EL display device and electronic device

• US 6,552,496 B2
• Filed: 02/20/2002
• Issued: 04/22/2003
• Est. Priority Date: 06/28/1999
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei
• Primary Examiner(s): Philogene, Haissa
• Application Number:
  US10/079,109
• Publication Number:
  US 20020093290A1
• Time in Patent Office: 426 Days
• Field of Search: 315/169.3, 315/169.1, 315/169.2, 313/503, 313/504, 345/90, 345/98, 257/346, 257/349, 349/48
• US Class Current: 315/169.3
• 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 light emitting device comprising:

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor comprising a pair of first impurity regions, a channel region between the pair of first impurity regions, a pair of second impurity regions between the first impurity region and the channel region, and a gate electrode over the channel region wherein the gate electrode is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels, the second thin film transistor comprising a pair of third impurity regions, a channel region between the pair of third impurity regions, a fourth impurity region between one of the third impurity region and the channel region wherein the other one of the third impurity region is contiguous to the channel region, and a gate electrode over the channel region;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising a third thin film transistor over the substrate; and

a signal processing circuit comprising a fourth thin film transistor over the substrate.

2. A light emitting device according to claim 1, wherein the one of the third impurity region is electrically connected to the electroluminescence element.

3. An electronic appliance comprising the light emitting device according to claim 1, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

5. A light emitting device according to claim 1, wherein the one of the third impurity region is electrically connected to the electroluminescence element.

4. A light emitting device comprising:

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor comprising a pair of first impurity regions, a channel region between the pair of first impurity regions, a pair of second impurity regions between the first impurity region and the channel region, and a gate electrode over the channel region wherein the gate electrode is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels, the second thin film transistor comprising a pair of third impurity regions, a channel region between the pair of third impurity regions, a fourth impurity region between one of the third impurity region and the channel region wherein the other one of the third impurity region is contiguous to the channel region, and a gate electrode over the channel region;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising a third thin film transistor over the substrate; and

a signal processing circuit comprising a fourth thin film transistor over the substrate,

wherein the pair of second impurity regions are not overlapped with the gate electrode, and

wherein the fourth impurity region is overlapped with the gate electrode at least partly.

6. An electronic appliance comprising the light emitting device according to claim 4, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

7. A light emitting device comprising:

at least two channel regions

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor having at least two gate electrodes wherein each of the gate electrodes is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising third thin film transistor over the substrate; and

a wave divider circuit comprising a fourth thin film transistor over the substrate.

8. An electronic appliance comprising the light emitting device according to claim 7, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

9. A light emitting device comprising:

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings

and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor having at least two gate electrodes wherein each of the gate electrodes is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising third thin film transistor over the substrate; and

a booster circuit comprising a fourth thin film transistor over the substrate.

10. An electronic appliance comprising the light emitting device according to claim 9, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

11. A light emitting device comprising:

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor having at least two gate electrodes wherein each of the gate electrodes is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising third thin film transistor over the substrate; and

a γ

compensation circuit comprising a fourth thin film transistor over the substrate.

12. An electronic appliance comprising the light emitting device according to claim 11, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

13. A light emitting device comprising:

a substrate;

a plurality of gate wirings which extend in parallel with each other in one direction over the substrate;

a plurality of data wirings which extend in parallel with each other in other one direction over the substrate wherein the plurality of data wirings intersect with the plurality of gate wirings and each of a plurality of pixels is defined by the plurality of data wirings and the plurality of gate wirings;

at least a first thin film transistor provided at respective pixels, the first thin film transistor having at least two gate electrodes wherein each of the gate electrodes is electrically connected to the corresponding gate wiring;

at least a second thin film transistor provided at respective pixels;

an interlayer insulating film over the first and second thin film transistors;

an electroluminescence element over the interlayer insulating film wherein the second thin film transistor is electrically connected to the electroluminescence element;

a driver circuit comprising third thin film transistor over the substrate; and

a memory comprising a fourth thin film transistor over the substrate.

14. An electronic appliance comprising the light emitting device according to claim 13, wherein the electronic appliance is selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.