US 10,762,825 B2 · Gamma correction circuit and gamma correction method

Abstract

Disclosed is a gamma correction circuit and method capable of minimizing power consumption by adding third and fourth input amplifiers receiving reference voltages which are identical to voltages to first and second input amplifiers, respectively, and deactivating the first and second input amplifiers during an always on display (AOD) mode. The gamma correction circuit includes a first input amplifier configured to output a maximum voltage when active, a second input amplifier configured to output a minimum voltage when active, a third input amplifier configured to output a highest gamma voltage in response to the first reference voltage, and a fourth input amplifier configured to output a lowest gamma voltage in response to the second reference voltage. The first and second input amplifiers are deactivated when the display driving device operates in the AOD mode.

Claims20

Dependent claims

A gamma correction circuit, comprising:

a first input amplifier configured to output a maximum voltage when receiving a first reference voltage;
a second input amplifier configured to output a minimum voltage when receiving a second reference voltage;
a third input amplifier configured to output a highest gamma voltage when receiving the first reference voltage, wherein the first and third input amplifiers share a first input terminal;
and
a fourth input amplifier configured to output a lowest gamma voltage when receiving the second reference voltage, wherein the second and fourth input amplifiers share a second input terminal, wherein
the first input amplifier and the second input amplifier are deactivated when the display driving device operates in an always on display (AOD) mode.

3 more elements

A gamma correction circuit, comprising:

a first input amplifier and a third input amplifier configured to receive a first reference voltage;
a second input amplifier and a fourth input amplifier configured to receive a second reference voltage;
a first resistor column configured to receive and distribute voltages from the first input amplifier and the second input amplifier;
a decoder configured to output one or more of the voltages distributed by the first resistor column;
a plurality of output amplifiers configured to receive the one or more voltages from the decoder, and output voltages that exceed or are higher than a voltage from the fourth input amplifier and less than a voltage from the third input amplifier;
and
a second resistor column configured to generate grayscale voltages based on or in response to the voltages from the plurality of output amplifiers, wherein
output terminals of the third input amplifier and the fourth input amplifier are not electrically connected to the first resistor column or the second resistor column, and the first input amplifier, the second input amplifier, and the plurality of output amplifiers are deactivated when the display driving device operates in an always on display (AOD) mode.

5 more elements

Dependencies are inferred from the claim text.

Gamma correction circuit and gamma correction method

Life of this patent

Gamma correction circuit and gamma correction method

Life of this patent

Abstract

Claims20