Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-09-08
1996-05-14
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 79, 345209, G09G 330
Patent
active
055172075
ABSTRACT:
A method and a system for driving an electro-luminescence display panel of a matrix type has a compensation pulse applied to all the cells prior to or in the front of a pedestal pulse on every frame cycle. The level of the compensation pulse is higher than the pedestal pulse but low enough not to light the cells by itself. The duration of the compensation pulse is long enough to saturate charge polarization in the EL material of the cell, as a dielectric, at the applied voltage. Therefore, brightness of the lighted cell is kept constant regardless of the number of lighted cells on the same data electrode. Each of two power-receiving terminals of push-pull scan drivers is connected to a pulse generator respectively. One of the two power-receiving terminals may be floated from the pulse generator while data pulse is applied to the data electrodes. This configuration prevents damage of the CMOS drivers by latch-up caused therein, as well as reducing power consumption produced by charging current of the data pulses into non-lighted cells.
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Kawada T. et al., "A Symmetric Drive with Low Voltage Drivers for ac TFEL", Fujitsu Laboratories Ltd., Atsugi, Kanagawa, Japan Display, 1986, pp. 772-275.
Aoki Tetsuo
Kawada Toyoshi
Kobayashi Tetsuya
Miyata Hiroyuki
Yamaguchi Hisashi
Fujitsu Limited
Hjerpe Richard
Saras Steven J.
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