Optical filter made of inorganic material for red light
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United States of America Patent
Stats
-
Dec 2, 1986
Grant Date -
N/A
app pub date -
Jun 17, 1985
filing date -
Jun 20, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical filter made of inorganic material for red light which transfers red light and absorbs all of the other colored lights can be realized by sticking an inorganic mixture powder pasted by mixing with screen oil on a glass substrate and firing it. The mixture includes sulfates of copper, alkali metal and alkali earth metal. The contrast of the picture displayed on a display device can be increased significantly by reducing the reflection of incident ambient light without the reduction of brightness on account of the application of the above optical filter onto the displaying screen thereof.
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