JPH10153786A - Double-seal structure liquid crystal display panel, and liquid crystal display device with input touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display panel, which is prevented from having air bubbles when a transparent input touch panel is stuck onto a liquid crystal display panel using a polymer film as at least one substrate by using a transparent adhesive tape, and to provide a sticking structure for the liquid crystal display panel and transparent input touch panel, which uses this display panel. SOLUTION: The liquid crystal display panel has a liquid crystal layer sandwiched between a couple of substrates 7 and 9, one of which is a polymer film substrate, and a double-seal structure consisting of an inside seal 81 and an outside seal 82 having a gap formed between them is adopted as the seal structure of the upper substrate 7 and lower substrate 9 of the liquid crystal display panel. On this liquid crystal display device has the transparent input touch panel 1 stuck on the liquid crystal display panel by using the transparent adhesive sheet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, particularly a liquid crystal display panel device suitable for combination with a transparent input touch panel, and a liquid crystal display device combining the liquid crystal display panel with a transparent input touch panel.

[0002]

2. Description of the Related Art When a liquid crystal display device is mounted on a portable communication device or the like, a transparent input touch panel is often mounted on a display surface of the liquid crystal display device so as to enable handwriting input. The conventional structure is such that a double-sided tape 12 or the like is provided on a peripheral frame of a metal bezel 13 storing a liquid crystal display panel constituted by sandwiching a liquid crystal layer between a pair of substrates 7 and 9 as shown in FIG. There is one with a transparent input touch panel attached. In this case, an air layer of about 1 to 2 mm is formed between the transparent input touch panel 11 and the liquid crystal display panel because the bezel 13 has a thickness. This air layer reflects light, and the contrast of the liquid crystal display decreases.

For this reason, as shown in FIG. 5, the transparent input touch panel 14 and the liquid crystal display panel 16 are adhered to the entire surface with a transparent adhesive tape 15 having no base material, so that the distance between the transparent input touch panel 14 and the liquid crystal display panel 16 is reduced. In addition, it has been confirmed that the contrast is improved because the air layer disappears (Japanese Patent Laid-Open No. 7-10578).
1).

Here, when a transparent input touch panel is adhered to a liquid crystal display panel using a polymer film as a substrate by using a transparent adhesive tape, the liquid crystal display touching the end face of the transparent adhesive tape due to an influence of a drop, an impact or the like. It was found that bubbles were generated in the panel. This is the moment when the shock is applied, the transparent adhesive tape moves the substrate of the liquid crystal display panel,
At that time, it is considered that a large differential pressure is instantaneously generated in the liquid crystal display panel around the end point portion of the transparent adhesive tape because the end surface portion becomes the boundary of the change point. The generated bubbles are
Depending on the ITO pattern of the liquid crystal display panel, the liquid crystal display panel may move to a place with a large gap, and in the worst case, may enter the display area and give a fatal defect to the display.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to prevent the generation of air bubbles when a transparent input touch panel is adhered to a liquid crystal display panel using a polymer film as at least one substrate by using a transparent adhesive tape. And a liquid crystal display panel using the display panel and a structure for attaching a liquid crystal display panel and a transparent input touch panel.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a liquid crystal display panel having a liquid crystal layer sandwiched between a pair of substrates, at least one of which is a polymer film substrate. The liquid crystal display device with a transparent input touch panel, characterized in that the seal structure of (1) is a double seal structure composed of an internal seal and an external seal with a gap formed in the middle, and a transparent adhesive sheet on the liquid crystal display panel The above problem was solved by providing a liquid crystal display device with a transparent input touch panel, wherein the input touch panel was attached.

As the polymer film substrate of the liquid crystal display panel, for example, polyester, polycarbonate,
Transparent polymer films such as polyethersulfone are exemplified. However, when the polymer film substrate is a lower substrate, it is not always necessary to be a transparent substrate. Further, an electrode, an alignment film and the like are usually arranged on the inner surface of the substrate, and a polarizing plate and the like may be arranged on the outer surface as needed.

Examples of the substrate of the transparent input touch panel include transparent polymer films such as polyester and polycarbonate. Both the upper and lower substrates of the transparent input touch panel may be the transparent polymer films, but the lower substrate may be a glass substrate. Can be used.

As the transparent adhesive sheet, cellophane,
Polyester, a tape-like base material such as rayon and the like coated with an adhesive on both surfaces can also be used, but from the viewpoint of transparency and elasticity, for example, a polyacrylic ester is used as a main component and the base material is used. A transparent acrylic pressure-sensitive adhesive formed in the shape of a sheet without the use of the same. Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

1. FIG. 1 shows an example of the liquid crystal display panel of the present invention. The liquid crystal display panel 3 includes a polarizing plate 6 on the outer surface, an upper substrate 7 having an electrode and an alignment film (not shown) on the inner surface, a polarizing plate 10 on the outer surface, and an electrode and an alignment film (not shown) on the inner surface. And a lower substrate 9 having an inner seal 81 and an outer seal 82 having a gap therebetween. The double seal structure was formed by a screen printing method. The distance between the inner seal 81 and the outer seal was about 1 to 2 mm. Further, it is preferable that the inner seal 81 having the double seal structure is divided into several parts so as to easily fill the liquid crystal as shown in FIG. As the sealing agent, a thermosetting epoxy adhesive was used.

The touch panel 1 is of a resistive type, and the upper substrate 4 of the touch panel is a polyester sheet (4 m thick).
m), the lower substrate 5 was made of glass (thickness: 1.1 mm).

The touch panel 1 and the liquid crystal display panel 3 are adhered using an acrylic transparent adhesive tape 2 having no base material. This attachment is performed by first attaching the acrylic transparent adhesive tape 2 to the outer surface of the polarizing plate 6 of the liquid crystal display panel 3 or first attaching it to the lower substrate 5 of the transparent input touch panel 1.

After attaching the touch panel 1 and the liquid crystal display panel 3 using an acrylic transparent adhesive tape 2,
The end surface of the acrylic transparent adhesive tape 2 was disposed to extend between the inner seal 81 and the outer seal of the liquid crystal display panel 3. For this reason, the upper substrate 7 of the liquid crystal display panel is instantaneously moved to the acrylic transparent adhesive tape 2 by an impact or the like.
, Since the seals 81 and 82 are provided on both sides of the end surface of the adhesive tape 2, the seals 81 and 82
Accordingly, the movement of the substrate 7 is suppressed as much as possible, and the generation of bubbles is prevented. Even if bubbles are generated due to the movement of the tape 2, the substrate interval between the upper substrate 7 and the lower substrate 9 between the internal seal 81 and the external seal 82 is thicker than the substrate interval of the display unit. Therefore, the movement of the generated bubble into the display area is suppressed, and does not move into the display area.

2. FIG. 3 also shows FIGS.
The touch panel 1 and the liquid crystal display panel 3 are attached using an acrylic transparent adhesive tape 2 in the same manner as in the above, except that the acrylic transparent adhesive tape 2 is different from those shown in FIGS. The end face is arranged so as to extend outside the outer seal of the double seal structure of the liquid crystal display panel. Therefore, even if the upper substrate 7 of the liquid crystal display panel is instantaneously moved by the acrylic transparent adhesive tape 2 due to an impact or the like, the movement of the generated bubbles is suppressed,
It does not move into the display area.

The liquid crystal display panel of the present invention is not limited to a touch panel, but is also effective when another member is attached to the liquid crystal display panel with an adhesive tape.

[0016]

【effect】

1. A liquid crystal display panel in which bubbles are prevented from being generated when a transparent input touch panel is attached using a transparent adhesive tape is provided. 2. Claims 2 and 3 The generation of air bubbles is prevented, and even if air bubbles are generated, the movement of the air bubbles is suppressed, and the air bubbles do not move into the display area. 3. Claim 4 The movement of the bubble is suppressed and does not move into the display area.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment in which a touch panel 1 is attached to a liquid crystal display panel 3 of the present invention using an acrylic transparent adhesive tape 2;

FIG. 2 is a plan view of a cross section taken along line AB in FIG.

FIG. 3 is a cross-sectional view of another embodiment in which a touch panel 1 is attached to a liquid crystal display panel 3 of the present invention using an acrylic transparent adhesive tape 2;

FIG. 4 is a cross-sectional view of a conventional structure in which a touch panel is provided on a metal bezel of a liquid crystal display panel.

FIG. 5 is a cross-sectional view of a conventional structure in which a touch panel is provided on a liquid crystal display panel having a normal seal structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Touch panel 2 Transparent adhesive tape 3 Liquid crystal display panel 4 Touch panel upper substrate 5 Touch panel lower substrate 6 LCD upper polarizing plate 7 LCD upper substrate 81 Inner seal 82 Outer seal 9 LCD lower substrate 10 LCD lower polarizer 11 Touch panel 12 Double-sided tape 13 Metal bezel 14 touch panel 15 transparent adhesive tape 16 liquid crystal display panel 17 liquid crystal display panel seal

Claims (4)

[Claims] 1. A liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of substrates, at least one of which is a polymer film substrate, wherein a seal structure between an upper substrate and a lower substrate of the liquid crystal display panel is provided with a gap therebetween. A liquid crystal display panel having a double seal structure composed of an inner seal and an outer seal formed with. 2. A liquid crystal display device with a transparent input touch panel, wherein a transparent input touch panel is attached to the liquid crystal display panel according to claim 1 with a transparent adhesive sheet. 3. The liquid crystal with a transparent input touch panel according to claim 2, wherein an end face of the transparent pressure-sensitive adhesive sheet extends to a position between an inner seal and an outer seal of the double seal structure of the liquid crystal display panel. Display device. 4. The liquid crystal display device with a transparent input touch panel according to claim 2, wherein an end face of the transparent pressure-sensitive adhesive sheet is arranged so as to extend outside an outer seal of a double seal structure of the liquid crystal display panel.