Liquid crystal display device

• US 5,893,624 A
• Filed: 07/08/1997
• Issued: 04/13/1999
• Est. Priority Date: 07/05/1996
• Status: Expired due to Term

• Current Assignee: Beijing Metis Technology Services Center
• Original Assignee: Seiko Instruments Incorporated (Seiko Group)
• Inventors: Matsuhira, Tsutomu, Arai, Satoshi
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Duong, Tai V.
• Application Number:
  US08/889,230
• Time in Patent Office: 644 Days
• Field of Search: 349/143, 349/145, 349/149, 349/150, 349/151, 349/152, 345/206, 361/749, 361/760, 361/764, 361/772, 361/775
• US Class Current: 349/152
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals

Abstract

Drawn configurations of transparent electrodes from connection terminals to pixels in a liquid crystal display device are made different from each other according to the positional relationship between the pixels and the connection terminals, so that the resistance value of a drawn portion and the difference in resistance values between adjoining pixels are made low. This structure improves not only the picture quality of a liquid crystal display device with a wide pitch screen in which a multi-output terminal IC is connected by using fine electrodes, but also the patterning yield.

Claims

1. A liquid crystal display device comprising two substrates, a plurality of transparent electrodes disposed on surfaces of the substrates and having electrode surfaces being opposite to one another in a matrix, a liquid crystal held between the substrates, and pixels formed of the opposite electrode surfaces in the matrix,

wherein the transparent electrodes on at least one of said substrates include a connection terminal portion for connecting a circuit element, a pixel portion composed of the matrix-shaped pixels, and a drawn portion for connecting the connection terminal portion to the pixel portion, and

wherein configurations of the drawn portion include a linear-shaped first drawn configuration which connects at least one center connection terminal at the center of the connection terminal portion to the pixel portion;

a second drawn configuration for connecting a plurality of near center connection terminals at right and left sides of the center connection terminal to the pixel portion, the second drawn configuration being such that the transparent electrodes are linearly drawn in parallel with the first drawn configuration, are bent once in parallel with each other, and are drawn to the pixel portion; and

a third drawn configuration for connecting a plurality of outer connection terminals at both sides of the near center connection terminals to the pixel portion, the third drawn configuration being such that the transparent electrodes are linearly drawn in parallel with the first drawn configuration, are bent in parallel with the second drawn configuration, are further bent at an almost right angle to the first drawn configuration and outward from the center connection terminal, and are finally bent at an almost right angle to be drawn to the pixel portion.

2. A liquid crystal display device as claimed in claim 1, wherein the circuit element connected to the connection terminals is mounted in a COG structure.

3. A liquid crystal display device as claimed in claim 1, wherein the number of liquid crystal drive signal output terminals of the circuit element connected to the connection terminals is 160 or more.

4. A liquid crystal display device as claimed in claim 1, wherein the third drawn configuration is such that a part of the third drawn configuration is drawn to go away from the pixels.

5. A liquid crystal display device as claimed in claim 1, wherein a part of the third drawn configuration is provided with an overcoat.