| 摘要 |
<p>A memory system includes an array of memory elements, each of which is set to one of three or more memory states independently from the other elements by means of storage of one of a corresponding number of associated setting voltages. Readout of the memory-state information thus preset is accomplished by applying to the entire array a signal having a special periodic pulsed waveform with each memory state being associated exclusively with a different portion of the waveform, and each memory element responds only to that portion of the waveform associated with its particular preset state. The memory elements, each of which includes s capacitor in series with a bidirectional switch having both a high and a low impedance and characterized by a "breakback" response, "remember" their respective states throughout, until again reset to another state. A light valve or light source may be associated with and controlled by each memory element, thus affording an image display. Each memory state may be associated with an intensity or brightness level by modifying the waveform so that a different duty factor is associated with each memory state. A complete television image display incorporating a matrixed array panel of memory-display elements is described in which gray scale with storage is achieved by controlling the memory states, and thus the duty factors, of the respective elements of each row of the panel in accordance with respective samples of a line of video signal quantized to one of a fixed number of discrete intensity levels each of which is associated with a memory state.</p> |
