Method and apparatus for driving display apparatus

Details Method and apparatus for driving display apparatus Method and apparatus for driving display apparatus

1989-12-27

1994-05-03

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

359 56, 359 84, 345208, G09G 336

Patent

active

053091507

ABSTRACT:
In accordance with the invention, gradation display is performed for each picture element in capacitive display apparatuses such as EL display apparatus by means of pulse width modulation. In doing so, pulse duration of the voltage applied to one group of electrodes among the a plurality of electrodes arranged in matrix is so set as to span over two scanning periods, during which another group of electrodes which are grouped into pairs each of two adjacent lines are scanned successively. This reduces the number of drive voltage charge and discharge cycles. Consequently power consumption of the display apparatus of PWM system can be controlled to a low level.

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patent: 4427978 (1984-01-01), Williams
patent: 4649383 (1987-03-01), Takeda et al.
patent: 4752774 (1988-06-01), Clerc et al.
patent: 4766430 (1988-08-01), Gillette et al.
patent: 4822142 (1989-04-01), Yasui
patent: 4935671 (1990-06-01), Harada et al.

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