Display system

• US 8,422,112 B2
• Filed: 02/04/2008
• Issued: 04/16/2013
• Est. Priority Date: 02/04/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Li, Yu-Tang, Lin, Chun-Chuan, Lo, Hsin-Hsiang, Huang, Wan-Chien
• Primary Examiner(s): Ben, Loha
• Application Number:
  US12/866,136
• Publication Number:
  US 20100315577A1
• Time in Patent Office: 1,898 Days
• Field of Search: 359245-247, 359/251, 349/9, 349/33, 349/62, 349/63, 349/67, 349/96, 349/113, 349/117, 349/158, 362/19, 362/268, 353/38
• US Class Current: 359/246
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 27/28 for polarising used in stereoscopes G02B30/25
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00

Abstract

A display system 1 is composed of a ghost image reducing device 100 and an image device 10. The ghost image reducing device 100 comprises an image reflecting element 110 and a polarizing element 120. The image reflecting element 110 includes a substrate 112 and a phase modulating element 114 which is adjacent to the substrate 112 and has a reflecting surface 114a. The image device 10 generates a polarized image light P1 which is received by the reflecting surface 114a. Then, a portion of the polarized image light P1 is reflected by the reflecting surface 114a for producing a first reflecting polarized image light P2, another portion of the polarized light P1 is projected into the phase modulating element 114 and reflected by the substrate 112 for producing a second reflecting polarized image light S2 whose polarizing direction is different from that of the first reflecting polarized image light P2.

Claims

1. A display system, comprising:

an image device used for producing a polarized image light;

an image reflecting element comprising;

a substrate; and

a phase modulating element adjacent to the substrate, the phase modulating element having a reflecting surface for receiving the polarized image light, wherein the reflecting surface reflects a portion of the polarized image light to produce a first reflecting polarized image light after the polarized image light is projected to the reflecting surface, another portion of the polarized image light enters the phase modulating element and is reflected by the substrate and then is projected out of the reflecting surface for producing a second reflecting polarized image light, and the phase difference between the phase of the first reflecting polarized image light and that of the second reflecting polarized image light is substantially equal to nu, and n is a positive odd number; and

a polarizing element for receiving and allowing the first reflecting polarized image light to pass therethrough, and blocking the second reflecting polarized image light.

2. The system according to claim 1, wherein the substrate is a transparent substrate.

3. The system according to claim 1, wherein the phase modulating element is a quarter-wave plate or a quarter-wave coating layer disposed on the substrate.

4. The system according to claim 1, wherein the image device is a liquid crystal display panel and the polarized image light is produced by the liquid crystal display panel.

5. The system according to claim 1, wherein the image device is an image polarizing element incorporated with an image generating device, and the polarized image light is produced by an image light generated from the image generating device and then passing through the image polarizing element.

6. The system according to claim 1, wherein the polarized image light is a linearly-polarized image light, circularly polarized image light or elliptically polarized image light.

7. A display system, comprising:

an image device used for producing a polarized image light;

a transparent substrate having a first surface and a second surface opposite to the first surface; and

a phase modulating element disposed on the first surface of the transparent substrate, the phase modulating element having a reflecting surface for receiving the polarized image light, wherein the reflecting surface reflects a portion of the polarized image light to produce a reflecting polarized image light while the polarized image light is projected to the reflecting surface, another portion of the polarized image light is propagated across the phase modulating element and modulated by the phase modulating element to be an incident polarized image light having a desired polarizing direction, most of the incident polarized image light passed through the transparent substrate.

8. The system according to claim 7, wherein the first surface of the transparent substrate is substantially parallel to the second surface of the transparent substrate.

9. The system according to claim 7, wherein the polarized image light is a linearly polarized image light, and the phase modulating element is a half-wave plate or a half-wave coating layer disposed on the transparent substrate.

10. The system according to claim 9, the linearly polarized image light is S-polarized image light or TE electromagnetic wave.

11. The system according to claim 7, wherein the polarized image light is a circularly polarized image light or an elliptically polarized image light, and the phase modulating element is a quarter-wave plate or a quarter-wave coating layer disposed on the transparent substrate.

12. The system according to claim 7, wherein the image device is a liquid crystal display panel and the polarized image light is generated by the liquid crystal display panel.

13. The system according to claim 7, wherein the incident angle with which the polarized image light is projected from the image device to the phase modulating element is near or equal to the Brewster'"'"'s angle at the interface from air to the phase modulating element.

14. A display system, comprising:

an image device for producing polarized image light;

a phase retardation plate disposed on the image device;

a transparent substrate having a first surface and a second surface disposed opposite the first surface;

a phase modulating element disposed on the first surface of the transparent substrate;

wherein a portion of the polarized image light is reflected by the phase modulating element and then emitted in an observation direction, and another portion of the polarized image light is transmitted into the phase modulating element and the substrate and is mostly emitted from the second surface of the transparent substrate.

15. The display system according to claim 14, wherein the image device is capable of generating linearly polarized image light, the phase retardation plate is a quarter-wave plate and the phase modulating element is a quarter-wave plate.

16. The display system according to claim 15, further comprising:

an angle adjusting device for adjusting an angle between an optical axis of the retardation plate and polarization direction of the image light.

17. The display system according to claim 14, wherein the image device is capable of generating linearly polarized image light, the phase retardation plate is a half-wave plate and the phase modulating element is a half-wave plate.

18. The display system according to claim 17, further comprising:

an angle adjusting device for adjusting an angle between an optical axis of the retardation plate and polarization direction of the image light.

19. The display system according to claim 14, wherein the image device is capable of generating elliptically polarized image light or circularly polarized image light, the phase retardation plate is a quarter-wave plate and the phase modulating element is a half-wave plate.

20. The display system according to claim 19, further comprising:

an angle adjusting device for adjusting an angle between an optical axis of the retardation plate and polarization direction of the image light.