Display device and calibration method

A calibration method for a display device comprising a display panel, a backlight module and a circuit, wherein the display panel comprises a plurality of regions, the backlight module comprises a plurality of light emitting units, each of the regions corresponds to at least one of the light emitting units, and the calibration method comprises:

• driving a first light emitting unit of the light emitting units to produce a first brightness level by a current according to a parameter and a first duty cycle, and measuring the first brightness level of the first light emitting unit;
• determining if the first brightness level of the first light emitting unit is less than a predetermined brightness level, and if the first brightness level is less than the predetermined brightness level, adjusting the parameter such that the first brightness level of the first light emitting unit meets the predetermined brightness level, recording the adjusted parameter in a first calibration lookup table corresponding to the first light emitting unit, and defining a brightness-duty-cycle response curve based on the predetermined brightness level, the adjusted parameter and the first duty cycle;
• and
• determining whether the brightness-duty-cycle response curve of the first light emitting unit is linear or non-linear, and if the brightness-duty-cycle response curve is linear, obtaining an adjusted duty cycle according to a brightness level on the brightness-duty-cycle response curve, and if the brightness-duty-cycle response curve is non-linear, then interpolating an adjusted duty cycle according to a turning-point brightness level and a turning-point duty cycle of at least one turning point of the brightness-duty-cycle response curve.