KR101476852B1 - Liquid Crystal Display Device - Google Patents

Abstract

An embodiment of the present invention is a display device comprising: a display region including subpixels located on a first substrate; A second substrate spaced apart from the first substrate and including a color filter; A pad portion located on the first substrate and connected to the printed circuit board; A sealing region located between the pad region and the display region and having an adhesive member including a conductive ball for bonding the first substrate and the second substrate; A data link wiring routed from the pad region to the contact region adjacent to the display region; A data line connected to the source drain of the transistor included in the display region and routed to the contact region adjacent to the display region and located on the upper layer than the data link wiring and spaced apart from the data link wiring; And a contact electrode which is located in the contact region and electrically connects the data line and the data line which are located in different layers.

Liquid crystal display device, contact, conductive ball

Description

[0001] The present invention relates to a liquid crystal display device,

An embodiment of the present invention relates to a liquid crystal display device.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, a flat panel display (FPD) such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and a plasma display panel (PDP) Usage is increasing. Among them, liquid crystal display devices capable of realizing high resolution and capable of not only miniaturization but also enlargement are widely used.

A liquid crystal display device is classified into a light receiving display device. A liquid crystal display device can display an image by receiving a light source from a backlight unit located below a liquid crystal panel. Such a liquid crystal display device includes a liquid crystal panel composed of a color filter substrate and a transistor array substrate, and a backlight unit for providing light to the liquid crystal panel. In the case of a liquid crystal panel included in a liquid crystal display, a driving signal is supplied from a driving unit. The driving unit may include a data driver for supplying a data signal to the liquid crystal panel and a gate driver for supplying a gate signal.

On the other hand, in the case of TN (Twisted Nematic) mode among the conventional liquid crystal display devices, the silver dotting is fixed to transmit the voltage to the common electrode formed on the color filter substrate. However, when shutdown cross talk The problem was replaced by the use of adhesive members containing conductive balls. However, in the case of a method using an adhesive member, when a pressure is applied to a sealing region where an adhesive member is formed for joint sealing of a color filter substrate and a transistor array substrate, a common electrode formed on the color filter substrate via a conductive ball included in the adhesive member, There is a problem that short-circuiting occurs between the data link wirings formed on the array substrate, and improvement thereof is required.

An embodiment of the present invention for solving the above problems of the background art provides a TN (Twisted Nematic) mode liquid crystal display device capable of preventing a short circuit between a common electrode and a data link wiring to solve a display failure problem of a liquid crystal panel .

According to an embodiment of the present invention, there is provided a display device including: a display region including subpixels located on a first substrate; A second substrate spaced apart from the first substrate and including a color filter; A pad portion located on the first substrate and connected to the printed circuit board; A sealing region located between the pad region and the display region and having an adhesive member including a conductive ball for bonding the first substrate and the second substrate; A data link wiring routed from the pad region to the contact region adjacent to the display region; A data line connected to the source drain of the transistor included in the display region and routed to the contact region adjacent to the display region and located on the upper layer than the data link wiring and spaced apart from the data link wiring; And a contact electrode which is located in the contact region and electrically connects the data line and the data line which are located in different layers.

The subpixel includes a gate located on the first substrate, a first insulating film located on the gate, an active layer located on the first insulating film, a source drain in contact with the active layer, A second insulating film, and a pixel electrode that is disposed on the second insulating film and is in contact with a source or a drain.

A first insulating film is located on the data link wiring, and a second insulating film is located on the first insulating film.

A common electrode to which a common voltage is supplied is disposed on the second substrate, and the adhesive member may be positioned between the common electrode and the second insulating film.

The data link wiring may be formed as a gate, and the data wiring may be formed as a source drain.

The gate and the source drain may be formed from the same metal material.

The contact electrode may be formed of the same material as the pixel electrode included in the subpixel.

The second substrate may include a black matrix, a color filter disposed between the black matrix, and a common electrode located on the color filter.

An embodiment of the present invention has an effect of providing a TN (Twisted Nematic) mode liquid crystal display device capable of preventing a short circuit between a common electrode and a data link wiring, thereby solving the display failure problem of the liquid crystal panel. In addition, the embodiment of the present invention can solve the problem of line defect due to a short circuit, thereby improving the production yield and reliability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a liquid crystal display device.

1, the liquid crystal display device may include a liquid crystal panel 130, a driver 189, and a backlight unit 179. [

The liquid crystal panel 130 may have a structure in which a first substrate 110 on which a transistor array is formed and a second substrate 120 on which a color filter is formed are bonded together with a liquid crystal layer interposed therebetween. In this liquid crystal panel 130, subpixels independently driven by transistors are arranged in a matrix, and each of the subpixels has a difference voltage between a common voltage supplied to the common electrode and a data signal supplied to the pixel electrode connected to the transistor An image can be displayed by controlling the light transmittance by controlling the liquid crystal array.

The backlight unit 179 may include a cover bottom 180, a lamp 171, a diffusion plate 172, a diffusion sheet 173, an optical sheet 174, a protective sheet 175, and the like. In the case of the lamp 171, a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL), a light emitting diode A light emitting diode (LED), and the like. In the case of the optical sheet 174, a sheet such as a prism, a lenticular lens, a microlens, or the like may be used, but is not limited thereto.

The driving unit 189 includes a plurality of film circuits 140 connected to one side of the first substrate 110 by mounting a driving chip 150 for supplying driving signals to the data lines and gate lines connected to the liquid crystal panel 130, And a printed circuit board 188 connected to the first substrate 110. The pad portions formed on the plurality of film circuits 140 may include a pad portion formed on the printed circuit board 188 and a pad portion formed on the first substrate 110 to electrically connect the printed circuit board 188 and the first substrate 110 Respectively. In this way, the film circuit 140 on which the driving chip 150 is mounted can be positioned by COF (Chip On Film) or TCP (Tape Carrier Package) method. However, the driving chip 150 may be directly mounted on the first substrate 110 by a COG (Chip On Glass) method, or may be formed on the first substrate 110 in the transistor forming process.

The liquid crystal panel 130 and the backlight unit 179 for displaying abnormal images can be accommodated by the cover top 190 and the cover bottom 180. [ The cover top 190 can accommodate the liquid crystal panel 130 and the cover bottom 170 can accommodate the backlight unit 179. On the other hand, the liquid crystal panel 130 may be positioned on the backlight unit 179 at a predetermined interval. The liquid crystal panel 130 and the backlight unit 179 can be fixed and protected by the cover top 190 fastened to the cover bottom 180. [ Here, an opening for exposing the image display region of the liquid crystal panel 130 may be provided on the upper surface of the cover column 190.

The liquid crystal panel 130 described above can display an image in each sub-pixel according to a scan signal supplied through gate wirings and a data voltage supplied through the data lines. The scan signal may be a pulse signal that alternates between a gate high voltage supplied during one horizontal period and a gate low voltage supplied during the remaining period, but is not limited thereto.

The transistor included in the subpixel may be turned on when a gate high voltage is supplied from the gate wirings to supply the data voltage applied from the data wirings to the liquid crystal layer. Accordingly, when a transistor of each sub-pixel is turned on and a data voltage is applied to the pixel electrode, the liquid crystal display can display an image while the difference voltage between the data voltage and the common voltage is charged in the liquid crystal layer.

On the other hand, when the gate line voltage is supplied from the gate lines, the data voltage charged in the liquid crystal layer can be maintained by the storage capacitor for one frame period while the transistor is turned off. On the other hand, the liquid crystal panel 130 may repeat a different operation depending on a scan signal supplied through gate wirings.

Hereinafter, the liquid crystal panel will be described.

2 is a cross-sectional view of the liquid crystal panel. FIG. 2 is only intended to aid understanding of the liquid crystal panel, but the liquid crystal panel according to the embodiment of the present invention is not limited thereto.

Referring to FIG. 2, the liquid crystal panel may have a structure in which a liquid crystal layer 125 positioned between the first substrate 110 and the second substrate 120 is interposed therebetween.

A gate 111 may be located on one side of the first substrate 110. The gate 111 may be formed of any one selected from the group consisting of molybdenum (Mo), aluminum (Al), chrome (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd) Or an alloy thereof. The gate 111 is formed of a material selected from the group consisting of Mo, Al, Cr, Au, Ti, Ni, Ne, And may be a multilayer composed of any one selected or an alloy thereof. In addition, the gate 111 may be a double layer of molybdenum / aluminum-neodymium or molybdenum / aluminum.

The first insulating layer 112 may be located on the gate 111. The first insulating layer 112 may be a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or a multilayer thereof, but is not limited thereto.

The active layer 114a located in the region corresponding to the gate 111 may be located on the first insulating layer 112 and the ohmic contact layer 114b which lowers the contact resistance may be located in the active layer 114a have. In addition, the data pad 113 to which the data voltage is supplied may be disposed on the first insulating layer 112, but the present invention is not limited thereto.

The source 115 and the drain 116 may be located on the active layer 114a. The source 115 and the drain 116 may be formed of a single layer or multiple layers and may be formed of a single layer of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). When the source 115 and the drain 116 are multi-layered, they may be formed of a triple layer of molybdenum / aluminum-neodymium, molybdenum / aluminum / molybdenum or molybdenum / aluminum-neodymium / molybdenum.

The second insulating film 117 may be located on the source 115 and the drain 116. [ The second insulating film 117 may be a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer thereof, but is not limited thereto. The second insulating film 117 may be a passivation film.

A pixel electrode 118 connected to the source 115 or the drain 116 may be disposed on the second insulating layer 117. The pixel electrode 118 may be one of indium tin oxide (ITO), indium zinc oxide (IZO), and zinc oxide (ZnO).

A common electrode (not shown) may be disposed on the second insulating layer 117 to face the pixel electrode 118. The common electrode may be positioned on the first substrate 110 or the second substrate 120 according to a driving method.

A spacer 119 for maintaining a cell gap with the second substrate 120 may be positioned on the second insulating layer 117 located on the first substrate 110 and corresponding to the source 115 and the drain 116 have.

The black matrix 121 may be positioned on one side of the second substrate 120. The black matrix 121 may be positioned so as to correspond to an area where the spacer 119 is located as a non-display area. The black matrix 121 is made of a photosensitive organic material to which a black pigment is added, and carbon black, titanium oxide, or the like can be used as the black pigment.

The color filters 120R, 120G, and 120B may be disposed between the black matrixes 121. [ The color filters 120R, 120G, and 120B may have different colors as well as red 120R, green 120G, and blue 120B.

The overcoat layer 122 may be positioned on the black matrix 121 and the color filters 120R, 120G, and 120B. The overcoat layer 122 may be omitted depending on the structure of the second substrate 120 on which the black matrix 121 and the color filters 120R, 120G, and 120B are formed.

A common electrode 123 to which a common voltage is supplied may be disposed on the overcoat layer 122. The common electrode 123 may be an electrode for controlling the liquid crystal layer 125 together with the pixel electrode 118 and may be located on the first substrate 110 depending on the structure.

3 is a partially exploded perspective view of the liquid crystal panel.

Referring to FIG. 3, a liquid crystal panel has a display area AA including subpixels. A data driver 189a is connected to one side of the first substrate 110 where the display area AA is located and a gate driver 189b is connected to the other side of the first substrate 110. [ However, the gate driver 189b may be mounted on the first substrate 110 according to the structure, but the gate driver 189b may be connected to the first substrate 110 in the embodiment of the present invention.

The data driver 189a includes a first film circuit 140a mounted with a data driving chip 150a for supplying a data signal to a data line connected to sub pixels included in a display area AA located on the first substrate 110, And a first printed circuit board 188a. The gate driver 189b is connected to a second film circuit (not shown) mounted with a gate driving chip 150b for supplying a gate signal to the gate wiring connected to the subpixel included in the display area AA located on the first substrate 110 140b and a second printed circuit board 188b. The first film circuit 140a and the data wiring can be electrically connected through the data link wiring 111a extending from the pad region where the pad portion with the first film circuit 140a is located, 140b and the gate wiring can be electrically connected through the gate link wiring 111b extending from the pad region where the pad portion with the second film circuit 140b is located.

Hereinafter, an embodiment of the present invention will be described with reference to an enlarged view of part of FIG.

Fig. 4 is an enlarged view of the data link wiring portion shown in Fig. 3, and Fig. 5 is a sectional view of the contact region.

4 and 5, a data pad sub-area PDA, a sealing area SL, a data link interconnection area DLA, a contact area CA, and a display area AA are shown.

The data pad region PDA indicates a region adjacent to the pad portion to which the first film circuit 140a is connected and the sealing region SL bonds the first substrate 110 and the second substrate 120, The data link wiring area DLA represents a region where the data link wiring is routed and the contact area CA represents an area where the data link wiring and the data wiring are electrically connected to each other , And the display area AA indicates an area where the subpixels are located.

The data wiring line 111a is routed from the data pad sub-area PDA to the display area AA and the adjacent contact area CA and the data line 115 is routed to the source or the drain of the transistor included in the display area AA Drain and is routed to the contact area CA adjacent to the display area AA. Here, since the data link wiring 111a is formed on the first substrate 110, the first insulating film 112 and the second insulating film 117 are positioned on the data link wiring 111a. Alternatively, the data line 115 may be formed on the first insulating layer 112 located on the first substrate 110, so that the data line 115 is located on the upper layer than the data link line 111a and the second insulating layer 117). In this manner, the data link wiring 111a and the data wiring 115 routed to the contact region CA are formed in different layers and are spaced apart from each other, but are electrically connected by the contact electrode 118. [

Here, the data link wiring 111a may be formed of a gate constituting a transistor, and the data wiring may be formed of a source drain constituting a transistor. In this case, the gate and the source drain constituting the transistor may be formed of the same metal material. Here, the contact electrode 118 may be formed of the same material as the pixel electrode included in the sub-pixel.

Hereinafter, an embodiment of the present invention is compared with the prior art with reference to a cross-sectional view of a sealing region.

6 is a diagram for comparing an embodiment of the present invention with a conventional art.

Fig. 6 (a) shows a conventional technique, and Fig. 6 (b) shows an embodiment of the present invention.

Referring to the prior art shown in Fig. 6 (a), the data link wiring 111a passing through the sealing region is located on the active layer 114a. 6B, the data link wiring 111a passing through the sealing region is located under the first insulating film 112 and the second insulating film 117. In this case, as shown in FIG.

In the sealing region, the adhesive member 160 including the conductive balls 165 is positioned as described above. The adhesive member 160 may be formed by bonding and sealing the first substrate 110 and the second substrate 120 together with a common electrode (not shown) disposed on the second substrate 120 using the conductive balls 165 included therein 123 are electrically connected to the first substrate 110 so that a common voltage can be supplied to the first substrate 110. [ When the first substrate 110 and the second substrate 120 are jointly sealed, a pressure for joining is applied around the sealing region.

In the prior art shown in FIG. 6A, only the second insulating film 117 is located on the data link wiring 111a. Therefore, in the conventional technique, when a defect F occurs in which a pressure for joining a substrate acts on the sealing region and the conductive ball 165 penetrates through the second insulating film 117, A short circuit may occur between the data link wiring line 123 and the data link wiring line 111a. That is, since the thickness of the insulating film capable of protecting the data link wiring 111a is not sufficient in the conventional art, the short circuit between the common electrode 123 and the data link wiring 111a via the conductive balls 165 There is a high risk of line defects.

6 (b), the second insulating film 117 and the first insulating film 112 are located on the data link wiring 111a. Therefore, even if a defect (F) occurs in which the pressure for bonding the substrate to the substrate is applied to the sealing region and the conductive ball 165 penetrates through the second insulating film 117, 123 and the data link wiring 111a can be insulated. That is, in the embodiment, since the thickness of the insulating film that can protect the data link wiring 111a is structurally sufficient, it is possible to prevent a short circuit caused by the conductive balls 165 (or conductive foreign matter), thereby eliminating the risk of line defects can do.

As described above, according to the embodiment of the present invention, a TN (Twisted Nematic) mode liquid crystal display device capable of preventing a short between the common electrode formed on the second substrate and the data link wiring formed on the first substrate, Can be provided. In addition, the embodiment of the present invention can solve the problem of line defect due to a short circuit, thereby improving the production yield and reliability.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1 is an exploded perspective view of a liquid crystal display device;

2 is a cross-sectional view of a liquid crystal panel;

3 is a partially exploded perspective view of a liquid crystal panel;

Fig. 4 is an enlarged view of the data link wiring portion shown in Fig. 3; Fig.

5 is a cross-sectional view of a contact region;

6 is a diagram for comparing an embodiment of the present invention with the prior art.

DESCRIPTION OF THE REFERENCE NUMERALS

110: first substrate 120: second substrate

130: liquid crystal panel 112: first insulating film

117: second insulating film 111a: data link wiring

123: common electrode 160: bonding member

165: Challenge Ball

Claims (8)

A semiconductor device, comprising: a gate located on a first substrate; a first insulating film located on the gate; an active layer located on the first insulating film; a source drain in contact with the active layer; A display region including a second insulating film, and a sub-pixel located on the second insulating film and including a pixel electrode contacted with the source or drain; A second substrate spaced apart from the first substrate and including a color filter; A pad portion located on the first substrate and connected to the printed circuit board; A sealing region located between the pad region and the display region and having an adhesive member including conductive balls for bonding the first substrate and the second substrate; A data link wiring routed from the pad region to the contact region adjacent to the display region; A data line which is connected to a source drain of the transistor included in the display region and is routed to the contact region adjacent to the display region and is located on an upper layer than the data link wiring and is spaced apart from the data link wiring; And And a contact electrode which is located in the contact region and electrically connects the data wiring line and the data line, which are located in different layers, Wherein the first insulating film is located on the data link wiring, the second insulating film is located on the first insulating film, A common electrode to which a common voltage is supplied is disposed on the second substrate, and the bonding member is positioned between the common electrode and the second insulating film. delete delete delete The method according to claim 1, The data link wiring is formed of the gate, And the data line is formed of the source drain. The method according to claim 1, The gate and the source drain are connected to each other, And is made of the same metal material. The method according to claim 1, The contact electrode may include: And the pixel electrode is formed of the same material as the pixel electrode included in the subpixel. The method according to claim 1, The second substrate may include: With the black matrix, The color filter positioned between the black matrixes, And a common electrode disposed on the color filter.

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