SU824288A1 - Device for displaying information on crt screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION ON SCREEN OF ELECTRON BREAD TUBE

I

The invention relates to automation and computing and can be used in the construction of devices for displaying alphanumeric information on the screens of electron-beam tubes (ELT).

There is an alphanumeric display, on the screen of which information can be displayed in tabular form, but only if there are certain programs in its control device. Splitting the columns of the table is achieved by skipping individual familiarity in each row. The only thing left to do with this device is to reduce the information capacity of the frame when displaying tables;

It is also known a device for displaying information that allows changing the intervals between the characters reproduced by the method of a small-format television network L2J. However, this device does not perform the specified function with other methods of reproducing symbols.

The closest in technical essence to the present invention is a device for forming symbols on a CRT screen, containing control and synchronization blocks, frame and line scanning blocks, a symbol generator, and a modulation block are bright. ti, segment shaper, compensation unit, and a CRT with a diverting system p.

A disadvantage of this device is the inability to tabulate

5 Columns of the table without reducing the information capacity of the frame and displaying several tables on the screen with different numbers of columns and characters in the columns.

The purpose of the invention is to show the accuracy of the display and expand the field of application of the device by providing the ability to tabulate alphanumeric information without reducing the information capacity of the frame.

The goal is achieved by the serially connected pulse distributor, the block of OR elements and the switch, the first distributor input connected to the synchronization unit, the second input to the symbol generator, the other input of the switch connected to the vertical scanning unit, and the output to the horizontal scanning unit. The drawing shows a block diagram of the proposed device.

The device contains a synchronization block J block 2 line scan, block 3 frame scan, 4 character generator, trigger 5, modulation block 6, pulse distributor 7, block 8 OR elements, switch 9, CRT 10, coordinate AND and sign 12 deflection lines . The unit 2 includes a 13-pulse counter, a digital-to-analog converter 14, and an amplifier 15 of the current scanning horizontal beam of a CRT.

The device works as follows.

To the input of the synchronization unit I by ctynaiOT external trigger signals, and at its outputs synch pulses are generated, which are transmitted to blocks 2 and 3 of the horizontal and vertical scanning, to the 4-character generator and determine the time sequence of their operation. Blocks 2 and 3 form the deflection of the step-sawtooth form currents (which, having flowed through the coordinate coil 11, provide a discrete raster scan on the CRT screen 10. The number of steps in the horizontal signal equals the number of familiarity in the information line, and the number of steps in the signal sweep - the number of information lines in the frame.When this stage at the horizontal scanning signal have a different (single or double) value, and all steps at the frame scanning signal - the same value.

At each point of the intermediate stop of the beam of the CRT 10, the symbol is reproduced in accordance with the code received at the input of the generator 4 symbol-s. The generator 4 converts the input code into the currents of the functional symbol sweep, which flows through the sign deflection of the coil -12, and into the backlight control pulses of the symbols that trigger the trigger 5. The output signals from the trigger 5 are amplified in amplitude, amplitude in the modulation unit 6 and transmitted to the modulating output of a CRT 10; In addition, generator 4 generates a burst of pulses (the end-of-character signal), the number of which is equal to the maximum possible number of characters in the information line, i.e. the number of pulses in the burst for the selected constant table permanently. This signal is transmitted to the input of the distributor 7. A serially connected distributor 7, block 8 of the OR elements and switch 9 perform the function of a programming device for the tabulation operation for a specific set of tables. The distributor 7 divides the burst into single pulses, which are transmitted to block 8 of the OR elements, where new burst of pulses are formed, the number of which is twice as large as a given set of tables. However, through the switch 9 at each moment only two bursts of pulses are transmitted, which arrive at the counter 13 of block 2. One batch of pulses is fed to the low-order bit of counter 13, and the second pack to the second most significant bit of the counter 13. Each pulse of the first pack corresponds to steps of a single magnitude, and each pulse of the second pack of a step of double magnitude in a component of the horizontal scanning signal.

The counter 13 together with the digital-to-analog converter 14 and the amplifier 15 converts the serial code of two bursts of pulses into a step-saw-line horizontal scanning signal, the magnitude of the steps in which corresponds to the displayed table. .

Block 3 frame scan has

a structure similar to block 2. At its entrance one batch of pulses from synchronization unit 1 is fed, and a step-saw-shaped signal is formed at the output with equal steps in size (all information lines on the CRT screen IO are located at equal distances from each other friend).

If it is necessary to display two or more tables on the common screen, the signal from block 3 (starting with a certain row) switches the switch 9, and two other bursts of pulses (with a different combination of pulses in the pack) are sent to the counters 13 of block 2.

The ability to tabulate the displayed information provides improved image quality, thereby increasing read accuracy and increasing the productivity of operators,

  :. .

Claims (1)

Invention Formula ; A device for displaying information on the screen of an electron beam tube containing a synchronization unit connected to a symbol generator, line and frame scanner blocks, the outputs of which are connected to a deflection of a CRT gun, the output of the generator 6) 8 is connected to a trigger that connects to the unit modulation associated with a CRT modulator, characterized in that, in order to improve the display accuracy and to expand the application area of the device by allowing the tabulation of alphanumeric information Without reducing the information capacity of the frame, it contains serially connected pulse distributor, OR element blr and switch, the first distributor input is connected to the synchronization unit, the second input is connected to the symbol generator, another input is connected to the vertical scanning unit, and the output is to the horizontal block sweep .: Sources of information taken into account in the examination 1, Soloveychik I, E, and others. Electronic devices of the device {1aa (en 11 information in automatic communications systems). MV Link, 1973, p. 21-28, fig. 2, 7.,:;;,.:: .:; -.-, .-;.. 2, USSR Copyright Certificate 8 L14589, item O 06 Fra / 14 ,. 1974. 3, USSR Copyright Certificate No. 469127, C 06 F 15/20, 1975.