Abstract The disclosure is of a circuit which can be used in an information-handling and display system and includes a cathode glow display tube containing an anode and ten cathode electrodes which are coupled to a source of information signals in the system through a driving circuit. The driving circuit is a logic circuit which receives information signals from a decoder circuit and applies them to the cathode electrodes of the display tube, and the tube displays a number represented by the information signals when energizing potential is also applied to the tube anode. The driving circuit includes a control circuit which disables both the logic circuit and the display tube at desired times. The logic circuit includes five pairs of transistors connected in two groups with an auxiliary control transistor operating each group. The control circuit includes a transistor connected to the two control transistors for turning them off when desired to blank the display tube. A system is also disclosed for using the principles of the invention for controlling the timing of the application of information signals to the cathode electrodes and switching potentials to the anode electrodes of a series of display tubes in an informationhandling instrument.
Inventors
👤 Arpad Somlyody
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 05:31
CPC Classifications
H; H03; H03K; H03K21/00; H03K21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
In a decoding system for driving at least one multiple cathode display device for displaying information thereon, including a plurality of glow transistors coupled to different cathodes, said glow transistors being arranged in at least two groups, and a plurality of auxiliary transistors, one auxiliary transistor coupled to each group for rendering said groups of transistors conductive or nonconductive when said auxiliary transistors are conductive or nonconductive, respectively, the improvement of a blanking circuit comprising: a blanking transistor, said blanking transistor being connected to like electrodes of said auxiliary transistors for enabling said auxiliary transistors to be conductive or nonconductive when said blanking transistor is conductive or nonconductive, respectively, and means operating independently of said information for selectively switching said blanking transistor between said conductive and nonconductive states, said switching means being adapted to render said auxiliary transistors nonconductive during the time when a change occurs in said information.
Claim 2
Dependent Claim
149 words
In a decoding system for driving at least one multiple cathode display device for displaying information thereon, including a plurality of glow transistors coupled to different cathodes, said glow transistors being arranged in at least two groups, and a plurality of auxiliary transistors, one auxiliary transistor coupled to each group for rendering said groups of transistors conductive or nonconductive when said auxiliary transistors are conductive or nonconductive, respectively, the improvement of a blanking circuit comprising: a blanking transistor, said blanking transistor being connected to like electrodes of said auxiliary transistors for enabling said auxiliary transistors to be conductive or nonconductive when said blanking transistor is conductive or nonconductive, respectively, and means operating independently of said information for selectively switching said blanking transistor between said conductive and nonconductive states, said switching means being adapted to render said auxiliary transistors nonconductive during the time when a change occurs in said information.