Method for maintaining optical quality of display and display thereof

A display, comprising:

• a backlight unit;
• a display unit;
• and
• a driving unit, coupling the backlight unit and the display unit and configured to perform the following operations:
• providing a preset gamma value of the display;
• driving the driving unit based on the preset gamma value of the display to obtain a first display luminance of the backlight unit according to the preset gamma value of the display;
• performing local dimming of the backlight unit in the display to obtain a second display luminance of each area in the measured backlight unit;
• receiving, by the driving unit, the second display luminance to compare the second display luminance with the first display luminance for obtaining a luminance difference;
• and
• providing the luminance difference into the second display luminance of the backlight unit for luminance compensation, so that the backlight unit has a third display luminance;
• wherein the step of driving the driving unit based on the preset gamma value of the display to obtain the first display luminance of the backlight unit according to the preset gamma value of the display comprises:
• calculating a base number based on a black screen grayscale measured value and a white screen grayscale measured value of the backlight unit, and raising the base number to the power of the preset gamma value, thereby obtaining the first display luminance of the backlight unit;
• wherein a formula for obtaining the first display luminance is expressed as (L0_m+(L255_m−L0_m)*(Ln_m/255))γ, where L0_m denotes the black screen grayscale measured value of the m-th sub-millimeter light-emitting diode, L255_m denotes the white screen grayscale measured value of the m-th sub-millimeter light-emitting diode, Ln_m denotes the grayscale value of the m-th sub-millimeter light-emitting diode corresponding to the preset gamma value, n denotes 0 to 255, and γ denotes the gamma value.