KR102078024B1 - Liquid crystal display device and method of fabricating thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing a liquid crystal display device.
A method of manufacturing a liquid crystal display device according to the present invention comprises the steps of: forming a liquid crystal panel by placing and bonding a first substrate and a second substrate having a size smaller than that of the first substrate to face each other; Attaching a first polarizing plate to an outer surface of the first substrate; Attaching a second polarizing plate having a size protruding by a first width along an edge of the second substrate to an outer surface of the second substrate; And positioning a cutting blade unit on the upper portion of the second polarizing plate, and cutting the edge of the second polarizing plate along a position of a second width from the edge of the second polarizing plate inward. Is composed of a first part and a second part arranged with respect to the center line, the first part has a first inclined surface and a first horizontal surface, the second part has a second inclined surface and a second horizontal surface, and the first The horizontal surface and the second horizontal surface are combined to form a blade tip having a flat cross-section that directly contacts the second polarizing plate and cuts the edge of the second polarizing plate.
Accordingly, it is possible to implement a liquid crystal display device having a more beautiful appearance design.

Description

Liquid crystal display device and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD OF FABRICATING THEREOF}

The present invention relates to a liquid crystal display device and a manufacturing method thereof, and in particular, to a liquid crystal display device that can be implemented in a lightweight and thin yet beautiful design and a manufacturing method thereof.

In accordance with the recent information age, the display field has also rapidly developed, and in response, a liquid crystal display device (LCD) and organic light emitting display device having advantages of thinning, lightening, and low power consumption. 2. Description of the Related Art A diode (organic light emitting diode) display device has excellent performance and is widely used.

Here, a liquid crystal display device (LCD), which is actively used in TVs, monitors, and mobile phones because it is advantageous for moving picture display and has a large contrast ratio, is an optical anisotropy and polarization of liquid crystal. It shows the principle of imaging by polarization.

This liquid crystal display device is a liquid crystal panel (liquid crystal panel) bonded by interposing a liquid crystal layer between two substrates (substrate) as an essential component, the electric field in the liquid crystal panel to change the arrangement direction of the liquid crystal molecules to realize the difference in transmittance do.

However, since the liquid crystal panel does not have a light emitting element, a separate light source is required to display the difference in transmittance as an image, and for this purpose, a backlight unit having a light source is disposed on the rear surface of the liquid crystal panel.

Here, the backlight unit is classified into a direct type and an edge type according to the position of the light source. In the direct type backlight unit, the light emitted from the light source is directly disposed by placing the light source under the liquid crystal panel. A method of supplying to a liquid crystal panel, and a backlight unit of a side type method indirectly injects light emitted from a light source by using refraction and reflection in the light guide plate by placing a light guide plate under the liquid crystal panel and placing a light source on at least one side of the light guide plate. It is a method of supplying to a liquid crystal panel.

At this time, the side type backlight unit not only can reduce the number of LEDs, but also has an advantage of slimming by reducing the thickness of the entire liquid crystal display device, and is a popular trend.

The liquid crystal panel and the backlight unit are modularized into a liquid crystal display module by a support main and a cover bottom, and then attached to the front of the front cover, rear cover, and front cover for storing the liquid crystal display module at the front and rear, respectively, to protect the display area. It is finally finished product by cover glass.

On the other hand, recently, the liquid crystal display device has a wide display area as the use area of the portable computer as well as the desktop computer monitor and wall-mounted television is diversified, and research is actively conducted to realize a light and thin beautiful liquid crystal display device. However, there is a problem in that there are too many components to modularize and device a liquid crystal display device.

Particularly, among the components that make up the liquid crystal display device, the front cover borders the edge of the liquid crystal display module from the front and completes the liquid crystal display module, thereby making the non-display area wider and narrowing the display area. .

In addition, it is attached to the front of the front cover and the cover glass for protecting the display area is also made of tempered glass, which acts as a factor that hinders the lightweight and thinness of the liquid crystal display device.

An object of the present invention for solving the above problems is to provide a liquid crystal display device having a beautiful design and a method of manufacturing a light weight and thin structure by omitting some of the components that make the liquid crystal display device long. Is doing.

A method of manufacturing a liquid crystal display device according to an exemplary embodiment of the present invention for achieving the above object is achieved by positioning and bonding the first substrate and the second substrate having a smaller size than the first substrate so as to face each other. Forming a panel; Attaching a first polarizing plate to an outer surface of the first substrate; Attaching a second polarizing plate having a size protruding by a first width along an edge of the second substrate to an outer surface of the second substrate; And positioning a cutting blade unit on the upper portion of the second polarizing plate, and cutting the edge of the second polarizing plate along a position of a second width from the edge of the second polarizing plate inward. Is composed of a first part and a second part arranged with respect to the center line, the first part has a first inclined surface and a first horizontal surface, the second part has a second inclined surface and a second horizontal surface, and the first The horizontal surface and the second horizontal surface are combined to form a blade tip having a flat cross-section that directly contacts the second polarizing plate and cuts the edge of the second polarizing plate.

Here, the first width and the second width may be the same.

Alternatively, the second width may be wider than the first width.

The second polarizing plate is attached to the outer surface of the second substrate using an adhesive, and after the cutting step, further comprising removing the adhesive on the surface of the second substrate exposed along the edge of the second polarizing plate It is characterized by.

In addition, the cutting blade unit is characterized in that it comprises a blade tip having a flat cross section.

At this time, the cutting step may further include the step of moving the cutting blade unit such that each edge of the second polarizing plate has one of a straight shape, a chamber shape, and a round shape. Is done.

In addition, a method of manufacturing a liquid crystal display device according to the present invention includes the steps of: forming a liquid crystal panel by placing and bonding a first substrate and a second substrate having a smaller size than the first substrate to face each other; Attaching a first polarizing plate to an outer surface of the first substrate; Attaching a second polarizing plate having a size protruding by a first width along an edge of the second substrate to an outer surface of the second substrate; Positioning a cutting blade unit on an upper portion of the second polarizing plate, and cutting an edge of the second polarizing plate along a position of a second width from the edge of the second polarizing plate inward; Disposing a backlight unit for supplying light under the liquid crystal panel; Providing a support main to support the liquid crystal panel; A cover bottom is provided to receive a backlight unit, support a support main, and place a system board in a seating groove formed in a front direction toward the liquid crystal panel; And arranging a rear cover under the cover bottom and fastening the rear cover with the cover bottom, wherein the rear cover includes a bottom portion and a vertical portion surrounding the side of the support main, and the bottom portion of the rear cover. It is characterized in that the sides are connected roundly.
And, the liquid crystal display device according to the present invention, a liquid crystal panel; A backlight unit disposed under the liquid crystal panel to supply light to the liquid crystal panel; A support main supporting the liquid crystal panel; A cover bottom having a seating groove for receiving the backlight unit, supporting the support main, and placing a system board; And a rear cover engaged with the cover bottom at the bottom of the cover bottom, wherein the rear cover includes a bottom portion, a side portion, a vertical portion surrounding the side portion of the support main body, and a horizontal portion engaged with the rear surface of the support main body. It comprises a support made, characterized in that the bottom portion and the side portion of the rear cover are connected in a round.

As described above, in the liquid crystal display device according to an exemplary embodiment of the present invention, the conventional front cover and cover glass are omitted, and the second polarizing plate exposed to the outside is manufactured and attached to a larger size than the second substrate, and then attached to a desired width. By cutting, it is possible to make the second polarizing plate appear to be more accurately aligned on the second substrate. This has the effect of having a more beautiful appearance design.

In addition, it is possible to maximize the display area by removing the width of the non-display area along the front cover, and there is an effect of providing a lightweight and thin liquid crystal display device.

At this time, by cutting the edge of the second polarizing plate by using the cutting blade unit, the damage to the second substrate and the second polarizing plate due to thermal effects that may be caused by the cutting using the laser device is prevented, and in various forms desired by the user. It has the effect of being cut off.

1 is a cross-sectional view showing a liquid crystal display device according to an exemplary embodiment of the present invention.
2 is a flowchart showing a manufacturing process of a liquid crystal display device according to an embodiment of the present invention.
3A to 3E are cross-sectional views of manufacturing steps of a liquid crystal display device according to an exemplary embodiment of the present invention.
Figure 4a is a view showing the application of the laser device as a comparative example of Figure 3d.
Figure 4b is a view showing the damage to the second substrate according to the application of the laser device of Figure 4a.
Figure 5a is a plan view for explaining a cutting blade according to an embodiment of the present invention.
5B is a view showing the area AA of FIG. 5A in more detail.
Figure 5c is a side view for explaining a cutting blade according to an embodiment of the present invention.
6A to 6C are views showing a cutting shape through the cutting blades of FIGS. 5A and 5C.

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

1 is a cross-sectional view showing a liquid crystal display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the liquid crystal display device 100 includes a liquid crystal panel 110 and a backlight unit 120, a support main 130 and a cover struggle (which modulates the liquid crystal panel 110 and the backlight unit 120). 150), and a system board 170 and a rear cover (190) for finally finalizing them.

The liquid crystal panel 110 is a part that plays a key role in image expression, and is composed of first and second substrates 112 and 114 bonded to each other with a liquid crystal layer interposed therebetween.

Here, although not shown in the drawing, a pixel is defined by a plurality of gate lines and data lines intersecting on the inner surface of the first substrate 112, which is usually called a lower substrate or an array substrate, under the premise of an active matrix method. A thin film transistor (TFT) is provided to be connected one-to-one to a transparent pixel electrode formed in each pixel.

In addition, as an example corresponding to each pixel on the inner surface of the second substrate 114 called the upper substrate or the color substrate, color filters of red (R), green (G), and blue (B) colors, and these A black matrix covering each non-display element such as a gate line, a data line, and a thin film transistor, and a transparent common electrode covering them are provided. Here, the transparent common electrode may be formed on the first substrate 112.

In addition, first and second polarizing plates 118 and 119 that selectively transmit only specific light are attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

Here, the first polarizing plate 118 has a smaller size than the first substrate 112, and may have a size that covers one edge of the first substrate 112 and a display area excluding the non-display area. Alternatively, the first polarizing plate 118 may have a size to cover the display area of the first substrate 112 and overlap one edge of the first substrate 112 and a portion of the non-display area.

The second polarizing plate 119 is exposed to the outside and is directly seen by the user, and is characterized by having a smaller size than the second substrate 114 for more elegant design and assembly convenience. In more detail, the second polarizing plate 119 may have a small size of 0.1 mm to 0.4 mm based on the four sides of the second substrate 114, but is not limited thereto, and various sizes may be adjusted. This will be described in detail later.

On the other hand, the printed circuit board 117 is connected via a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP) along at least one edge of the liquid crystal panel 110. . At this time, the printed circuit board 117, although not shown in the drawing, may be properly folded to the side of the support main 130 or the back of the cover bottom 150 during the modularization process to be in close contact.

Accordingly, the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on or off signal of the gate driving circuit transmitted through the printed circuit board 117, signals of the data driving circuit. The voltage is transferred to the corresponding pixel electrode through the data line, and accordingly, the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.

On the rear surface of the liquid crystal panel 110, a backlight unit 120 is provided to supply light to display a difference in transmittance as an image.

The backlight unit 120 includes a light source arranged along one inner surface of the cover bottom 150, a reflector plate 125, a light guide plate 123 mounted on the reflector plate 125, and a plurality of optics interposed therebetween. Sheets 121 are included.

The LED 129a is used as a light source, and each of the plurality of LEDs 129a is spaced apart at regular intervals to be mounted on the LED Printed Circuit Board (LED PCB) 129b to form the LED assembly 129. .

At this time, the LED printed circuit board 129b may correspond to a metal core printed circuit board (MCPCB) having a heat dissipation function for dissipating heat generated from a plurality of LEDs 129a.

The position of the LED assembly 129 is fixed by a method such as adhesion so that light emitted from the plurality of LEDs 129a faces the light incident portion of the light guide plate 123.

Accordingly, light emitted from the plurality of LEDs 129a of the LED assembly 129 enters the light guide plate 123 and is supplied to the liquid crystal panel 110 using refraction and reflection in the light guide plate 123.

Here, the LED housing 129 is provided with an LED housing 149 for more efficiently dissipating heat generated from each of the plurality of LEDs 129a.

At this time, the LED housing 149 is made of a metal material having excellent thermal conductivity and is located between the LED assembly 129 and the cover bottom 150, and the rear surface of the LED printed circuit board 129b and a number of LEDs 129a. It can be composed of a b-shaped vertically bent to wrap.

The reflector 125 improves the luminance of light by reflecting light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 in the shape of a square plate.

The light guide plate 123 guides the light emitted from each of the plurality of LEDs 129a to realize a higher quality surface light source.

The light guide plate 123 may have a square plate shape, and may include a pattern having a specific shape on the back surface to supply a uniform surface light source.

At this time, the pattern can be variously configured such as an elliptical pattern, a polygonal pattern, a hologram pattern, etc. to guide the light incident into the light guide plate 123. Is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

The light guide plate 123 for this can be made of polymethyl methacrylate (PMMA) or polymethacrylstyrene (MS) resin in which polymethyl methacrylate (PMMA) and polystyren (PS) are mixed. have.

The plurality of optical sheets 121 interposed on the light guide plate 123 diffuses or collects the light converted by the light guide plate 123 to a surface light source so that a more uniform surface light source is incident on the liquid crystal panel 110. .

The plurality of optical sheets 121 includes a diffusion sheet for diffusing light and a prism sheet for condensing light. At this time, only two optical sheets are shown on the drawing, but the present invention is not limited thereto and may be composed of several sheets.

The above-described liquid crystal panel 110 and the backlight unit 120 are modularized through the support main 130 and the cover bottom 150.

The support main 130 has a rectangular frame shape and surrounds the edge of the backlight unit.

At this time, the support main 130 supports the rear edge of the liquid crystal panel 110 and includes a protrusion 131 that separates the liquid crystal panel 110 from the backlight unit 120.

Here, the front of the protrusion 131 of the support main 130 supporting the rear edge of the liquid crystal panel 110 serves as a shock absorber for shock absorption and an adhesive pad 180a for suppressing the flow of the liquid crystal panel 110 , 180b). The liquid crystal panel 110 is fixed to the support main 130 by the adhesive pads 180a and 180b.

The cover bottom 150, which is the basis of the entire liquid crystal display module, has a side plate formed by vertically bending a predetermined height in a square plate shape, receiving the backlight unit 120, and storing the backlight unit 120. In support of the support main 130.

In addition, the cover bottom 150 is provided with a seating groove 152 having a predetermined depth in the front direction toward the liquid crystal panel 110 from its rear surface, and the system board 170 is seated on the seating groove 152. At this time, although not shown in the drawing, the depth of the seating groove 152 is formed to be the same as the thickness of the system board 170 or deeper, so that the system board 170 is buried in the seating groove 152, thereby forming the entire liquid crystal. The thickness of the display device 100 may be implemented slim.

Accordingly, the liquid crystal panel 110 and the backlight unit 120 have a cover bottom 150 covering the back and side surfaces of the backlight unit 120 in a state where the edges are surrounded by a support frame 130 having a rectangular frame shape from the rear. Combined, it is integrated and modularized through the support main 130.

As it is modularized as described above, light emitted from each of the plurality of LEDs 129a of the backlight unit 120 is incident on the light incident portion of the light guide plate 123 and then refracted toward the liquid crystal panel 110 therein. While passing through the plurality of optical sheets 121 together with the light reflected by the 125, it is processed into a more uniform and high-quality surface light source to be supplied to the liquid crystal panel 110.

The liquid crystal display module is finally deviced through the system board 170 and the rear cover 190 and is implemented as a finished product.

Here, the system board 170 is seated on the back surface of the liquid crystal display module, that is, the seating groove 152 formed on the back surface of the cover bottom 150.

At this time, although not shown in the drawing, the system board 170 receives an image or audio signal input from the outside and transmits it to a liquid crystal panel 110 or a speaker to convert A / D (analog / digital) to control the display or audio output. In addition, the inverter for driving the LED 129a, which is a light source of the backlight unit 120, an on-screen display (OSD) board for controlling functions related to screen adjustment, a speaker for outputting an audio signal, and a liquid crystal display device 100 as a whole Components such as an adapter for supplying power and various cables may be mounted.

The rear cover 190 is coupled to the rear of the liquid crystal display module on which the system board 170 is mounted.

The rear cover 190 wraps around the back and side surfaces of the liquid crystal display module, accommodates the system board 170 together with the liquid crystal display module, and is fixed by being assembled by fastening means 197 such as a support main 130 and a bolt. do.

The rear cover 190 for this purpose consists of a bottom portion 192 covering the rear surface of the liquid crystal display module and a side portion 194 surrounding the side surface of the liquid crystal display module and preventing the flow of the liquid crystal panel 110. In connection of the 192 and the side portion 194, the support portion 196 is vertically bent upward in the internal direction, and is externally connected in a round manner.

Here, the support portion 196 is a vertical portion that surrounds the side of the support main 130, and vertical to this, supports the rear surface of the support main 130 and is horizontal for coupling with the support main 130 through the fastening means 197. It is made of a part so that the rear cover 190 and the support main 130 can be fastened and coupled more firmly internally.

In addition, the rear cover 190 connects the bottom portion 192 and the side portion 194 roundly, so that the final appliance rear cover 190 has a more elegant exterior design and can be exposed to the user.

In addition, the end portion 194 of the rear cover 190 may form the same surface as the surface of the second polarizing plate 119 of the liquid crystal panel 110, or may form the same surface as the surface of the second substrate 114. You can.

When the liquid crystal display device 100 having such a structure is viewed from the front, it can be divided into a display unit and a blocking unit 140. The display unit corresponds to an area of the liquid crystal panel 110 that implements an image, that is, the second polarizing plate 119. The blocking unit 140 corresponds to a non-display area blocking unnecessary areas.

Here, the blocking unit 140 may be implemented in an opaque color to block unnecessary light, and may include a key assembly (not shown). At this time, the key assembly (not shown) is a key portion (not shown) located on the blocking portion 140 and a key driving portion (not shown) arranged on the rear surface of the blocking portion 140 and driving the key portion (not shown) It can be composed of. Accordingly, the key driving unit (not shown) serves to inform the selection of the key or the operation of the liquid crystal display device by allowing light to be supplied to the key unit (not shown) in response to a control signal for turning on or off the power, for example. You can.

As described above, the liquid crystal display device 100 according to the exemplary embodiment of the present invention omits the conventional front cover and cover glass, and removes the non-display area by the front cover by exposing the second polarizing plate 119 to the outside, and the width of the bezel. Can be minimized. In addition, as the number of components for manufacturing a liquid crystal display device is reduced by omitting the cover glass and the front cover, a light and thin liquid crystal display device is realized, and at the same time, the overall manufacturing cost can be reduced.

Hereinafter, a method of manufacturing a liquid crystal display device according to the present invention having the above-described configuration will be described with reference to the drawings. At this time, since the liquid crystal display device according to the embodiment of the present invention has a characteristic configuration on the liquid crystal panel 110, the manufacturing method of the liquid crystal panel 110 will be mainly described.

2 is a flowchart illustrating a manufacturing process of a liquid crystal display device according to an exemplary embodiment of the present invention, and FIGS. 3A to 3E are process sectional views of manufacturing steps of a liquid crystal display device according to an exemplary embodiment of the present invention.

First, after manufacturing each of the first substrate 112 including the array layer (not shown) and the second substrate 114 having a size smaller than the first substrate 112 and including the color filter layer (not shown) , Align the first substrate 112 and the second substrate 114 so as to face each other. And in the state of interposing a liquid crystal layer (not shown) between the first substrate 112 and the second substrate 114 to form a seal pattern along the edge of one of the two substrates 112, 114, Figure 3a As shown in the first substrate (112, 114) and the second substrate is bonded (s11).

At this time, a connecting member (not shown) such as a flexible circuit board or a tape carrier package (TCP) along the edge (non-display area) of the first substrate 112 exposed to one edge of the second substrate 114 City) may be connected to the printed circuit board (117 in FIG. 1).

Next, as shown in Figure 3b, the first polarizing plate 118 is attached to the outer surface of the first substrate 112 (s12).

Here, the first polarizing plate 118 may have a size to cover the rest of the area except the non-display area of the first substrate 112 exposed to the outside of the second substrate 114.

The first polarizing plate 118 may be attached from one edge where the side ends of the first substrate 112 and the second substrate 114 are positioned on the same line with each other, and the first polarizing plate 118 is the first substrate 112 It has a size smaller than) and is easy to attach because it is located inside the LCD.

In this case, an adhesive for attachment may be provided on one surface of the first polarizing plate 118, and the adhesive may be pressure sensitive adhesives (PSA).

Next, as illustrated in FIG. 3C, a polarizing plate 119a is attached to the outer surface of the second substrate 114 (s13).

Here, the polarizing plate 119a has a larger size than the second substrate 114, and has a size protruding by the first width w1 along the edge of the second substrate 114. At this time, one surface of the polarizing plate 119 may be provided with an adhesive for attachment, for example, pressure sensitive adhesives (PSA).

Next, as shown in FIG. 3D, the cutting blade unit 200 including the cutting blade 210 is positioned on the upper portion of the polarizing plate 119a, and is cut from the edge of the polarizing plate 119a through the cutting blade unit 200. The outer edge of the second substrate 114 by cutting (s14) the edge 119b of the polarizing plate 119a exposed to the outside of the second substrate 114 while turning one time along the position moved inward by the width 2 (w2) A second polarizing plate 119 attached to the surface is formed. At this time, the cut section of the second polarizing plate 119 may have a chamfer shape.

Here, the cutting blade unit 200 is cut by a computer numerical control (CNC) method, and has the advantage of being able to cut to have more accurate and various shapes. At this time, the cutting blade included in the cutting blade unit 200 has various shapes and can be changed or adjusted. The cutting blade 210 according to the present invention is characterized by including a blade tip having a flat cross section. This will be described in detail later.

Accordingly, the cutting blade unit 200 is rotated by a second width w2 in a direction from the edge of the polarizing plate 119a, that is, the cutting line of the polarizing plate 119a preset by a computer numerical control method. While rotating, the edge 119b of the polarizing plate 119a exposed to the outside of the second substrate 114 is cut.

Here, the second width w2 may be the same as the first width w1 or greater than the first width w1. That is, the side ends of the second polarizing plate 119 and the second substrate 114 are cut to coincide with each other, or the second substrate 114 is outside a predetermined portion of the second polarizing plate 119, for example, about 0.1 to 0.4 mm. Can be cut to expose.

As described above, the second polarizing plate 119, which is the most essential configuration of the present invention, is manufactured to have a larger size than the second substrate 114 and is attached to the second substrate 114, and then, as desired, the second edge plate 2 ( w2) The width is cut by the cutting blade unit 200. By doing so, it is possible to prevent defects that may occur during the process of aligning and attaching the second polarizing plate made of the same size as the second substrate 114 to the second substrate, and the second polarizing plate exposed to the outside is more visible. It can be made to have a beautiful appearance.

In particular, when the second polarizing plate is manufactured in a very finely smaller size than the second substrate according to the user's option, it is easy to attach when attached to the second substrate. To explain this more, if the second polarizing plate is smaller than the second substrate, alignment becomes more difficult, which causes adhesion failure and further decreases productivity and efficiency of the process.

However, according to an embodiment of the present invention, after manufacturing the second polarizing plate 119 to a size larger than the second substrate and attaching it on the second substrate, cutting the edge width of the second polarizing plate as much as desired through the cutting blade unit When removing, since the cutting width can be set freely, it is possible to manufacture a liquid crystal display device having a variety of exterior designs according to the user's option.

Meanwhile, a pressure-sensitive adhesive by the polarizing plate 119a may remain on the surface of the second substrate 114 exposed to the outside of the second polarizing plate 119.

Accordingly, by removing the adhesive exposed on the edge surface of the second substrate 114 (s15), the liquid crystal panel can be completed as shown in FIG. 3E.

On the other hand, although not shown in the drawings, after completing the liquid crystal panel, the components of the backlight unit are sequentially arranged on the cover bottom and the modularization process is performed to integrate the liquid crystal panel and the backlight unit through the support main 130 to integrate the liquid crystal display module. And finally combining the system board and the rear cover 170 to complete the liquid crystal display device.

Hereinafter, for example, a laser device as a comparative example for comparing with the cutting blade unit applied to the present invention will be described with reference to the drawings.

FIG. 4A is a view showing the application of the laser device as a comparative example of FIG. 3D, and FIG. 4B is a view showing damage to the second substrate according to the application of the laser device of FIG. 4A.

As shown in FIG. 4A, the laser device 20 is positioned on the second polarizing plate 19, and the second from the edge of the second polarizing plate 19 using the laser beam irradiated from the laser device 20. The edge 19b of the second polarizing plate exposed to the outside of the second substrate 14 may be cut along the position moved inward by the width w2.

At this time, since the laser beam emitted from the laser device 20 uses an oscillator and has a relatively high output, as shown in FIG. 4B, the second substrate 14 causes a groove or a bend on the second substrate 14, There is a problem that the surface has an uneven surface, and further reduces the rigidity of the substrate and causes cracking. In addition, a yellow band phenomenon in which the second polarizing plate 19 is damaged by heat of the laser beam and has a yellow color may be caused. If the output of the laser beam is lowered to prevent damage to the second substrate 14 and the second polarizing plate 19, cutting cannot be performed normally.

As described above, cutting by applying a laser device directly or indirectly damages the surface of the second substrate 14 together with the second polarizing plate 19 and may cause a defect in the liquid crystal panel.

On the other hand, the cutting blade unit according to an embodiment of the present invention uses a blade unlike a laser device, and does not directly or indirectly affect the second substrate, so it has the advantage of protecting and cutting the second substrate. .

The cutting blade of the cutting blade unit according to the embodiment of the present invention will be described with reference to the drawings.

5A is a plan view for explaining a cutting blade according to an embodiment of the present invention, FIG. 5B is a view showing the AA area of FIG. 5A in more detail, and FIG. 5C is a view for explaining a cutting blade according to an embodiment of the present invention It is a side view, and FIGS. 6A to 6C are views showing a cutting shape through the cutting blades of FIGS. 5A and 5C.

First, referring to FIGS. 5A and 5B, the cutting blade 210 may be divided into a first portion 201 and a second portion 203.

The first portion 201 has a first inclined surface 201a and a first horizontal plane 201b of a first length, and the second portion 203 has a second inclined surface 203a and a second horizontal second surface 203b of a second length. ).

Here, the first angle (θ1) and the center line (OL) between the center line (OL) and the first inclined surface 201 based on the center line (OL) connecting the first inclined surface 201 and the second inclined surface (203) The second angles θ2 between the second inclined surfaces 203 form the same 45 degrees.

In addition, the first horizontal surface 201b of the first portion 201 and the second horizontal surface 203b of the second portion 203 are combined to form a blade tip 205 having a flat cross section of a third length. At this time, the third length is most preferably formed to have less than 1cm, more precisely 0.66mm.

The blade tip 205 is a component that directly contacts the cutting target portion, that is, the second polarizing plate (119a in FIG. 3C) and cuts the edge of the second polarizing plate (119b in FIG. 3D).

The blade tip 205 has a flat cross-section to cut the edge of the second polarizing plate (119b in FIG. 3D), the second substrate located at the bottom of the second polarizing plate ((119 in FIG. 3D) (114 in FIG. 3D) ) To prevent damage to the image and to adjust the cutting angle at the same time, so that the cutting shape of the polarizing plate can be made freely.

In the cutting blade 210, the first portion 201 and the second portion 203 form a third angle θ3, as shown in FIG. 5C. That is, the plane of the second portion 203 is formed at a third angle with respect to the plane of the first portion 201. At this time, the third angle is preferably 15 degrees.

The cutting blade 210 may be made by coating titanium on tungsten carbide.

By applying the cutting blade 210 configured as described above to the cutting blade unit (200 in FIG. 3D), the cut edge of the second polarizing plate (119 in FIG. 3E) as the cutting target portion is straight as shown in FIG. 6A. , As shown in Figure 6b, there is an advantage that can be cut to have a variety of shapes, such as a chamfer (chamfer) shape or as shown in Figure 6c (round) shape. If the blade tip is sharp or the angles of the first part and the second part are different from those described above, it is difficult to cut the desired shape.

The embodiments of the present invention as described above are only exemplary, and a person having ordinary knowledge in the technical field to which the present invention pertains can freely deform without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes the appended claims and variations of the present invention within the scope equivalent thereto.

100: liquid crystal display 110: liquid crystal panel
112: first substrate 114: second substrate
118: first polarizing plate 119: second polarizing plate
200: cutting blade unit 210: cutting blade
205: blade tip

Claims (16)

Forming a liquid crystal panel by positioning and bonding the first substrate and the second substrate having a smaller size than the first substrate to face each other;
Attaching a first polarizing plate to an outer surface of the first substrate;
Attaching a second polarizing plate having a size protruding by a first width along an edge of the second substrate to an outer surface of the second substrate;
Positioning a cutting blade unit on the upper portion of the second polarizing plate, and cutting the edge of the second polarizing plate along a position of a second width from the edge of the second polarizing plate inward,
The cutting blade unit is composed of a first part and a second part arranged based on a center line, the first part has a first inclined surface and a first horizontal surface, and the second part has a second inclined surface and a second horizontal surface. ,
A method of manufacturing a liquid crystal display device in which the first horizontal surface and the second horizontal surface are combined to form a blade tip having a flat cross-section that directly contacts the second polarizing plate and cuts the edge of the second polarizing plate.
According to claim 1,
The manufacturing method of a liquid crystal display device, characterized in that the first width and the second width are the same.
According to claim 1,
The manufacturing method of a liquid crystal display device, characterized in that the second width is wider than the first width.
The method of claim 3,
The second polarizing plate is attached to the outer surface of the second substrate using an adhesive,
After the cutting step,
And removing the adhesive on the surface of the second substrate exposed along the edge of the second polarizing plate.
According to claim 1,
The cutting blade unit
Method of manufacturing a liquid crystal display device comprising a blade tip having a flat cross-section.
According to claim 1,
The cutting step
A method of manufacturing a liquid crystal display device further comprising the step of moving the cutting blade unit so that each edge of the second polarizing plate has one of straight, chamfer and round shapes. The method of claim 1, wherein the length of the blade tip is 1 cm or less.
The method of claim 1, wherein the first inclined surface and the second inclined surface are formed at the same angle with respect to the center line.
10. The method of claim 8, wherein an angle between the first inclined surface and the second inclined surface is 45 degrees.
Forming a liquid crystal panel by positioning and bonding the first substrate and the second substrate having a smaller size than the first substrate to face each other;
Attaching a first polarizing plate to an outer surface of the first substrate;
Attaching a second polarizing plate having a size protruding by a first width along an edge of the second substrate to an outer surface of the second substrate;
Positioning a cutting blade unit on an upper portion of the second polarizing plate, and cutting an edge of the second polarizing plate along a position of a second width from the edge of the second polarizing plate inward;
Disposing a backlight unit for supplying light under the liquid crystal panel;
Providing a support main to support the liquid crystal panel;
A cover bottom is provided to receive a backlight unit, support a support main, and place a system board in a seating groove formed in a front direction toward the liquid crystal panel; And
It consists of a step of disposing a rear cover under the cover bottom and fastening the rear cover with the cover bottom,
The rear cover includes a vertical portion surrounding a bottom portion and a side portion of the support main, and the bottom portion and the side portion of the rear cover are roundly connected to each other.
Liquid crystal panel;
A backlight unit disposed under the liquid crystal panel to supply light to the liquid crystal panel;
A support main supporting the liquid crystal panel;
A cover bottom having a seating groove for receiving the backlight unit, supporting the support main, and placing a system board; And
It is composed of a rear cover that is engaged with the cover bottom at the bottom of the cover bottom,
The rear cover includes a bottom portion, a side portion, a vertical portion surrounding the side portion of the support main, and a support portion composed of a horizontal portion engaged with the rear surface of the support main, and the bottom portion and the side portion of the rear cover are connected in a round manner. Liquid crystal display device.
The liquid crystal panel of claim 11,
A first substrate and a second substrate;
A liquid crystal layer disposed between the first substrate and the second substrate; And
And a first polarization plate and a second polarization plate attached to the first and second substrates, respectively.
The edge of the second polarizing plate is a liquid crystal display device spaced apart from the edge of the second substrate to a set width.
12. The liquid crystal display device of claim 11, further comprising fastening means for fastening the vertical portion of the support portion of the rear cover and the back surface of the support main.
The liquid crystal display device of claim 11, further comprising an adhesive pad disposed between the liquid crystal panel and the support main.
12. The liquid crystal display device of claim 11, wherein an end of the rear cover has the same surface as the surface of the second polarizing plate of the liquid crystal panel.
12. The liquid crystal display device of claim 11, wherein an end of the rear cover has the same surface as the surface of the second substrate of the liquid crystal panel.

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