EL display device and a method of manufacturing the same

• US 8,319,224 B2
• Filed: 10/01/2008
• Issued: 11/27/2012
• Est. Priority Date: 10/12/1999
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Yamamoto, Kunitaka, Hiroki, Masaaki, Fukunaga, Takeshi
• Primary Examiner(s): MENZ, LAURA MARY
• Application Number:
  US12/243,570
• Publication Number:
  US 20090109143A1
• Time in Patent Office: 1,518 Days
• Field of Search: 257/70, 257/59, 345/76
• US Class Current: 257/70
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 71/12 using liquid deposition, e.g. spin coating
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 71/851 Division of substrate

Abstract

To provide a high throughput film deposition means for film depositing an organic EL material made of polymer accurately and without any positional shift. A pixel portion is divided into a plurality of pixel rows by a bank, and a head portion of a thin film deposition apparatus is scanned along a pixel row to thereby simultaneously apply a red light emitting layer application liquid, a green light emitting layer application liquid, and a blue light emitting layer application liquid in stripe shapes. Heat treatment is then performed to thereby form light emitting layers luminescing each of the colors red, green, and blue.

Claims

1. An EL display device comprising:

a pixel portion over a substrate;

a plurality of first banks in rows and a plurality of second banks in columns which partition the pixel portion in matrix;

a first pixel and a second pixel provided in a region partitioned by one of the plurality of first banks, a bank adjacent to the one of the plurality of first banks, one of the plurality of second banks, and a bank adjacent to the one of the plurality of second banks, wherein each of the first pixel and the second pixel comprises an EL element including a first electrode, an EL layer over the first electrode, and a second electrode over the EL layer;

a first current control transistor electrically connected to the EL element of the first pixel; and

a second current control transistor electrically connected to the EL element of the second pixel.

3. The EL display device according to claim 1,

wherein the plurality of first banks and the plurality of second banks comprise a resin material.

5. The EL display device according to claim 1,

wherein the region has a square shape.

7. The EL display device according to claim 1,

wherein the EL layer of the first pixel and the EL layer of the second pixel are connected to each other.

9. The EL display device according to claim 1,

wherein the second electrode of the first pixel and the second electrode of the second pixel are connected to each other.

2. An EL display device comprising:

a pixel portion over a substrate;

a driver circuit provided around the pixel portion over the substrate;

a bank comprising a plurality of first banks in rows and a plurality of second banks in columns and partitioning the pixel portion in matrix;

a first pixel and a second pixel provided at a region partitioned by one of the plurality of first banks, a bank adjacent to the one of the plurality of first banks, one of the plurality of second banks and a bank adjacent to the one of the plurality of second banks, wherein each of the first pixel and the second pixel comprises an EL element including a first electrode, an EL layer over the first electrode and a second electrode over the EL layer;

a first current control transistor electrically connected to the EL element of the first pixel; and

a second current control transistor electrically connected to the EL element of the second pixel.

4. The EL display device according to claim 2,

wherein the bank comprises a resin material.

6. The EL display device according to claim 2,

wherein the region has a square shape.

8. The EL display device according to claim 2,

wherein the EL layer of the first pixel and the EL layer of the second pixel are connected to each other.

10. The EL display device according to claim 2,

wherein the second electrode of the first pixel and the second electrode of the second pixel are connected to each other.