JPH09197394A - Device for peeling polarizing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the impression of unnecessary force to a liquid crystal panel at the time of peeling work of a polarizing plate and to evade the generation of a defective gap in a liquid crystal panel. SOLUTION: The peeling device is provided with a winding roller 4 for winding up a polarizing plate 1 by rotating while supporting the edge of the plate 1, and a pair of press rollers 3a, 3b arranged on both the sides of the roller 4 in parallel and having a diameter larger than that of the roller 4. While abutting the rollers 3a, 3b upon a liquid crystal panel 2, the polarizing plate 1 stuck to the panel 2 is wound up by the roller 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing plate peeling device, and more particularly, to peeling and peeling a polarizing plate for re-bonding the polarizing plate when there is a problem with the laminated polarizing plate in the production of a liquid crystal panel. The present invention relates to a polarizing plate peeling device for passing to a reproducing process.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as flat type display devices for displaying various images or characters.

This liquid crystal display device has a liquid crystal panel in which a liquid crystal layer is sandwiched between at least two transparent electrode substrates, and a liquid crystal display module in which a backlight for illumination is incorporated on the lower surface of the liquid crystal panel, which is required for driving. It is configured by integrating a printed circuit board on which circuits and the like are mounted.

Polarizing plates (sheet-shaped polarizing members) for applying a predetermined polarization to the illumination light from the backup roll and for selecting the polarization plane of the emitted light are attached to the front and back surfaces of the liquid crystal panel.

FIG. 8 is a cross-sectional view for explaining the schematic structure of a liquid crystal panel, in which a liquid crystal layer 2c is enclosed between two glass substrates 2a and 2b so that the distance between both glass substrates, that is, the cell gap is constant. A liquid crystal panel 2 is formed by sealing with a sealing material 2e via a bead 2d for the purpose, and a polarizing plate 1 is attached to both surfaces of the liquid crystal panel.

[0006] In the inspection process after laminating the polarizing plate to the liquid crystal panel, scratches are found on the polarizing plate,
When wrinkles or dust is found, the polarizing plate is peeled off, and the film is passed to a reproducing process for bonding again.

FIG. 9 is an explanatory view of a conventional polarizing plate peeling work, in which a corner 1a of a polarizing plate 1 attached to a liquid crystal panel 2 is slightly moved from the surface of the liquid crystal panel by using a cutter knife or the like (for example, 20 to 30 mm), and the peeled corner 1a is picked by hand, and the polarizing plate 1 is peeled off while pressing the liquid crystal panel surface by hand.

[0008]

When the polarizing plate is peeled off by holding the polarizing plate with one hand and pressing the liquid crystal panel with the other hand as in the conventional case described above, the polarizing plate has a strong adhesive force to the liquid crystal panel. , The nonuniform pressure is applied to the liquid crystal panel, and the cell gap between the glass substrate to which the polarizing plate for peeling is attached and the other glass substrate is expanded or reduced to secure the cell gap. There is a problem that the distribution of the beads changes, causing a cell gap failure of the liquid crystal panel after peeling the polarizing plate.

It is an object of the present invention to solve the above-mentioned problems of the prior art and to prevent unnecessary defects from being applied to the liquid crystal panel at the time of peeling the polarizing plate to avoid gap defects in the liquid crystal panel. It is to provide a plate peeling device.

[0010]

Means for achieving the above object will be described with reference to the reference numerals of the embodiments.

That is, in the first aspect of the present invention, the take-up roller 4 for taking up the polarizing plate by supporting and rotating the edge of the polarizing plate and the both sides of the take-up roller are parallel. And a pair of pressing rollers 3a, 3b having a diameter larger than the shaft diameter of the winding roller.
The polarizing plate 1 attached to the liquid crystal panel while the pressing rollers 3a and 3b are in contact with the liquid crystal panel 2 is taken up by the take-up roller 4. The second invention described in claim 2 is characterized in that the winding roller 4 in the first invention is provided with a locking portion for holding an edge of the polarizing plate 1.

Further, the third invention according to claim 3 is
The pressing roller 3 according to the first invention or the second invention.
At least the peripheral surfaces of a and 3b are made of a soft material.

The present invention is not limited to the above configuration. For example, one or two bars having a circular cross section may be used instead of the take-up roller, and the locking of the edge of the polarizing plate may be sandwiched between the two bars. it can.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 1 shows a polarizing plate peeling device 1 according to the present invention.
1 is a perspective view for explaining an embodiment, in which 1 is a polarizing plate, 2 is a liquid crystal panel, 3a and 3b are pressing rollers, 4 is a take-up roller, 5 is a motor, 5a, 5b and 5c are brackets, 9 is a mount, 10 is a frame. The polarizing plate peeling device of the present embodiment includes a motor 5 attached to a frame 5a fixed to a pedestal 9, a winding roller 4 fixed to a rotation shaft of the motor 5, and a pair supported by a bracket 5b and a frame 5c. It is composed of pressing rollers 3a and 3b.

Although not shown, a panel mounting table for mounting the liquid crystal panel 2 movably in the direction of arrow A is also installed if necessary.

The pair of pressing rollers 3a and 3b are arranged in parallel with the take-up roller 4 with a certain distance, the diameter of which is larger than the diameter of the take-up roller 4, and the diameter of the take-up roller is from the liquid crystal panel 2. The outer circumference of the polarizing plate 1 is set so as not to press the surface of the liquid crystal panel 2 during the winding process.

The distance between the pressing rollers 3a and 3b and the take-up roller 4 allows the take-up roller 4 to engage the peeled edge of the polarizing plate 1 attached to the liquid crystal panel 2. The force acting on the liquid crystal panel 2 during the peeling work of the polarizing plate by the winding roller 4 is set to a minimum so that the cell gap between the two glass substrates of the liquid crystal panel is not affected.

The pressing rollers 3a, 3b are made of a soft material such as rubber on their outer circumferences, and are rotated in accordance with the movement of the liquid crystal panel 2 caused by the peeling of the polarizing plate 1, and the liquid crystal. The surface of the panel 2 is not damaged, and the liquid crystal panel 2 is not subjected to excessive stress.

FIG. 2 is an illustration of an example of the work for peeling the polarizing plate from the liquid crystal panel.

When the polarizing plate 1 attached to the liquid crystal panel 2 is peeled off, first, a part of the edge of the polarizing plate 1 is peeled off the liquid crystal panel 2 by an appropriate tool, for example, 20 to 30 mm, and the take-up roller 4 is removed. It is fixed with double-sided adhesive tape 6. This double-sided pressure-sensitive adhesive tape 6 may be attached to both ends, or may be provided at only one place in the center. By rotating the motor 5 shown in FIG. 1 in this state, the polarizing plate 1 is peeled off from the liquid crystal panel 2 and wound around the winding roller 4, and the liquid crystal panel 2 is conveyed in the direction of arrow A. In the figure, the sizes and intervals of the take-up roller 4 and the pressing rollers 3a and 3b are shown enlarged for easy understanding.

After the peeling work is completed, the peeled polarizing plate 1 is pulled by holding the rear end thereof by hand or by reversing the motor while holding the rear end by hand.

As a result, the polarizing plate 1 can be peeled off without applying unnecessary pressure to the liquid crystal panel 2.

FIG. 3 is an explanatory view of another example of the work for peeling the polarizing plate from the liquid crystal panel.

In the figure, the corners of the polarizing plate 1 attached to the liquid crystal panel 2 are peeled off with an appropriate tool and fixed to the winding roller 4 with the double-sided adhesive tape 6.

In this state, by rotating the motor shown in FIG. 1, the polarizing plate 1 is peeled from the liquid crystal panel 2 and taken up by the take-up roller 4, and the liquid crystal panel 2 is conveyed in the direction of arrow A. Note that, similarly to FIG. 2, the sizes and intervals of the take-up roller 4 and the pressing rollers 3a and 3b are shown enlarged for easy understanding.

Similarly, after the peeling work is completed,
The peeled polarizing plate 1 is pulled by holding the rear end thereof by hand or by reversing the motor while holding the rear end by hand.

As a result, the polarizing plate 1 can be peeled off without applying unnecessary pressure to the liquid crystal panel 2.

FIG. 4 is an explanatory view of the peeling operation of the polarizing plate by the rotation of each roller of the polarizing plate peeling device according to the present invention. The take-up roller 4 and the pair of pressing rollers 3a and 3b rotate in the same direction. The polarizing plate 1 is peeled off from the liquid crystal panel 2.

FIG. 5 is an explanatory diagram of another example of the peeling operation of the polarizing plate by rotating each roller of the polarizing plate peeling device according to the present invention. The winding roller 4 and a pair of pressing rollers 3a,
3b rotates in the opposite direction and peels the polarizing plate 1 from the liquid crystal panel 2.

FIG. 6 is a sectional view for explaining an example of a polarizing plate locking portion of the winding roller, and 7 is a plate-like member for sandwiching and fixing the polarizing plate 1 on the surface of the winding roller 4. The winding roller 4 is attached in the longitudinal direction.

The polarizing plate 1 is peeled off a part of its edge from the liquid crystal panel, sandwiched between the take-up roller 4 and the plate-like member 7 to be fixed, and the motor is rotated in this state to make most of the polarizing plate 1. Peel off the polarizing plate.

FIG. 7 is a cross-sectional view for explaining another example of the polarizing plate locking portion of the take-up roller, in which 8 is a part of the take-up roller or a groove formed in the longitudinal direction thereof. A part of the edge of the polarizing plate 1 is peeled off from the liquid crystal panel and inserted into the groove to be fixed, and the motor is rotated in this state to peel off most of the polarizing plate.

The structure of the locking portion for fixing the edge of the polarizing plate 1 to the take-up roller 4 is not limited to the above-mentioned examples, and other suitable fixing means can be used.

With the above structure, the polarizing plate can be easily peeled off without applying unnecessary pressure to the liquid crystal panel, and the efficiency of the reclaiming work is remarkably improved.

[0036]

As described above, according to the present invention,
It is possible to provide a polarizing plate peeling device that can prevent unnecessary force from being applied to the liquid crystal panel during the peeling work of the polarizing plate and can avoid a gap defect in the liquid crystal panel.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating one embodiment of a polarizing plate peeling device according to the present invention.

FIG. 2 is an explanatory diagram of an example of an operation for peeling a polarizing plate from a liquid crystal panel.

FIG. 3 is an explanatory diagram of another example of work for peeling a polarizing plate from a liquid crystal panel.

FIG. 4 is an explanatory diagram of a peeling operation of the polarizing plate by rotating each roller of the polarizing plate peeling device according to the present invention.

FIG. 5 is an explanatory view of another example of the peeling operation of the polarizing plate by rotating each roller of the polarizing plate peeling device according to the present invention.

FIG. 6 is a cross-sectional view illustrating an example of a polarizing plate locking portion of a winding roller.

FIG. 7 is a cross-sectional view illustrating another example of a polarizing plate locking portion of a winding roller.

FIG. 8 is a cross-sectional view illustrating a schematic structure of a liquid crystal panel.

FIG. 9 is an explanatory diagram of a conventional polarizing plate peeling operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polarizing plate 2 Liquid crystal panel 3a, 3b Holding roller 4 Winding roller 5 Motor 5a, 5b, 5c Bracket 6 Double-sided adhesive tape 7 Plate-shaped member 8 Groove 9 Frame 10 Frame.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kikuo Takeuchi 3350 Hayano, Mobara-shi, Chiba Hitachi Electric Devices Co., Ltd.

Claims (3)

[Claims] 1. A take-up roller for taking up the polarizing plate by supporting and rotating an edge of the polarizing plate, and a winding roller arranged parallel to both sides of the taking-up roller and having a shaft diameter larger than that of the taking-up roller. And a pair of pressing rollers having a diameter, the polarizing plate attached to the liquid crystal panel while the pressing roller is in contact with the liquid crystal panel is wound by the winding roller. Peeling device. 2. The polarizing plate peeling device according to claim 1, wherein the winding roller is provided with a locking portion for holding an edge of the polarizing plate. 3. The polarizing plate peeling device according to claim 1, wherein at least the peripheral surface of the pressing roller is made of a soft material.