Organic EL display device and method for production of the same

An electroluminescence display and display device technology, applied in electroluminescence light sources, electric light sources, luminescent materials, etc., can solve the problems of deterioration of device characteristics, reduced uniformity life, increased driving voltage, etc., and improved electron injection efficiency. , the effect of improving the luminous efficiency and increasing the amount of electrons

Active Publication Date: 2012-05-16
JOLED INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the drive voltage to increase
The second problem is lack of uniformity in luminous efficiency for all colors and reduced lifetime (which deteriorates device characteristics)
[0011] However, the organic EL element disclosed in Patent Document 1 has disadvantages of low luminous efficiency and short lifetime due to insufficient electron injection into the light-emitting layer.

Method used

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  • Organic EL display device and method for production of the same
  • Organic EL display device and method for production of the same
  • Organic EL display device and method for production of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0041] 1. First embodiment (organic EL display device in which electron injection / transport layers are formed on light emitting layers of each color)

[0042] 2. Second embodiment (organic EL display device in which a hole blocking layer is formed between each color light emitting layer and an electron injection / transport layer)

no. 1 approach

[0044] figure 1 The structure of the organic EL display device 1 according to the first embodiment of the present invention is shown. The organic EL display device 1 is designed to be used as an organic EL television. It consists of a substrate 11 and a display area 110 formed on the substrate. The display area 110 includes red organic EL elements 10R, green organic EL elements 10G, and blue organic EL elements 10B arranged in a matrix. These organic EL elements will be described in detail later. Along both sides of the display area 110 are provided a signal line driver circuit 120 and a scan line driver circuit 130 serving as drivers for screen display.

[0045] A pixel driving circuit 140 is provided in the display area 110, figure 2 A pixel driver circuit 140 is shown. The pixel driving circuit 140 is an active type driving circuit formed under the lower electrode 14 to be described later. Each pixel driving circuit 140 is composed of a driving transistor Tr1, a writin...

no. 2 approach

[0205] The second embodiment will be described below. The same constituent elements as those of the first embodiment are given the same reference numerals and will not be described again. There are no drawings for showing the overall structure of the organic EL display device according to the second embodiment of the present invention. Like the first embodiment, the organic EL display device according to the second embodiment has a display area composed of red organic EL elements 20R, green organic EL elements 20G, and blue organic EL elements arranged in a matrix on a substrate 11. Element 20B constitutes. A pixel driving circuit is provided in the display area.

[0206] The red organic EL element 20R, the green organic EL element 20G, and the blue organic EL element 20B in the display area constitute a matrix form such that the red organic EL element 20R, the green organic EL element 20G, and the blue organic EL element 20B are adjacent to each other. Combined to form a p...

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Abstract

Disclosed herein is an organic electroluminescence display device including: a substrate; a plurality of lower electrodes formed thereon for each of a plurality of organic electroluminescence elements; a plurality of hole injecting / transporting layers capable of either hole injection or hole transportation which are formed on the lower electrodes for each of the organic electroluminescence elements; a plurality of organic light emitting layers containing a low-molecular weight material which are formed on the hole injecting / transporting layers for each of the organic electroluminescence elements; an electron injecting / transporting layer capable of either electron injection or electron transportation which is formed over the entire surface of the organic light emitting layers; and an upper electrode formed on the electron injecting / transporting layer.

Description

[0001] Cross References to Related Applications [0002] The present application contains subject matter related to Japanese Priority Patent Application JP 2010-249205 filed in the Japan Patent Office on Nov. 5, 2010, the entire content of which is hereby incorporated by reference. technical field [0003] The invention relates to an organic electroluminescence (EL) display device and a manufacturing method thereof, wherein the organic EL display device emits light based on the principle of organic electroluminescence. Background technique [0004] With the accelerated development of the information communication industry, higher-performance next-generation display devices are required. One product expected to meet such demands is a self-luminous organic EL element having a wide viewing angle, high contrast ratio, and short response time. [0005] An organic EL element has a light-emitting layer and other layers formed of a low-molecular material or a polymer material (high...

Claims

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Application Information

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IPC IPC(8): H01L27/32H01L51/52H01L51/54H01L51/56C09K11/06
CPCH05B33/10H01L51/5096H01L51/5012H01L51/0052H01L27/3211H01L51/0059H01L27/3246H01L51/0058H10K59/35H10K59/122H10K85/626H10K85/631H10K85/615H10K50/18H10K50/11H10K50/13
Inventor 松元寿树吉永祯彦
Owner JOLED INC
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