KR20110124472A - Liquid crystal display device with a built-in touch screen and method for manufacturing the same - Google Patents

Abstract

PURPOSE: A liquid crystal display device with a touch screen and method for manufacturing method of the same are provided to prevent a metal wire which supplies a driving signal to a sensing/driving electrode for detecting a touch from corrosion. CONSTITUTION: A first and second protection layer(154,155) is orderly formed on a gate electrode(171) and a source/drain electrode(172) which is mutually exchanged on the lower substrate(150) of a liquid crystal panel. A common electrode(156) is formed on a transparent conductive material such as ITO(Indium Tin Oxide) in one part of the second protection layer.

Description

Liquid crystal display with built-in touch screen and manufacturing method therefor {LIQUID CRYSTAL DISPLAY DEVICE WITH A BUILT-IN TOUCH SCREEN AND METHOD FOR MANUFACTURING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display, and more particularly, to a liquid crystal display including a touch screen capable of preventing corrosion of metal wires and a method of manufacturing the same.

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

As a flat panel display, a liquid crystal display device, a plasma display panel, a field emission display device, and a light emitting diode display device are studied. have. Among such flat panel display devices, the liquid crystal display device has been expanded in application fields due to mass production technology, ease of driving means, high quality, and large screen.

A general liquid crystal display device includes a lower substrate and an upper substrate bonded to face each other with a liquid crystal layer interposed therebetween, and adjusts the transmittance of light passing through the liquid crystal layer of each of the plurality of pixels according to the data voltage to adjust an image signal. The image according to the display is displayed.

Recently, a touch screen that allows a user to directly input information on a screen by using a finger or a pen has been applied to replace a conventional input device such as a mouse or a keyboard as an input device of a flat panel display.

The touch screen may be a monitor such as navigation, industrial terminal, notebook computer, financial automation device, game machine or the like; Portable terminals such as mobile phones, MP3s, PDAs, PMPs, PSPs, portable game machines, DMB receivers, tablet PCs, and the like; And it has been applied to home appliances such as refrigerators, microwave ovens, washing machines, etc., the application is expanding due to the advantage that anyone can easily operate.

Recently, in applying a touch screen to a liquid crystal display, a liquid crystal display having a touch screen embedded in a liquid crystal panel has been developed for slimming.

FIG. 1 is a diagram schematically illustrating a liquid crystal display device having a built-in touch screen, and FIG. 2 and FIG. 3 are views illustrating a lower substrate and a wiring structure of a liquid crystal display device having a built-in touch screen.

1 to 3, a liquid crystal display including a general touch screen includes a lower substrate 50 and an upper substrate 60 bonded together with a liquid crystal layer (not shown) interposed therebetween. In accordance with this, the transmittance of light passing through the liquid crystal layer of each pixel is adjusted to display an image according to an image signal. Also, the touch position TS is detected using a change in capacitance Ctc according to a user's touch.

The upper substrate 60 may include a black matrix 62 defining a pixel area to correspond to each of the plurality of pixels; Red, green, and blue color filters 64R, 64G, and 64B formed in each pixel region defined by the black matrix 62; And an overcoat layer 66 formed to cover the red, green, and blue color filters 64R, 64G, and 64B and the black matrix 62 to planarize the upper substrate 60.

The lower substrate 50 includes a pixel array 40 having a plurality of pixels for driving a liquid crystal layer and detecting a touch of a user's finger or a touch of a pen.

Each of the plurality of pixels is defined by a data line (not shown) and a gate line (not shown) that cross each other, and each pixel supplies a common electrode (not shown) to which a common voltage is applied and a data voltage to the pixel. An electrode (not shown) is formed. The common electrode and the pixel electrode are formed of a transparent conductive material such as indium tin oxide (ITO).

Each of the plurality of pixels switches a thin film transistor (TFT) according to a gate signal applied through a gate line, and an electric field is formed according to a data voltage applied to the data line to drive the liquid crystal layer.

Each of the plurality of pixels detects a touch of a user's finger or a touch of a pen by driving the common electrode as a sensing / driving electrode for detecting a touch in a non-display period in which no image is displayed.

 In this case, a touch capacitance Ctc is formed between the upper substrate 60 and the common electrode of each pixel according to the touch. The touch position TS is detected by comparing the touch capacitance Ctc and the reference capacitance according to the touch, and the detected touch position is output to the outside.

As described above, the liquid crystal display having a touch screen includes a gate line and a data line for displaying an image in a display section on the pixel array 40 of the liquid crystal panel 10, and the user's touch in the non-display section. It will include a sensing / driving electrode to detect.

Due to the property of embedding the touch screen inside the liquid crystal panel 10, as shown in FIGS. 2 and 3, a driving signal (voltage) applied through the driver 90 may be applied to each line and electrode through the pad 80. It includes a plurality of metal wires 70 to supply to the has a very complicated wiring structure.

The plurality of metal wires 70 are connected to the driver 90 by a chip on glass (COG) method or a chip on flexible printed circuit (chip on film) method.

Here, the plurality of metal wires 70 are also formed outside the actual material 30 formed to surround the display area 20 of the lower substrate 50, and are formed on the plurality of metal wires 70 in a manufacturing process. Although a protective layer is formed, there are disadvantages of structural problems and physical vulnerabilities that are not completely protected from corrosion by moisture.

In particular, a metal wire that transfers a driving signal to a sensing / driving electrode for detecting a touch among the plurality of metal wires 70, that is, a sensing / driving wire is formed at an upper end of the lower substrate 50 to be vulnerable to corrosion by moisture. There is a problem.

FIG. 4 is a cross-sectional view illustrating a portion of the lower substrate of the liquid crystal display illustrated in FIG. 2 by cutting along the line AA ′. 4 shows the structure of the lower substrate used in the AH3 (FFS) method.

Referring to FIG. 4, the lower substrate 50 of the liquid crystal panel in which the conventional touch screen is embedded includes an active layer 51; A gate insulating layer 52 formed on the active layer 51; A gate electrode 71 formed of a metal material on the gate insulating layer 52 so as to overlap the active layer 51; A lower insulating layer 53 formed on the entire surface of the lower substrate 50 to insulate the gate electrode 71; And a source / drain electrode 72 formed of a metal material embedded in a trench formed to expose one side of the active layer 71 to be electrically connected to the active layer 71.

In addition, a passivation layer 54 and a second passivation layer 54 which are sequentially formed on the insulating layer 53 to cover the gate electrode 71 and the source / drain electrode 72. 55); A common electrode 56 (Vcom ITO) formed of a transparent conductive material such as indium tin oxide (ITO) on the second passivation layer 55; Sensing / driving wiring 73 formed on one side of the common electrode 56; A third protective layer 57 formed to cover the common electrode 56 and the sensing / driving wiring 73; And a pixel electrode 58 (pixel ITO) formed on one side of the third passivation layer 57 by a transparent conductive material and electrically connected to the source / drain electrode 72.

The pixel electrode 58 is formed in the trench formed by stripping the second protective layer 55 and the third protective layer 57 to expose the source / drain electrode 72.

In the liquid crystal display including the touch screen according to the related art having the above-described structure, the sensing / driving wiring 73 is eroded out of the plurality of metal wirings 70 formed outside the actual material 30 of the lower substrate 50. It is formed under the strong third passivation layer (73).

In this case, since a pin hole is formed in the third passivation layer 57 to connect the source / drain electrode 72 and the pixel electrode 58, physical weakness occurs.

The wiring connecting the liquid crystal panel and the COG or the wiring connecting the COF and the FPC uses a gate electrode 71 layer or a source / drain electrode 72 layer, and the plurality of metal wirings 70 are external to the actual material 30. When exposed to the third protective layer (57) has a disadvantage in that it is not possible to completely obtain a protective effect against sodium ions (sodium ions) or moisture.

In particular, the sensing / driving wiring 73 positioned above the lower substrate 50 among the plurality of metal wirings 70 formed on the outer side of the real material 30 may provide protection against sodium ions and moisture due to the above-described structural characteristics. There is a problem of becoming vulnerable.

When the plurality of metal wires 70 are deformed or corroded, supply of a driving signal (voltage) to the liquid crystal panel is not smoothly performed, thereby causing a problem of deterioration of display quality. In particular, when the sensing / driving wire 73 is corroded, a problem occurs in that the detection performance of the touch position is degraded.

In order to protect the sensing / driving wiring 73, the thickness of the protective layer (insulation layer) must be increased or an additional protective layer (insulation layer) must be formed. To this end, an additional process is required, thereby increasing manufacturing cost and manufacturing efficiency. This lowering is another problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and provides a liquid crystal display and a manufacturing method capable of preventing the electrical wiring and corrosion of metal wires supplying driving signals to sensing / driving electrodes for touch detection. Shall be.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and provides a liquid crystal display and a manufacturing method capable of preventing a deterioration in touch position detection performance due to corrosion and corrosion of metal wires for supplying a driving signal to a sensing / driving electrode. Let it be technical problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and reduces driving resistance and parasitic cap of a metal wiring for supplying a driving signal to a sensing / driving electrode exposed to the outside of the lower substrate. It is a technical problem to provide a liquid crystal display and a manufacturing method which can improve the margin).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and a lower substrate structure of a liquid crystal display device and a method of manufacturing the same, which can protect a metal wiring for supplying a driving signal to a sensing / driving electrode from sodium ions or moisture infiltration. To provide a technical problem.

According to an exemplary embodiment of the present invention, a liquid crystal display including a touch screen may include a first protective layer and a second protective layer sequentially formed on a gate electrode and a source / drain electrode formed to cross each other on a lower substrate of the liquid crystal panel; A common electrode formed of a transparent conductive material such as indium tin oxide (ITO) in a portion of the second passivation layer; Sensing / driving wires formed on one side of the common electrode from an outside of the liquid crystal panel to be connected to a metal electrode formed in a pixel area of the liquid crystal panel for detecting a touch of a user; A third passivation layer formed on the second passivation layer to cover the common electrode and the sensing / driving wiring; A pixel electrode formed in a portion of an upper portion of the third passivation layer to overlap the gate electrode and formed of a transparent conductive material to be electrically connected to the source / drain electrode; And a wiring protection layer formed on the third protection layer so as to overlap the sensing / driving wiring to protect the sensing / driving wiring from moisture and sodium ion infiltration.

The wiring protection layer of the liquid crystal display including the touch screen according to the embodiment of the present invention is formed together with the pixel electrode and is formed so as not to be connected to other layers (electrodes, wirings) formed on the lower substrate. It features.

The wiring protection layer of the liquid crystal display including the touch screen according to the embodiment of the present invention is maintained in a floating state so that parasitic capacitors with other layers (electrodes and wirings) formed on the lower substrate are not formed. It is characterized by.

According to an exemplary embodiment of the present invention, a method of manufacturing a liquid crystal display device having a touch screen includes a first protective layer and a second protective layer sequentially formed on a gate electrode and a source / drain electrode formed to cross each other on a lower substrate of the liquid crystal panel. Forming to; Forming a common electrode on a portion of the second passivation layer with a transparent conductive material such as indium tin oxide (ITO); Forming sensing / driving wires on one side of the second protective layer from outside of the liquid crystal panel so as to be connected to a metal electrode formed in a pixel area of the liquid crystal panel for detecting a touch of a user; Forming a third passivation layer on the second passivation layer to cover the common electrode and the sensing / driving wiring; Etching a portion of the second passivation layer and the third passivation layer to form a trench to expose the source / drain electrode, and forming a pixel electrode electrically connected to the source / drain electrode with a transparent conductive material; And a wiring protection layer formed on the sensing / driving wiring with the transparent conductive material to protect the sensing / driving wiring from moisture and sodium ion penetration when the pixel electrode is formed.

In a method of manufacturing a liquid crystal display device with a touch screen according to an embodiment of the present invention, the wiring protection layer is formed on the third protection layer so that the sensing / driving wiring is protected from moisture and sodium ion penetration. It is done.

In the method of manufacturing a liquid crystal display device with a touch screen according to an embodiment of the present invention, the common electrode is formed on the sensing / driving wiring so that the sensing / driving wiring is protected from moisture and sodium ion infiltration. do.

According to an exemplary embodiment of the present invention, the corrosion of the metal wire for supplying a driving signal to the sensing / driving electrode for touch detection can be prevented.

According to an exemplary embodiment of the present invention, a liquid crystal display and a manufacturing method capable of preventing a deterioration of touch position detection performance due to corrosion of a metal wire for supplying a driving signal to a sensing / driving electrode can be provided.

According to an exemplary embodiment of the present invention, a structure of a lower substrate of a liquid crystal display device and a method of manufacturing the same may provide a metal wiring for supplying a driving signal to a sensing / driving electrode from sodium ions or moisture intrusion. have.

According to an exemplary embodiment of the present invention, a driving margin of the liquid crystal panel 110 is reduced by reducing a resistance and a parasitic cap of a metal wire for supplying a driving signal to a sensing / driving electrode exposed to an actual outside of a lower substrate. Can improve.

According to an exemplary embodiment of the present invention, a metal wiring for supplying a driving signal to a sensing / driving electrode may be protected without the addition of an additional protective layer (insulating film) and a manufacturing process, thereby improving manufacturing efficiency and reducing manufacturing cost of the liquid crystal display. Can be.

1 is a view for schematically explaining a liquid crystal display device having a built-in general touch screen;
2 and 3 are diagrams illustrating a lower substrate and a wiring structure of a liquid crystal display in which a general touch screen is embedded.
4 is a cross-sectional view illustrating a portion of the lower substrate of the liquid crystal display illustrated in FIG. 2 by cutting along the AA ′ line.
5 is a schematic view of a liquid crystal display device with a built-in touch screen according to an embodiment of the present invention.
6 is a diagram illustrating a lower substrate and a wiring structure of a liquid crystal display with a touch screen according to an exemplary embodiment of the present invention.
FIG. 7 is a cross-sectional view illustrating a portion of the lower substrate of the liquid crystal display according to the first exemplary embodiment, taken along the line BB ′ of FIG. 6.
8 is a diagram illustrating a manufacturing method of forming a lower substrate of a liquid crystal display according to a first exemplary embodiment of the present invention.
FIG. 9 is a cross-sectional view illustrating a portion of a lower substrate of the liquid crystal display according to the second exemplary embodiment, taken along the line BB ′ of FIG. 6.
FIG. 10 is a view illustrating a manufacturing method of forming a lower substrate of a liquid crystal display according to a second exemplary embodiment of the present invention. FIG.

Hereinafter, a liquid crystal display and a manufacturing method thereof, in which a touch screen is built, according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a diagram schematically illustrating a liquid crystal display device having a touch screen according to an embodiment of the present invention, and FIG. 6 is a view illustrating a lower substrate and a wiring structure of the liquid crystal display device having a touch screen according to an embodiment of the present invention. Indicative drawing.

5 and 6, a liquid crystal display device having a touch screen according to an exemplary embodiment of the present invention includes a liquid crystal display module and a driving circuit unit for driving the liquid crystal display module.

The liquid crystal display module includes a liquid crystal panel 110 having a touch screen for detecting a touch position of a user and a backlight unit for supplying light to the liquid crystal panel 110.

The driving circuit unit generates digital image data R, G, and B by arranging image signals from the outside in units of frames, and generates driving control signals DCS and GCS of the data driver and the gate driver. ; A data driver for supplying a data signal (voltage) corresponding to an image signal to each pixel of the liquid crystal panel 110; A common voltage supply unit (not shown) for supplying a common voltage Vcom to the common electrode of the liquid crystal panel 110 and a gate driver for supplying a scan signal to each pixel of the liquid crystal panel 110; A backlight driver for driving a backlight for supplying light to the liquid crystal panel 110; And a power supply unit (not shown) for supplying driving power.

In FIG. 5, the driving circuit unit described above is formed outside the liquid crystal panel 110. However, the driving circuit unit is illustrated as an example, and all or part of the driving circuit unit may be a chip on glass (COG) or a chip on flexible printed circuit (COF). Chip On Film) may be formed on the liquid crystal panel 110.

The liquid crystal panel 110 includes an upper substrate (not shown) and a lower substrate 150 bonded together with a liquid crystal layer (not shown) therebetween, and the plurality of pixels Clc (liquid crystal cells) are arranged in a matrix form. .

The liquid crystal panel 110 displays an image according to an image signal by adjusting the transmittance of light passing through the liquid crystal layer of each pixel according to the data voltage. In addition, the touch position of the user is detected by detecting a change in capacitance according to the touch of the user.

The upper substrate (color filter array substrate) may include a black matrix (BM) defining a pixel region so as to correspond to each of a plurality of pixels; Red, green, and blue color filters formed in each pixel area defined by the black matrix; And an overcoat layer formed to cover the red, green, and blue color filters and the black matrix to planarize the upper substrate.

The lower substrate 150 (TFT array substrate) includes a pixel array 140 that drives a liquid crystal layer and has a plurality of pixels for detecting a touch using a capacitance according to a user's touch.

In addition, the lower substrate 150 includes a display area 120 in which an image is displayed and a plurality of metal wires 170 supplying a driving signal (voltage) to lines formed in the display area 120. Here, the upper substrate and the lower substrate are bonded through the material 130, and the display area 120 is shielded from the outside by the material 130.

Specifically, the lower substrate 150 includes m data lines 142 and DL1 to DLm and n gate lines 144 and GL1 to GLn, and the data lines 142 and gate lines 144. Includes a plurality of pixels Clc formed for each region defined by the intersection of the < RTI ID = 0.0 >

Each of the plurality of pixels includes a thin film transistor TFT and a storage capacitor Cst formed at an intersection of the data lines 142 and the gate lines 144.

The thin film transistor TFT supplies a data voltage supplied through the data line 142 to the pixel Clc in response to a scan signal supplied through the gate line 144.

Each of the plurality of pixels is turned on by switching the thin film transistor TFT in response to a scan signal (gate driving signal) applied through the gate line 144. Each of the turned-on pixels forms an electric field according to the data voltage and the common voltage applied through the data line 142 to drive the liquid crystal layer.

To this end, each of the plurality of pixels is formed with a pixel electrode Pixel ITO for supplying a data voltage corresponding to an image signal to the pixel, and a common electrode Vcom ITO to which a common voltage Vcom is applied. The pixel electrode and the common electrode may be formed of a transparent conductive material such as indium tin oxide (ITO).

Each of the plurality of pixels includes a sensing / driving electrode in the pixel array 140 to detect a user's touch in a non-display period in which no image is displayed. The sensing / driving electrode may serve as a common electrode for supplying a common voltage Vcom in a display period for displaying an image.

According to a user's touch, a touch capacitance Ctc is formed between the upper substrate of each pixel and the sensing / driving electrode. The touch position is detected by comparing the touch capacitance Ctc and the reference capacitance according to the touch, and the detected touch position is output to the outside.

As described above, the liquid crystal panel 110 having a touch screen includes a gate line and a data line for displaying an image in a display section and a sensing / driving electrode for detecting a user's touch in a non-display section. do. In addition, a plurality of metal wires 170 are provided to supply a driving signal (voltage) from the driver 190 to the gate line, the data line and the sensing / driving electrode.

The plurality of metal wires 170 supplies a driving signal (voltage) applied from the driver 190 to the gate line, the data line, and the sensing / driving electrode via the pad 180.

Here, the plurality of metal wires 170 may be connected to the driver 190 by a chip on glass (COG) method or a chip on flexible printed circuit (Chip On Film) method.

The plurality of metal wires 170 are also formed outside of the material 130 formed to surround the display area 120 of the lower substrate 150. The plurality of metal wires 170 are exposed to corrosion due to moisture infiltration. weak.

In particular, the sensing / driving wires connected to the sensing / driving electrodes of the plurality of metal wires 170 are formed at the upper end of the lower substrate 150, and thus are very susceptible to corrosion due to moisture infiltration and penetration of sodium ions. Done.

According to the present invention, when a pixel electrode (Pixel ITO) formed on the upper end of the upper substrate 150 is formed, a capping layer, that is, a wiring protection layer is formed of ITO on the sensing / driving wiring, thereby sensing by moisture. Corrosion of the driving wiring and penetration of sodium ions can be prevented.

FIG. 7 is a cross-sectional view illustrating a portion of a lower substrate of the liquid crystal display according to the first exemplary embodiment, taken along the line BB ′ of FIG. 6, and FIG. 8 is a liquid crystal display according to the first exemplary embodiment of the present invention. It is a figure which shows the manufacturing method of forming the lower substrate of this. 7 illustrates a lower substrate structure of a liquid crystal display device used in the AH3 (FFS) method.

Referring to FIG. 7, the lower substrate 150 of the liquid crystal panel 110 having the touch screen according to the first embodiment of the present invention may include an active layer 151; A gate insulating layer 152 formed on the active layer 151; A gate electrode 171 formed of a metal material on the gate insulating layer 152 so as to overlap a portion of the active layer 151; A lower insulating layer 153 formed on the front surface of the lower substrate 150 to insulate the gate electrode 171, an inter layer dielectric (ILD); A source / drain electrode 172 which is formed to be electrically connected to the active layer 171 by filling a metal material in the first trench T1 exposing a part of the active layer 171; First passivation layer 154 and second passivation layer 155 that are sequentially formed on the insulating layer 153 to cover the gate electrode 171 and the source / drain electrode 172. It includes. The second protective layer 155 may be formed of a photo acrylic resin.

In addition, a common electrode 156 (Vcom ITO) formed of a transparent conductive material such as indium tin oxide (ITO) in a portion of the second passivation layer 155; A sensing / driving wire 173 formed of a metal material on one side of the common electrode 156; A third passivation layer 157 formed on the second passivation layer 155 to cover the common electrode 156 and the sensing / driving wiring 173; A pixel electrode formed of a transparent conductive material, such as ITO, on a portion of the upper portion of the third passivation layer 157 so as to overlap the gate electrode 171, and electrically connected to the source / drain electrode 172. (158, Pixel ITO); And a capping layer formed on the third passivation layer 157 to overlap the sensing / driving wire 173 through the same process when the pixel electrode 158 is formed to protect the sensing / driving wire 173. That is, the wiring protection layer 159; includes.

Here, the pixel electrode 158 is formed inside the second trench T2 formed by stripping the second passivation layer 155 and the third passivation layer 157 to expose the source / drain electrode 172. 3 is formed in a portion of the upper portion of the protective layer 157.

In addition, the wiring protection layer 159 is formed so as not to be connected to other layers (electrodes, wirings) formed on the lower substrate 150 to maintain a floating state in which a signal (voltage) is not applied.

The liquid crystal display device 100 according to the first exemplary embodiment of the present invention including the lower substrate 150 formed as shown in FIG. 7 is formed at an upper end of the lower substrate 150 to prevent penetration of moisture and sodium ions. The wiring protection layer 159 may be formed of ITO on the weak sensing / driving wiring 173 to prevent the sensing / driving wiring 173 exposed to the outside of the material 130 from being transferred and corroded.

In addition, the wiring protection layer 159 maintains the floating state, thereby reducing the resistance of the sensing / driving wiring 173 exposed to the outside of the material 130, and due to another layer formed on the lower substrate 150. Parasitic caps can be reduced. Through this, the driving margin of the liquid crystal panel 110 may be improved.

Hereinafter, a method of manufacturing a liquid crystal display device having a touch screen according to a first embodiment of the present invention will be described with reference to FIG. 8.

As shown in FIG. 8 (a), after the active layer 151 is formed on one side of the lower substrate 150, the Tetra Ethyl Ortho Silicate (TEOS) or Middle Temperature Oxide (MTO) is formed on the entire surface of the lower substrate 150. ) Is deposited by chemical vapor deposition (CVD) to form a gate insulating layer 152.

Subsequently, a metal material is deposited on the gate insulating layer 152 so as to overlap the active layer 151 and then etched to form a gate electrode 171, and insulated on the entire surface of the lower substrate 150. A material is deposited to form a lower insulating layer 153 (ILD: Inter Layer Dielectric) that insulates the gate electrode 171.

Subsequently, the lower insulating layer 153 is etched to form a first trench T1 to expose a portion of the active layer 171, and a source / drain electrode is embedded by filling a metal material in the first trench T1. 172 is formed. The source / drain electrode 172 is electrically connected to the active layer 171.

Subsequently, a first passivation layer 154 is formed on the insulating layer 153 to cover the gate electrode 171 and the source / drain electrode 172.

As shown in FIG. 8B, a second passivation layer 155 is formed on the first passivation layer 154. Here, the second protective layer 155 may be formed of a photo acrylic resin.

Subsequently, a common electrode 156 (Vcom ITO) is formed of a transparent conductive material such as indium tin oxide (ITO) on a portion of the second passivation layer 155, and one side of the common electrode 156 is formed. A metal material is deposited on the substrate and then etched to form the sensing / driving wiring 173.

As shown in FIG. 8 (c), a third protective layer 157 is formed on the second protective layer 155 to cover the common electrode 156 and the sensing / driving wiring 173, and the source The second trench T2 may be formed by etching a portion of the second passivation layer 155 and the third passivation layer 157 to expose the drain electrode 172.

Subsequently, the pixel electrode 158 is formed of a transparent conductive material such as ITO in a portion of the upper portion of the third passivation layer 157 and the inside of the second trench T2. The pixel electrode 158 is electrically connected to the source / drain electrode 172.

In this case, a capping layer that protects the sensing / driving wiring 173, that is, the wiring protection layer 159 is formed using the process of forming the pixel electrode 158.

The wiring protection layer 159 is formed to overlap the sensing / driving wiring 173 on the third protection layer 157 and is connected to other layers (electrodes and wirings) formed on the lower substrate 150. It is formed so as not to maintain a floating state in which a signal (voltage) is not applied. As a result, the sensing / driving wire 173 does not generate a parasitic capacitor due to another layer formed on the lower substrate 150.

The manufacturing method of the liquid crystal display device with a touch screen according to the first embodiment of the present invention described above includes a wiring protection layer that protects the sensing / driving wiring 173 using the process of forming the pixel electrode 158. 159 may be formed.

Accordingly, the sensing driving wiring 173 for supplying a driving signal to the sensing / driving electrode of the liquid crystal panel 110 may be protected from infiltration of moisture and sodium ions without the addition of an additional protective layer (insulating film) and a manufacturing process. . Through this, it is possible to improve the manufacturing efficiency of the liquid crystal display and to reduce the manufacturing cost.

FIG. 9 is a cross-sectional view illustrating a portion of a lower substrate of the liquid crystal display according to the second exemplary embodiment of the present invention, taken along the line BB ′ of FIG. 6, and FIG. 10 is a liquid crystal display according to the second exemplary embodiment of the present invention. It is a figure which shows the manufacturing method of forming the lower substrate of this.

In the liquid crystal display according to the second exemplary embodiment of the present invention shown in FIG. 9, other configurations except for the common electrode 256 and the wiring protection layer 259 are described in the first exemplary embodiment of the present invention illustrated in FIG. The same as the liquid crystal display according to the present invention. Therefore, for the description of other configurations except for the common electrode 256 and the wiring protection layer 259, the description of the liquid crystal display according to the first embodiment of the present invention will be referred to.

Referring to FIG. 9, the lower substrate 150 of the liquid crystal panel 110 having the touch screen according to the second embodiment of the present invention may include an active layer 151; The gate insulating layer 152; The gate electrode 171; Lower insulating layer 153 (ILD); Source / drain electrodes 172; First protective layer 154; Second protective layer 155; Sensing / driving wiring 173; Common electrode 256; Third protective layer 157; The pixel electrode 158 and the pixel ITO and the wiring protection layer 259 are included.

The sensing / driving wire 173 is formed of a metal material on one side of the second protective layer 155.

The common electrode 256 is formed to cover the sensing / driving wiring 173 with a transparent conductive material such as indium tin oxide (ITO), so that the sensing / driving wiring 173 penetrates moisture and sodium It acts as a capping layer to protect against ion penetration.

The wiring protection layer 259 is formed of a transparent conductive material such as ITO through the same process when the pixel electrode 158 is formed, and the sensing / driving wiring 173 and the common wiring are formed on the third protection layer 157. It is formed to overlap the electrode 256 serves as a capping layer to protect the sensing / driving wiring 173.

Here, the wiring protection layer 259 is formed so as not to be connected to other layers (electrodes and wirings) formed on the lower substrate 150, so that a floating state in which a signal (voltage) is not applied is maintained.

The liquid crystal display device 100 according to the second embodiment of the present invention including the lower substrate 150 formed as shown in FIG.

The common electrode 256 and the wiring protection layer 259 are formed on the sensing / driving wiring 173 formed on the upper end of the lower substrate 150 by ITO on the sensing / driving wiring 173, which is vulnerable to penetration of moisture and sodium ions. Sensing / driving wiring 173 exposed to can be prevented from being eroded and corroded.

In addition, the wiring protection layer 259 maintains the floating state, so that the resistance of the sensing / driving wiring 173 exposed to the outside of the material 130 is reduced, and due to another layer formed on the lower substrate 150. Parasitic capacitors can be reduced. Through this, the driving margin of the liquid crystal panel 110 may be improved.

Hereinafter, a method of manufacturing a liquid crystal display device having a touch screen according to a second embodiment of the present invention will be described with reference to FIG. 10.

As shown in FIG. 10 (a), after the active layer 151 is formed on one side of the lower substrate 150, the Tetra Ethyl Ortho Silicate (TEOS) or Middle Temperature Oxide (MTO) is formed on the entire surface of the lower substrate 150. ) Is deposited by chemical vapor deposition (CVD) to form a gate insulating layer 152.

Subsequently, a metal material is deposited on the gate insulating layer 152 so as to overlap the active layer 151 and then etched to form a gate electrode 171, and insulated on the entire surface of the lower substrate 150. A material is deposited to form a lower insulating layer 153 (ILD: Inter Layer Dielectric) that insulates the gate electrode 171.

Subsequently, the lower insulating layer 153 is etched to form a first trench T1 to expose a portion of the active layer 171, and a source / drain electrode is embedded by filling a metal material in the first trench T1. 172 is formed. The source / drain electrode 172 is electrically connected to the active layer 171.

Subsequently, a first passivation layer 154 is formed on the insulating layer 153 to cover the gate electrode 171 and the source / drain electrode 172.

As shown in FIG. 10 (b), a second passivation layer 155 is formed on the first passivation layer 154. Here, the second protective layer 155 may be formed of a photo acrylic resin.

Subsequently, a metal material is deposited on one side of the second passivation layer 155 and then etched to form a sensing / driving wiring 173, and a portion of the second passivation layer 155 and the sensing / driving wiring are formed. A common electrode 256 (Vcom ITO) is formed on a transparent conductive material such as indium tin oxide (ITO) on 173.

Here, the common electrode 256 is formed to cover the sensing / driving wire 173, and serves as a capping layer that protects the sensing / driving wire 173 from moisture penetration and sodium ion penetration.

As shown in FIG. 10C, a third protective layer 157 is formed on the second protective layer 155 to cover the common electrode 256, and the source / drain electrode 172 is exposed. The second trenches T2 may be formed by etching portions of the second passivation layer 155 and the third passivation layer 157 so as to be etched.

Subsequently, the pixel electrode 158 is formed of a transparent conductive material such as ITO in a portion of the upper portion of the third passivation layer 157 and the inside of the second trench T2. The pixel electrode 158 is electrically connected to the source / drain electrode 172.

In this case, the wiring protection layer 259 is formed as a capping layer protecting the sensing / driving wiring 173 using the process of forming the pixel electrode 158.

Here, the wiring protection layer 259 is formed to overlap the common electrode 256 and the sensing / driving wiring 173 on the third protection layer 157, and another layer (electrode) formed on the lower substrate 150. And a floating state in which a signal (voltage) is not applied so as not to be connected to the wirings. As a result, the sensing / driving wire 173 does not generate parasitic capacitors due to other layers formed on the lower substrate 150.

According to the above-described method of manufacturing a liquid crystal display device having a touch screen, the common electrode 256 is formed on the sensing / driving wiring 173, and the pixel electrode 158 is formed. By using a process, a wiring protection layer 259 is formed on the common electrode 256 to protect the sensing / driving wiring 173. In this way, the sensing driving wiring 173 for supplying a driving signal to the sensing / driving electrode of the liquid crystal panel 110 without the addition of an additional protective layer (insulating film) and a manufacturing process is protected from penetration of moisture and sodium ions. It is possible to improve manufacturing efficiency and reduce manufacturing cost of the liquid crystal display.

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

The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: liquid crystal display 110: liquid crystal panel
120: display area 130: real
140: pixel array 142: data line
144: gate line 150: lower substrate
151: active layer 152: gate insulating layer
153: lower insulating layer 154: first protective layer
155: second protective layer 156: common electrode
157: third protective layer 158: pixel electrode
159: wiring protection layer 170: metal wiring
171: gate electrode 172: source / drain electrode
173: sensing / driving wiring 180: pad
190: driver T1, T2: trench

Claims (10)

In the liquid crystal display comprising a touch panel for detecting a user's touch,
A first protective layer and a second protective layer sequentially formed on the gate electrode and the source / drain electrode formed on the lower substrate of the liquid crystal panel;
A common electrode formed of a transparent conductive material such as indium tin oxide (ITO) in a portion of the second passivation layer;
Sensing / driving wires formed on one side of the common electrode from an outside of the liquid crystal panel to be connected to a metal electrode formed in a pixel area of the liquid crystal panel for detecting a touch of a user;
A third passivation layer formed on the second passivation layer to cover the common electrode and the sensing / driving wiring;
A pixel electrode formed in a portion of an upper portion of the third passivation layer to overlap the gate electrode and formed of a transparent conductive material to be electrically connected to the source / drain electrode;
And a wire protection layer formed on the third protection layer so as to overlap the sensing / driving wire to protect the sensing / driving wire from moisture and sodium ion intrusion. The method of claim 1,
And wherein the wiring protection layer is formed together with the pixel electrode and is not connected to other layers (electrodes and wirings) formed on the lower substrate. The method of claim 1,
And wherein the wiring protection layer is maintained in a floating state so that parasitic capacitors with other layers (electrodes and wirings) formed on the lower substrate are not formed. In the liquid crystal display comprising a touch panel for detecting a user's touch,
A first protective layer and a second protective layer sequentially formed on the gate electrode and the source / drain electrode formed on the lower substrate of the liquid crystal panel;
Sensing / driving lines formed on one side of the second protective layer from an outside of the liquid crystal panel to be connected to a metal electrode formed in a pixel area of the liquid crystal panel for detecting a touch of a user;
A common electrode formed of a transparent conductive material such as indium tin oxide (ITO) to cover a portion of the second passivation layer and the sensing / driving wiring;
A third passivation layer formed on the second passivation layer to cover the common electrode and the sensing / driving wiring;
A pixel electrode formed in a portion of an upper portion of the third passivation layer to overlap the gate electrode and formed of a transparent conductive material to be electrically connected to the source / drain electrode;
And a wire protection layer formed on the third protection layer so as to overlap the common electrode and the sensing / driving wire to protect the sensing / driving wire from moisture and sodium ion permeation. Display. The method of claim 4, wherein
And wherein the wiring protection layer is formed together with the pixel electrode and is not connected to other layers (electrodes and wirings) formed on the lower substrate. The method of claim 4, wherein
And wherein the wiring protection layer is maintained in a floating state so that parasitic capacitors with other layers (electrodes and wirings) formed on the lower substrate are not formed. In the manufacturing method of a liquid crystal display device comprising a touch panel for detecting a user's touch,
Sequentially forming a first passivation layer and a second passivation layer on the gate electrode and the source / drain electrode formed on the lower substrate of the liquid crystal panel;
Forming a common electrode on a portion of the second passivation layer with a transparent conductive material such as indium tin oxide (ITO);
Forming sensing / driving wires on one side of the second protective layer from outside of the liquid crystal panel so as to be connected to a metal electrode formed in a pixel area of the liquid crystal panel for detecting a touch of a user;
Forming a third passivation layer on the second passivation layer to cover the common electrode and the sensing / driving wiring;
Etching a portion of the second passivation layer and the third passivation layer to form a trench to expose the source / drain electrode, and forming a pixel electrode electrically connected to the source / drain electrode with a transparent conductive material; Including,
When the pixel electrode is formed, a wire protection layer is formed on the sensing / driving wire with the transparent conductive material to protect the sensing / driving wire from moisture and sodium ion penetration. Method of manufacturing the device. The method of claim 7, wherein
And wherein the wiring protection layer is formed so as not to be connected to other layers (electrodes, wirings) formed on the lower substrate in order to maintain a floating state. The method of claim 7, wherein
And wherein the wiring protection layer is formed on the third protection layer so that the sensing / driving wiring is protected from moisture and sodium ion permeation. The method of claim 7, wherein
And the common electrode is formed on the sensing / driving wiring so that the sensing / driving wiring is protected from penetration of moisture and sodium ions.

Images