Image compensation device, image compensation method, and a method for setting image compensation values

An image compensation method comprising:

• measuring an intensity of ambient light incident on a display panel, by a light sensor;
• reading a reflection ratio of the display panel from a first storage unit;
• converting a value obtained by multiplying the intensity of the ambient light by the reflection ratio to a value of the same form as a first gradation value to be applied to the display panel, and acquiring a second gradation value;
• subtracting the second gradation value from a third gradation value obtained through a first inverse transform corresponding to gamma correction already performed on the first gradation value, and acquiring a fourth gradation value;
• performing a second inverse transform corresponding to a display characteristic of the display panel on the fourth gradation value, and acquiring a fifth gradation value;
• setting a first look-up table in which the fifth gradation value is associated with the first gradation value, as a correction value which should be applied the display panel in place of the first gradation value;
• and
• compensating an image input to the display panel, by using the first look-up table.

A method for setting image compensation values, comprising:

• subtracting a second gradation value corresponding to a leakage spectrum value of a backlight illuminating a display panel from a third gradation value obtained through a first inverse transform corresponding to gamma correction already performed on a first gradation value to be applied to the display panel, and acquiring a fourth gradation value;
• performing a second inverse transform corresponding to a display characteristic of the display panel on the fourth gradation value, and acquiring a fifth gradation value;
• and
• setting a first look-up table in which the fifth gradation value is associated with the first gradation value, as a correction value which should be applied the display panel in place of the first gradation value.