Patent ID: 7136038

Claim:
A gamma voltage generating apparatus operated in various modes such that a brightness value is changeable in correspondence with an external environment, said apparatus comprising: a red gamma voltage generator, having at least one variable resistor and a plurality of parallel resistors connected, in parallel, between the variable resistor and a ground voltage source, for generating a plurality of red gamma voltages and controlling the plurality of red gamma voltages such that said brightness value is changeable in correspondence with each of said various modes; a green gamma voltage generator, at least one variable resistor and a plurality of parallel resistors connected, in parallel, between the variable resistor and a ground voltage source, for generating a plurality of green gamma voltages and controlling the plurality of green gamma voltages such that said brightness value is changeable in correspondence with each of said various modes; and a blue gamma voltage generator, having at least one variable resistor and a plurality of parallel resistors connected, in parallel, between the variable resistor and a ground voltage source, for generating a plurality of blue gamma voltages and controlling the plurality of blue gamma voltages such that said brightness value is changeable in correspondence with each of said various modes.