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LED display device and LED screen brightness uniformity regulating method

A technology of brightness uniformity and display device, applied in static indicators, instruments, etc., can solve the problem of uneven brightness and darkness of LED display

Inactive Publication Date: 2015-03-04
GUANG ZHOU NEW VISION OPTO ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to avoid the deficiencies of the prior art and provide an LED display device and a method for adjusting the brightness uniformity of the LED screen. Under high gray scales, current modulation is used to realize LED brightness adjustment, which can reduce the LED driving current and improve the LED screen display. Quality, prolong the life of the LED display; and use pulse width modulation to adjust the LED brightness at low gray levels, which solves the problem of serious uneven brightness and darkness of the LED display at low gray levels, and improves the display quality of the LED display

Method used

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  • LED display device and LED screen brightness uniformity regulating method
  • LED display device and LED screen brightness uniformity regulating method
  • LED display device and LED screen brightness uniformity regulating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A LED display device, such as figure 1 As shown, a data processor, a row driver chip, a column driver chip, an LED display array, a power supply module VCOM and a power supply terminal VDD are provided.

[0042] The data processor outputs signals to the row driver chip and the column driver chip respectively, the output terminals of the row driver chip are connected to the rows of the LED display array, and the output terminals of the column driver chip are connected to the LED display array The power supply module VCOM and the power supply terminal VDD are respectively connected to the LED display array.

[0043] The LED display array is provided with a plurality of LED monomers, and the brightness threshold of each LED monomer is set to L min , L min The corresponding uniformity is A, L min The corresponding grayscale data is n min , the grayscale data input to the pixel drive circuit of the LED monomer at any time is n in ; when n in greater than or equal to n ...

Embodiment 2

[0061] A method for adjusting brightness uniformity of an LED screen, adopting the LED display device of Embodiment 1 to adjust, and the data processor compares the input voltage data with the L min For comparison, when the LED monomer is in a low gray-scale state, adjust the line scanning signal through the duty cycle to realize the brightness uniformity adjustment of the LED monomer in a low gray-scale state; when the LED monomer is in a high gray-scale state, the data processing The device does not process the input voltage data, that is, the LED monomer is in a low gray-scale state, and the LED brightness adjustment is realized by current control modulation.

[0062] The data adjusted by the data processor provides signals to the row driver chip and the column driver chip respectively through the data processor, and the row driver chip sends the processed row scanning signal to the rows of the LED display array, and the row driver chip sends the row scan signal to the row o...

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Abstract

The invention relates to an LED (Light-Emitting Diode) display screen and an LED screen brightness uniformity regulating method. The device is provided with a data processor, a row driving chip, a line driving chip, an LED display array, a power supply module VCOM (Virtual Computer) and a power supply end VDD (Virtual Device Driver); the data processor respectively outputs signals to the row driving chip and the line driving chip; the output end of the row driving chip is connected with rows of the LED display array; the output end of the line driving chip is connected with lines of the LED display array; the power supply module VCOM and the power supply end VDD are respectively connected with the LED display array; the LED display array is provided with a plurality of LED units; the data processor compares input voltage data with nmin, and when the LED monomers are in a low gray scale state, the duty ratio is regulated by a row scanning signal so as to realize brightness uniformity regulation under the condition that the LED units are in the low gray scale state. According to the method, display quality of the LED screen can be improved and the service life of the LED display screen can be prolonged in the high gray scale; brightness uniformity of the LED screen can be improved in the low gray scale.

Description

technical field [0001] The invention relates to the technical field of LED display, in particular to an LED display device and a method for adjusting brightness uniformity of an LED screen. Background technique [0002] The LED display screen is composed of small LED module panels. The LED display screen can be used to display various information such as text, images, videos, and video signals. As a visual information display device, LED display has the characteristics of variable information, rich colors, wide adjustable range of brightness, low ICBC, high reliability, and long life. It has played an increasingly important role in the field of modern display technology. role. [0003] The brightness of the LED display is a very critical factor, which needs to be flexibly changed according to different environments. In the prior art, the brightness of the LED is usually controlled by controlling the magnitude of the current applied to the LED. However, when the current is ...

Claims

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Application Information

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IPC IPC(8): G09G3/32
Inventor 王春阜王磊马雪雪吴为敬李洪濛
Owner GUANG ZHOU NEW VISION OPTO ELECTRONICS TECH
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