Display driving device and display device having the same

A display driving device comprising:

• a timing controller configured to generate image data including a plurality of pixel data, to generate a positive power saving signal based on magnitudes of positive polarity pixel data among the plurality of pixel data included in the image data and a positive reference magnitude, and to generate a negative power saving signal based on magnitudes of negative polarity pixel data among the plurality of pixel data included in the image data and a negative reference magnitude;
• a power management integrated circuit configured to generate a positive drive voltage having a voltage level that is varied based on the positive power saving signal, and to generate a negative drive voltage having a voltage level that is varied based on the negative power saving signal;
• and
• a column driver configured to receive the image data generated by the timing controller and the positive drive voltage and the negative drive voltage generated by the power management integrated circuit, to generate a plurality of positive output voltages corresponding to the positive polarity pixel data included in the image data based on the positive drive voltage, and to generate a plurality of negative output voltages corresponding to the negative polarity pixel data included in the image data based on the negative drive voltage.

A display device comprising:

• a display panel configured to display an image;
• and
• a display driving device configured to drive the display panel and coupled to the display panel via data lines and gate lines, the display driving device comprising:
• a column driver configured to generate output voltages corresponding to pixel data included in image data and to output the output voltages via the data lines, wherein the output voltages are varied according to a maximum magnitude of the pixel data included in the image data;
• and
• a gate driver configured to select and drive the gate lines.