Dark state light recycling film and display
First Claim
1. A liquid crystal display comprising:
- (a) a backlight unit for providing substantially unpolarized illumination;
(b) a rear polarizer disposed proximate the backlight unit for receiving the incident substantially unpolarized illumination and transmitting substantially polarized illumination;
(c) a liquid crystal spatial light modulator for forming a display beam by selective, pixel-wise modulation of the polarization of the substantially polarized illumination; and
, (d) a reflective polarizer disposed between the liquid crystal spatial light modulator and a front polarizer, the reflective polarizer reflecting a portion of dark state light back toward the backlight unit.
2 Assignments
0 Petitions
Accused Products
Abstract
A liquid crystal device display (20) has a backlight unit (56) for providing substantially unpolarized illumination, a rear polarizer (50b) disposed proximate the backlight unit (56) for receiving the incident substantially unpolarized illumination and transmitting substantially polarized illumination, a liquid crystal spatial light modulator for forming a display beam by selective, pixel-wise modulation of the polarization of the substantially polarized illumination, and a reflective polarizer (52a) disposed between the liquid crystal spatial light modulator and a front polarizer (50a), the reflective polarizer (52a) reflecting a portion of dark state light back toward the backlight unit (56).
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Citations
31 Claims
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1. A liquid crystal display comprising:
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(a) a backlight unit for providing substantially unpolarized illumination;
(b) a rear polarizer disposed proximate the backlight unit for receiving the incident substantially unpolarized illumination and transmitting substantially polarized illumination;
(c) a liquid crystal spatial light modulator for forming a display beam by selective, pixel-wise modulation of the polarization of the substantially polarized illumination; and
,(d) a reflective polarizer disposed between the liquid crystal spatial light modulator and a front polarizer, the reflective polarizer reflecting a portion of dark state light back toward the backlight unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A liquid crystal display comprising:
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(a) a backlight unit providing substantially unpolarized illumination;
(b) a first reflective polarizer, having a transmission axis, for (i) transmitting that portion of light from the substantially unpolarized backlight unit illumination that has polarization parallel to the transmission axis; and
,(ii) reflecting light having a polarization orthogonal to the transmission axis;
(c) a rear polarizer for receiving the polarized light transmitted from the first reflective polarizer;
(d) a liquid crystal spatial light modulator for forming an image by selective, pixel-wise modulation of polarization of the polarized illumination; and
,(e) a second reflective polarizer disposed between the liquid crystal spatial light modulator and a front polarizer for reflecting a portion of dark state light from the liquid crystal spatial light modulator back toward the backlight unit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for adjusting display brightness comprising:
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a) providing backlight illumination to a transmissive liquid crystal display component;
b) forming an image beam by pixel-wise modulation of the polarization of the backlight illumination according to image data;
c) disposing a reflective polarizer in the path of the image beam;
d) determining, based on the image data, the relative proportion of dark pixels to light pixels; and
,e) modulating the backlight illumination brightness level based on the relative proportion of dark to light pixels for the displayed image. - View Dependent Claims (30, 31)
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Specification