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Uniformity correcting method for separating brightness and chromaticity of LED display screen

A technology for LED display and uniformity correction, which is applied in the direction of using solid-state color display device image reproducer, color signal processing circuit, picture duplicator, etc.

Active Publication Date: 2010-11-24
CHANGCHUN CEDAR ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0049] According to the above requirements, the chromaticity parameters of each display module (display pixel) must first be provided. If the chromaticity parameters of the LED display are inconsistent, they are distributed according to the module, which is relatively easy to operate, and the chromaticity parameters are inconsistent. It is basically impossible to deal with the patented method

Method used

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  • Uniformity correcting method for separating brightness and chromaticity of LED display screen
  • Uniformity correcting method for separating brightness and chromaticity of LED display screen
  • Uniformity correcting method for separating brightness and chromaticity of LED display screen

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Embodiment 1

[0114] 1) For LED display screens (including M rows and N columns of display modules, and each display module contains I rows and J columns of pixels), in view of the chromaticity difference in the display modules can be ignored, the chromaticity in the display modules is regarded as the same , using the brightness and chromaticity detector to obtain the chromaticity coordinates of M×N modules of the LED display screen, so that the chromaticity coordinates of all display pixels can be determined. So there are:

[0115] x r _ [ m , n ] [ i , j ] = ...

Embodiment 2

[0141] Considering that the display characteristics of LED are not completely linear, it needs to be converted into linear data for real-time calculation when performing brightness and chromaticity correction, and sometimes data output is required after the calculation is completed, so an inverse conversion is also required.

[0142] Here, it is assumed that the display function characteristics of each primary color of the LED are:

[0143] R L = Φ R ( R ) G L = Φ G ( G ) ...

Embodiment 3

[0152] Separated uniformity adjustment method with module-by-module correction of chroma and point-by-point correction of luminance

[0153]Embodiments 1 and 2 adopt the method of firstly correcting the brightness of each pixel and then adjusting the module chromaticity to correct the brightness and chromaticity of the display screen. Although a large amount of storage space is saved, the control process is relatively complicated. This embodiment adopts the method of first correcting the chromaticity module by module and then correcting the brightness point by point. The purpose is to simplify the control process of the correction as much as possible on the basis of saving storage space.

[0154] The specific implementation steps are as follows:

[0155] (1) In view of the fact that the chromaticity difference in the display module can be ignored, the chromaticity in the display module is regarded as the same, and the chromaticity coordinates of M×N modules of the LED display ...

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Abstract

The invention relates to a uniformity correcting method for separating brightness and chromaticity of an LED display screen, which comprises the following steps of: detecting the chromaticity parameter of any pixel in each module in the LED display screen as a chromaticity coordinate of the module of the pixel; collecting brightness parameters of all display pixels; determining reference chromaticity coordinates and reference brightness of each reference color of the display screen; separating the parameters of the brightness and the chromaticity; forming a brightness correcting coefficient table aiming at any pixel in each module; forming a module chromaticity space transformation parameter matrix for any one module; obtaining corrected real-time driving display data by using the brightness correcting coefficient table and the module chromaticity space transformation parameter matrix; and driving the display screen by the real-time driving display data. By the method, the uniformity correcting problem of the chromaticity of the LED display screen is effectively solved, and the collecting efficiency of the chromaticity parameters is high.

Description

technical field [0001] The invention belongs to the technical field of flat-panel video display of light-emitting diodes, and relates to a method for correcting brightness and chromaticity separation uniformity of an LED display screen which improves the image display quality, display color and uniformity of the flat-panel display. Background technique [0002] For LED flat panel display, its luminous panel is composed of tens of thousands, even millions of independent full-color light-emitting diodes (hereinafter referred to as LED tubes) or LED display modules formed by LED tubes. Due to the influence of the physical characteristics of the LED semiconductor device itself and its production process, there are inconsistencies in the LED display module and between modules, which makes the brightness and chromaticity distribution of the LED flat panel display uneven. [0003] It is manifested that the distribution positions of each display module on the screen (up to the small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/30H04N9/64
Inventor 王瑞光丁铁夫陈宇郑喜凤肖传武
Owner CHANGCHUN CEDAR ELECTRONICS TECH CO LTD
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