a field emission display panel 20 , 80 , and 90 is used as a projection system . display panel 90 can be used as a stand - alone projector . alternatively , display panel 20 can be placed on a base 10 of a standard overhead projection system 60 and the image can be projected by a lens 50 onto a surface separated from display 20 . in yet another embodiment , a lens system 70 can be attached to display panel 80 to project the image on a surface separated from display 80 . display panels 20 , 80 , and 90 operate at a increased luminance to facilitate projection of the images displayed on the panels . the use of fed display panels 20 , 80 , and 90 facilitates a projection system which has low power consumption , is portable , and interfaces to a computer .