Organic electroluminescent image display device

• US 5,276,380 A
• Filed: 12/30/1991
• Issued: 01/04/1994
• Est. Priority Date: 12/30/1991
• Status: Expired due to Term

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Tang, Ching W.
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Patel, Ashok
• Application Number:
  US07/814,512
• Time in Patent Office: 736 Days
• Field of Search: 313/500, 313/503, 313/504, 313/505, 313/485, 313/496, 313/494, 313/509, 428/917, 428/690, 340/781
• US Class Current: 313/504
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/805 Electrodes

Abstract

An improvement in a light emitting device having an image display array consisting of a plurality of light emitting pixels arranged in intersecting columns and rows. The pixels are each located on a common electrically insulative light transmissive support with pixels in the same column including a common light transmissive first electrode element located on the support. An organic electroluminescent medium overlies the first electrode elements. The pixels of each row include a common second electrode element located on the organic electroluminescent medium. The light emitting device is fabricated by providing the support with the first electrode elements positioned in laterally spaced columns thereon to form a supporting surface, depositing the organic electroluminescent medium on the supporting surface, and forming the second electrode elements on the surface of the organic electroluminescent medium.

Claims

1. A light emitting device comprised of an image display array consisting of

a plurality of light emitting pixels arranged in intersecting columns and rows,

the pixels each being located on a common electrically insulative light transmissive support,

the pixels in each column containing and being joined by a common light transmissive first electrode element located on the support,

the first electrode element in each column being laterally spaced from an adjacent first electrode element on the support,

an organic electroluminescent medium located on a supporting surface formed by the support and every first electrode element,

the pixels of each row containing and being joined by a common second electrode element located on the organic electroluminescent medium, and

the second electrode element in each row being laterally spaced from an adjacent second electrode element on the organic electroluminescent medium,

characterized in that

walls of a height exceeding the thickness of the organic electroluminescent medium are positioned on said supporting surface between adjacent rows of pixels, and

the second electrode element in each row overlies the organic electroluminescent medium and extends from a location overlying one wall that bounds a row to a location laterally spaced from the second wall that bounds the row.

2. A light emitting device according to claim 1 further characterized in that the walls are electrically insulative and are located on the supporting surface.

3. A light emitting device according to claim 1 further characterized in that an electrically insulative layer underlies and extends laterally beyond each wall.

4. A light emitting device according to claim 3 further characterized in that the insulative layer extends on the supporting surface laterally from each wall to the next adjacent laterally spaced second electrode element.

5. A light emitting device according to claim 3 further characterized in that the walls are each in contact with an overlying portion of a second electrode element.

6. A light emitting device according to claim 1 further characterized in that each first electrode element includes a higher conductance edge portion.

7. A light emitting device comprised of an image display array consisting of

a plurality of light emitting pixels arranged in intersecting columns and rows,

the pixels each being located on a common electrically insulative light transmissive support,

the pixels in each column containing and being joined by a common light transmissive anode located on the support,

the anode in each column being laterally spaced on the support,

the support and every anode together forming a supporting surface,

laterally spaced walls having a height of greater than 1 μ

m located on the supporting surface, each wall overlying each anode, the walls being located between adjacent rows of pixels,

an organic electroluminescent medium having a thickness of less than 1 μ

m located on the supporting surface and overlying the walls,

the pixels of each row containing and being joined by a common cathode located on the organic electroluminescent medium, and

the cathode in each row extending from a location overlying one wall to a location laterally spaced from the second wall that bounds the row.