Waveforms on a liquid crystal display

Details Waveforms on a liquid crystal display Waveforms on a liquid crystal display

1984-10-02

1987-09-01

Evans, Arthur G.

350332, G02F 113

Patent

active

046905090

ABSTRACT:
Liquid crystal display for use in an oscilloscope. Analog multiplexing techniques enable displaying of waveforms of input signals with frequencies as high as 1 MHz. An xy grid is formed by two interleaved arrays of alternate parallel transparent electrodes. Use of liquid crystal material results in very low power consumption and voltage threshold, improved lifetime, a wide viewing angle, and no image washout at high ambient light levels. Addition of a digital voltmeter, frequency counter, auto sync circuitry, dual trace, and movable cursor expands the capabilities of the display. A gray scale surrounds the actual null points on the display, allowing suitable resolution with a minimum of channels.

REFERENCES:
patent: 3322485 (1967-05-01), Williams
patent: 3807831 (1974-04-01), Soref
patent: 3820875 (1974-06-01), Bohmer
patent: 3834794 (1974-09-01), Soref
patent: 4510444 (1985-04-01), Haussel et al.
patent: 4548474 (1985-10-01), Nagae et al.

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