Patent ID: 7952642

Claim:
A display system with a second display aspect ratio and for displaying a video signal with a first display aspect ratio, the display system comprising: a receiving unit for receiving the video signal; a detecting unit for detecting the first display aspect ratio of the video signal; at least one covering structure; and a comparing unit for comparing the first display aspect ratio with the second display aspect ratio according to the first display aspect ratio detected by the detecting unit, and determining whether the at least one covering structure is enabled in the display system so as to show the video signal corresponding to the display system, wherein the video signal is selected from one of the group consisting of a digital video broadcast (DVB) video format, a national television system committee (NTSC) video format, and a video-in video format, wherein when the first display aspect ratio of the video signal is determined to be a video-in video format, the detecting unit determines whether black sides will be generated at two sides of the screen of the display system according to the first display aspect ratio of the video signal, wherein the detecting unit compares brightness at two side regions of the screen with brightness at a middle region perpendicular to the two side regions to determine whether the black sides will be generated at the two sides of the screen of the display system, wherein the brightness at the two side regions is smaller than a first predetermined value, wherein the first predetermined value is equal to five times of a total number of pixels at the two side regions.