CF on TFT liquid crystal display having reduced dot defects

• US 6,853,408 B2
• Filed: 03/22/2002
• Issued: 02/08/2005
• Est. Priority Date: 03/29/2001
• Status: Expired due to Fees

• Current Assignee: Vista Peak Ventures LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: NEC LCD Technologies Limited (Tianma Microelectronics Company Limited)
• Inventors: Hidehira, Masanobu, Sakamoto, Michiaki, Okamoto, Mamoru
• Primary Examiner(s): Chowdhury, Tarifur R.
• Assistant Examiner(s): AKKAPEDDI, PRASAD R
• Application Number:
  US10/102,871
• Publication Number:
  US 20020140883A1
• Time in Patent Office: 1,054 Days
• Field of Search: 349/44, 349/110, 349/111
• US Class Current: 349/44
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

A CF on TFT type liquid crystal display and a method of manufacturing the same. The liquid crystal display has a plurality of parallel scanning lines, a plurality of parallel data lines which cross the scanning lines, thin film transistors each disposed in the proximity of an intersection between one of the scanning lines and one of the data lines, and pixel electrodes disposed in a matrix and each coupled with one of the thin film transistors. The light shield film is formed over areas including at least the thin film transistors but except over portions which become banks and hinder flow of developer for patterning the light shield film. As an embodiment, the light shield film can be formed along the data lines, and also partially along the scanning lines except a part of each portion of the scanning lines between adjacent data lines.

Claims

1. A method of manufacturing a liquid crystal display having a plurality of parallel scanning lines, a plurality of parallel data lines which cross said scanning lines to form intersections with said scanning lines, thin film transistors each disposed in the proximity of an intersection between one of said scanning lines and one of said data lines, and pixel electrodes disposed in a matrix and each coupled with one of said thin film transistors, said method comprising:

forming a light shield film that covers the thin film transistors and the entirety of the data lines but does not cover portions of the scanning lines that extend between said intersections with respective ones of said data lines and that are not adjacent to said thin film transistors.

2. A method of manufacturing a liquid crystal display as set forth in claim 1, wherein said liquid crystal display comprises a contact hole in each of areas surrounded by said scanning lines and said data lines, and wherein said portions of said scanning lines that are not covered by said light shield film include portions that are adjacent to said contact holes.

3. A method of manufacturing a liquid crystal display as set forth in claim 1, wherein each of said pixel electrodes is formed into an elongated rectangular shape.

4. A liquid crystal display comprising:

a plurality of scanning lines disposed parallel to each other;

a plurality of data lines which are disposed parallel to each other and which cross said scanning lines so as to form intersections of said scanning lines with respective ones of said data lines;

thin film transistors each disposed in the proximity of an intersection between one of said scanning lines and one of said data lines;

pixel electrodes disposed in a matrix and each coupled with one of said thin film transistors; and

a light shield film that covers the thin film transistors and the entirety of the data lines but does not cover portions of the scanning lines that extend between said intersections of said scanning lines with respective ones of said data lines and that are not adjacent to said thin film transistors.

5. A liquid crystal display as set forth in claim 4, wherein said liquid crystal display comprises a contact hole in each of areas surrounded by said scanning lines and said data lines, and wherein said portions of said scanning lines that are not covered by said light shield film include portions that are adjacent to said contact holes.

6. A liquid crystal display as set forth in claim 4, wherein each of said pixel electrodes has an elongated rectangular shape which is elongated along said data lines.

7. A liquid crystal display comprising:

a plurality of scanning lines disposed parallel to each other;

a plurality of data lines which are disposed parallel to each other and which cross said scanning lines;

thin film transistors each disposed in the proximity of an intersection between one of said scanning lines and one of said data lines;

pixel electrodes disposed in a matrix and each coupled with one of said thin film transistors; and

a light shield film that covers the thin film transistors and the entirety of the data lines but does not cover portions of the scanning lines that are adjacent to contact holes located in each of areas surrounded by said scanning lines and said data lines.