Method for maintaining optical quality of display and display thereof

Abstract

A method for maintaining the optical quality of a display and a display wherein the display comprises a backlight unit, a display unit, and a driving unit coupled to the backlight unit and the display unit, and the driving unit executes the method for maintaining the optical quality of the display comprising: providing a preset gamma value of the display; based on a preset gamma value of the display, driving a driving unit to obtain a first display brightness value corresponding to the backlight unit according to the preset gamma value; performing regional dimming of a backlight unit in the display to obtain a second display brightness value of each region in the measured backlight unit; the driving unit receives the second display brightness value and compares the second display brightness value with the first display brightness value to obtain a brightness difference value; and providing the brightness difference value in the backlight unit for brightness compensation, so that the backlight unit has a third display brightness value.

Description

Technical Field

[0001] The present invention relates to a backlight compensation technology, and in particular to a method for maintaining the optical quality of a display and a display thereof. Background Art

[0002] When traditional sub-millimeter LED displays are dimmed locally, the dimming algorithm is mainly focused on power saving, so it can be found that the key optical properties cannot be maintained. For example, the gamma value before and after local dimming may drop from 2.2 to 2.8. Figure 1 As shown, this may reduce the resolution of the image data and distort it, for example, the overall display screen becomes darker and the dark details are distorted. In addition, sub-millimeter light-emitting diodes will use light expansion compensation or image data to directly increase brightness compensation, but both will cause halo to be generated and / or greatly increase, causing the resolution of the image data to be reduced and distorted again. Summary of the invention

[0003] The invention provides a method for maintaining the optical quality of a display without reducing the resolution of image data and maintaining the brightness and optical quality, and a display thereof, which can reduce halo and maintain brightness and gamma value under different brightness areas.

[0004] The display provided by the present invention includes a backlight unit, a display unit, and a driving unit coupled to the backlight unit and the display unit, wherein the driving unit is used to execute a method for maintaining the optical quality of the display including the following operations: providing a preset gamma value of the display; driving the driving unit based on the preset gamma value of the display to obtain a first display brightness value corresponding to the backlight unit according to the preset gamma value; performing regional dimming of the backlight unit in the display to obtain a second display brightness value for each area in the backlight unit; the driving unit receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value; and provides the brightness difference value to perform brightness compensation in the backlight unit so that the backlight unit has a third display brightness value.

[0005] The present invention provides a method for maintaining the optical quality of a display. The display has a driving unit, a display unit and a backlight unit. The method for maintaining the optical quality of the display includes: obtaining a first display brightness value of the backlight unit based on a preset gamma value of the display; providing a preset gamma value of the display; driving the driving unit based on the preset gamma value of the display to obtain a first display brightness value corresponding to the backlight unit according to the preset gamma value; performing regional dimming of the backlight unit in the display to obtain a second display brightness value for each area in the backlight unit; the driving unit receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value; and providing the brightness difference value in the backlight unit for brightness compensation so that the backlight unit has a third display brightness value.

[0006] In an embodiment of the present invention, the method for maintaining the optical quality of a display further comprises: lowering a preset gamma value of the display to a first gamma value.

[0007] In an embodiment of the present invention, the method for maintaining the optical quality of a display further comprises: adjusting the brightness difference based on a gamma difference between the second gamma value after brightness compensation of the backlight unit and a preset gamma value.

[0008] In one embodiment of the present invention, the above-mentioned method of driving the driving unit based on the preset gamma value of the display to obtain the first display brightness value of the corresponding backlight unit according to the preset gamma value includes: taking the difference between the black screen grayscale measurement value and the white screen grayscale measurement value of the backlight unit as the base and taking the preset gamma value as the exponent to obtain the first display brightness value of the backlight unit.

[0009] In one embodiment of the present invention, the above-mentioned execution of regional dimming of the backlight unit in the display includes: obtaining the regional peak brightness value of each area in the backlight unit; obtaining the brightness area of ​​the backlight unit and the corresponding brightness adjustment ratio; and executing the product of the regional peak brightness value of each area and the brightness adjustment ratio to obtain a second display brightness value for each area in the backlight unit.

[0010] The present invention lowers the gamma value of the display before local dimming, compensates for the brightness difference of the backlight unit, and adjusts the brightness adjustment ratio of the backlight unit according to different brightness areas, thereby achieving a backlight compensation method that can be adjusted without reducing the resolution of image data and maintaining brightness and optical quality, and can reduce halo and maintain brightness and gamma value under different brightness areas.

[0011] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a graph of the gamma value of the display;

[0013] Figure 2 A system block diagram of a display provided by an embodiment of the present invention;

[0014] Figure 3 A flow chart of a method for maintaining the optical quality of a display provided by an embodiment of the present invention;

[0015] Figure 4 A flow chart of obtaining a second display brightness value of a backlight unit provided by an embodiment of the present invention;

[0016] Figure 5 A flowchart of performing local dimming of a backlight unit provided by an embodiment of the present invention;

[0017] Figure 6 A schematic diagram of a regional peak brightness value and its product with a brightness adjustment ratio provided by an embodiment of the present invention;

[0018] Figure 7 A flow chart of a method for maintaining the optical quality of a display provided by another embodiment of the present invention;

[0019] Figure 8 A flowchart of a method for maintaining the optical quality of a display provided by yet another embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is particularly described by the following examples, which are only used for illustration, because for those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the present disclosure, so the protection scope of the present disclosure should be determined by the scope of the attached claims. Throughout the specification and the claims, unless the content clearly specifies, the meaning of "a", "an" and "the" includes such a description including "one or at least one" components or ingredients. In addition, as used in the present invention, unless it is obvious from the specific context that the plurality is excluded, the singular article also includes the description of plural components or ingredients. Moreover, when used in this description and the following claims, unless the content clearly specifies, the meaning of "in which" may include "in which" and "on which". The terms used in the specification and the claims generally have the ordinary meaning of each term used in this field, in the content disclosed herein and in the specific content, unless otherwise specified. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide practitioners with additional guidance regarding the description of the present invention. Examples anywhere throughout the specification, including the use of examples of any term discussed herein, are provided for illustrative purposes only and certainly do not limit the scope and meaning of the present invention or any exemplified term. Likewise, the present invention is not limited to the various embodiments set forth in this specification.

[0021] As used herein, the terms "substantially", "around", "about" or "approximately" shall generally mean within 20% of a given value or range, preferably within 10%. In addition, the quantities provided herein may be approximate, thus meaning that the terms "approximately", "about" or "approximately" may be used to represent the same unless otherwise stated. When a quantity, concentration or other numerical value or parameter has a specified range, a preferred range or lists upper and lower ideal values, it shall be deemed to specifically disclose all ranges consisting of any upper and lower limit pairs or ideal values, regardless of whether the same ranges are disclosed separately. For example, if a certain length of a range is disclosed as X cm to Y cm, it shall be deemed to disclose a length of H cm and H may be any real number between X and Y.

[0022] In addition, if the word "coupled" or "connected" is used, it includes any direct and indirect electrical connection means. For example, if the text describes that a first device is electrically coupled to a second device, it means that the first device can be directly connected to the second device, or indirectly connected to the second device through other devices or connection means. In addition, if the transmission or provision of an electrical signal is described, a person skilled in the art should understand that the transmission process of the electrical signal may be accompanied by attenuation or other non-ideal changes, but if the source and receiving end of the transmission or provision of the electrical signal are not specifically stated, they should be regarded as the same signal in essence. For example, if an electrical signal S is transmitted (or provided) from terminal A of an electronic circuit to terminal B of the electronic circuit, a voltage drop may be generated through the source and drain of a transistor switch and / or possible stray capacitance. However, if the purpose of this design is not to deliberately use the attenuation or other non-ideal changes generated during the transmission (or provision) to achieve certain specific technical effects, the electrical signal S at terminals A and B of the electronic circuit should be regarded as the same signal in essence.

[0023] It is understood that the terms "comprising", "including", "having", "containing", "involving", etc. used herein are open-ended, that is, they mean including but not limited to. In addition, any embodiment or claim scope of the present invention is not required to achieve all the objects, advantages or features disclosed in the present invention. In addition, the abstract part and the title are only used to assist in searching patent documents and are not used to limit the scope of the claims of the present invention.

[0024] See also Figure 2 , which is a system block diagram of a display provided by an embodiment of the present invention. The display 1 provided by this embodiment includes a backlight unit 2, a display unit 3, and a driving unit 4, wherein the backlight unit 2 is a panel composed of a plurality of sub-millimeter light-emitting diodes to provide backlight for the display 1, the display unit 3 is a panel composed of a plurality of pixel units to display image data, and the driving unit 4 is used to couple and drive the backlight unit 2 and the display unit 3. In addition, the driving unit 4 is further used to execute a method for maintaining the optical quality of the display.

[0025] See also Figure 3As shown, it is a flow chart of a method for maintaining the optical quality of a display provided by an embodiment of the present invention. The method for maintaining the optical quality of a display provided by the present embodiment is executed by the driving unit 4 in the display 1 to include the following operations, wherein whether the display unit 3 inputs an image data is not limited to this. Step S3: Provide a preset gamma value of the display 1. Step S5: Drive the driving unit 4 based on the preset gamma value of the display 1 to obtain a first display brightness value corresponding to the backlight unit 2 according to the preset gamma value. Step S7: Perform regional dimming of the backlight unit 2 in the display 1 to obtain a second display brightness value for each area in the backlight unit 2. Step S9: The driving unit 4 receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value. Step S11: Provide a brightness difference value for brightness compensation in the backlight unit 2 so that the backlight unit 2 has a third display brightness value.

[0026] First, the driving unit 4 is driven based on the preset gamma value of the display 1 to obtain a display brightness value of the backlight unit 2, wherein the preset gamma value is, for example, 2.2, but those skilled in the art can set the preset gamma value according to actual needs, so the present invention is not limited thereto. Specifically, please refer to Figure 4 FIG. 1 is a flowchart of obtaining a first display brightness value of a backlight unit according to an embodiment of the present invention, wherein step S3 further includes the following operations. Step S51: Based on the difference between the black screen grayscale measurement value and the white screen grayscale measurement value of the backlight unit 2, the display brightness value of the backlight unit 2 is obtained by normalizing the difference between the black screen grayscale measurement value and the white screen grayscale measurement value and taking the preset gamma value as the exponent, wherein the equation in step S31 is expressed as (L0_m+(L255_m-L0_m)*(Ln_m / 255)) γ , where L0_m represents the black screen grayscale measurement value of the mth sub-millimeter LED, L255_m represents the white screen grayscale measurement value of the mth sub-millimeter LED, Ln_m represents the grayscale value of the mth sub-millimeter LED corresponding to the preset gamma value, n represents 0-255, and γ represents the gamma value. It can be noted that the equation in step S51 represents one display brightness value with one sub-millimeter LED, which means that the display brightness value of the backlight unit 2 includes a plurality of display brightness values ​​corresponding to each of the plurality of sub-millimeter LEDs.

[0027] Next, the driving unit 4 performs regional dimming of the backlight unit 2 to measure a display brightness value of each region in the backlight unit 2. Figure 5As shown, it is a flowchart of performing regional dimming of a backlight unit provided by an embodiment of the present invention, wherein step S7 further includes the following operations. Step S71: Obtain the regional peak luminance value (area peak luminance / segment, APL) of each area in the backlight unit 2. Step S73: Obtain the luminance area (windows size) of the backlight unit 2 and the corresponding luminance adjustment ratio (luminance dependency of windows size, LOWS). Step S75: Perform the product of the regional peak luminance value and the luminance adjustment ratio (APL*LOWS) of each area to obtain the display luminance value of each area in the backlight unit 2. In detail, after the driving unit 4 performs the regional dimming of the backlight unit 2, the display luminance value corresponding to each sub-millimeter light-emitting diode in each area can be obtained, and the regional peak luminance value in the area can be obtained. It can be noted that the size of each area after the regional dimming of the backlight unit 2 can be automatically adjusted according to the image data of the display unit 3 or according to the setting of the backlight unit 2, that is, the area can be as small as a sub-millimeter light-emitting diode and as large as the entire panel, and the area can be different shapes such as rectangle and polygon, and the present invention is not limited thereto. Next, the driving unit 4 finds the corresponding brightness adjustment ratio according to the brightness area of ​​the backlight unit 2, wherein the brightness area is the ratio of the white screen area in the backlight unit 2 to the overall panel area of ​​the backlight unit 2, and different ratios will correspond to different brightness adjustment ratios, and the brightness area and the brightness adjustment ratio are inversely proportional, as shown in Table 1. In addition, the white screen area in the backlight unit 2 and the overall panel area of ​​the backlight unit 2 can be in different shapes such as rectangles and polygons, but the present invention is not limited thereto. Next, after the driving unit 4 obtains the regional peak brightness value and the brightness adjustment ratio of each area after regional dimming, it performs the product of the regional peak brightness value of each area and the brightness adjustment ratio to obtain the display brightness value of each area in the backlight unit 2. Figure 6 As shown, the regional peak brightness value of each area in the backlight unit 2 is as follows: Figure 6 As shown on the right side of the figure, the ratio of the white screen area in the backlight unit 2 to the overall panel area of ​​the backlight unit 2 is, for example, 50%, and the corresponding brightness adjustment ratio is 75%. The product of the regional peak brightness value of each region and the brightness adjustment ratio is as follows: Figure 6 In addition, the number of regional peak brightness values ​​increases or decreases with the number of regions after regional dimming, where Figure 6 It is only an example, and the present invention is not limited thereto. It can be noted that after the driving unit 4 performs the regional dimming of the backlight unit 2, a halo may be generated and the preset gamma value of the display 1 may be increased, making the overall image darker and the dark details disappear.

[0028] Table 1

[0029] Brightness area Brightness adjustment ratio 10％ 100％ 30％ 85％ 50％ 75％ 70％ 60％ 100％ 50％

[0030] Please refer again Figure 3 As shown, after the driving unit 4 obtains the display brightness values ​​of steps S5 and S7, it then calculates the brightness difference between the display brightness values ​​of the two steps to compensate the brightness difference to the backlight unit 2. Thus, by adjusting the brightness adjustment ratio of the backlight unit 2 according to different brightness areas and compensating the brightness difference of the backlight unit 2 in this embodiment, a backlight compensation method that can be adjusted without reducing the resolution of the image data and maintaining the brightness and optical quality is achieved, and the halo can be reduced and the brightness and gamma value can be maintained under different brightness areas.

[0031] See also Figure 7 , which is a flow chart of a method for maintaining the optical quality of a display provided by another embodiment of the present invention. The method for maintaining the optical quality of a display provided by this embodiment is executed by a driving unit 4 in a display 1 to include the following operations, wherein whether the display unit 3 inputs an image data is not limited to this. Step S1: lowering the preset gamma value of the display 1 to a first gamma value. Step S3: providing a preset gamma value of the display 1. Step S5: based on the preset gamma value of the display 1, driving the driving unit 4 to obtain a first display brightness value corresponding to the backlight unit 2 according to the preset gamma value. Step S7: performing regional dimming of the backlight unit 2 in the display 1 to obtain a second display brightness value for each area of ​​the backlight unit 2. Step S9: the driving unit 4 receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value. Step S11: providing a brightness difference value to perform brightness compensation in the backlight unit 2 so that the backlight unit 2 has a third display brightness value. It can be noted that steps S3, S5, S7, S9, and S11 in the present embodiment are the same as steps S3, S5, S7, S9, and S11 in the previous embodiment, and therefore are not described in detail herein; in the present embodiment, the reason for executing step S1 is that after the backlight unit 2 is regionally dimmed, the preset gamma value of the display 1 will increase, such as from 2.2 to 2.4, causing the overall picture to become darker while the dark details disappear. Therefore, the purpose of step S1 is that before the backlight unit 2 is regionally dimmed, the preset gamma value of the display 1 is pre-adjusted (compensated) such as from 2.2 to 2.0 to brighten the overall picture, in order to avoid the backlight unit 2 causing the overall picture to become darker while the dark details disappear after the regional dimming. Thus, by pre-adjusting the gamma value of the display 1 before local dimming, adjusting the brightness adjustment ratio of the backlight unit 2 according to different brightness areas, and compensating the brightness difference of the backlight unit 2 in this embodiment, a backlight compensation method that can be adjusted without reducing the resolution of the image data and maintaining the brightness and optical quality is achieved, avoiding the picture being too bright and causing overexposure and the picture being too dark and causing the dark details to disappear, reducing the halo, and maintaining the brightness and gamma value under different brightness areas.

[0032] See also Figure 8 , which is a flow chart of a method for maintaining the optical quality of a display provided by another embodiment of the present invention. The method for maintaining the optical quality of a display provided by this embodiment is executed by a driving unit 4 in a display 1 to include the following operations, wherein whether the display unit 3 inputs an image data is not limited by the present invention. Step S3: Provide a preset gamma value of the display 1. Step S5: Drive the driving unit 4 based on the preset gamma value of the display 1 to obtain a first display brightness value corresponding to the backlight unit 2 according to the preset gamma value. Step S7: Perform regional dimming of the backlight unit 2 in the display 1 to obtain a second display brightness value for each area of ​​the backlight unit 2. Step S9: The driving unit 4 receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value. Step S11: Provide a brightness difference value for brightness compensation in the backlight unit 2 so that the backlight unit 2 has a third display brightness value. Step S13: Adjust the brightness difference value based on the gamma difference between the compensated second gamma value of the display 1 and the preset gamma value. It can be noted that steps S3, S5, S7, S9, and S11 in this embodiment are the same as steps S3, S5, S7, S9, and S11 in the previous embodiment, and therefore are not described in detail here. In this embodiment, after compensating the brightness difference in the backlight unit 2, the driving unit 4 measures the gamma value of the display 1 again to determine the gamma difference between it and the preset gamma value, and then adjusts the brightness difference again to make the gamma value of the display 1 approach the preset gamma value. The equation in step S11 represents Δγ=γ default --log n / 255 ((Ln_m-L0_m) / (L255_m-L0_m)), where L0_m represents the black screen grayscale measurement value of the mth sub-millimeter LED, L255_m represents the white screen grayscale measurement value of the mth sub-millimeter LED, Ln_m represents the grayscale value of the mth sub-millimeter LED corresponding to the preset gamma value, n represents 0 to 255, γ default Indicates the preset gamma value and Δγ indicates the gamma difference. Thus, by adjusting the brightness adjustment ratio of the backlight unit 2 according to different brightness areas and compensating and fine-tuning the brightness difference of the backlight unit 2 in this embodiment, a backlight compensation method that can be adjusted without reducing the resolution of the image data and maintaining the brightness and optical quality is achieved, and the halo can be reduced and the brightness and gamma value can be maintained under different brightness areas.

[0033] In one embodiment, the method for maintaining the optical quality of the display is executed by the driving unit 4 in the display 1 provided by the present invention and can simultaneously include the steps S1, S3, S5, S7, S9, S11, and S13 in the aforementioned multiple embodiments, wherein the steps S1, S3, S5, S7, S9, S11, and S13 in the present embodiment are the same as the steps S1, S3, S5, S7, S9, S11, and S13 in the aforementioned multiple embodiments, and thus are not described in detail here. Thus, by pre-adjusting the gamma value of the display 1 before the local dimming, adjusting the brightness adjustment ratio of the backlight unit 2 according to different brightness areas, and compensating and fine-tuning the brightness difference of the backlight unit 2 in the present embodiment, a backlight compensation method that can be adjusted without reducing the resolution of the image data and maintaining the brightness and optical quality is achieved, avoiding the overexposure caused by the picture being too bright and the disappearance of the dark details caused by the picture being too dark, reducing the halo, and maintaining the brightness and gamma value under different brightness areas.

[0034] In summary, the method for maintaining the optical quality of a display and the display provided by the present invention can reduce the gamma value of the display before local dimming, compensate and fine-tune the brightness difference of the backlight unit, and adjust the brightness adjustment ratio of the backlight unit according to different brightness areas, thereby achieving a backlight compensation method that can be adjusted without reducing the resolution of image data and maintaining brightness and optical quality, avoiding overexposure caused by too bright a picture and disappearance of dark details caused by too dark a picture, reducing halo, and maintaining brightness and gamma value under different brightness areas.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for maintaining the optical quality of a display, characterized in that: The display has a driving unit, a display unit and a backlight unit, and the method includes: Providing a preset gamma value for the display; Based on the preset gamma value of the display, the driving unit is driven to obtain a first display brightness value corresponding to the backlight unit according to the preset gamma value; Performing regional dimming of the backlight unit in the display to obtain a second display brightness value of each area in the backlight unit; The driving unit receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value; and The brightness difference is provided in the backlight unit for brightness compensation, so that the backlight unit has a third display brightness value.

2. The method for maintaining the optical quality of a display according to claim 1, wherein: Also includes: The preset gamma value of the display is lowered to a first gamma value.

3. The method for maintaining the optical quality of a display according to claim 1, wherein: Also includes: The brightness difference is adjusted based on a gamma difference between a second gamma value after brightness compensation of the backlight unit and the preset gamma value.

4. The method for maintaining the optical quality of a display according to claim 1, wherein: Driving the driving unit based on the preset gamma value of the display to obtain the first display brightness value corresponding to the backlight unit according to the preset gamma value includes: The first display brightness value of the backlight unit is obtained by normalizing the difference between the black screen grayscale measurement value and the white screen grayscale measurement value of the backlight unit as a base and taking the preset gamma value as an exponent.

5. The method for maintaining the optical quality of a display according to claim 1, wherein: Performing regional dimming of the backlight unit in the display includes: Obtaining a regional peak brightness value of each region in the backlight unit; Acquire the brightness area and the corresponding brightness adjustment ratio of the backlight unit; The product of the regional peak brightness value of each region and the brightness adjustment ratio is performed to obtain the second display brightness value of each region in the backlight unit.

6. A display, characterized in that: include: a backlight unit; a display unit; A driving unit is coupled to the backlight unit and the display unit and is used to perform the following operations: Providing a preset gamma value for the display; Based on the preset gamma value of the display, the driving unit is driven to obtain a first display brightness value corresponding to the backlight unit according to the preset gamma value; Performing regional dimming of the backlight unit in the display to obtain a second display brightness value of each area in the backlight unit; The driving unit receives the second display brightness value, compares the second display brightness value with the first display brightness value, and obtains a brightness difference value; as well as The brightness difference is provided in the backlight unit for brightness compensation, so that the backlight unit has a third display brightness value.

7. The display according to claim 6, characterized in that The drive unit further performs: The preset gamma value of the display is lowered to a first gamma value.

8. The display according to claim 6, characterized in that The drive unit further performs: The brightness difference is adjusted based on a gamma difference between a second gamma value after brightness compensation of the backlight unit and the preset gamma value.

9. The display according to claim 6, characterized in that Driving the driving unit based on the preset gamma value of the display to obtain the first display brightness value corresponding to the backlight unit according to the preset gamma value includes: The first display brightness value of the backlight unit is obtained by normalizing the difference between the black screen grayscale measurement value and the white screen grayscale measurement value of the backlight unit as a base and taking the preset gamma value as an exponent.

10. The display according to claim 6, characterized in that Performing regional dimming of the backlight unit in the display includes: Obtaining a regional peak brightness value of each region in the backlight unit; Acquire the brightness area and the corresponding brightness adjustment ratio of the backlight unit; The product of the regional peak brightness value of each region and the brightness adjustment ratio is performed to obtain the second display brightness value of each region in the backlight unit.

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