Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9448432-B2
Application number	US-38328606-A
Country	US
Kind code	B2
Filing date	May 15, 2006
Priority date	Mar 1, 2002
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

It is an object to provide a display having high visibility and a transflective type liquid crystal display device having a reflection electrode having a concavo-convex structure formed without especially increasing the process. During manufacturing a transflective liquid crystal display device, a reflection electrode of a plurality of irregularly arranged island-like patterns and a transparent electrode of a transparent conductive film are layered in forming an electrode having transparent and reflection electrodes thereby having a concavo-convex form to enhance the scattering ability of light and hence the visibility of display. Furthermore, because the plurality of irregularly arranged island-like patterns can be formed simultaneous with an interconnection, a concavo-convex structure can be formed during the manufacturing process without especially increasing the patterning process only for forming a concavo-convex structure. It is accordingly possible to greatly reduce cost and improve productivity.

First claim

What is claimed is:

1. A liquid crystal display device comprising:
a thin-film transistor over a substrate;
a transparent conductive film over the thin-film transistor through an insulating film;
an interconnection over the transparent conductive film; and
a plurality of island-like conductive films over the transparent conductive film,
wherein the thin-film transistor and the transparent conductive film are connected to the interconnection,
wherein the interconnection is not in contact with the plurality of island-like conductive films,
wherein the interconnection is formed from a same layer as the plurality of island-like conductive films, and
wherein the plurality of island-like conductive films have an area ratio of 50-90% of an area occupied by the transparent conductive film.

2. A liquid crystal display device according to claim 1 , wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a digital still camera, a notebook personal computer, a mobile computer, a portable type image reproducing apparatus having a recording medium, a video camera and a cellular phone.

3. A liquid crystal display device according to claim 1 , wherein the transparent conductive film is a pixel electrode.

4. A liquid crystal display device according to claim 1 , wherein the interconnection and the plurality of island-like conductive films are reflective conductive films.

5. A liquid crystal display device comprising:
a thin-film transistor over a substrate;
a transparent conductive film over the thin-film transistor through an insulating film; and
an interconnection and a plurality of island-like conductive films over and in contact with the transparent conductive film,
wherein the thin-film transistor and the transparent conductive film are connected to the interconnection,
wherein the interconnection is not in contact with the plurality of island-like conductive films,
wherein the interconnection is formed from a same layer as the plurality of island-like conductive films, and
wherein the plurality of island-like conductive films have an area ratio of 50-90% of an area occupied by the transparent conductive film.

6. A liquid crystal display device according to claim 5 , wherein the liquid crystal display device is incorporated into an electronic apparatus selected from the group consisting of a digital still camera, a notebook personal computer, a mobile computer, a portable type image reproducing apparatus having a recording medium, a video camera and a cellular phone.

7. A liquid crystal display device according to claim 1 , wherein the plurality of island-like conductive films each have a pattern end having a taper angle of 5-60 degrees.

8. A liquid crystal display device according to claim 5 , wherein the plurality of island-like conductive films each have a pattern end having a taper angle of 5-60 degrees.

9. A liquid crystal display device according to claim 1 , wherein the plurality of island-like conductive films are irregularly arranged.

10. A liquid crystal display device according to claim 5 , wherein the plurality of island-like conductive films are irregularly arranged.

11. A liquid crystal display device according to claim 1 , wherein all bottom surfaces of the plurality of island-like conductive films are in contact with the transparent conductive film.

12. A liquid crystal display device according to claim 5 , wherein all bottom surfaces of the plurality of island-like conductive films are in contact with the transparent conductive film.

Assignees

• Yamazaki Shunpei
• Eguchi Shingo
• Shionoiri Yutaka
• Fujimoto Etsuko
• Semiconductor Energy Lab

Inventors

• Yamazaki Shunpei
• Eguchi Shingo
• Shionoiri Yutaka
• Fujimoto Etsuko

Classifications

• H10D86/481

  integrated with passive devices, e.g. auxiliary capacitors · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D30/673

  characterised by the shapes, relative sizes or dispositions of the gate electrodes · CPC title

• G02F1/133555 Primary

  Transflectors · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title