SU425194A1 - DEVICE FOR INDICATING INFORMATION ON THE SCREEN OF ELECTRON-BEAM PIPE - Google Patents

Description

one

The invention relates to automation and computer technology and may be used in output and display devices for alphanumeric information.

Devices are known for indicative information on the screen of a cathode ray tube (CRT), containing a matrix of symbols associated with a decoder, electric keys connected to the outputs of the distributor and connected directly and through integrating circuits connected to the diverting systems to CRT.

A device “frequency – frequency” and a frequency divider are introduced into the proposed device, with the output of one of the electronic switches through a series “converter” - frequency and frequency divider of the connection to the input of the distributor.

This makes it possible to improve the accuracy of reproducing the contours of alphanumeric characters (to improve the quality of the image of characters).

RTA drawing shows the block diagram of the proposed device.

The device contains: resistor cells 1-4; distributor 5; electronic keys 6-9; Integrated Circuits Schemes 10 and 11; deflection systems 12 and 13; converter “Nahiriiie - frequency 14; frequency divider 15; CRT 16; input devices 17. The device operates as follows. When outputting, on the numeric, alphanumeric

symbol A on the screen of a CRT, on one group of resistor cells, the supply voltage is applied across bus 17. At the same time, the resolver 5 is established from the initial state to the first, opening all the first numbers of the group

electronic keys 6-9. In this case, the construction of the resistor dividers of other groups is connected to the input of the integrating circuits 10, 11, which, through the deflecting systems 12, 13, act on the electronic knockout of the CRT. The output voltage of circuits 10, 11 varies according to a linear law. If the velocity vector of the corresponding coordinate in this area is positive, then the corresponding reset divider is connected to the positive source, and vice versa. Therefore, the input of the circuits 10, 11 can be positive or negative; therefore, at the output of these circuits, the voltage rises or falls linearly.

Nano-motion of a displaced electron beam is achieved by simultaneously affecting it directly linearly applied to the coordinates X and Y, respectively. If the velocity vector is one of

the coordinate is zero, then the given number of the resistor divider is respectively absent, and no voltage is applied to the input of the corresponding integrator circuit. At the same time, the voltage level corresponding to the integration limits of the current vector is supplied via the first electronic key 8 of the group to the input of the voltage-to-frequency converter 14. The frequency of the video pulses of the converter is inversely proportional to the length of time. The pulses from the output of the Converter 14 is fed to the input of the divider 15 frequency. The division factor of circuit 15 is Q. When pulses Q arrive at the input, a signal appears at its output, switching the distributor to the next state. This opens all the second numbers of the electronic switches, connects the inputs of the circuits 10, 11, the second numbers of the resistor dividers, and the input of the converter 14 - the second resistor divider with the corresponding voltage, etc. If on the screen of the CRT a symbol not related to to its circuit, then from the output of one of the resistor cells, through a group of electronic switches 6, a signal is applied that modulates the electron beam of the CRT 16 in terms of brightness.

The deviation of the supply voltage of the resistor cells does not affect the reproduction accuracy of the calculated contours of alphanumeric characters, since an increase (decrease) in voltage leads to a proportional decrease (increase) in the integration time interval with these coordinate velocity vectors.

Subject invention

A device for displaying information on the screen of a cathode-ray tube containing resistor cells connected to the input buses and electronic keys connected to the distributor outputs, one electronic key directly, and the other two are connected via an sequentially connected integrating circuit and deflection systems , characterized in that, in order to improve the quality of the image of symbols, a voltage-frequency converter connected in series to the input one of the electronic switches, and a frequency divider connected to the input of the distributor.