JP2007206559A - Removal method of film for liquid crystal display panel - Google Patents

Abstract

A polarizing film can be easily peeled off from the surface of a substrate even if the substrate is easily damaged.
A polarizing film 12 and an adhesive 14 of a liquid crystal display panel 10 are heated in a range of 70 ° C. to 100 ° C. in an electromagnetic wave generator 22, and then the polarizing film 12 and the adhesive 14 are removed by a film removing device 32. What is removed.
[Selection] Figure 3

Description

  The present invention relates to a method for removing a film for a liquid crystal display panel.

  In an electronic device including a display unit, a display unit configured with a liquid crystal display (LCD) panel is widely used. Such a liquid crystal display panel includes, for example, a liquid crystal layer formed between opposing substrates made of glass or plastic, and one of the substrates as shown in Patent Document 1 and Patent Document 2. Or it is comprised including the polarizing film adhere | attached on both as a main element.

  In the manufacturing process of such a liquid crystal display panel, when the polarizing film is adhered to the surface of the substrate, undesired bubbles and foreign substances are formed between the adhesive applied to the surface of the substrate and the polarizing film. There is a case. As a method for preventing the formation of such bubbles, for example, as shown in Patent Document 3, when the polarizing film is adhered to the surface of the substrate, the polarizing film is adhered to the substrate while being pressed against the substrate. Thereafter, heat is applied to the polarizing film for a relatively long period of time.

JP 2000-248243 A JP 2001-27753 A Japanese Patent Laid-Open No. 2001-27879

  Applying heat to the polarizing film for a relatively long period of time as in the above-described method is not a good solution from the viewpoint of production efficiency, and even if the above measures are taken, the liquid crystal to be mass-produced Of the display panels, it cannot be said that no liquid crystal display panel is formed between the adhesive in which bubbles or foreign substances are applied to the surface of the substrate and the polarizing film.

  In such a case, it is also conceivable that the polarizing film is once peeled off from the substrate, and a new polarizing film is attached to the substrate again.

  However, in the case of a glass substrate, it is not easy to peel the polarizing film from the surface of the substrate because the substrate is easily damaged.

  In view of the above problems, the present invention is a method for removing a film for a liquid crystal display panel, which can easily peel off a polarizing film from the surface of a substrate even if the substrate is easily damaged. It aims at providing the removal method of a film.

  In order to achieve the above-mentioned object, a method for removing a film for a liquid crystal display panel according to the present invention includes a polarizing film and a polarizing film and an adhesive layer of a liquid crystal display panel, each having a polarizing film and a substrate stacked on the polarizing film via an adhesive layer. On the other hand, it includes a step of irradiating and heating an electromagnetic wave in a microwave band so as to soften the polarizing film and the adhesive layer, and a step of removing the heated polarizing film and the adhesive layer from the substrate of the liquid crystal display panel.

  As is clear from the above description, according to the method for removing a film for a liquid crystal display panel according to the present invention, the microwave band is softened so as to soften the polarizing film and the adhesive layer with respect to the polarizing film and the adhesive layer of the liquid crystal display panel. Since the polarizing film and the adhesive layer are softened because the electromagnetic wave is irradiated and heated, the polarizing film can be easily peeled off from the surface of the substrate even if the substrate is easily damaged.

  FIG. 2 schematically shows a part of a cross-sectional structure of a liquid crystal display panel to which an example of a method for removing a film for a liquid crystal display panel according to the present invention is applied.

  In FIG. 2, the liquid crystal display panel 10 includes a relatively thin glass substrates 16 and 20 that are arranged to face each other at a predetermined interval, a liquid crystal layer 18 that is arranged between the glass substrate 16 and the glass substrate 20, The polarizing plate 12 is bonded to one surface of the glass substrate 16 via an adhesive 14 as a main element.

  The liquid crystal layer 18 includes, for example, a color filter formed on one surface of the glass substrate 20, a pair of transparent electrodes formed on the color filter, an alignment film provided between the pair of transparent electrodes, and And liquid crystal.

  The polarizing film 12 irradiated with a backlight (not shown) is formed in a thin film shape from, for example, a polyvinyl alcohol-based material. The adhesive 14 is an acrylic adhesive, for example, an adhesive containing cellulose triacetate having a hydroxyl group.

  The liquid crystal display panel 10 is not limited to the above-described example, and as shown by a two-dot chain line in FIG. 2, the polarizing film 12 is an adhesive similar to the adhesive 14 on the other surface of the glass substrate 20. It may have been well bonded without air bubbles.

  In an example of the method for removing a film for a liquid crystal display panel according to the present invention, for example, an undesired polarizing film 12 in which bubbles or foreign matters are found in the middle of production is removed from the glass substrate 16 of the liquid crystal display panel 10. First, a plurality of target liquid crystal display panels 10 are arranged in the electromagnetic wave generator 22.

The electromagnetic wave generator 22 generates an electromagnetic wave in a high frequency band such as a microwave oven. As shown in FIG. 1, the electromagnetic wave generator 22 has a panel housing chamber 28 a that houses and heats the liquid crystal display panel 10 inside the outer portion 28. The panel housing chamber 28 a has a metal reflecting wall that reflects the electromagnetic waves (microwaves) from the electromagnetic wave generator 26 and irradiates the reflected microwaves toward the liquid crystal display panel 10 on the entire inner peripheral portion. Yes. The panel housing chamber 28a includes a panel shelf 24ai (i = 1 to n, n is a positive integer) on which each liquid crystal display panel 10 is placed. The panel shelves 24ai are arranged in parallel with each other at a predetermined interval. On the side of the liquid crystal display panel 10, an electromagnetic wave generator 26 including a magtron is provided. The magtron is supposed to generate microwaves in the range of vibrating water molecules, for example, 2.45 × 10 ⁹ (Hz) band.

  Next, the electromagnetic wave generator 26 is activated, and the electromagnetic waves are applied to the polarizing films 12 of the plurality of liquid crystal display panels 10 for a predetermined period. Thereby, since the polarizing film 12 and the adhesive agent 14 of the liquid crystal display panel 10 each contain a hydroxyl group as described above, the surface temperature thereof is heated and softened in the range of 70 ° C. to 100 ° C.

  Subsequently, each liquid crystal display panel 10 heated from the panel housing chamber 28a is taken out and placed on the support surface 30S of the support base 30 as shown in FIG. One opening end of suction passages 30a, 30b, 30c and 30d formed inside is opened on the support surface 30S of the support base 30. The other open ends of the suction passages 30a, 30b, 30c, and 30d are connected to, for example, a suction unit that is connected to a vacuum pump (not shown). As a result, when the vacuum pump is activated, the liquid crystal display panel 10 is held at a predetermined position on the support surface 30S of the support base 30 by the suction force. At that time, the liquid crystal display panel 10 is placed so that the glass substrate 20 is in contact with the support surface 30S.

  Subsequently, as shown in FIG. 3, a film removing device 32 having a sharp blade portion 32 </ b> E is disposed on one side of the support base 30. The blade portion 32E of the film removing device 32 is supported so as to be reciprocally movable at a predetermined moving speed relative to the support surface 30S.

  At that time, at the initial position, the tip of the blade part 32E of the film removing device 32 is made to coincide with one end part in the boundary part between the adhesive 14 and the glass substrate 16 as shown by a two-dot chain line in FIG. Placed in.

  And the blade part 32E is moved from the one edge part side of the polarizing film 12 and the adhesive agent 14 to the other edge part along the direction which the arrow shows in FIG. Thereby, along with the movement of the blade portion 32E in the direction indicated by the arrow, the surface of the glass substrate 16 is gradually increased so that the polarizing film 12 ′ and the adhesive 14 ′ in the liquid crystal display panel 10 are indicated by a two-dot chain line in FIG. It will be easily scraped off.

  In the above-described example, the heated polarizing film 12 ′ and the adhesive 14 ′ are removed from the surface of the glass substrate 16 using the film removing device 32. However, the present invention is not limited to this example. As shown in FIG. 4, an adhesive sheet 34 having an adhesive layer 34a on one surface may be used. In FIG. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and redundant description thereof is omitted.

  In FIG. 4, first, each heated liquid crystal display panel 10 is taken out from the panel housing chamber 28 a and placed on the support surface 30 </ b> S of the support base 30 in the same manner as in the above example. At that time, the liquid crystal display panel 10 is placed so that the glass substrate 20 is in contact with the support surface 30S.

Next, the pressure-sensitive adhesive layer 34a is brought into contact with the surface of the polarizing film 12 and pressed with a predetermined pressure, and then the adhesive sheet 34 is pulled up as shown by a two-dot chain line in FIG.
Thereby, the polarizing film 12 ′ and the adhesive 14 ′ are easily peeled off from the surface of the glass substrate 16 by the adhesive force of the adhesive layer 34 a.

  Therefore, even if the glass substrate 16 is easily damaged, the polarizing film 12 and the adhesive 14 are easily peeled off from the surface without damaging the glass substrate 16.

It is a block diagram which shows roughly the structure of the electromagnetic wave generator used for an example of the removal method of the film for liquid crystal display panels which concerns on this invention. It is sectional drawing which shows typically the cross-section of the liquid crystal display panel to which an example of the removal method of the film for liquid crystal display panels which concerns on this invention is applied. It is a figure used for description of the removal process of the film which used the film removal apparatus in an example of the removal method of the film for liquid crystal display panels which concerns on this invention. It is a figure used for description of the removal process of the film using an adhesive sheet in an example of the removal method of the film for liquid crystal display panels which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel 12 Polarizing film 14 Adhesive 16 Glass substrate 22 Electromagnetic wave generator 32 Film removal apparatus 34 Adhesive sheet

Claims (4)

An electromagnetic wave in a microwave band is irradiated to the polarizing film and the adhesive layer of a liquid crystal display panel having a polarizing film and a substrate stacked on the polarizing film via an adhesive layer so as to soften the polarizing film and the adhesive layer. Heating, and
Removing the heated polarizing film and adhesive layer from the substrate of the liquid crystal display panel;
A method for removing a film for a liquid crystal display panel, comprising:   The method for removing a film for a liquid crystal display panel according to claim 1, wherein the polarizing film and the adhesive layer are made of a substance containing a hydroxyl group.   The method for removing a film for a liquid crystal display panel according to claim 1, wherein the heated polarizing film and the adhesive layer are scraped off from the substrate by a film removing device. The method for removing a film for a liquid crystal display panel according to claim 1, wherein the heated polarizing film and the adhesive layer are peeled off from the substrate by an adhesive sheet.

Images