| 摘要 |
A display device has a display screen ( 130 ) comprising a first array of picture elements ( 135 ) for displaying image information, and cathode means ( 120 ) for emitting electrons. The picture elements ( 135 ) are grouped together in sub-arrays ( 132 ). The emitted electrons are collected by an electron concentrator ( 115 ) which redistributes the electrons into a homogenous electron beam (EB). A single electron concentrator ( 115 ) is present for each sub-array ( 132 ) of picture elements ( 135 ), and the display device has selection means ( 140 ) for deflecting the electron beam (EB) leaving an electron concentrator ( 115 ) to any picture element ( 135 ) of the corresponding sub-array ( 132 ). Thereby, the displayed image may have a relatively high resolution. In a preferred embodiment, the image brightness is particularly high and variations in brightness uniformity over the displayed image are reduced.
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