in a gamma voltage generator and gamma voltage generating method that can tune the gamma voltages individually , several gamma currents of a same magnitude are generated for each to flow through a variable resistive element to generate a variable common voltage and several variable voltages , from which a common gamma voltage and several first gamma voltages are generated . by use of the symmetric property of the gamma curve corresponding to those gamma voltages to be generated , several voltages are generated by mapping the first gamma voltages with the common gamma voltage as the center axis , and from which several second gamma voltages are derived . the common gamma voltage and the first and second gamma voltages are provided for those gamma voltages corresponding to the gamma curve .