Digital-to-analog converter, data driver, and display device

A digital-to-analog converter, configured to output an output voltage having one of 2(K+1) voltage levels obtained by dividing a first voltage and a second voltage into 2(K+1) according to (K+1) bits of digital data (K is a positive number of 1 or more), the digital-to-analog converter comprising:

• a differential amplifier comprising a plurality of input terminals and configured to output a calculation result based on voltages respectively received at the plurality of input terminals from an output terminal of the differential amplifier as the output voltage;
• and
• a first decoder configured to receive the first voltage and the second voltage and assign and supply the first voltage or the second voltage to each of the plurality of input terminals of the differential amplifier based on the (K+1) bits of digital data,
• wherein the differential amplifier comprises:
• 2K differential pairs each comprising an inverting input terminal to which the output voltage is commonly input, a non-inverting input terminal to which one of the voltages received at the plurality of input terminals is supplied as an input voltage, and an output pair, wherein the output pairs are commonly connected, each of which is driven by a tail current received individually;
• an amplification stage configured to generate the output voltage by an amplification effect based on output of one or both of the output pair of each of the 2K differential pairs;
• and
• a tail current control circuit configured to individually supply first to 2Kth tail currents to the 2K differential pairs and control, for each differential pair, first to 2Kth current ratios of the first to 2Kth tail currents to a reference current value based on the digital data,
• wherein the tail current control circuit is configured to set each of the first to 2Kth current ratios to a maximum value, a minimum value, or an intermediate value among three predetermined values and perform correction to increase one of the maximum value and the minimum value and decrease the other for the current ratio of the tail currents supplied to at least two predetermined differential pairs of the 2K differential pairs.