Method and device for controlling a matrix screen displaying gra

Details Method and device for controlling a matrix screen displaying gra Method and device for controlling a matrix screen displaying gra

1989-06-14

1991-12-24

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340505, G09G 300

Patent

active

050756834

ABSTRACT:
A process and device for controlling a matrix screen displaying gray levels, wherein during the line time T activation signals are delivered to the columns of the screen for a time depending on the gray level i of the image point in question and equal to (T/N).Nil, where O.ltoreq.i.ltoreq.m.ltoreq.N, the Nils forming a strictly increasing sequence of i of first term zero and of last term lower than or equal to N, the Nils being so selected as to obtain a predetermined distribution for the light intensities of the different gray levels.
Application to the control of microdot or liquid crystal matrix screens.

REFERENCES:
patent: 4193095 (1980-03-01), Mizushima
patent: 4554539 (1985-11-01), Graves
patent: 4841294 (1989-06-01), Clerc
patent: 4921334 (1990-05-01), Akodes

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