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Light-adjusting method of light-emitting diode backlight

A LED display and backlight technology, applied in static indicators, instruments, etc., can solve the problems of changing backlight intensity and discomfort of human eyes, and achieve the effect of reducing discomfort

Inactive Publication Date: 2010-07-28
NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the existing dimming circuit is working on the ordinary LED backlight model, the brightness adjustment needs to be realized through menu adjustment, so that the display cannot change the backlight intensity according to the change of the ambient light intensity, and it will bring discomfort to the human eye

Method used

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  • Light-adjusting method of light-emitting diode backlight
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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the drawings.

[0016] Such as figure 2 As shown, the dimming method of the LED display backlight of the present invention firstly connects the photosensitive device, the analog-to-digital converter, the pulse width modulation generator and the dimming circuit to form an adaptive dimming circuit; the photosensitive device can be adjusted according to the external Use the light intensity of the environment to judge and output different LED working voltages, and then quantize the voltage into a digital signal through the analog-to-digital converter and transmit the digital signal to the pulse width modulation generator. The pulse width modulation generator is based on the quantized digital The signal generates a corresponding duty cycle pulse signal. This pulse signal is transmitted to the PWM pin of the IC in the dimming circuit, so that the DC boost converter circuit is switched at a frequ...

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PUM

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Abstract

The invention discloses a light-adjusting method of light-emitting diode (LED) backlight. The method comprises the following steps: successively connecting a photosensitive device, an analog-to-digital converter, an impulse width modulation generator and a light-adjusting loop to form a self-adapting light-adjusting loop; using the photosensitive device to convert the sensed environmental light intensity to a voltage; using the analog-to-digital converter to quantize the voltage to a digital signal; using the impulse width modulation generator to generate a corresponding duty ratio pulse signal according to the quantized digital signal, and transmitting the pulse signal to the PWM pin of an IC of the light-adjusting loop to turn on / off a AC boost switching circuit under a set frequency and automatically adjust the LED brightness. The invention has the advantage that the monitor can adaptively change the backlight intensity according to the change of the light intensity of use environment so as to reduce the discomfort of eyes caused by too high or too low brightness; and the user can adaptively open or close adaptive options through a menu according to own demand.

Description

Technical field [0001] The invention relates to a dimming method of a backlight, in particular to a dimming method of an LED display backlight. Background technique [0002] The current dimming principle of LED display is: use a certain duty cycle signal of about 200Hz to modulate the switch of the backlight module, adjust the duty cycle to make the output different brightness, manually adjust the menu through the menu, adjust the brightness through the OSD 0~100%, after software calculation, it corresponds to 8bit quantization to 0~256 steps. The quantized signal is transmitted to the PWM generating circuit inside MICOM and outputs a certain frequency (about 200Hz) adjustable duty cycle pulse signal. Such as figure 1 As shown, the PWM control IC is controlled by a duty cycle signal to make the boost converter switch at a certain frequency (about 200 Hz), so that the backlight module of the display operates in a constant on and off mode , So as to control the backlight brightnes...

Claims

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Application Information

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IPC IPC(8): G09G3/34
Inventor 潘建军
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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