Abstract: Automatic controllable display device according to image display direction comprising: image display matter which image displayed in; slope information controller for detecting slope information of the image display matter; main controller for generating image controlling signal as a slope of the image display matter and receiving the slope information of image display matter which is detected by the image information controller; image display controller which handle image signal for displaying in the image display matter by image controlling signal; image display memory for storing the image signal, and furnishing the image display matter the image signal.