Display brightness control circuit

Details Display brightness control circuit Display brightness control circuit

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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