KR20070035303A - Liquid crystal display and method of manufacturing thereof - Google Patents

Abstract

Provided are a liquid crystal display device and a method for manufacturing the same, in which an antistatic layer is formed on a liquid crystal panel to prevent static electricity and reduce manufacturing costs. The liquid crystal display device includes a liquid crystal panel, a backlight assembly for supplying light to the liquid crystal panel, polarizing plates positioned on the upper and lower sides of the liquid crystal panel to selectively transmit light, and positioned between the liquid crystal panel and the polarizing plate, It includes an antistatic layer to prevent.

Liquid crystal display, polarizer, antistatic layer

Description

Liquid crystal display and manufacturing method thereof

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II to II ′ after assembling the liquid crystal display of FIG. 1.

FIG. 3 is an enlarged view of part III of FIG. 2.

4 is a block diagram of an apparatus for forming an antistatic layer included in a liquid crystal display according to an exemplary embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

100: liquid crystal display device 1: thin film transistor array panel

3: common electrode display panel 5: liquid crystal panel

10: liquid crystal panel assembly 20: backlight assembly

50a: upper polarizer 50b: lower polarizer

320: antistatic layer

The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device and a manufacturing method thereof that can prevent a defect caused by static electricity.

In general, a liquid crystal display includes a liquid crystal layer interposed between a common electrode display panel on which a common electrode, a color filter, and the like are formed, and a thin film transistor array panel on which a thin film transistor and a pixel electrode are formed. By applying an electric potential, an electric field is formed to change the arrangement of liquid crystal molecules, and thereby, an image is represented by adjusting the light transmittance.

Among them, the patterned vertically aligned (PVA) mode in which the incision pattern is formed on each of the pixel electrode and the common electrode is recognized as a wide viewing angle technology that can replace the in plane switching (IPS) mode.

In the IPS mode, since the common electrode of the common electrode display panel is formed in a plate shape, discharge due to static electricity generated due to external pressure applied to the liquid crystal panel may be easily performed. On the other hand, in the PVA mode, since the incision pattern is formed on the common electrode of the common electrode display panel, when external pressure is applied to the liquid crystal panel, charges are accumulated in the portion where the incision pattern is formed, thereby reducing the movement of the charge relatively. The discharge by static electricity cannot be easily made.

Therefore, the PVA mode adopts a polarizing plate structure in which a conductive film is added to the polarizing film in order to prevent static electricity generated when external pressure is applied to the liquid crystal panel.

Such a polarizing plate further forms an antistatic layer (Anti Static; AS) on the upper support film in order to prevent display defects caused by static electricity of the liquid crystal display.

However, when the antistatic layer is formed on the polarizer, a problem arises in that static electricity is difficult to be discharged to the atmosphere during reliability EDS (Electric Die Sorting) evaluation or G / T (Gross / Tester) inspection. In this case, a method of forming two antistatic layers on the upper polarizer has been proposed. The problem that the manufacturing cost of a polarizing plate itself becomes high arises.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a liquid crystal display device in which an antistatic layer is formed on a liquid crystal panel to prevent defects caused by static electricity and to reduce manufacturing costs.

Another object of the present invention is to provide a method of manufacturing such a liquid crystal display.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, a liquid crystal display device includes a liquid crystal panel, a backlight assembly for supplying light to the liquid crystal panel, and positioned on upper and lower surfaces of the liquid crystal panel to selectively transmit light. It is located between a polarizing plate, a liquid crystal panel, and a polarizing plate, and includes an antistatic layer which prevents static electricity.

According to another aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, including preparing a liquid crystal panel, forming an antistatic layer on upper and lower surfaces of the liquid crystal panel, and forming an antistatic layer on the antistatic layer. Attaching the polarizing plate.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Examples of the liquid crystal display used in the present invention include a portable multimedia player (PMP), a personal digital assistant (PDA), a portable digital player (DVD) player, a mobile phone, a notebook computer, and a digital TV. However, the present invention is not limited thereto and may be applied to various liquid crystal display devices.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II to II ′ after assembling the liquid crystal display of FIG. 1, and FIG. An enlarged view of part III.

1 to 3, the liquid crystal display 100 generally includes a liquid crystal panel assembly 10, a backlight assembly 20, an upper accommodating container 40, and a lower accommodating container 30.

The liquid crystal panel assembly 10 may include a thin film transistor array panel 1, a liquid crystal panel 5 including a common electrode display panel 3, a liquid crystal layer (not shown), a gate tape carrier package 7, and a data tape carrier package ( 8) and a printed circuit board 9 and the like.

The liquid crystal panel 5 includes a thin film transistor array panel 1 including a gate line (not shown) and a data line (not shown), a thin film transistor array, a pixel electrode, and the like, a color filter, a black matrix, a common electrode, and the like. The common electrode panel 3 disposed to face the thin film transistor array panel 1 and the liquid crystal layer filled between the two display panels 1 and 3 are included.

The formation process of the liquid crystal panel 5 will be described below.

First, a metal film is deposited on a transparent insulating substrate made of an insulating material such as glass or ceramic, and then patterned to form a gate line and a gate electrode. At this time, the metal film is made of aluminum-based metal such as aluminum (Al) and aluminum alloy, silver-based metal such as silver (Ag) and silver alloy, copper-based metal such as copper (Cu) and copper alloy, molybdenum (Mo) and molybdenum alloy Molybdenum-based metals, chromium (Cr), titanium (Ti), tantalum (Ta) and the like can be used.

Subsequently, silicon nitride is deposited on the entire surface of the transparent insulating substrate including the gate electrode to form a gate insulating film.

An amorphous silicon film is formed on the gate insulating film and then patterned to form an active layer on the gate insulating film over the gate electrode. Subsequently, after depositing a metal film such as chromium, molybdenum-based metal, tantalum and titanium on the entire surface of the resultant product, the metal film is patterned to form a data line orthogonal to the gate line, a source electrode and a drain electrode branched from the data line. To form.

Through the above process, a thin film transistor including a gate electrode, an active layer, a source electrode, and a drain electrode is completed. Subsequently, an insulating layer is formed on the entire surface of the transparent insulating substrate on which the thin film transistor is formed. Then, a metal film, for example, a reflective conductive film or a transparent conductive film or a metal film in which the reflective conductive film and the transparent conductive film are laminated is deposited on the insulating layer, and then the metal film is patterned into a predetermined pixel shape to form a pixel electrode.

Subsequently, an alignment film for pre-tilting the liquid crystal molecules in the liquid crystal layer at a selected angle is formed by applying a resist on the pixel electrode and rubbing treatment or the like.

In the above-described process, the thin film transistor array panel 1 including the thin film transistor and the pixel electrode is completed.

Next, the common electrode display panel 3 forms a black matrix that prevents light leakage on the transparent insulating substrate, and forms a color filter composed of red, green, and blue. At this time, the black matrix can be formed using a metal thin film such as chromium, an organic compound, or the like.

Subsequently, a common electrode made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) is formed on the color filter, and a liquid crystal is applied to the common electrode by applying a resist and rubbing treatment. An alignment film is formed to pre-tilt the liquid crystal molecules in the layer at a selected angle.

Through the above-described process, the thin film transistor array panel 1 and the common electrode display panel 3 are completed.

The thin film transistor array panel 1 and the common electrode panel 3 thus completed are precisely bonded to each other, and a liquid crystal layer is formed therebetween to form the liquid crystal panel 5.

Meanwhile, an antistatic layer 320 that prevents static electricity is formed on outer surfaces of each of the thin film transistor array panel 1 and the common electrode panel 3 constituting the liquid crystal panel 5.

The antistatic layer 320 includes a plurality of conductive particles made of antimony-tin, gold, or the like, and each of the outer surface of the thin film transistor array panel 1 and the common electrode display panel 3 has a thickness of approximately 8 μm to 12 μm. Is formed. At this time, a printing method using a roller is used, which will be described in detail later with reference to FIG. 4.

In addition, the conductive particles included in the antistatic layer 320 preferably have an average particle diameter of 0.01 μm to 2 μm, and the conductive particles may be between 50% and 90% of the total amount of the antistatic layer 320. It is preferable to add at a value within the range of. This is to improve the balance between the surface resistivity of the antistatic layer 320 and the total light transmittance.

The polarizer 50 is disposed on the antistatic layer 320. The polarizer 50 serves to selectively transmit light, and is composed of polarizing films 301 and 311 and support layers 302a, 302b, 312a and 312b. In addition, the polarizer 50 is adhered to the antistatic layer 320 by an adhesive (not shown) or an adhesive layer (not shown).

The polarizer 50 is divided into an upper polarizer 50a positioned on the upper surface of the liquid crystal panel 5 and a lower polarizer 50b positioned on the lower surface of the liquid crystal panel 5. In this case, the upper polarizer 50a may further include a surface treatment film 303.

In this case, the surface treatment film 303 serves to prevent agitation and scratches on the surface of the upper polarizing plate 50a, and includes an anti-glare layer AG, a hard coating layer HC, an antireflection layer AR, and a low reflection layer. Any one of (LR) can be formed.

On the other hand, the data tape carrier package 8 is connected to each data line formed in the thin film transistor array panel 1, and the gate tape carrier package 7 is connected to each gate line formed in the thin film transistor array panel 1.

The printed circuit board 9 includes various driving components for processing both the gate driving signal and the data driving signal for inputting the gate driving signal to the gate tape carrier package 7 and the data driving signal to the data tape carrier package 8. This is mounted.

The backlight assembly 20 is composed of the optical sheets 21, the lamp assembly 25, the light guide plate 23, the reflective sheet 27, and the like.

Here, the light guide plate 23 serves to guide the light emitted from the lamp assembly 25. The light guide plate 23 is formed of a panel of a plastic-based transparent material such as acryl to propagate light generated from the lamp assembly 25 toward the liquid crystal panel 5 seated on the light guide plate 23. Accordingly, various patterns for converting the traveling direction of light incident into the light guide plate 23 toward the liquid crystal panel 5 may be printed on the rear surface of the light guide plate 23. In addition, a light guide film having a ductility may be used instead of the light guide plate 23.

The lamp assembly 25 includes a lamp reflecting plate which is inserted into the side of the light guide plate 23 to emit such light and surrounds the lamp. As a lamp used in the lamp assembly 25, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like may be used.

The reflective sheet 27 is installed on the lower surface of the light guide plate 23 to reflect the light emitted to the lower portion of the light guide plate 23 upward. The reflective sheet 27 is located on the lower surface of the light guide plate 23, and reflects light, which is not reflected by the minute dot pattern on the back surface of the light guide plate 23, toward the exit surface of the light guide plate 23. At the same time, it reduces the light loss of the light incident on the light guide plate 23 and improves the uniformity of the light transmitted to the exit surface of the light guide plate 23.

The optical sheets 21 are mounted on the upper surface of the light guide plate 23 to diffuse and collect light transmitted from the light guide plate 23. The optical sheets 21 include a diffusion sheet, a prism sheet, a protective sheet, and the like.

In the case of the small liquid crystal display device 100, one lamp is usually installed on the side of the light guide plate 23, but as the liquid crystal display device 100 becomes larger, a plurality of lamps may be provided in one lamp assembly 25 to obtain sufficient luminance. Can be installed. In addition, an inverter (not shown) and a lamp assembly 25 that apply power to the lamp of the lamp assembly 25 are electrically connected by wires.

The liquid crystal panel assembly 10 is installed on the protective sheet, and is seated in the lower housing 30 together with the backlight assembly 20. The lower container 30 has a rectangular shape and sidewalls are formed along the edge of the upper surface to receive and fix the backlight assembly 20 and the liquid crystal panel assembly 10 in the sidewalls. The back light assembly 20 provided is prevented from bending. And the printed circuit board 9 of the liquid crystal panel assembly 10 is bent along the outer surface of the lower container 30 is seated on the back of the lower container (30). Here, the shape of the lower housing 30 may be variously modified according to a method of accommodating the backlight assembly 20 or the liquid crystal panel assembly 10 in the lower housing 30.

In addition, the upper accommodating container 40 is disposed to be coupled to the lower accommodating container 30 so as to cover an upper surface of the liquid crystal panel assembly 10 accommodated in the lower accommodating container 30.

The upper container 40 may be coupled to the lower container 30 through a hook (not shown). For example, a hook is formed along an outer surface of the side wall of the lower container 30 and corresponds to the hook. Hook insertion hole (not shown) may be formed on the side of the upper receiving container (40). Therefore, as the upper storage container 40 descends from above the lower storage container 30, the hook formed in the lower storage container 30 enters the hook insertion hole of the upper storage container 40, thereby lowering the storage container 30. And the upper receiving container 40 may be fastened. In addition, the combination of the upper storage container 40 and the lower storage container 30 may be modified in various forms.

Hereinafter, an apparatus for forming an antistatic layer will be described with reference to FIG. 4.

4 is a block diagram of an apparatus for forming an antistatic layer included in a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the antistatic layer forming apparatus 400 includes a supply unit 410, a storage unit 430, a printing unit 420, and the like.

In this case, the printing unit 420 is surrounded by the printing plate making and the first roller 426 for printing a predetermined solution mixed with the conductive particles on the upper surface of the liquid crystal panel 5, and the conductive particles accommodated in the storage unit 430 The second roller 422 for uniformly depositing the mixed solution obtained by contacting the predetermined solution mixed with the first roller 426 and the solution in which the conductive particles are mixed are uniformly on the surface of the second roller 422. And a third roller 424 to be applied.

That is, the predetermined solution in which the conductive particles supplied through the supply unit 410 are mixed is accommodated in the storage unit 430, and a part of the second roller 422 is dipped into the mixed solution contained in the storage unit 430 ( dipping) to obtain a mixed solution on its surface. Then, the second roller 422 deposits the mixed solution obtained on the first roller 426 which is in contact with each other and rotates, and the mixing is performed on the liquid crystal panel 5 which is transported while being seated on the upper portion of the transfer plate 440. Allow the solution to print. In addition, the outer surface of the first roller 426 is surrounded in close contact with a printing plate that performs substantial printing on the liquid crystal panel 5.

In addition, the storage unit 430 is provided with a feed tube insertion groove (not shown) into which a supply tube 415 is inserted for distribution of a predetermined solution in which conductive particles supplied from the supply unit 410 are mixed.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

According to the liquid crystal display of the present invention and the manufacturing method thereof as described above, there are one or more of the following effects.

First, there is an advantage of preventing the static electricity by forming an antistatic layer on the liquid crystal panel.

Second, there is an advantage in reducing the manufacturing cost of the liquid crystal display.

Claims (10)

Liquid crystal panels; A backlight assembly supplying light to the liquid crystal panel; A pair of polarizing plates positioned on upper and lower surfaces of the liquid crystal panel and selectively transmitting light; And And an antistatic layer disposed between the liquid crystal panel and the polarizer to prevent static electricity. According to claim 1, The antistatic layer has a thickness of 8 ~ 12㎛ liquid crystal display device. According to claim 1, The antistatic layer is formed by a printing method using a roller. According to claim 1, The antistatic layer includes a liquid crystal display device. The method of claim 4, wherein The conductive particles are made of antimony-tin or gold. Preparing a liquid crystal panel; Forming antistatic layers on upper and lower surfaces of the liquid crystal panel; And And attaching polarizing plates to the antistatic layer, respectively. The method of claim 6, The antistatic layer has a thickness of 8 ~ 12㎛ manufacturing method of the liquid crystal display device. The method of claim 6, The forming of the antistatic layer is a step of forming on the liquid crystal panel by a printing method using a roller. The method of claim 6, And the antistatic layer comprises conductive particles. The method of claim 9, And the conductive particles are made of antimony-tin or gold.

Images