Controlling polarization for liquid crystal displays

• US 8,848,114 B2
• Filed: 04/29/2011
• Issued: 09/30/2014
• Est. Priority Date: 05/23/2005
• Status: Expired due to Fees

• Current Assignee: Min-Shine Chow Wang, Ran-Hong Raymond Wang
• Original Assignee: Min-Shine Chow Wang, Ran-Hong Raymond Wang
• Inventors: Wang, Ran-Hong Raymond, Wang, Min-Shine Chow
• Primary Examiner(s): DUDEK, JAMES A
• Application Number:
  US13/098,355
• Publication Number:
  US 20110205471A1
• Time in Patent Office: 1,250 Days
• Field of Search: 349/96, 349/12, 349/117, 349/161
• US Class Current: 349/12
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133541 Circular polarisers
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2413/03 Number of plates being 3
• CPC Class Codes: G02F 2413/07 All plates on one side of the LC cell

Abstract

Certain embodiments of liquid crystal display protection panels and liquid crystal display protection panel integrals have low reflection for outdoor applications. Various embodiments also have the advantage of being able to provide increased contrast and brightness for certain convenient viewing directions for outdoor viewers wearing polarized sunglasses.

Claims

1. A polarized functional part module for integrating with a liquid crystal display having a liquid crystal layer and a polarizer, PA forward said liquid crystal layer, said functional part module defining vertical and horizontal axes, said functional part module having a module rear surface that may be positioned forward a front surface of said liquid crystal display and a module front surface through which light from said liquid crystal display may exit to a viewer, said module comprising:

an EMI shielding functional part comprising a sheet member; and

a linear polarizer, PB, and a quarter wave retarder, RB,

wherein said EMI shielding functional part sheet member is separated from said polarizer, PA,

wherein said polarizer, PA is the closest linear polarizer to said liquid crystal layer that is forward said liquid crystal layer, and

wherein said module front surface comprises an anti-reflection treatment.

2. The functional part module of claim 1, wherein said EMI shielding functional part is rearward said linear polarizer, PB.

3. The functional part module of claim 1, wherein said quarter wave retarder RB is rearward said linear polarizer, PB.

4. The functional part module of claim 3, wherein said EMI shielding functional part is rearward said retarder, RB.

5. The functional part module of claim 3, further comprising a retarder, RA, rearward said retarder RB.

6. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 1, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

7. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 3, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

8. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 5, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

9. The functional part module of claim 1, further comprising a touch panel, an infrared filter or an LCD heater.

10. The functional part module of claim 1, further comprising a touch panel.

11. The functional part module of claim 1, further comprising an infrared filter.

12. The functional part module of claim 1, further comprising an LCD heater.

13. The functional part module of claim 9, wherein said retarder RB is rearward said linear polarizer PB.

14. The functional part module of claim 13, further comprising a retarder RA rearward said retarder RB.

15. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 9, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

16. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 13, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

17. A display device comprising a liquid crystal display integrated with the polarized functional part module of claim 14, said liquid crystal display disposed rearward said polarized functional part module, said liquid crystal display comprising a liquid crystal cell, at least a linear polarizer PA, and a backlighting device.

18. A reflective functional part integrated display comprising:

a liquid crystal display module defining vertical and horizontal axes and having a module front surface that can selectively output linearly polarized light oriented along a first linear polarization axis, said liquid crystal display module comprising, a liquid crystal cell, a linear polarizer PA, and a light module;

a polarized reflective functional part forward said liquid crystal display module, said polarized reflective functional part having a rear surface and comprising a second linear polarizer PB having a second linear polarization axis, and comprising at least two of a touch panel, an EMI shield, an infrared filter and an LCD heater;

a retarder, RA, rearward said polarized reflective functional part;

and a display front surface through which light from said light module exits,

wherein said display front surface comprises an anti-reflection treatment.

19. The display of claim 18, further comprising a retarder layer RB positioned between said second linear polarizer PB and said retarder RA.

20. The display of claim 18, wherein said polarized reflective functional part comprises said EMI shield and said touch panel, said EMI shield being positioned rearward of said touch panel.

21. The display of claim 18, wherein said polarized reflective functional part comprises said EMI shield and said touch panel, said EMI shield being positioned forward of said touch panel.