SU622073A1 - Device for dispaying information on crt screen - Google Patents

Description

one

The invention relates to the field of computing and can be used in the design of means of displaying information.

A device for displaying information on the screen of a color cathode ray tube is known, which contains control and sweep units, a symbol generator and color signal generators.

The closest technical solution to the invention is a device for displaying information on the screen of a color cathode ray tube containing registers connected to digital-to-analog converters, coordinate amplifiers connected to a coordinate deflection system, a character generator connected through a color amplifier to a color electronic modulator -beam tube, sign amplifiers connected to the sign-diverting system, voltage source connected to the anode of a color cathode ray tube.

A disadvantage of the known devices is the inability to use color cathode ray tubes with a barrier phosphor and the unequal scale of the image in different colors.

The aim of the invention is to improve the image definition.

The goal is achieved in that the device contains the first and second image scale switches and a controlled voltage source, the input of which is connected to one input of the first and second image scale switches, the output to a voltage source, other inputs of the first image scale switches are connected to the outputs digital-to-analog converters, outputs to the inputs of coordinate amplifiers, other inputs of the second switches are connected to other outputs of the character generator, outputs to the inputs of sign amplifiers teley.

The drawing shows a block diagram of a device for displaying information on the screen of a color cathode ray tube.

The device contains registers 1 and 2, connected to digital-to-analogue converters 3 and 4, the latter and the character generator 5 through image scale switches 6-9 are connected respectively to coordinate amplifiers 10 and 11 and sign amplifiers 12 and 13, to coordinate amplifiers 10 And I connected the co-ordinator deviating system 14, and to the sign amplifiers 12, 13 - the sign deviating system 15, the video amplifier 16 is connected to the sign generator 5 and the color

electron beam tube 17, voltage source 18 is connected to a color electron beam tube 17 and a controlled voltage source 19.

The device works as follows.

The inputs of registers 1 and 2 from the source of information, and, for example, from a computer, receive codes of the position of the mark on the screen with a color CRT barrier phosphor. The output signals of the registers are fed to the inputs of digital-to-analog converters 3 "4. The voltages corresponding to the coordinate codes X and Y from the digital-to-analog converters through the image scale switches 6 and 7 are fed to the coordinate amplifiers 10 and 11, which transform the input device to the corresponding currents, flowing through the coils of the coordinate deflection system 14.

After a certain time, sufficient to establish the electron beam at a point on the screen with coordinates determined by the codes recorded in registers 1 and 2, the sign code is transferred from the computer to the sign generator 5. At the outputs of the character generator, the voltage of the horizontal and vertical scanning of the sign and the signal of the highlighting of the sign begin to form. Signal illumination is amplified by video amplifier 16 and fed to color CRT 17. Signal voltage sweeps through the switches of scale 8 and 9 are fed to the inputs of sign amplifiers 12 and 13, the latter are transformed into currents and feed coils of the sign deflection system 15 with them.

After the reproduction of the first character from the computer is completed, the code of the coordinates of the next character arrives, after some time the code of the character, and the second character is displayed. In such a sequence, the display of all signs of the same color appears. In this case, the controlled high voltage source 19 is turned off and the voltage of the filament is only applied to the anode of the color CRT 17 from the high voltage source 18.

After all the signs of the same color are reproduced on the screen of a color CRT, a color signal is sent from the computer. A controlled high voltage source 19 is turned on via this link. In this case, the CRT 17 anode already receives a voltage equal to the sum of the voltages of the sources 18 and 19. The signal of the color sign also changes (increases) the transfer coefficient of the Scale switches 6-9. ScheduleOff {) enough time to turn on a controlled high voltage source 19, the inputs of registers 1, 2 receive codes 5 coordinates of a nerve sign of a different color, after outputting the beam to the corresponding point of the screen a sign generator of the first sign of a different color arrives . After reproduction in the second color of the nerve mark, sequential reproduction of all the other signs of the second color occurs. Thus, the introduction of an additional controlled high voltage source allows changing the color of the reproduced characters, and the mashtab switches are necessary to compensate for the change in the anode voltage. Thereby, the same sizes of characters and the dimensions of the floor of the image in different colors are maintained.

Claims (2)

1. USSR author's certificate number 485479, cl. G 06K 15/20, 1973. 2. Berman V. R. and others. Generators of magnetic sweep of electron-beam indicators. M., “Soviet Radio, 1976, p. 14, 15. I.-. / f