Electronic device and LC shutter for polarization-sensitive switching between transparent and diffusive states
First Claim
1. An LC shutter comprising:
- a first dichroic polarizer;
a specular reflective polarizer;
an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer;
an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and
wherein a transmission axis of the in-plane anisotropic diffuser and the specular reflective polarizer are aligned with each other.
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Accused Products
Abstract
An electronic device (200) includes a display (202) and an LC shutter (204), at least a portion of which is operatively positioned over the display (202). The LC shutter (204) provides switching between a transparent state and a diffusive state with high image integrity, and high transmission in the transparent state. In one embodiment, the electronic device (200) further includes control logic (206) operatively coupled to the LC shutter (204) to provide control signals (212) to the LC shutter (204) to effect the transparent state. The LC shutter (204) includes a first dichroic polarizer (300), such as a broadband dichroic polarizer, a specular reflective polarizer (302), such as a broadband reflective polarizer, an LC cell (304), and a diffusive reflective polarizer (306). The LC cell (304) is interposed between the first dichroic polarizer (300) and the specular reflective polarizer (302). The diffusive reflective polarizer (306) is interposed between the LC cell (304) and the specular reflective polarizer (302). Related methods are also set forth.
133 Citations
26 Claims
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1. An LC shutter comprising:
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a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and wherein a transmission axis of the in-plane anisotropic diffuser and the specular reflective polarizer are aligned with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An LC shutter comprising:
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a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and a second dichroic polarizer that is a narrowband dichroic polarizer interposed between the in-plane anisotropic diffuser and the specular reflective polarizer, and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a broadband specular reflective polarizer. - View Dependent Claims (9)
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10. An LC shutter comprising:
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a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and a second dichroic polarizer that is a narrowband dichroic polarizer interposed between the LC cell and the in-plane anisotropic diffuser, and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a broadband specular reflective polarizer. - View Dependent Claims (11)
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12. An electronic device comprising:
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a display operative to emit light; and at least a portion of an LC shutter operatively positioned over the display, and wherein the LC shutter further comprises; a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and wherein a transmission axis of the in-plane anisotropic diffuser and the specular reflective polarizer are aligned with each other. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. An LC shutter comprising:
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a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a narrowband specular reflective polarizer. - View Dependent Claims (20)
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21. An electronic device comprising:
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a display operative to emit light; at least a portion of an LC shutter operatively positioned over the display, and wherein the LC shutter further comprises; a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and a second dichroic polarizer that is a narrowband dichroic polarizer interposed between the in-plane anisotropic diffuser and the specular reflective polarizer, and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a broadband specular reflective polarizer. - View Dependent Claims (22)
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23. An electronic device comprising:
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a display operative to emit light; at least a portion of an LC shutter operatively positioned over the display, and wherein the LC shutter further comprises; a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and a second dichroic polarizer that is a narrowband dichroic polarizer interposed between the LC cell and the in-plane anisotropic diffuser, and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a broadband specular reflective polarizer. - View Dependent Claims (24)
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25. An electronic device comprising:
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a display operative to emit light; at least a portion of an LC shutter operatively positioned over the display, and wherein the LC shutter further comprises; a first dichroic polarizer; a specular reflective polarizer; an LC cell interposed between the first dichroic polarizer and the specular reflective polarizer; an in-plane anisotropic diffuser interposed between the LC cell and the specular reflective polarizer; and wherein the first dichroic polarizer is a broadband dichroic polarizer and the specular reflective polarizer is a narrowband specular reflective polarizer. - View Dependent Claims (26)
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Specification