JP2013142812A - Liquid crystal display device and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a transparent substrate from being damaged in a corner of a terminal part when external force is applied to an LCD.SOLUTION: A liquid crystal display device has a configuration in which a transparent body is connected to the counter substrate side of an LCD. A film and resin are laminated so as to fill a gap between a terminal part of the LCD and the transparent body. A laminate of the resin and the film becomes a pillar to support the terminal part and the transparent body. As a result, rigidity of the terminal part can be improved.

Description

  The present invention relates to a liquid crystal display device having a configuration in which a liquid crystal display panel is attached to a transparent body.

  In recent years, a configuration in which a glass body such as a windshield, a touch panel, a 3D barrier glass or the like (hereinafter collectively referred to as a transparent body) is bonded to a liquid crystal display panel (hereinafter referred to as an LCD) is increasing. Along with this, thinning of the LCD has been desired, and the necessity of thinning the glass substrate constituting the LCD is increasing. However, when the glass substrate is thinned, the strength against external force is weakened, and breakage such as cracks and cracks is likely to occur. In particular, since the terminal portion of the LCD is composed of a single glass substrate, it is vulnerable to impacts when dropped or deformation due to external force. Therefore, a device for strengthening the terminal portion has been proposed.

  FIG. 3 is a cross-sectional view schematically showing a liquid crystal display device having a structure in which a gap between the terminal portion and the glass body is filled with a film. The LCD 11 has a configuration in which a liquid crystal layer 6 is provided between a glass substrate 7 and a counter substrate 4. A frame-shaped sealing material 5 is provided on the outer peripheral portion of the counter substrate 4, and the glass substrate 7 and the counter substrate 4 are bonded to each other with a predetermined gap. A liquid crystal layer 6 is sealed in the gap. A pair of polarizing plates is disposed outside the glass substrate 7 and the counter substrate 4. Further, the glass substrate 7 has a region that does not face the counter substrate 4, and this region becomes the terminal portion 8. The terminal unit 8 is mounted with a driver IC or FPC for driving an LCD (not shown). The glass body 1 and the LCD 11 are bonded together with an adhesive layer 2. That is, the polarizing plate 3 and the glass body 1 on the counter substrate 4 side are bonded by the adhesive layer 2. At this time, the structure which fills the clearance gap G between the back surface of the glass body 1 and the surface of the glass substrate 7 with the film 12 is known (for example, refer patent document 1).

  Moreover, the structure using resin instead of a film is known (for example, refer patent document 2). A liquid crystal display device having this configuration is schematically shown in FIG. Here, the configuration of the LCD 11 is the same as that of FIG. FIG. 4A is a top view of the liquid crystal display device, showing the application position of the resin 13. Therefore, the state seen through from the glass body 1 side is typically shown. Further, the adhesive layer 2 and the polarizing plate 3 are omitted. As shown in the figure, the glass substrate 7 of the LCD 11 includes a terminal portion 8. A driver IC 9 and an FPC 10 are mounted on the terminal portion 8. The resin 13 is applied to both ends of the terminal portion 8. According to Patent Document 2, since there is a stress concentration point at the corner of the terminal portion 8, the stress concentration is alleviated by applying the resin 13 at this position. FIG. 4B shows a cross-sectional shape taken along line AA in FIG. As illustrated, a resin 13 is provided between the back surface of the glass body 1 and the surface of the glass substrate 7.

JP 2009-198850 A JP 2006-227417 A

  In the configuration described in Patent Literature 1, the following problems occur when the thickness of the film 12 is different from the gap G between the glass body 1 and the terminal portion 8. FIG. 5A schematically shows a case where the film 12 is thicker than the gap G, and FIG. 5B schematically shows a case where the film 12 is thinner than the gap G.

  As shown in FIG. 5A, when the film 12 is thicker than the gap G, it is difficult to horizontally bond the glass body 1 to the LCD 11. Therefore, there is a possibility that bubbles are mixed in the adhesive layer 2 near the terminal portion side or sufficient filling cannot be performed. Similar problems occur even when a double-sided tape or OCA (Optical-Clear-Adhesive) is used as the adhesive layer 2 instead of the adhesive 2.

  As shown in FIG. 5B, when the film 12 is thinner than the gap G, when an external force is applied to the terminal portion 8, the terminal portion 8 is bent and cracks are easily generated. This is because a gap exists between the glass body 1 and the film 12. Thus, when the film 12 is thin, a terminal part cannot fully be strengthened.

  Usually, the thickness of the film 12 is determined by the total thickness of the counter substrate 4, the polarizing plate 3 on the counter substrate side, and the adhesive layer 2. At this time, the liquid crystal layer 6 is negligible because it is much thinner than these thicknesses. On the other hand, the thickness of the counter substrate 4 and the polarizing plate 3 is about ± 5 to 10%, and the thickness of the adhesive layer 2 is also about 10%, resulting in manufacturing variations. Therefore, even a film having the same thickness may be too thick or too thin depending on the LCD. Therefore, in the configuration in which the gap G between the glass body 1 and the terminal portion 8 is filled with the film 12, the terminal portion is not stably strengthened.

  The configuration described in Patent Document 2 has the following problems. As shown in FIG. 4B, the resin 13 is filled in the gap G regardless of the gap G variation. Therefore, the problem as in Patent Document 1 does not occur. However, the resin has a characteristic of shrinking when cured (hereinafter referred to as curing shrinkage). FIG. 6 schematically shows a cross-sectional state after the resin is cured. As shown in the drawing, the glass body 1 and the terminal portion 8 are pulled by the curing shrinkage of the resin 13. Therefore, the thickness of the liquid crystal layer 6 near the terminal portion 8 changes. When the thickness of the liquid crystal layer 6 changes, the color changes, so that partial unevenness is visually recognized in the vicinity of the terminal portion 8.

  Further, if the amount of the resin applied is large, the resin 13 flows out to the outside of the glass substrate 7, and the back side polarizing plate and the backlight are soiled. When displayed in this state, it is visually recognized as spots or unevenness. Further, when the resin 13 flows out to the driver IC 9 side, there is a possibility that the influence of curing shrinkage may reach not only the corner of the terminal portion 8 but also the center portion. As described above, when the gap G is filled with the resin 13, there is a possibility that the display quality is deteriorated due to resin leakage or outflow.

  Accordingly, the present invention provides a liquid crystal display device in which a transparent body is bonded to the opposite substrate side of the LCD by an adhesive layer, and a film and a resin are laminated so as to fill a gap between the transparent body and the terminal portion of the LCD. did. The LCD has a configuration in which a liquid crystal layer is sandwiched between a transparent substrate and a counter substrate smaller than the transparent substrate. Further, the transparent substrate and the counter substrate are bonded together with a sealing material so that the terminal portion is formed on the transparent substrate.

  As described above, since the film and the resin are laminated to fill the space between the transparent body and the terminal portion, the problem caused by the thick film as in Patent Document 1 and the problem caused by the thin film are simultaneously solved. . Furthermore, the problem due to curing shrinkage as in Patent Document 2 is solved by reducing the amount of curing shrinkage of the resin.

  In addition, a laminate of a film and a resin is provided at both ends of the terminal portion. The shape of the film is preferably a polygon such as a quadrangle. Moreover, the film was joined to the terminal part, and resin was filled between the film and the transparent body. Furthermore, the thickness of the film is preferably about 80% of the gap between the transparent body and the terminal portion.

  In addition, the method of manufacturing the liquid crystal display device of the present invention includes a step of manufacturing an LCD by bonding a counter substrate to a transparent substrate so that the terminal portion is formed on the transparent substrate, and a step of attaching a film material to the terminal portion. And a step of adhering the transparent body to the LCD from the counter substrate side and a step of filling the gap between the film material and the transparent body with a resin. Alternatively, an LCD is manufactured by attaching a counter substrate to a transparent substrate so that a terminal portion is formed on the transparent substrate, a step of attaching a film material to the transparent body, and the film material faces the terminal portion. Thus, the process of adhering the transparent body to the LCD from the counter substrate side and the process of filling the gap between the film material and the terminal part with resin are included. The viscosity of the resin is preferably in the range of 800 to 6000 mPa · s.

  According to the liquid crystal display device of the present invention, the strength can be maintained even if the LCD is thinned.

1 is a schematic diagram illustrating a configuration of a liquid crystal display device of Example 1. FIG. 6 is a schematic diagram illustrating a liquid crystal display device of Example 2. FIG. It is sectional drawing which shows the structure of the conventional liquid crystal display device. It is a schematic diagram which shows the structure of the conventional liquid crystal display device. It is a schematic diagram explaining the subject resulting from the structure of the conventional liquid crystal display device. It is a schematic diagram explaining the subject resulting from the structure of the conventional liquid crystal display device.

  The liquid crystal display device of the present invention has a configuration in which a transparent body is bonded to the opposite substrate side of the LCD, and a film and a resin are laminated so as to fill a gap between the transparent substrate of the LCD and the transparent body. . This solves the lack of strength associated with the thinning of the liquid crystal display device. The LCD has a configuration in which a transparent substrate and a counter substrate smaller than the transparent substrate are bonded together with a sealing material. A terminal portion is formed on the transparent substrate of the LCD. Since the terminal portion is composed of a single substrate, cracks and cracks are likely to occur. In particular, the corners of the terminal are most affected by external forces and impacts. In the present invention, the lack of strength is solved by laminating a film and a resin in the gap between the transparent body and the terminal portion of the LCD. Here, a film thinner than the gap is used, and a resin is provided on the film. This laminate of film and resin serves as a pillar that supports the terminal portions of the transparent body and the LCD. Since the resin is provided on the film, the gap between the film and the transparent body is reduced. Inevitably, the resin will be thinner and less supply. Since the resin has a characteristic that the amount of cure shrinkage per unit volume is constant, the amount of cure shrinkage decreases as the resin becomes thinner. Accordingly, the influence of curing shrinkage is reduced. In addition, when the amount of resin is small, the pressure (momentum) when spreading wet is reduced. That is, when the amount of resin is small, the force to suppress the momentum by the surface tension becomes larger than the momentum spreading on the film. Thereby, leakage of resin is suppressed.

The laminate of film and resin may be provided on the entire terminal portion of the LCD or may be provided separately at a plurality of locations. Moreover, you may provide only in the corner of a terminal part. At this time, the shape of the film is not limited as long as it can cover the corner of the LCD. When the thickness of the film is about 80% of the gap between the transparent body and the terminal portion, the resin leakage resistance and impact resistance are improved.
Hereinafter, an embodiment in which a glass body is used as a transparent body bonded to an LCD will be described with reference to the drawings.

Example 1
FIG. 1 schematically shows a liquid crystal display device according to this example. FIG. 1A is a top view of the liquid crystal display device, and shows an arrangement site of the film 12 and the resin 13. Therefore, the state seen through from the glass body 1 side is typically shown. Here, the adhesive layer 2 and the polarizing plate 3 are omitted. FIG. 1B shows a cross-sectional shape taken along line AA in FIG. In this embodiment, the glass body 1 is larger than the LCD 11.

  The LCD 11 has a configuration in which a liquid crystal layer 6 is provided between a glass substrate 7 and a counter substrate 4. A frame-shaped sealing material 5 is provided on the outer peripheral portion of the counter substrate 4, and the glass substrate 7 and the counter substrate 4 are bonded to each other at a predetermined interval. The liquid crystal layer 6 is sealed in this gap. A pair of polarizing plates is disposed outside the glass substrate 7 and the counter substrate 4. Further, the glass substrate 7 has a region that does not face the counter substrate 4, and this region becomes the terminal portion 8. A driver IC 9 and an FPC 10 for driving the LCD are mounted on the terminal portion 8 on the extension of the glass substrate 7. The glass body 1 and the LCD 11 are bonded together with an adhesive layer 2. That is, the polarizing plate 3 and the glass body 1 on the counter substrate 4 side are bonded by the adhesive layer 2. At this time, a gap G is generated from the back surface of the glass body 1 to the surface of the glass substrate 7. A film 12 and a resin 13 are laminated on the corner of the terminal portion 8 so as to fill the gap G. The shape of the film 12 is preferably a polygon such as a triangle or a quadrangle. At this time, the thickness of the film 12 is desirably about 80% of the gap G. This is to prevent the film 12 from being thicker than the gap G even if the gap G varies. If it is about 80%, there is no possibility that the film 12 becomes thicker than the gap G even if the film thickness and the gap G vary.

  Next, a method for manufacturing a liquid crystal display device will be briefly described. First, the LCD 11 described above is manufactured by a general method. Next, the film 12 is disposed on the terminal portion 8 of the glass substrate 7 constituting the LCD 11. The film 12 is attached to both ends of the terminal portion 8. Next, the LCD 11 and the glass body 1 are bonded with an adhesive layer. This creates a gap between the glass body 1 and the film 12. Next, the resin 13 is supplied from above the film 12 to fill this gap. The amount of resin supplied is the same volume as the gap between the film and the transparent body. The viscosity of the resin is desirably in the range of 800 to 6000 mPa · s in consideration of leakage before curing.

  When an ultraviolet curable resin is used, the resin 13 is then cured by irradiating UV from the glass body 1 side. At this time, UV may be irradiated in parallel with the counter substrate 4 from the FPC 10 side. The resin 13 thus cured functions as a column that supports the glass body 1 and the terminal portion 8. Moreover, the shape of the film 12 may be a simple square, the film processing is easy, and the workability at the time of application is also good.

(Example 2)
FIG. 2 is a schematic view showing the liquid crystal display device of this embodiment. The area where the film 12 and the resin 13 are provided is different from that of the first embodiment. In Example 1, a film was pasted to the terminal portion corner to provide resin. However, in Example 2, the film is attached to the terminal portion 8 excluding the driver IC, and the resin is applied to the entire surface of the terminal portion. Since other configurations are the same as those of the first embodiment, the duplicate description is omitted.

  Hereinafter, the shape of the film 12, a bonding position, and the application position of the resin 13 will be described with reference to FIG. The film 12 is attached so as to cover the entire surface of the terminal portion 8 excluding the driver IC. At this time, the film thickness is desirably about 80% of the gap G as in the first embodiment. The resin 13 is applied so as to cover the entire surface of the terminal portion 8. Since the resin 13 is provided on the entire surface of the terminal portion, it is considered that the influence of curing shrinkage reaches the liquid crystal layer 6. However, the gap is reduced to about 20% of the gap G by the film 12. Accordingly, the curing shrinkage in the thickness direction itself does not increase so much, and the liquid crystal layer 6 is not affected. Thus, according to the present embodiment, the entire terminal portion is strengthened.

DESCRIPTION OF SYMBOLS 1 Glass body 2 Adhesion layer 3 Polarizing plate 4 Opposite substrate 5 Sealing material 6 Liquid crystal layer 7 Glass substrate 8 Terminal part 9 Driver IC
10 FPC
11 LCD
12 Film 13 Resin

Claims (9)

A transparent substrate, a counter substrate smaller than the transparent substrate, a sealing material for bonding the transparent substrate and the counter substrate so that a terminal portion is formed on the transparent substrate, and between the transparent substrate and the counter substrate An LCD having a sandwiched liquid crystal layer;
A transparent body bonded to the opposite substrate side of the LCD by an adhesive layer,
A liquid crystal display device, wherein a film and a resin are laminated so as to fill a gap between the transparent body and the terminal portion.   The liquid crystal display device according to claim 1, wherein the film and the resin are provided at both ends of the terminal portion.   The liquid crystal display device according to claim 2, wherein the film has a polygonal shape.   The liquid crystal display device according to claim 2, wherein the film is bonded to the terminal portion, and the resin is filled between the film and the transparent body.   An electronic component is mounted on the terminal portion, the film has an opening at a position corresponding to the electronic component, the film is provided on the entire surface of the terminal portion, and the resin covers the electronic component. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided between the film and the transparent body.   The liquid crystal display device according to claim 1, wherein a thickness of the film is approximately 80% of the gap. A process of manufacturing an LCD by bonding a counter substrate to the transparent substrate so that a terminal portion is formed on the transparent substrate;
A step of attaching a film to the terminal portion;
Adhering a transparent body to the LCD from the counter substrate side;
And filling the gap between the film and the transparent body with a resin. A process of manufacturing an LCD by bonding a counter substrate to the transparent substrate so that a terminal portion is formed on the transparent substrate;
A process of attaching a film to a transparent body;
Bonding the transparent body from the counter substrate side to the LCD such that the film faces the terminal portion;
Filling the gap between the film and the terminal portion with a resin, and a method for manufacturing a liquid crystal display device.   The method for producing a liquid crystal display device according to claim 7 or 8, wherein the viscosity of the resin is in a range of 800 to 6000 mPa / s.

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