Liquid crystal display device with write-in capability

Details Liquid crystal display device with write-in capability Liquid crystal display device with write-in capability

1980-12-12

1982-08-17

Waring, Alvin H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, 340765, G06F 302

Patent

active

043452485

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.

REFERENCES:
patent: 4104617 (1978-08-01), Bean et al.
patent: 4177354 (1979-12-01), Mathews

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