Liquid Crystal Display Device
AssigneeHewlett-Packard Development Company, L.P.
InventorsStephen Kitson, Mario Ariosto Matranga, Timothy Taphouse, Daniel M. Younger, Christopher Newton
Life of this patent
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Abstract
A reflective display device includes a pixel structure (200) and a liquid crystal (210) containing a dye. The pixel structure (200) provides the liquid crystal (210) with a first tilt state and a second tilt state that are stable absent application of an electric field. In the first tilt state, the liquid crystal (210) is in an untwisted configuration. In the second tilt state, the liquid crystal (210) is in a twisted configuration, and the dye has an effective absorption that is higher than an effective absorption of the dye when the liquid crystal (210) is in the first tilt state.
Claims15
A reflective display device comprising:
- a liquid crystal containing a dye;
- and
- a pixel structure containing the liquid crystal within a cell gap, wherein:
- the pixel structure provides the liquid crystal material with a first tilt state and a second tilt state that are stable absent application of an electric field;
- in the first tilt state, the liquid crystal is in an untwisted configuration;
- and
- in the second tilt state, the liquid crystal is in a twisted configuration in which the liquid crystal orients the dye to create a fingerprint pattern for absorption of light, and the dye has an effective absorption that is higher than an effective absorption of the dye when the liquid crystal is in the first tilt state.
A reflective display device comprising:
- a liquid crystal containing a dye;
- and
- a pixel structure containing the liquid crystal within a cell gap such that a ratio of the cell width to a helical pitch of the liquid crystal is greater than 0.8, wherein:
- the pixel structure provides the liquid crystal material with a first tilt state and a second tilt state that are stable absent application of an electric field;
- in the first tilt state, the liquid crystal is in an untwisted configuration;
- and
- in the second tilt state, the liquid crystal is in a twisted configuration, and the dye has an effective absorption that is higher than an effective absorption of the dye when the liquid crystal is in the first tilt state.
A process comprising:
- providing in a gap of a pixel structure a liquid crystal containing a dye;
- and
- applying an electric field to switch the liquid crystal in the pixel structure from a first stable tilt state to a second stable tilt state, wherein:
- in the first stable tilt state, the liquid crystal is in an untwisted configuration;
- and
- in the second stable tilt state, the liquid crystal is in a twisted configuration, and the dye has an effective absorption that is higher than an effective absorption of the dye when the liquid crystal is in the first stable state.
Dependencies are inferred from the claim text.