KR20180045282A - Touch panel and image display device having the same - Google Patents

Abstract

The present invention relates to a touch panel and an image display device including the same. The touch panel of the present invention comprises: an image display unit in which a plurality of Rx electrodes are arranged and a plurality of Tx electrodes are arranged in a direction perpendicular to the Rx electrodes to sense a touch in a touch sensing period, and a plurality of pixel areas are formed to display an image in an image display period; a plurality of Rx link lines formed in an image non-display unit, and transmitting a first sensing signal to the Rx electrodes in the touch sensing period; a plurality of Tx link lines for transmitting a second sensing signal to the Tx electrodes in the touch sensing period; and at least one ground voltage link line formed between at least one Rx link line and at least one Tx link line, which are adjacent to each other, among the Rx link lines and the Tx link lines. Accordingly, it is possible to improve the product reliability by reducing electromagnetic interference between link lines transmitting a touch sensing signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch panel and a video display device including the touch panel.

The present invention relates to a touch panel capable of reducing electromagnetic interference between link lines transmitting a touch sensing signal and improving product reliability, and an image display apparatus including the touch panel.

BACKGROUND ART [0002] In recent years, a touch method has been applied to an image display device widely used in mobile devices or the like, in which a region of a screen is directly selected by a finger, a stylus pen, or the like in order to select a predetermined object or area displayed on the screen.

The touch panel for sensing the touch is mainly applied to a flat panel display such as a liquid crystal display (LCD), an organic light emitting diode (LCD) display, and the like.

When the touch panel is applied to a liquid crystal display device, the touch panel may be an on-cell type in which the touch panel is attached to the upper surface of the liquid crystal panel, and two electrodes constituting the touch panel constitute a liquid crystal panel (In-cell type) formed on a TFT substrate. Here, one of the two electrodes constituting the touch panel may be formed on the TFT substrate of the liquid crystal panel, and the other may be a hybrid type formed on the upper surface of the color filter substrate. In this way, a liquid crystal panel including an in-cell type touch panel or a hybrid type touch panel is also referred to as an in-cell touch panel.

In recent years, the in-cell touch panel has been mainly applied to a small-sized mobile phone model. In the case of a small-sized model, the line width of the link lines for applying the touch sensing signal to the touch electrodes is limited. Particularly, since the line-to-line distances of the link lines and the line widths of the link lines are densely arranged, the parasitic capacitors are inevitably generated between adjacent wirings because they are arranged in parallel to a narrow area of the periphery of the image display. If parasitic capacitors are frequently generated between the adjacent wirings, the touch signals are distorted, and the accuracy of touch sensing is lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a touch sensing device, in which a ground voltage link line is disposed between at least one link line among the link lines, And to provide a touch panel and a video display device including the same that can reduce defects and improve product reliability.

As described above, in order to reduce the electromagnetic interference between the link lines transmitting the touch sense signal to the touch electrodes and to improve the reliability of the product, the ground voltage link line is arranged between at least one of the link lines Thereby achieving the object. To this end, the touch panel according to the present invention includes a plurality of Rx electrodes, a plurality of Rx electrodes and a plurality of Tx electrodes arranged in a vertical direction to sense a touch during a touch sensing period, A plurality of Rx link lines configured to transmit a first sensing signal to a plurality of Rx electrodes during a touch sensing period, a plurality of Rx link lines arranged in a plurality of Tx electrodes in a touch sensing period, And at least one ground voltage link line configured between at least one Rx link line and a Tx link line adjacent to each other among a plurality of Rx link lines and a plurality of Tx link lines.

According to another aspect of the present invention, there is provided an image display apparatus including a touch panel, wherein a plurality of Rx electrodes and a plurality of Tx electrodes are arranged in a direction crossing the plurality of Rx electrodes, A plurality of Rx link lines configured to transmit a first sensing signal to a plurality of Rx electrodes during a touch sensing period, the plurality of Rx link lines comprising a plurality of pixel regions and configured to display an image in an image display period, A plurality of Tx link lines for transmitting a second sensing signal to a plurality of Tx electrodes in the plurality of Tx link lines and at least one Rx link line and a plurality of Tx link lines arranged between at least one Rx link line and a Tx link line, A touch panel including a ground voltage link line, and at least one drive integrated circuit driving a gate and a data line of the image display unit It includes.

The touch panel and the video display device including the touch panel according to the present invention having various technical features as described above can be applied to a touch panel, The electromagnetic interference between the link lines can be reduced to prevent the generation of parasitic capacitances between the link lines.

In particular, it is possible to reduce the electromagnetic interference between the link lines and prevent generation of parasitic capacitors, thereby reducing defects due to signal distortion and the like, thereby improving the reliability of the product.

1 is a configuration diagram illustrating a liquid crystal display device including an in-cell touch panel according to an embodiment of the present invention.
Fig. 2 is a layout diagram specifically showing the configuration of the "A" area and the "B" area shown in Fig.
3 is a cross-sectional view taken along line I-I 'in FIG.
FIG. 4 is a graph showing adjacent linker human load values in the case where the ground link line is not configured.
5 is a graph showing adjacent linker human load values according to the ground link line configuration.
6 is another layout diagram specifically showing the "A" area configuration shown in Fig.
FIG. 7 is a layout diagram showing the ground voltage link line width and spacing shown in FIG. 4, respectively.

The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, which are not intended to limit the scope of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

The touch panel of the present invention can be applied to various flat panel displays such as a liquid crystal display, an organic light emitting diode display, a plasma display panel, a field emission display, And may be applied to an in-cell type display panel of a flat panel display.

Hereinafter, an example in which the touch panel is applied to the liquid crystal panel of the liquid crystal display device as an in-cell type will be described for convenience of explanation.

1 is a configuration diagram illustrating a liquid crystal display device including an in-cell touch panel according to an embodiment of the present invention.

The in-cell touch panel shown in FIG. 1 is divided into an image display unit AP and an image non-display unit NP. A plurality of pixel regions are formed in the image display unit AP to display images in the image display period, Electrodes and a Tx electrode are arranged to sense the touch during the touch sensing period.

The image non-display unit NP includes a plurality of Rx link lines RL for transmitting a first sensing signal to a plurality of Rx electrodes during a touch sensing period, a plurality of Rx sensing lines for transmitting a plurality of sensing signals to a plurality of Tx electrodes And a ground voltage link line RX between the Tx link line TL and at least one Rx link line RL and a plurality of Tx link lines TL adjacent to each other among a plurality of Rx link lines RL and Tx link lines TL. (GL) are arranged.

More specifically, the in-cell touch panel uses a plurality of Tx electrodes and a plurality of Rx electrodes as a common electrode to simultaneously perform a video display function and a touch sensing function, In operation, the function of the touch electrode is performed together. Here, a mutual capacitance is generated between a plurality of Tx electrodes and a plurality of Rx electrodes arranged vertically to each other between the touch sensors, and the amount of mutual capacitance generated when touching is measured to recognize whether or not the touch is detected .

As described above, the in-cell touch panel uses a plurality of Rx electrodes or Tx electrodes required for touch sensing as a common electrode for displaying an image, and each Rx electrode and Tx electrode are configured to face each other in the vertical direction, The image display period and the touch sensing period are time-divided so that the noise component generated in the video display period does not affect the touch sensing period.

Although not shown in detail, the in-cell touch panel is configured such that a liquid crystal layer is formed between a lower array substrate and an upper color filter substrate.

A plurality of Rx electrodes are arranged parallel to each other along the direction of the gate lines, and a thin film transistor, a pixel electrode, and the like are formed in each pixel region defined by intersecting the gate and data lines in a matrix form on the image display unit AP of the lower substrate . A black matrix and a color filter are formed on the color filter substrate, and a plurality of Tx electrodes are formed in parallel along the direction of the data lines.

The pixels of each pixel region are turned on by the electric field between a data signal applied to the pixel electrode and a common voltage applied to a plurality of Tx electrodes or Rx electrodes used as a common electrode, So that the image is displayed. At this time, a plurality of Tx electrodes or Rx electrodes serve as common electrodes corresponding to the pixel electrodes.

On the other hand, in the touch sensing period, a plurality of Tx electrodes and Rx electrodes serve as sensing electrodes of the touch panel. At this time, a plurality of Tx electrodes and Rx electrodes are applied with a touch voltage (for example, Is applied. Then, the touch position is determined by detecting a change in the touch sensing signal (voltage due to capacitance change) received through each of the Tx electrode and the Rx electrode.

When the in-cell touch panel, the driving module, and the back light unit are combined and made into a liquid crystal display device, the driving timing of a plurality of gate lines and data lines is controlled in the image non-display portion NP of the in- At least one driving integrated circuit (100) for driving a plurality of gates and data lines to display an image through the pixel cells is provided.

1 shows an example in which the driving IC 100 is mounted on a single chip to drive each pixel cell of the image display unit AP. However, the non-display area NP of the in- A gate driving circuit, a data driving circuit, and a timing control circuit may be formed through a flexible circuit board or the like to form a liquid crystal display module.

Fig. 2 is a layout diagram specifically showing the configuration of the "A" area and the "B" area shown in Fig.

The plurality of Tx electrodes TL1 to TLn are arranged in parallel along the data line direction and the plurality of Rx electrodes RL1 to RLn are arranged in a direction perpendicular to the plurality of Tx electrodes, that is, along the gate line direction. Accordingly, a plurality of Rx link lines RL1 to RLn for applying the first sensing signal to a plurality of Rx electrodes along the one side area and the other side area of the image non-display area NP are arranged side by side. Here, n is a natural number excluding 0.

The plurality of Rx link lines RL may be divided into odd-numbered and even-numbered Rx electrodes and arranged to apply a first sensing signal to each of the Rx electrodes on one side and the other side. That is, the one side region which is the direction of the "A" region is divided into odd-numbered Rx link lines RL1 to RLn-1 so as to apply the first sensing signal to the odd-numbered Rx electrodes of the plurality of Rx link lines RL1 to RLn, Numbered Rx link lines RL2 to RLn so as to apply the first sensing signal to the even-numbered Rx electrodes of the plurality of Rx link lines RL1 to RLn as one lateral area in the "B" To RLn may be arranged.

A plurality of Tx link lines TL1 to TLn for applying a second sensing signal to a plurality of Tx electrodes adjacent to a plurality of Rx link lines RL1 to RLn arranged in the image non-display portion NP are arrayed side by side do.

At least one of the plurality of Rx link lines RL1 to RLn and the plurality of Tx link lines TL1 to TLn may be disposed adjacent to each other. At this time, electromagnetic interference may occur between the Rx link line and the Tx link line, which are adjacent to each other, depending on the difference between the first sensing signal and the second sensing signal level.

2, at least one Rx link line RL and a plurality of Rx link lines Rx and Rx adjacent to each other among a plurality of Rx link lines RL1 to RLn and Tx link lines TL1 to TLn are provided to reduce electromagnetic interference. A ground voltage link line GL is arranged between the Tx link lines TL. A ground voltage that is a low potential voltage may be applied to the ground voltage link line GL, or a ground voltage may be applied.

3 is a cross-sectional view taken along line I-I 'in FIG.

As shown in FIG. 3, the plurality of Rx link lines RL1 to RLn and the plurality of Tx link lines TL1 to TLn may be formed in different manufacturing fault layers.

In other words, since the plurality of Rx electrodes and the plurality of Tx electrodes are arranged and configured in different manufacturing fault layers, the plurality of Rx link lines RL1 to RLn and the plurality of Tx link lines TL1 to TLn are also connected to the Rx electrode and the Tx electrode Respectively.

Thus, the ground voltage link line GL formed between the at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other is connected to the Rx link line RL1 or the Tx link line TL1 adjacent to each other. And is disposed adjacent to the Rx link line RL1 or the Tx link line TL1. Thus, the ground voltage link line GL is disposed between at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other, so that electromagnetic interference between the Rx link line and the Tx link line adjacent to each other can be reduced.

FIG. 4 is a graph showing adjacent linker human load values in the case where the ground link line is not configured. And FIG. 5 is a graph showing adjacent linker human load values according to the ground link line configuration.

4, when the ground voltage link line GL is not formed between at least one Rx link line RL1 and the Tx link line TL1 which are adjacent to each other, the Rx link line RL1 and the Tx link line RL1, Electromagnetic interference occurs between the Rx link line Rl1 and the Tx link line TL1 due to electromagnetic interference between the Rx link line Rx and the Tx link line TL1.

5, since the ground voltage link line GL is disposed between at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other, the Rx link line RL1 and the Tx link line RL1 adjacent to each other, The load on each of the Rx link line RL1 and the Tx link line TL1 can be kept relatively equal by reducing the electromagnetic interference between the Rx link line TL1 and the Rx link line TL1.

However, since the interval between each of the Rx link lines RL1 to RLn and the Tx link lines TL1 to TLn has become more and more narrow in recent years, the respective Rx link lines RL1 to RLn and the Tx link lines TL1 to TLn And the width of the ground voltage link line GL and the constituent interval, etc., in advance.

Particularly, by changing the design of the ground voltage link line GL disposed between the at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other, the line width and the interval are changed to further reduce the electromagnetic interference phenomenon It becomes possible.

6 is another layout diagram specifically showing the "A" area configuration shown in Fig.

6, a plurality of Rx link lines RL1 to RLn for applying a first sensing signal to a plurality of Rx electrodes are arranged side by side along one side area and the other side area of the image non-display area NP . A plurality of Tx link lines TL1 to TLn for applying a second sensing signal to a plurality of Tx electrodes adjacent to the plurality of Rx link lines RL1 to RLn are arranged side by side.

At this time, in order to reduce electromagnetic interference due to the first and second sensing signal level differences between the Rx link line RL1 and the Tx link line TL1 which are adjacent to each other, at least one Rx link line RL1 and a Tx link A ground voltage link line GL is arranged between the lines TL1.

The width of the ground voltage link line GL formed between the Rx link line RL1 and the Tx link line TL1 adjacent to each other is smaller than the width of each of the Rx link lines RL1 to RLn and the plurality of Tx link lines TL1 to TLn. So that the interval between the at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other can be wider. That is, as the width of the voltage link line GL increases, the interval between the at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other can be widened. Electromagnetic interference between the at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other by such a wide width can also be reduced. Therefore, it is preferable that the width of the voltage link line GL is increased corresponding to the width of the image non-display portion NP.

6, the width of the ground voltage link line GL is made wider than the width of the plurality of Rx link lines RL1 to RLn and the plurality of Tx link lines TL1 to TLn for at least one part or area , The interval between at least one Rx link line RL1 and the Tx link line TL1 adjacent to each other can be wider. That is, the width of the voltage link line GL can be broadened according to the width of the image non-display portion NP and the wiring layout condition of the adjacent link lines. The electromagnetic interference between the Rx link line RL1 and the Tx link line TL1 can be suppressed because the interval between the Rx link line RL1 and the Tx link line TL1 which are adjacent to each other by a wider width is widened Can be reduced.

FIG. 7 is a layout diagram showing the width and spacing of the ground voltage link line GL shown in FIG. 4, respectively. Table 1 below shows the load measurement results according to the line width of the ground voltage link line GL, the spacing between the Rx link line RL1 and the Tx link line TL1, and the change thereof.

[Table 1]

Referring to Table 1 together with FIG. 7A, the ground voltage link line GL is constructed between the Rx link line RL1 and the Tx link line TL1 which are adjacent to each other, and the width of the ground voltage link line GL It can be confirmed that the electromagnetic interference and load measurement results are lower even if the distance between the Rx link line (RL1) and the Tx link line (TL1), which are adjacent to each other without change, is further separated by 10um and 20um.

Referring to Table 1 together with FIG. 7 (b), the ground voltage link line GL is configured between the Rx link line RL1 and the Tx link line TL1 which are adjacent to each other, and the Rx link lines RL1 and RL1 adjacent to each other, It is confirmed that even if the distance between the Tx link lines TL1 is further separated by more than 10 .mu.m and the width of the ground voltage link line GL is changed only by a predetermined width, electromagnetic interference and load measurement results are further lowered. As a result, it can be confirmed that the influence of the width change of the ground voltage link line GL is more affected than the change in spacing between the adjacent Rx link line RL1 and the Tx link line TL1.

Finally, referring to Table 1 together with FIG. 7 (c), the ground voltage link line GL is constructed between the adjacent Rx link line RL1 and the Tx link line TL1, and the ground voltage link line GL And the distance between the Rx link line RL1 and the Tx link line TL1 which are adjacent to each other by a widening width is ensured, it is confirmed that the electromagnetic interference and load measurement results are the lowest. It can be seen that the electromagnetic interference and load measurement result shows that the gap between the ground voltage link line (GL) can be maximized.

As described above, the touch panel and the image display device including the touch panel according to the embodiment of the present invention include a plurality of Rx link lines RL for transmitting the first and second sensing signals to the Rx and Tx electrodes as the touch electrodes, By arranging the ground voltage link line GL between at least one of the link lines adjacent to each other among the Tx link lines TL, electromagnetic interference between the adjacent link lines can be reduced to prevent generation of parasitic capacitances between adjacent link lines have.

In this way, electromagnetic interference between the plurality of link lines can be reduced and generation of parasitic capacitors can be prevented, thereby reducing defects due to signal distortion and the like, thereby improving the reliability of the product.

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 following claims. It will be possible.

AP:
NP: image ratio display section
100: drive integrated circuit
RL1 to Rn: a plurality of Rx link lines
TL1 to Tn: a plurality of Tx link lines
GL: Ground voltage link line

Claims (10)

A plurality of Rx electrodes and a plurality of Tx electrodes arranged in a direction intersecting with the plurality of Rx electrodes to detect a touch between the touch sensors and display a video in a video display period;
A plurality of Rx link lines arranged in the image non-display unit and transmitting a first sensing signal to the plurality of Rx electrodes during the touch sensing period;
A plurality of Tx link lines for transmitting a second sensing signal to the plurality of Tx electrodes during the touch sensing period; And
At least one ground voltage link line configured between at least one Rx link line and a Tx link line adjacent to each other among the plurality of Rx link lines and the plurality of Tx link lines;
.
The method according to claim 1,
The at least one ground voltage link line
Wherein each of the Rx link lines or the Tx link line is disposed adjacent to the at least one Rx link line or the Tx link line adjacent to each other.
3. The method of claim 2,
The at least one ground voltage link line width
Wherein a width of at least one of the Rx link lines and the Tx link lines adjacent to each other is wider than the width of the plurality of Rx link lines or the plurality of Tx link lines, Touch panel to ensure.
3. The method of claim 2,
The at least one ground voltage link line width
Wherein at least one of the plurality of Rx link lines and the plurality of Tx link line widths are wider than the predetermined Rx link line and the plurality of Tx link line widths are adjacent to each other, A touch panel that is wider than the Tx link line.
3. The method of claim 2,
The at least one ground voltage link line width
Wherein a width of at least one of Rx link lines and Tx link lines adjacent to each other is wider than that of another Rx or Tx link line at the other adjacent side A touch panel to be placed.
A plurality of Rx electrodes and a plurality of Tx electrodes arranged in a direction intersecting with the plurality of Rx electrodes so as to detect a touch between the touch sensors and display a video in a video display period, A plurality of Rx link lines configured to transmit a first sensing signal to the plurality of Rx electrodes during the touch sensing period, a plurality of Tx link lines configured to transmit a second sensing signal to the plurality of Tx electrodes during the touch sensing period, And at least one ground voltage link line configured between at least one Rx link line and a Tx link line adjacent to each other among the plurality of Rx link lines and the plurality of Tx link lines; And
At least one driver integrated circuit driving a gate and a data line of the image display unit;
And a display device.
The method according to claim 6,
The at least one ground voltage link line
Wherein each of the Rx link lines or the Tx link line is disposed adjacent to at least one Rx link line or a Tx link line adjacent to each other,
8. The method of claim 7,
The at least one ground voltage link line width
Wherein a width of at least one of the Rx link lines and the Tx link lines adjacent to each other is wider than the width of the plurality of Rx link lines or the plurality of Tx link lines, And a display device.
8. The method of claim 7,
The at least one ground voltage link line width
Wherein at least one of the plurality of Rx link lines and the plurality of Tx link line widths are wider than the predetermined Rx link line and the plurality of Tx link line widths are adjacent to each other, So as to be wider than the Tx link line.
8. The method of claim 7,
The at least one ground voltage link line width
Wherein a width of at least one of Rx link lines and Tx link lines adjacent to each other is wider than that of another Rx or Tx link line at the other adjacent side To be arranged.

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