Method and device for the polarizing of an LCD screen as a function of the ambient luminosity
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United States of America Patent
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Nov 18, 2003
Grant Date -
N/A
app pub date -
Jun 19, 1998
filing date -
Jun 20, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To obtain improved readability of a liquid crystal display screen under varied conditions of ambient luminosity, it is possible to increase the dynamic range of variation of the polarizing voltage. However, this leads to an increase in the electrical power consumption and to contrast reversal defects. To prevent this phenomenon, it is proposed not to modify the dynamic range of variation of polarizing voltage but to shift this range towards the lower voltages when the ambient luminosity increases or towards the higher voltages when the ambient luminosity diminishes. Thus, the white level is favored under high ambient luminosity and the black level is favored under low or normal luminosity.
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