CN103226926B

CN103226926B - Vacuume fluorescent display module and driving method

Info

Publication number: CN103226926B
Application number: CN201310028846.1A
Authority: CN
Inventors: 刈谷真
Original assignee: Futaba Corp
Current assignee: Futaba Corp
Priority date: 2012-01-26
Filing date: 2013-01-25
Publication date: 2016-04-27
Anticipated expiration: 2033-01-25
Also published as: TW201331927A; JP2013152394A; CN103226926A; KR101437519B1; TWI521501B; KR20130086963A; JP5515068B2

Abstract

The present invention relates to Vacuume fluorescent display module and driving method, object is openly a kind of VFD with brightness adjustment function, especially seeks to prevent perceiving when terminating in low-light level to produce display flicker.The difference resulting from its marginal position of the beginning sequential of the front anode shinny period scanned each time relative to grid is fixing filament drive singal, and drives filament according to this drive singal.Whereby, (signal and anode signal all become conducting during) filament drive singal can be prevented terminating in anode shinny period and becomes length during H level by scanning and difference at every turn, or, even if produce difference, this difference also can be made to have systematicness.As a result, can prevent the brightness perceiving each scanning from declining, and can seek to prevent display flicker.

Description

Vacuume fluorescent display module and driving method

Technical field

The invention relates to the driving method of a kind of Vacuume fluorescent display module (module) and fluorescent display tube, this Vacuume fluorescent display module possesses fluorescent display tube and driving circuit portion thereof and forms.

Background technology

(background technology document)

(patent documentation)

Patent documentation 1: Japanese Unexamined Patent Publication 8-278763 publication

Figure 15 is the general structural map of VFD (VacuumFluorescentDisplay, vaccum fluorescent tube).

In addition, in fig .15, be extract out and show the structure of the part about display of the information of only one digit number about the structure of VFD.

As the VFD of prior art, be in vacuum tank, be configured with filament (filament) 100 (direct heating type negative electrode), grid (grid) 101, anode (segment) 102.In VFD, be apply alternating voltage to filament 100 to make it heat and thermoelectron is released, and make that this thermoelectron accelerates and the fluorophor collided on anode 102 makes this light-emitting phosphor in grid 101, and carry out desired figure (pattern) display.

Described thermionic acceleration is undertaken by applying DC voltage to grid 101.Grid 101 is actually and arranges corresponding to figure place showing, and can carry out by applying DC voltage to which grid 101 selecting the figure place that should show.

Moreover, when anode 102 being set to display device (device) such as about alphameric characters, be as diagram is formed to have the mode of multiple section for a grid (figure place).Now, the selection of anode (section) 102 is undertaken by applying DC voltage to the anode 102 met.

Making set information displaying when set figure place showing, is that the grid 101 formed corresponding to this figure place showing and the anode 102 subscribed apply DC voltage.Whereby, the thermoelectron that the fluorophor on the set anode 102 of only this figure place showing can be released due to filament 100 and bring out luminescence, and realize set information displaying.

Figure 16 is the figure in order to be described for signal g during information displaying, anode signal a.

In this, for convenience of explanation, be four that as shown in Figure 16 A the quantity (quantity of figure place showing) of grid are set to G1 to G4.Moreover, in each figure place showing (grid G), with regard to anode A, be set to seven that are formed with A1 to A7 as shown in fig 16b.

Figure 16 C, Figure 16 D are signal g1 to g4, anode signal a1 to a7 when showing " 4321 " of the display as illustrated in Figure 16 A as the numerical value of four figures respectively.

In addition, signal g1 to g4 shows the drive singal person about grid G 1 to G4 respectively, and anode signal a1 to a8 shows the drive singal person about anode A 1 to A8 respectively.

Such as, when being only described for the grid G 1 of figure place showing corresponding to front, in example when this situation, the numerical value that should be shown in the figure place of this grid G 1 is " 4 ", therefore should the anode A of movable (active) be anode A 2, A3, A6, A7 four.Therefore, between the selecting period of grid G 1 (signal g1 is conducting (ON) period), be that conducting corresponds to these anode A 2, the anode signal a2 of A3, A6, A7, a3, a6, a7 respectively.

Whereby, the display of the numerical value " 4 " of the figure place of grid G 1 is realized.

In addition, explain to confirm, from grid G 1, grid G 2, G3, G4 sequentially become conducting, and to grid G 1 becomes conducting once again during, be set to one scan during.So scan grid G (namely sequentially selecting each grid G) by one side with the set cycle, one side with set sequential (timing) anode A that suitably conducting is set, and can show set information by every units.

But, in VFD, be made adjustable display brightness person.

With regard to the gimmick of the brightness adjustment of VDF, the gimmick of the load (duty) of the ON/OFF (OFF) changing anode signal a can be for example there are, or the gimmick of the load of the ON/OFF of change signal g.

According to Figure 17, for the change of the ON/OFF by anode signal a, and the gimmick of carrying out brightness adjustment is described.

In this Figure 17, only illustrate and have the signal g1 of the drive singal belonging to signal G1, with the relation of anode signal a1 of drive singal belonging to anode A 1.That is, for only illustrating the brightness adjustment person of the anode A 1 had about grid G 1.

As shown in the figure with regard to the gimmick of this situation, being that the conduction period of anode signal a is lengthened when corresponding to high brightness, then the ON time of anode signal a being shortened when corresponding to low-light level.

If be set as longer by the ON time of anode signal a, then the anode of anode A shinny period can be elongated.On the other hand, if be set as shorter by the ON time of anode signal a, then the anode of anode A shinny period can shorten.

So adjusted the length of anode shinny period by the conduction period of change anode signal a, and realize the adjustment of brightness whereby.

In addition, explanation according to described Figure 16 also can understand, so-called " anode shinny period ", refer to the signal g about the grid G (being now G1) of the forming position corresponding to this anode A and the anode signal a (being now anode signal a1) about this anode A become conducting simultaneously during person.

Determine that if so consider " the anode shinny period " of display brightness is for during signal g and anode signal a is all conducting, then adopt be not change anode signal a but change the gimmick of conduction period of signal g time, also can realize same brightness adjustment is do not say to explain.

But in VFD, with regard to determining the key element of brightness, though its main person is the length of described anode shinny period, but with regard to other key element, the driving voltage of filament 100 also can become the essential factor making brightness change.Specifically, within anode shinny period, the filament driving voltage length become during H level (level) to become the key element determining brightness.This is due to during in anode shinny period, filament driving voltage becomes H level, and filament 100 diminishes with the potential difference (PD) of grid 101 and anode 102, and is decline to the brightness that should change anode 102.

Accordingly, in the past, with regard to filament driving voltage (filament drive singal), be set as the signal that generation and signal and anode signal are asynchronous (frequency and phase place).This is due in order to make thermoelectron release from filament 100, only need drive filament 100 with the alternating voltage of both fixed cycles.

Formation about the generation system of filament driving voltage (being symbol that is attached and Ef below) is in the past disclosed in such as described patent documentation 1 (particularly Fig. 3).

Fig. 3 with reference to this patent documentation 1 can understand, filament driving voltage Ef in the past applies special secondary coiling at the secondary side of the transformer with DC/DC converter (converter) (transformer), and the alternating voltage obtained as this secondary coiling, and to be made with the anode signal a produced according to set clock signal and signal g be asynchronous signal.

Summary of the invention

(invention institute for solution problem)

Therefore, as as described in using in the VFD be in the past made to relative to signal g and anode signal a as asynchronous filament drive singal, especially carrying out in the state controlled in response to brightness adjustment during in low-light level in the mode shortened shinny for anode period, the problem of the flicker experiencing display can be produced.

Figure 18 is the figure in order to be described for the generation principle of so display flicker.

In this Figure 18, be by the m having grid G 1 to Gm in a VFD grid G and have anode A 1 a to An n anode A premised on, and illustrate the waveform of signal g1 to gm, anode signal a1 to an.

Moreover, in Figure 18, about brightness adjustment, be the brightness of the anode A 1 being directed to grid G 1.In the drawings, " the shinny period of the A1 of G1 " is the anode shinny period (signal g1 and anode signal a1 all become conducting during) of the anode A 1 of grid G 1 when being presented at comparatively high brightness.And in the drawings, be the anode signal a1 of the anode A 1 of the grid G 1 when being presented at low-light level, and the anode signal shinny period of the anode A 1 of the grid G 1 when this low-light level is shown as " the shinny period of the A1 of G1 during low-light level ".

In Figure 18, with regard to " Ef in the past ", though show the waveform of filament driving voltage Ef in the past, but with reference to should " Ef in the past " understanding, filament driving voltage (drive singal) Ef is in the past made for relative to the signal g in order to determine anode shinny period and anode signal a, and position phase and frequency are asynchronous signal.Therefore, edge sequential (edgetiming) (marginal position) of filament driving voltage Ef be not consistent relative to the beginning sequential of the anode shinny period according to signal and anode signal, and the relation of these sequential changes along with scanning (scan) at every turn.That is, the marginal position of these filament driving voltages Ef and the relation of the beginning sequential of anode shinny period are variant along with scanning at every turn.

The marginal position of filament driving voltage Ef like this and each of the beginning sequential of anode shinny period scan produce difference time, during within anode shinny period, filament driving voltage Ef becomes H level, the length of (i.e. the potential difference (PD) of filament and grid and anode diminish and during brightness declines) also can produce difference by scanning at every turn.

In the drawings, be presented at during in anode shinny period, filament driving voltage Ef becomes H level with oblique line, if during with reference to this oblique line portion, it is variant by each scanning for can confirming the filament driving voltage Ef length become during H level in anode shinny period.

Can understand from described explanation, by being that asynchronous filament driving voltage Ef drives in the background technology of filament 100 for signal g or anode signal a, be that its anode brightness can produce difference by each scanning.

The difference of brightness so becomes the reason making display produce flicker.

But the difference (flicker of display) of brightness so is become to be difficult to discover under carrying out in the mode making anode shinny period lengthen the state controlled when corresponding to high brightness.Namely, under the state making anode shinny period lengthen when corresponding to high brightness, due to the filament driving voltage Ef in this anode shinny period pulse (pulse) number become many (potential difference (PD) between anode inner grid-filament of shinny period diminish during shared by ratio change many), therefore relative to the difference by each brightness scanned that the difference of the marginal position of the filament drive singal of the beginning sequential of described anode shinny period causes, be tail off because changing.Therefore, when high brightness, be the flicker being difficult to the display discovered by each scanning.

Relative to this, when carrying out in the mode making anode shinny period shorten the situation controlled when corresponding to low-light level, as diagram, because the umber of pulse of the filament driving voltage Ef in this anode shinny period tails off, therefore relative to the measures of dispersion by each brightness scanned that the difference of the marginal position of the filament driving voltage Ef of the beginning sequential of described anode shinny period causes, be become large, result compared with during high brightness, the flicker of the display easily discovered by each scanning can be become.

In fact, become in the situation of less than roughly three with the umber of pulse confirming the filament driving voltage Ef within anode shinny period, can be observed the flicker of so display (in addition, though the umber of pulse of the filament drive singal in the anode shinny period in figure 18 when corresponding to high brightness is less than three, but this is the person of causing due to illustrated state).

The present invention is developer in view of described problem, and its problem is the VFD for brightness-adjusting, is especially the generation of the display flicker seeking to prevent from discovering when low-light level.

(in order to solve the means of problem)

In order to solve described problem, the present invention forms Vacuume fluorescent display module in the following manner.

That is, Vacuume fluorescent display module of the present invention comprises the fluorescent display tube being formed with anode, grid, filament.

Moreover, have the filament drive singal producing filament drive singal and produce means, the filament drive singal produced, it is positioned at the difference of this marginal position of the beginning sequential relative to front anode shinny period of the front of each scan period of described grid, is fixing person in each scan period.

Moreover, have according to described filament drive singal to drive the filament driving means of described filament.

Moreover the present invention is that motion has following methods as driving method.

Namely, driving method of the present invention is in order to drive the driving method of fluorescent display tube including anode, grid, filament, that there is the filament drive singal generating routine producing filament drive singal, the filament drive singal produced, it is positioned at the difference of this marginal position of the beginning sequential relative to front anode shinny period of the front of each scan period of described grid, is fixing person in each scan period.

Moreover, there is the filament driver driving described filament according to described filament drive singal.

As described in foundation be fixing filament drive singal relative to being worse than in each scan period of this marginal position of the beginning sequential of front anode shinny period, can prevent terminating in anode shinny period, filament drive singal become length during H level by each scanning difference.Or, even if produce difference, this difference also can be made to have systematicness.

In anode shinny period, if can prevent filament drive singal from becoming the difference by each scanning of the length during H level, the decline of the brightness by each scanning can be prevented, and the flicker preventing display can be sought.

Or, as described in by the difference of the length during can making by the H level of the filament drive singal of each scanning, there is systematicness, also can prevent the flicker perceiving display.

At this, such as, for certain anode, the slippage that the filament drive singal within the anode shinny period of first time scanning becomes the brightness that H level causes is set to " N ".Now, by the difference of each scanning, there is systematicness if can make, the slippage that then such as filament drive singal can be become the brightness that H level causes within the anode of this anode of the scanning of the even-times shinny time is set to " 0 ", and the slippage that filament drive singal can be become the brightness that H level causes within the shinny time of this anode of the scanning of odd-times is set to " N ".If the difference of the brightness by each scanning can be made to have systematicness so, then discover the flicker less than display with can making human vision.Namely, the cycle that scans due to grid is set to the comparatively high speed person such as such as 120Hz, even if therefore as described in by each scanning and produce the light/dark of brightness, the brightness respective due to " bright " " secretly " is identical, thus discover while human vision can be made less than show flicker.

(effect of invention)

According to described the present invention, for the VFD (fluorescent display tube) of brightness-adjusting, the display flicker can perceived when low-light level especially can be prevented.

Accompanying drawing explanation

Fig. 1 is the figure in order to be described for the driving gimmick as the 1st example.

Fig. 2 is for display is as the figure of the Inner Constitution of the VFD module of the 1st example.

Fig. 3 is the sequential chart driving clock frequency about generation filament for the 1st example.

Fig. 4 is for display is as the figure of the Inner Constitution of the VFD module of the 2nd example.

Fig. 5 is the sequential chart driving clock frequency about generation filament for the 2nd example.

Fig. 6 is the figure in order to effect during filament drive singal for use the 2nd example.

Fig. 7 is for display is as the figure of the Inner Constitution of the VFD module of the variation of the 2nd example.

Fig. 8 is for display is as the figure of the Inner Constitution of the VFD module of the 3rd example.

Fig. 9 is the sequential chart driving clock frequency about generation filament for the 3rd example.

Figure 10 is the figure in order to effect during filament drive singal for use the 3rd example.

Figure 11 be for be presented at produce the umber of pulse between each grid selecting period is set to the filament drive singal of odd number time, the filament that should possess drives the figure of the configuration example of clock generation circuit.

Figure 12 is the figure for the filament in order to drive clock generation circuit to produce for filament as shown in Figure 11 drives clock frequency to be described.

Figure 13 is for display is as the figure of the Inner Constitution of the VFD module of the variation of the 3rd example.

Figure 14 is the figure for the variation in order to drive for the interchange of filament is described.

Figure 15 is the general structural map for VFD.

Figure 16 is the figure in order to be described for the signal (g) during information displaying, anode signal (a).

Figure 17 is the figure in order to be described for the brightness adjustment of VFD.

Figure 18 is the figure in order to be described for the generation principle of display flicker.

Primary clustering symbol description

1VFD

1a filament

2、10CPU

3 controllers

4 drivers

5,11 filaments drive clock generation circuit

5a reverser

6 filament driving circuits

11a OR circuit

A1 to An anode

A1 to an anode signal

G1Gm negative electrode

G1gm cathode signal

Vd DC voltage

CK clock frequency terminal

Q, Q (upper graticule) lead-out terminal

Q1 to Q5 changeover module

F_CLK, F_CLK1, F_CLK2 filament drives clock frequency

Ef filament driving voltage

Receive diode ZD season

VHA anode voltage

VHG grid voltage.

Embodiment

Be described for example of the present invention below.

In addition, explanation carries out with following order.

< 1. the 1st example (being synchronized with the filament drive singal of INT signal) >

< 2. the 2nd example (being synchronized with the filament drive singal of BK signal) >

< 3. the 3rd example (being synchronized with the filament drive singal of GCP signal) >

< 4. variation >

Fig. 1 is the figure in order to be described for the driving method as the 1st example.

At this, comprise this Fig. 1 interior and in the following description, as being formed at VFD (VacuumFluorescnetDisplay, fluorescent display tube) grid G, anode A, m (m is the natural number of more than the 2) grid G having grid G 1 to Gm, and the n of anode A 1 to An (n is the natural number of more than 2) anode A.Moreover the drive singal for grid G 1 to Gm marks as signal g1 to gm respectively, and the drive singal for anode A 1 to An marks respectively as anode signal a1 to an.

In Fig. 1, as the example of the waveform of these signal g1 to gm and anode signal a1 to an, be illustrate to have the waveform same with described Figure 18.For anode signal a1, be also signal during low-light level is shown in the lump.

Moreover " Ef in the past " in figure is display filament drive singal (driving voltage) person in the past in the same manner as the situation of Figure 18.

In this Fig. 1, identical with described Figure 18, be the brightness of the anode A 1 being directed to grid G 1 for brilliance control.In figure, " the shinny period of the A1 of G1 " is anode shinny period (signal g1 and anode signal a1 be all conducting during) of the anode A 1 of grid G 1 when being presented at comparatively high brightness in the same manner as the situation of Figure 18.Moreover " the shinny period of the A1 of G1 during low-light level " is the shinny period person of the anode A 1 of grid G 1 when being presented at low-light level in figure.

As the explanation at Figure 18, when using and signal g and anode signal a is asynchronous " Ef in the past ", due to the beginning sequential of the anode shinny period during all becoming conducting as signal g and anode signal a, can by scanning and difference at every turn with the pass of the edge sequential (marginal position) of filament driving voltage Ef, therefore the length of (potential difference (PD) of filament and grid and anode diminishes and during brightness declines: the oblique line portion in figure) also can produce the difference by scanning at every turn during within anode shinny period, filament driving voltage Ef becomes H level, result, become the difference producing brightness by each scanning.

Though the luminance difference of so each scanning can become the essential factor of display flicker, but as described in, the flicker of display is difficult to discover under carrying out in the mode making anode shinny period lengthen the state controlled when corresponding to high brightness, and especially easily discover under carrying out in the mode making anode shinny period shorten the state controlled when corresponding to low-light level.

Compare at this and become length during H level corresponding to " Ef in the past " in " the shinny period of the A1 of G1 " during high brightness, in interior with " the shinny period of the A1 of G1 during low-light level ", " Ef in the past " becomes the length during H level, is to become larger than the measures of dispersion (the change ratio of the length of this period of each scanning) of each scanning of the length of this period during high brightness when can find out low-light level significantly.

In the present invention, glimmer to prevent producing perceptible display in so when low-light level, with regard to filament drive singal, use a kind of signal, this signal is the difference of this marginal position of the beginning sequential of the front anode shinny period of front relative to each scan period being positioned at grid, is fixing person in each scan period.Namely, in the example shown in Fig. 1, be using the difference of the marginal position of the beginning sequential relative to the front anode shinny period during all becoming conducting as signal g1 and anode signal a1 be in each scan period for fixing mode, produce filament drive singal (driving voltage) Ef.

Specifically, in the 1st example, be produce a kind of signal as filament drive singal Ef, for making its marginal position consistent (synchronously) in the signal (being more specifically be INT signal described later) of the scan period of display grid.

In FIG, be that the filament drive singal Ef produced by the 1st example is shown as " Ef of this example ".If the filament drive singal Ef illustrating this example is the signal reversed by scanning each time becoming grid.

According to the filament drive singal Ef of the 1st example as " Ef of this example " so, as diagram, filament drive singal Ef within anode shinny period can be become the length during H level, when the scanning of odd-times, be set to both fixed length (being set to " N "), and be set to when the scanning of even-times " 0 ".That is, though the length that filament drive singal Ef becomes during H level within anode shinny period can produce difference by each scanning, but this difference can be made to have systematicness.

At this, the scan period of grid is set to the comparatively high speed person such as such as 120Hz.Therefore, even if as described in by each scanning and produce the light/dark of brightness, also because the brightness that these " bright " " secretly " are respective is identical (" N " or " 0 ") therefore the mankind can be made visually can not to discover the flicker of display.

In addition, though the anode A 1 only for grid G 1 in Fig. 1, and illustration has " filament drive singal Ef becomes the length during H level within anode shinny period ", but according to the filament drive singal Ef as described 1st example, for the anode A of all other, " filament drive singal Ef becomes the length during H level within anode shinny period, becomes when the scanning of odd-times " N ", and become when the scanning of even-times " 0 " " is also set up.That is, for whole anode A, be the display flicker can sought when preventing low-light level.

Fig. 2 is that display is in order to realize the figure of the Inner Constitution of the VFD module as the 1st example driven by the described illustrated filament as the 1st example.

In addition, VFD module becomes, in response to from be connected in the mode can carrying out data communication this VFD module main frame (host) machine instruction and carry out the module of required information displaying.

If the VFD module being illustrated in the 1st example includes: VFD1; CPU (CentralProcessingUnit, center processing unit) 2; Controller (controller) 3; Driver (driver) 4; Filament drives clock generation circuit 5; And filament driving circuit 6.

VFD1 is fluorescent display tube, and in this vacuum tank, be formed with m the grid G of grid G 1 to grid G m, n the anode A of anode A 1 to anode An and filament 1a.

CPU2 is configured to comprise: calculation unit; ROM (ReadOnlyMemory, ROM (read-only memory)); And RAM (RandomAccessMemory), and described calculation unit is according to being stored in the program (Program) of described ROM and calculating.Described RAM is the data (data) carrying out processing for being temporarily stored in CPU2.

CPU2 is in response to the instruction (instruction about the information that should show) from host machine, by performing the process according to the program (program) predetermined, and carry out producing the gate data of the information belonged to about each how driving m the grid G being formed at VFD1, and produce the anode data (be by these tokens be " data " at figure) belonging to information about each how driving n anode A.

CPU2 carries out these gate data, the generation of anode data and output processing according to coming of then the illustrating INT signal (signal of the scan period of display grid) that self-controller 3 supplies.

Controller 3 is that the various clock signal such as described INT signal is produced, and corresponds respectively to the gate data of the m system of grid G 1 to Gm for driver 4 supply, and corresponds respectively to the anode data of n system of anode A 1 to An.

At this, with regard to the clock signal that controller 3 produces, be for example there are described INT signal, BK signal and GCP signal.

BK signal is in the scanning motion undertaken by sequentially selecting each grid G of grid G 1 to Gm, becomes the signal that display switches the cycle of the selection of grid G.

Moreover the brightness adjustment that GCP signal carries out for the length by adjustment anode shinny period is the periodic signal of the section becoming this adjustment width of display.

The INT signal that controller 3 produces supplies CPU2.Moreover in the situation of this example, this INT signal also drives clock generation circuit 5 to supply for filament as graphic.

On the other hand, the BK signal that produces of controller 3 and GCP signal supply driver 4.

Input respectively by omitting the grid voltage VHG (DC voltage) that produces of graphic power circuit in driver 4, and anode voltage VHA (DC voltage).

Driver 4 is the gate data corresponding respectively to grid G 1 to Gm according to supplying from controller 3, and ON/OFF grid voltage VHG (carrying out switching action (switching)), produce respectively whereby and export signal g1 to gm.

Moreover driver 4 is the anode data corresponding respectively to anode A 1 to An according to supplying from controller 3, and switches anode voltage VHG, produce respectively whereby and output anode signal a1 to an.

Be described in this for confirmation, signal g1 to gm is in order to drive the signal being formed at grid G 1 to the Gm of VFD1 respectively, and anode signal a1 to an is in order to drive the signal being formed at anode A 1 to the An of VFD1 respectively.

Filament driving clock generation circuit 5 is the circuit of the driving of the filament needed for the drive singal clock frequency F_CLK in order to produce to produce filament 1a.

Filament now drives clock generation circuit 5 to be the flip-flop 5a being configured to comprise D flip-flop (flip-flop).DC voltage Vd is the data terminal (D) inputing to this flip-flop 5a, and is the INT signal that input carrys out self-controller 3 for clock frequency terminal (CK).

Whereby, in the lead-out terminal (Q) of flip-flop 5a, inverted output terminal, (Qbar (upper graticule) is that the filament that can obtain respectively reversing by the position, each rising edge of INT signal drives clock frequency F_CLK1, F_CLK2.

In addition, drive clock frequency F_CLK as filament and produce two kinds of clock frequencies of F_CLK1, the F_CLK2 belonging to inverse relation respectively, be have filament driving circuit 6 in order to make it correspond in this example as described later, this filament driving circuit 6 exchanges by what is called the driving that type of drive carries out filament 1a.

In the sequential chart (timingchart) driving clock frequency F_CLK about generation filament that Fig. 3 is display the 1st example.

In addition, this Fig. 3 be display signal g1 to gm, INT signal, filament drive clock frequency F_CLK and filament drive singal Ef.

First, also can understand from explanation up to the present, during one scan be mean into, in the scanning motion of turn in order signal g1 to gm (namely sequentially select grid g1 to gm), from signal g1 become conducting rear to this signal g1 becomes conducting once again during.

INT signal used in this example is as diagram, and this position, rising edge is the signal of the beginning sequential be configured to during display one scan.

As described in illustrated by, the filament of the 1st example drives clock frequency F_CLK (with reference to graphic middle F_CLK1), is produced into the signal reversed by the position, rising edge of this INT signal each.That is, be configured to the signal person reversed by every one scan.

Be accompanied by this, drive the filament drive singal Ef that produces of clock frequency F_CLK as according to this filament, also as described in Fig. 1 shown in, become the signal reversed by every one scan.

Get back to Fig. 2 to go on to say.

The filament that filament drives clock generation circuit 5 to produce drives clock frequency F_CLK1, F_CLK2 to be supplied to filament driving circuit 6.

Filament driving circuit 6 is configured to drive clock frequency F_CLK1, F_CLK2 according to these filaments and drive filament 1a by exchanging type of drive.

Specifically, filament driving circuit 6 is configured to comprise: the first series-connection circuit, is the changeover module Q2 of changeover module Q1 and NchMOS-FET being connected in series Pch (ch:channel, channel) MOS-FET; Second series-connection circuit is the changeover module Q4 of changeover module Q3 and NchMOS-FET being connected in series PchMOS-FET; And receive diode (Zenerdiode) ZD season.

As diagram, the source electrode (source) of changeover module Q1 and the source electrode of changeover module Q3 are the positive potential sides being all connected to filament E_f, and the drain electrode of changeover module Q1 is the drain electrode being connected to changeover module Q2, and the drain electrode of changeover module Q3 is the drain electrode being connected to changeover module Q4.

Moreover the source electrode of changeover module Q2 and the source electrode of changeover module Q4 are the negative potential sides (E_f-) being all connected to thread terminal voltage E_f.

Moreover the tie point for changeover module Q1 and changeover module Q2 is the end of the side being connected with filament 1a, the tie point for changeover module Q3 and changeover module Q4 is the end of the opposing party being connected with filament 1a.

At this, if thread terminal voltage E_f be configured to drive needed for filament 1a want the DC voltage of level, need not be particularly limited to about this generation gimmick.In this example, for thread terminal voltage E_f, be set to abridged power circuit institute producer in diagram to input the voltage of filament driving circuit 6.

The diode ZD that receives in season is by under the state of its plus earth, negative electrode (cathode) is connected to the tie point (i.e. E_f) of the source electrode of changeover module Q2 and the source electrode of changeover module Q4.

In addition, the diode ZD that receives in season be in order to prevent so-called leak luminous, and in order to apply to block bias voltage and person's of setting (such as with reference to following list of references 1,2) to grid G and anode A.

List of references 1... Japanese Unexamined Patent Publication 2-190893 publication

List of references 2... Japanese Unexamined Patent Publication 2007-72323 publication

In addition, replace receive diode ZD season by arranging resistance, described in also can applying, block bias voltage.

The filament being supplied to filament driving circuit 6 drives clock frequency F_CLK1 to be imparted to the changeover module Q1 of the first series-connection circuit and the grid (gate) of changeover module Q2.

Moreover filament drives clock frequency F_CLK2 to be imparted to the changeover module Q3 of the second series-connection circuit and the grid of changeover module Q4.

In the filament driving circuit 6 of described formation, during filament drives clock frequency F_CLK1 to become H level, namely during filament drives clock frequency F_CLK2 to become L level, be changeover module Q2 and changeover module Q3 be combined into conducting, and changeover module Q1 and changeover module Q4 be combined into shutoff.In this period, heater current flows via changeover module Q3 → filament 1a → changeover module Q2.Heater current is now called clockwise direction heater current.

On the other hand, during filament drives clock frequency F_CLK1 to become L level in (F_CLK2 become H level during), then conversely for changeover module Q2 and changeover module Q3 be combined into shutoff, and changeover module Q1 and changeover module Q4 be combined into conducting, heater current flows via changeover module Q1 → filament 1a → changeover module Q4 whereby.That is, flowing has rightabout heater current.

As be set forth in filament driving circuit 6, be drive filament 1a (even if thermoelectron releasing) by the mutual rightabout heater current that flows, and carry out what is called exchange drive.

Then, be described for the 2nd example.

2nd example produces to make its marginal position be synchronized with the signal of sequentially selecting the switching cycle of grid of display with scanning motion, and as filament drive singal Ef.

Specifically, the signal of the signal that the marginal position producing a wherein side of the rise/fall for described BK signal makes its marginal position synchronous, and drive clock frequency F_CLK as filament.

Fig. 4 is the figure of display as the Inner Constitution of the VFD module of the 2nd example.

In addition, in the explanation after headed by this Fig. 4, be additional same-sign for the part identical with the part illustrated and omit the description.

In Fig. 4, the VFD module of the 2nd example is compared with the VFD module of the 1st example, and difference is: be the BK signal of self-controller 3 in the future but not INT signal inputed to filament driving clock generation circuit 5 (the clock frequency terminal of reverser 5a).

Fig. 5 is the generation of display the 2nd example drives clock frequency (F_CLK) sequential chart about filament.

First, the BK signal that this example is used is the signal that its position, drop edge is the selection switching sequence being configured to display grid G as illustrated.The pulse width of BK signal is configured to very short person, and the marginal position as diagram rise and fall signal is closely.

In addition, explain to be confirmed to be, the pulse width of BK signal is fixing.

As described in explanation, driving clock generation circuit 5 (reverser 5a) by filament, is produce the signal that reverses by the position, rising edge of each input signal to drive clock frequency F_CLK as filament.

Therefore, drive with regard to clock frequency F_CLK1 with regard to filament now, as shown in Figure 5, the signal reversed by the position, rising edge of each BK signal can be obtained, moreover, with this situation, also there is as filament drive singal the waveform reversed as the illustrated position, rising edge by each BK signal.

Fig. 6 is the figure in order to effect during filament drive singal EF for use the 2nd example.

In addition, be in order to illustrated convenience at Fig. 6, and be only formed with three of G1 to G3 as grid G (namely only having g1 to g3 as signal g).Moreover, with regard to Fig. 6, only be directed to anode A 1, the anode signal a1 belonging to the drive singal of this anode A 1 is as diagram, illustration have select grid G 1 time=conducting, select grid G 2 time=conducting, select grid G 3 time=shutoff (that is, only the anode A 1 of grid G 1 and the anode A 1 of grid G 2 shinny) situation.

Accordingly, be directed to the anode A 1 (anode A of the shinny object of odd number grid G) of the grid G 1 being configured to shinny object, and the anode A 1 (anode A of the shinny object of even number grid G) of grid G 2, then in the one scan, can know relative within the anode shinny period of the anode A 1 about grid G 1, have (" having " in figure) during filament drive singal Ef becomes H level, and be do not have (in figure "None") during filament drive singal Ef becomes H level within the anode shinny period of the anode A 1 about grid G 2.

And, in second time scanning, then during anode filament drive singal of the shinny period Ef of the anode A 1 of grid G 1 becomes H level, become "None" conversely, and become " having " during filament drive singal Ef becomes H level within the anode shinny period of the anode A 1 of grid G 2, and in third time scanning, then closing is switch once again, become " having " during anode filament drive singal of the shinny period Ef of the anode A 1 of grid G 1 becomes H level in the same manner as first time is scanned, and become "None" during filament drive singal Ef becomes H level within the anode shinny period of the anode A 1 of grid G 2.

In addition, in the drawings, become the presence or absence during H level about filament drive singal within anode shinny period, be the presence or absence of this period of the anode A 1 by circle mark display grid G 1, and shown the presence or absence of this period of the anode A 1 of grid G 2 by square mark.

According to the filament drive singal Ef of the 2nd example so produced according to BK signal, about the anode A of shinny object, during filament drive singal becomes H level within this anode shinny period, " having "/"None" (namely by each scanning, brightness slippage being set to " N "/" 0 ") can be set to by each scanning, therefore, becoming about filament drive singal Ef within anode shinny period the brightness that H level causes to decline, is to make it have the systematicness same with the 1st example by the difference of each scanning.

Therefore, the flicker shown also can be prevented according to the 2nd example.

Moreover, with regard to described explanation, owing to being configured to the signal that produces and reverse by the position, rising edge of each BK signal as filament drive singal Ef (filament driving clock frequency F_CLK), though therefore the marginal position of filament drive singal Ef is not unanimously to the beginning sequential of anode shinny period, but produce the signal reversed by the position, drop edge of each BK signal and drive clock frequency F_CLK as filament, and obtain making its marginal position be unanimously to the filament drive singal Ef of the beginning sequential of anode shinny period, make, by the luminance difference of each scanning, there is systematicness similarly, and can reach discover less than display flicker.

At this, can understand with reference to Fig. 6, in order to prevent the more important person of display flicker, being the difference (mistiming) of the marginal position of the filament drive singal Ef of the beginning sequential relative to anode shinny period, is be fixing (also comprising poor=0 and be consistent situation) in each scan period.Namely, if the difference so making the marginal position of the filament drive singal Ef of the beginning sequential relative to anode shinny period is fixing in each scan period, then as shown in Fig. 6 or Fig. 1, what can make " during filament drive singal Ef is H level within anode shinny period " has systematicness (that is, the brightness decline by each scanning being set to " N "/" 0 ") by the difference of each scanning.

Or, also can become prevent as after the 3rd example illustrated by the difference person by each scanning of " during filament drive singal Ef becomes H level within anode shinny period ".

As described in order to reach " be fixing relative to being worse than in each scan period of marginal position of the filament drive singal Ef of the beginning sequential of anode shinny period ", as long as at least in the anode of the front of every one scan shinny period, make its difference starting the marginal position of sequential and filament drive singal Ef for fixing.

Owing to as filament drive singal Ef being the signal person producing the fixed cycle, as long as therefore make the difference of the marginal position of the beginning sequential of the front anode shinny period relative to every one scan be set to fixing in this manner, even if then about the anode A of each grid G after the grid G (grid G 1) of front, it also can be made to be set to fixing relative to the difference of the marginal position of the filament drive singal Ef of the beginning sequential of this anode shinny period by each scanning.

But, in described Fig. 6 (and Fig. 5), due to exemplified with the situation formation number of grid G being set to odd number, therefore become and by the pass of the waveform reversion of each scanning filament drive singal Ef be, and the anode A brightness slippage of the brightness slippage of the anode A of the grid G of odd-times and even-times grid G can be made whereby alternatively to become " N "/" 0 " by each scanning, as a result, display flicker can be prevented for whole anode A.

But, when the formation number of grid G is set to the situation of even number, waveform in each scan period filament drive singal Ef can become identical, and be accompanied by this, in each scan period, the brightness slippage of the anode A of the grid G of odd-times can be fixed as " N ", and the brightness slippage of the anode A of even-times grid G can be fixed as " 0 ", result, it is fuzzy to produce brightness between the anode A of the anode A being formed at the grid G of odd-times and the grid G being formed at even-times.That is, can become and cannot realize suitable brightness adjustment.

Therefore, when the formation number of grid G is set to even number, as long as by driving the BK signal of clock generation circuit 5 to insert dummy burst (dummypulse) for being input into filament, and make to become reversion person by the waveform of each scanning filament drive singal Ef.Specifically, as long as insert (odd number) dummy burst for BK signal by every one scan.

Moreover, in explanation up to the present, though have the controller 3 using hardware (hardware), and the BK signal that this controller 3 exports is set to the importer for filament driving clock generation circuit 5, but also can be configured to omit controller 3 with regard to VFD module.

Fig. 7 is the Inner Constitution that display eliminates the VFD module of the variation as the 2nd example of the controller 3 of hardware.

In this situation, the function that controller 3 has is by realizing CPU10 mounting software (software).The formation of omission controller 3 so is adopted as during CPU10 at the CPU that use arithmetic capability is higher.

In the formation shown in this Fig. 7, in described Fig. 4 and Fig. 2 from controller 3 export BK signal and GCP signal be become from CPU10, driver 4 to be exported.

Corresponding to this, the filament in this situation drives clock generation circuit 5, is that input has so from the BK signal that CPU10 exports, and carries out according to this BK signal the generation that filament drives clock frequency F_CLK1, F_CLK2.

Then, be described for the 3rd example.

3rd example is produced making this marginal position be synchronized with the signal showing the signal of the boundary of the adjustment width of anode shinny period by this marginal position as filament drive singal Ef.Specifically, by the signal that the marginal position of either party of the rise/fall for described GCP signal makes this marginal position synchronous, drive clock frequency F_CLK as filament and produced.

Fig. 8 is the figure of display as the Inner Constitution of the VFD module of the 3rd example.

In Fig. 8, the VFD module of the 3rd example is compared with the VFD module of the 2nd example shown in Fig. 4, difference is: input GCP signal by controller 3 and drive clock generation circuit 5 (the clock frequency terminal of reverser 5a) to filament, and be not BK signal.

Fig. 9 is the sequential chart of the generation filament driving clock frequency F_CLK of display the 3rd example.

In addition, in this Fig. 9, the waveform of clock frequency F_CLK1 and filament drive singal Ef is driven about the signal g1 of grid G 1, BK signal, filament, though the waveform between the selecting period of only mainly extracting grid G 1 out, but these each signals between the selecting period of grid G 1 after waveform be become this grid G 1 selecting period between the repetition of waveform.

First with regard to prerequisite, in this example, the gradient of brightness adjustment is set to 16bit, and correspond to this with regard to GCP signal, is if the figure umber of pulse be set between a grid selecting period is 14.

According to GCP signal so, from the marginal position with this GCP signal, select set marginal position, set the width (being even the width of anode shinny period) of the conduction period of anode signal a when briliancy adjusts whereby by set quantitative (gradient).

Can understand with reference to Fig. 8, drive clock generation circuit 5 with regard to filament now, also export the signal reversed by the position, rising edge of each input signal and drive clock frequency F_CLK as filament.Therefore, as shown in Figure 9, drive with regard to clock frequency F_CLK with regard to filament now, the signal reversed by the position, rising edge of each GCP signal can be obtained.

Moreover, be accompanied by this, as filament drive singal Ef, as figure also becomes the waveform person having and reverse by the position, rising edge of each GCP signal.

Figure 10 is the figure in order to effect during filament drive singal Ef for use the 3rd example.

In addition, in this Figure 10 also due to illustrated convenience, and G1 to G3 is only formed as grid G (that is, only having g1 to g3 as signal g) in the same manner as the situation of described Fig. 6.Moreover, also identical with described Fig. 6 in this situation, be set to and be only directed to anode A, and the anode signal a1 belonging to the drive singal of this anode A 1 be as legend be shown with select grid G 1 time=conducting, select grid G 2 time=conducting, select grid G 3 time=shutoff.

In this, when being directed to anode A (being the anode A 1 of grid G 1 and the anode A 1 of grid G 2 in this legend) that be set to shinny object, can understand in the anode of these anode A shinny period, sequential is started for this, the position, rising edge of filament drive singal Ef is consistent, and for end sequential, the position, drop edge of filament drive singal Ef is consistent.This to be the GCP signal in generation source owing to becoming filament drive singal Ef be as described in the signal of width of the conduction period in order to set anode signal a.

Can understand thus, " filament drive singal Ef becomes the length during H level within anode shinny period " by the 3rd example, in whole scan period, about whole anode A, can be made to be fixing.Namely, about whole anode A, can prevent the difference (preventing the difference of the brightness of each scanning itself completely) of each scanning of " filament drive singal Ef becomes the length during H level within anode shinny period " completely, result, can prevent display flicker.

In addition, according to the 3rd example, even if also mean for the scan period of grid is set to lower situation (such as 60Hz etc.), display also can be made to glimmer and to be not easy to be discovered.

Therefore, in described, owing to using, the umber of pulse between each grid selecting period is set to the signal of even number (14) as GCP signal, therefore the umber of pulse between a grid selecting period of filament drive singal Ef also becomes even number, and the waveform being accompanied by this filament drive singal Ef between each grid selecting period becomes identical, result, though prevent the difference of each scanning of " filament drive singal Ef becomes the length during H level within anode shinny period " completely as Figure 10 is made, but with regard to the 3rd example, also according to identical the considering of situation with described 2nd example, and make the umber of pulse of the filament drive singal Ef between each grid selecting period is set to odd number, and by the waveform of the filament drive singal Ef that reverses between each grid selecting period, whereby, also the difference of the brightness of each scanning can be made to have systematicness and make display flicker be not easy to discover.

Figure 10 illustrates to have umber of pulse between the selecting period producing each grid when becoming the filament drive singal Ef of odd number, the formation of the filament driving clock generation circuit 11 that should possess.

With regard to become the gimmick of the filament drive singal Ef of odd number in order to the umber of pulse produced between each lattice selecting period with regard to, the gimmick of the logical "or" (OR) taking GCP signal and BK signal of can illustrating.

Corresponding to this gimmick, shown filament should be schemed and drive clock generation circuit 11, be as figure includes the OR grid circuit 11a inputting GCP signal and BK signal, and include the reverser 5a output of this OR grid circuit 11a being inputed to clock frequency terminal.

Figure 12 is the figure that the filament in order to drive clock generation circuit 11 to produce for filament as shown in Figure 11 drives clock frequency F_CLK to be described.

In addition, in this Figure 12, also show the waveform of signal g1, BK signal, GCP signal in the lump.

In this situation in this example, be as figure use this decline sequential to become than a grid selecting period between the signal in beginning sequential front a little as BK signal.

Can understand with reference to this Figure 12, if the logical "or" be made for according to GCP and BK signal drives clock frequency F_CLK person to produce filament, then drive with regard to clock frequency F_CLK1 with regard to this filament, be that the umber of pulse in the grid selecting period as figure becomes odd number, and obtain the signal by its waveform reversion between each grid selecting period.

If use filament so to drive clock frequency F_CLK1, then by the waveform reversion by filament drive singal Ef between each grid selecting period, and identically with the situation of described Fig. 6, become " having " during making the filament drive singal Ef in the anode of the anode A of the grid G in odd-times shinny period become H level, and during the filament drive singal Ef of the anode of the anode A of the grid G of even-times shinny period becomes H level, become "None" etc., then can give set " bright " for the brightness of the anode A of the grid G of the brightness of the anode A of the grid G of odd-times and even-times, " secretly ".

And, if now also make the formation number of grid G be odd number, " bright ", " secretly " relation of the brightness of the grid G of odd-times so and the grid G of even-times then can be made to reverse by scanning at every turn, result, in the same manner as the situation of the 2nd example, the difference of the brightness of each scanning can be made to have systematicness.That is, result can prevent from perceiving display flicker.

In addition, now when the formation number of grid G is set to even number, identical with the situation of the 2nd example, as long as by inserting the dummy burst relative to every one scan of BK signal, and carry out adjusting in the mode that the waveform of filament drive singal Ef reverses by every one scan.

But can understand with reference to described Figure 10 etc., the GCP signal used at the 3rd example is the signal that frequency is higher compared with signal g and anode signal a.

So the more high-frequency signal of foundation and produce filament drive singal Ef the 3rd example for, therefore, and expend to have compared with the loss and the 1st of electric power, the 2nd example and become large tendency.Specifically, the loss expending electric power becomes large according to the 1st example < the 2nd example < the 3rd example.

To this in other words, also mean that the loss that can make to expend according to the order of the 3rd, the 2nd, the 1st example electric power reduces, therefore with regard to delete expend electric power aspect with regard to, the 1st example producing the minimum filament drive singal Ef of frequency is the most favourable.

In addition, as described in the 2nd example variation illustrated by, also have the situation omitting the controller 3 exporting BK signal and GCP signal.

Though Figure 13 shows the figure of the Inner Constitution of the VFD module of the variation of the 3rd example as the controller 3 eliminating hardware, but now, also become by software to the function that CPU10 mount controller 3 has, BK signal and GCP signal export from this CPU10 driver 4.

Corresponding to this, the filament in this situation drives clock generation circuit 5 to be as figure input has the GCP signal exported from CPU10, and carries out according to this GCP signal the generation that filament drives clock frequency F_CLK1, F_CLK2.

< 4. variation >

Though enter shape for each example of the present invention above to illustrate, but the present invention is not by the hereto illustrated concrete example person of restriction.

Such as with regard in explanation hereto, in time exchanging driving filament 1a, though be set as the commutation circuit defining and be made up of changeover module Q1 to Q4, but the interchange of filament 1a driving also can such as be realized by the formation shown in Figure 14.

In the formation shown in Figure 14, being be formed when producing filament drive singal (driving voltage) Ef, driving clock frequency F_CLK1 according to filament and being carried out the DC/DC converter of switching action by the commutation circuit of primary side.Specifically, be input side capacitor (condenser) Ci, the changeover module Q5 had in figure, transformer TR, commutation diode Do1, commutation diode Do2, outgoing side capacitor Co1, outgoing side capacitor Co2 and the DC/DC converter of diode ZD received in season.

In this DC/DC converter, input side capacitor Ci is that its positive terminal is connected with input voltage Vcc, and negative terminal is as being illustrated as ground connection.Further, between the tie point of this input side capacitor Ci and input voltage Vcc and ground connection (earth), be the series-connection circuit being inserted with a coiling N1 that transformer TR has and changeover module Q5.

Changeover module Q5 is made for NchMOS-FET, and its drain electrode is connected with a coiling N1, and source electrode is ground connection.

If the grid being illustrated in changeover module Q5 gives filament to drive clock frequency F_CLK1, and be that flowing has and drives clock frequency F_CLK according to this filament and the primary side current that switched in coiling N1 whereby.

In transformer TR, in response to having described primary side current in a coiling N1 flowing, alternating voltage is produced for the coiling being wound in its secondary side.

Now, the secondary side for transformer TR is as diagram is wound with secondary coiling N2 and secondary coiling N'.

Be formed with the first rectifier smoothing circuit be made up of commutation diode Do1 and outgoing side capacitor Co1 for secondary coiling N2, and the second rectifier smoothing circuit be made up of commutation diode Do2 and outgoing side capacitor Co2.

Specifically, secondary coiling N2 is the anode that one square end portion is connected to commutation diode Do1, and the opposing party end is ground connection.The negative electrode of commutation diode Do1 is the positive terminal being connected to outgoing side capacitor Co1, and the negative terminal of this outgoing side capacitor Co1 is ground connection.

Moreover being bestowed intermediate tap (tap) in secondary coiling N2, is the anode being connected with commutation diode Do2 for this intermediate tap.Further, the negative electrode of commutation diode Do2 is connected with the positive terminal of outgoing side capacitor Co2, and the negative terminal of this outgoing side capacitor Co2 is ground connection.

Accordingly, if the winding section of end to described intermediate tap of the one from secondary coiling N2 is set to the first winding section, and residual winding section is set to the second winding section, then described first rectifier smoothing circuit carries out the rectification smooth motion according to the alternating voltage resulting from described first winding section, and produce the first VD in the two ends of smmothing capacitor Co1 whereby.This first VD is supplied to driver 4 as anode voltage VHA.

Moreover described second rectifier smoothing circuit carries out the rectification smooth motion according to the alternating voltage resulting from described second winding section, and produce the second VD in the two ends of smmothing capacitor Co2 whereby.This second VD is supplied to driver 4 as grid voltage VHG.

Moreover secondary coiling N2' is the end that the end of one side is connected to a side of the filament 1a being formed at VFD1 inside, and the opposing party end is the end of the opposing party being connected to this filament 1a.

Also be applied with intermediate tap as this secondary coiling N2', this intermediate tap is if diagram is via receiving diode ZD (negative electrode → anode) and ground connection season.In addition, the effect of diode ZD received in season is identical with person illustrated by described 1st example.

By formation so, by driving filament 1a in response to driving the cycle of clock frequency F_CLK1 to exchange in filament.Specifically, during filament drives clock frequency F_CLK1 to become H level, the electric current (clockwise direction electric current: corresponding to " Ef+ " in figure) flowed toward the end side of one from the end side of described the opposing party can be flowed for filament 1a in secondary coiling N2', and on the other hand, drive during clock frequency F_CLK1 becomes L level at filament, the electric current (reverse direction electric current: corresponding to " Ef-" in figure) flowed can be flowed for filament 1a in secondary coiling N2' from the end side of one toward the end side of described the opposing party.

Accordingly, though described illustrated DC/DC converter becomes the power circuit person forming VFD module, but according to the formation of the DC/DC converter shown in Figure 14, then have by common with the power circuit in order to produce anode voltage VHA and grid voltage VHG for the power circuit in order to produce filament drive singal Ef be the advantage of.

Claims

1. a Vacuume fluorescent display module, comprising:

Fluorescent display tube, comprises anode, grid, filament;

Filament drive signal generation circuit, produce filament drive singal, described filament drive singal is the marginal position by each side by rising or in position, drop edge, show and sequentially select the marginal position of the one of the selection grid switching cycle signal of the switching cycle of described grid and the signal that reverses, and for each scan period that is worse than of its marginal position of the beginning sequential relative to the anode of front shinny period of the front of each scan period of being arranged in described grid be fixing signal; And

Filament driving circuit, drives described filament according to described filament drive singal;

Described anode shinny period is during signal and anode signal become conducting simultaneously;

The quantity of described grid establishes even number;

Described filament drive signal generation circuit is the dummy burst by inserting relative to described selection grid switching cycle signal, and results from the described filament drive singal that each scan period has odd number pulse.

2. a Vacuume fluorescent display module, comprising:

Fluorescent display tube, comprises anode, grid, filament;

Filament drive signal generation circuit, input the marginal position by the side risen or in position, drop edge, show the brightness width signal of the boundary of the adjustment width of anode shinny period, and the selection gate switching signal of the switching cycle sequentially selecting described grid is shown by the marginal position of the side risen or in position, drop edge, and according to these brightness width signal and the logical "or" selecting gate switching signal, the each scan period that is worse than producing its marginal position of the beginning sequential relative to the anode of front shinny period of the front of each scan period being arranged in described grid is fixing filament drive singal, and

Filament driving circuit, drives described filament according to described filament drive singal,

Described anode shinny period is during signal and anode signal become conducting simultaneously.

3. Vacuume fluorescent display module according to claim 1 and 2, is characterized in that, described filament driving circuit is the driving carrying out described filament by exchanging type of drive.

4. Vacuume fluorescent display module according to claim 3, it is characterized in that, described filament drive signal generation circuit is the alternating voltage that produces according to the secondary coiling of DC/DC converter and obtains described filament drive singal, this DC/DC converter is the signal be worse than for fixing in each scan period of its marginal position in response to the beginning sequential relative to the anode of described front shinny period, and its primary side commutation circuit carry out switching action person.

5. a driving method, is in order to drive the driving method of fluorescent display tube including anode, grid, filament, comprises:

Filament drive singal generating step, produce filament drive singal, described filament drive singal is the marginal position by each side by rising or in position, drop edge, show and sequentially select the marginal position of the one of the selection grid switching cycle signal of the switching cycle of described grid and the signal that reverses, and for each scan period that is worse than of its marginal position of the beginning sequential relative to the anode of front shinny period of the front of each scan period of being arranged in described grid be fixing signal; And

Filament actuation step, drives described filament according to described filament drive singal;

The quantity of described grid establishes even number;

Described filament drive singal generating step is the dummy burst by inserting relative to described selection grid switching cycle signal, and results from the described filament drive singal that each scan period has odd number pulse.

6. a driving method, is in order to drive the driving method of fluorescent display tube including anode, grid, filament, comprises:

Filament drive singal generating step, input the marginal position by the side risen or in position, drop edge, show the brightness width signal of the boundary of the adjustment width of anode shinny period, and the selection gate switching signal of the switching cycle sequentially selecting described grid is shown by the marginal position of the side risen or in position, drop edge, and according to these brightness width signal and the logical "or" selecting gate switching signal, the each scan period that is worse than producing its marginal position of the beginning sequential relative to the anode of front shinny period of the front of each scan period being arranged in described grid is fixing filament drive singal, and

Filament actuation step, drives described filament according to described filament drive singal,