Display system

Details Display system Display system

1989-09-22

1991-10-22

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

340814, 340717, G09G 502

Patent

active

050599623

ABSTRACT:
A display system for converting first gray level signals of N bits/dot each, representing 2.sup.N gray levels, to second gray level signals of M bits/dot each, representing 2.sup.M gray levels, where N is an integer larger than or equal to 2 and M is an integer satisfying N>M.gtoreq.1, by separating each of the first gray level signals of N bits into higher M bits and lower N-M bits and respectively using the N-M bit values to select an appropriate table from among 2.sup.N-M tables, each of which stores a distinctive set of P.times.Q modification values satisfying P.times.Q.gtoreq.2.sup.N-M, then respectively adding the M bits and each of the modification values of said selected table to generate P.times.Q second gray level signals, and supplying the resulting second gray level signals to a display device of 2.sup.M gray levels. The first gray level signals may be supplied to a display device of 2.sup.N gray levels having a smaller number of display dots than the display device of 2.sup.M gray levels.

REFERENCES:
patent: 3937878 (1976-02-01), Judice
patent: 4006298 (1977-02-01), Fowler et al.
patent: 4558370 (1985-12-01), Mitchell et al.
patent: 4855728 (1989-08-01), Mano et al.
patent: 4937677 (1990-06-01), Van Dorsselaer

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