Liquid crystal display with pen-input capability

Details Liquid crystal display with pen-input capability Liquid crystal display with pen-input capability

1991-12-06

1993-09-07

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 60, 359 85, 345182, G02F 1133

Patent

active

052434524

ABSTRACT:
In a liquid-crystal display, each pixel is associated with a sensor which detects incoming light projected by a light pen. In response to the detected light, the sensor produces a signal which causes its associated pixel to darken. Thus, as a user moves the light pen along the display, the pen leaves a trail of darkened pixels, analogous to a pen leaving a trail of ink on paper.

REFERENCES:
patent: 4583087 (1986-04-01), Van de Venne
patent: 4655552 (1987-04-01), Togashi et al.
patent: 4715685 (1987-12-01), Yaniv et al.
patent: 4719457 (1988-01-01), Kitajima et al.
patent: 4723836 (1988-02-01), Komo et al.
patent: 4767192 (1988-08-01), Chang et al.
patent: 5064275 (1991-11-01), Tsunoda et al.

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