Level shift circuit and display driver

A display driver for driving a display panel, comprising:

• a level shift circuit configured to receive a pixel data signal that represents a brightness level of a pixel in an image, a reference voltage, a first voltage, a second voltage and a third voltage, and to generate to a level-shifted pixel data signal by increasing an amplitude of the pixel data signal, the reference voltage and the first to third voltages satisfying one of
• a first condition in which the reference voltage<the first voltage<the second voltage<the third voltage, and
• a second condition in which the reference voltage>the first voltage>the second voltage>the third voltage;
• a digital analog converter configured to convert the level-shifted pixel data signal to a voltage value;
• and
• an output buffer configured to apply a pixel driving voltage having the voltage value to a data line of the display panel, wherein
• the level shift circuit comprises:
• a first level shift circuit configured to
• receive the pixel data signal having a first amplitude that is within a difference between the reference voltage and the first voltage, and
• level shift the pixel data signal to a signal having a second amplitude that is within a difference between the reference voltage and the second voltage;
• and
• a second level shift circuit configured to
• level shift the signal with the second amplitude received from the first level shift circuit, to a signal having a third amplitude that is within a difference between the reference voltage and the third voltage, and
• output the signal with the third amplitude as the level-shifted pixel data signal.