JP2016038436A - Display panel, and device and method of peeling cover glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate a display panel from a cover glass when a defect is found in a finished display module to improve a regeneration ratio when regenerating respective components.SOLUTION: There is provided a peeling device for a display module having a z-axis adjustment table 200 that controls the position in a z-axis direction arranged below a mounting table 300 on which a display module is mounted, and a fixing unit 600 that fixes a metal plate 100 for cutting an adhesive in a direction parallel to a principal surface of a liquid crystal display panel, where the thickness of the metal plate 100 is smaller than the thickness of the adhesive; the metal plate 100 is applied with a tension by the fixing unit 600; the fixing unit 600 can move the metal plate 100 in the direction parallel to the principal surface of the liquid crystal display panel.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a peeling method and a peeling device for peeling a protective plate attached to the surface of a display panel with an ultraviolet curable resin.

  In the liquid crystal display device, there is a strong demand for reducing the outer dimensions of the set while keeping the screen constant, and at the same time reducing the thickness of the liquid crystal display panel. In order to make the liquid crystal display panel thin, after manufacturing the liquid crystal display panel, the outside of the liquid crystal display panel is polished and thinned.

  When the liquid crystal display panel is made thin, mechanical strength becomes a problem. In other words, if a mechanical pressure is applied to the display surface of the liquid crystal display panel, the liquid crystal display panel may be destroyed. Therefore, when the liquid crystal display panel is incorporated into a set such as a mobile phone, a cover glass is attached to the screen side of the liquid crystal display panel. .

  In order to prevent the liquid crystal display panel from exerting a force when an external force is applied to the cover glass, conventionally, the cover glass has been installed separately from the liquid crystal display panel. However, in such a configuration, as shown in FIG. 12, there arises a problem that an image looks double due to the influence of reflection at the interface between the cover glass 50 and the liquid crystal display panel 30. In other words, in FIG. 12, a part of the light L incident obliquely from the backlight is reflected by the lower surface of the cover glass 50 and is reflected again by the surface of the liquid crystal display panel 30 so as to be visually recognized by human eyes. . In order to prevent this, the cover glass 50 and the liquid crystal display panel 30 are bonded using an adhesive having a refractive index close to that of the glass.

  On the other hand, in recent years, a touch panel type liquid crystal display device in which input is performed by touching the surface of a screen with a finger or a stylus pen has become widespread. In such a configuration, a touch panel is bonded on the liquid crystal display panel, and a cover glass is bonded on the touch panel.

  When a liquid crystal display device having such a configuration is completed and found to be defective, the liquid crystal display device needs to be regenerated and a cover glass, a touch panel, a liquid crystal display panel, or the like must be reused. “Patent Document 1” describes a configuration in which the hardness of the surface side of the protective film of the touch panel is 3-7 in terms of pencil hardness so that the touch panel can be reused.

JP 2013-196551 A

  The technique described in Patent Document 1 improves the reproduction yield by removing the adhesive remaining on the surface of the liquid crystal display panel or touch panel after peeling the liquid crystal display panel or touch panel. On the other hand, the conventional method of peeling the liquid crystal display panel, touch panel or cover glass is to use a thin nylon line for the adhesive between the liquid crystal display panel and the touch panel or the cover glass. By pulling, the adhesive is cut or destroyed, and the liquid crystal display panel and the touch panel or cover glass are peeled off.

  However, in the method using such a line, the thickness of the line needs to be about φ0.14 mm so that the line is not cut. On the other hand, the thickness of the adhesive between the liquid crystal display panel and the touch panel or cover glass is about 0.1 mm. Therefore, during the peeling operation, the line causes stress on the liquid crystal display panel or touch panel, resulting in a decrease in reproduction yield.

  The subject of this invention is providing the peeling method and peeling jig | tool which improve the reproduction | regeneration yield of a liquid crystal display panel, a touch panel, or a cover glass in the peeling process of a liquid crystal display panel, a touch panel, or a cover glass in a reproduction | regeneration process. .

  The present invention overcomes the above problems, and specific means are as follows.

  (1) A peeling device that separates a display module in which a cover glass is bonded to a display panel with an adhesive into the cover glass and the display panel, in the z-axis direction under a mounting table on which the display module is mounted And a fixing unit for fixing a metal plate for cutting the adhesive in a direction parallel to the main surface of the liquid crystal display panel, the thickness of the metal plate being It is smaller than the thickness of the adhesive, and the metal plate is tensioned by the fixing unit, and the fixing unit moves the metal plate in a direction parallel to the main surface of the liquid crystal display panel. A peeling device for a display module, wherein the adhesive material can be cut in a direction parallel to a main surface of the liquid crystal display panel.

  (2) The display module peeling apparatus according to (1), wherein the mounting table includes a heater for heating the display module.

  (3) The display module peeling apparatus according to (1), wherein the metal plate is rotatable in a direction parallel to a main surface of the liquid crystal display panel by the fixing unit.

  (4) The display module peeling apparatus according to (1), wherein the metal plate is stainless steel.

  (5) The display module has a touch panel, and the peeling device uses an adhesive for bonding the display panel and the touch panel, or an adhesive for bonding the touch panel and the cover glass. The peeling apparatus according to (1), which cuts in a direction.

  (6) A peeling method for separating a display module in which a cover glass is bonded to a display panel with an adhesive into the cover glass and the display panel, and the display module is disposed on a heated mounting table Then, the position of the mounting table is set by the z-axis adjustment table so that the tensioned metal plate can be cut in the main surface direction of the display panel, and the metal plate is attached to the display panel. A method of peeling the cover glass from the display module, wherein the adhesive is cut in the direction of the main surface of the display panel by moving in a direction parallel to the direction of the main surface.

  (7) After cutting the adhesive material by a predetermined amount with the metal plate, rotating the metal plate by a predetermined angle, and then moving the metal plate in a direction parallel to the main surface direction of the display panel. The method for peeling the cover glass and the display panel according to (6), wherein the adhesive is cut in a thickness direction.

  (8) The cover glass according to (6), wherein the display module is heated by a heating device different from the device having the mounting table before being mounted on the mounting table. Display panel peeling method.

  (9) The display module in which the cover glass and the touch panel are bonded by the first adhesive and the touch panel and the display panel are bonded by the second adhesive is separated into the cover glass, the touch panel, and the display panel. The display module is arranged on a heated mounting table, and a tensioned metal plate is attached to the display panel using the first adhesive or the second adhesive. The position of the mounting table is set by a z-axis adjusting table so that the first adhesive can be cut in the main surface direction of the display panel, and the metal plate is moved in a direction parallel to the main surface direction of the display panel. Or the said cover glass, the said touch panel, and the peeling method of the said liquid crystal display panel which cut | disconnect the said 2nd adhesive material in the main surface direction of the said display panel

It is sectional drawing of a liquid crystal display device. It is sectional drawing which shows the state which cut | disconnects an adhesive material with a metal plate. It is sectional drawing which shows the state by which the liquid crystal display panel and the cover glass were isolate | separated by cut | disconnecting an adhesive material. It is a perspective view which shows a metal plate. It is a perspective view which shows the peeling apparatus by this invention. It is another perspective view which shows the peeling apparatus by this invention. It is sectional drawing which shows a part of peeling apparatus of this invention. It is a cross-sectional schematic diagram which shows the state which has cut | disconnected the adhesive material with the peeling apparatus of this invention. It is a perspective view of the display module mounting base and z-axis adjustment base in the peeling apparatus of this invention. It is sectional drawing and a top view which show the form of the temperature measurement in the peeling apparatus of this invention. It is sectional drawing which shows the other form of a liquid crystal display device. It is a schematic diagram which shows the problem in the case of not using an adhesive material between a liquid crystal display panel and a cover glass.

  The contents of the present invention will be described in detail below using examples. Although the following embodiments are described using a liquid crystal display device, the contents of the present invention can also be applied to a display device in which a cover glass or a touch panel is disposed on an organic EL display device.

  FIG. 1 is a cross-sectional view of a liquid crystal display device to which the present invention is applied. In FIG. 1, a cover glass 50 is pasted on the liquid crystal display panel 30 via an adhesive 40. The adhesive 40 is a transparent adhesive such as an acrylic resin, and an ultraviolet curable resin is used. In order to suppress reflection at the interface between the cover glass 50 and the liquid crystal display panel 30, a material having a refractive index close to the refractive index of the glass is selected as the adhesive.

  The liquid crystal display panel 30 of FIG. 1 includes a TFT substrate 10, a counter substrate 20, a lower polarizing plate 11 disposed below the TFT substrate 10, and an upper polarizing plate 21 disposed on the counter substrate 20. A cover glass 50 is disposed on the upper polarizing plate 21 of the liquid crystal display panel 30 via an adhesive 40 made of an ultraviolet curable resin. A liquid crystal layer is sandwiched between the TFT substrate 10 and the counter substrate 20. A backlight 80 is disposed on the back surface of the liquid crystal display panel 30.

  In FIG. 1, the touch panel is not displayed, but since there is a product in which the liquid crystal display panel 30 also serves as a touch panel, FIG. 1 corresponds to a configuration including a liquid crystal display device having a touch panel function. In the liquid crystal display panel 30 having a touch panel function, one electrode for a touch panel is disposed outside the counter substrate 20, and the other electrode for the touch panel is disposed inside the liquid crystal display panel 30.

  When a defect is found after the liquid crystal display device is completed, the liquid crystal display device is disassembled, but usable parts are reused through a recycling process. There are also parts that become defective in the regeneration process. In particular, in the peeling operation of peeling the liquid crystal display panel and the cover glass, the liquid crystal display panel or the cover glass is mechanically damaged and often becomes defective.

  The present invention can improve the regeneration rate of parts in this peeling process. FIG. 2 is a cross-sectional view showing a method of peeling the liquid crystal display panel and the cover glass in the present invention. In FIG. 2, the upper polarizing plate 21 and the cover glass 50 of the liquid crystal display panel 30 are attached with an adhesive 40. The adhesive 40 is an ultraviolet curable resin and softens when the temperature is raised.

  In the peeling operation, the liquid crystal display panel 30 is heated to about 80 ° C., and the softened adhesive 40 is cut in the thickness direction by the thin metal plate 100. In FIG. 2, the thickness d of the adhesive 40 is about 0.1 mm. On the other hand, the thickness t of the metal plate 100 is about 0.03 mm. In FIG. 2, the metal plate 100 is pushed in the direction of the arrow, and the adhesive 40 is cut. FIG. 3 is a cross-sectional view showing a state where the adhesive 40 is cut by the metal plate 100 and the liquid crystal display panel 30 and the cover glass 50 are separated. In FIG. 3, since the cut adhesive 40 remains uniformly on the cover glass 40 or the liquid crystal display panel 30, the adhesive 40 can be easily peeled off.

  On the other hand, conventionally, it was cut with a nylon wire used for fishing lines instead of a metal plate. However, in order to prevent the line from being cut, the diameter of the line must be about 0.14 mm. That is, the diameter of the wire is larger than the thickness d of the adhesive 40. Since the wire is made of nylon, the liquid crystal display panel or the cover glass is not damaged, but mechanical damage is caused by stress at the time of peeling. Therefore, the reproduction yield of parts was low. Further, even after the liquid crystal display panel and the cover glass are peeled off, the adhesive does not remain uniformly as shown in FIG.

  On the other hand, in the present invention, since the metal plate 100 is used, the necessary width of the plate can be obtained, so that the mechanical strength can be maintained even if the thickness of the metal plate is reduced. FIG. 4 is a perspective view showing an example of the shape of the metal plate 100 used in FIG. In FIG. 4, the thickness t of the plate is 0.03 mm, the width w is 12.7 mm, and the length l is 200 mm. Since the metal plate 100 is thin as described above, it is necessary to have sufficient strength for cutting the adhesive 40. For the metal plate 100, for example, stainless steel can be used.

  In the present invention, as shown in FIG. 2, the thickness of the metal plate 100 can be made smaller than the thickness of the adhesive 40, so that the position of the metal plate 100 when the adhesive 40 is cut can be accurately controlled. The liquid crystal display panel 30 or the cover glass 50 can be peeled without being damaged, and the reproduction yield of components can be improved.

  The position of the metal plate 100 in the Z-axis direction (vertical direction in the figure) can be adjusted by sandwiching a metal plate having a uniform thickness between the cover glass 50 and the metal plate 100. For example, when the thickness d of the adhesive 40 is 0.1 mm and the thickness of the metal plate 100 is 0.03 mm, the thickness of the metal plate that adjusts the Z-axis direction is 0.03 mm to 0.05 mm. It is preferable to use it.

  FIG. 5A shows an apparatus for peeling a liquid crystal display panel and a cover glass according to the present invention. Hereinafter, it is also simply referred to as a peeling device. FIG. 5B is a plan view showing the relationship between the metal plate 100 and the liquid crystal module 60 in the state of FIG. In FIG. 5A, the z-axis adjustment base 200 is set on the base 1000, and the liquid crystal module mounting base 300 is set thereon. A liquid crystal module 60 in which the cover glass 50 and the liquid crystal display panel 30 are bonded is mounted on the mounting table 300.

  The liquid crystal module 60 is heated to about 80 ° C. by a heating device different from the peeling device, and the adhesive 40 is in a softened state. As will be described later, the liquid crystal module mounting table 300 is provided with a heater so that the temperature of the liquid crystal module can be maintained at about 80 ° C.

  On the other hand, the metal plate 100 for cutting is attached to the metal plate fixing unit 500, and the metal plate fixing unit 500 is attached to the moving handle 700 attached to the peeling portion fixing unit 600. The peeling portion fixing unit 600 has a gate shape, and the metal plate fixing unit 500 to which the metal plate 100 is attached can be moved by moving the column on the guide rail 400.

  The metal plate fixing unit 500 stabilizes the shape of the metal plate 100 and accurately fixes the position of the metal plate 100 by applying tension so as to pull the metal plate 100 to both sides. FIG. 5A shows a state in which the metal plate 100 is inserted into the adhesive 40 from the corner direction when viewed in the plane of the liquid crystal module 60 and the peeling portion fixing unit 600 is moved in the direction of the arrow.

  FIG. 5B is a plan view showing the relationship between the metal plate 100 and the liquid crystal module 60 at this time. In FIG.5 (b), the metal plate 100 has shown the state which cut | disconnected the adhesive material 40 of the lower side of the cover glass 50 to the middle. As the metal plate 100 advances in the adhesive 40, the cutting area of the metal plate 100 increases, and thus the resistance increases. The inside of the dotted line in FIG. 5B shows the region where the adhesive 40 is cut by the metal plate 100.

  In this way, when the resistance for cutting the adhesive 40 increases, the moving handle 700 is rotated. FIG. 6 shows a state where the moving handle 700 is rotated. FIG. 6A shows a state in which the moving handle 700 is rotated in the direction of the arrow. FIG. 6B shows a state where the metal plate 100 is rotated by the moving handle 700. In FIG. 6B, the inside of the dotted line is a region where the adhesive 40 is cut by the metal plate 100.

  In FIG. 6A, the peeling part fixing unit 600 is moved in the direction of the arrow, and the adhesive 40 is further cut by the metal plate 100, so that the contact area of the metal plate 100 with the adhesive 40 is increased again. When the resistance increases, the moving handle 700 is rotated again to cut the adhesive 40 while reducing the contact surface of the metal plate 100 with the adhesive 40.

  FIG. 7 is a schematic cross-sectional view of the peeling device and the liquid crystal module shown in FIGS. 5 and 6. In FIG. 7, a liquid crystal module mounting table 300 is disposed on the z-axis adjusting table 200 of the peeling apparatus, and the liquid crystal module is mounted thereon. The liquid crystal module is arranged on the mounting table with the cover glass 50 facing down. That is, the liquid crystal display panel 30 is disposed with the cover glass 50 on the lower side via the adhesive 40, and the upper polarizing plate 21 of the liquid crystal display panel 30 is bonded to the cover glass 50.

  In the state of FIG. 7, the metal plate 100 and the metal plate fixing unit 500 to which the metal plate 100 is attached are arranged in a part different from the liquid crystal module. The metal plate 100 is set in a state in which a tension is applied in the outer direction indicated by the arrow by the metal plate fixing unit 500, and the formation is stable.

  FIG. 8 is a cross-sectional view showing a state where the adhesive 40 bonding the liquid crystal display panel 30 and the cover glass 50 with the metal plate 100 is cut in a direction parallel to the main surface of the liquid crystal display panel 30. In FIG. 8, the liquid crystal module is accurately controlled in the z-axis direction by the z-axis adjustment base 200. Further, since the metal plate 100 is tensioned outward by the metal plate fixing unit 500, the shape and position are stably maintained. Therefore, the metal plate 100 can be accurately moved within 0.1 mm which is the thickness of the adhesive 40, and the adhesive 40 can be accurately cut.

  FIG. 9 is a detailed perspective view of the z-axis adjustment base 200 and the liquid crystal module mounting base 300. In FIG. 9, the liquid crystal module mounting table 300 is disposed on the z-axis adjustment table 200. The mounting table 300 has a two-layer structure of a liquid crystal module fixing part 301 and a heating part 302. The upper fixing part 301 is formed with a number of holes 303 for sucking the liquid crystal module and fixing its position. ing. A heater insertion hole 304 for inserting a heater is formed in the lower heating unit 302. While the adhesive 40 is being cut by the heater, the temperature of the adhesive is prevented from decreasing and the hardness of the adhesive is prevented from increasing.

  FIG. 10A is a cross-sectional view showing a state in which the liquid crystal module is disposed on the liquid crystal module mounting table 300. 10A, the cover glass 50 of the liquid crystal module is disposed on the mounting table 300, the thermocouple 305 is disposed on the surface where the cover glass 50 and the mounting table 300 contact, and the temperature of the cover glass 50 is measured and bonded. The temperature of the material 40 can be managed.

  FIG. 10B is a plan view showing a position where the temperature of the cover glass is measured by the thermocouple 305. In FIG.10 (b), the thermocouple 305 is installed in nine places. Since a plurality of heaters are arranged on the mounting table 300, the temperature of the adhesive 40 can be managed and controlled for each position by controlling the current of each heater.

  As described above, according to the present invention, since the liquid crystal display panel and the cover glass can be accurately separated, the reproduction yield of each component in the reproduction process can be improved.

  In the above description, the peeling process regarding the liquid crystal display device in which the cover glass is bonded to the liquid crystal display panel has been described. However, the present invention can also be applied to a reproducing process of a liquid crystal display device in which a touch panel is disposed on a liquid crystal display panel and a cover glass is disposed thereon as shown in FIG. In this case, the present invention can be applied to two places of the adhesive 40 between the cover glass 50 and the touch panel 70 and the adhesive 40 between the touch panel 70 and the liquid crystal display panel 30 shown in FIG. Even in such a configuration, it is possible to accurately control the positions of the two adhesives using the z-axis adjusting table.

  Further, the present invention can be applied not only when a liquid crystal display panel is used as a display device but also when an organic EL display panel is used as the display device. In this case, for example, by replacing the liquid crystal display panel in FIG. 1 or FIG. 11 with an organic EL display panel, the techniques described in the above embodiments can be applied as they are.

  DESCRIPTION OF SYMBOLS 10 ... TFT substrate, 11 ... Lower polarizing plate, 20 ... Opposite substrate, 21 ... Upper polarizing plate, 30 ... Liquid crystal display panel, 40 ... Adhesive material, 50 ... Cover glass, 60 ... Liquid crystal module, 70 ... Touch panel, 80 ... Back Light: 100 ... Metal plate, 200 ... z axis adjusting table, 300 ... mounting table, 301 ... liquid crystal module fixing part, 302 ... heating part, 303 ... adsorption hole, 304 ... heater insertion hole, 305 ... thermocouple, 400 ... guide Rail, 500 ... Metal plate fixing unit, 600 ... Peeling part fixing unit, 700 ... Moving handle

Claims (9)

A peeling device that separates the display module in which the cover glass is bonded to the display panel with an adhesive into the cover glass and the display panel,
A z-axis adjustment table for controlling the position in the z-axis direction is disposed under the mounting table for mounting the display module,
A fixing unit for fixing a metal plate for cutting the adhesive in a direction parallel to the main surface of the liquid crystal display panel;
The thickness of the metal plate is smaller than the thickness of the adhesive,
The metal plate is in a state of being tensioned by the fixing unit,
The fixing unit is capable of moving the metal plate in a direction parallel to the main surface of the liquid crystal display panel and cutting the adhesive in a direction parallel to the main surface of the liquid crystal display panel. Peeling device.   The display module peeling apparatus according to claim 1, wherein the mounting table includes a heater for heating the display module.   The display module peeling apparatus according to claim 1, wherein the metal plate is rotatable in a direction parallel to a main surface of the liquid crystal display panel by the fixing unit.   2. The display module peeling apparatus according to claim 1, wherein the metal plate is stainless steel.   The display module includes a touch panel between the display panel and the cover glass, and the peeling device includes an adhesive that bonds the display panel and the touch panel, or an adhesive that bonds the touch panel and the cover glass. The peeling apparatus according to claim 1, wherein the peeling apparatus cuts in a main surface direction of the display panel. A peeling method for separating a display module in which a cover glass is bonded to a display panel with an adhesive into the cover glass and the display panel,
Placing the display module on a heated mounting table;
Set the position of the mounting table by the z-axis adjustment table so that the tensioned metal plate can cut the adhesive material in the main surface direction of the display panel,
A method for peeling a cover glass and a display module, wherein the adhesive plate is cut in a main surface direction of the display panel by moving the metal plate in a direction parallel to the main surface direction of the display panel.   After the adhesive material is cut by a predetermined amount by the metal plate, the metal plate is rotated by a predetermined angle, and then the metal plate is further moved in a direction parallel to the main surface direction of the display panel. The method of peeling a cover glass and a display panel according to claim 6, wherein the material is cut in a thickness direction.   The cover module according to claim 6, wherein the display module is heated by a heating device different from the device having the mounting table before being mounted on the mounting table. Peeling method. A cover glass and a touch panel are bonded by a first adhesive, and the display module in which the touch panel and the display panel are bonded by a second adhesive is separated into the cover glass, the touch panel, and the display panel. A peeling method,
Placing the display module on a heated mounting table;
The position of the mounting table is set by the z-axis adjustment table so that the tensioned metal plate can be cut in the main surface direction of the display panel of the first adhesive material or the second adhesive material,
The metal plate is moved in a direction parallel to the main surface direction of the display panel to cut the first adhesive material or the second adhesive material in the main surface direction of the display panel. A method for peeling a cover glass, the touch panel, and the liquid crystal display panel.

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