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Electroluminescent display device

A display device, electroluminescent technology, applied in the direction of static indicators, electric solid-state devices, semiconductor devices, etc., can solve the problems of increasing display costs, increasing driving capabilities, etc., and achieve the effect of improving time or area ratio technology

Inactive Publication Date: 2005-04-06
TPO DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will increase the required drive capability (otherwise requiring a lower frame rate) and thus increase the cost of the display

Method used

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  • Electroluminescent display device
  • Electroluminescent display device
  • Electroluminescent display device

Examples

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Embodiment Construction

[0030] refer to figure 1 , an active matrix addressed electroluminescent display device comprising a panel having regularly spaced pixels arranged in a matrix of rows and columns, denoted box 1, the panel comprising electroluminescent display elements 2 and associated switching devices, the Switching devices are located at the crossings between row (select) and column (data) address conductors 4 and 6 . For simplicity, only a few pixels are shown in the figure. In practice, there can be hundreds of rows and columns of pixels. The pixel 1 is addressed by a peripheral driver circuit comprising a row (scanning) driver circuit 8 and a column (data) driver circuit 9 connected to the ends of each group of conductors, respectively, via sets of row and column address conductors .

[0031] The electroluminescent display element 2 comprises an organic light emitting diode, here indicated as a diode element (LED), comprising a pair of electrodes between which one or more active layers...

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PUM

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Abstract

An electroluminescent (EL) display device comprises an array of display pixels, each display pixel comprising an EL display element and a driving circuit. A digital pixel drive signal determines whether the pixel is on or off, and a selected one of a plurality of supply voltages is switched to the EL display element. This device enables a digital drive scheme to be implemented, but the provision of a plurality of different supply voltages enables a grey scale to be implemented without requiring time or area ratio systems to be employed. Alternatively, the device of the invention can allow time or area ratio techniques to be improved.

Description

technical field [0001] The invention relates to electroluminescent display devices, for example using organic light emitting diodes such as polymer light emitting diodes. Background technique [0002] Matrix display devices using electroluminescent display elements are well known. These display elements may include, for example, organic thin film electroluminescent elements using polymer materials, or light emitting diodes (LEDs) using conventional III-V semiconductor compounds. Recent developments in organic electroluminescent materials, especially polymeric materials, have demonstrated their practical use in video display devices. These materials typically comprise one or more layers of a semiconducting conjugated polymer sandwiched between a pair of electrodes, one of which is transparent and the other is a material suitable for injecting holes or electrons into the polymer layer. [0003] The polymer material can be produced by CVD, or simply by a spin-coating techniqu...

Claims

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Application Information

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IPC IPC(8): H01L51/50G09G3/20G09G3/30G09G3/32H04N5/70
CPCG09G2300/0828G09G3/3258G09G2300/0842G09G2300/0804G09G3/2081G09G3/2074G09G3/2077G09G3/2011G09G3/2022G09G3/30G09F9/30
Inventor M·J·蔡尔兹
Owner TPO DISPLAY