JP2000208061A - Glass substrate and plasma display panel(pdp) - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass substrate capable of easily defining the relations with a mating member by providing a glass substrate body and an engaging projection with the mating member that is bonded to the surface of the substrate body and to provide a PDP. SOLUTION: An engaging projection 11 is bonded to the surface 4a of a glass substrate body 4 interposing a binder layer 12 formed of glass containing paste. The engaging projection 11 preferably has the same level of a thermal expansion coefficient as the glass substrate body 4. This obviates the need of forming a cut-out part or a hole in the substrate body, and eliminates the possibility of damage due to the concentration of stress. No change is needed for the manufacturing processes of the substrate body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass substrate used for a display panel such as a liquid crystal display, a plasma display, an electroluminescence display and the like, and a plasma display panel.

[0002]

2. Description of the Related Art For example, a plasma display panel (hereinafter simply referred to as a PDP) is a flat display panel utilizing light emission accompanying gas discharge, and it is possible to provide a memory function to the panel itself. In recent years, the panel structure is simple and suitable for enlargement, and the slide image can be projected from the back surface using the transparency of the panel and superimposed on the display of the PDP (so-called superimposed display is possible). , Is rapidly spreading.

A display panel of this type is connected to, for example, an FPC (fl
For connection to an exible printed circuit), an anisotropic conductive film that allows current to flow only in the thickness direction is sandwiched between the opposing surfaces of the two, and the two are bonded through this anisotropic conductive film. Have been done. That is, the anisotropic conductive film is made of a material in which conductive particles such as C and Ni are dispersed in an adhesive. Secure state.

However, there is a case where the display panel is displaced from the FPC at the time of joining. In this case, it is necessary to remove the FPC from the display panel and reconnect. However, when the FPC is peeled off, the transparent electrode provided on the surface of the display panel may be peeled off from the display panel. Since the display panel from which the transparent electrode has been peeled cannot be used, it is discarded. For this reason, the production yield was low and the production cost was high.

Therefore, a mark is displayed on the FPC and the display panel, and the FPC and the display panel are aligned with each other while detecting whether or not the positions of these marks match each other with an optical sensor ( For example, 5-6
No. 5065).

[0006]

In this case, even if the displacement can be accurately detected, the work of positioning so as not to be misaligned is a delicate manual operation, and it takes much time and effort to perform the positioning. On the other hand, in order to position the FPC, a notch or hole for positioning is provided in the FPC,
No notch or hole for positioning can be provided in the glass substrate of the display panel. This is because the glass may be broken by local stress concentration.

In some cases, it is necessary to provide a portion of the glass substrate not only for positioning but also for engaging with a counterpart member. The present invention has been made in view of the above problems, and has as its object to provide a glass substrate and a PDP capable of easily defining a relationship with a counterpart member.

[0008]

Means for Solving the Problems As means for solving the problems to achieve the above object, the aspect of the invention described in claim 1 is as follows.
It is characterized by comprising a glass substrate main body, and an engagement projection for a counterpart, which is joined to the surface of the substrate main body. In this aspect, the engagement protrusion is joined to the surface of the glass substrate main body, and the function of defining the relationship with the counterpart member, such as positioning, can be achieved using the engagement protrusion. Since there is no notch or hole in the glass substrate body, there is no risk of breakage due to stress concentration. Also, there is no need to make any changes to the manufacturing process of the substrate body.

According to a second aspect of the present invention, in the first aspect, the thermal expansion coefficient of the engaging projection is in the range of 90 to 110% of the thermal expansion coefficient of the substrate body. . In this embodiment, the thermal expansion coefficient A of the engagement projection is set to a level substantially equal to the thermal expansion coefficient B of the substrate body (90% ≦ A / B
≦ 110%), the bonding strength can be increased. In addition, it is more preferable that the range of 95% ≦ A / B ≦ 105% is satisfied.

According to a third aspect of the present invention, in the first or second aspect, the engaging projection is made of glass. In this aspect, since the engagement protrusion and the substrate main body are made of the same type of material, the joining strength between the two can be further increased. According to a fourth aspect of the present invention, in the third aspect, the engaging projection and the substrate main body are bonded via a paste containing glass. In the present aspect, since the paste containing glass is used, the higher the degree of adhesion, the higher the degree of adhesion, and the higher the bonding strength, as it fits well with the engagement protrusion and the substrate body.

According to a fifth aspect of the present invention, there is provided the first aspect.
(2) or (3), wherein the engaging projection constitutes a positioning means for positioning a counterpart member connected to the substrate main body with respect to the substrate main body. In this aspect, by engaging the engagement projection as the positioning means with the counterpart member, the substrate main body can be easily and reliably positioned with respect to the counterpart member. This allows
The yield can be improved, and the manufacturing cost can be reduced.

According to a sixth aspect of the present invention, there is provided a plasma display panel including the glass substrate according to any one of the first to fifth aspects. The plasma display (PDP) can be increased in size to the extent that it is difficult for ordinary display devices. However, a large panel needs to be connected to many connectors or FPCs for each block along the periphery. If any one of a large number of connectors is displaced at the time of connection, the whole will be defective. On the other hand, in the present embodiment, even when a large number of connections are made, the displacement can be reliably prevented, so that the large panel is not wasted.
The production rate of PDP can be reduced by increasing the yield.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic plan view showing a state in which a PDP as an element including a glass substrate according to an embodiment of the present invention is connected to an FPC via a connector, and FIG. 2 is a cross-sectional view of the PDP.

Referring to these figures, PDP 1 has a large number of small holes 2 in a matrix (for example, a grid interval of 0.5 mm).
And the first and second glass substrates 4 and 5 sandwiching the spacer 3 from both sides. Spacer 3 and first and second glass substrates 4 and 5
Mixed gas mainly containing Ne (containing a small amount of Xe, Ar, etc.) in a large number of minute discharge cells 10 partitioned by
Is sealed, for example, at 100 to 500 Torr.

Further, the first glass substrate 4 includes a substrate body 4
a, a large number of first transparent electrodes 6 joined to the outer surface 4b of the substrate main body 4a and extending in the vertical direction in a row, and an engagement protrusion 11 described later. Similarly, the second glass substrate 5 includes a substrate body 5a and an outer surface 5b of the substrate body 5a.
And a plurality of second transparent electrodes 7 joined in a row and extending in the horizontal direction, and an engagement protrusion 11 described later. PD
In a plan view of P1, the first and second transparent electrodes 6, 7
Are orthogonal to each other at the position of the cell 10.

When an AC voltage (sustain voltage) lower than the discharge start voltage is applied to all the cells 10, the cells that have started discharging by the write pulse voltage once have the positive and negative wall charges generated at that time. Discharge light is emitted every half cycle of the alternating current and stored and displayed. The luminance is proportional to the frequency of the alternating current, and halftone display is possible. The first transparent electrode 6 is connected to the FPC 9 via a plurality of connectors 8 arranged on a pair of edges 1a and 1b of the PDP 1 facing the direction in which the transparent electrode 6 extends (vertically in FIG. 1). Similarly, the second transparent electrode 7 is connected to the FPC 9 via a plurality of connectors 8 arranged on a pair of edges 1c and 1d of the PDP 1 facing in the direction in which the transparent electrode 7 extends (in FIG. 1, the lateral direction). I have. The connector 8 for connecting the first transparent electrode 6 and the connector 8 for connecting the second transparent electrode 7 are used face down with respect to each other.

In FIG. 1, reference numeral 11 denotes the position of each glass substrate 4, 5 with respect to each connector 8, that is, the PDP 1
Are engaging projections as positioning means for positioning the positioning. A pair of engagement projections 11 is provided corresponding to each connector 8. As shown in FIGS. 3A and 3B, which are cross-sectional views of the main parts of each glass substrate, the engagement projections 11 are provided on the outer surfaces 4b, 5a of the substrate bodies 4a, 5a of the glass substrates 4, 5.
b through a binder layer 12.

The coefficient of thermal expansion of the engagement projection 11 is preferably in the range of 90 to 110% of the coefficient of thermal expansion of the glass substrates 4 and 5. That is, the thermal expansion coefficient A of the engagement protrusion 11 is set to a level (90
% ≦ A / B ≦ 110%), the bonding strength can be increased. In addition, 95% ≦ A / B ≦ 105%
Is more preferably within the range.

Therefore, if the engaging projections 11 are made of glass, the engaging projections 11 and the substrate bodies 4a, 5a are made of the same kind of material, and the joint strength of the two 11 and 4a, 5a is further improved. Can be enhanced strongly. Further, it is preferable to use a paste containing glass as the binder layer 12. In this case, as the engagement projection 11 and the substrate bodies 4a and 5a are substantially integrated, the higher the degree of adhesion, the higher the bonding strength, and the higher the bonding strength.

Next, referring to FIGS. 4, 5 and 6,
Connection mechanism of PDP as element including glass substrate and P
The connector 8 constituting the holding mechanism of the DP has an FPC on one side.
A connector main body 14 that defines a first receiving cavity 50 that receives the end of the PDP 9 and a second receiving cavity 13 that receives the end 1a of the PDP 1 is provided on the other side. FIG.
7, first receiving cavity 50 is formed between first surface 51 of main body 15 of connector main body 14 and inner surface 53 of cover 52 rotatably supported at one end of main body 15. A partition is formed between them. When the cover 52 is swung, the open position raised substantially perpendicular to the main body 14 as shown in FIG. 4 and the first surface of the main body 14 as shown in FIGS. It is displaced to a closed position facing 51. Numeral 54 denotes side walls integrally formed on the main body portion 14 so as to define both side portions of the first receiving cavity 50.
4 is provided with engagement grooves 57 that elastically engage with engagement protrusions 56 formed on both side edges 55 of the cover 52 to hold the cover 52 in the closed position.

In FIG. 6, reference numeral 58 denotes a plurality of contact members which are arranged in parallel in the width direction (longitudinal direction) of the main body 14, and as shown in FIG.
Numeral 8 is accommodated in each of the accommodation grooves 59 formed in the main body 14, and extends perpendicularly from one end of the main body 60 to the main body 60, and is retained in the accommodation groove 59 to hold itself. Piece 6
1, a first contact portion 62 having an L-shaped resilient branching from the vicinity of the base end of the holding piece 61, and a second contact portion 6 extending orthogonally from the other end of the main body 60.
And 3. The first contact portion 62 is exposed at the back of the main body portion 51 as shown in FIG. 6, and is formed at the end of the FPC 9 inserted into the first receiving cavity 50 as shown in FIG. The electrical continuity is ensured by making elastic contact with each of the conductive patterns. Further, the second contact portion 63 is electrically connected to the first or second transparent electrode 6, 7 of the PDP 1 inserted into the second receiving cavity 13 via a thin metal wire 26 of an elastic member 23 described later. Connected. As a result, as shown in FIG.
The conductor of the FPC 9 inserted into the PDP 1 is connected to the corresponding first or second transparent electrode 6, 7 of the PDP 1 via the corresponding contact member 58 and the corresponding thin metal wire 26 of the elastic member 23.
Will be electrically connected to the

Referring to FIG. 5, FIG. 6 and FIG.
At both ends of 5, an engagement recess 64 is formed to engage with the engagement protrusion 11 of the PDP 1 inserted into the receiving cavity 13. As shown in FIG. 9, the engagement projection 11 engages with the engagement recess 64, so that the PDP 1 is accurately positioned at the proper insertion position, and the PDP 1 is prevented from being detached from the connector 8. .

On the other hand, as shown in FIGS. 4 and 7, the second receiving cavity 13 has a main body 15 of the connector main body 14 and a cover as a pressing member having a base end 17 connected to one end 16 of the main body 15. 18 is formed. Cover 18
Is formed integrally with the main body portion 15 by resin molding, and between the open position shown in FIGS. 4, 5 and 6 and the closed position shown in FIGS. Is rotatable. A projection 20 is formed on an inner surface 19 near the base end 17 of the cover 18. As shown in FIG. 7, the projection 20 abuts on the second surface 21 of the main body 15 at right angles while the cover 18 is in the closed position, and the cover 18 is closed as shown in FIGS. 7, 8 and 9. Position.

Further, since the cover 18 is formed integrally with the connector body 14 by the base end 17 (constituting the urging means) of the R shape, the cover 18 is elastically urged toward the open position. The manufacturing cost can be reduced as compared with the case where components are provided. Note that the projection 20 is
And abut on the inner surface 19 of the cover 18. Reference numeral 22 denotes a positioning rib formed on the main body 15, and the positioning rib 22 abuts on the end face 1b of the PDP 1 inserted into the receiving cavity 13, thereby defining the PDP 1 at a regular insertion position.

The second surface 21 of the main body 15 elastically contacts the surface of the end 1a of the PDP 1 inserted into the receiving cavity 13, corresponding to the entrance to the receiving cavity 13, and
Elastic member 23 holding the end 1a of the first member 1 in the receiving cavity 13.
Is held. The elastic member 23 is accommodated in an accommodation hole 24 that extends long in a width direction (a direction orthogonal to the paper surface in FIGS. 4, 7, and 9) formed on the second surface 21.
A part protrudes from the receiving hole 24 into the receiving cavity 13.

The elastic member 23 is shown in FIGS. 10 (a) and 10 (b).
As shown in FIG. 2, the rubber sheet 25 includes an insulating rubber sheet 25 and a thin metal wire 26 as a conductive material extending along the thickness direction of the rubber sheet 25. The thin metal wires 26 are arranged in a matrix in a direction perpendicular to the thickness direction. The arrangement pitch P of the thin metal wires 26 is, for example, 0.5 mm.

Both ends of the fine metal wire 26 are projected from both sides of the rubber sheet 25 by a minute amount so as to be in contact with the transparent electrodes 7 and 8 of the PDP 1 and the second contact portion 63 of the contact member 58 so as to ensure conduction. is there. Rubber sheet 25
Examples of the material include silicone rubber. Silicone rubber has high electrical insulation properties, and it is possible to arrange thin metal wires at a narrow pitch. Further, since it is flexible, even if it is pressed against the glass substrates 4 and 5, it will not be damaged. In addition, since the compression restoring property is high, the holding force on the glass substrates 4 and 5 after detachment does not decrease. Further, since it has excellent heat resistance, it can be suitably used as a mechanism for holding the glass substrates 4 and 5 of the display panel such as the PDP 1 which becomes relatively hot. In addition, as the thin metal wire 26, as shown in FIG. 11, an example in which a gold coating 28 formed by plating on the surface of a brass wire 27 can be exemplified. If the brass wire 27 is used, the electric resistance is small and the wire can be thinned. Further, by providing the gold coating 28 on the surface, the electric resistance can be further reduced.

As shown in FIG. 5, a pair of support stays 29 are provided at both ends in the width direction of the second surface 21 of the main body 15.
The driving member 31 of the toggle mechanism 30 for opening and closing the cover 18 is swingably supported by the pair of support stays 29.
4 and 7, the toggle mechanism 30 includes a cover 1
8 comprises a leaf spring 33 as an elastic member disposed to face the outer surface 32 and the driving member 31 described above. The leaf spring 33 functions as a lever that presses and biases the cover 18. That is, the first end 34 of the leaf spring 33 contacts the base end 17 of the cover 18 to form the fulcrum A, and the leaf spring 33
The second end 35 abuts on the distal end 36 of the cover 18 to form an action point B. A flange 37 extends outwardly orthogonally from a tip end 36 of the cover 18, and a second end 35 of the leaf spring 33 is received by a corner formed by the cover 18 and the flange 37.

The driving member 31 has a substantially L-shape, and is supported by the pair of support stays 29 via a support shaft 38 so as to be swingable about the support shaft 38. The driving member 31 has a pressing portion 39 and a finger operating portion 40 arranged on both sides of the support shaft 38. When the finger operation unit 40 is swung with a finger, the position of the force point C at which the pressing unit 39 presses the leaf spring 33 is changed, so that a well-known toggle function is performed.
The pressing portion 39 presses the leaf spring 33 in accordance with the inverted posture of the finger operation portion 40 as shown in FIG.
The finger operating section 40 has a second pressing surface 42 that presses the leaf spring 33 in a supine position as shown in FIG.

In this embodiment, the first and second receiving cavities 5 are opened with the covers 52 and 18 open as shown in FIG.
Insert the respective ends of the FPC 9 and the PDP 1 into 0,13. At this time, the engagement protrusions 11 included in the PDP 1
Are engaged with the engaging recesses 64 of the connector body 14 as shown in FIG. 9 to accurately position the PDP 1 with respect to the connector 8. Next, the covers 52 and 18 are closed, and FIG.
The ends of the FPC 9 and the PDP 1 are held in the corresponding receiving cavities 50 and 13 as shown in FIG.

By using the engagement projections 11 joined to the substrate bodies 4a and 5a of the glass substrates 4 and 5 included in the PDP 1, a positioning function with respect to the connector 8 and a function of preventing the glass substrate 4 from coming off from the connector 8 can be achieved. . In particular, the glass substrates 4 and 5, that is, the PDP 1 can be easily and reliably positioned with respect to the connector 8. Thereby, the yield can be improved and the manufacturing cost of PDP 1 can be reduced. Further, even when a large panel is used and a large number of connections are made, a connection without positional displacement can be ensured, so that the large panel is not wasted. As a result, the yield rate is increased and the manufacturing cost of the PDP 1 is increased. Can be significantly reduced.

In particular, since there are no cutouts or holes in the glass substrate bodies 4a and 5a, there is no risk of breakage due to stress concentration. Also, there is no need to make any changes to the manufacturing process of the substrate bodies 4a, 5a. Note that the present invention is not limited to the above embodiment, and various changes can be made within the scope of the present invention.

[0033]

According to the first aspect of the present invention, the engagement projection is joined to the surface of the glass substrate main body, and the function of defining the relationship with the counterpart member, for example, positioning, using this engagement projection. Can be fulfilled. Since there is no notch or hole in the glass substrate body, there is no risk of breakage due to stress concentration. Also, there is no need to make any changes to the manufacturing process of the substrate body.

According to the second aspect of the present invention, the joining strength can be increased by setting the thermal expansion coefficient A of the engagement projection to a level substantially equal to the thermal expansion coefficient B of the substrate body. According to the third aspect of the present invention, since the engagement protrusion and the substrate main body are made of the same kind of material, the joining strength between the two can be further enhanced. According to the fourth aspect of the present invention, since the paste containing glass is used, the paste can be easily joined to the engagement protrusion and the substrate main body, and the joining strength can be further increased.

According to the fifth aspect of the present invention, by engaging the engaging projection as the positioning means with the counterpart member,
The substrate body can be easily and reliably positioned with respect to the counterpart member. As a result, the yield can be improved and the manufacturing cost can be reduced. According to the sixth aspect of the present invention, even when a large-sized panel is used and a large number of connections are made, it is possible to secure a connection without displacement, so that the large-sized panel is not wasted. It is possible to increase the manufacturing cost of the PDP.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a state in which a PDP as an element including a glass substrate according to an embodiment of the present invention is connected to an FPC via a connector.

FIG. 2 is a sectional view of a PDP.

FIGS. 3A and 3B are cross-sectional views of main parts of each glass substrate included in a PDP.

FIG. 4 is a sectional view of the connector with each receiving cavity opened.

FIG. 5 shows a connector with each receiving cavity opened and a P to be mounted.
It is an exploded perspective view of DP.

FIG. 6 is a perspective view of the connector as viewed from a direction opposite to that of FIG. 5;

FIG. 7 is a cross-sectional view of the connector showing a state in which each cover is closed and ends of the FPC and the PDP are held.

FIG. 8 is a perspective view of the connector with each cover closed.

FIG. 9 is a side view of the connector with each cover closed and an FPC and a PDP mounted thereon.

10A and 10B are a plan view and a sectional view of an elastic member for elastically contacting a transparent electrode of a glass substrate of a PDP to secure conduction.

FIG. 11 is an enlarged cross-sectional view of a thin metal wire included in an elastic member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PDP 1a End part 4 1st glass substrate 5 2nd glass substrate 4a, 5a Substrate main body 4b, 5b Outer surface 6 1st transparent electrode 7 2nd transparent electrode 8 Connector (connection mechanism, holding mechanism) 9 FPC 11 Engaging projection 13 second receiving cavity 14 connector body 64 engaging recess

Claims (6)

[Claims] 1. A glass substrate comprising: a substrate body made of glass; and an engagement projection, which is joined to a surface of the substrate body, for engaging with a counterpart. 2. The glass substrate according to claim 1, wherein the coefficient of thermal expansion of the engagement projection is in a range of 90 to 110% of the coefficient of thermal expansion of the substrate main body. 3. The glass substrate according to claim 1, wherein said engaging projection is made of glass. 4. The glass substrate according to claim 3, wherein said engaging projection and said substrate main body are bonded via a paste containing glass. 5. The glass substrate according to claim 1, wherein said engaging projections constitute positioning means for positioning a counterpart member connected to the substrate main body with respect to the substrate main body. 6. A plasma display panel comprising the glass substrate according to claim 1.