TW202422531A - Brightness correction method and display device - Google Patents

Abstract

The disclosure provides a brightness correction method and a display device. The method includes: performing a first color correction on a specific chromaticity coordinate of the display device to obtain a plurality of first gamma parameters corresponding to a plurality of color channels; obtaining a first luminance loss of the display device after experiencing the first color correction; in response to determining that the first luminance loss is higher than a loss threshold, performing a second color correction on the specific chromaticity coordinate which has experienced the first color correction to obtain a plurality of second gamma parameters corresponding to the color channels; obtaining a second luminance loss of the display device after experiencing the second color correction; and in response to determining that the second luminance loss is not higher than the loss threshold, selecting the second gamma parameter to perform color correction of the display device.

Description

Brightness correction method and display device

The present invention relates to a display technology, and in particular to a brightness correction method and a display device.

Due to differences in manufacturers and materials used, different display panels have certain differences. Therefore, the color tones displayed by different panels may not be the same, and thus the color cannot be well presented.

In order to adjust the color to the target color standard, there is a known technology that uses programming to allow the computer to output test patterns to the display and control the color analyzer to measure the test patterns. According to the deviation between the measured data and the target value, the computer can calculate and automatically adjust the gamma parameters repeatedly until the measured data approaches the target value or falls within the allowable error range, and finally a set of calibrated gamma parameters can be obtained.

It is known that there are two adjustment strategies with different functional orientations: maintaining color accuracy or maintaining panel brightness. However, the existing color calibration method will lead to color inaccuracy or insufficient brightness, and is not suitable for the calibration of display panels of certain brands of notebook computers. In order to allow professional creators or designers to have the best user experience, each display panel needs to be calibrated during the production process to ensure that the display can accurately restore colors and have a certain panel brightness.

In view of this, the present invention provides a brightness correction method and a display device, which can be used to solve the above technical problems.

The embodiment of the present invention provides a brightness correction method suitable for a display device, comprising: performing a first color correction on a specific chromaticity coordinate of the display device to obtain a plurality of first gamma parameters corresponding to a plurality of color channels, wherein the difference between the specific chromaticity coordinate subjected to the first color correction and a target chromaticity coordinate meets a preset condition; obtaining a first brightness loss of the display device after the first color correction; in response to determining that the first brightness loss is higher than a loss threshold, performing a second color correction on the specific chromaticity coordinate subjected to the first color correction to obtain a plurality of second gamma parameters corresponding to the plurality of color channels; obtaining a second brightness loss of the display device after the second color correction; and in response to determining that the second brightness loss is not higher than the loss threshold, selecting the plurality of second gamma parameters to perform a color correction of the display device.

The embodiment of the present invention provides a display device, including a storage circuit and a processor. The storage circuit stores a program code. The processor is coupled to the storage circuit and accesses the program code to execute: performing a first color correction on a specific chromaticity coordinate of the display device to obtain a plurality of first gamma parameters corresponding to a plurality of color channels, wherein the difference between the specific chromaticity coordinate subjected to the first color correction and a target chromaticity coordinate meets a preset condition; obtaining a first brightness loss of the display device after the first color correction; in response to determining that the first brightness loss is higher than a loss threshold, performing a second color correction on the specific chromaticity coordinate subjected to the first color correction to obtain a plurality of second gamma parameters corresponding to the plurality of color channels; obtaining a second brightness loss of the display device after the second color correction; in response to determining that the second brightness loss is not higher than the loss threshold, selecting the plurality of second gamma parameters to perform a color correction of the display device.

Please refer to FIG. 1, which is a schematic diagram of a display device according to an embodiment of the present invention. In different embodiments, the display device 100 can be various smart devices and/or computer devices (such as laptop computers) with displays. In some embodiments, the display device 100 can also be an independent display externally connected to other electronic devices (such as computers), but is not limited thereto.

In FIG1 , the display device 100 includes a storage circuit 102 and a processor 104. The storage circuit 102 is, for example, any type of fixed or removable random access memory (RAM), read-only memory (ROM), flash memory, hard disk or other similar devices or a combination of these devices, and can be used to record multiple program codes or modules.

The processor 104 is coupled to the storage circuit 102 and may be a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor, a plurality of microprocessors, one or more microprocessors combined with a digital signal processor core, a controller, a microcontroller, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), any other type of integrated circuit, a state machine, an Advanced RISC Machine (ARM) based processor, and the like.

In an embodiment of the present invention, the processor 104 can access the modules and program codes recorded in the storage circuit 102 to implement the brightness correction method proposed by the present invention, the details of which are described as follows.

Please refer to FIG2, which is a flow chart of a brightness calibration method according to an embodiment of the present invention. The method of this embodiment can be executed by the display device 100 of FIG1. The following is a description of the details of each step of FIG2 with reference to the components shown in FIG1.

First, in step S210, the processor 104 performs a first color correction on specific chromaticity coordinates of the display device 100 to obtain a plurality of first gamma parameters corresponding to a plurality of color channels, wherein the difference between the specific chromaticity coordinates subjected to the first color correction and the target chromaticity coordinates meets a preset condition.

In the embodiment of the present invention, the above-mentioned specific chromaticity coordinates are, for example, chromaticity coordinates corresponding to the highest brightness level. For example, assuming that the display device 100 has 256 gray levels from 0 to 255, the above-mentioned specific chromaticity coordinates are, for example, chromaticity coordinates corresponding to gray level 255, and the chromaticity coordinates can be represented as In other embodiments, if the display device 100 has more/fewer gray levels, the corresponding specific chromaticity coordinates can be expressed in a corresponding manner. In other embodiments, the processor 104 can also select chromaticity coordinates corresponding to other brightness levels as the above-mentioned specific chromaticity coordinates according to the needs of the designer. For the convenience of explanation, the following uses to generally characterize the above specific chromaticity coordinates, and Characterizes the target chromaticity coordinates, but is not limited to this.

In one embodiment, the color channels include, for example, a first color channel, a second color channel, and a third color channel. In the embodiment of the present invention, the first color channel, the second color channel, and the third color channel are, for example, a blue color channel (hereinafter referred to as a B channel), a green color channel (hereinafter referred to as a G channel), and a red color channel (hereinafter referred to as an R channel), respectively, but are not limited thereto.

In some embodiments, when performing the first color correction, the processor 104 may, for example, sequentially perform the following operations: (a1) responding to the determination Less than or Less than , judge and is greater than or equal to a first threshold, and and is greater than or equal to a second threshold; (a2) reflects the judgment and The absolute value of the first difference between is greater than or equal to the first threshold, and and When the absolute value of the second difference between the two is greater than or equal to the second threshold, the gamma parameter corresponding to the first color channel is adjusted repeatedly until No less than and No less than , and The absolute value of the first difference between is not less than the first threshold, or and The absolute value of the second difference between the two is not less than the second threshold; (a3) reflects the judgment and The first difference between the two is not less than the first threshold, repeatedly adjusting the gamma parameter corresponding to the second color channel until the first difference is less than the first threshold; (a4) responding to the determination and The gamma parameter corresponding to the third color channel is repeatedly adjusted until the second difference is less than the second threshold; and (a5) the gamma parameter corresponding to the first color channel, the gamma parameter corresponding to the second color channel, and the gamma parameter corresponding to the third color channel are used as the plurality of first gamma parameters. In one embodiment, the above operation can be implemented according to the content of FIG. 3.

Please refer to FIG. 3, which is a flowchart of performing the first color calibration according to an embodiment of the present invention. In step S311, the processor 104 may obtain In step S312, the processor 104 may determine Is it greater than or equal to as well as Is it greater than or equal to If not (i.e., Less than or Less than ), the processor 104 may continue to execute step S313; if so, the processor 104 may continue to execute step S315.

In step S313, the processor 104 determines and The first difference between Indicates that ) (i.e., ) is greater than or equal to a first threshold, and and The one-second difference between Indicates that ) (i.e., ) is greater than or equal to a second threshold. In FIG. 3 , the first threshold and the second threshold can both be assumed to be 0.1%, but are not limited thereto. In other embodiments, the designer can select the required first threshold and the second threshold according to the requirements.

In one embodiment, the response is to determine Greater than or equal to the first threshold (i.e., Too much deviation from ),and Greater than or equal to the second threshold (i.e., Too much deviation from ), the processor 104 may execute step S314 after step S313 to adjust the gamma parameters corresponding to the B channel.

On the other hand, the response to judgment Less than or equal to the first threshold (i.e., Close to ),or Less than or equal to the second threshold (i.e., Close to ), the processor 104 may continue to execute step S315 after step S313.

Generally speaking, gamma parameters generally include gamma offset and gamma gain, and the various gamma parameters mentioned in the embodiments of the present invention are all referred to as gamma gain, but are not limited thereto.

In one embodiment, the processor 104 may adjust the gamma gain of the B channel in step S314, for example, because this may affect both and , but is not limited to this.

In one embodiment, the processor 104 adjusts the gamma gain of the B channel by, for example, ,in That is, the processor 104 may reduce the gamma gain of the B channel in step S314. , but is not limited to this.

After step S314, the processor 104 may return to execute step S311. In the embodiment of the present invention, the processor 104 may repeatedly execute steps S311-S314 until No less than and No less than (i.e., the determination in step S312 is "yes"), is not less than the first threshold, or is not less than the second threshold (i.e., the determination in step S313 is “No”).

In step S315, the processor 104 determines If so, the processor 104 may continue to execute step S316 to adjust the gamma parameter corresponding to the G channel; if not, the processor 104 may continue to execute step S317.

In one embodiment, the processor 104 may adjust the gamma gain of the G channel in step S316, for example, because this may only affect , but is not limited to this.

In one embodiment, the processor 104 adjusts the magnitude of the gamma gain of the G channel by, for example, ,in That is, the processor 104 may reduce the gamma gain of the G channel in step S316. , but is not limited to this.

After step S316, the processor 104 may return to execute step S311. In this case, the processor 104 may repeatedly execute steps S311, S312, S315, and S316 until is less than the first threshold (i.e., the determination in step S315 is “No”).

In step S317, the processor 104 determines If so, the processor 104 may continue to execute step S318 to adjust the gamma parameter corresponding to the R channel; if not, the processor 104 may continue to execute step S319.

In one embodiment, the processor 104 may adjust the gamma gain of the R channel in step S318, for example, because this may only affect , but is not limited to this.

In one embodiment, the processor 104 adjusts the magnitude of the gamma gain of the R channel by, for example, ,in That is, the processor 104 may reduce the gamma gain of the R channel in step S318. , but is not limited to this.

After step S318, the processor 104 may return to execute step S311. In this case, the processor 104 may repeatedly execute steps S311, S312, S315, S317, and S318 until is less than the second threshold (i.e., the determination in step S317 is “No”).

In step S319, the processor 104 uses the gamma parameter corresponding to the B channel (ie, the first color channel), the gamma parameter corresponding to the G channel (ie, the second color channel), and the gamma parameter corresponding to the R channel (ie, the third color channel) as the plurality of first gamma parameters.

In an embodiment of the present invention, when Less than the second threshold and When the difference between the specific chromaticity coordinates and the target chromaticity coordinates is less than the first threshold (i.e., the determination in step S317 is "No"), it can be determined that the difference between the specific chromaticity coordinates and the target chromaticity coordinates meets the preset condition. Not less than the second threshold or is not less than the first threshold, it can be determined that the difference between the specific chromaticity coordinates and the target chromaticity coordinates does not meet the preset conditions, but is not limited to this.

In one embodiment, the operation in FIG. 3 may have a negative impact on the color brightness of the plurality of color channels, resulting in a reduction in the display panel brightness of the display device 100. Based on this, the present invention can further perform color compensation and improve the panel brightness through subsequent steps, while avoiding the problem of color oversaturation.

Please refer to FIG. 2 again. After obtaining the plurality of first gamma parameters (e.g., the gamma gain of the B channel, the gamma gain of the G channel, and the gamma gain of the R channel obtained in the manner shown in FIG. 3 ) through step S210, the processor 104 continues to execute step S220 to obtain the first brightness loss of the display device 100 after the first color correction.

In one embodiment, the processor 104 obtains the first maximum brightness of the display device 100 before the first color correction. For example, the processor 104 may obtain the maximum brightness of the display device 100 as the first maximum brightness before executing step S311 in FIG. 3 . In one embodiment, the processor 104 may control the display panel of the display device 100 to display a specific pattern (e.g., a pure white pattern) and measure the corresponding brightness (in nits) as the first maximum brightness, but is not limited thereto.

Afterwards, the processor 104 may obtain the second maximum brightness of the display device 100 after the first color correction. For example, after performing the first color correction, the processor 104 may again control the display panel of the display device 100 to display a specific pattern (e.g., a pure white pattern), and measure the corresponding brightness as the second maximum brightness, but is not limited thereto. Then, the processor 104 subtracts the second maximum brightness from the first maximum brightness to estimate the first brightness loss.

In one embodiment, the first brightness loss may be understood as a decrease in brightness of the display device 100 after the first color correction, but is not limited thereto.

In step S230, in response to determining that the first luminance loss is greater than a loss threshold (e.g., 10% or other values selected by the designer), the processor 104 performs a second color correction on the specific chromaticity coordinates that have undergone the first color correction to obtain a plurality of second gamma parameters corresponding to the plurality of color channels.

In some embodiments, when performing the second color correction, the processor 104 may, for example, sequentially perform the following operations: (b1) increasing the gamma parameter corresponding to the first color channel and obtaining ; (b2) Respond to the judgment and The absolute value of a first difference between the two is not less than a first threshold, and the gamma parameter corresponding to the second color channel is repeatedly adjusted according to the positive or negative sign of the first difference until and The absolute value of the first difference between is less than the first threshold; (b3) reflects the judgment and The absolute value of a second difference between the two is not less than a second threshold, and the gamma parameter corresponding to the third color channel is repeatedly adjusted according to the positive or negative sign of the second difference until and (b4) in response to determining that the sum of the absolute value of the first difference and the absolute value of the second difference is not greater than a third threshold, the gamma parameter corresponding to the first color channel, the gamma parameter corresponding to the second color channel, and the gamma parameter corresponding to the third color channel are used as the plurality of second gamma parameters. In one embodiment, the above operation can be implemented according to the content of FIG. 4.

Please refer to FIG. 4, which is a flow chart of performing the second color correction according to an embodiment of the present invention. In step S411, the processor 104 increases the gamma parameter corresponding to the B channel to simultaneously affect In step S412, the processor 104 obtains .

In step S413, the processor 104 determines If yes, the processor 104 may continue to execute step S414; if no, the processor 104 may continue to execute step S417.

In step S414, the processor 104 determines Is it greater than 0 (i.e., If yes, the processor 104 continues to execute step S415 to reduce the gamma parameter corresponding to the G channel; if no, the processor 104 continues to execute step S416 to increase the gamma parameter corresponding to the G channel.

In one embodiment, the processor 104 may, for example, reduce the gamma gain of the G channel in step S415. In addition, the processor 104 may, for example, increase the gamma gain of the G channel in step S416. In one embodiment, the magnitude by which the processor 104 increases/decreases the gamma gain of the G channel is, for example, ,in That is, the processor 104 may reduce the gamma gain of the G channel in step S415. , or in step S416, the gamma gain of the G channel is increased by , but is not limited to this.

After executing step S415 or S416, the processor 104 may return to step S412. In this case, the processor 104 may repeatedly execute steps S412, S413, S414, S415 (or S416) until is less than the first threshold (i.e., the determination in step S413 is “No”).

In step S417, the processor 104 determines If yes, the processor 104 may continue to execute step S418; if no, the processor 104 may continue to execute step S421.

In step S418, the processor 104 determines Is it greater than 0 (i.e., If yes, the processor 104 continues to execute step S419 to reduce the gamma parameter corresponding to the R channel; if no, the processor 104 continues to execute step S420 to increase the gamma parameter corresponding to the R channel.

In one embodiment, the processor 104 may, for example, reduce the gamma gain of the R channel in step S419. In addition, the processor 104 may, for example, increase the gamma gain of the R channel in step S420. In one embodiment, the magnitude by which the processor 104 increases/decreases the gamma gain of the R channel is, for example, ,in That is, the processor 104 may reduce the gamma gain of the R channel in step S419. , or in step S420, the gamma gain of the R channel is increased by , but is not limited to this.

After executing step S419 or S420, the processor 104 may return to step S412. In this case, the processor 104 may repeatedly execute steps S412, S417, S418, S419 (or S420) until is less than the second threshold (i.e., the determination in step S417 is “No”).

In step S421, the processor 104 may determine and Is the sum of not greater than the third threshold?

In FIG. 4 , the third threshold is, for example, 0.6%, but is not limited thereto. In this embodiment, step S421 can also be understood as determining and Whether the average value of is no greater than half of the third threshold value (ie, 0.3%), but is not limited to this.

In FIG. 4 , since one may attempt to increase the gamma parameters (e.g., gamma gain) of the B channel, G channel, and/or R channel, it may appear that the gamma gain of the B channel, G channel, and/or R channel is greater than 1. However, for the highest level (e.g., 255), saturation must occur when the gamma gain is greater than 1.

Therefore, the highest brightness level must be tested in step S421 to confirm its chromaticity coordinates. and Is the deviation within the allowable error range (e.g. 0.3%) to avoid over-saturation of color?

In step S421, if and The sum of is no greater than the third threshold, which means Close to Therefore, the color oversaturation phenomenon will not occur. Based on this, the processor 104 can continue to execute step S422.

In step S422, the processor 104 uses the gamma parameter corresponding to the B channel (i.e., the first color channel), the gamma parameter corresponding to the G channel (i.e., the second color channel), and the gamma parameter corresponding to the R channel (i.e., the third color channel) as the plurality of second gamma parameters. Thereafter, the processor 104 may continue to execute step S240.

On the other hand, if and is greater than the third threshold, which means that the mechanism of FIG. 4 may cause the problem of color oversaturation. Therefore, the processor 104 may continue to execute step S270 after step S421 to select the plurality of first gamma parameters (i.e., the gamma parameters of each color channel obtained by performing the first color correction) to perform color correction of the display device 100. That is, the processor 104 may not use the gamma parameters of each color channel obtained by performing the second color correction for subsequent color correction.

Please refer to FIG. 2 again. In step S240, the processor 104 obtains the second brightness loss of the display device 100 after the second color calibration.

In one embodiment, the processor 104 may obtain the third maximum brightness of the display device 100 after the second color correction. For example, after performing the second color correction, the processor 104 may control the display panel of the display device 100 to display a specific pattern (e.g., a pure white pattern) again, and measure the corresponding brightness as the third maximum brightness, but is not limited thereto. Then, the processor 104 subtracts the third maximum brightness from the first maximum brightness to estimate the second brightness loss.

In the embodiment of the present invention, the operation in the second color correction can be understood as compensating the brightness of the display device 100 to a certain extent. Based on this, the second brightness loss can be understood as the brightness reduction degree of the display device 100 after the first color correction and the second color correction, but it is not limited thereto.

Next, in step S250, the processor 104 determines whether the second brightness loss is not higher than the loss threshold (e.g., 10%). If so, it means that the brightness of the display device 100 has been successfully restored/compensated to a certain extent through the second color correction. In other words, the plurality of second gamma parameters obtained by the second color correction can allow the display device 100 to have good color performance while reducing the brightness drop.

Based on this, the processor 104 may continue to execute step S260 to select the plurality of second gamma parameters to perform color correction of the display device. That is, the processor 104 may use the plurality of second gamma parameters to perform corresponding color correction on the subsequently displayed images/contents in the future, but is not limited thereto.

On the other hand, if the second brightness loss is still higher than the loss threshold, it means that it may not be possible to achieve the effect of color correction and avoiding brightness reduction at the same time. Therefore, the processor 104 may execute step S270 to select the plurality of first gamma parameters (i.e., the gamma parameters of each color channel obtained by executing the first color correction) to perform color correction of the display device 100. That is, the processor 104 will use the plurality of first gamma parameters to perform corresponding color correction on the subsequently displayed image/content in the future, but is not limited thereto.

In summary, the method proposed in the embodiment of the present invention can try to find another set of gamma parameters that can avoid excessive brightness reduction while maintaining color performance through the second color correction when it is determined that the brightness of the display device has dropped too much due to the first color correction. In this way, the display device can provide a better image effect and visual experience.

Although the present invention has been disclosed as above by the embodiments, they are not intended to limit the present invention. Any person with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the scope of the attached patent application.

100: Display device 102: Storage circuit 104: Processor S210~S270, S311~S319, S411~S422: Steps

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a flow chart of a brightness correction method according to an embodiment of the present invention. FIG. 3 is a flow chart of performing a first color correction according to an embodiment of the present invention. FIG. 4 is a flow chart of performing a second color correction according to an embodiment of the present invention.

S210~S270: Steps

Claims (10)

A brightness correction method, suitable for a display device, includes: Performing a first color correction on a specific chromaticity coordinate of the display device to obtain a plurality of first gamma parameters corresponding to a plurality of color channels, wherein the difference between the specific chromaticity coordinate subjected to the first color correction and a target chromaticity coordinate meets a preset condition; Obtaining a first brightness loss of the display device after the first color correction; In response to determining that the first brightness loss is higher than a loss threshold, performing a second color correction on the specific chromaticity coordinate subjected to the first color correction to obtain a plurality of second gamma parameters corresponding to the color channels; Obtaining a second brightness loss of the display device after the second color correction; and In response to determining that the second brightness loss is not higher than the loss threshold, the second gamma parameters are selected to perform a color correction of the display device. The method as described in claim 1 further includes: In response to determining that the second brightness loss is higher than the loss threshold, selecting the first gamma parameters to perform the color correction of the display device. A method as described in claim 1, wherein the specific chromaticity coordinate is a chromaticity coordinate corresponding to a highest brightness level. The method as claimed in claim 1, wherein the color channels include a first color channel, a second color channel and a third color channel, and the specific chromaticity coordinates are represented by , the target chromaticity coordinates are characterized by , and the step of performing the first color correction on the specific chromaticity coordinates of the display device to obtain the first gamma parameters corresponding to the color channels includes: Less than or Less than , judge and is greater than or equal to a first threshold, and and is greater than or equal to a second threshold; and The absolute value of the first difference between and When the absolute value of the second difference between the two is greater than or equal to the second threshold, the gamma parameter corresponding to the first color channel is repeatedly adjusted until No less than and No less than , and The absolute value of the first difference between is not less than the first threshold, or and The absolute value of the second difference between is not less than the second threshold; and The first difference between the two is not less than the first threshold, repeatedly adjusting the gamma parameter corresponding to the second color channel until the first difference is less than the first threshold; responding to the determination and The second difference between the two is not less than the second threshold, and the gamma parameter corresponding to the third color channel is repeatedly adjusted until the second difference is less than the second threshold; the gamma parameter corresponding to the first color channel, the gamma parameter corresponding to the second color channel, and the gamma parameter corresponding to the third color channel are used as the first gamma parameters. The method as claimed in claim 1, wherein the step of obtaining the first brightness loss of the display device after undergoing the first color correction is: Obtaining a first maximum brightness of the display device before undergoing the first color correction; Obtaining a second maximum brightness of the display device after undergoing the first color correction; and Subtracting the second maximum brightness from the first maximum brightness to estimate the first brightness loss. The method as claimed in claim 1, wherein the color channels include a first color channel, a second color channel and a third color channel, and the specific chromaticity coordinates are represented by , the target chromaticity coordinates are characterized by , and performing the second color correction on the specific chromaticity coordinates that have undergone the first color correction to obtain the second gamma parameters corresponding to the color channels includes: increasing the gamma parameters corresponding to the first color channel, and obtaining ; Respond to judgment and The absolute value of a first difference between the two is not less than a first threshold, and the gamma parameter corresponding to the second color channel is repeatedly adjusted according to the positive and negative signs of the first difference until and The absolute value of the first difference between the two is less than the first threshold. The method of claim 6, wherein the step of performing the second color correction on the specific chromaticity coordinates that have undergone the first color correction to obtain the second gamma parameters corresponding to the color channels further comprises: and The absolute value of a second difference between the two is not less than a second threshold, and the gamma parameter corresponding to the third color channel is repeatedly adjusted according to the positive and negative signs of the second difference until and The absolute value of the second difference between the two is less than the second threshold. As described in claim 7, the step of performing the second color correction on the specific chromaticity coordinates that have undergone the first color correction to obtain the second gamma parameters corresponding to the color channels further includes: In response to determining that the sum of the absolute value of the first difference and the absolute value of the second difference is not greater than a third threshold, the gamma parameter corresponding to the first color channel, the gamma parameter corresponding to the second color channel, and the gamma parameter corresponding to the third color channel are used as the second gamma parameters. As described in claim 1, the step of obtaining the second brightness loss of the display device after the second color correction includes: obtaining a first maximum brightness of the display device before the first color correction; obtaining a third maximum brightness of the display device after the second color correction; and subtracting the third maximum brightness from the first maximum brightness to estimate the second brightness loss. A display device includes: A storage circuit storing a program code; A processor coupled to the storage circuit and accessing the program code to execute: Performing a first color correction on a specific chromaticity coordinate of the display device to obtain a plurality of first gamma parameters corresponding to a plurality of color channels, wherein the difference between the specific chromaticity coordinate subjected to the first color correction and a target chromaticity coordinate meets a preset condition; Obtaining a first brightness loss of the display device after the first color correction; In response to determining that the first brightness loss is higher than a loss threshold, performing a second color correction on the specific chromaticity coordinate subjected to the first color correction to obtain a plurality of second gamma parameters corresponding to the color channels; Obtaining a second brightness loss of the display device after undergoing the second color correction; In response to determining that the second brightness loss is not higher than the loss threshold, selecting the second gamma parameters to perform a color correction of the display device.