Displaying device capable of displaying additional signal on blanking area of screen and displaying method thereof

Abstract

Disclosed is an image displaying device having a function of aspect ratio converting. The device has a CRT to display a video signal, an OSD/OSG generation unit to generate an additional signal, and a controller to control a display unit in order to display the additional signal in blanking areas which do not display the video signal. Moreover, the device has a luminance detection unit to detect a luminance level of the video signal displayed on the display unit, and the controller controls a signal generation unit to generate the additional signal corresponding to the luminance level detected from the luminance detection unit. Therefore, as the aspect ratio is changed, the additional signal is output to the blanking area when there is no blanking area in the CRT. Accordingly, the CRT is not different for the displaying area and the blanking area as the color of the screen is not changed.

Dependencies are inferred from the claim text.