KR0165933B1 - Driving method and its tube for double side luminescence type fluorescent character display tube - Google Patents

Abstract

Purpose: The driving power system improves the luminance difference between the two display portions in a common double-sided fluorescence display tube.

Composition: On the inner surface of the front plate of the envelope of the double-sided fluorescent display tube, there is a first anode serving as the front plate side display portion.

In the vicinity of the first anode there is a first control electrode.

On the inner surface of the rear plate there is a second anode serving as the rear plate side display portion.

In the vicinity of the second anode there is a second control electrode.

In the middle of both control electrodes is the cathode.

(a) The first and second control electrodes are sequentially scanned by a common control electrode signal (voltage Ec) by a common power source.

The first and second anodes receive a positive signal in synchronization with the scanning of the positive control electrode.

The voltages of the positive signal of both anodes are common to Eb.

The ON time of the anode signal applied to the second anode is a, and the ON time of the anode signal provided to the first anode is b, which is a multiple of a.

The first anode emits light twice as long as the second anode.

(b) Since the conventional luminance of the first anode is about half of that of the second anode, the luminance of the display on the anode is approximately the same.

Description

Driving Method of Double-sided Fluorescent Display Tube and Double-sided Fluorescent Display Tube

1A is a drive timing diagram of a double-sided fluorescent display tube of the first embodiment.

1b is a diagram showing the effect.

2 is a cross-sectional view of a double-sided light emitting fluorescent display tube of the first embodiment.

* Explanation of symbols for main parts of the drawings

1: double-sided fluorescent display tube 2: external enclosure

3: front panel 4: rear panel

7: first anode as front panel side display portion 8: first control electrode

14 second electrode as back plate side display portion 16 second control electrode

17: cathode

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided light emitting fluorescent display tube having a display portion on an inner surface of a front plate and an inner surface of a rear plate, and observing light emission displays of both display portions through a front plate, and a driving method thereof.

[Prior art]

The double-sided luminescent fluorescent display tube has an envelope having a front plate and a back plate facing each other, and each has a display unit which is an anode having phosphors on each inner surface of the envelope and the rear plate. The light emission display in both display sections is observed outside the envelope through the transparent front plate.

[Problem to Solve Invention]

In the double-sided light-emitting fluorescent display tube, light emission of the display portion on the front plate side passes through the fluorescent substance of the display portion, the transmissive anode conductor, and the transmissive front plate to reach the observer's eye outside the envelope. On the other hand, light emission of the rear panel side display part is immediately observed when passing through the front panel.

Therefore, when the luminance of the phosphor is the same, the observed luminance of the front panel side display part is only about half of the observed luminance of the rear plate side display part, and there is a big problem in terms of display quality or appearance.

It is considered that if the driving power meters of both display sections are divided and the driving voltage of the front panel display section is larger than that of the rear panel display, the difference in luminance of both display sections can be improved. However, in the conventional double-sided fluorescent display tube, both display units are driven by a common single power source. Dividing the power supply system into two systems so as to drive both display units separately with separate driving voltages can cause a significant cost increase and thus cannot be employed.

SUMMARY OF THE INVENTION The present invention solves the conventional problems described above, and aims to improve the luminance difference between the two display portions in a double-sided fluorescent display tube with the power supply system in common.

[Means for solving the problem]

According to a first aspect of the present invention, there is provided a method of driving a double-sided light-emitting fluorescent display tube including a front envelope and a rear plate, a first envelope disposed on an inner surface of the front plate, and a second anode provided on an inner surface of the rear plate; And a first control electrode provided near the first anode, a second control electrode provided near the second anode, and a cathode provided between the first control electrode and the second control electrode. A driving method of a double-sided light emitting fluorescent display tube which observes a display on a display and a second anode through a front plate, wherein the brightness of the display by the first anode is the same as the brightness of the display by the second anode. It is characterized in that the application time of the anode signal applied to the first anode is made longer than the application time of the anode signal applied to the second anode such that.

According to a second aspect of the present invention, there is provided a method of driving a double-sided light-emitting fluorescent display tube comprising: an envelope having a front plate and a back plate, a first anode provided on an inner surface of the front plate, and a second anode provided on an inner surface of the back plate. And a first control electrode provided in the vicinity of the first anode, a second control electrode provided in the vicinity of the second anode, and a cathode provided between the first control electrode and the second control electrode. A method of driving a double-sided light emitting fluorescent display tube in which the display of the display and the display at the second anode are observed through a front plate, wherein the first and second control electrodes are successively scanned with a common power source and the The respective anodes are driven by a common power source so that the application time of the anode signal applied to the first anode is longer than the application time of the anode signal applied to the second anode.

According to a third aspect of the present invention, there is provided a method of driving a double-sided light-emitting fluorescent display tube according to the second aspect of the present invention, wherein the display is driven by the first anode and the second anode is driven. The application time of the anode signal applied to the first anode is made longer than the application time of the anode signal applied to the second anode so that the luminance of the display by the same is about the same.

In a method of driving a double-sided light-emitting fluorescent display tube according to a fourth aspect of the present invention, in the method of driving a double-sided light-emitting fluorescent display tube according to a second aspect, each of the anode signals is a square wave. The ON time of the anode signal applied to the first anode is longer than the ON time of the anode signal applied to the second anode.

The double-sided light emitting fluorescent display tube according to the fifth aspect of the present invention includes an enclosure having a front plate and a back plate, a first anode provided on an inner surface of the front plate, a second anode provided on an inner surface of the back plate, and A first control electrode provided in the vicinity of the first anode, a second control electrode provided in the vicinity of the second anode, and a cathode provided between the first control electrode and the second control electrode; A double-sided light emitting fluorescent display tube for observing a display on a second anode through a front plate, comprising: a control electrode driver for sequentially scanning the first and second control electrodes with a common power source and a first electrode; A cathode driving portion for driving the anodes with a common power source is provided so that the application time of the anode signal to be applied is longer than the application time of the anode signal to the second anode.

[Action]

The first and second control electrodes are successively scanned with a common power source. In synchronization with the scanning of both control electrodes, the first and second anodes are driven by a common power source. At that time, the application time of the anode signal applied to the first anode is made longer than the application time of the anode signal applied to the second anode. The display in the first anode and the display in the second anode have the same luminance.

EXAMPLE

A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The double-sided luminescent fluorescent display tube 1 of this embodiment shown in FIG. 2 has a box-like envelope 2 in which the inside thereof is in a high vacuum state. The envelope 2 has a translucent front plate 3 and a back plate 4 facing the front plate 3 at a predetermined interval. Although not shown, the periphery of the front plate 3 and the back plate 4 is sealed through a spacer.

On the inner surface of the front plate 3, a first positive electrode 7 made of a transparent anode conductor 5 and a phosphor layer 6 deposited on the anode conductor 5 is provided as a front plate side display portion.

The first control electrode 8 is provided in the vicinity of the first anode 7 at a predetermined distance from the first anode 7. The first control electrode 8 is divided into a plurality of electrically divided control electrodes, and is configured to scan sequentially and continuously.

On the inner surface of the back plate 4, a wiring conductor 9 is provided. On the wiring conductor 9, an insulating layer 10 serving as a light shielding material is deposited. Through holes 11 are formed in portions of the insulating layer 10 that correspond to the wiring conductors 9. On the insulating layer 10, a second anode 14 made of a positive electrode conductor 12 and a phosphor layer 13 deposited on the positive electrode conductor 12 is provided as a rear plate side display portion. The anode conductor 12 of the second anode 14 is connected to the wiring conductor 9 via a conductive material 15 filled in the through hole 11.

A second control electrode 16 is provided near the second anode 14 at a predetermined interval from the second anode 14. The second control electrode 16 is divided into a plurality of electrically divided control electrodes, and is configured to sequentially scan continuously following the scanning of the first control electrode 8.

In the enclosure 2, a filamentary cathode 17 serving as an electron source is provided at an intermediate position between the first control electrode 8 and the second control electrode 16. In the double-sided light-emitting fluorescent display tube 1, since there are two display sections in the enclosure 2, there is no room in the electrode placement space. Thus, when the cathode 17 is disposed in the middle of both control electrodes 8 and 16 as in the present embodiment, it is not easy to contact either control electrode when the cathode 17 vibrates.

The drive circuit of the double-sided luminescent fluorescent display tube 1 has a control electrode driver for continuously circulating and scanning the first and second control electrodes 8 and 16 with a common power source. As described above, when both control electrodes 8 and 16 are sequentially scanned, and only one of the first and second anodes 7 and 14 emits light, electrons emitted from the cathode 17 should emit light. Since it is directed only to the anode, even if the cathode 17 of the electron source is made common between the anodes 7, 14, sufficient luminance is obtained and the lifetime of the cathode 17 is also long.

In addition, the driving circuit of the double-sided light-emitting fluorescent display tube 1 is a positive electrode for driving the first positive electrode 7 and the second positive electrode 14 with a common power supply in synchronization with the scanning of the control electrodes 8 and 16. It has a driving part. The anode driver drives the anodes 7 and 14 such that the application time of the anode signal applied to the first anode 7 is twice the application time of the anode signal applied to the second anode 14. The application time of the anode signal applied to the first and second anodes 7 and 14 can be arbitrarily set and changed by a program set in the drive element constituting the anode driver.

The driving of the double-sided luminescence fluorescent display tube 1 of this embodiment will be described. The first and second control electrodes 8, 16 are sequentially scanned in series by a common control electrode signal (voltage Ec) which is a square wave as shown in FIG. 1A.

The first positive electrode 7 and the second positive electrode 14 are supplied with a positive signal of a square wave as a display signal in synchronization with the scanning of the positive control electrodes 8 and 16. The voltages of the anode signals applied to both anodes 7, 14 are common to Eb. Here, as shown in FIG. 1A, the ON time of the anode signal applied to the second anode 14, which is the display portion on the rear plate 4 side, is a. However, the positive signal given to the first positive electrode 7 which is the display portion on the front plate 3 side is b whose ON time is double of a. That is, the first anode 7 is applied with a time driving signal twice as large as that of the second anode 14, so that the first anode 7 emits twice as much time as the second anode 14.

As shown in FIG. 1B, the conventional brightness of the first anode 7 is only about half that of the second anode 14, but according to the present embodiment, the second anode 14 is formed on the first anode 7 according to the present embodiment. Since the anode signal was given twice as long as), the luminance of the display on both anodes 7 and 14 became substantially the same.

Conventionally, the luminance of the first anode 7 is about half of the luminance of the second anode 14, and in the above embodiment, in order to improve this, the ON time of the anode signal applied to the first anode 7 is changed to the second anode. It doubled as (14). However, according to various conditions, the luminance difference of both the anodes in the prior art is not limited to only one example described above, and therefore the difference in the application time of the anode signal in the present invention is not limited to the above example.

The difference in the application time of the anode signal in the embodiment of the present invention can be arbitrarily set by appropriately changing the program set in the driver element constituting the anode driver.

[Effects of the Invention]

According to the present invention, since the application time of the display signal applied to the front panel side display part is longer than the application time of the display signal applied to the back panel side display part, the following effects can be obtained in the double-sided fluorescent display tube. .

(1) The luminance of the front panel display can be made higher than before.

(2) By increasing the luminance of the front panel side display unit than before, the luminance of the front panel side display unit and the rear panel side display unit can be matched, and the display quality can be improved.

③ Since the brightness of the front panel display is improved by adjusting the driving time, it is possible to achieve high practical effect with minimum economic burden without adopting the method of manufacturing cost that adopts two systems of positive driving power system. have.

Claims (4)

An outer enclosure having a front plate and a back plate, a first anode provided on an inner surface of the front plate, a second anode provided on an inner surface of the back plate, a first control electrode provided near the first anode, and a second anode. Double-sided light emission which has a 2nd control electrode provided in the vicinity, and the cathode provided between the 1st control electrode and the 2nd control electrode, and observes the display in a 1st anode, and the display in a 2nd positive electrode through a front plate. A method of driving a fluorescent display tube, wherein the application time of the anode signal applied to the first anode is applied to the second anode such that the brightness of the display by the first anode is the same as that of the display by the second anode. A method for driving a double-sided light-emitting fluorescent display tube, characterized in that it is longer than the application time of the anode signal applied to the signal. An outer enclosure having a front plate and a back plate, a first anode provided on an inner surface of the front plate, a second anode provided on an inner surface of the back plate, a first control electrode provided near the first anode, and a second anode. Double-sided light emission which has a 2nd control electrode provided in the vicinity, and the cathode provided between the 1st control electrode and the 2nd control electrode, and observes the display in a 1st anode, and the display in a 2nd positive electrode through a front plate. In the method of driving a fluorescent display tube, the first and second control electrodes are successively scanned with a common power source, and an application time of an anode signal applied to the first anode is applied to the second anode. And driving each of the anodes with a common power source so as to be longer than the application time of the anode signal. 3. The double-sided emission type fluorescence light emitting diode according to claim 2, wherein each of the anode signals is a square pie, and the ON time of the anode signal applied to the first anode is longer than the ON time of the anode signal applied to the second anode. Method of driving display tube. An outer enclosure having a front plate and a back plate, a first anode provided on an inner surface of the front plate, a second anode provided on an inner surface of the back plate, a first control electrode provided near the first anode, and a second anode. Double-sided light emission which has a 2nd control electrode provided in the vicinity, and the cathode provided between the 1st control electrode and the 2nd control electrode, and observes the display in a 1st anode, and the display in a 2nd positive electrode through a front plate. In the fluorescent display tube, a positive electrode signal in which a control electrode driver continuously scans the first and second control electrodes sequentially with a common power source and an application time of the positive signal applied to the first positive electrode is applied to the second positive electrode. And a cathode driving unit for driving each of the anodes with a common power source so as to be longer than the application time.