Illumination of displays with control which switches illuminator in response to changes in the display
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United States of America Patent
Stats
-
Nov 8, 1994
Grant Date -
N/A
app pub date -
Nov 27, 1992
filing date -
Nov 28, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A problem arises in electronic equipment incorporating a display, such as an LCD display, which is not intrinsically illuminated. The present invention provides a controlled backlight for such displays, and is particularly useful in battery-powered equipment where power consumption must be kept to a minimum. The circuitry comprises a display 1 controlled via a conventional display driver 6 from other equipment (not shown) such as a microprocessor. Whenever the display is changed a signal is sent also to a timer circuit 7 which triggers, and passes a control signal to an electronic switch 4 which in turn passes power from a battery 3 to a lamp 2. The lamp 2 is arranged to illuminate the display 1. After a preset period, the timer circuit 7 sends a further control signal to the switch 4 to switch lamp 2 off.
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Cited Art Landscape
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