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US 2020/0050075 A1Published application
Switchable light-collimating layer including bistable electrophoretic fluid
AssigneeE Ink California, LLC
InventorsCraig LIN, Xiaolong ZHENG, Yih-Ming KANG, HongMei ZANG
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Abstract
A switchable light-collimating film can be used as a privacy filter for computer monitors or other display devices. The film comprises a plurality of elongated chambers having pigment particles, the position of which can be controlled by the applied electric field. Distribution of the pigment particles throughout the elongated chambers, as opposed to their concentration on one side of the chambers, narrows the viewing angle to the light passing through the film and provides privacy of the viewing images to the user.
Claims22
A switchable light-collimating film comprising:
- a first light-transmissive electrode layer;
- a collimating layer having a thickness of at least 20 μm, and comprising a plurality of elongated chambers, each elongated chamber having an opening;
- a bistable electrophoretic fluid comprising pigment particles disposed in each elongated chamber;
- a sealing layer that seals the bistable electrophoretic fluid within at least one of the plurality of elongated chambers by spanning the opening of the elongated chamber;
- and
- a second light-transmissive electrode layer, wherein the first and second light-transmissive layers are disposed on either side of the collimating layer.
3 more elements
A display comprising:
- a light source;
- a switchable light-collimating film comprising:
- a first light-transmissive electrode layer,
- a collimating layer having a thickness of at least 20 μm, and comprising a plurality of elongated chambers, each elongated chamber having an opening,
- a bistable electrophoretic fluid comprising pigment particles disposed in each elongated chamber,
- a sealing layer that seals the bistable electrophoretic fluid within an elongated chamber by spanning the opening, and
- a second light-transmissive electrode layer, wherein the first and second light-transmissive layers are disposed on either side of the collimating layer;
- an active matrix of thin film transistors;
- a liquid crystal layer;
- and
- a color filter array.
8 more elements
Dependencies are inferred from the claim text.