Reflective liquid crystal display with improved contrast
First Claim
1. A display comprising:
- a light modulating element;
a polarizer located on a first side of the light modulating element;
a reflective element located on a second side of the light modulating element; and
an optical element that is;
located between the light modulating element and the polarizer;
includes a first side facing the polarizer, and a second side facing the light modulating element; and
is adopted to;
receive a first pencil of light characterized by a first angle at the first side, and in response to receiving the first pencil of light, output a second pencil of light that is characterized by a second angle and includes a substantial portion of light from the first pencil of light at the second side;
receive a third pencil of light that is characterized by a third angle at the second side, and in response to receiving the third pencil of light output a fourth pencil of light that is characterized by a fourth angle and includes a substantial portion of light from the third pencil of light at the first side, wherein the first angle differs in magnitude from the fourth angle.
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Accused Products
Abstract
A display (200) includes a slanted fringe volume hologram (206) or other optical element that steers light that passes into and out of the display (200) so as to provide angular separation between unmodulated scattered light and modulated reflected light. As a result of the angular separation the effective contrast of the display (200) is improved. By placing the slanted fringe volume hologram (206) below a front polarizer of the display a further reduction in the amount of unmodulated scatter light is achieved. The slanted fringe volume hologram is preferably a hologram of a diffusive object (328), and consequently exhibits a degree of light diffusion that results in a viewing zone of an appreciable angular extent.
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Citations
20 Claims
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1. A display comprising:
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a light modulating element;
a polarizer located on a first side of the light modulating element;
a reflective element located on a second side of the light modulating element; and
an optical element that is;
located between the light modulating element and the polarizer;
includes a first side facing the polarizer, and a second side facing the light modulating element; and
is adopted to;
receive a first pencil of light characterized by a first angle at the first side, and in response to receiving the first pencil of light, output a second pencil of light that is characterized by a second angle and includes a substantial portion of light from the first pencil of light at the second side;
receive a third pencil of light that is characterized by a third angle at the second side, and in response to receiving the third pencil of light output a fourth pencil of light that is characterized by a fourth angle and includes a substantial portion of light from the third pencil of light at the first side, wherein the first angle differs in magnitude from the fourth angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display comprising:
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a layer of liquid crystal material;
a polarizer located on a first side of the layer of liquid crystal material; and
a slanted fringe volume hologram located between the layer of liquid crystal material and the polarizer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A handheld device comprising:
liquid crystal display including;
a layer of liquid crystal material;
a polarizer located on a first side of the layer of liquid crystal liquid crystal; and
a slanted fringe volume hologram located between the layer of liquid crystal material and the polarizer. - View Dependent Claims (19, 20)
Specification