KR20120014628A - Lcd module with structure for preventing light leakage and method for manufacturing the same - Google Patents

Abstract

PURPOSE: An LCD module having a light leakage prevention structure and a manufacturing method thereof are provided to minimize the leakage of light of a backlight unit to the side of a transparent LCD panel. CONSTITUTION: A color filter substrate(120) is arranged on a TFT(Thin Film Transistor) substrate(110). The color filter substrate includes a color filter. A lower polarizing plate(130) is arranged in the lower color filter substrate. An upper polarizing plate(132) is arranged in the upper color filter substrate. A light blocking layer(140) is arranged in the side of the color filter substrate.

Description

LCD module with structure for preventing light leakage and method for manufacturing the same}

The present invention relates to an LCD module and a method for manufacturing the same, and more particularly, to an LCD module and a method for manufacturing the same in the LCD module having a structure for preventing light leakage from the side of the LCD panel.

For modern people, mobile phones, PDAs, smart phones, and the like, have a terminal having a display function. Liquid crystal display modules (LCD modules) included in the terminal are roughly classified into small liquid crystal display modules mounted in mobile phones or digital cameras and large liquid crystal display modules used in monitors of TVs or computers.

The LCD module includes a LCD panel and a back light unit, and includes a mold frame for fixing and supporting them.

In this case, the LCD panel has a screen display area capable of displaying an image, and generally includes a color filter substrate, a thin film transistor (TFT) substrate, and a liquid crystal layer injected therebetween, and an upper surface of the color filter substrate. And a polarizing plate are disposed on the lower surface of the thin film transistor substrate.

In addition, the backlight unit may be divided into a direct type and an edge type. The direct type backlight unit is a method of irradiating light directly toward the LCD panel by arranging a light source on one side of the LCD panel, and an edge type by placing a line light source or a point light source on one side or a plurality of sides of the LCD panel. Light is guided to the LCD panel by Light Guide Panel.

Mobile phones, PDAs, and TVs in recent years often adopt edge type backlight units in consideration of the thickness of the display device. In detail with respect to the edge type backlight unit, the edge type backlight unit is laminated with a reflective sheet, a light guide plate and a diffusion sheet together with a lamp as a light source in a mold frame. Light emitted from the lamp is incident on the light guide plate and travels along the plate surface to reach the diffusion sheet disposed on the light guide plate. In addition, a part of the light that does not reach the diffusion sheet is reflected back from the reflection sheet disposed below the light guide plate to move to the light guide plate and the diffusion sheet. In this case, light may be uniformly diffused in the diffusion sheet and incident on the LCD panel.

In the conventional LCD module, the light emitted from the light source is not completely transmitted to the LCD panel through the light guide plate and the diffusion sheet, but a light leakage phenomenon in which a part of the light leaks may occur, thereby preventing light leakage such as light blocking tape. It has a structure.

However, the light leakage phenomenon cannot be completely prevented with a light shielding tape, and in particular, the LCD panel is transparent and light leaks between the mold frame and the LCD panel on the side of the backlight unit.

An object of the present invention is to provide an LCD panel having a light leakage preventing structure for minimizing the leakage of some light between the LCD panel and the mold frame disposed on the side thereof and a method of manufacturing the same.

LCD module having a light leakage prevention structure of the present invention for achieving the above object, a thin film transistor substrate which is a glass substrate including a thin film transistor (Thin Film Transistor); A color filter substrate disposed on the thin film transistor substrate in the same shape and being a glass substrate including a color filter; A lower polarizer and an upper polarizer disposed on a lower surface of the thin film transistor substrate and an upper surface of the color filter substrate, respectively, and transmit light in a specific direction; And a light blocking layer disposed on a side surface of the thin film transistor substrate and the color filter substrate and preventing light from leaking through the side surface.

In a preferred embodiment of the present invention, the light shielding layer may further include a light shielding layer on a part or the whole of the lower region of the thin film transistor substrate and the upper surface of the color filter substrate where the polarizer is not disposed.

The light blocking layer may be any one of a printing pigment, a film, and a coating layer capable of preventing the transmission of light.

According to another aspect of the present invention, there is provided a method of manufacturing an LCD module having a light leakage preventing structure, including a thin film transistor substrate, which is a glass substrate including a thin film transistor, and the same shape on the thin film transistor substrate. And a color filter substrate which is a glass substrate including a color filter, a lower polarizing plate and an upper portion disposed on a lower surface of the thin film transistor substrate and an upper surface of the color filter substrate, respectively, and transmitting light in a specific direction. A first step of preparing an LCD panel including a polarizing plate; A second step of forming a light shielding layer to prevent light leakage from a side surface formed by the thin film transistor substrate and the color filter substrate of the LCD panel prepared in the first step; A third step of preparing a backlight unit disposed under the lower polarizer of the LCD panel to irradiate light; Preparing a mold frame for accommodating and installing the LCD panel and the backlight unit; And a fifth step of assembling the LCD panel subjected to the second step and the backlight unit prepared in the third step to a mold frame.

In a preferred embodiment of the present invention, in the second step, the light shielding layer may be further formed on a part or all of an edge region of the lower surface of the thin film transistor substrate and the upper surface of the color filter substrate where no polarizer is disposed. have.

In the second step, the light shielding layer may be formed by any one of printing, film adhesion, and coating.

The printing may be pad printing or silk screen printing.

In addition, the pad printing, the first step of preparing a printing plate supplied with ink to the recessed portion corresponding to the light shielding layer; A second step of transferring the ink to a transcription pad which is an elastic body; And a third step of printing the light shielding layer on the LCD panel by the transfer pad to which the ink is transferred.

The ink may be a pigment that can prevent the transmission of light.

The pigment may be carbon black.

On the other hand, the film is attached, it may be made by using a separate adhesive or adhesive.

In addition, the coating may be made by applying a flowable synthetic resin.

According to the LCD module and the manufacturing method of the present invention, by providing a light shielding layer on the side of the transparent LCD panel, the light passing through the backlight unit can be minimized to leak to some transparent side.

1 is a side cross-sectional view showing the structure of an LCD module having a light leakage prevention structure according to an embodiment of the present invention.
2 is a flowchart sequentially illustrating a method of manufacturing an LCD module of the present invention.
3 is a process chart of the pad printing process applied to the manufacturing method of the LCD module of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below may be modified in various forms, and the scope of the present invention is not limited to the following embodiments. Embodiments of the present invention are provided to provide a thorough explanation to those skilled in the art.

First, the structure and structure of the LCD module having the light leakage preventing structure according to the embodiment of the present invention and the function and principle of the light shielding layer applied thereto will be described, and then the light shielding applied to the manufacturing method of the LCD module according to the embodiment of the present invention. The method of forming the layer will be described.

1 is a side cross-sectional view showing the structure of an LCD module having a light leakage prevention structure according to an embodiment of the present invention.

According to FIG. 1, an LCD module having a light leakage preventing structure according to an exemplary embodiment of the present invention includes an LCD panel 100, a backlight unit 200, and a mold frame 300. At this time, the LCD panel 100 and the backlight unit 200 have a side structure fixed to the mold frame 300 to form a layered structure.

The LCD panel 100 is disposed to face the backlight unit 200, and includes a lower polarizer 130, a thin film transistor board 110, a color filter board 120, and the two substrates. The liquid crystal (Liquid Cristal, not shown), the upper polarizing plate 120 and the lower polarizing plate 130 are sequentially stacked, and the light shielding layer 140 is disposed on the side and upper and lower portions of the LCD panel 100.

In this case, the thin film transistor substrate 110 is a transistor thin film formed on a glass substrate, the transistor thin film serves to transmit and control the electrical signal.

In addition, the liquid crystal (Liquid Cristal) is an organic molecule having a fluidity between the solid state and the liquid, has an elongated shape and the refractive index may vary depending on the transmission direction of light. Therefore, the arrangement of molecules is changed according to the applied voltage to control the transmission of light.

The lower polarizer 130 and the upper polarizer 132 may transmit only light in a specific direction to adjust the alignment of the liquid crystals.

The color filter substrate 120 functions to display images of various colors by regularly arranging a resin film including RGB (red, blue, green) pigments on a glass substrate.

The light blocking layer 140 may be disposed on side surfaces of the thin film transistor substrate 110 and the color filter substrate 120, or may be formed over the side surfaces and portions of the top and bottom surfaces of the thin film transistor substrate 110 and the color filter substrate 120. have. In this case, a part of the substrates 110 and 120 may be part or the whole of the edge where the polarizers 130 and 132 are not disposed.

Meanwhile, the light blocking layer 140 may be any one of a printed layer, a film, and a coated film. In this case, the printing layer may be formed of a printing pigment (Pigment) of the color having a very low transmittance, for example, a pigment including carbon black (Carbon Black) representing a black color may be used.

In addition, since the light is hardly transmitted, a synthetic resin film applied with a color can be applied. Such a film may be attached to the side of the LCD panel by pressing or using a separate adhesive.

On the other hand, the coating layer may be formed by a method of applying a synthetic resin of a dark color to which the fluidity and low light transmittance is applied.

The backlight unit 200 is disposed below the LCD panel and irradiates light toward the LCD panel. The backlight unit 200 includes a reflective sheet 210, a light guide plate 220, a diffusion sheet 230, a prism sheet, 240 and the protective sheet 250 are sequentially stacked, and a light emitting diode lamp (LED lamp) or a cold cathode tube lamp (CCFL), which is a light source (not shown), is disposed on a side surface of the light guide plate.

The light guide plate 220 is a kind of optical lens that changes the path of the light emitted from the light source to be directed toward the diffusion sheet 230 and may be made of PMMA, which is a synthetic resin having high transparency. In order to change the path of the light, a light guide pattern is formed on one side or both sides of the light guide plate, and the shape of the light guide pattern may be differently determined as necessary, such as a bar pattern, a dot pattern, and a checkerboard pattern.

The reflective sheet 210 has an area almost identical to that of the light guide plate 220 and is disposed below the light guide plate 220. The light passing through the light guide plate 220 may be leaked downward, and the light leaked from the light guide plate 220 may be reflected from the surface of the reflective sheet 210 and then incident again to the light guide plate 210, and may be directed toward the reflective sheet 210. .

The diffusion sheet 230 is disposed on the light guide plate 220 and diffuses the light guided by the light guide plate 220 so that the light uniformly reaches the entire surface of the LCD panel. In this case, a plurality of dot patterns may be formed on the surface in order to diffuse the light efficiently.

The prism sheet 240 may be disposed on the diffusion sheet 230, and may perform a function of concentrating light uniformly diffused by the diffusion sheet 230 to improve luminance.

In addition, the protective sheet 250 may be disposed on the prism sheet 240 to protect the surface of the prism sheet 240 from scratches and the like.

The mold frame 300 is an injection molded product made of high strength synthetic resin such as polycarbonate, and accommodates a plurality of substrates, sheets, etc. forming the LCD panel 200 and the backlight unit 100 to be fixed in a layered structure. It is a part that supports.

In this case, in order to prevent light from leaking in the gap formed between the mold frame 300 and the backlight unit 200, a light shielding tape 310 is generally attached to the gap.

As described above, the light shielding tape 310 may partially prevent the light emitted from the backlight unit 200 from leaking to other portions other than the screen display area of the LCD panel 100.

However, when the light shielding layer 140 is not formed in the embodiment of the present invention, the light incident on the LCD panel 100 has side surfaces of the thin film transistor substrate 110 and the color filter substrate 120 including the glass substrate. It is still impossible to prevent the appearance of light leakage. Therefore, the light blocking layer 140 may provide a light blocking layer on side surfaces of the thin film transistor substrate 110 and the color filter substrate 120, thereby minimizing light leakage at the edge of the screen display area and deteriorating the overall image quality. .

FIG. 2 is a flowchart sequentially illustrating a method of manufacturing an LCD module according to an embodiment of the present invention, and FIG. 3 is a process diagram sequentially showing a process of pad printing applied to manufacturing an LCD module of the present invention.

According to Figure 2, the manufacturing method of the LCD module of the present invention, the first step of preparing the LCD panel, the second step of forming the light shielding layer, the third step of preparing the backlight unit and the mold frame And a fifth step of assembling the LCD panel subjected to the fourth step and the second step and the backlight unit prepared in the third step to the mold frame.

Here, the method of assembling the components of the LCD module will be by methods generally known to those skilled in the art, so the detailed description will be omitted, and the second step constituting the features of the present invention will be described.

In particular, the second light shielding layer may be formed by pad printing. Hereinafter, the pad printing process will be described in detail.

The pad printing refers to printing of a method of firstly imprinting an ink wire of a printing plate which is a concave plate on a transcription pad, and then secondarily transferring the printed material to a printed object.

Before describing the pad printing process, the structure of the pad printing machine used herein will be briefly described, and then the printing process will be described sequentially.

Referring to FIG. 3, the pad printer 400 largely includes a printing plate 410, an ink supply unit 420, and a transfer pad 430.

The printing plate 410 is made of a metal plate, and a concave portion 412 corresponding to the ink wire is formed. At this time, the recess 412 may be made through the corrosion of the metal plate, it is preferable to corrode to a depth of about 0.2mm.

The ink supply unit 420 stores ink 422 used for printing and supplies the concave portion 412 to the required amount. In this case, the ink 422 may be a black pigment, and preferably, may be carbon black.

In addition, the transfer pad 430 is an elastic body made of rubber, silicon, or the like, and the ink 422 supplied to the recess 420 may be primarily coated, and may be transferred to the printed object.

Looking at the pad printing process applied to the LCD module manufacturing method of the present invention with reference to the structure of the pad printing machine, the first step is to prepare a printing plate 410, the ink 422 is supplied to the recess 412 (S 1).

In this case, the concave portion 412 is engraved in a pattern corresponding to the light shielding layer 140 applied to the LCD module of the present invention, the depth of the intaglio may be determined according to the thickness of the light shielding layer 140. In addition, after the ink 422 is supplied to the recess 412 by the ink supply unit 420, a process of scraping the surface of the printing plate 410 is required to make the ink 422 supply surface uniform. Next, the transfer pad 430 is positioned on the recess 412 to prepare for printing.

The second step is to transfer the ink 422 to the transfer pad 430 (S 2).

The third step is a step (S 3) to prepare the print by placing the side of the LCD panel 100 to be printed and the transfer pad 430 to which the ink 422 is transferred face to face.

In the fourth step, the light that has been primarily transferred to the transfer pad 430 is printed on the side of the LCD panel 100 to form the light shielding layer 140, and the new concave portion 412 is supplied with new ink 422. Step S4.

The fifth step is to remove the transfer pad 430 from the LCD panel 100, and complete the light shielding layer 140 on the LCD panel 100 (S5).

In this case, a heating and drying process for fixing after printing may be further added according to the component of the material applied with the ink 422.

As mentioned above, preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. It is possible.

For example, although the printing method applied to the manufacturing method of the LCD module of the present invention illustrates only pad printing, the scope of the present invention is not limited to the pad printing, and in some cases, other known printing methods such as silk screen printing are applied. can do. Furthermore, the formation of the light shielding layer, which is a feature of the present invention, may be performed by attaching a film having a light shielding function or coating a light shielding material as well as printing.

100: LCD panel 110: thin film transistor substrate
120: color filter substrate 130: lower polarizing plate
132: upper polarizing plate 140: light shielding layer
200: backlight unit 210: reflective sheet
220: light guide plate 230: diffusion sheet
240: prism sheet 250: protective sheet
300: mold frame 310: shading tape
400: pad printing machine 410: printing plate
412: recess 420: ink supply portion
422: ink 430: elastic pad

Claims (12)

A thin film transistor substrate which is a glass substrate including a thin film transistor;
A color filter substrate disposed on the thin film transistor substrate in the same shape and being a glass substrate including a color filter;
A lower polarizer and an upper polarizer disposed on a lower surface of the thin film transistor substrate and an upper surface of the color filter substrate, respectively, and transmit light in a specific direction; And
And a light shielding layer disposed on a side surface of the thin film transistor substrate and the color filter substrate and preventing light from leaking through the side surface. The method of claim 1,
The light shielding layer,
And a light shielding layer further comprising a light shielding layer on a part or the entirety of an edge region of the lower surface of the thin film transistor substrate and an upper surface of the color filter substrate, on which a polarizer is not disposed. The method according to claim 1 or 2,
The light shielding layer,
LCD module having a light leakage prevention structure, characterized in that any one of a printing pigment, a film and a coating layer capable of preventing the transmission of light. A thin film transistor substrate which is a glass substrate including a thin film transistor, a color filter substrate which is disposed on the thin film transistor substrate in the same shape and comprises a color filter, and the thin film transistor; A first step of preparing an LCD panel disposed on a lower surface of a substrate and an upper surface of the color filter substrate, the LCD panel including a lower polarizer and an upper polarizer for transmitting light in a specific direction;
A second step of forming a light shielding layer to prevent light leakage from a side surface formed by the thin film transistor substrate and the color filter substrate of the LCD panel prepared in the first step;
A third step of preparing a backlight unit disposed under the lower polarizer of the LCD panel to irradiate light;
Preparing a mold frame for accommodating and installing the LCD panel and the backlight unit; And
And a fifth step of assembling the LCD panel subjected to the second step and the backlight unit prepared in the third step to a mold frame. The method of claim 4, wherein
The second step comprises:
The light shielding layer is formed on the LCD module having a light leakage prevention structure, characterized in that further formed on the part or the entirety of the lower surface of the thin film transistor substrate and the upper surface of the color filter substrate in which the polarizing plate is not disposed. The method according to claim 4 or 5,
The second step comprises:
The light shielding layer is a manufacturing method of the LCD module having a light leakage prevention structure, characterized in that formed by any one of printing, film attachment and coating. The method of claim 6,
The printing,
A method for manufacturing an LCD module having a light leakage preventing structure, characterized in that the pad printing (Pad Printing) or silk screen printing (Silk Screen Printing). The method of claim 7, wherein
The pad printing,
A first step of preparing a printing plate to which ink is supplied to a recessed portion corresponding to the light blocking layer;
A second step of transferring the ink to a transcription pad which is an elastic body; And
And a third step of printing the light shielding layer on the LCD panel by the transfer pad to which the ink is transferred. The method of claim 8,
The ink,
A method of manufacturing an LCD module having a light leakage preventing structure, characterized in that the pigment (Pigment) that can prevent the transmission of light. 10. The method of claim 9,
The pigment,
Method of manufacturing an LCD module having a light leakage prevention structure, characterized in that the carbon black (Carbon Black). The method of claim 6,
The film is attached,
Method of manufacturing an LCD module having a light leakage prevention structure, characterized in that the compression or using a separate adhesive. The method of claim 6,
The coating is
A method of manufacturing an LCD module having a light leakage preventing structure, characterized by comprising a method of applying a flowable synthetic resin.

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