Liquid crystal display device with two liquid crystal

• US 20080123025A1
• Filed: 11/27/2007
• Published: 05/29/2008
• Est. Priority Date: 11/27/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Innocom Technology Limited, Innolux Display Corporation (InnoLux Corporation)
• Inventors: Meng, Kai, Li, Yuan
• Granted Patent: US 7,868,973 B2
• Time in Patent Office: Days
• US Class Current: 349/74
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G02F 1/1396 the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell G02F1/141 takes precedence

Abstract

An exemplary LCD device (2) includes a first substrate (21), a second substrate (22), a third substrate (23), a first liquid crystal layer (24), and a second liquid crystal layer (25). The first, second, and third substrates are arranged parallel to one another, and the first substrate is interposed between the second and third substrates. The first liquid crystal layer is interposed between the first substrate and the second substrate. The second liquid crystal layer is interposed between the first substrate and the third substrate. Optical rotations of the liquid crystal molecules of the first liquid crystal layer and the liquid crystal molecules of the second liquid crystal layer are reversed relative to each other, with the liquid crystal molecules of the first and second liquid crystal layers being arranged enantiomorphously at the respective opposite sides of the first substrate.

Claims

1. A liquid crystal display device, comprising:

a first substrate, a second substrate, and a third substrate arranged parallel to one another, the first substrate being interposed between the second and third substrates;

a first liquid crystal layer interposed between the first substrate and the second substrate, the first liquid crystal layer comprising liquid crystal molecules; and

a second liquid crystal layer interposed between the first substrate and the third substrate, the second liquid crystal layer comprising liquid crystal molecules;

wherein optical rotations of the liquid crystal molecules of the first liquid crystal layer and the liquid crystal molecules of the second liquid crystal layer are reversed relative to each other, with the liquid crystal molecules of the first and second liquid crystal layers being arranged enantiomorphously at the respective opposite sides of the first substrate.

2. The liquid crystal display device as claimed in claim 1, further comprising a plurality of thin film transistors and a plurality of first pixel electrodes alternatively arranged at a surface of the first substrate, each of the thin film transistors being electrically connected to a corresponding pixel electrode.

3. The liquid crystal display device as claimed in claim 2, further comprising a plurality of second pixel electrodes arranged at another surface of the first substrate, each of the second pixel electrodes being opposite to one of the first pixel electrodes.

4. The liquid crystal display device as claimed in claim 3, wherein between each of the first pixel electrode and a corresponding second pixel electrode, a contact hole is formed through the first substrate, the first pixel electrode is electrically connected to the corresponding second pixel electrode via the corresponding contact hole.

5. The liquid crystal display device as claimed in claim 1, further comprising a first polarizer arranged at one side of the first substrate, a second polarizer arranged at an outer surface of the second substrate, and a third polarizer arranged at an outer surface of the third substrate.

6. The liquid crystal display device as claimed in claim 5, wherein a polarizing axis of the first polarizer is perpendicular to that of the second polarizer, and a polarizing axis of the second polarizer is parallel to that of the third polarizer.

7. The liquid crystal display device as claimed in claim 5, wherein polarizing axes of the first, second, and third polarizers are parallel to each other.

8. The liquid crystal display device as claimed in claim 1, further comprising a first alignment film arranged between the first substrate and the first liquid crystal layer, a second alignment film arranged between the first substrate and the second liquid crystal layer, a third alignment film arranged between the second substrate and the first liquid crystal layer, and a fourth alignment film arranged between the third substrate and the second liquid crystal layer.

9. The liquid crystal display device as claimed in claim 8, wherein the first, second, and third alignment films are homogeneously aligned alignment films, respectively.

10. The liquid crystal display device as claimed in claim 9, wherein alignment orientations of the first, second, and third alignment films are parallel to each other.

11. The liquid crystal display device as claimed in claim 9, wherein alignment orientations of the first and second alignment films are parallel to each other, an alignment orientation of the first alignment film is perpendicular to that of the third alignment film, and an alignment of the second alignment film is perpendicular to that of the fourth alignment film.

12. The liquid crystal display device as claimed in claim 11, wherein long axes of liquid crystal molecules of the first crystal layer and the second crystal layers maintain an angle of 45°

relative to polarizing directions of the first, second and third polarizers.

13. A liquid crystal display device, comprising:

a liquid crystal display cell comprising a first substrate and a second substrate arranged parallel to each other, and a first liquid crystal layer sealed between the first and second substrates; and

a liquid crystal compensation cell comprising the first substrate and a third substrate arranged parallel to each other, and a second liquid crystal layer sealed between the first and third substrates;

wherein the liquid crystal compensation cell compensates an optical phase difference of the liquid crystal display cell, and optical rotations of liquid crystal molecules of the first and second liquid crystal layers are reversed relative to each other.

14. The liquid crystal display device as claimed in claim 13, wherein the first and second liquid crystal layers are arranged as mirror images.

15. The liquid crystal display device as claimed in claim 14, further comprising a first polarizer arranged at one surface of the first substrate, a second polarizer arranged at an outer surface of the second substrate, and a third polarizer arranged at an outer surface of the third substrate.