Light blocking and cell spacing for liquid crystal matrix displays
First Claim
1. A liquid crystal display comprising:
- a pair of flat substrate, at least one of which is transparent;
a quantity of liquid crystal material disposed and contained between said substrates;
an array of pixel electrodes disposed on said at least one substrate;
at least one ground plane electrode disposed on the other use of said substrates, so that liquid crystal material is disposed between said pixel electrodes and said ground plane electrode, with said at least one ground plane electrode and said array of pixel electrodes being transparent;
an array of amorphous silicon semiconductor switch elements associated with said pixel electrodes;
a set of electrically conductive data lines;
a set of electrically conductive gate lines, said switch elements, said data lines and said gate lines being electrically connected to permit voltages appearing on said data lines to be applied to select pixel electrodes in accordance with signals present on said gate lines; and
cured photopatterned polyimide light blocking spacer material disposed between said substrates so as to determine the distance between said substrates and disposed so as to block light from said semiconductor switch elements.
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Accused Products
Abstract
Light blocking spacer material is disposed so as to at least partially cover the data and/or gate lines in a variety of liquid crystal display (LCD) devices. The material prevents spurious visual information from being displayed as a result of high RMS supply voltages applied to the data lines, such voltages acting to switch liquid crystal material at inopportune times and to thus degrade the displayed image. The light blocking material also enhances the displayed image by acting as a spacer between the front and back LCD device panels to insure uniform cell spacing. Light blocking material is also employed at the same time to prevent light from reaching light sensitive thin film field effect transistors (FETs) which operate to switch each cell or to establish gray levels therein. The light otherwise has a tendency to discharge the LCD cell, also hampering device function.
142 Citations
36 Claims
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1. A liquid crystal display comprising:
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a pair of flat substrate, at least one of which is transparent; a quantity of liquid crystal material disposed and contained between said substrates; an array of pixel electrodes disposed on said at least one substrate; at least one ground plane electrode disposed on the other use of said substrates, so that liquid crystal material is disposed between said pixel electrodes and said ground plane electrode, with said at least one ground plane electrode and said array of pixel electrodes being transparent; an array of amorphous silicon semiconductor switch elements associated with said pixel electrodes; a set of electrically conductive data lines; a set of electrically conductive gate lines, said switch elements, said data lines and said gate lines being electrically connected to permit voltages appearing on said data lines to be applied to select pixel electrodes in accordance with signals present on said gate lines; and cured photopatterned polyimide light blocking spacer material disposed between said substrates so as to determine the distance between said substrates and disposed so as to block light from said semiconductor switch elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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11. The display of claim 11 in which said light blocking spacer material exhibits an optical density greater than 3.
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31. A liquid crystal display comprising:
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a pair of flat substrates, at least one of which is transparent; a quantity of liquid crystal material disposed and contained between said substrates; an array of pixel electrodes disposed on said at least one substrate; at least one ground plane electrode disposed on the other one of said substrate, so that liquid crystal material is disposed between said pixel electrodes and said ground plane electrode, with said at least one ground plane electrode and said array of pixel electrodes being transparent; an array of amorphous silicon semiconductor switch elements associated with said pixel electrodes; a set of electrically conductive data lines; a set of electrically conductive gate lines, said switch elements, said data lines and said gate lines being electrically connected to permit voltages appearing on said data lines to be applied to select pixel electrodes in accordance with signals present on said gate lines; and cured photopatterned polyimide light blocking spacer material disposed so as to at least partially cover said data lines or said gate lines. - View Dependent Claims (32)
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33. A liquid crystal display comprising:
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a pair of flat substrates, at least one of which is transparent; a quantity of liquid crystal material disposed and contained between said substrates; an array of pixel electrodes disposed on said at least one substrate; at least one ground plane electrode disposed on the other one of said substrates, so that liquid crystal material is disposed between said pixel electrodes and said ground plane electrode, with said at least one ground plane electrode and said array of pixel electrodes being transparent; an array of amorphous silicon semiconductor switch elements associated with said pixel electrodes; a set of electrically conductive data lines, each of said data lines being partially duplicated along its length, respectively, so as to form a redundant conductive structure; a set of electrically conductive gate lines, said switch elements, said data lines and said gate lines being electrically connected to permit voltages appearing on said data lines to be applied to select pixel electrodes in accordance with signal patterns present on said gate lines; and cured photopatterned polyimide light blocking spacer material disposed so as to at least partially cover said data lines or said gate lines. - View Dependent Claims (34, 36)
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35. A liquid crystal display comprising:
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a pair of flat substrate, at least one of which is transparent; a quantity of liquid crystal material disposed and contained between said substrates; an array of pixel electrodes disposed on said at least one substrate; at least one ground plane electrode disposed on the other one of said substrates, so that liquid crystal material is disposed between said pixel electrodes and said ground plane electrode, with said at least one ground plane electrode and said array of pixel electrodes being transparent; an array of amorphous silicon semiconductor switch elements associated with said pixel electrodes; a set of electrically conductive data lines, each of said data lines being partially duplicated along its length, respectively, so as to form a redundant conductive structure; a set of electrically conductive gate lines, said switch elements, said data lines and said gate lines being electrically connected to permit voltages appearing on said data lines to be applied to select pixel electrodes in accordance with signal patterns present on said gate lines; and a cured photopatterned polyimide light blocking material disposed so as to at least partially cover said data lines or said gate lines.
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Specification