CN102023767A - Method for improving edge positioning of capacitive touch panel - Google Patents

Abstract

A method for improving edge positioning of a capacitive touchpad, the capacitive touchpad having a plurality of physical sensing lines in a direction, one of the plurality of physical sensing lines being an edge sensing line, the plurality of physical sensing lines having respective coordinates, the method comprising: obtaining the induction quantity of the plurality of entity induction lines; defining a virtual induction line on the outer side of the edge induction line, and giving a virtual coordinate and a virtual induction quantity; calculating the average induction quantity and the coordinate intermediate value of any two adjacent induction lines of the plurality of entity induction lines and the virtual induction line; and determining the coordinate in the direction by interpolation operation from the average induction quantity and the coordinate intermediate value. The method for improving the edge positioning of the capacitive touch pad has the advantage of eliminating dead angle intervals.

Description

Methods to improve edge positioning of capacitive touchpads

technical field

The invention relates to a capacitive touch panel, in particular to a method for improving edge positioning of the capacitive touch panel. the

Background technique

As shown in FIG. 1 , the capacitive touch panel 10 has a plurality of sensing lines 14, 16, 18, 20 and 22 in the X direction from its edge 12 to the right. The center position of each sensing line is its coordinate X _m , and the coordinate X _m can be a relative coordinate or an absolute coordinate. When an object is touched, the capacitance value of the touched sensing line will change, and the capacitance value of each sensing line 14, 16, 18, 20, and 22 will be converted by a converter (not shown in the figure) to produce different values of sensing The amount C _m is calculated from the coordinates X _m of each induction line 14, 16, 18, 20 and 22 and the inner difference operation of the induction amount C _m to locate the coordinates of the object

$x=\underset{m=1}{\overset{\mathrm{no}}{\mathrm{\Σ}}}(x_m\×C_m)/\underset{m=1}{\overset{\mathrm{no}}{\mathrm{\Σ}}}{C}_m,$ [Formula 1]

Wherein, n is the number of induction lines. However, this method can only locate objects in the interval 24. If the scope of use is extended to the position of the edge 12 due to hardware, the coordinates X _m of the sensing lines 14, 16, 18, 20 and 22 are all defined in the position of the edge 12. Therefore, as long as the object exceeds the central position X ₁ of the edge sensing line 14 near the edge 12 of the touch panel 10 , it cannot be positioned, thus forming a dead angle. For example, the interval 26 in FIG. 1 is a dead angle that cannot be positioned. There will be such dead spots at each edge of any touch panel, and the user cannot use any edge section such as section 26 .

Therefore, there are above-mentioned inconveniences and problems in the known touch panel. the

Contents of the invention

The purpose of the present invention is to provide a method for improving the edge positioning of a capacitive touch panel. the

For realizing the above object, technical solution of the present invention is:

A method for improving edge positioning of a capacitive touch panel, the capacitive touch panel has a plurality of physical sensing lines in one direction, one of the plurality of physical sensing lines is an edge sensing line, and the plurality of physical sensing lines The induction lines have respective coordinates, characterized in that the method comprises the following steps:

The first step: obtaining the sensing values of the plurality of physical sensing lines;

The second step: define a virtual sensing line outside the edge sensing line, and give virtual coordinates and virtual sensing values;

The third step: calculating the average sensing amount and coordinate intermediate value of any two adjacent sensing lines of the plurality of physical sensing lines and the virtual sensing line; and

Step 4: Determine the coordinates in the direction by interpolating from the average sensing value and the intermediate value of the coordinates. the

The method for improving the edge positioning of the capacitive touch panel of the present invention can also be further realized by adopting the following technical measures. the

The aforementioned method, wherein the virtual sensing quantity is zero. the

The aforementioned method, wherein the virtual sensing quantity is a non-zero fixed value. the

The aforementioned method, wherein the virtual sensing quantity is a variable related to the sensing quantities of the plurality of physical sensing lines. the

After adopting the above technical solution, the method for improving the edge positioning of the capacitive touch panel of the present invention has the advantage of eliminating the dead zone. the

Description of drawings

The schematic diagram of the positioning method of the known capacitive touch panel of Fig. 1;

Fig. 2 is the schematic diagram of the positioning method of the capacitive touch panel of the present invention;

Fig. 3 is a flow chart of the positioning method of the present invention. the

In the figure, 10, capacitive touch panel 12, touch panel edge 14, sensing line 16, sensing line 18, sensing line 20, sensing line 22, sensing line 24, positionable interval 26, dead zone interval 28, virtual sensing line 30. The interval can be positioned. the

Detailed ways

The present invention will be further described below in conjunction with embodiment and accompanying drawing. the

Please refer to FIG. 2 , which is a schematic diagram of the positioning method of the capacitive touch panel of the present invention. As shown in the figure, a virtual sensing line 28 in the X direction is defined outside the edge sensing line 14 of the capacitive touch panel 10 and given a virtual coordinate X ₀ . When an object is touched, the capacitance value of the touched physical sensing line will change, and the capacitance value of each sensing line 14, 16, 18, 20, and 22 will be converted by a converter (not shown in the figure) to produce different values The sensing value C _m is given by the virtual sensing line 28 , and the virtual sensing value C ₀ is preset to 0 in this embodiment. In order to locate the coordinate X of the object, first obtain the middle value X′ _m =(X _m +X _m+1 )/2 of the coordinates of any two adjacent induction lines and the average value C′ _m =( C _m +C _m+1 )/2, the coordinates X ₀ ', X ₁ ', X ₂ ', X ₃ ' and X ₄ ' and the inductance C ₀ ', C ₁ ', C ₂ marked in Figure 2 ', C ₃ ' and C ₄ ', and then use the coordinates of the interpolation operation object

$x=\underset{m=0}{\overset{\mathrm{no}-1}{\mathrm{\Σ}}}({x^{\′}}_m\×{C^{\′}}_m)/\underset{m=0}{\overset{\mathrm{no}-1}{\mathrm{\Σ}}}{C^{\′}}_m,$ [Formula 2]

Wherein, n is the number of induction lines. Using this positioning method, positioning can be performed within the section 30, thus eliminating the dead zone section 26 in FIG. 1 . the

Fig. 3 is the flow chart of the above positioning method, step S1 obtains the inductive quantities C ₁ , C ₂ , C ₃ , C ₄ and C ₅ of the physical induction lines 14, 16, 18, 20 and 22 in the X direction, and step S2 defines the virtual The sensing line 28 is on the outside of the edge sensing line 14 in the X direction, and has virtual coordinates and a virtual sensing value. The virtual sensing value can be zero, a non-zero fixed value or the same as the sensing value C ₁ , C ₂ , C ₃ , C ₄ and C ₅ related variables, step S3 calculates the average induction of any two adjacent induction lines C ₀ ′, C ₁ ′, C ₂ ′, C ₃ ′ and C ₄ ′ and its coordinate intermediate value X ₀ ′ _{. _ _ _ _ _ _ _ _ _} X ₁ ′, X ₂ ′, X ₃ ′, and X ₄ ′ are interpolated to determine the coordinates of the object in the X direction.

The locating method of the present invention can be used together with known locating methods, and when sensing that the sensing amount of the edge sensing line 14 is not zero or is the maximum value of the sensing amounts of each sensing line, the positioning method of the present invention is used to locate The coordinates of the object. the

The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can make various transformations or changes without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the category of the present invention and should be defined by each claim. the

Claims (4)

1. A method for improving edge positioning of a capacitive touch panel, the capacitive touch panel has a plurality of physical sensing lines in one direction, one of the plurality of physical sensing lines is an edge sensing line, and the plurality of physical sensing lines The physical induction lines have respective coordinates, and it is characterized in that the method comprises the following steps: Step 1: Obtain the sensing values of the plurality of physical sensing lines; The second step: defining a virtual sensing line outside the edge sensing line, and giving virtual coordinates and virtual sensing values; The third step: calculating the average sensing amount and coordinate intermediate value of any two adjacent sensing lines of the plurality of physical sensing lines and the virtual sensing line; and Step 4: Determine the coordinates in the direction by interpolating from the average sensing value and the intermediate value of the coordinates. 2. The method according to claim 1, characterized in that the virtual sensing quantity is zero. 3. The method according to claim 1, wherein the virtual sensing quantity is a non-zero fixed value. 4. The method according to claim 1, wherein the virtual sensing quantity is a variable related to the sensing quantities of the plurality of physical sensing lines.

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