KR20040026358A - Producing method for stamper for light quide panel - Google Patents

Abstract

PURPOSE: A method of manufacturing a stamper used for fabricating a light guide is provided to record a fine pattern using a laser to reduce the manufacturing costs. CONSTITUTION: A glass(510) is mounted on a turntable(310) and a photosensitive resin(520) is coated on the glass using a needle while the glass and turntable are rotated. An image file(450) of a pattern to be input is controlled in a manner that a laser(530) is on/off using a signal control computer(460) to record image data of the image file in the photosensitive resin. The photosensitive resin exposed by a laser is developed. A pattern is etched in the glass using ion etching. The photosensitive resin is removed. A metal glass is formed on the glass and stripped to obtain a stamper.

Description

Producing method for stamper for light quide panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of stampers for manufacturing light guide plates, and more particularly, to a method of manufacturing stampers for manufacturing light guide plates, which can improve the quality of products while lowering manufacturing costs by recording fine patterns using lasers.

In liquid crystal display (LCD), characters are clearly visible because the light blocking part and the transmitting part are made clear in bright places with high illuminance, but the characters are difficult to distinguish in dark places with low illumination. There is a characteristic. Therefore, the liquid crystal display device has a structure in which a backlight unit (BLU, Back Light Unit) is installed on the rear side of the liquid crystal display device in consideration of visibility so that the screen display state can be visually clearly recognized like a cathode ray tube even in a place without an external light source. Is made of.

FIG. 1 is an exploded structure diagram of a general liquid crystal display device. As shown in FIG. 1, a general liquid crystal display device includes a fluorescent lamp 190 positioned at a side of a light source and displays light emitted from the fluorescent lamp 190. The light is incident on the light guide plate 130 to reflect the light to the panel 180, and a reflective sheet 120 and a case 110 are formed at the lower end of the light guide plate 130, and the reflective sheet 120 reflects the lost light. It minimizes the loss of light, and has a primary diffusion sheet 140 for diffusing light incident on the LCD panel 180 at the top of the light guide plate 130, vertical and horizontal prism sheet for condensing the diffused light ( 150 and 160, and a second diffusion sheet 170 is disposed at an upper end of the prism sheet 160 to diffuse light emitted from the prism sheet 160 at a predetermined angle. The LCD panel 180 is formed on the top of the structure 170 Eojinda.

As described above, the light guide plate plays a very important role in the liquid crystal display device. There are various methods for manufacturing the light guide plate.

In the printing method, the light scattering ink is screen-printed on the lower part of the light guide plate to vertically scatter incident light and emit light.

However, the printing method has a problem of stability at light efficiency, high temperature, and high humidity, and also has a problem in that production efficiency is very low due to the inconvenience of having to perform the printing operation again after molding the light guide plate.

In the case of the non-printing method, many manufacturing methods have been researched and developed, and the most representative method is an etching method.

The etching method is a method of applying a photoresist, attaching and exposing a pattern film, and then developing and chemically etching the photoresist.

However, the etching method is easy to implement a pattern, but difficult to control the etching concentration and reaction time during the same pattern, there is a problem in the reproducibility, and also there is a problem in the transferability to form the pattern surface to the desired standard.

Representative methods for manufacturing a light guide plate having improved light efficiency of the light guide plate include a sand blast method, a V-cut method, a stamper method, and the like.

However, the sand blast method has a disadvantage in that the brightness distribution is easily changed according to the change of the injection conditions. The V-cut method has excellent light efficiency and excellent reproducibility, but has a washing process and a long working time for mass production. In the case of the stamper method, the light efficiency is good and the injection property is good, but the density control of the pattern is controlled by the change of the interval, so that partial modification is difficult and the pattern is molded in a linear shape, thereby having a problem in pattern uniformity.

Among the above methods, a method of manufacturing a stamper used in a stamper method will be described in detail.

The conventional stamper-type light guide plate manufacturing process is as shown in Figures 2a to 2g.

First, as shown in FIG. 2A, the photoresist 220 is coated on the glass 210, and then the photomask 230 in which the pattern is recorded is shown in FIG. 2B. (220) is mounted on. After mounting the photomask 230 on the photoresist 220, as shown in Figure 2c is irradiated with ultraviolet light 240 to record the pattern. Subsequently, as shown in FIG. 2D, the developing process is performed. As shown in FIG. 2E, the charging film 250 is formed, and then the metal glass 260 is subjected to the electroplating process as shown in FIG. 2F. Are made and peeled as shown in FIG. 2G to obtain a stamper 270.

However, the conventional stamper-type light guide plate manufacturing process has a problem of performing a separate operation in order to manufacture the photomask 230, the price of the general photomask 230 is a high price of several hundred to tens of thousands of won, In addition, there is a problem in that a deviation occurs because the width of the pattern on the photomask 230 and the width of the photoresist 220 after development do not match, and the photoresist (photo lithography) is used to perform the operation. The reproducibility is easily changed by the composition and the sensitivity of the 220.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and to provide a manufacturing method of a light guide plate manufacturing stamper which can improve and refine the product quality while lowering the manufacturing cost by recording a fine pattern using a laser. There is.

1 is an exploded structure diagram of a general liquid crystal display device.

2A to 2G are general process diagrams of a manufacturing method of a stamper for manufacturing a light guide plate according to the related art.

Figure 3 is a photosensitive resin coating process of the manufacturing method of the stamper for manufacturing a light guide plate according to an embodiment of the present invention.

4 is a fine pattern recording process diagram of a method of manufacturing a light guide plate manufacturing stamper according to an embodiment of the present invention.

5A to 5F are overall process diagrams of a method of manufacturing a light guide plate manufacturing stamper according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

510 glass 520 photoresist

530: laser 550: stamper

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the object, operation, and effect of the present invention will become more apparent from the description of the preferred embodiment.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment Rather, various changes, additions, and changes are possible within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

The configuration of the manufacturing method of a light guide plate manufacturing stamper according to an embodiment of the present invention, as shown in Figs. 3 and 4 and 5a to 5f, the glass 510 is mounted on the turntable 310 and then the turntable Applying the photoresist 520 on the glass 510 using the needle 330 while rotating together with the 310, and a signal control computer 460 for the image file 450 of the pattern to be input. Recording the image data in the image file 450 to the photoresist 520 by controlling the laser 530 in an on / off manner, and exposing by the laser 440. Removing the photosensitive resin 520 by a developing process, etching a pattern on the glass 510 by an ion etching method, and performing a washing process to remove the photosensitive resin 520 and perform a pole casting process. Step, peeling off the glass 510, the light guide plate stamper 550 ) Is obtained.

The process of the manufacturing method of the stamper for manufacturing the light guide plate according to the embodiment of the present invention by the above configuration is as follows.

First, as shown in FIG. 5A, the photosensitive resin 520 is coated on the glass 510. In the exemplary embodiment of the present invention, the original plate is illustrated as the glass 510, but is not necessarily limited to the glass 510. As another example, silicon or a metal material may be used.

In the method of applying the photoresist 520 on the glass 510, as shown in FIG. 3, the glass 510 is mounted on the turntable 310 and then rotated together with the turntable 310. The photosensitive resin 520 is coated on the glass 510 by using a needle 330. In this case, the turntable 310 is rotated at a high speed from a low speed rotation, so that the photoresist 520 of the photoresist 520 is coated. A uniform thickness deviation is obtained. The thickness of the photosensitive resin 520 obtained in this way is 300-3000 or more. The selection of the thickness of the photoresist 520 is dependent on the laser wavelength used for recording the fine pattern. The krypton laser has a wavelength of 413 nm, and the photoresist 520 is most suitable for the recording of the krypton laser. The thickness of about 1,000 ~ 1,800. In the exemplary embodiment of the present invention, the thickness of the photosensitive resin 520 is exemplified as 1000 to 1800. However, the thickness of the photoresist 520 is not limited to 1000 to 1800, but may be used up to several hundreds to tens of thousands depending on the intensity and working distance of the laser.

Next, as shown in FIG. 5B, the fine pattern is recorded using the laser 530. As such, when the fine pattern is recorded by using the laser 530, a rotation method is used.

The recording of the fine pattern is performed by turning on / off the laser 530 using the signal control computer 460 with the image file 450 of the pattern to be input as shown in FIG. By controlling, the signal control computer 460 writes the image data in the image file 450 to the photoresist 520 by repeating the control of the laser 530.

Thus, the photosensitive resin 520 exposed by the laser 440 is removed by a developing process. In the developing process, the photoresist 520 of the portion irradiated with the laser 440 is removed to obtain the etching efficiency and the uniformity of the etching surface during etching.

As shown in FIG. 5C, the glass 510 in which the developing process is completed is etched into the glass 510 by a pattern of 5 μm in length and 5 μm in depth by 5 nm in an ion etching method.

The quality of the light guide plate stamper varies according to the uniformity and angle of the surface of the glass 510 to be etched. The uniformity of the surface of the glass 510 obtained in this case is about 3%, and the difference of the angle which can be obtained has the range of 45-135.

The glass 510 which has been etched is removed by performing a washing process as shown in FIG. 5D to remove the photoresist 520 and performing a pole casting process as shown in FIG. 5E. The above electroforming step is controlled by the hydrogen ion concentration (pH) and current density of the electroforming solution. After the electroplating process is completed, as shown in FIG. 5F, when the glass 510 is peeled off, the stamper 550 for the light guide plate is obtained.

As described in the above embodiments, the present invention has the effect of improving the quality of the product by improving the quality of the product while lowering the manufacturing cost by recording the fine pattern using a laser.

Claims (2)

Mounting the glass 510 on the turntable 310 and applying the photoresist 520 on the glass 510 using the needle 330 while rotating together with the turntable 310; By controlling the image file 450 of the pattern to be input in a manner of turning on / off the laser 530 by using the signal control computer 460, the image data in the image file 450 can be controlled. Recording at 520), Removing the photosensitive resin 520 exposed by the laser 440 by a developing process; Etching the pattern on the glass 510 by ion etching; Removing the photoresist 520 by performing a washing process and performing a pole casting process; Peeling off the glass (510) to obtain a light guide plate stamper (550) comprising the step of manufacturing a light guide plate manufacturing stamper characterized in that it comprises. The method of claim 1, wherein a rotation method is used when a fine pattern is recorded by using the laser (530).