Field Sequential Display of Color Images
AssigneeThe University of British Columbia
InventorHelge Seetzen
Life of this patent
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Abstract
A color display has a monochrome modulator. An active area of the modulator is illuminated by an array of light sources. The light sources include light sources of three or more colors. The intensities of the light sources may be adjusted to project desired luminance patterns on an active area of the modulator. In a fast field sequential method different colors are projected sequentially. The modulator is set to modulate the projected luminance patterns to display a desired image. In a slow field sequential method, colors are projected simultaneously and the modulator is set to modulate most important colors in the image.
Claims55
A method for displaying images at a viewing area, the method comprising:
- providing an array comprising a plurality of groups of individually-controllable light sources, the light sources of each group emitting light of a corresponding one of a plurality of colors;
- driving the array in response to image data such that each of the groups projects a luminance pattern onto an active area of a modulator comprising a plurality of pixels;
- and,
- controlling the pixels of the modulator to selectively allow light from the active area to pass to the viewing area.
Apparatus for displaying images at a viewing area, the apparatus comprising:
- an array comprising a plurality of groups of individually-controllable light sources, the light sources of each group emitting light of a corresponding one of a plurality of colors;
- a modulator having an active area comprising a plurality of pixels, the active area illuminated by the array, each pixel controllable to vary a proportion of light incident on the active area that is passed to the viewing area;
- and,
- a control circuit configured to drive each of the groups of the light sources according to a control signal to project a luminance pattern onto the active area of the modulator, the luminance pattern for each of the groups having a variation in intensity over the active area.
55-56. (canceled)
Dependencies are inferred from the claim text.