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- W2027249541 abstract "Reflective x-Si backplanes allow projection displays to evolve toward higher pixel count and greater miniaturization, extending the range of competitive application. As light valve area A is reduced, projector output into solid angle S equalsV (pi) NA<SUP>2</SUP> can in many cases be considered to decrease roughly as approximately (A*S)<SUP>0.5</SUP>, with the 0.5 exponent representing typical microdisplay operating in a regime that is neither purely brightness-limited nor purely power-limited. Polarization modulation entails a modified scaling approximately (A*S/2)<SUP>0.5</SUP>; color sequential operation, approximately (1/3)*(A*S)<SUP>0.5</SUP>; spatially divided single-light-valve RGB projection, approximately (A*S/3)<SUP>0.5</SUP>. Projection lenses for three-light-valve system must provide an increased working distance to accommodate a color recombiner. Zoom lens are often required in front projectors, and rear projection usually entails a short lens-to-screen distance. It has become cost-effective to use plastic aspherical elements to meet these requirements. Periodic strip-PBS arrays have been widely adopted for polarization recycling, but aperiodic homogenizers are sometimes used to correct the uneven magnification and symmetry limitations of conic reflectors. Bright-state and dark-state beams must occupy distinct etendues in the half space above a reflective light valve, creating a vulnerability to crosstalk. Crosstalk from a polarizing beamsplitter gives rise to a residual background intensity approximately 0.3*NA<SUP>2</SUP>, unless a quarterwave corrector is used. Crosstalk can also arise from stress birefringence in prism substrates. Stray light makes an indirect contribution to background, but can sometimes be corrected by filtering." @default.
- W2027249541 created "2016-06-24" @default.
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- W2027249541 date "1999-05-20" @default.
- W2027249541 modified "2023-09-27" @default.
- W2027249541 title "<title>Projection optics for reflective light valves</title>" @default.
- W2027249541 doi "https://doi.org/10.1117/12.349348" @default.
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