LIQUID CRYSTAL DISPLAY APPARATUS AND ELECTRONIC APPARATUS

• US 20080055526A1
• Filed: 09/05/2007
• Published: 03/06/2008
• Est. Priority Date: 09/06/2006
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ino, Masumitsu
• Granted Patent: US 8,421,968 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors

Abstract

Disclosed herein is a liquid crystal display apparatus in which a transmission region and a reflection region disposed in parallel. The apparatus includes first and second substrates and a liquid crystal layer disposed between the first and second substrates. The second substrate has at least a counter electrode, an interlayer insulating film and a pixel electrode for forming a fringe field for driving molecules of the liquid crystal. At least one parameter relating to the interlayer insulating film formed on the second substrate is set different between the transmission region side interlayer insulating film and the reflection region side interlayer insulating film so that driving voltages for the transmission and reflection regions are substantially equal to each other.

Claims

1. A liquid crystal display apparatus wherein a transmission region and a reflection region are disposed in parallel, comprising:

a first substrate;

a second substrate; and

a liquid crystal layer disposed between said first and second substrates;

said second substrate having at least a counter electrode, an interlayer insulating film and a pixel electrode configured to form a fringe field for driving molecules of the liquid crystal;

at least one parameter relating to said interlayer insulating film formed on said second substrate being different between the transmission region side interlayer insulating film and the reflection region side interlayer insulating film so that driving voltages for said transmission region and said reflection region are substantially equal to each other.

2. The liquid crystal display apparatus according to claim 1, wherein the parameter relating to said interlayer insulating film is the film thickness.

3. The liquid crystal display apparatus according to claim 2, wherein the film thickness of said transmission region side interlayer film is greater than that of said reflection region side interlayer insulating film.

4. The liquid crystal display apparatus according to claim 3, wherein, where the film thickness of said transmission region side interlayer film is represented by t1 and the film thickness of said reflection region side interlayer insulating film is represented by t2, the ratio t1/t2 in film thickness has a value equal to or higher than 0.15.

5. The liquid crystal display apparatus according to claim 3, wherein the thickness of said liquid crystal layer in the reflection region is smaller than that of said liquid crystal layer in the transmission region.

6. The liquid crystal display apparatus according to claim 1, wherein the parameter relating to said interlayer insulating film is a relative dielectric constant.

7. The liquid crystal display apparatus according to claim 6, wherein the relative dielectric constant of said transmission region side interlayer film is lower than that of said reflection region side interlayer insulating film.

8. The liquid crystal display apparatus according to claim 7, wherein the film thickness of said transmission region side interlayer insulating film is equal to that of said reflection region side interlayer insulating film.

9. The liquid crystal display apparatus according to claim 7, wherein

the film thickness of said transmission region side interlayer insulating film is not less than twice that of said reflection region side interlayer insulating film, and

a phase difference film is formed on said reflection region of said first substrate;

10. The liquid crystal display apparatus according to claim 1, wherein a film thickness and a relative dielectric constant are used as the parameters relating to said interlayer insulating film.

11. The liquid crystal display apparatus according to claim 10, wherein

the film thickness of said transmission region side interlayer insulating film is different from that of said reflection region side interlayer insulating film, and

the relative dielectric constant of said transmission region side interlayer film and that of said reflection region side interlayer insulating film are set to different values from each other so that the driving voltages for the transmission region and the reflection region may be substantially equal to each other.

12. The liquid crystal display apparatus according to claim 10, wherein

said interlayer insulating film has an overlapping portion over which one of the transmission region side interlayer insulating film and the reflection region side interlayer insulating film extends into the other one of the transmission region side interlayer insulating film and the reflection region side interlayer insulating film, and

the relative dielectric constant of the transmission region side interlayer insulating film and that of the reflection region side interlayer insulating film are set to different values from each other so that the driving voltages in the transmission region and the reflection region may be substantially equal to each other.

13. The liquid crystal display apparatus according to claim 11, wherein

the film thickness of the reflection region side interlayer insulation film is greater than that of the transmission region side insulation film, and

the thickness of said liquid crystal layer in the reflection region is smaller than that of said liquid crystal layer in the transmission region.

14. The liquid crystal display apparatus according to claim 1, wherein

a transistor is formed on said second substrate and is connected at a gate electrode thereof to a gate line, at a first diffused layer thereof to a signal line and at a second diffused layer thereof to said pixel electrode, and

said counter electrode is formed in such a manner as to have an overlapping portion with at least one of the gate line and the signal line.

15. An electronic apparatus, comprising

a liquid crystal display apparatus, wherein

a transmission region and a reflection region are disposed in parallel;

said liquid crystal display apparatus including a first substrate, a second substrate, and a liquid crystal layer disposed between said first and second substrates;

said second substrate having at least a counter electrode, an interlayer insulating film and a pixel electrode configured to form a fringe field for driving molecules of the liquid crystal;

at least one parameter relating to said interlayer insulating film formed on said second substrate being different between the transmission region side interlayer insulating film and the reflection region side interlayer insulating film so that driving voltages for said transmission region and said reflection region are substantially equal to each other.