Method of manufacturing electroluminescent display device

a technology of electroluminescent display device and manufacturing method, which is applied in the direction of electroluminescent light source, discharge tube luminescnet screen, organic semiconductor device, etc., can solve the problems of poor production yield of el display device, and achieve the effect of preventing moisture penetration

Inactive Publication Date: 2005-10-13
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The protection film effectively reduces dark spot formation and enhances the production yield by preventing moisture ingress, even when defects are present in the cathode, maintaining display functionality and reducing manufacturing defects.

Problems solved by technology

However, the cathode, which is formed on the light emitting layer, is known to be prone to defect formation, leading to a poor production yield of the EL display device.

Method used

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  • Method of manufacturing electroluminescent display device
  • Method of manufacturing electroluminescent display device
  • Method of manufacturing electroluminescent display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] An embodiment of this invention will be described with reference to FIGS. 1-7B.

[0018]FIG. 1 is a plan view of one of the display pixels of an organic EL display device of this embodiment. FIG. 2 is an equivalent circuit diagram of the display pixel of FIG. 1. As shown in FIG. 2, the display pixels of the same configuration shown in FIG. 1 are arranged in a matrix to form the device. FIG. 3A is a sectional view along line A-A in FIG. 1, and FIG. 3B is a sectional view along line B-B in FIG. 1.

[0019] As shown in FIGS. 1 and 2, a display pixel is formed in a region surrounded by gate signal lines 51 and drain signal lines 52. A switching TFT 30, which is a switching element, is located near an intersection of the signal lines, and a source 13s of this TFT 30 serves at the same time as a capacitor electrode 55 that forms a capacitor 70 in combination with a holding capacitor electrode 54 and is connected to a gate electrode 41 of a driving TFT 40 that drives an organic EL eleme...

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PUM

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Abstract

An electroluminescent display device includes a transparent substrate and an electroluminescent element disposed over the substrate. The electroluminescent element has a first electrode disposed over the substrate, a second electrode disposed over the first electrode and a light emitting layer disposed between the first and second electrodes. The display device also includes a thin film transistor driving the electroluminescent element, and a protection film disposed over the second electrode and being configured to prevent a penetration of moisture into the electroluminescent element. The second electrode is formed by evaporating aluminum so that the light emitting layer receives no damage, and the protection film is deposited by sputtering to provide a film with a high relative density so that moisture is prevented from entering the electroluminescent element.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to an electroluminescent (EL) display device, specifically to an EL display device free from processing flaws. [0003] 2. Description of the Prior Arts [0004] In recent years, EL display devices using EL elements have come to be known as display devices that can replace CRT and LCD. Research and development have been carried out on active matrix type EL display devices that include thin film transistors (TFT) as switching elements for driving EL elements. The EL element includes an anode, a cathode and a light emitting layer disposed between the anode and cathode. However, the cathode, which is formed on the light emitting layer, is known to be prone to defect formation, leading to a poor production yield of the EL display device. SUMMARY OF THE INVENTION [0005] The invention provides an electroluminescent display device including a substrate and an electroluminescent element disposed over the ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H01J63/04H05B33/04H05B33/12H01L21/84H01L31/036H01L51/52H05B33/10H01J1/62
CPCH01L51/5231H01L2251/558H01L51/5253H10K2102/351H10K59/873H05B33/26H10K50/844H10K50/826
InventorHISHIDA, MITSUOKI
OwnerSANYO ELECTRIC CO LTD