JPH06100742B2 - Method of sticking polarizing plate for liquid crystal display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of attaching a polarizing plate to a liquid crystal cell, and particularly to a small liquid crystal cell for a camera, a thermometer, a watch, etc. Regarding the method of pasting at the same time.

[Conventional technology]

In order to attach the polarizing plate to the liquid crystal cell without entraining air bubbles between the liquid crystal cell and the polarizing plate having an adhesive surface, it is preferable to sequentially attach the polarizing plate from one end of the liquid crystal cell to the other end.

Conventionally, as such a method, there is known a method using a rubber roller as shown in JP-A-54-133150 and JP-B-60-7768. The one disclosed in Japanese Patent Laid-Open No. 54-133150 is such that the polarizing plates held in the carrier one by one are pushed by the polarizing film pushing pieces and temporarily bonded to the liquid crystal cell.
A rubber roller is used for pressure bonding. Japanese Examined Japanese Patent Sho 60-776
The one shown in Japanese Patent No. 8 is one in which a polarizing plate is supported by a belt-shaped carrier tape, the carrier tape is brought into contact with the surface of a rubber roller to deform the polarizing plate, and the rubber roller attaches the polarizing plate to the liquid crystal cell via the carrier tape. is there.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the polarizing plate is mechanically moved and bonded, so that the production efficiency is poor. With an automatic sticking machine, it is mechanically difficult to stick a plurality of pieces at the same time, and even with a semi-automatic sticking machine, a plurality of pieces can be stuck at the same time in a row, but no more can be stuck.

It is an object of the present invention to provide a highly efficient method for sticking a polarizing plate for a liquid crystal display device, in which a liquid crystal cell and a polarizing plate are arranged in a matrix, and multi-row simultaneous sticking can be performed.

[Means for solving problems]

In order to achieve the above object, a method of sticking a polarizing plate for a liquid crystal display device according to the present invention is a method of positioning a plurality of liquid crystal cells on a liquid crystal cell suction base and a plurality of suction discharge holes provided on the polarizing plate suction base. Of the three adsorption / ejection holes arranged in the longitudinal direction of each polarizing plate so as to adsorb and retain each polarizing plate. The portion of each polarizing plate adsorbed by the first adsorption / ejection hole located at either one of the ends of the plate is attached to each of the opposing liquid crystal cells by blowing high-pressure air from the first adsorption / ejection hole, The portion of each polarizing plate adsorbed by the second adsorption / ejection hole located at the center of each polarizing plate is attached to each liquid crystal cell facing each other by blowing out high-pressure air from the second adsorption / ejection hole. A portion of each polarizing plate adsorbed by the third adsorption / ejection hole located at the other end is attached to each liquid crystal cell facing the liquid crystal cell by blowing high-pressure air from the third adsorption / ejection hole. A feature is that a polarizing plate is attached to each liquid crystal cell.

[Action]

When the liquid crystal cell and the polarizing plate are opposed to each other and the plurality of suction holes holding the polarizing plate are switched to high pressure air from one end side to the other end side, the polarizing plate is attached from the end surface of the liquid crystal cell. As in the conventional case, bubbles are not caught between the adhesive surface of the polarizing plate and the liquid crystal cell. Further, since there is no mechanical restriction, the liquid crystal cell and the polarizing plate can be arranged in a matrix shape, and a large number of 5 to 6 times as many as the prior art can be attached at the same time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a basic principle diagram of sticking the polarizing plate 1 to the liquid crystal cell 2.
The figure is a plan view of the adsorption surfaces of a polarizing plate adsorption base 3 that adsorbs and holds the polarizing plate 1 and a liquid crystal cell adsorption base 4 that adsorbs and holds the liquid crystal cell 2. Positioning pins 5 are implanted in the polarizing plate suction base 3 so as to position the polarizing plate 1 in a matrix. The polarizing plate suction base 3 is provided with three suction holes 3a, 3b, 3c for one polarizing plate 1 in the longitudinal direction of the polarizing plate 1 in order to suck and hold the positioned polarizing plate 1. The suction holes 3a, 3b, 3c have such a structure that the suction holes 3a on the one end side can be sequentially switched to the high pressure air discharge holes 3b, 3c in the pasting process. Positioning pins 6 for positioning the liquid crystal cells 2 in a matrix are implanted in the liquid crystal cell adsorption base 4 at the portions corresponding to the polarizing plate adsorption base 3. In addition, the liquid crystal cell 2 is positioned on the liquid crystal cell adsorption base 4.
In order to adsorb and hold the liquid crystal cell 1, one liquid crystal cell 2 is provided with one adsorption hole 4a extending in the longitudinal direction of the liquid crystal cell 2.

Next, the sticking method will be described. The polarizing plate 1 is previously positioned on the polarizing plate suction base 3 by the positioning pin 5, and then the suction holes 3a, 3b, 3c are evacuated to vacuum-suck the polarizing plate 1 to the polarizing plate suction base 3. Here, the polarizing plate 1 has a polarizing plate suction base 3 on the side opposite to the adhesive side.
To be held by adsorption. Similarly, in the liquid crystal cell 2, the liquid crystal cell 2 is positioned on the liquid crystal cell suction base 4 by the positioning pin 6, and then the suction hole 4a is evacuated to a vacuum.
Are vacuum-adsorbed on the liquid crystal cell adsorption base 4.

Next, as shown in FIG. 1 (a), the polarizing plate 1 adsorbed and held by the polarizing plate adsorbing base 3 and the liquid crystal cell 2 adsorbed and held by the liquid crystal cell adsorbing base 4 are parallel gear caps of about 0.5 to 1.0 mm. Keep and keep facing each other and set in parallel. In this state, as shown in (b), (c) and (d) of the same figure, the suction holes 3a on the one end side are sequentially switched to the high pressure air holes 3b and 3c. FIG. 7B shows the state immediately after the sticking has started. The suction holes 3a at the ends turn into discharge ports for high-pressure air, and the ends of the polarizing plate 1 are bonded to the surface of the liquid crystal cell. The other two suction holes 3b and 3c continue to be in a suction state and hold the polarizing plate 1. FIG. 7C shows a state in which the adhering process progresses and the central suction hole 3b is also changed to a high-pressure air discharge hole. 3 (d) is 3
All the suction holes 3a, 3b, 3c are changed to high pressure air discharge holes,
The state where the pasting is completed is shown.

In this way, since the high-pressure air is used to sequentially bond from the ends, air bubbles are not entrained. Further, since there is no mechanical limitation, it is possible to attach the polarizing plate 1 and the liquid crystal cell 2 in a matrix form in multiple rows at the same time. As a result, 210 rows for cameras and 70 rows for watches can be stretched at the same time, greatly improving efficiency.

FIG. 3 is an apparatus based on the above-mentioned basic principle, and this embodiment shows a semi-automatic polarizing plate bonding method in which two polarizing plates are bonded to both surfaces of a liquid crystal cell. 1 and 2
The same or corresponding members as those shown in the figure are designated by the same reference numerals, and the description thereof will be omitted. However, in the present embodiment, two polarizing plates are used. Will be described with a subscript A after the number and a subscript B for the other polarizing plate-related member.

The upper polarizing plate suction base 3A is rotatably attached to the column 7 and abuts on the stopper 8 to be held horizontally.
On the right side of the upper polarizing plate suction base 3A, a lower polarizing plate suction base 3B rotatably attached to the support column 9 is arranged, and the lower polarizing plate suction base 3B is brought into contact with the support base 10 to be held in a horizontal state. ing. A liquid crystal cell adsorption base 4 is disposed on the right side of the lower polarizing plate adsorption base 3B. The liquid crystal cell adsorption base 4 is placed on an XY table 10 having a well-known structure, and is vertically moved by a Z drive mechanism (not shown). It is about to do.

Therefore, as shown in FIG. 3 (a), first, the upper polarization plate 3A, the lower polarization plate adsorption base 3B, and the liquid crystal cell adsorption base 4 are placed on the upper polarization plate as described in FIG. 1 and FIG. Board
Each of 1A, the lower polarizing plate 1B, and the liquid crystal cell 2 is arranged in a matrix and positioned and fixed by vacuum suction. Next, as shown in FIG. 3 (b), the lower polarizing plate adsorption base 3B is inverted so that the lower polarizing plate 1B and the liquid crystal cell 2 face each other. This state is the same as that shown in FIG. Next, FIG. 1 (b)
The lower polarizing plate 1B is attached to the liquid crystal cell 2 by the action of the high pressure air described in (c) and (d). In this state,
Since the liquid crystal cell 2 to which the lower polarization plate 1B is attached is held by the liquid crystal cell adsorption base 4, the liquid crystal cell 2 is next transferred to the lower polarization plate adsorption base 3B. However, if it is delivered as it is, the lower polarizing plate 1B may hit the positioning pin 5 shown in FIGS. 1 and 2, so the liquid crystal cell adsorption base 4 is slightly moved in the XY direction by the XY table 10. Make a slight gap between the lower polarizing plate 1B and the positioning pin 5. Then, the liquid crystal cell adsorption base 4 is raised by a Z drive mechanism (not shown), and the lower polarizing plate 1B is brought into contact with the lower polarizing plate adsorption base 3B. Next, the vacuum of the liquid crystal cell adsorption base 4 is turned off, the high pressure air ejection port is switched to, the lower polarizing plate adsorption base 3B is switched to a vacuum, and the lower polarizing plate 1B is vacuum adsorbed to the lower polarizing plate adsorption base 3B.

Next, as shown in FIG. 3 (c), the lower polarizing plate suction base 3B is returned to its original position. At this time, the liquid crystal cell 2 to which the lower polarizing plate 1B is attached also moves together with the lower polarizing plate adsorption base 3B. Next, as shown in FIG. 3D, the upper polarizing plate suction base 3A
Is reversed, and the upper polarizing plate 1A is attached to the liquid crystal cell 2 by high pressure air in the same manner as described above. Then the same figure (e)
Return the upper polarizing plate adsorption base 3A to its original position as shown in.
As a result, the upper polarizing plate 1A and the lower polarizing plate 1B for the liquid crystal cell 2 are provided.
Pasting is completed.

〔The invention's effect〕

According to the present invention, since high-pressure air is used to sequentially attach from the end portion, there is no mechanical restriction, and the polarizing plate and the liquid crystal cell can be arranged in a matrix form to be attached in multiple rows at the same time. Efficiency is improved.

[Brief description of drawings]

1 (a) to 1 (d) are cross-sectional views of a polarizing plate adhering process showing an embodiment of the basic principle of the present invention, and FIG. 2 (a) is a plan view of the adsorption surface of the polarizing plate adsorption base of FIG. 2 (b) is a plan view of the adsorption surface of the liquid crystal cell adsorption base of FIG. 1, and FIGS. 3 (a) to 3 (e) are the double-sided liquid crystal cell process in which the basic principle of FIG. It is a side view. 1, 1A, 1B ... Polarizing plate, 2 ... Liquid crystal cell, 3, 3A, 3B ... Polarizing plate adsorption base, 3a, 3b, 3c ... Adsorption hole, 4 ... Liquid crystal cell adsorption base, 4a
…… Suction hole.

Claims (1)

[Claims] 1. A plurality of liquid crystal cells positioned and fixed to a liquid crystal cell suction base, and a plurality of polarizing plates suction-held to the polarizing plate suction base by a plurality of suction discharge holes provided in the polarizing plate suction base. Of the three adsorption / ejection holes arranged in the longitudinal direction of the respective polarizing plates so as to adsorb and hold the respective polarizing plates, the first adsorption / ejection hole located at one end of each polarizing plate. The high pressure air is blown out from the first adsorption / ejection hole to the opposing liquid crystal cells to stick the part of each polarizing plate adsorbed by the second adsorption / ejection hole located in the center of each polarizing plate. A portion of each polarizing plate is attached to each liquid crystal cell facing each other by blowing out high pressure air from the second adsorption / ejection hole, and is adsorbed by the third adsorption / ejection hole located at the other end of each polarizing plate. Each polarizing plate A polarizing plate for a liquid crystal display device, characterized in that each polarizing plate is attached to each liquid crystal cell by attaching a portion to each liquid crystal cell facing each other by blowing out high-pressure air from the third adsorption / ejection hole. Sticking method.