CN101615097A - The scan method of contact panel - Google Patents
The scan method of contact panel Download PDFInfo
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- CN101615097A CN101615097A CN200910305260A CN200910305260A CN101615097A CN 101615097 A CN101615097 A CN 101615097A CN 200910305260 A CN200910305260 A CN 200910305260A CN 200910305260 A CN200910305260 A CN 200910305260A CN 101615097 A CN101615097 A CN 101615097A
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Abstract
The present invention relates to a kind of scan method of contact panel, the particularly a kind of dynamic area scan method that can adjust scanning area according to the touching signal, this method comprises the following steps: at first, according to the pairing coordinate definition of the touching signal that is detected one scan zone; Then, the described scanning area of scanning is to detect next touching signal in during default; After during default, the sensing range of scanning contact panel is to redefine described scanning area.Because scanning area less than the sensing range of whole contact panel, therefore utilizes scanning area to detect next touching signal, can reduce sweep time and power consumption.
Description
Technical Field
The present invention relates to a scanning method of a touch panel, and more particularly, to a dynamic area scanning method capable of adjusting a scanning area according to a touch signal.
Background
With the technology changing day by day, most electronic devices, for example: electronic devices such as notebook computers, mobile phones, or portable multimedia players are usually configured with a touch panel to replace a conventional keyboard as a new generation of input interface. Touch panels are generally classified into resistive, capacitive, infrared, and ultrasonic touch panels, among which resistive touch panels and capacitive touch panels are the most common products.
The capacitive touch panel is close to or touches the touch panel through a finger or a conductor material, so that the capacitance value of the touch panel is changed. When the touch panel detects the capacitance value change, the position where the finger or the conductor material is close to or touched can be judged, and the functional operation corresponding to the touched position is executed. The capacitive touch panel has a multi-touch characteristic, and can provide a user-friendly operation, so that the capacitive touch panel is gradually favored by the market.
In a Projected Capacitive (Projected Capacitive) touch panel, all sensing areas are sequentially scanned and then a determination is made as to which sensing area is close to or touched according to the scanning result. Then, the single-point or multi-point touch position of the finger or the touch tool is calculated according to the approached or touched sensing area. Since the scanning method scans all the sensing regions, if the number of the sensing regions is too large, the scanning time of the touch panel is prolonged and the amount of computation is increased, so that the execution efficiency is greatly reduced.
Disclosure of Invention
The present invention is directed to a method for scanning a touch panel, which can effectively reduce the scanning time of the touch panel and the power consumption required for scanning.
The invention provides a scanning method of a touch panel, wherein the touch panel is provided with a plurality of sensing areas. The scanning method comprises the following steps: (a) scanning the touch panel to detect whether the sensing areas are touched; (b) when the touch signal is detected, defining a scanning area according to the coordinate corresponding to the touch signal, wherein the coordinate corresponding to the touch signal is located in the scanning area, and the scanning area is smaller than the sensing range of the touch panel; (c) scanning the scanning area to detect whether the sensing area in the scanning area is touched in a preset period; (d) after a predetermined period, returning to step (a) to rescan all sensing areas of the touch panel.
In an embodiment of the present invention, the step (b) includes: when the touch signal corresponds to a first sensing area of the sensing areas, a scanning area is defined according to the coordinates of the first sensing area.
In an embodiment of the present invention, the step (b) includes: when the touch signal corresponds to the first sensing area and the second sensing area in the sensing areas, the scanning area is defined according to the coordinates of the first sensing area and the second sensing area.
In an embodiment of the invention, the scanning area is a square area. And, the step of defining the scanning area according to the coordinates of the first sensing area and the second sensing area comprises: obtaining a first maximum coordinate value and a first minimum coordinate value in a first axial direction and a second maximum coordinate value and a second minimum coordinate value in a second axial direction according to the coordinates of the first sensing area and the second sensing area; defining a first boundary and a second boundary of the scanning area according to the first maximum coordinate value and the first minimum coordinate value; and defining a third boundary and a fourth boundary of the scanning area according to the second maximum coordinate value and the second minimum coordinate value. The first boundary and the second boundary are opposite sides, and the third boundary and the fourth boundary are opposite sides.
In an embodiment of the invention, the coordinate value of the first boundary and the maximum coordinate value differ by a default value, and the coordinate value of the second boundary and the minimum coordinate value differ by the default value.
In an embodiment of the present invention, the step (b) includes: when the touch signal corresponds to the first sensing area and the second sensing area in the sensing areas, a first sub-scanning area and a second sub-scanning area of the scanning area are respectively defined according to the coordinates of the first sensing area and the second sensing area.
In an embodiment of the invention, the first sub-scanning area and the second sub-scanning area are square areas, the first sensing area is located at a center point of the first sub-scanning area, and the second sensing area is located at a center point of the second sub-scanning area.
In an embodiment of the present invention, the step (b) includes: when the second touch signal is detected, the position of the scanning area is adjusted according to the coordinate corresponding to the second touch signal, and the coordinate corresponding to the second touch signal is located in the adjusted scanning area, wherein the second touch signal is generated after the first touch signal.
The invention further provides a scanning method of a touch panel, wherein the touch panel has a plurality of sensing areas. The scanning method comprises the following steps: (a) scanning the touch panel to detect whether the sensing areas are touched; (b) when a first touch signal is detected, defining a scanning area according to coordinates corresponding to the first touch signal, wherein when the first touch signal corresponds to a single sensing area, the scanning area is smaller than the sensing area of the touch panel, when the first touch signal corresponds to a plurality of sensing areas, the scanning area is equal to the sensing area of the touch panel, and the coordinates corresponding to the touch signal are located in the scanning area; (c) scanning the scanning area to detect whether the sensing area in the scanning area is touched in a preset period; (d) after a predetermined period, returning to step (a) to rescan all sensing areas of the touch panel.
In an embodiment of the invention, the scanning area is a square area, and the first sensing area is located at a center point of the scanning area.
In an embodiment of the invention, the touch panel is a Projected Capacitive (Projected Capacitive) touch panel.
In an embodiment of the invention, the sensing regions respectively correspond to a plurality of sensing units.
Based on the above, the invention has the advantages that the scanning mode of the full picture is replaced by the scanning mode of the dynamic area, and the system can detect the touch coordinate without scanning the whole picture every time. Therefore, the scanning time and the power consumption of the panel can be reduced, and the execution efficiency of the touch action is improved.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanying figures are described in detail below.
Drawings
Fig. 1 is a flowchart of a scanning method of a touch panel according to an embodiment of the invention.
Fig. 2 is a flowchart of a scanning method of a touch panel according to another embodiment of the invention.
Fig. 3 is a schematic diagram of a single-point touch scanning area in the embodiment of fig. 2.
Fig. 4 is a schematic diagram of the multi-touch scanning area of the embodiment of fig. 2.
Fig. 5 is a schematic diagram of another multi-touch scanning area in the embodiment of fig. 2.
Fig. 6 is a schematic diagram of another multi-touch scanning area in the embodiment of fig. 2.
Wherein,
50: touch panel
301-303, 501, 601, 602: scanning area
A. B, C, D: touched sensing area
X1-X16, Y1-Y14: coordinates of the object
S101 to S105, S201 to S204: the steps of the scanning method of the touch panel of the embodiment of the invention
Detailed Description
Fig. 1 is a flowchart of a scanning method of a touch panel according to an embodiment of the invention. Referring to fig. 1, in the present embodiment, the touch panel is, for example, a Projected Capacitive (Projected Capacitive) touch panel, the touch panel has a plurality of sensing regions, each of the sensing regions has a sensing element for sensing a touch, and the sensing element may be a sensor or a circuit structure with a sensing function. In the scanning method, first, all sensing areas on the touch panel are scanned to detect whether any sensing area is touched (step S101), wherein the touch includes both proximity and touch sensing areas. When the sensing area is touched, a touch signal is generated; otherwise, no touch signal is generated. Accordingly, whether all the sensing areas are touched can be determined according to whether the sensing areas generate the touch signal (step S102), so as to detect whether all the sensing areas on the touch panel are touched.
When a sensing area of the touch panel is touched, the touched sensing area generates a touch signal. Moreover, when the touched sensing area is scanned, a touch signal is detected, and the touch panel is determined to be in a touch state. Next, a scanning area is defined according to the coordinates of the touched sensing area (step S103), wherein the touched sensing area is located in the scanning area, and the area of the scanning area can be smaller than the area of the sensing area of the touch panel.
Then, it is determined whether a predetermined period of time has elapsed while the touch panel is in the touch state (step S104), wherein the predetermined period of time is represented by, for example, a scanning number, such as a time for scanning the touch panel ten times. Therefore, before the touch panel is kept in the touch state and the touch panel is scanned ten times, since the predetermined period does not elapse, the sensing area in the scanning area is then scanned after step S104 (step S105). Then, whether the sensing region (including the touched sensing region) in the scanning region is touched is determined according to whether the touch signal is detected (step S102). Therefore, when a user touches the touch panel, the scanning area is scanned to detect the next touched sensing area, so that the number of the scanned sensing areas can be reduced, and the scanning time is reduced.
In addition, after the touch panel is kept in the touch state and ten times of scanning is performed (i.e., ten times of scanning is performed in step S105), when the process returns to step S104, all sensing areas on the touch panel are scanned (step S101) to detect whether all sensing areas are touched, and the number of scanning times is reset to avoid misjudgment. In other words, during the predetermined period, the sensing region in the scanning region is continuously scanned (step S105), and then the scanning region is adjusted according to the scanning result (steps S102 to S103). After the predetermined period, the method returns to step S101 to re-scan all the sensing regions, and then re-define the scanning regions (steps S102 to S103). Therefore, all the sensing areas on the touch panel can be rescanned to detect whether the sensing areas outside the scanning area are touched. Because the processing speed of the existing electronic device is high, the time for scanning the touch panel once is extremely short. Therefore, when the user touches the sensing region outside the scanning region, the processing delay is not perceived by the user. When the process returns to step S102 and no touch signal is detected, it indicates that no sensing area on the touch panel is touched, and then all the sensing areas are scanned (step S101) to continuously detect whether any sensing area is touched.
Generally, when a user operates the touch panel, two or three sensing regions may be touched at a same touch point, and the touched sensing regions are still represented by the sensing regions where the mass centers of the sensed regions are located, but the embodiment is not limited to the embodiment where only one sensing region is touched at the same touch point.
In summary, in the present embodiment, when the touch signal is detected, a temporary scanning area is defined according to the touch area corresponding to the touch signal, and then only the scanning area is scanned to detect the next touched area, and the position and size of the scanning area are adjusted along with the latest detected touch point. Then, in order to avoid that a new touch point occurs in an area outside the scanning area and cannot be correctly detected, the embodiment redetects the whole picture to redefine the scanning area after a predetermined time. In other words, the scanning range of the present embodiment is switched between the whole screen and the smaller scanning area, when the scanning range is the defined scanning area, the power consumption and the required scanning time can be reduced, and when the touch point of the user has a large change, the whole screen can be scanned for detection to define a new scanning area. Therefore, the embodiment not only has the efficacy of reducing the power consumption and the scanning time, but also has the function of accurate detection, so that the system can not generate the problem of lost detection due to the reduction of the scanning range.
Fig. 2 is a flowchart of a scanning method of a touch panel according to another embodiment of the invention. Referring to fig. 1 and 2, the difference is in steps S201 to S204. When the touch panel detects that only one sensing area is touched, the touch panel is determined to be in a single-point touch state according to the detected touch signal (step S201). Next, a scanning area is defined according to the coordinates of the touched sensing area (step S202). When the touch panel detects that the sensing areas are touched, the touch panel is determined to be in a multi-touch state according to the detected touch signal (step S203). Then, a scanning area is defined according to the detected coordinates of the sensing area (step S202).
In other words, the scanning area adjusts the corresponding area according to the detected touch point, and the defined scanning areas all include the sensing area touched by the user, and the position of the scanning area is adjusted along with the newly detected touch point. In addition, no matter the touch panel is in the single-point touch state or the multi-point touch state, the touch panel of the embodiment re-detects the whole screen after a preset period, and the preset periods of the touch panel in the single-point and multi-point touch states can be counted together or respectively counted.
Next, how to define the scanning area when the touch panel is in the single-point touch is further described. Fig. 3 is a schematic diagram of a single-point touch scanning area in the embodiment of fig. 2. Referring to fig. 3, each cell of the touch panel 50 represents a sensing area for sensing whether a finger or a touch tool touches the touch panel 50, and X1 to X16 and Y1 to Y14 marked on the touch panel 50 indicate coordinates corresponding to each sensing area for convenience of description, wherein the touch panel 50 is a schematic view for illustration.
Referring to fig. 2 and 3, when the sensing area a of the touch panel 50 is touched, the sensing elements in the sensing area a generate a first touch signal. When the sensing area a is scanned, a first touch signal is detected, and the touch panel 50 is determined to be in a single-point touch state (step S201). Next, a scanning area 301 is defined according to the coordinates of the sensing area a (step S202), wherein the area of the scanning area 301 is smaller than the area of the sensing area of the touch panel 50, the sensing area a is located at the center of the scanning area 301, and the sensing area a is separated from each boundary of the scanning area 301 by a predetermined value. In the present embodiment, the default value is set as the distance between two sensing regions, i.e. the sensing regions in the square region formed by the coordinates X4-X8 and Y4-Y8 are all located in the first scanning region 301. It should be noted that the default values can be modified according to the actual configuration of the touch panel and the design requirements of those skilled in the art.
In addition, since the user may slide on the touch panel 50, the touched sensing area is changed from a to B. That is, after the user slides, the sensing area a is in an untouched state, and the sensing area B is in a touched state, wherein the change of the touched sensing area caused by the sliding operation is different from the actual situation. At this time, the second touch signal of the sensing area B is detected, the first touch signal of the sensing area a cannot be detected, and then the scanning area is adjusted according to the definition of the scanning area and the second touch signal, so that the scanning area is changed from 301 to 302. Then, the scanning area 302 is scanned to detect whether the sensing area in the scanning area 302 is touched. Similarly, if the touched sensing region is changed from B to C, the scanning region is also adjusted from 302 to 303. Therefore, when the user performs a sliding operation on the touch panel 50 (i.e., the touch panel 50 remains touched), the number of the scanning sensing regions (i.e., the scanning area) can be reduced, so as to reduce the scanning time.
Next, how to define the scanning area during multi-point touch when the touch panel is under multi-point touch is described. Fig. 4 is a schematic diagram of the multi-touch scanning area of the embodiment of fig. 2. Referring to fig. 2 and 4, when the first sensing area a and the second sensing area D of the touch panel 50 are touched, both sensing areas a and D generate touch signals. Moreover, when the sensing regions a and D are scanned, a touch signal is detected. After all the sensing areas on the touch panel 50 are scanned, the touch panel 50 is determined to be in the multi-touch state (step S203). Then, the scanning area is defined to be equal to the sensing area of the touch panel (step S204) to scan all the sensing areas. And, whether the sensing areas a and D are continuously touched and whether other sensing areas are touched are determined according to whether the touch signal is detected, so as to detect whether the user performs the sliding operation of multi-point touch or stops the touch. The number of the sensing areas of the multi-touch is used for illustration, the actual touch status varies, and the number and the arrangement of the sensing areas on the touch panel 50 vary according to the components used.
In addition, in the multi-touch state, the scanning area is not necessarily the same as the sensing range of the touch panel, and this will be described below. Fig. 5 is a schematic diagram of another multi-touch scanning area in the embodiment of fig. 2. Referring to fig. 4 and 5, the difference is the definition of the scanning area, in this embodiment, the maximum value (i.e., the first maximum coordinate value) of the coordinates in the X axis (the first axial direction) in both the sensing areas a and D is first obtained, the default value is added to the maximum value to serve as the upper boundary (i.e., the first boundary) of the scanning area 501, and the minimum value (i.e., the first minimum coordinate value) is then subtracted from the default value to serve as the lower boundary (i.e., the second boundary) of the scanning area 501. Then, the maximum value (i.e., the second maximum coordinate value) plus the default value of the coordinates in the Y axis (the second axial direction) in both of the sensing regions a and D is obtained as the right boundary of the second scanning region 501, and the minimum value (i.e., the second minimum coordinate value) plus the default value is obtained as the left boundary of the second scanning region 501. In other words, the coordinate Y11 is the upper boundary of the scan region 501, the coordinate Y4 is the lower boundary of the scan region 501, the coordinate X13 is the right boundary of the scan region 501, the coordinate X4 is the left boundary of the scan region 501, and the square region formed by the above boundaries is the scan region 501.
Note that the number of touched sensing regions may be greater than 2. At this time, the coordinates of the sensing regions in the X axis and the Y axis are compared respectively to obtain the maximum coordinate value and the minimum coordinate value of the sensing regions in the X axis and the Y axis. And, a default value is added to the maximum coordinate value, and a default value is subtracted from the minimum coordinate value, thereby defining the boundary of the scanning area.
Furthermore, the scanning area can be further subdivided into a plurality of sub-scanning areas to reduce the number of the scanning sensing areas. FIG. 6 is a schematic diagram of another multi-touch scanning area in the embodiment of FIG. 2. Referring to fig. 2 and 6, when the touch panel 50 is in a multi-touch state (step S203), a first sub-scanning area 601 and a second sub-scanning area 602 in the scanning area are defined according to a sensing area a and a sensing area D respectively (step S408), wherein the sensing area a is located in the scanning area 601 and the sensing area D is located in the scanning area 602. The definition of the scan regions 601 and 602 can refer to the description of the scan region 301, and will not be described herein. In addition, when a plurality of sub-scanning areas of the scanning area generate overlapped areas, the areas are judged to be overlapped firstly, and the overlapped areas are scanned for only one time, so that the overlapped areas are not scanned repeatedly to avoid the increase of the scanning time.
In summary, in the scanning method of the touch panel of the present invention, after the touch signal is detected, the scanning area is defined according to the touched sensing area corresponding to the touch signal. In addition, only the sensing area in the scanning area is scanned while the touch panel is kept in a touched state. Therefore, the number of the scanning sensing areas can be reduced when the touch panel is in a touch state, and the execution efficiency of touch action is improved. In addition, all the sensing areas are scanned after a preset period, so that the situation that a user touches the sensing areas outside the scanning area and cannot detect the sensing areas is avoided.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A scanning method of a touch panel is characterized in that: the touch panel is provided with a plurality of sensing areas, and the method comprises the following steps:
(a) scanning the touch panel to detect whether each sensing area is touched;
(b) when a first touch signal is detected, defining a scanning area according to coordinates corresponding to the first touch signal, wherein the coordinates corresponding to the first touch signal are located in the scanning area, and the scanning area is smaller than the sensing range of the touch panel;
(c) scanning the scanning area in a preset period to detect whether a sensing area in the scanning area is touched;
(d) after the preset period, returning to the step (a) to re-scan each sensing area of the touch panel.
2. The method of claim 1, wherein: the step of defining the scanning area according to the coordinates of the touch signal comprises:
when the touch signal corresponds to a first sensing region of the sensing regions, the scanning region is defined according to the coordinates of the first sensing region, the scanning region is a square region, and the first sensing region is located at the center point of the scanning region.
3. The method of claim 1, wherein: the step of defining the scanning area according to the coordinates of the touch signal comprises:
when the touch signal corresponds to a first sensing area and a second sensing area of the sensing areas, the scanning area is defined according to coordinates of the first sensing area and the second sensing area, and the scanning area is a square area.
4. The method of claim 3, wherein: the step of defining the scanning area according to the coordinates of the first sensing area and the second sensing area comprises:
obtaining a first maximum coordinate value and a first minimum coordinate value in a first axial direction and a second maximum coordinate value and a second minimum coordinate value in a second axial direction according to the coordinates of the first sensing area and the second sensing area;
defining a first boundary and a second boundary of the scanning area according to the first maximum coordinate value and the first minimum coordinate value, wherein the first boundary and the second boundary are opposite sides; and
defining a third boundary and a fourth boundary of the scanning area according to the second maximum coordinate value and the second minimum coordinate value, wherein the third boundary and the fourth boundary are opposite sides;
the coordinate value of the first boundary is different from the maximum coordinate value by a default value, and the coordinate value of the second boundary is different from the minimum coordinate by the default value.
5. The method of claim 1, wherein: the step of defining the scanning area according to the coordinates of the touch signal comprises:
when the touch signal corresponds to a first sensing area and a second sensing area of the sensing areas, respectively defining a first sub-scanning area and a second sub-scanning area of the scanning area according to coordinates of the first sensing area and the second sensing area; the first sub-scanning area and the second sub-scanning area are square areas, the first sensing area is located at the center point of the first sub-scanning area, and the second sensing area is located at the center point of the second sub-scanning area.
6. The method of claim 1, wherein: the step of defining the scanning area according to the coordinates of the touch signal comprises:
when a second touch signal is detected, adjusting the position of the scanning area according to the coordinate corresponding to the second touch signal, wherein the coordinate corresponding to the second touch signal is located in the adjusted scanning area, and the second touch signal is generated after the first touch signal.
7. The method according to claim 1, wherein each of the sensing regions comprises a sensing element.
8. A scanning method of a touch panel is characterized in that: the touch panel is provided with a plurality of sensing areas, and the method comprises the following steps:
(a) scanning the touch panel to detect whether each sensing area is touched;
(b) when a first touch signal is detected, defining a scanning area according to coordinates corresponding to the first touch signal, wherein when the first touch signal corresponds to a single sensing area, the scanning area is smaller than the sensing range of the touch panel, and when the first touch signal corresponds to a plurality of sensing areas, the scanning area is equal to the sensing range of the touch panel, wherein the coordinates corresponding to the touch signal are located in the scanning area;
(c) scanning the scanning area in a preset period to detect whether a sensing area in the scanning area is touched; and
(d) after the preset period, returning to the step (a) to re-scan each sensing area of the touch panel.
9. The method of claim 8, wherein: the scanning area is a square area, and the first sensing area is located at the center point of the scanning area.
10. The method of claim 8, wherein: each sensing area comprises a sensing component.
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