KR20140116729A - Liquid crystal display device - Google Patents

Abstract

Disclosed is a liquid crystal display device module. More specifically, the present invention relates to a liquid crystal panel and the liquid crystal display device module, wherein the liquid crystal panel used in a small mobile device has the minimum risk of breakage of a substrate caused by external force and has a narrow bezel realized. According to an embodiment of the present invention, a protrusion area of a first substrate of the liquid crystal panel is minimized, and a data driving IC in the shape of a square is mounted on a flexible substrate. Therefore, breakage of the substrate and an IC caused by external force can be minimized.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal panel and a liquid crystal display module in which a breakdown of a substrate due to an external force is minimized and a narrow bezel is realized in a liquid crystal display will be.

As a flat panel display for replacing a conventional cathode ray tube display device, a liquid crystal display device, a field emission display device, a plasma display device (plasma display device) Display Panel Device) and an organic light-emitting diode (OLED) display device.

Among the flat panel display devices, the liquid crystal display device forms a plurality of switching elements on the two bonded substrates, and controls the transmissivity of light incident from the backlight unit on a pixel-by-pixel basis according to a control signal. Particularly, a liquid crystal display device is widely used not only for a large-screen TV but also for a small-sized mobile device because it can be thin and light.

1 is a view showing a liquid crystal panel provided in a conventional liquid crystal display device.

Referring to FIG. 1, a conventional liquid crystal panel 1 has a structure in which a first substrate 2 and a second substrate 3 are bonded together with a predetermined distance therebetween, and a liquid crystal material is interposed therebetween. In addition to a thin film transistor, various wirings and electrodes are formed on the first substrate 2. A color filter and a black matrix for displaying RGB colors are formed on the second substrate 3, . Particularly, one end of the first substrate 2 is bonded to the data driving IC 6 protruding from the bonding portion with the second substrate 3 to transmit a data signal to the thin film transistor therein. A flexible PCB 8 having a plurality of passive elements 8 for driving the liquid crystal panel 3 is electrically connected to the protruding region of the first substrate 2.

Although not shown, the liquid crystal panel 1 includes a backlight unit (not shown) for supplying light to the lower part, and a liquid crystal panel 1, which is coupled to the backlight unit (not shown) Of the liquid crystal display device.

Although the liquid crystal display device maintains a certain degree of rigidity due to the coupling of the mechanism structure, the liquid crystal display device is vulnerable to breakage due to external force in accordance with the increasingly smaller and thinner trend. Particularly, the liquid crystal panel 1 is expensive compared to other components such as a mechanism structure, and is not easily repaired at the time of breakage, so that breakage of the liquid crystal panel 1 can be fatal as compared with other components.

 2 is a view showing an example in which a liquid crystal panel is broken when an external force is applied to a conventional liquid crystal display device.

Referring to FIG. 2, when the external force is applied to the liquid crystal display device to cause warpage, the bonding surfaces of the two substrates 2 and 3 can maintain a certain degree of rigidity. However, Cracks occur in the form of surrounding the heat loaded with the data driving IC 6, or (c) cracks occur in the portion of the first substrate 3 A crack occurs in the form (b) in which the edge portion is separated or in the form (c) in which the data driving IC 6 is broken in the minor axis direction in accordance with the warp of the liquid crystal panel 1.

In particular, the data driving IC 6 has a plurality of output terminals, and as the resolution of the liquid crystal display device increases, the number of output terminals increases, thereby increasing the length in the major axis direction. Further, as the narrow bezel is implemented, the extending portion of the first substrate 3 is shortened, and the width in the minor axis direction becomes narrower.

Therefore, it is difficult to realize a high-resolution and narrow-bezel type liquid crystal display device due to the crack phenomenon described above.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal display device having a narrow bezel that minimizes substrate damage due to an external force in a liquid crystal display device used in a small mobile device The purpose is to provide.

A liquid crystal display device module according to an embodiment of the present invention includes: a flexible substrate on which a plurality of circuit elements are mounted; A liquid crystal panel in which first and second substrates are bonded together and liquid crystal is interposed between two substrates, and one end of the first substrate is protruded to correspond to a width of a substrate pad to which the flexible substrate is connected; A backlight unit disposed on a rear surface of the liquid crystal panel to supply light; And a mechanism structure in which the liquid crystal panel and the backlight unit are mounted.

The flexible substrate is characterized in that a data driving IC for outputting a data signal to the liquid crystal panel is mounted on one surface.

The data driving IC is characterized in that the widths are the same in the first direction and the second direction.

The data driving IC is mounted on the flexible substrate through an anisotropic conductive film (ACF).

The flexible substrate is characterized in that a plurality of output wirings for electrically connecting the data driving IC and the substrate pad are formed.

Wherein the plurality of output wirings are connected to a first output channel formed on a surface of the output channel of the data driving IC adjacent to the substrate pad; And a second substrate wiring connected to a second output terminal excluding the first output channel, wherein the first and second output wirings have the same length.

And the first output wiring has a zigzag shape.

The first output wiring has a bent shape and is formed on the flexible substrate so as to be divided into at least two layers and vertically overlapped.

The first substrate is characterized in that the corners are formed in an oblique shape.

Wherein the mechanism structure includes a guide panel for supporting a back surface of the liquid crystal panel and for supporting the backlight unit, and a lower cover on which the guide panel is mounted, wherein the flexible substrate is bent, And is disposed on the back surface of the lower cover.

In order to achieve the above object, a liquid crystal panel according to a preferred embodiment of the present invention includes: a first substrate having a first end protruded to form a panel pad; A second substrate bonded to face the first substrate; And a liquid crystal layer interposed between the first and second substrates, wherein a flexible substrate on which the data driving IC is mounted is connected to the panel pad.

The liquid crystal display device according to the embodiment of the present invention minimizes the protrusion area of the first substrate and mounts the data driving IC on the flexible substrate in a square shape to minimize the damage of the substrate and the IC from external force.

1 is a view showing a liquid crystal panel provided in a conventional liquid crystal display device.
2 is a view showing an example in which a liquid crystal panel is broken when an external force is applied to a conventional liquid crystal display device.
FIG. 3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 4 is a sectional view of the liquid crystal display device of the present invention.
5 is a view illustrating a liquid crystal panel of a liquid crystal display module according to another embodiment of the present invention.
6 is a view illustrating a connection structure of a data driving IC of a liquid crystal display according to an embodiment of the present invention.
FIG. 7A is a view showing a connection structure of a data driving IC of a liquid crystal display device according to another embodiment of the present invention, and FIG. 7B is a view showing a section taken along the line VII-VII 'of FIG.
8 is a view showing a structure in which a liquid crystal panel of a liquid crystal display module according to an embodiment of the present invention and a flexible substrate on which a data driving IC is mounted are connected using an anisotropic conductive film (ACF).

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

FIG. 3 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention, and FIG. 4 is a sectional view of the liquid crystal display device of the present invention.

3 and 4, the liquid crystal display of the present invention includes a liquid crystal panel 100 for displaying an image, a backlight unit 120 for providing light to the liquid crystal panel 100, a liquid crystal panel and a backlight unit 120 are mounted.

The liquid crystal panel 100 includes a liquid crystal layer (not shown) interposed between the array substrate 101 and the color filter substrate 102 with a predetermined distance therebetween, A driving IC 115 and a flexible substrate 119 on which circuit elements are mounted are connected.

In particular, a thin film transistor as a switching element, various wirings, a pixel, and a common electrode are formed on the array substrate 101. The thin film transistor includes a gate electrode connected to a gate wiring, a semiconductor layer formed by stacking amorphous silicon or the like on the gate electrode, a first electrode formed on the semiconductor layer and electrically connected to the data line and the data line and the pixel electrode, An electrode, and a second electrode.

In addition, the second electrode of the thin film transistor T may be connected to the storage capacitor as well as the pixel electrode of the liquid crystal capacitor.

A gate driving circuit (not shown) for providing a gate signal for driving the thin film transistor is built in a GIP (Gate In Panel) structure on one side of the array substrate 101. The gate electrode is electrically connected to a plurality of gate wirings formed in the first direction on the array substrate 101. The gate wiring is connected to the gate electrode of each thin film transistor, Are sequentially turned on for each horizontal line by a signal.

The color filter substrate 102 includes a color filter CF composed of a plurality of sub-color filters that implement colors of red, green, and blue, a color filter CF that separates each sub- And a black matrix (BM) for blocking light emitted from the light source.

 A flexible substrate 119 is connected to one end of the array substrate 101. In particular, a square-shaped data driving IC 115 is mounted on the flexible substrate 119 with similar lengths. The data driving IC 115 is electrically connected to a plurality of data lines formed in the second direction on the array substrate 101. The data lines are connected to the first electrodes of the thin film transistors, The data driving IC 115 applies a data signal to the thin film transistor and controls the light transmittance of the liquid crystal capacitor in accordance with the data signal to display an image.

In this case, according to the type of the liquid crystal panel 100, a common electrode is formed on the array substrate 101 in parallel with the pixel electrode in an in-plane switching (IPS) liquid crystal driving method, and a twisted nematic ) Liquid crystal driving method, a transparent common electrode for applying a voltage to the liquid crystal layer is formed on one surface of the color filter substrate 102.

The array and color filter substrates 101 and 102 are arranged to face each other with a sealant formed on the outer periphery of the image display area and are spaced apart from each other by a predetermined distance to constitute the liquid crystal panel 100. As shown in Fig. 4, polarizing plates 103 and 104 are attached to outer surfaces of the arrayed color filters and the color filter substrates 101 and 102, respectively, for linearly polarizing incident and output light.

The backlight unit 120 includes an LED lamp 121 and a lamp substrate 122 as a light source and a light guide plate 125 as an optical member, an optical sheet 127, and a reflection plate 129.

The LED lamp 121 includes a plurality of LED packages (not shown) arranged in a line so that the light emitting surfaces face the light guide plate 125, and are mounted inside the guide panel 116. The light guide plate 125 is disposed to correspond to the back surface of the liquid crystal panel 103 and serves to guide light incident from one surface to the liquid crystal panel 100 without any loss. The light incident on the light guide plate 125 is refracted and reflected repeatedly by the diffuser added to the inner side, proceeds to the other side, and then is emitted to the upper side of the light guide plate 125.

The LED lamp 121 described above is a point light source and includes a plurality of R, G, and B light emitting diodes (LEDs), each of which is bonded to the lamp substrate 122 and emits monochromatic light of red (R), green (Light Emitting Diode) lamp, or an LED lamp that emits white light.

In the drawing, the lamp substrate 122 and the LED lamp 121 are arranged corresponding to one side of the display panel 110, and the light is provided through the optical member.

A reflection plate 129 is provided on the back surface of the light guide plate 125 to reflect the light emitted downward and to reflect the light toward the liquid crystal panel 100 again.

The optical sheet 127 stacked on the front surface of the light guide plate 125 includes a diffusion sheet for diffusing the light emitted from the light guide plate 125 and a condenser for condensing the light diffused by the diffusion sheet, And a plurality of prism sheets for supplying uniform light to the regions.

Here, the diffusion sheet is provided, but the prism sheet includes a first prism sheet and a second prism sheet in which the prism crosses vertically in the x and y axis directions, refracts light in the x and y axis directions, . ≪ / RTI >

The liquid crystal panel 100 and the backlight unit 120 described above are combined by the mechanism structure 130 to modulate the liquid crystal display device. The mechanism structure 130 includes a guide panel 131 constituting each side face of the liquid crystal display module and a bottom cover 135 supporting the back face.

The guide panel 131 is in the form of a rectangular frame and the liquid crystal panel 100 is attached to the upper part by the shielding tape 140 while the light guide plate 125 and the plurality of optical sheets 127 are laminated inside do. The guide panel 131 may be a rectangular frame made of a synthetic resin material, which is formed by dual injection molding.

The bottom cover 135 is coupled to the back surface of the guide panel 131. Although the side surfaces of the guide panel 131 are surrounded by the side walls bent from the bottom surface of the bottom cover 135 according to the use of the liquid crystal display module, Lt; / RTI >

According to this structure, the backlight unit 120 and the guide panel 131 are mounted on the bottom surface of the bottom cover 135.

The light shielding tape 140 not only adheres and fixes the liquid crystal panel 100 and the optical sheet 127 and the guide panel 131 but also blocks the light emitted from the optical sheet 127 from leaking to the outside It also plays a role.

According to this structure, the flexible substrate 119 connected to one side of the liquid crystal panel 100 in the modularized liquid crystal display device is bent in the backward direction to minimize the bezel portion of the liquid crystal display device, And thus the data driving IC 115 mounted on the flexible substrate 119 is positioned on the back surface of the bottom cover 135.

Particularly, in the embodiment of the present invention, a data driving IC 115 mounted on a conventional array substrate (2 in Fig. 1) by a COG (chip on glass) method forms an ACF (Anisotripic Conductive Film) on a flexible substrate 119 It is possible to reduce the portion corresponding to the bezel region to the maximum extent and to prevent the liquid crystal panel 100 from being deformed even when an external force is applied to the liquid crystal panel 100 No external force acts on the data driving IC 115 disposed on the back surface of the liquid crystal display device module, so that breakage of the data driving IC 115 can be minimized.

5 is a view illustrating a liquid crystal panel of a liquid crystal display module according to another embodiment of the present invention.

5, in the liquid crystal panel 200 according to another embodiment of the present invention, the array substrate 201 and the color filter substrate 202 are adhered to each other with a predetermined distance therebetween, and a liquid crystal layer (not shown) And the data driving IC 115 and the flexible substrate 119 on which the circuit element is mounted are connected to one side of the array substrate 201 in the same manner as the liquid crystal panel 100 of FIG.

Particularly, in another embodiment, both side edge regions of the extension of one side of the array substrate 101 are formed in a chamfer shape B cut by a diagonal rather than a conventional rectangular shape.

In other words, a thin film transistor as a switching element, various wirings, pixels, and a common electrode are formed in the pixel region of the array substrate 101, and a part of the thin film transistor is extended to an extended portion to form a panel pad The wirings formed in the extended portions are formed so as to face the panel pad direction and the edge regions are left empty and the edge regions are cut together when the mother substrate separation process is performed. In addition, various wirings, electrodes, and thin film transistors formed on the array substrate 201, the color filter 202 substrate, and the two polarizing plates 203 and 204 may have the same structures as those in the above-described embodiments.

According to this structure, even if an external force acts on the liquid crystal panel 200, damage to the substrate can be minimized. In particular, breakage in the edge area of the array substrate 201 can be prevented, 155 are mounted on the flexible substrate 119 and are not affected by deformation of the liquid crystal panel 200, so that breakage is minimized.

Hereinafter, the structure of a flexible substrate connected to the liquid crystal panel of the present invention and a data driving IC mounted thereon will be described with reference to the drawings.

6 is a view illustrating a connection structure of a data driving IC of a liquid crystal display according to an embodiment of the present invention.

As shown, since the data driving IC 115 of the present invention is mounted on the flexible substrate 119 rather than being mounted on one side of the liquid crystal panel, Are formed in a square structure having almost the same length.

The data driving IC 115 applied to the liquid crystal display device is used in the form of a die rather than a normal IC package in order to minimize the thickness of the liquid crystal display device by the data driving IC, , Its durability is weaker than that of the IC in the form of a package, so that even a slight external force can easily break it.

Particularly, since the conventional data driving IC 115 having a rectangular structure has a narrow width, it is easily broken by an external force acting vertically at both ends of the long axis. However, the external force applied to the exemplified data driving IC 115 of the square structure So that the data driving IC 115 of the present invention has higher durability than the driving IC of the conventional rectangular structure.

6, the data driving IC 115 of the present invention is electrically connected to a plurality of data lines formed on a liquid crystal panel (not shown), thereby forming a plurality of channels, And is connected to the liquid crystal panel through a substrate pad 114 formed on one side of the substrate 119. The substrate pad 114 and the data driving IC 115 are connected to each other through the substrate wiring LL formed on the flexible substrate 119.

In particular, in the conventional data driver IC 115, an input channel and an output channel formed at both ends of the long axis are formed in the conventional rectangular structure. However, in the square structure according to the embodiment of the present invention, An output channel can be formed.

Further, as the output channel is formed on the vertical surface, a distance difference occurs between the output channel on the surface adjacent to the substrate pad 114 and the output channel on the vertical surface, and therefore, A difference in length occurs between the substrate wirings LL. Accordingly, a signal deviation due to the line resistance may occur between data signals to be output simultaneously to all the data lines (not shown) of the liquid crystal panel.

In order to overcome this problem, in the embodiment of the present invention, among the plurality of substrate wirings LL formed on the flexible substrate 119, the first substrate wiring (LL) connected to the output channel of the surface adjacent to the substrate pad 114, And the second substrate wirings L2 connected to the output channel formed on the other surface are different from each other in the lengths of the substrate wirings LL.

That is, when the respective substrate wirings LL are formed in a straight line and connected to the respective pads, the first substrate wirings L1 are formed to have a relatively shorter length than the second substrate wirings L2. In order to improve such a structure, in the embodiment of the present invention, the second substrate wiring L2 is formed in a linear shape and the first substrate wiring L1 is formed in a bent shape. The bend of the first substrate wiring L1 may be a zigzag shape in which the "C" shape is repeated, and the number of the bent portions may gradually increase from the periphery to the center. According to this structure, the total length of each substrate wiring LL is made substantially the same, and the signal delay problem due to the line resistance between wirings is improved.

Hereinafter, another embodiment will be described in which the problem of signal delay due to the line resistance of the substrate wiring is improved in the above-described flexible substrate with reference to the drawings.

FIG. 7A is a view showing a connection structure of a data driving IC of a liquid crystal display device according to another embodiment of the present invention, and FIG. 7B is a view showing a section taken along the line VII-VII 'of FIG.

7A and 7B, each channel of the data driving IC 315 of the present invention is connected to the liquid crystal panel through a substrate pad 314 formed on one side of the flexible substrate 319, The data driving IC 315 is connected to each other through the substrate wiring LL formed on the flexible substrate 319. [

In particular, the data driving IC 315 of the illustrated square structure may have an output channel formed on a surface perpendicular to the substrate pad 114 in addition to the surface adjacent to the substrate pad 114, and a plurality of substrate wirings (not shown) formed on the flexible substrate 319 The first substrate wiring L1 connected to the output channel of the surface adjacent to the substrate pad 314 is formed in a bent form rather than a straight line, and in order to overcome the space limitation, And the first substrate wiring L and the second substrate wiring L2 have the same length.

That is, when the respective substrate wirings LL are formed in a straight line and connected to the respective pads, the first substrate wirings L1 are formed to have a relatively shorter length than the second substrate wirings L2. Accordingly, the second substrate wiring L2 is formed in the same straight line shape as the above embodiment, and the first substrate wiring L1 is bent and the data driving IC 319 and the substrate pad 314, so that the lengths of the first and second substrate wirings L1, L2 are uniformly set.

In the drawing, wirings connected to the central channel among the first substrate wirings L1 on one surface of the data driving IC 315 are formed in the ">" As shown in Fig.

Referring to the cross section of the portion where the first substrate wiring L1 is superimposed on the upper side and the lower side, the lower wiring (not shown) connected to the central portion of the substrate pad 314 of the first substrate wiring L1 on the flexible base substrate 360 And an insulating layer 162 is formed thereon. The upper wiring 365 is connected to the outer portion of the substrate pad 314 and the upper wiring 365 is covered with the protection layer 366 in a superimposed manner with the lower wiring 361. Alternatively, the lower wiring 316 may be connected to the outer portion of the substrate pad 314, and the upper wiring 365 may be connected to the central portion.

According to this structure, the total length of each substrate wiring LL is made substantially the same, and the signal delay problem due to the line resistance between wirings is improved.

Hereinafter, a structure in which a liquid crystal panel and a flexible substrate according to an embodiment of the present invention are connected will be described with reference to the drawings.

8 is a view showing a structure in which a liquid crystal panel of a liquid crystal display module according to an embodiment of the present invention and a flexible substrate on which a data driving IC is mounted are connected using an anisotropic conductive film (ACF).

8, a panel pad 106 extending from a thin film transistor region is formed on an extension of one side of an array substrate 101 of a liquid crystal panel included in a liquid crystal display module of the present invention, (Not shown) of the substrate pad 119 is attached.

A panel pad 106 is formed on the array substrate 101 to extend the data line of the pixel region and electrically connected to the resin pad 150. The resin 150 and the resin 150 are formed on the panel pad 106, A plurality of conductive balls 152 dispersed in the ACF are attached. Further, a flexible substrate 119 on which the substrate pad 114 protrudes is attached to the upper portion of the binder.

The ACF is composed of a binder interposed between two protective films and the binder is composed of a plurality of conductive balls 152 dispersed in the resin 150 and the resin 150. In the process of attaching the flexible substrate 119, The conductive paste is applied to the panel pad 106 by removing the protective film and placing the binder on the panel pad 106. After the substrate pad 114 is disposed on the panel pad 106, the conductive ball 152 is heated and pressed using a heating bar, And to electrically connect the two pads 106, 114 as they are in contact with the substrate pad 114.

According to this structure, since the flexible substrate 119 is connected to the array substrate 101 and the data driving IC is mounted on the flexible substrate, it is not affected by the deformation of the liquid crystal panel. Here, the data driving IC can be mounted on the flexible substrate through the above-described ACF.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Accordingly, the invention is not to be determined by the embodiments described, but should be determined by equivalents to the claims and the appended claims.

100: liquid crystal panel 101: array substrate
102: color filter substrate 115: data driving IC
119: Flexible substrate 120: Backlight unit
121: LED lamp 122: LED substrate
125: light guide plate 127: optical sheet
129: reflector 130: instrument structure
131: guide panel 135: bottom cover
140: Shading tape

Claims (11)

A flexible substrate on which a plurality of circuit elements are mounted;
A liquid crystal panel in which first and second substrates are bonded together and liquid crystal is interposed between two substrates, and one end of the first substrate is protruded to correspond to a width of a substrate pad to which the flexible substrate is connected;
A backlight unit disposed on a rear surface of the liquid crystal panel to supply light; And
The mechanism structure in which the liquid crystal panel and the backlight unit are mounted
And a liquid crystal display module. The method according to claim 1,
In the flexible substrate,
And a data driving IC for outputting a data signal to the liquid crystal panel is mounted on one surface of the liquid crystal display panel module. 3. The method of claim 2,
The data driving IC includes:
And a width in the first direction and a width in the second direction are the same. 3. The method of claim 2,
The data driving IC includes:
And an anisotropic conductive film (ACF) is mounted on the flexible substrate. The method according to claim 1,
In the flexible substrate,
And a plurality of output wirings electrically connecting the data driving IC and the substrate pad are formed. 6. The method of claim 5,
Wherein the plurality of output wirings
A first substrate wiring connected to a first output channel formed on a surface of the output channel of the data driving IC adjacent to the substrate pad; And
And a second substrate wiring connected to a second output terminal excluding the first output channel,
Wherein the first and second output wirings have the same length. The method according to claim 6,
Wherein the first output wiring has a zigzag shape. The method according to claim 6,
Wherein the first output wiring includes:
Wherein the flexible substrate has a curved shape and is formed in a form of being vertically overlapped on at least two layers on the flexible substrate. The method according to claim 1,
Wherein the first substrate is formed in a shape of an oblique angle. 3. The method of claim 2,
The mechanism structure includes:
A guide panel for supporting a back surface of the liquid crystal panel and framing the backlight unit, and a lower cover on which the guide panel is mounted,
The data driving IC includes:
And the flexible substrate is disposed on a rear surface of the lower cover as the flexible substrate is bent and attached to the back surface of the lower cover. A first substrate having a first end protruded to form a panel pad;
A second substrate bonded to face the first substrate;
And a liquid crystal layer interposed between the first and second substrates,
And a flexible substrate on which the data driving IC is mounted is connected to the panel pad.

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