CN104731419B - Sensing electrode structure - Google Patents

Abstract

The present invention provides a sensing electrode structure formed on a substrate of a touch device, which includes: a first sensing electrode row; a second sensing electrode row parallel to the first sensing electrode row, the second sensing electrode row including a plurality of second sensing electrode units; and a guard ring surrounding the second sensing electrode row, the guard ring including a plurality of guard electrodes arranged between the plurality of second sensing electrode units.

Description

Sensing Electrode Structure

technical field

The present invention relates to a sensing electrode structure, in particular to a sensing electrode structure with a special guard ring design.

Background technique

Touch panel is a huge industry, and all kinds of electronic products use touch panel as an important input and output device of human-machine interface. The performance of the touch panel depends on the sensing electrodes and the logic circuit connected to the sensing electrodes. The design and quality of the sensing electrodes will affect the performance of the touch panel.

Generally, the sensing electrodes of the touch panel are formed on a transparent substrate. The light emitted by the display device can be displayed to the user through the transparent substrate. The sensing electrodes formed on the transparent substrate include a plurality of electrodes, and the electrodes are connected to a logic circuit through a plurality of wires.

In particular, the design of modern electronic products is becoming thinner and smaller, and the thickness of the touch panel determines the thickness of the touch screen. In addition, multi-touch has also become an important factor in the human-machine interface. Therefore, the projected capacitive touch panel that can support single-layer multi-point is currently one of the few touch panel types that can meet the above requirements.

As the resolution of the display device is continuously improved, the user's requirements for the performance of the touch panel are also increased. The touch performance of the touch device, such as resolution, accuracy, and sensing speed for fast-moving objects, all require more electrodes and wires to be squeezed into the limited area of the touch area.

Due to the limitations of the wiring, the distances between the electrodes are not equal. When calculating touch coordinates, nonlinear factors may cause errors. Accordingly, there is a need for a new sensing electrode structure that can reduce the unequal distances between the electrodes, thereby making the mutual capacitance between the electrodes approach the same value, and reducing the nonlinear factors in coordinate calculation .

Contents of the invention

In one embodiment of the present invention, a sensing electrode structure formed on a substrate of a touch device is provided, which includes: a first sensing electrode row; a second sensing electrode row parallel to the first sensing electrode row Sensing electrode row, the second sensing electrode row includes a plurality of second sensing electrode units; and a guard ring surrounding the second sensing electrode row, the guard ring includes a plurality of second sensing electrode units Multiple guard electrodes between cells.

The main spirit of the present invention is to extend the guard ring circuit between the second sensing electrode units of the second sensing electrode row, so that the mutual capacitance effect of the second sensing electrode row is approximately equal to the first sensing electrode row of the inserted wire , thereby reducing the degree of non-linearity and improving the accuracy of touch sensing.

Description of drawings

FIG. 1A is a schematic diagram of a sensing electrode structure according to an embodiment of the present invention.

FIG. 1B is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

FIG. 2 is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a sensing electrode structure according to another embodiment of the present invention.

detailed description

The present invention will be described in detail in some embodiments as follows. However, except for the disclosed embodiments, the scope of the present invention is not limited by these embodiments, and the scope of the subsequent patent applications shall prevail. In order to provide a clearer description and enable ordinary people in the art to understand the content of the present invention, the various parts in the illustrations are not drawn according to their relative sizes, and the proportions of certain dimensions or other relative dimensions may be highlighted It appears exaggerated, and irrelevant details are not fully drawn in order to simplify the diagram.

Please refer to FIG. 1A , which is a schematic diagram of a sensing electrode structure 100 according to an embodiment of the present invention. The sensing electrode structure 100 can be formed on a substrate of a touch device. The touch device can be a part of the touch panel or a part of the touch screen. The substrate can be opaque or transparent. In some embodiments, the touch device may be an in-cell touch screen. In other embodiments, the touch device may be an On-Cell touch screen.

The sensing electrode structure 100 includes a first sensing electrode row 110 , a second sensing electrode row 120 parallel to the first sensing electrode row 110 , and a guard ring surrounding the second sensing electrode row 120 130. In the embodiment shown in FIG. 1A , the guard ring 130 also surrounds part of the first sensing electrode row 110 .

The first sensing electrode row 110 includes a plurality of first sensing electrode units arranged in a row, and each first sensing electrode unit includes a first electrode 111, a second electrode 112, and an electrode connected to the first electrode 111. The first wire 113 and a second wire 114 connected to the second electrode 112 . The above-mentioned first electrode 111 is opposite to the second electrode 112 . In some embodiments, the first electrode 111 includes a triangular-like electrode. The triangular-like referred to here may include triangles, trapezoids, and polygons. Those skilled in the art can understand that the present invention does not limit the shapes of the first electrode 111 and the second electrode 112 , only that the first electrode 111 is relative to the second electrode 112 .

Similarly, the second sensing electrode row 120 parallel to the first sensing electrode row 110 includes a plurality of second sensing electrode units arranged in a row, and each second sensing electrode unit includes a third electrode 121, A fourth electrode 122 , a third wire 123 connected to the third electrode 121 , and a fourth wire 124 connected to the fourth electrode 122 . The aforementioned third electrode 121 is opposite to the fourth electrode 122 . In some embodiments, the third electrode 121 includes a triangular-like electrode. The triangular-like referred to here may include triangles, trapezoids, and polygons. Those skilled in the art can understand that the present invention does not limit the shapes of the third electrode 121 and the fourth electrode 122 , only that the third electrode 121 is relative to the fourth electrode 122 .

The first sensing electrode unit corresponds to one second sensing electrode unit. The third wire 123 and the fourth wire 124 included in the second sensing electrode unit extend from the side to the top of the corresponding first sensing electrode unit. In other words, in the upper first sensing electrode row 110 , the first electrode 111 and/or the second electrode 112 of the first sensing electrode unit is adjacent to the third wire 123 and/or the fourth wire 124 . However, since the third wire 123 and the fourth wire 124 extend upward, in the lower second sensing electrode row 120 , the third electrode 121 and/or the fourth electrode 122 will not be adjacent to other wires. This configuration creates some additional mutual capacitance effects. When an external conductive object approaches or touches the region of the first sensing electrode row 110 located above, the first electrode 111 and/or the second electrode 112 will interact with the third wire 123 and/or the fourth wire 124. Capacitance values will vary. In other words, the controller of the touch device considers that the mutual capacitance value of the third wire 123 and the fourth wire 123 connected to the third electrode 121 and the fourth electrode 122 has changed. As mentioned above, when an external conductive object approaches or touches the first sensing electrode row 110 and the second sensing electrode row 120 , the capacitive effect will be different, thereby generating a nonlinear effect.

Therefore, the present invention places a plurality of guard electrodes 140 between the plurality of second sensing electrode units of the second sensing electrode row 120 . That is, a plurality of guard electrodes 140A, 140B, 140C, etc. connected to guard ring 130 in FIG. 1A . When an external conductive object approaches or touches the area of the second sensing electrode row 120, it will affect the third electrode 121 and/or the fourth electrode 122 adjacent to the guard electrode 140, causing the first sensing electrode located above Row 110 has a similar mutual capacitance effect. The effect will enable the controller of the touch device to better eliminate the wiring asymmetry between the first sensing electrode row 110 and the second sensing electrode row 120 , and reduce nonlinear calculation results.

Please refer to FIG. 1B , which is a schematic diagram of a sensing electrode structure 100 according to another embodiment of the present invention. Compared with FIG. 1A , the difference of the embodiment shown in FIG. 1B is that there is a gap 132 in the middle of the guard ring 130 shown in FIG. 1B , so that the guard ring is divided into a first guard ring 130A and a second guard ring 130B. Each of the aforementioned guard electrodes 140 is connected to a first guard ring 130A or a second guard ring 130B. The present invention does not limit the position of the notch 132 . In some embodiments, the plurality of guard electrodes 140 will all be connected to the first guard ring 130A. In other embodiments, the plurality of guard electrodes 140 will all be connected to the second guard ring 130B. In further embodiments, a portion of the plurality of guard electrodes 140 is connected to the first guard ring 130A, and the remaining portion is connected to the second guard ring 130B.

Please refer to FIG. 2 , which is a schematic diagram of a sensing electrode structure 200 according to another embodiment of the present invention. Compared with FIG. 1A, the difference of the embodiment shown in FIG. 2 is that the electrode shape of the first sensing electrode unit shown in FIG. Mirror, the axis of the mirror is approximately the separation line between the first sensing electrode row 110 and the second sensing electrode row 120 .

In the embodiment shown in FIG. 2 , the electrode shape of the first electrode 211 corresponds to the fourth electrode 122 , and the electrode shape of the second electrode 212 corresponds to the third electrode 121 . In another embodiment, the electrode shape of the first electrode 211 may correspond to the third electrode 121 , and the electrode shape of the second electrode 212 may correspond to the fourth electrode 122 . That is to say, the present invention does not limit which electrode corresponds to which electrode, only that the electrode shape of the first sensing electrode unit corresponds to the electrode shape of the second sensing electrode unit. For example, the electrode shape of the first electrode 211 may be mapped to the third electrode 121 or the fourth electrode 122 , and the electrode shape of the second electrode 212 may be mapped to the fourth electrode 122 or the third electrode 121 . From another point of view, the electrode shape of the first sensing electrode unit is exactly the electrode shape of the second sensing electrode unit flipped along the central axis. Conversely, the electrode shape of the second sensing electrode unit is also the electrode shape of the first sensing electrode unit flipped along the central axis.

Please refer to FIG. 3 , which is a schematic diagram of a sensing electrode structure 300 according to another embodiment of the present invention. Compared with FIG. 1A , the difference of the embodiment shown in FIG. 3 is that each of the first electrode 311 , the second electrode 312 , the third electrode 321 , and the fourth electrode 322 shown in FIG. 3 includes two quasi-triangular shapes. In another embodiment, each electrode of the first sensing electrode unit and the second sensing electrode unit may include a plurality of triangular-like electrodes. However, the plurality of guard electrodes 140 are still located between the two second sensing electrode units.

Please refer to FIG. 4 , which is a schematic diagram of a sensing electrode structure 400 according to another embodiment of the present invention. The embodiment shown in Fig. 4 is exactly the same as that of Fig. 1A, and Fig. 4 is used to illustrate the relationship of dimensions. In this embodiment, the distance between the first electrode 121 and the third wire 123 is set as d1, and the distance between the second electrode 122 and the fourth wire 124 is also d1. The distance between the adjacent third wires 123 and the fourth wires 124 is assumed to be d2.

In the embodiment shown in FIG. 4 , the distance between the edge of the protection electrode 140 and the third electrode 121 and the fourth electrode 122 is also d1. In this way, it can be ensured that the mutual capacitance effect will be approximately the same, and the difference between the first sensing electrode row 110 and the second sensing electrode row 120 can be eliminated to the greatest extent.

In the embodiment shown in FIG. 4 , when the distance between the adjacent third wire 123 and the fourth wire 124 is assumed to be d2, the width of the corresponding guard electrode 140 can also be set to d2, so as to facilitate the design of circuit layout. In some embodiments, the distance d1 can be equal to d2. In other words, the distance between the third wire 123 and the first electrode 111 , the distance between the third electrode 121 and the nearest guard electrode 140 , and the width of the guard electrode 140 are all the same.

Please refer to FIG. 5 , which is a schematic diagram of a sensing electrode structure 500 according to another embodiment of the present invention. The upper half of the sensing electrode structure 500 is the same as the sensing electrode structure 100 shown in FIG. 1A , including a first electrode row 110 and a second electrode row 120 . The sensing electrode structure 500 further includes a third electrode row 530 and a fourth electrode row 540 . The third electrode row 530 includes a plurality of third sensing electrode units, and the fourth electrode row 540 includes a plurality of fourth sensing electrode units. Each of the third sensing electrode units corresponds to one of the fourth sensing electrode units.

In an embodiment, the structure of the third electrode row 530 may correspond to the second electrode row 120 , and the structure of the fourth electrode row 540 may correspond to the first electrode row 110 . The wires of the electrodes of the third electrode row 530 pass through the fourth electrode row 540 and come out from below. That is, the wires of the third sensing electrode unit extend from the side to the bottom of the corresponding fourth sensing electrode unit. As mentioned above, the present invention does not limit the correspondence between the electrodes in the first electrode row 110 and the second electrode row 120, so the present invention does not limit the correspondence between the electrodes in the third electrode row 530 and the fourth electrode row 540. Condition.

In the embodiment shown in FIG. 5 , the guard ring 130 is interposed between the second electrode row 120 and the third electrode row 130 and surrounds the third electrode row 130 . The guard ring 130 also surrounds a portion of the fourth sensing electrode row 540 . Just as the plurality of guard electrodes 140A, 140B, 140C go deep into each second sensing electrode unit of the second electrode row 120, the plurality of guard electrodes 140X, 140Y, 140Z also go deep into each first electrode unit of the third electrode row 530. Between the three sensing electrode units. These newly added guard electrodes 140X, 140Y, 140Z are also connected to the guard ring 130 .

Please refer to FIG. 6 , which is a schematic diagram of a sensing electrode structure 600 according to another embodiment of the present invention. The upper half of the sensing electrode structure 600 is identical to the sensing electrode structure 100 shown in FIG. 1A . The lower half of the sensing electrode structure 600 is exactly the same as the sensing electrode structure 100 shown in FIG. 1A , but the direction is reversed. Compared with the sensing electrode structure 500 shown in FIG. 5 , the sensing electrode structure 600 shown in FIG. 6 has a second guard ring 630 surrounding the third sensing electrode row. Since the guard ring 130 is completely separated from the second guard ring 630 , the aforementioned plurality of guard electrodes 140X, 140Y, 140Z are instead connected to the second guard ring 630 .

Those skilled in the art can understand that the various descriptions or features in FIGS. 1A to 4 above can be applied to the embodiments shown in FIGS. 5 and 6 , so details are not described here.

As mentioned above, one of the main spirits of the present invention is to extend the guard ring circuit between the second sensing electrode units of the second sensing electrode row, so that the mutual capacitance effect of the second sensing electrode row is approximately equal to the insertion wire The first sensing electrode row reduces the degree of non-linearity and improves the accuracy of touch sensing.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention; all other equivalent changes or modifications completed under the spirit disclosed by the present invention should be included in the following scope of the patent application.

Claims (12)

1. a kind of sensing electrode structure, the substrate of contactor control device is formed at, comprising：

First sensing electrode is arranged；

Arranged parallel to the second sensing electrode of first sensing electrode row, it includes multiple second sensing electrode units；And

Around the protection ring of second sensing electrode row, the protection ring is included and is arranged between the plurality of second sensing electrode unit Multiple guard electrodes.

2. sensing electrode structure as claimed in claim 1, it is characterised in that what above-mentioned protection ring was not connected with comprising two First protection ring and the second protection ring, the plurality of guard electrode are respectively connecting to first protection ring and second protection ring wherein One of.

3. sensing electrode structure as claimed in claim 1, it is characterised in that above-mentioned first sensing electrode row includes multiple the One sensing electrode unit, each the first sensing electrode unit are corresponding to the second sensing electrode unit.

4. sensing electrode structure as claimed in claim 3, it is characterised in that the electrode shape of the first above-mentioned sensing electrode unit Shape is identical with the electrode shape of corresponding the second sensing electrode unit.

5. sensing electrode structure as claimed in claim 3, it is characterised in that the electrode shape of the first above-mentioned sensing electrode unit The mutual mapping of electrode shape of shape and corresponding the second sensing electrode unit.

6. sensing electrode structure as claimed in claim 3, it is characterised in that the first above-mentioned sensing electrode unit includes first Electrode and the second electrode for corresponding to the first electrode, the first electrode include more than one class triangular-shaped electrodes, and this second Electrode includes the class triangular-shaped electrodes relative with the class triangular-shaped electrodes of the first electrode, wherein the second above-mentioned sensing electrode list Member includes the 3rd electrode and the 4th electrode for corresponding to the 3rd electrode, and the 3rd electrode includes more than one class triangle electricity Pole, the 4th electrode include the class triangular-shaped electrodes relative with the class delta network of the 3rd electrode.

7. sensing electrode structure as claimed in claim 6, it is characterised in that the second above-mentioned sensing electrode unit further includes company Be connected to the privates of the 3rd electrode, the distance of the privates and the first electrode and the 3rd electrode with it is closest The distance of the guard electrode is substantially equal.

8. sensing electrode structure as claimed in claim 6, it is characterised in that the second above-mentioned sensing electrode unit further includes company It is connected to the privates of its 3rd electrode included, adjacent the second sensing electrode unit, which further includes, to be connected to it and wrapped The privates of the 4th electrode contained, the distance of the privates and the privates with apart from the 3rd electrode it is nearest should The width of guard electrode is substantially equal.

9. sensing electrode structure as claimed in claim 6, it is characterised in that the second above-mentioned sensing electrode unit further includes company It is connected to the privates of its 3rd electrode included, adjacent the second sensing electrode unit, which further includes, to be connected to it and wrapped The privates of the 4th electrode contained, following three distance essence are equal：

The privates and the distance of the first electrode；

3rd electrode and the distance of the closest guard electrode；And

The width of the guard electrode nearest apart from the 3rd electrode.

10. sensing electrode structure as claimed in claim 1, it is characterised in that the width of above-mentioned multiple guard electrodes is different In the width of the protection ring.

11. sensing electrode structure as claimed in claim 1, it is characterised in that further include：

Arranged parallel to the 3rd sensing electrode of first sensing electrode row, it includes multiple 3rd sensing electrode units；And

Arranged parallel to the 4th sensing electrode of first sensing electrode row,

Wherein above-mentioned protection ring is arranged around the 3rd sensing electrode, and the protection ring includes and is arranged in the plurality of 3rd sensing electricity Multiple guard electrodes between pole unit.

12. sensing electrode structure as claimed in claim 1, it is characterised in that further include：

Arranged parallel to the 3rd sensing electrode of first sensing electrode row, it includes multiple 3rd sensing electrode units；

Arranged parallel to the 4th sensing electrode of first sensing electrode row；And

Around the Article 2 protection ring of the 3rd sensing electrode row, and the Article 2 protection ring includes and is arranged in the plurality of 3rd sense The multiple guard electrodes surveyed between electrode unit.