Polarized light color filter and video projector comprising...

Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell

Reexamination Certificate

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Details

C349S106000, C353S020000, C359S250000, C359S253000, C359S256000, C359S259000

Reexamination Certificate

active

06876403

ABSTRACT:
A polarized light color filter for producing R, G and B primary lights from inputted white light in time division. The filter is small in size and strong against mechanical vibration. The projections of the R, G and B lights can be arbitrarily varied in one period. The varying speed is high, and the ratio of utilization of the quantity of light from the light source is high. Elements36(1),38(1),40(1),38(2),40(2),38(3),40(3),38(4) and36(2) are in order stacked and bonded between glass substrates (30, 32). The elements38(1) to38(4) are polarized light converting elements for selecting either a mode in which the inputted light is outputted as it is by applied voltage control or a mode in which the inputted light is converted from one polarized light to the other and outputted. The elements40(1) to40(3) are narrow-band polarization spectroscopic elements reflecting only the S-polarized components of the R, G and B lights and transmitting the other components. The elements36(1),36(2) are wide-band polarization spectroscopic elements transmitting the P-polarized components over the full visible range and reflecting the P-polarized components.

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