SU826409A2 - Device for displaying information on crt screen - Google Patents

Description

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

one

The invention relates to automation and computing, can be used in the output of information from processing devices on a CRT screen in automated control systems (ACS).

According to the main author. St. No. 450204, a device for displaying information on a CRT screen is known. It consists of a receive bus, a symbol code, a recording unit, a symbol memory block, a memory polling unit, a vector code register, a beam illumination code decoder, a beam modulation unit, a vector length code decoder, a vector orientation code decoder, an assembly code encoding blocks of X and Y coordinates of the beam deflection, two-pole current keys of the X and Y coordinates, integrators of the X and Y coordinates, amplifiers of horizontal and vertical deflection, comparison circuits, and a symbol code 1 bus.

This device allows a relatively high speed to be achieved by reducing the number of micro-tacts required to form the symbols.

The disadvantage of such a device is that it still has a relatively large number of micro-tacts, due to the need in the process of forming symbols with a piecewise-linear approximation of the reference to a block of symbols when forming each new vector whose direction differs from the previous one. This, in

turn, leads to an increase in the memory block of characters and reduces the speed of the device. A decrease in the speed of the symbol-forming device may in some cases not provide the necessary throughput of the display equipment of the ACS, which reduces the efficiency of its use.

The purpose of the invention is to increase the speed of the symbolization device.

This goal is achieved by reducing the number of micro-tacts and introducing sequentially connected sources of shapers of the reference voltages to the corresponding boundaries of symbol formation zones and comparators in X and Y coordinates, the third inputs of which are connected to the Outputs of the X and Y coordinate integrators, respectively, and the outputs of the Comparators in X and Y coordinates U connected to the third inputs of the coding blocks of the coordinates X and Y, respectively. FIG. 1 shows a functional diagram of the device; in fig. 2 - a) diagrams of the formation of the symbol "On the proposed device; b) the same, famous. A device for displaying information on a CRT includes a bus 1 for receiving a character code, a block 2 for recording, a block 3 for memory of symbols, a block 4 for interrogating memory, a register 5 for a vector code, a decoder 6 for beam illumination, a block 7 for modulating a beam, a decoder 8 for length code vectors, decoder 9 of the vector orientation code, assembly scheme 10 encoding block1. 11 X-ray deflection coordinates, coding block 12 Y-ray deflection coordinates, two-pole current coordinate keys X 13 and Y 14 X coordinate integrators X 15 and Y 16, 17 horizontal amplifiers and 18 vertical beam deflection, X 19 and U 20 comparators, drivers the reference stresses along the coordinates X 21 and Y 22, the circuit 23 of the match, the bus 24 of the query. In accordance with the character code received on the reception bus 1 to the recording unit 2., in block 3, the polling address inputs that are individual for this symbol are prepared. At the end of the preparation, a memory interrogation unit 4 is started, which sequentially polls the character memory block 3. In each polling cycle from the outputs of block 3, the code of the next vector, which forms a symbol, enters the code 5 register. In the known information display device on the CRT screen, the interrogation of the character memory unit 3 was carried out with each change in the direction of the generator of the character. In the proposed device, at the boundaries of the character forming zone, the change of direction of the generator of the symbol occurs automatically. By formation zone is meant the area occupied by one symbol on the CRT screen. In this case, the boundaries of the zones of the formation of symbols (+ Llx, -Ij-x, +, -Uy) are specified by the shapers of the reference voltages. An automatic change in the direction of the generator occurs by issuing a command to prohibit the control signals of the integrator from the X and Y coordinates from the respective comparators, when the voltage at the integrator output reaches one of the zone boundaries. When forming the symbol "O" (Fig. 2), the block 3 of the symbol memory is interrogated when the direction of the vector is changed at points 2-8. In this case, the vector information from the vector 5 code register is transmitted to the beam illumination code 6 decryptor, the vector V length code decoder and the vector decoder code vector orientation 9. The vector length and orientation codes defining the generator of the character on this character generation screen are sent to the coded coordinate blocks X and Y beam deflection 11 and 12. Encoding units 11 and 12 convert the polar coordinates of the vector's end point to decarters and provide control signals to dual current keys 13 and 14. Signals are received from the outputs of keys 13 and 14 and integrators of coordinates X and Y - 15, 16 and further on amplifiers of horizontal and vertical deflection of beam 17 and 18, as well as on comparators on coordinates X 19 and Y 20. Signals are sent to the second inputs of comparators from shapers of reference voltages 21 and 22 The shapers of the reference voltages emit signals corresponding to the boundaries of the symbol formation zone (-i-Ux, -Ux, + Uj, -Uy) (Fig. 2). Voltages at the outputs of the integrators of the coordinates X and Y - 19 and 20 should not exceed these values. The invention proposes in the process of forming symbols to use the boundary values of the stresses of the zone of formation of symbols for generating commands to control the coding blocks of the coordinates 11 and 12 of the beam deflection. Developed at the time when the voltage at the output of the integrators 15 and 16 exceeds the voltage values corresponding to the boundaries of the symbol formation zone, the control commands are supplied from the outputs of the comparators 19 and 20 and provide automatic interruption of the control signals issued from the coding blocks of the coordinates And and 12 to the two-pole current keys 13 and 14 that caused this overvoltage. Automatic interruption of control commands causes a change in the direction of the vector forming without additional reference to the block 3 of the memory of symbols. In the process of forming the symbol "O", such an automatic change of the vector of the generator of the symbol occurs in sections 2-3, 3-4, 4-5 symbols (Fig. 2a). The voltage from the outputs of the amplifiers of the horizontal 17 and vertical 18 deflection of the beam is fed to the deflection systems of the indicator. The modulation of the beam brightness in the process of forming the symbol is produced by signals from the output of block 7, controlled by commands from the decoder of the beam illumination code 6. Upon completion of the drawing of the last vector belonging to the symbol generator, signals from the outputs of decoders 6 and 8 open a matching circuit 23, the output of which sets the integrators X and Y 15 and 16 to the initial state, block 2 records, block 4 of the memory poll, register 5 of the vector code and by request string 24 sends a request signal to the successive character code. Thus, the proposed device, consisting of the device according to the author's certificate No. 450204 and entered by the comparators on the X and Y coordinates and the reference voltage generators of the X and Y coordinates, expands the capabilities of the main device and increases the efficiency of its use as part of the information display equipment on CRT screen by increasing the speed of the device. At the same time, the volume of the memory block was reduced, which resulted in a reduction in the weight and size characteristics of the entire device.

Claims (1)

Invention Formula A device for displaying information on the screen of a cathode ray tube St. No. 450204, characterized in that, in order to increase the speed of the device, a series of coupled shapers of reference voltages corresponding to their characters and comparators along the X and Y coordinates are added to the device, the third inputs of which are connected to the outputs of the X and Y coordinate integrators , the third inputs of which are connected to the outputs of the integrators of the coordinates X and Y, respectively, and the outputs of the comparators on the coordinates X and Y are connected to the third inputs of the coding blocks of the coordinates X and Y, respectively. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 450204, cl. G 06 K 15/20, 1974 (prototype). 7, I7x s (pU. 2.