TW201516771A - Touch-sensitive electrode structure and touch display device - Google Patents

Abstract

The present invention relates to a touch-sensitive electrode structure and a touch display device using the touch-sensitive electrode structure. The touch touch-sensitive structure includes a plurality of sensitive electrode units extending along a first direction and arranged along a second direction. The first direction is perpendicular to the second direction. Each of the sensitive electrode units includes a first sensitive electrode, a second sensitive electrode and a third sensitive electrode, which are dielectrical to each other. A width of the first sensitive electrode on the second direction is gradually decreased along the first direction, and a width of the second sensitive electrode on the second direction is gradually increased along the first direction. The third sensitive electrode is located between the first sensitive electrode and the second sensitive electrode, and both the first sense electrode and the second sense electrode are non-symmetrically arranged with the third sensitive electrode either on the first direction or on the second direction.

Description

Touch sensing electrode structure and touch display device

The invention relates to a touch sensing electrode structure and a touch display device having the same.

With the continuous innovation of technology, touch panels have been widely used in a wide variety of electronic devices. The touch panel can not only save the settings of the buttons, but also increase the display of the display device. The current principle of the capacitive touch panel is to apply a transparent conductive film to the glass substrate as the sensing structure. When the user touches the panel with a finger, the proximity and touch of the finger may cause the capacitance of the sensing electrode itself and the coupling capacitance to change, and the position of the finger touch is determined according to the change of the capacitance of the sensing electrode structure. The accuracy of the touch electrode determination of the touch position has always been an important issue in the field. Therefore, how to improve the capacitance change of the touch sensing electrode when receiving the touch operation at different positions is more important as the current solution. technical problem.

In view of this, there is provided a touch sensing electrode structure in which a change in capacitance is more remarkable when a touch operation at a different position is received.

Further, a touch display device having the above-described touch sensing electrode structure is provided.

A touch sensing electrode structure includes a plurality of sensing electrode units extending in a first direction, the plurality of sensing electrode units are arranged in a second direction, the first direction is perpendicular to the second direction, and each sensing electrode unit comprises a first sensing electrode and a second sensing electrode, the first sensing electrode being electrically separated from the second sensing electrode, the first sensing electrode having a first end and a second end, the second sensing electrode Having a third end and a fourth end, wherein the first end is adjacent to and opposite to the third end, the second end is adjacent to and opposite to the fourth end, and the first sensing electrode is in the second The width in the direction gradually decreases from the first end to the second end, and the width of the second sensing electrode in the second direction gradually increases from the third end to the fourth end, and the sensing electrode unit further includes a first a third sensing electrode is disposed between the second end of the first sensing electrode and the third end of the second sensing electrode, the third sensing electrode and the first sensing The measuring electrode is asymmetrical in the first direction and the second direction, and at the same time, the third sensing electrode and the second Sensing electrodes are asymmetric in the first direction and the second direction.

A touch display device has the above-described touch sensing electrode structure and a display module for displaying an image.

Compared with the prior art, each of the sensing electrodes in the touch sensing electrode structure includes at least one curved edge, so that each sensing electrode receives a touch operation at a different position along a direction extending in the length thereof. The change in capacitance is more pronounced and the linearity is higher to accurately determine the position of the touch operation.

1 is a schematic plan view showing a first embodiment of a touch sensing electrode structure.

FIG. 2 is a schematic diagram of a pair of sensing electrode units as shown in FIG. 1 when receiving a touch.

3 to 4 are schematic plan views showing a modified embodiment of the touch sensing electrode structure.

FIG. 5 is a schematic structural view of a display device having a touch sensing electrode structure as shown in FIG. 1. FIG.

Please refer to FIG. 1 , which is a schematic plan view of the touch sensing electrode structure 10 . The touch sensing electrode structure 10 includes a plurality of sensing electrode units 11 which are formed to extend in a first direction (X-axis direction) and are arranged adjacently in the second direction (Y-axis direction). Wherein, the first direction and the second direction are perpendicular to each other in the same plane. In the present embodiment, the sensing electrode unit 11 has a substantially rectangular shape.

Each of the sensing electrode units 11 includes an adjacent first sensing electrode 111, a second sensing electrode 112, a third sensing electrode 113, and a fourth sensing electrode 114. The four sensing electrodes are electrically connected to each other. Separated, and each of the sensing electrode units 11 is spaced apart from the same surface in the second direction.

In this embodiment, the first sensing electrode 111 has a first end A, a second end B, a first side a parallel to the first direction, a second side b parallel to the second direction, and the first side a and the third side c of the second side b is inclined. The first side a extends from the first end A in the first direction to the second end B. The second side b is formed to extend in the second direction at the first end A. The width of the first sensing electrode 111 in the second direction gradually decreases from the first end A to the second end B in the first direction.

The second sensing electrode 112 has a third end C, a fourth end D, a fourth side d parallel to the first direction, a fifth side e parallel to the second direction, and a third side d and a fourth side e The sixth side of the tilt setting f.

Wherein, the third end C is adjacent to and opposite to the first end A, and is located on a same line parallel to the first direction; the fourth end D is adjacent to and opposite to the second end B, and is also located parallel to the first The direction is on the same line. The length of the fourth side d is equal to the length of the first side a, and the length of the second side b is parallel from the third end C to the fourth end D; the length of the fifth side d is equal to the length of the second side b, and The length of the second side b is spaced from the fourth end D to the second end B. The first side a, the second side b, the fourth side d, and the fifth side e constitute four rectangular sides of the sensing electrode unit 11.

The width of the second sensing electrode 112 in the second direction gradually increases from the third end C to the fourth end D in the first direction.

The third sensing electrode 113 is interposed between the second end B of the first sensing electrode 111 and the third end C of the second sensing electrode 112, and includes a seventh edge g and an eighth edge i. The third sensing electrode 113 is adjacent to the first sensing electrode 111 and is divided by the dividing area of the first curve Y1. The edge on both sides of the first curve Y1 dividing area is the third of the first sensing electrode 111. The side c and the seventh side g of the third sensing electrode 113 each have a shape of the first curve Y1. The eighth side i of the third sensing electrode 113 is a straight line between the second end B and the third end C, and the eighth side i and the seventh side g are combined to form a third pattern of the closed pattern. Electrode 113.

The first sensing electrode 111 and the second sensing electrode 112 are themselves asymmetric structures, and the two sensing electrodes are also asymmetric in the first direction and the second direction.

The third sensing electrode 113 itself has an asymmetrical structure, and the third sensing electrode 113 and the first sensing electrode 111 are both asymmetric in the first direction and the second direction, and the third sensing electrode 113 and the The second sensing electrode 112 is asymmetrical in both the first direction and the second direction. Further, the first sensing electrode 111 and the third sensing electrode 113 form a substantially closed right triangle, wherein the first side a and the second side b of the first sensing electrode 111 are right angles of the right triangle The eighth side i of the third sensing electrode 113 is a hypotenuse of the right triangle.

The first curve Y1 extends from the third end C in the first direction and in a second direction toward the first side a, and the slope of the first curve Y1 gradually decreases.

Specifically, the first curve Y1 can be expressed by the calculation formula (1).

Y ₁ =X ² +aX (1)

Here, X represents a coordinate of any point on the first curve Y ₁ in the first direction (X-axis direction), Y represents a coordinate of the point in the second direction (Y-axis direction), and a represents a known coefficient.

The fourth sensing electrode 114 is also interposed between the second end B of the first sensing electrode 111 and the third end C of the second sensing electrode 112, and includes a ninth side j and a tenth side k . The fourth sensing electrode 114 is adjacent to the second sensing electrode 112 and the third sensing electrode 113, respectively, and the fourth sensing electrode 114 and the second sensing electrode 112 are divided by the dividing area of the second curve Y2. An edge located on both sides of the second curved Y2 partition is a sixth side f of the second sensing electrode 112 and a tenth side k of the fourth sensing electrode 114, and the sixth side f and the tenth side k both have a first The shape of the two curve Y2. The ninth side j of the fourth sensing electrode 114 is a straight line between the second end B and the third end C, and the ninth side i and the tenth side g are combined to form a closed figure. The fourth sensing electrode 114 itself has an asymmetrical structure and is also asymmetrical between the two in the first direction and the second direction.

Further, the second sensing electrode 112 and the fourth sensing electrode 114 form a substantially closed right triangle, wherein the fourth side d and the fifth side e of the second sensing electrode 111 are right angles of the right triangle The ninth side j of the fourth sensing electrode 114 is a hypotenuse of the right triangle, and the first, second, third, and fourth sensing electrodes 111, 112, 113, and 114 are combined to form a rectangle. The sensing electrode unit 11 and the right-angled sides of the two right-angled triangles are rectangular sides of the sensing electrode unit 11.

Preferably, the first, second, third, and fourth sensing electrodes 111, 112, 113, and 114 are both asymmetric in the first direction and the second direction.

The second curve Y2 extends from the third end C in the first direction and gradually away from the fourth side d in the second direction to the second end B, and the slope of the second curve Y2 gradually increases. This second curve Y2 can be expressed by the calculation formula (2).

Y ₂ =X ² +bX (2)

Here, X represents a coordinate of any point on the second curve Y ₂ in the first direction (X-axis direction), Y represents a coordinate of the point in the second direction (Y-axis direction), and b represents a known coefficient.

It can be seen that, in the sensing electrode unit 11, each sensing electrode includes an edge of a shape of a first curve Y1 or a second curve Y2, whereby each sensing electrode receives a touch compared to a straight edge. The degree of change in the post-capacitance is increased, so that the touch position is more accurately.

Further, each sensing electrode unit 11 is electrically connected to the sensing position calculating unit 30 from the first end A, the second end B, the third end C, and the fourth end D through a plurality of lead wires 20, and the sensing position calculation is performed. The unit 30 calculates the touch position by sensing the change in capacitance on the electrode unit 11.

Specifically, the first and third sensing electrodes 111, 113 of the first sensing electrode 111 are connected to the sensing position calculating unit 30 through the lead 20 at the first end A and the third end C, respectively, and the second sensing electrode 112 The second and fourth sensing electrodes 112, 114 are connected to the sensing position calculating unit 30 through the lead wires 20 at the second end B and the fourth end D, respectively.

Please refer to FIG. 2 , which is a schematic diagram of a position when the sensing electrode unit 11 receives a plurality of touch operations. In the present embodiment, the range of the projection length h of the sensing electrode unit 11 and the sensing electrode along the Y-axis direction is 1- 10mm. One of the sensing electrode units 11 of the touch sensing electrode structure 10 simultaneously receives two touch points A1, A2.

The sensing position calculation unit 30 receives the capacitance change amounts C1, C2, C3, and C4 of the first and third sensing electrodes 111 and 113 and the fourth and second sensing electrodes 114 and 112 by the lead wires 20, respectively.

The calculation formula of the capacitance change value of each of the sensing electrodes in the sensing electrode unit 11 is: C=ε*S/d, where ε is a dielectric constant, S is an area where the sensing electrode receives the touch, and d is The distance between the sensing electrode and the conductive object that performs the touch operation is a known constant.

The capacitance change values C1, C2, C3, and C4 obtained by the first, third, fourth, and second sensing electrodes 111, 113, 114, and 112 are sensed, and S1 is obtained by calculating a formula C=ε*S/d. S2, S3, and S4, wherein S1, S2, S3, and S4 respectively indicate areas where the first, third, fourth, and second sensing electrodes 111, 113, 114, and 112 receive touch operations.

Further, the following four calculation formulas are obtained according to the area of the touch points on the four sensing electrodes:

S1+S2=[(L-x1)*h*w1]/L+[(L-x2)*h*w2]/L (3)

S2={[(L-x1) ² +a(L-X1)]hw1+[(L-x2)2+a(L-X2)]hw2}/L (4)

S3+S4 = x1*h*w1/L+x2*h*w2/L (5)

S4=[(x ₁ ² + bx ₁ )hw1+(x ₂ ² +bx ₂ )hw2]/L (6)

In the above four calculation formulas (3), (4), (5), and (6), L represents the projection length of each sensing electrode in the X-axis direction, and h represents each sensing electrode unit 11 and the sensing electrode along Y. The projection length in the axial direction, x ₁ , x ₂ represents the length of the touch point A1, A2 center position O1, O2 projected in the X-axis direction from one edge of the sensing electrode, and w1 and w2 indicate the touch point on the X-axis. Projection width.

The distances x1 and x2 of the center point of the touch points A1 and A2 from one of the edges of the sensing electrode are calculated by using the above four (3), (4), (5), and (6) calculation formulas. Thereby, the positions of the touched points A1, A2 in the X-axis direction are obtained.

It should be noted that the area of the touch points A1 and A2 on the four sensing electrodes is calculated by the area of the parallelogram.

Further, by analyzing the position of the lead receiving the change in capacitance, that is, the position of the sensing electrode whose capacitance value is changed, the position of the touch points A1, A2 in the Y-axis direction can be obtained.

Preferably, the maximum value of the projection length h of the sensing electrode unit 11 and the four sensing electrodes in the Y-axis direction is smaller than the projection length of the touch point in the Y-axis direction.

For example, FIG. 3 or FIG. 4 is a schematic plan view showing two modified embodiments of the touch sensing electrode structure according to the present invention. The structures of the touch panels 10 ^' and 10 ^'' are basically the same as those of the first embodiment. The difference is only that, as shown in FIG. 3, the sensing electrode unit 11 may also include only the first sensing electrode 111 and the third sensing electrode 113 divided by the first band Y1, and the second sensing electrode. 112 is integral with the fourth sensing electrode 114 and is not divided by the dividing band of the second curve Y2; or as shown in FIG. 4, the sensing electrode unit 11 includes only the dividing band divided by the second curve Y1. The sensing electrode 112 and the fourth sensing electrode 114 are combined, and the third sensing electrode 113 and the first sensing electrode 111 are combined as a whole, and are not divided by the dividing band of the first curve Y1.

The shape of the sensing electrode unit 11 may also be a parallelogram. One of the right and left sides of the first sensing electrode 111 and the second sensing electrode 112 forms a parallelogram of the sensing electrode unit. 1. One of the right sensing edges of the second sensing electrodes 111, 112 is adjacent and oppositely disposed.

Compared with the prior art, the sensing electrode unit 11 includes at least three sensing electrodes whose shapes are asymmetrical in the first direction and the second direction, and the sensing electrode unit 11 has a plurality of sensing points in the length extending direction. At the same time, different capacitance changes can be generated correspondingly, thereby identifying the position of the complex touch point.

Please refer to FIG. 5 , which is a structural diagram of a touch display device having a touch sensing electrode structure as shown in FIG. 1 . The touch display device 40 includes a touch module 50 and a display having a touch sensing electrode structure 10 . The module 60 can be understood that the touch sensing electrode structure 10 is disposed on a transparent substrate (not labeled), and the display module 60 is used to display an image. In this embodiment, the display module 60 can adopt a liquid crystal. Display module to achieve. The touch sensing electrode structure 10 is disposed on one side of the display module 60 to implement touch position detection and image display.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be able to include the equivalent modifications or variations in the spirit of the present invention.

10, 10 ^' , 10 ^{' '} ‧ ‧ touch sensing electrode structure

11‧‧‧Sensor electrode unit

111‧‧‧First sensing electrode

112‧‧‧Second sensing electrode

113‧‧‧ Third sensing electrode

114‧‧‧fourth sensing electrode

20‧‧‧ lead

30‧‧‧Sensing position calculation unit

40‧‧‧Touch display device

50‧‧‧Touch Module

60‧‧‧ display module

A‧‧‧ first side

B‧‧‧ second side

C‧‧‧ third side

D‧‧‧ fourth side

E‧‧‧ fifth side

F‧‧‧ sixth side

G‧‧‧ seventh side

I‧‧‧ eighth side

J‧‧‧ ninth side

K‧‧‧10th side

A‧‧‧ first end

B‧‧‧ second end

C‧‧‧ third end

D‧‧‧ fourth end

Y1‧‧‧ first curve

Y2‧‧‧ second curve

A1, A2‧‧‧ touch points

Center position of Q1, Q2‧‧‧ touch points

no

10‧‧‧Touch sensing electrode structure

11‧‧‧Sensor electrode unit

111‧‧‧First sensing electrode

112‧‧‧Second sensing electrode

113‧‧‧ Third sensing electrode

114‧‧‧fourth sensing electrode

20‧‧‧ lead

30‧‧‧Sensing position calculation unit

A‧‧‧ first side

B‧‧‧ second side

C‧‧‧ third side

D‧‧‧ fourth side

E‧‧‧ fifth side

F‧‧‧ sixth side

G‧‧‧ seventh side

I‧‧‧ eighth side

J‧‧‧ ninth side

K‧‧‧10th side

A‧‧‧ first end

B‧‧‧ second end

C‧‧‧ third end

D‧‧‧ fourth end

Y1‧‧‧ first curve

Y2‧‧‧ second curve

Claims (10)

A touch sensing electrode structure includes a plurality of sensing electrode units extending in a first direction, the plurality of sensing electrode units are arranged in a second direction, the first direction is perpendicular to the second direction, and each sensing electrode unit comprises a first sensing electrode and a second sensing electrode, the first sensing electrode being electrically separated from the second sensing electrode, the first sensing electrode having a first end and a second end, the second sensing electrode Having a third end and a fourth end, wherein the first end is adjacent to and opposite to the third end, the second end is adjacent to and opposite to the fourth end, and the first sensing electrode is in the second The width in the direction gradually decreases from the first end to the second end, and the width of the second sensing electrode in the second direction gradually increases from the third end to the fourth end, wherein the sensing electrode unit further includes a third sensing electrode is disposed between the second end of the first sensing electrode and the third end of the second sensing electrode, the third sensing electrode and the third a sensing electrode is asymmetric in both the first direction and the second direction, and at the same time, the third sensing electrode Second sensing electrodes are asymmetric in the first direction and the second direction. The touch sensing electrode structure of claim 1, wherein the first sensing electrode and the third sensing electrode pass a first curved shape dividing strip between the second end and the third end Segmentation is performed, and the first sensing electrode is adjacent to the third sensing electrode and the opposite edge is in a first curved shape. The touch sensing electrode structure of claim 2, wherein the first sensing electrode has a first side parallel to the first direction and a second side parallel to the second direction, the first side One end extends to the second end, the second side extends from the first end to the third end, the second sensing electrode has a third side parallel to the first direction and a fourth side parallel to the second direction a third side extending from the third end to the fourth end, the fourth side extending from the second end to the fourth end, the first side being equal in length to the third side, the second side Equal to the length of the fourth side, the first curve extends from the third end in a first direction and a tendency to gradually approach the first side in the second direction to the second end, the slope of the first curve slowing shrieking. The touch sensing electrode structure of claim 3, wherein the sensing electrode unit further includes a fourth sensing electrode, the fourth sensing electrode is located at the second end of the first sensing electrode Between the third ends of the second sensing electrodes, and in the first direction and the second direction, the third sensing electrodes are asymmetric, and the fourth sensing electrodes and the second sensing electrodes pass through one The dividing portion of the second curved shape is divided between the second end and the third end, and the second sensing electrode is adjacent to the fourth sensing electrode and the opposite edge is in a second curved shape. The touch sensing electrode structure of claim 4, wherein the third sensing electrode is disposed adjacent to the fourth sensing electrode, and the third sensing electrode is adjacent to and opposite to the fourth sensing electrode The edge is a linear shape, and the third sensing electrode is symmetric with the center of the fourth sensing electrode. The touch sensing electrode structure of claim 4, wherein the second curve extends from the third end in a first direction and in a second direction gradually away from the third side to the second end, And the slope of the second curve gradually increases. The touch sensing electrode structure of claim 4, wherein the sensing electrode unit has a rectangular shape, and the first sensing electrode and the third sensing electrode form a right-angled triangle shape, and the fourth sensing The electrode and the second sensing electrode form a right-angled triangle shape, and the first, second, third, and fourth sides of the first sensing electrode and the second sensing electrode constitute the sensing electrode unit Rectangular edge. The touch sensing electrode structure of claim 4, wherein the sensing electrode unit has a projection width in the second direction ranging from 1 to 10 mm. The touch sensing electrode structure of claim 4, wherein the first sensing electrode and the third sensing electrode are respectively connected to a sensing position calculating unit by the lead at the first end and the third end. The second sensing electrode and the fourth sensing electrode are respectively connected to the sensing position calculating unit by wires at the second end and the fourth end, and the sensing position calculating unit is configured according to the first and second The change in the capacitance value on the third and fourth sensing electrodes calculates the position of the touch operation in the first direction. A touch display device, comprising the touch sensing electrode structure according to any one of claims 1-9, and a display module for displaying an image.