Sensing method of touch panel
By adopting multiple independent electrodes and different scanning modes on the touch panel, the problem of poor sensing accuracy under water and palm interference is solved, and a more accurate judgment of contact position is achieved.
Patent Information
- Application Number
- CN202510106406.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-12-27
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-30
AI Technical Summary
When existing touch panels encounter water or large objects (such as palms), it is difficult to accurately determine the contact position, resulting in poor sensing effect.
A touch panel consisting of multiple independent electrodes is used to handle different situations through different scanning modes. The specific steps include: in the first scanning mode, the electrode to be sensed, its adjacent electrodes and electrodes outside the special area are applied in an in-phase driving signal, while the electrodes in the special area do not apply in-phase driving signal.
It effectively improves the sensing accuracy under water and palm interference, can correctly judge the position of the object touching the touch panel, and improves the sensing effect.
Smart Images
Figure CN120066318A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a sensing method for a touch panel, and more particularly to a sensing method for improving water and palm interference. Background Art
[0002] Existing touch panels can determine whether there is a finger contact and the contact position through the sensing information generated by self-capacitance scanning, but there is still a need for a scanning mechanism that can respond to the situation of water or a large-area object (such as a palm) on the touch panel. Summary of the Invention
[0003] One object of the present invention is to provide a touch panel sensing method that can improve water and palm interference.
[0004] The present invention provides a sensing method for a touch panel, the touch panel having a plurality of independent electrodes, the sensing method comprising the following steps: A. determining a special area on the touch panel, wherein the special area includes a contact area of a non-intentionally contacted object; and B. after step A, entering a first scanning mode to scan the touch panel, wherein, in the first scanning mode, in-phase driving signals are applied to the electrode to be sensed, its adjacent electrodes, and other electrodes outside the special area, and at least a part of the electrodes in the special area are not applied with in-phase driving signals. Brief Description of the Drawings
[0005] Figure 1 Showing an embodiment of a touch panel.
[0006] Figure 2 Showing an embodiment of the sensing method of the touch panel of the present invention.
[0007] Figure 3 Showing Figure 1 An embodiment of the touch panel performing the third scanning mode.
[0008] Figure 4 Showing Figure 1 An embodiment of the touch panel performing the second scanning mode.
[0009] Figure 5 Showing the special area of the touch panel.
[0010] Figure 6 Showing the first scanning situation of the first scanning mode.
[0011] Figure 7 Showing the second scanning situation of the first scanning mode.
[0012] Figure 8 Showing Figure 6 Another embodiment of the scanning situation shown.
[0013] Figure 9 Display Figure 7 Another embodiment of the scanning condition shown.
[0014] Explanation of reference numerals: 10 - touch panel; 11 - electrode; 13 - special area; S10 - step; S11 - step; S12 - step; S13 - step; S14 - step. Detailed implementation manner
[0015] Figure 1 Displays an embodiment of the capacitive touch panel of the present invention. The touch panel 10 can be transparent or opaque. Figure 1 The touch panel 10 has a plurality of independent electrodes 11. The plurality of independent electrodes 11 form a 12×12 array. The plurality of independent electrodes 11 form an operation area for the user to input. The touch panel 10 obtains the induction amounts of the plurality of electrodes 11 through self-capacitance scanning, and then determines whether there is finger contact and the contact position.
[0016] Figure 2 Displays an embodiment of the sensing method of the touch panel of the present invention. As Figure 2 shown, in step S10, the touch panel 10 scans the plurality of independent electrodes 11 in a third scanning mode. The scanning method of the third scanning mode is to apply the in-phase drive signal to the electrode 11 to be sensed and all other electrodes 11, but only read the signal of the electrode 11 to be sensed. As Figure 3 shown, all the electrodes 11 are applied with the in-phase drive signal. The electrodes 11 in the Y3 column marked with a mesh line are applied with the in-phase drive signal and are to be sensed. In the case of a wet (or sweaty) finger or water on the operation area of the touch panel 10, the third scanning mode can correctly determine the position where an object touches the touch panel 10. In one embodiment, after step S10 is performed one or more times, step S11 is then performed.
[0017] In step S11, the touch panel 10 scans the plurality of independent electrodes 11 in a second scanning mode. The second scanning mode is to apply the in-phase drive signal to the electrode 11 to be sensed and the electrodes 11 adjacent to it, and the remaining electrodes 11 are not applied with the in-phase drive signal. As Figure 4 shown, the electrodes 11 in the Y5 column are the electrodes to be sensed, and the electrodes 11 adjacent to the electrodes 11 in the Y5 column are all applied with the in-phase drive signal. The electrodes 11 adjacent to the electrode 11 to be sensed refer to the electrodes 11 within a preset range from the electrode 11 to be sensed, and this preset range can be one electrode or multiple electrodes. As Figure 4For example, the electrode 11 adjacent to the electrode 11 to be sensed refers to the electrode 11 closest to the electrode 11 to be sensed above the electrode 11 to be sensed, the electrode 11 closest to the electrode 11 to be sensed below the electrode 11 to be sensed, the electrode 11 closest to the electrode 11 to be sensed to the left of the electrode 11 to be sensed, and the electrode 11 closest to the electrode 11 to be sensed to the right of the electrode 11 to be sensed. However, the present invention is not limited thereto. In different embodiments, the electrode 11 adjacent to the electrode 11 to be sensed may also refer to the three electrodes 11 closest to the electrode 11 to be sensed above the electrode 11 to be sensed, the three electrodes 11 closest to the electrode 11 to be sensed below the electrode 11 to be sensed, the three electrodes 11 closest to the electrode 11 to be sensed to the left of the electrode 11 to be sensed, and the three electrodes 11 closest to the electrode 11 to be sensed to the right of the electrode 11 to be sensed. The other electrodes 11 not applied with the in-phase driving signal may be grounded, floating, or applied with a preset voltage, where the preset voltage is different from the voltage value of the in-phase driving signal. When a non-intentional contact object (such as a palm) contacts the touch panel 10, using the second mode helps to determine whether there is a non-intentional contact object contacting, and to determine the area where the non-intentional contact object contacts. As for the technology of determining whether there is a non-intentional contact object contacting and determining its contact area, it is well known to those of ordinary skill in the touch field and will not be elaborated herein.
[0018] In other embodiments, the order and number of executions of the above steps S10 and S11 can have different changes and combinations. For example, execute step 10 multiple times first, and then perform step S11 once or multiple times. Or perform step 10 once, and then perform step S11 multiple times.
[0019] Refer to Figure 2 , after step S11 is completed, step S12 is performed. Step S12 is to determine whether there is a non-intentional contact object (such as a palm) contacting the touch panel 10 according to the scanning result of the second scanning mode. If not, return to step S10. If so, perform step S13.
[0020] According to the scanning result of the second scanning mode, the contact area of the non-intentional contact object (such as a palm) can be obtained. Step S13 is to determine a special area according to the contact area, and the special area includes the contact area of the non-intentional contact object. Taking Figure 5 as an example, the part surrounded by the dotted line is the special area 13, which includes the contact area of the non-intentional contact object (such as a palm).
[0021] After determining the special area 13, step S14 is performed. Step S14 scans the touch panel 10 in a first scanning mode. In this first scanning mode, in-phase drive signals are applied to the electrode 11 to be sensed, its adjacent electrodes 11, and other electrodes 11 outside the special area 13, and at least a part of the electrodes 11 in the special area 13 are not applied with in-phase drive signals. The electrodes 11 adjacent to the electrode 11 to be sensed refer to the electrodes 11 within a preset range from the electrode 11 to be sensed, and this preset range can be one electrode or multiple electrodes. For Figure 6 example, all the electrodes 11 in the Y3 column are the electrodes to be sensed. The electrodes adjacent to the electrode 11 to be sensed refer to the one electrode closest to the electrode 11 to be sensed above the electrode 11 to be sensed, the one electrode closest to the electrode 11 to be sensed below the electrode 11 to be sensed, the one electrode closest to the electrode 11 to be sensed to the left of the electrode 11 to be sensed, and the one electrode closest to the electrode 11 to be sensed to the right of the electrode 11 to be sensed, but the present invention is not limited thereto. As Figure 6 shown, all the electrodes 11 in the Y3 column are the electrodes to be sensed. In this first scanning mode, the electrodes in the Y3 column to be sensed, the Y2 column and Y4 column electrodes adjacent to the Y3 column, and other electrodes 11 outside the special area 13 are all applied with in-phase drive signals. A part of the electrodes 11 (such as multiple electrodes shown as blanks) in the special area 13 are not applied with in-phase drive signals. The electrodes 11 not applied with in-phase drive signals can be grounded, floating, or applied with a preset voltage, where the preset voltage is different from the voltage value of the in-phase drive signal.
[0022] In this first scanning mode of step S14, when at least one of the multiple electrodes 11 in the special area 13 is to be sensed, in-phase drive signals are applied to the multiple electrodes 11 outside the special area 13, the at least one electrode 11 to be sensed and its adjacent electrodes are applied with the in-phase drive signal, and at least one of the remaining electrodes 11 in the special area 13 is not applied with the in-phase drive signal. For Figure 7 example. The Y5 column is the electrode to be sensed. There are 5 electrodes 11 in the Y5 column within the special area 13. In-phase drive signals are applied to the multiple electrodes 11 outside the special area 13, and the 5 second electrodes 11 in the Y5 column within the special area 13 and their adjacent electrodes are all applied with in-phase drive signals. Other electrodes 11 (such as multiple electrodes shown as blanks in the figure) in the special area 13 are not applied with in-phase drive signals. The electrodes adjacent to the electrode 11 to be sensed refer to the electrodes within a preset range from the electrode 11 to be sensed, and this preset range can be one electrode or multiple electrodes. For Figure 7For example, the electrodes adjacent to the electrode 11 to be sensed refer to the electrode closest to the electrode 11 to be sensed above the electrode 11 to be sensed, the electrode closest to the electrode 11 to be sensed below the electrode 11 to be sensed, the electrode closest to the electrode 11 to be sensed to the left of the electrode 11 to be sensed, and the electrode closest to the electrode 11 to be sensed to the right of the electrode 11 to be sensed. However, the present invention is not limited thereto. In Figure 7 , the electrode 11 not applied with the in-phase drive signal may be grounded, floating, or applied with a preset voltage, where the preset voltage is different from the voltage value of the in-phase drive signal.
[0023] From Figure 6 And Figure 7 of the embodiments, it can be seen that the electrodes 11 not applied with the in-phase drive signal in the special area 13 are all electrodes other than the electrode to be sensed and its adjacent electrode within the special area 13 (such as Figure 6 And Figure 7 the blank electrodes shown), but the present invention is not limited thereto. In different embodiments, Figure 6 And Figure 7 shown, a part of the blank electrodes can also be applied with the in-phase drive signal, as long as a part of the blank electrodes are not applied with the in-phase drive signal. For example, Figure 8 And Figure 9 shown configuration, where the electrodes marked with diagonal lines or mesh lines in the special area 13 are applied with the in-phase drive signal.
[0024] In Figure 7 of the embodiments, among the electrodes in the Y5th column to be sensed, some electrodes are outside the special area 13 and some are inside the special area, which do not affect the implementation of the first scanning mode on the touch panel 10.
[0025] In an embodiment, when the number of times of executing the first scanning mode reaches a preset value or it is determined that there is no non-intentional contact object contacting the touch panel 10, return to step S10.
[0026] In Figure 6 And Figure 7 of the embodiments, it may be to sense the electrodes 11 in one column at a time until all the electrodes 11 are sensed, but the present invention is not limited thereto. In other embodiments, it may be to sense two or more columns of electrodes 11 at a time, and there are multiple columns of electrodes between the columns of electrodes to be sensed.
[0027] The scanning method in the foregoing embodiments is to sense the electrodes 11 in one column at a time, or to sense two or more columns at a time. However, in another embodiment, it may also be to sense the electrodes 11 in one row at a time, or to sense two or more rows of electrodes 11 at a time, and there are multiple rows of electrodes between the rows of electrodes to be sensed.
[0028] Those of ordinary skill in the art of touch control should understand that at least one controller drives and senses the electrodes of the touch panel 10 in the above-mentioned first, second, and third scanning modes for the touch panel.
[0029] The above are only embodiments of the present invention and do not impose any formal limitations on the present invention. Although the present invention has been provided as above by way of embodiments, it is not intended to limit the present invention. Any person of ordinary skill in the art in the relevant technical field, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments of equivalent changes. However, as long as the content does not depart from the technical solution of the present invention, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A sensing method for a touch panel, the touch panel having a plurality of independent electrodes, characterized in that: The sensing method comprises the following steps: A. determining a special area on the touch panel, wherein the special area includes a contact area of an unintentional contact object; and B. After step A, entering a first scanning mode to scan the touch panel; In the first scanning mode, the same-phase driving signal is applied to the electrode to be sensed, the electrode adjacent to it and the other electrodes outside the special area, and the same-phase driving signal is not applied to at least a portion of the electrodes in the special area.
2. The sensing method according to claim 1, characterized in that: The electrode to which the driving signal of the same phase is not applied is grounded, floated or applied with a preset voltage.
3. The sensing method according to claim 1, characterized in that: The electrodes to which the driving signals of the same phase are not applied are included in the special area and are all the electrodes except the electrode to be sensed and the electrodes adjacent to it.
4. The sensing method according to claim 1, characterized in that: It also includes performing the following steps before step A: Scanning the plurality of independent electrodes at least once in a second scanning mode to determine whether the unintentional contact object contacts the touch panel; Wherein, in the second scanning mode, the driving signal of the same phase is applied to the electrode to be sensed and the electrode adjacent to it, and the driving signal of the same phase is not applied to the other electrodes.
5. The sensing method according to claim 4, characterized in that: The method further includes performing the following steps before performing the second scanning mode: Scanning the plurality of independent electrodes multiple times in a third scanning mode to determine the position of the object; Wherein, in the third scanning mode, the driving signal with the same phase is applied to the electrode to be sensed and the other electrodes.