Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-11-01
1998-04-07
Saras, Steven
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345183, 178 18, 3151693, G09G 328
Patent
active
057369739
ABSTRACT:
A backlighting system is placed in an elongated interior space within a personal digital assistant (PDA) which normally houses a stylus used to touch a liquid crystal display (LCD) touch and display screen. A backlight driver circuit is constructed on a printed circuit board (PCB) which fits within the elongated space, and an on-off switch extends from the PCB to an exterior hole formed in the PDA housing. An on-time control turns off power to the backlight driver circuit after a predetermined time has elapsed following activation of the on-off switch, and a dimming control controls the amount of energy delivered to the electroluminescent film. A torroidal switching transformer of a high voltage power supply minimizes noise, and a switching controller switches adjustable width current pulses through the transformer to regulate the high voltage level. A flyback circuit captures and uses a portion of the back EMF energy created when the current pulses are switched through the switching transformer. A H bridge of transistors alternately connects the high voltage positively and negatively to energize the electroluminescent film.
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Godfrey Tim
Hughes, Jr. David C.
Digital Ocean, Inc.
Ley John R.
Saras Steven
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