Color-compensated information displays
First Claim
1. An optical device, comprising:
- an absorbing polarizer having a double pass color shift of |Δ
x|≦
0.005 and |Δ
y|≦
0.005 for illumination by a C-illuminant, and a double pass contrast modulation of at least 90%;
a liquid crystal display (LCD) layer disposed below the absorbing polarizer; and
a reflective layer disposed below the LCD layer to reflect back light through the LCD and the absorbing polarizer to form an image.
1 Assignment
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Accused Products
Abstract
A polarizer has low color shift and is particularly well suited to use in an LCD display. The polarizer has a double pass color shift of |Δx|≦0.005 and |Δy|≦0.005 for illumination by a C-illuminant, and a double pass contrast modulation of at least 90%. The display includes two or more layers stacked together, at least one of the layers being an absorbing polarizer having a double pass color shift of |Δx|≦0.005 and |Δy|≦0.005 for illumination by a C-illuminant. A polarizer with a selected color shift is also used with a rear projection screen having a dispersing layer stacked together with first absorbing polarizer. The polarizer has a single pass color shift with at least one of Δx and Δy being negative under illumination by a C-illuminant, and a polarization co-efficiency greater than 90%.
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Citations
33 Claims
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1. An optical device, comprising:
-
an absorbing polarizer having a double pass color shift of |Δ
x|≦
0.005 and |Δ
y|≦
0.005 for illumination by a C-illuminant, and a double pass contrast modulation of at least 90%;
a liquid crystal display (LCD) layer disposed below the absorbing polarizer; and
a reflective layer disposed below the LCD layer to reflect back light through the LCD and the absorbing polarizer to form an image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical device, comprising:
-
an absorbing polarizer having a double pass color shift of Δ
x≦
0.005 and Δ
y≦
0.002 and a double pass contrast modulation of at least 90% under illumination by an A-illuminant, and a double pass color shift of Δ
x≦
0.005 and Δ
y≦
0.005 under illumination by a C-illuminant;
a liquid crystal display (LCD) layer disposed below the absorbing polarizer; and
a reflective layer disposed below the LCD layer to reflect back light through the LCD and the absorbing polarizer to form an image. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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-
21. A device for displaying information, comprising:
two or more layers stacked together, at least one of the layers being an absorbing polarizer having a double pass color shift of |Δ
x|≦
0.005 and |Δ
y|≦
0.005 for illumination by a C-illuminant, and at least one of the layers including a liquid crystal display (LCD) layer disposed below the absorbing polarizer and a reflective layer disposed below the LCD layer to reflect back light through the LCD and the absorbing polarizer to form an image.- View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification