JPH02129048A - Method for pressurizing liquid crystal glass - Google Patents

Abstract

PURPOSE:To make it possible to uniformly pressurize a liquid crystal glass even if unevenness and undulation exist on the surface by applying load of a weight to the point bringing into contact with a liquid crystal glass on upper side sandwiching a spacer through an elastic body and many spheres. CONSTITUTION:Each sphere 33 is loaded to a liquid crystal glass 11 in a point bringing each sphere 33 into contact with a liquid crystal glass 11 by putting a weight 31 through an elastic body 34 on each sphere 33 by slightly descending weight structural material 30. In this case, load of weight 31, which is dispersed as load of a number of points horizontally distributing in equal pitch is added to the liquid crystal glass 11 by each sphere 33. The liquid crystal glass 11 is uniformly pressurized regardless flatness of lower face of weight 31, unevenness of surface of liquid crystal glass 11 and tolerance of diameter of sphere 33 by transmitting load of weight 31 through the elastic body 34 to the sphere 33 and interval between the liquid crystal glass 11 and liquid crystal glass 12 is made uniform.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention provides a method for manufacturing a liquid crystal display panel, in which two pieces of liquid crystal glass are fixed together with a spacer interposed between them. This invention relates to a method for pressurizing liquid crystal glass.

``Prior art'' In manufacturing a liquid crystal display panel, two pieces of liquid crystal glass are used, with transparent electrodes and alignment films formed on each glass substrate, and a spacer and a solid adhesive for sealing attached to one of the glass substrates. The above-mentioned spacer and adhesive are sandwiched between the two, and the above-mentioned adhesive is heated while applying pressure so as to keep the distance between the two uniform, thereby adhering and fixing.

In this case, if the pressure applied to the two pieces of liquid crystal glass is uneven or insufficient, the distance between the two pieces of liquid crystal glass will not be uniform, and the liquid crystal will not be sealed between the two pieces of liquid crystal glass after they are fixed with adhesive. Inconveniences such as color unevenness occur in a liquid crystal display panel constructed using such a method.

Conventionally, in order to pressurize two pieces of liquid crystal glass as described above, the pressure was applied directly onto the two pieces of liquid crystal glass stacked on a mounting table.
The method used is to place a weight on it.

That is, as shown in FIG. 7, a mounting table 43 having a positioning bin 42 is provided on a base 41, and
A pair of pillars 46 and 47 are supported by bearings 44 and 45, respectively, to form a window 51 larger than the mounting table 43 in the center, and pillars 46 and 47 are mounted on both sides of the window 51.
A weight holder 54 with bearings 52 and 53 into which can be inserted is attached to the bearings 52 and 53, and the columns 46 and 47 are inserted into the weight holder 54.
By inserting the support columns 46 and 47 as guides, a pressurizing device with a weight 61 mounted on the window 51 of the weight holder 54 is prepared. As shown, place the weight holder 54 on the weight!
161 and held at a predetermined height position by a stopper (not shown in the figure). ! The two liquid crystal glasses 1) and 12 are positioned on the mounting table 43 with the pins 42 and placed with the spacer and adhesive sandwiched between them as described above, although not shown in the drawings, and then the Remove the stopper and place the weight holder 54 on the weight i! 61, and as shown in FIG. 8, the weight holder 54 is pushed into the bearings 44 and 45 shown in FIG. 7 on the base 41 with the mounting table 43 passing through the window 51 of the weight holder 54. At the same time, the weight 61 is placed on the liquid crystal glass 1) in a state separated from the weight holder 54 to apply pressure to the liquid crystal glass 1), and in this state, the above adhesive is heated to bond the liquid crystal glasses 1) and 12. After fixing with adhesive, the weight holder 54 is
! The liquid crystal glasses 1) and 12, which have been adhesively fixed by being moved upward together with 61, are removed from the mounting table 43.

"Problems to be Solved by the Invention" However, in the conventional pressurizing method described above, the weight 61 is brought into direct contact with the upper liquid crystal glass 1) to pressurize the liquid crystal glass 1). LCD glass 1)
The flatness of the surface in contact with the liquid crystal glass 1) directly affects the load distribution on the liquid crystal glass 1), and if the flatness is poor, the liquid crystal glass 1)
is not evenly pressurized, and liquid crystal glass 1) and liquid crystal glass 12
The liquid crystal glass 1) of the weight 61 will be unevenly spaced.
The weight 61 is adjusted so that the surface in contact with the
The disadvantage is that the surface of the weight 61 must be processed, and manufacturing of the weight 61 requires a large amount of cost.

Furthermore, even if the surface of the weight 61 that contacts the liquid crystal glass 1) is formed into a plane with sufficient precision, the weight 61 of the liquid crystal glass 1)
If there are irregularities or undulations on the surface that comes into contact with the liquid crystal glass 1), the pressure applied to the liquid crystal glass 1) will become uneven, and in practice, it is difficult to avoid small irregularities or undulations occurring on the surface of the liquid crystal glass 1). It was very difficult to uniformly pressurize the liquid crystal glass 1) and make the distance between the liquid crystal glass 1) and the liquid crystal glass 12 uniform.

Therefore, in manufacturing a liquid crystal display panel, this invention applies pressure to the liquid crystal glass in a method of pressurizing the two pieces of liquid crystal glass when bonding and fixing the two pieces of liquid crystal glass with a spacer sandwiched between them. Even if the surface of the weight to be added is not flat with sufficient precision, it does not require a large amount of money to manufacture the weight, and even if the surface of the liquid crystal glass has unevenness or undulations, it can be applied uniformly to the liquid crystal glass. It can be pressurized and the distance between the two pieces of liquid crystal glass can be made uniform.

"Means for Solving the Problem" In this invention, first, two pieces of liquid crystal glass are positioned and placed on a mounting table with a spacer sandwiched between them, and then the upper liquid crystal A large number of spheres with the same diameter are brought into contact with the glass, each arranged at an equal pitch in the horizontal direction, and a flat weight is placed on each sphere via a flat elastic body. The load of this weight is applied to the upper liquid crystal glass through the elastic body and each sphere at the point where each sphere contacts the upper liquid crystal glass.

"Function" In the pressurizing method of the present invention, which takes the method described above, the load of the weight is distributed by each sphere as a load of many points distributed at equal pitches in the horizontal direction, and is applied to the upper liquid crystal glass. At the same time, at each point, the load of the weight is transmitted to the sphere via the elastic body, so that the flatness of the surface of the weight, the unevenness of the surface of the upper liquid crystal glass, the tolerance of the diameter of the sphere, etc. is absorbed by the vertical elastic deformation of the elastic body at each point, and the upper liquid crystal glass is uniformly pressurized at each point, so that the distance between the two pieces of liquid crystal glass becomes uniform.

"Example" Figures 1, 2, and 3 show the states in each step of an example of the pressurizing method of the present invention, and Figures 4 and 5 show the conditions used in the pressurizing method of the present invention. An example of a pressurizing device is shown.

The pressurizing device of this example is provided with a mounting table 23 having a positioning pin 22 on a base 21, a pair of guides 24 and 25, and a circular hole in the lower surface of a flat weight 31 made of metal. A flat plate-shaped spherical holder 32 having a large number of 32a is attached parallel to the lower surface of the weight 31, and the weight i! 31 and the spherical boulder 32, the spherical holder 32
A weight structure 30 in which one sphere 33 having the same diameter is placed in each hole 32a, and a flat elastic body 34 made of rubber, plastic, etc. is placed between the weight 31 and each sphere 33. can be moved up and down along guides 24 and 25 parallel to the mounting table 23.

The holes 32a of the sphere holder 32 are formed at constant pitches Px and py in one direction and in the direction orthogonal thereto, respectively, and have the same diameter, which is slightly smaller than the diameter of the sphere 33. A part of each always faces the bottom side of the sphere holder 32 through the hole 32a of the sphere holder 32, and the position of each is restricted in the horizontal direction with respect to the weight 31 and the sphere holder 32, but the position of each is regulated in the vertical direction. is allowed to move within a certain range relative to the weight 31 and the sphere holder 32.

First, as shown in FIG. 4, the weight structure 30 is moved upward and held at a predetermined height position by a stopper (not shown in the figure), and then positioned on the mounting table 23 by the bin 22. Then, two liquid crystal glasses 1) and 12 are placed.

Liquid crystal glasses 1) and 12 each have a receding electrode and an alignment film formed on their glass substrates, and as shown in FIG. This liquid crystal glass 1 is attached with a small diameter spherical spacer 13 and a solid adhesive 14 for sealing.
) and 12 are placed on the mounting table 23 with the spacer 13 and adhesive 14 sandwiched between them.

In this state, as shown in FIG. 1, the elastic body 34 is separated from the bottom surface of the weight 31, and the largest portion of each sphere 33 is removed from the hole 32a of the sphere holder 32 due to its own weight and the weight of the elastic body 34. Facing the bottom.

Next, the stopper is removed, and the weight structure 30 is lowered to bring each sphere 33 into contact with the upper liquid crystal glass 1). At the moment each sphere 33 comes into contact with the liquid crystal glass 1), as shown in FIG.
Each sphere 33 and elastic body 34 are in the same positional relationship as before each sphere 33 contacts the liquid crystal glass 1).

Furthermore, the weight structure 30 is lowered slightly, that is, the weight i! 31 and the sphere holder 32 are slightly lowered,
As shown in FIG. 3, an elastic body 3 is placed on each sphere 33.
By placing the weight 31 through the elastic body 34 and the respective spheres 33, the weight 31 is applied to the liquid crystal glass 1) at the point where each sphere 33 contacts the liquid crystal glass 1). do.

In this case, the load of the weight 31 is applied to the liquid crystal glass 1) by being distributed by each sphere 33 as a load at many points distributed at equal pitches in the horizontal direction, and at each point, the load of the weight 31 is applied to the liquid crystal glass 1). is transmitted to the sphere 33 via the elastic body 34, so that the flatness of the lower surface of the weight 31, the unevenness of the surface of the liquid crystal glass 1), the tolerance of the diameter of the sphere 33, etc. are determined by the elastic body 34 at each point. The pressure is absorbed by the elastic deformation in the vertical direction of the liquid crystal glass 1), and the pressure is applied uniformly to the liquid crystal glass 1) at each point.
The distance between the liquid crystal glass 12 and the liquid crystal glass 12 becomes uniform.

With the liquid crystal glass 1) being pressurized in this manner, the adhesive 14 is heated to adhesively fix the liquid crystal glasses 11 and 12.

Thereafter, the weight structure 30 is moved upward to remove the adhesively fixed liquid crystal glasses 1) and 12 from the mounting table 23, and the adhesive 14 shown in FIG. A liquid crystal is put between the liquid crystal glass 1) and the liquid crystal glass 12 through the open opening 15, the opening 15 is sealed, and a polarizing plate is attached to the outside of the liquid crystal glasses 1) and 12, respectively.

In addition, although the above-mentioned example is a case where the sphere holder 32 is attached to the weight 31 to configure the weight structure 30, the sphere holder 32 holding each sphere 33 is made separate from the weight 31, and the elastic body 34 to the bottom surface of the weight 31, or each sphere 33 held in the sphere holder 32.
After placing the liquid crystal glasses 1) and 12 on the mounting table 23, first, the sphere holder 32 is lowered along the guides 24 and 25 to bring each sphere 33 into contact with the liquid crystal glass 1). Then, move the weight 31 to the guide 24.
and 25, and the weight 31 may be placed on each sphere 33 via the elastic body 34.

"Effects of the Invention" As described above, according to the present invention, even if the surface of the weight that applies pressure to the liquid crystal glass is not flat with sufficient precision, the weight can be manufactured without requiring a large amount of cost. Moreover, even if there are irregularities or undulations on the surface of the liquid crystal glass,
The liquid crystal glass can be pressurized uniformly, and the distance between the two pieces of liquid crystal glass can be made uniform.

[Brief explanation of drawings]

1, 2, and 3 are cross-sectional views showing an example of the pressurizing method of the present invention when a liquid crystal glass is placed, when a sphere contacts it, and when pressurizing with a weight; 5 and 5 are a front view and a partially exploded perspective view showing an example of a pressurizing device used in the pressurizing method of the present invention, FIG. 6 is a perspective view showing two pieces of liquid crystal glass to be pressurized, and FIG. FIG. 8 is a perspective view showing the conventional pressurizing method when a liquid crystal glass is placed and when pressurizing with a weight.

Claims (1)

[Claims] (1) Position and place two pieces of liquid crystal glass on a mounting table with a spacer sandwiched between them, and place a large number of spheres with the same diameter on the upper liquid crystal glass, each in a horizontal direction. A flat weight is placed on each of the above spheres via a flat elastic body, and the load of this weight is transferred to the above elastic body and each of the above spheres. A method of pressurizing a liquid crystal glass, wherein a load is applied to the upper liquid crystal glass at a point where each of the spheres contacts the upper liquid crystal glass through a pressurizing method.