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Organic electroluminescence display device

a display device and electroluminescence technology, applied in the field of organic electroluminescence display devices, can solve the problems of reduced reflected external light, reduced light emitted by the device, so as to achieve enhanced contrast of display devices, low cost, and enhanced contrast ratio

Inactive Publication Date: 2006-06-01
CHANG YIH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The selective light valve effectively reduces external light reflection and enhances the contrast ratio and brightness discrimination of the organic electroluminescence display device, especially under strong light conditions, improving its outdoor usability and display quality.

Problems solved by technology

However, these two methods have the disadvantages below.
First, the reflected external light is reduced by the polarizer, however, the light emitted by the device is also reduced by the polarizer, therefore the contrast of the display device is not enhanced and is not applicable for the display device to be used outdoors.
Next, the photo sensor and the adjusting device of the contrast ratio are dependent on the intensity of the external light, thus the cost is high.

Method used

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  • Organic electroluminescence display device
  • Organic electroluminescence display device
  • Organic electroluminescence display device

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Embodiment Construction

[0031] The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.

[0032]FIG. 2 is a drawing schematically illustrating an organic electroluminescence display device according to one embodiment of the present invention. Referring to FIG. 2, the organic electroluminescence display device comprises, for example but not limited to, a substrate 200, a first electrode layer 202, an organic functional layer 204, a second electrode layer 206 and an electrochromic medium layer 208. The substrate 200 comprises, for example but n...

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Abstract

An organic electroluminescence display device is provided. The OEL device includes a substrate, a first electrode layer, a second electrode layer, an organic functional layer and at least one electrochromic medium layer. The first electrode layer is disposed on the substrate, the second electrode layer is disposed over the first electrode layer, and the organic functional layer and the electrochromic medium layer are disposed between the first electrode layer and the second electrode layer. Accordingly, the electrochromic medium layer is provided as a selective light valve to improve the reflection of the external light, and thus the contrast ratio of the organic electroluminescence display device is enhanced.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the priority benefit of Taiwan application serial no. 92107664, filed on Mar. 31, 2003. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to an organic electroluminescence (OEL) display device. More particularly, the present invention relates to organic electroluminescence display device having selective light valve. [0004] 2. Description of Related Art [0005] In recent years, communication appliance has become more and more important. Especially, portable communication appliance is the major stream of the communication appliance. In the development of the portable communication appliance, the flat panel display (FPD) used for the communication interface between the user and the appliance is important. The conventional flat panel display (FPD) may be generally classified into plasma display panel (PDP), liquid crystal display (LCD), inorganic electro-lumine...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01J1/62H01J63/04H05B33/00H05B33/12H05B33/22H10K99/00
CPCH01L51/0037H01L51/0077H01L51/5281H01L51/0084H01L51/0086H01L51/0078G02F1/157H10K85/1135H10K85/311H10K85/30H10K85/341H10K85/344H10K59/8791H10K50/86
Inventor CHANG, YIHLU, TIEN-RONG
Owner CHANG YIH