WO2002061793A1

WO2002061793A1 - Front side glass substrate for display and display device

Info

Publication number: WO2002061793A1
Application number: PCT/JP2002/000666
Authority: WO
Inventors: Yoshifumi Amano
Original assignee: Technology Trade And Transfer Corporation
Priority date: 2001-01-29
Filing date: 2002-01-29
Publication date: 2002-08-08
Also published as: EP1357575A1; KR20030004358A; CA2404826A1; JPWO2002061793A1

Abstract

A front side glass substrate for display tube, wherein a plurality of grooves (2) having a generally V-shaped same cross section and a generally flat head part are formed in one surface of a glass substrate (1) parallel with each other at specified intervals, and fluorescent body layers (3) are coated on the head parts and inner wall surfaces of the plurality of grooves (2), whereby the coated amount of fluorescent body in the grooves can be increased, the light beam of the fluorescent body emitted from the side faces of the grooves with increased amount of fluorescent body coated thereon can be radiated efficiently to a front side, and the brightness and luminous efficiency of the glass substrate can be increased.

Description

Light

Front side glass substrate for display tube and display device

Technical field

The present invention relates to a front glass substrate for a display tube, a flat discharge display, a low-speed electron beam fluorescent display, an electric field emission fluorescent display, and a cathode ray tube.

, A discharge light emitting device for illumination, a glass substrate for a flat discharge display device, a method for forming an electrode of a glass substrate for a flat discharge display device, a glass substrate for a flat discharge display device, and an electrode for a glass substrate for a flat discharge display device It relates to a forming method. Background art

In a flat-panel discharge display device called a 'PDP (Plasma Display Panel)', a phosphor is applied to the rear glass substrate and the ultraviolet light generated by the discharge from the electrodes on the front glass substrate is fluoresced. The mainstream is a flat-type discharge display device having a reflective phosphor screen that illuminates the body and emits the phosphor, but a transmissive phosphor screen in which the phosphor is applied to the front glass substrate side. There is also a flat-screen discharge display device having the following.

By the way, when comparing a flat discharge display device having a reflective phosphor screen with a flat discharge display device having a transmissive phosphor screen, the former shows that the phosphors are also applied to the partition walls forming the pixels. It was said that the light-emitting area was large and the brightness was high, whereas the latter was inferior in brightness to the former. Therefore, the front glass substrate according to the invention of the earlier application (Japanese Patent Application No. 11-164,292) filed by the same applicant and the same inventor as the present invention is, as shown in FIG. A groove 2 is formed directly on the side glass substrate 1 by a sandblast method or a chemical etching method, and a phosphor 3 is applied in the groove 2. According to this front-side glass substrate, the phosphor application area can be at least twice as large as that of the conventional front-side glass substrate, so that the effect of improving brightness was sufficient.

However, in the front-side glass substrate having such a structure, the cross-sectional shape of the groove greatly affects the emission luminance of the phosphor applied in the groove. No mention is made of the shape, and as is usually considered, the maximum amount of light emitted from the center of the groove when viewed from the front side, that is, from the top of the groove, which is the almost flat part of the groove Was considered desirable.

Therefore, the cross-sectional shape of the groove, as shown in FIG.

The width of the cross-sectional shape of 4 (also 14) is as close as possible to the width of the opening 12 (also 1 2) or, as shown in Figure 2B, the groove and its groove It was thought that it would be good if the inclination angle 16 of the side surface with the adjacent groove was large.

According to such conventional ideas, when trying to maximize the amount of light radiation at the center of the groove, the depth of the groove is limited even from the process, so the area of the side surface of the inner wall of the groove must be reduced. Could not. In addition, if the width of the top of the cross section of the groove is increased, the inclination angle 16 is necessarily reduced, so that the amount of light emitted from the side surface of the inner wall of the groove to the front is reduced. For the above reasons, it has been considered that there is naturally a limit to the improvement in luminance by the front glass substrate of this structure.

Furthermore, the conventional glass substrate with a groove on the front side has a problem that contrast is poor. Usually to increase contrast In general, a light absorbing layer is provided in a portion of the front glass substrate where the phosphor is not applied, that is, in a gap between pixels, that is, the gap is generally blackened. However, as is clear from FIG. 1, the gap between the adjacent grooves is a deep portion sandwiched between the phosphor-applied portions when viewed from the front side, so even if this portion is blackened, There was no effect of absorbing external light, and the effect of improving contrast was weak. In addition, the front glass substrate of this structure is not only a flat discharge display device, but also a cathode ray tube (CRT: Cathod Ray Tube) for applying a phosphor and emitting light, and a VFD (Vaccum Fluorescent Display). Therefore, similar conditions are required for the cross-sectional shape of the groove.

Next, with reference to FIG. 3, the structure of a conventional three-electrode surface-discharge-type AC-type flat-type discharge display device (PDP) having a reflective phosphor screen will be described. This three-electrode surface-discharge type AC flat-panel discharge display device has a front-side glass substrate (not shown) and a rear-side glass substrate 21 in which a periphery is sealed with a flat glass. After the following structures are housed and the inside of the tube is evacuated, the discharge gas (gas) such as helm, neon, argon, xenon, etc., or a mixture thereof is reduced to 0 t0 rr ~. It is constructed and sealed at a pressure of 400 torr. '

A plurality of address electrodes 27 each having the same width and extending in the vertical direction are formed on the rear glass substrate 21 at the same predetermined intervals. On the rear glass substrate 21 and the plurality of address electrodes 27, a dielectric layer 22 is formed by printing such as low-melting glass so as to cover them. Also, the back side glass substrate 2

A plurality of partition walls extending in parallel with each other, that is, a plurality of ribs 23 are formed on the dielectric layer 22 so as to sandwich the plurality of address electrodes 27 on the top of the dielectric layer 22. The walls of the ribs 23 facing each other and the A phosphor 24 is applied to the inner wall of the groove formed by the surface of the dielectric layer 2 on the electrode 27.

Then, a plurality of address electrodes 27 and a plurality of partition walls 23 of the rear glass substrate 21 which are not shown in FIG. Sustain electrodes (display electrodes) 28 and 29 are formed as flat-plate-shaped discharge electrodes of the same width in each pair. One of the pair of sustain electrodes 28 and 29 of each pair forms a XY matrix with the plurality of address electrodes 27. A dielectric layer 25 is formed on the front glass substrate and on each of the plurality of pairs of sustain electrodes 28 and 29 so as to cover them. The dielectric layer 25 is generally formed with a uniform thickness on the plane of each of a plurality of pairs of the sustain electrodes 28 and 29 without partitioning for each pixel. The surface of the dielectric layer 25 is further covered with a protective layer 26 such as Mg0.

The dielectric layer 25 covering a plurality of pairs of the sustain electrodes 28 and 29 of the flat-type discharge display device having such a structure is formed with a uniform thickness on the surface of the electrode that operates as a discharge electrode.

In such a flat discharge display device, a sustain electrode for main discharge is disposed on the front glass substrate side, so that the sustain electrode is formed transparent so as not to hinder light emission from the phosphor screen to the front. Need to do o

Further, a transmission type flat discharge display device having a structure in which the front side and the back side of the flat discharge display device of FIG.

In patent applications (Japanese Patent Application No. 11 _800235, Japanese Patent Application No. 11-1664292, etc.) of the same applicant and the same inventor as the present application Is to form a discharge space by forming a groove in the glass substrate, A transmission type flat discharge display device using this as a front glass substrate has also been proposed.

In the conventional flat-panel discharge display device shown in Fig. 3, the sustain electrodes 28 and 29 on the front glass substrate are required to be nearly transparent, which is a major problem in the process. Met. Also, much time is required for forming the partition walls, which is also a problem in the process.

On the other hand, attempts have been made to form a discharge space by forming grooves directly on the glass substrate by sandblasting or chemical etching.There is no suitable method for forming electrodes inside the force-formed grooves. For this reason, the conventional three-electrode surface-discharge type flat-panel discharge display electrode configuration cannot form an address electrode.

Thus, according to the present invention, it is possible to increase the amount of the phosphor applied in the groove, to efficiently emit the light emitted from the phosphor from the side surface of the inner wall of the groove to the front side, and to obtain the luminance and the luminous efficiency An object of the present invention is to propose a front-side glass substrate for a display tube and a flat-type discharge display device having improved display.

Another object of the present invention is to propose a front-side glass substrate for a display tube and a flat discharge display device capable of simultaneously improving brightness and contrast. Disclosure of the invention

According to the present invention, on one surface side of a glass substrate, a plurality of grooves having substantially the same V-shaped cross-sectional shape and having a substantially flat top are formed parallel to each other at regular intervals. This is a front glass substrate for a display tube in which a phosphor layer is formed on the top of the groove and on the inner wall surface.

According to the present invention, a plurality of grooves having substantially the same V-shaped cross-sectional shape and having a substantially flat top are provided on one surface side of a glass substrate at regular intervals. The phosphor layers are formed on the inner wall surfaces of the plurality of grooves, and the width of the substantially flat crown is less than half the width of the opening. A front glass substrate for a display tube in which the height to the top is larger than the width of the opening, and the gap width between the openings of adjacent grooves is smaller than half the width of the opening of the groove. . According to the present invention, a plurality of grooves having substantially the same V-shaped cross-sectional shape are formed at regular intervals in parallel on one surface side of a glass substrate, and an electrode layer is provided at the top of the plurality of grooves. This is a glass substrate for a flat-panel discharge display device, which is formed by attaching a phosphor layer on inner wall surfaces of a plurality of grooves and on an electrode layer.

According to the present invention, a paste-shaped conductive ink is applied to a plurality of substantially V-shaped grooves having the same cross-sectional shape formed in parallel at regular intervals on one surface side of a glass substrate. A puddle of conductive ink is formed at the top of the groove, and the paste-like conductive ink in the plurality of grooves is dried and a glass substrate is sandblasted. As a result, the conductive ink attached to the inner wall surfaces of the plurality of grooves is removed, and the strip-shaped conductive ink is left on the tops of the plurality of grooves, and the remaining strip-shaped conductive ink is removed. This is a method for forming an electrode on a glass substrate for a flat discharge display device, in which a conductive ink is sintered to form an electrode. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a part of a conventional front glass substrate. FIG. 2 is a cross-sectional view of a part of each type of glass substrate for comparison of the cross-sectional shape of a groove formed in the glass substrate. FIG. 3 is an exploded perspective view of a part of a conventional three-electrode surface discharge type flat discharge display device (PDP) having a reflective phosphor screen. FIG. 4 is a perspective view showing a part of an example of the front glass substrate according to the embodiment of the present invention. FIG. 5 shows the operation of the present invention. It is an expanded sectional view showing a part of example of a front side glass substrate of an embodiment. FIG. 6 is an enlarged cross-sectional view showing a part of an example of the front glass substrate according to the embodiment of the present invention. FIG. 7 is a cross-sectional view showing a part of another example of the front glass substrate according to the embodiment of the present invention. FIG. 8 is a cross-sectional view showing a part of another example of the front glass substrate of the embodiment of the present invention. FIG. 9 is a cross-sectional view showing a part of another example of the front glass substrate according to the embodiment of the present invention. FIG. 10 is an enlarged perspective view showing a part of an example of the flat discharge display (PDP) according to the embodiment of the present invention. FIG. 11 is an exploded cross-sectional view of a part of an example of the field emission fluorescent display device according to the embodiment of the present invention. FIG. 12 is a sectional view showing a part of an example of the cathode ray tube according to the embodiment of the present invention. FIG. 13 is an exploded perspective view showing a part of an example of the arc tube according to the embodiment of the present invention. FIG. 14 is a cross-sectional view showing a part of an example of a glass substrate for a flat discharge display device according to an embodiment of the present invention. FIG. 15 is a cross-sectional process diagram showing an example of a method for forming a glass substrate for a flat discharge display device according to an embodiment of the present invention. FIG. 16 is a cross-sectional view showing a part of another example of the glass substrate for a flat discharge display device according to the embodiment of the present invention. FIG. 17 is a sectional process view showing another example of a method for forming a glass substrate for a flat discharge display device according to an embodiment of the present invention. FIG. 18 is an exploded perspective view showing a part of another example of the flat discharge display (PDP) according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

First, with reference to FIG. 4, FIG. 5, and FIG. 6, a configuration of an example of a front glass substrate for a display device according to an embodiment of the present invention will be described. 4 and 5 are a perspective view and a cross-sectional view, respectively, of a part of the front glass substrate. FIG. 5 shows the state of light emission on the front glass substrate. FIG. 6 is an enlarged sectional view showing a part of FIG. is there.

Referring to FIG. 4, a plurality of grooves 2 having the same cross-sectional shape and arranged at regular intervals are formed in the transparent front glass substrate 1 in parallel with each other. The phosphor 3 is coated on the inner wall surfaces of the plurality of grooves 2. The phosphor 3 emits light when excited by ultraviolet rays generated by the discharge of a discharge electrode provided on a rear glass substrate (not shown) or an electron beam from an electron gun. Since the front glass substrate 1 is transparent, the light emitted from the phosphor 3 is applied to the observation side, that is, the front surface of the front glass substrate 1. -The cross-sectional shape of the groove 2 of the front glass substrate 1 in FIG. 4 can be an arc, a shape close to a rectangle, a V-shape, a U-shape, or the like.

The state of light emitted from the phosphor 3 in the groove 2 having any one of these cross-sectional shapes will be described with reference to FIG. 5 and FIG. As shown in FIGS. 5 and 6, of the light from the phosphor 3, for example, the light from the light-emitting point 30 on the inner wall surface of the groove 2 has a small inclination angle 16 of the wall surface at this point. In this case, more light is directed toward the wall surface of the adjacent groove 2 than light directed directly to the front, that is, upward in FIG. The light incident on the wall surface of the adjacent groove 2 is reflected upward at the glass interface, the light that is bent inside the adjacent groove 2, that is, the outside of the glass, and reflected downward. Then, the light is divided into light that is emitted to the front side while repeating several reflections. In order to form the groove 2 satisfying such conditions, not only the cross-sectional shape of the groove 2 but also the distance between the groove 2 and the adjacent groove 2 is important. Therefore, in order to further reduce the condition of the cross-sectional shape, a description will be given with reference to FIG. 6 and FIG. 2 described above.

First, in order to limit the light emitted directly from the top of the groove 2 to the front, the width of the top 14 (also 14) is set to the width of the bottom opening 12 (also 1 2). ) And the groove 2 has a V-shaped cross section. To be close to. Of course, the cross section of the side wall surface of the groove 2 does not necessarily have to be straight, but it is configured so that the width of the cross section of the groove 2 gradually narrows from the bottom opening 12 toward the top 14. . The groove 2 having such a shape can be formed by a chemical etching method, but is more easily formed by a sand blast method.

The angle (inclination angle) 16 between the side wall surface of the groove and the side wall surface of the groove adjacent to the groove is set within a certain angle range. It is desirable that the distance 13 between them is shorter.

By referring to FIG. 2, the above relationship becomes clearer. That is, FIG. 2A shows a cross-sectional shape of a groove of an example of the front glass substrate of the present invention, and FIGS. 2B, 2C, and 2D show cross-sectional shapes of the groove of the conventional front glass substrate. Are examples of the structure when both are formed at random. Conventionally, it has been considered that the cross-sectional shape of the groove in FIG. 2B or FIG. 2C is good. In this case, light from the side of the groove hardly exits to the front. In addition, since the distance 13 between the openings at the bottom of the groove in FIG. 2D is large, light emitted from the side wall surface of the groove does not reflect on the side wall surface of the adjacent groove.

In the groove shown in FIG. 2A, which is an example of a groove satisfying the above-mentioned necessary conditions, most of the light irradiated from the side wall surface of the groove to the side wall surface of the adjacent groove is totally reflected to the front side. Considering that the refractive index of ordinary glass is about 1.5, the inclination angle 16 is about 45 degrees when the width 13 between the adjacent grooves is close to zero. It can be seen that this is the case. However, when the inclination angle 16 exceeds 90 degrees, the irradiation of the inner wall surface of the adjacent groove is naturally eliminated. In addition, since the gap 13 is usually about half of the bottom opening 12, the inclination angle must be slightly smaller than the above-mentioned about 45 degrees. Therefore, the inclination angle 16 is suitably, for example, 30 degrees or more and 90 degrees or less.

By the way, such a cross-sectional shape and the distance between adjacent grooves When forming a groove in a glass substrate, it is difficult to control the angle of the wall surface of the groove in the process. Therefore, it is preferable to define the groove width and the depth of the formed groove pattern. To satisfy such conditions

A V-shape in which the width narrows linearly from the opening 12 at the bottom of the groove 2 toward the substantially flat top portion 14 above, or a U-shape that narrows with a gentle curve. The width of 14 is less than half the width of the opening 12 at the bottom, and the height from the opening 12 at the bottom to the top 12, that is, the depth 11 of the groove is the opening at the bottom. If the groove has a cross-sectional shape that is larger than the portion 12 and that the gap width 13 between the adjacent grooves 2 must be smaller than half of the width 12 of the bottom opening 12, As described above, the light from the phosphor screen is effectively radiated to the front side by making full use of the wall reflection of the contact groove.

Next, the configuration of another example of the front glass substrate for a display device according to the embodiment of the present invention will be described with reference to FIG. First, it is assumed that the shape of the groove 2 satisfies the conditions of the example of the front glass substrate for a display device shown in FIGS. The features of the front-side glass substrate for the display device shown in Fig. 7 are that the light-absorbing layer 4 of black or the like is formed on the glass surface at the top 12 of the groove 2, and the gap between the adjacent grooves 2 That is, the light reflection layer 5 of white color or the like was formed on the glass surface of the gap.

The light absorbing layer 4 can be easily formed by a method in which a black pigment is applied with a solvent and precipitated. In addition, when the inner wall surface of each groove 2 is separately coated with phosphors 3 of luminescent colors such as red, green, blue, etc., a pigment of a color corresponding to the phosphor 3 is coated on the inner wall of the groove 2 prior to that. A color filter is formed by coating on the inner wall surface, and by adjusting the concentration of the pigment at the time of coating, the pigment of each color on the crown 12 is thickened to form a light absorbing layer. It can be 4.

The light reflecting layer 5 is formed by applying a white pigment or the like to the glass surface of the gap between the adjacent grooves 2 by a method such as screen printing. By forming. After forming the pigment layer, the light absorbing layer 4 and the light reflecting layer 5, the phosphor layer 3 is applied on the inner wall surface of the groove 2 by screen printing.

The structure of the front glass substrate 1 in FIGS. 4 to 6 and FIG. 7 is preferably applied to a front glass substrate constituting a flat tube body of a flat discharge display device which is a gas discharge tube.

FIG. 10 is an exploded perspective view showing an example of the flat-type discharge display device according to the embodiment of the present invention to which such a front-side glass substrate is applied. The structure of the flat-type discharge display device will be described below. . The flat-type discharge display device is based on the prior application of the same inventor proposed earlier by the present application.

(Japanese Patent Application No. 2000-0-13180) The above-mentioned front glass substrate is applied to the flat discharge display device.

In FIG. 10, reference numeral 1 denotes a front-side glass substrate. The front-side glass substrate 1 has a plurality of grooves having the same cross-sectional shape and formed at regular intervals, each having an inner wall coated with a phosphor 3. Has two. Since the groove 2 is formed in the front glass substrate 1, no electrodes can be provided on the front glass substrate 1. For this reason, necessary electrodes are provided as multilayer electrodes on the rear glass substrate 41 side.

In FIG. 10, a plurality of address electrodes 42 having the same width are formed on the rear glass substrate 41 at regular intervals by a method such as screen printing so as to be parallel to each other. The plurality of address electrodes 42 are arranged so as to face each other and intersect with each other via an insulating layer 43 to form an XY matrix and perform a display discharge. Sustain electrodes 44 and 45. There is a through hole 46 as a structure that characterizes this flat discharge display device.

The through holes 46 are effective means for facilitating the occurrence of address discharge. These multiple sustain electrodes 44 and 45 are Overall, it is covered by an upper dielectric layer 47. Accordingly, this flat discharge display device is a so-called single-substrate three-electrode AC flat discharge display device. Ultraviolet light generated by the discharge between the sustain electrodes 44 and 45 efficiently irradiates the phosphor layers 3 formed on the inner wall surfaces of the plurality of grooves 2 of the front glass substrate 1 with high efficiency.

The light generated from each of the phosphors 3 is reflected by the wall surface of the adjacent groove 2 and is efficiently irradiated on the front side with a certain degree of directivity. Next, referring to FIG. The structure of another example of the front-side glass substrate for a display device of the embodiment will be described. First, the shape of the groove 2 satisfies the conditions for the front glass substrate shown in FIGS. The front-side glass substrate 1 in FIG. 8 has a low-speed electron-beam fluorescent display (VFD: Vacuum Fluorescent Display) or a field emission type with a field emission force source, rather than a flat-panel discharge display (PDP). It is suitable for a glass substrate on the front side of an electron beam type display device called a field-type fluorescent display device (FED: Field Emission Display).

Referring to FIG. 8, a transparent conductive film 6 is formed on the inner wall surface of the groove 2 of the front glass substrate 1. The transparent conductive film 6 can be easily formed by vacuum-depositing an oxide oxide or the like on the inner wall surface of the groove 2. The transparent conductive layer 6 is an electrode for accelerating electrons by applying an anode potential to the phosphor layer 3 which also has conductivity.FIG. 11 shows the application of the front glass substrate 1 of FIG. An example of a field emission fluorescent display device (FED) according to an embodiment of the present invention is shown below, and its structure will be described below. A plurality of first electrodes 52 are provided on the rear-side glass substrate 41, and intersect with the plurality of first electrodes 52 via an insulating layer 53, and the XY matrix A plurality of second electrodes 54 constituting a matrix are provided. these Each of the plurality of first and second electrodes 52 and 54 intersects through the through hole. On the plurality of first electrodes 52, a force source layer 55, that is, for example, a field emission type needle-shaped cathode layer and a thin carbon film are mounted. -Then, by applying a voltage between the plurality of electrodes 52 and 54, electrons are emitted from the force source layer 55. The emitted electrons are accelerated by the voltage applied to the electrode 6 on the inner wall surface of the groove 2 of the front glass substrate 1 and irradiate the fluorescent screen 3 on the electrode 6 to emit light. Let it. Light generated by the phosphor 3 in a certain groove 2 is reflected on the wall surface of the groove 2 adjacent to the certain groove 2, and is efficiently radiated to the front side with a certain degree of directivity.

Next, another example of the front glass substrate of the embodiment of the present invention will be described with reference to FIG. The groove 2 formed in the front glass substrate 1 satisfies the condition of the groove 2 of the front glass substrate 1 shown in FIGS. The front-side glass substrate 1 of this structure is a high-speed electron-beam fluorescent display device, that is, an electron-beam display device called a cathode ray tube (CRT) or a field emission fluorescent display device (FED) with a field emission force source. It is suitable to be applied to.

Referring to FIG. 9, a phosphor 3 is applied to the inner wall surfaces of the plurality of grooves 2 of the front glass substrate 1, and a conductive film, that is, a metal is coated so as to cover the surface of the phosphor 3. Film 7 has been applied. The metal film 7 is not necessarily required to be transparent. For example, an aluminum film formed by vapor deposition is generally used. In a cathode ray tube (CRT), the metal film is called a metal back layer, which is used to accelerate electrons. In addition to applying an electric potential, it has an effect of reflecting light emitted from the phosphor 3 into the tube.

FIG. 12 shows a conceptual diagram of a part of an example of a cathode ray tube (CRT) according to an embodiment of the present invention to which the front glass substrate of FIG. 9 is applied. still, Although illustration of other components of the cathode ray tube (CRT) is omitted, a shadow mask or an aperture grill is provided on the back side of the groove 2 of the front glass substrate 1, that is, inside the tube of the cathode ray tube (CRT). A metal plate having a color selection function as described above is provided. Further, it has a beam deflecting mechanism such as an electron gun for generating the electron beam 60 and a deflection yoke, similarly to the ordinary cathode ray tube.

Further, it goes without saying that the front glass substrate 1 may be combined with a structure having the light absorbing layer 4 described with reference to FIG. Among the field emission fluorescent display devices (FED) having the field emission cathode described above, there is a high-speed electron type similar to a cathode ray tube (CRT). In that case, FIG. A glass substrate on the front side with a structured structure is suitable.

Next, the structure of the arc tube to which the front glass substrate described with reference to FIGS. 4 to 6 is applied will be described with reference to FIG. This arc tube is very similar to the structure of the flat panel light emitting display (PDP) described with reference to FIG. The pair of discharge electrodes (sustain electrodes) 44 and 45 are located on both sides of the groove 2 of the front glass substrate 1. The number of the sustain electrodes may be only one pair. In this case, there is no need to separate the pixels in the arc tube, so it is not necessary for the front glass substrate 1 and the rear glass substrate 41 to be in contact with each other. Luminous efficiency increases.

In FIG. 13, a pair of sustain electrodes 44 and 45 are covered with an upper dielectric layer 47, respectively, to form an AC discharge electrode similar to that of a flat discharge display (PDP). By using or instead of the sustain electrodes 44, 45, a pair of coiled hot cathodes can be provided to constitute a discharge light emitting device for lighting.

Hereinafter, the configuration of an example of the glass substrate for a flat discharge display device according to the embodiment of the present invention will be described with reference to FIG. Figure 14 shows the gas 1 shows a cross-sectional view of a lath substrate. Reference numeral 101 denotes a glass substrate, and a plurality of grooves 1 parallel to each other are formed on the glass substrate 101 by a sand plasm method or a chemical etching method so that the cross-sectional shape becomes V-shaped. Form 0 2. In this case, the opening width and the depth of the groove 102 are set to be substantially the same, for example. And the groove

When the depth of 102 is larger than the opening width (V-shaped groove), the sand-plast method is suitable for forming the groove 102. When the depth of the groove 102 is shallower than the opening width (U-shaped groove), either the sandblast method or the chemical etching method may be used.

Now, at the crown 103 of the formed grooves 102, the electrode 1

0 4 is formed. The method for forming the electrode 104 will be described later. Now, after forming the electrode 104, the phosphor layer 105 is formed inside the groove 102, that is, on the inner wall surface of the groove 102 and on the electrode 1G4. Although omitted in FIG. 14, the electrode 104 can be formed as a so-called AC-type electrode by covering the electrode 104 with a dielectric layer.

The glass substrate 101 of FIG. 14 is applicable to both the front glass substrate and the rear glass substrate of the flat-panel discharge display device. The structure of the flat discharge display device when the glass substrate 101 of FIG. 14 is used as the front glass substrate will be described later. When the glass substrate 101 of FIG. 14 is used as the rear glass substrate, a white or other light reflecting layer is formed on the inner wall surface of the groove 102 before the phosphor layer 5 is formed. Just do it.

When the glass substrate shown in FIG. 4 is used as the front glass substrate of a flat-panel discharge display device, the phosphor layer 105 applied to the wall of the groove 102 has a rear glass substrate facing the phosphor layer 105. When the light is excited and emitted by ultraviolet rays generated by the discharge at the upper sustain electrode, the light is transmitted through the glass substrate 101 and directly emitted to the front side. Both are reflected on the wall surface of the adjacent groove 102 and radiated to the front side. In Fig. 14, when the depth of the groove 102 is deeper than the opening of the groove 102, the groove Since the cross-sectional shape of 102 becomes a deep V-shape, and as described above, the area of the inner wall surface of the groove 102 becomes wider,

The coating area of 103 increases, and the amount of light from the phosphor 3 increases.However, since the cross section is V-shaped, the phosphor 105 above the electrode 104 at the top 103 has ultraviolet rays. It is far from the discharge part, which is the source, and the luminescence is weak. Most of the luminescence is radiated from the wall of the groove 102 to the wall of the groove 102 on both sides, where it is reflected and emitted to the front. Therefore, the presence of the electrode 104 at the top '103 of the groove 10'2 has almost no effect on the amount of emitted light. In addition, by making the electrode 104 black, external light is absorbed and the contrast can be improved.

Accordingly, the V-shaped cross-section of the groove 102 not only increases the area of the phosphor on the wall of the groove 102, but also a structure suitable for efficiently emitting the emitted light to the front side. Therefore, both the brightness and the contrast of the flat discharge display device can be increased.

When the glass substrate 101 having the structure shown in FIG. 14 is applied to the rear-side glass substrate, it operates in the same manner as a conventional flat-type discharge display device having a reflective phosphor screen. This has the effect of greatly simplifying the process.

Next, a method for forming the electrode layer 104 in the groove of the glass substrate according to the embodiment of the present invention will be described with reference to FIG. Although the description of the method of forming the groove 102 with respect to the glass substrate 101 is omitted,

Generally, the sand blast method is suitable.

As shown in Fig. 15, a V-shaped groove 102 is filled with a conductive paste, for example, a screen printing paste such as silver or nickel. And dry it once. It should be noted that the entire surface of the inner wall of the groove 102 may be pushed in such that a paste for screen printing is applied, and screen printing is preferable in order to further increase the uniformity.

When the screen printing paste is dried, the paste adheres to the entire wall of the groove 102, as shown in Fig. 15A, but the cross section of the groove is reduced.

Due to the V-shape, a pool of the best is formed at the top 103. Therefore, when the wall surface of the groove 102 is removed by the sandblast method, only the portion of the paste pool remains.

Then, by sintering the paste remaining in the groove 102, the electrode layer 1Q4 can be formed in the groove 102 as shown in FIG. 15B.

Since the dried conductive base is easier to remove by the sand-plast method than the sheet glass, it is extremely easy to form the electrode 104 in a shape as shown in FIG. 15B.

By utilizing the fact that the shape of the groove 102 is V-shaped, a puddle can be formed at the top 103 of the head. When removing the paste on the wall of the groove 102 by sandblasting except for the top 103 of the groove 102, the conductive paste after drying and before sintering, and the sheet glass It is easy to remove only the conductive paste without using a selective mask pattern by utilizing the difference in hardness

¾).

Next, the structure of the glass substrate for a flat discharge display device according to the embodiment of the present invention will be described with reference to the cross-sectional view of FIG. First, a groove 102 having a U-shaped cross section is formed in a glass substrate 1 by a sand blast method or a chemical etching method. As mentioned above, the groove

When the depth of the groove 102 is relatively shallow with respect to the opening width of 102, the groove 102 can be easily formed by the sand-plast method or the chemical etching method. In this case, the cross-sectional shape in Figure 15 is V-shaped. Since the top 103 is almost flat compared to the groove 102, the second groove 110 is formed here as a thin electrode forming groove. After that, the second groove 110 is filled with a conductive ink paste, and this is formed in the same manner as described above to form the Xiaoyang layer 104. .

In order to efficiently irradiate the phosphor 105 with ultraviolet rays from gas discharge, if the cross-sectional shape of the groove 102 is V-shaped, the opening width of the groove should be 100 to 200 m. It is suitable when the depth of the groove is also about 100 to 200 βm. However, in the case of forming a relatively large pixel with an opening width larger than that, the effect of the cross-sectional shape of the groove 102 being V-shaped is reduced, so that the U-shaped groove is more suitable. o.

Next, a method of manufacturing the glass substrate for a flat discharge display device described with reference to FIG. 16 will be described with reference to FIG. FIG. 17A describes a method for manufacturing the glass substrate of Embodiment 3 described in 3 above. In the glass substrate 101 of FIG. 17A, a groove 102 having a U-shaped cross section is formed by a sand blast method, a chemical etching method, or the like.

First, a mask 111 made of resin or the like, which has excellent sand resistance or solvent resistance, is screened on the inner wall surface of the groove 102 so as to cover the inner wall surface of the groove 102. Print. In this case, the printed pattern is made to match the pattern of the wall surface of the groove 102, and the printed resin mask 1 1 1 is stripped at the top 3 of the groove 102 in a strip shape. To print.

Thereafter, when a sand blast method or a chemical etching method is applied to the groove 102, the resin mask 111 is formed.

A second groove 110 is formed at the top 103 of 02.

After that, as shown in FIG. 17C, the conductive groove 104A is embedded in the second groove 110 as described above, and dried. Then, when the ink paste 104A on the inner wall surface of the groove 102 except for the second groove 110 is removed by the sand blast method, as shown in FIG. An electrode layer 104 is formed in the second groove 110.

As described above, it is easy to form the second groove 110 at the top 103 of the U-shaped groove 102 having a U-shaped cross section, and to form the electrode layer 104 having a narrow line width therein. It is. '

Next, referring to the exploded perspective view of FIG. 18, an example of an AC flat discharge type display device using a glass substrate 101 on which a groove 102 having a V-shaped cross section is formed is shown. The structure will be described. In this example, the glass substrate 101 of FIG. 14 is used as a front glass substrate.

In this AC type flat discharge display device, a plurality of electrode layers 104 formed on the top 103 of a plurality of grooves 102 of a glass substrate 101 are used as a plurality of address electrodes, On the rear glass substrate 106, a plurality of alternately arranged sustain electrodes 107, which are arranged in parallel with each other, constitute an XY matrix orthogonal to the plurality of address electrodes 104.

, 108, and a plurality of sustain electrodes 107, 108 are each covered with a dielectric layer 109 to form an AC-type discharge electrode. Device. In FIG. 18, the dielectric layer 109 is illustrated with a part thereof left and the remaining part separated.

The sustain electrodes 107 and 108 on the rear glass substrate 106 are easily formed by printing a conductive pace ink such as silver or nickel on a screen and firing it. . Note that, similarly to a normal three-electrode type flat discharge display device, one of the sustain electrodes 107 and 108 uses the XY matrix as the opposite address electrode 104. The other sustain electrode is connected to each pixel in common, and is used only for sustain discharge.

The pair of sustain electrodes 107 and 108 are formed on their respective surfaces. This is an AC type electrode covered with a force and dielectric layer 109, and further covered with a protective layer such as magnesium oxide. In Figure 18

The illustration of the protective layer is omitted.

On the other hand, on the front side of FIG. 18, the glass substrate 101 having the V-shaped groove having the above-described cross-sectional shape is illustrated as a front-side glass substrate. A groove having a U-shaped cross section may be formed in the front glass substrate 101.

It is also possible to cover the surface of the electrode layer 104 as an address electrode with a dielectric layer to form an AC electrode. Also, by making the electrode layer 104 black, the display contrast of the flat-panel discharge display device can be increased.However, before the formation of the electrode layer 104, the grooves 102 have different emission colors. By forming the corresponding color filters by applying the pigments of the respective colors, the contrast and the color purity can be improved.

FIG. 18 shows a three-electrode surface-discharge flat-panel discharge display device having a transmissive phosphor screen in which the phosphor screen is on the front side. The front glass substrate 101 and the rear glass substrate 106 are combined. By replacing the electrodes 107 and 108 with transparent electrodes, a three-electrode surface discharge type flat discharge display device having a reflective phosphor screen can be formed.

In a three-electrode surface-discharge flat-panel discharge display device with a universal fluorescent screen that uses a front-side glass substrate with a V-shaped or U-shaped groove in the cross section, the sustain discharge is applied to the rear glass substrate. The ultraviolet light generated from the sustain electrode excites and emits the fluorescent screen in the groove of the front glass substrate. The emitted light is applied to the transparent glass between the grooves, and most of the light is reflected by the wall surface of the adjacent groove and exits to the front. The portion of the electrode that acts as an address electrode at the top of the groove does not allow light emitted from the phosphor to pass through, but as shown in Fig. 18, when the groove has a V-shaped cross section, Since the light emission of the part is weak, there is little effect on the brightness, and it is rather flat It has a great effect of improving the contrast of the display device. In addition, when the cross-sectional shape of the groove is U-shaped, the pixel is relatively large, and thus the width of the electrode is reduced, so that the influence on the luminance is small.

Claims

The scope of the claims

On one surface side of the glass substrate, a plurality of grooves having substantially the same V-shaped cross-section and having a substantially flat top are formed at regular intervals in parallel with each other,

A front side glass substrate for a display tube, wherein a phosphor layer is formed on the top portion and the inner wall surface of the plurality of grooves.

In the front glass substrate for a display tube according to claim 1,

In the cross section of the plurality of grooves, the width of the crown is not more than half the width of the opening, and the height from the opening to the crown is

A front-side glass substrate for a display tube, wherein the width of the gap is larger than the width of the opening and a gap width between the openings of the grooves adjacent to each other is smaller than half of the width of the opening of the groove.

The front glass substrate for a display tube according to claim 1 or 2,

A front-side glass substrate for a display tube, wherein a light absorbing layer is formed on top of the plurality of grooves.

3. The front glass for a display tube according to claim 1 or 2.

A front-side glass substrate for a display tube, wherein a light reflection layer is formed in a gap between the openings adjacent to each other in the plurality of grooves. -·

The front glass substrate for a display tube according to claim 1 or 2,

A light absorbing layer is formed on the top of the plurality of grooves, and a light reflecting layer is formed on a gap between the adjacent openings of the plurality of grooves. Front glass substrate for display tubes.

6. The front glass substrate for a display tube according to claim 1 or 2,

A front-side glass substrate for a display tube, characterized in that a transparent conductive layer is formed on the top of the plurality of grooves and on the inner wall surface below the phosphor layer.

7. The front glass for a display tube according to claim 2 or 3.

A front-side glass substrate for a display tube, wherein a light-reflective conductive layer is formed on the phosphor layer.

8. On one surface side of the glass substrate, a plurality of grooves having the same substantially V-shaped cross-sectional shape and having a substantially flat top are formed parallel to each other at regular intervals. A front-side glass substrate for a display tube, wherein a phosphor layer is formed on the top and the inner wall surface of the display device;

A back side glass substrate having an address electrode and a sustain electrode,

A flat-panel discharge display device characterized in that a flat tube in which gas is filled is constituted by the front glass substrate and the rear glass substrate.

9. The flat-panel discharge display device according to claim 8, wherein in the cross-section of the plurality of grooves, the width of the crown is equal to or less than half of the width of the opening, and the width from the opening to the crown is Wherein the width of the opening is greater than the width of the opening, and the width of the gap between the openings of the adjacent grooves is less than half the width of the opening of the groove. Discharge display device.

0. In the flat-type discharge display device according to claim 8 or 9,

A light absorbing layer is formed on the top of the plurality of grooves. And a flat discharge display device.

11. The flat discharge display device according to claim 8 or 9, wherein:

A flat discharge display device, wherein a light reflecting layer is formed in a gap between the openings adjacent to each other in the plurality of grooves.

12. In the flat-panel discharge display device according to claim 8 or 9,

A light absorbing layer is formed on the top of the plurality of grooves, and a light reflecting layer is formed on a gap between the openings adjacent to each other in the plurality of grooves. Planar discharge table

13. On one side of the glass substrate, a plurality of grooves having substantially the same V-shaped cross-section and having a substantially flat top are formed parallel to each other at regular intervals. A phosphor layer is formed on the top and inner wall surfaces of the plurality of grooves, and on the top and inner wall surfaces of the plurality of grooves, under the phosphor layer, for electron acceleration. A front glass substrate on which a transparent conductive layer to which an anodal potential is applied is formed;

A back glass substrate on which electrodes including a cathode and a pixel selection control gate are formed, and

A low-speed electron-beam-type fluorescent display device characterized in that a flat tube is constituted by the front glass substrate and the rear glass substrate.

14. In the low-speed electron beam type fluorescent display device according to claim 13,

In the cross section of the plurality of grooves, the width of the crown is not more than half the width of the opening, and the height from the opening to the crown is A low-speed electron beam type fluorescent display device characterized in that the width of the gap between the openings of the grooves adjacent to each other is smaller than half the width of the openings of the grooves. .

15. On one surface side of the glass substrate, a plurality of grooves having substantially the same V-shaped cross-sectional shape and having a substantially flat top are formed parallel to each other at regular intervals. A phosphor layer is formed on the top and inner wall surfaces of the plurality of grooves, and on the top and inner wall surfaces of the plurality of grooves, under the phosphor layer, for electron acceleration. A front glass substrate on which a transparent conductive layer to which a cathode potential is applied is not formed;

A flat tube body is constituted by the front glass substrate and the rear glass substrate.

16. The field emission fluorescent display device according to claim 15, wherein:

In the cross section of the plurality of grooves, the width of the crown is not more than half of the width of the opening, and the height from the opening to the crown is 0, larger than the width of the opening, and A field emission fluorescent display device characterized in that a gap width between openings of the grooves adjacent to each other is smaller than half the width of the openings of the grooves.

17. On one surface side of the glass substrate, a plurality of grooves having substantially the same V-shaped cross-section and having substantially flat tops are formed at regular intervals 5 in parallel with each other. A phosphor layer is formed on the top and inner wall surface of the groove, and a light-reflective conductive layer to which a cathode potential for electron acceleration is applied is formed on the phosphor layer. A front-side glass substrate, A back glass substrate provided with an electron gun and electron beam deflecting means,

A cathode ray tube, characterized in that a tube is constituted by the front glass substrate and the rear glass substrate.

1 '8. The cathode ray tube according to claim 17,

In the cross section of the plurality of grooves, the width of the crown is not more than half of the width of the opening, and the height from the opening to the crown is greater than the width of the opening, and A cathode ray tube, wherein a gap width between adjacent openings of the groove is smaller than half of a width of the opening of the groove.

19. On one surface side of the glass substrate, a plurality of grooves having the same substantially V-shaped cross-section and having a substantially flat top are formed at regular intervals in parallel with each other. A phosphor layer is formed on the top and inner wall surface of the groove, and a light-reflective conductive layer to which a cathode potential for electron acceleration is applied is formed on the phosphor layer. A front glass substrate,

'' Having an electron gun and a rear glass substrate provided with electron beam deflecting means,

A field emission fluorescent display, characterized in that a tube is constituted by the front glass substrate and the rear glass substrate.

20. In the field emission fluorescent display device according to claim 19, in the cross section of the plurality of grooves, the width of the crown is not more than half of the width of the opening. The height to the crown is larger than the width of the opening, and the gap width between the openings of the adjacent grooves is smaller than half the width of the opening of the groove. Field emission fluorescent display device.

2 1. On one side of the glass substrate, a plurality of grooves having substantially the same V-shaped cross section and having a substantially flat top are formed parallel to each other at regular intervals. A front-side glass substrate in which a phosphor layer is formed on the top of the groove and the inner wall surface; and a rear-side glass substrate provided with a pair of coiled hot cathodes located at both ends of the plurality of grooves. Has,

A discharge light emitting device for lighting, characterized in that a tube is formed by the front glass substrate and the rear glass substrate.

22. The discharge light emitting device for illumination according to claim 21, wherein in the cross section of the plurality of grooves, the width of the crown is not more than half of the width of the opening, and The height to the crown is larger than the width of the opening, and the gap width between the openings of the adjacent grooves is smaller than half the width of the opening of the groove. Discharge light emitting device for lighting.

23. On one surface side of the glass substrate, a plurality of substantially V-shaped grooves having the same cross-sectional shape are formed at regular intervals in parallel with each other, and an electrode layer is formed at the top of the plurality of grooves. A glass substrate for a flat-panel discharge display device, wherein a phosphor layer is formed on the inner wall surfaces of the plurality of grooves and on the electrode layer.

24. On one surface side of the glass substrate, paste-shaped conductive ink is applied to a plurality of grooves having the same cross-sectional shape of a substantially V-shape formed in parallel to each other at regular intervals, and The above-mentioned paste-like conductive ink pool is formed at the top of the groove of

By drying the paste-shaped conductive ink in the plurality of grooves and sandblasting the glass substrate, the conductive ink attached to the inner wall surfaces of the plurality of grooves is removed. A strip-shaped conductive ink is left on the top of the plurality of grooves,

A method for forming an electrode on a glass substrate for a flat discharge display device, comprising sintering the remaining striped conductive ink to form an electrode.

25. On one surface side of the glass substrate, a plurality of first grooves having the same U-shaped cross-sectional shape are formed parallel to each other at regular intervals, and each head of each of the plurality of first grooves is formed. A second groove is formed at the top and electrode shoulders are formed in the plurality of second grooves, respectively,

A glass substrate for a flat-panel discharge display device, wherein a phosphor layer is formed on the inner wall surfaces of the plurality of first grooves and on the electrode layer.

26. On one surface side of the glass substrate, a portion excluding the tops of the plurality of first grooves having the same cross-sectional shape of a substantially U-shape formed in parallel to each other at regular intervals is covered with a mask,

Forming a second groove by a sand blast method or a chemical etching method on the top of each of the plurality of first grooves through the mask;

By applying a paste-like conductive ink over the inside of the plurality of first grooves and the inside of the second groove at the top of each of the plurality of first grooves, Forming a reservoir of the paste-like conductive ink in the second groove;

Drying the conductive ink in the plurality of first grooves and in the second grooves at the top of each of the plurality of first grooves;

By sand-placing the glass substrate, the conductive ink adhering to the inner wall surfaces of the plurality of grooves is removed. The stripe-shaped conductive ink is left in the plurality of second grooves,

A method of forming an electrode on a glass substrate for a flat discharge display device, characterized by forming an electrode by sintering the remaining striped conductive ink.

27. On one surface side of the glass substrate, a plurality of substantially V-shaped grooves having the same cross-sectional shape are formed at regular intervals in parallel with each other, and an address electrode is formed at the top of the plurality of grooves. A front-side glass substrate having a phosphor layer adhered and formed on the inner wall surfaces of the plurality of grooves and the electrode layer;

A back glass having a pair of mutually parallel sustain electrodes forming an XY matrix and an AC-type discharge electrode comprising a dielectric layer covering the pair of zatin electrodes, crossing over the plurality of address electrodes. And a substrate,

A flat discharge display device characterized in that a flat tube body filled with gas is constituted by the front glass substrate and the rear glass substrate. ·

28. On one surface side of the glass substrate, a plurality of first grooves having the same U-shaped cross-sectional shape are formed parallel to each other at regular intervals, and respective heads of the plurality of first grooves are formed. A second groove is formed on the top, an electrode layer as an address electrode is formed in each of the plurality of second grooves, and an inner surface of the plurality of first grooves and the electrode are formed. A front glass substrate ′ having a phosphor layer deposited on the layer,

A back glass including a pair of mutually parallel sustain electrodes constituting an XY matrix intersecting with the above-mentioned plurality of address electrodes and an AC type discharge electrode comprising a dielectric layer covering the pair of sustain electrodes. And a substrate, A flat discharge display device characterized in that a flat tube in which gas is sealed is formed by the front glass substrate and the rear glass substrate.

A plurality of grooves having substantially the same V-shaped cross-section and having a substantially flat crown are formed on one surface side of the glass substrate in parallel with each other at regular intervals. A front-side glass substrate in which a phosphor layer is formed on the top and the inner wall surface; and a rear-side glass substrate provided with a pair of AC-type discharge electrodes located at both ends of the plurality of grooves. And

A discharge light emitting device for illumination, characterized in that a tube is formed by the front glass substrate and the rear glass substrate.

29. The discharge light emitting device for illumination according to claim 29, wherein in the cross section of the plurality of grooves, the width of the crown is not more than half of the width of the opening, and the width of the crown from the opening is from the opening to the crown. The width of the opening is greater than the width of the opening, and the width of the gap between the openings of the adjacent grooves is smaller than half the width of the opening of the groove. Light emitting device.