JP5657906B2 - Liquid crystal display device, method for manufacturing the same, and electronic apparatus - Google Patents

Description

  The present invention relates to a method for manufacturing a liquid crystal display device in which a transparent substrate is attached to a display surface of a liquid crystal panel with an optical adhesive.

  2. Description of the Related Art In recent years, with the thinning of liquid crystal panels, liquid crystal display devices in which a transparent protective plate such as a cover glass that protects the display surface of the liquid crystal panel from scratches and impacts have been widely used. In addition, with the increasing functionality of electronic devices, liquid crystal display devices in which a touch panel is installed on the display surface of a liquid crystal panel are also widely used. In such a liquid crystal display device, when an air layer having a different refractive index is interposed between the liquid crystal panel and a transparent protective plate or touch panel (hereinafter referred to as a transparent body), the light is reflected by the air layer and the liquid crystal display device. Since the transmittance of the liquid crystal is reduced, a configuration in which an optical adhesive is filled between the liquid crystal panel and the transparent body is widely known. According to such a configuration, since the liquid crystal panel and the transparent body are integrated, there is an advantage that the impact resistance is improved.

  Moreover, in a liquid crystal display device, a backlight for illuminating the liquid crystal panel from the back side may be used. In such a case, a configuration is known in which a liquid crystal panel in which a transparent body that is slightly larger than the liquid crystal panel is bonded to the surface with an optical adhesive is incorporated into a backlight frame that is a frame together with the backlight. In addition, in such a liquid crystal display device, a configuration is proposed in which impact resistance is improved by integrally bonding a transparent body and a backlight frame with a room-temperature curable adhesive at the overlapping portion of the liquid crystal panel. (For example, refer to Patent Document 1 and Patent Document 2).

  6 (f) to 6 (j) are diagrams showing a manufacturing process of a conventional liquid crystal display device. First, as shown in FIG. 6 (f), a UV curable optical adhesive 2 is applied to the surface of the liquid crystal panel 3. Next, as shown in FIG. 6G, the transparent body 1 and the liquid crystal panel 3 are bonded together. 6 (h), a frame body 4 that accommodates the back light source 17 and the optical sheet 16 is prepared. As shown in FIG. 6 (i), the transparent body 1, the optical adhesive 2, and the liquid crystal panel 3 are attached to the frame body 4. Is integrated. Finally, in FIG. 6 (j), a room temperature curing type adhesive 5 is filled between the transparent body 1 and the frame body 4. At this time, since the gap between the transparent body 1 and the frame body 4 is about 0.6 mm, in order to uniformly provide the room temperature curing type adhesive 5, a dispenser device is used and a nozzle having a tip of 0.6 mm or less is used. Use. Further, an adhesive having a viscosity of about 20 Pa · s is used for the room temperature curable adhesive 5.

JP2009-163132A (FIG. 1) JP 2009-122655 A

  However, in the conventional liquid crystal display device, when the adhesive is provided by using a dispenser device, it is necessary to align the nozzle tip so as not to contact the transparent body 1 and the frame body 4. Specifically, the gap between the nozzle tip and the transparent body 1 and the frame body 4 is required to be about 0.05 mm, and it takes time to align the dispenser. Further, when the nozzle tip comes into contact with the inside of the frame or excessively enters the adhesive filling region, the room temperature curable adhesive 5 is immersed in the optical sheet 16 provided in the frame 4. There was a problem that a troublesome display failure occurred.

  Further, with the thinning of the liquid crystal panel, there is a problem that the gap between the liquid crystal panel and the frame is reduced and the dispenser nozzle is not required. For this reason, the impact resistance and display quality of the liquid crystal display device have been reduced.

  In the liquid crystal display device of the present invention, a liquid crystal panel in which a transparent body having a larger outer periphery than the liquid crystal panel is bonded to the display surface with an optical adhesive and a back light source are housed in a frame body, and the side wall of the frame body Is formed with a groove for applying an adhesive. Then, the frame and the transparent body are bonded by the adhesive applied to the groove, and the transparent body, the liquid crystal panel, the back light source, and the frame are integrated.

  In the electronic device of the present invention, the above-described liquid crystal display device is housed in an exterior case, and a cushioning material is provided between the frame and the exterior case. Further, the transparent body and the outer case are set so as not to contact each other.

In the method for producing a liquid crystal display device of the present invention, first, a transparent body is bonded to the surface of the liquid crystal panel with an optical adhesive. Then, the rear light source is housed in a frame having a groove formed on the side wall, and a room temperature curing adhesive is provided in the groove. Further, the liquid crystal panel is accommodated in a frame body, and the transparent body and the frame body are bonded to each other with a room temperature curable adhesive.
Furthermore, the room temperature curable adhesive has a viscosity of 70 Pa · s.

  The adhesive can be uniformly filled without inserting the nozzle of the dispenser device into the gap between the transparent body and the backlight frame, and the impact resistance of the liquid crystal display device can be improved. In addition, a groove is provided on the side wall of the backlight frame, and this groove is filled with a relatively high-viscosity adhesive, which prevents the adhesive from penetrating into the optical member of the backlight and improves the reliability of the liquid crystal display device. Can be improved.

It is sectional drawing which shows the structure which incorporated the liquid crystal display device of this invention in the housing | casing of the electronic device. It is a top view which shows the structure of the liquid crystal display device of this invention. It is sectional drawing which shows the structure of the liquid crystal panel used for the liquid crystal display device of this invention. It is a top view which shows the structure of the frame used for the liquid crystal display device of this invention. It is process drawing explaining the manufacturing method of the liquid crystal display device of this invention. It is process drawing explaining the manufacturing method of the conventional liquid crystal display device.

  In the liquid crystal display device of the present invention, a transparent body having a larger outer periphery than the liquid crystal panel is bonded to the display surface of the liquid crystal panel with an optical adhesive. This liquid crystal panel is housed in a frame together with a rear light source, and a groove for applying an adhesive is formed on the side wall of the frame. The frame and the transparent body are bonded by the adhesive applied to the groove, and the transparent body, the liquid crystal panel, the back light source, and the frame are integrated. The transparent body may be a transparent protective plate or a touch panel that protects the liquid crystal panel.

The side walls of the frame are formed on three sides excluding the sides corresponding to the terminal portions of the liquid crystal panel.
The adhesive applied to the grooves may be a room temperature curable adhesive having a relatively high viscosity.
An optical sheet may be provided between the back light source and the liquid crystal panel.
In the electronic device of the present invention, the above-described liquid crystal display device is housed in an exterior case, and a cushioning material is provided between the frame and the exterior case. Further, the transparent body and the outer case are configured not to contact each other.

Moreover, the manufacturing method of the liquid crystal display device of this invention adhere | attaches a transparent body on the surface of a liquid crystal panel with an optical adhesive. Then, an adhesive is provided on the frame body that houses the back light source to bond the transparent body and the frame body, and the liquid crystal panel is housed in the frame body. A groove for applying an adhesive is formed on the side wall of the frame. Further, the adhesive is provided to a position higher than the upper surface of the side wall. Therefore, an adhesive having a relatively high viscosity is used, and specifically, a room temperature curing adhesive having a viscosity of about 70 Pa · s is desirable. In the method for manufacturing a liquid crystal display device of the present invention, an adhesive is applied to the groove formed in the frame, and then the liquid crystal panel is incorporated into the frame.
Examples of the present invention will be described below.

  The configuration of the liquid crystal display device of this embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing the configuration of the liquid crystal display device of this embodiment. A transparent body 1 such as a cover glass or a touch panel is adhered to the entire surface of the liquid crystal panel 3 with an optical adhesive 2. The transparent body 1 may be a protective cover glass such as glass, acrylic, or PMMA, or may be a capacitive touch panel. The transparent body 1 has a size larger than the outer periphery of the liquid crystal panel 3. Further, the liquid crystal panel 3 is disposed on the optical sheet 16 provided on the back light source 17 and is housed in the frame body 4. A groove 6 is formed on the side wall of the frame body 4, and the adhesive 5 is filled in the groove 6. FIG. 2 is a top view of the liquid crystal display device of this embodiment. As shown in the figure, the adhesive 5 is provided in a U shape in the 6 o'clock direction of the liquid crystal panel 3, that is, on the three sides excluding the terminal portion side on which the driver IC and the circuit board 9 are mounted. With this adhesive 5, the frame 4 and the transparent body 1 are bonded together, and the transparent body 1, the liquid crystal panel 3, the rear light source 17 and the frame 4 that houses the optical sheet 16 are integrated as shown in FIG. 1. .

  Here, the configuration of the liquid crystal panel 3 will be described in detail. FIG. 3 is a cross-sectional view of the liquid crystal panel 3 used in this embodiment. As shown in FIG. 3, in the liquid crystal panel 3, liquid crystal (not shown) is sandwiched between the substrate 12 and the counter substrate 11. An upper polarizing plate 10 is provided on the surface of the counter substrate 11, and a lower polarizing plate 13 is provided on the back surface of the substrate 12. A driver IC 8 for driving and a circuit board 9 are mounted on the terminal portion of the surface of the substrate 12.

  The liquid crystal panel 3 is housed in the frame 4. Therefore, the outer periphery of the frame 4 is set larger than the transparent body 1.

  FIG. 4 is a top view of the frame 4 used in this embodiment. As shown in FIG. 4, side walls are formed on the frame body 4 on three sides excluding the side corresponding to the terminal portion of the liquid crystal panel (side in the 6 o'clock direction). A groove is provided for filling. In this embodiment, the depth of the groove is about 0.2 mm, and the width of the groove is about 0.6 mm. The adhesive 5 is a room temperature curable adhesive.

  In the concave portion 7 of the frame body 4, the rear light source 17 shown in FIG. 1 and the optical sheet 16 are provided on the upper surface, and the liquid crystal panel 3 is disposed on the optical sheet 16. The back light source 17 includes a side light type backlight that guides light from an LED light source provided on the side surface with a light guide plate and illuminates the liquid crystal panel from the back surface, a cold cathode fluorescent tube, an EL backlight, and the like. The lighting device may be used. The optical sheet 17 may be a lens sheet or a diffusion sheet. Further, the optical sheet 17 may not be provided.

  As shown in FIG. 1, the liquid crystal panel 16 is accommodated in the recess of the frame body 4 and the transparent body 1 is bonded to the frame body 4 by the adhesive 5 provided in the groove 6 of the frame body 4. As a result, the liquid crystal display device according to the present embodiment has a configuration in which the frame body 4 in which the back light source 17 is housed, the liquid crystal panel 3 and the transparent body 1 are integrated.

  Thus, by forming the groove 6 for providing the adhesive on the side wall of the frame 4, the adhesive 5 is prevented from entering the back light source 17 side and the reliability is improved. Can improve the impact resistance.

  Next, the configuration of an electronic apparatus incorporating the liquid crystal display device of this embodiment will be described. As shown in FIG. 1, the electronic apparatus of this embodiment has a configuration in which the above-described liquid crystal display device is housed in a housing cover 14 of the electronic apparatus. Here, a buffer material 15 is installed at a location where the frame 4 and the housing cover 14 come into contact. On the other hand, the transparent body 1 and the housing cover 14 are arranged so as not to contact each other. With such a configuration, when an external impact is applied to the housing cover 14, the impact can be absorbed by the adhesive 5 and damage to the liquid crystal panel or the transparent body can be reduced.

  Next, a method for manufacturing the liquid crystal display device of this embodiment will be described. FIGS. 5A to 5E are diagrams showing the steps of the method for manufacturing the liquid crystal display device of this embodiment. In addition, since the liquid crystal display device of a present Example is the same structure as Example 1, description is abbreviate | omitted suitably about the structural member of a liquid crystal display device.

  First, as shown in FIG. 5A, the optical adhesive 2 is applied to the surface of the liquid crystal panel 3 facing the transparent body 1 such as a cover glass or a touch panel. Then, as shown in FIG. 5B, the transparent body 1 and the liquid crystal panel 3 are bonded together. Next, as shown in FIG.5 (c), the frame 4 is prepared. A rear light source 17 and an optical sheet 16 are disposed on the frame 4. As described above, the frame 4 is provided with a recess at the center, and the liquid crystal panel is accommodated in the recess. FIG. 5D shows a step of filling the adhesive 5 in the groove formed on the side wall of the frame body 4. The adhesive 5 is desirably provided so as to be higher than the height of the groove and not to flow out of the groove. Therefore, the adhesive 5 has a higher viscosity than the conventional one. Specifically, a room temperature curing adhesive having a viscosity of about 70 Pa · s may be used. In this embodiment, a groove having a width of about 0.6 mm and a height of about 0.2 mm is formed on the side wall of the frame body 4, and the adhesive is filled at a height of about 0.4 mm. In this embodiment, a normal temperature curable adhesive having a viscosity of 70 Pa · s is used for the adhesive 5.

  After the adhesive 5 is applied to the groove, the liquid crystal panel 3 is housed in the recess of the frame body 4 and the transparent body 1 and the frame body 4 are bonded together with the adhesive 5 as shown in FIG.

  As described above, in this embodiment, unlike the conventional case, the room temperature curing type adhesive is applied to the groove on the side wall formed in the backlight frame before the liquid crystal panel provided with the transparent body in the backlight frame is incorporated. . According to such a method, since the adhesive only has to be applied along the groove, the dispenser can be adjusted more easily than before. That is, the adhesive can be provided uniformly without being affected by the size of the gap between the backlight frame, the liquid crystal panel, and the transparent body. Moreover, since the high-viscosity adhesive is provided in the groove, the adhesive can be prevented from entering the optical sheet and the back light source.

DESCRIPTION OF SYMBOLS 1 Transparent body 2 Optical adhesive 3 Liquid crystal panel 4 Frame 5 Adhesive 6 Groove 7 Recess 8 Driver IC
DESCRIPTION OF SYMBOLS 9 Circuit board 10 Upper polarizing plate 11 Counter substrate 12 Substrate 13 Lower polarizing plate 14 Case cover 15 Buffer material 16 Optical sheet 17 Back light source

Claims (5)

LCD panel,
Adhered to the surface of the liquid crystal panel with an optical adhesive, a transparent body whose outer periphery is larger than the liquid crystal panel,
A back light source provided on the back of the liquid crystal panel;
The liquid crystal panel and the back light source are housed, and a frame body having a groove formed on a side wall,
The groove is formed higher than the other part of the side wall and lower than the surface of the liquid crystal panel,
The liquid crystal display device, wherein the transparent body and the frame body are bonded by an adhesive filled in the groove. LCD panel,
Adhered to the surface of the liquid crystal panel with an optical adhesive, a transparent body whose outer periphery is larger than the liquid crystal panel,
A back light source provided on the back of the liquid crystal panel;
A frame body that houses the liquid crystal panel and the rear light source, and a groove is formed on a side wall;
An outer case provided on the outer periphery of the frame and the transparent body,
The groove is formed higher than the other part of the side wall and lower than the surface of the liquid crystal panel,
The electronic device, wherein the transparent body and the frame body are bonded by an adhesive filled in the groove. A cushioning material is provided between the frame and the outer case,
The electronic device according to claim 2, wherein the transparent body and the outer case are not in contact with each other. A first step of adhering a transparent body to the surface of the liquid crystal panel with an optical adhesive;
A second step of housing a back light source in a frame having grooves formed on the side walls higher than other portions of the side walls and lower than the surface of the liquid crystal panel, and providing a room temperature curable adhesive in the grooves When,
And a third step of housing the liquid crystal panel in the frame and bonding the transparent body and the frame with the room temperature curing adhesive.   The method of manufacturing a liquid crystal display device according to claim 4, wherein the room temperature curable adhesive has a viscosity of 70 Pa · s.

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