LCD with color filter substrate with tapering color filter portions overlapped by electrode and black matrix layers

• US 6,392,728 B2
• Filed: 12/15/2000
• Issued: 05/21/2002
• Est. Priority Date: 11/27/1997
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tanaka, Keiichi, Yamamoto, Tomohiko
• Primary Examiner(s): Ton, Toan
• Assistant Examiner(s): SCHECHTER, ANDREW M
• Application Number:
  US09/736,372
• Publication Number:
  US 20010000437A1
• Time in Patent Office: 522 Days
• Field of Search: 349/106, 349/110, 349/108, 349/111
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133516 Methods for their manufacture, e.g. printing, electro-deposition or photolithography
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 2201/121 common or background

Abstract

An LCD is provided, the LCD including a color filter substrate with tapering color filter portions overlapped by electrode and/or black matrix layers. The other substrate (e.g., active matrix substrate) may include pixel electrodes, address lines, and switching elements.

Claims

1. A liquid crystal display device including a first substrate and a second substrate facing each other with a liquid crystal layer interposed therebetween,

wherein the second substrate includes thereon:

a plurality of pixel electrodes arranged in a matrix;

a plurality of gate bus lines arranged in parallel with one another near the pixel electrodes;

switching elements for selectively driving the pixel electrodes; and

reference lines arranged in parallel with the gate bus lines for applying a reference potential to the switching elements,

wherein the first substrate includes thereon;

a color filter layer having colored portions of a plurality of colors arranged to correspond to pixel regions; and

a plurality of source bus lines formed on the color filter layer to cross the gate bus lines,

wherein a black matrix layer comprising a photosensitive resin material is formed to partly overlap and overlie the source bus lines and fill gaps between the colored portions, and a thickness of the black matrix layer overlapping the source bus lines is equal to or less than a thickness of the color filter layer, and

wherein peripheries of the colored portions are tapered, and the black matrix layer partly overlaps the tapered peripheries.

2. A liquid crystal display device according to claim 1, wherein the thickness of the black matrix layer overlapping the source bus lines is 400 nm or more.

3. A liquid crystal display device according to claim 1, wherein a thickness of overlap portions of the black matrix layer and the tapered peripheries of the colored portions is equal to or less than a thickness of centers of the colored portions.

4. A liquid crystal display device comprising:

a first substrate and a second substrate facing each other with a liquid crystal layer interposed therebetween,

wherein the second substrate includes thereon;

a plurality of pixel electrodes arranged in a matrix;

a plurality of gate bus lines arranged in parallel with one another near the pixel electrodes;

switching elements for selectively driving the pixel electrodes; and

reference lines arranged in parallel with the gate bus lines for applying a reference potential to the switching elements,

wherein the first substrate includes thereon;

a color filter layer having colored portions of a plurality of colors arranged to correspond to pixel regions; and

a plurality of source bus lines formed on the color filter layer to cross the gate bus lines,

wherein a black matrix layer comprising a photosensitive resin material is formed to partly overlap and overlie the source bus lines and fill gaps between the colored portions so that in at least one of said gaps a portion of one of said source lines is located between the first substrate and the black matrix layer, and a thickness of the black matrix layer overlapping the source bus lines is equal to or less than a thickness of the color filter layer, and

wherein peripheries of the colored portions are tapered, and the black matrix layer at least partially overlaps at least some of the tapered peripheries.