Dispersive holographic microlens matrix for single-LCD projection

Cecile Joubert; Brigitte Loiseaux; Anne Delboulbe; Jean-Pierre Huignard

doi:10.1117/12.237013

29 March 1996 Dispersive holographic microlens matrix for single-LCD projection

Cecile Joubert, Brigitte Loiseaux, Anne Delboulbe, Jean-Pierre Huignard

Proceedings Volume 2650, Projection Displays II; (1996) https://doi.org/10.1117/12.237013
Event: Electronic Imaging: Science and Technology, 1996, San Jose, CA, United States

Abstract

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.

Citation Download Citation

Cecile Joubert, Brigitte Loiseaux, Anne Delboulbe, and Jean-Pierre Huignard "Dispersive holographic microlens matrix for single-LCD projection", Proc. SPIE 2650, Projection Displays II, (29 March 1996); https://doi.org/10.1117/12.237013

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