Method and Apparatus For Adjusting Drive Values for Dual Modulation Displays
AssigneeDolby Laboratories Licensing Corporation
InventorsRobin Atkins, Neil W. Messmer
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Abstract
Method and apparatus are provided for determining and adjusting drive values for a display comprising light source modulation layer such as a backlight array of LED and a display modulation layer such as an LCD panel. Image regions for which any of the display modulation layer drive values are above a predetermined threshold maximum value or below a predetermined threshold minimum value are flagged. The light source modulation layer control values determined for a subsequent frame of image data may be adjusted based on the flagged image regions. The adjustments to the light source modulation layer control values may reduce artifacts in the displayed image and increase the efficiency of the display.
Claims21
(canceled)
A method for generating drive values for a display comprising a light source modulation layer and a display modulation layer, the method comprising:
- receiving a first frame of image data;
- determining a first set of light source modulation layer drive values based at least in part on the first frame of image data;
- determining an expected luminance profile at the display modulation layer, based at least in part on the first set of light source modulation layer drive values;
- determining display modulation layer drive values, based at least in part on the expected luminance profile;
- comparing the display modulation layer drive values to a predetermined threshold maximum value and a predetermined threshold minimum value;
- flagging image regions for which any of the display modulation layer drive values are above the predetermined threshold maximum value or below the predetermined threshold minimum value;
- and
- based on the flagged image regions, adjusting a second set of light source modulation layer drive values for portions of a second frame of image data.
A display apparatus comprising:
- a display device comprising a light source modulation layer and a display modulation layer, the display device operable to display a first frame of image data;
- a processor operable to provide control signals to the display based on the first frame of image data, wherein the processor is configured to:
- determine light source modulation layer drive values based at least in part on the first frame of image data;
- determine an expected luminance profile at the display modulation layer, based at least in part on the light source modulation layer drive values;
- determine display modulation layer drive values, based at least in part on the expected luminance profile;
- scan the display modulation layer drive values for values that are above a predetermined threshold maximum value and below a predetermined threshold minimum value;
- flag image regions for which any of the display modulation layer drive values are above the predetermined threshold maximum value or below the predetermined threshold minimum value;
- and
- adjust the light source modulation layer drive values for portions of a second frame of image data.
A computer program product comprising a non-transitory medium encoded with computer-readable instructions that upon execution cause a data processor to perform operations comprising:
- receiving a first frame of image data;
- determining a first set of light source modulation layer drive values based at least in part on the first frame of image data;
- determining an expected luminance profile at the display modulation layer, based at least in part on the first set of light source modulation layer drive values;
- determining display modulation layer drive values, based at least in part on the expected luminance profile;
- comparing the display modulation layer drive values to a predetermined threshold maximum value and a predetermined threshold minimum value;
- flagging image regions for which any of the display modulation layer drive values are above the predetermined threshold maximum value or below the predetermined threshold minimum value;
- and
- based on the flagged image regions, adjusting a second set of light source modulation layer drive values for portions of a second frame of image data.
Dependencies are inferred from the claim text.