Organic lighting display device

Abstract

An organic electroluminescent display device includes organic electroluminescent films, each containing organic electroluminescent materials and sandwiched by a pair of electrodes, each forming a plurality of light-emitting elements above a substrate. Each pixel of the display device is composed of two different colors light-emitting elements, and the chromaticity of each color is controlled by changing the concentration of organic electroluminescent materials or by adding foreign materials thereto. For example, if the chromaticity of the red light-emitting element is set to a value shifted toward green side ER1, various colors including white can be produced by mixing this red with blue EB3 of the blue B light-emitting element. Then, the organic electroluminescent display device can produce high-quality quasi-color images by mixing two colors of which chromaticity values are properly controlled. By virtue of a two-color structure, the aperture ratio becomes high and the manufacturing process becomes simple.

Description

technical field [0001] The present invention relates to an organic light-emitting display device, in particular to an organic light-emitting display device made of a light-emitting functional film containing organic light-emitting materials. Background technique [0002] Conventionally, it is known that a display device (abbreviated as an organic EL display device) is fabricated using an electroluminescent element (hereinafter abbreviated as EL) of an organic compound material that emits light by injecting a current. This display device uses organic EL display elements made of thin films of organic EL materials as display units, and these display units are arranged on a flat substrate to display a certain pattern. [0003] The organic light-emitting display device is representative of this kind of organic EL display device. Through the research on organic compounds, according to the development of materials that exhibit various luminous colors of R, G, and B with high color ...

AI Technical Summary

Problems solved by technology

[0007] However, in the device disclosed in the former prior art, the organic light-emitting display device of the display unit is formed by forming the light-emitting part with three-color light-emitting elements. The non-light-emitting part is composed, so there is a problem that the ratio (aperture ratio) of the light-emitting part area to the unit pixel area is low

In addition, since the three-color light-emitting elements are formed on the substrate, it is necessary to form each color independently, so manufacturing is difficult

[0008] For the above-mentioned problems, the above-mentioned problems can be solved by forming a display unit with a light-emitting part composed of a single light-emitting element. However, in this way, only monochromatic shade distribution images can be obtained, and high-expressive color cannot be obtained. image

[0009] In addition, as in the latter prior art, which uses LEDs as light-emitting elements, since the chromaticity of the luminous color cannot be clearly set, the range of chromaticity obtained through color mixing is also very limited, so it is impossible to obtain a color that requires more expressiveness. High two-color color display

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