JP2012003177A - Protection plate integrated liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protection plate integrated liquid crystal display panel capable of preventing the generation of defects in an optical sheet even when time elapses after the manufacture.SOLUTION: A protection plate integrated liquid crystal display panel 1 includes a liquid crystal display panel 2 having liquid crystal sandwiched between a pair of transparent substrates 6, 7 and a first optical sheet 8 attached to a front surface of the first transparent substrate 6 which is arranged on the front side in the pair of the transparent substrates 6, 7, a protection plate 5 arranged to be opposed to the front side of the liquid crystal display panel 2, and a resin layer 4 which bonds the liquid crystal display panel 2 and the protection plate 5. The protection plate integrated liquid crystal display panel 1 further includes a transparent sheet 3 which is provided between the liquid crystal display panel 2 and the resin layer 4 and is attached to the liquid crystal display panel 2 so as to cover a predetermined region of a front surface 81 and a predetermined region of an edge surface 82 of the first optical sheet 8.

Description

  The present invention relates to a protective plate integrated liquid crystal display panel.

  In a conventional protective plate integrated liquid crystal display panel, a protective plate is disposed on the front side of the liquid crystal display panel with a gap between the protective plate and the liquid crystal display panel. A protective plate is attached to the liquid crystal display panel by filling the gap with an unpolymerized resin and polymerizing it (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-174417

  However, in the conventional protection plate integrated liquid crystal display panel, the unpolymerized resin is provided in direct contact with the liquid crystal display panel and the protection plate, respectively. That is, the unpolymerized resin and its solvent come into contact with the optical sheet provided on the front surface of the liquid crystal display panel. Therefore, there is a risk that defects such as cracks may occur in the optical sheet with the passage of time after the protective plate is attached.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a protective plate integrated liquid crystal display panel that does not cause defects in an optical sheet even if time passes after the protective plate is attached.

In order to solve the above problems, according to one aspect of the present invention,
A liquid crystal display panel in which liquid crystal is sandwiched between a pair of transparent substrates, and a front optical sheet is attached to the front surface of the front transparent substrate disposed on the front side of the pair of transparent substrates;
A protective plate disposed opposite to the front side of the liquid crystal display panel;
A protective plate integrated liquid crystal display panel comprising: a resin layer that joins the liquid crystal display panel and the protective plate;
A transparent sheet is provided between the liquid crystal display panel and the resin layer, and further includes a transparent sheet attached to the liquid crystal display panel so as to cover a predetermined area on the front surface and a predetermined area on the end surface of the front optical sheet. A protective plate integrated liquid crystal display panel is provided.

In the protective plate-integrated liquid crystal display panel, preferably, the front optical sheet includes a polarizing plate.
In the protection plate integrated liquid crystal display panel, preferably, the transparent sheet is provided so as to cover the entire front surface and the entire end surface of the front optical sheet.
In the above protection plate-integrated liquid crystal display panel, preferably, the resin layer is provided in a region inside the outer peripheral edge of the transparent sheet on the front surface of the transparent sheet.
In the protective plate-integrated liquid crystal display panel, preferably, the outer peripheral edge of the transparent sheet extends to the side of the liquid crystal display panel.
In the protection plate integrated liquid crystal display panel, preferably, the transparent sheet includes an end surface of the front transparent substrate, an end surface of the rear transparent substrate disposed on the rear side of the pair of transparent substrates, and the rear transparent substrate. It is provided so as to cover any predetermined region of the rear surface.
In the protection plate integrated liquid crystal display panel, preferably, the transparent sheet is a rear surface of the rear optical sheet that is attached to a rear surface of the rear transparent substrate disposed on the rear side of the pair of transparent substrates. It is provided so as to cover a predetermined area and not overlap the display area of the liquid crystal display panel on the rear side of the liquid crystal display panel.
In the protective plate integrated liquid crystal display panel, preferably, a spacer for providing a gap between the liquid crystal display panel and the protective plate is provided so as not to overlap a display area of the liquid crystal display panel.

  According to the present invention, since the optical sheet is covered with the transparent sheet, the resin layer does not come into contact with the optical sheet, and it is possible to prevent the optical sheet from being defective even if time passes.

It is a front view of the protection plate integrated liquid crystal display panel in 1st Embodiment. FIG. 2 is an arrow cross-sectional view of a surface along the cutting line II-II shown in FIG. 1, which is an end portion of the protection plate-integrated liquid crystal display panel according to the first embodiment. It is sectional drawing of the edge part of the liquid crystal display panel integrated with the protective plate in 2nd Embodiment. It is sectional drawing of the edge part of the liquid crystal display panel integrated with the protective plate in 3rd Embodiment. It is sectional drawing of the edge part of the protection plate integrated liquid crystal display panel in 4th Embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. 1 is a front view of the liquid crystal display panel 1 with an integrated protective plate, and FIG. 2 is an end portion of the liquid crystal display panel 1 with an integrated protective plate, which is a surface along the section line II-II shown in FIG. It is arrow sectional drawing.

  The protection plate integrated liquid crystal display panel 1 is attached so as to cover the liquid crystal display panel 2 having the first optical sheet (front optical sheet) 8 attached to the front surface and the front surface 81 and the end surface 82 of the first optical sheet 8. The transparent sheet 3, the protective plate 5 disposed opposite to the liquid crystal display panel 2, and the resin layer 4 interposed between the transparent sheet 3 and the protective plate 5 to join them.

  The liquid crystal display panel 2 has a predetermined gap between a first transparent substrate (front transparent substrate) 6 disposed on the front side (observation side) and a second transparent substrate (rear side transparent substrate) 7 disposed on the rear side. And a liquid crystal layer (not shown) is sealed in the gap. First and second transparent electrodes (not shown) are provided on the inner surfaces of the first transparent substrate 6 and the second transparent substrate 7 facing each other. The first and second transparent electrodes form a plurality of pixels that control the transmission of light by changing the alignment state of the liquid crystal molecules of the liquid crystal layer by applying a voltage. A first optical sheet 8 is attached to the front surface of the first transparent substrate 6, and a second optical sheet (rear side optical sheet) 9 is attached to the back surface of the second transparent substrate 7. The first optical sheet 8 and the second optical sheet 9 may be a polarizing plate, or may be a laminate of a polarizing plate and a retardation plate. Further, the second transparent substrate 7 is formed with an overhang portion 71 that projects from the first transparent substrate 6. A flexible wiring board 10 that supplies a control signal from an external circuit to a driver element (not shown) is connected to the overhang portion 71.

  The first optical sheet 8 attached to the front surface of the first transparent substrate 6 is formed to be smaller than the outer shape of the first transparent substrate 6 and is provided so that the front peripheral edge 62 of the first transparent substrate 6 is exposed. ing. Further, the second optical sheet 9 attached to the rear surface of the second transparent substrate 7 is formed in substantially the same shape as the first optical sheet 8, and the rear peripheral edge portion 72 and the overhanging portion 71 of the second transparent substrate 7 are formed. It is provided to be exposed. Here, a portion exposed from the first optical sheet 8 in the front surface of the first transparent substrate 6 is referred to as a front peripheral edge 62, and a portion exposed from the second optical sheet 9 in the rear surface of the second transparent substrate 7 is referred to as a front peripheral edge 62. This is referred to as a rear peripheral edge 72. A display area 21 is formed inside the region where the first transparent substrate 6, the second transparent substrate 7, the first optical sheet 8, and the second optical sheet 9 overlap.

The transparent sheet 3 is a film made of a resin such as polyethylene terephthalate (PET), and an adhesive layer is provided on the surface facing the liquid crystal display panel 2. The transparent sheet 3 is attached in contact with and covers the entire front surface 81, the entire end surface 82, and the entire front peripheral edge 62 of the first transparent substrate 6 of the first optical sheet 8. The transparent sheet 3 covers the front surface 81 and the end surface 82 of the first optical sheet 8, thereby preventing the resin layer 4 from contacting the first optical sheet 8. The outer peripheral edge 31 of the transparent sheet 3 extends toward the side of the liquid crystal display panel 2 and is provided so as not to overlap the liquid crystal display panel 2 when viewed from the front.
In addition, the transparent sheet 3 may cover this in the state which does not contact the end surface 82 of the 1st optical sheet 8. FIG.

  The protective plate 5 is made of tempered glass or high-strength transparent resin, and is formed to be larger than the outer shape of the liquid crystal display panel 2. The protective plate 5 is disposed opposite to the front side of the liquid crystal display panel 2 and is joined to the front surface of the transparent sheet 3 via the resin layer 4.

  The resin layer 4 is provided between the transparent sheet 3 and the protective plate 5 and is formed by polymerizing an ultraviolet curable resin. The ultraviolet curable resin is polymerized between the transparent sheet 3 and the protective plate 5 so that the transparent sheet 3 and the protective plate 5 are joined. The resin layer 4 is provided on the inner side of the outer peripheral edge 31 of the transparent sheet 3 on the front side of the transparent sheet 3. Thereby, the resin layer 4 does not contact the end surface of the transparent sheet 3, and the resin layer 4 is more reliably prevented from contacting the first optical sheet 8.

  In manufacturing such a protection plate integrated liquid crystal display panel 1, the transparent sheet 3 is pasted on the front surface of the liquid crystal display panel 2, and an unpolymerized ultraviolet curable resin is filled on the front surface of the transparent sheet 3. . The protective plate 5 is overlapped on the front side of the liquid crystal display panel 2 to bring the liquid crystal display panel 2 and the protective plate 5 closer to each other, thereby spreading the ultraviolet curable resin and irradiating the ultraviolet curable resin with ultraviolet rays in this state. As a result, the unpolymerized ultraviolet curable resin is polymerized, the protective plate 5 and the transparent sheet 3 are joined, and the protective plate 5 can be attached to the front side of the liquid crystal display panel 2.

As described above, according to the first embodiment, since the first optical sheet 8 is covered with the transparent sheet 3, the resin layer 4 is prevented from coming into contact with the first optical sheet 8, and after the protective plate 5 is attached. It can suppress that a defect generate | occur | produces in the 1st optical sheet 8. FIG.
Further, since the resin layer 4 is provided on the front surface of the transparent sheet 3 and on the inner side of the outer peripheral edge 31 of the transparent sheet 3, the resin layer 4 does not come into contact with the end surface of the transparent sheet 3, and the resin layer 4 Can be reliably prevented from coming into contact with the first optical sheet 8.
Furthermore, since the outer peripheral edge 31 of the transparent sheet 3 is provided so as to extend toward the side of the liquid crystal display panel 2, even if there is some error in the molding size of the transparent sheet 3, this can be allowed. Similarly, even if there is a slight error in the mounting position of the transparent sheet 3, this can be allowed. Therefore, the molding operation and attachment operation of the transparent sheet 3 are facilitated.

<Second Embodiment>
A second embodiment of the present invention will be described with reference to FIG. Description of portions corresponding to the first embodiment is omitted.

FIG. 3 is a cross-sectional view of an end portion of the protection plate integrated liquid crystal display panel 1A according to the second embodiment.
In the second embodiment, the size of the first optical sheet 8a is different from the size of the second optical sheet 9a, and the first optical sheet 8a is formed to be approximately the same size as the front surface of the first transparent substrate 6a. Has been. Therefore, the front peripheral edge 62a of the first transparent substrate 6a is small, and the contact area between the transparent sheet 3a and the first transparent substrate 6a is also small.

  The transparent sheet 3a covers the front side of the liquid crystal display panel 2a and is folded back across the side surface of the liquid crystal display panel 2a to cover a part of the rear side of the liquid crystal display panel 2a. That is, the transparent sheet 3a includes the end surface 63a of the first transparent substrate 6a, the end surface 73a of the second transparent substrate 7a, and the front surface peripheral portion 62a of the first transparent substrate 6a in addition to the front surface 81a and the end surface 82a of the first optical sheet 8a. A part of the rear peripheral edge 72a of the second transparent substrate 7a is attached in contact with and covers these parts. The outer peripheral edge 31a of the transparent sheet 3a is provided so as to overlap the surface of the rear peripheral edge 72a of the second transparent substrate 7a when viewed from the front.

  According to the second embodiment, the same effect as the first embodiment described above can be obtained, and even if the contact area between the transparent sheet 3a and the first transparent substrate 6a is small, the transparent sheet 3a. The liquid crystal display panel 2a can be securely bonded with a sufficient contact area.

<Third Embodiment>
A third embodiment of the present invention will be described with reference to FIG. A description of portions corresponding to the first embodiment is omitted.

FIG. 4 is a cross-sectional view of an end portion of the protection plate integrated liquid crystal display panel 1B according to the third embodiment.
The transparent sheet 3b in the third embodiment covers the front side of the liquid crystal display panel 2b and is folded back across the side surface of the liquid crystal display panel 2b to cover a part of the rear side of the liquid crystal display panel 2b. . That is, the transparent sheet 3b includes, in addition to the front surface 81b, the end surface 82b of the first optical sheet 8b, and the front peripheral edge 62b of the first transparent substrate 6b, the end surface 63b of the first transparent substrate 6b, the end surface 73b of the second transparent substrate 7b, The second transparent substrate 7b is affixed in contact with the rear surface peripheral edge 72b, the end surface 92b of the second optical sheet 9b, and a part of the rear surface 91b of the second optical sheet 9b, and covers these. A portion of the transparent sheet 3b that covers a part of the rear surface 91b of the second optical sheet 9 is provided so as not to overlap the display area 21b. The outer peripheral edge 31b of the transparent sheet 3b is provided so as to overlap the surface of the rear surface 91b of the second optical sheet 9 when viewed from the front.
Note that the transparent sheet 3b may cover the second optical sheet 9b without contacting the end surface 92b.

  According to the third embodiment, the same effect as that of the first embodiment described above can be obtained, and the transparent sheet 3b is attached to the liquid crystal display panel 2b in a wide range. The bonding area between 3b and the liquid crystal display panel 2b can be increased, and the transparent sheet 3b can be more reliably attached.

<Fourth embodiment>
A fourth embodiment of the present invention will be described with reference to FIG. A description of portions corresponding to the first embodiment is omitted.

FIG. 5 is a cross-sectional view of an end portion of the protection plate integrated liquid crystal display panel 1C according to the fourth embodiment.
In the protection plate integrated liquid crystal display panel 1C, a spacer 11c is provided at a position between the transparent sheet 3c and the protection plate 5c and not overlapping the display area 21c. The spacer 11c is, for example, a resin film having adhesive layers on both sides. The spacer 11c is provided corresponding to the step formed on the front surface of the transparent sheet 3c, one surface is attached to the rear surface of the protective plate 5c, and the other surface is attached to the front surface of the transparent sheet 3c. The spacer 11c regulates the distance between the transparent sheet 3c and the protective plate 5c to be constant, and covers the peripheral edge of the first optical sheet 8c and the front peripheral edge 62c of the first transparent substrate 6c. It is provided as follows. The spacer 11c is provided so as to surround the display area 21c of the liquid crystal display panel 2c, and an air escape port is formed to communicate between the side where the display area 21c is provided and the opposite side of the spacer 11c. It is provided so that.

  In manufacturing the protection plate integrated liquid crystal display panel 1C, first, the transparent sheet 3c is attached to the front surface of the liquid crystal display panel 2c. Subsequently, a spacer 11c is attached to a position on the front surface of the transparent sheet 3c so as not to overlap the display area 21c, and an unpolymerized UV-curing property is formed in a region surrounded by the spacer 11c on the front surface of the transparent sheet 3c. Fill with resin. The protective plate 5c is overlapped on the front side of the liquid crystal display panel 2c, and the liquid crystal display panel 2c and the protective plate 5c are brought close to each other to spread the ultraviolet curable resin. In this state, the ultraviolet curable resin is irradiated with ultraviolet rays. As a result, the unpolymerized ultraviolet curable resin is polymerized, the protective plate 5c and the transparent sheet 3c are joined, and the protective plate 5c can be attached to the front side of the liquid crystal display panel 2c.

According to the fourth embodiment, the same effect as that of the first embodiment described above can be obtained, and the spacer 11c is provided so as to surround the display area 21c of the liquid crystal display panel 2c. The area where 4c flows out on the transparent sheet 3c can be reduced. Thereby, it can prevent more reliably that the resin layer 4c contacts the 1st optical sheet 8c.
Further, according to the fourth embodiment, since the spacer 11c having a predetermined thickness is provided between the transparent sheet 3c attached to the liquid crystal display panel 2c and the protective plate 5c, an ultraviolet curable resin is provided. Since the distance between the transparent sheet 3c and the protective plate 5c is regulated to be constant by the spacer 11c, the distance between the liquid crystal display panel 2c and the protective plate 5c can be easily regulated. .
Furthermore, according to the fourth embodiment, the spacer 11c is provided so as to form an air escape port that communicates between the side where the display area 21c is provided and the opposite side with respect to the spacer 11c. Therefore, when the ultraviolet curable resin is spread, air flows out to the side opposite to the side where the display area 21c is provided with respect to the spacer 11c through the air escape port. Can be filled easily.

  In each of the embodiments described above, the resin layer is formed by polymerizing an ultraviolet curable resin, but may be formed by polymerizing a thermosetting resin.

DESCRIPTION OF SYMBOLS 1 Protective plate integrated liquid crystal display panel 2 Liquid crystal display panel 3 Transparent sheet 4 Resin layer 5 Protective plate 6 First transparent substrate (front transparent substrate)
7 Second transparent substrate (rear transparent substrate)
8 First optical sheet (front optical sheet)
9 Second optical sheet (rear optical sheet)
11c Spacer 21 Display area 31 Outer peripheral edge 63 End surface 73 End surface 81 Front surface 82 End surface 91b Rear surface

Claims (8)

A liquid crystal display panel in which liquid crystal is sandwiched between a pair of transparent substrates, and a front optical sheet is attached to the front surface of the front transparent substrate disposed on the front side of the pair of transparent substrates;
A protective plate disposed opposite to the front side of the liquid crystal display panel;
A protective plate integrated liquid crystal display panel comprising: a resin layer that joins the liquid crystal display panel and the protective plate;
A transparent sheet is provided between the liquid crystal display panel and the resin layer, and further includes a transparent sheet attached to the liquid crystal display panel so as to cover a predetermined area on the front surface and a predetermined area on the end surface of the front optical sheet. LCD panel with integrated protective plate.   The protective plate-integrated liquid crystal display panel according to claim 1, wherein the front optical sheet includes a polarizing plate.   The protection plate-integrated liquid crystal display panel according to claim 2, wherein the transparent sheet is provided so as to cover the entire front surface and the entire end surface of the front optical sheet.   4. The protection plate-integrated liquid crystal display panel according to claim 2, wherein the resin layer is provided in a region inside the outer peripheral edge of the transparent sheet on the front surface of the transparent sheet.   5. The protection plate-integrated liquid crystal display panel according to claim 2, wherein an outer peripheral edge of the transparent sheet extends to a side of the liquid crystal display panel.   The transparent sheet covers a predetermined region of any one of an end surface of the front transparent substrate, an end surface of a rear transparent substrate disposed on the rear side of the pair of transparent substrates, and a rear surface of the rear transparent substrate. The protective plate integrated liquid crystal display panel according to claim 2, wherein the protection plate integrated liquid crystal display panel is provided.   The transparent sheet covers a predetermined region of the rear surface of the rear optical sheet attached to the rear surface of the rear transparent substrate disposed on the rear side of the pair of transparent substrates, and is behind the liquid crystal display panel. The protective plate-integrated liquid crystal display panel according to claim 2, which is provided so as not to overlap a display area of the liquid crystal display panel on the side.   The spacer for providing a gap between the liquid crystal display panel and the protective plate is provided so as not to overlap the display area of the liquid crystal display panel. The protective plate-integrated liquid crystal display panel described in the above item.

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