Gamma voltage generator and display device including the same

A display device comprising:

• a display panel comprising a plurality of pixels;
• a gamma voltage generator configured to output a plurality of gamma voltages;
• a data driver configured to generate a data signal based on the gamma voltages, and to provide the data signal to the pixels;
• a scan driver configured to provide a scan signal to the pixels;
• and
• a timing controller configured to control the gamma voltage generator, the data driver, and the scan driver,
• wherein the gamma voltage generator comprises:
• a reference gamma selecting circuit configured to receive a first reference voltage, and a second reference voltage that is higher than the first reference voltage, and to select an upper reference gamma voltage and a lower reference gamma voltage based on a dimming level, the upper reference gamma voltage corresponding to a maximum gamma tab voltage among voltages between the first reference voltage and the second reference voltage, and the lower reference gamma voltage corresponding to a minimum gamma tab voltage among the voltages between the first reference voltage and the second reference voltage;
• a bias control circuit configured to calculate the minimum gamma tab voltage based on the upper reference gamma voltage and the lower reference gamma voltage, and to output bias control signals when the minimum gamma tab voltage is less than a reference voltage;
• a gamma tab voltage generating circuit configured to generate a plurality of gamma tab voltages between the minimum gamma tab voltage and the maximum gamma tab voltage based on the upper reference gamma voltage and the lower reference gamma voltage;
• and
• a gamma output circuit configured to distribute the gamma tab voltages to output gamma voltages corresponding to a gamma curve.