My first "Big Screen" TV was exactly that. A very large lens that weighed about 13 pounds and was about 8 inches in diameter. It just sat in a BOX about 15 inches away from the 13 inch TV screen. When i turned the tv brightness all the way up... and turned ALL the lights in the room OFF... i had a GIANT picture (about 4 feet across) on a special curved screen. I thought it was so cool. You can make one in 2 minutes. Just hold a large magnifier lens in front of any bright monitor screen. It will project the image a few feet away in a DARK room The image will be UPSIDE DOWN. This can be corrected by turning the monitor upside down, or by reversing the wiring in the picture tubes "deflection yoke".