Organic electroluminescent multicolor image display device

• US 5,294,869 A
• Filed: 12/30/1991
• Issued: 03/15/1994
• 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., Littman, Jon E.
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Patel, Ashok
• Application Number:
  US07/814,163
• Time in Patent Office: 806 Days
• Field of Search: 313/489, 313/486, 313/487, 313/500, 313/504, 313/505, 313/506, 313/509, 428/690, 428/917, 340/781, 315/169.3, 315/169.1
• US Class Current: 313/504
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/20 characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

A multicolor image display device includes an array consisting of a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows on a common electrically insulative light transmissive support. The pixels in each file of one of the first or second set of parallel files contain and are joined by a common light transmissive first electrode overlying and laterally spaced on the support; an organic electroluminescent medium overlies the first electrode, and the pixels in each file of the other of the first or second set of parallel files contain and are joined by a laterally spaced common second electrode. The device, which is capable of producing multicolor image display, is further characterized in that each pixel in the first set of parallel files is divided into at least two sub-pixels, the electroluminescent medium in each of the sub-pixels being capable of emitting light of a different hue; parallel walls of a height exceeding the thickness of the electroluminescent medium and capable of shadowing adjacent sub-pixels are positioned between the sub-pixels, and each of the sub-pixels contains and is joined by an element of the first or second electrode.

Claims

1. A multicolor image display device comprised of an array consisting of

a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows on a common electrically insulative light transmissive support,

the pixels in each file of one of said first set or said second set of parallel files containing and being joined by a common light transmissive first electrode means overlying said support,

the first electrode means in adjacent files being laterally spaced on said support,

an organic electroluminescent medium overlying the first electrode means and said support,

the pixels in each file of the other of said first set or said second set of parallel files containing and being joined by a common second electrode means overlying said organic electroluminescent medium, and

the second electrode means in adjacent files being laterally spaced on said organic electroluminescent medium,

characterized in that the device is capable of producing multicolor image display,

each pixel in said first set of parallel files of pixels is divided into at least two sub-pixels,

said organic electroluminescent medium in each pixel in said first set forms at least two areas, each within one sub-pixel of each pixel in said first set and each capable of emitting light of a different hue,

parallel walls are positioned between sub-pixels, said walls being of a height exceeding the thickness of the organic electroluminescent medium and capable of shadowing adjacent sub-pixels, and

in said first set one of said first and second electrode means that is contained in and joins the pixels in each of the files of said first set is divided into at least two laterally spaced electrode elements each joining one sub-pixel of each of the pixels in a file.

2. A multicolor image display device according to claim 1 further characterized in that

the first electrode means are arranged in parallel rows,

each first electrode means joins and forms a part of all of the sub-pixels in a row,

the second electrode means are arranged in parallel columns,

each second electrode means is divided into at least two laterally spaced electrode elements,

a first electrode element of each second electrode means joins and forms a part of one of the sub-pixels of all of the pixels in a column,

a second electrode element of each second electrode means joins and forms a part of a second of the sub-pixels of all of the pixels in the same column, and

a set of parallel walls overlying said first electrode means is positioned between adjacent columns of pixels, said walls being of a height exceeding the thickness of the organic electroluminescent medium and capable of shadowing adjacent sub-pixels.

3. A multicolor image display device according to claim 1 further characterized in that a second set of parallel walls of a height exceeding the thickness of the organic electroluminescent medium but less than that of the walls capable of shadowing adjacent sub-pixels is positioned between adjacent sub-pixels in each pixel of said first set.

4. A multicolor image display device according to claim 1 further characterized in that

the second electrode means are arranged in parallel rows,

each second electrode means joins and forms a part of all of the sub-pixels in a row,

the first electrode means are arranged in parallel columns,

each first electrode means is divided into at least two laterally spaced electrode elements,

a first electrode element of each first electrode means joins and forms a part of one of the sub-pixels of all of the pixels in a column,

a second electrode element of each first electrode means joins and forms a part of a second of the sub-pixels of all of the pixels in the same column, and

the walls are laterally located between adjacent columns of pixels.

5. A multicolor image display device according to claim 4 further characterized in that a second set of parallel walls is provided, each located between adjacent rows of pixels, the walls that are located between adjacent columns of pixels are each laterally spaced from the walls of the second set, and the second electrode means in each row of pixels along one edge of the row overlies one of the walls of the second set and along the opposite edge of the row is laterally spaced from a second of the walls of the second set.

6. A multicolor image display device according to claim 1 further characterized in that the device has a full color display capability, each of the pixels in said first set of parallel files being divided into three sub-pixels, the organic electroluminescent medium in one of the sub-pixels in each pixel capable of emitting blue light, the organic electroluminescent medium in the second of the sub-pixels in each pixel capable of emitting green light, and the organic electroluminescent medium in the third of the sub-pixels in each pixel capable of emitting red light.

7. A multicolor image display device having full color capability according to claim 6 further characterized in that the organic electroluminescent medium capable of emitting blue light is comprised of a bis (8-quinolinolato)(phenolato)aluminum(III) chelate or a bis (8-quinolinolato)aluminum(III)--oxo-bis(8-quinolinolato)aluminum(III) chelate.

8. A multicolor image display device comprised of an array consisting of

a plurality of light emitting pixels arranged in two intersecting sets of parallel files, the pixels in a first set of parallel files forming columns and the pixels in a second set of parallel files forming rows on a common electrically insulative light transmissive support,

the pixels in each file of one of said first set or said second set of parallel files containing and being joined by a common light transmissive first electrode means overlying said support,

the first electrode means in adjacent files being laterally spaced on said support,

an organic electroluminescent medium overlying the first electrode means and said support,

the pixels in each file of the other of said first set or said second set of parallel files containing and being joined by a common second electrode means overlying said organic electroluminescent medium, and

the second electrode means in adjacent files being laterally spaced on said organic electroluminescent medium,

characterized in that the light emitting device is capable of producing full color image display,

each pixel in said first set of parallel files of pixels is divided into three sub-pixels,

said organic electroluminescent medium in each pixel in said first set forms three areas, each within one sub-pixel of each pixel in said first set and each capable of emitting light of a different primary hue,

a set of walls is positioned between adjacent files of pixels and between one of the sub-pixels in each of the pixels in each of the files and the two remaining sub-pixels in each of the pixels in each of the files, the walls each being of a height exceeding the thickness of the organic electroluminescent medium and capable of shadowing adjacent sub-pixels, and

each electrode means of one of said first set or said second set of parallel files being divided into three laterally spaced electrode elements each joining one sub-pixels of each of the pixels in said first set or said second set of parallel files.

9. A multicolor image display device according to claim 8 further characterized in that

the first electrode means are arranged in parallel rows,

each first electrode means joins and forms a part of all of the sub-pixels in a row,

the second electrode means are arranged in parallel columns,

each second electrode means is divided into three laterally spaced electrode elements,

a first electrode element of each second electrode means joins and forms a part of one of the sub-pixels of all of the pixels in a column,

a second electrode element of each second electrode means joins and forms a part of the second of the sub-pixels of all of the pixels in the same column,

a third electrode element of each second electrode means joins and form a part of the third of the sub-pixels of all of the pixels in the same column, and

the walls are positioned between adjacent columns of pixels and between one of the sub-pixels and the two other sub-pixels in each of the pixels in each of the columns, the walls each being of a height exceeding the thickness of the organic electroluminescent medium and capable of shadowing adjacent sub-pixels.

10. A multicolor image display device according to claim 9 further characterized in that a second set of parallel walls of a height exceeding the thickness of the organic electroluminescent medium but less than that of the walls capable of shadowing adjacent sub-pixels is positioned between the two other sub-pixels in each pixel.

11. A multicolor image display device according to claim 8 further characterized in that

the second electrode means are arranged in parallel rows,

each second electrode means joins and forms a part of all of the sub-pixels in a row,

the first electrode means are arranged in parallel columns,

each first electrode means is divided into at least three laterally spaced electrode elements,

a first electrode element of each first electrode means joins and forms a part of one of the sub-pixels of all of the pixels in a column,

a second electrode element of each first electrode means joins and forms a part of the second of the sub-pixels of all of the pixels in the same column,

a third electrode element of each first electrode means joins and forms a part of the third of the sub-pixels of all the pixels in the same column, and

the walls are positioned between adjacent columns of pixels and between one of the sub-pixels and the two other sub-pixels in each of the pixels in each of the columns.

12. A multicolor image display device according to claim 11 further characterized in that a second set of parallel walls is provided, each located between adjacent rows of pixels, the walls that are located between columns are each laterally spaced from the walls of the second set, and the second electrode means in each row of pixels along one edge of the row overlies one of the walls of the second set and along the opposite edge of the row is laterally spaced from a second of the walls of the second set.

13. A multicolor image display device according to claim 8 further characterized in that the device has a full color display capability, each of the pixels in said first set of parallel files being divided into three sub-pixels, the organic electroluminescent medium in one of the sub-pixels in each pixel capable of emitting blue light, the organic electroluminescent medium in the second of the sub-pixels in each pixel, capable of emitting green light, and the organic electroluminescent medium in the third of the sub-pixels in each pixel capable of emitting red light.

14. A multicolor image display device according to claim 13 further characterized in that the organic electroluminescent medium capable of emitting blue light is comprised of a bis(quinolinolato)(phenolato)aluminum(III) chelate or a bis(8-quinolinolato)aluminum--oxo-bis(8-quinolinolato)aluminum(III) chelate.

15. A multicolor image display device according to claim 14 further characterized in that the organic electroluminescent medium capable of emitting green light is comprised of an aluminum trisoxine and the aluminum trisoxine is interposed between the second electrode means and the organic electroluminescent medium capable of emitting blue light.