A MULTI-COLOR PROJECTION LCD
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A simulation method for the color design of a LCD projector is described in this paper with a goal to achieve better color performance, such as a larger color gamut and color saturation, enough brightness and adequate color temperature.
Gamut
Lightness
RGB color model
Color balance
Color depth
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Single-LCD projection is the simplest and most compact architecture for LCD projection. It is simply made of a lamp, a LCD with color filters and a projection lens. However it suffers from poor luminous efficiency due to color filter losses, since each filter transmits only about one third of the flux emitted by the lamp. We report a new bright single-LCD architecture based on innovative use of an holographic microlens matrix, which provides the spatio- chromatic illumination of the LCD. This specific component illuminates each LCD pixel with the primary color corresponding to the color video signal driving the pixel. Correct RGB spatial repartition is obtained by taking advantage of the holographic lens spectral dispersion. When illuminated by white light, the focus is spectrally spread out. This effect has been utilized to illuminate three adjacent LCD pixels within red, green and blue light, the LCD being located at the focal plane. The use of holographic microlens arrays allow the suppression of color filters and a compensation of LCD aperture ratio. Thus, this new compact single-LCD projection architecture ensures a flux gain factor above three compared to classical ones, as well as saturated primary colors compatible with high quality LCD video image projection.
Microlens
RGB color model
Color filter array
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Flat panel
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