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Drive circuit for electroluminescence display screen

A circuit and display device technology, which is applied in the direction of electroluminescent light source, circuit, electric lamp circuit layout, etc., can solve the problem that it is impossible to display images, etc.

Inactive Publication Date: 2007-06-20
JAPAN DISPLAY CENTRAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn causes variations in the layered output current from the output, making it impossible to display images normally

Method used

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  • Drive circuit for electroluminescence display screen
  • Drive circuit for electroluminescence display screen
  • Drive circuit for electroluminescence display screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0461] Some parts of the drawings herein are omitted and / or enlarged / reduced for ease of understanding and / or description. For example, in the cross-sectional view of the display screen shown in FIG. 11, the thin packaging film 111 and the like are shown as being quite thick. On the other hand, in FIG. 10, the package cover 85 is shown as being thin. Some parts are omitted. For example, although the display screen according to the present invention requires a phase film like a circular polarizer to prevent reflection, such a phase film is omitted in the drawings herein. This also applies to the following figures. In addition, the same or similar forms, materials, functional elements, or operations are indicated by the same symbols or letters.

[0462] Incidentally, the description made with reference to the drawings and the like can be combined with other examples and the like even if not specifically noted. For example, a touch screen or the like may be attached to the di...

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PUM

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Abstract

A source driver circuit of EL display panel is provided in which variation of output current is suppressed. The source driver circuit comprises unit transistors 634 each representing one unit. The 0-th bit comprises one unit transistor 634, the first bit comprises two unit transistors 634, the second bit comprises four unit transistors 634, the third bit comprises eight unit transistors 634, the fourth bit comprises sixteen unit transistors 634, and the fifth bit comprises thirty two unit transistors 634. Each unit transistor 634 constitutes a current mirror circuit in conjunction with a transistor 633a. The current flowing through the unit transistor 634 can be altered by regulating a current Ib flowing through the transistor 633a. When an output current circuit is constituted of unit transistors and the reference current is regulated, output current of the unit transistor can be regulated resulting in a highly accurate source driver IC in which variation of output current is suppressed.

Description

[0001] This application is submitted by the applicant on March 5, 2003, and the application number is "03815105.7 (PCT / JP03 / 02535)", and the invention name is "drive circuit for electroluminescent display screen". Divisional application. technical field [0002] The present invention relates not only to a driving circuit (IC) for a display screen, but also to a light-emitting display screen such as an EL display screen using organic or inorganic electroluminescence (EL) elements. In addition, it also relates to an information display device and similar devices using the EL display screen, a driving method for the EL display screen, and a driving circuit for the EL display screen. Background technique [0003] Generally, an active matrix display device displays images by arranging a large number of pixels in a matrix, and controlling the light intensity of each pixel according to a video signal. For example, if a liquid crystal is used as an electrochemical substrate, the tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/30G09G3/20H05B33/08H05B33/14H05B37/02H01L51/50H01L27/32G09F9/33G09G3/3225H05B44/00
CPCY02B20/325
Inventor 高原博司柘植仁志
Owner JAPAN DISPLAY CENTRAL CO LTD