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Detection and regulation method for LCD brightness

A liquid crystal display, brightness technology, applied in the direction of comparison with the reference electrical parameters, lighting devices, light sources, etc., can solve problems such as damage to eyesight, reduction of lamp brightness, etc.

Inactive Publication Date: 2004-01-07
QUISDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the light tube on the backlight will gradually reduce the brightness of the light tube as the time of use increases.
When the brightness is not enough, initial users may not be aware of it, but it will still damage eyesight

Method used

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  • Detection and regulation method for LCD brightness
  • Detection and regulation method for LCD brightness
  • Detection and regulation method for LCD brightness

Examples

Experimental program
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Embodiment Construction

[0017] The invention provides a method for adjusting the brightness of a backlight source of a liquid crystal display. figure 1 It is a block diagram of the present invention. Such as figure 1 As shown, the LCD 10 includes a backlight 12 , a luminance sensor 14 , an A / D converter 16 , a microprocessor 18 , and a memory 20 . The light sensor 14 is used to detect the brightness of the backlight 12 . The analog / digital converter 16 converts the analog signal into a digital signal. The microprocessor 14 is used for comparing the detection result with the preset value and transmitting instructions for controlling the brightness of the backlight 12 . The memory 20 is used for storing a predetermined value. The predetermined value includes brightness information.

[0018] Please refer to figure 2 , figure 2 It is a flow chart of the brightness adjustment method in Embodiment 1. Embodiment 1 of the present invention is applied to the brightness setting of liquid crystal disp...

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PUM

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Abstract

This invention provides a method for adjusting and detecting brightness of a back light source of a LCD including designing a predetermined value with brightness information then to detect brightness of a back light source with a light sensor to get a detection value to be an analog signal to be converted into a digital signal by an analog / digital converter to be compared with the predetermined value by a microprocessor, if the digital signal is not equal to the predetermined value, then the microprocessor determines an adjust value and adjusts the brightness of the back light source.

Description

technical field [0001] The invention relates to a liquid crystal display, in particular to a liquid crystal display capable of adjusting and detecting screen brightness. Background technique [0002] A liquid crystal display with a backlight refers to a liquid crystal panel that is illuminated by a backlight on the back of the display. After the light is output, it passes through the LCD panel to display the image. This LCD panel has enough high contrast to allow users to see images clearly even in dark places. [0003] Generally speaking, the light source used in the backlight must have the characteristics of high brightness and long life. Currently, there are cold cathode fluorescent tubes (cold cathode fluorescent tubes), LEDs, and electroluminescence (EL), among which cold cathode fluorescent tubes are used. Lighting (CCFL) is the mainstream. As far as the position of the light source is concerned, it can be divided into two types: direct-lit ...

Claims

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Application Information

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IPC IPC(8): G01J1/10H05B41/38
Inventor 谢长发
Owner QUISDA CORP
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