Patent ID: 6122002
Filing Date: 2000-09-19
Classification: H04N

Abstract:
A method for determining a black point of a display, the method comprising the steps of:controlling a display to display a standard brightness region with an inputted predetermined value which is different from a black point of the display, the standard brightness region exhibiting a predetermined brightness, the standard brightness region serving as a standard for determining a black point;controlling the display to display a comparison brightness region with a variably-inputted value, the comparison brightness region being located next to the standard brightness region;gradually changing the value inputted for the comparison brightness region so that the comparison brightness region exhibits a brightness change both in a direction from a first state distinguishable from the standard brightness region into a second state indistinguishable from the standard brightness region and in a reverse direction from the second state into the first state, wherein the value changing step includes the steps of:gradually increasing the value inputted for the comparison brightness region from a value lower than the black point;determining, as a first black point, the value inputted when the comparison brightness region first becomes distinguishable from the standard brightness region while the value inputted for the comparison brightness region is being gradually increased;gradually decreasing the value inputted for the comparison brightness region from a value higher than the black point; anddetermining, as a second black point, the value inputted when the comparison brightness region first becomes indistinguishable from the standard brightness region while the value inputted for the comparison brightness region is being gradually decreased; anddetermining the black point of the display based on both the first and second black points.