KR100357949B1 - Manufacturing method for PLCD - Google Patents

Abstract

OBJECTIVE: A method of manufacturing a plastic liquid crystal display device including marking a mark on both ends of a substrate in a stick scribe process by correcting the numerical value of each stick according to the degree of deformation, and cutting a part of the cell cutting portion before assembly. offer

Method: Before the assembly of the upper panel and the lower panel, the step (100) of cutting the upper panel of the part corresponding to the boundary between the screen display unit of each cell and the lower substrate pad of the cell on a line, and assembling the upper and lower panels, Forming a distance measuring mark at both ends, and measuring the amount of thermal expansion generated during assembly of the upper and lower panels by the displacement of the mark to correct the scribe of the stick by the corresponding displacement, and then scribing the stick ( 300, and cutting the stick in units of cells (400).

Effect: In the stick scribing process of plastic substrates that are easily deformed by heat, accurate scribing process can be performed in consideration of the deformation amount, and the half cutting part is cut before assembly, so that the process can be performed without fear of disconnecting the patterned ITO. Therefore, the difficulty of the process can be eliminated.

Description

Manufacturing method of plastic liquid crystal display device {Manufacturing method for PLCD}

The present invention relates to a method of manufacturing a plastic liquid crystal display device, and more particularly, to a process of drawing gold and breaking it into a product on a plastic substrate which is expanded and compressed during the heat treatment to generate a change.

The liquid crystal display device has a regular molecular arrangement such as a liquid crystal along with liquidity of liquid, and has an optical anisotropy. When a voltage is applied, the liquid crystal display device uses a property of a liquid crystal having a characteristic of changing the molecular arrangement along the direction of an electric field. It is a device for flat panel display.

The liquid crystal display device generally uses glass or plastic as the substrate material, and the plastic liquid crystal display device is a liquid crystal display device using a flexible and light plastic as a substrate through which the liquid crystal described above can receive an electrical signal.

Referring to the process of manufacturing the plastic liquid crystal display device schematically.

After selecting and cleaning the plastic panel coated with a transparent electrode, a photosensitive film is coated on the plastic panel. The photoresist film is cured by heat treatment at an appropriate temperature, and then undergoes an exposure step of irradiating ultraviolet rays to a transparent electrode using a chrome mask to recognize a pattern on the photoresist film, and then removing the photoresist area removed in the exposure step. .

The ITO pattern is etched using an etching solution, and after removing the photoresist on the ITO pattern, an insulating film is formed. Polyimide is formed on the plastic panel on which the insulating film is formed, and the alignment film is printed and aligned with a rubbing cloth. The sealant is printed on the panel made of the above process and subjected to a short printing process of printing a conductive adhesive. The two panels described above are assembled, divided into sticks, liquid crystal is injected and sealed, and then cut into cell units for product formation, followed by an inspection process, and then a polarizing plate is attached.

The above-described process is a schematic process for manufacturing a plastic liquid crystal display device, and the process of dividing the assembled panel with a stick and cutting the cell into a cell is different from that of a liquid crystal display device employing a glass substrate.

As shown in FIG. 5, a plurality of liquid crystal cells 6 formed by assembling the upper and lower substrates and printing the sealant 4 are formed in the plastic liquid crystal display panel 2 assembled before the liquid crystal is injected. In order to inject the liquid crystal into the liquid crystal cell 6, the gold is first cut out to be peeled off with each stick, and then the liquid crystal is injected, and once again cut into cell units to form a product.

In the case of a liquid crystal display device formed of a glass substrate, the thermal expansion rate is small, so that even if the stick is divided into sticks according to the initial design value, a large error does not occur. In such a case, a problem arises in that the cut should be made in consideration of the deformed amount rather than the cut by a predetermined value.

In addition, after sealing after the injection of the liquid crystal is cut in each liquid crystal cell unit for production. When cutting as described above, only a part of the upper plate may be cut without simultaneously cutting the upper and lower substrates. Such cutting is called half cutting, and the half cut state is shown in FIG.

In the drawing, the upper and lower substrates 10 and 10 'made of plastic are bonded to each other, and the transparent electrode 8 is patterned on the substrate 10' attached to the bottom surface. Half cutting is to cut only a part of the upper substrate 10.

In the case of a substrate employing glass, a method of crushing and crushing a bar is used. However, in the case of plastic, the method is not easy to apply due to the material properties.

In addition, an ITO transparent electrode 8 is deposited on the lower substrate surface 10 ′ which should not be cut. Due to the thermal properties of the plastic, the hardness of the ITO deposited on the plastic substrate is weak, which may cause disconnection of the ITO during cutting. many.

The present invention has been made in order to solve the above-mentioned problems of the prior art and work by correcting the numerical value of each stick according to the degree of deformation by marking marks on both ends of the substrate during the stick scribe process, and before the assembly of the cell cut portion It is an object of the present invention to provide a method for manufacturing a plastic liquid crystal display device including cutting a part thereof.

To this end, the present invention provides a method for manufacturing a plastic liquid crystal display device, comprising: assembling the upper and lower panels in which a plurality of liquid crystal cells are imaged, and cutting them in units of cells to form a liquid crystal cell. The step of cutting the upper panel of the part corresponding to the boundary between the screen display unit of each cell and the lower substrate pad of the cell on the line before the assembly of the upper panel, the lower panel, the assembly of the upper panel and the lower panel, Forming a mark for distance measurement on the substrate, measuring the amount of thermal expansion generated during assembly of the upper and lower panels with the displacement of the mark, correcting the scribe of the stick by the displacement, and then scribing the stick; It is a step of cutting in units of cells.

When the plastic liquid crystal display device is manufactured by the above-described method, it is possible to prevent cutting that does not take into account the amount of deformation of the substrate due to the thermal properties of the plastic during the stick scribing process, and by cutting the half cut portion of the upper substrate before assembly, When cutting, half cutting is performed at the same time so that there is no fear of disconnection of the ITO of the pad part.

1 is a flowchart illustrating a method of manufacturing a plastic liquid crystal display device according to the present invention.

2 is a view showing a plastic substrate during the stick scribe process to which the present invention is applied.

Figure 3 is a view showing a substrate cut through the cut half of the assembly in the manufacturing method of the present invention.

Figure 4 is a view showing a substrate for cutting in units of cells of the manufacturing method of the present invention.

FIG. 5 illustrates an assembled liquid crystal display panel. FIG.

6 is a diagram illustrating half cutting of a liquid crystal display panel.

** Description of symbols for the main parts of the drawing **

2: plastic liquid crystal display panel 2a, 2b, 2c: stick

4: sealant 6: liquid crystal cell

10,10 ': substrate 18: half cut portion

EMBODIMENT OF THE INVENTION The structure of this invention is demonstrated in detail with reference to attached drawing. For reference, prior to the description of the present invention will be referred to the same reference numerals as for the parts corresponding to the conventional drawings.

First, FIG. 1 is a flowchart showing a procedure relating to a method of manufacturing a plastic liquid crystal display device according to the present invention.

The method applied to the manufacture of the plastic liquid crystal display device according to the present invention is as follows.

In the first step 100, before the upper and lower panels, in which the transparent electrode is patterned and the sealant is applied to form the liquid crystal injection space, are assembled, the outer edge of the sealant and the lower substrate of the upper substrate can be pulled out from the pad portion of the lower substrate. Cut the boundary of the pad portion in the line shape.

In the second step 200, after assembling, the liquid crystal is injected to form identification marks for distance measurement at predetermined portions of both ends of the plastic substrate on which the plurality of liquid crystal cells are formed.

In the third step 300, the stick is scribed by checking the mark of the expanded plastic substrate through the heat treatment process and correcting the stick scribe position by the expanded displacement.

In the fourth step 400, each stick is cut in units of cells.

The stick scribing process and the half-cutting process of the plastic liquid crystal display device manufacturing method comprising the above steps will be described.

Figure 2 shows a plastic substrate for scribing the stick in the method of manufacturing a plastic liquid crystal display device according to the present invention.

Since the plastic substrate is easily deformed by heat due to the characteristics of the substrate adopting the plastic, the substrate is expanded when the heat treatment process is completed after assembly. Accordingly, if the substrate is scribed to the numerical value set for the stick scribing process, it may not be an accurate scribing process without considering the expanded portion.

In the present invention, as shown in the drawings, the identification marks are engraved on both ends of the plastic substrate so that the amount of expansion of the substrate can be measured before and after the heat treatment process. Based on the measured value, the correction amount is determined according to the number of sticks, and if the stick is scribed, accurate scribing and cutting can be performed.

Referring to FIG. 2, the plastic liquid crystal display panel 2 has three sticks 2a, 2b, and 2c formed therein, and the portion represented by the dotted line 12 is a portion initially set to scribe the stick. . Identification marks 14 for checking the amount of deformation of the panel are formed at predetermined portions at both ends of the plastic liquid crystal display panel 2.

After the heat treatment of the plastic liquid crystal display panel 2, the mark 14 was measured to expand 3 mm. Accordingly, when scribing the panel 2 with a stick, each stick (2a) (2b) (2c) is extended by a 1 mm expression from the initial setting value, and the scribed portion represented by the solid line (16) can be used to perform an accurate scribing process. It can be.

3 and 4 show the half cutting process.

Figure 3 shows the front of the lower substrate 10 'before being assembled, the lower substrate is a substrate that must be half cut in conventional cell cutting. Before assembling the substrate 10 ′, the half cut portion 18 is cut in advance as shown in the drawing. After assembling the substrate 10 ′ with the upper substrate 10 that will not be cut in half, the stick scribe process is performed by the above-described method.

4 shows a stick cut by a stick scribe process.

The stick 2b as described above is cut in units of cells to form a product. The cell cuts along the dotted line 20 in the drawing, and thus the half cut is naturally made when the cut is performed.

If the half cut in the above manner in advance, there is no fear of disconnection of ITO, which is weak when the hardness is deposited, and the process can be easily performed.

In the stick scribing process of plastic substrates that are easily deformed by heat, accurate scribing process can be performed in consideration of the deformation amount, and by cutting the half-cutting area before assembly, the process is performed without fear of disconnecting the patterned ITO. Can solve the difficulty of.

Claims (1)

In the method of manufacturing a plastic liquid crystal display device of assembling the upper and lower panels in which a plurality of liquid crystal cells are imaged, and cutting them by each cell unit to form a liquid crystal cell, Cutting the upper panel of a portion corresponding to the boundary between the screen display unit of each cell and the lower substrate pad of the cell onto a line such that the electrode terminal can be pulled out from the pad unit of the lower substrate before the assembly of the upper and lower panels; Assembling the upper and lower panels, forming an identification mark for distance measurement at predetermined locations on both ends of the substrate, and measuring the amount of thermal expansion generated during assembly of the upper and lower panels by the displacement of the mark, the scribe of the stick And scribing the stick after correction, and cutting the stick in units of cells.