Low grayscale correction method and system for LED display device

A technology of display device and calibration method, which is applied in the direction of static indicators, instruments, etc., can solve the problems of uneven heat distribution, LED display screen's response to current signal deviates from linearity, etc., and achieve the effect of improving clarity and fineness

Active Publication Date: 2017-06-06
XIAN NOVASTAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there are factors such as the discreteness of the LED lamp, the discreteness of the driver chip, the discreteness of the LED optical axis, the discreteness of the ink color of the mask, and the unevenness of the heat distribution inside the module, which lead to the deviation of the response of the LED display to the current signal. linear

Method used

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  • Low grayscale correction method and system for LED display device
  • Low grayscale correction method and system for LED display device
  • Low grayscale correction method and system for LED display device

Examples

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no. 1 example

[0026] The technical solution of the low-grayscale calibration method of the LED display device in the first embodiment of the present invention mainly includes two steps: firstly obtain multiple sets of brightness and chromaticity measurement values ​​respectively corresponding to the multiple low-grayscales, and then calculate multiple low-grayscale Multiple correction coefficients corresponding to each step are used as adjustment coefficients and uploaded to the LED display screen, so that the LED display screen responds linearly to the current signal when displaying low gray scales. In this embodiment, the LED display screen includes, for example, an LED screen body and a display control system electrically connected to the LED screen body. specifically:

[0027] In the process of obtaining multiple sets of brightness and chromaticity measurement values ​​corresponding to multiple low gray scales: first, control the LED display to display multiple low gray scale colors. Th...

no. 2 example

[0039] The technical solution of the low-gray-scale correction method of the LED display device in the second embodiment of the present invention mainly includes two steps: firstly obtain a plurality of brightness measurement values ​​respectively corresponding to the multiple low-gray scales, and then modify the Gamma (gamma) mapping Part of the gamma values ​​in the table are obtained after the plurality of target gamma values ​​corresponding to the plurality of low gray scales are used as adjustment coefficients and uploaded to the LED display to update the Gamma mapping table stored in the LED display, so that the LED display The response to the current signal is linear in low grayscale display. In this embodiment, the LED display screen includes, for example, an LED screen body and a display control system electrically connected to the LED screen body. specifically:

[0040] In the process of obtaining multiple brightness measurement values ​​corresponding to multiple lo...

no. 3 example

[0053] The technical solution of the low-grayscale correction method of the LED display device according to the third embodiment of the present invention mainly includes two steps: firstly obtain a plurality of luminance measurement values ​​corresponding to the multiple low-grayscales respectively, and then modify the corresponding brightness values ​​of each low-grayscale The OE width corresponding to the bit (Bit) of the binary code obtains multiple target OE widths as adjustment coefficients and uploads them to the LED display to update the OE width corresponding to each low grayscale bit stored in the LED display, so that the LED The display responds linearly to the current signal when displaying in low grayscale. In this embodiment, the LED display screen includes, for example, an LED screen body and a display control system electrically connected to the LED screen body. specifically:

[0054] In the process of obtaining multiple brightness measurement values ​​correspond...

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Abstract

The invention relates to a low grey scale correction method and system of an LED display device. The method comprises the steps that (a) the LED display device is controlled to display colors of multiple gray scales, and data acquisition is carried out on the colors of multiple gray scales so as to at least acquire multiple brightness measurement values corresponding to the multiple gray scales, wherein the colors are the same basic color, and the multiple gray scales are part of gray scales, within a low grey scale range, of all gray scales corresponding to the basic color; (b) multiple regulation coefficients corresponding to the multiple gray scales are acquired at least through the difference between the acquired multiple brightness measurement values and brightness target values corresponding to the multiple gray scales, and the multiple regulation coefficients are uploaded to the LED display device so that the LED display device can change the LED driving current according to the multiple regulation coefficients when displaying the multiple grey scales and the multiple grey scales can be corrected. According to the low grey scale correction method and system of the LED display device, by correcting the low grey scales one by one, the LED display device can make a linear response to current signals when displaying the low grey scales.

Description

technical field [0001] The present invention relates to the technical field of LED display, in particular to a low grayscale correction method for an LED display device and a low grayscale correction system for an LED display device. Background technique [0002] Gray scale is the so-called gray scale, which refers to the lightness and darkness of the brightness; in the LED display industry, it specifically refers to the luminous brightness of each primary color. The luminance of the primary color is divided by intensity, which is the gray level. The higher the gray level that the LED display can produce, the more colors and image levels it can display. For digital display technology, grayscale is the determining factor for the number of displayed colors. Generally speaking, the higher the grayscale, the richer the displayed colors, the more delicate the picture, and the easier it is to express rich details. [0003] In digital systems, the ability to control gray levels ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32
Inventor 杨城梁伟
Owner XIAN NOVASTAR TECH
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