SU955182A1 - Device for displaying image on cathode-ray tube screen - Google Patents

Description

The invention relates to computing and can be used in the design of display devices.

A device for displaying information on a CRT screen is known, comprising a register, a decoder, an AND element, sweep voltage drivers, etc. one.

The closest in technical essence is a device for displaying information on a CRT screen containing AND, OR, generators of impulses, spreading spruce of micro-tacts, delay element, register, deflecting voltage drivers, etc. 2

. The main disadvantage of the known devices is the considerable amount of equipment due to the storage of the generalized structure of the half-frame figure and the storage of the backlight function even of those elements through which the electron beam passes more than once.

The purpose of the invention is to simplify the device.

The goal is achieved by the fact that the device for displaying information on the screen of a cathode ray tube (CRT), contains a pulse generator, the input of which is connected to the Start signal bus, the output to one of the inputs of the first and second elements AND and the distributor of micro-tacts, the first output of which connected to the input of the delay element and one of the inputs of the first element OR, the second output 10 with the other inputs of the first element OR, the third with one of the inputs of the second and third elements OR, the fourth with the other input of the second element OR-coagulant and the first input of OR chet15 Werth, fifth - to another input of the first AND gate, one input of the fifth element Ilia second input of the fourth OR gate, the third input of which

20 is connected to the output of the first element OR, the output to the other inputs of the third element OR and the second element AND, the output of which is connected to one of the inputs of the register,

25 another input — which is connected to the signal bus; Symbol code, the output of the delay element is connected to another input of the fifth OR element, a trigger connected by a counting input 30 dcm to the output of the first AND element,

the outputs of the first, second, sixth and seventh elements OR are connected to the corresponding inputs of the deflecting voltage formers in the X and Y coordinates, the outputs of which are connected to the deflecting systems of a CRT, the third, fourth, fifth, sixth, seventh and eighth elements AND, the sixth output of the micro-clock distributor is connected to one of the inputs of the third, fourth and fifth elements AND, the output of the third element AND is connected to the fourth input of the fourth element OR, the output of the fifth element OR is connected to one of the inputs of the sixth and seventh And, a single trigger output is connected to other inputs of the sixth and fourth I elements and a signal bus. The end of the symbol display, the zero output of the trigger is connected to other inputs of the seventh, fifth and third elements And, outputs of the fourth, fifth, sixth and seventh elements And connected to the corresponding inputs of the sixth and seventh elements OR, the output of the third element OR is connected to one of the inputs of the eighth element AND, the output of the register is connected to another input of the eighth element AND, the output of which is connected to the modulator EL T Figure 1 shows the block diagram of the device; figure 2 - polygram.

The device for displaying information on the screen of a CRT contains a generator of 1 pulses, a distributor of 2 micro-tacts, an element of 3 delays, elements AND 4, OR 5, trigger 6, elements AND 7-11, elements OR 12-17 element AND 18, drivers 19 and 20 deviation X and Y coordinates, register 21, electron tube 22 with systems 23 and 24 deviations U and Y coordinates and modulator 25, element 26, signal bus 27, symbol code, bus 28, start signal, bus 2 -9 End of character display.

Pulse generator 1 generates a sequence of pulses with a follow-up period equal to fg,

The micro-tact distributor 2 contains six outputs and operates in such a way that with the arrival of a pulse from the output of the pulse generator 1, a high potential is removed only from its first output, with the arrival of a second pulse — a high potential is removed only from its first output, with the arrival of a second pulse — high the potential is removed only from its second output, and the like.

The cycle of operation of the distributor 2 micro-tacts is equal to b tj. The polygram (Fig. 2) is formed in two cycles of operation of the distributor 2 micro-tacts.

each element from 30-39 polygrams is formed during time t, except elements 33 and 38, which are formed during time. The control of the illumination and the elements 33 and 38 is also carried out over time.

2 / o. This is ensured by the fact that the code of the light in the receiving register 21 is shifted depending on the state of the distributor 2 micro-cycles

0 certain outputs of which are switched to the dynamic input of the register 21 through the elements And 7 and 18, OR 12, and the input of the distributor 2 micro-tacts is delayed

5 for the response time of the element I. The control signals for the illumination of the elements of the polygram to the modulator z 25 are fed through the elements OR 17 and AND 26.

Q Elements 30, 31, 35 and 36 polygrams (figure 2) have areas that are oriented differently in space. The duration of the formation of each such area is equal to O, 5p. It is the formation of the necessary deflection voltages for these elements that provides the delay element 3 with a constant delay), 0.5 (0 Introduction to the circuit of elements And 7 and 26 makes it possible not to highlight the element 8 of the polygram, which the electron beam passes twice. This reduces code illumination for one bit (compared with the prototype).

5, in the initial state, none of the outputs of the micro-tact distributor 2 is excited. The trigger 6 is in the state O, which corresponds to the operation of the device on the first

0 its cycle.

The device operates as follows.

On a start signal at a rate of 28 in an eight-digit receive register 21

5, the symbol code is entered via the bus 27 of the symbol code. On the same signal, a pulse generator 1 is started. The first pulse from the output of the generator 1 does not pass through the element And 18, since the input of the micro-tact distributor .2 is delayed. From the first output of the micro-clock distributor, the potential acts on the summing input of the deflection voltage generator 20 at the Y coordinate through an OR 15 element. At the same summing input of the deflection voltage generator 19 at the X coordinate, this potential is supplied to the detainees by 0.5 through element 3

0 delays, elements OR 5, and 8 and OR 13. Thus, the voltages necessary to form the first element of the polygram are removed from the outputs of the formers 19 and 20.

5 These voltages are applied to the corresponding system 23 and 24 by the deviation of X and У of the CRT 22. The potential from the output of the element OR 15 through the elements OR 12 and 17 goes to one input of the element 26 and permits the passage of the illumination code, the first element of the polygram to the modulator z 25 CRT 22 If the first bit of the receiver contains HCTpa 21, then the signal on the modulator z 25 arrives. if it is contained, then it is not a post. The second pulse passes through the element 18 and shifts the code of the backlight of the character in the receiving register 21. At the second cycle of operation of the device, the potential from the second output distributes the bodies of 2 micro-tacts through the element OR 15 to the summing input of the driver 20 and generates a deflection voltage at its output Y coordinate required to form the second element of the polygram. The summing input of the driver 19 through the elements OR 5, AND 8 OR, 3 for 0.5tg at the second cycle will continue to be affected by the potential from the first output of the distributor 2 micro-tacts, delayed by element 3 of the delay. Otherwise, the operation of the device on the second cycle is similar to the operation on the first cycle. On the third, fourth, and fifth clock cycles, device operation is similar to that on the second cycle. The difference in the third cycle is that the potential from the third output of the distributor 2 micro-strokes affects the subtractive input of the imaging device 19 through AND 10, OR 14 elements. Through the AND 7, OR 12 elements, this potential allows the fourth shear pulse to pass through the And 18 element to the dynamic the input of the receive register 21. The control signal is not supplied to the imaging unit 20 in the third cycle. On the fourth and fifth cycles, the operation of the device is different in that from the fourth and fifth outputs of the distributor 2 microtacts, the potentials act through the OR 16 element on the subtractive input of the driver 20 The illumination on the fourth clock is controlled, min by the OR 12 element, directly through the OR 17 element This makes it possible not to shift the code of illumination of the symbol p. When the fifth pulse passes from generator 1, since element 4 of the polygram is formed over time. At this time, the driver 19 is not sent control signals. The sixth IMPULSE shifts the character code in the receiving register 21. The contents of the first register bit 21 are the highlight code of the element 5 of the polygram. The illumination is controlled from the sixth output of the distributor of 2 micro-cycles through the elements OR 12, 17, and 26 in accordance with the contents of the first register bit 21. In addition, the potential from the sixth output of the distributor of microstates 2 through the elements of OR 5, AND 8, OR 13 acts The summing input of the driver 19. The driver 20 is not fed to the driver 20 in the sixth cycle of operation of the device. With the arrival of the second pulse, the second cycle begins. The operation of the device on the second cycle is similar to the operation on the first cycle. The difference is as follows. The seventh impulse will transfer the trigger 6 through the element 4 and 4 to the state and the signals from the outputs of the distributor of micro-cycles 2 will be fed to the formers 19 and 20 not through the elements 8 and 10, but through the elements 9 and 11. the potential from the ninth output of the distributor of 2 micro-shots through the element 7 does not pass to the control of the illumination, since there is no need to highlight the element 37 of the polygram. With the arrival of the ninth pulse, the illumination code of the element 38 generated in time 2t (j. The tenth and eleventh pulses of the character code in the register 21 do not shift.) In addition, the twelfth pulse from the generator 1 shifts the character code and clears the register 21. Thus, the element 39 of the polygram on the twelfth cycle is not highlighted, as it is necessary. The thirteenth pulse translates the trigger 6 into the state O, the signal End of the character display is removed from its single output. This device allows, while maintaining high reliability, a large range of symbols and high noise immunity, reduce information costs by more than 10%. This is achieved by using the character code that is eight-bit and not nine-bit (like in the prototype). This also reduces hardware costs by reducing the amount of memory required to store character codes (not shown), also by more than 10%. In addition, the exclusion from the circuit of analog elements increased the accuracy of character reproduction and reduced the intensity of the thermal mode of operation of the deflecting system of a CRT.

Claims (2)

1. Author's certificate of the USSR 651337, kl. About K K 15/20, 1979. 2. Authors certificate of the Russian SSR according to application 2771683 / 18-24, cl. G 06 K 15/20, 1979 (prototype).