EL display device and electronic device

• US 6,774,573 B2
• Filed: 04/01/2003
• Issued: 08/10/2004
• 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:
  US10/404,247
• Publication Number:
  US 20030214246A1
• Time in Patent Office: 497 Days
• Field of Search: 315/169.3, 315/169.1, 315/169.2, 345/90, 345/98, 313/503, 313/504, 257/346, 257/349, 349/48
• US Class Current: 315/169.2
• 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. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor;

a flip-flop circuit;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a shift register comprising the flip-flop circuits, formed in the pixel portion,

wherein the flip-flop circuit of the first pixel is electrically connected to the flip-flop circuit of the second pixel in series,

wherein a light is emitted to the side opposite to the substrate.

2. An EL display device according to claim 1, wherein the EL display device is incorporated into an electronic device selected from the group consisting of a personal computer, a video camera, a head mount display, an image playback device, and a mobile computer.

3. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a date signal line;

a current supply line extending in parallel with the data signal line;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor;

a flip-flop circuit;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a shift register comprising the flip-flop circuits, formed in the pixel portion,

wherein the flip-flop circuit of the first pixel is electrically connected to the flip-flop circuit of the second pixel through a connection wiring,

wherein the connection wiring extends over the date signal line and the current supply line, and

wherein a light is emitted to the side opposite to the substrate.

4. An EL display device according to claim 3, wherein the EL display device is incorporated into an electronic device 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. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a date signal line;

a current supply line extending in parallel with the data signal line;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor;

a flip-flop circuit;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a shift register comprising the flip-flop circuits, formed in the pixel portion,

wherein the flip-flop circuit of the first pixel is electrically connected to the flip-flop circuit of the second pixel through a connection wiring,

wherein the connection wiring extends under the date signal line and the current supply line, and

wherein a light is emitted to the side opposite to the substrate.

6. An EL display device according to claim 5, wherein the EL display device is incorporated into an electronic device 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. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor,

an inverter;

a clocked inverter;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a circuit comprising the inverter and the clocked inverter, formed in the pixel portion,

wherein the clock inverter of the first pixel is electrically connected to the inverter or clocked inverter of the second pixel in series,

wherein a light is emitted to the side opposite to the substrate.

8. An EL display device according to claim 7, wherein the EL display device is incorporated into an electronic device 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. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a date signal line;

a current supply line extending in parallel with the data signal line;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor;

an inverter;

a clocked inverter;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a circuit comprising the inverter and the clocked inverter, formed in the pixel portion,

wherein the clocked inverter of the first pixel is electrically connected to inverter of the second pixel or the clocked inverter of the second pixel through a connection wiring,

wherein the connection wiring extends over the date signal line and the current supply line, and

wherein a light is emitted to the side opposite to the substrate.

10. An EL display device according to claim 9, wherein the EL display device is incorporated into an electronic device 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. An EL display device comprising:

a substrate;

a pixel portion comprising at least a first pixel and a second pixels formed over the substrate, wherein the first and second pixels are adjacent to each other, each of said first and second pixels comprising;

a date signal line;

a current supply line extending in parallel with the data signal line;

a first thin film transistor;

a second thin film transistor, wherein the second thin film transistors is switched by the first thin film transistor;

an inverter;

a clocked inverter;

an EL element comprising a first electrode, a second electrode, and an EL layer provided between the first and second electrodes, wherein the first electrode is electrically connected to the second thin film transistor,

a circuit comprising the inverter and the clocked inverter, formed in the pixel portion,

wherein the clocked inverter of the first pixel is electrically connected to inverter of the second pixel or the clocked inverter of the second pixel through a connection wiring,

wherein the connection wiring extends under the date signal line and the current supply line, and

wherein a light is emitted to the side opposite to the substrate.

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