JPS5818687A - Driving of fluorescent indicator tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a fluorescent display tube in which a bright stripe is generated and a fluorescent display tube is used.
#O fluorescent display tubes are widely used.

FIG. 1II and FIG. 2 are a flat diagram and a Confucian diagram showing an example of the electrode arrangement of a dot matrix type fluorescent display tube. In the figure, mul is a 1-')0 anode row, and each anode is arranged in a 1#1 row consisting of a dot pattern coated with phosphor on a glass plate (not shown). The anode 1 is constructed by wiring pattern 1, and the anode rows are arranged at equal intervals with A1 and t.

01 to G are orthogonal to the anode rows M1 to M1, and the anode rows M1 to M1 are orthogonal to each other. [Gudad with a distance,
It has a mesh-like structure. In addition, guvydo a, ~Q
, and the anode is placed in parallel with the anode arrangement 1 ~ - and the anode is placed between the two! Filaments r凰 to rIII are arranged every few of the anode rows 1 to ^llO.

Fluorescent display tubes with such a structure are
The anode rows closer to 1 are brighter and the anode rows farther away are darker.
Bright and dark stripes parallel to ~rm occur, degrading the display quality. The ζ011K Shosha Simple On-Off@Show also had a drawback that was noticeable in the way it displayed halftones.

Therefore, it is an object of the present invention to provide a method for driving a fluorescent display tube in which bright and dark stripes do not occur on the display surface.

In order to achieve these objects, the present invention provides a method in which the amount of electric power supplied to a fluorescent display tube having a plurality of O anode rows and 4 IsK filaments is expended in accordance with the distance between the filament and the anode. It is. The present invention will be described in detail below using the drawings.

FIG. 2 is a 1IIrfJ diagram of an electrode portion of a fluorescent display tube in which filaments are arranged for five anode rows. In this case, among the anode rows Al to Mu1 glue.

The anode rows closest to the filament are Mu1, Mu.

AI, and the next closest anode row to the filament is MIL.
-Mu4 #MuT #Mu-, Als, Mu14, the anode row furthest from the filament/g is Mu1.

Mubai, Munari, Ml., A11# Mukou District Terl, L,:
.

In this case, even if the distance from each anode row from the filament increases, the brightness of the anodes as a whole can be made uniform by increasing the supply voltage or lengthening the voltage supply time. In other words, if the current is constant, there is no need to change the amount of electricity9.
, in the case of Figure 2, the least amount of power is supplied to the anode arrays M1, M1, M1,
, Mu-, Mu1.

M11. By supplying the largest amount of power to the anode arrays M8, M4*'1mm, M2, and M14, the middle O power amount of the eight types of power shown above will produce bright and dark stripes. It is possible to emit light even when there is no light emitting.

FIG. 3 is a circuit diagram showing one embodiment of the present invention, and FIG.
The same symbols are used for the same parts and corresponding parts as in the figures. In the same figure, 21 to 2t are shift registers, which input the input signal input to the input terminal 8■ in synchronization with the clock signal supplied to the CL terminal, and output 111110t to Gi.
0 of data transfer between each shift register that sends a K affirmative signal! [I continuation is 1 of the previous stage shift register vjto terminal and the next stage shift register! Nine operations are performed by connecting the terminals in an O chain.

Shift register! The output terminals of the AND gates 31-S are connected to the output terminals of the AND gates 31-S, respectively, and the output terminals of the AND gates h-8m are connected to the driver quadruple-4. The anodes are connected to the anode columns M5 to M1 through.

The other input terminal of S, -3,
Items with the same I conditions are shared, and each pulse is generated IBS 1~! ! Connected to 3. Oku driver 4
t~4mO power supply input terminal similarly, power 1[@s~6sK
It is connected.

Note that the pulse generators S1 to S51 generate pulses indicated by jlI4wlK in synchronization with the clock signal. Of these, in Fig. 4, m is the pulse τ corresponding to the pulse generator 51, and l is the pulse generated 1)! Ss and C correspond to pulse generation 1) 5 mK. Also, the power supply 61 ~ outputs the @saM- voltage.

The operation of the method for driving a fluorescent display tube constructed as above and according to the present invention is as follows. ◎First WJKs? Grid Gl , G, , G, ...is G* #G,
, Gs... are turned on one by one by an external circuit (not shown). One grid is always in the
It is in the N state, and a voltage corresponding to the light emitting head pattern y is applied to the anodes 55 to 5 at each position. The t9 grid pattern simply performs scanning, and the anode pattern selects the pattern to be emitted at that time. During grid scanning, a blanking period is usually provided to prevent leakage light emission as shown in FIG. As shown in the fourth diagram, n shift register clock pulses exist only during the blanking period. Shift register 210 Manual power 111♂When data corresponding to luminous butter/ is supplied from an external device (not shown) in the summer, shift register 2t performs τ data transfer during the blanking period.0 After data transfer, each shift Register output end 01
~O. is a stable state], and outputs data corresponding to whether each anode emits light or does not emit light. After that, the blanking period is canceled and the actual light emission time begins.

Here, the signal from the output terminal 01 of the shift register 2 is supplied to one input terminal of the AND gate h, and the other input terminal of the AND gate 31 is generated from the pulse generator im as shown in FIG. 4C. Since the pulse signal is supplied, the AND gate h outputs an output for a predetermined period of time and is supplied to the driver 4.

Since power is constantly supplied from the driver 4tK power supply 61, the anode row 1 is detected only during the period when the signal from the AND gate h is supplied. Since the anotom 1 is located at the farthest point from the filament, l/E4
The emission time of the inner layer of the 3W pulses Em, B, and C is also determined by the pulse CK, which has a larger pulse width.

Similarly, the output terminal 02 of the shift register 2 is connected to an AND gate hK, and this AND gate is connected to a pulse generator sm.
is #1! It is threaded. This is because a voltage is applied via the driver to the fourth tomb, corresponding to the distance 111 from the filament, with an intermediate pulse width compared to the others.

Similarly, the output terminal 0 of the shift register 21 is connected to an AND gate h, and a pulse generator @S1 is connected to this AND gate. This is a pulse generator that outputs the pulse shown in Fig. 4. Since node 3 has the shortest distance from the filament to the 7 nodes, a voltage is applied via the driver with the minimum pulse width.

In this way, driving pulses with a width of 9 pulses are applied to the anodes 1 to 4nK taking into account the distance to the filament, so the brightness is made uniform and the same brightness is Ii! Since the image is visible, light and dark stripes do not occur.

In the above target, as shown in FIG.
By changing the duration of the pulse signal supplied to the anode arrays A1 to A3n. The brightness of -Kl! I'm trying to be noticed. However, the brightness of the emitted light can be changed to t by changing the power 'IIkl- input to the anode arrays 1 to 1, so the voltage supplied from the power supply 61 to Even if the duration of the pulse signal is the same, uniform brightness τ is observed in the anode arrays A, . In addition, Figure 5 is the electrician II 6
The voltage generated from t, MS diagram B is from the power supply 61, the 5th E
C indicates the voltage generated from the electric current WI@s, ll1s indicates the four pulses supplied to the clock input terminal CLK of each shift register, and T indicates the blanking period.

In the example shown in Figure 3, one filament was arranged for every five 7-node rows, but depending on how the filaments are arranged, the quantity of power supplied to the pulse signal generator or driver may vary. The following numbers are required.

1 filament for 3 anode rows... 2 units 1
4 pieces 1 1 piece・-2 pieces I 5 pieces 1 1 piece…3 pieces l 6 pieces
1 1 piece...3-kI 7 piece 1
1 - 4 units I 8 units I 1... 4 units When implementing this method specifically, shift registers 21 to
2t, AND gate Ss,, am@driver 41~
For 4n, it is more convenient to use 2" (+a is a positive integer) elements in one unit. For this reason, for example, an AND gate group or a driver group in which 8 elements are combined into one general When using #!3, filaments are arranged every 5 in 7-node rows as shown in figure 3, and a large fluorescent display tube is used.As shown in the dotted line, the corresponding driver for each filament is 46.
41. Therefore, it is necessary to span two driver groups], which is extremely complicated in terms of implementation.

However, as shown in FIG. 6, in a fluorescent display tube in which a filament is arranged for every four anode rows, one driver group, one AND gate group, and one shift register correspond to two filaments. Therefore, the connections are simply repeated9, and the implementation is simple.0 As explained above, the present invention can reduce the amount of power supplied to the anode rows of a fluorescent display tube having a filament for each of a plurality of anode rows. Since the distance between the filament and the anode is changed according to the distance between the filament and the anode, each anode row can be observed with uniform brightness, and the number of anode rows is 2" (yi
, is a positive integer), the use of a fluorescent display tube in which filaments are arranged for each (positive integer) has an excellent effect of reducing the amount of fresh air.

[Brief explanation of drawings]

1 and 2 are a plan view and a side view showing an example of the electrode arrangement of a fluorescent display tube, FIG. 3 is a circuit diagram showing an embodiment of the present invention, and FIG. A is a pulse signal waveform supplied to an AND gate, FIG. 95 is a waveform diagram of a voltage supplied to a driver, and FIG. 6 is a circuit diagram showing another example of the present invention. Mu Karasu~An@---...Anode row, Fl~Fm・Bite...
Filament%01~Gn...Grid, 1...
・Anode, 21 ~ t@...Shift register, s1
~3n...and gate. 4 Kame ~41...Fist Tryba, 51 ~Ss
@Ken/Maki Pulse Generation Nouns @M~6ronken-・Kenden 1 [. Figure 1 Figure 2 Fl FZ F3 F□ o o o -
--------. G1~Qno------------

Claims (1)

[Claims] Q) A method for driving a fluorescent display tube having a filament in the multi-unit O anode row*. Fluorescent embedded tube OWA operation mechanism characterized by supplying an amount of electric power according to the distance. A method for driving a moat pipe O (2) A patent claim characterized in that the amount of electric power is equal to the voltage of a signal. Patent claim 0*m, paragraph 1 of the invention, characterized in that the O anode array has a positive OII number (TMC rise is a positive OII number).
Show tube om * method.