JPH09325335A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the liquid crystal display device which is stabilized in quality and its manufacture by evading the sticking of foreign matter and dust on the adhesive layer of a polarizing plate owing to its peeling in a labeler machining process wherein the polarizing plate is cut up to the adhesive layer and remounted on a separator. SOLUTION: Through this labeler machining, the polarizing plate 7 cut to panel size and a carrier tape 8 are reheld and remounted on the separator 10 at a specific interval. At this time, a both-sided adhesive tape 11 as a connecting means is already adhered so that both the ends of the polarizing plate 7 and carrier tape 8 can be connected, thereby remounting the polarizing plate 7 plus carrier tape 8 on the separator 10 with this both-sided adhesive tape 11. Consequently, the adhesive layer 7e of the polarizing plate 7 is never peeled and none of foreign matter, dust, etc., sticks on the adhesive layer 7e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for manufacturing the same, and more specifically, it improves the quality of a liquid crystal display by improving the step of sticking a polarizing plate to a liquid crystal cell. The present invention relates to a device and a manufacturing method thereof.

[0002]

2. Description of the Related Art A liquid crystal display device is characterized by a flat structure and low power consumption, and electronic equipment with a liquid crystal display device represented by a liquid crystal projector and a video camera with a liquid crystal monitor,
It is also being put to practical use and becoming widespread in televisions and the like. FIG. 2 is a diagram showing a basic configuration of a liquid crystal display device according to the present invention. The liquid crystal display device 1 in the figure is generally constituted by a counter substrate 2 and a driving substrate 3.

[0003] R, G,
A color filter B (in the case of a color liquid crystal device), a transparent electrode 4A, and the like are formed. Scan lines and signal lines that are insulated from each other are formed on the drive substrate 3, and thin film transistors (not shown) for driving each pixel are formed at the intersections thereof, and a transparent electrode 4B and the like are formed. I have.
A liquid crystal display device having such a structure is called an active matrix type.

The counter substrate 2 and the drive substrate 3 are manufactured in their respective manufacturing processes, and then are arranged to face each other with a predetermined gap therebetween, and a spacer (not shown) is provided.
Are sandwiched by a sealing material 5 and the liquid crystal 6 is injected from an injection hole (not shown). This state is defined as a "liquid crystal cell". After that, this liquid crystal cell is moved to a polarizing plate attaching step, and the polarizing plate 7A,
By attaching 7B, the liquid crystal display device 1 having the above configuration
Is completed.

The construction of a polarizing plate used in the conventional polarizing plate attaching process will be described by exemplifying the manufacturing process and sectional structure of the polarizing plate used in the polarizing plate attaching process in FIG.

The polarizing plate used in the conventional polarizing plate adhering step is obtained by stretching PVA (polyvinyl alcohol) 3 to 5 times in the stretching step shown in FIG. 3, and attaching an acetate film or the like in the film processing step. Make a polarizing substrate. Then, in a bonding step, the polarizing substrate is bonded to the substrate TAC (triacetyl cellulose) that protects it from both sides. Subsequently, an adhesive treatment is performed in the adhesive coating process to facilitate the attachment to the liquid crystal cell.

The polarizing plate processed in this way is cut into strips in a cutting process, and the polarizing plate cut into strips is further cut into each panel size by a die cutting machine. The polarizing plate cut into panel size is
It is transferred to a labeler processing step (details will be described later), and is peeled from the carrier tape (reference numeral 8 in FIG. 7B) by the labeler processing step and placed on another separator tape. The purpose of this is to facilitate the handling of the polarizing plate in the step of attaching the polarizing plate, which is performed automatically or manually, by rearranging the polarizing plate with a certain space.

That is, the polarizing plate 7 as shown in FIG.
The cross-sectional structure of is a polarizer 7d whose both sides are held by the protective film 7a, the hard coat layer 7b, and the TAC layer 7c described above.
(Adsorbed and dispersed iodine or dye and stretched) and an adhesive layer 7e for giving the polarizing plate 7 an adhesive function. Such a polarizing plate 7 is configured by being bonded to a carrier tape 8 (release film).

Next, details of the conventional labeling process will be described with reference to FIG.

The conventional labeler processing step is divided into panel sizes by the cutting step in FIG. 3 (a), and the polarizing plate 7 is cut by the half-cut method C up to the adhesive layer 7e shown in FIG. 3 (b). Is carried out and the separator 9 fixed by a predetermined means is replaced with a predetermined interval. The liquid crystal display device and the polarizing plate which are the objects of the present invention are not limited to this structure and manufacturing method, and are merely examples.

However, in such a conventional labeling method, the adhesive layer 7e of the polarizing plate 7 is exposed when the polarizing plate 7 is cut up to the adhesive layer 7e and placed on the separator 9, so that the adhesive layer 7e is exposed. Foreign matter and dust E (Fig. 4
(Refer to (b)) is easy to adhere. If the dust E adheres to the adhesive layer 7e of the polarizing plate 7 and is incorporated in a liquid crystal display device, there is a problem that the quality of the liquid crystal display device becomes poor. Further, this has a problem that the production efficiency of the liquid crystal display device is lowered and the manufacturing cost of the liquid crystal display device is increased.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the problem is to cut a polarizing plate up to an adhesive layer and replace it on a separator tape in a labeling process of a liquid crystal display device. At the time, it is to provide a liquid crystal display device and a method for manufacturing the liquid crystal display device, in which foreign matter and dust are prevented from adhering to the adhesive layer due to the adhesive layer of the polarizing plate being exposed, and the quality of the liquid crystal display device is stabilized. .

[0013]

In order to solve the above-mentioned problems of the present invention, the following means have been taken. That is, in a method for manufacturing a liquid crystal display device, which includes a polarizing plate sticking step of sticking a polarizing plate having a sticking function by sticking a polarizing plate to a carrier tape via an adhesive layer, The step is to divide the polarizing plate into each panel size and to cut the polarizing plate including the carrier tape via the adhesive layer of the polarizing plate and to connect both ends of the polarizing plate cut by the cutting process ( A labeler processing step of replacing a separator provided with a double-sided tape or the like) at a predetermined interval.

Further, by cutting the polarizing plate by the cutting method of this cutting step, the adhesive layer of the polarizing plate is prevented from being exposed in the labeling process. As a result, it is possible to prevent foreign matter and dust from adhering to the adhesive layer in the labeling process, and improve the quality of the liquid crystal display device after being assembled. Furthermore, since the adhesive layer of the polarizing plate is not exposed,
The end face of the polarizing plate will not be bent or pinched. Thereby, the production efficiency of the liquid crystal display device can be improved.

The liquid crystal display device of the present invention is characterized by being manufactured by a method for manufacturing a liquid crystal display device having such a polarizing plate adhering step.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

The liquid crystal display device of the present invention and the manufacturing method thereof will be described in detail with reference to FIG. FIG. 1 is a diagram showing a labeling process in a liquid crystal display device of the present invention,
(A) is a top view which shows a labeler process, (b) is a side sectional drawing which shows a labeler process. It should be noted that parts common to those described in the related art are designated by the same reference numerals.

The labeling process of the present invention is carried out by referring to FIG.
As shown in FIG. 3B, the adhesive layer 7 is divided into each panel size by the cutting step of FIG.
It is carried out by bringing the polarizing plate 7 cut by the whole-surface cutting method D including the carrier tape 8 via e and replacing it on the separator 10 of the present invention.

That is, the labeling process of the present invention is
As shown in FIG. 1, a polarizing plate 7 + carrier tape 8 cut into a panel size by an automatic machine such as a die cutting machine.
Then, the separator 10 of the present invention fixed by a predetermined means is replaced with a predetermined interval. At this time,
To the separator 10 of the present invention, a double-sided tape 11 as a connecting means is bonded in advance so that both ends of the polarizing plate 7 + carrier tape 8 can be connected, and the double-sided tape 11 connects the polarizing plate 7 + carrier tape 8 to the present invention. Separator 1
It can be changed to 0.

After that, the replaced polarizing plate 7 + carrier tape 8 is transferred to a polarizing plate attaching step, and is attached to both sides of the liquid crystal cell by an automatic machine or manually to complete the liquid crystal display device of the present invention. .

As described above, according to the labeler processing step of the present invention, the polarizing plate 7 is cut including the carrier tape 8 via the adhesive layer 7e, and is cut and placed on the separator 10 of the present invention. The adhesive layer 7e of No. 7 is not exposed, and no foreign matter, dust or the like is attached to the adhesive layer 7e. Moreover, since the adhesive layer 7e of the polarizing plate 7 is not exposed, the end face of the polarizing plate 7 is not bent or pinched. As a result, when the liquid crystal display device is assembled, the quality is not deteriorated, and the production efficiency of the liquid crystal display device can be improved.

The present invention is not limited to the above embodiment,
Various embodiments can be adopted. For example, although the labeler processing method for the liquid crystal display device has been illustrated as an example in the above-described embodiment, the present invention is not limited to this and can be applied to any material to which the labeler processing is applied. Further, it goes without saying that the present invention is not limited to the above-described embodiment, but can be developed in various forms.

[0023]

As described above, according to the liquid crystal display device and the method for manufacturing the same of the present invention, in the cutting step, the polarizing plate is cut by the whole surface cutting method including the carrier tape through the adhesive layer, and Since the adhesive layer of the polarizing plate is not exposed, foreign matter and dust do not adhere to the adhesive layer of the polarizing plate because the adhesive layer of the polarizing plate is not exposed.

Further, since the adhesive layer of the polarizing plate is not exposed, the end face of the polarizing plate is not bent or pinched. Therefore, when assembled as a liquid crystal display device, the quality is not deteriorated, the process margin in the polarizing plate bonding step can be expanded, and the production efficiency of the liquid crystal display device is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a labeling process in a liquid crystal display device of the present invention, (a) is a top view showing the labeling process, and (b) is a side sectional view showing the labeling process.

FIG. 2 is a schematic cross-sectional view showing a basic configuration of a liquid crystal display device according to the present invention.

3A and 3B are diagrams showing a polarizing plate used in a conventional polarizing plate attaching step, FIG. 3A is a process flow diagram showing a manufacturing process of the polarizing plate, and FIG. 3B is a structure of an adhesive function polarizing plate. FIG.

4A and 4B are diagrams showing a labeling process in a conventional liquid crystal display device, FIG. 4A is a top view showing the labeling process, and FIG. 4B is a side sectional view showing the labeling process.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Counter substrate, 3 ... Drive substrate, 4
A, 4B: transparent electrode, 5: sealing material, 6: liquid crystal, 7, 7
A, 7B ... Polarizing plate, 8 ... Carrier tape, 9 ... Separator, 10 ... Separator of the present invention, 11 ... Double-sided tape

Claims (3)

[Claims] 1. A method of manufacturing a liquid crystal display device, comprising a polarizing plate bonding step of bonding a polarizing plate having a pressure-sensitive adhesive function, in which a polarizing plate is bonded to a carrier tape via an adhesive layer, to a liquid crystal cell. The polarizing plate adhering step includes a cutting step of dividing the polarizing plate into each panel size and cutting by including the carrier tape through the adhesive layer of the polarizing plate, and both sides of the polarizing plate cut by the cutting step. A method for manufacturing a liquid crystal display device, comprising: a separator provided with a connecting means for connecting ends; 2. The liquid crystal display device according to claim 1, wherein the adhesive layer of the polarizing plate is prevented from being exposed in the labeling process by cutting the polarizing plate in the cutting process. Production method. 3. A liquid crystal display device manufactured by using the method for manufacturing a liquid crystal display device according to claim 1.