Achromatic polarization inverters for displaying inverse frames in DC balanced liquid crystal displays
First Claim
1. A display, comprising:
- a polarizer;
a reflective pixelated ferroelectric liquid crystal panel with a single pass retardance of a quarter-wave, wherein an optic axis orientation of each pixel of the reflective pixelated ferroelectric liquid crystal panel is switchable between a first orientation +α
2 and a second orientation −
α
2; and
a ferroelectric liquid crystal retarder, positioned between the polarizer and the reflective pixelated ferroelectric liquid crystal panel, with an optic axis switchable between a first orientation +α
1 and a second orientation −
α
1, and with a single-pass retardance of a half-wave.
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Abstract
This invention provides achromatic compound retarders, achromatic polarization switches, and achromatic shutters using the liquid crystal compound retarders. It further provides achromatic variable retardance smectic and nematic liquid crystal retarders. The achromatic compound retarders according to the invention are used to create achromatic inverters for display applications. The display comprises one or more retarders having in-plane retardance and in-plane orientation, at least one of the retarders being an actively controlled liquid crystal retarder, and a ferroelectric liquid crystal display, wherein the one or more retarders work in combination with the ferroelectric liquid crystal display to provide four states of brightness.
96 Citations
29 Claims
-
1. A display, comprising:
-
a polarizer;
a reflective pixelated ferroelectric liquid crystal panel with a single pass retardance of a quarter-wave, wherein an optic axis orientation of each pixel of the reflective pixelated ferroelectric liquid crystal panel is switchable between a first orientation +α
2 and a second orientation −
α
2; and
a ferroelectric liquid crystal retarder, positioned between the polarizer and the reflective pixelated ferroelectric liquid crystal panel, with an optic axis switchable between a first orientation +α
1 and a second orientation −
α
1, and with a single-pass retardance of a half-wave.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A reflective display, comprising:
-
a polarizer;
a reflective pixelated ferroelectric liquid crystal panel with a single pass retardance of a quartet-wave, wherein an optic axis orientation of each pixel of the reflective pixelated ferroelectric liquid crystal panel is switchable between first and second orientations; and
a first nematic liquid crystal retarder, positioned between the polarizer and the reflective pixelated ferroelectric liquid crystal panel, with a single-pass retardance switchable between approximately zero and approximately a half-wave. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
a first passive retarder, positioned between the polarizer and the first nematic liquid crystal retarder, with a single-pass retardance of approximately a quarter-wave; and
a second passive retarder, positioned between the first nematic liquid crystal retarder and the reflective pixelated ferroelectric liquid crystal panel, with a single-pass retardance of approximately a quarter-wave.
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-
23. The reflective display of claim 22, wherein an optic axis orientation of the first passive retarder is orthogonal to an optic axis orientation of the second passive retarder.
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24. A transmissive display, comprising:
-
an input polarizer;
an output polarizer;
a transmissive pixelated ferroelectric liquid crystal panel, positioned between the input and output polarizers, with a single-pass retardance of approximately a half-wave, wherein an optic axis orientation of each pixel of the transmissive ferroelectric liquid crystal panel is switchable between a first orientation +α
2 and −
α
2;
a first ferroelectric liquid crystal retarder, positioned between the input polarizer and the transmissive pixelated ferroelectric liquid crystal panel, with an optic axis switchable between a first orientation +α
1 and a second orientation −
α
1, and with a single-pass retardance of approximately a half-wave; and
a second ferroelectric liquid crystal retarder, positioned between the transmissive pixelated ferroelectric liquid crystal panel and the output polarizer, with an optic axis switchable between a first orientation +α
1 and a second orientation −
α
1, and with a single-pass retardance of approximately a half-wave.- View Dependent Claims (25, 26, 27)
-
-
28. A display, comprising:
-
a pixelated ferroelectric liquid crystal panel with a single pass retardance of either a quarter-wave or a half-wave, wherein an optic axis orientation of each pixel of the pixelated ferroelectric liquid crystal panel is switchable between first and second orientations; and
at least one ferroelectric or nematic liquid crystal retarder optically coupled to the pixelated ferroelectric liquid crystal panel, wherein an optic axis orientation or a single pass retardance of the at least one ferroelectric or nematic liquid crystal retarder is switchable between first and second orientations or first and second values, respectively.
-
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29. A reflective display, comprising:
-
a reflective pixelated ferroelectric liquid crystal panel with a single pass retardance of a quarter-wave, wherein an optic axis orientation of each pixel of the reflective pixelated ferroelectric liquid crystal panel is switchable between first and second orientations; and
a first ferroelectric or nematic liquid crystal retarder optically coupled to the reflective pixelated ferroelectric liquid crystal panel, wherein an optic axis orientation or a single pass retardance of the at least one ferroelectric or nematic liquid crystal retarder is switchable between first and second orientations or first and second values, respectively.
-
Specification