SU1062762A1 - Device for displaying onto crt display screen - Google Patents

Abstract

A DEVICE FOR DISPLAYING S1MVOLS ON THE SCREEN ELECTRON-BEAM TUBE (CRT) containing serially connected input register whose input is the first input of the device, the decoder and the symbol generator, the first pulse distributor whose input is the second input of the device, and the adder, the outputs of the first pulse distributor connected to the inputs of the character generator, the first you-. the course of which is connected to the deflecting system of a CRT, and the second to the first input of the adder, the output of which is connected to the modulator of the CRT, which, in order to expand the field of application of the device by increasing the information the capacitance of the displayed symbols by moving along the contour of the symbol of the light point, it contains a series-connected reversing counter, an element AND, a second pulse distributor, a group of elements AND, the second inputs of which are connected to the inputs of the first pulse distributor, and the OR input, the output of which is connected to the second input of cyNoxaTOpa, is the first input of the inverter (the LIVE counter is connected to the input of the first pulse distributor, the second and third inputs of the reversible counter are the third and quarter inputs of the device, the second input of the I-fifth input device .

Description

The invention relates to automation and computing, in particular, to devices for outputting and reproducing symbols on a screen of a cathode ray tube and can be used in display devices for symbolic (sign) information of automated control systems using digital computers.

A device is known for displaying symbols on a CRT screen containing character generators using a character configuration memory block 1.

This device (besides the symbol memory block, contains a selection circuit consisting of serially connected register and decoder, and a pulse distributor connected to a pulse generator. From the memory block output, signals are output on the CRT backlight | PI a raster as a result of highlighting its individual elements when a CRT beam sequentially traverses all the constituent elements of a symbol.

A disadvantage of this device is the possibility of encoding (distinguishing) characters only by their form. .

Closest to the invention is a device for displaying symbols on a screen of a cathode ray tube, comprising a serially connected input register and a descrambler connected to the inputs of the zaprosha. symbol devices (symbol generator), the other inputs of which are connected to the outputs of the control / distributor device}. The character code is fed to the input register, a clock pulse is sent to the distributor, and signals from the deviation and illumination of the CRT 2 are output from the memory device.

The device provides the display of a symbol on the CRT screen as a result of highlighting its elements while sequentially traversing the CRT beam of the symbol in each cycle of information regeneration. With a Fpap 50 Hz regeneration rate, the character on the CRT screen is perceived as static. When a luminance code is received with a character code, the character may be displayed on a CRT with different brightness.

A disadvantage of the known device is the possibility of encoding (distinguishing) characters only by two signs: by their form and brightness, which limits the information capacity of the display device.

The aim of the invention is to expand the field of application of the device.

by increasing the data capacity, displayed "x symbols by moving around the contour of the light point symbol.

The speed and directions of movement of the light point can be different, which makes it possible, for example, to distinguish objects moving at different speeds and directions.

This goal is achieved by the fact that the device for displaying characters on the screen of a cathode ray tube (CRT), which contains serially connected input registers, whose input is the first input of the device, the decoder and the symbol generator, the first pulse distributor, whose input is the second input of the device and The adder, the outputs of the first pulse distributor are connected to the inputs of the symbol generator, the first output of which is connected to the deflection system of the CRT, and the second to the first input of the adder connected to a CRT modulator, a series-connected reversible counter, an element P, a second pulse distributor, a group of elements AND, the second inputs of which are connected to the outputs of the first pulse distributor, and an OR element whose output is connected to the second input of the adder, the first the input of the reversible counter is connected to the input of the first pulse distributor, the second and third inputs of the reversible counter are respectively the third and fourth inputs of the device, the second input of the element and the fifth input are arranged real estate.

The drawing shows a block diagram of the device.

The device contains an input register 1, a decoder 2, a symbol generator-3, a first distributor of 4 pulses, an input of 5 clock pulses (second input of the device), information input 6 of the character code (first input), output 7 on a CRT backlight circuit (CRT modulator), output 8 on the circuit of deviation of the CRT (deviation of the na system), reversible counter 9, element 10 AND, second distributor 11 pulses, group 12 elements AND, element 13 OR, adder. 14, the input 15 controlling the reverse (the third input of the device), the input 16j controlling the division factor (the fourth input), the input 17 controlling the activation of the feature (the fifth input).

The device works as follows.

Input code 1 records the character code. The code goes to the decoder 2, which, in accordance with the code, selects the microprogram of the symbol in the generator of 3 characters. : The input 5 of the first distributor of 4 pulses receives clock pulses with a frequency f, which it converts into a series of shifted pulses with a duration of 1 / f for polling the microprogramme of the symbol. Each polling pulse reads from the symbol generator the pulse codes of the deviation by two coordinates) and illumination, which are fed to the output of the illuminated circuit 7 and the circuit 8 of the deviation of the CRT. The duration of the pre-light pulses is С. The number of polling pulses Ы corresponds to the number of symbol elements. When interrogating the entire microprogram of the symbol, forks signals that cause & consecutive movement of the CRT beam along the elements of the symbol contour from the first to the N-ro. When regenerating a character code with a frequency Fpgr 50 Hz i.e. When interrogating the symbol firmware 50 times per second, the character on the CRT screen is rendered static. A permissive potential is applied to the control input of the feature switch 17. The control inputs 15 of the reverse switch and the inputs 16 of the division factor are in the initial state. The frequency pulses F from the reversible counter 9 through the element I-10 are fed to the input of the second pulse distributor. Pulses of the F series are fed to the inputs of the AND 12 group of elements, where they are selected by the same pulses of the f series and collected on the OR 13 element. As a result, a sequence of pulses with a duration t 1 / f with a frequency of 7 turns of pulses F, F, with a repetition rate in a burst of pulses. Fjj Fper PR of this, the pulses of the first burst coincide with the first polling pulses, the pulses of the second burst with TORES1-1I polling pulses, etc. | before the I-th survey pulse. From the output of the element OR., The pulses from the first to the N-ro are fed to an adder 14, which is summed with the pulses coming from the output of the symbol generator. In this case, in each series of illumination pulses fed to a CRT in the regeneration cycle, a single pulse with a larger amplitude appears. Such an impulse causes a sharper candle; character element on a CRT screen. The position of the luminance element on the CRT screen varies from the first to the Nth element of the symbol synchronously with the frequency. The time of action of the capacitive element is determined by the time. It is in progress of the resolving potential at the control input 17. When used,; By setting a CRT phosphor with an average time after luminescence, and a frequency F within 5fl7 Hz, the device creates on the CRT screen the illusion of moving the brightness element along the contour of the symbol. When the potential at input 15 changes, controlling the switching of the reverse of the counter-divider, the sequence of the appearance of pulses at its outputs, and hence at the output of the backlight amplifier, is reversed {from the N-th to the first). Accordingly, the direction of movement of the loudness mark will change. ; When the potential changes at the input 16, which controls the switching of the division ratio of the counter-divider, the frequency of occurrence of pulses at its outputs, and, consequently, at the output of the counting amplifier, changes, respectively, the speed of the loudness mark. The invention makes it possible to increase the information capacity of the symbols displayed on the CRT screen by moving the loudness mark along the contour of the symbol with different speeds and in different directions.

Claims (1)

DEVICE FOR DISPLAYING SYMBOLS ON THE ELECTRON BEAM TUBE (CRT) SCREEN, containing a series-connected input register, the input of which is the first input of the device, a decoder and symbol generator, a first pulse distributor, the input of which is the second input of the device, and an adder, the outputs of the first pulse distributor connected to the inputs of the symbol generator, the first you-. the path of which is connected to the CRT deflecting system, and the second to the first input of the adder, the output of which is connected to the CRT modulator, characterized in that, in order to expand the scope of the device by increasing the information capacity of the displayed symbols by moving along the circuit symbol of a light point, it contains a series-connected reversible counter, an AND element, a second pulse distributor, a group of AND elements, whose second inputs are connected to the outputs of the first pulse distributor, and an OR element, in the output of which is connected to the second <d input of the adder, the first input of the reversing counter is connected to the input of the first pulse distributor, the second and third inputs of the reversing counter are the third and fourth inputs of the device, the second input of the And element is the fifth input of the device.