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Method and circuits for controlling brightness of three-color luminous diode used for back light source

A light-emitting diode, brightness control technology, applied in the light source, electric light source, electroluminescent light source and other directions, can solve the problems of the color of the liquid crystal display is not pure, the mixing effect is deteriorated, etc., to keep the color pure and reduce the power consumption. Effect

Inactive Publication Date: 2007-12-05
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the differences in the attenuation characteristics of LEDs of different colors, after a period of lighting, the light mixing effect will become worse. At first, the pure white light source will become an impure white light source, resulting in impure color of the LCD screen.

Method used

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  • Method and circuits for controlling brightness of three-color luminous diode used for back light source

Examples

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Embodiment Construction

[0037] A brightness control circuit of three-color light-emitting diodes for backlight

[0038] The brightness control circuit shown in Figures 1 and 2 is provided with a peripheral circuit including a microcontroller 3 chip IC1 of a timing generating circuit 1 and a reset circuit 2, and three I / O port pins 5 of the microcontroller 3 chip IC1, 6, 7 are respectively connected with the three input ends of the light-emitting diode circuit 4, that is, the three control ends of the power switch tubes Q1, Q2, and Q3 that control the brightness of the three-color light-emitting diodes D1, D2, and D3. The memory 5 flash memory chip IC2 connected to the 3 chip IC1, and the power supply voltage monitoring circuit 6 chip IC3 connected to the memory 5 flash memory chip IC2.

[0039] The LED circuit 4 includes power switch tubes Q1, Q2, Q3, three-color LEDs D1, D2, D3, coupling resistors R2, R3, R4 and current limiting resistors R5, R6, R7. The power switch tubes Q1, Q2, and Q3 are NMOSFE...

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PUM

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Abstract

The invention discloses a brightness controlling method and circuit of tricolor luminous diode of aphototropism source, which comprises the following steps: initiating the timing program; starting the timing program; adjusting the brightness of luminous diode; setting micro-controller in the brightness control circuit with I-to-O port connecting the control end of power switch pipe of the luminous diode brightness; setting non-volatility memory to connect micro-controller; solving the white balance problem of R, G and B colored luminous diodes effectively; adjusting the white balance time to adjust the time rate of I-to-O port output level; keeping pure white light source for a long time; making the color of LCD pure without reducing the composite light effect. The invention can reduces the power consumption obviously through adjusting the pulse breadth.

Description

technical field [0001] The invention relates to brightness control of light-emitting diodes, in particular to a method and circuit for controlling brightness of three-color light-emitting diodes used in backlight sources. Background technique [0002] Light-Emitting Diode (LED for short) has the advantages of small size, low voltage, long life, fast response, no flicker, less energy consumption, less heat, etc. It is a new generation of green, energy-saving, environmentally friendly, long-life all-solid Lighting source. Since the brightness of the liquid crystal display mainly depends on the backlight source, the backlight source of the existing large-size liquid crystal display screen has almost all used the LED backlight source to replace the earlier Cold Cathode Fluorescent Lamp (CCFL). In addition to using nitride white light-emitting diodes, generally red, green and blue three-color light-emitting diode combination units are used to mix light into white light sources. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34G09G3/36G09G3/20G09G5/10G02F1/133H05B33/08H05B37/02H05B44/00
CPCY02B20/30Y02B20/40
Inventor 王尧许波
Owner BYD CO LTD
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