Display apparatus

• US 7,460,094 B2
• Filed: 06/10/2003
• Issued: 12/02/2008
• Est. Priority Date: 07/02/1997
• Status: Expired due to Term

• Current Assignee: Intellectual Keystone Technology LLC
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Ozawa, Tokuroh
• Primary Examiner(s): Lefkowitz; Sumati
• Assistant Examiner(s): Xiao; Ke
• Application Number:
  US10/457,446
• Publication Number:
  US 20030193493A1
• Time in Patent Office: 2,002 Days
• Field of Search: 345 70- 83, 345204-206, 315/169.3, 315/169.1, 257/40, 257/59, 257/72, 349 44- 48
• US Class Current: 345/82
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2310/0254 Control of polarity reversal in general, other than for liquid crystal displays
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/88 Dummy elements, i.e. elements having non-functional features

Abstract

A display apparatus is provided which is capable of improving display quality by expanding the light-emission area of pixels by improving the layout of pixels and common power-feed lines formed on a substrate. Pixels including a light-emission element, such as an electroluminescence element or an LED element, are arranged on both sides of common power-feed lines so that the number of common power-feed lines is reduced. Further, the polarity of a driving current flowing between the pixels and the light-emission element is inverted so that the amount of current flowing through the common power-supply lines is reduced.

Claims

1. A display apparatus comprising:

a plurality of scanning lines;

a plurality of data lines;

a plurality of power-feed lines; and

a plurality of pixels formed in a display section, the plurality of pixels being formed corresponding to intersections of the plurality of scanning lines and the plurality of data lines, each pixel of the plurality of pixels comprising a first transistor, a second transistor, and a light-emission element having a pixel electrode and a counter electrode,

the first transistor being controlled by one scanning line of the plurality of scanning lines,

a gate electrode of the second transistor being at a potential corresponding to a signal supplied from one data line of the plurality of data lines through the first transistor, and

the light-emission element emitting a light when a current flows between the counter electrode and one power-feed line of the plurality of power-feed lines through the pixel electrode,

a line width of a portion of the one power-feed line being set to be wider than that of a portion of the one scanning line, and

the plurality of data lines being covered with a bank layer.

2. The display apparatus according to claim 1,

the light-emission element having an organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping the one power-feed line.

3. The display apparatus according to claim 1

the light-emission element having an organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping the one data line.

4. The display apparatus according to claim 1,

the light-emission element having an organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping a part of the one scanning line.

5. A display apparatus comprising:

a plurality of scanning lines;

a plurality of data lines;

a plurality of power-feed lines; and

a plurality of pixels formed in a display section, the plurality of pixels being formed corresponding to intersections of the plurality of scanning lines and the plurality of data lines, each pixel of the plurality of pixels comprising;

a first transistor having a first gate electrode connected to one scanning line of the plurality of scanning lines;

a holding capacitor that holds a signal from one data line of the plurality of data lines;

a second transistor having a second gate electrode connected to the holding capacitor; and

a light-emission element having an organic semiconductor film which emits a light by a driving current that flows between a pixel electrode and a counter electrode when the pixel electrode is electrically connected to one power-feed line of the plurality of power-feed lines;

a line width of a portion of the one power-feed line being set to be wider than that of a portion of the one scanning line, and

the plurality of data lines being covered with a bank layer.

6. The display apparatus according to claim 5,

the organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping the one power-feed line.

7. The display apparatus according to claim 5,

the organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping the one data line.

8. The display apparatus according to claim 5,

the organic semiconductor film surrounded by the bank layer, and

at least a part of the bank layer overlapping a part of the one scanning line.

9. A display apparatus comprising:

a plurality of scanning lines;

a plurality of data lines;

a plurality of power-feed lines; and

a plurality of pixels formed in a display section, the plurality of pixels being formed corresponding to intersections of the plurality of scanning lines and a plurality of data lines, each pixel of the plurality of pixels comprising a first transistor, a second transistor and a light-emission element having a pixel electrode and a counter electrode,

the first transistor being controlled by one scanning line of the plurality of scanning lines,

a gate electrode of the second transistor being at a potential corresponding to a signal supplied from one data line of the plurality of data lines through the first transistor, and

the light-emission element emitting a light when a current flows between the counter electrode and one power-feed line of the plurality of power-feed lines through the pixel electrode and the second transistor,

the line width of a portion of the power-feed line being set to be wider than that of a portion of the one scanning line and that of a portion of the one data line, and

the plurality of data lines being covered with a bank layer.

10. A display apparatus comprising:

a plurality of scanning lines;

a plurality of data lines;

a plurality of power-feed lines; and

a plurality of pixels formed in a display section, the plurality of pixels being formed corresponding to intersections of the plurality of scanning lines and the plurality of data lines, each pixel of the plurality of pixels comprising a first transistor, a second transistor and a light-emission element having a pixel electrode and a counter electrode,

the plurality of scanning lines, the plurality of data lines, and the plurality of power-feed lines being covered by an interlayer insulating film,

the first transistor being controlled by one scanning line of the plurality of scanning lines,

a gate electrode of the second transistor being at a potential corresponding to a signal supplied from one data line of the plurality of data lines through the first transistor,

the first transistor and the second transistor being covered by the interlayer insulating film,

the light-emission element emitting a light when a current flows between the counter electrode and one power-feed line of the plurality of power-feed lines through the pixel electrode and the second transistor,

a line width of a portion of the one power-feed line being set to be wider than that of a portion of the one scanning line, and

the light-emission element having an organic semiconductor film surrounded by a bank layer formed on the interlayer insulating film.

11. The display apparatus according to claim 10,

at least a part of the bank layer overlapping the one data line.

12. The display apparatus according to claim 10,

at least a part of the bank layer overlapping a part of the one scanning line.

13. The display apparatus according to claim 10,

at least a part of the bank layer overlapping the one power-feed line.