EL display device and electronic device

• US 7,548,027 B2
• Filed: 08/08/2007
• Issued: 06/16/2009
• 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:
  US11/891,029
• Publication Number:
  US 20080024069A1
• Time in Patent Office: 678 Days
• Field of Search: 3151691-1693, 345/90, 345/92, 345 98-100, 345204-206, 257/59, 257/72, 257/346, 257/347, 257/350, 349/48, 313/506
• 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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, and at least a first flip-flop circuit and a second flip-flop circuit,

wherein each of the first and second pixels comprises;

a thin film transistor; and

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 thin film transistor;

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

wherein at least a portion of each of the first and second flip-flop circuits is covered with the first electrode.

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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, and at least a first flip-flop circuit and a second flip-flop circuit,

wherein each of the first and second pixels comprises;

a data signal line;

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

a thin film transistor; and

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 thin film transistor;

wherein the first flip-flop circuit is electrically connected to the second flip-flop circuit through a connection wiring that extends over the data signal line and the current supply line, and

wherein at least a portion of each of the first and second flip-flop circuits is covered with the first electrode.

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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, and at least a first flip-flop circuit and a second flip-flop circuit,

wherein each of the first and second pixels comprises;

a data signal line;

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

a thin film transistor; and

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 thin film transistor

wherein the first flip-flop circuit is electrically connected to the second flip-flop circuit through a connection wiring that extends under the data signal line and the current supply line, and

wherein at least a portion of each of the first and second flip-flop circuits is covered with the first electrode.

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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, at least a first clocked inverter and a second clocked inverter, and at least a first inverter and a second inverter,

wherein each of the first and second pixels comprises;

a thin film transistor; and

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 thin film transistor,

wherein the first clocked inverter is electrically connected to the second inverter or the second clocked inverter in series, and

wherein at least a portion of each of the first and second clocked inverters and at least a portion of each of the first and second inverters is covered with the first electrode.

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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, at least a first clocked inverter and a second clocked inverter, and at least a first inverter and a second inverter,

wherein each of the first and second pixels comprises;

a data signal line;

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

a thin film transistor; and

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 thin film transistor,

wherein the first clocked inverter is electrically connected to the second inverter or the second clocked inverter through a connection wiring that extends over the data signal line and the current supply line, and

wherein at least a portion of each of the first and second clocked inverters and at least a portion of each of the first and second inverters is covered with the first electrode.

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; and

a pixel portion comprising at least a first pixel and a second pixel formed adjacent to each other over the substrate, at least a first clocked inverter and a second clocked inverter, and at least a first inverter and a second inverter,

wherein each of the first and second pixels comprises;

a data signal line;

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

a thin film transistor; and

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 thin film transistor,

wherein the first clocked inverter is electrically connected to the second inverter or the second clocked inverter through a connection wiring that extends under the data signal line and the current supply line, and

wherein at least a portion of each of the first and second clocked inverters and at least a portion of each of the first and second inverters is covered with the first electrode.

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.