美国科学家研制成一种新型的无荧屏电视机，这是电视技术的一大创新。现在使用的电视机，都必须将画面在荧屏上成像后才能看到，无荧屏的电视机似乎是不可想象的。美国华盛顿大学的研究人员试制了一种称为“虚像视网膜显示器”的装置，该装置利用激光扫描将图像直接成像在眼球 American scientists developed a new type of screenless TV, which is a major innovation in television technology. The television sets that are used now have to be able to see the picture on the screen before they can be seen. It seems inconceivable that the screenless TV sets are available. Researchers at Washington University in the United States tried out a device called a “virtual retinal display” that uses laser scanning to image an image directly at the eyeball