Filter glasses for use by an observer of a stereoscopic digital display system that displays stereoscopic images including first-eye images and second-eye images on a display surface , comprising: a first-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the first-eye images and block light from the second-eye images; a second-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the second-eye images and block light from the first-eye images; a frame having arms and rims , the rims having a rear portion facing the eyes of the observer , when the filter glasses are positioned on the head of the observer , the arms extending from the rims towards the ears of the observer , when the filter glasses are positioned on the head of the observer , the first-eye filter and the second-eye filter being mounted to the rims of the frame , the frame being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer . a first-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the first-eye images and block light from the second-eye images; a second-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the second-eye images and block light from the first-eye images; a frame having arms and rims , the rims having a rear portion facing the eyes of the observer , when the filter glasses are positioned on the head of the observer , the arms extending from the rims towards the ears of the observer , when the filter glasses are positioned on the head of the observer , the first-eye filter and the second-eye filter being mounted to the rims of the frame , the frame being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer . the rims having a rear portion facing the eyes of the observer , when the filter glasses are positioned on the head of the observer , the arms extending from the rims towards the ears of the observer , when the filter glasses are positioned on the head of the observer , the first-eye filter and the second-eye filter being mounted to the rims of the frame , the frame being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer . <EOS>