TWI806240B - Capacitive touch detection method, capacitive touch chip, touch display device and information processing device - Google Patents

Abstract

A capacitive touch detection method, which includes: recording at least one preliminary qualified touch point among a plurality of sensing points of a capacitive touch plane; Circle an evaluation pane, and calculate the total number of sensing points less than an evaluation threshold in the evaluation pane to obtain an evaluation value; and determine whether the evaluation value of each of the preliminary qualified touch points is greater than the evaluation pane If it is a proportion of the total number of elements, it will be filtered out, if not, it will be regarded as a broadcast point.

Description

Capacitive touch detection method, capacitive touch chip, touch display device and information processing device

The present invention relates to a capacitive touch detection method, in particular to a capacitive touch detection method that can use the sensing values of all sensing points in a pane centered on a preliminary qualified sensing point as the basis for touch judgment. .

Please refer to Fig. 1a and Fig. 1b together, wherein, Fig. 1a depicts a sectional view of a conventional capacitive touch screen, which includes a glass cover layer 11, a transparent adhesive layer 12, a color filter layer 13, A sensing electrode layer 14 and a TFT (thin film transistor; thin film transistor) layer 15; and FIG. 1b shows a structure of the sensing electrode layer 14 of the capacitive touch screen in FIG. 1a, which includes a plurality of sensing electrodes 14a in a matrix.

The working principle of the capacitive touch screen is that there is a basic capacitance between each sensing electrode 14a and the ground, and when a finger presses the glass cover 11, the finger will be on the corresponding basic capacitance of the sensing electrodes 14a. A parallel capacitance is generated. At this time, a capacitance sensing circuit can generate a sensing signal according to a capacitance change value to notify a control circuit.

However, during the actual pressing operation, the sensing electrode layer 14 will be deformed and the sensing electrodes 14a around the pressing area will be lifted, so that the sensing value of the unpressed sensing electrodes 14a will become larger due to the closer distance to the finger. , so that ghost points may be generated (that is, untouched points are determined as touch broadcast points because their sensing values are greater than a predetermined threshold).

In order to solve the above problems, there is an urgent need in the art for a novel adaptive capacitive touch detection method.

The main purpose of the present invention is to disclose a capacitive touch detection method, which can circle an evaluation pane centered on each preliminary qualified touch point in a sensing area, and calculate an evaluation threshold value smaller than an evaluation threshold in the evaluation pane The total number of sensing points is used for judging whether each of the preliminary qualified touch points is a ghost point.

Another object of the present invention is to disclose a capacitive touch chip, which can filter out ghost points by implementing the aforementioned capacitive touch detection method, so as to avoid untouched points being regarded as touched points.

Another object of the present invention is to disclose a touch display device, which can improve the reliability of its touch operation by using the above-mentioned capacitive touch chip.

Another object of the present invention is to disclose an information processing device, which can improve the touch experience of its touch screen by using the above-mentioned capacitive touch chip.

To achieve the aforementioned purpose, a capacitive touch detection method is proposed, which is implemented by a control circuit and includes:

Recording at least one tentatively qualified touch point among a plurality of sensing points of a capacitive touch plane;

An evaluation pane is circled around each of the preliminary qualified touch points in the sensing area, and the total number of sensing points smaller than an evaluation threshold in the evaluation pane is calculated to obtain an evaluation value; and

Judging whether the evaluation value of each preliminary qualified touch point is greater than a proportion of the total number of elements in the evaluation pane, if so, filtering it out, if not, treating it as a broadcast point.

In one embodiment, the preliminary qualified touch point is the sensing point whose sensing value is greater than a sensing threshold.

In one embodiment, the size of the evaluation pane is determined by a sensing range measured by a previously performed light pressing operation.

In one embodiment, the evaluation threshold is the maximum capacitive sensing value within the sensing range of the light press operation.

In one embodiment, the ratio is a real number between 0 and 1.

To achieve the aforementioned purpose, the present invention further proposes a capacitive touch chip, which has a control circuit to perform a capacitive touch detection method, the method comprising:

Recording at least one tentatively qualified touch point among a plurality of sensing points of a capacitive touch plane;

An evaluation pane is circled around each of the preliminary qualified touch points in the sensing area, and the total number of sensing points smaller than an evaluation threshold in the evaluation pane is calculated to obtain an evaluation value; and

Judging whether the evaluation value of each preliminary qualified touch point is greater than a proportion of the total number of elements in the evaluation pane, if so, filtering it out, if not, treating it as a broadcast point.

In one embodiment, the preliminary qualified touch point is the sensing point whose sensing value is greater than a sensing threshold.

In one embodiment, the size of the evaluation pane is determined by a sensing range measured by a previously performed light pressing operation.

In one embodiment, the evaluation threshold is the maximum capacitive sensing value within the sensing range of the light press operation.

In one embodiment, the ratio is a real number between 0 and 1.

To achieve the aforementioned purpose, the present invention further proposes a touch display device, which has a capacitive touch screen and a touch drive circuit for driving the capacitive touch screen, characterized in that: the touch drive circuit has At least one capacitive touch chip as mentioned above.

In one embodiment, the capacitive touch screen has a display module, and the display module can be a liquid crystal display module, a micro light emitting diode display module, a mini light emitting diode display module 1. A quantum dot light-emitting diode display module or an organic light-emitting diode display module.

To achieve the aforementioned purpose, the present invention further proposes an information processing device, which has a central processing unit and the aforementioned touch display device, wherein the central processing unit is used to communicate with the touch display device.

In one embodiment, the capacitive touch screen has a display module, and the display module is composed of a liquid crystal display module, a micro light emitting diode display module, a mini light emitting diode display module A display module selected from the group consisting of a quantum dot light-emitting diode display module and an organic light-emitting diode display module.

In a possible embodiment, the information processing device may be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an access control device.

In order to enable your examiners to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

11: Glass cover layer

12: transparent glue layer

13: Color filter layer

14: Induction electrode layer

14a: Sensing electrode

15: TFT layer

100: Touch display device

110: capacitive touch screen

110a: Touch Sensing Image

110b: touch sensing image

120: Touch drive circuit

121: Capacitive touch chip

121a: control circuit

121b: drive circuit

200: information processing device

210: central processing unit

220: touch display device

Step a: Recording at least one tentatively qualified touch point among a plurality of sensing points of a capacitive touch plane

Step b: in the sensing area, circle an evaluation pane centered on each of the preliminary qualified touch points, and calculate the total number of sensing points less than an evaluation threshold in the evaluation pane to obtain an evaluation value

Step c: judging whether the evaluation value of each of the preliminary qualified touch points is greater than a ratio of the total number of elements in the evaluation pane, if so, it is filtered out, if not, it is regarded as a broadcast point

FIG. 1a shows a cross-sectional view of a conventional capacitive touch screen.

FIG. 1b illustrates a structure of a sensing electrode layer of the capacitive touch screen shown in FIG. 1a.

FIG. 2 is a block diagram of an embodiment of the touch display device of the present invention.

FIG. 3 is a flow chart of an embodiment of the capacitive touch detection method of the present invention.

FIG. 4a illustrates a frame of a touch sensing image with a ghost point.

FIG. 4b shows a frame of the touch sensing image from which the ghost point has been removed, which is generated after the touch sensing image in FIG. 4a is processed by the method of the present invention.

FIG. 5 is a block diagram of an embodiment of an information processing device of the present invention.

Please refer to FIG. 2 , which is a block diagram of an embodiment of the touch display device of the present invention. As shown in FIG. 2, a touch display device 100 has a capacitive touch screen 110 and a touch driving circuit 120 for driving the capacitive touch screen 110, wherein the touch driving circuit 120 has at least one capacitor type touch chip 121, and the capacitive touch chip 121 has a control circuit 121a and a drive circuit 121b. The number of capacitive touch chips 121 is directly proportional to the size of the capacitive touch screen 110 , that is, the larger the size of the capacitive touch screen 110 , the more the number of capacitive touch chips 121 .

The control circuit 121a is used to control the operation of the driving circuit 121b to acquire capacitance sensing values of a plurality of sensing points in a sensing area from the capacitive touch screen 110, and perform a capacitive touch on these capacitance sensing values. control detection procedures, including:

(1) Recording at least one tentatively qualified touch point among a plurality of sensing points in the sensing area, wherein the tentatively qualified touch point is a sensing point whose capacitance sensing value is greater than a sensing threshold;

(2) enclosing an evaluation pane in the sensing area with each preliminary qualified touch point as the center, and calculating the total number of sensing points in the evaluation pane that are less than an evaluation threshold to obtain an evaluation value, Wherein, the size of the evaluation pane is a preset size, which is determined by a sensing range measured by a previously performed light pressing operation, and the evaluation threshold is within the sensing range of the light pressing operation the maximum capacitive sensing value; and

(3) Determine whether the evaluation value of each preliminary qualified touch point is greater than a proportion of the total number of elements in the evaluation pane, if so, filter it out, if not, regard it as a broadcast point.

In detail, assuming that the capacitive sensing value of a preliminary qualified touch point with coordinates (i, j) is a _{i, j} , and i, j are both positive integers, the present invention assigns an evaluation pane to it, and the evaluation A pane can be represented by a matrix A _i,j :

，其中，矩陣A_i,j之大小為(2n+1)*(2k+1)，n,k皆為正整數，且矩陣A_i,j之大小係一事先輕按壓操作所對應之一感應範圍。

, where the size of the matrix A _{i, j} is (2n+1)*(2k+1), n, k are both positive integers, and the size of the matrix A _{i, j} is one of the inductions corresponding to a light press operation in advance scope.

In addition, the evaluation value of the evaluation pane can be expressed as:

C _i,j = count ( a _{p ,q} < Adj )(p= i - n → i + n ; q=jk→j+k), wherein, C _i,j is the evaluation value, representing the matrix A _{i , the total number of (2n+1)*(2k+1) elements of j} that is less than Adj; Adj is the evaluation threshold, which is a preset value, which is the largest capacitance within the sensing range of the previous light pressing operation sensing value.

According to the above setting, the present invention filters out the preliminary qualified touch point when C _i,j is greater than (2n+1)*(2k+1)*r, 0<r<1; when C _i,j is not greater than ( When 2n+1)*(2k+1)*r, the preliminary qualified touch point is regarded as a touch broadcast point. In addition, preferably, r is 0.5.

In addition, the capacitive touch screen 110 can have a display module, and the display module can be a liquid crystal display module, a micro light emitting diode display module, a mini light emitting diode display module, a quantum A dot light emitting diode display module or an organic light emitting diode display module.

According to the above description, the present invention provides a capacitive touch detection method. Please refer to FIG. 3 , which shows a flowchart of an embodiment of a capacitive touch detection method of the present invention, which is implemented by a control circuit. As shown in Figure 3, the method includes: recording at least one preliminary qualified touch point among a plurality of sensing points of a capacitive touch plane (step a); Circle an evaluation pane for each center, and calculate the total number of sensing points less than an evaluation threshold in the evaluation pane to obtain an evaluation value (step b); and determine the evaluation of each of the preliminary qualified touch points Whether the value is greater than a proportion of the total number of elements of the evaluation pane, if so, it is filtered out, if not, it is regarded as a broadcast point (step c).

In step a, the preliminary qualified touch point is the sensing point whose sensing value is greater than a sensing threshold.

In step b, the size of the evaluation pane is a preset size, which is determined by a sensing range measured by a previously performed light pressing operation, and the evaluation threshold is the sensing range of the light pressing operation The maximum capacitive sensing value within.

In step c, said evaluation value of the evaluation pane can be expressed as:

C _i,j = count ( a _{p ,q} < Adj )(p= i - n → i + n ; q=jk→j+k), wherein, C _i,j is the evaluation value, representing the matrix A _{i , the total number of (2n+1)*(2k+1) elements of j} that is less than Adj; Adj is the evaluation threshold, which is a preset value, which is the largest capacitance within the sensing range of the previous light pressing operation sensing value. In addition, the present invention filters out the preliminary qualified touch point when C _i,j is greater than (2n+1)*(2k+1)*r, 0<r<1, preferably, r is 0.5 _{; , When j} is not greater than (2n+1)*(2k+1)*r, the preliminary qualified touch point is regarded as a touch broadcast point.

Please refer to Figures 4a and 4b together, wherein Figure 4a shows a frame of touch sensing image 110a with a ghost point; Figure 4b shows the touch sensing image 110a of Figure 4a being processed by the method of the present invention A frame of the touch-sensing image 110 b from which the ghost point has been removed is generated afterwards.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 5 , which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in Figure 5, an information processing device 200 has a central processing unit 210 and a touch display device 220, wherein the touch display device 220 is realized by the touch display device 100 shown in Figure 2, and the central processing unit 210 is used for communicating with the touch display device 220 . In addition, the information processing device 200 can be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an access control device.

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

1. In the capacitive touch detection method of the present invention, the capacitive touch detection method can circle an evaluation pane centered on each tentatively qualified touch point in a sensing area, and calculate less than one evaluation pane in the evaluation pane. The total number of sensing points of the threshold is used for judging whether each of the preliminary qualified touch points is a ghost point.

2. The capacitive touch chip of the present invention can filter out ghost points by implementing the aforementioned adaptive capacitive touch detection method, so as to avoid untouched points being regarded as touched points.

3. The touch display device of the present invention can improve the reliability of its touch operation through the above-mentioned capacitive touch chip.

4. The information processing device of the present invention can improve the touch experience of its touch screen through the above-mentioned capacitive touch chip.

What is disclosed in this case is a preferred embodiment. For example, any partial changes or modifications derived from the technical ideas of this case and easily deduced by those who are familiar with the technology are within the scope of the patent right of this case.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

Step a: Recording at least one tentatively qualified touch point among a plurality of sensing points of a capacitive touch plane

Step b: in the sensing area, circle an evaluation pane centered on each of the preliminary qualified touch points, and calculate the total number of sensing points less than an evaluation threshold in the evaluation pane to obtain an evaluation value

Step c: judging whether the evaluation value of each of the preliminary qualified touch points is greater than a ratio of the total number of elements in the evaluation pane, if so, it is filtered out, if not, it is regarded as a broadcast point

Claims (9)

A capacitive touch detection method is implemented by a control circuit, which includes: recording at least one preliminary qualified touch point among a plurality of sensing points of a capacitive touch plane; An evaluation pane is circled at the center of each preliminary qualified touch point, and the evaluation pane includes a plurality of sensing points, and the total number of sensing points less than an evaluation threshold in the evaluation pane is calculated to obtain an evaluation value; and judging Whether the evaluation value of each preliminary qualified touch point is greater than a ratio of the total number of elements in the evaluation pane, the ratio is a real number greater than 0 and less than 1, if so, filter it out, if not, filter it out It is regarded as a broadcast point; wherein, the size of the evaluation pane is determined by a sensing range measured by a light pressing operation performed in advance, and the evaluation threshold is the maximum capacitance within the sensing range of the light pressing operation sensing value. The capacitive touch detection method described in item 1 of the scope of the patent application, wherein the preliminary qualified touch point is the sensing point whose sensing value is greater than a sensing threshold. A capacitive touch chip, with a control circuit to perform a capacitive touch detection method, the method includes: recording at least one tentatively qualified touch point among a plurality of sensing points of a capacitive touch plane; An evaluation pane is circled around each preliminary qualified touch point in the measurement area, the evaluation pane contains a plurality of sensing points, and the total number of sensing points less than an evaluation threshold in the evaluation pane is calculated to obtaining an evaluation value; and judging whether the evaluation value of each of the preliminary qualified touch points is greater than a ratio of the total number of elements in the evaluation pane, the ratio is a real number greater than 0 and less than 1, and if so, filtering it out , if not, it is regarded as a broadcast point; wherein, the size of the evaluation pane is determined by a sensing range measured by a light press operation performed in advance, and the evaluation threshold is the value of the light press operation The maximum capacitive sensing value within the sensing range. The capacitive touch chip according to claim 3 of the patent application, wherein the preliminary qualified touch point is the sensing point whose sensing value is greater than a sensing threshold. A touch display device having a capacitive touch screen and a touch drive circuit for driving the capacitive touch screen, characterized in that: the touch drive circuit has at least one such as the 3rd to the patent scope of the application The capacitive touch chip described in any one of item 4. The touch display device as described in Item 5 of the scope of the patent application, wherein the capacitive touch screen has a display module, and the display module is composed of a liquid crystal display module and a micro light emitting diode display module 1. A display module selected from the group consisting of a mini light-emitting diode display module, a quantum dot light-emitting diode display module and an organic light-emitting diode display module. An information processing device has a central processing unit and the touch display device as described in item 5 of the scope of the patent application, wherein the central processing unit is used to communicate with the touch display device. The information processing device as described in item 7 of the scope of the patent application, wherein the capacitive touch screen has a display module, and the display module is composed of a liquid crystal display module and a micro light emitting diode display module 1. A display module selected from the group consisting of a mini light-emitting diode display module, a quantum dot light-emitting diode display module and an organic light-emitting diode display module. The information processing device described in item 7 of the scope of the patent application is one selected from the group consisting of a smart phone, a portable computer, a vehicle-mounted computer, a wearable electronic device and an access control device device.

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