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US3899786A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid crystal color display system

Assignee: Siemens AG
•
Filing: 1973-05-16
•
Granted: 1975-08-12
•
Expires: 1993-05-16
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Abstract

Abstract Apparatus for originating and displaying color data utilizing liquid crystal which can be selectively energized to produce desired colors and patterns wherein in one embodiment the pattern is determined by electrical signals applied to the liquid crystal at particular locations thus giving a display at such locations and in a second embodiment wherein light conducting fibers are utilized to excite a display means connected to their output ends and wherein colored light is applied to the other end of the fibers by selectively energizing liquid crystals. In the first embodiment, a plurality of colored stripped electrodes are mounted adjacent a planar liquid crystal such that when electrical potential is applied between one of the colored stripped electrodes and second electrodes on the other side of the crystal, the particular energized colored stripped electrode becomes visible. In the second embodiment, three separate liquid crystal devices are provided each of which have electrode energizing strips of different colors which can be energized to produce the particular colors and which are connected to a display unit by light conducting fibers.

Inventors

  • 👤 Waldemar Greubel
  • 👤 Hans Krueger
  • 👤 Ulrich Wolff

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 22:08
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/04; G09G3/16; G09G3/18; G09G3/20; G09G3/34; G09G3/3406

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 80 words
In an apparatus for presenting colored images comprising: a first light polarizing means, a second light polarizing means, a liquid crystal means mounted between first and second polarizing means, electrode energizing means, a plurality of transparent electrodes suitably mounted adjacent said crystal means such that said electrode energizing means produces a field across said liquid crystal wherein the improvement comprises an addition of at least one pigment to the transparent electrode material whereby a colored image may be selectively derived.
Claim 2
Dependent Claim 80 words
In an apparatus for presenting colored images comprising: a first light polarizing means, a second light polarizing means, a liquid crystal means mounted between first and second polarizing means, electrode energizing means, a plurality of transparent electrodes suitably mounted adjacent said crystal means such that said electrode energizing means produces a field across said liquid crystal wherein the improvement comprises an addition of at least one pigment to the transparent electrode material whereby a colored image may be selectively derived.
Claim 3
Dependent Claim 30 words
In an apparatus for presenting colored images according to claim 1 wherein said electrodes are divided into a plurality of interleaved groups and said pigments for each group are different.
Claim 4
Dependent Claim 45 words
In an apparatus for presenting colored images according to claim 1 wherein said electrodes are divided into groups each corresponding to a discrete area on the device and further including a display means and fiber optic means connecting said discrete areas to said display means.
Claim 5
Dependent Claim 17 words
In an apparatus for presenting colored images according to claim 3 wherein said groups comprise discrete devices.
Claim 6
Dependent Claim 34 words
In an apparatus for presenting colored images according to claim 4 wherein said fiber optic means terminate in a plurality of triads arranged over an area of said display means to produce a display.
Claim 7
Dependent Claim 71 words
In an apparatus according to claim 2 wherein said plurality of transparent electrodes are strip shaped and arranged parallel to each other and a second plurality of strip shaped electrodes connected to said electrode energizing means and arranged parallel to each other and extending at right angles to said pluraltiy of transparent electrodes of said liquid crystal means mounted between said plurality of transparent electrodes and said second plurality of electrodes.
Claim 8
Dependent Claim 33 words
In an apparatus according to claim 5 wherein said display means comprises an alphanumeric display having seven segments and the area over which said plurality of triads are arranged includes said seven segments.

References Cited (Backward Citations)

US3499702A Cited
US3576563A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-08-11 1979-02-10 1979-08-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-08-11 1983-02-10 1983-08-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-08-11 1987-02-10 1987-08-12 $7700.00 Window Closed / Lapsed

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