TW201627846A - Touch display apparatus - Google Patents

Abstract

Disclosed is a touch display apparatus which decreases a load of each of a plurality of touch electrodes and reduces a load deviation between the plurality of touch electrodes, thereby enhancing image quality. The touch display apparatus includes a touch display panel where a plurality of touch electrodes are disposed, a touch driver configured to supply a touch driving signal to the plurality of touch electrodes and sense an amount of electric charge of each of the plurality of touch electrodes during a touch period, and a plurality of touch signal lines configured to respectively connect the plurality of touch electrodes to a plurality of channels included in the touch driver. Here, each of the plurality of touch electrodes may include a plurality of slits and may be disposed in a mesh form.

Description

Touch display device

The present invention relates to a touch display device that reduces the load of each of a plurality of touch electrodes and reduces load deviation between the touch electrodes, thereby improving image quality.

Input devices such as a mouse and a keyboard are conventionally applied as an input device of a liquid crystal display device or a flat display device, and an alternative touch panel is applied to the liquid crystal display device, so that the user can directly input information using a finger or a pen. Since all users can easily manipulate the touch screen, the application of the touch panel is expanded.

According to the touch sensing method, the touch panel is classified into a resistive type, a capacitive type, an infrared type, and the like. In recent years, capacitive type has attracted a lot of attention because the capacitive type provides convenience in the manufacturing process and the touch sensitivity is good. Capacitive touch panels are classified as mutual capacitance and self capacitance.

Recently, in the built-in touch type, a capacitive touch sensor is built in the liquid crystal panel, and the industry has developed an in-cell touch type to thin the liquid crystal display device to which the touch screen is applied. The in-cell touch display device uses a common electrode as a touch sensor, and the common electrode is placed on the thin film transistor array substrate. In the following description, the touch display panel indicates that the touch sensor is built into the liquid crystal panel with an in-line touch. In addition, the sensing of the touch electrodes is completed by self-capacitance.

FIG. 1 is a schematic diagram of a built-in touch-sensitive touch display device of the prior art, and FIG. 2 is a schematic diagram of a connection structure between a self-capacitance touch electrode and a touch signal line.

Referring to FIG. 1 and FIG. 2 , the embedded touch display device of the prior art includes a touch display panel, a touch driver 30 , a display driver (not shown), and a backlight unit (not shown) ).

The touch display panel includes a thin film transistor array substrate and a color filter array substrate bonded to each other with a liquid crystal layer interposed therebetween. The common electrode placed on the thin film transistor array substrate is patterned into a plurality of blocks, thus providing a plurality of touch electrodes 10. In the example shown in FIG. 1 , in the touch display panel, twenty touch electrodes 10 are placed in the horizontal direction, and thirty touch electrodes 10 are placed in the vertical direction, that is, a total of 600 is placed in the touch display panel. Touch electrodes 10.

The embedded touch display device of the prior art divides a frame period into a display period and a touch period, and completes the display driving and the touch driving in a time sharing manner.

During the display period, the embedded touch display device of the prior art supplies a data voltage to the pixel electrode and supplies a common voltage (Vcom) to the plurality of touch electrodes 10 to display an image. During the touch cycle, the in-cell touch display device of the prior art supplies the touch drive signal to each of the plurality of touch electrodes 10, and then senses the capacitance of each of the plurality of touch electrodes 10, Thereby determining whether there is a touch and detecting the touch position.

The touch driver 30 includes a touch signal generator, a sensing unit, and a plurality of multiplexers 32.

A plurality of multiplexers 32 are used to reduce the number of channels of the touch driver 30, and the plurality of multiplexers 32 placed have an input to output ratio of N:1. Each of the plurality of touch electrodes 10 is connected to a touch signal line 20, and the touch signal line 20 is connected to a channel of the corresponding multiplexer 32.

As shown in FIG. 2, the first touch electrode 12a is connected to the first touch signal line 22a through a plurality of contacts CNT. In addition, the second touch electrode 12b is connected to the second touch signal line 22b through a plurality of contacts CNT. As described above, each of the plurality of touch electrodes is connected to the corresponding touch signal line through the plurality of contacts CNT.

The touch driving signal output by the touch signal generator is supplied to each of the plurality of touch electrodes 10 by the corresponding multiplexer 32. In addition, the sensing unit senses the amount of charge charged in each touch electrode 10 to determine whether there is a touch and detect a touch position.

Fig. 3 is a schematic view showing the problem of deterioration of image quality due to load deviation of the touch electrodes.

Referring to FIG. 3, the touch driving signal is applied to the touch electrode 12a through the touch signal line 22a, but a load deviation occurs in one touch electrode. In addition, a load deviation occurs between the plurality of touch electrodes. For this reason, image quality is degraded.

For example, when twenty touch electrodes are arranged in the vertical direction, a load deviation occurs between the first touch electrodes 12a, the tenth touch electrodes 12b, and the twentieth touch electrodes 12c. That is to say, when the touch electrode is close to the contact CNT connecting the touch electrode and the corresponding touch signal line, the load of the touch electrode is small, but as the touch electrode becomes far away, the touch electrode and the corresponding touch are The contact CNT connected to the control signal line increases the load of the touch electrode.

When a load deviation occurs between a touch electrode and a plurality of touch electrodes, a difference occurs in time until the common voltage (Vcom) fluctuates and then returns to the initial voltage value, and due to the time difference, an inter-region occurs in the entire screen. The difference in the root mean square of the voltage. For this reason, mura is present and image quality is deteriorated.

Accordingly, the present invention is directed to a touch display device that substantially obviates one or more of the problems caused by the limitations and disadvantages of the prior art.

An aspect of the present invention provides a touch display device that reduces the load of a touch electrode and thereby improves image quality.

Another aspect of the present invention is to provide a touch display device that reduces load deviation of a touch electrode and thereby improves image quality.

Other advantages and features of the present invention will be apparent from the following description of the invention.

The other advantages, objects, and features of the invention will be set forth in part in the description in the description which claims It is understood or can be derived from the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the <RTIgt;

The present invention provides a touch display device including a touch display panel in which a plurality of touch electrodes are placed, and a touch driver, which is used for the purpose of obtaining the present invention and other features. The number of charges for supplying the touch driving signals to the touch electrodes and sensing each of the touch electrodes during the touch period, and the plurality of touch signal lines for respectively connecting the touch electrodes to the touch driver Multiple channels included in the channel. Herein, each of these touch electrodes includes a plurality of slits and is placed in a mesh form.

In the touch display device of the embodiment of the invention, a touch signal line is placed to overlap the slits.

In the touch display device of the embodiment of the invention, the slits are placed in the non-display area.

Another aspect of the present invention provides a touch display device, including a touch display panel with a plurality of touch electrodes, and a touch driver for supplying touch driving signals to the touch electrodes and sensing during a touch period. The amount of charge of each of the touch electrodes and the plurality of touch signal lines are respectively connected to the touch electrodes to a plurality of channels included in the touch driver, and a plurality of contact lines respectively connected to the touch electrodes .

In the touch display device of the present invention, one touch signal line is connected to the corresponding touch electrodes through a plurality of first contacts, and one touch electrode is connected to the at least two contact lines through the plurality of second contacts.

In the touch display device of the embodiment of the invention, the contact lines are placed near the touch signal lines.

In the touch display device of the embodiment of the invention, the plurality of first contact lines of the contact lines are placed to overlap with the first touch electrodes, and the plurality of second contact lines of the contact lines are placed in the second The touch electrodes overlap, and the first contact lines are spaced apart from the second contact lines.

It is to be understood that the foregoing general description of the invention and the claims

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numbers are used in the drawings to represent the same or like parts.

In the description, it should be noted that like reference numerals have been used in the drawings in the drawings and In the following description, when functions and functions known to those skilled in the art are not related to the basic configuration of the present invention, detailed description thereof will be omitted. The terms described in the specification should be understood as follows.

Advantages and features of the present invention and methods of its implementation will be clarified by the embodiments described below in conjunction with the accompanying drawings. However, the invention may be embodied in various forms and should not be limited to the embodiments described herein. These embodiments are provided so that this disclosure will be complete and complete, and will fully cover the scope of the invention. In addition, only the scope of the patent application scope defines the invention.

In the specification, in the additional reference numerals of the elements in the drawings, it should be noted that the same reference numerals have been used for the elements in the other drawings.

The shapes, dimensions, ratios, angles, and numbers disclosed in the drawings for describing the embodiments of the present invention are merely examples, and thus the present invention is not limited to the details shown. Like reference numerals refer to like elements throughout. In the following description, a detailed description of related known functions or configurations will be omitted when it is determined that it is not necessary to obscure the focus of the present invention. In the case of "including", "having" and "including" in this specification, other parts may be added unless "only ~" is used. The singular terms include the plural unless the singular forms are used.

When translating a component, this component is interpreted as containing a range of errors, although not explicitly described.

When describing the positional relationship, for example, when the positional relationship between the two components is described as "~above", "~above", "down", and "~near", unless "just" or "Direct", one or more other components can be placed between two components.

When describing the time relationship, for example, when the time sequence is described as "after", "~ next", "~ then", and "~ before", unless "just" or "direct" is used, Contains discontinuities.

The term "at least one of" should be understood to include any and all combinations of one or more related list items. For example, the meaning of "at least one of the first item, the second item, and the third item" means a combination of two items of the first item, the second item, and the third item, and the first item, the first item Two or three.

It will be understood that although the terms "first", "second", and the like are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly a second element could be termed a first element, without departing from the scope of the invention.

Those skilled in the art will fully appreciate that features of various embodiments of the present invention may be coupled or combined in part or in whole, and may be technically interoperable and driven with each other. The embodiments of the present invention may be performed separately from each other or may be performed in accordance with mutually dependent relationships.

According to the adjustment method of the alignment of the liquid crystal, the liquid crystal display device has been developed into a nematic twist (TN) mode, a vertical alignment (VA) mode, a horizontal electric field switching (IPS) mode, and a fringe field switching (FFS) mode.

In these modes, in the nematic twist mode and the vertical alignment mode, the pixel electrodes are placed on the lower substrate, and the common electrode is placed on the upper substrate (color filter array substrate), thereby adjusting the alignment of the liquid crystal by the vertical electric field. .

In the horizontal electric field switching mode and the fringe electric field switching mode, the pixel electrode and the common electrode are placed on the lower substrate, and the alignment of the liquid crystal is adjusted by the electric field between the pixel electrode and the common electrode.

In the horizontal electric field switching mode, a plurality of pixel electrodes and a plurality of common electrodes are alternately arranged in parallel, so that a transverse electric field is generated between the pixel electrodes adjacent to each other and the common electrode, thereby adjusting the alignment of the liquid crystal.

In the fringe field switching mode, the pixel electrode and the common electrode are provided in plural to be spaced apart from each other with an insulating layer therebetween. In this case, one electrode and the common electrode of the pixel electrode are formed in a plate shape or a pattern, and the other electrodes are formed in a finger shape. The fringe field switching mode is a mode in which the alignment of the liquid crystal is adjusted by the fringe field generated between the pixel electrode and the common electrode.

The mode of the touch panel of the embodiment of the present invention is not limited, and the vertical alignment mode (neighbor twist mode and vertical alignment mode) and the horizontal electric field switching mode (horizontal electric field switching mode and fringe field switching mode) are applied to the embodiment of the present invention. Touch panel. In the following disclosure, the horizontal electric field switching mode or the fringe field switching mode is applied to the touch panel of the embodiment of the present invention as an example.

Hereinafter, a touch display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a schematic diagram of a touch display device according to an embodiment of the present invention.

Referring to FIG. 4 , the touch display device of the embodiment of the present invention includes a touch display panel 100 , a touch driver 200 , a display driver 300 , and a backlight unit. In Fig. 4, the backlight unit is not shown.

The touch display panel 100 includes a thin film transistor array substrate, a color filter array substrate, and a liquid crystal layer disposed therebetween.

A plurality of pixels (not shown) are arranged on the thin film transistor array substrate in a matrix form. In addition, a plurality of red, green and blue color filters are placed on the color filter array substrate to respectively correspond to a plurality of pixels, and a plurality of black matrices are placed on the color filter array substrate to define a plurality of pixels. The respective open areas and avoid mixing of colors with each other.

A plurality of pixels intersecting each other and a plurality of gate lines define a plurality of pixels. A thin film transistor, a pixel electrode, and a storage capacitor (Cst) are placed in each of a plurality of regions defined by the intersection of the data line and the gate line. In addition, a plurality of touch electrodes 110 are also placed. The pixel electrode and the common electrode are each formed of a transparent conductive material such as indium tin oxide (ITO) and/or the like.

In this embodiment, a common electrode is used as the touch electrode 110 in addition to the electrodes for displaying images. To this end, a plurality of touch electrodes 110 are provided by patterning the common electrodes in the pixel units.

For example, in the touch display panel 100, twenty touch electrodes 110 are placed in the horizontal direction, and thirty-two touch electrodes 110 are placed in the vertical direction, that is, a total of 640 touches are placed in the touch display panel 100. Control electrode 110. However, the embodiment is not limited thereto. In other embodiments, the number of touch electrodes 110 placed in the touch display panel 100 is changed according to the screen size and the touch sensitivity setting. Each of the touch electrodes 110 is connected to a corresponding channel of the touch driver 200 through a corresponding touch signal line 120 of the plurality of touch signal lines 120 formed of a conductive material.

The touch display device of the embodiment of the invention separately performs the display period and the touch period to complete the job of displaying the image and sensing the touch. For example, the touch display device divides a frame period into a display period and a touch period, and completes the display driving and the touch driving according to the time sharing method.

During the display period, the touch display device supplies the data voltage to the pixel electrode and supplies the common voltage (Vcom) to the plurality of touch electrodes 110 to display the image. During the touch period, the touch display device supplies the touch driving signal to each of the plurality of touch electrodes 110, and then senses the capacitance charged in each of the plurality of touch electrodes 110 to determine whether there is a touch. Touch and detect the touch position.

The display driver 300 includes a gate driver, a data driver, and a timing controller. All or part of the gate driver, data driver and timing controller are placed on a touch panel of a chip-on glass (COG) or a film-on-film (COF, flexible printed circuit flip chip) 100.

When the touch display panel 100 is manufactured to be small in size and applied to a mobile device, the gate driver, the data driver, and the timing controller are implemented as one wafer.

The gate driver is integrated on the substrate of the touch display panel 100 in an amorphous silicon gate (ASG) type or a gate-in panel (GIP) type.

The timing controller converts the input red, green and blue image signals into frame unit digital red, green and blue image data, and supplies red, green and blue image data to the data driver according to the timing signal (TS). In this case, the timing signal (TS) includes a vertical sync signal (V-sync), a horizontal sync signal (H-sync), a clock signal (CLK), and the like.

In addition, by using a timing signal (TS), the timing controller generates a gate control signal (GCS) for controlling the gate driver to supply the gate control signal to the gate driver. The gate control signal (GCS) includes a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable signal (GOE).

In addition, the timing controller generates a data control signal (DCS) for controlling the data driver by using a timing signal (TS), and supplies the data control signal to the data driver. In this paper, the data control signal (DCS) includes a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE). Polarity control signal (POL), etc.

In addition, the timing controller supplies a synchronization signal of each of the display period and the touch period to the touch driver 200 to drive the touch driver 200 during the touch period.

According to the gate control signal (GCS) from the timing controller, the gate driver generates a gate driving signal for driving the thin film transistor included in each of the plurality of pixels. The gate driver is implemented as a separate wafer or built into the thin film transistor array substrate of the touch display panel 100 in the form of a gate in the panel.

During a display period of a frame period, the gate driver sequentially supplies the gate drive signal to a plurality of gate lines included in the liquid crystal panel. The thin film transistor included in each of the plurality of pixels is turned on according to the gate driving signal.

The data driver converts the digital red, green and blue image data supplied from the timing controller into an analog image signal, that is, a red, green and blue data voltage. In addition, according to the data control signal (DCS) from the timing controller, each time the thin film transistor of each pixel is turned on according to the gate driving signal, the data driver supplies the data voltage to the plurality of data lines respectively.

The data voltages are respectively supplied to a plurality of pixels, and the plurality of pixels are connected to each of the plurality of gate lines placed in the touch display panel 100. That is, when the first gate driving signal is supplied to the first gate line, the material voltages respectively supplied to the plurality of pixels connected to the first gate line are supplied to the plurality of data lines. Similarly, when the second gate driving signal is supplied to the second gate line, the data voltages supplied to the plurality of pixels respectively connected to the second gate line are supplied to the plurality of data lines.

The data voltages are supplied to a plurality of pixels, respectively, and a common voltage (Vcom) is supplied to the plurality of touch electrodes 110 to display an image. The data driver generates a common voltage (Vcom) to supply a common voltage (Vcom) to the plurality of touch electrodes 110. As another example, the touch driver 200 generates a common voltage (Vcom) to supply a common voltage (Vcom) to a plurality of touch electrodes 110.

The touch driver 200 includes a signal generator and a sensing unit. The signal generator generates a touch drive signal that is supplied to the plurality of touch electrodes 110. The sensing unit performs a touch algorithm according to the touch signals received from each of the plurality of touch electrodes 110.

In addition, the touch driver 200 includes a plurality of multiplexers 210 having an input/output ratio of N:1 for reducing the number of channels of the touch driver 200. A plurality of multiplexers 210 are placed between the input/output terminals of the touch driver 200 and the plurality of touch sensing lines 120, thereby reducing the total number of channels of the touch driver 200 to 1/N.

During the touch period, the touch driver 200 supplies the touch driving signal to the plurality of touch electrodes 110 according to the synchronization signal supplied by the timing controller. In this case, the touch driving signals applied to the touch electrodes 110 are generated in various forms such as square wave pulses, sine waves, triangular waves, and the like. Next, the touch driver 200 senses a charging capacitance in each of the plurality of touch electrodes 110. According to the charging capacitance in each of the plurality of touch electrodes 110, the touch driver 200 determines whether there is a touch and detects a touch position.

In the above, the touch driver 200 and the display driver 300 have been described as being implemented separately, but are not limited thereto. In other embodiments, touch driver 200 is integrated with display driver 300 and implemented as a body.

FIG. 5 is a schematic diagram showing the arrangement of the touch display device and the touch signal line according to the touch display device of the first embodiment of the present invention.

Referring to FIG. 5, the first to third touch electrodes 112a to 112c of all of the plurality of touch electrodes 110 are shown. In addition, the first to fourth touch signal lines 122a to 122d of all the touch signal lines 120 are shown.

In the touch display device of the first embodiment of the present invention, each of the plurality of touch electrodes 110 is provided in a mesh form, thereby reducing the internal load deviation of each of the plurality of touch electrodes 110 and reducing the plurality of touches. Load deviation between electrodes.

A detailed description will be provided, each of the first to third touch electrodes 112a to 112c including a plurality of slits 114. The plurality of slits 114 are provided by patterning the plate-shaped first to third touch electrodes 112a to 112c, and the first to third touch electrodes 112a to 112c have a mesh form due to the plurality of slits 114. In this case, the plurality of slits 114 are placed in the non-display area, so that the operation of generating an electric field by the pixel electrodes is not affected when the display is driven.

In addition, each of the touch signal lines 120 is placed to overlap the plurality of slits 114. As described above, since each of the touch signal lines 120 is placed to overlap the plurality of slits 114, the load of each touch electrode is reduced, and the overlap between the touch signal lines and the touch electrodes is reduced. capacitance. Therefore, the degree of deterioration of image quality due to overlapping capacitance is reduced.

The plurality of touch electrodes 110 and the plurality of touch signal lines 120 are placed to overlap each other with an insulating layer therebetween. Each of the plurality of touch electrodes 110 is connected to one or more touch signal lines 120.

For example, the first touch electrode 112a is connected to the first touch signal line 122a through a plurality of contacts CNT. In this case, the first touch signal line 122a is connected to the first touch electrode 112a, but is insulated from other touch electrodes.

The second touch electrode 112b is connected to the second touch signal line 122b through a plurality of contacts CNT. In this case, the second touch signal line 122b is connected to the second touch electrode 112b, but is insulated from other touch electrodes.

The third touch electrode 112c is connected to the third touch signal line 122c through a plurality of contacts CNT. In this case, the third touch signal line 122c is connected to the third touch electrode 112c, but is insulated from other touch electrodes.

In the figure, one touch electrode is connected to one touch signal line, but the embodiment is not limited thereto. In other embodiments, one touch electrode can be connected to two or more touch signal lines. If a touch electrode is connected to a plurality of touch signal lines, the load of each touch electrode is reduced.

A plurality of touch signal lines 120 are respectively connected to the channels of the touch driver 200. Therefore, the touch driving signal output by the touch driver 200 is applied and charged into each of the plurality of touch electrodes 110. Moreover, by using a plurality of touch signal lines 120, the touch driver 200 senses the amount of charge charged into each of the plurality of touch electrodes 110.

The touch display device of the first embodiment of the present invention including the above components reduces the load of each of the plurality of touch electrodes 110, thereby improving image quality. In addition, the touch display device of the first embodiment of the present invention reduces the load deviation between the plurality of touch electrodes 110, thereby improving image quality.

FIG. 6 is a view showing the arrangement structure of the touch electrodes and the touch signal lines shown in FIG. 5 in detail in the touch display device according to the first embodiment of the present invention. In the following description, the same or similar details as those of the above-described FIG. 5 are not repeated or will be described briefly.

Referring to FIG. 6 , in the touch display device of the first embodiment of the present invention, each of the plurality of touch electrodes 110 is provided in a mesh form, thereby reducing the internal load deviation of each of the plurality of touch electrodes 110 . And reducing the load deviation between the plurality of touch electrodes.

Each of the first to third touch electrodes 112a to 112c includes a plurality of slits 114. A plurality of slits 114 are placed in the non-display area.

As an example, as shown in Fig. 6, each of the plurality of slits 114 is placed in a region where the thin film transistor T is placed, and the thin film transistor T drives the corresponding pixel P. In order to provide additional description, the area in which the thin film transistor T is placed is not covered by the touch electrode.

Each of the first to third touch electrodes 112a to 112c includes a plurality of unit touch electrodes UT. Each of the plurality of unit touch electrodes UT corresponds to the corresponding pixel P.

Each of the first to third touch electrodes 112a to 112c includes a plurality of first bridges B1 and a plurality of second bridges B2. The first bridge B1 and the second bridge B2 are electrically connected to the unit touch electrodes UT adjacent to each other. In particular, each of the first bridges B1 electrically connects two unit touch electrodes UT adjacent to each other along the corresponding gate line. Each of the second bridges B2 electrically connects the two unit touch electrodes UT adjacent to each other along the corresponding data line.

An additional description will be provided in which the first bridge B1 is placed to overlap the gate line or parallel to the gate line. The second bridge B2 is placed to overlap the data line or parallel to the data line.

In addition, a plurality of touch signal lines 120 are placed to overlap the plurality of slits 114, respectively. The unit touch electrodes are separated from each other by the second bridge B2, and the touch signal lines 120 are placed along the area X, and the area X is provided between the unit touch electrodes separated from each other by the second bridge B2. As described above, since the plurality of touch signal lines 120 are respectively placed to overlap with the plurality of slits 114, the load in each touch electrode is reduced, and the capacitance between the corresponding touch signal lines and the corresponding touch electrodes is reduced. Therefore, deterioration of image quality due to overlapping capacitance is avoided.

FIG. 7 is a schematic diagram showing the arrangement of the touch display device, the touch signal line, and the contact line according to the second embodiment of the present invention.

Please refer to FIG. 7 , which shows the first touch electrode 116 a and the second touch electrode 116 b of all the plurality of touch electrodes 110 . In addition, the first to fourth touch signal lines 124a to 124d of all of the plurality of touch signal lines 120 are also shown. In addition, the figure also shows a plurality of first contact lines 126a and a plurality of second contact lines 126b in all contact lines for reducing the load of each of the plurality of touch electrodes 110.

In the touch display device of the second embodiment of the present invention, the plurality of touch electrodes 110 and the plurality of touch signal lines 120 are placed to overlap each other with an insulating layer therebetween. Each of the plurality of touch electrodes 110 is connected to the one or more touch signal lines 120 through the plurality of first contacts CNT1.

In addition, the first contact line 126a and the second contact line 126b are placed to overlap each of the plurality of touch electrodes 110, and each of the plurality of touch electrodes 110 is connected to the plurality of contact lines through the second contact CNT2. Therefore, the internal load deviation of each touch electrode 110 is reduced, and the load deviation between the plurality of touch electrodes 110 is reduced.

For example, the first touch electrode 116a is connected to the first touch signal line 124a through the plurality of first contacts CNT1. In this case, the first touch signal line 124a is connected to the first touch electrode 116a, but is insulated from other touch electrodes.

The second touch electrode 116b is connected to the second touch signal line 124b through a plurality of contacts CNT1. In this case, the second touch signal line 124b is connected to the second touch electrode 116b, but is insulated from other touch electrodes.

Although not shown in the figure, the third touch electrode is connected to the third touch signal line 124c through the plurality of contacts CNT1. In this case, the third touch signal line 124c is connected to the third touch electrode but is insulated from the other touch electrodes.

In the figure, one touch electrode is connected to one touch signal line, but the embodiment is not limited thereto. In other embodiments, one touch electrode is connected to two or more touch signal lines.

A plurality of touch signal lines 120 are respectively connected to the channels of the touch driver 200. Therefore, the touch driving signal output by the touch driver 200 is applied and charged into each of the plurality of touch electrodes 110. Moreover, by using a plurality of touch signal lines 120, the touch driver 200 senses the amount of charge that is charged to each of the plurality of touch electrodes 110.

A plurality of contact lines are placed to overlap each of the plurality of touch electrodes 110. The plurality of first contact lines 126a are placed to overlap the first touch electrodes 116a. The first touch electrode 116a is connected to the first contact line 126a through the plurality of second contacts CNT2.

Herein, a plurality of first contact lines 126a are placed adjacent to the plurality of touch signal lines 124a to 124d. As described above, the first touch electrodes 116a are connected to the first touch signal lines 124a through the plurality of first contacts CNT1, and the first touch electrodes 116a are connected to the plurality of first contact lines 126a through the plurality of second contacts CNT2. Thereby reducing the load of the first touch electrode 116a. In addition, the position-based load deviation occurring in the first touch electrode 116a is reduced.

The plurality of second contact lines 126b are placed to overlap the second touch electrodes 116b. The second touch electrode 116b is connected to the second contact line 126b through the plurality of second contacts CNT2.

Herein, a plurality of second contact lines 126b are placed in the vicinity of the plurality of touch signal lines 124a to 124d. As described above, the second touch electrode 116b is connected to the second touch signal line 124b through the plurality of first contacts CNT1, and the second touch electrode 116b is connected to the plurality of second contact lines 126b through the plurality of second contacts CNT2. Thereby reducing the load of the second touch electrode 116b. In addition, the position-based load deviation occurring in the second touch electrode 116b is reduced.

The plurality of first contact lines 126a are not connected to the plurality of second contact lines 126b, but are spaced apart from the plurality of second contact lines 126b. That is to say, the plurality of touch signal lines 124a to 124d should be connected to the channels of the touch driver 200, thereby being placed to overlap with other touch electrodes except the touch electrodes connected thereto. On the other hand, the plurality of first contact lines 126a overlap the first touch electrodes 116a, but no other touch electrodes overlap. In addition, the plurality of second contact lines 126b overlap the second touch electrodes 116b, but do not overlap with other touch electrodes.

The touch display device of the second embodiment of the present invention including the above components reduces the load of each of the plurality of touch electrodes 110, thereby improving image quality. In addition, the touch display device of the second embodiment of the present invention reduces the load deviation between the touch electrodes 110 and the plurality of touch electrodes 110, thereby improving image quality.

In the driving method of the touch display device of the embodiment of the invention, a plurality of touch electrodes are sensed through one channel of the touch driver 200. Therefore, the number of channels of the touch driver 200 is reduced, thereby reducing the size of the touch driver 200 and reducing the manufacturing cost of the touch display device.

FIG. 8 is a schematic view showing the arrangement of the touch electrodes, the touch signal lines, and the contact lines shown in FIG. 7 in detail in the touch display device according to the second embodiment of the present invention. In the following description, the same or similar details as those of the above-described FIG. 7 are not repeated or will be briefly described.

Referring to FIG. 8 , in the touch display device of the second embodiment of the present invention, the plurality of touch electrodes 110 and the plurality of touch signal lines 120 are placed to overlap each other with an insulating layer therebetween. Each of the plurality of touch electrodes 110 is connected to the one or more touch signal lines 120 through the plurality of first contacts CNT1.

In addition, the first contact line 126a and the second contact line 126b are placed to overlap each of the plurality of touch electrodes 110, and each of the plurality of touch electrodes 110 is connected to the plurality of contact lines through the second contact CNT2. Therefore, the internal load deviation of each touch electrode 110 is reduced, and the load deviation between the plurality of touch electrodes 110 is reduced.

The contact lines 126a and 126b and the touch signal lines 124a to 124d are each formed of a metal having a lower resistivity than that of each of the touch electrodes 116a and 116b. Therefore, the load of each of the plurality of touch electrodes 110 is reduced, thereby improving image quality.

For example, the touch electrodes 116a and 116b are each formed of a transparent conductive material such as indium tin oxide (ITO) and/or the like. The contact lines 126a and 126b and the touch signal lines 124a to 124d are each formed of a material having a resistivity lower than that of indium tin oxide such as aluminum, or a three layer containing molybdenum (Mo), aluminum, and molybdenum.

The materials forming the contact lines 126a and 126b and the touch signal lines 124a to 124d are applied to the touch signal lines 122a to 122d applied in the first embodiment of the present invention. Therefore, the touch signal lines 122a to 122d used in the first embodiment of the present invention have a metal having a lower resistivity than a material forming the touch electrodes 112a to 112c.

In addition, the touch electrodes 112a to 112c applied in the first embodiment of the present invention include a transparent conductive material such as indium tin oxide and a metal having a resistivity lower than that of indium tin oxide. In this case, indium tin oxide is provided in the form of meshes shown in Figs. 5 and 6, and the gate line covered by indium tin oxide or the indium tin oxide covered data line forms a resistivity lower than that of indium tin oxide. Rate of metal.

In the first embodiment of the present invention, each of the touch electrodes 112a to 112c is provided in the form of a mesh. Similarly, in the touch display device of the second embodiment of the present invention, each of the touch electrodes 116a and 116b is formed in a mesh shape.

A detailed description will be provided. In FIGS. 7 and 8, the first touch electrode 116a includes a slit 134. For example, a plurality of slits 134 are provided by patterning the plate-shaped first touch electrodes 116a, and the first touch electrodes 116a have a mesh form due to the plurality of slits 134.

In addition, as shown in FIGS. 7 and 8 , when the first touch electrode 116 a includes a plurality of indium tin oxide wires, each of the plurality of indium tin oxide wires includes a plurality of slits 134 .

In this case, each of the touch signal lines 124a to 124d is placed to overlap the plurality of slits 134. Further, each of the contact lines 126a and 126b is placed to overlap the plurality of slits 134.

As described above, according to the embodiment of the invention, the touch display device reduces the load of the touch electrodes, thereby improving image quality.

In addition, according to the embodiment of the invention, the touch display device reduces the load deviation of the touch electrodes, thereby improving image quality.

Various modifications and changes can be made by those skilled in the art without departing from the scope of the invention. Therefore, the present invention covers the modifications and variations of the present invention, which are within the scope of the appended claims and their equivalents.

10‧‧‧Touch electrode
12a, 12b, 12c‧‧‧ touch electrodes
20‧‧‧Touch signal line
22a‧‧‧First touch signal line
22b‧‧‧Second touch signal line
30‧‧‧Touch Driver
32‧‧‧Multiplexer
CNT‧‧‧ contacts
100‧‧‧Touch display panel
110‧‧‧Touch electrode
112a, 112b, 112c‧‧‧ touch electrodes
114‧‧‧slit
116a, 116b‧‧‧ touch electrodes
120‧‧‧Touch signal line
122a, 122b, 122c, 122d‧‧‧ touch signal lines
124a, 124b, 124c, 124d‧‧‧ touch signal lines
126a, 126‧‧‧ contact line
134‧‧‧slit
200‧‧‧Touch Driver
210‧‧‧Multiplexer
300‧‧‧ display driver
P‧‧‧ pixels
UT‧‧‧ unit touch electrode
B1‧‧‧ first bridge
B2‧‧‧ second bridge
X‧‧‧ area
T‧‧‧film transistor
CNT1, CNT2‧‧‧ contacts

FIG. 1 is a schematic diagram of an in-cell touch display device of the prior art. FIG. 2 is a schematic diagram of a connection structure between a self-capacitance touch electrode and a touch signal line. Fig. 3 is a view showing the problem of deterioration of image quality due to load deviation of the control electrode. FIG. 4 is a schematic diagram of a touch display device according to an embodiment of the present invention. FIG. 5 is a schematic diagram showing the arrangement of the touch display device and the touch signal line according to the touch display device of the first embodiment of the present invention. FIG. 6 is a view showing the arrangement structure of the touch electrodes and the touch signal lines shown in FIG. 5 in detail in the touch display device according to the first embodiment of the present invention. FIG. 7 is a schematic diagram showing the arrangement of the touch display device, the touch signal line, and the contact line according to the second embodiment of the present invention. FIG. 8 is a schematic diagram showing the arrangement of the touch electrodes, the touch signal lines, and the contact lines shown in FIG. 7 in detail in the touch display device according to the second embodiment of the present invention.

100‧‧‧Touch display panel

110‧‧‧Touch electrode

120‧‧‧Touch signal line

200‧‧‧Touch Driver

210‧‧‧Multiplexer

300‧‧‧ display driver

Claims (19)

A touch display device includes: a touch display panel comprising a plurality of pixels defined by a plurality of gate lines and a plurality of data lines, a thin film transistor and a pixel placed in each of the pixels An electrode, and a plurality of touch electrodes; a display driver for supplying a gate driving signal to the gate lines and respectively supplying data voltages to the data lines during a display period; a touch driver for Providing a touch driving signal to the touch electrodes during a touch period; and a plurality of touch signal lines for respectively connecting the touch electrodes to the touch driver, wherein each of the touch electrodes Contains a plurality of slits. The touch display device of claim 1, wherein one touch electrode is connected to at least one touch signal line through a plurality of contacts. The touch display device of claim 2, wherein the at least one touch signal line overlaps the slits. The touch display device of claim 1, wherein the slits are placed in a non-display area. The touch display device of claim 1, wherein the slits are placed in a region where the thin film transistor is placed. The touch display device of claim 1, wherein each of the touch electrodes comprises a plurality of unit touch electrodes, a plurality of first bridges, and a plurality of second bridges, and each of the touch electrodes corresponds to a corresponding one. The pixels, and each of the first bridges and the second bridges are electrically connected to the unit touch electrodes adjacent to each other. The touch display device of claim 6, wherein each of the first bridges electrically connects two unit touch electrodes adjacent to each other along a corresponding gate line, and each of the second bridges has a corresponding data. The wires electrically connect two unit touch electrodes adjacent to each other. The touch display device of claim 7, wherein the first bridges are placed to overlap the gate lines or parallel to the gate lines, and the second bridges are placed with the data Lines overlap or are parallel to the data lines. The touch display device of claim 7, wherein the unit touch electrodes are spaced apart from each other by the second bridges. The touch display device of claim 9, wherein the touch signal lines overlap the slits, and an area is provided between the unit touch electrodes spaced apart from each other by the second bridges. The touch signal lines are placed in the area. The touch display device of claim 1, wherein each of the touch signal lines is formed of a metal having a resistivity lower than a resistivity of each of the touch electrodes. The touch display device of claim 1, wherein each of the touch electrodes comprises a transparent conductive material and a metal, and the resistivity of the metal is lower than a resistivity of the transparent conductive material, wherein the touch resist is provided in a mesh form. The transparent conductive material, and the gate lines covered along the transparent conductive material and the data lines covered by the transparent conductive material form the metal. A touch display device includes a touch display panel, and includes a plurality of pixels defined by a plurality of gate lines and a plurality of data lines, and a thin film transistor and a pixel electrode disposed in each of the pixels And a plurality of touch electrodes; a display driver for supplying a gate driving signal to the gate lines during a display period and respectively supplying data voltages to the data lines; a touch driver for Supplying a common voltage to the touch electrodes during the display period and a touch period, supplying a touch driving signal to the touch electrodes, and sensing the amount of charge of each of the touch electrodes; The control signal line is configured to respectively connect the touch electrodes to the plurality of channels included in the touch driver; and the plurality of contact lines are respectively connected to the touch electrodes. The touch display device of claim 13, wherein a touch signal line is connected to a corresponding touch electrode through the plurality of first contacts, and a touch electrode is connected to the at least two contacts through the plurality of second contacts. line. The touch display device of claim 13, wherein the contact lines are placed near the touch signal lines. The touch display device of claim 13, wherein the plurality of first contact lines of the contact lines are placed to overlap with a first touch electrode, and the plurality of second contact lines of the contact lines are Placed to overlap with a second touch electrode, and the first contact lines are spaced apart from the second contact lines. The touch display device of claim 13, wherein each of the contact lines and the touch signal lines is formed of a metal having a resistivity lower than a resistivity of each of the touch electrodes. The touch display device of claim 13, wherein each of the touch electrodes comprises a plurality of indium tin oxide wires, and each of the indium tin oxide wires comprises a plurality of slits. The touch display device of claim 18, wherein the slits are placed in a region in which the thin film transistor is placed.