Digital-analog converter, data driving circuit, and display device

A data driving circuit comprising:

• a digital-analog converter configured to convert an image data signal to an analog signal;
• and
• a demultiplexer configured to receive the analog signal and output a data signal, wherein the digital-analog converter includes:
• a gamma reference voltage generator configured to output gamma reference voltages in response to a first-group signal of the image data signal;
• a voltage selector configured to output, as a gamma selection voltage, one of the gamma reference voltages in response to a second-group signal of the image data signal;
• a first amplifier configured to receive the gamma selection voltage and output a first conversion voltage;
• a boosting circuit configured to convert the first conversion voltage to a second conversion voltage, in response to the first-group signal of the image data signal;
• and
• a second amplifier configured to receive the second conversion voltage and output the analog signal,
• wherein the boosting circuit includes:
• a first capacitor connected between a first node and configured to receive the first conversion voltage and a second node;
• and
• a boosting switching circuit configured to transmit one of a plurality of boosting voltages to the second node in response to the first-group signal of the image data signal.

An electronic device comprising:

• a display panel;
• a scan driving circuit configured to provide a scan signal to the display panel;
• a data driving circuit configured to provide a data signal to the display panel;
• and
• a driving controller configured to provide an image data signal to the data driving circuit, wherein the data driving circuit includes:
• a digital-analog converter configured to convert the image data signal to an analog signal;
• and
• a demultiplexer configured to receive the analog signal and output a data signal, and wherein the digital-analog converter includes:
• a gamma reference voltage generator configured to output gamma reference voltages in response to a first-group signal of the image data signal;
• a voltage selector configured to output, as a gamma selection voltage, one of the gamma reference voltages, in response to a second-group signal of the image data signal;
• a first amplifier configured to receive the gamma selection voltage and output a first conversion voltage;
• a boosting circuit configured to convert the first conversion voltage to a second conversion voltage, in response to the first-group signal of the image data signal;
• and
• a second amplifier configured to receive the second conversion voltage and output the analog signal,
• wherein the boosting circuit includes:
• a first capacitor connected between a first node and a second node, the first capacitor configured to receive the first conversion voltage;
• and
• a boosting switching circuit configured to transmit one of a plurality of boosting voltages to the second node, in response to the first-group signal of the image data signal.

A data driving circuit of a display device, comprising:

• a first voltage generator configured to output a first set of gamma reference voltages based on a first value of a first predetermined number of bits of an image data signal;
• a second voltage generator configured to generate a second set of gamma reference voltages based on a second value of the first predetermined number of bits of the image data signal;
• a voltage selector configured to select one of the gamma reference voltages in the first set of gamma reference voltages or the second set of gamma reference voltages based on a value of a second predetermined number of bits of the image data signal;
• and
• a boosting circuit configured to generate a conversion voltage based on the selected one of the gamma reference voltages, the conversion voltage corresponding to an analog voltage to be output from the data driving circuit to a pixel of the display device,
• wherein the boosting circuit includes:
• a first capacitor connected between a first node and a second node, the first capacitor configured to receive the selected one of the gamma reference voltages;
• and
• a boosting switching circuit configured to transmit one of a plurality of boosting voltages to the second node, in response to a first-group signal of the image data signal.