Zero-D dimming for 3D displays

• US 8,520,061 B2
• Filed: 12/14/2009
• Issued: 08/27/2013
• Est. Priority Date: 12/14/2009
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Vos, Martin J., Casner, Glenn E.
• Primary Examiner(s): Shin, Kyung H
• Application Number:
  US12/637,327
• Publication Number:
  US 20110141244A1
• Time in Patent Office: 1,352 Days
• Field of Search: 345/211, 359/465, 348/51
• US Class Current: 348/51
• CPC Class Codes: G02B 3/0006 Arrays G02B3/02, G02B5/188 take precedence
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H04N 13/133 Equalising the characteristics of different image components, e.g. their average brightness or colour balance
• CPC Class Codes: H04N 13/305 using lenticular lenses, e.g. arrangements of cylindrical lenses
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

A method of zero-D dimming backlights for 3D or multi-view displays using right and left image data. The method receives right and left pixel luminance values for the right and left image data, and it remaps the right and left pixel luminance values using a factor based upon an average luminance value or based upon a luminance percentile value or a modified factor that further includes the absolute difference between left and right pixel luminance values. The factor or modified factor are selectively used to remap particular right and left pixel luminance values based upon a disparity consideration. The method results in power savings by dimming the backlight without perceptible or substantial loss in brightness of the display.

Claims

1. A method of zero-D dimming for a display using right and left image data, comprising,

receiving right image data having right pixel luminance values;

receiving left image data having left pixel luminance values;

determining a cutoff value based upon which of the right and left image data have disparity; and

modifying, using a controller, the right and left pixel luminance values, comprising;

modifying the right and left pixel luminance values that are below the cutoff value using a first factor based upon an average or a percentile statistics based luminance value; and

modifying the right and left pixel luminance values that are above the cutoff value using a second factor based upon differences between the right pixel luminance values and the left pixel luminance values,

wherein the modifying step maintains a sufficient amount of the disparity between the right and left image data for generating a 3D or multi-view image.

2. The method of claim 1, wherein the determining step comprises using a percentage of the right and left image data having disparity for the cutoff value.

3. The method of claim 1, wherein the second factor comprises the first factor modified based upon the differences between the right pixel luminance values and the left pixel luminance values.

4. The method of claim 1, wherein the modifying step comprises modifying the right and left pixel luminance values for frames of the right and left image data.

5. The method of claim 1, wherein the receiving steps include receiving the right and left image data for a 3D display.

6. The method of claim 1, wherein the receiving steps include receiving the right and left image data for a multi-view display.

7. A 3D display having zero-D dimming, comprising:

a liquid crystal display panel;

a backlight having light sources capable of being modulated between right image data and left image data;

a double sided prism film disposed between the liquid crystal display panel and the backlight; and

a controller, coupled to the backlight, configured to;

receive right image data having right pixel luminance values;

receive left image data having left pixel luminance values;

determine a cutoff value based upon which of the right and left image data have disparity; and

modify the right and left pixel luminance values, comprising;

modify the right and left pixel luminance values that are below the cutoff value using a first factor based upon an average or a percentile statistics based luminance value; and

modify the right and left pixel luminance values that are above the cutoff value using a second factor based upon differences between the right pixel luminance values and the left pixel luminance values,

wherein the modifying maintains a sufficient amount of the disparity between the right and left image data for generating a 3D image.

8. The 3D display of claim 7, wherein the controller is configured to determine the cutoff value using a percentage of the right and left image data having disparity.

9. The 3D display of claim 7, wherein the second factor comprises the first factor modified based upon the differences between the right pixel luminance values and the left pixel luminance values.

10. The 3D display of claim 7, wherein the controller is configured to modify the right and left pixel luminance values for frames of the right and left image data.