JP2009025602A - Pressure-sensitive adhesive double coated tape for liquid crystal cell adhesion, backlight unit, liquid crystal display device and method for manufacturing liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which facilitates bonding operation and achieves price-reduction with respect to a liquid crystal display device in which an optical member is bonded to a liquid crystal cell with a pressure-sensitive adhesive double coated tape having a protective separator. <P>SOLUTION: In the liquid crystal display device with an optical member bonded to a liquid crystal cell with a pressure-sensitive adhesive double coated tape having a protective separator, a slit is made in the protective separator of the pressure-sensitive adhesive double coated tape, and a part of the protective separator of the pressure-sensitive adhesive double coated tape is interposed in a step part formed by a transparent substrate and a polarizing plate constituting the liquid crystal cell. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double-sided pressure-sensitive adhesive tape for bonding a liquid crystal cell, a backlight unit, a liquid crystal display device, and a method for manufacturing a liquid crystal display device, and more particularly to an improvement in a configuration in which an optical member is bonded to a liquid crystal cell using a double-sided pressure-sensitive adhesive tape.

  Currently, a liquid crystal display device having a structure in which an optical member such as a diffusion sheet or a prism sheet, which is a constituent element of a backlight, is bonded to a liquid crystal cell using a double-sided adhesive tape is used. (For example, refer to Patent Document 1).

  Since this double-sided adhesive tape is supplied in a state in which a frame-shaped adhesive layer in which a window having a shape matching the display area of the liquid crystal cell is covered with a protective separator as shown in Patent Document 1, the liquid crystal cell and the optical member When adhering, it is necessary to position the optical separator on the display area of the liquid crystal cell with the protective separator of the double-sided pressure-sensitive adhesive tape peeled off, and to adhere the optical member with high accuracy. For this reason, since a complicated bonding jig is used as shown in Patent Document 1, an increase in manufacturing cost due to an increase in the number of bonding steps has been a problem.

 In response to this problem, a non-sticky positioning member has recently been provided in a part of the frame-shaped pressure-sensitive adhesive layer, and the positioning member is positioned on the liquid crystal cell to facilitate adhesion between the liquid crystal cell and the optical member. The way to do is done. Hereinafter, an adhesion method between a liquid crystal cell and an optical member using a positioning member in the prior art will be described with reference to the drawings.

  7 to 10 show a liquid crystal display device and a double-sided pressure-sensitive adhesive tape according to the prior art, FIG. 7 is a sectional view of the liquid crystal display device, FIG. 8 is a perspective view of a double-sided pressure-sensitive adhesive tape with a protective separator, and FIG. FIG. 10 is an exploded perspective view of the double-sided pressure-sensitive adhesive tape.

  FIG. 7 is a cross-sectional view of a liquid crystal display device in which a liquid crystal cell and an optical member are bonded with a double-sided adhesive tape. The liquid crystal display device 100 is an optical member such as a reflection sheet 2, a light guide plate 3, and a diffusion plate from the bottom side of the lower case 50. 40 are sequentially laminated, and the liquid crystal cell 20 is bonded to the upper surface of the optical member 40 by an adhesive member 30a. The liquid crystal cell 20 is composed of two transparent substrates 21 and 22 having different sizes and two deflecting plates 23 and 24 bonded to both surfaces of the transparent substrates 21 and 22. A driving electrode of the liquid crystal cell 20 is led out to a flange portion 21 a formed by the transparent substrates 21 and 22.

Further, the shape of the polarizing plate 23 bonded to the back surface side of the transparent substrate 21 having a large shape is smaller than the shape of the transparent substrate 21, and as a result, the transparent substrate 21 and the polarizing plate 23 are disposed on the back surface side of the flange portion 21 a of the transparent substrate 21. A stepped portion 21b is formed. In addition, the liquid crystal cell 20 and the optical member 40 are formed by an adhesive member 30a provided with a frame-shaped adhesive layer 31 constituting a double-sided adhesive tape described later and a strip-shaped resin member 32 having no adhesiveness. It is glued. In this bonding method, the strip-shaped resin member 32 having no adhesiveness of the bonding member 30 a is positioned on the stepped portion 21 b of the liquid crystal cell 20, and by this positioning, the adhesive layer 31 is accurately positioned with respect to the display area of the liquid crystal cell 20. Glue. Then, the liquid crystal cell 20 in which the adhesive member 30 a is integrated is bonded to the optical member 40 to complete.
In addition, as this bonding method, the method in which the bonding member 30a is previously integrated on the liquid crystal cell 20 side and then bonded to the optical member 40 has been shown, but as the opposite method, the bonding member 30a is bonded to the optical member 40 in advance. Then, the liquid crystal cell 20 may be positioned and bonded by the strip-shaped resin member 32.

  Reference numeral 4 denotes an FPC (Flexible Printed Circuit), which is electrically connected to the flange portion 21a of the liquid crystal cell 20 and led to the outside through the cutout portion 51 of the lower case 50, whereby an external circuit (not shown) is used. The driving signal is supplied to the liquid crystal cell 20. An LED 5 as a light source is disposed in the recess 52 of the lower case 50, and the liquid crystal cell 20 is illuminated through the light guide plate 3. Furthermore, the upper case 60 having the parting window 61 corresponding to the display area of the liquid crystal cell 20 is attached to the lower case 50, whereby the liquid crystal display device 100 is completed.

FIG. 8 is a perspective view of a conventional double-sided pressure-sensitive adhesive tape, and FIG. 9 is a cross-sectional view of the double-sided pressure-sensitive adhesive tape shown in FIG. As shown in FIGS. 8 and 9, the double-sided pressure-sensitive adhesive tape 30 has the lower surface of the pressure-sensitive adhesive layer 31 bonded to the mount 33, and the upper surface of the pressure-sensitive adhesive layer 31 is protected by a protective separator 34. The adhesive layer 31 is generally known as a Rim sheet. Adhesive layers 31b and 31c are provided on both sides of a light shielding sheet 31a for preventing deterioration in display quality due to light leakage from an adhesive portion. Yes. Further, as shown in the drawing, a strip-shaped resin member 32 is bonded to the end of the adhesive layer 31b by turning the end of the protective separator 34. And the adhesion member 30a is comprised by the adhesive layer 31 and the strip-shaped resin member 32 adhere | attached on the edge part. The strip-shaped resin member 32 is used for positioning, blocking light from the liquid crystal cell side, and filling a gap between the step portions 21b.
In addition, as this strip-shaped resin member 32, the sheet | seat of PET (polyethylene terephthalate) is used as an example, and the thickness of PET is 100 micrometers-with respect to the thickness (for example, 200 micrometers-300 micrometers) of the polarizing plate 23. The thing of 350 micrometers is used.

  FIG. 10 is a perspective view showing a state where the backing sheet 33 and the protective separator 34 of the double-sided pressure-sensitive adhesive tape 30 shown in FIGS. 8 and 9 are peeled off. As shown in the figure, by separating the backing sheet 33 and the protective separator 34 from the double-sided adhesive tape 30, an adhesive member 30a constituted by the adhesive layer 31 and the strip-shaped resin member 32 adhered to the end thereof is exposed. As shown in FIG. 7, the liquid crystal cell 20 and the optical member 40 are bonded using the bonding member 30a.

JP 2006-65055 A

  However, in contrast to the method using the bonding jig shown in Patent Document 1, the bonding method between the liquid crystal cell and the optical member using the positioning member in the prior art uses a positioning member that does not require a jig and has no adhesiveness. This is excellent in that the liquid crystal cell and the optical member can be easily positioned and bonded, but has the following problems.

  In other words, since the PET as a positioning member is attached to the double-sided adhesive tape, it is necessary to prepare the PET as a separate member. In addition to the cost increase due to the increase in the number of parts, the cost due to the mounting man-hours is increased, and the product price is increased. There is a problem that it becomes expensive.

In addition, as shown in FIG. 9, the end of the protective separator is turned over by adhering PET to the adhesive layer of the double-sided adhesive tape. As a result, when the adhesive member is peeled off from the mount, If the separator is turned over, the protective member may be peeled off without the adhesive member being peeled off, resulting in a marked deterioration in workability.
Furthermore, since the protective separator has a turned-up portion, dust enters from the turned-up portion and adheres to the display screen of the liquid crystal cell to which the dust is adhered, causing a display defect.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and in a liquid crystal display device in which an optical member is bonded to a liquid crystal cell with a double-sided adhesive tape provided with a protective separator, a liquid crystal display that facilitates bonding and at the same time reduces the cost. To provide an apparatus.

  The structure of the present invention for achieving the above object is a double-sided pressure-sensitive adhesive tape in which a liquid crystal cell is bonded to an optical member constituting a backlight unit. The double-sided pressure-sensitive adhesive tape includes a pressure-sensitive adhesive layer and a protective separator, and the pressure-sensitive adhesive layer. Has an opening corresponding to the display area of the liquid crystal cell and an adhesive area around the opening, and the protective separator is transparent to the liquid crystal cell when a double-sided adhesive tape is bonded to the liquid crystal cell. A double-sided pressure-sensitive adhesive tape for bonding liquid crystal cells, wherein a slit is formed in an adhesive region corresponding to a step portion between a substrate and a polarizing plate.

  When the double-sided pressure-sensitive adhesive tape is bonded to the liquid crystal cell with the above configuration, a part separated by the slit of the protective separator of the double-sided pressure-sensitive adhesive tape can be used as a strip-shaped resin member.

  A backlight characterized in that a double-sided adhesive tape having a slit formed in a protective separator is attached to an optical member that constitutes an emission surface of a backlight unit that includes a light source, a light guide member, and an optical member housed in a case body. Is a unit.

  In a liquid crystal display device in which a liquid crystal cell and an optical member constituting a backlight unit are bonded with a double-sided pressure-sensitive adhesive tape provided with a protective separator, a slit is provided in the protective separator of the double-sided pressure-sensitive adhesive tape, and the transparent substrate constituting the liquid crystal cell; A part separated by the slit of the protective separator of the double-sided pressure-sensitive adhesive tape is interposed in a step portion with respect to the polarizing plate.

  According to the above configuration, since a part of the protective separator is used as the strip-shaped resin member of the double-sided adhesive tape, there is no need to prepare a strip-shaped resin member as a separate member, and the strip-shaped resin member Since it is not necessary to bond in advance, the bonding work is facilitated, which has a great effect on the cost reduction of the liquid crystal display device. In addition, since there is no display defect due to the intrusion of dust from the turned-up portion of the protective separator, it is effective in improving the reliability of the liquid crystal display device.

  A part of the protective separator is a spacer at a step portion between the transparent substrate and the polarizing plate constituting the liquid crystal cell.

  In a manufacturing method of a liquid crystal display device in which an optical member is bonded to a liquid crystal cell with a double-sided pressure-sensitive adhesive tape provided with a protective separator, a separator that is not peeled off by a protective separator by forming a slit in the protective separator attached to the double-sided pressure-sensitive adhesive tape surface A residual portion is formed, and the separator residual portion of the double-sided pressure-sensitive adhesive tape is positioned at a step portion between a transparent substrate and a polarizing plate constituting the liquid crystal cell, and the liquid crystal cell and the optical member are bonded.

  According to the above manufacturing method, by forming a slit in the protective separator attached to the double-sided pressure-sensitive adhesive tape surface, a strip-shaped resin member can be formed simply by leaving a separator remaining portion that is not peeled off from the protective separator. In addition, it is possible to omit parts procurement and bonding processes related to the formation of a conventional strip-shaped resin member, which has a great effect on cost reduction of the liquid crystal display device.

  The double-sided pressure-sensitive adhesive tape has a shape that covers a transparent substrate of the liquid crystal cell, and a slit of a protective separator is formed in the range of the stepped portion.

  As described above, in the present invention, it is not necessary to prepare a special strip-shaped resin member, and it is not necessary to bond the strip-shaped resin member in advance. It has a great effect on cost reduction. In addition, since there is no display defect due to the intrusion of dust from the turned-up portion of the protective separator, it is effective in improving the reliability of the liquid crystal display device.

  Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show a liquid crystal display device and a double-sided adhesive tape according to an embodiment of the present invention. FIG. 1 is a sectional view of the liquid crystal display device, and FIG. 2 is a partially enlarged sectional view of the liquid crystal display device shown in FIG. 3 is a perspective view of a double-sided pressure-sensitive adhesive tape with a protective separator, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is an exploded perspective view of the double-sided pressure-sensitive adhesive tape. The basic configuration of the present invention is the same as that of the conventional liquid crystal display device and double-sided pressure-sensitive adhesive tape shown in FIGS. 7 to 10, and the same elements are denoted by the same reference numerals and redundant description is omitted.

  FIG. 1 is a cross-sectional view of a liquid crystal display device in which a liquid crystal cell and an optical member are bonded with a double-sided adhesive tape, and the basic configuration is the same as that of the conventional liquid crystal display device 100 shown in FIG. In the liquid crystal display device 10 of the present invention, a reflecting sheet 2, a light guide plate 3, a diffusion plate 6 as an optical member, and two prism sheets 7 and 8 arranged orthogonally are sequentially laminated from the bottom surface side of the lower case 50. The liquid crystal cell 20 is bonded to the upper surface of 8 by an adhesive member 30a. The liquid crystal cell 20 is composed of two transparent substrates 21 and 22 having different sizes and two deflecting plates 23 and 24 bonded to both surfaces of the transparent substrates 21 and 22. A driving electrode of the liquid crystal cell 20 is led out to a flange portion 21 a formed by the transparent substrates 21 and 22.

  Further, the shape of the polarizing plate 23 bonded to the back surface side of the transparent substrate 21 having a large shape is smaller than the shape of the transparent substrate 21, and as a result, the transparent substrate 21 and the polarizing plate 23 are disposed on the back surface side of the flange portion 21 a of the transparent substrate 21. A stepped portion 21b is formed. Further, the liquid crystal cell 20 is formed by an adhesive member 30a having a frame-shaped adhesive layer 31 constituting a double-sided adhesive tape, which will be described later, and a separator remaining portion 34a left unremoved as a strip-shaped resin member at the end thereof. A prism sheet 8 as an optical member is bonded.

FIG. 2 is a partially enlarged cross-sectional view in which the portions of the flange portion 21a and the step portion 21b of the transparent substrate 21 in the liquid crystal display device 10 shown in FIG. 1 are enlarged.
In this bonding method, as shown in FIG. 2, the non-sticky separator remaining portion 34a of the bonding member 30a is positioned on the stepped portion 21b of the liquid crystal cell 20, and by this positioning, the pressure-sensitive adhesive layer 31 is positioned with respect to the display area of the liquid crystal cell 20. Glue accurately. That is, when the bonding member 30a and the liquid crystal cell 20 are bonded, if the entire bonding member 30a is sticky, there is a disadvantage that the two members stick together without being determined in position. Positioning is performed by leaving the separator remaining portion 34a having no adhesiveness in a part of the liquid crystal cell and sliding the transparent substrate of the liquid crystal cell on the portion of the separator remaining portion 34a having no adhesiveness. Then, the liquid crystal cell 20 integrated with the adhesive member 30a is adhered to the prism sheet 8 which is an optical member.
In addition, as the bonding method, the method in which the bonding member 30a is previously integrated on the liquid crystal cell 20 side and then bonded to the prism sheet 8 has been shown, but as the opposite method, the bonding member 30a is bonded to the prism sheet 8 in advance. Then, the liquid crystal cell 20 may be positioned and bonded by the separator remaining portion 34a.

  Further, as shown in FIG. 1, a protrusion 50 a is provided on the lower surface side of the lower case 50 in the present invention, and the FPC 4 electrically connected to the flange portion 21 a of the liquid crystal cell 20 passes through the notch 51 of the lower case 50. After being led out to the outside, it is bent to the back side of the lower case 50, and a fixing hole 4a provided for fixing is fitted into a protrusion 50a provided on the lower surface side of the lower case 50 and fixed. That is, the protrusion 50a provided on the lower case 50 is thermally crimped as indicated by a dotted line in a state where the fixing hole 4a of the FPC 4 is fitted, so that the FPC 4 is arranged on the back surface side and a drive signal from an external circuit (not shown) is received. It is configured to input from the back side. Further, when the protrusion 50a is caulked by heat, pressure is applied to the stepped portion 21b, and the strain generated in the liquid crystal cell 20 is mitigated by the separator remaining portion 34a serving as a spacer.

  3 is a perspective view of the double-sided pressure-sensitive adhesive tape of the present invention, FIG. 4 is a cross-sectional view taken along the line AA of the double-sided pressure-sensitive adhesive tape shown in FIG. 3, and the basic structure of the conventional double-sided pressure-sensitive adhesive tape 30 shown in FIGS. Are the same. That is, as shown in FIGS. 3 and 4, the double-sided adhesive tape 35 of the present invention has the lower surface of the adhesive layer 31 adhered to the mount 33, and the upper surface of the adhesive layer 31 is protected by the protective separator 34. It is the same as the conventional double-sided pressure-sensitive adhesive tape 30 that the Rim sheet has adhesive layers 31b and 31c provided on both sides of the light-shielding sheet 31a. However, the difference between the double-sided pressure-sensitive adhesive tape 35 of the present invention and the conventional double-sided pressure-sensitive adhesive tape 30 is the difference in the configuration of the strip-shaped resin member provided on the pressure-sensitive adhesive layer 31b.

  That is, in the conventional double-sided pressure-sensitive adhesive tape 30, as the configuration of the strip-shaped resin member 32, the end portion of the protective separator 34 is turned and another member such as PET is attached to the end portion of the pressure-sensitive adhesive layer 31 b. In the adhesive tape 35, the protective separator 34 is divided into a separator peeling portion 34 c and a separator remaining portion 34 a that is not peeled by providing a slit 34 b in a part of the protective separator 34.

  The formation of the slit 34b in the double-sided adhesive tape 35 of the present invention will be described in detail. The adhesive layer 31 is provided with an opening 31e corresponding to the display area of the liquid crystal cell 20, and a frame-shaped adhesive area is formed around the opening 31e. ing. The position of the slit 34 b formed in the protective separator 34 is formed in the adhesion region of the adhesive layer 31 corresponding to the step portion 21 b between the transparent substrate 21 and the polarizing plate 23 of the liquid crystal cell 20. In addition, as a formation method of the slit 34b, there exist a half cut, perforation processing, etc.

  FIG. 5 is a perspective view showing a state where the backing sheet 33 and the protective separator 34 of the double-sided adhesive tape 35 shown in FIG. 3 are peeled off. As shown in the figure, when only the separator 33 c of the backing sheet 33 and the protective separator 34 is peeled from the double-sided adhesive tape 35, the adhesive member 30 a remains in the state where the separator remaining portion 34 a remains as a strip-shaped resin member at the end of the adhesive layer 31. Is exposed. Then, as shown in FIG. 1, positioning and adhesion between the liquid crystal cell 20 and the prism sheet 8 are performed using the separator remaining portion 34a of the adhesive member 30a as a strip-shaped resin member.

  Note that the thickness of the protective separator 34 is 100 μm to 350 μm with respect to the thickness of the polarizing plate 23 (for example, 200 μm to 300 μm). The double-sided adhesive tape 35 has a shape that covers the transparent substrate 21 of the liquid crystal cell 20, and a slit 34 b that is a slit of the protective separator 34 is formed in the range of the step portion 21 b of the liquid crystal cell 20. Therefore, the shape of the separator remaining portion formed by the slit is not limited to the rectangle shown in the embodiment, and it is naturally formed arbitrarily according to the shape of the stepped portion to be positioned.

  FIG. 6 is a cross-sectional view of a backlight unit according to the second embodiment of the present invention. That is, the backlight unit 70 has a configuration in which the liquid crystal cell 20, the FPC 4, and the upper case 60 are excluded from the liquid crystal display device 10 illustrated in FIG. 1, and the prism sheet 8 that is an optical member that configures the emission surface of the backlight unit 70. The double-sided adhesive tape 35 shown in FIG. 3 and FIG. 4 is attached to the surface by peeling off the mount 33.

  That is, the backlight unit 70 is in a state in which the protective sheet 34 provided with the slits 34b is attached to the emission surface, and therefore, after separating only the separator peeling portion 34c of the protective separator 34, the separator remaining portion 34a is changed to a strip-shaped resin. As shown in FIG. 1, the liquid crystal cell 20 is assembled as a member, and the upper case 60 is attached to complete the liquid crystal display device.

  As described above, the double-sided pressure-sensitive adhesive tape 35 according to the present invention is provided with slits 34b in the protective separator 34 in advance, and when the liquid crystal display device 10 is assembled, only the separator peeling portion 34c is peeled to remove the separator remaining portion 34a. Because it can be formed as a member, there is no need for a process such as using a separate PET like conventional double-sided adhesive tape, turning the end of the protective separator and pasting it, and waste in the assembled state of the liquid crystal cell Since the protective separator to be used is used as a strip-shaped resin member, there is no need for extra procurement parts such as PET, and the cost of the liquid crystal display device is greatly reduced.

  As mentioned above, although the technique which uses the protective separator of the double-sided pressure-sensitive adhesive tape in the present invention as a strip-shaped resin member at the time of bonding and as a spacer has been shown for the embodiment used for bonding the liquid crystal cell and the optical member, it is limited to this. Of course, the present invention can be applied to anything that is bonded using a double-sided pressure-sensitive adhesive tape, such as bonding of optical members and assembly of portable devices.

It is sectional drawing of the liquid crystal display device in this invention. It is a partial expanded sectional view of the liquid crystal display device in this invention. It is a disassembled perspective view of the double-sided adhesive tape with a protective separator in this invention. It is AA sectional drawing of the double-sided adhesive tape with a protective separator shown in FIG. It is a disassembled perspective view of the double-sided adhesive tape in this invention. It is sectional drawing of the backlight unit which is 2nd Embodiment of this invention. It is sectional drawing of the conventional liquid crystal display device. It is a perspective view of the conventional double-sided adhesive tape with a protective separator. It is AA sectional drawing of the double-sided adhesive tape with a protective separator shown in FIG. It is a disassembled perspective view of the conventional double-sided adhesive tape.

Explanation of symbols

2 Reflective sheet 3 Light guide plate 4 FPC
5 LED
6 Diffusers 7 and 8 Prism sheet 10 and 100 Liquid crystal display device 20 Liquid crystal cell 21 and 22 Transparent substrate 21a Gutter part 21b Step part 23 and 24 Polarizing plate 30 and 35 Double-sided adhesive tape 30a Adhesive member 31 Adhesive layer 31e Opening part 32 Strip-shaped resin member 33 Mount 34 Protective separator 34a Separator remaining part 34b Slit 34c Separator peeling part 40 Optical member 50 Lower case 60 Upper case 70 Backlight unit

Claims (6)

  In the double-sided pressure-sensitive adhesive tape for bonding the liquid crystal cell to the optical member constituting the backlight unit, the double-sided pressure-sensitive adhesive tape has an adhesive layer and a protective separator laminated, and the adhesive layer has an opening corresponding to the display area of the liquid crystal cell. And an adhesive region is formed around the opening, and the protective separator adheres to the step portion between the transparent substrate of the liquid crystal cell and the polarizing plate in a state where a double-sided adhesive tape is adhered to the liquid crystal cell. A double-sided pressure-sensitive adhesive tape for bonding a liquid crystal cell, wherein a slit is formed in the region.   A backlight unit comprising the double-sided pressure-sensitive adhesive tape according to claim 1 attached to an optical member constituting an emission surface of a backlight unit comprising a light source, a light guide member, and an optical member housed in a case body.   In a liquid crystal display device in which a liquid crystal cell and an optical member constituting a backlight unit are bonded with a double-sided pressure-sensitive adhesive tape provided with a protective separator, a slit is provided in the protective separator of the double-sided pressure-sensitive adhesive tape, and the transparent substrate constituting the liquid crystal cell; A liquid crystal display device, wherein a part separated by a slit of a protective separator of the double-sided pressure-sensitive adhesive tape is interposed in a step portion with respect to a polarizing plate.   4. The liquid crystal display device according to claim 3, wherein a part of the protective separator is a spacer at a step portion between the transparent substrate and the polarizing plate constituting the liquid crystal cell.   In a manufacturing method of a liquid crystal display device in which an optical member is bonded to a liquid crystal cell with a double-sided pressure-sensitive adhesive tape provided with a protective separator, a slit is formed in the protective separator attached to the double-sided pressure-sensitive adhesive tape surface, so that the protective separator does not peel off A method for manufacturing a liquid crystal display device, wherein a separator remaining portion is formed, the separator remaining portion of the double-sided adhesive tape is positioned at a step portion between a transparent substrate and a polarizing plate constituting the liquid crystal cell, and the liquid crystal cell and an optical member are bonded. . 6. The method of manufacturing a liquid crystal display device according to claim 5, wherein the double-sided pressure-sensitive adhesive tape has a shape that covers a transparent substrate of the liquid crystal cell, and a slit of a protective separator is formed in the range of the stepped portion.

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