EL display device and electronic device

• US 7,256,422 B2
• Filed: 08/09/2004
• Issued: 08/14/2007
• Est. Priority Date: 06/28/1999
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei
• Primary Examiner(s): Philogene; Haissa
• Application Number:
  US10/914,350
• Publication Number:
  US 20050006667A1
• Time in Patent Office: 1,100 Days
• Field of Search: 315/169.1, 315/169.2, 315/169.3, 345/90, 345/92, 345/98, 345/100, 257/59, 257/72, 257/347, 257/350, 438/149, 438/161, 438/199, 438/213, 313/505, 313/506
• US Class Current: 257/59
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0857 Static memory circuit, e.g. flip-flop
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/027 Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
• CPC Class Codes: G09G 2320/0223 Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/871 Self-supporting sealing arrangements

Abstract

An electroluminescence display device has a plurality of electroluminescence elements and a driver circuit formed over a substrate. At least a part of the driver circuit is disposed in a display portion of a substrate in order that the size of the display device can be reduced.

Claims

1. A camera comprising:

a display portion;

operation switches;

an image receiving portion,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising a plurality of pixels and each of the plurality of pixels comprising at least one thin film transistor, a pixel electrode connected with the thin film transistor, and a light emitting element formed over the pixel electrode; and

a driver circuit formed among the plurality of pixels,

wherein at least a part of the driver circuit is covered with the pixel electrode.

2. A camera according to claim 1, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

3. A camera comprising:

a display portion;

operation switches;

an image receiving portion,

the display portion comprising;

a pixel portion comprising at least first and second pixels formed over a substrate, each of the first and second pixels comprising a first thin film transistor connected with a pixel electrode, a second thin film transistor located below the pixel electrode, and a light emitting element formed over the pixel electrode,

wherein the driver circuit includes the second thin film transistors of the first and second pixels, and

wherein the driver circuit is formed in the pixel portion.

4. A camera according to claim 3, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

5. A camera comprising:

a display portion;

operation switches;

an image receiving portion,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising at least first and second pixels each of which comprises a light emitting element; and

a driver circuit formed in the pixel portion, the driver circuit comprising at least first and second portions,

wherein the first portion comprises a first thin film transistor and the second portion comprises a second thin film transistor, and

wherein the first thin film transistor is formed in the first pixel and the second thin film transistor is formed in the second pixel.

6. A camera according to claim 5, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

7. A camera according to claim 5, wherein each of the pixels comprises a third thin film transistor connected to the light emitting element.

8. A portable information terminal comprising:

an image receiving portion;

operation switches; and

a display portion,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising a plurality of pixels and each of the plurality of pixels comprising at least one thin film transistor, a pixel electrode connected with the thin film transistor, and a light emitting element formed over the pixel electrode; and

a driver circuit formed among the plurality of pixels,

wherein at least a part of the driver circuit is covered with the pixel electrode.

9. A camera according to claim 8, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

10. A portable information terminal comprising:

an image receiving portion;

operation switches; and

a display portion,

the display portion comprising;

a pixel portion comprising at least first and second pixels formed over a substrate, each of the first and second pixels comprising a first thin film transistor connected with a pixel electrode, a second thin film transistor located below the pixel electrode, and a light emitting element formed over the pixel electrode,

wherein the driver circuit includes the second thin film transistors of the first and second pixels, and

wherein the driver circuit is formed in the pixel portion.

11. A camera according to claim 10, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

12. A portable information terminal comprising:

an image receiving portion;

operation switches; and

a display portion,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising at least first and second pixels each of which comprises a light emitting element; and

a driver circuit formed in the pixel portion, the driver circuit comprising at least first and second portions,

wherein the first portion comprises a first thin film transistor and the second portion comprises a second thin film transistor, and

wherein the first thin film transistor is formed in the first pixel and the second thin film transistor is formed in the second pixel.

13. A camera according to claim 12, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

14. A camera according to claim 12, wherein each of the pixels comprises a third thin film transistor connected to the light emitting element.

15. A computer comprising:

a display portion; and

a keyboard,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising a plurality of pixels and each of the plurality of pixels comprising at least one thin film transistor, a pixel electrode connected with the thin film transistor, and a light emitting element formed over the pixel electrode; and

a driver circuit formed among the plurality of pixels,

wherein at least a part of the driver circuit is covered with the pixel electrode.

16. A camera according to claim 15, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

17. A computer comprising:

a display portion; and

a keyboard,

the display portion comprising;

a pixel portion comprising at least first and second pixels formed over a substrate, each of the first and second pixels comprising a first thin film transistor connected with a pixel electrode, a second thin film transistor located below the pixel electrode, and a light emitting element formed over the pixel electrode,

wherein the driver circuit includes the second thin film transistors of the first and second pixels, and

wherein the driver circuit is formed in the pixel portion.

18. A camera according to claim 17, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

19. A computer comprising:

a display portion; and

a keyboard,

the display portion comprising;

a pixel portion formed over a substrate, the pixel portion comprising at least first and second pixels each of which comprises a light emitting element; and

a driver circuit formed in the pixel portion, the driver circuit comprising at least first and second portions,

wherein the first portion comprises a first thin film transistor and the second portion comprises a second thin film transistor, and

wherein the first thin film transistor is formed in the first pixel and the second thin film transistor is formed in the second pixel.

20. A camera according to claim 19, wherein the driver circuit is one selected from the group consisting of a shift register, a level shifter, a buffer, a latch, a D/A converter, a sampling circuit, a wave divider circuit, a booster circuit, a γ

compensation circuit, a memory, and a differential amplifier circuit.

21. A camera according to claim 19, wherein each of the pixels comprises a third thin film transistor connected to the light emitting element.