DISPLAY DEVICE INCLUDING PIEZOELECTRIC AND LIQUID CRYSTAL LAYERS
First Claim
Patent Images
1. A display device comprising:
- a piezoelectric layer;
first electrically conductive electrodes disposed on both sides of said piezoelectric layer;
a bistable liquid crystal layer disposed adjacent said piezoelectric layer; and
second electrically conductive electrodes disposed on both sides of said liquid crystal layer.
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Abstract
A display device includes a piezoelectric layer. First electrically conductive electrodes are disposed on both sides of the piezoelectric layer. A bistable liquid crystal layer is disposed adjacent the piezoelectric layer. Second electrically conductive electrodes are disposed on both sides of the liquid crystal layer. The liquid crystal layer can be addressed by electrically addressing the piezoelectric layer causing the piezoelectric layer to move into contact with the liquid crystal layer, changing the brightness of pixels of the liquid crystal layer.
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Citations
56 Claims
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1. A display device comprising:
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a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer; a bistable liquid crystal layer disposed adjacent said piezoelectric layer; and second electrically conductive electrodes disposed on both sides of said liquid crystal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A display device comprising:
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a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer; a bistable liquid crystal layer comprising cholesteric liquid crystal, wherein said liquid crystal layer is adjacent said piezoelectric layer and comprises a dispersion of said cholesteric liquid crystal in a polymer matrix; second electrically conductive electrodes disposed on both sides of said liquid crystal layer, at least one of said second electrodes being transparent; and drive electronics for applying a first voltage to said first electrodes and a second voltage to said second electrodes, wherein said first voltage is applied to said first electrodes at a magnitude that causes said piezoelectric film to change shape which in turn causes flow of said cholesteric liquid crystal, thereby driving a planar texture of said cholesteric liquid crystal, and wherein said second voltage is applied to said second electrodes at a magnitude that drives a focal conic texture of said cholesteric liquid crystal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A multiplexed driving scheme for driving a display device comprising:
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providing a display device comprising; a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer; a bistable liquid crystal layer comprising cholesteric liquid crystal, wherein said liquid crystal layer is adjacent said piezoelectric layer and comprises a dispersion of said cholesteric liquid crystal in a polymer matrix; second electrically conductive electrodes disposed on both sides of said liquid crystal layer, at least one of said second electrodes being transparent; drive electronics for applying a first voltage to said first electrodes and a second voltage to said second electrodes; and an array of pixels of said liquid crystal layer for displaying a digitally addressed image, said pixels being created by a matrix of electrodes obtained by patterning one of said first electrodes as one of columns or rows and the other of said first electrodes sandwiching said piezoelectric layer being unpatterned, one of said second electrodes being patterned as the other of columns or rows and the other of said second electrodes sandwiching said liquid crystal layer being unpatterned, wherein said rows and said columns are approximately orthogonal to one another, and said pixels being defined by an intersection of said rows and said columns; electrically driving said piezoelectric layer by driving said first electrodes one said column or said row at a time, each said driven column or row defining a line segment of the image, thereby causing said piezoelectric layer to change shape along said driven column or row which drives said planar texture of said liquid crystal layer; while said column or said row of said first electrodes is driven, simultaneously placing data on a corresponding line segment of said liquid crystal layer by applying data voltages to the other of said columns or rows of said second electrodes sandwiching said liquid crystal layer which drives said focal conic texture of said liquid crystal layer; whereby image data is therefore addressed to said liquid crystal layer one line at a time sequentially to create a full said image. - View Dependent Claims (50, 51)
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52. A multiplexed driving scheme for driving a display device comprising:
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providing a display device comprising; a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer, one of said first electrodes being patterned as columns or rows and the other of said first electrodes being unpatterned; a bistable liquid crystal layer comprising cholesteric liquid crystal, wherein said liquid crystal layer is adjacent said piezoelectric layer and comprises a dispersion of said cholesteric liquid crystal in a polymer matrix; second electrically conductive electrodes disposed on both sides of said liquid crystal layer, at least one of said second electrodes being transparent, one of said second electrodes being patterned as columns and the other of said second electrodes being patterned as rows; drive electronics for applying a first voltage to said first electrodes and a second voltage to said second electrodes; and an array of pixels for displaying a digitally addressed image, said pixels being created by a matrix of electrodes obtained by columns or rows of said first electrodes and the other of columns or rows of said second electrodes, wherein said rows and said columns are approximately orthogonal to one another, and said pixels being defined by an intersection of said rows and said columns; and electrically addressing an image on said display device by first driving each line on said liquid crystal layer to said planar texture by sequentially applying appropriate voltages to said columns or rows of said first electrodes and then placing a focal conic image on said liquid crystal layer with a planar background by applying voltages to said columns and rows of said second electrodes.
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53. A multiplexed driving scheme for driving a display device comprising:
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providing a display device comprising; a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer, where one of said first electrodes is patterned as rows and the other of said first electrodes is patterned as columns, said rows and said columns being substantially orthogonal to each other; a bistable liquid crystal layer comprising cholesteric liquid crystal, wherein said liquid crystal layer is adjacent said piezoelectric layer and comprises a dispersion of said cholesteric liquid crystal in a polymer matrix; second electrically conductive electrodes disposed on both sides of said liquid crystal layer, at least one of said second electrodes being transparent, wherein both of said second electrodes are unpatterned or one of said second electrodes is patterned as rows or columns; drive electronics for applying a first voltage to said first electrodes and a second voltage to said second electrodes; and an array of pixels of said liquid crystal layer for displaying a digitally addressed image, said pixels being created by a matrix of electrodes obtained by columns or rows of said first electrodes, wherein said pixels are defined by an intersection of said rows and said columns; electrically driving said piezoelectric layer by driving said first electrodes one said column or said row at a time, each said driven column or row defining a line segment of the image and by driving the other of said columns or said rows of said first electrodes with data voltages, thereby causing said piezoelectric layer to change shape along intersections of said driven columns and rows to drive a texture of said liquid crystal layer; whereby image data is therefore addressed to said liquid crystal layer one line at a time sequentially to create a full said image. - View Dependent Claims (54)
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55. A display device comprising:
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a piezoelectric layer; first electrically conductive electrodes disposed on both sides of said piezoelectric layer, at least one of said first electrodes being patterned; a writing tablet comprising; a flexible substrate; a bistable liquid crystal layer comprising cholesteric liquid crystal, said liquid crystal layer being disposed between said piezoelectric layer and said substrate, wherein said liquid crystal layer comprises a dispersion of said cholesteric liquid crystal in a polymer matrix; second electrically conductive electrodes disposed on both sides of said cholesteric layer, at least one of said second electrodes being transparent; wherein a texture of said cholesteric liquid crystal is changed by application of pressure to said substrate; and drive electronics for applying a first voltage pulse to said first electrodes and a second voltage pulse to said second electrodes, wherein said first voltage pulse is applied to said first electrodes at a magnitude that causes said piezoelectric film to change shape which in turn causes flow of said cholesteric liquid crystal, thereby driving a light reflective planar texture of said cholesteric liquid crystal, and wherein said second voltage pulse is applied to said second electrodes at a magnitude that drives a focal conic texture of said cholesteric liquid crystal. - View Dependent Claims (56)
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Specification