Display device having a voltage generator with digital-analog converter for varying output power voltage

A display device, comprising:

• a display panel which displays an image varied in real time;
• and
• a control circuit board connected to the display panel,
• wherein the control circuit board includes:
• a controller which analyzes information of the image in real time and determines in real time a digital-type power voltage based on gray scale for the image;
• a voltage generator which generates an analog-type power voltage based on the digital-type power voltage received from the controller;
• and
• a voltage converter which generates an output power voltage based on the analog-type power voltage received from the voltage generator,
• wherein the voltage generator includes a digital-analog converter which converts a digital signal of the digital-type power voltage into the analog-type power voltage, and
• wherein the digital-analog converter includes:
• a voltage range setting part which sets a voltage range of the analog-type power voltage;
• and
• a conversion part which generates the analog-type power voltage to be within the voltage range in real time based on the digital signal of the digital-type power voltage.