determined that the color coordinates are not required to be calibrated when S ₁ , S ₂ or S _{3 is} greater than the third preset threshold. It is determined that the above color coordinates are to be calibrated.

In an embodiment, the first preset threshold, the second preset threshold, and the third preset threshold may be set according to actual conditions, and the first preset threshold, the second preset threshold, and the third preset threshold may be the same. It may not be the same.

The following method can be used to determine the calibration color temperature level corresponding to at least one brightness level of the display:

Obtaining color coordinates corresponding to part or all of the color temperature levels corresponding to at least one brightness level of the display screen; for each of the preset brightness levels, determining a calibration color temperature level according to color coordinates corresponding to each of the partial or all color temperature levels.

In order to prevent the screen tone from being too cold after calibration, or too warm, the calibration color temperature level corresponding to the preset brightness level may be determined based on the color coordinates corresponding to the color temperature level of the intermediate region corresponding to each preset brightness level. For example, in the case where the display has a total of 256 color temperature levels, the intermediate area number can be selected from 97 color temperature levels to 160 color temperature levels.

Among them, the calibration color temperature level includes one of the following:

When the terminal includes a display screen, the color temperature level of the color coordinate having the smallest distance from the target color coordinate value;

The color temperature level of the N display screens with the smallest distance of color coordinates when the terminal includes at least two display screens.

For example, when the terminal includes two display screens, the color temperature levels of the N display screens with the smallest distance of the color coordinates are satisfied.

a minimum color temperature level of the first display screen and a color temperature level of the second display screen; wherein (x ₁ , y ₁ ) is a color coordinate corresponding to a color temperature level of the first display screen, and (x ₂ , y ₂ ) is the first The color coordinate corresponding to a color temperature level of the second display.

When the terminal includes three or more display screens, the color temperature level of the N display screens with the smallest distance of the color coordinates refers to the distance of the color coordinates of the color to be calibrated displayed on the chromaticity diagram of any two display screens is smaller than Or equal to the third preset threshold, ie

Less than or equal to the third preset threshold; for n display screens, where m ∈ [1, n], i ∈ [1, n].

The color coordinates corresponding to at least one brightness level of the display screen of the terminal (which may be understood as at least one preset brightness level, that is, at least one brightness level is preset) may be obtained in a plurality of manners. For example, by issuing a calibration command to the terminal, that is, issuing a first calibration command to the terminal, the first calibration command includes a first brightness level and a first color temperature level; and the terminal receives the first calibration command to set the brightness of the backlight. The level is the first brightness level, and the color picture to be calibrated at the first color temperature level is displayed, and the color coordinate of the color to be calibrated displayed on the display screen of the color analyzer is controlled to be detected; the second calibration is continued to be sent to the terminal. The second calibration command includes a first brightness level and a second color temperature level; the terminal receives the second calibration command, sets the brightness level of the backlight to the first brightness level, and displays the color picture to be calibrated at the second color temperature level, and controls The color analyzer detects the color coordinates of the color to be calibrated displayed on the chromaticity diagram of the display screen of the terminal; until the color coordinates corresponding to some or all of the color temperature levels of the first brightness level are obtained.

Sending a third calibration command to the terminal, where the third calibration command includes a second brightness level and a first color temperature level; the terminal receives the third calibration command, sets the brightness level of the backlight to the second brightness level, and displays the first color temperature level. The color picture to be calibrated is controlled to control the color coordinate of the color to be calibrated displayed on the display screen of the color analyzer on the chromaticity diagram; the fourth calibration instruction is further sent to the terminal, and the fourth calibration instruction includes the second brightness level and the The second color temperature level; the terminal receives the fourth calibration command, sets the brightness level of the backlight to the second brightness level, displays the color picture to be calibrated under the second color temperature level, and controls the color analyzer to detect the color to be calibrated displayed on the display screen of the terminal. The color coordinates on the chromaticity diagram; until the color coordinates corresponding to some or all of the color temperature levels of the second brightness level are obtained.

And so on, until the color coordinates corresponding to some or all of the color temperature levels of all brightness levels are obtained.

That is to say, the color coordinates corresponding to each color temperature level are obtained by color analyzer detection. If the terminal has M (such as 128 or 256) color temperature levels, the color analyzer can be used to detect M times to obtain a brightness level. The color coordinates corresponding to all color temperature levels.

In an embodiment, a color analyzer may also be used to detect color coordinates corresponding to at least two color temperature levels of the same brightness level, and color coordinates corresponding to other color temperature levels of the brightness level may be performed according to color coordinates corresponding to at least two color temperature levels. Interpolation is obtained.

In the present application, the terminal receives the calibration color temperature level corresponding to the at least one brightness level, and saves the calibration color temperature level corresponding to the at least one brightness level, for example, saves the calibration color temperature level corresponding to the at least one brightness level to the non-volatile memory. After setting the brightness level of the backlight, the calibration color temperature level corresponding to the brightness level of the backlight is written into the color temperature register. If the terminal receives a calibration color temperature level corresponding to a preset brightness level, the calibration color temperature level can be written to the color temperature register. The terminal calculates an actual scale value of the primary color light of the display screen based on the scale value of the primary color light of the display screen and the calibration color temperature level, and displays based on the actual scale value of the primary color light of the display screen.

For example, if the terminal has two display screens, A screen and B screen respectively, and A screen and B screen have 128 color temperature levels (the number of color temperature levels set by different manufacturers is different); then, set A screen and B The brightness level of the backlight of the screen is the first brightness level, and the color coordinate corresponding to the color temperature level of the A screen is 0 to 127, which is (x _A0 , y _A0 ), (x _A1 , y _A1 ), respectively. ......, (x _A127 , y _A127 ); using a color analyzer to measure the color coordinates of the B-screen 0 to 127 color temperature levels, respectively (x _B0 , y _B0 ), (x _B1 , y _B1 ), ..., (x _B127 , y _B127 ).

Adopt formula

Calculating the distance of the color coordinate corresponding to each color temperature level of the A screen and the color coordinate corresponding to each color temperature level of the B screen; wherein (x ₁ , y ₁ ) is the color coordinate corresponding to a color temperature level of the A screen, (x ₂ , y ₂ ) is the color coordinate corresponding to a color temperature level of the B screen; then selecting the color temperature level of the A screen corresponding to the two color coordinates with the smallest distance and the color temperature level of the B screen, for example, the 60th color temperature level of the A screen corresponds to The color coordinate (x _A60 , y _A60 ) and the color coordinate (x _B70 , y _B70 ) corresponding to the 70th color temperature level of the B screen have the smallest distance, then the 60th color temperature level of the A screen and the 70th color temperature level of the B screen. Send to the terminal, after receiving the 60th color temperature level of the A screen and the 70th color temperature level of the B screen, the terminal writes the level 60 to the default color temperature register of the A screen, and writes the level 70 to the default color temperature register of the B screen. in.

The color coordinate calibration process may be a calibration performed at the same preset brightness level of the display screen, that is, a color temperature level having the smallest distance of the color coordinates of the preset brightness level is obtained, but at another preset brightness level. The distance of the color coordinates corresponding to the color temperature level is not necessarily the smallest.

Therefore, the color temperature level at which the distance of the color coordinates corresponding to the at least two preset brightness levels is the smallest is determined. Thus, when the terminal is displayed, it is determined whether to reset the default color temperature level according to the brightness level of the backlight of the display screen. In an embodiment, when the brightness level of the backlight of the display screen is within the target brightness level range, it is not necessary to reset the default color temperature level; when the brightness level of the backlight of the display screen is not within the target brightness level range, the device is reset. The default color temperature level is determined; wherein the target brightness level range is a brightness level range including a target brightness level, and the target brightness level is a brightness level corresponding to the currently set default color temperature level.

When resetting the default color temperature level, first determine the target brightness level range to which the brightness level of the backlight of the display belongs, and then, in the correspondence between the brightness level range and the calibration color temperature level, look for the brightness level of the backlight of the display screen. The calibration color temperature level corresponding to the target brightness level range, and the default color temperature level is set to the found calibration color temperature level.

In the above color coordinate calibration process, when the distance between the color coordinate corresponding to the default color temperature level and the template color coordinate value at one brightness level is greater than or equal to a preset threshold, or the default color temperature level of the N display screens determined under one brightness level corresponds to Adjusting at least one primary color corresponding to the lowest color temperature level and/or the highest color temperature level of the at least one display screen before determining the calibration color temperature level corresponding to each preset brightness level when the distance of the color coordinates is greater than or equal to the preset threshold value The ratio of the light values such that the color temperature level-color coordinate curves of all the display screens intersect, and the adjusted ratio values of the lowest color temperature level and/or the highest color temperature level of the at least one of the display screens are transmitted to The terminal.

In an embodiment, when the terminal includes two display screens, the y coordinate (or x coordinate) of the color coordinate corresponding to the lowest color temperature level of the first display screen is greater than the color coordinate corresponding to the lowest color temperature level of the second display screen. The y coordinate (or x coordinate), and the y coordinate (or x coordinate) of the color coordinate corresponding to the highest color temperature level of the first display screen is greater than the y coordinate (or x coordinate) of the color coordinate corresponding to the highest color temperature level of the second display screen. And adjusting a ratio value of the at least one primary color light corresponding to the highest color temperature level of the first display screen or the second display screen, so that the y coordinate (or the x coordinate) of the color coordinate corresponding to the highest color temperature level of the first display screen is smaller than The y coordinate (or x coordinate) of the color coordinate corresponding to the highest color temperature level of the second display screen, then the color temperature level of the first display screen - the y coordinate (or x coordinate) curve of the color coordinate intersects.

When the y coordinate (or x coordinate) of the color coordinate corresponding to the lowest color temperature level of the first display screen is smaller than the y coordinate (or x coordinate) of the color coordinate corresponding to the lowest color temperature level of the second display screen, and the highest of the first display screen When the y coordinate (or x coordinate) of the color coordinate corresponding to the color temperature level is smaller than the y coordinate (or x coordinate) of the color coordinate corresponding to the highest color temperature level of the second display screen, the highest of the first display screen or the second display screen can be adjusted. a ratio of the color temperature level corresponding to the at least one primary color light such that the y coordinate (or x coordinate) of the color coordinate corresponding to the highest color temperature level of the first display screen is greater than the y coordinate of the color coordinate corresponding to the highest color temperature level of the second display screen (or x coordinate), then the color temperature level of the first display - the y coordinate (or x coordinate) curve of the color coordinates intersect.

When the terminal includes three or more display screens, the color temperature level-color coordinate curves of the first display screen and the second display screen are intersected in the above manner, so that the calibration color temperature levels of the first display screen and the second display screen correspond to each other. The distance of the color coordinate is less than or equal to the third preset threshold, and then the color temperature level of the first display screen (or the second display screen) and the third display screen are intersected in the above manner, so that the first display The distance of the color coordinate corresponding to the calibration color temperature level of the screen (or the second display screen) and the third display screen is less than or equal to the third preset threshold value, ..., and so on, so that any two display screens The color temperature level-color coordinate curves are all intersected, and the distance of the color coordinates corresponding to the calibration color temperature levels of any two display screens is less than or equal to the third preset threshold.

If there are still two display screens whose color coordinates corresponding to the calibration color temperature level are greater than the third preset threshold after the adjustment, the color temperature level-color coordinate curve is re-adjusted.

For example, if the terminal includes three display screens, namely A screen, B screen and C screen, the color temperature level-color coordinate curve of the A screen and the B screen are intersected in the above manner, so that the calibration color temperature levels of the A screen and the B screen correspond to each other. The distance of the color coordinate is less than or equal to the third preset threshold, and then the color temperature level-color coordinate curve of the A screen and the C screen are intersected in the above manner, so that the distance of the color coordinate corresponding to the calibration color temperature level of the A screen and the C screen is less than Or equal to the third preset threshold. Finally, it is confirmed whether the distance of the color coordinate corresponding to the calibration color temperature level of the B screen and the C screen is less than or equal to the third preset threshold. If yes, the calibration is completed; if not, the C is readjusted. The color temperature level-color coordinate curve of the screen is such that the distance of the color coordinate corresponding to the calibration color temperature level of the A screen and the C screen is less than or equal to the third preset threshold, and the distance of the color coordinate corresponding to the calibration color temperature level of the B screen and the C screen is less than Or equal to the third preset threshold. Other cases and so on.

Receiving, by the terminal, a ratio value of the at least one primary color light level corresponding to the lowest color temperature level and/or the highest color temperature level of the adjusted at least one of the display screens, and at least the minimum color temperature level of the adjusted at least one of the display screens Setting a proportional value of the primary color light to a lowest color temperature register of the corresponding display screen, and setting a ratio value of the at least one primary color light corresponding to the highest color temperature level of the adjusted at least one of the display screens to a highest color temperature register of the corresponding display screen .

Wherein, after the ratio of the minimum color temperature level (or the highest color temperature level) corresponding to the at least one primary color light is adjusted, the color coordinate corresponding to the lowest color temperature level (or the highest color temperature level) is also changed accordingly, so that the color temperature level-color The slope of the coordinate curve also changes accordingly. Therefore, the color coordinates corresponding to other color temperature levels need to be re-determined, that is, the color coordinates corresponding to other color temperature levels can be determined according to the color coordinates corresponding to the lowest color temperature level and the color coordinates corresponding to the highest level. obtain.

Among them, the primary color light is red, blue, and green.

Wherein, the color coordinate range corresponding to the adjustment range of the ratio value of the at least one primary color light corresponding to the lowest color temperature level is (A-offset1, B-offset1) to (A, B), and the at least one primary color corresponding to the highest color temperature level The color coordinate range corresponding to the adjustment range of the light proportional value is (A, B) to (A+offset1, B+offset1); wherein (A, B) is the standard color coordinate of the color to be calibrated, and offset1 and offset2 are corresponding The adjustment range, when the value is 0.16, ensures that the toned color after calibration is not too cold or warm, which improves the calibration effect. For example, when the standard color coordinate of the white screen is (0.3, 0.32), the range of the color coordinate corresponding to the adjustment range of the at least one primary color light corresponding to the lowest color temperature level is (0.284, 0.304) to (0.3, 0.32). The adjustment range of the ratio value of the at least one primary color light corresponding to the highest color temperature level corresponds to a color coordinate range of (0.3, 0.32) to (0.316, 0.336). Adjustment within this range ensures that the calibrated tones are not too cold or warm, improving calibration.

For example, the terminal includes two display screens, A screen and B screen respectively, and FIG. 3 is a color temperature level-color coordinate curve diagram of the A screen and the B screen, as shown in FIG. 3, the curve 1 is the color temperature level of the A screen. The x coordinate curve of the coordinate, the curve 2 is the color temperature level of the A screen - the y coordinate curve of the color coordinate, the curve 3 is the color temperature level of the B screen - the x coordinate curve of the color coordinate, and the curve 4 is the color temperature level of the B screen - the color coordinate Y coordinate curve.

According to FIG. 3, the color temperature level-color coordinate curve of the A screen and the B screen have no intersection point, and the minimum value of the distance between the color coordinate of the A screen and the color coordinate of the B screen is 0. 3 or less in the brightness level of 0 to 100. The minimum value of the distance between the color coordinate of the A screen and the color coordinate of the B screen is less than 0.002 under the brightness level of 200, and the minimum value of the distance between the color coordinate of the A screen and the color coordinate of the B screen is less than 0.001 at the brightness level of 201 to 255. . That is to say, only the minimum value of the distance between the color coordinates of the A screen and the color coordinates of the B screen under the brightness level of 201 to 255 is less than or equal to the second preset threshold, and the color coordinates of the A screen and the color of the B screen under other brightness levels. The minimum value of the distance of the coordinates is greater than or equal to the second predetermined threshold. Then, after the color coordinate calibration of 0 to 200 brightness level, the condition cannot be satisfied, and at this time, the ratio of the minimum color temperature level of the A screen and/or the B screen and/or the minimum color temperature level corresponding to the highest color temperature level can be adjusted. The color temperature level-color coordinate curves of the A screen and the B screen are intersected.

As shown in FIG. 3, since the x coordinate of the color coordinate corresponding to the lowest color temperature level of the A screen is smaller than the x coordinate of the color coordinate corresponding to the lowest color temperature level of the B screen, the x coordinate of the color coordinate corresponding to the highest color temperature level of the A screen is smaller than B. The x coordinate of the color coordinate corresponding to the highest color temperature level of the screen. Therefore, the ratio of the red, green, and blue color modes (Red Green Blue, RGB) of the color coordinate corresponding to the highest color temperature level of the A or B screen can be adjusted, so that the A screen The x coordinate of the color coordinate corresponding to the highest color temperature level is greater than the x coordinate of the color coordinate corresponding to the highest color temperature level of the B screen, then the color temperature level of the A screen and the x coordinate curve of the color coordinate intersect, as shown in FIG. 4;

Since the y coordinate of the color coordinate corresponding to the lowest color temperature level of the A screen is smaller than the y coordinate of the color coordinate corresponding to the lowest color temperature level of the B screen, the y coordinate of the color coordinate corresponding to the highest color temperature level of the A screen is smaller than the highest color temperature level of the B screen. The y coordinate of the color coordinate, therefore, the RGB ratio of the color coordinate corresponding to the highest color temperature level of the A screen or the B screen can be adjusted, so that the y coordinate of the color coordinate corresponding to the highest color temperature level of the A screen is greater than the highest color temperature of the B screen. The y coordinate of the color coordinate corresponding to the level, then the color temperature level of the A screen - the y coordinate curve of the color coordinate intersects, as shown in FIG.

Embodiment 2

The color coordinate calibration method of the present application will be described below by way of example.

Example one

In this embodiment, the mobile terminal includes a display screen for calibrating the color coordinates of the display screen at a maximum brightness level, including:

Step 500: The server controls the mobile terminal to enter a calibration mode.

In this step, the server sends a calibration command to the mobile terminal, and after receiving the calibration command, the terminal controls the display screen to display a white screen under the default color temperature level, and sets the brightness level of the backlight of the display screen to the maximum brightness level.

Step 501: After the mobile terminal enters the calibration mode, the server controls the color analyzer to detect the color coordinates of the display screen of the mobile terminal.

Step 502: The server determines whether the color coordinate of the display screen is within the target color coordinate area. If yes, the process ends; if not, the process proceeds to step 503.

In this step, the target color coordinate area is an area including the target color coordinate value, and all the color coordinate values whose distance from the target color coordinate value is less than or equal to the first preset threshold (for example, 1‰), and the target color coordinate value is color. The color coordinate value of the standard color to be calibrated on the graph.

Step 503: The server acquires color coordinates corresponding to part or all of the color temperature levels corresponding to the maximum brightness level of the display screen.

Step 504: The server calculates a distance between a color coordinate corresponding to each color temperature level and a color coordinate value of the standard white.

Step 505: The server sends a color temperature level (ie, a calibration color temperature level) that minimizes the distance between the color coordinate and the standard white color coordinate value to the mobile terminal.

Step 506: The mobile terminal writes the received color temperature level into the color temperature register of the display screen, and displays according to the color temperature level in the color temperature register.

In this step, at the time of display, the mobile terminal calculates the RGB actual scale value of the display screen according to the RGB scale value of the display screen and the color temperature level in the color temperature register, and displays based on the RGB actual scale value of the display screen.

Example two

In this embodiment, the mobile terminal includes two display screens, namely an A screen and a B screen, and calibrates the color coordinates of the display screen at the maximum brightness level, including:

Step 600: The server controls the mobile terminal to enter a calibration mode.

In this step, the server sends a calibration command to the mobile terminal, and after receiving the calibration command, the terminal controls the A screen and the B screen to display the white screen under the default color temperature level, and sets the brightness level of the backlight of the A screen and the B screen to the maximum brightness. grade.

Step 601: After the mobile terminal enters the calibration mode, the server controls the color analyzer to detect the color coordinates of the display screen of the mobile terminal.

Step 602: The server determines whether the distance between the color coordinate of the A screen and the color coordinate of the B screen is less than or equal to the second preset threshold. If yes, the process ends; if not, step 603 is continued.

Step 603: The server acquires color coordinates corresponding to part or all of the color temperature levels corresponding to the maximum brightness levels of the A screen and the B screen.

Step 604: The server calculates a distance between a color coordinate corresponding to each color temperature level of the A screen and a color coordinate corresponding to each color temperature level of the B screen.

Step 605: The server sends the color temperature level (ie, the calibration color temperature level) of the A screen corresponding to the two color coordinates with the smallest distance and the color temperature level of the B screen (ie, the calibration color temperature level) to the mobile terminal.

Step 606: The mobile terminal writes the color temperature level of the A screen into the color temperature register of the A screen, and writes the color temperature level of the B screen into the color temperature register of the B screen; and based on the color temperature register of the A screen and the color temperature register of the B screen The color temperature level is displayed.

In this step, during display, the mobile terminal calculates the RGB actual scale value of the display screen of the A screen according to the RGB scale value of the display screen of the A screen and the color temperature level of the color temperature register of the A screen, and the RGB of the display screen based on the A screen. The actual scale value is displayed; the RGB actual scale value of the B screen display screen is calculated according to the RGB scale value of the B screen display screen and the color temperature level in the B screen color temperature register, based on the actual RGB ratio value of the B screen display screen. display.

Example three

In this embodiment, the mobile terminal includes two display screens, namely an A screen and a B screen, and the color coordinates of the display screen are calibrated under three different brightness levels, including:

Step 700: The server controls the mobile terminal to enter a calibration mode.

In this step, the server sends a calibration command to the mobile terminal, and after receiving the calibration command, the terminal controls the A screen and the B screen to display the white screen under the default color temperature level, and sets the brightness level of the backlight of the A screen and the B screen to the maximum brightness. grade.

Step 701: After the mobile terminal enters the calibration mode, the server controls the color analyzer to detect the color coordinates of the display screen of the mobile terminal.

Step 702: The server determines whether the distance between the color coordinate of the A screen and the color coordinate of the B screen is less than or equal to the second preset threshold. If yes, the process ends; if not, proceed to step 703.

Step 703: The server separately acquires color coordinates corresponding to part or all of the color temperature levels of the A screen and the B screen corresponding to the three different brightness levels.

For example, the server acquires color coordinates corresponding to partial or full color temperature levels of the A screen and the B screen corresponding to the brightness levels of the backlights of 85, 170, and 255, respectively. Of course, it is also possible to obtain color coordinates corresponding to some or all of the color temperature levels of the A and B screens corresponding to the brightness level, and the more the number of brightness levels obtained, the higher the accuracy.

Step 704: For each brightness level, the server calculates the distance between the color coordinates corresponding to each color temperature level of the A screen and the color coordinates corresponding to each color temperature level of the B screen.

Step 705: The server sends the color temperature level of the A screen corresponding to the two color coordinates with the smallest distance of all brightness levels and the color temperature level of the B screen to the mobile terminal.

For example, if the color temperature level of the A screen corresponding to the two color coordinates having the smallest brightness level is 85 is 52, the color temperature level of the B screen is 63; the A screen of the two color coordinates corresponding to the minimum distance of the brightness level 170 is A screen. The color temperature level is 58, the color temperature level of the B screen is 66; the color temperature level of the A screen corresponding to the two color coordinates with the minimum brightness level of 255 is 70, and the color temperature level of the B screen is 69; then, it can be considered that the backlight level For 0 to 100, the color temperature level of the A screen is 52, the color temperature level of the B screen is 63; when the backlight level is 101 to 200, the color temperature level of the A screen is 58, the color temperature level of the B screen is 66; the backlight level is 201. At ~255, the color temperature level of the A screen is 70, and the color temperature level of the B screen is 69.

Step 706: The mobile terminal saves the color temperature level of the A screen corresponding to the three different brightness levels and the color temperature level of the B screen; and displays according to the color temperature level of the A screen and the color temperature level of the B screen.

In this step, the mobile terminal can write three sets of color temperature levels of the A screen and three sets of color temperature levels of the B screen into the memory, such as writing into the nonvolatile memory.

In this step, each time the mobile terminal sets the brightness level of the backlight, the calibration color temperature level of the A screen and the calibration color temperature level of the B screen are determined according to the brightness level of the backlight, and the determined color temperature level of the A screen is written into the color temperature of the A screen. In the register, the determined calibration color temperature level of the B screen is written into the color temperature register of the B screen. When displaying, the RGB actual scale value of the display screen of the A screen is calculated according to the RGB scale value of the display screen of the A screen and the color temperature level of the default color temperature register of the A screen, and is displayed based on the actual RGB ratio value of the display screen of the A screen. The RGB actual scale value of the display screen of the B screen is calculated according to the RGB scale value of the display screen of the B screen and the color temperature level of the default color temperature register of the B screen, and is displayed based on the actual RGB ratio value of the display screen of the B screen.

Embodiment 3

Referring to FIG. 8, the present application proposes a color coordinate calibration apparatus, including:

The control module 810 is configured to display a display screen of the color to be calibrated of the default color temperature level and the preset brightness level of the display screen of the control terminal;

The obtaining module 820 is configured to obtain color coordinates of the color to be calibrated displayed on the display screen of the terminal on the chromaticity diagram;

The calibration module 830 is configured to determine a calibration color temperature level corresponding to the at least one brightness level of the display screen, in response to the determination result that the color coordinate of the to-be-calibrated color on the chromaticity diagram meets the calibration condition displayed by the display screen, And transmitting a calibration color temperature level corresponding to the at least one brightness level to the terminal.

In an embodiment, the calibration module 830 is set to one of the following:

In the case that the terminal includes one of the display screens, the color coordinates of the color to be calibrated displayed on the chromaticity diagram are compared with the target color coordinate area, based on the display screen If the color coordinate of the color to be calibrated is not in the target color coordinate region, it is determined that the color coordinate satisfies a calibration condition, and the color to be calibrated displayed on the display screen is in a chromaticity diagram. Calibrating the upper color coordinate; wherein the target color coordinate region is an area including a target color coordinate value, and all color coordinate values having a distance from the target color coordinate value that is less than or equal to a first preset threshold;

In the case that the terminal includes two of the display screens, the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens are compared on the chromaticity diagram, based on the two color coordinates. If the distance is greater than the second preset threshold, it is determined that the two color coordinates satisfy the calibration condition, and the color coordinates of the to-be-calibrated color respectively displayed on the two display screens are calibrated on the chromaticity diagram;

Comparing the color coordinates of the color to be calibrated displayed on all the display screens on the chromaticity diagram in the case that the terminal includes three or more than three display screens, based on the three or more If any two of the display screens in the display screen have a distance in which the color coordinate of the color to be calibrated is greater than a third preset threshold, it is determined that the color coordinate satisfies a calibration condition, and any two of the two are described. The color to be calibrated displayed on the display screen is calibrated on the color coordinates on the chromaticity diagram.

In an embodiment, the calibration module 830 is configured to:

Obtaining color coordinates corresponding to part or all of the color temperature levels corresponding to at least one brightness level of the display screen;

For each of the preset brightness levels, determining a calibration color temperature level according to color coordinates corresponding to each of the partial or all color temperature levels;

Wherein the calibration color temperature level comprises one of the following:

In the case where N is 1, the color temperature level of the color coordinate having the smallest distance from the target color coordinate value;

In the case where N is greater than or equal to 2, the color temperature levels of the N display screens having the smallest color coordinate distance; wherein N is the number of the display screens.

In an embodiment, the calibration module 830 is further configured to:

Adjusting a ratio value of the at least one primary color light level corresponding to the lowest color temperature level and/or the highest color temperature level of the at least one of the display screens, and corresponding to the adjusted minimum color temperature level and/or the highest color temperature level of the at least one of the display screens A proportional value of at least one primary color light is transmitted to the terminal.

Embodiment 4

As shown in FIG. 9, the present disclosure provides a color coordinate calibration method, including steps 910 to 930.

Step 910: Receive an instruction, and display, according to the instruction, a display screen of a color to be calibrated of a default color temperature level and a preset brightness level on a display screen;

Step 920: Receive and store at least one calibration color temperature level corresponding to the brightness level, and write a calibration color temperature level corresponding to the brightness level of the backlight of the display screen into the color temperature register;

Step 930: Display the calibrated screen based on the calibration color temperature level in the color temperature register.

In an embodiment, the method further includes:

Receiving at least one of the following at least one of the display screens:

a ratio value of the at least one primary color light corresponding to the adjusted minimum color temperature level; and a ratio value of the at least one primary color light corresponding to the adjusted highest color temperature level.

Embodiment 5

As shown in FIG. 10, the present application proposes an apparatus including a processor 1010 and a computer readable storage medium 1020 having instructions stored therein, when the instructions are executed by the processor 1010, implementing the above The method of any of the embodiments.

The present application proposes a computer readable storage medium having stored thereon a computer program that, when executed by a processor, implements the method described in any of the above embodiments.

Embodiment 6

Referring to FIG. 11, the present application proposes a color coordinate calibration system, including: a server 1110 and a terminal 1120; the server 1110 is configured to execute the method described in any of the embodiments on the server side; the terminal 1120 is configured to execute the application in the terminal. The method of any of the embodiments of the side.

Example 7

In one embodiment, the present application provides a color coordinate calibration system comprising:

The color coordinate calibration device is configured to display a display screen of the color to be calibrated of the default color temperature level and the preset brightness level on the display screen of the control terminal; and obtain the color coordinates of the color to be calibrated displayed on the chromaticity diagram displayed on the display screen of the terminal; Determining, according to the calibration condition, that the color coordinate of the color to be calibrated on the chromaticity diagram satisfies a calibration condition, determining a calibration color temperature level corresponding to at least one brightness level of the display screen, and calibrating a color temperature corresponding to the at least one brightness level Levels are sent to the terminal;

The terminal is configured to display a display screen of the color to be calibrated of the default color temperature level and the preset brightness level on the display screen under the control of the color coordinate calibration device; receive the calibration color temperature level corresponding to the at least one brightness level, and save at least one brightness level Corresponding calibration color temperature level; write the calibration color temperature level corresponding to the brightness level of the backlight of the display to the color temperature register.

In an embodiment, the color coordinate calibration device is set to one of the following:

When the terminal includes a display screen, comparing the color coordinates of the color to be calibrated displayed on the chromaticity diagram with the target color coordinate area, when the color coordinate is not in the target color coordinate area When the color coordinate is determined to meet the calibration condition, wherein the target color coordinate region is a target color coordinate value, and the distance from the target color coordinate value is less than or equal to the first preset threshold. Area;

Or, when the terminal includes two display screens, compare the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens on the chromaticity diagram, when the distance between the two color coordinates is greater than the second pre- When the threshold is set, it is determined that the two color coordinates satisfy the calibration condition;

Or, when the terminal includes three or more than three display screens, compare the color coordinates of the to-be-calibrated colors displayed on each of the display screens on the chromaticity diagram, when the above three or more display screens are used When the distance between the color coordinates of the color to be calibrated displayed by any two of the display screens is greater than a third preset threshold, it is determined that the color coordinates described above satisfy the calibration condition.

For example, for the terminals of three display screens (A screen, B screen and C screen respectively), calculate the distance of three sets of color coordinates, that is: under the preset brightness level, all the displays display the default color temperature level to be calibrated. Color picture.

The distance between the color coordinates of the A screen and the color coordinates of the B screen is denoted as S ₁ ;

The distance between the color coordinates of the A screen and the color coordinates of the C screen is denoted as S ₂ ;

The distance between the color coordinates of the B screen and the color coordinates of the C screen is denoted as S ₃ ;

Then, when S ₁ , S ₂ and S ₃ are both less than or equal to the third preset threshold, it is determined that the color coordinates described above need not be calibrated (ie, the calibration condition is not satisfied), when S ₁ , S ₂ or S ₃ When it is greater than the third preset threshold, it is determined that the color coordinates described above are to be calibrated (ie, the calibration condition is satisfied).

In an embodiment, the color coordinate calibration device is configured to:

Obtaining color coordinates corresponding to part or all of the color temperature levels corresponding to at least one brightness level of the display screen;

For each of the preset brightness levels, determining a calibration color temperature level according to color coordinates corresponding to each of the partial or all color temperature levels;

Wherein, the calibration color temperature level is any one of the following:

When N is 1, the color temperature level of the color coordinate having the smallest distance from the target color coordinate value;

When N is greater than or equal to 2, the color temperature level of the N display screens having the smallest color coordinate distance; wherein N is the number of the display screens.

In an embodiment, the color coordinate calibration device is further configured to:

Adjusting a ratio value of the at least one primary color light level corresponding to the lowest color temperature level and/or the highest color temperature level of the at least one of the display screens, and corresponding to the adjusted minimum color temperature level and/or the highest color temperature level of the at least one of the display screens Transmitting a ratio value of at least one primary color light to the terminal;

The terminal is also set to:

Receiving, by the adjusted minimum value temperature level of the at least one of the display screens and/or a ratio value of the at least one primary color light corresponding to the highest color temperature level, at least one of the adjusted minimum color temperature levels of the at least one of the display screens The proportional value of the primary color light is set to the lowest color temperature register of the corresponding display screen, and the adjusted ratio value of the at least one primary color light corresponding to the highest color temperature level of the at least one of the display screens is set to the highest color temperature register of the corresponding display screen.

The disclosure realizes the calibration of the color coordinates of the color to be calibrated displayed on the chromaticity diagram by adjusting the calibration color temperature level corresponding to at least one brightness level of the display screen, reduces the unevenness of the color tone of the display screen, and reduces the terminal. The difference in hue between the different display screens improves the consistency of the display on the display of the terminal.

Claims (12)

1. A color coordinate calibration method comprising:

   The display screen of the control terminal displays a display screen of the color to be calibrated of the default color temperature level and the preset brightness level;

   Obtaining a color coordinate of the color to be calibrated displayed on a display screen of the terminal on a chromaticity diagram;

   Determining, according to a determination result that the color coordinate of the color to be calibrated on the chromaticity diagram meets the calibration condition, the calibration color temperature level corresponding to the at least one brightness level of the display screen, the at least one brightness The calibration color temperature level corresponding to the level is sent to the terminal.
2. The method of claim 1 wherein said satisfying calibration condition comprises one of:

   In the case that the terminal includes one of the display screens, the color coordinates of the color to be calibrated displayed on the display screen are compared with the target color coordinate area, and the display screen displays The color coordinates of the calibration color on the chromaticity diagram are not in the target color coordinate region; wherein the target color coordinate region is included in the target color coordinate value, and the distance from the target color coordinate value is less than or equal to the first An area of all color coordinate values of a predetermined threshold;

   In the case that the terminal includes two of the display screens, the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens are compared on the chromaticity diagram, and the distance between the two color coordinates is Greater than a second preset threshold;

   In the case that the terminal includes more than three of the display screens, compare the color coordinates of the to-be-calibrated colors displayed on all the display screens on the chromaticity diagram, the three or more of the display screens The distance of the color coordinates of the color to be calibrated displayed by any two of the display screens is greater than a third preset threshold.
3. The method of claim 1 wherein said determining a calibration color temperature level corresponding to at least one brightness level of the display screen comprises:

   Obtaining color coordinates corresponding to part or all of the color temperature levels corresponding to at least one brightness level of the display screen;

   For each of the preset brightness levels, determining a calibration color temperature level according to color coordinates corresponding to each of the partial or all color temperature levels;

   Wherein the calibration color temperature level comprises one of the following:

   In the case where N is 1, the color temperature level of the color coordinate having the smallest distance from the target color coordinate value;

   In the case where N is greater than or equal to 2, the color temperature levels of the N display screens having the smallest color coordinate distance; wherein N is the number of the display screens.
4. The method according to claim 3, before the determining the calibration color temperature level corresponding to each preset brightness level, further comprising:

   Adjusting at least one of the at least one of the display screens: a ratio value of the at least one primary color light corresponding to the lowest color temperature level; and a ratio value of the at least one primary color light corresponding to the highest color temperature level;

   The adjustment result is sent to the terminal.
5. A color coordinate calibration method comprising:

   Receiving an instruction to display a display screen of a color to be calibrated of a default color temperature level and a preset brightness level on the display screen based on the instruction;

   Receiving and storing at least one calibration color temperature level corresponding to the brightness level, and writing a calibration color temperature level corresponding to the brightness level of the backlight of the display screen into the color temperature register;

   The calibrated screen is displayed based on the calibration color temperature level in the color temperature register.
6. The method of claim 5 further comprising:

   Receiving at least one of the following at least one of the display screens:

   a ratio value of the at least one primary color light corresponding to the adjusted minimum color temperature level; and a ratio value of the at least one primary color light corresponding to the adjusted highest color temperature level.
7. A color coordinate calibration device comprising:

   a control module, configured to display a display screen of the color to be calibrated of the default color temperature level and the preset brightness level on the display screen of the control terminal;

   Obtaining a module, configured to obtain color coordinates of the color to be calibrated displayed on a display screen of the terminal on a chromaticity diagram;

   a calibration module, configured to determine a calibration color temperature level corresponding to at least one brightness level of the display screen in response to a determination result that the color coordinate of the color to be calibrated displayed on the chromaticity diagram meets a calibration condition The calibration color temperature level corresponding to the at least one brightness level is sent to the terminal.
8. The apparatus of claim 7, wherein the calibration module is set to one of the following:

   In the case that the terminal includes one of the display screens, the color coordinates of the color to be calibrated displayed on the chromaticity diagram are compared with the target color coordinate area, based on the display screen And determining, in the case that the color coordinate of the color to be calibrated is not in the target color coordinate region, that the color coordinate satisfies a calibration condition; wherein the target color coordinate region is a target color coordinate value, and An area of the target color coordinate value whose distance is less than or equal to all the color coordinate values of the first preset threshold;

   In the case that the terminal includes two of the display screens, the color coordinates of the to-be-calibrated colors respectively displayed on the two display screens are compared on the chromaticity diagram, based on the two color coordinates. If the distance is greater than the second preset threshold, it is determined that the two color coordinates satisfy the calibration condition;

   In the case that the terminal includes more than three of the display screens, the color coordinates of the color to be calibrated displayed on all the display screens are compared on the chromaticity diagram, based on the three or more displays. If the distance of the color coordinates of the to-be-calibrated color on the chromaticity diagram displayed on any two of the screens in the screen is greater than a third preset threshold, it is determined that the color coordinates satisfy the calibration condition.
9. The apparatus of claim 7 wherein said calibration module is configured to:

   Obtaining color coordinates corresponding to part or all of the color temperature levels corresponding to at least one brightness level of the display screen;

   For each of the preset brightness levels, determining a calibration color temperature level according to color coordinates corresponding to each of the partial or all color temperature levels;

   Wherein the calibration color temperature level comprises one of the following:

   In the case where N is 1, the color temperature level of the color coordinate having the smallest distance from the target color coordinate value;

   In the case where N is greater than or equal to 2, the color temperature levels of the N display screens having the smallest color coordinate distance; wherein N is the number of the display screens.
10. The apparatus of claim 9 wherein said calibration module is further configured to:

    Adjusting at least one of the at least one of the display screens: a ratio value of the at least one primary color light corresponding to the lowest color temperature level; and a ratio value of the at least one primary color light corresponding to the highest color temperature level;

    The adjustment result is sent to the terminal.
11. An apparatus comprising a processor and a computer readable storage medium having instructions stored therein, wherein the instructions are executed by the processor, implementing the claims 1 to 4 or the claims The method according to any one of 5-6.
12. A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the method of any one of claims 1 to 4 or 5 to 6.

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