Electroluminescence display device

• US 6,674,244 B2
• Filed: 10/08/2002
• Issued: 01/06/2004
• Est. Priority Date: 03/11/1999
• Status: Expired due to Fees

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Segawa, Yasuo
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Vu, Jimmy T.
• Application Number:
  US10/267,319
• Publication Number:
  US 20030057862A1
• Time in Patent Office: 455 Days
• Field of Search: 315/169.1, 315/169.3, 315/169.2, 313/129, 313/137, 313/309, 313/504, 313/506, 313/495, 313/496, 345/76, 345/92
• US Class Current: 315/169.3
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices

Abstract

In an organic EL display device including a TFT (40) and an organic EL element (60) formed on an insulating substrate (10) of a glass substrate, insulating films, namely, a planarization insulating film (17), an interlayer insulating film (15), and a gate insulating film (12), for forming the TFT (40) are not provided at a region for forming the organic EL element (60). Instead, an opening (65) formed by removing these insulating films is provided to expose the glass substrate (10), and at this exposed region an anode (61), an emissive element layer (62), and a cathode (63) are formed in this order. Consequently, light emitted from the emissive element layer (62) is prevented from reflecting at interfaces between these insulating films (12, 15, and 17), and efficiently exits from the glass substrate (10) side.

Claims

1. A light emissive display device, comprising, for each pixel:

an emissive element composed of a first electrode of a transparent, electrically conductive material;

an emissive element layer; and

a second electrode of an opaque, electrically conductive material, formed in this order; and

a switching element for driving said emissive element;

wherein

at least part of said first electrode of said emissive element is formed in direct contact with a surface of a transparent substrate.

2. The device according to claim 1, wherein said first electrode includes indium tin oxide.

3. A light emissive display device, comprising, for each pixel:

an emissive element composed of a first electrode of a transparent, electrically conductive material;

an emissive element layer; and

a second electrode of an opaque, electrically conductive material, formed in this order; and

a switching element for driving said emissive element;

wherein

at least part of said first electrode of said emissive element is formed in direct contact with a surface of a transparent substrate, and wherein said first electrode includes indium tin oxide.

4. The device according to claim 3, wherein said emissive element is an electroluminescence element.

5. The device according to claim 3, wherein said emissive element is an organic electroluminescence element including said emissive element layer of an organic compound.

6. The device according to claim 3, wherein light emitted from said emissive element passes through said first electrode and said transparent substrate.

7. A light emissive display device, comprising, for each pixel:

an emissive element composed of a first electrode of a transparent, electrically conductive material;

art emissive element layer; and

a second electrode of an opaque, electrically conductive material, formed in this order; and

a switching element for driving said emissive element;

wherein

said first electrode of said emissive element is an individual electrode separately formed for each pixel, at least part of said first electrode being formed in direct contact with a surface of a transparent substrate.

8. The device according to claim 7, wherein said first electrode includes indium tin oxide.