TWI469029B - Method for detecting a touched position on a touch device - Google Patents

Description

Method for detecting touch position of touch device

The present invention relates to a method for detecting a touch position of a touch device, and particularly to a method for detecting a touch position of a resistive touch device.

Please refer to FIG. 1 , which is a cross-sectional view of a conventional resistive touch panel. The conventional resistive touch panel 10 mainly includes a first conductive layer 12, a second conductive layer 14, and a plurality of spacers 16 disposed on the first conductive layer 12 and the second conductive layer 14. The first conductive layer 12 and the second conductive layer 14 are separated to avoid a short circuit and cause an erroneous action. The first conductive layer 12 and the second conductive layer 14 are respectively responsible for detecting different axial positions of the touch, for example, the first conductive layer 12 is responsible for detecting the position of the X axis, and the second conductive layer 14 is responsible for detecting the Y axis. Towards the location.

In operation, the first conductive layer 12 and the second conductive layer 14 are each applied with a different voltage. When the user touches the touch panel 10, the corresponding touch area of the first conductive layer 12 and the second The regions of the corresponding contact portions of the conductive layer 14 are in contact with each other to cause voltage changes in the first conductive layer 12 and the second conductive layer 14, respectively. By detecting the voltage change of the first conductive layer 12, it is known that the touch is in the X-axis. The position is detected, and the position of the touch in the Y-axis is known by detecting the voltage change of the second conductive layer 14.

In an ideal state, the position touched by the touch panel 10 should be equal to the actual position of the touch, but due to the spacing between the conductive lines in the first conductive layer 12, The influence of the spacing between the conductive lines in the second conductive layer 14 and the data processing method used may cause an error such that the position of the detected touch is not the same as the actual position of the touch.

The present invention provides a method for detecting a touch position of a touch device to solve the conventional problems.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

In order to achieve the above object, a method for detecting a touch position of a touch device has a first conductive layer and a side of the first conductive layer. a plurality of sensing electrodes, wherein the sensing electrodes are spaced apart from each other, the method for detecting a touch position includes: providing a first voltage to the first conductive layer; touching the touch device to make the first conductive layer The first voltage is changed in a region, wherein the region corresponds to a touch point of the touch device, the touch portion has a touch position; and the sensing electrodes are measured to obtain a plurality of voltage signals; And obtaining a first sensing position according to the voltage signal and a position estimation mode; and obtaining a second sensing position according to the first sensing position and a correction mode, wherein the second sensing position is equal to the The touch mode has a first curve relationship.

Another embodiment of the present invention discloses a method for detecting a touch position of a touch device, the touch device having a first conductive layer and a plurality of first sides disposed on one of the first conductive layers a sensing electrode, the sensing electrodes are spaced apart from each other, and the method for detecting a touch position comprises: providing a first voltage to the first conductive layer; The touch device is configured to change the first voltage of a region of the first conductive layer, wherein the region corresponds to a touch point of the touch device, the touch portion has a touch position; The plurality of voltage signals are obtained by the sensing electrodes, wherein the voltage signals comprise an extreme voltage signal, a first voltage signal and a second voltage signal, and the sensing electrodes comprise a first sensing electrode, a first a second sensing electrode and a third sensing electrode, wherein the first voltage signal is obtained from the first sensing electrode, and the extreme voltage signal is obtained from the second sensing electrode, the second voltage signal is Obtaining the third sensing electrode, the second sensing electrode is located between the first sensing electrode and the third sensing electrode, and the second sensing electrode and the first sensing electrode are respectively The third sensing electrode is adjacent to each other; the second voltage signal is adjusted according to a voltage adjustment mode to obtain a modified voltage signal; and the first voltage signal, the extreme voltage signal, the modified voltage signal, and a position estimation mode are obtained. a first sensing position; and according to the A sensing position and a correction pattern obtained by sensing a second position, wherein the second sensing position is equal to the touch position, the calibration mode has a first curve relation.

In summary, the method for detecting the touch position in the embodiment of the present invention uses the position estimation mode to generate the first sensing position, and then uses the correction mode to correct the first sensing position. The second sensing position is generated. At this time, the second sensing position is equal to the touch position, so the X value of the touch is located, and the position of the touch is detected, and the conventional error is solved. problem.

Please refer to FIG. 2, which is a cross-sectional view of a touch device according to an embodiment of the present invention. The touch device 20 includes a first substrate 22 and a pair disposed opposite to each other. The second substrate 24, a first conductive layer 26, a second conductive layer 28 and a plurality of spacers 30, the first substrate 22 is generally a polyester film, and the second substrate 24 is generally a glass substrate, the first conductive layer 26 is disposed on a surface of the first substrate 22 facing the second substrate 24, the second conductive layer 28 is disposed on a surface of the second substrate 24 facing the first substrate 22, and the second conductive layer 28 is opposite to the first conductive layer 26. The spacers 30 are disposed between the first conductive layer 26 and the second conductive layer 28 and have an insulating and supporting function, so that the first conductive layer 26 and the second conductive layer 28 are not pressed on the touch device 20. The state of electrical separation is maintained.

Please refer to FIG. 3 , which is a schematic diagram showing the relative positions of the first conductive layer and the second conductive layer of the touch device in FIG. 2 . The touch device 20 further has a plurality of sensing electrodes 34 disposed on the first side 32 of the first conductive layer 26. The sensing electrodes 34 are spaced apart from each other and disposed on one side of the second conductive layer 36. a plurality of sensing electrodes 38 spaced apart from each other, and a side 36 of the second conductive layer 28 on which the sensing electrodes 38 are disposed is adjacent to a vertical first side 32 of the first conductive layer 26 The second side 40, and the first conductive layer 26 has an impedance anisotropy, such as a carbon nanotube film, the conductive direction is substantially parallel to the Y-axis direction, and the second conductive layer 28 has an impedance anisotropy, for example, The carbon nanotube film has a conductive direction substantially parallel to the X-axis direction. In addition, the first conductive layer 26 has a second boundary region 42 and a non-boundary region 44. The boundary region 42 located on the upper right side of the first conductive layer 26 in FIG. 3 is located at a first line A and a second line B. Between the first line A and the sensing electrode closest to the second side 40 of the sensing electrodes 34 (the first sensing electrode from the second side) extends parallel to the second side 40, the second line B from the sensing electrodes 34 The middle of the second sensing side electrode adjacent to and adjacent to the sensing electrode closest to the second side 40 (the positive between the second sensing electrode and the third sensing electrode from the second side 40) The middle portion extends and is parallel to the second side 40, and the other boundary portion 42 is located on the lower left side of the first conductive layer 26 in FIG. 3, opposite to the boundary portion 42 on the upper right side, and is located between the two straight lines. The second sensing line extends from the first sensing electrode of the first side of the first conductive layer 26 and the second sensing electrode and the third sensing electrode from the third side 45 It extends in the middle and is parallel to the third side 45, and the third side 45 is opposite to the second side 40. The non-boundary region 44 is located between the two boundary regions 42. Similarly, the second conductive layer 28 also has a two-boundary region 46 and a non-boundary region 48, and the two boundary regions 4 are respectively located in the second conductive layer in FIG. 28 on the lower right side and upper left side.

Please refer to FIG. 4, which is a flow chart of a method for detecting a touch position according to an embodiment of the present invention. The embodiment of the present invention discloses a method for detecting a touch position of the touch device 20. The position of the user touching the touch device 20 is represented by an XY plane coordinate system, so the current touch point is Having an X-axis touch position and a Y-axis touch position, the sensing electrodes 34 of the first conductive layer 26 are configured to detect the X-axis touch position of the touch, the second conductive layer The sensing electrodes 38 of the 28 are used to detect the Y-axis touch position of the touch, and the following is first described by detecting the X-axis touch position. The method for detecting the X-axis touch position is: Step S10: providing a first voltage, for example, 0 volts, to the sensing electrodes 34 on the first conductive layer 26, so that the first conductive layer 26 is filled with the first a voltage, and mention Providing a second voltage different from the first voltage, for example, 5 volts, to the sensing electrodes 38 on the second conductive layer 28, causing the second conductive layer 28 to fill the second voltage; Step S15: Touching The control device 20 causes the corresponding region of the first conductive layer 26 to be touched, that is, the pressed region, to contact the region of the second conductive layer 28 corresponding to the touch, that is, the first conductive layer 26 The area touched by the pressed area causes the first voltage of the area of the first conductive layer 26 corresponding to the touch to be changed; step S20: sequentially measuring the senses disposed on the first conductive layer 26 Measuring electrode 34 to obtain a plurality of voltage signals; step S25: obtaining a first X-axis sensing position according to the voltage signals and a position estimating mode; and step S30: sensing the position according to the first X-axis and The calibration mode obtains a second X-axis sensing position, wherein the second X-axis sensing position is equal to the X-axis touch position, and the calibration mode has a first curve relationship, such as a first waveform Curve relationship.

The voltage signals include an extreme voltage signal, a first voltage signal and a second voltage signal. The extreme voltage signal is the largest of the voltage signals. The sensing electrodes 34 include a first sensing electrode. a second sensing electrode and a third sensing electrode, the first voltage signal is obtained from the first sensing electrode, and the extreme voltage signal is obtained from the second sensing electrode, the second voltage The signal is obtained from the third sensing electrode, the second sensing electrode is located between the first sensing electrode and the third sensing electrode, and the second sensing electrode and the first sensing respectively The electrode and the third sensing electrode are adjacent to each other, the first sensing electrode, the second sensing electrode, and the third sensing power It is arranged in the X axis.

Each of the sensing electrodes 34 is spaced apart from each other. The plurality of operational parameters included in the position estimation mode includes a difference between the extreme voltage signal and the first voltage signal, the extreme voltage signal and the The difference between the two voltage signals and the spacing, the position estimation mode contains three equations, as follows:

Where Δ1 is the difference between the extreme voltage signal minus the first voltage signal, Δ2 is the difference between the extreme voltage signal minus the second voltage signal, and P _{x is} the spacing, and ΔS is the first X The axial sensing position is reduced by a difference in position of the second sensing electrode at the X-axis.

There is an error value between the first X-axis sensing position and the actual X-axis touch position calculated according to the position estimation mode. Please refer to FIG. 5 , which is a schematic diagram of coordinates of the first X-axis sensing position and the X-axis touch position, and the system measures the position of the second sensing electrode at the X-axis C plus 0.5P. _x (point E) and the position of the second sensing electrode in the X-axis position minus 0.5P _x (point D), the complex X-axis touch position and the corresponding X-axis touch The plurality of first X-axis sensing positions of the position, wherein the horizontal axis represents the first X-axis sensing position and the vertical axis represents the X-axis touch position, as can be seen from FIG. 5, according to the position estimation mode There is a second waveform relationship G between the first X-axis sensing position and the X-axis touch position, and is not in a straight line F relationship with a slope of 1, that is, the first X-axis sensing position and the The X-axis touch positions are not equal, and there is a difference therebetween. Therefore, the correction mode of step S30 is further performed, and the first waveform curve relationship of the correction mode is represented by H, and the first waveform relationship H and the The two waveform relationship G is inverted, and the first waveform relationship H and the second waveform relationship G are both located at the second sensing electrode. The position C of the X axis is an inflection point.

The calibration mode has an association established according to the first X-axis sensing position and the X-axis touch position, as shown by the first waveform relationship H, which may be based on the first waveform relationship H The X-axis sensing position is corrected to obtain a second X-axis sensing position, the second X-axis sensing position will be equal to the X-axis touch position of the current touch, thereby positioning the The X-axis touch position at the touch. Alternatively, the calibration mode includes a compensation table, and the plurality of data in the compensation table exhibits a first waveform relationship H, and the data in the compensation table is located at a position C± located at the X-axis of the second sensing electrode. Each of the X-axis touch positions in the interval of 0.5P _x (D and C points) is formed by subtracting one of the first X-axis sensing positions, so that the compensation table can be obtained by querying And a difference between the first X-axis sensing position and the first X-axis sensing position is added, and the second X-axis sensing position is obtained by adding the first X-axis sensing position to the difference. The second X-axis sensing position will be equal to the X-axis touch position of the current touch, thereby locating the X-axis touch position of the touch.

The method for detecting the X-axis touch position disclosed above is suitable for the current touch location in the non-boundary region 44 of the first conductive layer 26, if the touch is currently located at the first conductive layer 26 In any of the boundary regions 42, the second voltage signal is subjected to the following voltage adjustment mode to adjust the voltage and then brought into the position estimation mode. The formula is not directly brought into the position estimation mode as described above. Hereinafter, the boundary region 42 (hereinafter referred to as the first boundary region 42) located on the upper right side of the first conductive layer 26 in FIG. 3 is taken as an example for description. Similarly, the touch can be located at another location. The processing in the border area 42 is not described here.

If the touch is located in the first boundary region 42 of the first conductive layer 26, it indicates that the X-axis touch position is between the first line A and the second line B of the first conductive layer 26 and the first The three sensing electrodes are the ones of the sensing electrodes on the first conductive layer 26 that are closest to the second side 40 of the first conductive layer 26. The voltage adjustment mode has an association established according to the first voltage, a third voltage signal, and a fourth voltage signal, and the manner of obtaining the third voltage signal and the fourth voltage signal is as follows: when the first When the first line of the intermediate line 42 of the conductive layer 26 is changed by the touch, the third voltage signal is obtained from the third sensing electrode, and the fourth voltage signal is from the second The sensing electrode is obtained. The intermediate line 42 is located in the middle of the first line A and the third line J. The third line J extends from the second sensing electrode and is parallel to the second side 40, and the intermediate line 42 The first voltage is changed from the first side 32 by a distance equal to the distance of the touch position from the first side 32.

The voltage adjustment mode can be expressed by one program: V4=Vr-(Vr-V3)×(Vr-V2)/(Vr-V1), wherein V1 is the third voltage signal, and V2 is the fourth The voltage signal, V3 is the second voltage signal, V4 is a modified voltage signal, and Vr is the first voltage.

Therefore, when the current X-axis touch position is located in the first boundary region 42 of the first conductive layer 26, the second voltage signal obtained from the third sensing electrode is subjected to the After the voltage adjustment mode is adjusted, the corrected voltage signal is obtained, and the first voltage signal, the extreme voltage signal and the corrected voltage signal are brought into the position estimation mode to obtain a first X-axis sensing position. At this time, the Δ2 in the three equations included in the position estimation mode is the difference between the extreme voltage signal minus the corrected voltage signal. Then, the above step S30 is performed to obtain a second X-axis sensing position, which will be equal to the X-axis touch position located in the first boundary region 42.

The method for detecting the Y-axis touch position is the same as the method for detecting the X-axis touch position, and the difference is caused by the difference in the axial direction, and the first touch is made when the touch device 20 is touched. When the conductive layer 26 and the second conductive layer 28 are in contact, the corresponding region of the first conductive layer 26 at the touch is boosted, and the corresponding region of the second conductive layer 28 at the touch is stepped down. Therefore, the extreme voltage signal used in the method for detecting the Y-axis touch position is the minimum value among the voltage signals. In addition to the difference point described above, the method for detecting the Y-axis touch position can be obtained by the method for detecting the X-axis touch position disclosed above, and thus is not described herein again.

In summary, the method for detecting the X-axis touch position in the embodiment of the present invention utilizes a position estimation mode to generate the first X-axis sensing position, and then corrects the correction mode by using the correction mode. The first X-axis sensed position generates the second X-axis sensed position, and at this time, the second X-axis sensed position will be equal to the X-axis touched position, thereby positioning the touched portion The X value, in the same way, also uses the method of detecting the Y-axis touch position to locate the Y value of the touch, thereby detecting the position of the touch, and solving the conventional error problem.

Although the present invention is disclosed above by way of example, it is not intended to limit the present invention. It is to be understood that the scope of the present invention is defined by the scope of the appended claims. quasi. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

10‧‧‧Touch panel

12‧‧‧First conductive layer

14‧‧‧Second conductive layer

16‧‧‧ interval ball

20‧‧‧ touch device

22‧‧‧First substrate

24‧‧‧second substrate

26‧‧‧First conductive layer

28‧‧‧Second conductive layer

30‧‧‧ interval ball

32‧‧‧First side

34‧‧‧Sensing electrode

36‧‧‧ side

38‧‧‧Sensing electrode

40‧‧‧Second side

42‧‧‧Boundary area, first border area

44‧‧‧Non-boundary area

45‧‧‧ third side

46‧‧‧ border zone

48‧‧‧Non-boundary area

A‧‧‧ first line

B‧‧‧ second line

C‧‧‧The position of the second sensing electrode in the X-axis

D‧‧‧The position of the second sensing electrode in the X-axis is reduced by 0.5P _x

E‧‧‧The position of the second sensing electrode in the X-axis plus 0.5P _x

F‧‧‧ Straight line

G‧‧‧Second waveform relationship

H‧‧‧First waveform relationship

J‧‧‧ third line

FIG. 1 is a schematic cross-sectional view of a conventional resistive touch panel.

2 is a schematic cross-sectional view of a touch device applied to an embodiment of the present invention.

3 is a schematic view showing the relative positions of the first conductive layer and the second conductive layer of the touch device in FIG. 2.

4 is a flow chart of a method of detecting a touch position according to an embodiment of the present invention.

Figure 5 is a schematic diagram of the coordinates of the first X-axis sensing position and the X-axis touch position.

Claims (19)

A method for detecting a touch position of a touch device, the touch device having a first conductive layer and a plurality of sensing electrodes disposed on one side of the first conductive layer, the sensing electrodes are mutually The method of detecting a touch position includes: providing a first voltage to the first conductive layer; touching the touch device to change the first voltage of a region of the first conductive layer, wherein The touch area corresponding to the touch device has a touch position; the touch electrodes are measured to obtain a plurality of voltage signals, wherein the voltage signals include an extreme voltage signal, a first voltage signal and a second voltage signal, the extreme voltage signal must be a maximum or a minimum of the voltage signals, and the sensing electrodes include a first sensing electrode and a second sensing electrode And a third sensing electrode, the first voltage signal is obtained from the first sensing electrode, the extreme voltage signal is obtained from the second sensing electrode, and the second voltage signal is derived from the third sensing Obtaining the electrode, the second sensing electrode is located Between the first sensing electrode and the third sensing electrode, and the second sensing electrode is adjacent to the first sensing electrode and the third sensing electrode, wherein the third sensing electrode is the One of the sensing electrodes closest to the other side of the first conductive layer and the other side of the first conductive layer is located between a first line and a second line, wherein the first line is from the first line The three sensing electrodes extend and are parallel to the other side, and the second line extends from the middle of the second sensing electrode and the first sensing electrode and is parallel to the other side, wherein the sensing electrodes Each adjacent two The plurality of operational parameters included in the position estimation mode include a difference between the extreme voltage signal and the first voltage signal, a difference between the extreme voltage signal and the second voltage signal, and the spacing; The first sensing position is obtained by the voltage signal and the position estimating mode; and a second sensing position is obtained according to the first sensing position and a correction mode, wherein the second sensing position is equal to the touch The touch mode has a first curve relationship. The method for detecting a touch position according to claim 1, wherein the first curve relationship of the correction mode is a first waveform relationship. The method for detecting a touch position according to the second aspect of the invention, wherein the second waveform curve exists between the first sensing position and the touch position obtained by the position estimating mode, and the second waveform curve The relationship is inverse to the relationship of the first waveform. The method for detecting a touch position according to claim 2, wherein the first waveform relationship is an inflection point of a position of the second sensing electrode. The method for detecting a touch position according to claim 2, wherein the correction mode comprises a compensation table, and the plurality of data in the compensation table exhibits the first waveform relationship. The method for detecting a touch position according to claim 5, wherein the data in the compensation table has a difference between the touch position and the first sensing position. The method of detecting a touch position according to claim 1, wherein the first conductive layer has impedance anisotropy. The method for detecting a touch position according to the seventh aspect of the invention, wherein the touch device further has a second conductive layer overlapping with the first conductive layer, and the method for detecting the touch position is further The method includes: providing a second voltage to the second conductive layer, wherein the second voltage is different from the first voltage, wherein in the step of touching the touch device, the first conductive layer is opposite to the touch The region is in contact with a region of the second conductive layer that is in contact with the second conductive layer to cause the first voltage to be changed. A method for detecting a touch position of a touch device, the touch device having a first conductive layer and a plurality of sensing electrodes disposed on a first side of the first conductive layer, the sensing The electrodes are spaced apart from each other, and the method for detecting a touch position includes: providing a first voltage to the first conductive layer; touching the touch device to change the first voltage of a region of the first conductive layer Where the area corresponds to a touch point of the touch device, the touch area has a touch position; the sensing electrodes are measured to obtain a plurality of voltage signals, wherein the voltage signals include an extreme voltage The signal, the first voltage signal and the second voltage signal, the extreme voltage signal must be the maximum or minimum of the voltage signals, and the sensing electrodes include a first sensing electrode and a second sensing a first voltage signal is obtained from the first sensing electrode, and the extreme voltage signal is obtained from the second sensing electrode, the second voltage The signal is obtained from the third sensing electrode, the second sensing electrode is located between the first sensing electrode and the third sensing electrode, and the second sensing electrode and the first sensing electrode are respectively And the third sensing electrode is adjacent to the third sensing electrode, wherein the third sensing edge of the first sensing layer is closest to the second side of the first side of the first conductive layer and the touch position Between a first line and a second line, wherein the first line extends from the third sensing electrode and is parallel to the second side, the second line from the second sensing electrode and the first Between the sensing electrodes extending in the middle and parallel to the second side; adjusting the second voltage signal according to a voltage adjustment mode to obtain a modified voltage signal; according to the first voltage signal, the extreme voltage signal, the correction voltage a first sensing position is obtained by the signal and a position estimating mode; and a second sensing position is obtained according to the first sensing position and a correction mode, wherein the second sensing position is equal to the touch position, The correction mode has a first curve relationship. The method of detecting a touch position according to claim 9, wherein the touch device further has a second conductive layer and a plurality of sensing electrodes disposed on one side of the second conductive layer, The second conductive layer is overlapped with the first conductive layer, and the second side of the first conductive layer is adjacent to the side of the second conductive layer. The method for detecting a touch position according to claim 9 , wherein the voltage adjustment mode has an association established according to the first voltage, a third voltage signal, and a fourth voltage signal, when the first One of the middle layers of a conductive layer is touched And changing the first voltage of the intermediate line, the third voltage signal is obtained from the third sensing electrode, and the fourth voltage signal is obtained from the second sensing electrode, where the intermediate line is located In the middle of the first line and the third line, the third line extends from the second sensing electrode and is parallel to the second side. The method for detecting a touch position according to claim 11, wherein the voltage adjustment mode includes a program of: V4=Vr-(Vr-V3)×(Vr-V2)/(Vr- V1), wherein V1 is the third voltage signal, V2 is the fourth voltage signal, V3 is the second voltage signal, V4 is the correction voltage signal, and Vr is the first voltage. The method for detecting a touch position according to claim 11, wherein a position at which the first voltage of the intermediate line is changed is a distance from the first side is equal to a distance from the first side of the touch position. The distance between the sides. The method for detecting a touch position according to claim 9, wherein each of the sensing electrodes is spaced apart from each other, and the plurality of operation parameters included in the position estimation mode includes the extreme value The difference between the voltage signal and the first voltage signal, the difference between the extreme voltage signal and the corrected voltage signal, and the spacing. The method for detecting a touch position according to claim 9 , wherein the first curve relationship of the correction mode is a first waveform relationship. The method for detecting a touch position according to claim 15 , wherein the first waveform relationship is an inflection point of the position of the second sensing electrode. The method for detecting a touch position according to claim 15 , wherein the correction mode is a compensation table, and the plurality of data in the compensation table presents the first wave Shape curve relationship. The method for detecting a touch position according to claim 17, wherein the data in the compensation table has a difference between the touch position and the first sensing position. The method of detecting a touch position according to claim 9, wherein the first conductive layer has impedance anisotropy.