Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control
Reexamination Certificate
2007-10-25
2011-11-15
Nguyen, Chanh (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Intensity or color driving control
C345S102000, C345S207000
Reexamination Certificate
active
08059141
ABSTRACT:
A display brightness control circuit of a liquid crystal display device includes a logarithmic-linear converting circuit for converting an illuminance signal having a logarithmic relationship with incident light into a linear signal. When an output of an external light sensor is a logarithmic signal, the logarithmic signal is converted into a linear signal through the logarithmic-linear converting circuit, and when an output of the external light sensor is a linear signal, the logarithmic-linear converting circuit is not involved. The logarithmic-linear converting circuit corresponds to an exponential circuit which is an inverse function of a logarithm log. Further, when even the same logarithmic output illuminance sensor is different in input-output characteristics, setting of the abovementioned exponential circuit can be changed.
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Akai Akihito
Awakura Hiroki
Kurokawa Yoshiki
Sakamaki Goro
Takada Naoki
Karimi Pegeman
Mattingly & Malur, PC
Nguyen Chanh
Renesas Electronics Corporation
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