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Optical sensor for sensing peripheral light and liquid crystal display device using the same

An optical sensor, liquid crystal display technology, used in the direction of photometry, optics, static indicators, etc. using electrical radiation detectors, which can solve problems such as consumption

Active Publication Date: 2011-02-16
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, the backlight unnecessarily consumes about 80% of the power needed to drive the LCD, which is not ideal

Method used

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  • Optical sensor for sensing peripheral light and liquid crystal display device using the same
  • Optical sensor for sensing peripheral light and liquid crystal display device using the same
  • Optical sensor for sensing peripheral light and liquid crystal display device using the same

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Experimental program
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Embodiment Construction

[0028] figure 1 Displays a modern active-matrix liquid crystal display (LCD). refer to figure 1 , the modern LCD typically consists of a pixel area 2 , a scan driver 4 , a data driver 6 , a gamma voltage source section 8 , a timing controller 10 , and a backlight driver 12 .

[0029] In the pixel area 2, m×n liquid crystal cells Clc are arranged in a matrix pattern formed by intersecting m data lines D1 to Dm and n scanning lines S1 to Sn. A thin film transistor TFT is formed at each intersection of the data lines D1 to Dm and the scan lines S1 to Sn. Scan signals are supplied from the scan driver 4 to the scan lines S1 to Sn. Data signals are supplied from the data driver 6 to the data lines D1 to Dm. The gamma voltage is supplied to the data driver 6 by the gamma voltage source section 8 . The timing controller 10 supplies control signals to the scan driver 4 and the data driver 6 . The backlight driver 12 drives the backlight 14 to supply light to each liquid crysta...

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Abstract

An optical sensor providing enhanced reliability in sensing peripheral light and reduced power consumption, and a liquid crystal display device incorporating this optical sensor. In the optical sensor, a first transistor is electrically coupled between a first power supply and a second transistor, which is electrically coupled between the first transistor and a second power supply having a voltage less than that of the first power supply. The first transistor is either turned-on or turned-off according to a control signal. The second transistor controls an amount of an electric current flowing from the first transistor to the second power supply corresponding to an intensity of peripheral light. A sensing section is constructed with a first capacitor electrically coupled to the second transistor in parallel. A gate electrode of the second transistor is electrically coupled to the second power supply.

Description

[0001] References to relevant application documents [0002] This application claims the benefit of Korean Patent Application Nos. 2006-0034694, 2006-0034695, and 2006-0034696 filed with the Korean Intellectual Property Office on April 17, 2006, the disclosures of which are incorporated herein by reference. technical field [0003] The present invention relates to an optical sensor for detecting ambient light and a liquid crystal display device using the optical sensor, in particular to an optical sensor capable of detecting ambient light with high reliability and low power consumption, and an optical sensor containing the optical sensor Liquid crystal display device. Background technique [0004] Various flat panel displays have been developed in recent years, which have reduced weight and volume to overcome inherent disadvantages of cathode ray tubes (CRTs). Flat panel displays include liquid crystal displays (LCDs), field emission displays (FEDs), plasma display panels ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G02F1/133H03F3/16H03F3/20
CPCG01J1/44G02F1/0123G02F1/133611G09G3/34
Inventor 金正晥
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD