Image processing device for adjusting characteristic data based on reference image and image display apparatus using the same

An image display apparatus that displays an image in response to an input image signal, the image display apparatus comprising:

• an image display unit that displays an image based on a preset image signal;
• and
• an image processing unit that processes the input image signal and outputs the preset image signal,
• the image processing unit comprising:
• a reference image signal generation module that generates an analog reference image signal, based on reference image data prepared in advance;
• a signal selector module that selects either one of an analog input image signal and the analog reference image signal;
• an A-D converter module that converts either of the analog input image signal and the analog reference image signal selected by the signal selector module into a digital image signal according to preset characteristic data;
• an image conversion processing module that generates the preset image signal, based on the digital image signal input from the A-D converter module;
• a storage module that stores data, which corresponds to the characteristic data set in the A-D converter module, in an updatable manner;
• and
• a characteristic data setting module that sets the data stored in the storage module as the characteristic data in the A-D converter module,
• at a predetermined timing, the characteristic data setting module actuating the reference image signal generation module to generate the analog reference image signal, controlling the signal selector module to select the analog reference image signal, adjusting the characteristic data set in the A-D converter module to make image data expressed by the digital image signal input from the A-D converter module into the image conversion processing module approach to the reference image data, and updating the data stored in the storage module.