Liquid crystal display device with write-in capability
First Claim
1. A liquid crystal display device, comprising:
- means for generating a plurality of drive signals;
at least two substrates;
a layer of liquid crystal sandwiched between said substrates;
a plurality of electrodes formed upon said substrates;
a plurality of display elements controlled by said drive signals applied through said electrodes;
a plurality of switching elements provided upon a first one of said substrates;
a plurality of photoelectric elements provided upon said first one of said substrates; and
means for detecting variations in characteristics of said photoelectric elements resulting from changes in levels of light impinging thereon.
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Abstract
A novel type of liquid crystal display device is disclosed, whereby data can be written in, via the display device, by utilizing light-generating means such as a light pen. The display device is of matrix configuration, with a switching element being provided individually for each of the elements of the display matrix, and is characterized by a photoelectric element being provided for each display element, whereby data is written in. The discrimination circuit means whereby the statuses of the photoelectric elements are sensed, in a time sharing manner, can utilize the same row and column electrodes used to drive the switching elements of the display matrix, and the photoelectric elements can be formed during the same process, and upon the same substrate, as the switching elements.
197 Citations
15 Claims
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1. A liquid crystal display device, comprising:
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means for generating a plurality of drive signals; at least two substrates; a layer of liquid crystal sandwiched between said substrates; a plurality of electrodes formed upon said substrates; a plurality of display elements controlled by said drive signals applied through said electrodes; a plurality of switching elements provided upon a first one of said substrates; a plurality of photoelectric elements provided upon said first one of said substrates; and means for detecting variations in characteristics of said photoelectric elements resulting from changes in levels of light impinging thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification