JP2004258555A - Device for heating ferroelectric liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-productivity device for heating a ferroelectric liquid crystal display panel, the device as a whole is downsized and uniform heat propagation is possible irrespective of heating under atmospheric pressure or under vacuum. <P>SOLUTION: A plurality of the ferroelectric liquid crystal display panels are placed and held on a placing and holding pallet. A housing magazine for the placing and holding pallets, a housing vessel for exclusive use thereof, housing a plurality of the pallets in layers is interposed between movable heating plates or between two kinds of, fixed type and a movable, heating plates and is constructed so as to perform a four step contact heat propagation of the heating plate, of the housing magazine for the placing and holding pallets, of the placing and holding pallets and of the ferroelectric liquid crystal display panels in this order. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating device for a ferroelectric liquid crystal display panel.
[0002]
[Prior art]
In general, several methods have been proposed for injecting liquid crystal into a liquid crystal display panel. For example, a method in which liquid crystal is dropped on one surface of one substrate and then bonded to the other substrate, a method in which a liquid crystal display panel is provided with a liquid crystal injection port and an exhaust port, and a liquid crystal is injected by a pressure difference between the inside and outside of the panel, A method of lowering the viscosity and injecting by capillary action is exemplified.
[0003]
Above all, the method of injecting liquid crystal utilizing the above-mentioned capillary phenomenon does not apply extra large pressure to the liquid crystal display panel, and can prevent disturbance of liquid crystal alignment, damage to the panel substrate itself, displacement of the sealing material, and the like. It is frequently used from.
[0004]
FIG. 1 is a schematic view showing a conventional heating device for a liquid crystal display panel in a liquid crystal injection step utilizing the above-mentioned capillary phenomenon. Hereinafter, a conventional liquid crystal display panel heating device will be briefly described with reference to FIG.
[0005]
A plurality of heating plates as heating sources are provided in the apparatus, and one liquid crystal display panel is placed on each of them, and the liquid crystal display panel is heated by contact heat propagation from each heating plate. (See Patent Document 1).
[0006]
[Patent Document 1]
JP-A-9-269492 (page 2-3, FIG. 3)
[0007]
[Problems to be solved by the invention]
As described above, in the conventional heating device for a liquid crystal display panel, one heating plate is used for each mounting stage of the heating device, and one or more liquid crystal display panels are mounted thereon and heated. It has a configuration. Therefore, when a large number of liquid crystal display panels are to be subjected to heat treatment at one time, there are problems that heating plates are required by the number of mounting stages, and that the entire apparatus becomes large. Further, in the ferroelectric liquid crystal, alignment defects such as zigzag (ZZ) defects are likely to occur due to the structure of the liquid crystal molecules. Therefore, it is necessary to uniformly heat and cool each liquid crystal display panel.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made to reduce the number of heating plates, reduce the size of the entire heating device, and reduce zigzag (ZZ) defects during large-scale heating of ferroelectric liquid crystal display panels. It is an object of the present invention to provide a heating device for a ferroelectric liquid crystal display panel, which can suppress the occurrence of poor alignment such as the above.
[0009]
[Means for Solving the Problems]
What is claimed is: 1. A heating device for a ferroelectric liquid crystal display panel having a heating plate, comprising: a mounting pallet on which at least the ferroelectric liquid crystal display panel is mounted; and a mounting pallet housing for storing a plurality of the mounting pallets in layers. And a heating device for a ferroelectric liquid crystal display panel having a magazine, wherein the mounting pallet storage magazine is sandwiched between movable heating plates or between a fixed type and a movable type of heating plate and heated.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a ferroelectric liquid crystal display panel heating apparatus according to an embodiment of the present invention will be described with reference to FIGS.
[0011]
FIG. 2 is a diagram showing an embodiment of a heating device for a ferroelectric liquid crystal display panel (hereinafter, referred to as a liquid crystal display panel) according to the present invention. A plurality of liquid crystal display panels 5 are mounted on a mounting pallet 4 for performing contact heat propagation on the entire liquid crystal display panel 5, and the mounting pallet 4 is a mounting container for the mounting pallet 4. A plurality of pallets are stored in the pallet storage magazines 3a and 3b. Further, the loading pallet storage magazines 3a and 3b are sandwiched between the fixed heating plate 2 and the movable heating plates 1a and 1b, and the contact heat using these three heating plates 1a, 1b and 2 as a heat source. The liquid crystal display panel 5 is heated by propagation. A plurality of pipe-shaped rails 8 for supporting and mounting the mounting pallet storage magazines 3a and 3b are provided at the bottom of the heating device.
[0012]
FIG. 3 is a perspective view showing the liquid crystal display panel 5 that performs a heat treatment in the present invention. 4 is a perspective view showing the placing pallet 4, FIG. 5 is a perspective view showing a state where the liquid crystal display panel 5 is placed on the placing pallet 4, and FIG. It is a perspective view showing the state stored in pallet storage magazine 3a or 3b. Here, a configuration related to storage of the mounting pallet 4 will be described in the order of working steps with reference to FIGS.
[0013]
The flow of the work process is as follows: the liquid crystal display panel 5 is placed on the placing pallet 4 → the liquid crystal application → the placing pallet 4 is placed in the placing pallet storage magazines 3a and 3b → the vacuum exhaust of the liquid crystal display panel 5 → the heating process (liquid crystal Injection), and the details are as follows.
[0014]
First, as shown in FIG. 3, a plurality of liquid crystal display panels 5 in which two substrates made of glass and silicon (Si) are bonded together via a sealing material (not shown) are provided. It is mounted on a mounting pallet 4 for mounting. At this time, a concave portion 7 for positioning the liquid crystal display panel 5 is formed in the mounting pallet 4, and as shown in FIG. Thereafter, a ferroelectric liquid crystal 6 is applied to a liquid crystal injection port formed in the gap between the substrates of the liquid crystal display panel 5 by a dispenser (not shown).
[0015]
The role of the mounting pallet 4 is to improve the adhesion with the mounting pallet 4 which is a heat medium by providing a concave portion 7 and mounting the liquid crystal display panel 5 in the recess 7. Increasing the efficiency of storage in the storage pallet storage magazines 3a and 3b, which are storage containers, may be mentioned.
[0016]
Further, as the above-mentioned dispenser, any liquid dispenser may be used as long as accurate liquid crystal application can be performed, and details thereof will not be described in this specification.
[0017]
Next, as shown in FIG. 6, the mounting pallet 4 is stored in a plurality of layers in the mounting pallet storage magazines 3a and 3b with the liquid crystal display panel 5 coated with the ferroelectric liquid crystal 6 mounted thereon. I do. After the storage of the mounting pallet 4 is completed, the mounting pallet storage magazines 3a and 3b described above are put into the heating device of the present invention installed in a vacuum chamber (not shown), and the liquid crystal display panel 5 is evacuated and the liquid crystal is Perform injection.
[0018]
At that time, as shown in FIG. 2, the loading pallet storage magazines 3 a and 3 b are arranged with the fixed heating plate 2 provided in the center of the heating device interposed therebetween, and are opposed to the fixed heating plate 2. And the movable heating plates 1a and 1b provided in the above. After the evacuation, the heating plates 1a, 1b, and 2 are energized to generate heat, and the heat reduces the viscosity of the ferroelectric liquid crystal 6 to perform liquid crystal injection by capillary action.
[0019]
The heat propagation path is roughly divided into four stages such as the heating plates 1a, 1b, 2 → the loading pallet storage magazines 3a, 3b → the loading pallet 4 → the liquid crystal display panel 5.
[0020]
For the heating plates 1a, 1b, and 2, a configuration using a film heater in which a heating resistance wire is sandwiched between film materials such as silicon rubber was used, but a pipe heater for circulating a heat medium such as oil through a pipe was used. A configuration having a different configuration may be used, and the present invention is not limited to this.
[0021]
The reason for using movable heating plates such as movable heating plates 1a and 1b as well as fixed heating plates is that the heating plates 1a, 1b and 2 are securely mounted on the side surfaces of the loading pallet storage magazines 3a and 3b. In order to increase the heat transfer efficiency from the heating plates 1a, 1b, and 2 and to allow the mounting pallet storage magazines 3a and 3b to be efficiently attached to and detached from the heating device body.
[0022]
However, it is not always necessary to use two types of heating plates, a fixed type and a movable type, and only a movable type may be used as long as reliable adhesion to the loading pallet storage magazines 3a and 3b can be obtained.
[0023]
Also, the reason why the rail 8 is provided at the bottom of the heating device is that cooling is performed by natural cooling, but the bottom of the heating device has residual heat, so that a temperature difference occurs between the upper and lower portions of the loading pallet storage magazines 3a and 3b during cooling. . In addition, in order to perform stable cooling, it is desirable to arrange the loading pallet storage magazines 3a and 3b as close to the center of the heating device as possible. For this reason, by providing the rail 8, the loading pallet storage magazines 3a and 3b are raised so as to be disposed substantially at the center of the heating device, the contact area with the bottom of the heating device is reduced, and the temperature variation between the top and bottom is reduced. It suppresses. Therefore, as the material of the rail 8, it is desirable to use a material having low thermal conductivity (SUS in the embodiment). Further, the rail 8 reduces friction between the loading pallet storage magazines 3a and 3b and the bottom of the heating device, thereby facilitating attachment and detachment of the loading pallet storage magazines 3a and 3b to and from the heating device.
[0024]
FIG. 7 is a graph showing a result of performing temperature measurement under atmospheric pressure in a conventional heating device, and shows a temperature change with respect to time. FIG. 8 is a graph showing a result of temperature measurement performed under the atmospheric pressure in the heating device of the present invention, and shows a temperature change with respect to time as in FIG. The temperature measurement positions are points A to D in FIG.
[0025]
7 and FIG. 8, in the conventional heating device of FIG. 7, the temperature varies at each of the points A to D, whereas in the heating device of the present invention in FIG. It can be seen that is hardly seen. That is, when the heating device of the present invention is used, it can be said that uniform heat propagation with no variation in temperature is performed.
[0026]
FIG. 9 is a graph showing the result of performing the temperature measurement in the present invention not under the atmospheric pressure but under a vacuum pressure, and shows a temperature change with respect to time as in FIGS. 7 and 8.
[0027]
Comparing FIG. 8 with FIG. 9, there is no particular temperature variation in the graph under the vacuum pressure in FIG. 9 as in the graph under the atmospheric pressure in FIG. That is, in the heating device of the present invention, it can be said that uniform heat propagation is possible regardless of the atmospheric pressure / vacuum pressure.
[0028]
In addition, aluminum (Al), which has excellent thermal conductivity, was used as the material of the basic components including the loading pallet storage magazine, but the higher the thermal conductivity, the more effective the uniform heat propagation. Yes, but not limited to it.
[0029]
It is also possible to freely change the design to some extent, for example, by increasing the number of magazines for placing pallets and changing the number and arrangement of the heating plates accordingly.
【The invention's effect】
According to the present invention, a large number of liquid crystal display panels can be heat-treated at a time in a limited space, and the reduction in the number of heating plates enables not only the miniaturization of the entire heating device, but also the heating plate → Contact heat propagation in the order of placement pallet storage magazine → placement pallet → liquid crystal display panel enables uniform heating and cooling treatment regardless of atmospheric pressure / vacuum pressure, and zigzag generated in ferroelectric liquid crystal (ZZ) Poor alignment such as defects can be suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a conventional heating device. FIG. 2 is a schematic view showing an embodiment of the present invention. FIG. 3 is a perspective view showing a liquid crystal display panel. FIG. 4 is a perspective view showing a mounting pallet. 5 is a perspective view showing a state in which the liquid crystal display panel is mounted on a mounting pallet. FIG. 6 is a perspective view showing a state in which the mounting pallet is stored in a mounting pallet storage magazine. Graph showing temperature change (under atmospheric pressure)
FIG. 8 is a graph showing a temperature change in the heating device of the present invention (under atmospheric pressure).
FIG. 9 is a graph showing a temperature change in the heating device of the present invention (under vacuum pressure).
[Explanation of symbols]
1a Movable heating plate 1b Movable heating plate 2 Fixed heating plate 3a Mounting pallet storage magazine 3b Mounting pallet storage magazine 4 Mounting pallet 5 Liquid crystal display panel 6 Ferroelectric liquid crystal 7 Recess 8 Rail

Claims (1)

What is claimed is: 1. A heating device for a ferroelectric liquid crystal display panel having a heating plate, comprising: a mounting pallet on which at least the ferroelectric liquid crystal display panel is mounted; A ferroelectric liquid crystal display panel having a magazine, wherein the mounting pallet storage magazine is sandwiched between movable heating plates or fixed and movable and heated by being sandwiched between two types of heating plates. Heating equipment.

Images