JP2004262205A - Apparatus for manufacturing polarization film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an excellent display characteristic of LCD by removing an irregularity in printing to be generated to the utmost when a polarization film is formed by printing to coat ink liquid of two-tone dye. <P>SOLUTION: Bearings 2, 2 are planted on both sides of a table 1, vertical grooves 3, 3 are provided to those bearings 2, 2, both ends of a shaft 5 of a plate cylinder 4 are dropped down by providing vertical grooves 3, 3 to those bearings 2, 2, and a shaft 5 of the plate cylinder 4 is movably fitted to left and right bearings 2, 2 thereby. The bearing 2, 2 are horizontally movably composed and connected to a horizontal transfer means (not given in the figure.). Further, weights 6, 6 which are uniform at left and right in weight are fitted to both sides of the shaft 5 of the plate cylinder 4. When a polarization film is manufactured, a substrate 7 is installed on a table 1, and a plate 8 having many fine grooves (a) is fitted to the plate cylinder 4 to be placed on the substrate 7. Then, ink liquid of two color dyes is coated on a plate 8 to form a thin film of the ink liquid on the surface thereof, and the bearings 2, 2 are horizontally moved along a printing direction. Thereby, the plate cylinder 4 rolls on the substrate 7 and a thin film of the ink liquid is coated by transfer on the substrate 7 from the plate 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for manufacturing a liquid crystal display, and more particularly to an apparatus for manufacturing a polarizing film to which a technique of forming a polarizing film by applying a dichroic dye ink is used.
[0002]
[Problems to be solved by the invention]
Conventionally, polarizing plates disposed on both sides of a liquid crystal cell have been attached to the outside of the liquid crystal cell that has passed panel inspection using an adhesive.
For this reason, it is necessary to attach a polarizing plate to each of the liquid crystal cells divided by the scriber, and the workability is very poor.
In addition, various measures such as ensuring positioning accuracy and adhesion strength during bonding, preventing bubbles and dust from being mixed, and preventing the generation of static electricity are required, and in the subsequent process, the adhesion between the polarizing plate and the panel is strengthened or remains between the panels. A lot of time and effort has been spent on assembling such as performing autoclave processing to remove air bubbles.
[0003]
In order to solve this problem, the present applicant uses an aqueous solution of a dichroic dye developed by Optiva in the United States as ink, and prints this ink directly on a glass or plastic substrate with a normal flexographic printing apparatus to form a polarizing film. We have developed a manufacturing technology and applied for it earlier. This technology has made it possible to assemble a liquid crystal cell that does not require the work of attaching a polarizing plate, and has greatly increased the production efficiency of LCDs.
[0004]
Since the polarizing film plays an important role in visualizing the change in the orientation of the liquid crystal due to the electric field, the polarizing film has a large effect on the display characteristics of the LCD.
However, in the process of printing and applying the above ink liquid, uneven printing in the application direction occurs due to lack of fine adjustment technology for fine feeding of the printing table, slippage of the surface, etc. May cause printing unevenness in the thickness direction.
These printing irregularities appear as appearance defects, and have a problem of deteriorating the display characteristics of the LCD.
[0005]
Therefore, an object of the present invention is to minimize the printing unevenness that occurs when a polarizing film is formed by printing and applying an ink liquid of a dichroic dye so that good LCD display characteristics can be obtained. Things.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the present invention is configured as follows.
[0007]
That is, the polarizing film manufacturing apparatus of the present invention applies a dichroic dye ink liquid to a plate fixed to a plate cylinder to form a thin film, and transfers and applies the thin film from the plate to a substrate to form a polarizing film. In this, both ends of the shaft of the plate cylinder are loosely fitted to a horizontally movable bearing, and the plate cylinder is placed on a substrate, and the bearing is horizontally moved along a printing direction. The above object is achieved by rolling the cylinder to transfer and apply a thin film of the ink liquid from the plate to the substrate.
[0008]
Further, the polarizing film manufacturing apparatus of the present invention is characterized in that the bearing is a vertical groove, and both ends of the shaft are dropped into this groove to support the plate cylinder.
[0009]
The apparatus for manufacturing a polarizing film according to the present invention is characterized in that weights are attached to both sides of the axis of the plate cylinder to adjust the pressure of the plate.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 shows a schematic view of a polarizing film manufacturing apparatus embodying the present invention.
In the polarizing film manufacturing apparatus, bearings 2 and 2 are erected on both sides of the table 1, and longitudinal grooves 3 and 3 are provided in the bearings 2 and 2 so that both ends of the shaft 5 of the plate cylinder 4 are dropped. The shaft 5 of the plate cylinder 4 is loosely fitted to the bearings 2 and 2.
The bearings 2 and 2 are configured to be horizontally movable and connected to horizontal moving means (not shown).
In addition, weights 6, 6 of equal weight are attached to both sides of the shaft 5 of the plate cylinder 4.
[0012]
The polarizing film manufacturing apparatus embodying the present invention is configured as described above. When manufacturing a polarizing film, a substrate 7 is placed on a table 1 as shown in FIG. The plate 8 having the groove a is attached and mounted on the substrate 7.
At this time, forces acting between the plate 8 and the substrate 7 are adjusted by the weights 6 attached to both sides of the shaft 5 of the plate cylinder 4.
Then, an ink liquid of a dichroic dye is applied to the plate 8 to form a thin film of the ink liquid on the plate surface, and the bearings 2 and 2 are horizontally moved along the printing direction.
Thereby, the plate cylinder 4 rolls on the substrate 7, and a thin film of the ink liquid is transferred and applied from the plate 8 to the substrate 7.
At this time, a shearing force is applied to the stick-shaped supramolecular complex contained in the ink liquid in the small gap between the fine groove a of the plate 8 and the substrate 7, and the stick-shaped supramolecular composite is aligned on the substrate 7.
Therefore, the thin film of the ink liquid transferred and applied to the substrate 7 has polarization performance.
The film thickness at this time is controlled by the cross-sectional shape of the plate 8 and the weight of the weight 6.
[0013]
FIG. 3 shows an example of the fine groove.
FIG. 3A shows a stripe-shaped fine groove a, which is suitable for low-speed transfer coating.
FIG. 3B shows a fine groove a of a wavy stripe type, which is suitable for high-speed transfer coating.
FIG. 3 (c) shows a raindrop-shaped stripe-shaped fine groove a, which is also suitable for the case of high-speed transfer coating.
With these fine grooves a, the stick-shaped supramolecular complex contained in the ink liquid sandwiched between the fine grooves a and the substrate 7 is oriented in a certain direction.
[0014]
【The invention's effect】
As described above, the polarizing film manufacturing apparatus of the present invention transfers the thin film of the ink liquid from the plate to the substrate by rolling the plate cylinder.
Therefore, according to the present invention, the plate cylinder rotates spontaneously due to the friction between the substrate and the plate, and the rotation of the plate cylinder becomes smooth, so that printing unevenness in the application direction is reduced.
In addition, since the plate cylinder rolls on the substrate to perform printing, the plate is kept at a constant pressure by absorbing warpage and undulation of the substrate and unevenness on the surface, and printing unevenness in the thickness direction is reduced.
In addition, complicated mechanisms and adjustments such as rack gears for synchronizing the movement of the table and the plate cylinder are not required, and the apparatus is simplified.
[0015]
Further, in the polarizing film manufacturing apparatus of the present invention, both ends of the shaft are dropped into the longitudinal grooves to support the plate cylinder.
Therefore, according to the present invention, since the plate cylinder can be easily removed, the plate cylinder can be replaced each time printing is performed, and the plate can be easily washed and dried during the printing.
[0016]
Further, the polarizing film manufacturing apparatus of the present invention adjusts the pressure of the plate by attaching weights on both sides of the axis of the plate cylinder.
Therefore, according to the present invention, since the pressure of the plate can be adjusted only by changing the weight, the control of the film thickness during printing is simplified.
[Brief description of the drawings]
FIG. 1 is a schematic view of a polarizing film manufacturing apparatus embodying the present invention.
FIG. 2 is a schematic view of manufacturing a polarizing film embodying the present invention.
FIG. 3 is a diagram showing an example of a fine groove.
[Explanation of symbols]
1 Table 2 Bearing 3 Groove 4 Plate cylinder 5 Shaft 6 Weight 7 Substrate 8 Plate a Fine groove

Claims (3)

A dichroic dye ink solution is applied to the plate fixed to the plate cylinder to form a thin film,
Transferring and applying this thin film from a plate to a substrate to produce a polarizing film,
While both ends of the shaft of the plate cylinder are loosely fitted to a horizontally movable bearing,
Place this plate cylinder on the substrate,
Then the bearing is moved horizontally along the printing direction,
An apparatus for manufacturing a polarizing film, wherein the plate cylinder is rolled to transfer and apply a thin film of ink liquid from the plate to a substrate. The bearing is a longitudinal groove,
The polarizing film manufacturing apparatus according to claim 1, wherein both ends of the shaft are dropped into the groove to support the plate cylinder. The polarizing film manufacturing apparatus according to claim 1, wherein weights are attached to both sides of the axis of the plate cylinder to adjust the pressure of the plate.

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