Patent ID: 7843416
Filing Date: 2010-11-30
Classification: G02B,G02F,G09G,H01J,H04N

Abstract:
1. A method of controlling contrast of an image displayed by a display apparatus capable of displaying an image within a predetermined range of gray levels, the display apparatus including an illuminating light source and a computer control, the method comprising: processing brightness information of an input image signal and determining brightness and a range of gray levels for the input image signal; and if the image corresponding to the input image signal is a dim image of a low brightness and low contrast, adjusting the amount of light from the illuminating light source to control the contrast by changing the determined range of gray levels to a second range of gray levels greater than the determined range of gray levels, such that the contrast of the image is increased and decreasing the amount of light from the illuminating light source so as to alleviate any decrease of brightness of the image which is caused by performing the control of changing the range of gray levels to the second range of gray levels, such that the contrast of the image is increased.