KR20100128076A

KR20100128076A - Method for manufacturing light guide plate

Info

Publication number: KR20100128076A
Application number: KR1020090046517A
Authority: KR
Inventors: 이세규
Original assignee: 이세규
Priority date: 2009-05-27
Filing date: 2009-05-27
Publication date: 2010-12-07

Abstract

PURPOSE: A method for manufacturing a light guiding plate is provided to use atmospheric pressure plasma and activates a surface of a transparent member, thereby the attachment characteristic of a dot pattern is excellent. CONSTITUTION: A transparent substrate is loaded(S100). A protective film is peeled(S200). By processing the transparent surface and activating it(S300). By using the UV hardening type paint on a surface of the transparent member, which surface is activated, forms a light guiding pattern(S400).

Description

Light guide plate manufacturing method {METHOD FOR MANUFACTURING LIGHT GUIDE PLATE}

The present invention relates to a light guide plate manufacturing method, and more particularly, to a light guide plate manufacturing method for forming a light guide pattern by the inkjet printing method.

Liquid Crystal Display is different from cathode ray tube, plasma display panel and field emission display. In order to visually represent an image, a light source is required. In such a liquid crystal display, a backlight unit is installed on a lower surface of the liquid crystal layer to irradiate a back surface of the liquid crystal layer.

In other words, the backlight unit is a device for uniformly irradiating the information display surface for use in a dark place to compensate for the disadvantage of being unable to use in a dark place. Therefore, the brightest light should be made with the minimum power.

In the backlight unit, various light sources are used. In general, fluorescent lamps such as CCFL and EEFL are commonly used. Recently, a technology using light emitting diodes (LEDs) has been developed, and the range of their use is gradually increasing. .

In the case of using the LED as a light source, generally, as shown in FIG. , 60), and a mold frame (not shown) for tying each of these parts into one unit.

Here, the light guide plate 10 is an optical material that guides the light flowing from the LED 20 attached to its side to the front side. In fact, the light path should have a change in medium. However, since there is no change in the light path inside the light guide plate 10, a dot pattern 12 different from the light guide plate forming material is printed on the surface of the light guide plate 10.

That is, the light guide plate 10 is formed by forming a dot pattern 12 on the lower surface of the light guide plate 10 using various methods. The dot pattern 12 contains very small glass beads and small grains. Therefore, most of the light introduced into the light guide plate 10 is scattered by the grains, and the light scattered by the grains is passed through the upper surface of the light guide plate 10 to the panel and eventually sensed by the user's naked eye.

In this case, only the light guide plate 10 on which the dot pattern 12 is formed is directly scattered, and thus the shape of the dot pattern 12 formed on the light guide plate 10 is reflected. The dot pattern 12 is a level that can be clearly detected even after the panel is mounted on the wick. In the related art, a process of minimizing or removing the reflection of the dot pattern is required, and the diffusion plate 40 may be used. The light luminance passing through the diffuser plate 40 rapidly decreases as diffusion occurs in both the horizontal and vertical directions perpendicular to the plane. The prism sheet is used to refocus this light to increase the light brightness, and generally two horizontal prism sheets 50 and 60 are used.

Of the components of the backlight unit, the light guide plate 10 changes a point light source emitted from the LED 20 to a surface light source, and its role is very important, and the dot pattern 12 is formed on the light guide plate 10. Technology is also known as the most difficult and complicated technology of the backlight unit manufacturing process.

As the method of forming the dot pattern 12 on the light guide plate 10, a method of fixing the light scattering ink by screen printing the injected light guide plate, or directly processing the pattern on the light guide plate is used. However, such a method has a disadvantage in that productivity is reduced due to an additional process generated after injection and it is difficult to form a fine pattern. In addition, recently, a method of injecting a light guide plate by mounting a stamper having an uneven surface formed on a mold has been used, but this also has a problem in that it takes too much cost to form a fine mold.

Therefore, there is an urgent need for the development of a technology capable of manufacturing an excellent light guide plate without requiring expensive costs. In particular, as the light guide plate becomes larger in area, this demand is further increased.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a light guide plate manufacturing method which is suitable for manufacturing a large area light guide plate using inkjet printing technology and has excellent adhesion of a dot pattern after the production.

The light guide plate manufacturing method according to the present invention for achieving the above technical problem, 1) the step of activating the surface by spraying plasma on the surface of the transparent plate; 2) forming a light guide pattern using a UV curable paint on the surface of the transparent sheet having the surface activated; 3) irradiating and curing UV light guide patterns formed on the surface of the transparent plate.

In the step 1) in the present invention, the plasma is injected from the fixed position to the upper side to the downward direction, the transparent plate is horizontally moved in one direction, passing through the plasma injection point, the entire surface of the transparent plate material is activated sequentially It is done.

And the step of peeling off the protective film attached to the surface of the transparent plate before the step 1) may be further proceeded. In this step, it is preferable that the fixed peeling module catches one end of the protective film, and the protective film is sequentially peeled off while the transparent plate is horizontally moved in one direction.

In the step 2) of the present invention, the light guide pattern is formed by using an inkjet printing method.

In the present invention, after the step 3), it is preferable that the inspection step of inspecting the formed light guide pattern is further performed.

After the inspection step, the step of attaching a protective film on the surface on which the light guide pattern is formed may be further proceeded.

According to the present invention, since the dot pattern is formed by using an inkjet printing method, the dot pattern can be formed very precisely and easily even in a large area light guide plate, and the surface of the transparent plate is activated by using an atmospheric pressure plasma, so that the dot pattern is attached. This has a very good advantage.

Hereinafter, with reference to the accompanying drawings will be described in detail a specific embodiment of the present invention.

In the light guide plate manufacturing method according to the present embodiment, first, a step (S100) of loading a transparent plate is performed. The transparent plate is prepared in a state where a plurality of transparent plates are placed on the cassette or the transparent plate mounting table. In this step (S100) it is supplied to the position where the surface treatment step will proceed at a predetermined time interval the transparent plate material stacked.

Next, a step (S200) of peeling off the protective film is performed. Since the transparent plate is a material having excellent permeability, defects occur when foreign matter is attached to the surface or damage occurs on the surface. Therefore, a protective film is attached to the surface of the transparent plate 114 to prevent this. This protective film should be removed before the surface treatment process begins. In this step (S200), the protective film is peeled off from the transparent plate.

Specifically, in the step (S200), it is preferable that the fixed release module catches one end of the protective film, and the protective film is sequentially peeled off while the transparent plate moves horizontally in one direction.

Of course, the protective film peeling step (S200) may be performed before the transparent plate loading step, or may be omitted when the protective film is not attached to the transparent plate.

Next, a step (S300) of processing and activating the transparent plate surface is performed. In this step (S300), it is preferable that the plasma is sprayed from the fixed position to the upper side to the lower direction, and the transparent plate is horizontally moved in one direction to pass through the plasma spraying point, the entire surface of the transparent plate is preferably activated sequentially. . That is, the surface treatment proceeds sequentially by the plasma while the transparent plate is horizontally moved to the lower portion of the plasma spraying unit for generating and spraying plasma in a long line shape.

When the plasma spraying part is fixed and the surface treatment proceeds while the transparent plate moves horizontally, the surface treatment takes a very short time, and this surface treatment process has an advantage that it hardly affects the entire process time.

Next, a step (S400) of forming a light guide pattern using a UV curable paint on the surface of the transparent plate having the surface activated is performed. In the present embodiment, the light guide pattern is formed on the surface of the transparent plate using an inkjet printing method. Accordingly, the light guide pattern can be formed very precisely even on a large area transparent plate by a simple method. Specifically, the light guide pattern may be formed on the transparent plate while horizontally moving in a state where a plurality of ink ejection heads are arranged in a line.

Next, the step (S500) of curing the light guide pattern formed on the surface of the transparent plate by irradiating UV. In this step (S500), a general UV lamp is irradiated onto the transparent plate, and the transparent plate is horizontally moved to harden the entire transparent plate.

Next, an inspection step S600 of inspecting the formed light guide pattern may be further performed. The inspection step S600 may be omitted, and a specific inspection method may inspect a light guide pattern formed on a transparent plate using a vision camera.

Next, the step of attaching the protective film (S800) may be carried out. This step (S800) is a step of attaching a protective film to the surface on which the light guide pattern is formed after the inspection step (S600). The light guide pattern formed on the transparent plate has a very sophisticated optical structure. Therefore, this light guide pattern must not be damaged or contaminated during handling. Therefore, immediately after production, a protective film is attached to protect it.

Of course, the protective film attaching step (S800) may be carried out after the transparent plate unloading step (S700) to be described later.

Finally, the step S700 of unloading the substrate is performed. In this step (S700) is to discharge or package the finished light guide plate to the outside.

1 is a cross-sectional view showing the structure of a backlight unit.

2 is a flowchart illustrating a process of a light guide plate manufacturing method according to an embodiment of the present invention.

Claims

1) spraying plasma on the surface of the transparent plate to activate the surface;

2) forming a light guide pattern using a UV curable paint on the surface of the transparent sheet having the surface activated;

And 3) irradiating and curing UV light guide patterns formed on the surface of the transparent plate.

The method of claim 1, wherein step 1) comprises:

The plasma is sprayed from the fixed position to the upper side to the lower direction, and the transparent plate member is horizontally moved in one direction to pass through the plasma injection point, the entire surface of the transparent plate member is activated sequentially.

The method of claim 1,

The method of manufacturing a light guide plate further comprising the step of peeling off the protective film attached to the surface of the transparent plate before the step 1).

The method of claim 3,

A method of manufacturing a light guide plate, characterized in that the peeling module in a fixed state catches one end of the protective film and the protective film is sequentially peeled off while the transparent plate is horizontally moved in one direction.

The method of claim 1,

In the step 2), the light guide plate manufacturing method, characterized in that for forming the light guide pattern using an inkjet printing method.

The method of claim 1,

After the step 3), the light guide plate manufacturing method characterized in that the further inspection step for inspecting the formed light guide pattern.

The method of claim 6,

After the inspection step proceeds, the step of attaching a protective film on the surface on which the light guide pattern is formed further comprising a light guide plate manufacturing method.