JPS6125155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for generating a plurality of basic pulse trains of a unit period.
The present invention relates to a method of driving a self-shifting gas discharge panel that supplies electricity to each bus bar by switching sequentially every unit period.

AC discharge self-shifting gas discharge panel is
A discharge spot generated according to input information is shifted to an adjacent discharge point using a pulse voltage with a relatively wide pulse width, and a pulse voltage with a relatively narrow pulse width is applied to the discharge point after shifting the discharge spot. It is applied to erase wall charges. Therefore,
At least two types of pulse voltages are required, and it is necessary to distribute and supply the pulse train for each phase.

Conventionally, such pulse voltages were generated by preparing gate signals corresponding to each pulse voltage for each phase and performing gate control using the gate signals. Therefore, when the number of phases is large, or when the number of pulses per unit cycle and the types of pulses are large, it becomes difficult to supply pulse voltage while maintaining the desired phase relationship between each phase, and the configuration of the drive circuit becomes difficult. It also had the disadvantage of being complicated.
In particular, a self-shifting gas discharge panel with an electrode structure that has no crossover portion has been proposed, for example, in Japanese Patent Application No. 51-82410. The circuit configuration becomes more complex because the periodic pulse train must be distributed in a rotating relationship with respect to each phase.

Therefore, a circuit is provided that repeatedly generates at least two types of pulse trains on conductor lines corresponding to at least the number of phases in each predetermined unit period,
We have previously proposed a driving method in which a pulse train generated on each conductor line every unit period is distributed and supplied to each phase in a sequentially regular rotating relationship. This is Tokugansho
It is the invention of No. 51-144142 (see Japanese Patent Publication No. 58-32713), and its embodiments are briefly described below.
-ME shown in the cross-sectional view of the main part in Figure 2 along line B
When applied to a (Meader Electrode) type self-shifting gas discharge panel, a driving waveform shown in FIG. 3 is applied. In each figure, 1 and 2 are substrates such as glass, 3 and 4 are dielectric layers such as low melting point glass, and 5
is a gas (Ne) that is a mixture of neon and a small amount of xenon.
+Xe) discharge gas filled space, X1,
2, Y1, Y2 are bus lines, x11, x12,...x2
1, x22,...y11, y12,...y21, y2
2,... are electrodes, W1, W2 are write electrodes, SC1,
SC2 is shift channel, w1, ai, bi, ci, di
(i=1,2,3,...) is the discharge point, VW is the pulse voltage waveform applied to the write electrode, VY1, VX1,
VY2, VX2 are pulse voltage waveforms applied to bus lines Y1, X2, Y2, X2, A, B, C, D are (X1-Y1), (X1-Y2), (X2-Y
2), a pulse voltage waveform applied to the discharge point between the electrodes connected to the bus bar of the combination (X2-Y1),
_T1 to _T4 are unit periods, WP is a write pulse, SP is a shift pulse, EP is an erase pulse, and OP is an overlap pulse.

In unit periods T ₁ to _{T 4} in FIG. 3, pulse trains indicated by ˜ are distributed to each phase so as to rotate sequentially. As a result, for example, if the write pulse WP in the unit period _T4 is applied to the write electrode W1, the discharge spot generated at the discharge point _w1 will be applied to the electrode x11, Shift to the discharge point a1 between y11,
In the next unit period _T2 , shift to the discharge point b1 between the electrodes x11 and y21, and in the same manner, shift channel of the array of discharge points c1, d1, a2,...
The discharge spot is shifted along SC1.

FIG. 4 shows a circuit for generating the pulse train shown in FIG. 3, and is composed of a counter circuit unit 10, a basic pulse train generating circuit unit 20, a rotation circuit 30, and a control circuit unit 40. The counter circuit unit 10 consists of a clock pulse generator (CL) 11 and 4-bit counters (4-bit CNT(1), (2)) 12, 13, and the upper three bits t1 to t3 of the 4-bit counter 12
is added to the decoder (DEC) 21 of the basic pulse train generation circuit unit 20, and the lower one bit t4 is
It serves as an input to the bit counter 13 and is also added to the basic pulse train generation circuit unit 20.

The basic pulse train generating circuit unit 20 is composed of a decoder 21, OR gates 22, 29, one shot multivibrators (O/S) 23-25, an inverter 26, and AND gates 27, 28. 1(9), 2(10) of this decoder 21 output,
5(13) and 6(14) are added to the OR gate 22, and represent outputs corresponding to 16 count outputs of the upper three bits t1 to t3 of the 4-bit counter 12, respectively. One shot multivibrator 23, 25 outputs the pulse width of erase pulse EP, one shot multivibrator 24
generates an output with the pulse width of the overlap pulse OP. Therefore, the basic pulse train generating circuit unit 20 generates the pulse train .about. in the unit period shown in FIG.

The rotation circuit 30 includes an AND gate 31
1-314, 321-324, 331-334,
341 to 344, OR gates 31 to 34, and a decoder (DEC) 35.
By the output of , the busbar rows .about. are distributed and supplied to the busbars Y1, X1, Y2, and X2 for each unit period.

The control circuit unit 40 is composed of flip-flops (FF) 41, 42, 45, a 3-bit counter (3-bit CNT) 43, a NAND gate 44, an AND gate 46, a one-shot multivibrator (O/S) 47, and an inverter.
Second bit output t22 of bit counter 13
Outputs A and B of each stage of flip-flops 41 and 42 having a two-stage shift register structure operated by the above are applied to a decoder 35 of a rotation circuit 30. Therefore, from the output of the decoder 35, a rotation signal that switches every 16th count of the basic clock is applied to the AND gate group.

The 3-bit counter 43 is used to control character writing in a 5 x 7 dot pattern, and is used in the ME type self-shift gas discharge panel shown in Figures 1 and 2. , the discharge spots are shifted by forming a set of every 4th discharge point, so 4 unit periods are 1 rotation, and by performing 5 rotations for 7 shift channels, one character can be rotated. is written. In that case, if you leave two lines of space between the characters, 8
The second rotation is the writing timing for the next character.

Therefore, when the 3-bit counter 43 counts 8 and each output becomes "1", the output of the NAND gate 44 becomes "0", the AND gate 46 is closed, and the fourth bit of the 4-bit counter 13 is counted. The output t24 is applied as a clock to the flip-flop 45, and the strobe signal STB becomes "1", thereby resetting the flip-flop 45.
The one-shot multivibrator 47 is triggered by the reset output, and the 3-bit counter 43 is reset by the output, returning to the initial state.

It is an object of the present invention to improve the previously proposed driving method as described above and to provide a method that can be driven with a simpler configuration. Examples will be described in detail below.

FIG. 5 is a block diagram of an embodiment of the present invention;
The same reference numerals as in FIG. 4 indicate the same parts. In this embodiment, a basic pulse train generation circuit unit 20 and a rotation circuit 30 are constructed by a ROM (read only memory) 52. The counter circuit unit 10 has a clock generator 101 and an 8-bit counter 102, and a control circuit unit 40.
is a flip-flop 401, an AND gate 40
The circuit unit 50 has an address decoder 51 and a ROM 52. The ROM 52 is, for example, 4×
Each 256-bit string is divided into 64-bit unit row storage areas corresponding to the four bus lines (Y1, X1, Y2, X2).
The memory contents are as shown in Figure 6.
In the unit row storage area at addresses 0 to 63, the minimum unit cycle is
Four basic pulse trains ~ with T ₀ are stored, and in the three unit row storage areas following this minimum unit period T ₀ , four basic pulse trains ~ with minimum unit periods T ₁ ~ _{T 3} are stored in the previous unit row storage area. The contents are stored in a format in which the order is sequentially changed.

If the strobe signal STB is "0", the flip-flop 401 is in the set state, and all the outputs of the 8-bit counter 102 are sent to the address decoder 5.
1, the contents of addresses 0 to 255 of the ROM 52 shown in FIG. 6 are sequentially read out in parallel and added to the bus lines Y1, X1, Y2, and X2. As a result, the above-described shifting operation of the discharge spots in the gas discharge panel is executed.

Also, when the strobe signal STB becomes “1”, 8
When the most significant bit output of the bit counter 102 becomes "1", the flip-flop 401 is reset, so the AND gates 402, 40
3 is closed, and only the 6-bit output of the 8-bit counter 102 is applied to the address decoder 51. Therefore, the contents of addresses 0 to 64 of the ROM 52 are repeatedly read out, and the unit period T ₀ is repeated.
As a result, a stationary operation of the discharge spot is carried out.

FIG. 7 is an explanatory diagram of the pulse waveform of the unit period T ₀ to _{T 3} when reading the contents of addresses 0 to 255 of the ROM 52, and VY1, YX1, VY2, and YX2 are ROM
Bus lines Y1, X1, Y2, X2 by reading 52
VA, VB, VC, VD are the pulse voltage waveforms applied to the discharge point between the electrodes of the busbar combination in parentheses, VXW is the pulse voltage waveform applied to the write electrodes, VW is the write The pulse voltage waveform applied to the discharge point is shown, and the erase pulse EP is shown in the case where it is generated using a timing difference between the pulses.

By repeating the unit period T ₀ to T ₃ , the unit period
At T ₀ , a shift operation of the discharge spot generated by the write applied pulse voltage is performed, and the unit period
If only T ₀ is repeated, a discharge spot is generated at a discharge point at an already shifted position, and a static display is performed.

In the above embodiment, the method for driving an ME type self-shifting gas discharge panel is mainly explained, but it can be applied not only to driving a matrix type self-shifting panel but also to a DC discharge type self-shifting discharge panel. can also be applied.

As described above, the present invention includes a plurality of basic pulse trains necessary for driving a self-shifting gas discharge panel, and further provides a plurality of basic pulse trains in a predetermined arrangement order so as to selectively execute a shifting operation and a static operation. By storing a series of basic pulse trains in memory,
Since reading of the memory is controlled in accordance with the operation mode, there is an advantage that the drive configuration of the self-shift type gas discharge panel is simple and the control thereof is also simple. Furthermore, there is an advantage that the drive pulse train pattern can be easily changed by changing the contents stored in the memory.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the electrode arrangement of the previously proposed ME type self-shift gas discharge panel, Figure 2 is a cross-sectional view taken along line B-B in Figure 1, and Figure 3 is an explanation of its driving waveform. 4 is a circuit diagram to which the previously proposed driving method is applied, FIG. 5 is a block diagram of an embodiment of the present invention, and FIG. 6 is an explanatory diagram of the contents stored in the memory.
FIG. 7 is an explanatory diagram of pulse waveforms corresponding to the contents stored in the memory. 10 is a counter circuit unit, 20 is a basic pulse train generation circuit unit, 30 is a rotation circuit, 40 is a control circuit unit, 201 and 51 are address decoders, and 202 and 52 are ROMs.

Claims (1)

[Claims] 1 The electrodes that define the arrangement of the discharge elements are connected to three or more busbars in a regular manner in order and three or more busbars correspond to the number of busbars.
A self-shifting gas discharge panel configured with three or more discharge element groups is provided, and a plurality of basic panel rows corresponding to the number of groups are repeatedly generated every predetermined unit period, and these panel rows are In a method for driving a self-shifting gas discharge panel, a number of storage column areas corresponding to the number of busbars are provided, in which a number of storage column areas corresponding to the number of busbars are distributed and supplied to the discharge elements in each group by sequentially and regularly rotating the discharge elements corresponding to the busbars associated with the respective groups. partitioning each storage column area of the memory into a number of unit row storage areas corresponding to the number of busbars, and storing each of the plurality of basic pulse trains for one unit period in each first unit row storage area; At the same time, the plurality of basic pulse trains are stored in series in each successive unit row storage area according to a preset rotation order, and when the discharge spot is shifted,
The entire contents of each storage column area of the memory are repeatedly and sequentially read out in parallel, and when the discharge spot is in a stationary operation, the contents of one unit row storage area of each storage column area of the memory are repeatedly read out in parallel and sequentially, A method for driving a self-shifting gas discharge panel, the method comprising driving a self-shifting gas discharge panel.