LIQUID CRYSTAL DISPLAY, SYSTEM AND METHOD FOR DISPLAYING THREE-DIMENSIONAL STEREO PICTURES

• US 20110248993A1
• Filed: 04/11/2011
• Published: 10/13/2011
• Est. Priority Date: 04/12/2010
• Status: Active Grant

• Current Assignee: NVIDIA Corporation
• Original Assignee: NVIDIA Corporation
• Inventors: Xu, Shuang
• Granted Patent: US 9,250,449 B2
• Time in Patent Office: Days
• US Class Current: 345/419
• CPC Class Codes: G02B 30/25 using polarisation techniques
• CPC Class Codes: G02B 30/36 using refractive optical elements, e.g. prisms, in the optical path between the images and the observer
• 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: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

A three-dimensional stereo display, and a system and method are provided for controlling the three-dimensional stereo display. The three-dimensional stereo display includes backlight, a first polarizer, a first liquid crystal panel, a second polarizer and a second liquid crystal panel which are sequentially arranged on the backlight source. The second liquid crystal panel switches the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization. Due to the polarization direction of light could be changed by the liquid crystal panel, and makes the light for the left-eye image and the right-eye image are mutual perpendicular. The polarization direction of the light for the left-eye image is the same as that of the left lens, and the polarization direction of the light for the right-eye image is the same as that of the right lens. So the light belongs to the left-eye image or the right-eye image can pass through the left lens or the right lens respectively, then a stereo image will emerge in people'"'"'s brain due to the effect of “fusion activity”. Further, there is no need to close the polarized spectacles, the displaying efficiency is improved compared with the “Active Stereo”.

Claims

1. A liquid crystal display (LCD) for displaying three-dimensional stereo pictures, comprising,

a backlight source;

a first polarizer, a first liquid crystal panel, a second polarizer and a second liquid crystal panel sequentially arranged on said backlight source;

wherein said second liquid crystal panel is used to switch the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization.

2. The LCD of claim 1, wherein the polarizing angle of said first polarizer is perpendicular with that of said second polarizer.

3. The LCD of claim 1, wherein said first liquid crystal panel and said second liquid crystal panel are Twisted-Nematic type liquid crystal panel.

4. The LCD of claim 1, wherein said second liquid crystal panel is Super Twisted-Nematic type liquid crystal panel.

5. The LCD of claim 1, wherein the switching frequency at which said second liquid crystal panel is used to switch the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization is same as the frequency at which the LCD displays left-eye pictures and right-eye pictures alternately.

6. The LCD of claim 1, wherein said LCD is a progressive scanning display.

7. A system for displaying three-dimensional stereo pictures, comprising,

a liquid crystal displays (LCD) for displaying a left-eye image and a right-eye image alternately, said LCD comprises a backlight source, and a first polarizer, a first liquid crystal panel, a second polarizer and a second liquid crystal panel sequentially arranged on said backlight source, wherein said second liquid crystal panel is used to switch the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization;

a graphics processor unit (GPU) for sending the signal for controlling said second liquid crystal panel, and to make said second liquid crystal panel switch the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization.

8. The system of claim 7, further comprising a pair of polarized spectacles, the polarization directions of the left lens and of the right lens of said polarized spectacles are mutual perpendicular.

9. The system of claim 7, wherein the polarizing angle of said first polarizer is perpendicular with that of said second polarizer.

10. The system of claim 7, wherein said first liquid crystal panel and said second quid crystal panel are Twisted-Nematic type liquid crystal panel.

11. The system of claim 7, wherein said second liquid crystal panel is Super Twisted-Nematic type liquid crystal panel.

12. The system of claim 7, wherein the switching frequency of said signal sent from the GPU is same as the frequency at which the LCD displays left-eye pictures and tight-eye pictures alternately.

13. The system of claim 8, wherein when the left-eye image or the right-eye image was displayed on said LCD, the polarization direction of the light passing through said second liquid crystal panel is same as the polarization direction of the left lens or the right lens correspondingly.

14. The system of claim 7, wherein said LCD is a progressive scanning display.

15. A method for displaying three-dimensional stereo pictures, comprising the steps of

controlling a left-eye image and a right-eye image to be displayed on a liquid crystal displays (LCD) alternately, said LCD comprises a backlight source, and a first polarizer, a first liquid crystal panel, a second polarizer and a second liquid crystal panel sequentially arranged on said backlight source;

and

controlling said second liquid crystal panel in such a way that the polarizing angle of the light travelling through and exiting front said second liquid crystal panel is switched between a horizontal and vertical polarization.

16. The method of claim 15, wherein the switching frequency at which said controlling said second liquid crystal panel to switch the polarizing angle of the light travelling through and exiting from said second liquid crystal panel between a horizontal and vertical polarization is same as the frequency at which the LCD displays left-eye pictures and right-eye pictures alternately.

17. The method of claim 15, wherein controlling said second liquid crystal panel in such a way that the polarization directions of the light passing through said second liquid crystal panel is same as the polarization direction of the left lens or the right lens wore by the users, when the left-eye image or the right-eye image was displayed on said LCD.

18. The method of claim 15, wherein said first liquid crystal panel and said second liquid crystal panel are Twisted-Nematic type liquid crystal panel.

19. The method of claim 15, wherein said second liquid crystal panel is Super Twisted-Nematic type liquid crystal panel.

20. The method of claim 15, wherein said LCD displays images in the manner of progressive scanning.