JPH10268791A - Flat type display device and method of manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an area of a region which does not contribute to displaying of a flat type display device. SOLUTION: A transference electrode 16 is formed on an upper surface and end face of a lower glass substrate 15. On a substrate 11 for terminals, a same number of electrodes 20 are formed at positions corresponding to plural transparent electrodes 16 on the end face of the glass substrate 15. An adhesive 14 contains conductive particles 19, and when the substrate 11 for terminals is pressed against a side face of a liquid crystal panel for compressing the adhesive 14 and baked, the transparent electrode 16 on the end face 15a of the lower side glass substrate 15 is electrically connected with the electrodes 20 of the substrate 11 for terminals by the conductive articles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flat display device such as a liquid crystal display device and a method for manufacturing the same.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as display devices for personal computers, word processors or large display devices. In order to use a liquid crystal display device as a display device, it is necessary to provide a terminal for externally supplying a driving voltage of the liquid crystal.

FIG. 11A is a view showing the structure of a connection portion of a conventional liquid crystal panel, and FIG. 11B is a view showing the structure of A in FIG.
It is a figure which shows the -A cross section. As shown in FIGS. 1A and 1B, transparent electrodes 103 and 104 are formed on opposite surfaces of two glass substrates 101 and 102, respectively. A region where the transparent electrodes 103 and 104 of the glass substrates 101 and 102 intersect is a display area, and a region where the transparent electrode is formed on only one side is a terminal area 105 and 106 for electrically connecting to an external driving circuit. Become. On the outside of the display area, glass substrates 101 and 102 are bonded to form a liquid crystal 11.
A liquid crystal sealing seal 107 for enclosing “0” is applied. Further, the polarizing plate 108, 1
09 is pasted.

[0004]

In a conventional liquid crystal display panel, a region for applying a sealant for bonding two glass substrates is provided outside a display area, and an external drive circuit is provided outside the region. It is necessary to form the terminal portions 105 and 106 for connection, and the ratio of the area of the region not contributing to the display to the entire area of the liquid crystal panel is large, and the external dimensions of the device incorporating the liquid crystal panel are correspondingly large. Had become. In addition, since the width outside the display area is required to some extent, the design of the display unit is limited.

Further, when a large-sized display device is constructed by arranging liquid crystal display devices and the like in a matrix, terminals and the like that do not contribute to display exist between display areas of adjacent liquid crystal display devices. However, there is a problem that an image is cut and displayed, and display quality is impaired. These problems were the same in other flat display devices other than the liquid crystal display device.

An object of the present invention is to reduce a region which does not contribute to display of a flat display device.

[0007]

According to a first aspect of the present invention, there is provided a flat display device in which a pair of substrates on which transparent electrodes are formed are arranged to face each other, an electrode electrically connected to the transparent electrodes is formed on an end face of the substrate. The terminal substrate is fixed to the substrate so that the terminal substrate is arranged in a direction perpendicular to the substrate and the electrode is electrically connected to the corresponding electrode on the end surface of the substrate.

According to the first aspect of the invention, the terminal substrate is arranged in a direction perpendicular to the display surface of the flat display device, and a driving voltage can be supplied to the flat display device from the electrodes of the terminal substrate. Therefore, it is not necessary to provide an electrode for connecting to the driving circuit outside the display area of the flat display device as in the related art, and the area of a region that does not contribute to display can be reduced. Accordingly, when a large number of flat display devices are arranged to form a large display device, the area of a region that does not contribute to display in the peripheral portion of an adjacent display device is reduced, so that images are continuously displayed, and a flat image is displayed. The display quality of the type display device is improved.

According to a second aspect of the present invention, there is provided a flat display device in which a pair of substrates on which transparent electrodes are formed are arranged to face each other, and the ends of the substrates are electrically connected to the transparent electrodes formed on one side of the substrates. Apply a conductive material.

According to the second aspect of the present invention, since the conductive material electrically connected to the transparent electrode of the substrate is applied to the end of the substrate, for example, the electrode of the terminal board for connection is perpendicular to the substrate. By pressing or adhering to the conductive material in the direction in which the electrodes are driven, the electrodes for supplying the driving voltage of the flat panel display device can be pulled out in the direction perpendicular to the display surface. Therefore, it is not necessary to draw out the electrodes outside the display area, and the area of a region that does not contribute to display can be reduced.

According to a third aspect of the present invention, there is provided a flat display device in which a pair of substrates on which transparent electrodes are formed are arranged to face each other, a transparent electrode is formed on one surface of the substrate, and an electrode is formed on a peripheral portion of the other surface. The peripheral electrode is electrically connected to the transparent electrode by a through hole, and the peripheral electrode is used as a connection terminal for supplying a driving voltage to the flat panel display.

According to the third aspect of the present invention, the driving voltage of the liquid crystal can be supplied by vertically connecting the connection terminals such as pins to the electrodes on the peripheral portion of the other surface of the substrate. There is no need to extend the electrodes to the outside, and a region that does not contribute to display can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B are diagrams showing the structure of a connection portion of a liquid crystal panel (liquid crystal display device) according to the first embodiment, and FIGS. 2A and 2B are diagrams of FIG. A-A
It is sectional drawing and its enlarged view.

As shown in FIGS. 1A and 1B, the terminal substrates 11 and 12 are provided on the right side of the liquid crystal panel 13 and the front side in FIG. 1
4 bonded together. The adhesive 14 is applied to the liquid crystal 21
Sealing material. As shown in FIGS. 2A and 2B, the lower glass substrate 15 has a plurality of transparent electrodes 16 formed on an upper surface and an end surface 15a, and the upper surface and the transparent electrodes on the end surface 15a are electrically connected. . A transparent electrode 18 is formed on the lower surface of the upper glass substrate 17 and on an end surface (not shown) on the near side in FIG. The terminal substrate 11 has a plurality of transparent electrodes 16 on the end face of the glass substrate 15.
The same number of electrodes 20 are formed at positions corresponding to. The adhesive 14 contains conductive particles 19, and when the terminal substrate 11 is pressed against the side surface of the liquid crystal panel 13 to compress the adhesive 14, the transparent electrode 16 on the end surface 15 a of the lower glass substrate 15 and the terminal The electrodes 20 of the substrate 11 are electrically conductive particles 19
As a result, they are electrically connected in the direction of arrow a in FIG. At this time, since there are no conductive particles 19 that connect the transparent electrode 16 and the electrode 20 next to the terminal substrate 11, the transparent electrode 16 and the electrode 20 next to the terminal substrate 11 are not electrically connected. . That is, the conductive particles 1 of the adhesive 14
9, conductivity is obtained only in a specific direction, and the transparent electrode 16
And only the corresponding electrode 20 of the terminal substrate 11 is electrically connected. The other transparent electrodes 16 on the glass substrate 15 and the other electrodes 20 on the terminal substrate 11 are similarly electrically connected.

When heated in this state, the adhesive 14 is cured, and the terminal substrate 11 is bonded in a direction orthogonal to the lower glass substrate 15, and the transparent electrode 16 of the glass substrate 15 and the corresponding terminal substrate 11 correspond to each other. The electrode 20 is electrically connected. As a result, all the transparent electrodes 16 on the glass substrate 15 are connected to the corresponding electrodes 20 on the terminal substrate 11, so that a connection portion for supplying a drive voltage to the liquid crystal panel 13 is perpendicular to the display surface. Can be withdrawn.

Similarly, the terminal substrate 12 is adhered to the upper glass substrate 17 in a direction orthogonal to the display surface, and the transparent electrode formed on the end face of the glass substrate 17 and the terminal substrate 1 are formed.
Two corresponding electrodes are electrically connected. When the adhesive 14 is cured, the polarizing plate 2 is placed on the upper and lower glass substrates 15 and 17.
Paste 2,23.

The substrate used for the liquid crystal panel 13 is not limited to a glass substrate, but may be a plastic substrate, a film substrate, a ceramic substrate, or a combination of these substrates. The electrodes formed on the end surfaces of the glass substrates 15 and 17 are not limited to transparent electrodes, but may be conductive materials such as copper and carbon. Also, the terminal substrates 11 and 12
, A liquid crystal display driver IC or the like is mounted thereon, and the liquid crystal panel 13 can be driven.

Here, an outline of a conventional manufacturing process of the liquid crystal panel 13 will be described with reference to FIG. First, pattern processing is performed on a glass substrate on which an IT0 film is formed, and a transparent electrode is formed on one surface of each glass substrate (FIG. 3, FIG.
(1)). Next, an alignment film is printed on two glass substrates (2), and after baking the alignment film (3), a rubbing process is performed to align liquid crystal molecules (4). A sealing material is printed on one side of the glass substrate and pre-baked (5). Next, a spacer for securing a gap when two glass substrates are stacked is applied to one glass substrate (6). Next, two glass substrates on the COM side and the SEG side are overlaid (7). The two glass substrates are bonded with a sealant by pressure baking or UV irradiation (8). After the liquid crystal is injected from the injection hole, the injection hole is sealed (9). A polarizing plate is attached to a glass substrate (10). Finally, the liquid crystal panel is driven to perform a lighting test. In the light scattering type LCD, the step of attaching a polarizing plate is not required.

Next, the manufacturing process of the first embodiment is shown in FIG.
This will be described with reference to FIG. In the first step, the transparent electrode 16 is formed on one side and the end face 15a of the glass substrate 15 (FIG. 4).
(1)). The second to fourth steps are the same as the conventional manufacturing method. In a fifth step, a spacer is applied. Next, the two glass substrates 15 and 17 are overlaid and temporarily fixed (6). An anisotropic conductive adhesive (also serving as a sealant) 14 is applied to the periphery of the liquid crystal panel 13 and the end face 15a (7). The terminal substrates 11 and 12 are
3 is attached in a direction orthogonal to the display surface (8). The adhesive 14 is baked or cured by UV irradiation while the terminal substrates 11 and 12 are pressed against the liquid crystal panel 13 (9). The liquid crystal 2 is inserted through the injection hole at the corner of the liquid crystal panel 13.
1 is injected and sealed (10). Subsequent steps are the same as the conventional one.

In the first embodiment, the glass substrate 15
A transparent electrode 16 is formed on an end face 15a of the
The terminal substrate 11 is bonded in the direction perpendicular to the direction with an adhesive 14 also serving as a sealant, and the transparent electrode 16 is electrically connected to the corresponding electrode 20 of the terminal substrate 11 by the adhesive 14 having conductive anisotropy. doing.

Thus, the electrodes 16 on the glass substrate 15 can be drawn out in a direction perpendicular to the display surface of the liquid crystal panel 13. Therefore, it is not necessary to provide an electrode for driving the liquid crystal panel 13 outside the display area of the liquid crystal.
Since the useless area that does not contribute to the display can be reduced, the outer dimensions of the liquid crystal panel 13 can be reduced with the same display area. Further, when the liquid crystal panels 13 are arranged in a matrix to form a large display screen, the area of a region that does not contribute to the display of the adjacent liquid crystal panels 13 can be reduced, so that an image may be cut and displayed. And the display quality is improved.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to (A) and (B) and the process chart of FIG.
In the manufacturing process of the second embodiment, the process up to the injection of the liquid crystal 21 is the same as the conventional process (9) in FIG. When the steps of liquid crystal injection and sealing in FIG. 3 are completed, a conductive ink 33 made of a carbon paste, a silver paste, an ITO paste, or the like is applied to the transparent electrodes 34 in accordance with the electrode pitch of the two glass substrates 31 and 32. (FIG. 6 (10)). next,
The conductive ink 33 is cured by baking or curing treatment (11), and thereafter, the polarizing plates 22 and 23 are attached (1).
2). Lighting inspection is performed by mechanically connecting the terminals of the drive circuit to the conductive ink 33 electrically connected to the transparent electrode 34 (13).

FIGS. 5A and 5B show the structure of the connecting portion when the terminal substrates 34 and 35 are brought into mechanical contact with the liquid crystal panel 33 manufactured as described above, and the A- FIG.

As shown in FIG. 5B, the conductive ink 33
Is applied so as to contact the transparent electrode 34 of the lower glass substrate 31 and protrude from the end surfaces of the glass substrates 31 and 32. The electrode 36 of the terminal substrate 35 is made to have, for example, a structure having elasticity (clip, etc.), and a pressure for pressing the electrode 36 of the terminal substrate 34 against the side surface of the glass substrate 31 is applied. LCD panel 3
3, the electrode 36 of the terminal substrate 34 is electrically connected to the transparent electrode 34 of the glass substrate 31 via the conductive ink 33. That is, the transparent electrode 34 of the lower glass substrate 31 can be pulled out in a direction perpendicular to the display surface. Upper and lower glass substrates 31, 3
2 is adhered by a liquid crystal sealing seal 38.

Similarly, for the upper glass substrate 32,
The conductive ink 33 is electrically connected to the transparent electrode 37, and the conductive ink 33 is electrically connected to the electrode 40 of the terminal board 39. Thereby, the transparent electrode 37 of the upper glass substrate 32 can be pulled out in a direction perpendicular to the display surface.

In the above-described embodiment, the electrode 36 of the terminal board 35 has a structure having elasticity. However, the present invention is not limited to such a structure. For example, a pattern serving as an electrode is formed on the terminal substrate 35, and the electrode is bonded to the conductive ink 33 with a conductive anisotropic adhesive or the like, so that the electrode 36 of the terminal substrate 35 and the transparent electrode 34 of the glass substrate 31 You may make it electrically connect. The terminal substrate 35 is not limited to a glass substrate, but may be a glass epoxy substrate, a plastic substrate,
A ceramic substrate, a film substrate, or the like can be used.

Next, the manufacturing process of the liquid crystal panel 51 according to the third embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. First, the transparent electrodes 56 and 59 are formed on the upper and lower peripheral portions of the glass substrate 53 (FIG. 7).
(1)). Next, a through hole 52 is provided in the peripheral portion, and the transparent electrode 56 on the upper surface and the transparent electrode 59 on the peripheral portion on the lower surface are electrically connected by the through hole 53 (2). Subsequent steps execute the same steps as (2) and subsequent steps of the manufacturing steps of the first embodiment in FIG. However, in this case, the attachment of the terminal substrate and the pressure baking step are not required.

FIGS. 8A and 8B are views showing the structure of the connecting portion of the liquid crystal panel 51 manufactured as described above. Outside the display area, through holes 52 are provided corresponding to the number of the transparent electrodes 56 and 58. A liquid crystal sealing seal 55 is provided at the end of each of the glass substrates 53 and 54.
Is applied. Transparent electrodes 56 and 59 are formed on the upper and lower peripheral portions of the lower glass substrate 53, and through holes 52 are formed in the transparent electrodes 56 and 59. A conductive member is formed in the through hole 52 by vapor deposition, plating, or the like, or is filled with the conductive member, and electrically connects the upper and lower transparent electrodes 56 and 59.

Similarly, for the upper glass substrate 54,
Transparent electrodes 58 are formed on the lower surface (the liquid crystal side) of the glass substrate 54 and on the periphery of the upper surface, and the upper and lower transparent electrodes 58 are electrically connected by the through holes 52. Then, although not shown, a conductive pin or the like is brought into contact with the transparent electrode on the upper surface of the glass substrate 54, and the pin is bent downward in FIG. Can be supplied.

As another realization method, the upper glass substrate 5
A transparent electrode may be formed on the periphery of the lower surface (the liquid crystal side) of 4, and a conductive pin or the like may be connected to the transparent electrode. In this case, since there is no need to form a transparent electrode in the peripheral portion of the upper surface, the through hole 52 becomes unnecessary.

The transparent electrode 5 on the lower surface of the glass substrate 53
The connection between 6 and the drive circuit is not limited to metallic contacts such as pins 57, but may be a film substrate or a film-like wiring cord.

In the third embodiment, the liquid crystal panel 5
1 can be drawn out in a direction perpendicular to the display surface of the liquid crystal panel 51.
The proportion occupied by the dimension of the portion not contributing to the display among the external dimensions of the liquid crystal panel can be reduced.

FIG. 9 is a sectional view of a liquid crystal panel 61 according to a fourth embodiment of the present invention in which electrical connection can be made from the lower surface of a glass substrate 62 by pins or the like. A transparent electrode 6 is provided on the upper, end and lower peripheral portions of the lower glass substrate 62.
3 are formed. A liquid crystal sealing seal 55 is applied to the ends of the glass substrates 62 and 64. The transparent electrode 65 is formed on the lower surface and the peripheral portion of the upper glass substrate 64.

In the fourth embodiment as well, the direction of drawing out the electrodes for supplying the driving voltage to the liquid crystal panel 61 can be made perpendicular to the display surface, so that the area occupied by the electrode portions that do not contribute to the display can be reduced. .

Next, FIG. 10 is a diagram showing a portable terminal device using a conventional liquid crystal panel and a portable terminal device using the liquid crystal panel according to the embodiment of the present invention. In the conventional portable terminal device 71, it is necessary to provide a connection portion for connecting to a drive circuit outside the display area of the liquid crystal panel 72. Therefore, the external dimensions of the device are increased by at least the width a of the connection portion of the liquid crystal panel. I needed to.

On the other hand, in the portable terminal device 73 using the liquid crystal panel of the embodiment, the connection with the drive circuit can be made in the direction perpendicular to the display surface, so that the portion which does not contribute to the display of the liquid crystal panel is provided. And the external dimensions of the device can be reduced accordingly.

In the portable terminal device 74 having a structure in which the two liquid crystal screens 75 and 76 can be folded, the area of a connection portion for connecting the left liquid crystal screen 75 and the right liquid crystal screen 76 to a drive circuit is reduced. Since the size can be reduced, images on the left and right screens can be displayed as continuous images.

FIGS. 11A and 11B are diagrams showing an example of a large-sized display device in which a plurality of liquid crystal panels 81 according to the embodiment are arranged. Since the electrodes for connecting the liquid crystal panel 81 to the driving circuit can be drawn out perpendicular to the display surface, the area of a portion that does not contribute to display can be reduced. Therefore, even when a large-sized display device is configured by arranging a large number of liquid crystal panels 81, images are less likely to be cut off at the boundaries of the liquid crystal panels 81, and display quality can be improved.

In the above-described embodiment, the present invention is applied to a liquid crystal display device. However, the present invention is not limited to this case. (ELC), can be widely applied to flat display devices such as fluorescent display tubes.

[0040]

According to the present invention, since the area of a region which does not contribute to the display of the flat display device can be reduced, the external dimensions of the device incorporating the flat display device can be reduced accordingly. Further, in the case where a large-sized display device is configured by arranging a plurality of flat display devices, the area of a portion that does not contribute to the display of the boundary between adjacent display devices is reduced, so that images are continuously displayed and displayed. The quality is further improved.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a structure of a connection portion of a liquid crystal panel according to a first embodiment.

FIG. 2A is a sectional view taken along line AA, and FIG. 2B is an enlarged view thereof.

FIG. 3 is a view showing a conventional manufacturing process of a liquid crystal panel.

FIG. 4 is a diagram illustrating a manufacturing process of the liquid crystal panel according to the first embodiment.

FIG. 5A is a diagram showing a structure of a connection portion of a liquid crystal panel according to a second embodiment, and FIG. 5B is a cross-sectional view thereof.

FIG. 6 is a diagram illustrating a manufacturing process of the liquid crystal panel according to the second embodiment.

FIG. 7 is a diagram illustrating a manufacturing process of the liquid crystal panel of the third embodiment.

FIG. 8A is a diagram showing a structure of a connection portion of a liquid crystal panel according to a third embodiment, and FIG. 8B is a cross-sectional view thereof.

FIG. 9 is a sectional view of a liquid crystal panel according to a fourth embodiment.

FIG. 10 is a diagram showing a portable terminal device using a conventional liquid crystal panel and a portable terminal device using the liquid crystal panel of the embodiment.

FIG. 11 illustrates an example of a large-sized display device.

FIG. 12A is a diagram showing a structure of a connection portion of a conventional liquid crystal panel, and FIG. 12B is a cross-sectional view thereof.

[Explanation of symbols]

 11, 12 Terminal substrate 13 Liquid crystal panel 14 Adhesive 15, 17 Glass substrate 16, 18 Transparent electrode

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kaichi Yabe 1776 Yanoguchi, Inagi-shi, Tokyo Fujitsu Kiden Co., Ltd. (72) Inventor Hiroaki Kusama 1776 Yanoguchi, Inagi-shi, Tokyo Fujitsu Kiden Co., Ltd. (72) Inventor Yoshikazu Hisayama 1776 Yanoguchi, Inagi-shi, Tokyo Fujitsu Electric Co., Ltd.

Claims (16)

[Claims] 1. A flat-panel display device in which a substrate on which a transparent electrode is formed is arranged to face each other, wherein an electrode electrically connected to the transparent electrode is formed on an end face of the substrate, and is arranged in a direction orthogonal to the substrate. And a terminal substrate is fixed to the substrate such that the electrode is electrically connected to a corresponding electrode on an end face of the substrate. 2. The flat display device according to claim 1, wherein said flat display device is a liquid crystal display device. 3. The flat display device according to claim 1, wherein the flat display device is one of a plasma display, a field emission display, an electrochromic display, an electroluminescence display, and a fluorescent display tube. 4. An electrode on the end face of the substrate is a transparent electrode, and the transparent electrode on the end face of the substrate and the electrode on the terminal board are bonded with an anisotropic conductive adhesive. 4. The flat panel display according to 3. 5. The flat display device according to claim 1, wherein the adhesive also functions as a sealant. 6. A flat display device in which a substrate on which a transparent electrode is formed is opposed to a substrate, wherein a conductive material is applied to an end of the substrate so as to be electrically connected to a transparent electrode formed on one surface of the substrate. A flat panel display characterized by being applied. 7. An electrode of a terminal substrate arranged in a direction perpendicular to the substrate is electrically connected to a transparent electrode of the substrate via the conductive material. 7. The flat panel display according to 6. 8. The flat display device according to claim 7, wherein an electrode of said terminal substrate is pressed against said conductive material. 9. An electrode on the terminal substrate is bonded to the conductive material by an anisotropic conductive adhesive, and the electrode is electrically connected to a corresponding transparent electrode on the substrate. The flat panel display according to claim 7, wherein 10. The flat panel display according to claim 9, wherein the electrodes of the terminal substrate are conductive patterns formed on the terminal substrate. 11. A flat-panel display device in which a pair of substrates on which transparent electrodes are formed are opposed to each other, wherein an electrode electrically connected to a transparent electrode formed on one surface of the substrate is formed on an end surface and the other surface. A flat-panel display device formed in a peripheral portion and using the electrode in the peripheral portion as a connection terminal for supplying a driving voltage of the flat-panel display device. 12. A flat display device having a pair of substrates on which a transparent electrode is formed facing each other, wherein a transparent electrode is formed on one surface of the substrate, and an electrode is formed on a peripheral portion of the other surface. A flat display device, wherein a transparent electrode and the peripheral electrode are electrically connected by a through hole, and the peripheral electrode is used as a connection terminal for supplying a driving voltage of the flat display device. 13. A pair of substrates on which said transparent electrodes are formed are glass, plastic, film or ceramic substrates, or a combination of said substrates. , 11 or 12
13. The flat display device according to claim 1. 14. A step of forming a transparent electrode on one side and an end face of a pair of substrates facing each other, a step of overlapping the pair of substrates while maintaining a predetermined gap, and a step of forming conductivity in a specific direction on an end face of the substrate. A step of applying an adhesive having, and a step of adhering the electrodes of the terminal substrate so that electrical connection can be obtained only with a corresponding electrode on an end face of the substrate via the adhesive in a direction orthogonal to the substrate. And a step of pressing and curing the adhesive. 15. A step of forming a transparent electrode on one surface of a pair of substrates facing each other, a step of overlapping the substrates while maintaining a predetermined gap, and a step of electrically connecting the substrates to the transparent electrodes of the substrate. Applying a conductive material to the end of the flat display device. 16. The method according to claim 14, wherein the flat display device is a liquid crystal display device.