Liquid crystal cell
AssigneeScreen Technology Limited
InventorsWilliam Alden Crossland, Anthony Bernard Davey, Vincent Glenn Geake, Ian David Springle
Life of this patent
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Abstract
A display device includes a shutter layer of liquid-crystal material arranged in cells to shutter input light selectively, a cover layer 5 on the shutter layer, and a set of phosphors 7 on the cover layer, corresponding to the cells, to be activated by the input light and provide the display image. To prevent crosstalk the active cell areas 10 defined by the electrode overlaps are smaller than the corresponding phosphors. This prevents crosstalk between cells even when input light that is not fully collimated is used and also allows space for thicker and/or broader electrodes 12 leading to the cells, reducing resistance, and for other components such as TFTs.
Claims7
A display device including a shutter layer of liquid crystal material arranged in cells to shutter input light selectively, a pair of electrodes in each cell for addressing the liquid crystal to cause the shuttering, the electrodes defining between them an active area;
- a cover layer on the shutter layer, and a set of output elements on the cover layer, corresponding to the cells, to be activated by the input light and provide the display image;
- the device further including a light source arranged so that the input light is incident on the device at angles varying over a maximum angular range θx from the normal;
- in which the active liquid-crystal area in each cell lies within the area of the corresponding output element, as seen normally to the cell;
- and in which θx approximately satisfies the relation
- θx=arctan[(y+n/2t)]
- where y is the spacing between adjacent active areas and t is the thickness of the cover layer and n is the lateral separation of phosphor dots.
Dependencies are inferred from the claim text.