In-plane field type transflective liquid crystal display device

• US 7,321,408 B2
• Filed: 12/31/2004
• Issued: 01/22/2008
• Est. Priority Date: 02/27/2004
• Status: Expired due to Fees

• Current Assignee: InnoLux Corporation
• Original Assignee: Innolux Display Corporation (InnoLux Corporation)
• Inventors: Yang, Chiu-Lien
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Chung; David Y.
• Application Number:
  US11/028,031
• Publication Number:
  US 20050190324A1
• Time in Patent Office: 1,117 Days
• Field of Search: 349/114, 349/141
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

A liquid crystal display device (10) includes an upper substrate (12), a lower substrate (14) and a liquid crystal layer (16) interposed between the upper substrate and the lower substrate. A plurality of pixel regions, each pixel region comprising a pixel electrode and a common electrode (148a, 148b), for applying a voltage to the liquid crystal layer. Each pixel region includes a reflection region and a transmission region; and all the pixel and common electrodes are positioned at either the upper substrate or the lower substrate. The display working both in reflection mode and transmission mode has a wide view angle.

Claims

1. A liquid crystal display device comprising:

an upper substrate;

a lower substrate comprising a dielectric transflector;

a liquid crystal layer interposed between the upper substrate and the lower substrate;

a plurality of pixel regions, each pixel region comprising a pixel electrode and a common electrode, for applying a voltage to the liquid crystal layer;

wherein each pixel region includes a reflection region and a transmission region; and

all the pixel and common electrodes are positioned at the upper substrate.

2. The liquid crystal display device as claimed in claim 1, wherein the dielectric transflector, comprises one or more stacks of dielectric materials, each stack comprising a plurality of thin film dielectric layers.

3. The liquid crystal display device as claimed in claim 1, wherein the dielectric transflector, the dielectric transflector in each pixel region have a reflection area corresponding to the reflection region and a transmission area corresponding to the transmission region.

4. The liquid crystal display device as claimed in claim 3, wherein the upper substrate further comprises passivation layers positioned in the reflection regions between the color filter and the alignment film.

5. The liquid crystal display device as claimed in claim 4, wherein each of the passivation layers has an uneven surface nearest to the liquid crystal layer.

6. The liquid crystal display device as claimed in claim 5, wherein a thickness of the color filter in the reflection region of each pixel region is less than a thickness of the color filter in the transmission region of the pixel region.

7. The liquid crystal display device as claimed in claim 5, wherein a part of the color filter in the reflection region of each pixel region has at least one hole therein.

8. The liquid crystal display device as claimed in claim 3, wherein the reflection area of the dielectric transflector is made of one or more highly reflective materials, and the transmission area of the dielectric transflector is made of one or more translucent materials or a material having one or more holes therein.

9. The liquid crystal display device as claimed in claim 1, wherein the tower substrate comprises in turn the dielectric transflector, a polarizer, a glass plate, and an alignment film.

10. The liquid crystal display device as claimed in claim 1, wherein the upper substrate comprises in turn a polarizer, a glass plate, the common and pixel electrodes, and an alignment film, and the lower substrate comprises in turn a polarizer, a glass plate, the dielectric transflector, a color filter, and an alignment film.

11. A liquid crystal display device comprising:

an upper substrate;

a lower substrate comprising a dielectric transflector;

a liquid crystal layer interposed between the upper substrate and the lower substrate;

a plurality of pixel regions, each pixel region comprising a pixel electrode and a common electrode, for applying a voltage to the liquid crystal layer, wherein each pixel region includes a reflection region and a transmission region; and

a color filter positioned at either the upper substrate or the lower substrate, and having different thicknesses in the reflection region and the transmission region of each pixel region;

wherein all the pixel and common electrodes are positioned at the upper substrate.

12. The liquid crystal display device as claimed in claim 11, wherein the dielectric transflector, comprises one or more stacks of dielectric materials, each stack comprising a plurality of thin film dielectric layers.

13. The liquid crystal display device as claimed in claim 11, wherein the dielectric transflector, the dielectric transflector in each pixel region have a reflection area corresponding to the reflection region and a transmission area corresponding to the transmission region.

14. The liquid crystal display device as claimed in claim 13, wherein a thickness of the color filter in the transmission region of each pixel region is substantially twice a thickness of the color filter in the reflection region of the pixel region.

15. A liquid crystal display device comprising:

an upper substrate;

a lower substrate comprising a dielectric transflector;

a liquid crystal layer interposed between the upper substrate and the lower substrate;

a plurality of pixel regions, each pixel region comprising a pixel electrode and a common electrode, for applying a voltage to the liquid crystal layer, wherein each pixel region includes a reflection region and a transmission region; and

a color filter positioned at either the upper substrate or the lower substrate, the color filter in each pixel region having a part in the reflection region with no color dye therein;

wherein all the pixel and common electrodes are positioned at the upper substrate.

16. The liquid crystal display device as claimed in claim 15, wherein the dielectric transflector, comprises one or more stacks of dielectric materials, each stack comprising a plurality of thin film dielectric layers.

17. The liquid crystal display device as claimed in claim 15, wherein the dielectric transflector, the dielectric transflector in each pixel region have a reflection area corresponding to the reflection region and a transmission area corresponding to the transmission region.

18. The liquid crystal display device as claimed in claim 15, wherein a thickness of the color filter in the transmission region of each pixel region is substantially twice a thickness of the color filter in the reflection region of the pixel region.

19. The liquid crystal display device as claimed in claim 18, wherein a part of the color filter in the reflection region of each pixel region has at least one hole therein.