| 摘要 |
<p>1415230 Matrix displays PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 21 Dec 1973 [8 Jan 1973] 59465/73 Headings G5C and G4H Gas discharge display apparatus comprises a display tube 1 with (1) a set of anodes 3, 5, 7 connected to output electrodes of a set of transistors 9, 11, 13, which have control electrodes connected to outputs 17, 19, 21 of a control circuit 23, and further electrodes connected to a supply terminal 25 at OV.; and (2) a set of cathodes 29, 31 ... 45 co-operating with anodes 3, 5, 7 and connected through capacitors 47, 51, 55 to output electrodes of a set of transistors 49, 53, 57, which have control electrodes connected to outputs 59, 61, 63 of a control circuit 65, further electrodes connected to terminal 25, and output electrodes connected via load impedances 86, 88, 90 to a supply terminal 83 at -50 v.; and via a switch (e.g. a transistor 85) which stops current flowing in the apparatus when the electrodes 3, 5, 7 are not energized. The load impedances preferably include transistors 87, 89, 91, connected as constant-current devices. The electrodes 29, 31 ... 45 are also connected via diodes 67, 69, 71 to a supply terminal 73 at - 130 v. Transistors 9, 11, 13, 49, 53, 57 of the MOS type form an integrated circuit 15 together with the control circuits 23, 65, which switch the transistors selectively to energize the electrodes so that a selection of the cathodes 29,31... 45 is energized, presenting an array of dots, segments &c. as required. In operation, if cathode 29 facing anode 31 is to light up, transistor 9 is made conductive and transistor 49 is cut off. The potential on anode 3 is high and is applied through resistor 75 to the base of transistor 85, which therefore conducts. Transistor 87 conducts, discharging capacitor 47 so that cathode 29 falls further in potential, cutting off diode 67. A discharge between anode 3 and cathode 29 occurs, and cathode 29 lights up, the discharge current remaining constant until it is extinguished by cutting off transistor 9 and turning on the transistor 49. Capacitor 47 is re-charged through diode 67. The anodes and cathodes could be interchanged in function, and the tube 1 could be divided into more than one discharge space or replaced by a plurality of tubes.</p> |
