CN108762555B - Touch substrate and touch device - Google Patents
Touch substrate and touch device Download PDFInfo
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- CN108762555B CN108762555B CN201810489155.4A CN201810489155A CN108762555B CN 108762555 B CN108762555 B CN 108762555B CN 201810489155 A CN201810489155 A CN 201810489155A CN 108762555 B CN108762555 B CN 108762555B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- Position Input By Displaying (AREA)
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Abstract
The invention provides a touch substrate which comprises a stretchable substrate, wherein a plurality of first electrodes and a plurality of second electrodes are arranged on the stretchable substrate, and the plurality of first electrodes are arranged in a plurality of rows and a plurality of columns; the second electrodes are arranged on two sides of each first electrode along the row direction and two sides of each first electrode along the column direction; a dielectric layer is arranged between each first electrode and the adjacent second electrode, the dielectric constant of the dielectric layer is increased when the dielectric layer is stretched and is reduced when the dielectric layer is squeezed, and the variation of the dielectric constant is positively correlated with the deformation of the dielectric layer. Correspondingly, the invention further provides a touch device. The method and the device can reduce the influence of the deformation of the touch substrate on the touch precision and improve the accuracy of touch position judgment.
Description
Technical Field
The invention relates to the technical field of touch control, in particular to a touch control substrate and a touch control device.
Background
The mutual capacitance type touch panel comprises a plurality of driving electrodes and a plurality of induction electrodes, the driving electrodes in the same row are connected with each other, the induction electrodes in the same column are connected with each other, and capacitors are formed at the adjacent positions of the driving electrode units and the induction electrode units. The driving circuit provides driving signals to the driving electrodes in each row in turn in a scanning mode, and corresponding sensing signals are generated on the sensing electrodes. When touch is performed, the capacitance at the touch position changes, so that the sensing signals of the sensing electrodes in the corresponding columns change, and the touch position is determined.
At present, the driving electrodes and the sensing electrodes are usually located in the same layer, but if the touch structure is applied to a stretchable touch device, when the touch device deforms (e.g., stretches), even though touch does not occur, the distance between some of the driving electrodes and the sensing electrodes increases, so that the capacitance value of the capacitor changes, and the driving circuit is mistakenly used for touch position determination; moreover, if the touch device is deformed for touch control, the accuracy of touch position determination is also affected.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides a touch substrate and a touch device, so as to reduce the influence of the deformation of the touch substrate on the touch precision and improve the accuracy of touch position judgment.
In order to achieve the above object, the present invention provides a touch substrate, including a stretchable substrate, on which a plurality of first electrodes and a plurality of second electrodes are disposed, the plurality of first electrodes being arranged in a plurality of rows and a plurality of columns; the second electrodes are arranged on two sides of each first electrode along the row direction and two sides of each first electrode along the column direction;
a dielectric layer is arranged between each first electrode and the adjacent second electrode, the dielectric constant of the dielectric layer is increased when the dielectric layer is stretched and is reduced when the dielectric layer is squeezed, and the variation of the dielectric constant is positively correlated with the deformation of the dielectric layer.
Preferably, the material of the dielectric layer comprises polyvinylidene fluoride.
Preferably, the stretchable substrate comprises a plurality of islands and spacers separating the plurality of islands from each other, the islands having a modulus of elasticity greater than the modulus of elasticity of the spacers;
at least a part of the first electrodes and/or at least a part of the second electrodes are arranged on the islands, and each island is provided with one first electrode or one second electrode; a dielectric layer between the first electrode and the second electrode is located at the spacer.
Preferably, each first electrode and each second electrode are disposed on the island portion.
Preferably, at least two second electrodes are arranged between every two adjacent first electrodes in the same row and between every two adjacent first electrodes in the same column,
when the stretchable substrate is not deformed, the distance between the first electrode and each of the second electrodes is the same among the plurality of second electrodes adjacent to any one of the first electrodes.
Preferably, for any one first electrode and a plurality of second electrodes adjacent to the first electrode, the edge of each second electrode facing the first electrode is an arc-shaped edge; and when the stretchable substrate is not stretched, the arc-shaped edges of the plurality of second electrodes correspond to the same circle center, and the position of the orthographic projection of the circle center on the stretchable substrate is the same as the position of the orthographic projection of the center of the first electrode on the stretchable substrate.
Preferably, an orthographic projection of the first electrode on the stretchable substrate is circular or a regular polygon.
Preferably, the first electrode is a driving electrode, and the second electrode is an induction electrode.
Preferably, the plurality of first electrodes in the same row are connected in sequence, and the first electrodes in different rows are insulated and spaced; or the plurality of first electrodes in the same column are connected in sequence, and the first electrodes in different columns are insulated and spaced.
Correspondingly, the invention further provides a touch device, which comprises the touch substrate and a driving circuit, wherein the driving circuit is used for providing a driving signal for one of the first electrode and the second electrode and detecting a signal sensed on the other electrode.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic connection diagram of a touch substrate and a driving circuit provided in the present invention;
FIG. 2 is a cross-sectional view taken along line AA in FIG. 1;
fig. 3a is a schematic diagram illustrating a positional relationship between any one first electrode and an adjacent second electrode when the touch substrate is not stretched;
fig. 3b is a schematic diagram illustrating a positional relationship between a first electrode in the middle of a touch substrate and an adjacent second electrode after the touch substrate is stretched left and right;
fig. 3c is a schematic diagram illustrating a positional relationship between a first electrode near the left edge of the touch substrate and an adjacent second electrode after the touch substrate is stretched left and right;
fig. 4 to 6 are schematic structural diagrams of first electrodes and second electrodes adjacent to the first electrodes in different shapes, respectively.
Wherein the reference numerals are:
10. a stretchable substrate; 11. an island portion; 12. a spacer section; 21. a first electrode; 22. a second electrode; 23. a dielectric layer; 30. a drive circuit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic diagram of a connection between a touch substrate and a driving circuit according to the present invention, and fig. 2 is a cross-sectional view taken along line AA in fig. 1. Referring to fig. 1 and 2, the touch substrate includes a stretchable substrate 10, and a plurality of first electrodes 21 and a plurality of second electrodes 22 are disposed on the stretchable substrate 10. The plurality of first electrodes 21 are arranged in a plurality of rows and columns, and the second electrodes 22 are disposed on both sides of each first electrode 21 in the row direction and both sides of each first electrode in the column direction. A dielectric layer 23 is arranged between each first electrode 21 and the adjacent second electrode 22, the dielectric constant of the dielectric layer 23 is increased when the dielectric layer 23 is stretched and is decreased when the dielectric layer 23 is compressed, and the variation of the dielectric constant is positively correlated with the deformation of the dielectric layer 23 caused by stretching or compressing.
It should be understood that the first electrode 21 is provided with the second electrodes 22 on both sides in the row direction and in the column direction, meaning that: there are no other first electrodes 21 between any first electrode 21 and the second electrodes 22 on both sides, that is, the second electrodes 22 are disposed between every two adjacent first electrodes 21 in the same row and between every two adjacent first electrodes 21 in the same column. The row direction may be a length direction of the touch substrate, and the column direction may be a width direction of the touch substrate; of course, the row and column directions may be other directions.
In the present invention, a touch capacitor may be formed between the first electrode 21 and any one of the adjacent second electrodes 22, and a capacitance Cm of the touch capacitor is ═ S/d; where ε is the dielectric constant of the dielectric layer 23 between the first electrode 21 and the second electrode 22, S is the relative area of the first electrode 21 and the second electrode 22, and d is the distance between the first electrode 21 and the second electrode 22. When the distance between the first electrode 21 and the adjacent second electrode 22 is increased due to the deformation of the stretchable substrate 10, the dielectric constant of the dielectric layer 23 between the first electrode 21 and the second electrode 22 is correspondingly increased, and the amount of increase is positively correlated with the deformation amount of the dielectric layer 23, so that the capacitance value of the touch capacitor is changed little or not changed; similarly, when the stretchable substrate 10 deforms and the distance between the first electrode 21 and the adjacent second electrode 22 decreases, the capacitance value of the touch capacitor changes little or no; therefore, when the touch substrate is deformed and no touch is generated, the occurrence of erroneous touch determination by the driving circuit 30 due to the deformation can be reduced, and when the touch substrate is deformed and touched at the same time, the influence of the deformation of the touch substrate on the touch position determination can be reduced, thereby improving the touch accuracy.
Among them, the material of the dielectric layer 23 includes polyvinylidene fluoride (PVDF), which has molecular dipole moment orientation and large polarizability when stretched, so that the dielectric constant is increased.
The touch substrate of the present invention is specifically described below with reference to fig. 1 to 3 c.
One of the first electrode 21 and the second electrode 22 is a driving electrode, and the other is a sensing electrode. Specifically, the present invention uses the first electrode 21 as a driving electrode and the second electrode 22 as a sensing electrode, and the first electrodes 21 in the same row are connected to each other, and the first electrodes 21 in different rows are insulated and spaced apart. When performing touch control, the driving circuit 30 provides driving signals to the first electrodes 21 one by one, and detects a sensing signal generated by each second electrode 22. When touch is generated, the capacitance of the touch position changes, so that the sensing signal on the second electrode 22 at the corresponding position changes, and the touch position is determined according to the position of the second electrode 22 where the sensing signal changes. Of course, the first electrodes 21 in the same column may be connected together, the first electrodes 21 in different columns are insulated and spaced, and accordingly, the driving circuit 30 provides driving signals to the first electrodes 21 column by column when performing touch control.
The first electrode 21 and the second electrode 22 may be provided in the same layer, or may be formed in two layers.
As shown in fig. 2, the stretchable substrate 10 includes a plurality of islands 11 and spacers 12 that space the plurality of islands 11 apart from each other, and the elastic modulus of the islands 11 is greater than that of the spacers 12, i.e., the islands 11 are less likely to deform than the spacers 12 when subjected to the same tensile force. At least a part of the first electrodes 21 and/or at least a part of the second electrodes 22 are disposed on the islands 11, one first electrode 21 or one second electrode 22 being disposed on each island 11; a dielectric layer 23 between the first electrode 21 and the second electrode 22 is located at the spacer 12 to ensure that at least a portion of the electrodes deform little or no when stretched. The island 11 and the spacer 12 may be located in the same layer or in different layers.
Preferably, each first electrode 21 and each second electrode 22 are disposed on the island 11, and each island 11 is disposed with one first electrode 21 or one second electrode 22, so as to ensure that each electrode deforms little or no when the touch substrate is stretched, thereby preventing the electrodes from being damaged. When the touch substrate is not stretched, the position relationship between any one of the first electrodes 21 and the second electrode 22 is shown in fig. 3 a; when the touch substrate is stretched left and right, the distance between the first electrode 21 and the second electrodes 22 on both left and right sides increases, as shown in fig. 3 b. Of course, in the case where the island portion 11 and the spacer portion 12 are located on different layers, when the stretching force is not uniformly distributed on the touch substrate, there is a possibility that the stretching amount of the layer where the island portion 11 is located is smaller than that of the layer where the spacer portion 12 is located near the left edge of the touch substrate in fig. 3c, so that the distance between the first electrode 21 and the second electrode 22 on the right side is decreased, and the distance between the first electrode 21 and the second electrode 22 on the left side is increased.
As shown in fig. 1, at least two second electrodes 22 are disposed between every two adjacent first electrodes 21 in the same row, and at least two second electrodes 22 are also disposed between every two adjacent first electrodes 21 in the same column, so that more second electrodes 22 are disposed, the damage ratio of the second electrodes 22 due to stretching is reduced, and the touch sensitivity is further improved. The second electrodes 22 between two adjacent first electrodes 21 may be spaced apart from each other or connected together. In the present invention, two second electrodes 22 are disposed between every two adjacent first electrodes 21 in the same row and between every two adjacent first electrodes 21 in the same column, and at this time, each first electrode 21 and its adjacent four second electrodes 22 form a touch unit. As shown in fig. 3a, when the touch substrate is not deformed, in the plurality of second electrodes 22 adjacent to any one of the first electrodes 21, distances between the first electrode 21 and each of the second electrodes 22 are the same, so that the capacitance formed between the first electrode 21 and each of the second electrodes 22 is the same, and the driving circuit 30 detects whether touch occurs when the touch substrate is not deformed.
Further, in any one touch unit, the inner edge of each second electrode 22 (i.e., the edge facing the first electrode 21) is an arc-shaped edge; when the touch substrate is not stretched, the inner edges of the second electrodes 22 correspond to the same circle center, and the position of the orthographic projection of the circle center on the stretchable substrate 10 is the same as the position of the orthographic projection of the center of the first electrode 21 on the stretchable substrate 10. In addition, the outer edge of the second electrode 22 (i.e., the edge facing away from the first electrode 21) may also be an arc-shaped edge, and the outer edge and the inner edge of the second electrode 22 correspond to the same center of circle, so that the second electrode 22 is formed as a part of a ring-shaped structure.
As shown in fig. 4 to 6, the orthographic projection of the first electrode 21 on the stretchable substrate 10 may be a regular polygonal structure such as a regular quadrangle, a regular hexagon, a regular octagon, etc. Preferably, as shown in fig. 3a, the orthographic projection of the first electrode 21 on the stretchable substrate 10 is circular, so that the distance between the second electrode 22 and the first electrode 21 is equal everywhere, thereby ensuring that the capacitance formed by the first electrode 21 and the second electrode 22 is in a linear relationship with the distance between the two electrodes, and further ensuring that the capacitance changes little or unchanged when the first electrode 21 and the second electrode 22 are relatively close to or far away from each other.
Accordingly, the present invention further provides a touch device, which includes the touch substrate and the driving circuit 30. As shown in fig. 1, the driving circuit 30 is electrically connected to the first electrode 21 and the second electrode 22, and is used for providing a driving signal to one of the first electrode 21 and the second electrode 22 and detecting a signal induced to the other of the first electrode 21 and the second electrode 22. As described above, when the first electrodes 21 are driving electrodes, the second electrodes 22 are sensing electrodes, and the first electrodes 21 in the same row are connected to each other, the driving circuit 30 may provide driving signals to the first electrodes 21 row by row and detect sensing signals on each second electrode 22, so as to determine the touch position according to whether the sensing signals on each second electrode 22 are changed.
The touch device can further comprise a display panel, so that the touch device has touch and display functions.
As can be seen from the above description of the touch substrate and the touch device provided by the present invention, when the stretchable substrate deforms and the distance between the first electrode and the second electrode increases or decreases, the dielectric constant of the dielectric layer also increases or decreases accordingly, so that the capacitance value of the capacitor formed by the first electrode and the second electrode changes less or does not change, and further, the influence of the stretching of the touch substrate on the touch sensitivity is reduced, and the touch sensitivity of the touch device is improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A touch substrate is characterized by comprising a stretchable substrate, wherein a plurality of first electrodes and a plurality of second electrodes are arranged on the stretchable substrate, and the plurality of first electrodes are arranged in a plurality of rows and a plurality of columns; the second electrodes are arranged on two sides of each first electrode along the row direction and two sides of each first electrode along the column direction; the first electrode is a driving electrode, and the second electrode is an induction electrode;
every first electrode all is provided with the dielectric layer between rather than adjacent second electrode, the dielectric constant of dielectric layer is in increase when the dielectric layer receives the extension, reduce when the dielectric layer receives the extrusion, just the variation of dielectric constant with the deformation quantity positive correlation of dielectric layer, first electrode forms touch-control electric capacity rather than adjacent second electrode, touch-control electric capacity's size with the distance between first electrode and the second electrode is anti-correlation, with the dielectric constant positive correlation of dielectric layer between first electrode and the second electrode.
2. The touch substrate of claim 1, wherein the dielectric layer comprises polyvinylidene fluoride.
3. The touch substrate of claim 1, wherein the stretchable substrate comprises a plurality of islands and spacers separating the plurality of islands from each other, the islands having a modulus of elasticity greater than the modulus of elasticity of the spacers;
at least a part of the first electrodes and/or at least a part of the second electrodes are arranged on the islands, and each island is provided with one first electrode or one second electrode; a dielectric layer between the first electrode and the second electrode is located at the spacer.
4. The touch substrate of claim 3, wherein each first electrode and each second electrode is disposed on the island.
5. The touch substrate of claim 1, wherein at least two of the second electrodes are disposed between every two adjacent first electrodes in a same row and between every two adjacent first electrodes in a same column,
when the stretchable substrate is not deformed, the distance between the first electrode and each of the second electrodes is the same among the plurality of second electrodes adjacent to any one of the first electrodes.
6. The touch substrate of claim 5, wherein for any one first electrode and the plurality of second electrodes adjacent to the first electrode, an edge of each second electrode facing the first electrode is an arc-shaped edge; and when the stretchable substrate is not stretched, the arc-shaped edges of the plurality of second electrodes correspond to the same circle center, and the position of the orthographic projection of the circle center on the stretchable substrate is the same as the position of the orthographic projection of the center of the first electrode on the stretchable substrate.
7. The touch substrate of any one of claims 1 to 6, wherein an orthographic projection of the first electrode on the stretchable substrate is a circle or a regular polygon.
8. The touch substrate of any one of claims 1 to 6, wherein the first electrodes in the same row are sequentially connected, and the first electrodes in different rows are insulated and spaced; or the plurality of first electrodes in the same column are connected in sequence, and the first electrodes in different columns are insulated and spaced.
9. A touch device comprising the touch substrate according to any one of claims 1 to 8 and a driving circuit for supplying a driving signal to one of the first electrode and the second electrode and detecting a signal induced to the other electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810489155.4A CN108762555B (en) | 2018-05-21 | 2018-05-21 | Touch substrate and touch device |
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| CN201810489155.4A CN108762555B (en) | 2018-05-21 | 2018-05-21 | Touch substrate and touch device |
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| CN108762555A CN108762555A (en) | 2018-11-06 |
| CN108762555B true CN108762555B (en) | 2021-12-03 |
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| CN109976595A (en) * | 2019-03-25 | 2019-07-05 | 合肥京东方光电科技有限公司 | A kind of touch base plate, display panel and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103250218A (en) * | 2010-09-10 | 2013-08-14 | 小利兰·斯坦福大学托管委员会 | Interface apparatus and methods |
| CN107066160A (en) * | 2017-05-16 | 2017-08-18 | 京东方科技集团股份有限公司 | Touch base plate and preparation method thereof, display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103970317B (en) * | 2013-01-28 | 2017-09-12 | 宸鸿科技(厦门)有限公司 | Touch-control sensor and contact panel |
| CN104571766B (en) * | 2015-01-19 | 2019-11-19 | 深圳市力驰创新科技有限公司 | The input operating method of input unit |
| CN104679340A (en) * | 2015-03-20 | 2015-06-03 | 合肥鑫晟光电科技有限公司 | Touch substrate and display device |
| CN105677130B (en) * | 2016-04-08 | 2018-10-02 | 京东方科技集团股份有限公司 | Pressure sensitivity touch control method, pressure sensitivity touch device and pressure-sensitive touch screen |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103250218A (en) * | 2010-09-10 | 2013-08-14 | 小利兰·斯坦福大学托管委员会 | Interface apparatus and methods |
| CN107066160A (en) * | 2017-05-16 | 2017-08-18 | 京东方科技集团股份有限公司 | Touch base plate and preparation method thereof, display device |
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