Method of and circuit for brightness and temperature-dependent control of an LCD illuminator
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United States of America Patent
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Sep 19, 1989
Grant Date -
N/A
app pub date -
Aug 6, 1987
filing date -
Aug 9, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to provide brightness-dependent control of a lamp which is used for illuminating a LCD display, it is known to switch the lamp on and off in dependence on the measured brightness of the incident ambient light. To prevent overheating of the liquid crystal display when it is, for example, exposed to direct sunlight, the operating voltage for the lamp is changed in dependence on the measured brightness of the incident ambient light. A further improvement is accomplished when, additionally, in dependence on the ambient temperature measured, the operating voltage for the lamp changes, more specifically the operating voltage is switched off when a presettable threshold value is exceeded. The circuit arrangement for performing the method requires very little design effort and cost and is integrable to a very large degree.
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