KR20130035684A - Liquid crystal display apparatus and method for manufacturing the same - Google Patents

Abstract

PURPOSE: A liquid crystal display and a manufacturing method thereof are provided to prevent optical reflection, thereby improving visibility. CONSTITUTION: An ESD(Electrostatic Discharge) layer(140) is formed on an upper substrate(130). The ESD layer surrounds the upper part of the upper substrate. An ESD pad is formed on a lower substrate(110). The ESD layer is electrically connected to the ESD pad. Electric charges of the liquid crystal panel are discharged to the ground via the ESD pad.

Description

Liquid crystal display and its manufacturing method {LIQUID CRYSTAL DISPLAY APPARATUS AND METHOD FOR MANUFACTURING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device, and more particularly, to a liquid crystal display device and a method for manufacturing the same, which can improve outdoor visibility of an image by reducing light reflectance and reduce manufacturing cost.

With the development of various portable electronic devices such as mobile communication terminals and notebook computers, there is an increasing demand for a flat panel display device that can be applied thereto.

As a flat panel display, a liquid crystal display device, a plasma display panel, a field emission display device, and a light emitting diode display device are studied. have.

Among such flat panel display devices, the liquid crystal display device has been expanding its application field due to the development of mass production technology, ease of driving means, low power consumption, high quality, and large screen.

A general liquid crystal display device includes a liquid crystal panel bonded to face a lower substrate and an upper substrate with the liquid crystal layer 20 therebetween, and a driving circuit for applying a driving voltage and a signal to the liquid crystal panel. The liquid crystal display displays an image according to an image signal by adjusting the transmittance of light passing through the liquid crystal layer 120 of each of the plurality of pixels according to the data voltage.

Recently, as an input device of a flat panel display device, an input means such as a mouse or a keyboard, or an input device such as a keypad used as an input device of a portable electronic device, is replaced by a user using a finger or a pen. Touch screens that can enter information directly into the application have been applied.

Such touch screens include monitors such as navigation, industrial terminals, notebook computers, financial automation devices, game machines, and the like; Portable terminals such as mobile phones, MP3s, PDAs, PMPs, PSPs, portable game machines, DMB receivers, tablet PCs, and the like; And household appliances such as refrigerators, microwaves, washing machines, and the like; It is being applied to, etc., the application is expanding because of the advantages that anyone can easily operate.

According to the structure in which the touch screen is combined with the liquid crystal panel, an in-cell method that is refractory in a cell of the liquid crystal panel, an on-cell method formed on the liquid crystal panel, and an add-on method in which the touch screen is coupled to the outside of the liquid crystal panel Can be distinguished.

1 is a view showing a liquid crystal display according to the prior art.

Referring to FIG. 1, the lower substrate 10 (the TFT array substrate), the upper substrate 30 (the color filter array substrate), the liquid crystal layer 20, the adhesive layer 40, the antistatic layer 50, and the polarizing film 60 may be formed. Include.

The lower substrate 10 has a pixel array 14 formed on the lower glass substrate 12. The pixel array includes a thin film transistor (TFT) for switching pixels, a common electrode, and a pixel electrode.

The upper substrate 30 is formed between the RGB color filter 34 and the color filter 34 on the upper glass substrate 32 to planarize the black matrix 36 and the upper substrate 30 to prevent mixing of color light. Overcoat layer 38 is included.

The liquid crystal layer 20 is formed in the space between the lower substrate 10 and the upper substrate 30.

An electrostatic discharge layer 40 (ESD layer) formed of an indium tin oxide (ITO) material is formed on the upper substrate 30. The adhesive layer 50 is formed on the antistatic layer 40, and the polarizing film 60 is formed thereon.

Recently, in order to improve the portability of a smart phone or a smart book, development has been made in order to reduce the thickness and weight of a liquid crystal panel by etching and thinning a glass substrate which is a heavy material. .

In the liquid crystal display according to the related art including the above-described configuration, when the polarizing film 60 is attached in the manufacturing process, static electricity may be generated, and static electricity may be generated during driving for displaying an image. In order to remove the static electricity, the antistatic layer 50 is formed.

Here, the polarizing film 60 has a refractive index of 1.49 to 1.52, the upper glass substrate 32 has a refractive index of 1.50, and the antistatic layer 50 has a refractive index of 2.0. The polarizing film 60 and the antistatic layer 50 Due to the difference in refractive index, the light incident from the outside is reflected. In addition, due to the difference in refractive index between the antistatic layer 50 and the upper glass substrate 32, light emitted to the outside through the liquid crystal layer 20 is reflected.

When light reflection occurs due to a difference in refractive index between the polarizing film 60, the antistatic layer 50, and the upper glass substrate 32, the relative luminance of the image displayed on the liquid crystal panel is lowered, thereby lowering the visibility of the image.

In particular, a smart phone or a smart book to which a liquid crystal display is applied may be driven outdoors. When light reflection occurs due to a difference in refractive index between the polarizing film 60 and the antistatic layer 50, the image There is a problem in that the outdoor visibility of the display quality is very low and the display quality is lowered.

In addition, since ITO, which is a material of the antistatic layer 50, is very expensive, there is a problem in that a manufacturing cost of the liquid crystal display is increased, and an antistatic performance is deteriorated due to the high resistance of ITO.

During the manufacturing process, after the etching process of the upper glass substrate 32, ITO is coated to form an antistatic layer 40. At this time, by forming the ITO layer through a sputter (tact time) of the manufacturing process (tact time ), There is a problem that the productivity of the liquid crystal display is lowered.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is a technical object of the present invention to provide a liquid crystal display and a method for manufacturing the same, which can improve ESD shielding performance.

Disclosure of Invention The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a liquid crystal display device and a method of manufacturing the same, which can improve outdoor visibility by preventing light reflection.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and to reduce the manufacturing cost of the liquid crystal display device as a technical problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is a technical object of the present invention to provide a method for manufacturing a liquid crystal display device which can improve productivity by reducing the tex time of the manufacturing process according to the formation of the antistatic layer.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an exemplary embodiment of the present invention, a liquid crystal display includes: a lower substrate and an upper substrate bonded to each other with a liquid crystal layer interposed therebetween; An antistatic layer formed on an outer non-display area on the upper substrate; A polarizing film formed on the antistatic layer; And a conductive adhesive layer for adhering the antistatic layer and the polarizing film.

In the liquid crystal display according to the exemplary embodiment, the refractive index of the polarizing film is 1.49 to 1.52, the refractive index of the adhesive layer is 1.49 to 1.52, and the refractive index of the glass substrate of the upper substrate is 1.50.

The antistatic layer of the liquid crystal display according to the embodiment of the present invention is characterized in that it is formed to have a line width of 1.0mm ~ 10.0mm.

The antistatic layer of the liquid crystal display according to the exemplary embodiment of the present invention may be formed of indium tin oxide (ITO) or antimony tin oxide (ATO) material.

The antistatic layer of the liquid crystal display according to the exemplary embodiment of the present invention may be formed of nickel (Ni), molybdenum (Mo), chromium (Cr), silver (Ag), or magnesium oxide (MgO).

According to an aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, the method comprising: aligning a mask having a predetermined pattern formed on an upper glass substrate of a liquid crystal panel; Forming an antistatic layer on an outer surface of the upper glass substrate by a printing method using a mask, a metal sputter method, a gravure coating method, or a silk screen method; Forming a conductive adhesive layer on the antistatic layer; And adhering a polarizing film on which the charging process is performed on the antistatic layer using the conductive adhesive layer.

The present invention according to the embodiment can provide a liquid crystal display device and a method of manufacturing the same that can improve the ESD shielding performance.

The present invention according to the embodiment can provide a liquid crystal display and a method of manufacturing the same that can improve the outdoor visibility by preventing light reflection.

The present invention according to the embodiment can reduce the manufacturing cost of the liquid crystal display.

According to an exemplary embodiment of the present invention, productivity of the liquid crystal display may be improved by reducing the tex time of the manufacturing process according to the formation of the antistatic layer.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a view showing a liquid crystal display device according to the prior art.
2 is a view showing a light reflection problem according to the refractive index difference between the polarizing film and the antistatic layer.
3 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention.
4 is a view showing an antistatic layer according to an embodiment of the present invention.
5 is a view showing an antistatic layer according to another embodiment of the present invention.
6 is a view illustrating a manufacturing method of a liquid crystal display according to an exemplary embodiment of the present invention.

Hereinafter, a liquid crystal display according to embodiments of the present invention will be described with reference to the accompanying drawings.

Liquid crystal displays have been developed in various ways, such as twisted nematic (TN) mode, vertical alignment (VA) mode, in plane switching (IPS) mode, and fringe field switching (FFS) mode.

In the IPS mode and the FFS mode, a pixel electrode and a common electrode are disposed on a lower substrate to adjust the arrangement of the liquid crystal layer by an electric field between the pixel electrode and the common electrode.

Particularly, in the IPS mode, the pixel electrode and the common electrode are alternately arranged in parallel to each other to generate a transverse electric field between both electrodes to adjust the alignment of the liquid crystal layer.

The IPS mode has a disadvantage in that the arrangement of the liquid crystal layer is not controlled in the upper portion of the pixel electrode and the common electrode, so that light transmittance in the region is reduced.

The FFS mode is designed to overcome the shortcomings of the IPS mode. In the FFS mode, the pixel electrode and the common electrode are formed to be spaced apart with an insulating layer therebetween.

At this time, one electrode is formed in a plate shape or a pattern and the other electrode is formed in a finger shape, and the arrangement of the liquid crystal layer is controlled through a fringe field generated between the electrodes Method.

In the liquid crystal display according to the exemplary embodiment, all of the above-described TN mode, VA mode, IPS mode, and FFS mode may be applied.

A liquid crystal display device according to an embodiment of the present invention includes a liquid crystal panel for displaying an image, a backlight unit for supplying light to the liquid crystal panel, and a driving circuit.

The driving circuit unit includes a timing controller T-con, a data driver D-IC, a gate driver G-IC, a sensing driver, a backlight driver, and a power supply unit supplying driving power to the driving circuits.

The timing controller converts input image data into digital image data R, G, and B in units of frames by using the input timing signal TS, and converts digital image data arranged in units of frames to a data driver. To feed. Here, the timing signal TS includes a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, and a clock signal CLK.

In addition, the timing controller uses the vertical synchronizing signal Vsync, the horizontal synchronizing signal Hsync, and the clock signal CLK to control the gate control signal GCS for controlling the gate driver, and the data control signal for controlling the data driver. Create a (DCS). The generated gate control signal GCS is supplied to the gate driver, and the data control signal DCS is supplied to the data driver.

The data control signal DCS includes a source start pulse (SSP), a source sampling clock (SSC), a source output enable (SOE), and a polarity control signal (POL: polarity). And the like.

The gate control signal GCS may include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable (GOE), and the like.

Here, all or part of the driving circuit unit may be formed on the liquid crystal panel in a chip on glass (COG) or chip on flexible printed circuit (chip on film) method.

The backlight unit includes a light source for generating light supplied to the liquid crystal panel and a plurality of optical members for improving light efficiency.

Here, the light source may be a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp (EEFL), or a Light Emitting Diode (LED).

The plurality of optical members may include a light guide panel (LGP), a diffusion film, a prism sheet, and a dual brightness enhancement film (DBEF).

3 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating an antistatic layer according to an exemplary embodiment of the present invention.

3 and 4, a liquid crystal display according to an exemplary embodiment of the present invention may include a lower substrate 110, a TFT array substrate, an upper substrate 130, a color filter array substrate, a liquid crystal layer 120, and an adhesive layer 140. ), An antistatic layer 150, and a polarizing film 160.

The liquid crystal layer 120 is formed in a space between the lower substrate 110 and the upper substrate 130.

The lower substrate 110 includes a pixel array 114 in which a plurality of pixels are formed to control the arrangement of the liquid crystal layer 120.

The pixel array 114 includes a plurality of gate lines and a plurality of data lines formed to intersect, and a plurality of pixels are defined by the plurality of gate lines and the plurality of data lines.

TFTs and storage capacitors for switching are formed in the plurality of pixels, and pixel electrodes for supplying a data voltage to the pixels and a common electrode for supplying a common voltage Vcom are formed.

The TFT supplies the data voltage supplied through the data lines to the pixel in response to a scan signal (gate driving signal) supplied through the gate line.

The pixel electrode and the common electrode may be formed of a transparent conductive material such as indium tin oxide (ITO).

The upper substrate 130 includes a color filter 134 and a black matrix 136 and an overcoat layer 138 formed on the upper glass substrate 132. Here, the upper glass substrate 132 has a refractive index of 1.50.

The black matrix 136 is formed of an opaque material to define a plurality of pixel regions. Red, green, and blue color filters 134 are formed in each pixel area defined by the black matrix 136.

The overcoat layer 138 is formed to cover the black matrix 136 and the color filter 134 to planarize the upper substrate 130.

The upper substrate 110 and the upper substrate 130 are bonded through a sealant to seal the liquid crystal layer 120.

An electrostatic discharge layer 140 is formed of a conductive material on the upper substrate 130.

The antistatic layer 140 is formed to surround the upper edge of the upper substrate 130. Here, the lower outer edge of the upper substrate 130 is an area in which a sealant is applied for bonding to the lower substrate 110 and is a non-display area in which no image is displayed.

Here, the antistatic layer 140 may be formed of a transparent conductive material such as indium tin oxide (ITO) or antimony tin oxide (ATO). As another example, the antistatic layer 140 may be formed of a metal material such as nickel (Ni), molybdenum (Mo), chromium (Cr), silver (Ag), or an oxide such as magnesium oxide (MgO).

The antistatic layer 140 may have a line width similar to that of the black matrix 136 and may be formed to have a line width of 1.0 mm to 10.0 mm.

An ESD pad (not shown) is formed on the lower substrate 110, and the antistatic layer 140 and the ESD pad are electrically connected to each other.

The charges formed by the static electricity on the liquid crystal panel exit to the ground GND via the ESD pad (not shown) through the antistatic layer 140. Through this, it is possible to prevent static electricity.

In the above description with reference to FIG. 4, the antistatic layer 140 is formed to surround four sides of the upper substrate 130, but this is one of several embodiments of the present invention.

5 is a view showing an antistatic layer according to another embodiment of the present invention.

Referring to FIG. 5 (a), in another embodiment of the present disclosure, the antistatic layer 140 may be formed at one short side among four sides of the upper substrate 130.

Referring to FIG. 5B, in another embodiment of the present disclosure, the antistatic layer 140 may be formed at two short sides among four sides of the upper substrate 130.

Referring to FIG. 5C, in another embodiment of the present disclosure, the antistatic layer 140 may be formed on one long side of four sides of the upper substrate 130.

Referring to FIG. 5 (d), in another embodiment of the present disclosure, the antistatic layer 140 may be formed on both long sides of four sides of the upper substrate 130.

Referring to FIG. 5E, in another embodiment of the present disclosure, the antistatic layer 140 may be formed on one short side and one long side among four sides of the upper substrate 130.

Referring to FIG. 5 (f), in another embodiment of the present disclosure, the antistatic layer 140 may be formed on three sides of four sides of the upper substrate 130.

The antistatic layer 140 may be formed of nickel (Ni), molybdenum (Mo), chromium (Cr), and silver (Ag) having excellent conductivity, thereby improving antistatic performance. In addition, the antistatic layer 140 may be formed of a metal material having a low cost as well as expensive ITO, thereby reducing the manufacturing cost of the liquid crystal display.

In addition, since the antistatic layer 140 is formed with a thin line width only in the outer region of the upper substrate 130, even if the antistatic layer 140 is formed of expensive ITO, the manufacturing cost of the liquid crystal display may be reduced.

The conductive adhesive layer 150 is formed on the antistatic layer 140, and the polarizing film 160 is formed thereon. The antistatic layer 140 and the polarizing film 160 are bonded by the conductive adhesive layer 150.

Here, the conductive adhesive layer 150 is formed of a transparent material, and has a refractive index of 1.49 ~ 1.52.

The polarizing film 160 polarizes the light emitted from the liquid crystal panel and emits the light to the outside.

The polarizing film 160 may include a first TAC (162, Poly Vinyl Alcohol) and a second TAC (166) for controlling optical characteristics, an PSA (164, Triacetyl cellulose), an antistatic (Isotropic Film), and an isotropic film. Anti static) is composed of a protective layer (168). The polarizing film 160 has a refractive index of 1.49 to 1.52.

The first TAC 162 and the second TAC 166 have a polarization function through the stretching process. In the first TAC 162 and the second TAC 166, the space between the polymer chains in the swelling zone is widened, and in the dyeing zone, iodine is easily penetrated between the polymer chains in the dyeing zone. do.

At this time, the PVA polymer chain is oriented in the stretching zone so that the adsorbed iodine complex is stretched in a constant direction. The iodine complex, arranged in a constant direction, absorbs the light coming in its direction and polarizes the incident light.

The PVA 164, which is an isotropic film, is disposed between the first TAC 162 and the second TAC 166, and an anti static protective layer 168 is disposed on the second TAC 166. Is formed.

In addition to the antistatic treatment, the protective layer 168 may further include treatment of resolution, anti-pollution, and abrasion-resistance.

6 is a diagram illustrating a manufacturing method of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the antistatic layer 140 of the liquid crystal display according to the exemplary embodiment of the present invention may be formed on the upper substrate 130 in a printing method having a shorter time than a conventional sputtering method.

In detail, the screen mask 145 having the antistatic layer pattern formed on the upper substrate 130 is aligned, and then a conductive material is printed by the screen printing method so that the upper surface of the upper substrate 130 has an edge of 1.0 mm to 10.0 mm. An antistatic layer 140 having a line width may be formed.

At this time, the material of the antistatic layer 140 may be nickel (Ni), molybdenum (Mo), chromium (Cr), silver (Ag), magnesium oxide (MgO) having excellent conductivity. In addition, conductive transparent materials such as ITO and ATO may be used.

Meanwhile, in addition to the printing method, a line width of 1.0 mm to 10.0 mm is formed on the outer surface of the upper substrate 130 by using a metal sputter method, a gravure coating method, or a silk screen method. The branches may form the antistatic layer 140.

As such, the antistatic layer 140 may be formed on the outer surface (non-display area) of the upper substrate 130 to have a thin line width, thereby increasing the antistatic efficiency. In addition, the antistatic layer 140 may be formed of a metal material having a low cost as well as expensive ITO, thereby reducing the manufacturing cost of the liquid crystal display.

In addition, since the antistatic layer 140 is formed with a thin line width only in the outer region (non-display region) of the upper substrate 130, even if the antistatic layer 140 is formed of expensive ITO, the manufacturing cost of the liquid crystal display device may be reduced. Can be saved.

In particular, the manufacturing process may improve productivity of the liquid crystal display by forming the antistatic layer 140 in a printing method having a short tex time. In addition, the antistatic polarizing film 160 may be formed on the antistatic layer 140 to further increase the antistatic performance.

In the liquid crystal display according to the exemplary embodiment of the present invention including the above-described configuration, the polarizing film 160, n = 1.49 to 1.52, the adhesive layer 150, n = 1.49 to 1.52, and the upper glass substrate 132 and n = 1.50 There is no difference in refractive index or is formed very small.

Therefore, it is possible to prevent reflection of light incident from the outside, to prevent reflection of light incident from the backlight, to improve outdoor visibility, and to improve display quality of an image.

It will be understood by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: lower substrate 112: lower glass substrate
114: pixel array 120: liquid crystal layer
130: upper substrate 132: upper glass substrate
134: color filter 136: black matrix
138: overcoat layer 140: antistatic layer
150: conductive adhesive layer 160: polarizing film
162, 166: TAC 164: PVA
168: protective layer 145: mask

Claims (14)

A lower substrate and an upper substrate bonded together with the liquid crystal layer interposed therebetween;
An antistatic layer formed on the non-display area on the upper substrate;
A polarizing film formed on the antistatic layer; And
And a conductive adhesive layer for bonding the antistatic layer and the polarizing film to each other. The method of claim 1,
The refractive index of the polarizing film is 1.49 ~ 1.52,
The refractive index of the adhesive layer is 1.49 ~ 1.52,
And a refractive index of the glass substrate of the upper substrate is 1.50. The method of claim 1,
The antistatic layer is a liquid crystal display, characterized in that formed to have a line width of 1.0mm ~ 10.0mm. The method of claim 1,
And the antistatic layer is formed of indium tin oxide (ITO) or antimony tin oxide (ATO) material. The method of claim 1,
The antistatic layer is formed of nickel (Ni), molybdenum (Mo), chromium (Cr), silver (Ag) or magnesium oxide (MgO). The method of claim 1,
The polarizing film is a liquid crystal display, characterized in that the antistatic (Anti static) treatment. The method of claim 1,
And the lower substrate includes an electrostatic discharge (ESD) pad, and the antistatic layer and the ESD pad are electrically connected to discharge electric charges formed on the upper substrate. The method of claim 1,
And the antistatic layer is formed on at least one side of four sides of the upper substrate. In the manufacturing method of the liquid crystal display device containing an antistatic layer,
Aligning a mask in which a predetermined pattern is formed on the upper glass substrate of the liquid crystal panel;
Forming an antistatic layer on an outer surface of the upper glass substrate by a printing method using a mask, a metal sputter method, a gravure coating method, or a silk screen method;
Forming a conductive adhesive layer on the antistatic layer; And
Adhering a polarizing film subjected to an electrification treatment on the antistatic layer by using the conductive adhesive layer. The method of claim 9,
The polarizing film is formed to have a refractive index of 1.49 ~ 1.52,
It is formed to have a refractive index of 1.49 ~ 1.52 of the adhesive layer,
And a refractive index of 1.50 of the glass substrate of the upper substrate. The method of claim 9,
The antistatic layer is a liquid crystal display device, characterized in that formed to have a line width of 1.0mm ~ 10.0mm. The method of claim 9,
The antistatic layer is a method of manufacturing a liquid crystal display device, characterized in that formed of ITO (Indium Tin Oxide) or ATO (Antimony Tin Oxide) material. The method of claim 9,
The antistatic layer is formed of nickel (Ni), molybdenum (Mo), chromium (Cr), silver (Ag) or magnesium oxide (MgO) manufacturing method of a liquid crystal display device. The method of claim 9,
And the antistatic layer is formed on a non-display area of the liquid crystal panel, and is formed on at least one side of four sides of the upper glass substrate.

Images