CN109284017B - Method and device for determining whether a line segment corresponds to a stylus tip or a conductive object - Google Patents

Abstract

The invention relates to a method and a device for judging whether a line segment corresponds to a pen point of a touch pen, comprising the following steps: obtaining a plurality of touch signal values corresponding to the line segment range; calculating a first slope of the line segment range edge; judging whether the first slope is larger than a slope critical value; when the first slope is larger than the slope critical value, the line segment is determined to correspond to the touch pen point. The method and the device for judging whether the line segment corresponds to the pen point of the touch pen can reduce or even avoid that an error proximity event is reported to a host computer so as to generate an instruction which is not wanted by a user.

Description

Method and device for determining whether a line segment corresponds to a stylus tip or a conductive object

This application is a divisional application for an invention patent application with application number 201410737946.6 entitled "Method and Apparatus for Judging Error Proximity Events". The application date of the original application is December 5, 2014.

technical field

The present invention relates to detecting proximity events on a touch screen, especially to judging false proximity events caused by ghost spots or water stains.

Background technique

When detecting proximity events that occur on a touch screen, false proximity events due to ghost spots or water spots may be detected. Proximity events generated by these errors may cause the user to issue incorrect instructions with irreversible results. Therefore, there is an urgent need for a method and an apparatus capable of judging an erroneous approach event to avoid the above-mentioned consequences.

In view of the defects of the above-mentioned existing methods and devices for judging errors and approaching events, the inventor of the present invention actively conducts research and innovation based on years of rich practical experience and professional knowledge in the design and manufacture of such products, and cooperates with the application of theories, in order to create A new method and device for judging an erroneous proximity event can improve the general existing method and device for judging an erroneous proximity event, making it more practical. After continuous research, design, and repeated trial production of samples and improvements, the invention with practical value was finally created.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to overcome the defects existing in the existing method for judging error proximity events, and provide a new method for judging error proximity events. The technical problem to be solved is to make it obtain one or more corresponding line segment ranges. touch signal value; calculate the sum of the difference between each touch signal value and the reference value; and when the sum is less than or equal to zero, it is considered that the line segment range corresponds to an erroneous proximity event, which is very suitable for practical use.

Another object of the present invention is to provide a novel device for judging an erroneous proximity event, and the technical problem to be solved is that it is used to perform the above steps, so that it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. A method for judging an erroneous proximity event according to the present invention includes the following steps: obtaining one or more touch signal values corresponding to a line segment range; calculating the sum of the difference between each touch signal value and a reference value; and When the sum is less than or equal to zero, the line segment range is considered to correspond to a false proximity event.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned method for judging an erroneous proximity event further includes the following step: calculating the range of the line segment according to the one-dimensional sensing information including the double difference value of the touch signal value.

The aforementioned method for judging an erroneous proximity event further includes the following steps: calculating the one-dimensional sensing information including the double difference of the touch signal value according to the one-dimensional sensing information including the difference value of the touch signal value .

The aforementioned method for judging an erroneous proximity event further includes the following steps: obtaining the one-dimensional sensing information including the difference value of the touch signal value according to the one-dimensional sensing information including the touch signal value.

The aforementioned method for judging an erroneous proximity event further includes the following steps: when the sum is greater than zero, calculating the proximity event corresponding to the range of the line segment.

The purpose of the present invention and the technical problem to be solved are further achieved by the following technical solutions. A device for judging a false proximity event according to the present invention is used to perform the following steps: obtaining one or more touch signal values corresponding to a line segment range; calculating the sum of the difference between each touch signal value and a reference value ; and when the sum is less than or equal to zero, the line segment range is considered to correspond to an erroneous proximity event.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

The aforementioned device is further used for: calculating the range of the line segment according to the one-dimensional sensing information including the double difference value of the touch signal value.

The aforementioned device is further used for: calculating the one-dimensional sensing information including the double difference value of the touch signal value according to the one-dimensional sensing information including the difference value of the touch signal value.

The aforementioned device is further used for: obtaining the one-dimensional sensing information including the difference value of the touch signal value according to the one-dimensional sensing information including the touch signal value.

The aforementioned device is further used for: when the sum is greater than zero, calculating the proximity event corresponding to the range of the line segment.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. With the above technical solutions, the method and device for judging erroneous proximity events provided by the present invention can reduce or even avoid erroneous proximity events being reported to the host, so that commands that are not intended by the user are generated.

The above description is only an overview of the technical solution of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand , the following specific preferred embodiments, and in conjunction with the accompanying drawings, are described in detail as follows.

Description of drawings

FIG. 1 is a schematic diagram of a signal value, a difference value, and a double difference value according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an area enclosed by a signal value and a reference value according to an embodiment of the present invention.

3 is a schematic diagram of a signal value, a double difference value, and a line segment presented by a finger sliding over the conductive liquid according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of signal values and line segments presented when ghost points are formed by multiple fingers according to an embodiment of the present invention.

5A is a schematic diagram of signal values exhibited by a pen tip and a large conductive object according to an embodiment of the present invention.

5B is a schematic diagram of signal values exhibited by a pen tip and a large conductive object according to an embodiment of the present invention.

5C is a schematic diagram of signal values exhibited by a pen tip and a large conductive object according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of judging a palm range from a line segment group according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of preventing a line segment group with multiple fingers from being misjudged as a palm according to an embodiment of the present invention.

FIG. 8 is a schematic flowchart of a method for judging a false proximity event according to an embodiment of the present invention.

FIG. 9 is a partial block diagram of a touch control system according to an embodiment of the present invention.

10A to 10D are schematic flowcharts of determining whether a line segment corresponds to a tip of a stylus according to various embodiments of the present invention.

11A to 11D are schematic flowcharts of determining whether a line segment corresponds to a suspended conductive object according to various embodiments of the present invention.

FIG. 12 is a schematic flowchart of excluding a line segment group corresponding to a palm according to an embodiment of the present invention.

13 is a schematic flowchart of a method for judging a palm line segment group according to an embodiment of the present invention.

【Description of main component symbols】

14: Signal value

15: Difference

16: Double difference

810-880: Procedure

900: Touch System

910: Approaching Objects

920: Touch Panel

921: First Electrode

922: Second Electrode

930: Touch Processing Device

940: host

1010-1050: Steps

1110-1150: Procedure

1210-1280: Steps

1310-1340: Steps

Detailed ways

Some embodiments of the present invention will be described in detail as follows. However, other than the disclosed embodiments, the scope of the present invention is not limited by the described embodiments, but by the claims. In order to provide a clearer description and enable those skilled in the art to understand the content of the present invention, the various parts in the drawings are not drawn according to their relative dimensions, and some dimensions or other relative dimensions may be highlighted. It is exaggerated when it comes out, and the irrelevant details are not completely drawn, in order to keep the illustration concise.

For convenience, simple term definitions are provided below, but the scope of the present invention includes, but is not limited to, the following definitions.

Touch panel/screen: a sensing layer is formed on the substrate, and the control device can use the sensing layer to detect the position of at least one conductive object approaching or contacting the substrate. The sensing layer can be a single-layer or multi-layer structure.

Proximity: A general term for approaching or touching.

External conductive objects: can be parts of the human body, such as fingers or palms. It can be an object that interfaces with the human body, such as a passive stylus. It can be an active stylus that sends a signal to the touch panel to detect the position. It can also be a grounded conductive object for testing, such as a copper cylinder. It may also be water or conductive liquid stuck on the surface of the touch panel.

Proximity Objects: External conductive objects near or in contact with the substrate.

Proximity event: when an external conductive object approaches or contacts the substrate, the touch panel detects the event of the external conductive object.

Sensing layer: including multiple (m) drive electrodes parallel to the first axis and multiple (n) sensing electrodes parallel to the second axis, the drive electrodes and the sensing electrodes are exposed to each other, forming m times n sensing point. The first axis and the second axis may be orthogonal, and m may be equal to n.

Driving electrode (first conductive strip): including a plurality of (m strips) electrodes parallel to the first axis for emitting driving waves, which can be made of transparent or opaque materials, such as indium tin oxide (ITO) or nanometer Carbon tubes can have a single-layer structure or a double-layer structure.

Sensing electrodes (second conductive strips): electrodes used to detect capacitive signals, which can be made of transparent or opaque materials, such as indium tin oxide or carbon nanotubes, which can be single-layered or double-layered structure.

One-dimensional sensing information: a plurality of sensing information corresponding to the first axis or the second axis. It can refer to the set of signal values of m sensing points where a single sensing electrode corresponds to m driving electrodes, or it can refer to the set of signal values of n sensing points where a single driving electrode corresponds to n sensing electrodes . In other words, the one-dimensional sensing information may include signal values of m sensing points, or may include signal values of n sensing points. The one-dimensional sensing information may also include single-difference values and double-difference values of m/n sensing points.

Two-dimensional sensing information: sensing information composed of multiple one-dimensional sensing information, or called an image.

Baseline (baseline or stray): The signal value corresponding to a certain operating frequency.

Signal value: It can be the signal directly detected by the sensing electrode, or the signal value restored by the single difference value and the reference value. Although the two are different, they can be used interchangeably in some embodiments.

Single difference value (or called difference value): The difference value of the signal values of adjacent sensing points.

Double Difference: The difference between adjacent differences.

Line segment: All or a continuous part of one-dimensional sensing information.

Line segment group: a plurality of line segments corresponding to adjacent one-dimensional sensing information, and at least one sensing point in the adjacent axial direction is corresponding.

Ghost Point: A point or area corresponding to unwanted capacitive sensing.

The actions of the touch panel/screen can be divided into three procedures. One is the full-screen drive detection procedure. By simultaneously providing drive signals to all the drive electrodes, it can be determined whether there is at least one approaching object. The second is the external noise detection program, which can judge whether the external electromagnetic interference is serious by stopping supplying the driving signal to all the driving electrodes. The third is a point reporting program, by sequentially providing driving signals to each driving electrode, and reporting touch points and/or related information to other software or hardware modules by the signal values detected or read by each sensing electrode. .

In an embodiment, the execution sequence of the above three procedures can be performed first by executing the full-screen drive detection procedure to determine that there is no external conductive object on the touch panel/screen. Then, the external noise detection procedure is executed to determine that the external electromagnetic interference is not serious, or to set a new operating frequency of the driving signal. Finally, execute the reporting procedure again.

After the point reporting procedure in the embodiment, the above-mentioned cycle may be repeated.

In another embodiment, after repeating the point reporting procedure for many times, the external noise detection procedure can be performed once, and then the point reporting procedure and the external noise detection procedure are repeated several times. After repeating the external noise detection procedure several times, execute the full-screen driver detection procedure.

Those of ordinary skill in the art can understand that the execution of the above three programs can have infinite combinations, and the present invention is not limited to a certain combination. The order in which the programs are executed can be determined in advance, or it can be temporarily changed according to the situation encountered, or it can be temporarily decided to execute a certain program.

Generally speaking, the purpose of the reporting procedure is to detect the brushstrokes and/or fingertips close to the touch panel/screen, and to exclude the palm, water (the comprehensive representative of conductive liquid, and water will be used as a proxy in the future), Or unnecessary capacitive sensing. The point reporting procedure can further include and subdivide into the following steps: scan or detect all the sensing points; correct the electrical characteristics of the sensing electrodes and the curvature of the substrate; find each line segment corresponding to the above-mentioned objects; check each Line segments to exclude water and ghost points; grouping qualified line segments to exclude palms; positioning brushstrokes and/or fingertips; tracking positioning or tracing; positioning and reporting points. Although the reporting procedure can include the above steps, not every step is necessary, and some steps can be skipped.

Generally speaking, the processing module of the touch panel/screen can obtain m pieces of one-dimensional sensing information measured by each sensing electrode, and each piece of one-dimensional sensing information includes n sensing points corresponding to each driving electrode Information. The processing module may directly obtain the signal value, or may directly obtain the difference value. When the signal value is obtained, the difference value can be calculated. When the difference value is obtained, the signal value can also be pushed back and forth via the reference value. And whether the one-dimensional sensing information of the signal value or the difference value is obtained, the double difference value can be further calculated.

As shown in FIG. 1 , the uppermost curve 14 is the signal value. The middle curve 15 is the difference. The lowermost curve 16 is a double difference.

In an optional step, due to the electrical characteristics of the sensing electrodes, the signal values measured at each sensing point are deviated, and the signal values may be corrected for this deviation. In addition, since the substrate may be bent due to the proximity event, the substrate itself may also have deformation, and the influence of the substrate deformation can also be corrected.

The step of finding the line segment using the one-dimensional sensing information may include finding the range of the line segment using the double difference value, the difference value, and/or the signal value. After the double difference value is obtained, there are several ways to extract the line segment.

In an embodiment, a high point above the double-difference threshold may be found first. Then find a relative low point forward, called the first point (front point), and then find a relative low point backward, called the second point (back point), then the range of the line segment is from the first point to Second point. For example, for one-dimensional sensing information with n sensing points, the relative high point is found at the 20th point, the relative low point found forward is the 15th point, and the relative low point found backward is the 25th point. Then the range of the line segment is from the 15th point to the 25th point, and the length of the line segment is 11.

But in some instances, no relative lows were found within a range forward or backward. When this happens, define a certain distance forward or backward as the range of the line segment. For example, the above distance is set to 5. Then, when the relative high point (point 20) cannot find a relative low point afterward, the 25th point is defined as the second point. The range of the line segment is from point 15 to point 25, and the length of the line segment is 11. vice versa.

In the above-mentioned embodiments, it is suitable to have line segments higher than the double difference threshold value. However, when some proximity events occur, a single double difference value higher than the double difference threshold value will not be generated, but a relatively flat double difference value curve will be generated. For example, when a slender stylus tip or a pencil tip makes contact, it may not produce a single double difference above the double difference threshold. Therefore, if you need to detect this type of approaching objects, you can use the following method of extracting line segments.

You can first find two consecutive positive double difference values, sum them up and compare them with the aforementioned double difference threshold value. If the sum is higher than the double difference threshold value, it can also be called a relative high point. Then, similarly find a relative low point forward, called the first point (front point), and then find a relative low point backward, called the second point (back point), then the range of the line segment is from the first point One point to the second point. Similarly, when a relative low point cannot be found within a range forward or backward, a certain distance forward or backward is defined as the range of the line segment.

For example, suppose the double difference threshold value is 5, and a series of double difference values is [0,0,0,-1,-3,-1,1,3,3,1,-1,-3, -1,0,0,0]. In the above line segment, the first two positive double difference values are 1,3, but their sum is less than the double difference threshold value. Then, you can find two consecutive parts with a value of 3. Since their sum is 6, which is greater than the double-difference threshold above, these two values are considered relatively high. Then go back and forth to find the first and second points.

It is worth noting that the second method of comparing the sum of the two positive double differences with the threshold value can also be applied to the case where there is a single value greater than the threshold value.

After finding all the line segments on the touch panel/screen, start checking the line segments. The way the line segment is checked can be used to exclude water and ghost spots. A combination of double difference values, difference values, and/or signal values may be used here to make the determination.

After the line segment is found by using the double difference value, the difference value and the signal value corresponding to the line segment can be known. The area sandwiched between the signal value and the reference value can be calculated. As shown in Figure 2, when the area is below the reference value, it is called a negative value, which is usually caused by water or ghost spots. Therefore, when the signal value area of the line segment is negative, the line segment can be discarded or ignored.

Please refer to Figure 3. In some cases, the fingertip can also be detected when there is a large water stain on the touch panel and the fingertip runs over the water stain. Three line segments can be cut out from the double difference part according to the above method of finding line segments. From left to right are LPC1, LPC2, and LPC3.

When the three line segments are restored to the signal value, it can be seen that the area corresponding to LPC1 is negative, the area corresponding to LPC3 is also negative, and only the area corresponding to LPC2 is positive. Therefore, LPC1 and LPC3 are discarded or ignored at this stage, leaving LPC2.

Referring to Figure 4, in some cases ghosting occurs. Let's say there are four proximity events happening at the same time in the touch area. Since the current will flow from one proximity object to another proximity object, for example, from one finger of the same palm to another finger, and then back into the sensing electrodes, ghost dots are generated. These ghost points are detected in double difference, where the two proximity events are on the same axis as the two ghost points.

In the line segment extraction step, in addition to LPC1 and LPC5 corresponding to the two proximate objects respectively, there are also two line segments corresponding to the two ghost points LPC2 and LPC4 respectively. However, between the two ghost points, a line segment LPC3 may also be detected. When detecting the signal value area of each line segment, it is found that the signal value area of LPC1 and LPC5 is positive, while the remaining LPC2, LPC3, and LPC4 are negative values, so LPC2, LPC3, and LPC4 can be discarded or ignored, leaving only LPC1 and LPC5.

Referring to Figure 5A, in some cases there may be undesired proximity events. On the right side of the figure is a pen tip contact with a small contact area and a small amount of signal change. On the left side of the diagram are large conductive objects, such as copper pillars with good conductivity. When the copper pillar is still some distance away from the touch panel/screen, it has already begun to affect the sensing electrodes. Both proximity events will be found when capturing the line segment, but the touch panel should not report the proximity event on the left.

Therefore, when examining its signal value, it is possible to examine the slope of the signal value at the edge of the line segment, as well as the area of the line segment, or the area in terms of length. The area 2 (Area 2) of the pen tip is relatively small, but the slope 2 (Slope 2) of the edge of the line segment is relatively large. The area 1A (Area 1A) of the left proximity event is larger, but the slope 1A (Slope1A) of the line segment edge is smaller. Therefore, the slope and area can be used to filter out the line segment corresponding to the left proximity event to filter out unnecessary proximity events.

Referring to FIG. 5B , the large conductive object on the left side of the figure is closer to the touch panel than that of FIG. 5A . Likewise, the touch panel also filters out proximity events on the left. Therefore, the test method of FIG. 5A is applied to test the slope of the signal value at the edge of the line segment, and the area of the line segment, or the area represented by the length. The area 2 of the nib is relatively small, but the slope 2 of the edge of its line segment is relatively large. On the other hand, the area 1B (Area 1B) of the left approach event is larger, but the slope 1B (Slope 1B) of the line segment edge is smaller. Although the area 1B of FIG. 5B is larger than the area 1A of FIG. 5A and the resulting signal value is also larger, the slopes 1B and 1A of the edges of these two line segments are both smaller than the slope 2 caused by the pen tip. Therefore, the slope and area can be used to filter out the line segment corresponding to the left proximity event to filter out unnecessary proximity events.

Please refer to FIG. 5C . Compared with FIG. 5A and FIG. 5B , the large conductive object on the left has contacted the touch panel, and the signal value caused by it will be much larger than the signal value corresponding to the pen tip. Therefore, the slope 1C (Slope 1C) of the corresponding line segment edge is also greater than the slopes 1A and 1B of the previously untouched touch panel. And its area 1C (Area 1C) will also be larger than 1A and 1B that have not touched the touch panel before. Therefore, when the proximity events on the left side of Figures 5A and 5B are removed using the slope and area filter, the proximity events on the left side of Figure 5C are not removed.

After detecting all the line segments, and discarding or ignoring some line segments caused by water, ghost points, or unnecessary proximity events, the next step is to assemble each line segment into a line segment group in order to find the centroid of the proximity event, And remove the part that the palm touches.

Referring to FIG. 6 , after finding all the line segments, the adjacent line segments in the vertical part can be combined into a line segment group. Four line segment groups can be seen in Figure 6, of which the fourth group (Group4) is the proximity event due to the palm. The second group (Group2) and the third group (Group3) are the proximity events caused by the contact of fingers that do not operate the touch panel, and should also be counted in the palm part. Only the first group (Group1) is the proximity event caused by the fingertip or pen tip that actually operates the touch panel. In other words, the touch panel/screen should classify the second group, the third group, and the fourth group as the palm part, and only report points for the first group.

In an embodiment, when a certain line segment group has one of the following conditions or any combination thereof, the line segment group is considered to be a palm. The first condition is that a certain signal value of a certain line segment in the line segment group is higher than the threshold value of the palm signal, then the line segment group is considered to be the palm. The second condition is when the length of a certain line segment in the line segment group is greater than the threshold value of the palm length. The third condition is when the number of line segments in the line segment group is greater than the threshold value of the number of palm line segments. The threshold value of the palm length may be equal to the threshold value of the number of palm line segments, or it may not be equal.

As long as any line segment group is considered to be the palm line segment group, the step of merging other line segment groups can be performed. In FIG. 6 , each line segment of the fourth group can extend outward in both the horizontal direction and the vertical direction. After extending a horizontal distance, if it touches other line segment groups, the touched line segment group will also be regarded as a palm line segment group. For example, the second and third groups are both within the horizontal extension of the fourth group, so both line segments will be classified as palm line segments. The first group is obviously far away from the fourth group and is not extended and touched by the fourth group, so the first group will not be classified as a palm line segment group.

In the vertical part, the line segment group of the edge is extended upward and downward, and the length of the extended line segment group is the same as or proportional to the length of the edge line segment group. For example, the length of the first extension segment can be 80% of the edge segment group, the length of the second extension segment can be 80% of the length of the first extension segment, and so on, until the number of extension segments reaches the upper limit, or the extension The length of the line segment falls below the lower limit. In Figure 6, none of the vertically extending line segments of the fourth group touch other line segment groups.

It should be noted that the above extension can be limited to only one time, that is, the fourth group of the line segment group originally considered to be the palm is extended, and the second and third groups do not need to be extended. However, the present invention can also extend the extended line segment group again, but its horizontal distance may be shorter than the original extended horizontal distance, and the number or proportion of its vertical extension may also be larger than the original number or proportion of extension Come less. In another example, the re-extension conditions can also be set to be the same as the original extension conditions.

In another embodiment, the original palm line segment group may be framed into a palm rectangle, and then an enlarged palm rectangle may be framed according to the above-mentioned extension spirit. If another line segment group overlaps with the enlarged palm rectangle, it is regarded as a palm line segment group.

Although the method of expanding the palm rectangle is simpler in operation than the previous method, it is easy to frame more area. If there is an approach event that you want to report within the range of the enlarged palm rectangle, the corresponding line segment group will be ignored. Therefore, under the condition that computing resources permit, the former method of external expansion is better.

During actual writing, the contact area changes rapidly due to the constant movement of the palm and fingertips. There are times when the contacting part of the palm splits into many separate smaller areas that have no way of being seen as a palm. Therefore, when it is determined that a palm line segment group appears in a certain detection scan, a palm flag and/or a time stamp can be set.

During the palm flag setting period, the above three conditions can be relaxed. For example, the threshold of palm signal can be reduced, the threshold of palm length can be shortened, and the threshold of the number of palm line segments can also be shortened. Therefore, a certain line segment group can be judged as a palm line segment group with a high probability. In an embodiment, the above-mentioned widened area may be limited to an enlarged palm rectangle or an enlarged palm shape. The three conditions for relaxation can only be applied to the line segment group that overlaps the rectangle or shape of the enlarged palm. When the palm line segment group cannot be determined, it can be checked whether the timestamp has expired. The palm flag can be cleared when the timestamp has exceeded the threshold.

The present invention is not limited to the above-mentioned method of setting the palm flag and/or time stamp. As long as it is judged that a palm has appeared before, the conditions for identifying the palm can be relaxed, and the present invention can be applied.

In some cases, due to the close proximity of the close objects, special methods are required to disassemble the line segment group. Referring to FIG. 7 , in the case where four fingers are in parallel, according to the above three conditions, the line segments corresponding to the four fingertips will be combined into a line segment group. Since the number of the line segment group is greater than the threshold of the number of palm line segments, it will be regarded as the palm line segment group and will be ignored.

In order to avoid this situation, the palm line segment group can be analyzed, and when its total area (that is, the sum of the lengths of each line segment) is smaller than its corresponding normal palm area, the dismantling step is performed. Alternatively, when the length of each line segment of the palm line segment group shows a sudden change in the vertical direction, the disassembly step can also be performed. When disassembling, it can be seen that the signal value of the interval part of each fingertip is very small, so it can be disassembled into four line segment groups, and each line segment group corresponds to a fingertip. Also because it is disassembled into four line segment groups, the original line segment group will not be regarded as the palm line segment group. Therefore, the proximity events corresponding to the four line segment groups will be reported.

Another thing that needs special treatment is the line segment group of the pen tip. In some embodiments, for example, when the line spacing of the sensing electrodes is about 4 mm, and the diameter of the pen tip is about 1.5-2 mm, there are only two possibilities for the corresponding line segments. A larger probability would correspond to a single short line segment, while a smaller probability would correspond to a group of line segments consisting of two adjacent line segments, which are about the same length, but also quite short in length.

Therefore, when a single line segment is detected, it can be determined whether it is a pen tip. As mentioned earlier, the condition for judging the pen tip may include judging the slope of the signal value of the edge of the line segment. When it is determined to be a pen tip, a pen tip flag and/or time stamp corresponding to the pen tip can be set.

Assuming that in the next scan and detection, when it is found that the characteristics of the line segment group are similar to the pen tip, it is determined whether the above-mentioned pen tip flag has been set. If it has been set, it can be determined that the line segment group is the tip of the pen, and the point must be reported. Otherwise, the line segment group is ignored. Since the pen tip comes into contact with the control panel/screen for the first time, there is only a small probability that it will appear in the form of a group of line segments. As long as it moves a little, it will almost certainly appear in the form of a single line segment, so it will not affect the user's performance. feel.

Timestamps can be used for comparison, and the nib flag can be cleared some time after the nib's trace disappears. It is worth noting that if multiple nibs are allowed to touch the touch panel/screen at the same time, the above-mentioned nib flag needs to correspond to the tracing of a certain nib.

After the point reporting procedure, positioning according to the line segment group; tracking positioning or tracing; and the steps of positioning and reporting points.

Please refer to FIG. 8 , which is a schematic flowchart of a method for judging an erroneous proximity event according to an embodiment of the present invention. In FIG. 8 , except for steps having a causal relationship, the present invention does not limit the order in which the steps are performed, nor does it limit the insertion of other steps between the steps. In addition, reference may also be made to the embodiments of FIGS. 2 to 4 .

In an embodiment, the process of the method may start from step 810, receiving one-dimensional sensing information including touch signal values, and calculating the embedded touch signals according to the one-dimensional sensing information including touch signal values One-dimensional sensing information of the difference of values. Next, step 820 is performed.

In another embodiment, the process of the method may start from step 820, and calculate the one-dimensional sensing information including the double difference value of the touch signal value according to the one-dimensional sensing information including the difference value of the touch signal value information. Next, step 830 is performed.

In another embodiment, the process of the method may start from step 830, and calculate the line segment range according to the one-dimensional sensing information including the double difference value of the touch signal value. Next, step 840 is performed. In the foregoing paragraphs, how to calculate the line segment range according to the double difference has been described, so it is not repeated here.

It is worth noting that, when the chip or device implementing the method embodiment of FIG. 8 receives one-dimensional sensing information, it can receive the touch signal value, the difference value of the touch signal value, and the touch signal. Double difference of values. The present invention does not limit which value is received, as long as the line segment range can be calculated according to the one-dimensional sensing information.

Step 840 is used to obtain one or more touch signal values corresponding to the line segment range. As mentioned above, the present invention does not limit which value is received, but in step 840, the touch signal value corresponding to the line segment range must be obtained. For example, when the chip or device implementing the method embodiment of FIG. 8 receives a double difference value, the difference value can be restored first, and then the touch signal value can be restored. When the chip or device implementing the method embodiment of FIG. 8 receives the difference value, the touch signal value can be restored. When the chip or device implementing the method embodiment of FIG. 8 receives touch signal values, the segment of touch signal values corresponding to the line segment range can be cut out.

Step 850 is used to calculate the sum of the difference between each touch signal value and the reference value. In other words, the area enclosed by the touch signal value corresponding to the line segment range and the reference value is calculated.

Next, in step 860, it is determined whether the sum or area is less than or equal to zero. In an embodiment, it can also be determined whether the sum or area is less than zero. If so, the flow goes to step 870, where it is considered that the line segment range corresponds to an erroneous proximity event, possibly caused by ghost points or water spots. For example, the one-dimensional sensing information corresponding to the line segment range can be discarded without further calculation of the proximity event. If the determination result of step 860 is no, the flow proceeds to step 880 to calculate the proximity event corresponding to the line segment range.

Please refer to FIG. 9 , which is a schematic diagram of a touch control system 900 according to an embodiment of the present invention. The touch system 900 includes at least a proximity object 910 , a touch panel 920 , a touch processing device 930 and a host 940 . In this embodiment, the above-mentioned touch panel 920 is formed on the substrate. The touch panel 920 may be a touch screen, and the present invention does not limit the form of the touch panel 920 .

In an embodiment, the touch area of the touch panel 920 includes a plurality of first electrodes 921 and a plurality of second electrodes 922, and a plurality of sensing points are formed where the two overlap. The first electrodes 921 and the second electrodes 922 are respectively connected to the touch processing device 930 . In the mutual capacitance detection mode, the first electrode 921 can be referred to as a first conductive strip or a driving electrode, and the second electrode 922 can be referred to as a second conductive strip or a sensing electrode. The touch processing device 930 can provide the driving voltage (the voltage of the driving signal) to the first electrode 921 and measure the signal change of the second electrode 922 to know that there is an external conductive object approaching or contacting (referred to as proximity for short). ) the touch panel 920. Those skilled in the art can understand that the above-mentioned touch processing device 930 can detect proximity events and proximity objects by means of mutual capacitance or self-capacitance, which will not be described in detail here.

Also included in FIG. 9 is a host 940, which may be a central processing unit that executes an operating system or the like, or a main processor in an embedded system, or other forms of computers. In an embodiment, the touch control system 900 may be a tablet computer, and the host 940 may be a central processing unit executing an operating system of the tablet computer. For example, the tablet computer executes an Android (Android) operating system, and the host 940 is an ARM (ARM) processor that executes the Android operating system. The present invention does not limit the form of information transmitted between the host 940 and the touch processing device 930 , as long as the transmitted information is related to a proximity event occurring on the touch panel 920 .

The touch processing device 930 shown in FIG. 9 can be used to execute the flowchart of the method shown in FIG. 8 and all possible variations thereof. The touch processing device 930 may include or be connected to a memory for storing executed software, firmware, touch signal values, their differences, their double differences, and other calculation results or intermediate values.

To sum up, the method and apparatus for judging erroneous proximity events provided by the present invention can reduce or even avoid erroneous proximity events being reported to the host, so that commands that are not intended by the user are generated.

Please refer to FIG. 10A , which is a schematic flowchart of determining whether a line segment corresponds to the tip of a stylus according to an embodiment of the present invention. The touch processing device 930 shown in FIG. 9 can be used to execute the flowchart of the method shown in FIG. 10A and all possible variations thereof. The touch processing device 930 may include or be connected to a memory for storing executed software, firmware, touch signal values, their differences, their double differences, and other calculation results or intermediate values. In FIG. 10A , except for steps having a causal relationship, the present invention does not limit the order in which the steps are performed, nor does it limit the insertion of other steps between the steps. In addition, the embodiment of FIG. 10A may also refer to the embodiment of FIG. 5A , FIG. 5B , FIG. 5C , and FIG. 8 .

In an embodiment, the touch signal value corresponding to the line segment and the line segment can be obtained as in steps 810 to 840 in the embodiment of FIG. 8 . Next, step 1010 is executed to calculate the first slope of the edge of the line segment. The first slope referred to here may be the slope of the left edge of the line segment or the slope of the right edge of the line segment. In an example, when the first slope is the slope of the left edge of the line segment, the first relative high point can be found from the far left of the line segment to the right, and then the first relative high point from the left edge of the line segment to the first relative high point can be calculated. slope. In another example, when the first slope is the slope of the right edge of the line segment, the first relative high point can be found from the far right side of the line segment to the left, and then the distance from the right edge of the line segment to the first relative high point can be calculated. first slope. In addition, other slope calculation methods can also be used. For example, the slope value of a certain range of the edge of the line segment can be directly calculated as the above-mentioned first slope.

After the first slope is calculated, step 1020 may be continued to determine whether the first slope is greater than a slope threshold. When the determination result is no, step 1050 is executed to determine that the line segment does not correspond to the tip of the stylus, or is not a small-area contact event of any external conductive object. When the determination result is true, optional step 1030 may be performed, or step 1040 may be directly performed to determine that the line segment corresponds to the tip of the stylus, or a small area contact event of any external conductive object.

In optional step 1030, it is determined whether the length of the line segment is less than a length threshold. When the determination result is no, step 1050 is executed to determine that the line segment does not correspond to the tip of the stylus, or is not a small-area contact event of any external conductive object. When the determination result is true, step 1040 is executed to determine that the line segment corresponds to the tip of the stylus, or a small-area contact event of any external conductive object.

Please refer to FIG. 10B , which is a schematic flowchart of determining whether a line segment corresponds to a tip of a stylus according to an embodiment of the present invention. Compared with the embodiment of FIG. 10A , the embodiment of FIG. 10B continues steps 1030 , 1040 , and 1050 . In the initial step 1015, in addition to the first slope, a second slope is also calculated. In other words, the slopes of the left and right edges of the line segment are calculated. When the first slope represents the slope of the left edge of the line segment, the second slope represents the slope of the right edge of the line segment. Conversely, when the first slope represents the slope of the right edge of the line segment, the second slope represents the slope of the left edge of the line segment.

Next, in step 1025, it is determined whether the first slope and the second slope are both greater than a slope threshold. When the determination result is no, step 1050 is executed to determine that the line segment does not correspond to the tip of the stylus, or is not a small-area contact event of any external conductive object. When the determination result is true, optional step 1030 may be performed, or step 1040 may be directly performed to determine that the line segment corresponds to the tip of the stylus, or a small area contact event of any external conductive object.

Please refer to FIG. 10C , which is a schematic flowchart of determining whether a line segment corresponds to a tip of a stylus according to an embodiment of the present invention. Compared with the embodiment of FIG. 10A , the embodiment of FIG. 10C uses all the steps, but in a different order. Initially, step 1030 is performed. When the judgment result is no, step 1050 is executed; otherwise, when the judgment result is true, optional step 1010 or 1040 is executed. After the optional step 1010 is performed, step 1020 is then performed. When the judgment result is no, step 1050 is executed; otherwise, when the judgment result is true, step 1040 is executed.

Please refer to FIG. 10D , which is a schematic flowchart of determining whether a line segment corresponds to the tip of a stylus according to an embodiment of the present invention. Compared with the embodiment of FIG. 10C , the embodiment of FIG. 10D replaces steps 1010 and 1020 with the aforementioned steps 1015 and 1025 respectively. Initially, step 1030 is performed. When the judgment result is no, step 1050 is executed; otherwise, when the judgment result is true, optional step 1015 or 1040 is executed. After the optional step 1015 is performed, step 1025 is then performed. When the judgment result is no, step 1050 is executed; otherwise, when the judgment result is true, step 1040 is executed.

Please refer to FIG. 11A , which is a schematic flowchart of determining whether a line segment corresponds to a suspended conductive object according to an embodiment of the present invention. The touch processing device 930 shown in FIG. 9 can be used to execute the flowchart of the method shown in FIG. 11A and all possible variations thereof. The touch processing device 930 may include or be connected to a memory for storing executed software, firmware, touch signal values, their differences, their double differences, and other calculation results or intermediate values. In FIG. 11A , except for steps having a causal relationship, the present invention does not limit the order in which the steps are performed, nor does it limit the insertion of other steps between the steps. In addition, the embodiment of FIG. 11A may also refer to the embodiments of FIG. 5A , FIG. 5B , FIG. 5C , FIG. 8 , FIG. 10A , FIG. 10B , FIG. 10C , and FIG. 10D .

In an embodiment, the touch signal value corresponding to the line segment and the line segment can be obtained as in steps 810 to 840 in the embodiment of FIG. 8 . Next, step 1110 is executed to calculate the first slope of the edge of the line segment. The first slope referred to here may be the slope of the left edge of the line segment or the slope of the right edge of the line segment. In an example, when the first slope is the slope of the left edge of the line segment, the first relative high point can be found from the far left of the line segment to the right, and then the first relative high point from the left edge of the line segment to the first relative high point can be calculated. slope. In another example, when the first slope is the slope of the right edge of the line segment, the first relative high point can be found from the far right side of the line segment to the left, and then the distance from the right edge of the line segment to the first relative high point can be calculated. first slope. In addition, other slope calculation methods can also be used. For example, the slope value of a certain range of the edge of the line segment can be directly calculated as the above-mentioned first slope.

After the first slope is calculated, step 1120 may be continued to determine whether the first slope is less than a slope threshold. When the result is no, step 1150 may be executed to determine that the line segment does not correspond to the suspended conductive object. When the determination result is true, optional step 1130 may be performed, or step 1140 may be directly performed to determine that the line segment corresponds to the suspended conductive object.

In optional step 1130, it is determined whether the length of the line segment is less than a length threshold. When the determination result is no, step 1150 is executed to determine that the line segment does not correspond to the floating conductive object. When the determination result is true, step 1140 is executed to determine that the line segment corresponds to the suspended conductive object.

Please refer to FIG. 11B , which is a schematic flowchart of determining whether a line segment corresponds to a suspended conductive object according to an embodiment of the present invention. Compared with the embodiment of FIG. 11A , the embodiment of FIG. 11B continues steps 1130 , 1140 , and 1150 . In the initial step 1115, in addition to the first slope, a second slope is also calculated. In other words, the slopes of the left and right edges of the line segment are calculated. When the first slope represents the slope of the left edge of the line segment, the second slope represents the slope of the right edge of the line segment. Conversely, when the first slope represents the slope of the right edge of the line segment, the second slope represents the slope of the left edge of the line segment.

Next, in step 1125, it is determined whether the first slope and the second slope are both greater than a slope threshold. When the determination result is no, step 1150 is executed to determine that the line segment does not correspond to the floating conductive object. When the determination result is true, optional step 1130 may be performed, or step 1140 may be directly performed to determine that the line segment corresponds to the suspended conductive object.

Next, in step 1125, it is determined whether the first slope and the second slope are both greater than a slope threshold. When the determination result is no, step 1150 is executed to determine that the line segment does not correspond to the floating conductive object. When the determination result is true, optional step 1130 may be performed, or step 1140 may be directly performed to determine that the line segment corresponds to the suspended conductive object.

Please refer to FIG. 11C , which is a schematic flowchart of determining whether a line segment corresponds to a suspended conductive object according to an embodiment of the present invention. Compared to the embodiment of FIG. 11A, the embodiment of FIG. 11C uses all the steps, but in a different order. Initially, step 1130 is performed. When the judgment result is no, step 1150 is executed; otherwise, when the judgment result is true, optional step 1110 or 1140 is executed. After optional step 1110 is performed, step 1120 is then performed. When the judgment result is no, step 1150 is executed; otherwise, when the judgment result is true, step 1140 is executed.

Please refer to FIG. 11D , which is a schematic flowchart of determining whether a line segment corresponds to a suspended conductive object according to an embodiment of the present invention. Compared with the embodiment of FIG. 11C , the embodiment of FIG. 11D replaces steps 1110 and 1120 with the aforementioned steps 1115 and 1125 , respectively. Initially, step 1130 is performed. When the judgment result is no, step 1150 is executed; otherwise, when the judgment result is true, optional step 1115 or 1140 is executed. After optional step 1115 is performed, step 1125 is then performed. When the judgment result is no, step 1150 is executed; otherwise, when the judgment result is true, step 1140 is executed.

Please refer to FIG. 12 , which is a schematic flowchart of excluding a line segment group corresponding to a palm according to an embodiment of the present invention. The touch processing device 930 shown in FIG. 9 can be used to execute the flowchart of the method shown in FIG. 12 and all possible variations thereof. The touch processing device 930 may include or be connected to a memory for storing executed software, firmware, touch signal values, their differences, their double differences, and other calculation results or intermediate values. In FIG. 12 , except for steps having a causal relationship, the present invention does not limit the order in which the steps are performed, nor does it limit the insertion of other steps between the steps. In addition, the embodiment of FIG. 12 can also refer to the embodiment of FIG. 6 and FIG. 8 .

Before executing the embodiment of FIG. 12 , steps 810 to 830 of the embodiment shown in FIG. 8 may be executed first. Next, in step 1210, each acquired line segment is formed into one or more line segment groups. As shown in the embodiment of FIG. 6 , when adjacent line segments overlap in a certain range, or each line segment is adjacent in a vertical part, these line segments can be used to form a line segment group. After step 1210, optional step 1220 may be performed or step 1250 may be skipped.

In an optional next step 1220, it is determined whether the current time or the time of obtaining the line segment group is within the validity period of the time stamp. When no time stamp is set, or the above time is not within the validity period of the time stamp, the flow executes an optional step 1240 . Assuming that the above-mentioned time bit is within the validity period of the time stamp, the flow executes optional step 1230 .

As mentioned earlier, judging whether a certain line segment group corresponds to a proximity event caused by a palm may include various conditions. As mentioned in the embodiment of FIG. 6 , when a certain line segment group has one of the following conditions or any combination thereof, it can be considered that the line segment group corresponds to the palm. The first condition is that a certain signal value of a certain line segment in the line segment group is higher than the threshold value of the palm signal, then the line segment group is considered to be the palm. The second condition is when the length of a certain line segment in the line segment group is greater than the threshold value of the palm length. The third condition is when the number of line segments in the line segment group is greater than the threshold value of the number of palm line segments. The threshold value of the palm length may be equal to the threshold value of the number of palm line segments, or it may not be equal.

In optional step 1230, some or all of the thresholds of the above conditions may be relaxed or reduced, such as the above-mentioned thresholds of palm signal, palm length, and number of palm line segments. On the other hand, in the optional step 1240, the threshold value relaxed in the step 1230 is restored. The present invention is not limited to various situations of relaxation and reduction.

Next, step 1250 is executed to determine which line segment group corresponds to the palm line segment group corresponding to the palm according to the above steps 1230, 1240, or the threshold values fixed for each condition. Assuming that step 1250 does not determine any palm line segment group, the process can stop. Conversely, when step 1250 determines one or more palm line segment groups, the process may enter optional step 1260 or directly enter step 1270 .

Step 1260 is optional like steps 1220, 1230, 1240. In step 1260, since one or more palm line segment groups have been found in step 1250, the validity period of the timestamp needs to be updated. If a timestamp has not been established, a new timestamp may be established at step 1260. When performing step 1210, if the time stamp is not set up, the flow can directly jump from step 1210 to step 1250.

In step 1270, the procedure of expanding the palm line segment group is performed. For each palm line segment group, one or all of the following steps can be performed. Step 1270 may include a horizontal expansion step, a vertical expansion step, and a rectangular expansion step.

The step of horizontal expansion is to extend each line segment of the palm line segment group forward and backward by a fixed length or a proportional length respectively along the direction of the line segment. The proportional length may vary with the length of the line segment. If the line segment is longer, it can extend a longer distance. If the line segment is shorter in length, it extends a shorter distance.

The vertical expansion step is to extend the uppermost line segment and the lowermost line segment of the edge of the palm line segment group upward and downward for one or more times respectively, and the length of the extended line segment is the same as or proportional to the length of the edge line segment. For example, the length of the first extension line segment can be 80% of the length of the edge line segment, the length of the second extension line segment can be 80% of the length of the first extension line segment, and so on, until the number of extension line segments reaches the upper limit, or the extension line segment length is below the lower limit.

The step of rectangle expansion is to find an expanded palm rectangle to surround the palm line segment group. In an example, the edge of a palm rectangle will include the uppermost line segment and the lowermost line segment, and the leftmost position and the rightmost position in the palm line segment group. In another embodiment, the expanded palm rectangle may comprise the smallest palm rectangle described above.

The other line segment groups covered by the expanded range are also regarded as palm line segment groups. In the embodiment, the above-mentioned expansion or extension range is limited to only one time, that is, the expanded palm line segment group covered by the expansion range does not need to be extended again. In another embodiment, the above-mentioned expansion or extension range can be multiple times, that is, the expanded palm line segment group covered by the expansion range can be extended again, but the steps of extending or expanding can be the same as the original palm line segment group , and can also be different from the original palm line segment group.

Finally, the process executes step 1280, that is, excludes the palm line segment group found in step 1250 and the expanded palm line segment group expanded in step 1270.

Please refer to FIG. 13 , which is a method for judging a palm line segment group according to an embodiment of the present invention. The touch processing device 930 shown in FIG. 9 can be used to execute the flowchart of the method shown in FIG. 13 and all possible variations thereof. The touch processing device 930 may include or be connected to a memory for storing executed software, firmware, touch signal values, their differences, their double differences, and other calculation results or intermediate values. In FIG. 13 , except for steps having a causal relationship, the present invention does not limit the order in which the steps are performed, nor does it limit the insertion of other steps between the steps. In addition, the embodiment of FIG. 13 can also refer to the embodiment of FIG. 7 and FIG. 12 .

In an embodiment, the embodiment of FIG. 13 may be applied in step 1250 of FIG. 12 . After it is determined in step 1250 that one or more line segment groups are palm line segment groups, the embodiment of FIG. 13 may be performed for verification. However, the present invention does not limit that the embodiment of FIG. 13 must be applicable to the situation of FIG. 12 .

After a certain line segment group is identified as the palm line segment group, step 1310 may be performed first, and the sum of the lengths of each line segment of the line segment group is compared with the palm line segment group length threshold value, when the total length is greater than the palm line segment group length critical value If the value is , the process may execute step 1340 to identify the line segment group as a palm line segment group. Otherwise, the flow may go to step 1330 to determine that the line segment group is not a palm line segment group.

In another embodiment, when the total length is greater than the threshold length of the palm line segment group, step 1320 may be executed again to determine whether the length of each line segment increases and decreases sequentially for a certain number of times. When a certain number of times is reached, the process may execute step 1330 to determine that the line segment group is not a palm line segment group. Otherwise, step 1340 is executed, and the line segment group is determined to be the palm line segment group.

In another embodiment, after a certain line segment group is identified as a palm line segment group, step 1320 may be performed first to determine whether the length of each line segment increases and decreases sequentially for a certain number of times. When a certain number of times is reached, the process may execute step 1330 to determine that the line segment group is not a palm line segment group. Otherwise, step 1340 is executed, and the line segment group is determined to be the palm line segment group.

In another embodiment, when the length of each line segment increases and decreases sequentially for a certain number of times, step 1310 can be performed back. When the total length is greater than the threshold length of the palm line segment group, the process may execute step 1340 to determine the line segment group as the palm line segment group. Otherwise, the flow may go to step 1330 to determine that the line segment group is not a palm line segment group.

To sum up, steps 1310 and/or 1320 can be used to determine whether a certain line segment group is really a palm line segment group. After it is determined that a certain line segment group is not a palm line segment group, it can be disassembled into multiple line segment groups by one of the following steps. For example: You can find the relative low point of the signal value along the middle line of the line group. Cut the group of segments along these relative lows. In addition, it is also possible to find out the line segments in the line segment group whose length is less than a certain length critical value, and cut along these line segments. Furthermore, it is also possible to find out the line segments in the line segment group whose length is shorter than that of the adjacent line segments, and cut along these line segments. Assuming that the lengths of two adjacent line segments are the same and smaller than the lengths of the other two adjacent line segments, the two adjacent line segments with the same length are divided into two line segment groups.

It is worth mentioning that after a certain line segment group is divided into multiple line segment groups, these line segment groups will not be affected by step 1270 in FIG. 12 . In other words, even if these line segment groups are included in the expanded palm line segment group, they will not be added to the palm line segment group.

One of the features of the present invention is to provide a method for judging an erroneous proximity event, comprising: obtaining one or more touch signal values corresponding to a line segment range; calculating the sum of the difference between each touch signal value and a reference value ; and when the sum is less than or equal to zero, the line segment range is considered to correspond to an erroneous proximity event.

One of the features of the present invention is to provide a device for judging an erroneous proximity event, for performing the following steps: obtaining one or more touch signal values corresponding to a line segment range; calculating the difference between each touch signal value and a reference value the sum of the differences; and when the sum is less than or equal to zero, the line segment range is considered to correspond to a false proximity event.

In one embodiment, the method further includes calculating the line segment range according to one-dimensional sensing information including a double difference value of the touch signal value. In another embodiment, the method further includes calculating the one-dimensional sensing information including the double difference value of the touch signal value according to the one-dimensional sensing information including the difference value of the touch signal value. In a further embodiment, the method further includes obtaining the one-dimensional sensing information including the difference value of the touch signal value according to the one-dimensional sensing information including the touch signal value.

In an embodiment, when the sum is greater than zero, the proximity event corresponding to the line segment range is calculated.

One of the features of the present invention is to provide a method for judging whether a line segment corresponds to a stylus tip, the method comprising: obtaining a plurality of touch signal values corresponding to the line segment range; calculating the first slope of the edge of the line segment range; determining Whether the first slope is greater than the slope threshold; when the first slope is greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a device for judging whether a line segment corresponds to a stylus tip, the device is used for performing the following steps: obtaining a plurality of touch signal values corresponding to a line segment range; calculating the edge of the line segment range The first slope is determined; whether the first slope is greater than the slope threshold is determined; when the first slope is greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip.

In an embodiment, when the first slope is greater than the slope threshold, it is then determined whether the length of the line segment is less than the length threshold. When the length of the line segment is less than the length threshold, it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a method for judging whether a line segment corresponds to a stylus tip, the method comprising: obtaining a plurality of touch signal values corresponding to a line segment range; calculating a first slope and a first slope of the edge of the line segment range Two slopes; determine whether the first slope and the second slope are both greater than the slope threshold; when both the first slope and the second slope are greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a device for judging whether a line segment corresponds to a stylus tip, the device is used for performing the following steps: obtaining a plurality of touch signal values corresponding to the line segment range; calculating the edge of the line segment range the first slope and the second slope; determine whether the first slope and the second slope are both greater than the slope threshold; when both the first slope and the second slope are greater than the slope threshold, it is determined that the line segment corresponds to the touch Pen nib.

In an embodiment, when both the first slope and the second slope are greater than the slope threshold, it is then determined whether the length of the line segment is less than the length threshold. When the length of the line segment is less than the length threshold, it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a method for judging whether a line segment corresponds to a stylus tip, the method comprising: judging whether the length of the line segment is less than a length threshold; and when the length of the line segment is less than the length threshold , it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a device for judging whether a line segment corresponds to a stylus tip, the device is used for performing the following steps: judging whether the length of the line segment is less than a length threshold; and when the length of the line segment is less than When the length is the critical value, it is determined that the line segment corresponds to the tip of the stylus.

In an embodiment, the method further includes: when the length of the line segment is less than the length threshold, obtaining a plurality of touch signal values corresponding to the line segment range; calculating a first slope of the edge of the line segment range; judging whether the first slope is greater than a slope threshold; when the first slope is greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip.

In an embodiment, the method further includes: when the length of the line segment is less than the length threshold, obtaining a plurality of touch signal values corresponding to the line segment range; calculating the first slope and the second slope of the edge of the line segment range; determining the first slope Whether the slope and the second slope are both greater than the slope threshold; when both the first slope and the second slope are greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip.

One of the features of the present invention is to provide a method for determining whether a line segment corresponds to a floating conductive object, the method comprising: obtaining a plurality of touch signal values corresponding to the line segment range; calculating a first slope of the edge of the line segment range; It is judged whether the first slope is less than the slope threshold; when the first slope is less than the slope threshold, it is determined that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is a device for judging whether a line segment corresponds to a floating conductive object, the device is used for performing the following steps: obtaining a plurality of touch signal values corresponding to the line segment range; calculating the edge of the line segment range a first slope; judging whether the first slope is less than a slope threshold value; when the first slope is less than the slope threshold value, it is determined that the line segment corresponds to the suspended conductive object.

In an embodiment, when the first slope is less than the slope threshold value, it is further determined whether the length of the line segment is less than the length threshold value. When the length of the line segment is less than the length threshold, it is determined that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is to provide a method for judging whether a line segment corresponds to a floating conductive object, the method comprising: obtaining a plurality of touch signal values corresponding to the line segment range; calculating the first slope of the edge of the line segment range and second slope; determine whether the first slope and the second slope are both less than a slope threshold; when both the first slope and the second slope are less than the slope threshold, determine that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is a device for judging whether a line segment corresponds to a floating conductive object, the device is used for performing the following steps: obtaining a plurality of touch signal values corresponding to the line segment range; calculating the edge of the line segment range the first slope and the second slope; determine whether the first slope and the second slope are both less than the slope threshold; when both the first slope and the second slope are less than the slope threshold, it is determined that the line segment corresponds to the suspension conductive objects.

In an embodiment, when both the first slope and the second slope are less than the slope threshold, it is then determined whether the length of the line segment is less than the length threshold. When the length of the line segment is less than the length threshold, it is determined that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is to provide a method for judging whether a line segment corresponds to a floating conductive object, the method comprising: judging whether the length of the line segment is less than a length threshold; and when the length of the line segment is less than the length threshold , it is determined that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is to provide a device for judging whether a line segment corresponds to a suspended conductive object, the device is used for performing the following steps: judging whether the length of the line segment is less than a length threshold; and when the length of the line segment is less than When the length is the critical value, it is determined that the line segment corresponds to the suspended conductive object.

In an embodiment, the method further includes: when the length of the line segment is less than the length threshold, obtaining a plurality of touch signal values corresponding to the line segment range; calculating the first slope of the edge of the line segment range; judging whether the first slope is less than a slope threshold; when the first slope is less than the slope threshold, it is determined that the line segment corresponds to the suspended conductive object.

In an embodiment, the method further includes: when the length of the line segment is less than the length threshold, obtaining a plurality of touch signal values corresponding to the line segment range; calculating the first slope and the second slope of the edge of the line segment range; determining the first slope Whether the slope and the second slope are both less than the slope threshold; when the first slope and the second slope are both less than the slope threshold, it is determined that the line segment corresponds to the suspended conductive object.

One of the features of the present invention is to provide a method for excluding line segment groups corresponding to the palm, the method comprising: obtaining a plurality of line segment groups; judging whether one or more palm line segment groups exist in the plurality of line segment groups; When the palm line segment group exists, the palm line segment group is expanded; and the expanded palm line segment group is excluded.

One of the features of the present invention is to provide a device for excluding line segment groups corresponding to the palm, the device is used for performing the following steps: obtaining a plurality of line segment groups; and judging the plurality of line segment groups according to the judgment conditions of the palm line segment groups Whether there are one or more palm line segment groups; when the palm line segment group exists, expand the palm line segment group; and exclude the expanded palm line segment group.

In an embodiment, it further includes: after obtaining the plurality of line segment groups, judging whether the time for obtaining the plurality of line segment groups is within the validity period of the timestamp; when within the validity period, relaxing the judgment condition of the palm line segment group; When it is not within the validity period, the judgment condition of the palm line segment group is restored. In another embodiment, the method further includes: updating the validity period of the timestamp when the palm line segment group exists.

In an embodiment, the judgment condition of the palm line segment group includes: when a certain signal value of a certain line segment of the line segment group of the plurality of line segment groups is higher than the palm signal threshold value, it is considered that the line segment group is the palm line segment group .

In an embodiment, the judgment condition of the palm line segment group includes: when the length of a line segment of the line segment group of the plurality of line segment groups is greater than the palm length threshold, the line segment group is considered to be the palm line segment group.

In an embodiment, the judgment condition of the palm line segment group includes that when the number of line segments of the line segment group of the plurality of line segment groups is greater than the threshold value of the number of palm line segment groups, the line segment group is considered to be the palm line segment group.

In an embodiment, the above judgment condition for relaxing the palm line segment group includes lowering one or any combination of the following threshold values: a palm signal threshold value; a palm length threshold value; and a palm line segment group quantity threshold value. In another embodiment, the above judgment condition for restoring the palm line segment group includes restoring one or any combination of the following threshold values: a palm signal threshold value; a palm length threshold value; and a palm line segment number threshold value.

In an embodiment, the step of expanding the palm line segment group further includes one of the following steps or any combination thereof: a horizontal expanding step; a vertical expanding step; and a rectangular expanding step.

In an embodiment, in the horizontal expansion step, each line segment of the palm line segment group is respectively extended forward and backward by a fixed length or a proportional length along the direction of the line segment. In another embodiment, the proportional length varies with the length of the line segment.

In an embodiment, the vertical expansion step is to extend the uppermost line segment and the lowermost line segment of the edge of the palm line segment group upwards and downwards one or more times respectively, and the length of the extended line segment is the same as or proportional to the length of the edge line segment relation. In another embodiment, the length of the extended line segment and the length of the edge line segment and the number of times of extension are in a proportional relationship.

In an embodiment, the step of expanding the rectangle is to find an expanded palm rectangle to surround the palm line segment group. In another embodiment, the expanded palm rectangle comprises the smallest palm rectangle.

In an embodiment, the method further includes: before expanding the palm line segment group, judging whether the palm line segment group needs to be divided. In another embodiment, it further includes: when one of the following conditions or any combination thereof is established, determining that the palm line segment group needs to be divided: judging that the total length of the palm line segment group is greater than a critical value of the length of the palm line segment group; and judging The length of each line segment of the palm line segment group sequentially increases and decreases for a certain number of times.

In the embodiment, when it is determined that the palm line segment group needs to be divided, finding a plurality of relative low points of the signal value along the center line of the palm line segment group. The palm line segment group is cut along the plurality of relative low points. In the embodiment, when it is determined that the palm line segment group needs to be divided, find out a plurality of line segments in the palm line segment group whose line segment length is less than a certain length threshold, and cut along the plurality of line segments. In the embodiment, when it is determined that the palm line segment group needs to be divided, a plurality of line segments in the line segment group whose line segment lengths are shorter than the adjacent line segment lengths are cut along the plurality of line segments. In another embodiment, when the lengths of two adjacent line segments are the same and smaller than the lengths of the other two adjacent line segments, the two adjacent line segments with the same length are divided into two line segment groups.

In an embodiment, when the palm line segment group is divided into a plurality of second line segment groups, the plurality of second line segment groups will not become the expanded palm line segment group.

One of the features of the present invention is to provide a method for judging whether a palm line segment group needs to be divided, the method comprising: when one of the following conditions or any combination thereof is established, it is determined that the palm line segment group needs to be divided: judging the palm line segment group The total length of the line segment group is greater than a critical value of the length of the palm line segment group; and it is judged that the length of each line segment of the palm line segment group sequentially increases and decreases for a certain number of times.

One of the features of the present invention is to provide a device for judging whether the palm line segment group needs to be divided, the device is used for executing the following steps: when one of the following conditions or any combination thereof is established, it is determined that the palm line segment group needs to be divided Segmentation: judging that the total length of the palm line segment group is greater than a critical value of the length of the palm line segment group; and judging that the length of each line segment of the palm line segment group sequentially increases and decreases for a certain number of times.

In the embodiment, when it is determined that the palm line segment group needs to be divided, finding a plurality of relative low points of the signal value along the center line of the palm line segment group. The palm line segment group is cut along the plurality of relative low points. In the embodiment, when it is determined that the palm line segment group needs to be divided, find out a plurality of line segments in the palm line segment group whose line segment length is less than a certain length threshold, and cut along the plurality of line segments. In the embodiment, when it is determined that the palm line segment group needs to be divided, a plurality of line segments in the line segment group whose line segment lengths are shorter than the adjacent line segment lengths are cut along the plurality of line segments. In another embodiment, when the lengths of two adjacent line segments are the same and smaller than the lengths of the other two adjacent line segments, the two adjacent line segments with the same length are divided into two line segment groups.

The above descriptions are merely various embodiments of the present invention, and the scope of the present invention shall be defined by the scope of the claims.

Claims (8)

1. A method for judging whether a line segment corresponds to a stylus tip, comprising the following steps: obtaining a plurality of pieces of one-dimensional sensing information measured by each sensing electrode of the touch panel, and each piece of the one-dimensional sensing information includes a plurality of pieces of information corresponding to the sensing points of each driving electrode of the touch panel; Find a line segment by using the plurality of pieces of one-dimensional sensing information, wherein the line segment is all or a continuous part of the one-dimensional sensing information; determine whether the length of the line segment is less than a length threshold; and When the length of the line segment is less than the length threshold value, obtain a plurality of touch signal values corresponding to the range of the line segment; and The following first-step combinations or second-step combinations: The first step combination: Calculate the first slope of the edge of the line segment range; determining whether the first slope is greater than a slope threshold; and When the first slope is greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip; Second step combination: Calculate the first slope and the second slope of the edge of the line segment; determining whether the first slope and the second slope are both greater than a slope threshold; and When both the first slope and the second slope are greater than the slope threshold, it is determined that the line segment corresponds to the stylus tip. 2 . The method of claim 1 , wherein when the length of the line segment is greater than the length threshold, it is determined that the line segment corresponds to the floating conductive object. 3 . 3. The method for judging whether a line segment corresponds to a stylus tip according to claim 1, further comprising the steps of: after finding all the line segments, checking the line segments for removing water and Ghost point. 4. The method for judging whether a line segment corresponds to a stylus tip according to claim 1, further comprising the following steps: When all the line segments are found, the adjacent vertical parts of each line segment are combined into a line segment group in order to find the centroid of the approaching event. 5. A device for judging whether a line segment corresponds to a stylus tip, characterized in that it comprises the following devices: A device for obtaining multiple pieces of one-dimensional sensing information measured by respective sensing electrodes of a touch panel, each piece of one-dimensional sensing information includes multiple pieces of information corresponding to sensing points of respective drive electrodes of the touch panel ; A device for finding a line segment by using the plurality of pieces of one-dimensional sensing information, wherein the line segment is all or a continuous part of the one-dimensional sensing information; means for determining whether the length of the line segment is less than a length threshold; and When the length of the line segment is less than the length threshold, a device for obtaining a plurality of touch signal values corresponding to the line segment range, the device includes the following first device combination or second device combination: The first device combination: means for calculating the first slope of the edge of the line segment; means for determining whether the first slope is greater than a slope threshold; and When the first slope is greater than the slope threshold, it is determined that the line segment corresponds to the device of the stylus tip; Second device combination: means for calculating the first slope and the second slope of the edge of the line segment; means for determining whether both the first slope and the second slope are greater than a slope threshold; and When both the first slope and the second slope are greater than the slope threshold, it is determined that the line segment corresponds to the device of the stylus tip. 6 . The device for judging whether a line segment corresponds to a stylus tip according to claim 5 , further comprising determining that the line segment corresponds to the floating conductive object when the length of the line segment is greater than the length threshold. 7 . device. 7. The device for judging whether a line segment corresponds to a stylus tip according to claim 5, further comprising a device for checking the line segment after finding all the line segments, for removing water and Ghost point. 8 . The device for judging whether a line segment corresponds to a stylus tip according to claim 5 , further comprising: after finding all the line segments, combining each of the line segments adjacent to the vertical part into a A group of line segments in order to find a means of approaching the centroid of an event.

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