SU964704A1 - Device for displaying information on cathode-ray tube screen - Google Patents

Description

(54) DEVICE FOR DISPLAYING INFORMATION ON SCREEN ELECTRON-RAY TUBE

The invention relates to computerized automation and can be used to build information display devices on an electron-beam tube.

A device is known that implements a polygram method of displaying visual symbols when using a piecewise linear method of approximating control voltages}.

The closest to the proposed technical entity is a device for displaying information on a cathode-ray tube screen, containing a pulse generator, a register, a micro-clock distributor, a driver of control signals, a trigger, a delay element, AND elements, and an OR 2 element.

A disadvantage of the known device is its limited functionality, low speed, since it is synchronous, and the presence of an unproductive electron beam path.

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

The goal is achieved by TeMj that the device contains a pulse generator connected to the micro-clock distribution, the first output of which is connected to the output of the i-shaped body of control signals, the output of which is connected to the deviation bus along the X coordinate, the register connected to the bus Symbol code trigger , elements AND OR, introduced the second and third triggers, the second element OR, the elements AND-NOT, OR-NOT, Prohibition, with

ten . This second output of the micro-clock distributor is connected to the counting input of the first trigger and to one input of the first OR element, the other input of which is connected through the Inhibit element

15

with the first outputs of the micro-tact distributor, and the output to one of the inputs of the driver of the control signals, the other input of which is connected to the third output of the driver

20 mKt) OTacts, and the output is with the deviation bus along the Y coordinate, the unit output of the first one, the trigger is connected to the counting input of the second trigger, the unit output of which is connected to the second

25 entrance of the first element of the ban, but

inverse output connected to the first. the input of the first element And, the second input of which is connected with the inverse output of the first trigger, the third

30: input of the first element AND connected to

the output of the pulse generator, the first input of the distributor of micro-tacts and the second input of the register, the fourth input of the first element AND, is connected to one input of the OR-NOT element and the output of the first element AND-NOT, and the output is connected to the second input of the distributor of microstates and c. unit inputs of the third trigger, the unit output of which is connected to one of the inputs of the second element AND, to one of the inputs of the second element Prohibition: AND to the second input of the element OR NOT, the output of which is connected to one input of the second element NAND, the second input of which is connected with the first sixth outputs of the register, and the output with the bus End of the character, the seventh ninth outputs of the register are connected to the inputs of the first NAND element, the first output of the register is connected to the second input of the second element, the output of which is connected to the first input of the second element that OR, the second input of which is connected to the ninth output of the register through the element Ban, a. the output is connected to the backlight bus.

HS FIG; 1 shows a functional diagram of the device; in fig. 2 - polygram formed by the device; in fig. 3 - graphs explaining the principle of operation of the device. .

The device for indicating the cathode-ray tube to the screen contains a generator of 1 pulses, a distributor of 2 micro-strokes, the first 3 and second 4 triggers, a register 5, drivers 6 and 7 of control signals, the first element OR 8, the Ban element 5, the element AND 10, the third trigger 11, elements AND-NOT 12, element OR-NOT 13, element AND-NOT-14, element AND 15, element Prohibition 16, element OR 17, tires Start 18, End of character 19, Symbol CODE 20.

The driver 7 of the control signals is controlled by signals from the first, second and fourth outputs of the distributor 2 micro-tacts, and on the ninth, last micro-tact (the first micro-tact of the third cycle) the signal from the output of the distributor 2 micro-cycles with the help of the element Ban 9 is not transmitted to the input of the former. signals in order | obtain the necessary function shown in FIG. 3 (6). The whole polygram (Fig. 2) is formed in ten micro-tacts (for two full cycles of the distributor, 2 micro-tacts and one micro-tact of the third cycle).

Triggers 3 and 4 operate in counting mode, trigger input 3 is connected to the fourth output of the distributor 2 micro-cycles, and trigger input 4 is connected to the single output of the trigger. 3, single trigger trigger output 4 connect

At the end of the second cycle of the 2 micro-clock distributor, a single output of the trigger 4 produces a signal that, when applied to the Bar 9 element, prohibits the passage of the signal from the first micro-clock distributor output (on the third cycle).

The AND-HI element 14 serves to determine the contents of the first three bits of the register 5, if it turns out that the contents of these bits are zero, then the signal from the output of the AND-HEY element 14 will go to the AND 10 element.

Element I 10 serves to generate a signal for setting trigger 11 into a single state and forcing the microdactu distributor 2 to a state in which the signal appears immediately at the fourth outlet of the microdactor 2 mintots first three (this applies only to the first distribution cycle of 2 micro-tacts).

The trigger 11 is designed to control the element 15 and the element of the ban 16, through which the light signal enters the element OR 17, the output of which is connected to the backlight bus Z.

Element 12 with the element OR 13 allows to determine the moment of the termination of the formation of the polygram after the selection of the last segment included in the generator of the visual alphabet symbol being displayed.

The device works as follows.

After entering the character code into register 5 on bus 20, the AND-NOT element 14 determines the contents of the first three bits of the register 5, if at least one of them is different from the zero signal at the output of the AND-14 element. The Start 18 bus triggers a pulse generator 1, which produces a periodic pulse train with a period at. This sequence of pulses goes to the distributor 2 micro-tacts, controls the formers 6 and 7 of the deflection functions. Moreover, at the positive input of the former 7, signals from the distributor 2 micro-tacts flow through the element OR 8, and from the first output also through the element Ban 9. The outputs of the formers b and 7 are connected to the X and Y coordinate deviation buses, respectively. The signals from the fourth output of the distributor 2 micro-tacts, in addition, are fed to the counting input of trigger 3. After the second cycle of operation of the distributor 2 micro-tacts has passed, a signal appears at the single output of trigger 4. Being attached to the prohibiting input of the element Ban 9, prohibits the passage of the signal from the first output of the distributor 2 micro-cycles to the driver 7. As a result, the outputs of the drivers B and 7 form the excitation functions shown in Figs. 3 (a) and Figs. 3 (6) respectively. Synchronously with the formation of each element of the polygram, under the influence of pulses from the output of the pulse generator 1, the contents of register 5 are shifted. From the first output of register 5 through the element Ban 16 (there is no signal at the inhibiting input) and through the element OR

The first register output 5 is connected to the backlight bus Z.

Thus, the required elements of the polygram are highlighted.

When all the elements to be displayed are highlighted on the polygrams (the contents of register 5 will be zero), the output of the NAND 14 circuit will generate a signal that will be applied to the input of the NAND 12 circuit through the OR OR NOT 13 element. AND-NOT coincide and at its output, connected to the bus End of Symbol 19, the end signal of the formation of the symbol is indicated. With this signal, the initial settings of the device are made and the writing of the code of the new character into register 5 is permitted (these connections are not shown in the diagram). one

If, after writing the character code to register 5, the contents of the first three bits turn out to be zero (for example, when the number shows seven letters P, etc.), then the output of the AND-14 element will contain a signal that goes to the input of the element. And 10. Two other inputs of this element receive signals from the zero outputs of the flip-flops 3. and 4, which are in zero states. Bus Start

18 a pulse generator 1 is started. The first pulse from the output of the generator 1 is fed to the input element And 10. At the other three inputs of this element, signals already exist. The signal from the output of the element I 10 sets the distributor of 2 micro-tacts to such a state that the signal is in accordance with the memory of the microprocessor on the fourth output of the distributor 2 micro-tact, the first, second and third outputs. The same signal translates trigger 11 into one state. The signal from the single output of the trigger 11 is fed to the prohibiting input of the element 16, prohibiting the passage of signals from the output of the first register 5 to the element OR 17 connected to the backlight bus Z. This same signal goes to the input of the element 15, thus allowing.

the passage of signals from the fourth output of the register 5 to the element OR 17, connected to the illumination bus Z. Next, the device functions as in the first case. When all elements of polygram subject to 5 mapping will be highlighted (the contents of the fourth, fifth, sixth, seventh, eighth and ninth bits of register 5 ipaBHo zero) from the unit output

0 trigger 11 through the element OR-HE13 signal is fed to the input of the element AND-NOT 12. The signals at the input of the element AND-NOT 12 coincide with the output of this. the item on the bus End of the symbol

5 19 the signal comes to the end of the forger, polygrams.

Thus, the speed is significantly increased in comparison with the known devices that form a polygram approximately equal in. difficulties.

Claims (2)

1. Govorov B.C., Sitov V.F. Character generator - Instruments and Experimental Technique, 1971, No. 5. 2. USSR author's certificate 46P25, cl. G 06 K 15/20, 1975 (prototype). phage o3 f {/ g: 2