JP4118166B2 - Ferroelectric liquid crystal display panel heating device - Google Patents

Description

[0001]
BACKGROUND 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 of dropping liquid crystal on one surface of one substrate and then bonding it to the other substrate, a method of providing a liquid crystal injection port and an exhaust port in a liquid crystal display panel, and injecting the liquid crystal by a pressure difference between the inside and outside of the panel, For example, a method of reducing the viscosity and injecting by capillary action may be used.
[0003]
Above all, the liquid crystal injection method using the above-mentioned capillary phenomenon does not apply a particularly large pressure to the liquid crystal display panel, and can prevent disorder of liquid crystal alignment, damage to the panel substrate itself, displacement of the sealing material, and the like. Has been used a lot.
[0004]
FIG. 1 is a schematic view showing a conventional liquid crystal display panel heating device according to a liquid crystal injection process using the capillary phenomenon described above. Hereinafter, a conventional heating apparatus for a liquid crystal display panel will be briefly described with reference to FIG.
[0005]
A plurality of heating plates, which are heating sources, are provided in the apparatus, and one liquid crystal display panel is mounted 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]
Japanese Patent Laid-Open No. 9-269492 (page 2-3, FIG. 3)
[0007]
[Problems to be solved by the invention]
As described above, in a conventional liquid crystal display panel heating apparatus, one heating plate is used for each mounting stage of the heating apparatus, and one or more liquid crystal display panels are mounted thereon and heated. It has a configuration. For this reason, when a large number of liquid crystal display panels are to be heat-treated at the same time, there are problems in that the heating plate is required for the number of mounting stages and the entire apparatus is enlarged. In addition, since the ferroelectric liquid crystal tends to cause alignment defects such as zigzag (ZZ) defects due to the structure of the liquid crystal molecules, it is necessary to uniformly heat and cool each liquid crystal display panel.
[0008]
The present invention has been made in view of the above problems, and reduces the number of heating plates, reduces the size of the entire heating device, and zigzag (ZZ) defects during mass heating processing of a ferroelectric liquid crystal display panel. An object of the present invention is to provide a heating device for a ferroelectric liquid crystal display panel that can suppress the occurrence of alignment defects such as the above.
[0009]
[Means for Solving the Problems]
A heating apparatus for a ferroelectric liquid crystal display panel having a heating plate , comprising at least a mounting pallet having a recess for storing the ferroelectric liquid crystal display panel, and storing the mounting pallet in a plurality of layers. A ferroelectric liquid crystal display panel heating device having a mounting pallet storage magazine and a pair of movable heating plates or a fixed heating plate and a movable heating plate that sandwich the side surface of the mounting pallet storage magazine.
[0010]
DETAILED DESCRIPTION OF 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 ferroelectric liquid crystal display panel (hereinafter referred to as liquid crystal display panel) heating apparatus according to the present invention. A plurality of liquid crystal display panels 5 are mounted on a mounting pallet 4 for transmitting contact heat to the entire liquid crystal display panel 5, and the mounting pallet 4 is a mounting container that is a storage container for the mounting pallet 4. A plurality of sheets are stored in the pallet storage magazines 3a and 3b. Furthermore, the mounting pallet storage magazines 3a and 3b are sandwiched between a fixed heating plate 2 and movable heating plates 1a and 1b, and contact heat using these three heating plates 1a, 1b and 2 as a heating source. The liquid crystal display panel 5 is heated by propagation. Also, a plurality of pipe-like rails 8 for supporting and placing 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 the heat treatment in the present invention. 4 is a perspective view showing the placement pallet 4, FIG. 5 is a perspective view showing a state in which the liquid crystal display panel 5 is placed on the placement pallet 4, and FIG. It is a perspective view which shows the state accommodated in the pallet storage magazine 3a or 3b. Here, the structure which concerns on accommodation of the mounting pallet 4 is demonstrated in order of a work process with reference to FIGS.
[0013]
The flow of the work process is as follows: placing the liquid crystal display panel 5 on the placement pallet 4 → liquid crystal application → housing the placement pallet 4 in the placement pallet storage magazines 3a and 3b → evacuating the liquid crystal display panel 5 → heating treatment (liquid crystal 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 with a sealant (not shown), as shown in FIG. It mounts on the mounting pallet 4 for mounting. At this time, the mounting pallet 4 is formed with a recess 7 for positioning the liquid crystal display panel 5 and is placed in a manner of being fitted therein as shown in FIG. Thereafter, the ferroelectric liquid crystal 6 is applied to the liquid crystal inlet formed in the inter-substrate gap of the liquid crystal display panel 5 by a dispenser (not shown).
[0015]
As the role of the mounting pallet 4, the concave portion 7 is provided, and the liquid crystal display panel 5 is mounted in the concave portion 7, thereby improving the adhesion with the mounting pallet 4 as a heat medium, and the mounting pallet. For example, it is possible to improve the efficiency of storage in the mounting pallet storage magazines 3a and 3b, which are storage containers.
[0016]
The above-mentioned dispenser may be any one as long as it can perform accurate liquid crystal application, and details thereof will not be described in this specification.
[0017]
Next, 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 as shown in FIG. To do. Then, after the storage of the mounting pallet 4 is completed, the above-described mounting pallet storage magazines 3a and 3b are put into the heating device of the present invention installed in a vacuum chamber (not shown), the liquid crystal display panel 5 is evacuated, and the liquid crystal Make an injection.
[0018]
At that time, as shown in FIG. 2, the placement pallet storage magazines 3 a and 3 b are respectively arranged with the fixed heating plate 2 provided in the center of the heating device sandwiched therebetween, so as to face the fixed heating plate 2. And are held in close contact with the movable heating plates 1a and 1b. Then, after evacuation, the heating plates 1a, 1b, and 2 are energized to generate heat, the viscosity of the ferroelectric liquid crystal 6 is lowered by the heat, and liquid crystal is injected by capillary action.
[0019]
The heat propagation path is roughly divided into four stages such as heating plates 1a, 1b, 2 → mounting pallet storage magazines 3a, 3b → mounting pallet 4 → liquid crystal display panel 5.
[0020]
For the heating plates 1a, 1b, and 2, a structure using a film heater in which a heating resistance wire is sandwiched between film materials such as silicon rubber is used, but a pipe heater that circulates a heat medium such as oil is used for the pipe. However, the present invention is not limited to this.
[0021]
The reason for using not only the fixed type but also the movable type heating plates such as the movable type heating plates 1a and 1b is that the heating plates 1a, 1b and 2 are securely attached to the side surfaces of the mounting pallet storage magazines 3a and 3b. In order to increase the heat propagation efficiency from the heating plates 1a, 1b, and 2, and to efficiently attach and detach the mounting pallet storage magazines 3a and 3b to the heating device body.
[0022]
However, it is not always necessary to use two types of fixed and movable heating plates, and only a movable type may be used as long as reliable adhesion to the mounting pallet storage magazines 3a and 3b can be obtained.
[0023]
In addition, although the rail 8 is provided at the bottom of the heating device, the cooling is performed by natural cooling. However, since the bottom of the heating device has residual heat, a temperature difference occurs between the upper and lower sides of the mounting pallet storage magazines 3a and 3b during cooling. . In order to perform stable cooling, it is desirable to place the mounting pallet storage magazines 3a and 3b as centrally as possible in the heating device. For this reason, by providing the rail 8, the mounting pallet storage magazines 3a and 3b are raised so as to be arranged at the approximate center of the heating device, the contact area with the bottom of the heating device is reduced, and temperature variation between the upper and lower sides Is suppressed. Therefore, as the material of the rail 8, it is desirable to use a material having low thermal conductivity (SUS in the embodiment). Furthermore, since the friction between the mounting pallet storage magazines 3a, 3b and the heating device bottom is reduced by the rail 8, the mounting pallet storage magazines 3a, 3b can be easily attached to and detached from the heating device.
[0024]
FIG. 7 is a graph showing a result of temperature measurement under atmospheric pressure in a conventional heating apparatus, and shows a temperature change with respect to time. FIG. 8 is a graph showing the results of temperature measurement under atmospheric pressure in the heating apparatus of the present invention, and represents the temperature change with time as in FIG. The temperature measurement positions are points A to D in FIG.
[0025]
7 is compared with FIG. 8, the conventional heating device of FIG. 7 has a variation in temperature at each point A to D, whereas the heating device of the present invention of FIG. 8 has a variation in temperature. It is understood that is hardly seen. That is, in the case of using the heating device of the present invention, it can be said that uniform heat propagation with no variation in temperature is performed.
[0026]
FIG. 9 is a graph showing the results of the temperature measurement in the present invention performed under vacuum pressure instead of atmospheric pressure, and represents the temperature change with time as in FIGS.
[0027]
Comparing FIG. 8 and FIG. 9, there is no particular variation in temperature in the graph under vacuum pressure in FIG. 9 as in the graph under atmospheric pressure in FIG. That is, in the heating apparatus of the present invention, it can be said that uniform heat propagation is possible regardless of atmospheric pressure / vacuum pressure.
[0028]
In addition, aluminum (Al), which has excellent thermal conductivity, was used as the material for basic components such as the loading pallet storage magazine. However, the higher the thermal conductivity, the more effective the uniform heat transfer. Yes, it is not limited to that.
[0029]
It is also possible to freely change the design to some extent by increasing the number of mounting pallet storage magazines and changing the number and arrangement of 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 not only the whole heating apparatus can be reduced by reducing the number of heating plates, but also the heating plate → Zigzag generated in ferroelectric liquid crystal due to contact heat propagation in the order of mounting pallet storage magazine → mounting pallet → liquid crystal display panel, enabling uniform heating and cooling treatment regardless of atmospheric pressure / vacuum pressure. (ZZ) Orientation defects such as defects can be suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a conventional heating apparatus. 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. 5 is a perspective view showing a state in which the liquid crystal display panel is placed on a placement pallet. FIG. 6 is a perspective view showing a state in which the placement pallet is stored in a placement pallet storage magazine. Graph showing temperature change (under atmospheric pressure)
FIG. 8 is a graph showing the temperature change in the heating device of the present invention (under atmospheric pressure).
FIG. 9 is a graph showing changes in temperature 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)

A heating apparatus for a ferroelectric liquid crystal display panel having a heating plate , comprising at least a mounting pallet having a recess for storing the ferroelectric liquid crystal display panel, and storing the mounting pallet in a plurality of layers. Heating a ferroelectric liquid crystal display panel characterized by having a mounting pallet storage magazine and a pair of movable heating plates or a fixed heating plate and a movable heating plate that sandwich the side surface of the mounting pallet storage magazine apparatus.

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