Patent ID: 7362340

Claim:
A method for controlling a resolution of a graphic image comprising: (a) selecting a first resolution value of the graphic image to be displayed on an external display unit, said first resolution value corresponding to first horizontal and vertical resolution values; (b) additionally selecting a second resolution value corresponding to a valid screen size of the external display unit, said second resolution value being less than the first resolution value, and said second resolution value corresponding to second horizontal and vertical resolution values corresponding to a valid horizontal and vertical frequency so that the graphic image controlled by the first resolution value selected at the step (a) is displayed within the valid screen size; (c) confirming a source type on the graphic image to be displayed on the external display unit and a screen mode; (d) referring to at least one from the selected first and second resolution values and reconfiguring the graphic image according to a result of the confirmation; and (e) shifting a start point of the graphic image controlled by the second horizontal and vertical resolution values selected at the step (b) to within a valid display period contained between horizontal sync signals and excluding part of a rear end of the graphic image from a valid display period such that a number of pixels of the graphic image in a horizontal direction is reduced and a number of lines of the graphic image in a vertical direction is reduced, wherein if the source type of the confirmed graphic image is a source type other than a video or broadcast image or is a video or broadcast image based on a screen mode other than a full screen mode, the referring step (d) refers to the first and second resolution values, and if the source type of the confirmed graphic image is a video or broadcast image based on a full screen mode, the referring step (d) refers only to the first resolution value, and wherein the part of the rear end of the graphic image excluded from the valid display period corresponds to an amount the start point of th.e graphic image is shifted to within the valid display period.