Digital-to-analog conversion circuit, data driver, and display device

A data driver, generating, as an output voltage, a voltage having a voltage value corresponding to a brightness level represented in a video data signal, and applying the output voltage to a display panel, wherein the data driver comprises:

• a reference voltage generation part, generating a reference voltage group having voltage values different from each other;
• a decoder, receiving the video data signal, selecting a plurality of reference voltages with overlapping corresponding to the brightness level represented in the video data signal from the reference voltage group, and outputting the reference voltages;
• an amplification circuit, having first to xth input terminals, x being an integer of 2 or more, and generating, as the output voltage, a voltage amplified by averaging the reference voltages respectively received by the first to xth input terminals with predetermined weighting ratios;
• and
• a selector, receiving a control signal specifying a first selection state or a second selection state, and switching voltages supplied to (x-m) input terminals excluding m input terminals, m being an integer of 1 or more and less than x, among the first to xth input terminals of the amplification circuit in correspondence with the first selection state or the second selection state,
• wherein in a case where the control signal indicates the first selection state, the selector supplies the output voltage to the (x-m) input terminals among the first to xth input terminals of the amplification circuit, and in a case where the control signal indicates the second selection state, the selector supplies the reference voltages to the (x-m) input terminals.

A display device, comprising:

• a display panel;
• and
• a data driver, generating, as an output voltage, a voltage having a voltage value corresponding to a brightness level represented in a video data signal and applying the output voltage to the display panel,
• wherein the data driver comprises:
• a reference voltage generation part, generating a reference voltage group having voltage values different from each other;
• a decoder, receiving the video data signal, selecting a plurality of reference voltages with overlapping corresponding to the brightness level represented in the video data signal from the reference voltage group, and outputting the reference voltages;
• an amplification circuit, having first to xth input terminals, x being an integer of 2 or more, and generating, as the output voltage, a voltage amplified by averaging the reference voltages respectively received by the first to xth input terminals with predetermined weighting ratios;
• and
• a selector, receiving a control signal specifying a first selection state or a second selection state, and switching voltages supplied to (x-m) input terminals excluding m input terminals, m being an integer of 1 or more and less than x, among the first to xth input terminals of the amplification circuit in correspondence with the first selection state or the second selection state,
• wherein in a case where the control signal indicates the first selection state, the selector supplies the output voltage to the (x-m) input terminals among the first to xth input terminals of the amplification circuit, and in a case where the control signal indicates the second selection state, the selector supplies the reference voltages to the (x-m) input terminals.