Liquid crystal display device and method of producing the same

• US 6,628,350 B1
• Filed: 08/29/2000
• Issued: 09/30/2003
• Est. Priority Date: 08/30/1999
• 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: Miyashita, Hiroshi
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): NGUYEN, HOAN C
• Application Number:
  US09/650,190
• Time in Patent Office: 1,127 Days
• Field of Search: 349/43, 349/106, 349/78, 349/114, 349/52
• US Class Current: 349/52
• CPC Class Codes: G02F 1/133357 Planarisation layers
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer

Abstract

In an active matrix type display device, an insulating film pattern is formed between scanning lines and/or between signal lines. An upper insulating film is formed on the insulating film pattern and the lines and in spaces between the insulating film patterns and the lines so that the upper insulating film has a continuous top surface at a substantially same level. For further improvement in flatness and adjustment in film thickness of the upper insulating film, the whole surface of the upper insulating film is etched back. After that, pixel electrodes are formed on the upper insulating film.

Claims

1. An active matrix type liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate comprising:

a plurality of insulating film patterns each formed between adjacent scanning lines and/or between adjacent signal lines so that the insulating film patterns do not contact either of the scanning lines or the signal lines;

an upper insulating film formed on the insulating film patterns and the lines between which the respective insulating film patterns are formed, and in spaces between the insulating film patterns and the lines, said upper insulating film having a continuous top surface at a same or approximately same level;

wherein the insulating film patterns comprise an oxide or nitride; and

pixel electrodes formed on the upper insulating film.

2. The liquid crystal display device according to claim 1, wherein each insulating film pattern is formed from a transparent film having a refractive index of 1.4-1.95.

3. An active matrix type liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate, comprising:

insulating film patterns each formed between adjacent scanning lines and/or between adjacent signal lines;

an upper insulating film formed on the insulating film patterns and the lines between which the respective insulating film patterns are formed, and in spaces between the insulating film patterns and the lines, said upper insulating film having a continuous top surface at a same or approximately same level;

pixel electrodes formed on the upper insulating film; and

wherein said upper insulating film has a thickness that is ½

or more of the space between one of the insulating film patterns and the line adjacent to the insulating film pattern.

4. An active matrix type liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate, comprising:

insulating film patterns each formed between adjacent scanning lines and/or between adjacent signal lines;

an upper insulating film formed on the insulating film patterns and the lines between which the respective insulating film patterns are formed, and in spaces between the insulating film patterns and the lines, said upper insulating film having a continuous top surface at a same or approximately same level, wherein the insulating film patterns comprise an oxide or nitride of silicon;

pixel electrodes formed on the upper insulating film; and

a lower insulating film located between the insulating film patterns and the insulating substrate and on the lines, said lower insulating film being made of a material different from materials of the insulating film patterns and the upper insulating film.

5. A method of producing an active-matrix liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate in such directions that the scanning lines and the signal lines intersect each other, comprising:

forming an insulating film pattern between adjacent scanning lines and/or adjacent signal lines so that the insulating film pattern does not contact either of the scanning lines or the signal lines, wherein the insulating film patterns are not color filters; and

forming an upper insulating film on the insulating film pattern and the lines and in spaces between the insulating film pattern and the lines in such a manner that the upper insulating film has a continuous top surface at a same or approximately same level.

6. The method according to claim 5, further comprising thinning the upper insulating film by an etch-back method after forming the upper insulating film.

7. A method of producing an active-matrix liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate in such directions that the scanning lines and the signal lines intersect each other, comprising:

forming an insulating film pattern between adjacent scanning lines and/or adjacent signal lines, the insulating film patterns comprising an oxide or a nitride;

forming an upper insulating film on the insulating film pattern and the lines and in spaces between the insulating film pattern and the lines in such a manner that the upper insulating film has a continuous top surface at a same or approximately same level; and

before forming the insulating film pattern, forming a lower insulating film of a material different from materials of the insulating film pattern and the upper insulating film.

8. A method of producing an active-matrix liquid crystal display device in which a plurality of scanning lines and a plurality of signal lines are arrayed on an insulating substrate in such directions that the scanning lines and the signal lines intersect each other, comprising:

forming an insulating film pattern between adjacent scanning lines and/or adjacent signal lines;

forming an upper insulating film on the insulating film pattern and the lines and in spaces between the insulating film pattern and the lines in such a manner that the upper insulating film has a continuous top surface at a same or approximately same level; and

wherein said upper insulating film has a thickness that is ½

or more of a space between the insulating film pattern and the line that is adjacent to the insulating film pattern.