SU1247920A1 - Device for displaying information on screen of gaseous-discharge display panel - Google Patents

Abstract

The invention relates to the field of automation and computer technology, namely, devices for displaying information. The purpose of the invention is to improve the accuracy of the device, which is achieved by introducing the third and fourth pulse shapers and the third, fourth, fifth and sixth AND elements and functional connections. The device operates in the following modes: normal, decreasing and increasing the scanning frequency. There may be a sweep disturbance mode caused by the failure of one of the scanner elements (short circuit or stop). In normal operation of the device, logical summation from the outputs of the first, second, fifth, and sixth elements of I gives a constant level controlling the operation of the key (its closure). When the sweep frequency is reduced, the third and fourth pulse formers do not start, the voltage at the output of the OR element will be zero at the moments when there are no pulses from the outputs of the first and second pulse formers and the switch closes only for the duration of the trans. By increasing the sweep frequency, the pulse from the output of the third or fourth pulse shaper fills the gap between the pulses from the outputs of the first and second pulse shapers, and the output of the OR element will have a high voltage level and the key will be closed. When the sweep breaks, the voltage at the output of the OR element is zero, the key is open and the voltage is not applied to the key block. This makes it possible to increase the accuracy of the device by eliminating the possibility of a false key (protection) actuation. 3 il. (LU N CO 10

Description

The invention relates to automation and computing, namely, information display systems, and can be used in the construction of display devices to protect the indicator from current overloads in violation of the mode of operation.

The purpose of the invention is to improve the accuracy of the device.

FIG. 1 shows a block diagram of the device; in fig. 2 and 3 are the stress plots showing his work.

The device contains a gas discharge indicator panel 1, a sweep block 2, the first 3 and second 4 voltage dividers, a key block 5, a key 6, a synchronizer 7, threshold blocks 8 and 9, a differentiation block 10 and 1, the first and second drivers 12 and 13 pulses, integrators 14 and 15, the first and E second elements AND 16 and 17, the element OR 18, the third and fourth elements And 19 and 20, the third and fourth formers 21 and 22 pulses, the fifth and sixth elements And 23 and 24. Device works as follows. The horizontal buses of the gas-discharge indicator panel 1 are alternately supplied with voltage pulses of duration Huck from the outputs of scanner unit 2, which leads to alternate changes in potentials at points 25 and 26 of voltage dividers 3 and 4 (Fig. 2 a, b). The vertical buses of the gas-discharge indicator panel 1 are supplied with a control voltage in accordance with the information inputs of the key block 5, the supply voltage (+ 11) to which is supplied through the key 6. The synchronous switching of the horizontal and vertical buses is carried out by the synchronizer 7 connected to block 5 keys and block 2 sweep. The voltage pulses from the outputs of the dividers 3 and 4 voltage arrive at the inputs of the threshold blocks 8 and 9, the threshold voltage of which (Stop, Fig. 2 a) is chosen so that when one of the horizontal buses of the gas discharge panel 1 is connected, the potential at the point A 25 or 26 divider of 3 or 4 voltages was below the value of the Stop. Therefore, when simultaneously connecting two or more horizontal buses of the gas discharge display panel 1, the output of at least one of the blocks 8 or 9 will be zero. The pulses from the outputs of blocks 8 and 9 are differentiated by blocks 10 and 11 (Fig. 2c, d) and start the formers 2 and 13 pulses, the duration of the pulses at the outputs of which is equal to the specified duration of current for this type of gas discharge display panel (fig. 2 d, e).

The modes of operation of the device can be as follows: normal (Fig. 2, I), reducing the frequency of the sweep (Fig. 2, I), increase

0

five

0 17

five

0

five

the scan frequency (Fig. 3, III). These modes are described by inequalities respectively.

 (one);

Gsk Tygip (2)

Gsk -1: hyp (3)

A sweep disturbance mode may also occur (Fig. 3. IV), caused by the failure of one of the key elements of sweep unit 2 (short circuit or stop sweep).

In normal operation, i.e., when inequality (1) is fulfilled, the pulses from the outputs of the formers 12 and 13 will partially overlap each other, which leads to the triggering of elements 19 and 20 I, since their inputs are connected to the outputs of the formers 12 and 13 of the pulses and Blocks 11 and 10, respectively. The pulses from the outputs of the elements 19 and 20 And (Fig. 2 and, K) start the shapers 21 and 22 pulses, the duration of the pulses at the outputs of which are also equal to the specified duration of the current tigp. The integrators 14 and 15 smooth out the pulse sequences from the outputs of the formers 12 and 13 to a level sufficient to trigger (UF) the elements AND 16, 17, 23 and 24 (Fig. 2 g, h), therefore the pulses from the outputs of the formers 12, 13, 21 and 22 passes through elements 16, 17, 23, and 24 AND, and is fed to element 18 OR. The logical summation of the sequences from the outputs of the SFs 16, 7, 23, and 24 gives a constant level (Fig. 2n), which controls the operation of the key 6, closes it.

When the scanning frequency decreases, i.e., when inequality (2) is fulfilled, the pulses from the outputs of the formers 12 and 13 will be shifted in time (1 relative to the other, therefore, elements 19 and 20 will be closed during the appearance of pulses at the outputs of blocks 11 and K) differentiation, respectively (Fig. 2 and, K), shapers 2 and 22 of the pulses do not start up (Fig. 2 l, m), the voltage at the output of the element 18 OR will be zero in time without pulses the outputs of the formers 12 and 13 (Fig. 2n), and the switch 6 is closed only for the duration of the switching time.

When you increase the scanning frequency, for example, when

Tech

; 2 "

,

where n is an integer, the first pulses from the outputs of the differentiation units 10 and 11 start the formers 12 and 13. The pulse duration at the outputs of which blocks two or more triggering pulses, which leads to the appearance of gaps between the pulses from the outputs of the formers 12 and 13. When this at the output of one of the elements 19 and 20 and according to

“The first closing pulse (Fig. 3k), and at the output of another element And 20 or 19, the second triggering pulse (Fig. 3), from which one of the formers 21 or 22 pulses (Fig. 3 l) is triggered. The pulse from the output of this driver fills the gap between the pulses from the outputs of the drivers 12 and 13, therefore the output of element 18 OR will be a high voltage level (Fig. 3n) and key 6 will be closed.

If the sweep breaks, the voltage at points 25 or 26 of divider 3 or 4 will be less than the stop (Fig. 3a), and the voltage at the output of one of the blocks 8 or 9 is zero, as a result of which there are no pulses at the output of the driver 12 or 13 (Fig. 3 e). The integrator 14 or 15 associated with this driver closes AND elements 16 and 23 or 17 and 24 (Fig. 3 h). At the same time, the other of these elements And are also closed, since they are associated with the outputs of the formers, on the outputs of which there are no pulses (Fig. 3 e, l). Since the elements AND 16, 17, 23 and 24 are closed, the voltage at the output of the element OR 18 is zero, (Fig. 3n), the key 6 is open and the voltage on the key block 5 is not applied.

Claims (1)

Invention Formula A device for displaying information on a gas-discharge display panel screen containing a scanner, the input of which is connected to the first output of the synchronizer, and the outputs are connected to one of the coordinate sections of the gas-discharge display panel, the other coordinate buses of which are connected to the outputs of the key block, the first input which is connected to the second output of the synchronizer, the second input to the output of the key, the inputs of the key block group are the information inputs of the device, the first input of the key is connected to the power bus connected to one of the inputs of the first and second voltage dividers, the other inputs of which are connected to the corresponding outputs of the scanner, a chain of series-connected first threshold block, first differentiating unit, first pulse former, first integrator and first And element and a chain of the second threshold unit, the second differentiating unit, the second pulse generator, the second integrator and the second element And, the outputs of the first and second elements AND are connected to the first and second inputs of the OR element, the output of which is connected to the second input of the key, the inputs of the first and the second threshold units are connected to the outputs of the corresponding voltage dividers, characterized in that, in order to improve the accuracy of the device, it contains the third and fourth pulse shapers and the third, fourth, and fifth and sixth AND gates, the inputs of the third AND gate connected respectively with the output of the first pulse shaper output and a second 5 of the differentiating unit, and the output - to the input of the third pulse generator, the output of which is connected to the first input of the fifth element AND, the second input of which is connected to the output of the first integrator, the output of the fifth element AND connected to the third input of the OR element, the inputs of the fourth element AND connected, respectively, to the outputs of the second pulse driver and the first differentiating unit, and the output - to the input of the fourth pulse driver, the output of which is connected to the first input of the sixth element And, the second input of which is connected nen with output of the second integrator and the output of the sixth AND gate connected to the fourth input of the OR element. ffije-i irnnrni . Lritlrlnrul . .. I- f