Selection system of Zeus displays

Although in a Zeus display a straightforward matrix addressing system can be constructed from just vertical electron-transport channels and horizontal row extraction electrodes, there are many unique advantages in adding extra selection plates. These are, e.g. cost reduction by a trade-off between electronics complexity and panel complexity, enhancement of internal contrast and, by choosing wider channels, reduction of transport voltage and improvement of triode performance. Several implications for the system design are discussed. Some subtle effects in the physics of selection switches are explained together with design rules for the selection plate geometry that avoid the associated image artefacts.