Method for regulating brightness efficiency of LED (light-emitting diode) display screen through adding sub-field

A technology of LED display and brightness efficiency, applied in static indicators, instruments, etc., can solve the problems of easy loss of low grayscale and poor low grayscale effect of LED display.

Inactive Publication Date: 2013-01-30
XIAN NOVASTAR TECH
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Problems solved by technology

[0006] The invention provides a method for adjusting the brightness efficiency of LED display screens by adding sub-fields, which mainly solves the problem that low gray

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  • Method for regulating brightness efficiency of LED (light-emitting diode) display screen through adding sub-field
  • Method for regulating brightness efficiency of LED (light-emitting diode) display screen through adding sub-field
  • Method for regulating brightness efficiency of LED (light-emitting diode) display screen through adding sub-field

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Embodiment Construction

[0015] The method for adjusting the brightness efficiency of an LED display by adding subfields includes the following steps:

[0016] 1] Perform inverse gamma correction on the 8-bit grayscale data of the input video signal and map it to 16-bit grayscale data;

[0017] 2] According to the brightness efficiency that needs to be reduced, calculate the number of subfields that need to be increased. For example, the brightness efficiency needs to be reduced from 87% to 68%. It is known that the total open time of the driver chip occupies 64 subfields. According to the brightness efficiency formula, it can be calculated that the number of subfields needs to be increased to 20. The number of weighted subfields of some bits in the 16-bit grayscale data processed in step 1 increases the number of weighted subfields of a certain bit, so that the new number of weighted subfields of this bit is 2 n , n is a natural number; the number of weight subfields of the remaining bits remains un...

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Abstract

The invention provides a method for regulating brightness efficiency of an LED (light-emitting diode) display screen through adding a sub-field, and mainly solves the problem that the low gray level effect of the LED display screen is poor because low gray level is lost easily when the brightness of the LED display screen in the prior art is regulated. The scheme provided by the invention is that a gray level arranging mode is changed to reduce the brightness efficiency of the LED display screen so as to reduce the brightness of a screen body. According to the mode, a y value after gamma inversion is not multiplied by the coefficient of brightness, so that the problem that the low gray level is lost when the brightness is reduced in the existing scheme can not appear.

Description

technical field [0001] The invention relates to a method for adjusting the brightness efficiency of an LED display screen by adding subfields, and the method is mainly applied in the field of LED display screen control systems. Background technique [0002] When the existing LED display control system reduces the brightness of the LED display, the problem of loss of low gray levels occurs, resulting in poor display effect. [0003] Due to the linear response characteristics of LEDs, the current LED display control needs to perform inverse gamma correction on the input 8-bit grayscale and map it to 16-bit grayscale data before performing grayscale implementation. Let x be the 8-bit input grayscale data with a value range from 0 to 255, y be the 16-bit grayscale data after inverse gamma correction, and γ be the gamma value with a value range from 1 to 4. The mapping relationship is as follows: [0004] y = 65535 * ...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 梁伟
Owner XIAN NOVASTAR TECH
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