Method for color correction of field sequential light valve projectors with line-at-a-time addressing
First Claim
1. A method of color correction for a single panel scrolling raster color projection system, the system having a single white light source, a single light valve panel, an element for separating the white light into two or more scrolling color bands, and a field-sequential, line-at-a-time addressing system, the method comprising the steps of:
- (a) setting the height in the scrolling direction of at least one of the color band(s) to be greater than the height of the panel in the scrolling direction, and setting the height of the remaining color bands to be at least substantially the same as the height of panel in the scrolling direction, so that the panel is substantially entirely illuminated by each color band at some instant of time during scrolling; and
(b) changing the power to the light source to increase or decrease the lumen output of the light source during the time period in which the panel is substantially entirely illuminated by a color band, thereby to increase or decrease the contribution of the color of the color band to the total lumen output of the system.
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Accused Products
Abstract
In a single panel scrolling raster projection system of the type having a single light source, a single light valve panel, a rotatable element having surface segments for separating the white light into color bands, and field-sequential, line-at-a-time addressing means, one or more of the color bands is sized to have a height in the scrolling direction greater than the height of the panel in the scrolling direction, and sizing the remaining bands to have a scrolling height substantially equal to that of the panel. Color correction is achieved by changing the power of the light source to increase or decrease its illumination during the period in which the panel is substantially entirely illuminated by a color band having a scrolling height greater than that of the panel, and/or by adjusting the scrolling heights of the color bands relative to one another.
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Citations
16 Claims
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1. A method of color correction for a single panel scrolling raster color projection system, the system having a single white light source, a single light valve panel, an element for separating the white light into two or more scrolling color bands, and a field-sequential, line-at-a-time addressing system, the method comprising the steps of:
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(a) setting the height in the scrolling direction of at least one of the color band(s) to be greater than the height of the panel in the scrolling direction, and setting the height of the remaining color bands to be at least substantially the same as the height of panel in the scrolling direction, so that the panel is substantially entirely illuminated by each color band at some instant of time during scrolling; and
(b) changing the power to the light source to increase or decrease the lumen output of the light source during the time period in which the panel is substantially entirely illuminated by a color band, thereby to increase or decrease the contribution of the color of the color band to the total lumen output of the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of color correction for a single panel scrolling raster color projection system, the system having a single white light source, a single light valve panel, an element for separating the white light into two or more scrolling color bands, and a field-sequential, line-at-a-time addressing system, the method comprising the steps of:
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(a) setting the height in the scrolling direction of at least one of the color band(s) to be greater than the height of the panel in the scrolling direction, and setting the height of the remaining color bands to be at least substantially the same as the height of panel in the scrolling direction, so that the panel is substantially entirely illuminated by each color band at some instant of time during scrolling; and
(b) adjusting the heights in the scrolling direction of one or more of the color band(s) relative to the other color band(s), thereby to increase or decrease the contribution of the color of the changed color band(s) to the total lumen output of the system. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification