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Organic electroluminescent display device

A technology of electroluminescent display and electroluminescent materials, which is applied in the direction of electroluminescent light sources, electric light sources, circuits, etc., and can solve problems such as differences in brightness and current density

Inactive Publication Date: 2004-07-07
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When passing the same current through LEDs with different surface areas, the difference in surface area results in a difference in current density and thus in brightness

Method used

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  • Organic electroluminescent display device
  • Organic electroluminescent display device
  • Organic electroluminescent display device

Examples

Experimental program
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Embodiment Construction

[0026] figure 1 A display device 1 is shown with an active layer 50 between the two modes of electrode layers 2, 3 of conductive material. In this example, the electrode 2 and the electrode 3 and the active material in the middle position are defined as a light emitting diode (LED) 4, which is also called a pixel. At least one of the electrode patterns is transparent to the light emitted in the active layer. During operation, the electrode 2 is driven in such a way. With respect to the electrode 3, they have a sufficient positive voltage for injecting holes into the active layer. The materials of these electrodes 2 have high working functions, and are usually composed of indium oxide or indium-tin oxide (ITO) layers. ITO is particularly suitable due to its satisfactory conductivity and high transparency. Electrode 3 serves as a negative electrode (as opposed to electrode 2) for injecting electrons into the active layer. In this example, the material used for this layer is alumin...

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Abstract

Electroluminescent display device comprising drive circuitry (a number of alternatives is given) to determine the surface area of a pixel (via capacitance, reverse current) and adjust the current density in the pixel accordingly.

Description

Technical field [0001] The present invention relates to an electroluminescent display device, comprising an electroluminescent material layer with an active layer of organic material, the layer appears between the first and second electrode patterns, these patterns define different surface areas For pixels, at least one of the two modes is transparent to light emitted through the active layer, and the first mode includes a material suitable for injecting carriers with a bias current for emission. The display device includes It is a driving device that adjusts the bias current of the pixel. Background technique [0002] Electroluminescence (EL) display devices can be used, for example, in displays and indicator lights. An ever-increasing number of organic materials, for example, semiconducting organic polymers are used for the active layer in such structures. This increases the number of possible materials used in these types of display devices. The active layer and the two electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B44/00G09G3/00G09G3/20G09G3/30G09G3/3216G09G3/3283H01L51/50
CPCG09G2320/02G09G2320/0233G09G2320/0285G09G3/3216G09G2310/0248G09G3/3283
Inventor J·范韦尔津C·T·H·F·利登鲍姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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