Semiconductor device and display device

• US 8,259,463 B2
• Filed: 04/22/2010
• Issued: 09/04/2012
• Est. Priority Date: 04/28/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime, Yamazaki, Shunpei
• Primary Examiner(s): Dinh, Tuan T
• Application Number:
  US12/765,084
• Publication Number:
  US 20100201661A1
• Time in Patent Office: 866 Days
• Field of Search: 361/767, 361780-784, 174254-255, 349149-151
• US Class Current: 361/767
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/1341 Filling or closing of cells
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/08 Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: H01L 27/1222 : with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 2924/00 : Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 : Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 1/0263 : High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board H05K1/0293 takes precedence
• CPC Class Codes: H05K 1/0265 : characterized by the lay-out of or details of the printed conductors, e.g. reinforced conductors, redundant conductors, conductors having different cross-sections
• CPC Class Codes: H05K 1/117 : Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
• CPC Class Codes: H05K 1/148 : Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means
• CPC Class Codes: H05K 2201/094 : Array of pads or lands differing from one another, e.g. in size, pitch or thickness; Using different connections on the pads
• CPC Class Codes: H05K 2201/09727 : Varying width along a single conductor; Conductors or pads having different widths
• CPC Class Codes: H05K 2201/10136 : Liquid Crystal display [LCD]
• CPC Class Codes: H05K 2201/10166 : Transistor
• CPC Class Codes: H05K 3/361 : Assembling flexible printed circuits with other printed circuits

Abstract

If misalignment in a line width direction of an electrode (pad) of a connection terminal is caused in attachment of a substrate and an FPC, a connection area of the FPC terminal and the connection terminal becomes smaller and contact resistance is increased. In particular, an increase in contact resistance of the connection terminal to which a power supply potential serving as a power source is inputted is a cause of defective display. In view of the above, an object of the present invention is to decrease the resistance of a power supply line, to suppress a voltage drop in the power supply line, and to prevent defective display. A connection terminal portion includes a plurality of connection terminals. The plurality of connection terminals is provided with a plurality of connection pads which is part of the connection terminal. The plurality of connection pads includes a first connection pad and a second connection pad having a line width different from that of the first connection pad. Pitches between the plurality of connection pads are equal to each other.

Claims

1. A display device comprising:

a pixel portion including a plurality of transistors, wherein each of the plurality of transistors contains In, Zn and O in a channel formation region;

a driver circuit portion; and

a connection terminal portion, wherein the connection terminal portion includes a plurality of connection terminals,

wherein the plurality of connection terminals is provided with a plurality of connection pads, each of which is part of the connection terminal portion,

wherein the plurality of connection pads include a first connection pad and a second connection pad having a line width different from that of the first connection pad,

wherein a first wire extends from the first connection pad, and

wherein a plurality of second wire extend from the second connection pad.

2. A display device according to claim 1, wherein a flexible printed circuit is connected to the connection terminal portion.

3. A display device according to claim 1, wherein the display device is incorporated in at least one selected from the group consisting of a camera, a computer, a mobile computer, a goggle type display, a video camera, an image reproducing device, and a mobile phone.

4. A display device according to claim 1, wherein the each of the plurality of transistors further contains Ga in the channel formation region.

5. A display device according to claim 1, wherein the first connection pad and the second connection pad are provided outside a sealing region.

6. A display device according to claim 2, wherein at least one connection terminal in the connection terminal portion is connected to a plurality of terminals of the flexible printed circuit, and a contact resistance between the connection terminal and the plurality of terminals of the flexible printed circuit is 5 Ω

or less.

7. A display device comprising:

a pixel portion including a plurality of transistors, wherein each of the plurality of transistors contains In, Zn and O in a channel formation region;

a driver circuit portion; and

a connection terminal portion, wherein the connection terminal portion includes a plurality of connection terminals,

wherein the plurality of connection terminals is provided with a plurality of connection pads, each of which is part of the connection terminal portion,

wherein the plurality of connection pads include a first connection pad and a second connection pad having a line width different from that of the first connection pad,

wherein pitches between the plurality of connection pads are equal to each other,

wherein a first wire extends from the first connection pad, and

wherein a plurality of second wires extend from the second connection pad.

8. A display device according to claim 7, wherein a flexible printed circuit is connected to the connection terminal portion.

9. A display device according to claim 7, wherein the display device is incorporated in at least one selected from the group consisting of a camera, a computer, a mobile computer, a goggle type display, a video camera, an image reproducing device, and a mobile phone.

10. A display device according to claim 7, wherein the each of the plurality of transistors further contains Ga in the channel formation region.

11. A display device according to claim 7, wherein the first connection pad and the second connection pad are provided outside a sealing region.

12. A display device according to claim 8, wherein at least one connection terminal in the connection terminal portion is connected to a plurality of terminals of the flexible printed circuit, and a contact resistance between the connection terminal and the plurality of terminals of the flexible printed circuit is 5 Ω

or less.

13. A display device comprising:

a pixel portion including a plurality of transistors, wherein each of the plurality of transistors contains In, Zn and O in a channel formation region;

a driver circuit portion; and

a connection terminal portion, wherein the connection terminal portion includes a plurality of connection terminals,

wherein the plurality of connection terminals is provided with a plurality of connection pads, each of which is part of the connection terminal portion,

wherein pitches between the plurality of connection pads are equal to each other,

wherein the plurality of connection pads include a first connection pad and a second connection pad having a line width larger than that of the first connection pad,

wherein a first wire extends from the first connection pad, and

wherein a plurality of second wires extend from the second connection pad.

14. A display device according to claim 13, wherein the display device is incorporated in at least one selected from the group consisting of a camera, a computer, a mobile computer, a goggle type display, a video camera, an image reproducing device, and a mobile phone.

15. A display device according to claim 13, wherein the each of the plurality of transistors further contains Ga in the channel formation region.

16. A display device according to claim 13, wherein the first connection pad and the second connection pad are provided outside a sealing region.