1. Field of Invention
Apparatuses and methods consistent with the present invention relate to adjusting position and size of an image signal using a clamp signal.
2. Description of the Related Art
In general, an image signal includes an active signal to be actually displayed on a screen of a display apparatus and a synchronization signal defining a starting point and an end point of the active signal. The image signal is provided to a signal processing unit of the display apparatus, and the signal processing unit processes the provided image signal so that an image can be displayed on the screen. At this time, an adjustment signal to adjust position and size of the active signal displayed on the screen requires, for example, a reference signal such as a clamp signal formed in a blanking interval between the synchronization signal and the active signal. Resolution and size of the screen on which the active signal is displayed may be adjusted based on the adjustment signal.
In the related art, even if an image signal with high resolution, such as a digital video interactive (DVI) signal having a pixel clock of more than 150 MHz, is input in the display apparatus, the display apparatus can not support such a high frequency. To overcome this problem, the display apparatus has to process an image signal having a reduced blanking timing.
However, when the reduced blanking timing image signal is input to the display apparatus, since the display apparatus processes the input image signal according to a signal processing standard with an existing blanking timing, there arises a problem in that the clamp signal is included in an interval of the active signal, thereby darkening and trembling an image.