Liquid crystal display device with two liquid crystal

• US 7,868,973 B2
• Filed: 11/27/2007
• Issued: 01/11/2011
• Est. Priority Date: 11/27/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Innocom Technology Limited, InnoLux Corporation
• Inventors: Li, Yuan, Meng, Kai
• Primary Examiner(s): Nguyen; Dung T.
• Application Number:
  US11/998,020
• Publication Number:
  US 20080123025A1
• Time in Patent Office: 1,141 Days
• Field of Search: 349 73- 74
• 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;

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

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 first pixel electrode; and

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;

wherein between each of the first pixel electrodes 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, and 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 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.

3. The liquid crystal display device as claimed in claim 2, wherein a polarizing axis of the first polarizer is perpendicular to that of the second polarizer, and the polarizing axis of the second polarizer is parallel to that of the third polarizer.

4. The liquid crystal display device as claimed in claim 2, wherein polarizing axes of the first, second, and third polarizers are parallel to each other.

5. The liquid crystal display device as claimed in claim 2, 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.

6. The liquid crystal display device as claimed in claim 5, wherein the first, second, third, and fourth alignment films are homogeneously aligned alignment films, respectively.

7. The liquid crystal display device as claimed in claim 6, wherein alignment orientations of the first and second alignment films are parallel to each other, the alignment orientation of the first alignment film is perpendicular to that of the third alignment film, and the alignment orientation of the second alignment film is perpendicular to that of the fourth alignment film.

8. The liquid crystal display device as claimed in claim 6, wherein alignment orientations of the first, second, third, and fourth alignment films are parallel to each other.

9. The liquid crystal display device as claimed in claim 8, wherein long axes of the liquid crystal molecules of the first liquid crystal layer and the second liquid crystal layer maintain an angle of 45°

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

10. 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 first substrate comprises a plurality of contact holes extending therethrough, a plurality of first pixel electrodes are arranged on a surface of the first substrate adjacent to the first liquid crystal layer, a plurality of second pixel electrodes are arranged on another surface of the first substrate adjacent to the second liquid crystal layer, each of the first pixel electrodes is electrically connected to one corresponding second pixel electrode via one corresponding contact hole, 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.

11. The liquid crystal display device as claimed in claim 10, wherein the first and second liquid crystal layers are arranged as mirror images.

12. The liquid crystal display device as claimed in claim 11, 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.

13. The liquid crystal display device as claimed in claim 12, wherein a polarizing axis of the first polarizer is perpendicular to that of the second polarizer, and the polarizing axis of the second polarizer is parallel to that of the third polarizer.

14. The liquid crystal display device as claimed in claim 12, wherein polarizing axes of the first, second, and third polarizers are parallel to each other.

15. The liquid crystal display device as claimed in claim 12, 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.

16. The liquid crystal display device as claimed in claim 15, wherein alignment orientations of the first and second alignment films are parallel to each other, the alignment orientation of the first alignment film is perpendicular to that of the third alignment film, and the alignment orientation of the second alignment film is perpendicular to that of the fourth alignment film.

17. The liquid crystal display device as claimed in claim 15, wherein alignment orientations of the first, second, third, and fourth alignment films are parallel to each other.

18. The liquid crystal display device as claimed in claim 17, wherein long axes of the liquid crystal molecules of the first liquid crystal layer and the second liquid crystal layer maintain an angle of 45°

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

19. The liquid crystal display device as claimed in claim 10, further comprising a plurality of thin film transistors disposed on the first substrate, each thin film transistor electrically connected to one corresponding first pixel electrode and one corresponding second pixel electrode.

20. The liquid crystal display device as claimed in claim 19, further comprising a first common electrode arranged on an inner surface of the second substrate and a second common electrode arranged on an inner surface of the third substrate, wherein each first pixel electrode, a corresponding portion of the first common electrode, and a corresponding portion of the first liquid crystal layer therebetween cooperatively define a first pixel region, each second pixel electrode, a corresponding portion of the second common electrode, and a corresponding portion of the second liquid crystal layer therebetween cooperatively define a second pixel region, and the first and second pixel regions are symmetrically arranged at two opposite sides of the first substrate.