Display and method of adjusting tone of display

A display, comprising:

• a display panel, suitable for displaying according to an image signal;
• and
• a control unit, electrically coupled to the display panel and configured to:
• set a gamma value range according to an input signal;
• adjust a plurality of gamma values of a plurality of grayscales within a grayscale range respectively so that the gamma values of the grayscales gradually change within the gamma value range and are different from one another;
• and
• adjust the image signal according to the adjusted gamma values of the grayscales and output the adjusted image signal to the display panel, wherein the adjusted gamma values of the grayscales increase or decrease as a grayscale level of each of the grayscales rises, the adjusted gamma value of each of the grayscales satisfies a relational expression as follows:
• g=(g2−g1)·(nL)g3+g1, where g is the adjusted gamma value of each of the grayscales, g1 is one of a minimum gamma value and a maximum gamma value of the gamma value range, g2 is other one of the minimum gamma value and the maximum gamma value of the gamma value range, nL is a normalized grayscale of each of the grayscales and is within a range of 0 to 1, and g3 is within a range of 0.5 to 3.