SU1675933A1 - Method of controlling the gas-discharged display panel and device thereof - Google Patents

Abstract

The invention relates to automation and computer technology and is intended to display information on gas discharge display panels of alternating current (HIP). The purpose of the invention is to improve the reliability of the method and device is achieved in the method due to the short duration of the pulses maintaining the discharge, obtaining calibrated for the duration of the erase pulses on different HIP electrodes and selecting a certain ratio of the duration of the resulting pulses applied to the selected HIP cells, and in the device by introducing the voltage divider, the third and fourth keys, the current limiter, the AND elements, the OR element, the decoder of the third group of keys and the corresponding function in order to eliminate false ignition and premature blanking of the ISU cells. 2 sec. n. f-ly, 3 ill.

Description

The invention relates to computing and is intended to display information on gas discharge display panels of alternating current (HIP).

The purpose of the invention is to increase the reliability of the method and device.

FIG. 1 shows timing diagrams explaining the method; in fig. 2 is a block diagram of the device; in fig. 3 is a diagram of the operation of the device.

FIG. 1 shows a unipolar impulse 1 supporting the discharge along the X coordinate during imaging, a unipolar impulse 2 maintaining the discharge along the Y coordinate during imaging, the resulting impulses 3 upon imaging, unipolar impulses 4 maintaining the discharge along the X coordinate during recording, an additional impulse to maintain the discharge for the selected electrodes along the X coordinate during recording, impulse 6 to record for the selected electrodes along the X coordinate during recording, the first 7 and second 8 impulses to maintain the discharge for the selected electrodes along the Y coordinate at i, unipolar impulse 9 maintain discharge for unselected electrodes on Y coordinate when writing, resultant pulses 10 and 11 when writing, unipolar impulses 12 maintain discharge on X coordinate when erasing, erase pulse 13 for selected electrodes on X coordinate when erasing , the first 14 and second 15 erase pulses for the selected electrodes along the X coordinate in the second erase cycle, the first 16 and second 17 discharge maintain pulses for the selected electrodes along the Y coordinate during erasure, the unipolar discharge support pulse 18 but for

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with

unselected electrodes on the Y coordinate when erasing, the resulting pulses 19 when erasing.

The control process is carried out by varying the duration of the pulses maintaining the discharge. In the display mode, the duration of the pulses 1 and 2 of the voltage maintenance voltage is set equal to the maximum allowable value. The longer duration of the supporting pulses ensures the formation of the wall voltage required for the stable operation of the HIP, allows it to operate at a minimum magnitude of the discharge voltage, and eliminates the possibility of the emergence of through-currents of charging switches that impair the energy performance of the device.

In the recording mode on all electrodes, the X coordinates form an additional impulse 5 supporting the discharge and a recording impulse 6.

On the selected electrodes, the Y coordinates form the first 7 and second 8 pulses maintaining a discharge of nominal amplitude and duration. The cut of the pulse 7 is combined with the front of the pulse 6 of the recording, the front of the pulse 8 - with the cut of the pulse of the recording. On unselected electrodes, the Y coordinates form a unipolar discharge-sustaining pulse 9.

A distinctive feature of the pulses formed by diode-transistor sampling blocks used in modern devices for displaying information on the GUI is a relatively long duration of their fronts, reaching 2.5-3.5 μs with a large (up to 50%) spread of this parameter. This complicates the process of forming identical recording pulses on different GUI electrodes, leading to a decrease in the reliability of accessing the given panel cells.

The method makes it possible to increase the reliability of the recording process by obtaining identical, calibrated for the duration of the recording pulses. This is achieved by forming on the selected electrodes the X coordinate of an additional pulse 5, the unstable front of which is shifted relative to the front of the pulse 7 supporting the discharge of the Y coordinate by a time longer than the maximum duration of the front of the pulse 5. From the UXB-UYB time diagram (FIG. 1) on the selected GUI cell in the recording mode, it can be seen that the instability of the front of the resulting pulse does not affect the parameters of the recording pulse (the possible variation in the duration of the front is shaded).

In the erase mode on all electrodes, the X coordinates form a pulse sustaining pulse 12 with a duration equal to the minimum allowable value. On the selected electrodes, the X coordinates in the first erase cycle form an erase pulse 13, and in the second - the first 14 and second 15 erase pulses. On selected electrodes, Y coordinates

0, the first 16 and second 17 pulses for maintaining the discharge form, and for the unselected ones - impulse 18.

Like pulses generated on selected electrodes in recording mode,

5 erase pulses have a longer fronts duration. At the same time, the requirements for stability of the parameters of erase pulses are more stringent, since their duration is less than the duration of the recording pulses.

0 The method allows to increase the reliability of the erase process due to three factors: a small pulse duration 12 to maintain the discharge, to obtain identical, calibrated for the duration of erase pulses on different electrodes

GUI, select a specific ratio

the duration of the resulting pulses

attached to selected GUI cells.

The first factor limits the size of the accumulated wall charge on the selected GUI electrodes at the time point preceding the erasing impulse, facilitating this erasure process. The second factor is ensured by shifting the fronts of the pulses 13 and 14 relative to the front of the pulse 16, which determines the cuts of the resulting erase pulses applied to the selected HIP cells.

0 In this case, the scatter of the parameters of the erase pulses 13 and 14 generated on the selected electrodes of the X coordinate affects only the duration of the resulting impulse of maintaining the discharge along the Y coordinate, but does not affect the erasing process (provided that the duration of the resulting impulse is longer than the minimum permissible value, which is always feasible). The peculiarity of modern GUI control is that, due to technological variations in cell parameters and sample blocks connected to a GUI, the dynamic range is erased (the allowable range of amplitude and time parameters for erasing pulses at which reliable, controllable control of all GUI cells is maintained) very narrow. Formation in one step of two erasing pulses of different durations with a ratio of durations of 4: 1-3: 1

a number of (discharge) equivalent capacitance (Seq) and discharge current of burning cells. The large value of these currents at a finite value of the resistance of the keys and inductance of the supply conductors leads to characteristic distortions of the shape of the output pulses: a dip at their tip. The presence of a dip is equivalent to a decrease in the voltage applied to the cells at the time of the flow of the main internal process of the ISU — gas gap breakdown and flow of cell discharge currents. In modern panels with a large number of electrodes, the total discharge current of the cells reaches several tens of amperes. With a large value of equivalent capacitance, the value of the front of the support pulse reaches 0.5-0.8 µs, and the magnitude of the dip is 10-20% of the amplitude value of the pulses, which is unacceptable. These distortions reduce the controllability range of the GUI, which can lead to a distortion of the displayed information, spontaneous damping (or ignition) of the GUI cells.

In the device, due to the use of several, for example k, charge (correction) switches, the magnitude of the current flowing through one key and, accordingly, the magnitude of the distortion of the edges of the pulses maintaining the discharge are reduced by a factor of. Thus, to increase the reliability and, accordingly, the speed of the gas discharge panel control process, the following factors are used: the formation of four erase pulses of different duration in two control cycles using the fourth key 32, elements AND 34 and OR 35, the choice of optimal values of duration and time position pulse maintaining pulses and control pulses in each of the three modes of operation, for example, generating a two-level control pulse of the X coordinate in recording mode using a fourth recording key 32, calibrating the duration of all generated control pulses, improving the shape, reducing pulse front distortion by n times by using n-bit (correction) keys, increasing the noise immunity and electromagnetic compatibility of the analog and digital control units, due to a decrease in to the times of the pulse currents for the formation of control pulses due to the use of the decoder 36 and the third group of keys 37.

Claims (2)

These factors provide a controlled process of controlling all the cells of the gas discharge panel with large variations in the parameters of the sampling blocks, the effect of destabilizing factors, and the use of panels of any size. Claims 1. A method for controlling a gas discharge indicator panel, comprising 0 generating unipolar pulses maintaining the discharge along the X and Y coordinates for all electrodes and generating recording pulses and erasing the nominal amplitude along the X coordinate for selected 5 electrodes for recording and erasing, respectively, characterized in that, in order to increase the reliability of the method, the discharge maintaining pulses during imaging are formed with a duration equal to 0 maximum permissible nominal value, and when recording and erasing along the X coordinate for all electrodes, the minimum permissible nominal value when recording for selected 5 electrodes along the X coordinate form an additional impulse to maintain the discharge with a duration two times longer than the duration of the first impulse maintaining the discharge and with a delay relative to its trailing edge by 0.05-0.07 T, where T is the display cycle duration and pulse records form a nominal duration on the falling edge of the additional pulse 5 bits, when recording for the selected electrodes, two pulses of maintaining the discharge of nominal duration are consistently formed along the Y coordinate, the trailing edge of the first pulse supporting pulse coincides with the leading edge, and the leading edge of the second — with the falling edge of the recording pulse, respectively, and for unselected electrodes along the Y coordinate, a unipolar discharge maintain pulse is formed at the moment of forcing the leading edge of the first discharge maintain pulse for the chosen electrodes along the coordinate Y, spine defined by a falling edge 0 of the second pulse maintaining pulse for the selected electrodes along the Y coordinate, in the first cycle of erasing mode for the selected electrodes along the Y coordinate two successive discharge pulses are formed, the first of which is equal to the duration of the additional pulse for the selected electrodes along the X coordinate during recording, and the duration of the second is equal to the minimum acceptable nominal value, with In this case, the leading edge of the second pulse is delayed relative to the leading edge of the first for a time maximum allowable discharge time of the wall voltage, and for the unselected electrodes along the Y coordinate, the single-pole discharge support pulse is forced by the duration from the leading edge of the first discharge pulse for the selected electrodes to the rear the front of the second pulse, for the selected electrodes along the X coordinate in the first cycle of the erase mode, the erase pulse is formed with a delay relative to the leading edge The first impulse of maintaining the discharge along the Y coordinate for the time of the maximum permissible value of the nominal erase impulse duration, the duration determined by the falling edge of the second impulse for maintaining the discharge along the Y coordinate delayed relative to the trailing edge of the erasing pulse by the time equal to the minimum value of the discharge time of the wall In the second cycle of the erase mode for the selected electrodes, two erase pulses of nominal amplitude are successively formed at the X coordinate; The first of which is formed with a delay relative to the leading edge of the first pulse maintaining the discharge along the Y coordinate for the selected electrodes by the time of the minimum allowable value of the nominal erase pulse duration, and the trailing edge is delayed by the falling edge of the first pulse by the time of the nominal value of the discharge wall voltage the leading edge of the second pulse is formed with a delay relative to the leading edge of the second pulse of maintaining the discharge along the Y coordinate for selected electrons. for the time of the double value of the nominal discharge time of the wall voltage, and the rear front at the time of the formation of the rear front of the second pulse. 2. A device for controlling a gas-discharge indexing panel according to claim 1, comprising tire sampling units according to X and Y coordinates, respectively, whose outputs are connected to horizontal and vertical tires of the gas-discharge indicator panel, respectively, and the control inputs are connected to the corresponding outputs of the first group of unit control, the first and second outputs of which are connected to the control inputs of the first and second keys, respectively, the information inputs of the first and second keys are connected to the information inputs of the keys of the first and second groups and the first output of the voltage converter, the outputs of the keys of the first and second groups are connected to the first information inputs of the corresponding tire sampling units in the X and Y coordinates, and the control inputs to the third and the fourth output of the control unit, respectively, which is so that, in order to increase the reliability of the device, it contains a voltage divider whose input is connected to the second output of the converter the third and fourth keys, the information inputs of which are connected to the second output of the voltage converter and the output of the voltage divider, respectively, and the control input of the third key is connected to the fifth output of the control unit, the current limiter, the input of which is connected to the outputs of the first, third and the fourth key, the elements And, the inputs of which are connected to the corresponding outputs of the second group of the control unit, the OR element, whose inputs are connected to the outputs of the AND elements, and the output to the control input of the fourth key, the decoder, the inputs of which are connected to the corresponding outputs of the third group the control unit and the third group of keys, the control inputs of which are connected to the corresponding outputs of the decoder, the information inputs are connected to the output of the current limiter, and the outputs are connected to the second information inputs of the respective tire sampling units along the X coordinate, while the third information inputs of the tire sampling units along the Y coordinate are connected to the output of the second key. (for example, the duration of the first pulse is equal to the maximum allowable value, and the second one - to the minimum allowable value) compensates for the shortcomings of using single erase pulses and expands the dynamic erase area almost doubled. Thus, the technical efficiency of the third factor of the proposed method consists in expanding the zone of dynamic erasure due to the formation of two erasing pulses of different duration within one cycle. An additional advantage. The essence of the method is the large duration of the pulses 18 for maintaining the discharge of 15 non-uncovered electrode electrodes. The passage of a discharge current of a controlled cell partially captures the area of neighboring cells, which can cause the occurrence of a discharge and false erasure. In method 20, the duration of the supporting pulses of unselected electrodes in the Y coordinate increases in erase mode to 8–9 μs. The wall voltage of unselected cells, including neighboring ones, of the 25 cells increases, which prevents their false erasing of the discharges of the selected cell. The weakening of the influence of the controlled cells on the neighboring cells increases their noise immunity, i.e., the reliability of the control process 30 as a whole. The advantage of the control method is higher reliability by optimizing the shape of the supporting and control pulses in all modes of operation of the GUI. In the erase mode, erase pulses are applied to each of the cells, the shape and duration of which vary within one period, and, moreover, from period to period. As a result, the scatter of the parameters of the semiconductor devices of the sampling units and the HIP cells themselves is compensated for, and each of the cells receives an erasing pulse with parameters close to optimal. Practically one control cycle (two for a GUI with 512 x 512 electrodes and more) is sufficient to ensure reliable control of all GUI cells, while in the known control methods it takes 8-16 50 periods. As a result, the control performance of the GUI is significantly increased. The device comprises a tire sampling unit 20 along the X coordinate, a tire sampling unit 21 along the Y coordinate, 55 GUI 22 horizontal tires, GUI 23 vertical tires, control block 24, the first 25 and second 26 keys, the first 27 and second 28 groups of keys, voltage converter 29, voltage divider 30, third 31 and fourth 32 keys, current limiter 33, AND 34 and OR 35 elements, decoder 36 and third key group 37. Block 21 contains transistors 38 and 39, diodes 40 and 41 and resistor 42, The device works as follows. In order to improve the shape of the voltage pulses that maintain the discharge in the device, the principle of a semi-distributed generator is used: the front of the pulses forms a group of correction keys, and the cutoff - sampling units. In the information display mode for a short time, for example, 0.05T, the keys of the first group 27 are turned on and the equivalent capacitance of the HIP cells is charged to the output level of the voltage converter 29. When enabled, the sampling units are equivalent to the capacity of the GUI cells being discharged to zero. When this process is repeated at a frequency of 40 KHz, rectangular voltage pulses for maintaining a discharge with a duration of 0.251 are formed on all electrodes of the HIP coordinate X. Similarly, using the keys of the second group 28 and the corresponding sampling blocks, the pulses of the supporting voltage on the electrodes of the Y coordinate are formed. The amplitude of the impulses to maintain the discharge is chosen insufficient to cause a discharge in the HIP cells, but sufficient to maintain the discharge in the previously fired HIP cells. The timing of the clock pulses used to generate the support pulses is set by the control unit 24. In the erase vi recording modes, using the keys of the first 27 and second 28 groups and sampling blocks 20 and 21 on all electrodes, the X coordinates form shorter 1-bit support pulses. In the recording mode on the selected electrodes, the X coordinates form a pulse sustaining pulse (using keys 25 and 37) and a recording pulse (using keys 31 and 37) sequentially. The decoder 36 and the keys 37 only transmit these voltages to a selected group of electrodes, such as the even electrodes of the upper half of the screen. The selection of electrodes within the group is carried out using appropriate sampling units. For this, the control unit 24 sets all the transistors 39 of the sample blocks, except for the selected blocks, along the X coordinate and along the Y coordinate. As a result, on the selected electrode, the X coordinates and The selected electrodes of the Y coordinate establish a high potential. At the same time, the high potential of the unselected electrodes of the coordinates partially compensates for the increased potential of the selected electrode of the X coordinate, preventing the ignition of the HIP cells located at the intersection of the selected HIP electrode of the X coordinate and the unselected electrodes of the Y coordinate. Thus, the presence of an ignition pulse, i.e., a high potential on the selected electrode of the X coordinate and a zero potential on the selected electrode of the Y coordinate in the same interval, leads to the ignition of only one cell located at the intersection of the selected electrodes. The process of selecting cells in the erase mode is similar to the recording mode. In the erase mode, the control unit 24 puts the keys 32 and 37 into conduction, all transistors 38 (except for the selected) blocks of the sampling coordinate X, and one selected key of the same Y unit. All transistors 39 (except for one selected) of the sample block the coordinate is in the conducting state, and on all the unselected electrodes of this coordinate a high potential is maintained provided by the second key 26 from the converter 29 through the transistors 39 of the sampling units being in the conducting state. Thus, a high potential at the selected electrode at the X coordinate and a zero potential at the selected electrode of the Y coordinate leads to the formation of erasing pulses vt, respectively, to selectively quenching the cell located at the intersection of the selected electrodes at the X and Y coordinates. High potential of the unselected coordinates electrodes Y compensates for the high potential of the selected electrode of the X coordinate, preventing the suppression of the ISU cells located at the intersection of the selected electrode of the X coordinate and the unselected coordinate electrodes. You Y. By making various combinations of the included transistors 38 and 39 of the sample blocks, it is possible to selectively address each of the cells (or a group of cells) of the ISU. Unlike diode-resistor GUI control circuits, where the functions of forming control pulses perform powerful key stages, in the diode-transistor sampling units there are two low-power transistors for each GUI bus. This permits the execution of sampling units in an integral design, but it is difficult to obtain a short duration of the edges of the support and control pulses, which determine the high reliability of the control of the GUI. The base current of the transistor of the sampling unit, which provides a difference from a high output voltage level to a low one, i.e. the formation of a cutoff control pulse, can be chosen large enough, since the base circuit is connected to a low-voltage (usually five-voltage) supply voltage source. With acceptable power consumption with integrated technology, the duration of the cutoff of control pulses can be obtained in the order of 0.3–0.4 µs. The base current of the transistor 39 of the sampling unit is limited by the value of the resistor 42 connected to the high-voltage source. In order to obtain the required pulse-front duration required for reliable GUI control, the value of the resistor 42 (taking into account the actual load capacity) must be selected to be no more than 20 kΩ. In this case, the total power losses on these resistors exclude the possibility of an integral design of the sampling blocks. In order to obtain the values of power dissipated by the keys and resistors of the sampling unit that are acceptable for the integral performance, the magnitude of the latter is chosen in the order of 50 kΩ. The power dissipated by the sampling blocks is reduced to a value acceptable for the integrated technology due to the deterioration of the parameters (increase in the front and delay time) of control pulses. At the same time, the power consumed by the elements of the sampling units is much higher than the useful power consumed directly by the ISU cells. High consumption currents not only degrade the weight and size characteristics of the display device, but also cause a high level of interference arising on the fronts of control pulses. Interference to the control unit and the low-voltage elements of the sampling units is the cause of the uncontrolled ignition or quenching of the ISU cells and the output of the sampling units from the system. The use of the 36 m decoder of the third group of keys 37 eliminates these phenomena, ensuring high reliability of the GUI control. An additional factor adversely affecting the reliability of the control of the GUI, with a large value of charge currents, is a distortion of the flat part of the output pulses of the sampling units. The physical processes occurring in an HIP are associated with the passage of large current pulses. They are formed by currents .1 33 8Ј thirty B37 32 37 20 2lf 27 I20 & U22 Legend: O-AtDecoration, J- entry, C1- levy / th erase cycle, C2- Ztoroy c of it / frame Fig. 3