KR102175787B1 - Touch screen and display device including the same - Google Patents

Abstract

The present invention includes: a plurality of Tx electrodes extending in a first direction to the display area on a first substrate in which a display area is defined and spaced apart from each other in a second direction perpendicular to the first direction; An insulating layer formed over the plurality of Tx electrodes and over the entire display area of the first substrate; First and second bar type Rx electrodes in the form of straight bars extending in the second direction above the insulating layer and provided at the leftmost and rightmost sides of the display area, respectively, and the first and second bar types It is located between the Rx electrodes and is formed at a predetermined interval, and is formed in parallel with the plurality of Tx electrodes by bending a first portion in parallel with the first and second bar type Rx electrodes and at both ends of each of the first portions. A touch screen including a plurality of central Rx electrodes consisting of a second portion and a third portion, and a display device having the same are provided.

Description

Touch screen and display device including the same

The present invention relates to a touch screen, and more particularly, to a touch screen capable of improving touch sensitivity in an outer portion of a display area, and a display device having the same.

The present invention relates to a touch screen, and more particularly, to a touch screen that improves touch sensing capability by suppressing a touch from being detected in a portion where a signal from a touch sensor is weak, and a display device having the same.

Touch screens (LCD), plasma display panels (PDP), organic electro-luminescent display devices, etc., which are used according to the user's request, are used in display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), and an organic electro-luminescent display device. Touch Screen) is most commonly used by attaching it to the front of the image display part of the display device.

That is, by attaching a touch screen to the upper front of the image display part of a display device such as LCD, PDP, OLED, and cathode ray tube (CRT), the touch screen is used as an auxiliary function.

Such a touch screen is one of the input means. When a person presses a specific point on the screen with a finger or a pen, the output signal corresponding to that point is displayed on the screen, allowing the user to input and output desired information more conveniently. It is common to have a touch sensor for detecting a two-dimensional touch point on the screen as a means of being there.

On the other hand, since the touch screen having such a configuration should have a size that can be distinguished from each other mainly pressed by a human finger or a dedicated pen, the size of the portion that can be displayed on the screen when the size of the screen is limited And the number is limited.

1 is a plan view showing an enlarged display area of a conventional touch screen.

As shown, the touch screen 10 includes a plurality of Tx electrodes 15 in the form of straight bars extending in the x-axis direction in order to determine the location of the touch on the two-dimensional plane. A plurality of Rx electrodes 20 are provided at regular intervals in the y-axis direction, extend in the y-axis direction, and have a straight bar shape, are provided at regular intervals in the x-axis direction, and the Tx In order to prevent a short circuit between the electrode 15 and the Rx electrode 20, an insulating layer (not shown) is interposed therebetween to form a shape spaced apart from each other by a predetermined interval.

At this time, the touch screen 10 having this configuration detects a change in capacitance generated between the adjacent Tx electrodes 15 and Rx electrodes 20 to determine the presence or absence of a touch, and performs an operation according to the touched part. Is done.

More precisely, the Tx electrode 15 serves as a component for applying a touch driving voltage, and the Rx electrode 20 serves to sense a change in capacitance, and the Tx electrode 15 is sequentially When the driving voltage is applied, the Rx electrode 20 determines whether a change in capacitance occurs when a signal is applied to the Tx electrode 15, thereby determining the part where the touch occurs, that is, the touch point.

In the case of a conventional touch screen 10 having such a configuration, most (in the center of the display area), when one touch event occurs, a plurality of Tx electrodes 15 and Rx electrodes 20 in the touched portion A change in capacitance occurs at

Therefore, it is possible to read an accurate touch point through interpolation or algorithm processing on sensing data sensed by a plurality of Tx electrodes 15 and Rx electrodes 20.

However, the conventional touch screen 10 having such a configuration is shown in Fig. 2 (a diagram showing a touch point touched on the edge, corner and center of the display area in the conventional touch screen) and Fig. 3 (Fig. 2). As shown in the table showing the change in capacitance by the Rx and Tx electrodes located in the vicinity of each of the touch points shown in Fig.), the touch sensitivity is different for each location where the touch occurs, so that the touch operation is not performed. There is a situation where touch defects are occurring.

That is, when a touch event occurs in most areas of the touch screen 10, a reaction according to the capacitance change appears in the plurality of Tx electrodes 15 and Rx electrodes 20 as described above, but the touch screen 10 When the touch event occurs at the edge and corner of ), the area where the Tx electrode 15 and the Rx electrode 20 react is narrow, so that sufficient data is secured for interpolation or algorithm processing. Is difficult.

This results in a decrease in touch sensitivity and a decrease in accuracy of touch sensing.

In particular, in the case of the corner portion of the display area, only a very limited change in capacitance occurs, resulting in a more severe reduction in touch sensitivity.

In the drawing, among the first to eighth touch points (#1 to #8), the first to fourth touch points (#1 to #4) in which the Tx and Rx electrodes (15, 20) are located are at least four parts. As the capacitance change is detected above, the touch sensitivity is excellent, and the corresponding operation is accurately performed when a touch event occurs, but the fifth to sixth touch points (#5, #6) located at the edge of the display area are As compared to the first to fourth touch points (#1 to #4), the change in capacitance is detected in the third part, so that the touch sensitivity is relatively reduced, so that when a touch event occurs, the corresponding operation is not performed intermittently. I could see that it was not.

And, in the case of the 7th to 8th touch points (#7, #8) located at the corners of the display area, they are significantly lowered compared to the first to fourth touch points (#1 to #4). Since the touch sensitivity is remarkably reduced as the capacitance change is detected, the correct touch point is not recognized when a touch event occurs, so that the corresponding operation is hardly performed, so that the ability to respond to the touch at the time of touch is rapidly deteriorated.

In order to solve the above problem, an object of the present invention is to provide a touch screen having excellent touch sensitivity even at an edge portion and a corner portion of a display area, and a display device having the same.

The touch screen according to the present invention for achieving the above object includes a plurality of touch screens extending in a first direction to the display area on a first substrate in which a display area is defined, and spaced apart at predetermined intervals in a second direction perpendicular to the first direction. With the Tx electrode; An insulating layer formed over the plurality of Tx electrodes and over the entire display area of the first substrate; First and second bar type Rx electrodes in the form of straight bars extending in the second direction above the insulating layer and provided at the leftmost and rightmost sides of the display area, respectively, and the first and second bar types It is located between the Rx electrodes and is formed at a predetermined interval, and is formed in parallel with the plurality of Tx electrodes by bending a first portion in parallel with the first and second bar type Rx electrodes and at both ends of each of the first portions. And a plurality of central portion Rx electrodes consisting of a second portion and a third portion.

At this time, both ends of the plurality of Tx electrodes are located between the first and second bar type Rx electrodes.

And each second portion of the central Rx electrode is bent to the left with respect to each first portion connected thereto, and each third portion of the central Rx electrode is bent to the right with respect to each first portion connected thereto. In this case, between the first bar-type Rx electrode of the display area and the central portion Rx electrode closest thereto, a first auxiliary Rx electrode positioned on a line in parallel with the third portion is provided, and A second auxiliary Rx electrode disposed on a line parallel to the second portion is provided between the second bar-type Rx electrode and the central Rx electrode closest thereto.

In addition, each of the plurality of second portions and the first Rx auxiliary electrode are located outside the Tx electrode provided at the uppermost side in the display area, and each of the plurality of third portions and the second Rx auxiliary electrode comprises the It is characterized in that it is located outside the Tx electrode provided at the lowermost side in the display area.

And each second portion of the central Rx electrode is bent to the right with respect to each first portion connected thereto, and each third portion of the central Rx electrode is bent to the left with respect to each first portion connected thereto. In this case, between the first bar-type Rx electrode of the display area and the central portion Rx electrode closest thereto, a first auxiliary Rx electrode positioned on a line in parallel with the second portion is provided. A second auxiliary Rx electrode disposed on a line parallel to the third portion is provided between the second bar-type Rx electrode and the central Rx electrode closest thereto.

And each of the plurality of second portions and the first Rx auxiliary electrode are located outside the Tx electrode provided at the uppermost side in the display area, and each of the plurality of third portions and the second Rx auxiliary electrode are the display It is characterized in that it is located outside the Tx electrode provided at the bottom of the region.

In addition, it includes a protective layer formed over the first and second bar-type Rx electrodes and a plurality of central Rx electrodes.

A display device according to an embodiment of the present invention includes the touch screen according to any one of claims 1 to 9; And a display device provided under the touch screen.

The display device may be any one of a liquid crystal panel, an organic light emitting device, and a plasma display device. In this case, the liquid crystal panel includes: a second substrate in which a plurality of pixel regions are defined; A pixel electrode provided for each pixel area on the second substrate; A third substrate facing the second substrate; It is characterized by including a color filter layer provided on the inner surface of the third substrate.

In addition, a common electrode is provided on the color filter layer of the third substrate, or a second insulating layer is interposed above the pixel electrode of the second substrate to correspond to each pixel region, It features a common electrode having a first opening.

In addition, a plurality of the pixel electrodes are provided in a bar shape in each pixel region, and a plurality of common electrodes alternately with the pixel electrodes and having a bar shape are provided on the second substrate.

The touch screen according to the present invention has the effect of improving the sensitivity of touch recognition at the edge and corner of the display area by providing the Rx electrode in a form surrounding the side end of the Tx electrode at the edge of the display area. There is an effect of improving the performance capability by the touch operation by improving touch recognition at the edge and corner.

1 is a plan view showing an enlarged display area of a conventional touch screen.
FIG. 2 is a diagram illustrating touch points touched on an edge portion, a corner portion, and a center portion of a display area in a conventional touch screen.
3 is a diagram showing a table showing a change in capacitance by Rx and Tx electrodes located around the touch points shown in FIG. 2;
4 is a plan view of a display area of a touch screen according to an embodiment of the present invention
5 is a plan view of a display area of a touch screen according to a modified example of the embodiment of the present invention.
6 is a view showing points touched with respect to a center portion, an edge portion, and a corner portion of a display area on a touch screen according to an embodiment of the present invention.
FIG. 7 is a diagram showing a table showing a change in capacitance by Rx and Tx electrodes located around the touch points shown in FIG. 6.
FIG. 8 is a cross-sectional view of a portion of FIG. 4 taken along the cutting line VIII-VIII.
9 is a cross-sectional view of a portion of a display area of a liquid crystal display device having a touch screen according to an embodiment of the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described with reference to the drawings.

4 is a plan view of a display area of a touch screen according to an embodiment of the present invention. At this time, for convenience of explanation, the order of 1 to n is given to the Tx electrode 190 from the upper side to the lower side of the display area AA, and the Rx electrode 196 from the left to the right side of the display area AA. The order of 1 to m is sequentially assigned, and as a characteristic configuration of the present invention, the Rx electrode formed on the left side of the first Rx electrode Rx1, that is, the leftmost side of the display area AA, is RxA and the m-th Rx electrode ( The Rx electrode formed on the right side of Rxm), that is, the rightmost side of the display area AA, is defined as RxB, the Tx electrode is assigned a reference numeral 190, and the Rx electrode is assigned a reference numeral 196.

As shown, in the touch screen 100 according to the embodiment of the present invention, a plurality of Tx electrodes 190 extending in the x-axis direction are perpendicular to the x-axis direction in order to determine the location of the touch on the two-dimensional plane. A plurality of Rx electrodes 196 are formed at predetermined intervals in a y-axis direction, and a plurality of Rx electrodes 196 extending in a y-axis perpendicular to the x-axis are formed at predetermined intervals.

At this time, in order to prevent a short circuit between the plurality of Tx electrodes 190 and the Rx electrodes 196 and implement capacitance between the Tx electrode 190 and the Rx electrode 196, the plurality of Tx electrodes 190 and the An insulating layer (not shown) is provided between the plurality of Rx electrodes 196.

At this time, as the most characteristic configuration of the present invention, each Rx electrode 196 is formed in a bent shape at the upper and lower edge portions of the display area AA, and the left and right sides of the display area AA It is characterized in that the Rx electrode 196 is provided for the edge portion.

That is, in the touch screen 100 according to the embodiment of the present invention, the 0th Rx electrode (RxA 196d) having a relatively narrow width compared to the Tx electrode 190 at the leftmost edge of the display area AA. ) Extends in the y-axis direction and has a straight bar shape without a bent part, and has a relatively narrow width compared to the Tx electrode 190 even at the rightmost edge of the display area AA. The (m+1)th Rx electrode (RxB(196e)) extends in the y-axis direction and has a straight bar shape without a bent part, and the 0th Rx electrode (RxA(196d)) and the first The (m+1) Rx electrode (RxB(196e)) is bent at both ends of the first portion 196a extending in the y-axis direction and the first portion 196a to extend in a direction parallel to the x-axis. It is characterized in that the first to m-th electrodes Rx1 to Rxm, which have the configuration of the second and third parts 196b and 196c, are sequentially spaced apart from each other at a predetermined interval, and are formed at a predetermined interval.

At this time, the second portion 196b of each of the first to m-th Rx electrodes Rx1 to Rxm having these two bent portions is a first portion of each Rx electrode 196 whose end is immediately adjacent to the left. It is formed to be spaced apart from 196a to an extent to prevent a short circuit, and thus forms a shape surrounding a predetermined width outside the first Tx electrode Tx1.

In addition, the third portion 196c of each of the first to m-th Rx electrodes 196 (Rx1 to Rxm) is shorted with the first portion 196a of each Rx electrode 196 whose end is immediately adjacent to the right. It is formed to be spaced apart to the extent that it prevents the formation of a shape that surrounds the outer predetermined width of the n-th electrode Txn.

At this time, as a modified example, refer to FIG. 5 (a plan view of a display area of a touch screen according to a modified example of the embodiment of the present invention), and the second part 196b and the third part 196c have their respective bent portions. It is self-evident that the opposite can be done.

Due to the constitutional characteristics of the Rx electrode 196, the side end of the n-th electrode Txn positioned between the 0th Rx electrode RxA and the first Rx electrode Rx1 in the lower left of the display area AA. Is exposed by the Rx electrode 196 and positioned between the m Rx electrode Rxm and the m+1 Rx electrode RxB in the upper right of the display area AA. The side end of is exposed by the Rx electrode 196.

Therefore, in order to prevent the portion of the Tx electrode 190 from being exposed by the Rx electrode 196 at the edge portion of the display area AA, the 0th Rx electrode is outside the side end of the nth Tx electrode Txn ( Between RxA) and the first Rx electrode Rx1, the first auxiliary Rx electrode (RxC1(196f) in the same shape as the third portion 196c of the first to m Rx electrodes Rx1 to Rxm, that is, in the form of an island) ) Is provided, and the first to m Rx electrodes Rx1 to Rxm are disposed between the m Rx electrode Rxm and the m+1 Rx electrode RxB outside the side end of the first Tx electrode Tx1. It is characterized in that the second auxiliary Rx electrode (RxC2 (196g)) is provided in the same shape as the second portion 196b of, that is, in the form of an island.

In this case, in the case of the modified example, the side surfaces of the Tx electrode 190 are exposed to the upper left and lower right sides of the display area AA, as shown in FIG. 5, and in this case also, the upper left and lower right sides are exposed. The first and second auxiliary Rx electrodes RxC1 (196f) and RxR2 (196g) are provided.
Referring to FIGS. 4 and 5 together, a plurality of central Rx electrodes Rx1 to Rxm are disposed between the first and second bar type Rx electrodes RxA and RxB, and each of the central Rx electrodes Rx1 to Rxm is The first portion 196a in the form of a straight line without a bent portion, and one end of the first portion 196a (upper in FIG. 4 and lower in FIG. 5) are bent in the direction of the first bar-type Rx electrode RxA, and the Tx electrode and Bending in the direction of the second bar-type Rx electrode (RxB) at the second portion (196b in FIG. 4, 196c in FIG. 5) and the other end (lower in FIG. 4, upper in FIG. 5) of the second portion formed in parallel And a third portion (196c in FIG. 4, 196b in FIG. 5) formed parallel to the Tx electrode. In addition, between the first bar-type Rx electrode (RxA) and the central portion Rx electrode (Rx1) closest thereto, the first auxiliary Rx electrode located in parallel with the third portion (196c in Fig. 4, 196b in Fig. 5) (RxC1 in Fig. 4, RxC2 in Fig. 5) is formed, and a second part (196b in Fig. 4, 196c in Fig. 5) is formed between the second bar-type Rx electrode (RxB) and the central Rx electrode (Rxm) closest thereto. A second auxiliary Rx electrode (RxC2 in FIG. 4, RxC1 in FIG. 5) positioned on a line in parallel with is formed. In this case, in FIG. 4, the plurality of second portions 196b and the second auxiliary Rx electrodes RxC2 are positioned outside the Tx electrode provided at the uppermost side in the display area, and each of the plurality of third portions 196c and The first auxiliary Rx electrode RxC1 is located outside the Tx electrode provided at the lowermost side in the display area. In addition, in FIG. 5, a plurality of second portions 196c and a second auxiliary Rx electrode RxC1 are positioned outside the Tx electrode provided at the lowermost side in the display area, and each of the plurality of third portions 196b and The first auxiliary Rx electrode RxC2 is located outside the Tx electrode provided at the uppermost side in the display area.

Meanwhile, referring to FIG. 4, in the display area AA of the touch screen 100 according to an exemplary embodiment of the present invention, the display area AA is in a form intersecting with the Rx electrode 196 having the above-described configuration, in the x-axis direction. First to n Tx electrodes 190 (Tx1 to Txn) extending and having a straight bar shape in the y-axis direction are formed.

At this time, both ends of each of the first to nth Tx electrodes 190 (Tx1 to Txn) are located inside the 0th Rx electrode RxA and the m+1th Rx electrode RxB, respectively.

Meanwhile, in the drawing, each of the Tx electrodes 190 is shown to form a straight bar shape having the same width extending in the x-axis direction in the display area AA.

However, each of the Tx electrodes 190 is formed in an island shape between two adjacent Rx electrodes 196 and is internally connected between adjacent Tx electrodes in the x-axis direction through a connection pattern (not shown). Or, a connection wiring (not shown) is provided in the Y direction extending from the Rx electrode 196, and the connection wiring and each island-shaped Tx electrode (not shown) are connected, and the connection wiring (not shown) ), a channel wiring (not shown) electrically connected to a connection wiring (not shown) connected to the Tx electrode extending in the same x-axis direction is provided, so that a driving voltage can be applied for each row to the Tx electrodes provided in the same row. Configuration can also be achieved.

The touch screen 100 having such a configuration detects a change in capacitance generated between the adjacent Tx electrodes 190 and Rx electrodes 196 to determine the presence or absence of a touch, and performs an operation according to the touched portion. .

Each of the Tx electrodes 190 serves as a component for applying a touch driving voltage, and each Rx electrode 196 serves to sense a change in capacitance, and the Tx electrodes 190 are sequentially scanned. When a driving voltage is applied, the Rx electrode 196 determines which Tx electrode 190 has a change in capacitance when a signal is applied to determine a touch-generated part, that is, a touch point.

On the other hand, the touch screen 100 according to an embodiment of the present invention has a plurality of Tx electrodes 190 and Rx electrodes 196 even at the outermost edges of the display area AA, that is, edge portions and corner portions. ) Can detect a number of changes in capacitance, it has the advantage of fundamentally suppressing a phenomenon in which the touch sensitivity at the edge and corner portions of the display area AA is deteriorated.

That is, in the touch screen 100 according to the embodiment of the present invention having such a configuration, one touch event occurs for the edge portion and the corner portion of the display area AA, including the central portion of the display area AA. In the touched part, a change in capacitance occurs at the plurality of Tx electrodes 190 and Rx electrodes 196, and sensing sensed by the plurality of Tx electrodes 190 and Rx electrodes 196 It is characterized by being able to read accurate touch points through data interpolation or algorithm processing.

On the other hand, although not shown in the drawing, the touch screen 100 according to the embodiment of the present invention having such a configuration of a plurality of Tx electrodes 190 and Rx electrodes 196 is provided at one end of each of the Tx electrodes 190 An x-direction sensing circuit (not shown) is mounted through a first link wire (not shown), and the like is mounted at one end of each Rx electrode 195 through a plurality of second link wires (not shown). A direction sensing circuit (not shown) is mounted.

6 is a view showing points touched on the center, edge, and corner portions of the display area AA on the touch screen according to an embodiment of the present invention, and FIG. 7 is It is a diagram showing a table showing the intensity of change in capacitance due to the Rx and Tx electrodes located around it.

6 and 7, in the case of a touch screen according to an exemplary embodiment of the present invention, a touch event is generated in the display area AA, which is located in the center of the first to eighth touch points #1 to #8. The first to fourth touch points (#1 to #4) have excellent touch sensitivity as a change in capacitance is sensed in 4 to 6 parts like the conventional touch screen (1 in FIG. 1). It can be seen that the corresponding operation is accurately performed.

In addition, in the touch screen 100 according to the embodiment of the present invention, the capacitance change in 3 to 4 parts of the fifth and sixth touch points #5 and #6 positioned at the edge of the display area AA. As is detected, the touch sensitivity is reduced by a predetermined amount in the center part compared to the center part, but the part that detects the change in capacitance is increased by at least one place compared to the conventional touch screen (1 in FIG. 1). It can be seen that the performance ability of is improved.

Meanwhile, in the case of the seventh and eighth touch points (#7, #8) positioned at the corners of the display area AA, the touch screen 100 according to the embodiment of the present invention has a power outage in at least two portions. As the capacitance change is detected, at least one portion for detecting the change in capacitance is increased compared to the conventional touch screen (1 in FIG. 1), thereby improving the ability to perform an operation corresponding to the occurrence of a touch event.

Hereinafter, a cross-sectional configuration of a touch screen according to an embodiment of the present invention having the above-described configuration will be briefly described.

FIG. 8 is a cross-sectional view of a portion of FIG. 4 taken along line VIII-VIII.

Transparent insulating substrate 189 For example, on a substrate made of glass or plastic, or a transparent film, the first to nth Tx electrodes 190 in the form of straight bars or islands extending in the x-axis direction are y It is spaced at regular intervals in the axial direction and is equipped with a number of them.

And made of silicon oxide (SiO ₂ ) or silicon nitride (SiNx) as an inorganic insulating material on the plurality of Tx electrodes 190, or made of photo acryl or benzocyclobutene (BCB) as an organic insulating material. An insulating layer 192 is formed on the entire surface of the substrate.

Further, the 0th and m+1th Rx electrodes (RxA(196d), not shown) having a straight bar shape extending in the y-axis direction above the insulating layer 192 are disposed at both side ends of the display area AA. Are provided in the 0th and m+1th Rx electrodes (RxA(196d), not shown) at a predetermined interval, and are spaced apart from the 0th and m+1th Rx electrodes (RxA(196d), not shown) A first portion 196a parallel to the first portion 196a and second and third portions 196b (not shown) bent at both ends of the first portion 196a and extending in the x-axis direction respectively To m Rx electrodes Rx1 and Rx2 (not shown) are provided.

At this time, the second and third portions 196b (not shown) of each of the first and m-th Rx electrodes (Rx1, Rx2, not shown) have a length smaller than the width of the spacing between the first portions 196a. It is formed so as not to contact each other adjacent Rx electrodes, and further, it is characterized in that it forms a shape to capture side ends of the first Tx electrode (Tx1) and the n-th electrode (not shown) provided under the insulating layer 192 .

In addition, on the insulating layer 192, the first Rx electrode RxA and the first portion 196a of the first Rx electrode Rx1 are disposed on the same line as the third portion (not shown). 1 auxiliary Rx electrode (not shown) is provided, and the first portion 196a between the first portion (not shown) of the m-th electrode (not shown) and the m+1 Rx electrode (not shown) A second auxiliary Rx electrode (not shown) positioned on the same line is provided.

In addition, a protective film or a counter substrate 198 is provided on the Rx electrode 196 through a protective layer 197 to form the touch screen 100 according to an exemplary embodiment of the present invention.

On the other hand, although not shown in the drawings, the touch screen 100 according to the embodiment of the present invention having the configuration of such a plurality of Tx electrodes 190 and Rx electrodes 196 is a display area AA of the insulating substrate 198 An x-direction sensing circuit (not shown) is mounted on one end of each of the Tx electrodes 190 in an outer non-display area (not shown) through a plurality of first link wires (not shown), etc. A y-direction sensing circuit (not shown) is mounted at one end of the Rx electrode 196 via a plurality of second link wires (not shown).

Hereinafter, touch recognition by a touch operation of the touch screen 100 according to an embodiment of the present invention having the above-described configuration will be briefly described with reference to FIG. 4. For convenience of explanation, the first row of the Tx electrode is defined as T1, the second row is defined as T2, and the n-th row is defined as Tn, the first column (0th Rx electrode) of the Rx electrode is R1, and the second column ( The first Rx electrode) is defined as R2, the m-th column is Rm, the (m+1)-th column is R(m+1), and the (m+2)-th column is R(m+2).

In the touch screen 100 according to an exemplary embodiment of the present invention, the first row T1 of the Tx electrode 190 is turned on, and the Rx electrode 195 is sequentially opened in the first column ( From R1) to the (m+2)th row (R(m+2)), the on-off state is achieved in the form of a pulse.

That is, the first column (R1) to the (m+2) column (R(M+2)) are turned on for a certain period of time and then turned off. The portion of the Rx electrode 196 with the first row T1 in which the change in capacitance has occurred is checked.

Thereafter, the first row (T1) of the Tx electrode is turned off and the second row (T2) is turned on, and then (m+2) from the first column (R1) of the Rx electrode again. The on-off operation is sequentially performed up to the column R(M+2), and this process is repeated up to the nth row Tn of the Tx electrode 190, thereby A location, that is, two-dimensional coordinates, is obtained, and the portion where the change in the static capacitance is generated is determined to be a touched portion, that is, a touch point, and an operation corresponding to the two-dimensional coordinates is performed.

9 is a cross-sectional view of a portion of a display area of a display device having a touch screen according to an exemplary embodiment of the present invention.

As shown, the display device 200 having the touch screen 100 according to the embodiment of the present invention is interposed between the array substrate 101 and the color filter substrate 181 and the two substrates 101 and 181 The panel 188 including the formed liquid crystal layer 175 and the Tx electrode 190 and the Rx electrode 196 provided at the lower and upper portions thereof by repositioning the insulating layer 192 on the third substrate 189 It is composed of a touch screen 100 including.

First, looking at the configuration of the array substrate 101 of the display device 200 having the touch screen 100 according to an embodiment of the present invention, a plurality of pixel regions P are crossing each other on the array substrate 101. ) Defining a plurality of gate wirings (not shown) and data wirings 130, and a gate wiring (not shown) and a data wiring defining each pixel region P in each pixel region P The semiconductor layer 120 is connected to the gate electrode 105, the gate insulating layer 110, the active layer 120a of pure amorphous silicon, and the ohmic contact layer 120b of impurity amorphous silicon, A thin film transistor Tr configured by sequentially stacking source and drain electrodes 133 and 136 spaced apart from each other is provided.

In this case, the thin film transistor may have various stacked structures other than the aforementioned stacked structure. For example, a polysilicon semiconductor layer of a thin film transistor having a polysilicon semiconductor layer, a gate insulating film, a gate electrode, and a semiconductor layer contact hole are provided.The polysilicon layer is formed through an interlayer insulating film and the semiconductor layer contact hole. A configuration of a source electrode and a drain electrode spaced apart from each other in contact with the semiconductor layer may be formed, or as another example, when an oxide semiconductor layer is provided, a gate electrode, a gate insulating film, an oxide semiconductor layer, an etch stopper, and It may have a stacked structure of a source electrode and a drain electrode that are spaced apart from each other on the etch stopper and respectively contact the oxide semiconductor layer.

In addition, a first protective layer 140 having a drain contact hole 143 exposing the drain electrode 136 of the thin film transistor Tr is provided on the entire surface of the thin film transistor Tr, and the first protection Above the layer 140, in each of the pixel regions P, a plate-shaped pixel electrode 150 connected through the drain electrode 136 of the thin film transistor Tr and the drain contact hole 143 is formed.

In addition, a second protective layer 160 is provided over the plate-shaped pixel electrode 150, and spaced apart from the second protective layer 160 at a predetermined interval corresponding to the plate-shaped pixel electrodes 150. A common electrode 170 having a plurality of first openings op1 having a bar shape may be formed.

In this case, the common electrode 170 may be formed on the entire surface of the display area AA, and in this case, a second opening op2 may be further provided corresponding to the thin film transistor Tr.

The array substrate 101 having such a configuration becomes an array substrate 101 for a fringe field switching mode liquid crystal display device, and the plurality of first openings op1 are symmetrically arranged with respect to the center of each pixel area P. Each pixel region P may be formed to have a double domain by having a bent configuration.

At this time, since the pixel electrode 150 and the common electrode 170 are formed by changing their positions, the pixel electrode 150 may be positioned above the common electrode 170. In this case, the plurality of first openings op1 ) May be provided on the pixel electrode 150.

Meanwhile, the array substrate 101 having the above-described configuration has become the array substrate 101 for a fringe field switching mode liquid crystal display device, but such an array substrate 101 can be variously modified.

For example, when the array substrate 101 forms an array substrate for a transverse electric field mode liquid crystal display device, the pixel electrodes 150 formed in each pixel region P are formed in a bar shape rather than a plate shape, and are spaced at a predetermined interval. A plurality of bar-shaped pixel electrodes (not shown) are formed, and a plurality of bar-shaped common electrodes (not shown) are alternately formed at regular intervals in parallel with the plurality of bar-shaped pixel electrodes (not shown). In this case, the plurality of bar-shaped common electrodes (not shown) are in contact with a common wiring (not shown) formed parallel to the gate wiring through the common contact hole (not shown).

In this case, the bar-shaped common electrode (not shown) and the pixel electrode (not shown) are symmetrically bent with respect to the center of each pixel area P, so that each pixel area P The upper and lower portions may form a double domain region. The reason why the pixel area P forms a double domain area is to suppress a color difference due to a change in the viewing angle of the display area AA, thereby improving display quality.

As another example, the array substrate 101 may form an array substrate (not shown) for a twisted nematic mode liquid crystal display, in this case, the second protective layer 160 and a plurality of first and second openings The common electrode 170 having (op1, op2) is omitted.

The inner surface of the color filter substrate 181 positioned corresponding to the array substrate 101 having various configurations according to these various embodiments is black in correspondence with the boundary of each pixel region P and each of the thin film transistors Tr. A matrix 183 is provided.

In addition, a color filter layer 186 in which red, green, and blue color filter patterns 186a, 186b, and 186c are sequentially repeated is formed in correspondence with each pixel area P surrounded by the black matrix 183.

In addition, an overcoat layer 187 is formed on the color filter layer 186 to cover the color filter layer 186 and have a flat surface. In this case, when the array substrate 101 is an array substrate for a twist nematic mode liquid crystal display (not shown), a transparent common electrode (not shown) is substituted for the overcoat layer 187 provided on the color filter substrate 181. Poem) is formed.

A liquid crystal layer 175 is provided between the array substrate 101 and the color filter substrate 181 having such a configuration, and the liquid crystal layer 175 covers the display area AA formed of the plurality of pixel areas P. ) To prevent leakage and to achieve a state in which the array substrate 101 and the color filter substrate 181 are bonded together, a seal pattern (not shown) is provided to form the panel 188 state.

At this time, although not shown in the drawing, the liquid crystal layer 175 between the array substrate 101 and the color filter substrate 181 is at the boundary of the pixel area P to maintain a constant thickness over the entire display area AA. A plurality of patterned spacers (not shown) in the form of pillars in contact with the array substrate 101 and the color filter substrate 181 at the same time are provided at predetermined intervals.

In response to the panel 188 having such a configuration, the touch screen 100 having the above-described configuration is provided on the outer surface of the color filter substrate 181, thereby providing the touch screen 100 according to the embodiment of the present invention. The liquid crystal display device 200 is being completed.

In the case of the display device 200 including the touch screen 100 according to the exemplary embodiment of the present invention, it is characterized in that it has a more excellent touch function by improving the touch performance of the touch screen 100.

Meanwhile, in the drawings, a liquid crystal display device including a panel having a liquid crystal layer in addition to a touch screen is shown as an example, but when the touch screen is applied to an organic electroluminescent device, an organic electroluminescent display with a touch screen When the touch screen is applied to a plasma display panel, a plasma display device having a touch screen is formed.

The present invention is not limited to the above embodiments, and various modifications may be made without departing from the scope of the present invention.

100: touch screen
190: Tx electrode
196: Rx electrode
196a, 196b, 196c: 1st, 2nd, 3rd part (of 1st to m Rx electrodes)
196d: leftmost Rx electrode (RxA)
196e: rightmost Rx electrode (RxB)
196f, 196g: first and second Rx auxiliary electrodes
AA: display area
R1 to R(m+2): first to (m+2) rows (of the Rx electrode)
Rx1 to Rxm: first to mth Rx electrodes
T1 to Tn: 1st to nth rows (of the Tx electrode)
Tx1 to Txn: 1st to nth Tx electrodes

Claims (15)

A plurality of Tx electrodes extending in a first direction on the display area on a first substrate in which a display area is defined and spaced apart from each other in a second direction perpendicular to the first direction;
An insulating layer formed over the plurality of Tx electrodes and over the entire display area of the first substrate;
First and second bar type Rx electrodes in the form of straight bars extending in the second direction above the insulating layer and provided at the leftmost and rightmost sides of the display area, respectively, and the first and second bar types It is positioned between the Rx electrodes and is formed at a predetermined interval, and is bent in a direction of the first bar type Rx electrode at one end of the first and second bar-type Rx electrodes parallel to the first and second bar-type Rx electrodes. A plurality of central portion Rx electrodes comprising a second portion formed in parallel with the Tx electrode and a third portion bent in the direction of the second bar type Rx electrode at the other end of the first portion and formed in parallel with the plurality of Tx electrodes;
A first auxiliary Rx electrode positioned on a line in parallel with the third portion between the first bar-type Rx electrode in the display area and the central portion Rx electrode closest thereto;
A second auxiliary Rx electrode positioned on a line in parallel with the second portion between the second bar-type Rx electrode of the display area and the center Rx electrode closest thereto
Touch screen comprising a.
The method of claim 1,
The touch screen, characterized in that both ends of the plurality of Tx electrodes are positioned between the first and second bar-type Rx electrodes.
The method of claim 1,
Each second part of the central Rx electrode is bent to the left based on each first part connected thereto, and each third part of the central Rx electrode is bent to the right based on each first part connected thereto. touch screen.
delete The method of claim 3,
Each of the plurality of second portions and the second auxiliary Rx electrode is positioned outside the Tx electrode provided at the uppermost side in the display area, and the plurality of third portions and the first auxiliary Rx electrode are disposed in the display area A touch screen characterized in that it is located on the outside of the Tx electrode provided at the bottom of the inside.
The method of claim 1,
Each second part of the central Rx electrode is bent to the right based on each first part connected thereto, and each third part of the central Rx electrode is bent to the left based on each first part connected thereto. touch screen.
delete The method of claim 6,
Each of the plurality of second portions and the second auxiliary Rx electrode is located outside the Tx electrode provided at the lowermost side in the display area, and the plurality of third portions and the first auxiliary Rx electrode are disposed in the display area A touch screen characterized in that it is located on the outside of the Tx electrode provided at the top of the inside.
The method of claim 1,
A touch screen including a protective layer formed over the first and second bar-type Rx electrodes and a plurality of central Rx electrodes.
The touch screen according to any one of claims 1 to 3, 5, 6, 8, and 9;
Display element provided under the touch screen
Display device comprising a.
The method of claim 10,
The display device, wherein the display device is any one of a liquid crystal panel, an organic light emitting device, and a plasma display device.
The method of claim 11,
The liquid crystal panel,
A second substrate on which a plurality of pixel regions are defined;
A pixel electrode provided for each pixel area on the second substrate;
A third substrate facing the second substrate;
Color filter layer provided on the inner surface of the third substrate
A display device characterized by including a.
The method of claim 12,
A common electrode is provided on the color filter layer of the third substrate, or
Or a common electrode having a plurality of bar-shaped first openings corresponding to each pixel region through a second insulating layer on the pixel electrode of the second substrate.
The method of claim 12,
A display device characterized in that a plurality of pixel electrodes are provided in a bar shape in each pixel region, and a plurality of common electrodes alternately with the pixel electrodes and having a bar shape are provided on the second substrate. The method of claim 1,
The touch screen characterized in that the first portion has a straight line shape without a bent portion.

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