TWI696106B - Circular touch screen sensing method, touch display device and information processing device - Google Patents

Abstract

A round touch screen sensing method, which acts on a round touch area, the round touch area is cut into a virtual square touch area, the virtual square touch area has a plurality of square sensing Unit, the circular touch area has a plurality of square electrodes and a plurality of non-square electrodes, and the square electrode corresponds to the square sensing unit, the method includes: according to one of the circular touch areas The position of a maximum value of the touch area is the center to define a coordinate calculation area including a plurality of sub-areas; and determine whether the coordinate calculation area exceeds the virtual square touch area, and if so, perform a compensation calculation procedure on the coordinate calculation area In order to generate a touch coordinate, the compensation calculation procedure includes: setting the corresponding capacitance value of each of the sub-regions outside the virtual square touch area to 0, and placing it in the virtual square touch area but in the circle Each of the sub-areas outside the shape touch area is regarded as a compensation sub-area, and each compensation sub-area is filled with a compensation capacitance value; and a plurality of values included in the coordinate calculation area are weighted Average calculation.

Description

Circular touch screen sensing method, touch display device and information processing device

The invention relates to a touch screen sensing method, in particular to a circular touch screen sensing method.

With the popularity and vigorous development of mobile devices, touch display devices have become one of the indispensable components. However, in the touch sensing of the circular touch screen, the touch sensing of the border area may cause an inaccurate problem because the sensing electrode is cut.

Please refer to FIG. 1, which illustrates a schematic diagram of a conventional circular touch screen. As shown in FIG. 1, the conventional circular touch screen has a circular touch area 20 which is inscribed in a virtual square touch area 10, wherein the virtual square touch area 10 has a plurality of square sensing units, the circular touch area has a middle area and a plurality of side areas, the middle area has a plurality of square electrodes 10a, each of the side areas has at least one non-square electrode 10b, and the square The electrode 10a corresponds to the square sensing unit. In other words, the circular touch area 20 is cut from a square electrode array corresponding to the virtual square touch area 10.

However, when a user performs a touch operation along the circumference of the circular touch area 20, please refer to FIG. 2, the touch track 20a sensed by the conventional circular touch screen is cut due to the sensing electrode The problem of mismatching with the actual touch position occurs.

In order to solve the above-mentioned problems, a novel circular touch screen sensing method is urgently needed in the art.

An object of the present invention is to disclose a method for sensing a circular touch screen, which can make the boundary of the circular touch sensing area approximate a standard circle by performing a compensation procedure at the touch points on the boundary.

Another object of the present invention is to disclose a touch device that can perform a compensation process by touching points on the boundary of a circular touch screen so that the boundary of the circular touch sensing area can approximate a standard circle.

Another object of the present invention is to disclose an information processing device which can perform a compensation process by touching points on the boundary of a circular touch screen so that the boundary of the circular touch sensing area can approximate a standard circle.

To achieve the aforementioned objective, a circular touch screen sensing method is proposed, which is realized by driving a circular touch area with a control circuit, the circular touch area being cut into a virtual square touch area, Wherein, the virtual square touch area has a plurality of square sensing units, the circular touch area has a circle center, a radius, a middle area and a plurality of side areas, the middle area has a plurality of square electrodes, each of the side areas With at least one non-square electrode, and the square electrode corresponding to the square sensing unit, the method includes the following steps:

Performing a touch scanning process on the circular touch area to generate a frame of capacitance value data and setting a data area in the frame capacitance value data greater than a threshold as a touch area;

A coordinate calculation area is defined based on the position of a maximum value of the touch area, the coordinate calculation area has a plurality of sub-areas, the area of the sub-area is the same as the area of the square sensing unit; and

Determine whether the coordinate calculation area exceeds the virtual square touch area, if not, perform a weighted average calculation on the plurality of capacitance values contained in the plurality of sub-areas to generate a touch coordinate, if yes, then The coordinate calculation area performs a compensation calculation procedure to generate a touch coordinate, wherein the compensation calculation procedure includes: setting the corresponding capacitance value of each of the sub-areas located outside the virtual square touch area to 0, and setting Each of the sub-areas in the virtual square touch area but outside the circular touch area is regarded as a compensation sub-area, and a compensation procedure is performed on each of the compensation sub-areas to fill in a compensation capacitor Value; and performing a weighted average calculation on the plurality of values contained in the plurality of sub-areas of the coordinate calculation area.

In one embodiment, the compensation procedure uses the center of the coordinate calculation area as a search center and the distance between the compensation sub-area and the search center as a search radius to locate the circular touch area A search track is formed in the search track, and each of the square electrodes or the non-square electrodes located in the search track is used as a reference electrode, and an average calculation is performed based on the capacitance value data of at least one reference electrode to Generate the compensation capacitor value.

，

In an embodiment, when the touch coordinate is located outside the circular touch area, the compensation calculation program further includes a boundary coordinate normalization operation, the boundary coordinate normalization operation is:

,

為該觸控座標與該圓心之連線和一直角座標平面之X軸之一夾角，R為該圓形觸控區的所述半徑，及x、y分別為該直角座標平面的橫座標與縱座標。 among them,

Is the angle between the touch coordinate and the center of the circle and the X axis of the right-angle coordinate plane, R is the radius of the circular touch area, and x and y are the horizontal coordinate and the horizontal coordinate of the right-angle coordinate plane, respectively. Vertical coordinate.

In one embodiment, the control circuit has a processor and a memory unit to execute a program to implement the circular touch screen sensing method.

In a possible embodiment, the memory unit may include a register, a cache memory, or a random access memory.

To achieve the foregoing purpose, the present invention provides a touch display device having a touch display drive circuit and a touch display panel, wherein the touch display drive circuit is used to drive the touch display panel, and the touch The display driving circuit includes the aforementioned control circuit to implement the aforementioned circular touch screen sensing method.

In a possible embodiment, the touch display panel may be a liquid crystal touch display panel, an LED touch display panel, or an OLED touch display panel.

To achieve the foregoing objective, the present invention further provides an information processing device having the touch display device as described above.

In a possible embodiment, the information processing device may be a smart phone, a smart watch, a smart bracelet or a car instrument. In order to enable your review committee to further understand the structure, features and purpose of the present invention,

The drawings and the detailed description of the preferred embodiments are attached as follows.

Please refer to FIG. 3, which illustrates a flowchart of an embodiment of a method for sensing a round touch screen of the present invention, wherein the method is implemented by driving a round touch area using a control circuit. The area is cut within a virtual square touch area (please refer to FIG. 1), wherein the virtual square touch area has a plurality of square sensing units, and the circular touch area has a center, a radius, and a middle area And a plurality of side regions, the middle region has a plurality of square electrodes, each of the side regions has at least one non-square electrode, and the square electrode corresponds to the square sensing unit. As shown in FIG. 3, the method includes the following steps: performing a touch scanning procedure on the circular touch area to generate a frame of capacitance value data and setting a data area of the frame capacitance value data greater than a threshold to one Touch area (step a); a coordinate calculation area is defined based on the position of a maximum value of the touch area, the coordinate calculation area has a plurality of sub-areas, the area of the sub-areas is the same as that of the square sensing unit Area (step b); and determine whether the coordinate calculation area exceeds the virtual square touch area, and if not, perform a weighted average calculation on the plurality of capacitance values contained in the plurality of sub-areas to generate a touch The control coordinates, if yes, perform a compensation calculation procedure on the coordinate calculation area to generate a touch coordinate (step c).

In step c, the compensation calculation procedure includes: setting the corresponding capacitance value of each of the sub-regions located outside the virtual square touch area to 0, and setting the position within the virtual square touch area but within the circular touch area Each of the sub-areas outside the control area is regarded as a compensation sub-area, and a compensation procedure is performed on each of the compensation sub-areas to fill in a compensation capacitance value; and the plurality of sub-areas of the coordinate calculation area The multiple values contained in the zone are calculated by a weighted average.

Preferably, the compensation procedure uses the center of the coordinate calculation area as a search center and the distance between the compensation sub-area and the search center as a search radius to form in the circular touch area A search track, and each of the square electrodes or the non-square electrodes located in the search track is used as a reference electrode, and an average calculation is performed based on the capacitance value data of at least one reference electrode to generate The compensation capacitor value mentioned.

Please refer to FIG. 4, which is a schematic diagram of the coordinate calculation area of the circular touch screen sensing method of FIG. 3. As shown in FIG. 4, a virtual square touch area 10 has 25 sub-areas, where H is the search center. When #2 is used as the compensation target, J, O, Q, U, and S can be found as reference electrodes based on the distance between #2 and H as the radius, and then at least one of J, O, Q, U, and S can be used An average calculation is performed on the capacitance value data of the reference electrode to generate the compensation capacitance value.

，

Preferably, when the touch coordinate is located outside the circular touch area, the compensation calculation program further includes a boundary coordinate normalization operation, the boundary coordinate normalization operation is:

,

為該觸控座標與該圓心之連線和一直角座標平面之X軸之一夾角，R為該圓形觸控區的所述半徑，及x、y分別為該直角座標平面的橫座標與縱座標。請參照圖5，其為圖3之圓形觸控屏感測方法之所述邊界座標歸化運算的一示意圖。如圖5所示，一位於一圓形觸控區20外部之一觸控軌跡點P在經所述邊界座標歸化運算後即歸化到圓形觸控區20的圓周上。 among them,

Is the angle between the touch coordinate and the center of the circle and the X axis of the right-angle coordinate plane, R is the radius of the circular touch area, and x and y are the horizontal coordinate and the horizontal coordinate of the right-angle coordinate plane, respectively. Vertical coordinate. Please refer to FIG. 5, which is a schematic diagram of the boundary coordinate normalization operation of the circular touch screen sensing method of FIG. 3. As shown in FIG. 5, a touch track point P located outside a circular touch area 20 is normalized to the circumference of the circular touch area 20 after the boundary coordinate normalization operation.

Preferably, the control circuit has a processor and a memory unit to execute a program to realize the circular touch screen sensing method.

Preferably, the memory unit may include a register, a cache memory or a random access memory.

According to the above description, the present invention further provides a touch display device. Please refer to FIG. 6, which illustrates a block diagram of an embodiment of the touch display device of the present invention. As shown in FIG. 6, a touch display device 100 has a touch display driving circuit 110 and a touch display panel 120, wherein the touch display driving circuit 100 is used to drive the touch display panel 120, and the touch The control display driving circuit 110 includes a control circuit 111 to implement the circular touch screen sensing method described in FIG. 3. In addition, the control circuit 111 has a processor 111a and a memory unit 111b to execute a program to realize the circular touch screen sensing method. In a possible embodiment, the memory unit 111b may include a register, a cache memory, or a random access memory.

In addition, in a possible embodiment, the touch display panel 120 may be a liquid crystal touch display panel, an LED touch display panel, or an OLED touch display panel.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 7, which illustrates a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 7, an information processing device 200 has the aforementioned touch display device 100. In a possible embodiment, the information processing device 200 may be a smart phone, a smart watch, a smart bracelet or a car instrument.

With the design disclosed above, the present invention has the following advantages:

1. The circular touch screen sensing method of the present invention can make the boundary of the circular touch sensing area approximate a standard circle by performing a compensation procedure at the touch points on the boundary.

2. The touch device of the present invention can perform a compensation procedure by touching points on the boundary of the circular touch screen, so that the boundary of the circular touch sensing area can approximate a standard circle.

3. The information processing device of the present invention can perform a compensation process by the touch points at the boundary of the circular touch screen, so that the boundary of the circular touch sensing area can approximate a standard circle.

The case disclosed in this case is a preferred embodiment, and any part of the changes or modifications that originated from the technical ideas of this case and are easily inferred by those who are familiar with the art, do not deviate from the scope of patent rights in this case.

In summary, regardless of the purpose, means and effects of this case, this case shows that it is very different from conventional techniques, and its first invention is practical and practical, and it does meet the patent requirements of the invention. To benefit society is to pray for the most.

Step a: Perform a touch scanning process on the circular touch area to generate a frame of capacitance value data and set a data area in the frame capacitance value data greater than a threshold as a touch area

Step b: A coordinate calculation area is defined based on the position of a maximum value of the touch area. The coordinate calculation area has a plurality of sub-areas, and the area of the sub-areas is the same as the area of the square sensing unit

Step c: Determine whether the coordinate calculation area exceeds the virtual square touch area. If not, perform a weighted average calculation on the plurality of capacitance values contained in the plurality of sub-areas to generate a touch coordinate. , Then perform a compensation calculation procedure on the coordinate calculation area to generate a touch coordinate

10: Virtual square touch area

10a: square electrode

10b: Non-square electrode

20: circular touch area

20a: Touch track

100: touch display device

110: Touch display drive circuit

111: control circuit

111a: processor

111b: memory unit

120: Touch display panel

200: Information processing device

FIG. 1 shows a schematic diagram of a conventional circular touch screen. Figure 2 shows the touch trajectory sensed on the circumference of the circular touch screen of Figure 1. FIG. 3 illustrates a flowchart of an embodiment of the method for sensing a round touch screen of the present invention. Fig. 4 is a schematic diagram of the coordinate calculation area of the circular touch screen sensing method of Fig. 3. FIG. 5 is a schematic diagram of the boundary coordinate normalization operation of the circular touch screen sensing method of FIG. 3. FIG. 6 is a block diagram of an embodiment of the touch display device of the present invention. FIG. 7 shows a block diagram of an embodiment of the information processing device of the present invention.

Step a: Perform a touch scanning process on the circular touch area to generate a frame of capacitance value data and set a data area in the frame capacitance value data greater than a threshold as a touch area

Step b: A coordinate calculation area is defined based on the position of a maximum value of the touch area. The coordinate calculation area has a plurality of sub-areas, and the area of the sub-areas is the same as the area of the square sensing unit

Step c: Determine whether the coordinate calculation area exceeds the virtual square touch area. If not, perform a weighted average calculation on the plurality of capacitance values contained in the plurality of sub-areas to generate a touch coordinate. , Then perform a compensation calculation procedure on the coordinate calculation area to generate a touch coordinate

Claims (9)

A circular touch screen sensing method is realized by driving a circular touch area with a control circuit, the circular touch area is cut into a virtual square touch area, wherein the virtual square touch area has A plurality of square sensing units, the circular touch area has a circle center, a radius, a middle area and a plurality of side areas, the middle area has a plurality of square electrodes, each of the side areas has at least one non-square electrode, and all The square electrode corresponds to the square sensing unit. The method includes the following steps: performing a touch scanning process on the circular touch area to generate a frame of capacitance value data and greater than one in the frame of capacitance value data A data area of the threshold is set as a touch area, wherein each piece of the capacitance value data in the frame capacitance value data corresponds to a square electrode in the middle area or a one of the side areas Corresponding to the non-square electrode; a coordinate calculation area is defined based on the position of a maximum value of the touch area, the coordinate calculation area has a plurality of sub-areas, the area of the sub-area is the same as the area of the square sensing unit; And determine whether the coordinate calculation area exceeds the virtual square touch area, if not, perform a weighted average calculation on the plurality of capacitance values contained in the plurality of sub-areas to generate a touch coordinate, if yes, then Performing a compensation calculation procedure on the coordinate calculation area to generate a touch coordinate, wherein the compensation calculation procedure includes: setting the corresponding capacitance value of each of the sub-areas located outside the virtual square touch area to 0, and setting Each of the sub-areas located in the virtual square touch area but outside the circular touch area is regarded as a compensation sub-area, and a compensation procedure is performed on each of the compensation sub-areas to fill in a compensation Capacitance value; and performing a weighted average calculation on the plurality of values contained in the plurality of sub-regions of the coordinate calculation area. The method for sensing a round touch screen as described in item 1 of the scope of the patent application, wherein the compensation procedure uses the center of the coordinate calculation area as a search center and a compensation sub-area and the search center The distance is a search radius to form a search track in the circular touch area, and each of the square electrodes or the non-square electrodes located in the search track is used as a reference electrode, and according to at least one An average calculation is performed on the capacitance value data of the reference electrode to generate the compensation capacitance value. The method for sensing a round touch screen as described in item 2 of the patent application scope, wherein when the touch coordinate is located outside the round touch area, the compensation calculation program further includes a boundary coordinate naturalization operation, the boundary The coordinate normalization operation is: x = R * cos( w ), y = R * sin( w ), where w is the angle between the line connecting the touch coordinate and the center of the circle and the X axis of the right-angle coordinate plane, R Is the radius of the circular touch area, and x and y are the horizontal and vertical coordinates of the rectangular coordinate plane, respectively. The method for sensing a round touch screen as described in item 1 of the patent application scope, wherein the control circuit has a processor and a memory unit to execute a program to implement the method for sensing a round touch screen. The method for sensing a round touch screen as described in item 4 of the patent application scope, wherein the memory unit includes a temporary memory, a cache memory or a random access memory. A touch display device has a touch display drive circuit and a touch display panel, wherein the touch display drive circuit is used to drive the touch display panel, and the touch display drive circuit includes the patent application The control circuit of any one of items 1 to 5 to implement the circular touch screen sensing method. The touch display device as described in item 6 of the patent application range, wherein the touch display panel is selected by the group consisting of a liquid crystal touch display panel, an LED touch display panel and an OLED touch display panel A touch display panel. An information processing device having a touch display device as described in item 7 of the patent application scope. The information processing device as described in item 8 of the patent application scope is a device selected by the group consisting of a smart phone, a smart watch, a smart bracelet and a car instrument.

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