Enhanced light-scattering display
First Claim
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1. A reflective display device comprising:
- a light incident side and an opposite side, the display device comprising a diffusing liquid crystalline material,a first substrate on the light incident side and a second substrate on the opposite side enclosing the liquid crystalline material,reflecting means between said first and second substrates which reflect light which is incident at an angle larger than a given angle of incidence and pass light which is incident at an angle smaller than said given angle of incidence,said display device further comprising an absorbing element which absorbs light passed by said reflecting means;
wherein said reflecting means comprises a first layer disposed on a second layer, wherein an interface between said first layer and said second layer is non planar, said first layer and said second layer having different indices of refraction;
wherein said second layer is disposed on a third layer, said third layer has a different index of reflection than said second layer; and
wherein said second layer has a higher index of refraction than said first and said third layers.
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Abstract
A combination of a relatively low backscatter diffuser with a specularly reflective or weakly scattering transducer to achieve the required front of screen properties for a paper-like display. The diffuser, which may be of the volume or surface relief type, in enclosed in the display cell. The transducer may be any one of several electro-optically active materials such as a liquid crystal, electrochromic or electrophoretic types.
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Citations
4 Claims
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1. A reflective display device comprising:
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a light incident side and an opposite side, the display device comprising a diffusing liquid crystalline material, a first substrate on the light incident side and a second substrate on the opposite side enclosing the liquid crystalline material, reflecting means between said first and second substrates which reflect light which is incident at an angle larger than a given angle of incidence and pass light which is incident at an angle smaller than said given angle of incidence, said display device further comprising an absorbing element which absorbs light passed by said reflecting means; wherein said reflecting means comprises a first layer disposed on a second layer, wherein an interface between said first layer and said second layer is non planar, said first layer and said second layer having different indices of refraction; wherein said second layer is disposed on a third layer, said third layer has a different index of reflection than said second layer; and wherein said second layer has a higher index of refraction than said first and said third layers. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeInternational Business Machines Corporation
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Original AssigneeInternational Business Machines Corporation
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InventorsLowe, Anthony Cyril
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Primary Examiner(s)Dudek, James A.
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Application NumberUS09/589,306Time in Patent Office2,365 DaysField of Search349/113, 349/84, 349/86US Class Current349/86CPC Class CodesG02F 1/133504 Diffusing, scattering, diff...G02F 1/133553 Reflecting elements associa...
