Method and apparatus for driving capacitive display device

Details Method and apparatus for driving capacitive display device Method and apparatus for driving capacitive display device

1991-07-26

1994-05-10

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340793, C09G 330

Patent

active

053111699

ABSTRACT:
This invention relates to gradation display by a pulse width control method (PWM method) in every pixel in a capacitive display apparatus such as a liquid crystal display apparatus. The driving voltage applied to the electrodes is varied slowly, and the number of gradations of gradation display by the PWM method is increased. Since the capacitive display apparatus is used, for each electrode further from the drive circuit, the driving pulse is more influenced and its persisting duration is extended. As a result, even in identical gradation data, uneven colors may occur. The pulse width applied to the electrodes is gradually decreased as scanning of the electrodes sequentially occurs. Therefore, the brightness of the capacitive display apparatus may be made uniform over the entire screen surface.

REFERENCES:
patent: 4554539 (1985-11-01), Graves
patent: 4755724 (1988-07-01), Wagner
patent: 4801933 (1989-01-01), Yamamoto et al.
patent: 4837566 (1989-06-01), Channing et al.
patent: 4897639 (1990-01-01), Kanayama
patent: 5017914 (1991-05-01), Uchida et al.
Gielow et al. article entitled: "Multiplex Drive of a Thin Film Panel"; SID 84 Digest; pp. 242-244.

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