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Liquid crystal display

一种液晶显示器、电容器的技术，应用在静态指示器、仪器、非线性光学等方向，能够解决降低光照度检测准确性、输出感应电压偏离等问题

Inactive Publication Date: 2012-11-07
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As a result, a difference in the amount of discharge current due to a change in the time-varying characteristic causes a deviation in the output induced voltage, thereby reducing the accuracy of illuminance detection, and the difference becomes a major factor in the change in luminance of the backlight over time, regardless of whether the illuminance condition the same irrelevant

Method used

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Examples

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Embodiment Construction

[0028] Reference will now be made to an embodiment of the invention, an example of which is illustrated in the accompanying drawings.

[0029] refer to image 3 , a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal display panel 10, a data drive circuit 20, a gate drive circuit 30, a timing controller 40, a clock generator 42, an external light detection circuit 50, a sensor control signal generator 60 . PWM duty controller 70 , PWM generator 80 , light source driver 90 and backlight 100 .

[0030] The liquid crystal display panel 10 includes liquid crystals formed between two glass substrates. Data lines D1 to Dm and gate lines G1 to Gn are formed to cross each other on the lower glass substrate of the liquid crystal display panel 10 . TFTs formed at respective intersections of the data lines D1 to Dm and the gate lines G1 to Gn apply analog data voltages to the liquid crystal cells Clc via the data lines D1 to Dm...

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PUM

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Abstract

Provided is a liquid crystal display for adjusting the luminance of a backlight of a liquid crystal display panel in accordance with the illuminance of external light. The liquid crystal display comprises: an external light sensing circuit including a photosensor, a capacitor and a write switch; and a PWM duty controller controlling the duty: ratio of a pulse width modulation signal used for controlling the brightness of the back light, wherein a control signal applied to the gate electrode of the photosensor is generated at a first logic level during a sensing permitting period, and is generated at a second logic level during a sensing blocking period.

Description

technical field [0001] The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of adjusting the luminance of a backlight according to ambient illuminance. Background technique [0002] This application claims priority from Korean Patent Application No. 10-2008-0059884 filed on Jun. 24, 2008, the entire contents of which are hereby incorporated by reference. [0003] In general, liquid crystal displays (hereinafter referred to as LCDs) have a tendency to gradually expand their application scope due to their lightness, thinness and low power consumption. According to this trend, LCDs are used in office automation equipment, audio / video devices, and the like. The LCD adjusts the amount of transmitted light of a light beam according to applying an image signal to a plurality of control switches arranged in a matrix, thereby displaying a desired image on a screen. [0004] Since the LCD device is not a self-emitting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G2320/043G09G3/3659G09G2320/064G09G3/3406G09G2310/0254G09G2360/144G09G2300/0426G09G3/36G09G3/20G02F1/133
Inventor 郭种旭孙源邵
Owner LG DISPLAY CO LTD