 Since the late 2000s, CRTs have been largely superseded by newer "flat panel" display technologies such as LCD, plasma display, and OLED displays, which have lower manufacturing costs and power consumption, as well as significantly less weight and bulk.Flat-panel displays can also be made in very large sizes; whereas was about the largest size of a CRT television, flat panels are available in and even larger sizes.Cathode rays were discovered by Julius Plücker and Johann Wilhelm Hittorf.