Patent ID: 8749540

Claim:
An apparatus for outputting a gamma filter reference voltage that has a plurality of pixel circuits, the apparatus comprising: a gamma filter reference voltage generator configured to generate a first reference voltage and a plurality of second reference voltages and to apply the first reference voltage to a gamma filter; a temperature sensor configured to generate temperature information based on a measured temperature; and a reference voltage adjustment unit configured to select at least one of the plurality of second reference voltages based on the temperature information, and to apply the selected second reference voltage to the gamma filter, wherein a difference between an anode driving voltage and a cathode driving voltage applied to the plurality of pixel circuits is configured to be adjusted according to the temperature information in a first range of temperatures of a range of driving temperatures, and wherein the reference voltage adjustment unit is configured to select the at least one of the plurality of second reference voltages according to the temperature information in a second range of temperatures, wherein the second range of temperatures is a remaining part of the range of driving temperatures.