JPH11231329A - Electrooptic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity and to facilitate detachment of a display panel from a plastic case at the time of repair or the like. SOLUTION: A TFT liquid crystal display panel 120 which has a picture display area 113 in the part where a TFT array substrate (element substrate) 20 and a counter substrate joined to each other overlay each other is mounted on a plastic case 200 with an adhesive between them. In this case, an adhesive 300 hardened by ultraviolet rays is dotted with at prescribed intervals in the peripheral direction between the outer peripheral part of the display panel 120 and the inner peripheral part of the plastic case 200 to joint the display panel 120 and the plastic case 200 to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a panel having an electro-optical material between a pair of substrates, and more particularly to an electro-optical device having a panel and a case.

[0002]

2. Description of the Related Art In a liquid crystal display panel, liquid crystal is sealed between an element substrate and an opposing substrate disposed opposite to the element substrate via a square annular sealing material. The counter substrate is
Usually, the liquid crystal display area is smaller than the element substrate and has substantially the same contour as the sealing material, and the inside of the overlapping portion between the element substrate and the counter substrate is the liquid crystal display area.

On the surface of the element substrate protruding from the peripheral edge of the opposing substrate, facing the opposing substrate, various driving circuits, wirings, and the like are provided. After assembling, the liquid crystal display panel having such a configuration is mounted on a plastic case through a predetermined inspection.

As shown in FIG. 10, the plastic case has an opening a substantially at the center, and an inner peripheral portion of the opening a has a first portion corresponding to the protruding portion c of the element substrate b. Are formed, and a second step f corresponding to the peripheral edge of the counter substrate e is formed.

When the liquid crystal display panel h is mounted on the plastic case g, a silicone adhesive i is applied to the entire inner surface of the first step d corresponding to the inner periphery of the plastic case g. Thereafter, the liquid crystal display panel h is mounted on the plastic case g from the side of the opposing substrate e, the peripheral edge of the opposing substrate e is supported by the second step f, and the element substrate b is supported by the first step d. , And the adhesive i is cured in this state.
Thus, the plastic case g and the liquid crystal display panel h are connected to each other via the adhesive i.

After such coupling, a polarizing plate and a hook (both not shown) having an opening corresponding to the liquid crystal display area are attached to the upper surface side of the element substrate b, whereby the liquid crystal display panel h is attached to the plastic case g. Is completed.

[0007]

The silicone adhesive i is used as the adhesive because of the difference in the coefficient of thermal expansion between the plastic case g and the liquid crystal display panel h made of quartz or the like. This is because when the case g expands and contracts, the stress acting on the liquid crystal display panel h is relieved by the soft silicone adhesive i, and the adhesive is applied to the entire inner periphery of the plastic case g. The reason for applying is to secure the necessary strength by bonding the plastic case g and the liquid crystal display panel h over the entire surface because the silicon-based adhesive i has a low strength.

However, in the above-mentioned conventional casing mounting structure of the liquid crystal display panel, the silicone adhesive i
Long time to cure adhesive (about 6 hours)
And the production efficiency is reduced.

If it is found that dirt or the like is attached to the liquid crystal display panel h when attaching the polarizing plate, the liquid crystal display panel h is replaced with a plastic case g for repair.
It is necessary to remove the liquid crystal display panel h from the conventional liquid crystal display panel casing mounting structure because the plastic case g and the liquid crystal display panel h are adhered over the entire surface in the circumferential direction. Is time-consuming.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can improve the productivity and can easily remove the display panel from the plastic case at the time of repair or the like. It is an object of the present invention to provide a casing mounting structure.

[0011]

According to an aspect of the present invention, there is provided an electro-optical device comprising a panel having a pair of electro-optical materials between substrates, and a case accommodating the panel. An optical device, wherein the display panel and the case are in close contact with each other by dispersing an ultraviolet curable adhesive in a circumferential direction between an outer peripheral portion of one surface of the panel and an inner peripheral portion of the case. It is characterized by.

According to this means, since an ultraviolet-curing adhesive having immediate curability is used as the adhesive, the curing time of the adhesive can be greatly reduced, and the production efficiency can be improved. . In this case, since the UV-curable adhesive has a hard property after curing, the required strength can be sufficiently secured even when the UV-curable adhesive is scattered, and furthermore, due to such scatter, the case and the case can be secured. Even if stress is applied to the display panel due to a difference in thermal expansion coefficient from the display panel,
The stress can be reduced in a space between the ultraviolet curable adhesives that are adjacent to each other in the circumferential direction.

[0013] Further, since the case and the display panel are connected via an adhesive scattered in the circumferential direction, the panel can be easily removed from the plastic case at the time of repair or the like. Since the ultraviolet curable adhesive has excellent interfacial peeling property, the adhesive attached to the case or the panel can be easily removed after the panel is removed from the case.

An electro-optical device according to a second aspect is the first aspect.
In the panel, the panel has a rectangular shape, and the ultraviolet curable adhesive is applied to three places, that is, a substantially central portion of one side of each of the opposite sides of the panel and both corners of the other side. It is characterized by being scattered.

According to this means, since the lines connecting the ultraviolet curable adhesives scattered at three places become triangular (truss), the bonding strength between the case and the panel can be made higher. .

[0016]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

First, the TFT liquid crystal display panel 120 will be described with reference to FIGS. As shown in FIG. 7, a rectangular TFT array substrate (first substrate) 2
A sealing material 101 is provided along the edge of the reference numeral 0, and a light-shielding peripheral partition 102 made of, for example, the same or different material as the black matrix 109 is provided inside the sealing material 101 in parallel. The data line driving circuit 103 and the mounting terminals 10 are provided outside the sealing material 101.
4 are provided along one side of the TFT array substrate 20, and the scanning line driving circuit 105 is provided along two sides adjacent to the one side. Further, the TFT array substrate 20
A plurality of wirings 106 for connecting the scanning line driving circuits 105 provided on both sides of the screen display area 113 are provided on the remaining side.

The four corners of the sealing material 101 are provided with TFTs.
A silver point 107 made of a conductive material for providing electrical continuity between the array substrate 20 and the opposing substrate (second substrate) 108 is provided. In the drawing, reference numeral 205 denotes an FPC (flexible printed circuit board) connected to the mounting terminal 104.

As shown in FIG. 8, the sealing material 1 is formed smaller than the TFT array substrate 20 shown in FIG.
A rectangular counter substrate 108 having substantially the same outline as that of the counter substrate 01 is joined to the TFT array substrate 20 via the sealing material 101. At the time of bonding, the inside of the peripheral partition 102 at the portion where the TFT array substrate 20 and the counter substrate 108 overlap each other is defined as a screen display area 113.

The data line driving circuit 103 and the scanning line driving circuit 105 are electrically connected to a data line as a source electrode and a scanning line as a gate electrode (both not shown) via wiring. Data line drive circuit 10
An image signal converted into a format that can be immediately displayed from a control circuit (not shown) is input to the scanning line driving circuit 1.
The data line driving circuit 103 sends a signal voltage corresponding to the image signal to the data line (source electrode) in accordance with the step 05 in which the gate voltage is sequentially sent to the scanning line in a pulsed manner.

In this embodiment, in particular, since the TFT 111 is a p-Si (polysilicon) type TFT,
The data line driving circuit 1 is formed in the same process when the TFT 111 is formed.
03 and the scanning line driving circuit 105 can be formed, which is advantageous in manufacturing.

Referring to FIG. 9, an example of an assembling process of the TFT liquid crystal display panel 120 will be briefly described. After receiving and cleaning the TFT array substrate 20 and the opposing substrate 108 as the element substrates, the two substrates 20, 108 An alignment film such as polyimide or polyvinyl alcohol is formed on the surface of the substrate, and then rubbed on the surface of the alignment film using a cloth material such as rayon or nylon. In addition, you may wash after rubbing.

Next, the above-described sealing material 101 is formed on the TFT array substrate 20 by screen printing or the like, and silver dots 107 as a conductive material are applied.

Next, the two substrates 20 and 108 are
After performing the alignment such as the cell gap, the substrates 20 and 10 are applied with a certain pressure.
8 is crimped.

Next, when the sealing material 101 has photocurability, it is cured by irradiating light, and after the curing, the liquid crystal 112 is injected between the two substrates 20, 108. Is sealed with a sealing material 110. Thus, the assembly of the TFT liquid crystal display panel 120 is completed. After the assembly is completed, the TFT liquid crystal display panel 120 is cleaned and then subjected to a predetermined inspection.
For example, it is mounted on a plastic case 200.

Here, in this embodiment, the TFT liquid crystal display panel 120 is mounted on the plastic case 200 as follows.

FIG. 1 is an explanatory perspective view for explaining an example of an embodiment according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 4 to 6 are process diagrams for explaining a method of mounting the TFT liquid crystal display panel 120 on the plastic case 200.

The plastic case 200 has a rectangular plate shape, and has a rectangular opening 201 at a substantially central portion.
Are formed. The opening 201 has substantially the same shape as the contour of the image display area 113 described above. Opening 20
1 has a counter substrate 10 of the TFT array substrate 20
8 corresponding to a portion 202 protruding from the peripheral portion of the counter substrate 8, and a second step portion 203 corresponding to the peripheral portion of the counter substrate 108.
Of the plastic case 20
0 are sequentially formed from the upper surface to the lower surface. Also,
Step t between first step 203 and second step 204
Is set smaller than the thickness of the counter substrate 108.
In the drawing, reference numeral 206 denotes a notch formed on one of the short sides facing each other of the plastic case 200 so that the FPC 205 connected to the mounting terminal 104 can be inserted. The bottom of the notch 206 is substantially flush with the bottom of the first step 203.

In order to mount the TFT liquid crystal display panel 120 on the plastic case 200, first, on both surfaces of the TFT liquid crystal display panel 120, the polarizing plates 2 with back adhesive are used.
08 and 301 are attached, and the FPC 205 is attached to the mounting terminals 104 by ACF crimping, and the crimped portion is reinforced with a UV-curable adhesive (not shown). Then, FIG.
As shown in (1), an ultraviolet curable adhesive 300 is applied to the inner surface of the first stepped portion 203 corresponding to the inner peripheral portion of the plastic case 200 at three places at predetermined intervals in the circumferential direction. Here, the application position of the ultraviolet curable adhesive 300 is determined at both corners (two locations) of the short side of the plastic case 200 on the side where the cutout portion 206 is formed, and the other side. At the approximate center (one location) of the short side of.

Next, as shown in FIG. 2 and FIG.
The counter substrate 108 of the T liquid crystal display panel 120 is placed on the lower side, and in this state, the peripheral edge of the counter substrate 108 is mounted on the second step portion 204 from above the plastic case 200. At the time of mounting, the peripheral portion of the counter substrate 108, and eventually the TFT liquid crystal display panel 120, is supported by the second step portion 204. Meanwhile, the protruding portion 202
(The peripheral portion of the TFT array substrate 20) has a step t between the first step 203 and the second step 204 smaller than the thickness of the counter substrate 108, as described above. Since the bottom surface is disposed above the bottom surface of the first step portion 203, the bottom surface of the protruding portion 202 is not in contact with the first step portion 203 on the entire surface. As shown in FIG. 2, between the outer peripheral portion of the protruding portion 202 and the inner surface of the first step portion 203 and the protruding portion 2
The space between the bottom surface of the second step portion 02 and the bottom surface of the first step portion 203 is filled with the ultraviolet curable adhesive 300, and in the uncoated portion of the ultraviolet curable adhesive 300, as shown in FIG.
Between the outer peripheral portion of the protruding portion 202 and the inner side surface of the first step portion 203 and the bottom surface of the protruding portion 202 and the first step portion 20
A gap 207 is formed between the bottom and the bottom of No.3.

After the TFT liquid crystal display panel 120 is mounted on the plastic case 200 via the ultraviolet-curable adhesive 300, as shown in FIG. To cure.

The spot UV light irradiating device 302 has three UV optical fibers 304 attached to the lower surface side of a head 303 driven up and down corresponding to the application position of the above-mentioned ultraviolet curable adhesive 300. Also, the head 303
A shaft 304 is inserted through the center of the head 303 so as to be movable in the axial direction with respect to the head 303.
A UV light shielding plate 306 having an outline corresponding to the sealing material 101 is connected to a lower end portion of the reference numeral 5. This UV shielding plate 3
Reference numeral 06 also serves as a pressing member for the TFT liquid crystal display panel 120. A compression coil spring 307 is externally inserted on a shaft 305 between the head 303 and the UV light shielding plate 306.

Then, after setting the plastic case 200 coated with the ultraviolet curing adhesive 300 as described above at a predetermined position below the spot UV light irradiation device 302, the head 303 and the shaft 305 are lowered, and the UV
The liquid crystal sealing area 1 of the TFT array substrate 20 is formed by the light shielding plate 306.
Hold down 13a.

Next, the head 303 is further lowered to 3
The UV optical fibers 304 are made to face the application positions of the three UV-curable adhesives 300 described above, and in this state, ultraviolet rays are irradiated to cure the UV-curable adhesives 300. Thereby, the plastic case 200 and the TFT
The liquid crystal display panel 120 is joined to the liquid crystal display panel 120 via the ultraviolet curable adhesive 300, and the mounting of the TFT liquid crystal display panel 120 on the plastic case 200 is completed.

At the time of ultraviolet irradiation, the UV light shielding plate 30
6, the liquid crystal sealing area 113a of the TFT liquid crystal display panel 120 is pressed and shielded from light, so that the ultraviolet rays are prevented from adversely affecting the liquid crystal 112. Also, U
When pressing the TFT liquid crystal display panel 120 with the V light shielding plate 306, only the urging force of the compression coil spring 307 is applied to the TFT liquid crystal display panel 120 so that the TFT liquid crystal display panel 120 is not overloaded.

In the electro-optical device having such a configuration, as an adhesive for bonding the plastic case 200 and the TFT liquid crystal display panel 120, a quick-curing ultraviolet-curing adhesive 30 is used.
Since 0 is used, the curing time of the adhesive can be significantly reduced as compared with the conventionally used silicon-based adhesive, and the production efficiency can be improved.

Here, since the UV-curable adhesive 300 has a hard property after being cured, the required strength can be sufficiently secured even by the point bonding, and the plastic case 200 and the TFT liquid crystal can be secured by the point bonding. Even if stress acts on the TFT liquid crystal display panel 120 due to a difference in thermal expansion coefficient from the display panel 120, the stress is relieved in the space between the ultraviolet curable adhesives 300 adjacent to each other in the circumferential direction. Can be.

Also, the plastic case 200 and the TF
Since the T liquid crystal display panel 120 is connected via an adhesive scattered in the circumferential direction, the TFT liquid crystal display panel 120 can be easily removed from the plastic case 200 at the time of repair or the like. Since the UV curable adhesive 300 is excellent in interfacial peeling property, after removing the TFT liquid crystal display panel 120 from the plastic case 200, the case 200 and the TFT liquid crystal display panel 120 are removed.
Adhesive adhered to the can be easily removed.

Furthermore, since the lines connecting the ultraviolet curable adhesives 300 scattered at three places form a triangle (truss), a high bonding strength between the plastic case 200 and the TFT liquid crystal display panel 120 can be obtained. Obtainable.

In the above-described embodiment, the TFT liquid crystal display panel 120 is taken as an example of the display panel. However, the present invention is not limited to this, and liquid crystal display panels other than the TFT liquid crystal display panel 120 or electro-optical materials other than liquid crystal are used. It is needless to say that the present invention can be applied to a panel having.

[0041]

As is apparent from the above description, according to the first aspect of the present invention, the bonding strength between the case and the panel is secured, and the stress acting on the panel due to the difference in the coefficient of thermal expansion between the case and the panel is reduced. Not only can relaxation be achieved in the same way as before, but also the curing time of the adhesive can be greatly reduced, improving production efficiency, and removing the display panel from the case at the time of repair etc. When the necessity arises, the effect that the removal can be easily performed is obtained.

According to the second aspect of the present invention, in addition to the first aspect of the present invention, since the lines connecting the ultraviolet curable adhesives scattered at three places are triangular (truss), the connection between the case and the panel is made. The effect that strength can be made higher can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view for explaining an example of an embodiment according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an explanatory perspective view showing a state where an ultraviolet curable adhesive is applied in a dotted manner on an inner peripheral portion of a plastic case.

FIG. 5 is an explanatory perspective view showing a state where a liquid crystal display panel is mounted on a plastic case.

FIG. 6 is an explanatory perspective view for explaining a method of curing an ultraviolet-curable adhesive.

FIG. 7 is a schematic plan perspective view of a TFT liquid crystal panel.

FIG. 8 is a sectional view taken along line HH of FIG. 7;

FIG. 9 is a flowchart for explaining a process of assembling the liquid crystal display panel.

FIG. 10 is an explanatory sectional view for explaining a casing mounting structure of a conventional liquid crystal display panel.

[Explanation of symbols]

 20: TFT array substrate (first substrate) 108: counter substrate (second substrate) 113: image display area (electro-optical display area) 120: TFT liquid crystal display panel (display panel) 200: plastic case 300 UV curable adhesive

Claims (2)

[Claims] 1. An electro-optical device comprising: a pair of panels each having an electro-optical material between substrates; and a case for accommodating the panel, wherein an outer peripheral portion of one surface of the panel and an inner peripheral portion of the case are provided. An electro-optical device, wherein the display panel and the case are in close contact with each other by dispersing an ultraviolet-curable adhesive in a circumferential direction between the display panel and the case. 2. The panel according to claim 1, wherein the panel has a rectangular shape, and the ultraviolet curable mold is provided at three locations: a substantially central portion of one side of each of the opposite sides of the panel and both corners of the other side. 2. The electro-optical device according to claim 1, wherein an adhesive is scattered.