SU638992A1 - Device for displaying information on crt screen - Google Patents

Description

one

The invention relates to the field of automation and computer technology and pre-design for devices displaying information on the screens of electron beam indicators.

A device is known comprising a sinusoidal voltage generator, a null organ, a control unit, a generator of counting angles, a phase-shifting circuit, key points, comparison units, controlled resistors, digital-analog converters, beam deflection amplifiers, a brightness adjustment unit, voltage adders and electron beam tube (CRT) l.

However, this device can draw only figures formed by arcs of circles on a CRT screen.

The closest to the invention in terms of technical essence is a device containing a compressor unit connected to a control unit connected respectively to the first inputs of the symbol generator, the symbol sweep generator,

an arithmetic unit, a vector generator, a circular arc generator, a memory block whose output is connected to the second inputs of symbol generators, vectors, circular arcs and an arithmetic block, the first outputs of a generator of symbol sweepers, vectors and circular arcs are connected to the third, fourth and fifth the inputs of the arithmetic unit, the output of which is connected to the first input of the ELT.tube, the second output of the symbol sweep generator is connected to the third input r of the iepa-torus of characters, the first output of which is connected to the second input of the CRT cuttings second outputs of the character generator, vectors and arcs associated with the first, second and third inputs modulation unit, whose output is connected to a third input of the CRT tube, the second output voltage sotf unit connected to the second input of the memory unit L2J.

Claims (2)

However, the known device consumes high power. The aim of the invention is to reduce the required consumption. To do this, triggers to the keys are introduced into the known device, with the first inputs of the first, second and third triggers respectively connected with the first; the fourth and fifth outputs of the control unit, the second inputs of these flip-flops are connected to the output of the control unit, and the outputs are connected to the first inputs of the first, second and third keys, the output of the first key is connected to the third input of the symbol generator and the second input of the symbol sweep generator, outputs The second and third keys, respectively, are connected to the third inputs of the vector generators and circular arcs, the outputs of the control unit are connected to the inputs of the fourth trigger, the first and second outputs of which are respectively connected the first inputs of the fourth and of the keys, the second inputs of all keys associated with the power bus, the fourth key output coupled to an input of co- p zhen1Sh unit, an output of the fifth switch is connected and a fourth input of the modulation input and the sixth arithmetic unit. The diagram shows the structural scheme of the device. The device contains a block 1 matching memory block 2, a control block 3 and a generator of 4 characters, a generator of 5 open characters, a generator of 6 vectors, a generator of 7 circular arcs, a block of 8 modulation (luminance), arithmetic unit 9, cathode ray tube 10, triples, switches 15-19, bus 2O Source availability I power bus 21 and communication channel 22 with information source Voltage supply is permanently connected to bus 21, CRT 1O, block 2 shmity, block 3 controls, triggers and keys (not shown in the diagram). The device operates as follows: Bus 20 sends the Ready signal of the source to the input of the control unit 3, while the control unit 3 generates signals that set the triggers 11, 12 and 13 to the state O, and the trigger 14 to the state 1 opens the key 15 and through it, the supply voltage goes to the unit 1 mains supply, and the keys are 16-19, so the supply voltage from the generators 4, 5, 6 and 7, from the blocks 8 and 9 is turned off. According to the signals of the block 3, the alphanumeric block 1 carries out the exchange signals with the information nsting, monitors the information received at the input and writes it to the memory block at the addresses generated by the control block 3, at the time of termination of communication with the source of information 1 switches the trigger 14 to the zero state at which the key 15 is closed, therefore, the supply voltage is removed from the interface unit 1, the key 16 is opened and through it to the luminance modulation unit 8, and the supply voltage is supplied to the arithmetic unit 9 ix. In addition, the control unit 3 generates signals which, depending on the nature of the information received, set one of the triggers 11, 12 and 13, respectively, into one state. In terms of voltage levels from the outputs of these flip-flops oi, the corresponding keys are covered and through them the supply voltage is applied to one or another generator. The coordinate codes of the source points are delivered from memory block 2 directly to the arithmetic unit, then they are converted into CRT beam deflection signals, on the screen of which a point is displayed in a certain place (1 X O & transducers and amplifiers are not shown in the diagram). If a vector and a multi-character formula are to be displayed next to a dot, the work will be carried out in the following order. After the coordinates of the initial point are entered into the arithmetic unit 9 with some delay necessary for completion of the transient processes in the deflecting system of the CRT, the control unit 3 sets the trigger 12 to one state, opens the key 18 and applies the ground voltage to the vector generator 6. Control unit 3 reads information from memory block 2 and enters the code of the vector projections on the coordinate axes into the vector generator 6, which generates the increments of the vector projections. These codes are passed through a group of elements OR in an arithmetic unit, summed (or subtracted), and gp are converted into CRT beam deflection signals. By the end of vector signal from generator 6, control unit 3 sets trigger state 12, trigger state 1 trigger 11 and the voltage is removed from the vector generator 6 and supplied to the 4 character generator and the 5 character scan generator. These generators work together in start-stop mode. The 4 character generator receives from the memory block a code of a digit or letter, forms the corresponding signals for drawing on the CRT screen with the help of the sign of the deflection system of the corresponding characters. As soon as the sign display ends, the 4-character generator outputs to the character-scan generator 5 an end-of-sign signal. On this signal, the generator 5 generates codes of increments along the axes JC and Y 1, i.e. the address of the starting point of the next character, and in block 3 of the manager of the request message for reading from block 2 of the memory of the code of the next character. The operation process continues until the end of the display of the last character (of the given group of characters), with the generator of the five revisor symbols output to the control unit 3, the end of operation signal. According to this signal, control unit 3 provides for relieving voltage from generators 4 and 5 and outputting voltage to another functional unit. In case it is necessary to draw a circle or arc on screen E.1T, unit 3 provides voltage output through trigger 13 and a key 19 to the generator 7 of circular arcs and reading information about the circumferential from block 2. The generator of 7 circular arcs generates codes for drawing on the CRT screen the line segments that approximate the circle (circular arc). These codes, through the group of elements OR, are added to the summation (subtraction) in the arithmetic unit 9 and, moreover, are formed into the signals of the deflection of a CRT beam. At the moment the circle (arc) display ends, the generator 7 circumferential voltage is removed. 4 symbols, 6 vectors and 7 circular arcs at certain points in time, the signals of the CRT beam come to the inputs of the brightness modulation unit 8, Circuits 4-7 are provided in the generator, which with some delay relative to the moment of turning on the voltage are set The memory modules included in the specified generators are in certain initial states. This delay is taken into account by the control unit 3 when; Reading information from memory block 2 for input into the corresponding generator. Compared with the known technical solution, the proposed device allows to significantly reduce power consumption, reduce the dimensions of power sources, which allows making the device more compact. Apparatus of the Invention A device for displaying information on a screen of a cathode ray tube, comprising a interface unit connected to a control unit connected respectively to the first inputs of a symbol generator, a generator of unrolled symbols, an arithmetic unit, a vector generator, a generator of arcs of circles, a memory block, an output which is connected with the second inputs of the generators of symbols, vectors, arcs of circles and arithmetic unit, the first outputs of the generators of the sweep of symbols, vector and circles are connected to the third, fourth and fifth inputs of the arithmetic unit, the output of which is connected to the nepBbiM input of the electron-beam, the second output of the generator of raevertkn characters is connected to the third input of the character generator, the first output of which is connected to the second input of the cathode ray tube, the second outputs are gey {a7 The symbol poles, vectors, and arcs of circles are connected to the first, second, and third inputs of the modulation unit, the output of which is connected to the third input of a CRT, the second output of the interface block is connected to the second input of the ka pamnt.i about. It is worth noting that, in order to reduce power consumption, Tr1 gages and keys were entered into it, with the first inputs of the first, second and third flip-flops connected respectively to the first, fourth and fifth outputs of the control unit, the second inputs of these flip-flops are connected to In the code of the control unit, and the outputs of the Connection Hetibf with the first inputs of the first, third and third keys, the output of the first key is connected to the third input of the character generator and the second input of the generator to expand the characters, the outputs of the second and third keys, respectively connected to the third inputs of the vector generators and circular arcs, the outputs of the control blocks connected to the inputs of the fourth trigger, the first and second outputs of which are respectively connected to the first inputs of the fourth and fifth keys, the second inputs of all keys are connected to the buses (power supply, the output of the fourth key connected to the input of the unit of the interface; en, the output of the fifth key is connected to the fourth input 638992 modulation unit and the sixth input of the arithmetic unit. Sources of information taken into account in the examination: 1, copyright certificate SSSG- № 417783, CL.O 06 f- 3/14, 1974. 2. US patent number 3836890, cl. 340-172.5 (G 06 P 3/14), 1974.