GB1110403A - Improvements in or relating to electric discharge tubes - Google Patents

Abstract

1,110,403. Electric selective signalling. RANK ORGANISATION Ltd. 16 July, 1964 [7 May, 1964], No. 19111/64. Heading G4H. [Also in Division H1] The outputs 20 (Fig. 4), (120, Fig. 5, not shown) from a character generator set up the pattern held by the resistances on grids g 1 to g 14 of an electric discharge tube, the pattern on the screen being formed by a plurality of electron beams arranged in a column (Fig. 2a, not shown) or two columns (Fig. 2b). The character generator comprises matrices 12, each character being formed by appropriate positioning of resistances (Fig. 4) or by diode gating and resistances (Fig. 5, not shown). The input leads 14 to the matrices are pulsed sequentially, there being ten input leads with the single column arrangement of beams and twelve leads with the double column arrangement. The horizontal position of the character on the screen is controlled by a register comprising bi-stable stages (400, Fig. 9, not shown), the end of the sequential pulse generator signal scanning each of the vertical conductors of the matrics 12 counting the register on one stage, so that the appropriate deflection voltage is applied to the X plates of the tube.