| 摘要 |
1,239,779. Gaseous discharge matrix displays. CONTROL DATA CORP. 18 Nov., 1968 [28 March, 1968], No. 64621/68. Heading G5C. Each gas cell 102 of the display 100 is capacitatively coupled to a pair of electrodes 104, 106; each cell 102 is capable of retaining a memory voltage after the drive voltage has been removed and the discharge has ceased; and there are means 112, 114 for supplying a unidirectional voltage and means 110 for supplying an oscillating voltage, the peak sum of both voltages being sufficient to fire a selected cell. As described, a particular X- drive line 106 is selected by (i) choosing one of the two write pulse generators 112, 114 (this in effect selects four of the lines 106) and (ii) clamping the three undesired lines 106 to ground by means of, e.g. clamps 118, 120, 122. A similar process is followed in circuitry 126 to select the desired Y-line 104. Once a cell has been ignited it will continue to operate on the oscillating sustain voltage 110, owing to the favourable bias provided by the retained memory voltage. To erase a cell, the memory voltage is destroyed by (i) ceasing to apply sustain pulses, (ii) applying a slowly increasing write pulse; this causes the cell to fire prematurely and hence to lose its memory voltage. The modulation of light intensity is achieved by controlling the frequency of the oscillating sustain voltage 110. Transistor circuits for supplying the various drive voltages are described (Figs. 6 to 8, not shown). |
