KR101481674B1 - Display device having touch panel - Google Patents

Abstract

The present invention provides a display device having a touch panel that can effectively prevent a malfunction of a touch sensor by effectively blocking a noise component from a display device.
A display device having a touch panel of the present invention comprises: a display device; A touch panel attached to the display device through an adhesive layer; A noise blocking layer formed entirely on a rear surface of the touch panel and made of a transparent conductive layer for blocking an electric noise component from entering the touch panel from the display device; A metal ring pattern formed on the noise blocking layer so as to surround an outer region of the noise blocking layer and having a lower electrical resistance than the transparent conductive layer; And a ground terminal electrically connected to the noise blocking layer and the metal ring pattern.

Description

DISPLAY DEVICE HAVING TOUCH PANEL [0002]

The present invention relates to a display device having a touch panel, and more particularly, to a display device having a touch panel capable of effectively preventing a noise component from a display device and preventing a malfunction of the touch panel.

2. Description of the Related Art Today, a touch screen capable of inputting information by touching on the screen of various display devices is widely applied as an information input device of a computer system. The touch screen allows the user to easily use the touch screen by simply touching the screen with a finger or a stylus to move or select the display information.

The touch screen senses the touch and touch positions generated on the screen of the display device, outputs the touch information, and the computer system analyzes the touch information and executes the command. As a display device, a flat panel display device such as a liquid crystal display device, a plasma display panel, and an organic light emitting diode display device is mainly used.

The touch screen technology has a resistance film type, a capacitive type, an infrared type, an ultrasonic type, and an electromagnetic type depending on the sensing principle. Among them, the resistive film type and the electrostatic capacity type are widely used because they are advantageous from the viewpoint of manufacturing cost.

The resistive touch screen recognizes the touch by detecting the voltage change caused by touching the upper and lower resistive film (transparent conductive film) by the touch pressure. However, in the resistive touch screen, the touch screen or display device is easily damaged due to the touch pressure, and the light transmittance is low due to the light scattering effect of the air layer between the resistive films.

The capacitive touch screen, which can compensate for the disadvantages of the resistive type, recognizes the touch by sensing a change in capacitance caused by a small amount of charge moving to the touch point when a conductor such as a human body or a stylus is touched. The capacitive touch screen can use tempered glass, which is durable, has high transmittance, excellent touch sensing ability, and has attracted attention because it can be multi-touchable.

Generally, the touch screen is manufactured in the form of a panel and attached to the upper part of the display device to perform a touch input function. However, in a display device having a touch panel, there is a problem that a touch sensor in the touch panel malfunctions due to a noise component generated from a display device, that is, electro-magnetic interference (EMI) caused by static electricity.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device having a touch panel capable of effectively preventing a malfunction of a touch sensor by effectively blocking a noise component from a display device, .

According to an aspect of the present invention, there is provided a display device having a touch panel, including: a display device; A touch panel attached to the display device through an adhesive layer; A noise blocking layer formed entirely on a rear surface of the touch panel and made of a transparent conductive layer for blocking an electric noise component from entering the touch panel from the display device; A metal ring pattern formed on the noise blocking layer so as to surround an outer region of the noise blocking layer and having a lower electrical resistance than the transparent conductive layer; And a ground terminal electrically connected to the noise blocking layer and the metal ring pattern.

The touch panel includes a lower substrate on which the noise blocking layer, the metal ring pattern, and the ground terminal are formed, and a capacitive touch sensor formed on an inner surface of the lower substrate; And a cover substrate formed on the touch sensor.

A display device having a touch panel of the present invention includes: a circuit film electrically connected to the touch sensor and a touch controller for driving the touch sensor; And a circuit film extension unit connected to the ground terminal formed on the back surface of the lower substrate, the substrate film being bent along the side surface of the lower substrate from the inner side surface of the lower substrate.

The circuit film extension portion is formed to be wider than a second portion where a width of a first portion connected to the ground terminal is bent along a side surface of the lower substrate

The metal ring pattern and the ground terminal are integrally formed by the same metal layer.

And at least one metal line formed on the noise blocking layer and electrically connected to the metal ring pattern.

When the display device is a liquid crystal display device, the at least one metal line is formed on the black matrix layer of the liquid crystal display device along the gate line direction of the liquid crystal display device.

The line width of the at least one metal line is formed to be 1 탆 to 3 탆.

A display device having a touch panel according to the present invention includes a metal ring pattern having a low electrical resistance formed in a peripheral portion of a noise barrier layer formed of a transparent conductive layer on the entire surface between a touch panel and a display device, It is possible to quickly discharge the noise component from the display device through the ground terminal, regardless of the state of the ground terminal.

Accordingly, it is possible to effectively prevent the malfunction of the touch sensor by effectively blocking the noise component from the display device, and by expanding the driving range of the sensing signal due to the reduction of the noise component flowing into the touch controller, the recognition rate for sensing the sensing signal can be improved .

In addition, since at least one metal line is formed on the noise blocking layer by being aligned with the black matrix layer formed in the gate line direction of the display device, the resistance reduction and uniformity of the touch panel can be improved without adversely affecting the visibility of the display device .

1 is a schematic view showing a vertical section of a display device having a touch panel according to a first embodiment of the present invention.
2A and 2B are diagrams showing discharge paths of noise components according to the presence or absence of the metal ring pattern according to the first embodiment of the present invention.
3 is a plan view showing an electrode structure for a part of the capacitive touch sensor shown in FIG.
4 is a cross-sectional view showing the connection structure between the FPC shown in Fig. 3 and the ground terminal located on the back surface of the touch panel.
5 is a rear view of a touch panel showing a metal ring pattern and a metal line formed in the noise blocking layer according to the second embodiment of the present invention.

1st Example

FIG. 1 is a schematic vertical cross-sectional view of a display device having a touch panel according to a first embodiment of the present invention. FIGS. 2a and 2b are cross-sectional views of the display device according to the first embodiment of the present invention, Fig. 7 is a view showing a discharge path of a noise component.

1, a display device having a touch panel according to a first embodiment of the present invention includes a display device 40, a touch panel 40 attached to the surface of the display device 40 by an adhesive layer 30, (10).

As the display device 40, a flat panel display device such as a liquid crystal display device, a plasma display panel, and an organic light emitting diode display device is mainly used. For example, when a liquid crystal display is used as the display device 40, the liquid crystal display device includes a color filter substrate on which a color filter array is formed, a thin film transistor substrate on which a thin film transistor array is formed, And a polarizing plate attached to the outer surfaces of the color filter substrate and the thin film transistor substrate, respectively. The liquid crystal display device displays an image by driving the liquid crystal layer with a horizontal electric field or a vertical electric field according to an image signal.

A transparent adhesive layer 30 is applied to the front surface of the display device 40 and the touch panel 10 is attached to the display device 40 through the adhesive layer 30. As the adhesive layer 30, an optical elastic resin such as SVR (Super View Resin) which is an acrylic ultraviolet curable resin is used. SVR improves visibility and has impact resistance.

The touch panel 10 includes a touch sensor 14 formed on a lower substrate 18 and a cover substrate 12 disposed on an upper portion of the touch sensor 14. As the lower substrate 18 and the cover substrate 12, glass or a transparent polymer material is used. As the cover substrate 12, a tempered glass having high durability can be used. The touch panel 10 uses a capacitive touch sensor 14 that senses a change in capacitance caused by a small amount of charge moving to a touch point when a conductor such as a human body or a stylus is touched to recognize the touch. The touch sensor 14 is electrically connected to a touch controller mounted on the FPC through a circuit film such as an FPC (Flexible Print Circuit). The touch controller supplies a driving signal to the touch sensor 14 and inputs a sensing signal from the touch sensor 14 to determine whether or not the touch is made and the touch position.

The touch panel 10 is provided on the back surface of the touch panel 10 and between the touch panel 10 and the display device 40. The touch panel 10 is provided with a noise blocking function for blocking the noise radiated from the display device 40 from entering the touch panel 10, A layer 18 is formed over the entire surface. The noise blocking layer 18 is formed by depositing a transparent conductive layer on the back surface of the touch panel 10, that is, on the outer surface of the lower substrate 18 by using a deposition method such as sputtering or CVD (Chemical Vapor Doposition) do. As the transparent conductive layer, a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Tin Oxide), ITZO (Indium Tin Zinc Oxide), or ATO (Antimony Tin Oxide) is used.

The noise blocking layer 18 is electrically connected to the ground terminal 22 as shown in Figs. 2A and 2B. The ground terminal 22 is connected to the ground power source through the FPC. The noise blocking layer 18 discharges the noise component emitted from the display device 40 to the noise blocking layer 18 toward the ground terminal 22 so that the noise component from the display device 40 The touch panel 10 is blocked. The noise blocking layer 18 is formed entirely on the rear surface of the lower substrate 16 so that the noise blocking layer 18 is formed on the rear surface of the lower substrate 16, Can be blocked.

2B, a metal ring pattern 20 having a lower electrical resistance than the noise blocking layer 18 is further formed on the periphery of the noise blocking layer 18 in order to shorten the discharge delay time of the noise component. The metal ring pattern 20 serves to rapidly discharge a noise component electrically connected to the ground terminal 22 together with the noise blocking layer 18 and discharged from the noise blocking layer 18 toward the ground terminal 22. The metal ring pattern 20 is formed in the periphery of the noise blocking layer 18 in a stuttering or printing manner. The metal ring pattern 20 may be formed of a metal such as molybdenum (Mo), copper (Cu), silver (Ag), chromium (Cr), aluminum (Al), aluminum neodymium (AlNd), molybdenum titanium Use a relatively small metal. The metal ring pattern 20 is formed of the same metal layer as the ground terminal 22 formed at the lower end of the noise blocking layer 18 and is electrically connected. For example, the metal ring pattern 20 is formed by forming a silver (Ag) paste in the form of a closed rectangular band at the outer portion of the noise blocking layer 18 using a printing method. The ground terminal 22 electrically connected to the metal ring pattern 20 is also formed at the lower end of the noise blocking layer 18 by a printing method using the same silver paste as the metal ring pattern 20. [

The transparent conductive layer used as the noise barrier layer 18 has a relatively high electrical resistance. 2A, when the metal ring pattern 20 is not present, the noise component is rapidly discharged in the region near the ground terminal 22 in the noise blocking layer 18, that is, at the lower end portion A, The noise blocking layer 18 is delayed in time to discharge the noise component through the ground terminal 22 due to the high electrical resistance at the upper end portion B of the touch panel 10, Can be introduced. In this case, the touch panel 10 may malfunction as in the case where the noise component is recognized as a normal sensing signal in a part of the area of the touch panel 10, that is, the upper end part B, or the touch can not be detected due to the noise component .

However, when the metal ring pattern 20 having a lower electrical resistance than the transparent conductive layer is additionally formed in the peripheral portion of the noise blocking layer 18 as shown in FIG. 2B, the noise blocking layer 18, which is distant from the ground terminal 22, The noise component is quickly discharged through the metal ring pattern 20. [ In other words, the noise component is quickly discharged toward the ground terminal 22 through the metal ring pattern 20 regardless of the distance from the noise terminal 18 to the ground terminal 22. Accordingly, it is possible to effectively prevent the noise component from the display device 40 from being introduced into a part of the area of the touch panel 10 due to the discharge delay of the noise blocking layer 18. As a result, it is possible to prevent the touch panel 10 from malfunctioning due to the inflow of noise components from the display device 40. [

FIG. 3 is a plan view showing an electrode structure for a partial area of the capacitive touch sensor 14 shown in FIG. 1, FIG. 4 is a cross-sectional view of the FPC shown in FIG. 3, Fig.

The capacitive touch sensor 14 shown in FIG. 3 has a structure in which a plurality of first sensing electrodes 141 are arranged in a horizontal direction (that is, in the X-axis direction) through the first connection electrodes 143 in the touch sensing area TSA A second sensing electrode line 142 having a connected structure and a second sensing electrode 142 having a structure in which a plurality of second sensing electrodes 145 are connected in a longitudinal direction And an electrode line 146. The plurality of first sensing electrode lines 142 are arranged in the vertical direction (Y-axis direction), and the plurality of second sensing electrode lines 146 are arranged in the horizontal direction (X-axis direction). Each of the first and second sensing electrodes 141 and 145 is mainly formed in a rhombus shape, and may be formed in various other shapes. The first and second connection electrodes 143 and 147 are formed so as to cross each other with an insulating layer (not shown) therebetween. The first and second sensing electrodes 141 and 145 and the second connection electrode 147 are all formed of the same transparent conductive layer and the first connection electrode 143 is formed with the transparent conductive layer and the insulating layer interposed therebetween And the first connection electrode 143 is electrically connected to the first sensing electrode 1441 through a contact hole passing through the insulating layer. Alternatively, the first connection electrode 143 may be formed of the same transparent conductive layer together with the first and second sensing electrodes 141 and 145, and the second connection electrode 147 may be formed of a metal layer, 2 sensing electrode 145. [0033] FIG. The first and second sensing electrodes 141 and 145 form a capacitor and a conductive touch object that touches the cover substrate 12 to change a capacitance to output a sensing signal.

The capacitive touch sensor 14 includes a first sensing electrode line 142 electrically connected to the first sensing electrode line 142 of the touch sensing area TSA in an outer area OA surrounding the touch sensing area TSA, A second routing line 160 electrically connected to the second sensing electrode line 146 and a pad 160 electrically connected to the first and second routing lines 150 and 160, 170). The first routing line 150 is connected to the corresponding pad 170, which is connected to the left and right end portions of the first sensing electrode line 142 and is located in the pad region at the lower end of the outer region OA. The second routing line 160 is connected to the pad 170, which is connected to the lower end of the second sensing electrode line 146 and is located in the pad region. The first and second routing lines 150 and 160 and the pad 180 are formed of the same metal layer as any one of the first and second connection electrodes 143 and 147 of the touch sensing area TSA.

For example, on the lower substrate 16, along with the first and second routing lines 150 and 160 and the pad 180 of the outer area OA, the first and second connection electrodes < RTI ID = 0.0 > The first and second sensing electrodes 161 and 165 are formed on the insulating layer and the first and second sensing electrodes 161 and 165 are formed on the insulating layer. A transparent conductive pattern including the remaining one of the two connection electrodes 143 and 147 is formed.

A plurality of pads 174 formed in the pad region are electrically connected to the FPC 180 and are electrically connected to a touch controller (not shown) mounted on the FPC. The touch controller not only drives the first and second sensing electrode lines 142 and 146 of the touch sensor 14 but also inputs sensing signals from the first and second sensing electrode lines 142 and 146, And senses the touch position from the X-axis and Y-axis positions of the first and second sensing electrode lines 142 and 146 that output sensing signals.

The extension 180A extending from one end of the FPC 180 is electrically connected to the ground terminal 22 formed on the back surface of the touch panel 10 as shown in FIG. In other words, the extended portion 180A of the FPC 180 is bent along the side surface of the lower substrate 16 of the touch panel 10 as shown in Fig. 4, and is grounded on the back surface of the lower substrate 16, And is electrically connected to the terminal 22. The extended portion 180A of the FPC 180 has a narrow portion bent along the side surface of the lower substrate 16 and a wide portion connected to the ground terminal 22 on the back surface of the lower substrate 16 . The FPC 180 discharges noise components discharged from the noise blocking layer 18 through the metal ring pattern 20 and the ground terminal 22 to the ground power supply side to remove the noise components.

As described above, in the display device having the touch panel according to the first embodiment of the present invention, the noise blocking layer 18 made of a transparent conductive layer is formed on the back surface of the touch panel 10 attached to the display device 40 And the metal ring pattern 20 is formed on the outer peripheral portion of the noise blocking layer 18 so that the noise component flowing from the display device 40 regardless of the distance between the noise blocking layer 18 and the ground terminal 22 Can be effectively shielded. This minimizes noise components flowing into the touch panel 10 from the display device 40, thereby preventing malfunction of the touch panel 10 due to noise components, The input noise components are also minimized, and the sensing range of the sensing signal is expanded, so that the sensing power of the touch controller can be improved.

Second Example

2B, when the metal ring pattern 20 having a lower electrical resistance than the transparent conductive layer is further formed on the periphery of the noise blocking layer 18, It is possible to obtain a relatively higher resistance value than the portion where the metal ring pattern 20 is formed.

In order to solve the problem that the central portion of the noise barrier layer 18 has a relatively high resistance value, a metal line can not be formed at the center of the noise barrier layer 18. This is because when the metal line is formed at the center of the noise blocking layer 18, the metal line blocks the screen displayed on the display device.

The liquid crystal display device of the display device comprises a thin film transistor array substrate, a color filter array substrate, and a liquid crystal layer filled between the two substrates.

Wherein the thin film transistor array substrate is provided with a plurality of gate lines and a plurality of data lines arranged in a direction perpendicular to each other to define pixel regions and a plurality of thin films formed in the pixel region at the intersection of the gate lines and the data lines A transistor, and a plurality of pixel electrodes formed in the pixel regions. The thin film transistor is turned on / off according to a scan signal of the gate line to supply a data signal of the data line to each pixel electrode.

In addition, a black matrix layer is formed on the color filter array substrate to prevent a light-induced phenomenon at a portion corresponding to a plurality of gate lines, a data line, and a plurality of thin film transistors formed in the thin film transistor array substrate, And a color filter layer is formed to realize a color at a corresponding portion.

Therefore, in order to solve the problem that the central portion of the noise blocking layer 18 has a relatively high resistance value, the noise blocking layer 18 may be arranged in alignment with the black matrix layer in addition to the first embodiment of the present invention. A metal line can be formed at the central portion of the substrate.

A display device having a touch panel according to a second embodiment of the present invention, in which a metal line is further formed on the metal ring pattern 20 at the center of the noise blocking layer 18 as described above, will be described.

5 is a rear view of a touch panel showing a metal ring pattern and a metal line formed in the noise blocking layer according to the second embodiment of the present invention.

The display device having the touch panel according to the second embodiment of the present invention is the same as the basic configuration of the first embodiment of the present invention described with reference to FIGS. 1 to 4, except that the noise blocking layer 18 formed on the back surface of the touch panel, The present invention is characterized in that not only the metal ring pattern 20 but also at least one metal line 21 is added to solve the problem that the central portion of the noise blocking layer 18 has a relatively high resistance value.

Therefore, the same components are denoted by the same reference numerals, and the description of the remaining components is omitted.

When the display device is a liquid crystal display device, the at least one metal line 21 is formed in alignment with the black matrix layer of the liquid crystal display device.

The black matrix layer (not shown in the figure) is formed to prevent a light-induced phenomenon at a portion corresponding to a plurality of gate lines, a data line, and a plurality of thin film transistors formed in the thin film transistor array substrate. The width of the black matrix layer formed along the gate line is about 7 mu m and is wider than the width of the black matrix layer formed along the data line.

Accordingly, the at least one metal line 21 is formed on the noise blocking layer 18 in the display region so as to be electrically connected to the metal ring pattern 20, and aligned on the black matrix layer in the gate line direction .

That is, since the width of the black matrix layer formed along the gate line is about 7 mu m, the designable width of the at least one metal line 21 is not limited to about 3 mu m even if the alignment process margin (error) The maximum is about 3 mu m. That is, the line width of the at least one metal line 21 is preferably 1 탆 to 3 탆.

As described above, at least one metal line 21 is further added to solve the problem that the central portion of the noise blocking layer 18 has a relatively high resistance value.

At this time, since the at least one metal line 21 is formed of the same material as the metal ring pattern 20, an additional mask process is not required.

Therefore, according to the second embodiment of the present invention, at least one metal line 21 is formed on the noise blocking layer 18 by being aligned with the black matrix layer formed in the gate line direction of the display device 40, It is possible to solve the problem that the center portion of the noise blocking layer 18 has a relatively higher resistance value than the portion where the metal ring pattern 20 is formed without affecting the screen displayed on the display device 40. [

That is, since the at least one metal line 21 is formed by being aligned with the black matrix layer formed in the gate line direction of the display device 40, the resistance of the touch panel can be reduced without adversely affecting the visibility of the display device 40 And the uniformity can be improved.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be clear to those who have knowledge of.

10: touch panel 12: cover substrate
14: touch sensor 16: lower substrate
18: Noise blocking layer 20: Metal ring pattern
21: metal line 22: ground terminal
30: adhesive layer 40: display device
141: first sensing electrode 142: first sensing electrode line
143: first connection electrode 145: second sensing electrode
146: second sensing electrode line 148: second connecting electrode
150: first routing line 160: second routing line 170: pad 180: FPC 180A: FPC extension

Claims (10)

A display device;
A touch panel attached to the display device through an adhesive layer;
A noise blocking layer formed entirely on a rear surface of the touch panel and made of a transparent conductive layer for blocking an electric noise component from entering the touch panel from the display device;
A metal ring pattern formed on the noise blocking layer so as to surround an outer region of the noise blocking layer and having a lower electrical resistance than the transparent conductive layer;
And a ground terminal electrically connected to the noise blocking layer and the metal ring pattern. The method according to claim 1,
The touch panel
A lower substrate on which the noise blocking layer, the metal ring pattern and the ground terminal are formed,
A capacitive touch sensor formed on an inner surface of the lower substrate;
And a cover substrate formed on the touch sensor. 3. The method of claim 2,
A circuit film electrically connected to the touch sensor and a touch controller for driving the touch sensor;
And a circuit film extension unit connected to the ground terminal formed on the back surface of the lower substrate, the circuit film extension unit being bent along the side surface of the lower substrate from the inner side surface of the lower substrate. The method of claim 3,
Wherein the circuit film extension portion is wider than a second portion where a width of a first portion connected to the ground terminal is bent along a side surface of the lower substrate. The method according to claim 1,
Wherein the metal ring pattern and the ground terminal are integrally formed of the same metal layer. The method according to claim 1,
Wherein the noise barrier layer is formed of a transparent conductive film. The method according to claim 1,
Further comprising at least one metal line formed on the noise blocking layer and electrically connected to the metal ring pattern. 8. The method of claim 7,
The display device includes:
A plurality of gate lines and a plurality of data lines arranged in a direction perpendicular to each other to define a pixel region and a plurality of thin film transistors formed in a pixel region at a portion where the gate lines and the data lines cross each other; A liquid crystal display device having a black matrix layer for preventing a light leakage phenomenon at a portion corresponding to a gate line, a data line and a plurality of thin film transistors,
Wherein the at least one metal line is formed in alignment with the black matrix layer. 9. The method of claim 8,
Wherein the at least one metal line is aligned on the black matrix layer along the gate line direction. 10. The method of claim 9,
Wherein the line width of the at least one metal line is 1 to 3 m.

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