JPS615292A - Driver for 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 [Field of Industrial Application] The present invention relates to a driving device for a fluorescent display tube that can drive the fluorescent display tube using any one of static driving, dynamic driving, and duplex driving.

[Conventional technology]

As a method for driving a fluorescent display tube (drive method),
Currently, three types of drive systems are known: dynamic drive system, static drive system, and duplex drive system.

The Daika Mink drive system is shown in Figure 8. Corresponding anode electrodes 41 are connected in common, and each of these common connection points is connected to each output terminal of the anode electrode driver 3°. 42 control electrodes Control electrode 1・'Leiper 3
1, the control electrode driver 31 selects the digit to be displayed, and the display contents of the selected digit are controlled by the anode electrode driver 30. (control electrode driver 31) and a driver for display control (anode electrode driver 30). Therefore, if the number of displayed digits changes, it is necessary to separately prepare a driver for selecting digits having a corresponding number of bits.

In addition, in the static drive method, each control electrode 42 is commonly connected and grounded as shown in FIG. Display is performed by controlling the sound of only the anode electrode by the anode electrode drivers 30-1 to 30-4. Therefore, if the number of displayed digits changes, will the anode electrode driver have the corresponding number of bits? Must be prepared. In FIGS. 8 and 9, 43 is a cathode, 44 is a cathode heating power source, and 45 is a resistor for applying a cut-off bias voltage. Also, e5 and ec are the anode electrode voltage, control electrode voltage k, and Ek is the cutoff bias, respectively. It shows.

Also, is the duplex drive method different from the above-mentioned dynamic drive method and static drive method? Mix it.

One static drive unit is made up of several digits, and this static drive unit is time-divisionally selected to drive a large number of digits mk. Therefore, if the number of display digits changes, the number of anode electrode drivers and the number of control electrode drivers must be changed accordingly.

In other words, in the conventional drive device, it is necessary to prepare dedicated driver sections depending on the number of display digits and the number of anode electrodes.

If the number of display digits is changed in this way, it is necessary to prepare different types of dry packages for different systems, which is not desirable in terms of the desire to standardize the circuit.

In addition, in the dynamic drive method and the duplex drive method, there are two drivers, an anode electrode driver and a control electrode driver.
What kind of driver is needed and this? There has been a strong desire to develop a drive circuit that can reduce the number of II'' to one.

[Purpose of the invention]

In view of the above circumstances, the present invention has been developed regardless of the arrangement and number of lead wires for the anode electrode and control electrode of a fluorescent display tube, and without any particular distinction between the anode electrode and the control electrode. The same type of driver can drive the fluorescent display tube in dynamic drive, static drive, or duplex [tll] mode.
It is an object of the present invention to provide a fluorescent display tube driving device that allows circuits to be shared.

[Structure of the invention]

In order to achieve this object, the fluorescent display tube driving device according to the present invention accelerates and controls the electron basin and control electrode emitted from the cathode, and selectively makes them collide with the anode to which an anode voltage is applied. In a driving device for a fluorescent display tube, which can display a display by exciting a phosphor layer and emitting light.

a display data generating section that converts inputs and signals to be displayed into pit signals and turn signals according to the lead wire arrangement order for the control electrode and the anode electrode; A temporary memory circuit section that temporarily stores signals, and a driver that converts the bit pattern signals stored in this temporary memory circuit section into sound control electrode voltages and anode voltages and applies them to each electrode of the fluorescent display tube via lead wires R. It is characterized by having a section.

[Effect]

The driving device for a fluorescent display tube according to the present invention focuses on the point that the control electrode voltage and the anode electrode voltage that must be constantly applied to the fluorescent display tube are the same due to the above-described configuration. , the input signals to be displayed according to the arrangement pattern of the anode electrode terminals are rearranged into serial data of the number of bits processed by the arrangement, and this data is serial/parallel converted and stored in the temporary storage circuit section. The driver section drives the fluorescent display tube based on the holding results.
Even if the arrangement pattern of the control electrode terminals and anode electrode terminals of the fluorescent display tube changes, the format of the serial data can be changed by simply changing the program of the CPU constituting the data generating section. It is designed to match the sequence pattern of .

[Example] This invention will be described below according to an example shown in the seventh drawing.

FIG. 1 is a functional block diagram showing an embodiment of a drive device according to the present invention. In this figure, 6 is a reference clock generation means consisting of a crystal oscillator, LC oscillator, etc.
The reference clock signal CL'K (see FIG. 5()) generated by the reference clock generating means 6 is supplied to the CPU (central processing unit) 1.

The CPUI is composed of a microprocessor, memory, etc., and processes external data Dlk supplied through seven data input terminals.
In other words, the data generation means 2.5HR (5hift Re
Waiting for clock generation means 3, display enable signal generation means 4, and strobe signal generation means 5.

First, the data generation means 2 operates based on the reference clock signal CLKK, and adjusts the lead wire arrangement of the external data Dxk display tube 12 supplied through the seven data input terminals according to the number of lead wires. This is to rearrange the data (serial data Dz). In other words, in this embodiment, the display tube 12 controlled by the CPU is 11.
To the book lead wire 12-□ 1, '2-u k Wait 4 digit day letter display type fluorescent display 'i! The lead wires 12-0□ to 12-□ of this fluorescent display tube 21 are connected to the control electrode terminals Gl for the 1st digit to the control electrode terminals G4 for the 4th digit, respectively, as shown in FIG. If the data is anode electrode terminal a - anode electrode terminal g, the data generating means 2 rearranges the external data D1 into serial data D2 in the format shown in FIG. 3. In addition, if the fluorescent display tube 21 in the display tube 12 controlled by the CPUI is one that has a different arrangement pattern of control electrode terminals and anode electrode terminals than this fluorescent display tube 21, this data generating means 2 Serial data Dz l in a format that matches the arrangement pattern of the control electrode terminal and anode electrode terminal
generate.

When the generation of this serial data D2 is completed,
The data generating means 2 generates a data transfer start signal Sok as shown in FIG. 5(C), and this is used to transfer the serial data D2 as shown in FIG. 5(B). When the serial data D2 is started, one bit from the right is supplied to the data input terminal 8b of the shift register section 8, and then when the last bit data of the serial data D2 is output, as shown in FIG. Then, a data transfer end signal Stk indicating that the transfer of the serial data D2 has been completed is generated and supplied to the display enable signal generating means 4.

The SHR clock generating means 3 generates the data transfer start signal So'! 11- When the clock signal CLKak is supplied, the clock signal CLKak is generated for the number of bits of the serial data D2 as shown in FIG. The clock signal CLKa is supplied to the clock terminal 8a of the shift register section 8, and the serial data Dzk is accumulated and stored in the shift register section 8 one bit at a time.

Further, the display enable signal generating means 4 stops outputting the enable signal EN as shown in FIG.
After this, when the display blanking time T2 has elapsed, the enable signal Ellt- is output again and supplied to the driver section 10, and at the same time as the output of the enable signal EN is stopped, as shown in FIG. Strobe trigger Sz
This strobe trigger s2 is supplied to the strobe signal generating means 5.

The strobe signal generating means 5 is connected to the strobe trigger 32.
When supplied to 〃1 and time T3. (However, T3<Tz
) Afterwards, a strobe signal STB is output as shown in FIG. 5(c), and this strobe signal STB is supplied to the latch circuit section 9. Latch circuit section 9 The shift register section 8 and driver section 〇 constitute the drive circuit 11, which is constructed as follows.

First, the shift register section 8 receives the clock signal CLKa.
Based on the serial arter Dz? It is constructed of 18 11-bit shift registers that take in r1 bits at a time and convert them into k'' parallel data D3Ki, and this parallel data D3 is supplied to the latch circuit section 9.Latch circuit section 9 is the strobe signal 5TBi
It is constructed with 19 11-bit latch elements that latch the above-mentioned 'nocrarel data Ds't when supplied, and the data obtained by this latch operation (
The latch data D4) is supplied to the driver section 10. The driver section 10 receives the latch data D<k when the enable signal EN is supplied, and has 11 AND gates that generate a drive voltage train VDk having a bit pattern that matches the bit pattern of the latch data D4. 2
0-1 to 20-u, and each voltage signal constituting this drive voltage train VD'il- is applied to each control electrode terminal G, -G4 of the display tube 12 and each anode. are supplied to electrode terminals a-H, respectively. Therefore, for example, if the data generating means 3 outputs the serial data Dzk of the pit node shown in FIG.
2" is displayed.

If the external data DI contains information kM for lighting the first digit, "5" is sent to the grid terminal G1 of the display tube 12.
A voltage indicated by '1'k (for example, 6V) is supplied, and a voltage indicated by 'O'' (for example,
Ov) is supplied. Therefore, in this case, only the first digit of the display tube 12 is the display information of the external data DI, as shown in FIG. 5 (IJ). indicate. After that, when the information kM of the second digit R lighting is supplied, the first digit of the display tube 12 is set to the clear state in the same manner as described above, as shown in FIG. The construction shown in Fig. 5 is then carried out [2
The bar will be displayed lit. Thereafter, in the same way, external data DI having information 2 for the 3rd digit lighting and external data D1 having information for the 4th digit lighting are input in sequence, as shown in FIG. 5).

As shown in (A), the third and fourth digits of the display tube 12 are lit up in sequence, and the display information of the external data D+ is displayed behind this.

In this way, this embodiment focuses on the fact that the control electrode voltage and the anode electrode voltage that must be applied to the display tube 12 are the same, and the arrangement pattern of the control electrode terminal and the anode electrode terminal of the display tube 12 is adjusted accordingly. External data Dlk
This is rearranged into serial data D2 in a format corresponding to the turn, converted into @/parallel data by the shift register section 8, latched by the latch circuit section 9, and based on the result of this latching, the driver section 10 outputs the data to the display tube 12? Since the I-drive is used, even if the lead wire arrangement pattern of the display tube 12 changes, the C
It is possible to change the format of the serial data D2 created here by changing the PUI Groderam, and thereby it is possible to drive 12 new display tubes without changing the hardware part of the circuit.

In other words, the circuit can be shared.

Furthermore, since the duty ratio of the enable signal EN outputted by the CPU can be arbitrarily changed by a program, this duty ratio can be changed to determine the ratio between the display time of each digit on the display tube 12 and the blanking time. change,
The display brightness of the display tube 12 can be changed.

Further, the drive (b) path 11 in the above-described embodiment is normally fixed as an IC (integrated circuit) on a glass substrate constituting the display tube 12, whereby the display tube 12 receives the clock signal CLKa and serial number. Since it is configured to directly receive data D2, strobe signal STB, and enable signal EN'i, the display tube 1
2. The number of terminals in the display unit including the drive circuit 11 can be greatly reduced, which makes it easier to assemble the display unit, and the weight of the display unit can be reduced. I can do it.

In addition, the drive voltage series VD output from the driver unit 10)
Since the control electrode terminals G1 to G4 of the display tube 12 and the anode electrode terminals a to gf are driven at the same level, the driving voltage series It can also be driven directly by a display tube. In this case.

Of course, the program can be changed to match the format 1x of the serial data D2 output from the data generating means 3 and the terminal arrangement and e-turn of the fluorescent display tube to be used.

Furthermore, in the above-described embodiment, the same voltage is applied to the control electrode and the anode electrode of the display tube 12, but
In the case of a fluorescent display tube in which these must be made different, for example, in the case of arranging anode electrodes coated with phosphors of different emission colors in the same display tube, or in the case of a fluorescent display tube with a graphic display, as shown in Figure 6. As shown in FIG. 10, 22 resistors may be connected to the output terminal of the driver unit 10 to reduce the voltage value applied to the anode electrode by the voltage drop. Alternatively, as shown in FIG. , 24.
25 and a transistor 26, a voltage corresponding to the resistance ratio of the resistors 23 and 24 may be supplied to the display tube 12.

〔effect〕

As explained above, the fluorescent display tube driving device according to the present invention converts the signal to be displayed by the display data generating section into a bit pattern signal according to the lead wire arrangement order of the full fluorescent display tube, and converts this signal into a bit pattern signal according to the lead wire arrangement order of the full fluorescent display tube. After memorizing it,
This bit pattern signal is converted into a control voltage and an anode voltage in the driver section and applied to each electrode of the fluorescent display tube. Therefore, one type of driver can drive dynamic, static, and 7" fluorescent display tubes. It can be driven by any of the following, which makes it possible to share the circuit.Also, the display time and blanking
Time duty ratio? Adjust brightness by changing? Modularization of the dryer section can be easily achieved.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing one embodiment of a fluorescent display tube driving device according to the present invention, and FIG. 2 is a diagram showing the relationship between the bits of serial data D2 used in this embodiment and the operation of the display tube 12. , FIG. 3 is a diagram showing an example of the format of the same serial data, FIG. 4 is a diagram showing an example of J-turn of the same serial data, and FIG. 5 is a timing chart for explaining the functional block diagram shown in FIG. 1. , FIG. 6 is an example of a voltage shift (b) path that can be used in this invention. The circuit diagram shown in FIG. 7 is another example of a voltage shift circuit that can be used in the present invention. The circuit diagram shown in Figure 8 is a dynamic drive system known from the conventional power generation system. The circuit diagram shown in Figure 9 for explanation is the static drive system known from the prior art. FIG. 2 is a circuit diagram for explanation. DESCRIPTION OF SYMBOLS 1... Display data generation part (CPU), 8... Temporary memory circuit part (shift reno star part), 9... Latch circuit part, ]0... Driver part, ]2... Fluorescent display tube (display part), 01~(4...grid terminal, a-g...anode terminal. Fig. 6 Fig. 7

Claims (1)

[Scope of Claims] A fluorescent display tube in which electrons emitted from a cathode are accelerated and controlled by a control electrode, and are caused to selectively impinge on an anode to which an anode voltage is applied, thereby exciting a phosphor layer to emit light and producing a display. The drive device includes: a display data generation unit that converts an input signal to be displayed into a bit pattern signal according to the lead wire arrangement order for the control electrode and the anode electrode; and the bit pattern generated by the display data generation unit. A temporary storage circuit section that temporarily stores signals, and a temporary storage circuit section that stores the bits and bits stored in this temporary storage circuit section.
A driving device for a fluorescent display tube, comprising a driver section that converts a pattern signal into a control electrode voltage and an anode voltage and applies the converted signals to each electrode of the fluorescent display tube via a lead wire.