| 摘要 |
<p>A picture display device has a vacuum envelope and is provided with a face plate whose inner side supports a luminescent screen, a rear wall situated at a short distance therefrom, and the space inbetween accommodating a plurality of electron sources which cooperate with a plurality of electron transport ducts with walls which comprise a dielectric material for transporting, through vacuum, produced electrons towards positions at a small distance from the luminescent screen. Means for reducing the effects of undesired charge transfer of the duct walls are provided to improve the start-up and/or steady state electron transport conditions. In a practical embodiment the outer sides of the duct rear walls are provided with a (start-up) conductor means to which an initiation potential is applied, which is equal to or higher than the potential applied for producing the electron transport field.</p> |
