Back light unit for stereoscopic display

• US 8,963,824 B2
• Filed: 06/27/2011
• Issued: 02/24/2015
• Est. Priority Date: 06/28/2010
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Ninan, Ajit
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US13/805,317
• Publication Number:
  US 20130093804A1
• Time in Patent Office: 1,338 Days
• Field of Search: 345/102, 345/109
• US Class Current: 345/102
• CPC Class Codes: G06T 15/00 3D [Three Dimensional] image rendering
• CPC Class Codes: G09G 2310/0237 Switching ON and OFF the backlight within one frame
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H04N 13/334 using spectral multiplexing
• CPC Class Codes: H04N 13/337 using polarisation multiplexing
• CPC Class Codes: H04N 13/341 using temporal multiplexing

Abstract

Techniques for 3D back light units are described. In some possible embodiments, in a first time interval during which one or more back light units of a display system are turned off, a complete set of left pixel values in a left frame is outputted to a display panel of the display system. In some possible embodiments, in a second time interval during which the complete set of left pixel values in the left frame has been outputted to the display panel of the display system, the one or more back light units are turned on to illuminate the display panel and the second time interval is subsequent to, and is not overlapped with, the first time interval.

Claims

1. A method of displaying three-dimensional images, the method comprising:

in a first time interval during which one or more back light units of a display system are turned off, outputting a complete set of left pixel values in a left frame to a display panel of the display system, wherein outputting the complete set of left pixel values in the left frame to the display panel of the display system further comprises;

loading pixel values in the complete set of left pixel values to a plurality of display segments of the display panel; and

holding the pixel values in the plurality of display segments of the display panel; and

in a second time interval during which the complete set of left pixel values in the left frame has been outputted to the display panel of the display system, turning on the one or more back light units of a first set to illuminate the display panel, wherein the second time interval is subsequent to, and is not overlapped with, the first time interval; and

repeating the outputting of the complete set of the left pixel values in the left frame to the display panel,

wherein turning on the one or more back light units of the first set to illuminate the display panel occurs at a subsequent time to a time at which the complete set of left pixel values has been loaded into the display panel, and

wherein the first set of the one or more back light units emit lights with first light wavelengths, and a second set of the one or more back lights units emit lights with second different light wavelengths.

2. The method of claim 1, further comprising:

in a third time interval during which the one or more back light units are turned off, outputting a complete set of right pixel values in a right frame to the display panel, wherein the third time interval is subsequent to, and is not overlapped with, the second time interval; and

in a fourth time interval during which the complete set of right pixel values in the right frame has been outputted to the display panel, turning on the one or more back light units to illuminate the display panel, wherein the fourth time interval is subsequent to, and is not overlapped with, the third time interval.

3. The method of claim 1, wherein the first light wavelengths are configured to transmit through a viewer'"'"'s glasses for a left perspective but not to transmit through the viewer'"'"'s glasses for a right perspective;

and wherein the second light wavelengths are configured to transmit through the viewer'"'"'s glasses for the right perspective but not to transmit through the viewer'"'"'s glasses for the left perspective.

4. The method of claim 3, wherein the viewer'"'"'s glasses are passive.

5. The method of claim 1, further comprising setting an active polarizer of the display system to a left polarization direction for a particular time interval, wherein the particular time interval overlaps with the second time interval.

6. The method of claim 5, wherein the particular time interval encompasses the second time interval.

7. An apparatus comprising a processor and configured to perform the method recited in claim 1.

8. A non-transitory computer readable storage medium, comprising software instructions, which when executed by one or more processors cause performance of the method recited in claim 1.