TW201445428A - Palm rejection method - Google Patents

Abstract

A palm rejection method is provided for use in a device which adopts a touch panel. When a user rests his hand on the touch panel for inputting data, the palm rejection method differentiates between intentional and inadvertent contact points according to user hand or writing habit, thereby increasing the accuracy of the touch panel.

Description

Prevent palm touch method

The invention relates to a method for preventing palm touch, especially a method for preventing palms from being touched according to a user's palm or writing manner.

In today's various consumer electronics market, because the product design is light, thin, short, and small, there is not enough space to accommodate traditional input devices such as keyboards and mice, especially in the tablet design that is user-friendly. Driven by demand, display devices with touch panels have gradually become one of the key components of various electronic products, such as personal digital assistants (PDAs), mobile phones, and smart phones. Portable electronic devices such as mobile phones or tablets.

The touch panel uses a sensor to detect changes in resistance, capacitance, pressure or light intensity caused by a touch event to determine the touch coordinates, and then outputs the touch coordinates to the system. However, when the user inputs data on the touch panel in the writing mode, it is easy to get used to leaning the palm on the screen. At this time, the sensor senses the movement of the palm and the finger at the same time, and the detection cannot be detected correctly. Input information about the user's writing behavior.

The present invention provides a method for preventing accidental touch of a touch panel, comprising: if a plurality of touch coordinates are received when a touch event is detected, generating a plurality of determination regions according to a predetermined distance, wherein each of the determination regions Each of the plurality of touch coordinates includes a corresponding touch coordinate; the touch coordinates included in the plurality of determination regions overlapping or adjacent to each other are added to the same group; and when a specific group When only a single touch coordinate is included, the coordinate value of the single touch coordinate is output.

110~160‧‧‧Steps

R‧‧‧Predetermined distance

R’‧‧‧Reference distance

A0~AN, B0~BN‧‧‧ judgment area

A0’~AN’‧‧‧ reference judgment area

G0~GN‧‧‧Group

G0’~GN’‧‧‧ Reference Group

F, P1~PN‧‧‧ touch coordinates

F’, P1’~PN’‧‧‧ reference touch coordinates

Figure 1 is a flow chart of a method for preventing palm touch by mistake in the present invention.

2 to 6 are schematic views showing a method of preventing palm touch by mistake in the embodiment of the present invention.

Figure 1 is a flow chart of a method for preventing palm rejection in the present invention, which comprises the following steps:

Step 110: Determine a predetermined distance R, and perform step 120.

Step 120: Determine the number of touch coordinates when the touch event is detected: if a plurality of touch coordinates are detected, go to step 130; if a single touch coordinate is detected, go to step 160.

Step 130: Generate a plurality of determination regions according to the predetermined distance R and the plurality of touch coordinates, wherein each of the determination regions includes a corresponding touch coordinate of the plurality of touch coordinates, and step 140 is performed.

Step 140: Add the touch coordinates included in the judgment area overlapping or adjacent to each other to the same group, and perform step 150.

Step 150: Perform step 120 for the coordinate value corresponding to the group output containing only a single touch coordinate.

Step 160: Output a coordinate value of a single touch coordinate, and perform step 120.

In step 110, the predetermined distance R may be related to the size of the user's palm or the writing habit, and the manner of determining the predetermined distance R will be described in detail later in the specification. In step 120, the present invention determines whether a single or a plurality of touch coordinates are received when a touch event is detected. If only a single touch coordinate is received, the present invention performs step 160. To output the coordinate value of the single touch coordinate; if a plurality of touch coordinates are received, the present invention performs step 130.

2 and 3 are schematic views of the first embodiment of the present invention when the method of determining the false touch is performed. The black dot represents all touch coordinates received when a touch event is detected, where F represents the touch coordinates detected by the user when inputting with a finger or a stylus, and P1~PN represents a user's palm error. The touched coordinates detected by the touch. In the embodiment shown in FIG. 2, the present invention generates a plurality of circular determination areas A0 to AN having a radius R in each step, with each touch coordinate being centered in step 130. In the embodiment shown in FIG. 3, the present invention generates a plurality of square determination regions B0 to BN having a side length of 2R, respectively, centering on each touch coordinate in step 130. In other embodiments of the present invention, each of the touch coordinates may be used as a reference point in step 130 to generate corresponding other types of geometric determination regions according to the predetermined distance R (for example, the long and short axes are related to the predetermined distance R, elliptical, rectangular , triangle or ladder, etc.) or a judging area of any shape. The present invention can generate a plurality of determination regions of the same shape and size according to each touch coordinate and the predetermined distance R. Figures 2 and 3 are merely examples and do not limit the scope of the present invention.

When the user accidentally touches the palm of the hand by inputting data on the touch panel, the touch coordinates P1 to PN of the palm portion of the user are close to each other, and the actual input of the corresponding finger or the stylus is The distance between the touch coordinate F and the other touch coordinates P1~PN is far. Since the predetermined distance R is related to the size or writing habit of the user's palm, if it is detected in step 140 that the two determination regions overlap or are adjacent to each other, it can be determined that the corresponding touch coordinates are caused by the palm touch. of.

For example, due to the touch coordinates F and other touch coordinates P1 ~ PN distance Further, the circular determination area A0 and the other circular determination areas A1 to AN do not overlap or be adjacent to each other, or the square determination area B0 and the other square determination areas B1 to BN do not overlap or are adjacent to each other. The present invention will add the touch coordinates F to the group G0 in step 140. Since the touch coordinates P1 to PN are close to each other, the circular determination areas A1 to AN or the square determination areas B1 to BN overlap or are adjacent to each other. At this time, the present invention will touch the coordinates P1 to PN in step 140. Join group G1. Next, in step 150, the present invention only outputs the coordinate value of the touch coordinate F for the group G0 including a single touch coordinate.

In an embodiment of the invention, the predetermined distance R may be input by the user or provided by the system for the user to select. In another embodiment of the present invention, the system may require the user to place the palm of the hand on the touch panel in a writing state, and then determine the optimal predetermined distance R according to the user's hand shape.

4 to 6 are schematic views of the method for preventing accidental touch of the touch panel in the step 110. When the user puts the palm of the hand on the touch panel, the system can detect the reference touch coordinate F′ corresponding to the user's finger or the stylus, and corresponding to the palm area of the user. Refer to the touch coordinates P1'~PN'. In the embodiment shown in FIG. 4 to FIG. 6, the present invention will generate a plurality of circular reference determination regions A0' having a radius of the reference distance R', respectively, in step 110 with each reference touch coordinate as a center. ~AN'. When the two reference determination regions overlap or are adjacent to each other, the present invention adds the corresponding two reference touch coordinates to the same reference group. After all of the reference touch coordinates are added to a particular reference group, it is then determined whether only two reference groups are generated, and one of them contains only a single reference touch coordinate. If the above condition is not satisfied, it means that the false touch situation cannot be correctly determined according to the reference distance R'. The present invention adjusts the value of the reference distance R' in step 110, and then generates the reference judgment area and the reference touch in the same manner. Touch the coordinates to join the reference group. Until the above conditions are satisfied, the present invention sets the predetermined distance R to the value of the reference distance R' in step 110, and then performs step 120.

In the embodiment shown in FIG. 4, the reference distance R' is much smaller than the ideal value, so each reference touch coordinate is added to the respective reference group G0'~GN', so that the system cannot discriminate all the causes due to the palm. The reference touch coordinates, at this time need to increase the value of the reference distance R' to correctly determine the false touch situation.

In the embodiment shown in FIG. 5, the initial predetermined distance R' is slightly smaller than the ideal value, and the reference touch coordinates caused by the palm may be added to different reference groups (for example, G1' and G2'), so that the system cannot discriminate. In part, due to the reference touch coordinates (such as PN') caused by the palm, it is necessary to increase the value of the reference distance R' to correctly judge the false touch situation.

In the embodiment shown in FIG. 6, the initial predetermined distance R' is larger than the ideal value, and all the determination areas A0'~AN' overlap or contact each other, so all the reference touch coordinates are added to the reference group G0', so that The system cannot discriminate all the touch coordinates caused by the palm. In this case, it is necessary to reduce the value of the reference distance R' to correctly judge the false touch situation.

In the embodiment shown in FIG. 4 to FIG. 6 , the present invention may also use each reference touch coordinate as a reference point in step 110 to generate corresponding other types of geometric reference determination regions according to the reference distance R′ ( For example, a square, an ellipse, a rectangle, a triangle, or a ladder, or the like, or a reference judgment area of an arbitrary shape. The present invention can generate a plurality of reference determination regions of the same shape and size according to each of the reference touch coordinates and the reference distance R', and then determine the value of the predetermined distance R according to the foregoing manner. 4 to 6 are merely examples and do not limit the scope of the present invention.

The invention provides a method for preventing the palm from being touched by mistake, and the device using the touch panel can be realized by a soft body or a firmware. When the user inputs data on the touch panel in the writing mode, the invention can distinguish the actual touch coordinates and the accidental touch coordinates according to the user's palm or writing manner, thereby improving the recognition degree of the touch panel.

110~160‧‧‧Steps

Claims (8)

A method for preventing accidental touch of a touch panel, comprising: if a plurality of touch coordinates are received when a touch event is detected, generating a plurality of determination regions according to a predetermined distance, wherein each of the determination regions respectively Include a corresponding touch coordinate of the plurality of touch coordinates; add the touch coordinates included in the determination area overlapping or adjacent to each other in the plurality of determination areas to the same group; and when a specific group only includes When a single touch coordinate is used, the coordinate value of the single touch coordinate is output. The method of claim 1, further comprising: generating, by each of the touch coordinates, a plurality of circular determination regions having a radius of the predetermined distance, or a plurality of ellipse of the long and short axes associated with the predetermined distance Shape judgment area. The method of claim 1, further comprising: generating, by each of the touch coordinates, a plurality of geometric determination regions each having a side length associated with the predetermined distance. The method of claim 1, wherein each of the determination regions has the same shape and size. The method of claim 1, further comprising: determining the predetermined distance according to a user's palm or writing habit. The method of claim 5, further comprising: detecting when the user puts the palm of the hand on the touch panel Detecting a plurality of reference touch coordinates; respectively generating a plurality of reference determination regions according to a reference distance, wherein each of the reference determination regions respectively includes a corresponding reference touch coordinate of the plurality of reference touch coordinates; Referencing the reference touch coordinates included in the reference judgment area overlapping or adjacent to each other in the reference area to join the same reference group; and if only two reference groups are generated after all the reference touch coordinates are added to the specific reference group, And when one of them only contains a single reference touch coordinate, the predetermined distance is set as the value of the reference distance. The method of claim 6, further comprising: if only a single reference group is generated after all reference touch coordinates are added to the specific reference group, and the single reference group includes a plurality of reference touch coordinates, Shorten the predetermined distance. The method of claim 6, further comprising: increasing the predetermined distance if more than two reference groups are generated after all of the reference touch coordinates are added to the specific reference group.