Multi-tone level displaying method by bi-level display devices a

Details Multi-tone level displaying method by bi-level display devices a Multi-tone level displaying method by bi-level display devices a

1991-05-22

1993-06-01

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340784, G09G 320

Patent

active

052164179

ABSTRACT:
In a bi-level displaying device, dither signal trains Y.sub.0 to Y.sub.15 for displaying half tone levels are generated from signal trains for basic tone levels X.sub.0 to X.sub.16 and from a 1/2 dither pattern constituted by the same numbers of dots having different threshold values. Dither signal trains Z.sub.0 Z.sub.31 for displaying unequally divided intermediate tone levels are generated by the basic trains X.sub.0 to X.sub.16 from a 1/4 dither pattern and a 3/4 dither pattern which are associated with unequal numbers dots having the different threshold values. Since the unequally divided intermediate tone levels can be displayed easily, it becomes possible to get natural intermediate tone levels. A dither pattern having a reversed pattern is adopted so that twice the number of intermediate tone levels can be displayed. Hence, a total of 64 tone levels can be displayed to produce images with fine detail and high resolution.

REFERENCES:
patent: 3937878 (1976-02-01), Judice
patent: 4559535 (1985-12-01), Watkins et al.
patent: 4769713 (1988-09-01), Yasui
patent: 4808991 (1989-02-01), Tachiuchi et al.
patent: 4921334 (1990-05-01), Akodes
patent: 5053764 (1991-10-01), Barbier et al.

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