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Method and device for adjusting low gray scales of LED

A light-emitting diode, low grayscale technology, used in instruments, static indicators, etc., can solve the problem of non-linearity of current signal response, can not solve the problem of non-linearity of current signal response of LED display screen, etc., to improve clarity and fineness, the effect of correcting low grayscale nonlinearities

Active Publication Date: 2015-03-25
XIAN NOVASTAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method of Gamma correction is generally used to smoothly expand the details of bright and dark, and cannot solve the nonlinear problem of the response to the current signal when the LED display is in low grayscale.
The second method modifies the low-grayscale Gamma mapping table one by one, which cannot solve the non-linear problem of multiple batches of cabinets responding to current signals at low grayscales.
The second method modifies the OE width corresponding to the bit one by one, which cannot solve the non-linear problem of multiple batches of cabinets responding to current signals at low gray levels

Method used

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  • Method and device for adjusting low gray scales of LED
  • Method and device for adjusting low gray scales of LED
  • Method and device for adjusting low gray scales of LED

Examples

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no. 1 example

[0032] see figure 1 , figure 1 It is a flow chart of the method for adjusting the low gray scale of the LED provided by the first embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0033] Step S101, classify different light points according to the preset classification standard, and the brightness and chromaticity values ​​corresponding to each type of light point are equal;

[0034] Specifically, different light points are classified according to the classification information of the known light points (for example, the same type of light points correspond to the same brightness and chromaticity value), or the cluster recognition method, so as to identify each batch of LED light points. Wherein, the cluster recognition method may include, but is not limited to: partitioning methods, hierarchical methods, density-based methods, grid-based methods, Model-based methods and so on.

[0035] Step S102, respectively acquiring brightness and c...

no. 2 example

[0055] see figure 2 , figure 2 It is a flow chart of the method for adjusting the low gray scale of the LED provided by the second embodiment of the present invention. Such as figure 2 As shown, the method includes:

[0056] Step S201, classify each light point of different batches as a separate category;

[0057] Step S202, respectively acquiring brightness and chromaticity values ​​corresponding to each gray scale of each type of light point;

[0058] Specifically, firstly, the display screen is controlled to display colors of each gray scale, and the display method may be to make the entire screen display a color of a certain gray scale, such as a pure color. Then obtain the brightness and chromaticity value Lxy corresponding to each gray scale, specifically, the method for obtaining the brightness and chromaticity value Lxy corresponding to each gray scale may include but not limited to: measure the brightness and chromaticity value Lxy again and again by a spectros...

no. 3 example

[0077] see image 3 , image 3 It is a flow chart of the method for adjusting the low gray scale of the LED provided by the third embodiment of the present invention. Such as image 3 As shown, the method includes:

[0078] Step S301, classify different light points according to the preset classification standard, and the brightness and chromaticity values ​​corresponding to each type of light point are equal;

[0079] Specifically, the different lamp points are classified according to the classification information of the known lamp points, or the cluster recognition method, so as to identify each batch of LED lamp points. Wherein, the cluster recognition method may include, but is not limited to: partitioning methods, hierarchical methods, density-based methods, grid-based methods, Model-based methods and so on.

[0080] Step S302, respectively acquiring brightness and chromaticity values ​​corresponding to each gray scale of each type of light point;

[0081] Specific...

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Abstract

The invention provides a method for adjusting the low gray scales of an LED. The method comprises the steps that different lamp points are classified according to the preset classification standard, and bright chromatic values corresponding to all types of the lamp points are the same; the bright chromatic value corresponding to the respective gray scale of each type of lamp points is obtained; corresponding target bright chromatic values are set for the gray scales of all types of the lamp points; correction coefficients reaching the target bright chromatic values and corresponding to the respective gray scales of all types of the lamp points are calculated according to the target bright chromatic values and the obtained bright chromatic values corresponding to the respective gray scales of all types of the lamp points; the correction coefficients are uploaded to display control devices of the lamp points, so that the display control devices control the lamp points according to the corresponding correction coefficients to be displayed according to the target bright chromatic values. The invention further provides a device for adjusting the low gray scales of the LED. The method and device for adjusting the low gray scales of the LED can improve the definition and smoothness of a picture when an LED display screen composed of multiple batches of nodes is in the low gray scale.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method and device for adjusting the low gray scale of a light emitting diode. Background technique [0002] The gray scale is the so-called gray scale, which refers to the lightness and darkness of the brightness. In the light-emitting diode (LED, Light Emitting Diode) display industry, it specifically refers to the luminous brightness of each primary color. Divide the luminous brightness of the base color according to the intensity, which is the gray level. The higher the gray levels that a display can produce, the more layers of colors and images can be displayed. The LED screen is a linear light-emitting device, but it is not linear when the current pulse width is narrow (that is, low gray scale). When the current pulse width is very narrow, the chip and LED tube used in the LED screen will deviate from the linear response to the current. In addition, there are still fac...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 杨城赵星梅
Owner XIAN NOVASTAR TECH