Temporal dithering to increase dynamic range of images in sequentially illuminated displays
AssigneeKoninklijke Philips Electronics N.V.
InventorJohn E Dean
Life of this patent
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Abstract
A method of increasing image dynamic range by breaking each pixel into two or more time displaced samples that are presented to the display in synchronization with appropriate illumination.
Claims14
A method of increasing an image dynamic range of a pixel system by breaking each pixel into time displaced samples, comprising the steps of:
- providing a source of light L and splitting said light into a first band of luminance and a second band of luminance;
- sweeping said first band across a light valve;
- addressing said light valve with a first video information synchronous with the sweeping of said first band;
- sweeping said second band across said light valve approximately 180 degrees out of phase with said first band;
- and
- addressing said light valve with a second video information synchronous with the sweeping of said second band.
A video display pixel conversion system comprising:
- a source of bands of light L, said bands of light being separated from each other;
- light valve means for receiving said bands of light in accordance with an input video signal;
- means for moving a first one of said bands of light sequentially across said light valve means;
- means for moving a second one of said bands of light across said light valve means approximately 180 degrees out of phase with said first one of said bands of light;
- and
- means for addressing said light valve means with video information corresponding to the luminance of the light band imaging thereon so that said first one of said bands of light is received by said light valve means synchronous with a first video information and said second one of said bands of light is received by said light valve means synchronous with a second video information to combine the outputs thereof on said light valve means.
The video display pixel conversion system wherein said pixel system is a 12-bit pixel system, said first one of said band of light has a luminance of (m/256) L and said second one of said bands of light has a luminance of (n/256) L, where m+n=256.
Dependencies are inferred from the claim text.