Display device with a light valve operated in a time division mu

Details Display device with a light valve operated in a time division mu Display device with a light valve operated in a time division mu

1979-02-23

1981-05-05

Bauer, Edward S.

350337, 350338, 350339D, G02F 1133

Patent

active

042655161

ABSTRACT:
A display device includes a light valve that is operated in a time division multiplex method and a fluorescent plate. The light valve may be a liquid crystal with a steep gradient of the contrast-voltage curve so that more multiplex steps are possible. One method of increasing this gradient is to allow only light from a narrow defined spatial angle range to pass through the light valve. In order to produce the narrow light cone that is desired, the invention proposes utilizing a diffusingly reflective layer, which extends parallel to a surface of the fluorescent plate at a finite distance and preferably, the light outlet or exit window of the plate is a surface provided with a dielectric multiple layer which allows the fluorescent light to emerge only in relatively limited spatial angle range. Preferably, these surfaces are the narrow edges of the fluorescent plate.

REFERENCES:
patent: 4142781 (1979-03-01), Baur et al.
Keil "Design Principles of Fluorescence Radiation Converters", Nuclear Instruments and Methods, (1970), pp. 111-123.

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