Gamma voltage generating apparatus and method of testing a gamma voltage

An apparatus for generating a gamma voltage capable of testing the gamma voltage, the apparatus comprising:

• a gamma voltage selection unit configured to select at least one of a plurality of source gamma voltages generated by a resistor string to output the at least one selected source gamma voltage;
• a gamma voltage output unit configured to provide a plurality of gamma voltages based on the source gamma voltages received from the resistor string and the at least one selected source gamma voltage received from the gamma voltage selection unit;
• and
• a gamma voltage test unit configured to select at least one of the gamma voltages received from the gamma voltage output unit based on a gamma test signal externally provided.

An apparatus for generating a gamma voltage capable of testing the gamma voltage, the apparatus comprising:

• a gamma voltage selection unit configured to select at least one of a plurality of source gamma voltages generated by a resistor string to output the at least one selected source gamma voltage;
• a gamma voltage output unit configured to provide a plurality of gamma voltages based on the source gamma voltages received from the resistor string and the at least one selected source gamma voltage received from the gamma voltage selection unit;
• and
• a gamma voltage test unit configured to output at least one gamma voltage that is set as a default value from the gamma voltages received from the gamma voltage output unit.

A method of testing a gamma voltage comprising:

• providing first and second register values for selecting the gamma voltage;
• dividing a voltage difference between a first supply voltage and a second supply voltage to output a plurality of source gamma voltages based on the first register value;
• selecting at least one of the source gamma voltages based on the second register value to output the at least one selected source gamma voltage;
• outputting a plurality of gamma voltages based on the source gamma voltages that are in turn outputted based on the first and second register values;
• and
• selecting at least one of the gamma voltages based on a gamma test signal externally provided.