摘要 |
A matrix display device comprises cavities ( 20 ) having walls at least one of which is covered with a material ( 24 ) having a secondary emission coefficient of more than unity. The cavities form a planar arrangement substantially parallel to the display screen which has a phosphor display screen. The cavities are provided with electrodes ( 21, 215, 217, 5 22, 225, 228 ) and the display device has a circuit for supplying an oscillating AC voltage (Vr, VRF) to said electrodes ( 21, 215, 217, 22, 225, 228 ) for generating electrons within the cavities by secondary emission. The cavities ( 20 ) have apertures ( 25 ) facing the screen ( 41 ), and the display device has a circuit for selectively letting electrons generated within the cavities pass said apertures and accelerating electrons having passed said apertures to the phosphor display screen.
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