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Liquid crystal television gamma curve debugging method capable of reducing brightness loss

A technology for LCD TV and brightness loss, which is applied to TVs, electrical components, color signal processing circuits, etc. It can solve problems affecting energy efficiency and image quality performance, and large brightness loss, so as to reduce debugging brightness loss, maintain consistency, and improve The effect of energy efficiency index and picture quality

Active Publication Date: 2018-07-24
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method for debugging the gamma curve of LCD TVs that reduces the loss of brightness, which can effectively reduce the loss of brightness, maintain the consistency of the color temperature of each gray level, and improve the depth of field and energy efficiency of the picture quality at the same time ; Solve the problem that the brightness loss after gamma adjustment is too large and affect the performance of energy efficiency and image quality when the LCD TV requires consistency in color coordinates and color temperature. It can give full play to the inherent brightness of the LCD screen while ensuring the color temperature of each grayscale of the image. consistency

Method used

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  • Liquid crystal television gamma curve debugging method capable of reducing brightness loss
  • Liquid crystal television gamma curve debugging method capable of reducing brightness loss
  • Liquid crystal television gamma curve debugging method capable of reducing brightness loss

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Embodiment 1

[0053] A liquid crystal television gamma curve debugging method for reducing brightness loss, the method steps are as follows:

[0054] A. Define the coordinates and color temperature of the backlight according to the color coordinates of the whole machine and the target color temperature:

[0055] The coordinates of the backlight are designed according to the white color coordinates and color temperature target value of the LCD TV white balance. When designing the backlight, the light bar should match the spectral characteristics and transmission characteristics of the LCD display to achieve the white coordinates of the overall LCD module. And the color temperature is within the error range of the target value to reduce the brightness adjustment loss caused by correcting the color temperature to the target value;

[0056] B. The four-segment debugging method of the gamma curve, the gamma curve debugging is carried out in the following four stages through the gamma curve:

[...

Embodiment 2

[0065] A liquid crystal television gamma curve debugging method for reducing brightness loss, the method steps are as follows:

[0066] A. Define the coordinates and color temperature of the backlight according to the color coordinates of the whole machine and the target color temperature.

[0067] The implementation of the present invention is to design the coordinates of the backlight according to the white coordinates of the white balance and the color temperature target value. When designing the backlight, the light bar needs to match the spectral characteristics and transmission characteristics of the liquid crystal OC, so as to achieve the white coordinates and The color temperature is within the error range of the target value, thereby reducing the brightness adjustment loss caused by correcting the color temperature to the target value.

[0068] B. The segmented debugging method of the gamma curve divided into four segments

[0069] Gamma is divided into four sections...

Embodiment 3

[0075] A liquid crystal television gamma curve debugging method for reducing brightness loss, the method steps are as follows:

[0076] In step S1, the whole machine and the instrument are preheated. The whole machine is preheated and aged for 48 hours, the instrument is preheated for 1 hour, and the optical indicators of the liquid crystal module are tested. Experiments on the color temperature of LCD TVs with the power-on time show that when the whole machine is powered on and continues to power on, its brightness, color coordinates, and color temperature all show a downward trend with the change of warm-up time and temperature, and the speed of brightness decline varies with different LCD panels. Depending on the manufacturer, the brightness drops by about 5-30nits, and the color coordinates also drop by 0.001-0.006. Preheating for 48 hours is to ensure that the color temperature and brightness of the LCD TV can reach a relatively stable state. After 48 hours of warm-up, ...

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Abstract

The invention discloses a liquid crystal television gamma curve debugging method capable of reducing brightness loss. The liquid crystal television gamma curve debugging method in the invention comprises the steps of: A, defining the backlight coordinate and colour temperature according to the colour coordinate and the colour temperature target value of the complete machine; and B, a segmented debugging method for segmenting a gamma curve into four sections, and performing gamma curve debugging through the gamma curve in four stages. According to the liquid crystal television gamma curve debugging method capable of reducing brightness loss disclosed by the invention, due to matching of colour coordinate and colour temperature of backlight and a liquid crystal panel and target colour coordinate and colour temperature and the segmented debugging method of the gamma curve, the debugging brightness loss of a liquid crystal screen can be effectively reduced; resource waste can be reduced; the consistency in colour temperature in each gray scale in 0-255 is kept; and the energy efficiency index and the image quality of the liquid crystal screen are improved.

Description

technical field [0001] The invention relates to the technical field of gamma curve debugging, in particular to a liquid crystal television gamma curve debugging method for reducing brightness loss. Background technique [0002] At present, LCD TVs are equipped with LCD screens from various manufacturers. According to the distribution of the number of filter films on a single pixel of the LCD screen, they can be divided into RGB screens and RGBW screens. A single pixel point of RGBW has four sub-components: R, G, B, and W. pixels, while RGB screens only have three sub-pixels R, G, and B. These two screens have a large difference in brightness loss after the white light synthesis algorithm and gamma curve adjustment. The difference in pass rate and material of color filter film, together with the difference in lamp bead technology and color spectrum of LED lamp in the backlight, and the difference in film, lead to huge differences in the original screen brightness and original...

Claims

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Application Information

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IPC IPC(8): H04N17/02H04N9/73
CPCH04N9/73H04N17/02
Inventor 范小霞
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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