GB1349675A - Display devices - Google Patents

Abstract

1349675 Cathode-ray tube displays MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 19 April 1971 [16 Feb 1970 27 Feb 1970] 21860/71 Heading H4T In an arrangement in which characters, picture elements, &c. are displayed on the screen of a cathode-ray tube by intensity modulation of a horizontal line raster a plurality of lines of character, &c. codes is fed (from, e.g. a computer) via an input-output device 20 (Fig. 1) to a refresh memory 21 circulating at clock frequency C1 a single line of codes being supplied, during the time of scanning the space between successive rows of characters (switch 24 in the opposite position to that shown), to a shift register 22 which is then (switch 24 as shown) caused to circulate at clock frequency . C2 (where C2 is the horizontal scanning rate) and supply an output via a serial-to-parallel converter 25 and pattern generator 26 to control the display. Characters are produced in dot matrix form as shown in Fig. 4 and picture elements in the form shown in Fig. 5 in which each of the areas a ... f may comprise a sub-pattern, under the control of the respective codes shown in Fig. 6 the discrimination bits of which automatically change the operation of the display system (Fig. 7, not shown). Mathematical function curves may also be displayed (Fig. 12, not shown), the display may be produced on a standard television receiver.