KR20150037298A - Touch display device - Google Patents

Abstract

The present invention relates to a touch display device.
A touch display device according to the present invention includes a touch panel including a display panel including first and second substrates bonded to each other and a first electrode and a second electrode formed on the outer surface of the second substrate, A cover glass disposed above the touch sensor unit, and a driving printed circuit board attached to the rear edge of the cover glass and including a pattern electrode for realizing a touch key.
In this way, a home key can be implemented in a touch manner.

Description

{TOUCH DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch display device, and more particularly, to a touch display device capable of realizing a home key with a touch key.

2. Description of the Related Art [0002] As an information-oriented society develops, there have been various demands for a display device for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) A flat display device such as an organic light emitting diode (OLED) is being utilized.

Among these display devices, liquid crystal display devices are advantageous for moving picture display and have a high contrast ratio as images are realized by optical anisotropy and polarization of liquid crystal, .

Such a liquid crystal display device has a liquid crystal panel in which a liquid crystal panel is interposed between two adjacent substrates through a liquid crystal layer as an essential component and changes the alignment direction of the liquid crystal molecules in an electric field in the liquid crystal panel to realize a difference in transmittance do.

2. Description of the Related Art Recently, a touch display device using a touch screen capable of driving a surface of a display panel by touching the touch panel has been developed.

Here, the touch screen is used as an output means for displaying an image, and is used as an input means for inputting a command of a user by touching a specific portion of the displayed image. The touch screen is divided into a decompression system, Method, and an ultrasonic method.

Such a touch display device may be manufactured by attaching a separate touch panel to a display panel or by integrating a touch panel formed on a substrate of the display panel.

When the user touches the screen while viewing an image displayed on the display panel, the touch display device thus manufactured detects the position information of the touch part and compares the detected position information with the position information of the image to recognize the user's command .

Such a touch display device includes a home key for returning to a home. In general, since a home key is widely used, it is used as a mechanical key button for reducing power consumption and recognizing it more accurately than a touch key.

However, when a home key is implemented using a mechanical key button, a key button is required and a control board for controlling the key key is required, which increases the number of processes and increases the cost of parts.

In addition, since the development trend is gradually changing in a touch manner, a touch type home key is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a touch display device implementing a touch key.

It is another object of the present invention to provide a touch display device capable of minimizing the process and cost.

According to an aspect of the present invention, there is provided a touch display device including: a display panel including first and second substrates bonded together; A touch sensor unit including a first electrode and a second electrode spaced apart from each other on an outer surface of the second substrate; A cover glass disposed on an upper portion of the touch sensor unit; And a driving printed circuit board attached to a rear edge of the cover glass and including a pattern electrode for implementing a home key in a touch manner.

Here, the first electrode and the second electrode are formed in the same one layer.

Alternatively, the first electrode and the second electrode may be formed on different layers.

A first FPCB connecting the touch sensor unit to the driving printed circuit board, and a second FPCB connecting the display panel and the driving printed circuit board.

In particular, the driving printed circuit board includes a bottom layer including a wiring pattern for driving the touch sensor unit, a top layer including a controller IC for a touch panel, a first pattern electrode for driving the hometry key, and a second pattern electrode, And an intermediate layer between the uppermost layer and the lowermost layer, the intermediate layer including wiring and a pattern for driving the display panel.

In this case, the first pattern electrode and the second pattern electrode are connected to the controller IC for the touch panel.

According to the touch display apparatus according to the present invention, a home key can be implemented in a touch manner, so that the touch screen can quickly respond to a changing market structure.

In addition, by forming the touch sensor portion on the outer surface of the second substrate, it is possible to manufacture a lightweight and thin touch display device.

In particular, by forming an electrode pattern for a groove key on the lowermost layer of a drive printed circuit board, a printed circuit board and an FPC for a hind key implementation are not required, and the cost of parts and the whole process can be simplified.

In addition, by attaching the driving printed circuit board directly to the back surface of the cover glass, the inner space of the display device can be efficiently used and slimness can be achieved.

1 is a sectional view showing a touch display device according to a first embodiment of the present invention;
2 is a plan view showing the touch panel unit of FIG. 1;
3 is a cross-sectional view showing a touch display device according to a second embodiment of the present invention.
4A is a plan view showing a front surface of the drive printed circuit board of FIG. 3;
Fig. 4B is a plan view showing the back side of the driving printed circuit board of Fig. 3; Fig.
5 is a plan view of a touch display device according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Here, the present invention relates to a touch display device in which a touch screen is integrated, and a liquid crystal display device will be described as an example of a display device. However, the present invention is not limited to this, and it is obvious that the present invention can be applied to various display devices such as a field emission display, a plasma display, an electroluminescence display, an electrophoretic display, and an organic light emitting diode display.

FIG. 1 is a cross-sectional view showing a touch display device according to a first embodiment of the present invention, and FIG. 2 is a plan view showing the touch panel of FIG.

1, the touch display apparatus 100 includes a display panel 110 for displaying an image, a backlight unit 130 (see FIG. 1) disposed on the back surface of the display panel 110 and supplying light to the display panel 110, A touch panel 150 positioned above the display panel 110 and a cover glass 190 disposed at an upper portion of the touch panel 150 and protecting the display screen ).

At this time, the display panel 110 and the touch panel unit 150 are attached by the first adhesive unit 162, and the touch panel unit 150 and the cover glass 190 are attached by the second adhesive unit 164 do.

The display panel 110 includes a first substrate 112 as an array substrate and a second substrate 114 as a color filter substrate which are spaced apart from each other and facing each other between the first and second substrates 112 and 114 A liquid crystal layer is interposed.

In this case, a gate wiring (not shown) formed along the first direction on the inner surface of the first substrate 112 and transmitting a scanning signal from the driving circuit, and a gate wiring (not shown) formed along the second direction crossing the first direction, (Not shown), a thin film transistor (TFT) formed at an intersection thereof, and a pixel electrode connected to a drain electrode of the thin film transistor. The thin film transistor includes a gate electrode, a gate insulating film formed on the gate electrode, a semiconductor layer over the gate insulating film, and source and drain electrodes formed on the semiconductor layer.

On the inner surface of the second substrate 114, a color filter of red (R), green (G), and blue (B) colors corresponding to each pixel, A data line, and a black matrix covering a non-display element such as a thin film transistor.

Meanwhile, the common electrode may be a display panel of an IPS mode operated by a horizontal electric field by being alternately formed on the same layer or different layers as the pixel electrodes formed on the first substrate 112. An ECB mode, or a VA mode in which a common electrode is formed on the second substrate 114 to operate by a vertical electric field.

The backlight unit 130 includes a direct light source or a light source that is disposed at a lower portion of the display panel 110 to provide direct light and is disposed on at least one side of the light guide plate to provide indirect light using refraction and reflection in the light guide plate. Lt; / RTI >

At this time, the side-type backlight unit is easier to manufacture than the direct-type backlight unit, and has the advantage of being thin, light in weight, and low in power consumption.

The backlight unit includes a light guide plate, a light source arranged along at least one side of the light guide plate, and a light source disposed under the light guide plate and reflecting light passing through the back surface of the light guide plate in a direction toward the display panel. A reflective plate, and a plurality of optical sheets interposed between the upper surfaces of the light guide plate and diffusing or condensing light converted into the surface light source by the light guide plate to provide the light to the display panel. In this case, a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) may be used as a light source, but a fluorescent lamp having advantages in power consumption, weight, It is preferable to apply a light emitting diode (LED).

The touch panel unit 150 includes a touch sensor film 151 including a layer of indium-tin oxide (ITO), which is a metal conductive material, a first electrode formed on both surfaces of the touch sensor film 151, 152, and 154, respectively.

Referring to FIG. 2, a plurality of first electrodes 152 are formed along the length direction of the touch sensor film 151, and a plurality of second electrodes 154 Thereby forming the touch panel unit 150.

Here, a plurality of first electrodes 152 and a plurality of second electrodes 154 function as a driving electrode to which a voltage is applied and the other to a sensing electrode for detecting a voltage signal .

The touch panel unit 150 sequentially applies a voltage signal to the driving electrode and detects a voltage value on the sensing electrode side. When a predetermined inputting means such as a finger or a pen touches the touch panel unit 150, the capacitance formed between the first and second electrodes And the touch position and the touch position can be detected.

At this time, the touch sensor film 151 includes an extension film 151a protruding from a part of one edge thereof.

A first pattern electrode 182 for a dummy key is formed under the extension film 151a and a second pattern electrode 184 is formed on the extension film 151a. Respectively.

In this way, by providing the extension film 151a for the home key on the touch sensor film 151, the home key can be implemented in a touch manner.

The driving printed circuit board 180 for driving the display panel 110 and the touch panel unit 150 is connected to the display panel 110 through a flexible printed circuit board (FPCB) So that it can be closely disposed on the back surface of the backlight unit 120.

The driving printed circuit board 180 is for driving the display panel 110 and the touch panel unit 150 to be associated with each other and is connected to the touch panel unit 150 through the first and second FPCBs 172 and 174, And is connected to the display panel 110 through the third FPCB 176. At this time, although not shown in the figure, the third FPCB 176 may be divided into at least two. A gate circuit board (not shown) is connected to the first substrate 112 of the display panel 110 via one FPCB along one edge of the first substrate 112, and another FPCB is formed along the other edge A data circuit board (not shown) may be connected thereto.

Various wiring lines for driving the display panel 110 and the touch panel unit 150 in association with each other are formed on the driving printed circuit board 180 and a controller IC for the touch panel unit 150 for driving the touch panel unit 150 is incorporated Can be.

The touch display device 100 according to the first embodiment of the present invention having the above-described structure is advantageous in that the touch panel unit 150 is attached to a display panel to integrate the touch panel unit 150, An extension film 151a formed by extending a part of the touch sensor film 151 is required, which causes a problem of increasing space and cost.

Hereinafter, a touch display device according to a second embodiment of the present invention, which simplifies a manufacturing process and reduces manufacturing costs, will be described.

FIG. 3 is a cross-sectional view showing a touch display device according to a second embodiment of the present invention, FIG. 4A is a plan view showing a front surface of the driving printed circuit board of FIG. 3, FIG. 5 is a plan view of a touch display device according to a second embodiment of the present invention, and FIG. 5 is a plan view of a touch display device according to a second embodiment of the present invention. Here, the structure except for the touch sensor part and the driving printed circuit board is the same as that shown in Fig. 1, and thus a detailed description of the same structure will be omitted.

3, the touch display device 200 according to the second embodiment of the present invention includes a display panel 210 for displaying an image, a display panel 210 disposed on the back surface of the display panel 210, A backlight unit 230 for supplying light to the display panel 210, a touch sensor unit 254 outside the display panel 210, a driving printed circuit board (not shown) for driving the display panel 210 and the touch sensor unit 254 280) and a cover glass (290) positioned above the touch sensor unit (254).

The display panel 210 includes a first substrate 212 as an array substrate and a second substrate 214 as a color filter substrate facing each other with a space therebetween and the first substrate 212 and the second substrate 214 A liquid crystal layer is interposed.

A touch sensor unit 254 is formed on the outer surface (outer surface) of the second substrate.

The touch sensor unit 254 includes a first electrode and a second electrode formed on the same one layer and spaced apart from each other.

Or the touch sensor unit 254 may include a first electrode and a second electrode formed on the lower and upper portions of the insulating layer with an insulating layer therebetween.

Here, one of the first electrode and the second electrode functions as a driving electrode to which a voltage is applied, and the other serves as a sensing electrode for detecting a voltage signal.

At this time, the touch sensor unit 254 may further include a planarizing layer for planarizing the first and second electrodes.

The touch sensor unit 254 sequentially applies a voltage signal to the driving electrode and detects a voltage value on the sensing electrode side. When a predetermined input means such as a finger or a pen touches the touch electrode, And the touch position and the touch position can be detected.

The driving printed circuit board 280 is connected to the touch sensor unit 254 through the first FPCB 272 and is connected to the display panel 210 through the second FPCB 274.

4A and 4B, the second FPCB 274 may be divided into at least two FPCBs 274a and 274b. A gate circuit board (not shown) is connected to the first substrate 212 of the display panel 210 via a FPCB 274a along one edge of the first substrate 212 and an FPCB 274b A data circuit board (not shown) may be connected to the data circuit board.

The drive printed circuit board 280 includes various wires for associatively driving the display panel 210 and the touch sensor unit 254 and a touch panel controller 254 connected to the touch sensor unit 254 via the first FPCB 272. [ An IC 320 is incorporated.

At this time, the driving printed circuit board 280 includes a layer including various wirings for driving the display panel 210, various wirings for driving the touch sensor unit 254, and a controller IC 320 for a touch panel Layer 280a. ≪ / RTI >

For example, the driving printed circuit board 280 according to the second embodiment of the present invention includes a plurality of wires and patterns for driving the touch sensor unit 254, A second layer and a third layer including various wirings and patterns for driving the display panel 210 and first and second pattern electrodes 282 for driving a home key, , And a fourth lower layer 280b including the second layer 284.

It is a feature of the present invention that the first and second pattern electrodes 282 and 284 are formed in the fourth layer 280b of the drive printed circuit board 280. [

As described above, the first and second pattern electrodes 282 and 284 for driving the home key are formed on the lowermost fourth layer 280b of the drive printed circuit board 280, and the drive printed circuit board 280 is mounted on the cover It is possible to avoid using a separate printed circuit board or FPCB to implement a home key by directly attaching to the back surface of the glass 290.

At this time, the first and second pattern electrodes 282 and 284 are preferably internally connected to the controller IC for the touch panel provided on the uppermost first layer 280a.

The touch display device 200 according to the second embodiment of the present invention having the above-described structure is different from the touch panel unit 150 of FIG. 1 in that the touch sensor unit 200 is directly provided on the back surface of the second substrate 214, (151 in Fig. 1) can be omitted, and the number of FPCBs can be reduced. This reduces the number of processes, reduces component costs and manufacturing costs, while at the same time realizing lightweight and thin touch displays.

Further, by attaching the drive printed circuit board 280 directly to the back surface of the cover glass 290, the length of the FPCB is shortened, and the cost of parts can be reduced.

5, the cover glass 290 positioned at the uppermost position of the touch display device 200 includes a transmissive portion 201a for displaying an image by the display panel 210, And a light-shielding portion 201b formed along the edge and covering the non-display region.

Accordingly, the touch display device 200 according to the embodiment of the present invention includes a touch key driven in the light shielding portion 201b of the cover glass 290.

Meanwhile, although not shown, a second polarizer may be positioned above the touch sensor unit 254. More specifically, a first polarizing plate is positioned between the backlight unit 230 and the first substrate 212, that is, the outer surface of the first substrate 212, and the touch sensor unit 254 and the bonding unit 260 The second polarizing plate can be positioned.

Although the touch sensor unit 254 is formed on the second substrate 214 in the embodiment of the present invention, the touch sensor unit 254 may be formed on the first substrate 212 .

The pixel electrode or the common electrode formed on the first substrate may also serve as a driving electrode, and the detecting electrode may be further formed on the second substrate.

In addition, in the FFS mode liquid crystal display device in which the pixel electrode and the common electrode are formed in different layers to realize a fringe field, an electrode formed at a certain distance from the common electrode or the pixel electrode is formed as a function of the driving electrode and the detecting electrode . ≪ / RTI >

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

100, 200: touch display device 110, 210: display panel
130, 230: backlight unit 254: touch sensor unit
190, 290: cover glass 180, 280: driving printed circuit board

Claims (6)

A display panel comprising first and second substrates bonded together facing each other;
A touch sensor unit including a first electrode and a second electrode spaced apart from each other on an outer surface of the second substrate;
A cover glass disposed on an upper portion of the touch sensor unit; And
A driving printed circuit board (PCB) including a pattern electrode for attaching to a rear edge of the cover glass and realizing a home key in a touch manner,
And a touch panel.
The method according to claim 1,
The first and second electrodes
And the second electrode is formed on the same one layer.
The method according to claim 1,
The first and second electrodes
And the second electrode is formed on different layers.
The method according to claim 1,
A first FPCB connecting the touch sensor unit and the driving printed circuit board, and a second FPCB connecting the display panel and the driving printed circuit board.
The method according to claim 1,
Wherein the driving printed circuit board includes a bottom layer including a wiring pattern for driving the touch sensor unit, a top layer including a controller IC for a touch panel, a first pattern electrode for driving the top key, and a second pattern electrode, And an intermediate layer between the uppermost layer and the lowest layer, the intermediate layer including a wiring and a pattern for driving the display panel.
6. The method of claim 5,
The first pattern electrode and the second pattern electrode
And the touch panel controller IC is connected to the touch panel controller IC.

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