Image adjustment device and image adjustment method

An image adjustment device suitable for a display, comprising:

• an image detector, configured to receive an input image comprising a plurality of segments, and determine whether each of the segments is first-type segment or a second-type segment according to brightness information of each of the segments, wherein the first-type segment has a higher risk of sticking than the second-type segment;
• a duty cycle setting device, coupled to the image detector and configured to set a duty cycle value of each of the segments in the first mode according to the type of the segments;
• an intensity calculator, coupled to the duty cycle setting device for calculating a pixel intensity of each of the segments according to the duty cycle value of each of the segments and a light diffusion coefficient set;
• and
• a compensator, coupled to the intensity calculator for generating a pixel gain value according to a pixel intensity value of each pixel of pixels of the segments, and adjusting pixel values of the pixels according to the pixel gain values.

An image adjustment device suitable for a display, configured to be in a first mode or a second mode according to whether the display is a light emitting diode display or a liquid crystal display, comprising:

• a register circuit, configured to set an operation mode of the image adjustment device to be one of the first mode and the second mode;
• and
• a local dimming module, configured to perform a local dimming process based on an input image comprising a plurality of segments, by calculating a duty cycle value of each of the segments according to pixel values of the segments to compensate the pixel values of each of the segments according to the duty cycle values of the segments and a light diffusion coefficient set,
• wherein in the first mode, the duty cycle value is a virtual duty cycle value, and the light diffusion coefficient set is a simulated light diffusion coefficient set, and
• in the second mode, the duty cycle value is a realistic duty cycle value for controlling a backlight device of the liquid crystal display, and the light diffusion coefficient set is a measured light diffusion coefficient set.