KR20030004358A - Front Side Glass Substrate For Display And Display Device - Google Patents

Abstract

In the present invention, a plurality of grooves (2) having substantially equal V-shaped cross-sectional shapes on one surface side of the glass substrate (1) and having substantially flat head portions are formed in parallel with each other at regular intervals, A front side glass substrate for a display tube in which a phosphor layer 3 is deposited on the head portion and inner wall surfaces of the plurality of grooves 2. According to the present invention, the coating amount of the phosphor in the groove can be increased, moreover, the coating amount of the phosphor is mainly increased, and the emitted light of the phosphor from the side of the groove can be efficiently irradiated to the front side, so that the luminance and the luminous efficiency are improved. This improved front-side glass substrate for display tubes can be obtained.

Description

Front Side Glass Substrate For Display And Display Device

In a flat discharge display device called a plasma display panel (PDP), a phosphor is applied to a glass substrate on the back side, and ultraviolet light generated by discharge by an electrode on the glass substrate side on the front side is irradiated to the phosphor to emit light. Although a flat discharge display device having a reflective fluorescent surface has a mainstream, there are also flat discharge display devices having a transmissive fluorescent surface in which a fluorescent substance is coated on the front glass substrate side.

Furthermore, when the flat discharge display device having the reflective fluorescent surface is compared with the flat discharge display device having the transmissive fluorescent surface, since the former is also coated with phosphors on the partition walls forming the pixels, the light emitting area is wide and the luminance is high. The latter is said to be inferior in brightness to the former.

Thus, the front side glass substrate according to the invention (in Japanese Patent Application Laid-Open No. 11-164292) relating to the source by the same applicant and the same inventor is directly connected to the front side glass substrate 1, as shown in FIG. The grooves 2 are formed by sandblasting or chemical etching, and the phosphors 3 are coated in the grooves 2 to form the grooves 2. According to this front side glass substrate, since the coating area of fluorescent substance can be ensured more than twice that of the conventional front side glass substrate, the effect of brightness improvement was enough.

However, in the front glass substrate of such a structure, the cross-sectional shape of the grooves greatly influences the luminous luminance of the phosphor applied in the grooves, but the invention for this source does not mention the cross-sectional shape of the grooves. Instead, as usual considered, it was considered that it is desirable to maximize the amount of light emission at the center of the groove as seen from the front side, that is, the head part which is a substantially flat portion of the groove.

Therefore, the cross sectional shape of the groove is as close to the width of the opening 12 as possible, as shown in Fig. 2B or 2C (this is also 14), or as shown in Fig. 2B or 2C, or As shown in Fig. 2B, it is considered that the inclination angle 16 between the groove and the groove adjacent to the groove is larger.

According to such conventional considerations, the maximum amount of light radiation in the center of the grooves is complicated in the process and limits the depth of the grooves, so that the area of the side surface of the inner wall of the grooves cannot be increased. In addition, when the width of the head portion of the cross section of the groove is widened, the angle of inclination 16 is inevitably small, so that the amount of light radiation from the side surface of the groove to the front surface decreases. For the above reason, the improvement of the luminance by the front glass substrate of this structure is said to have its own limitations.

Moreover, there was a problem that the contrast was poor in the front glass substrate provided with the groove of the conventional structure. Usually, in order to raise contrast, a light absorption layer is provided in the part in which the fluorescent substance of the front glass substrate is not apply | coated, ie, the gap part between pixels. That is, it was common to blacken the gap part. However, as is apparent from Fig. 1, the gap between the grooves adjacent to each other is an inner portion sandwiched by the phosphor coating portion when viewed from the front side, so that the effect of absorbing external light even when this portion is blackened There was no effect of improving contrast. In addition, the front glass substrate of this structure can be applied not only to a flat discharge display device but also to a cathode ray tube (CRT) and a fluorescent display tube (VFD) that emit light by applying a phosphor. The same conditions are necessary for the cross-sectional shape of.

Next, referring to Fig. 3, the structure of an AC type planar discharge display device (PDP) in a three-electrode surface discharge type having a conventional reflective fluorescent surface will be described. In the three-electrode surface discharge type, the AC type planar discharge display device includes the following structure in a tube in which the periphery of the front glass substrate (not shown) and the rear glass substrate 21 are sealed by frit glass. In addition to being stored, the inside of the tube is evacuated and discharge gas (gas) such as helium, neon, argon, xenon or the like or a mixture thereof is sealed at a pressure of 200 torr to 400 torr.

On the rear side glass substrate 21, a plurality of address electrodes 27 having equal widths extending in the longitudinal direction are formed to be deposited while maintaining predetermined predetermined intervals. On the back side glass substrate 21 and on the plurality of address electrodes 27, a dielectric layer 22 is formed by printing such as low melting glass or the like so as to cover them. In addition, 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 as if the plurality of address electrodes 27 are sandwiched on the rear glass substrate 21. Phosphor 24 is coated on the inner wall of the groove composed of the wall surface of the rib 23 facing each other and the surface of the dielectric layer 2 on the address electrode 27.

3, a pair of flat plates of a plurality of pairs in parallel with each other, as substantially orthogonal to the plurality of address electrodes 27 and the plurality of partition walls 23 of the rear side glass substrate 21, are not shown in FIG. Sustain electrodes (display electrodes) 28 and 29 as discharge electrodes of the same width are formed to be deposited. One of the plurality of electrodes 28 of the pair of sustain electrodes 28 and 29 forms an XY matrix between the plurality of address electrodes 27. Dielectric layers 25 are deposited on the front glass substrate and on the pair of sustain electrodes 28 and 29 in a plurality of layers as if they were coated. The dielectric layer 25 is usually formed in a uniform thickness on the plane of each pair of sustain electrodes 28 and 29 without discriminating from pixel to pixel. The surface of the dielectric layer 25 is further covered with a protective layer 26 such as MgO.

The dielectric layer 25 covering the plurality of sets of sustain electrodes 28 and 29 of the planar discharge display device having such a structure is formed with a uniform thickness on the surface of the electrode operating as the discharge electrode.

In such a flat discharge display device, since a sustain electrode for main discharge is arranged on the front glass substrate side, the sustain electrode needs to be formed transparent so as not to interfere with light emission from the fluorescent surface to the front surface.

In addition, in the structure in which the front side and the back side of the planar discharge display device shown in FIG. 3 are reversed, a transmissive planar discharge display device having a fluorescent surface on the front glass substrate has also been put into practical use.

In a patent application (Japanese Patent Application Laid-Open No. 11-80235, Japanese Patent Application Laid-Open No. 11-164292, etc.) relating to the same applicant as the present applicant and the inventor of the present application, a groove is formed in a glass substrate to form a discharge space. A transmissive flat discharge display device using this as a front side glass substrate has also been proposed.

In addition, in the conventional flat discharge display shown in Fig. 3, the sustain electrodes 28 and 29 on the front glass substrate side are required to be close to transparent, which is a big problem in the process. In addition, the formation of the partition wall required a lot of time, which was also a process problem.

On the other hand, although grooves were formed directly on the glass substrate by sandblasting or chemical etching, and attempts were made to form discharge spaces, however, since there was no suitable method for forming electrodes inside the formed grooves, the conventional three-electrode facet In the electrode configuration of a typical flat discharge display device, an address electrode cannot be formed.

Therefore, the present invention can increase the coating amount of the phosphor in the groove, and can efficiently reflect the emitted light of the phosphor from the side surface of the inner wall of the groove to the front side, and the front side glass for display tubes with improved luminance and luminous efficiency. An object of the present invention is to propose a substrate and a planar discharge display device.

In addition, the present invention is to propose a front side glass substrate for a display tube and a planar discharge display device capable of simultaneously improving luminance and contrast.

Disclosure of the Invention

According to the present invention, a plurality of grooves having substantially equal V-shaped cross-sectional shapes on one surface side of the glass substrate and having substantially flat head portions are formed in parallel with each other at regular intervals, and the heads of the plurality of grooves are provided. A front glass substrate for a display tube on which a phosphor layer is deposited on the portions and inner wall surfaces.

According to the present invention, a plurality of grooves having substantially equal V-shaped cross-sectional shapes on one surface side of the glass substrate and having substantially flat head portions are formed in parallel with each other at regular intervals. The phosphor layer is deposited on the wall surface, the width of the substantially flat head is less than half the width of the opening, the height from the opening to the head is larger than the width of the opening, and the gap width between the openings of the adjacent grooves The front side glass substrate for display tubes smaller than half the width of the opening of the groove.

According to the present invention, a plurality of grooves having a substantially V-shaped equivalent cross-sectional shape are formed parallel to each other at regular intervals on one surface side of the glass substrate, and electrode layers are deposited on the head portions of the grooves. A glass substrate for a flat discharge display device in which a phosphor layer is deposited on an inner wall surface and an electrode layer of a plurality of grooves.

According to the present invention, a paste-shaped conductive ink is applied to a plurality of grooves having substantially equal V-shaped cross-sectional shapes formed on one surface side of a glass substrate in parallel with each other at a predetermined interval, A paste of conductive ink is formed, and the paste-shaped conductive ink in the plurality of grooves is dried to sandblast the glass substrate, thereby removing the conductive ink adhering to the inner wall surfaces of the plurality of grooves. A method of forming an electrode of a glass substrate for a flat discharge display device in which a stripe conductive ink is left on a groove portion of a groove, and the remaining stripe conductive ink is sintered to form an electrode.

The present invention is a front glass substrate for a display tube, a flat discharge display device, a low-speed electron fluorescent display device, a field emission fluorescent display device, a cathode ray tube, a light emitting light emitting device for use, a glass substrate for a flat discharge display device, a glass for a flat discharge display device A method of forming an electrode of a substrate, a method of forming an electrode of a glass substrate for a flat discharge display device and a glass substrate for a flat discharge display device.

1 is a perspective view showing a part of a conventional front side glass substrate.

2 is a cross-sectional view of a part of various glass substrates for comparison of the cross-sectional shape of the grooves formed in the glass substrate.

3 is an exploded perspective view of a part of a three-electrode surface discharge type planar discharge display device (PDP) having a conventional reflective fluorescent surface.

4 is a perspective view showing a part of an example of the front glass substrate of the embodiment of the present invention.

Fig. 5 is an enlarged cross-sectional view showing a part of an example of a front side glass substrate of an embodiment of the present invention.

Fig. 6 is an enlarged cross-sectional view showing a part of an example of a front side glass substrate of an embodiment of the present invention.

Fig. 7 is a sectional view showing a part of another example of the front glass substrate of the embodiment of the present invention.

8 is a cross-sectional view showing a part of another example of the front-side glass substrate of the embodiment of the present invention.

Fig. 9 is a sectional view showing a part of another example of the front glass substrate of the embodiment of the present invention.

10 is an enlarged perspective view showing a part of an example of a planar discharge display device (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 type fluorescent display device of the embodiment of the present invention.

12 is a cross-sectional view showing a part of an example of a cathode ray tube of an embodiment of the present invention.

Fig. 13 is an exploded perspective view showing a part of an example of a light emitting tube of an embodiment of the present invention.

Fig. 14 is a sectional view showing a part of an example of a glass substrate for a flat discharge display device of an embodiment of the present invention.

Fig. 15 is a cross sectional process chart showing an example of a method of forming a glass substrate for a flat discharge display device according to the embodiment of the present invention.

Fig. 16 is a sectional view showing a part of another example of the glass substrate for a flat discharge display device of the embodiment of the present invention.

Fig. 17 is a cross sectional view showing another example of the method for forming the glass substrate for a flat discharge display device of the embodiment of the present invention.

18 is an exploded perspective view showing a part of another example of the planar discharge display device (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, the structure of an example of the front side glass substrate for display devices of embodiment of this invention is demonstrated. 4 and 5 are a perspective view and a sectional view of a part of the front glass substrate, respectively. 5 shows the shape of light radiation on the front glass substrate. 6 is an enlarged cross-sectional view showing a portion of FIG.

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

The shape of the light emitted from the phosphor 3 in the groove 2 of any of these cross-sectional shapes will be described with reference to FIGS. 5 and 6. As shown in Figs. 5 and 6, the light from the phosphor 3, for example, the light at the light emitting point 30 of the inner wall surface of the groove 2, is directly front when the inclination angle 16 of the wall surface at this point is small. That is, more light is irradiated toward the wall surface of the adjacent groove 2 than light irradiated above FIG.

The light incident on the wall surface of the adjacent grooves 2 reflects upwards at the interface of the glass, and the light is refracted to the inside of the adjacent grooves 2, that is, the outside of the glass, and reflects downward and is reflected a few times. The light is irradiated to the front side while repeating the reflection. In order to form the groove | channel 2 which satisfy | fills such conditions, not only the cross-sectional shape of the groove | channel 2, but also the distance between the groove | channel 2 and the groove | channel 2 adjacent to this becomes important. So, in order to satisfy this cross-sectional condition further, it demonstrates with reference to FIG. 6 and FIG. 2 mentioned above.

First, the width of the head portion 14 (this is also 14) is narrowed compared to the width of the bottom opening 12 (this is also 12) in order to limit the light emitted directly to the front face from the head portion of the groove 2, and the cross section of the groove 2 is Make the shape close to the V-shape. Of course, the cross section of the side wall surface of the groove 2 does not necessarily have to be straight, but is configured such that the width of the cross section of the groove 2 gradually narrows from the bottom opening 12 toward the head portion 14. Such a groove 2 can be formed by a chemical etching method, but it is easier by the sandblasting method.

In addition, although the angle (tilt angle) 16 between the side wall surface of a groove | channel and the side wall surface of the groove | channel adjacent to the groove | channel is set in a fixed angle range, the distance 13 between the opening part of the bottom part of the groove | channel adjacent to each other is shorter. desirable.

By referring to Fig. 2, the above-mentioned relationship becomes clearer. That is, Fig. 2A shows the cross-sectional shape of the groove of an example of the front side glass substrate of the present invention, and Figs. 2B, 2C and 2D show an example of the cross-sectional shape of the groove of the conventional front side glass substrate. It is a structural example in the case of random formation. Conventionally, the cross-sectional shape of the groove of Fig. 2B or Fig. 2C is good. In this case, the light at the side of the groove hardly goes out to the front side. In addition, since the distance 13 between the opening part of the bottom part of a groove | channel in the case of FIG. 2D is large, the light emitted from the side wall surface of a groove | channel is not reflected in the side wall surface of the adjacent groove | channel.

In the groove of Fig. 2A, which is an example of a groove that satisfies the above-described requirements, in the side wall surface of the groove, a condition for total reflection of the light-rich portion irradiated to the side wall surface of the adjacent groove is front side. Considering that the refractive index of ordinary glass is about 1.5, it can be seen that the inclination angle 16 is about 45 degrees or more when the width 13 between the adjacent grooves is close to zero. However, if the inclination angle 16 exceeds 90 degrees, of course, there is no irradiation to the inner wall surface of the adjacent groove. In addition, since the gap 13 generally has about one half of the bottom opening 12, the inclination angle needs to be slightly smaller than the above-mentioned about 45 degrees. Therefore, the inclination angle 16 is suitably 30 degrees or more and 90 degrees or less, for example.

By the way, when forming a groove having a distance between such a cross-sectional shape and an adjacent groove in the glass substrate, it is difficult to control the angle of the wall surface of the groove in the process, so the width and depth of the pattern of the groove to be formed Predetermined by is preferable. In order to satisfy such a condition, a V-shape which becomes narrow in a straight line from the opening 12 of the bottom of the groove 2 toward the substantially flat head portion 14 upward, and a U-shape that narrows while forming a gentle curve, The width of the portion 14 is less than half of the opening 12 of the bottom, and furthermore, the height from the opening 12 of the bottom to the head 12, i.e., the depth 11 of the groove, is greater than the opening 12 of the bottom, If the gap width 13 is a groove having a cross-sectional shape requiring that the width of the bottom opening 12 be smaller than one-half of the width 12 of the bottom opening 12, as described above, the light at the fluorescent surface is effectively moved to the front side using the maximum wall reflection of the adjacent groove. Is investigated.

Next, with reference to FIG. 7, the structure of another example of the front-side glass substrate for display devices of embodiment of this invention is demonstrated. First, the shape of the groove 2 satisfies the condition of the example of the front glass substrate for display device shown in Figs. Characteristic of the front-side glass substrate for the display device of Fig. 7 is that the light absorption layer 4 such as black is formed on the glass surface of the head portion 12 of the groove 2, and the white surface or the like on the glass surface of the gap between the grooves 2 and 2 adjacent to each other. The light reflection layer 5 of was formed.

The light absorption layer 4 can be easily formed by applying a black pigment with a solvent to precipitate. In addition, when the inner wall surface of each groove 2 is separated and applied to phosphor 3 of luminous color such as red, green, and blue, for example, the pigment of the color corresponding to the phosphor 3 is applied on the inner wall surface of the groove 2, respectively. Although it apply | coats and forms a color filter, it can also be set as the light absorption layer 4 by sticking the pigment of each color of the head part 12 thickly by adjusting the density | concentration at the time of coating of a pigment at that time.

The light reflection layer 5 is formed by applying a white pigment or the like to the glass surface of the gap between the grooves 2 and 2 adjacent to each other by a method such as screen printing. The phosphor layer 3 is formed on the inner wall surface of the groove 2 by screen printing after forming the pigment layer, the light absorption layer 4 and the light reflection layer 5.

The structure of the front side glass substrate 1 in Figs. 4 to 6 and 7 is suitable for application to the front side glass substrate constituting the flat tube body of the flat discharge display device which is a gas discharge tube.

Fig. 10 shows, as an exploded perspective view, an example of the planar discharge display device according to the embodiment of the present invention to which such a front side glass substrate is applied, and the structure of the planar discharge display device is described below. The planar discharge display device is the application of the above-mentioned front side glass substrate to the planar discharge display device of a source (Japanese Patent Application No. 2000-131820) related to the same inventor first proposed by the present application.

In Fig. 10, 1 is a front side glass substrate, and the front side glass substrate 1 has a plurality of grooves 2 of the same cross-sectional shape formed at regular intervals in parallel with each other, in which phosphors 3 are respectively applied on the inner wall surface. Since the groove 2 is formed in this front side glass substrate 1, an electrode cannot be provided in this front side glass substrate 1. For this reason, the necessary electrode is provided as a multilayer electrode on the back side glass substrate 41 side.

In Fig. 10, on the rear glass substrate 41, a plurality of address electrodes 42 having the same width are formed by screen printing or the like so as to be parallel to each other at a predetermined interval. The plurality of address electrodes 42 are disposed so as to face each other and intersect with each other via the insulating layer 43, form an XY matrix to perform display discharge, and have sustain electrodes 44 and 45 arranged in a plurality of alternations, respectively. There is a through hole 46 as a structure which characterizes this flat discharge display device.

This through hole 46 is an effective means for facilitating address discharge. The plurality of sustain electrodes 44 and 45 are covered by the upper dielectric layer 47 as a whole. Therefore, this planar discharge display device is a so-called planar discharge display device of a three-electrode AC type of single substrate type. Therefore, the ultraviolet rays generated by the discharge between the sustain electrodes 44 and 45 are efficiently irradiated to the phosphor layers 3 formed on the inner wall surfaces of the plurality of grooves 2 of the front glass substrate 1, and the light generated from the phosphors 3 is It is reflected by the wall surface of the adjacent groove 2, and irradiated to the front side efficiently in the form which has a some directivity.

Next, with reference to FIG. 8, the structure of another example of the front side glass substrate for display devices of embodiment of this invention is demonstrated. First, the shape of the groove 2 satisfies the conditions in the front glass substrate shown in Figs. The glass substrate 1 on the front side of FIG. 8 has a low-speed electron fluorescent display (VFD) or field emission cathode and has a field emission display (FED: Field Emission Display) rather than a flat discharge display (PDP). It is suitable for the glass substrate on the front side of an electron display device called).

Referring to FIG. 8, a transparent conductive film 6 is deposited 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 indium oxide or the like on the inner wall surface of the groove 2. The transparent conductive film 6 is an electrode for imparting an anode potential to the phosphor layer 3 having equivalent conductivity and accelerating electrons.

Fig. 11 shows an example of the field emission fluorescent display device (FED) according to the embodiment of the present invention to which the front glass substrate 1 of Fig. 8 is applied, and the structure thereof will be described below. A plurality of first electrodes 52 are provided on the back side glass substrate 41, and a plurality of second electrodes 54 intersecting with the plurality of first electrodes 52 through the insulating layer 53 to form an XY matrix. Is installed. Each of these first and second electrodes 52 and 54 intersects through a through hole. On the plurality of first electrodes 52, a cathode layer 55, that is, a needle-like cathode layer, a carbon thin film, or the like, for example, an electric field radiation type, is placed. Then, by applying a voltage between the plurality of electrodes 52 and 54, electrons are emitted from the cathode 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, irradiated to the fluorescent surface 3 on the electrode 6, and the fluorescent surface 3 emits light. Light generated by the phosphor 3 of a certain groove 2 is reflected on the wall surface of the groove 2 adjacent to the groove 2, and is efficiently irradiated to the front side in a form having a certain degree of directivity.

Next, with reference to FIG. 9, another example of the front side glass substrate of embodiment of this invention is demonstrated. The grooves 2 formed in this front side glass substrate 1 satisfy the condition of the grooves 2 of the front side glass substrate 1 of Figs. The glass substrate 1 on the front side of this structure is suitable for application to a high-speed electron-linear fluorescent display device, that is, an electron-linear display device called a cathode ray tube (CRT), or an field-emitting fluorescent display device (FED) having a field emission cathode.

Referring to FIG. 9, the phosphor 3 is coated on the inner wall surfaces of the plurality of grooves 2 of the front glass substrate 1, and the conductive film, that is, the metal film 7 is coated, as the surface of the phosphor 3 is coated. have. The metal film 7 does not necessarily need to be transparent. For example, an aluminum film by vapor deposition is common. In a cathode ray tube (CRT), the metal film 7 is called a metal back layer, and an anode potential for accelerating electrons is given thereto. In addition, the phosphor 3 also reflects the light emitted in the tube.

FIG. 12 shows a conceptual diagram of a part of an example of a cathode ray tube (CRT) of the embodiment of the present invention to which the front side glass substrate of FIG. 9 is applied. In addition, other components of the cathode ray tube (CRT) are omitted, and a shadow mask or aperture grille 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 beam deflecting mechanism such as an electron gun and deflection yoke having a color discriminating function such as an aperture grille is similar to a conventional polar polar tube.

It goes without saying that the front glass substrate 1 may be combined with a structure in which the light absorption layer 4 described with reference to FIG. 7 is added. In addition, among the field emission fluorescent display device FED having the field emission cathode described above, there is also a high-speed electron type similar to that of the cathode ray tube CRT. In that case, the front glass substrate having the structure described with reference to FIG. 9 is suitable.

Next, referring to Fig. 13, the structure of the light emitting tube to which the front side glass substrate explained with reference to Figs. 4 to 6 will be described. This light emitting 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 at both sides of the groove 2 of the front glass substrate 1. In addition, this pair of sustain electrodes is good. In this case, since the pixels do not need to be separated from the light emitting tube, the front glass substrate 1 and the rear glass substrate 41 do not need to be in contact with each other, and the light emitting efficiency is higher at a slightly spaced side.

In Fig. 13, a pair of sustain electrodes 44 and 45 are respectively covered with an upper dielectric layer 47 to form an AC discharge electrode similar to that of a planar discharge display device (PDP). Instead, a pair of coil-shaped hot cathodes can be provided to form an electric discharge light emitting device for illumination.

Hereinafter, with reference to FIG. 14, the structure of the example of the glass substrate for planar discharge display apparatus of embodiment of this invention is demonstrated. Fig. 14 shows a sectional view of the glass substrate. 101 denotes a glass substrate, and a plurality of grooves 102 parallel to each other are formed in the glass substrate 101 so that the cross-sectional shape thereof becomes V-shaped by sandblasting or chemical etching. In this case, the opening width and depth of the groove 102 are set to be approximately equal, for example. When the depth of the groove 102 is deeper than the opening width (V-shaped groove), the sand blasting method is suitable for forming the groove 102. In addition, when the depth of the groove 102 remains more than the opening width (U-shaped groove), either the sandblasting method or the chemical etching method may be used.

Furthermore, the electrode 104 is formed in the head portion 103 of the formed grooves 102. In addition, the formation method of this electrode 104 is mentioned later. Furthermore, 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 104. In addition, although omitted in FIG. 14, the electrode 104 may be covered with a dielectric layer to be configured as a so-called AC electrode.

The glass substrate 101 shown in Fig. 14 is applicable to both the front glass substrate and the rear glass substrate of the flat discharge display device. The structure of the planar discharge display device in the case where the glass substrate 101 shown in Fig. 14 is used as the front glass substrate will be described later. In the case where the glass substrate 101 shown in Fig. 14 is used as the back side glass substrate, a light reflection layer such as white may be formed on the inner wall surface of the groove 102 before the phosphor layer 5 is formed.

In the case where the glass substrate shown in Fig. 14 is used as the front side glass substrate of the planar discharge display device, the phosphor layer 105 coated on the wall surface of the groove 102 is used for discharge from the sustain electrode on the back side glass substrate opposite to this. Is emitted by the ultraviolet rays generated by the ultraviolet rays, and the light is transmitted through the glass substrate 101 to be directly emitted to the front side, and is also reflected on the wall surface of the adjacent groove 102 to be 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 cross-sectional shape of the groove 102 becomes a V-shape, and as described above, the area of the inner wall surface of the groove 102 is wide, so that the phosphor Although the application area of 103 becomes large and the amount of light in fluorescent material 3 is large, since the cross section is V-shaped, fluorescent material 105 on electrode 104 of head part 103 moves away from the discharge part which is an ultraviolet source, and light emission is carried out. Most of this weak, light emission is irradiated from the wall surface of the groove 102 to the wall surface of the groove 102 on both sides, and is reflected thereon and emitted to the front surface. Therefore, even if the electrode 104 is in the head portion 103 of the groove 102, the amount of light emitted is hardly affected. By blackening this electrode 104, external light can be absorbed and the contrast can be improved.

Therefore, the V-shaped cross-sectional shape of the groove 102 not only increases the area of the phosphor on the wall surface of the groove 102, but also has a structure suitable for radiating the emitted light efficiently to the front side. And both contrast can be increased.

Furthermore, when the glass substrate 101 having the structure shown in Fig. 14 is applied to the rear side glass substrate, the glass substrate 101 operates in the same manner as a conventional flat discharge display device having a reflective fluorescent surface, but the process of forming the partition wall is greatly simplified.

Next, with reference to FIG. 15, the formation method of the electrode layer 104 in the groove | channel of the glass substrate of embodiment of this invention is demonstrated. Moreover, although the description of the method of forming the groove 102 itself for the glass substrate 101 is omitted, the sandblasting method is generally suitable.

As shown in Fig. 15, screen printing pastes such as conductive paste ink such as silver and nickel are embedded in the V-shaped grooves 102, and these are dried once. In addition, the screen printing paste may be embedded so as to apply the screen printing paste to the entire inner wall surface of the groove 102, but screen printing is preferable to further increase the uniformity.

If the paste for screen printing is dried, as shown in Fig. 15A, the paste adheres to the entire wall surface of the groove 102, but since the cross section of the groove is V-shaped, it is possible to form a paste in the head portion 103. Do. Therefore, when the wall surface of the groove 102 is removed by the sandblasting method, only the ingot portion of the paste remains.

Thus, by sintering the paste remaining in the groove 102, the electrode layer 104 can be formed in the groove 102 as shown in Fig. 15B.

Furthermore, since the dry conductive paste is easier to be removed by sandblasting than plate glass, it is extremely easy to form the electrode 104 in the shape as shown in Fig. 15B.

In this way, the ingot of the paste can be formed in the head portion 103 by using the V-shaped groove 102. When the paste on the wall surface of the groove 102 is removed by the sandblasting method except for the head portion 103 of the groove 102, an optional mask pattern is formed by using the difference between the hardness of the conductive paste and the glass before sintering after drying. Even if it is not used, it is easy to remove only the conductive paste.

Next, with reference to the sectional drawing of FIG. 16, the structure of the glass substrate for planar discharge display apparatus of embodiment of this invention is demonstrated. First, grooves 102 having a U-shaped cross-sectional shape are formed in the glass substrate 1 by sandblasting or chemical etching. As described above, when the depth of the groove 102 is relatively shallow with respect to the opening width of the groove 102, the groove 102 can be easily formed by the sandblasting method or the chemical etching method. In this case, since the cross-sectional shape in Fig. 15 is closer to flat than the V-shaped groove 102, the second groove 110 is formed here as a groove for forming a fine electrode. Thereafter, the second groove 110 is filled with the conductive ink paste, and the electrode layer 104 is formed by the same method as described above.

In order to efficiently irradiate ultraviolet light in gas discharge to the phosphor 105, when the cross-sectional shape of the groove 102 is V-shaped, the opening width of the groove is 100 to 200 µm and the depth of the groove is similarly about 100 to 200 µm. Suitable for However, in the case where a pixel having an opening width larger than this and forming a relatively large pixel is less effective in making the cross-sectional shape of the groove 102 become V-shaped, the U-shaped groove is more suitable.

Next, referring to FIG. 17, a structural method of the glass substrate for a flat discharge display device described with reference to FIG. 17A, the manufacturing method of the glass substrate of said Embodiment 3 described in 3 is demonstrated. In the glass substrate 101 of Fig. 17A, a U-shaped groove 102 having a cross-sectional shape is formed by a sandblasting method, a chemical etching method, or the like.

First, a mask 111 made of a resin excellent in sandblasting resistance, solvent resistance, or the like is coated on the inner wall surface of the groove 102 so as to cover the inner wall surface of the groove 102. In this case, the printed pattern is matched with the pattern of the wall surface portion of the groove 102, and the printed mask 111 of the resin is printed so that the head 3 of the groove 102 is stripped off.

Then, when the sand blasting method or the chemical etching method is performed in the groove 102, since the mask 111 of the resin is provided, the second groove 110 is formed in the head portion 103 of the groove 102.

Then, as shown in Fig. 17C, as described above, the conductive ink phase 104A is embedded in the second groove 110 and dried, except for the second groove 110 on the inner wall surface of the groove 102. When the ink paste 104A is removed by the sandblasting method, the conductive layer 104 is formed in the second groove 110 as shown in Fig. 17D.

As described above, it is easy to form the second groove 110 in the head portion 103 of the U-shaped groove 102 having a cross-sectional shape, and to form the electrode layer 104 having a fine line width therein.

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

The AC type flat discharge display device uses a plurality of electrode layers 104 formed in the head portions 103 of the plurality of grooves 102 of the glass substrate 101 as a plurality of address electrodes, and a plurality of address electrodes 104 and a plurality of address electrodes 104 on the rear side glass substrate 106. Sustain electrodes 107 and 108 arranged in parallel to each other, which are orthogonal to constitute the XY matrix, are formed in parallel to each other. Furthermore, the plurality of sustain electrodes 107 and 108 are respectively covered with a dielectric layer 109 to form an AC discharge electrode. One is a three-electrode AC type flat discharge display device. In addition, in Fig. 18, the dielectric layer 109 is shown in a state in which a portion of the dielectric layer 109 is peeled off.

The sustain electrodes 107 and 108 on the back side glass substrate 106 are easily formed by screen printing conductive paste inks such as silver and nickel and firing them. In addition, as in the conventional three-electrode planar discharge display device, either one of the sustain electrodes 107 or 108 forms an XY matrix and an address electrode 104 facing each other, and the other sustain electrode is common to each pixel. It is connected and used only for sustain discharge.

These pairs of sustain electrodes 107 and 108 are AC-type electrodes whose surfaces are covered with a dielectric layer 109, and whose surfaces are covered with a protective layer such as magnesium oxide. 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 above-described cross-sectional groove having a V-shaped groove is shown as the front side glass substrate. In the front glass substrate 101, a U-shaped groove may be formed in the cross-sectional shape.

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. In addition, although the display contrast of the planar discharge display device can be increased by blackening the electrode layer 104, before forming the electrode layer 104, a color filter corresponding to each emission color is formed on the groove 102 by applying pigments of respective colors to the contrast and the contrast. The color purity can be improved.

Furthermore, Fig. 18 is a three-electrode surface discharge type flat discharge display device having a transmissive fluorescent surface with a fluorescent surface on the front side, but the front glass substrate 101 and the rear glass substrate 106 are replaced with electrodes 107 and 108 formed of transparent electrodes. In this way, a three-electrode surface discharge type flat discharge display device having a reflective fluorescent surface can be constituted.

In a three-electrode surface discharge type flat discharge display device having a transmissive fluorescent surface employing a front glass substrate having a V-shaped or U-shaped groove having a cross-sectional shape, sustain discharge is performed with a sustain electrode on the rear glass substrate side. The ultraviolet rays excite the fluorescent surface in the groove of the front glass substrate. The emitted light is irradiated to the transparent glass portions between the grooves, and most of the light is reflected to the wall surface of the adjacent grooves and exits to the front side. The portion of the electrode which acts as an address electrode in the head portion of the groove does not pass the emitted light from the phosphor, but as shown in Fig. 18, when the cross-sectional shape of the groove is V-shaped, the emission of this portion is originally weak. Therefore, the influence on the luminance is small, and the effect of improving the contrast of the planar discharge display device is increased. In the case where the groove has a U-shaped cross section, the pixel is relatively large, so that the width of the electrode is made thin so that the influence on luminance is small.

Claims (30)

On one surface side of the glass substrate, a plurality of grooves having an approximately V-shaped equivalent cross-sectional shape and having substantially flat head portions are formed in parallel with each other at a predetermined interval, A front side glass substrate for a display tube, wherein a phosphor layer is deposited on the head and inner wall surfaces of the plurality of grooves. 2. The cross section of the plurality of grooves according to claim 1, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And a gap width between the openings of the grooves is smaller than half the width of the openings of the grooves. The front side glass substrate for a display tube according to claim 1 or 2, wherein a light absorption layer is formed on the head portion of the plurality of grooves. The front side glass substrate for a display tube according to claim 1 or 2, wherein a light reflection layer is formed in a gap between the openings of the plurality of grooves adjacent to each other. The light absorbing layer is deposited on the head portion of the plurality of grooves, and a light reflection layer is formed on the gap between the openings adjacent to each other of the plurality of grooves. A front side glass substrate for a display tube, characterized in that. 3. The front side glass substrate for a display tube according to claim 1 or 2, wherein a transparent conductive layer is deposited on the head portion and the inner wall surface of the plurality of grooves under the phosphor layer. The front side glass substrate for a display tube according to claim 1 or 2, wherein a light reflection conductive layer is deposited on the phosphor layer. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A front glass substrate for a display tube on which an phosphor layer is deposited on an inner wall surface; Having a back side glass substrate having an address electrode and a sustain electrode, And a flat tube body filled with gas is formed in the front glass substrate and the rear glass substrate. 9. The cross section of the plurality of grooves according to claim 8, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is smaller than half the width of the openings of the grooves. The display type discharge display device according to claim 8 or 9, wherein a light absorption layer is formed on the head portions of the plurality of grooves. 10. The display type discharge display device according to claim 8 or 9, wherein a light reflection layer is formed in a gap between the opening portions of the plurality of grooves adjacent to each other. The light absorbing layer is deposited on the head portion of the plurality of grooves, and a light reflection layer is formed on the gap between the openings adjacent to each other of the plurality of grooves. Display type discharge display device characterized in that. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A phosphor layer is deposited on the inner wall surface, and a transparent conductive layer to which an anode potential for electron acceleration is applied is deposited on the head portion and the inner wall surface of the plurality of grooves below the phosphor layer. Glass substrate, An electrode including a cathode and a pixel selection control gate has a back-side glass substrate deposited thereon; A low-speed electron beam fluorescent display device, characterized in that a flat tube is formed in the front glass substrate and the rear glass substrate. 14. The cross section of the plurality of grooves according to claim 13, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is less than half the width of the openings of the grooves. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A phosphor layer is deposited on the inner wall surface, and a transparent conductive layer, to which an anode potential for electron acceleration is applied, is deposited on the head portion and the inner wall surface of the plurality of grooves under the phosphor layer. Glass substrate, An electrode including a cathode and a pixel selection control gate has a back-side glass substrate deposited thereon; And the flat glass body is formed on the front glass substrate and the rear glass substrate. The cross section of the plurality of grooves, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is smaller than half the width of the openings of the grooves. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A phosphor layer is deposited on the inner wall surface, and a front side glass substrate on which the light reflection conductive layer to which an anode potential for electron acceleration is applied is deposited on the phosphor layer; Has a back side glass substrate having an electron gun and an electron beam deflection means; Cathode ray tube, characterized in that the tubular body is configured in the front glass substrate and the rear glass substrate. The cross section of the plurality of grooves according to claim 17, wherein the width of the head portion is less than or equal to half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And a gap width between openings of the grooves is smaller than half of the width of the openings of the grooves. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A phosphor layer is deposited on the inner wall surface, and a front side glass substrate on which the light reflection conductive layer to which an anode potential for electron acceleration is applied is deposited on the phosphor layer; Has a back side glass substrate having an electron gun and an electron beam deflection means; The front emission substrate and the rear substrate, the field emission fluorescent display device, characterized in that the tubular body is configured. 20. The cross section of the plurality of grooves according to claim 19, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is smaller than half the width of the openings of the grooves. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A front glass substrate having a phosphor layer deposited on an inner wall surface; A rear glass substrate having a pair of coil-shaped hot cathodes positioned at both ends of the plurality of grooves, Discharge light emitting device for illumination, characterized in that the tubular body is configured in the front glass substrate and the rear glass substrate. 22. The cross section of the plurality of grooves according to claim 21, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is smaller than half of the width of the openings of the grooves. On one surface side of the glass substrate, a plurality of grooves having an approximately V-shaped equivalent cross-sectional shape are formed parallel to each other at a predetermined interval, Electrode layers are deposited on the head portions of the plurality of grooves, And a phosphor layer is deposited on the inner wall surfaces of the plurality of grooves and the electrode layer. Paste-shaped conductive ink is applied to a plurality of grooves having a substantially V-shaped equivalent cross-sectional shape formed parallel to each other at a predetermined interval on one surface side of the glass substrate, and the paste is applied to the head portion of the plurality of grooves. A lump of conductive ink of the shape is formed, Drying the paste-shaped conductive ink in the plurality of grooves, By sandblasting the glass substrate, the conductive ink adhering to inner wall surfaces of the plurality of grooves is removed, A stripe conductive ink remains on the head portions of the plurality of grooves, A method of forming an electrode of a glass substrate for a flat discharge display device, characterized by sintering the remaining stripe conductive ink to form an electrode. On one surface side of the glass substrate, a plurality of first grooves having substantially U-shaped equivalent cross-sectional shapes are formed in parallel with each other at a predetermined interval, A second groove is formed in each head portion of the plurality of first grooves, While electrode layers are deposited in the plurality of second grooves, respectively, And a phosphor layer is deposited on the inner wall surfaces of the plurality of first grooves and the electrode layer. On one surface side of the glass substrate, a portion is covered with a mask except for the head portions of the plurality of first grooves having substantially U-shaped equivalent cross-sectional shapes formed in parallel with each other at a predetermined interval, A second groove is formed in the head portion of each of the plurality of first grooves through the mask by sandblasting or chemical etching, The paste-shaped conductive ink is applied into the plurality of second grooves by applying a paste-shaped conductive ink over the second grooves and the second grooves of the head portion of each of the plurality of first grooves. Form a lump of blood, Drying the conductive ink in the second grooves in the plurality of first grooves and in the head portion of each of the plurality of first grooves, Sant blasting the glass substrate removes the conductive ink adhering to inner wall surfaces of the plurality of grooves, A stripe conductive ink is left in the plurality of second grooves, A method of forming an electrode of a glass substrate for a flat discharge display device, characterized by sintering the remaining stripe conductive ink to form an electrode. On one surface side of the glass substrate, a plurality of grooves having a substantially V-shaped equivalent cross-sectional shape are formed parallel to each other at a predetermined interval, and an electrode layer as an address electrode is deposited on the head portion of the grooves. A front glass substrate having a phosphor layer deposited on the inner wall surfaces of the plurality of grooves and the electrode layer; A rear side glass substrate having a pair of sustain electrodes parallel to each other forming an XY matrix crossing the plurality of address electrodes and an AC type discharge electrode serving as a dielectric layer covering the pair of sustain electrodes; And a flat tube body filled with gas is formed in the front glass substrate and the rear glass substrate. On one surface side of the glass substrate, a plurality of first grooves having substantially U-shaped equivalent cross-sectional shapes are formed in parallel with each other at a predetermined interval, and a second portion of each of the plurality of first grooves Grooves are formed, and electrode layers serving as address electrodes are deposited in the plurality of second grooves, and phosphor layers are deposited on inner wall surfaces of the plurality of first grooves and the electrode layers, respectively. Substrate, A rear side glass substrate having a pair of sustain electrodes parallel to each other forming an XY matrix crossing the plurality of address electrodes and an AC type discharge electrode serving as a dielectric layer covering the pair of sustain electrodes; And a flat tube body filled with gas is formed in the front glass substrate and the rear glass substrate. On one surface side of the glass substrate, a plurality of grooves having substantially equal V-shaped cross sections and having substantially flat head portions are formed in parallel with each other at regular intervals, and the head portions of the plurality of grooves and A front glass substrate on which an phosphor layer is deposited on an inner wall surface; A back side glass substrate having a pair of AC-type discharge electrodes positioned at both ends of the plurality of grooves, An electric discharge light emitting device for illumination, characterized in that a tubular body is formed in the front glass substrate and the rear glass substrate. The cross section of the plurality of grooves, wherein the width of the head portion is less than half the width of the opening portion, and the height from the opening portion to the head portion is larger than the width of the opening portion and adjacent to each other. And the gap width between the openings of the grooves is smaller than half of the width of the openings of the grooves.