Substrate for use in a liquid crystal display and liquid crystal display using the same

• US 7,050,137 B2
• Filed: 09/27/2002
• Issued: 05/23/2006
• Est. Priority Date: 09/28/2001
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Misaki, Katsunori, Oda, Tomoshige, Ikeda, Masahiro, Doi, Seiji, Kondo, Naoto, Fujikawa, Tetsuya, Tanose, Tomonori, Takagi, Takashi, Inoue, Hiroyasu, Sawasaki, Manabu, Matsui, Akihiro, Kihara, Masahiro, Hirota, Shiro, Hoshino, Atuyuki, Saguchi, Takuya, Sukenori, Hidetoshi, Komorita, Akira
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): Wang, George Y.
• Application Number:
  US10/259,977
• Publication Number:
  US 20030063249A1
• Time in Patent Office: 1,334 Days
• Field of Search: 349/149, 349/59, 349/72, 257/59, 257/72
• US Class Current: 349/149
• CPC Class Codes: G02F 1/13458 Terminal pads
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line

Abstract

The invention relates to a substrate for use in a liquid crystal display of a CF-on-TFT structure in which a color filter is formed on the side of an array substrate in which a switching element is formed, and has an object to provide a substrate for use in a liquid crystal display, which enables simplification of a manufacturing process typified by a photolithography process and has high reliability. The substrate for use in the liquid crystal display is constructed to include external connection terminals which include first terminal electrodes electrically connected to gate bus lines led out from a plurality of pixel regions arranged on a glass substrate in a matrix form, second terminal electrodes formed of forming material of a pixel electrode and directly on the glass substrate, and electrode coupling regions for electrically connecting the first and the second terminal electrodes, and which electrically connect an external circuit and the gate bus lines.

Claims

1. A substrate for use in a liquid crystal display comprising:

an insulating substrate cooperating with an oppositely arranged opposite substrate to hold a liquid crystal;

a pixel electrode formed in each of a plurality of pixel regions arranged in a matrix form on the insulating substrate;

a switching element connected to the pixel electrode and a bus line;

an external connection terminal for electrically connecting an external circuit and the bus line, the external connection terminal including a first terminal electrode electrically connected to the bus line, a second terminal electrode formed of a forming material of the pixel electrode and on the insulating substrate, and an electrode coupling region for electrically connecting the first and the second terminal electrodes; and

an overcoat layer formed between the switching element and the pixel electrode and made of an insulating resin material,

wherein the overcoat layer is not formed at least between the second terminal electrode and the insulating substrate.

2. A substrate for use in a liquid crystal display according to claim 1, wherein the overcoat layer includes a protrusion in the vicinity of the electrode coupling region.

3. A liquid crystal display comprising a pair of substrates and a liquid crystal sealed between the pair of substrates,

wherein one of the substrates is a substrate for use in a liquid crystal display according to claim 1.

4. A liquid crystal display according to claim 3, wherein the liquid crystal includes polymer providing a pre-tilt angle to liquid crystal molecules.