Diffraction grating type liquid crystal display device in viewfinder
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United States of America Patent
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Mar 29, 1994
Issued Date -
N/A
app pub date -
Jul 16, 1993
filing date -
Aug 7, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is provided a display device in a viewfinder, including a diffraction grating whose shape is determined at an interface between first and second materials, at least one of the first and second materials being adapted to have a variable refractive index for light reflected by an object to be photographed, and control means for changing the refractive index of the first and/or second materials, wherein the control means causes the light from the object to substantially pass through the diffraction grating in a first state and causes the diffraction grating to partially diffract the light from the object to display a pattern in a second state.
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