CN102023767A - Improvement method for capacitive touch pad edge positioning - Google Patents

Abstract

The present invention relates to an improvement method for capacitive touch pad edge positioning, the capacitive touch pad possesses a plurality of tangible induction lines in one direction; one of the plurality of tangible induction lines is an edge induction line; the plurality of tangible induction lines possess respective coordinates; the method is characterized by comprising following steps: obtaining induction amounts of the plurality of tangible induction lines; defining virtual induction lines at the external sides of the edge induction lines, and giving virtual coordinates and virtual induction amounts to the virtual induction lines; calculating average induction amounts of two random adjacent induction lines and coordinate medians of the plurality of tangible induction lines and the plurality of virtual induction lines; determining the coordinate in the direction by interpolation operation of the average induction amounts and the coordinate medians. The improvement method for capacitive touch pad edge positioning provided by the invention has the advantages in that blind angle regions can be eliminated.

Description

Improve the method for capacitance touching control panel edges location

Technical field

The present invention relates to a kind of capacitive touch control plate, specifically, is a kind of method of improving capacitance touching control panel edges location.

Background technology

As shown in Figure 1, capacitive touch control plate 10 is turned right from its edge 12 and is had a plurality of lines of induction 14,16,18,20 and 22 of directions X, and the center of each line of induction is its coordinate X _m, coordinate X _mCan be relative coordinate or absolute coordinates.When object is touched, the capacitance of the touched line of induction will change, and each line of induction 14,16,18,20 and 22 capacitance produce the induction amount C of different numerical value via converter (not shown) conversion back _m, from the coordinate X of each line of induction 14,16,18,20 and 22 _mAnd induction amount C _mInterior difference operation is oriented the coordinate of object

$X=\underset{m=1}{\overset{n}{\mathrm{\Σ}}}(X_m\×C_m)/\underset{m=1}{\overset{n}{\mathrm{\Σ}}}{C}_m,$ [formula 1]

Wherein, n is the quantity of the line of induction.But the method can only be positioned at the object in interval 24, if because the cause of hardware extends to the position at edge 12 with usable range, then because the coordinate X of each line of induction 14,16,18,20 and 22 _mAll be defined in its center, therefore as long as object surpasses the center X of the edge line of induction 14 near the edge 12 of Trackpad 10 ₁, just can't locate, thereby form the dead angle it, for example the interval among Fig. 1 26 is the dead angle that can't locate.Each edge of any Trackpad all has this class dead angle and produces, and the user can't use the arbitrary edge interval as interval 26.

Therefore known Trackpad exists above-mentioned all inconvenience and problem.

Summary of the invention

Purpose of the present invention is to propose a kind of method of improving capacitance touching control panel edges location.

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

A kind of method of improving capacitance touching control panel edges location, described capacitive touch control plate has a plurality of entity lines of induction on the direction, one in described a plurality of entity lines of induction is the edge line of induction, described a plurality of entity lines of induction have coordinate separately, it is characterized in that said method comprising the steps of:

First step: the induction amount that obtains described a plurality of entity lines of induction;

Second step:, and give virtual coordinates and virtual induction amount in the outside of the described edge line of induction defining virtual line of induction;

Third step: average induction amount and the coordinate intermediate value of calculating described a plurality of entity lines of induction and wantonly two the adjacent lines of induction of the described virtual line of induction; And

The 4th step: determine coordinate on the described direction from described average induction amount and described coordinate intermediate value interpolative operation.

The method of improving capacitance touching control panel edges location of the present invention can also be further achieved by the following technical measures.

Aforesaid method, wherein said virtual induction amount are zero.

Aforesaid method, the definite value that wherein said virtual induction amount is a non-zero.

Aforesaid method, wherein said virtual induction amount is the parameter relevant with the induction amount of described a plurality of entity lines of induction.

After adopting technique scheme, the method for improving capacitance touching control panel edges location of the present invention has the advantage of eliminating between dead angle area.

Description of drawings

The localization method synoptic diagram of Fig. 1 known capacitance formula Trackpad;

Fig. 2 is the localization method synoptic diagram of capacitive touch control plate of the present invention;

Fig. 3 is the process flow diagram of localization method of the present invention.

Among the figure, but but 10, between capacitive touch control plate 12, Trackpad edge 14, the line of induction 16, the line of induction 18, the line of induction 20, the line of induction 22, the line of induction 24 positioning areas 26, between dead angle area 28, between the virtual line of induction 30 positioning areas.

Embodiment

Below in conjunction with embodiment and accompanying drawing thereof the present invention is illustrated further.

Now see also Fig. 2, Fig. 2 is the localization method synoptic diagram of capacitive touch control plate of the present invention.As shown in the figure, at the virtual line of induction 28 of the outside of the edge of described capacitive touch control plate 10 line of induction 14 definition directions X, and give virtual coordinates X ₀When object is touched, the capacitance of the touched entity line of induction will change, and each line of induction 14,16,18,20 and 22 capacitance produce the induction amount C of different numerical value via converter (not shown) conversion back _m, the virtual line of induction 28 then gives virtual induction amount C ₀, this embodiment is preset as 0 with it.In order to orient the coordinate X of described object, obtain the intermediate value X ' of wantonly two adjacent line of induction coordinates earlier _m=(X _m+ X _M+1The mean value C ' of)/2 and induction amount thereof _m=(C _m+ C _M+1)/2 are as the coordinate X that indicates among Fig. 2 ₀', X ₁', X ₂', X ₃' and X ₄' and induction amount C ₀', C ₁', C ₂', C ₃' and C ₄', again with interpolation operand coordinate

$X=\underset{m=0}{\overset{n-1}{\mathrm{\Σ}}}({X^{\′}}_m\×{C^{\′}}_m)/\underset{m=0}{\overset{n-1}{\mathrm{\Σ}}}{C^{\′}}_m,$ [formula 2]

Wherein, n is the quantity of the line of induction.Use this localization method, all can locate in interval 30, therefore eliminated between the dead angle area among Fig. 1 26.

Fig. 3 is the process flow diagram of above-mentioned localization method, and step S1 obtains the induction amount C of the entity line of induction 14,16,18,20 on the directions X and 22 ₁, C ₂, C ₃, C ₄And C ₅, the step S2 defining virtual line of induction 28 is in the outside of the edge of the directions X line of induction 14, it has virtual coordinates and virtual induction amount, described virtual induction amount can be for zero, the definite value of non-zero or with induction amount C ₁, C ₂, C ₃, C ₄And C ₅Relevant variable, step S3 calculates the average induction amount C of wantonly two adjacent lines of induction ₀', C ₁', C ₂', C ₃' and C ₄' and coordinate intermediate value X ₀', X ₁', X ₂', X ₃' and X ₄', step S4 is from average induction amount C ₀', C ₁', C ₂', C ₃' and C ₄' and coordinate intermediate value X ₀', X ₁', X ₂', X ₃' and X ₄' interpolative operation and determine the coordinate of object on the directions X.

Localization method of the present invention can use with known localization method, and is non-vanishing or during for the maximal value of each line of induction induction amount when the induction amount that senses the edge line of induction 14, just uses localization method of the present invention to locate the coordinate of described object.

Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.

Claims (4)

1. one kind is improved the method that the capacitance touching control panel edges is located, described capacitive touch control plate has a plurality of entity lines of induction on the direction, one in described a plurality of entity lines of induction is the edge line of induction, described a plurality of entity lines of induction have coordinate separately, it is characterized in that said method comprising the steps of:

First step: the induction amount that obtains described a plurality of entity lines of induction;

Second step:, and give virtual coordinates and virtual induction amount in the outside of the described edge line of induction defining virtual line of induction;

Third step: average induction amount and the coordinate intermediate value of calculating described a plurality of entity lines of induction and wantonly two the adjacent lines of induction of the described virtual line of induction; And

The 4th step: determine coordinate on the described direction from described average induction amount and described coordinate intermediate value interpolative operation.

2. the method for claim 1 is characterized in that, described virtual induction amount is zero.

3. the method for claim 1 is characterized in that, the definite value that described virtual induction amount is a non-zero.

4. the method for claim 1 is characterized in that, described virtual induction amount is the parameter relevant with the induction amount of described a plurality of entity lines of induction.

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