Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2006-05-23
2006-05-23
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S118000, C341S120000, C341S136000, C341S143000
Reexamination Certificate
active
07049991
ABSTRACT:
A semiconductor device having a voltage-current conversion function, a digital-analog conversion function, and a gamma correction function is provided. A digital input signal (voltage) is input from an input terminal of a switching circuit. The switching circuit selects a current source to be connected to the input terminal according to the value of the digital input signal. Each current source outputs a predetermined value of current according to the signal from the input terminal. In this manner, by switching a current source for outputting current according to a digital input signal, gamma correction can be performed as well as digital-analog conversion.
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Barnie Rexford
Nguyen Khai M.
Semiconductor Energy Laboratory Co,. Ltd.
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