JPH0820628B2 - Liquid crystal display panel manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a liquid crystal display panel, and more particularly to a method for laminating two substrates.

2. Description of the Related Art In a method of manufacturing a liquid crystal display panel in which a liquid crystal is sealed between two electrode substrates, a method of bonding the two substrates is to use a spacer with a substrate coated with a sealing material and the other substrate. A general method is to heat and cure the sealing material in a state in which the cells that have been superposed on each other via a sheet and pasted together are pressurized.

FIG. 4a shows an explanatory view of such a conventional bonding method, in which one of the two electrode substrates 1 and 2 is coated with a sealing material 3 containing a spacer material and is overlaid via a spacer 4. The combined cells 5 are stacked alternately with an elastic body such as a silicone rubber block 6 along the warp of the substrate, and the pressing plate 7
The cell 5 is pressed by a rigid pressing body 8 having According to such a pressurizing method, the pressure distribution 9 as shown in FIG. 4B is obtained, the load applied on the seal 3 located around the substrate is smaller than that in the central portion, and the viscosity of the seal material is reduced. When it is strong, the cell gap cannot be narrowed to a predetermined gap determined by the diameter of the spacer material mixed in the sealing material, and it is difficult to obtain the gap uniformity.

FIG. 5 and FIG. 6 show an example of a conventional pressurizing method in which this point is improved. Instead of using the flat plate-shaped silicon rubber block 6, a cell-shaped sealing portion is provided through a ring-shaped silicon rubber 10. Silicon rubber block with a large number of protrusions as shown in the figure
The central portion of the cell 5 is pressed by 11. With such a configuration, it is possible to independently set the pressing conditions of the seal portion and the central portion of the cell to the optimum conditions.

Problems to be Solved by the Invention Even in such an example in which the uniformity of the pressure applied to the cell is improved, if the pressing body 8 that is a rigid body presses, the thickness and density of the annular silicon rubber 10 and the silicon rubber block 11 vary. As a result, for example, an imbalance of the pressing force as shown in FIG. 6 occurs, and as a result, the cell gap becomes nonuniform. To prevent this, make the flatness of the silicone rubber highly accurate,
And the density must be uniform.

When the sealing material is thermosetting, stress is generated due to the thermal expansion of the silicone rubber in order to keep it pressurized at the high temperature in the configuration shown in FIG. 5, and the cell gap becomes smaller than a predetermined size. In addition, there is a problem in that the applied pressure becomes imbalanced due to the difference in the amount of deformation due to the thermal expansion of the silicon rubber, and it is difficult to obtain the gap uniformity over the entire cell surface.

Means for Solving the Problems The present invention has the following configurations in order to solve the above problems. That is, as means for pressing a cell, a pair of rigid members that press the cell from both sides of the cell via elastic bodies, a spring that presses one of the rigid members at its center, and a point press by the spring. Having a positioning means for restraining displacement of the rigid body member in the in-plane direction of the substrate,
The rigid member point-pressed by the spring has a degree of freedom in the displacement direction of the spring and the rotational direction with the spring pressing point as a fulcrum.

In this way, as a method of pressing the cell, by pressing one of the rigid body parts holding the elastic body at the center of the surface opposite to the cell relative surface, the thickness and density of the silicon rubber holding the cell and the Even if there is unevenness in deformation due to thermal expansion, there is no imbalance in the distribution of the pressing force of the cells, so unevenness in the cell gap does not occur.

Further, in the rigid member point-pressed by the spring, the displacement of the substrate and the displacement in the in-plane direction of the substrate with the spring-pressing point as a fulcrum are restrained by the positioning means, so that the substrate is not displaced.

Also, by using a rigid point press and a spring,
Can absorb the stress generated by the thermal expansion of silicone rubber,
Moreover, since the pressing force applied to the cell can always be made constant only by fixing the relative position between the spring holding member that holds the spring and the cell, it is possible to easily realize a device that stably obtains a uniform cell gap. You can

Examples Hereinafter, the present invention will be described in detail according to Examples of the present invention. FIG. 1a shows a state of laminating and pressurizing a cell 5 showing an embodiment of the present invention. In FIG. 1, a sealing material 3 containing a spacer material is applied to one of the two electrode substrates 1 and 2 and a ring silicon rubber 10 is used as a means for pressing the superposed cells 5 via the spacer 4. The central portion is pressed by a silicone rubber 21 having a smaller rigidity, for example, a panel-contacting surface having a smaller projection shape than that of the silicone rubber 21. These silicone rubbers are held by the rigid members 22 and 24. The rigid member 24 is point-pressed by a spring attached to the pressure body 26. If a spring plunger 25 is used as this spring, the attachment is easy and the spring is deformed in a direction perpendicular to the axis of the spring. There is nothing to do.

The spring plunger 25 is arranged so that force acts on the normal line at the center of symmetry of the plane of the cell 5,
Rigid member 24 that receives force from this spring plunger
Is point-pressed by the spring plunger 25 at the center as described above, and the hole through which the support shaft 23 passes is the first
As shown in FIG. B, since there is a portion having a taper with respect to the axis of the support shaft 23 and a very small parallel portion determined by the fitting accuracy of the shaft in the vicinity of the surface height of the substrate, the cell 5 is displaced in the in-plane direction. There are few, and it is possible to press a substantially constant position and to rotate to a certain angle in the direction shown by the arrow in FIG. Therefore, even if there is unevenness in the thickness and density of the silicone rubber or the deformation due to the thermal expansion of the silicone rubber in the high temperature furnace, the uniformity of the pressure distribution applied to the cells is maintained.

3A and 3B show a part of a method for manufacturing an active matrix type color display panel according to the present invention.

In FIG. 3, one electrode substrate 31 is a four-piece substrate on the surface of which a thin film transistor element serving as a switching element and an image element for image display is attached by vapor deposition and photofabrication technique. On this substrate, an electrode substrate 32 coated with a sealant containing a spacer material is laminated around the other color filter. This laminated substrate is silicon rubber
In order to press from above and below with 33, the substrate 32
Four rigid members 35, whose sides are pressed by silicon rubber, are held via two positioning shafts 36, respectively.
It is point-pressed by a spring plunger 37 at each center. In this case, even when the base 34 and the rigid member 38 have relatively low parallelism on the substrate side, the rigid member 35 that presses the substrate 32 on which the color filter is formed is pressed by the spring plunger 37. Since there is a degree of freedom in the direction of rotation with the point as the fulcrum, each substrate can be followed and the same pressing force can be applied to the four cells.

EFFECTS OF THE INVENTION As described above, according to the present invention, even if there is some unevenness in the flatness and density of the silicon rubber that holds the cell and the deformation due to thermal expansion, the distribution of the pressing force of the cell is unbalanced. It is possible to obtain a cell pressing device that does not cause the occurrence of the problem with a relatively simple configuration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of an apparatus for carrying out the liquid crystal display panel manufacturing method of the present invention, and FIG. 2 is an embodiment of the present invention in which the center of the surface opposite to the cell relative surface is pressed by a spring, The figure which shows the behavior of the rigid body member which presses a cell via an elastic body, FIG. 3 is the top view and sectional drawing which show the application example of this invention at the time of pasting before cut | disconnecting a board | substrate of multiple pieces, 4th
FIG. 1 is a diagram showing a cell pressurizing device and its pressure distribution in a conventional liquid crystal display panel manufacturing method, and FIGS. 5 and 6 are a sectional view and a principle view of a conventional liquid crystal display panel manufacturing device. 1,2,31,32 …… Electrode substrate, 3 …… Sealant, 4 …… Spacer, 5 …… Cell, 6 …… Elastic body, 7,8,26,38 …… Pressure body, 9 …… Pressure distribution vector, 10 …… annular silicone rubber, 21 …… center pressure silicone rubber, 22,34 …… base, 2
3,36 …… Support shaft, 24,35 …… Rigid body member, 25,37 …… Spring plunger, 33 …… Elastic body.

Claims (4)

[Claims] 1. A method for manufacturing a liquid crystal display panel, which comprises a step of curing the sealing material while pressing a cell in which two electrode substrates are superposed through a sealing material containing a spacer material. A pair of rigid members that press the cell from both sides via elastic bodies, a spring that presses one of the rigid members at the center, and a rigid member that is pressed by the spring in the in-plane direction of the substrate. A liquid crystal display panel having a positioning member for restraining displacement, wherein the rigid member point-pressed by the spring has a degree of freedom in a displacement direction of the spring and a rotation direction with a spring pressing point as a fulcrum. Production method. 2. A spring for pressing a rigid member when the sealing material is heated and hardened, has a displacement larger than a displacement amount due to thermal expansion of an elastic body holding a cell. A method for manufacturing the liquid crystal display panel described. 3. A method of manufacturing a liquid crystal display panel according to claim 1, wherein a spring plunger is used as a spring for pressing the rigid member to a point. 4. A rigid member that is point-pressed by a spring is positioned by a shaft, and a hole through which the shaft of the rigid member passes is tapered with respect to an axis of a support shaft. A method of manufacturing a liquid crystal display panel according to item 1.