KR100194371B1 - Vacuum fluorescent display with built-in driver - Google Patents

Abstract

PURPOSE: To provide a fluorescent display tube with a built-in driving part, which is excellent in functionality with few parts and manufacturing labor and small external dimensions.

Composition: The vacuum container 4 is composed of a substrate 2 and the container portion (3). In the center of the container inner surface 3a, there is a groove-like recess 7. On the substrate facing the concave portion, there is an anode 8 which is a light emitting display portion. Above the anode is a cathode 11 surrounded by a recess. The inner surface of the concave portion has a conductive film 12, and is given the same or negative potential as that of the cathode. On the inner surface of the substrate facing the inner surface of the container portion other than the recessed portion, there is an IC which is a driving portion. Electrons from the cathode surrounded by the concave portion are focused by the electric field action in which the conductive film in the concave portion is formed, and adolescents do not reach the IC and fall to the anode. Malfunction of the IC caused by dead stones of the electron beam is prevented.

Description

Fluorescent Display Tube with Built-in Drive

1 is a cross-sectional view of a first embodiment of the present invention;

2 is a cross-sectional view of a second embodiment of the present invention;

3 is a cross-sectional view of a conventional fluorescent lamp having a built-in drive unit.

* Explanation of symbols for main parts of the drawings

1, 10: Fluorescent display tube with driving part

2: substrate 3, 13: container portion

4, 41: vacuum container 7, 17: recess

11: cathode 12, 22: conductive film

13: IC as a drive part

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fluorescent display tube with a built-in drive unit including a drive unit such as an IC in a vacuum container.

[Prior art]

In a fluorescent light emitting tube with a built-in drive unit including an IC as a drive unit in a vacuum container, electrons emitted from a cathode of a filament, ultraviolet rays or visible light incident from an outside of the vacuum container may enter the IC and malfunction.

Therefore, in order to prevent such a break, the fluorescent display tube of this type has a structure in which the entirety of the IC 101 is covered with the metal shield member 102 inside the vacuum vessel 100 as shown in FIG. We adopt

[Problem to Solve Invention]

Conventional drive unit built-in fluorescent display tube had the following problems.

(1) A metal shield member having a size to cover the entire IC is required, and the number of parts increases. In particular, in the case of fluorescent display tubes that require a large number of drive ICs, such as static drive fluorescent printer heads, the number of components of the shield member is very large in conventional IC built-in structures.

(2) When the metal shield member is coated on the IC bonded with the wire on the substrate, the shield member and the wire must not be in contact. Conventional IC-embedded fluorescent display tubes require a complicated process of attaching the shield member while paying attention to avoid closing by such electrical contact.

(3) It is necessary to allow a margin in the dimensions (width direction and height direction) of the shield member so that the metal shield member and the wire do not come into contact with each other. The outer dimension of the pipe becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display tube with a built-in driving unit having a low possibility of having a small number of parts, a small number of labors in manufacturing, and a small external dimension.

[Means for solving the problem]

A display part built-in fluorescent display tube according to claim 1 includes a drive part built-in display tube having a positive electrode having a phosphor in a vacuum container, a cathode having a filament, and a driving part for selectively emitting the positive electrode, wherein the vacuum container has a concave portion at an inner surface thereof. A substrate facing the container portion, wherein at least one or more filamentary cathodes are disposed in the recessed portion of the container portion, and the drive portion is disposed in the substrate yarn facing the inner surface of the container portion other than the recessed portion. It is done.

In the fluorescent light emitting tube with a built-in drive part of Claim 2, in the fluorescent substance built-in fluorescent tube with a drive part of Claim 1, the electrically conductive film is formed in the at least inner surface of the recessed part in the said container part.

As for the drive part built-in fluorescent display tube of Claim 3, in the drive part built-in fluorescent display tube of Claim 2, the said conductive film is translucent.

The driver built-in fluorescent display tube according to claim 4 is the driver built-in fluorescent display tube according to claim 2, wherein the conductive film is non-transmissive, and the light emission of the anode is observed through the substrate.

The driver built-in fluorescent display tube according to claim 5 is the driver built-in fluorescent display tube according to claim 1 or 2 or 3 or 4, wherein the container portion having the recess is provided on the front plate facing the substrate and around the front plate. It is an assembly container part which consists of a shield member which forms a board and a recessed part.

The drive part built-in fluorescent display tube according to claim 6 is the drive part built-in fluorescent display tube according to claim 1 or 2 or 3 or 4, wherein the container portion having the recess is formed integrally with glass.

[Action]

The conductive film formed on the inner surface of the recess converges electrons emitted from the cathode surrounded by the recess. Electron beams do not enter the drive unit disposed at the position on the substrate spaced apart from the recess.

EXAMPLE

A first embodiment of the present invention will be described with reference to FIG.

In the present embodiment, the drive part built-in fluorescent display tube 1 (hereinafter referred to as fluorescent display tube 1) has a thin box-shaped vacuum container 4 formed of a substrate 2 and a container portion 3. 1 is a cross-sectional view of the vacuum container 4 cut in a plane perpendicular to the longitudinal direction thereof. The container part 3 in this embodiment is a lid-shaped member in which the face plate part 5 and the side part 6 are integrated, and is composed of a light-transmitting insulating material such as glass together with the substrate 2. . The fluorescent display tube 1 of this embodiment is a structured fluorescent display tube that observes the display portion in the vacuum vessel 4 through the substrate 2.

A recess 7 is formed on the inner surface of the face plate portion 5 of the container portion 3. The concave portion 7 has a continuous shape of a continuous groove along the longitudinal direction of the vacuum vessel 4. Since the recessed part 7 is formed in the inner surface of the container part 3 which faces the board | substrate 2, the height in the vacuum container 4 is high in the recessed part 7, and the other part is made low.

An anode 8 is formed on the inner surface of the substrate 2 facing the recess 7. The anode 8 is composed of the anode conductor 9 provided on the substrate 2 and the phosphor layer 10 provided on the anode conductor 9. The anode 8 of the present embodiment is formed along the longitudinal direction of the vacuum vessel 4, that is, along the longitudinal direction of the recess 7.

At least one filamentary cathode 11 is provided on the anode 8. In the embodiment of FIG. 1, one cathode is formed in the shape of the anode, but two or more cases may be formed depending on the pattern of the anode. The cathode 11 is provided along the longitudinal direction of the vacuum vessel 4, that is, along the longitudinal direction of the recess 7. The cathode 11 is in a state surrounded by the recess 7. That is, the cathode 11 is in a virtual plane in which the inner surface 3a of the container portion 3 surrounding the recess 7 is included, or the recess on the side opposite to the anode 8 with respect to the same virtual plane. It is in (7). Although it is in the said virtual plane in FIG. 1, of course, it may be in the recessed part 7 (namely, above the said virtual plane).

A conductive film 12 is formed on the inner surface 7a of the recess 7. Since the fluorescent display tube 1 of this embodiment is a type for observing the display portion inside the tube through the substrate 2, the conductive film 12 of this embodiment is a transmissive conductive film such as an ITO film or a non-transmissive graphite. A conductive film may be sufficient. The conductive film 12 is provided with the cathode 11 and the coin or negative potential. Electrons emitted from the cathode 11 by the electric field of the conductive film 12 are focused and directed only to the anode 8 on the substrate 2. In addition, the inner surface of the container portion 3 (that is, the inner surface 7a of the recessed portion 7) facing the anode 8, which is the display portion, is shielded from the electrons, and electrons are difficult to accumulate.

IC 13 as a drive part is provided in the inner surface of the said board | substrate 2 which faces the inner surface 3a of the container part 3 other than the said recessed part 7. The IC 13 drives the anode 8 and the cathode 11 or an electrode such as a control electrode, although not shown. The IC 13 is connected to a terminal (not shown) on the substrate 2 by a bonding wire 14.

In the above configuration, when the fluorescent display tube 1 is driven, electrons emitted from the cathode 11 surrounded by the recess 7 are separated from the electric field generated by the conductive film 12 formed on the inner surface of the recess 7. It is influenced and connected as shown by the arrow in the figure, and it becomes a dead stone to the anode 8. The bonding wires 14 of the IC 13 to the IC 13, which are spaced apart from the recess 7 and are disposed in the narrow portion of the inner surface 3a of the container portion 3 and the substrate 2, are described above. An electron beam does not enter, and therefore, the IC 13 does not malfunction by the influence of electrons. When the position of the cathode 11 is completely inside the recessed portion 7, the effect of the electric field by the conductive film 13 on the electron beam is further increased.

In addition, in the present embodiment, since the conductive film 12 is also provided on the inner surface 3a of the container part 3 other than the recessed part 7, electrons accumulated in the container part 3 are stored in the IC 13, the electrode, or the like. The impact can reduce the tendency.

Also, as shown in FIG. 1 and FIG. 3, even if the thicknesses of the vacuum vessels 4 and 100 in the prior art and the present embodiment are equal to D, the container part 3 facing the IC 13 according to the present embodiment. ) Glass thickness d1 is larger than the thickness d2 of the conventional container portion 3. For this reason, the pressure resistant strength of the vacuum vessel 4 is greater in the fluorescent display tube 1 of this embodiment.

A second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals as those in FIG. 1 for simplicity of explanation, and the description thereof is omitted.

In the fluorescent display tube 10 of this embodiment, the structure of the vacuum container 14 is different from that of the first embodiment. The container part 13 of this embodiment is comprised from the front plate 15 facing the board | substrate 2, and the side plate 16 assembled in frame shape in the outer periphery of the front plate 15. As shown in FIG. 2 is a cross-sectional view of the vacuum vessel 14 cut in a plane perpendicular to the longitudinal direction thereof. The fluorescent display tube 10 of this embodiment is a fluorescent display tube having a structure of observing light emission of the phosphor layer 10 through the translucent front plate 15. Therefore, at least the front plate 15 needs light transmittance. As in the first embodiment, the container portion 13 is made of a light-transmitting insulating material such as glass together with the substrate 2.

On the inner surface of the container part 13 front plate 15, a pair of shield members 20 and 20 are attached to fixing means such as crystallized glass at predetermined intervals. The shield member 20 of this embodiment is made of glass and is a thin plate-shaped member along the longitudinal direction of the vacuum vessel 14. The space created between the pair of shield members 20 and 20 is a recess 17 provided on the inner surface of the container portion 13.

The positional relationship between the cathode 11, the anode 18, and the IC 13 in the present embodiment and the concave portion is the same as that in the first embodiment. However, the anode conductor 19 of this embodiment may be non-translucent, such as graphite. In addition, although two anodes 11 are provided, two or more anodes may be used depending on the pattern shape of an anode.

A conductive film 22 is formed on the inner surface 17a of the concave portion 17 and the inner surface 20a of the shield member 20. Since the present embodiment has a structure observed from the front plate 15 side, the conductive film 22 must be transparent. In this embodiment, the conductive film 22 is formed of a light transmissive thin film such as ITO. The conductive film 22 is provided with the cathode 11 and a coin potential or negative potential. The function is substantially the same as that of the conductive film 12 of the first embodiment, and electrons are concentrated under the influence of the electric field by the conductive film 22, making it difficult to enter the IC 13. In addition, since the conductive film 22 is also present on the inner surface 20a of the shield member 20 that the IC 13 faces, the IC 13 is also less likely to be adversely affected by the accumulation of electrons.

In the present embodiment, when the shield member 20 is made of metal, it is not necessary to separately form the conductive film 22 in this portion, but only to connect with the conductive film 22 in the recess 17. The container part 13 of this embodiment can be comprised easily only by combining a plate-shaped glass member. The mold for shaping as in the case of manufacturing the container portion 3 of the first embodiment is unnecessary. In addition, the present embodiment can be changed to the type observed through the front plate or the type observed through the substrate 2 as in the first embodiment.

[Effects of the Invention]

According to the fluorescent display tube with a built-in drive part of the present invention, since the cathode is disposed in the recess provided on the inner surface of the container, and the conductive film is provided in the recess, electrons from the cathode are focused and bound to the anode. Therefore, malfunction of a drive unit such as an IC due to the incident of the electron beam is reliably prevented. Moreover, the shield member which covered the drive part conventionally is unnecessary, and the number of parts was reduced.

In particular, when the container portion is integrated as in the first embodiment, the number of parts is further reduced.

The complicated process of covering the shield member for each driving section is omitted, and the number of steps is reduced.

In order to avoid contact with the bonding wire, the shield member, which has been made larger, is no longer needed, so that the external dimension of the vacuum container can be made smaller than before.

Parts other than the recessed portion, that is, the portion facing the driving portion of the container portion are thickened, so that the pressure resistance strength of the vacuum vessel is increased.

Claims (6)

In a fluorescent display tube with a built-in drive unit having a positive electrode having a phosphor in a vacuum vessel, a cathode having a filament, and a drive unit for selectively emitting the positive electrode, the vacuum container includes a container portion having a recess in the inner surface thereof and a substrate facing the container portion. And at least one filamentary cathode is disposed in the recessed portion of the container, and the drive portion is disposed on the substrate facing an inner surface of the container portion other than the recessed portion. A fluorescent light emitting tube with a built-in drive unit according to claim 1, wherein a conductive film is formed on at least an inner surface of the concave portion in the container portion. 3. The fluorescent display tube with a built-in driver of claim 2, wherein the conductive film is light transmissive. 3. The fluorescent display tube with a built-in driver of claim 2, wherein the conductive film is non-transmissive and the light emission of the anode is observed through a substrate. The shield member according to claim 1 or 2 or 3 or 4, wherein the container portion having the recess portion forms a front plate facing the substrate, a side plate provided around the front plate, and a recess portion. The drive unit built-in fluorescent display tube, characterized in that the assembly container configured. 5. The fluorescent display tube with a built-in drive unit according to claim 1, 2, 3, or 4, wherein the container portion having the concave portion is formed integrally with glass.