Brightness peak clipping method for backlight partition liquid crystal display television

Abstract

The invention provides a brightness peak clipping method for a backlight partition liquid crystal display television, and relates to the technical field of liquid crystal display television brightness control. Backlight full-white-field current and peak current of the liquid crystal display television, a brightness peak curve of a current state and an APL value corresponding to a peak clipping starting point position of the brightness peak curve are obtained; according to the method, a peak clipping function is determined as a parameter of a linear function, the linear function is adopted to carry out peak clipping processing on a brightness peak value curve of a current state, a corrected peak value brightness curve is obtained, abrupt change of the peak value brightness curve caused by adopting a backlight partitioning algorithm is avoided, and the brightness of the backlight is improved. And controlling the brightness of the liquid crystal display television according to the corrected peak brightness curve, thereby solving the problem of low impression experience caused by abrupt change of the peak brightness curve, and being suitable for brightness control of the backlight partition liquid crystal display television.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal television brightness control, and in particular to a brightness peak clipping method for a backlight partitioned liquid crystal television. Background Art

[0002] With the development of display driving technology, more and more LCD TV products use backlight partitioning technology to improve peak brightness. For example, the application number 202110275455.4 discloses a method and device for improving the contrast of LCD TVs with multi-partition backlight systems. It specifically discloses setting the average brightness of the current frame signal to the dynamic threshold value AvgL, and the duty cycle Pij corresponding to each partition. By comparing the size of AvgL and Pij, it is determined whether to perform brightness enhancement or brightness reduction processing, and the before and after values are adjusted according to the duty cycle of each partition. The size of the driving current is changed by judging the threshold value, thereby adjusting the brightness of each partition and improving the contrast of the image display. Therefore, the above-mentioned brightness partitioning algorithm will make the bright partition brighter, which is likely to bring about abrupt changes in the peak brightness curve, resulting in a reduction in the viewing experience. Summary of the Invention

[0003] The technical problem solved by the present invention is as follows: The present invention provides a brightness peak clipping method for a backlight partitioned liquid crystal television, which solves the problem of poor viewing experience caused by the abrupt changes in the peak brightness curve of the backlight partitioning algorithm used in existing liquid crystal televisions.

[0004] The present invention solves the above technical problems by adopting a technical solution: a brightness peak clipping method for a backlight partitioned liquid crystal television, comprising the following steps: S1. Obtain the full white field current and peak current of the backlight of the LCD TV; S2. Obtain the brightness peak curve of the current state; S3, obtaining the APL value corresponding to the peak clipping starting point of the brightness peak curve; S4. Obtain a peak clipping function based on the backlight full white field current, peak current, and the APL value corresponding to the peak clipping starting point. The peak clipping function is a linear function, and its expression is: ,in, , , Indicates the backlight full white field current, represents the peak current, Indicates the APL value corresponding to the peak clipping starting point; S5. Use the linear function to perform peak clipping on the current state's peak brightness curve to obtain a corrected peak brightness curve, and control the brightness of the LCD TV according to the corrected peak brightness curve.

[0005] Furthermore, in S2, a peak brightness algorithm is used to obtain a brightness peak curve of the current state.

[0006] Beneficial effects of the present invention: The present invention provides a brightness peak clipping method for a backlight partitioned liquid crystal television. By obtaining the full white field current and peak current of the backlight of the liquid crystal television, the brightness peak curve of the current state, and the APL value corresponding to the peak clipping starting position of the brightness peak curve, the peak clipping function is determined to be a parameter of a linear function. The linear function is used to perform peak clipping on the brightness peak curve of the current state to obtain a corrected peak brightness curve, thereby avoiding the abrupt change of the peak brightness curve caused by the backlight partitioning algorithm. The brightness of the liquid crystal television is controlled according to the corrected peak brightness curve, thereby solving the problem of low viewing experience caused by the abrupt change of the peak brightness curve. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a flow chart of a brightness peak clipping method for a backlight partitioned liquid crystal television provided by the present invention; Figure 2 The diagram is a comparison diagram of a peak brightness curve after correction using a brightness peak clipping method for a backlight partitioned liquid crystal television provided by the present invention and a brightness curve before correction. DETAILED DESCRIPTION

[0008] The present invention aims to solve the problem that the peak brightness curve of the existing LCD TV using the backlight partitioning algorithm changes abruptly, resulting in a poor viewing experience. A brightness peak clipping method for a backlight partitioned LCD TV is provided. Figure 1 As shown, the following steps are included: S1. Obtaining the full white field current and peak current of the backlight of the LCD TV. Specifically, the full white field current and peak current of the backlight of the LCD TV are determined by hardware specifications.

[0009] S2. Obtain a brightness peak curve of the current state; specifically, the brightness peak curve is a brightness curve corresponding to an APL window area ranging from 0% to 100%.

[0010] S3. Obtain the APL value corresponding to the peak clipping starting position of the brightness peak curve. Specifically, the peak brightness algorithm is used to obtain the brightness peak curve of the current state. The peak brightness algorithm belongs to the existing technology, such as the brightness partitioning algorithm recorded in a method and device for improving the contrast of LCD TVs with multi-partition backlight systems disclosed in application number 202110275455.4.

[0011] S4. Obtain a peak clipping function according to the backlight full white field current, the peak current, and the APL value corresponding to the peak clipping starting position, wherein the peak clipping function is a linear function.

[0012] Specifically, the expression of a linear function is: , when the backlight is full white, ; The current at the peak clipping starting point is taken as the new peak current, recorded as , then at the peak clipping starting point, , can be solved to get, , , Indicates the backlight full white field current, represents the peak current, Indicates the APL value corresponding to the peak clipping starting point.

[0013] S5. Use the linear function to perform peak clipping on the current state's peak brightness curve to obtain a corrected peak brightness curve, and control the brightness of the LCD TV according to the corrected peak brightness curve.

[0014] Example: The full white field current of the backlight of a certain LCD TV is 25mA, and the peak current is 65mA. The peak brightness algorithm is used to obtain the current state peak brightness curve as shown below: Figure 2 As shown in the original curve, there is a sudden change in brightness between the APL value of 20% and 60%. Therefore, the APL value corresponding to the peak clipping starting point of the brightness peak curve is 20%. When the backlight is full white, , at the peak clipping starting point, , and the solution is , , then the expression of the linear function is: , through this linear function Figure 2 The original curve in is clipped to obtain the corrected peak brightness curve as shown in Figure 2 The brightness of the LCD TV is controlled according to the smooth curve in the figure, which solves the problem of low viewing experience caused by abrupt changes in peak brightness.

Claims

1. A brightness peak clipping method for a backlight partitioned liquid crystal television, characterized in that: The following steps are involved: S1. Obtain the full white field current and peak current of the backlight of the LCD TV; S2. Obtain the brightness peak curve of the current state; S3, obtaining the APL value corresponding to the peak clipping starting point of the brightness peak curve; S4. Obtain a peak clipping function based on the backlight full white field current, peak current, and the APL value corresponding to the peak clipping starting point. The peak clipping function is a linear function, and its expression is: ,in, , , Indicates the backlight full white field current, represents the peak current, Indicates the APL value corresponding to the peak clipping starting point; S5. Use the linear function to perform peak clipping on the current state's peak brightness curve to obtain a corrected peak brightness curve, and control the brightness of the LCD TV according to the corrected peak brightness curve.

2. The brightness peak clipping method for a backlight zoned liquid crystal television according to claim 1, characterized in that: In S2, a peak brightness algorithm is used to obtain the brightness peak curve of the current state.

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