Optical element including an absorptive and reflective polarizer having particular orientation
First Claim
1. An optical element, comprising:
- an absorptive polarizer having an axis of absorption and an axis of transmission; and
a reflective polarizer positioned to face the absorptive polarizer and having an axis of reflection and an axis of transmission, wherein the reflection axis of the reflective polarizer and the transmission axis of the absorptive polarizer intersect at an angle between 15 and 25 degrees.
2 Assignments
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Accused Products
Abstract
The liquid crystal device of the present invention effectively prevents reversion of bright/dark states between a reflective display mode and a transmissive display mode. The liquid crystal device includes a first absorptive polarizer, which receives light from outside; a liquid crystal cell, which receives light emitted from the first absorptive polarizer; a second absorptive polarizer, which receives light emitted from the liquid crystal cell; and a reflective polarizer, which receives light emitted from the second absorptive polarizer. The reflective polarizer has an axis of reflection in a predetermined direction to reflect at least part of light that has been transmitted through the first absorptive polarizer, the liquid crystal cell, and the second absorptive polarizer to be incident on the reflective polarizer. The reflective polarizer partially transmits light including a linearly polarized light component which is included in light entering the reflective polarizer from an opposite side to the second absorptive polarizer and which is to be transmitted through the second absorptive polarizer. The first absorptive polarizer has an axis of transmission in a specific direction to cause light, which has been reflected by the reflective polarizer and transmitted through the second absorptive polarizer, to be transmitted through the first absorptive polarizer.
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Citations
10 Claims
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1. An optical element, comprising:
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an absorptive polarizer having an axis of absorption and an axis of transmission; and
a reflective polarizer positioned to face the absorptive polarizer and having an axis of reflection and an axis of transmission, wherein the reflection axis of the reflective polarizer and the transmission axis of the absorptive polarizer intersect at an angle between 15 and 25 degrees. - View Dependent Claims (2, 3)
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4. An optical element, comprising:
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a diffusing plate having at least two surfaces, each of the surfaces being opposite to the other;
an absorptive polarizer facing one of the surfaces and having an axis of absorption and an axis of transmission; and
a reflective polarizer facing the other of the surfaces and having an axis of reflection and an axis of transmission, wherein the reflection axis of the reflective polarizer and the transmission axis of the absorptive polarizer intersect at an angle between 15 and 25 degrees.
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5. An optical element, comprising:
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a retardation film having at least two surfaces, each of the surfaces being opposite to the other;
an absorptive polarizer facing one of the surfaces and having an axis of absorption and an axis of transmission; and
a reflective polarizer facing the other of the surfaces and having an axis of reflection and an axis of transmission, wherein the reflection axis of the reflective polarizer and the transmission axis of the absorptive polarizer intersect at an angle between 15 and 25 degrees.
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6. A liquid crystal display device, comprising:
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a liquid crystal layer;
a light source emitting light towards the liquid crystal layer; and
an optical element positioned between the liquid crystal layer and the light source, the optical element comprising;
an absorptive polarizer having an axis of absorption and an axis of transmission; and
a reflective polarizer positioned to face the absorptive polarizer and having an axis of reflection and an axis of transmission, wherein the optical element is disposed such that the absorptive polarizer faces the liquid crystal layer and the reflective polarizer faces the light source and the reflection axis of the reflective polarizer and the transmission axis of the absorptive polarizer intersect at an angle between 15 and 25 degrees. - View Dependent Claims (7, 8, 9, 10)
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Specification