Brightness adjustment method and system for LED display screens

A technology for LED display and brightness adjustment, which is applied to static indicators, instruments, etc., can solve problems such as not being able to meet the requirements of 256-level grayscale scanning time length, and achieve the effect of achieving brightness consistency, realizing adjustment, and reducing sacrifice

Active Publication Date: 2015-04-01
GUANGDONG VTRON TECH CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Due to the requirement of brightness uniformity, it is necessary to reduce the brightness of an LED lamp, and the method of using pulse width to adjust the brightness is to reduce the current duty cycle, then the current duty cycle must be less than 0.6Ts to achieve the brightness requirement, at this time The t cannot meet the time length requirements of 256-level grayscale scanning, and needs to be compressed
That is, this method of pulse width adjustment brightness will sacrifice a certain gray scale effect, especially when the current pulse width adjustment range is large

Method used

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  • Brightness adjustment method and system for LED display screens
  • Brightness adjustment method and system for LED display screens
  • Brightness adjustment method and system for LED display screens

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Embodiment Construction

[0026] In order to understand more clearly the technical problems to be solved, the adopted technical solutions and the achieved technical effects of the present invention, the specific implementation of the LED display brightness adjustment system of the present invention will be introduced in detail below with reference to the accompanying drawings. It should be noted that the words first, second, etc. in the text are only used to distinguish devices of the same type in different circuits, and do not limit the order and number of devices.

[0027] like figure 1 As shown, a LED display brightness adjustment system includes a connected constant current drive circuit 200, a data acquisition and processing circuit 100, wherein the constant current drive circuit 200 includes a connected reference current generation circuit 210, a reference reference current generation circuit 220;

[0028] The reference current generation circuit 210 generates a reference current according to th...

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Abstract

The invention relates to a brightness adjustment method and system for LED display screens. The method comprises the following steps: determining current corresponding to each point through the brightness of each point, determining benchmark reference current corresponding to each point through the current corresponding to each point, and therefore adjusting the brightness of the LED display screen according to the benchmark reference current corresponding to each point. The current output peak value of a constant-current drive circuit is adjustable, and the adjustment benchmark value is set by an external resistor and is not limited by the external resistor. The overall brightness adjustment overall brightness tends to the selected standard brightness conforming to the requirement of the display screen, and the overall brightness overall brightness cannot be reduced. The method does not need to independently reply on current pulse width adjustment, and the gray-scale sacrifice is reduced, that is, under the conditions of sacrificing less gray scales and preventing display brightness reduction, the adjustment for the brightness consistency of the LED display screen is realized.

Description

technical field [0001] The invention relates to the technical field of LED display screens, in particular to a method for adjusting the brightness of an LED display screen and a system for adjusting the brightness of an LED display screen. Background technique [0002] The current full-color LED (Light-Emitting Diode, light-emitting diode) display screen adopts a dedicated constant current driver IC (integrated circuit, integrated circuit) for display. Under the existing LED manufacturing process, the luminance of each LED device is often inconsistent, so the brightness of the assembled display screen is also inconsistent. The existing LED display brightness correction method is to adjust the luminance of the LED device by adjusting the current pulse width, so that the brightness of the LED display can be consistent. However, there are two deficiencies in this correction method for adjusting the current pulse width: [0003] First, limited by the fact that the external res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32
Inventor 陈景创
Owner GUANGDONG VTRON TECH CO LTD
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