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Image display device

An image display device and image display area technology, which is applied to identification devices, static indicators, instruments, etc., can solve the problems of low energy efficiency, long grid length, and increase the power consumption of the final image display device, and achieve low power consumption. Effect

Inactive Publication Date: 2003-07-02
SAMSUNG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this results in lower energy efficiency and increases the power consumption of the final image display device
Also, since a transistor with low conductivity has a longer gate length, the larger size of the transistor is a disadvantage for the high resolution trend

Method used

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Embodiment Construction

[0055] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. figure 1 A general structure of an image display device according to one embodiment of the present invention is shown. exist figure 1 In this embodiment, a plurality of scanning lines 2 for transmitting scanning signals are distributed in an image display area on a substrate (not shown) forming part of a display panel. A plurality of signal lines 3 for transmitting signal voltages also intersect (perpendicularly) the respective scanning lines. Each scanning line 2 is connected to a scanning driving circuit 41 so that scanning signals are sequentially output from the scanning driving circuit 41 to each scanning line 2 . Each signal line 3 is then connected to a signal driving circuit 42 so that a signal voltage is supplied to each signal line 3 in accordance with image information from the signal driving circuit 42 . In addition, a plurality of powe...

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Abstract

As each of sampling switch elements turns on in response to a scanning signal, a signal voltage from a signal wire is held on and written into a sampling capacitor. At this time, the signal voltage is held on the sampling capacitor on the basis of a common electrode. As the scanning signal transitions from high level to low level, each of the sampling switch elements turns off and changes into a floating state in which the sampling capacitor is electrically insulated from the signal wire and a driving TFT. As the scanning signal changes from high level to low level, each of the driving switches becomes conductive so that the signal voltage held on the sampling capacitor is applied as it is between the source and gate of the driving TFT as a bias voltage to make the driving TFT conductive, causing an organic LED to emit light.

Description

Background of the invention [0001] The present invention relates to image display devices, and more particularly to light-emitting image display devices suitable for displaying images using current-driven display elements, particularly organic light emitting diodes (LEDs). [0002] An organic electroluminescence (EL) planar image display device is known as one image display device. Such an image display device adopts a driving method using low-temperature polysilicon (thin film transistor) in order to realize a high-illuminance active matrix display, for example, in SID99 Technical Digest, pp. 372-375. In order to adopt this driving method, the image display device adopts a pixel structure in which scanning lines, signal lines, EL power supply lines, and capacitive reference voltage lines cross each other, and has an n-type scanning TFT and a storage capacitor for driving each EL The formed signal voltage holds the circuit. A signal voltage held in the holding circuit is app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50G09F9/30G09G3/20G09G3/22G09G3/30G09G3/32H01L27/32
CPCG09G2300/0861G09G2300/0842G09G2320/0233G09G3/3233G09G2320/0223G09G2320/0261G09G3/3266G09G2300/0426G09G3/30
Inventor 三上佳朗大内贵之秋元肇佐藤敏浩
Owner SAMSUNG DISPLAY CO LTD
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