CN104391616B - Method and device for acquiring pixel point capacitance detecting range of touch screens - Google Patents
Method and device for acquiring pixel point capacitance detecting range of touch screens Download PDFInfo
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- CN104391616B CN104391616B CN201410707089.5A CN201410707089A CN104391616B CN 104391616 B CN104391616 B CN 104391616B CN 201410707089 A CN201410707089 A CN 201410707089A CN 104391616 B CN104391616 B CN 104391616B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention discloses a method and a device for acquiring a pixel point capacitance detecting range of touch screens. The method comprises the following steps of acquiring the capacitance of each pixel point of N touch screens; calculating a capacitance mean value and variance of pixel points at the same ith positions on the N touch screens so as to acquire a pixel point capacitance reference range at the ith position; judging whether the capacitance of NxM pixel points on the N touch screen is in the pixel point capacitance reference range of positions corresponding to the NxM pixel points or not; and setting the pixel point capacitance reference range of the ith position as a pixel point capacitance detecting range of a corresponding position when the capacitance of an optional pixel point on an optional touch screen is in the pixel point capacitance reference range of the corresponding position. Each touch screen is provided with M pixel points, the M is an integer greater than 0, the N is a positive integer, and i equals to 1, 2, ..., (M-1) or M. By the method and the device, the problems of false judgment and over judgment on detection of the capacitance in the prior art are solved.
Description
Technical field
The present invention relates to touch screen detection technique, more particularly to a kind of pixel capacitance detection range of touch screen is obtained
Method and apparatus is taken, and the touch screen detected to touch screen according to the pixel capacitance detection range of touch screen is detected
Method.
Background technology
As digital Age arrives, touch screen is widely used in handheld electric products, increasing mobile phone, flat board
The products such as computer are using capacitive touch screen as display screen.Capacitive touch screen is to carry out work using the electric current sensing of human body
Make, when finger touch mode capacitive touch screen, by the change of electric current on touch screen, draw touch point position.In capacitive touch
During touching the manufacturing of screen, needs are detected to manufactured capacitive touch screen, so as to select out qualified touch
Screen, wherein, qualified touch screen refers to each pixel (pixel) is put on the touch screen capacitance within the normal range, because
This detection whether qualified process of touch screen is the process detected to touch screen each pixel.
The content of the invention
The detection method of the mutual capacitance touchscreens that prior art is provided, first by checking capacitance graphics random collecting
At least the capacitance value data of 30 qualified touch screens, secondly calculates 30 touch screens of the pixel for each pixel
Condenser paper average, finally according to experience or chip supplier's suggestion, by the electric capacity upper lower limit value of each pixel of full wafer touch screen
(limit) be set as a certain identical value, be normally set up the limit be pixel condenser paper average ± 20%, thus full wafer touch
Touch screen each pixel capacitance detection range setting to complete.According to the limit values of setting, any a piece of touch screen is examined
Survey, when the capacitance of full wafer touch screen any one pixel fluctuates ± the 20% of its corresponding pixel condenser paper average
Within the scope of, then judge that the touch screen is qualified touch screen, if the capacitance of at least one pixel of full wafer touch screen exceeds
± 20% fluctuation range of its pixel condenser paper average, then judge that the touch screen is unqualified touch screen.
As can be seen that first, the actual capacitance fluctuation range of each pixel of touch screen is not fully identical, therefore works as
Phenomenon of sentencing or fail to judge can be produced when detecting with identical limit to each pixel.With MOTO4.3qHD in Shanghai module
As a example by the Limit of section, the limit is set to ± 25%, and the capacitance fluctuation detected at certain piece T3R8 is -24.816%, should
Pixel is considered as qualified point, but is illustrated in figure 1 the actual capacitance graphics of the touch screen, and this point should be regarded as bad as seen from the figure
Point (NG) point, thus illustrates that Limit set in advance can cause to fail to judge for 25%；Secondly, it is true by checking capacitance graphics
When fixed certain touch screen is certified products or substandard products, due to carrying larger subjectivity, therefore everyone judgement knot is not ensured that
It is really identical；Finally, in prior art, accurate touch screen capacitance Limit needs just to can determine that through complicated experimental verification, consumes
Take manpower and materials larger.
In view of this, the present invention provides a kind of acquisition methods of the pixel capacitance detection range of touch screen and device,
To solve problem of the prior art.
In a first aspect, a kind of acquisition methods of the pixel capacitance detection range of touch screen of present invention offer, the party
Method includes：
Step one, the capacitance for obtaining each pixel of touch screen described in N pieces, wherein, per a piece of touch screen
With the M pixel, M is the integer more than 0, and N is positive integer；
The capacitance average of the pixel of i-th position of identical and side on step 2, touch screen described in calculating N pieces
Difference, to obtain the pixel capacitance term of reference of i-th position, wherein, i=1,2 ..., M-1, M；
Whether step 3, the capacitance of the N*M pixel judged on touch screen described in N pieces are in its correspondence position
In pixel capacitance term of reference；
Step 4, when the capacitance of any 1 pixel judged on any 1 touch screen is in its correspondence
The pixel capacitance term of reference conduct of i-th position, in the pixel capacitance term of reference of position, is set
The pixel capacitance detection range of correspondence position.
Further, calculate described in N pieces on touch screen the capacitance average of the pixel of i-th position of identical and
Variance, to obtain the pixel capacitance term of reference of i-th position, specifically includes：
The capacitance of the pixel of i-th position of identical on the touch screen according to N pieces, calculates i-th position
The capacitance average of pixel and variance；
According to the capacitance average and variance of i-th position pixel, i-th position is calculated according to equation below
Pixel capacitance term of reference：
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is institute
The upper limit of the pixel capacitance term of reference of i-th position is stated, μ _ i is the capacitance average of i-th position pixel,
δ _ i is the capacitance variance of i-th position pixel, and cpk is process capability parameter.
Further, process capability parameter cpk is specially：2≥cpk≥1.67.
Further, the picture described at least one in step 3 judges the N*M pixel on touch screen described in N pieces
The capacitance of vegetarian refreshments not in the pixel capacitance term of reference of its correspondence position when, the method also includes：
When the electric capacity of one or more pixels on any 1 touch screen in touch screen described in judgement L pieces
Pixel capacitance term of reference of the value beyond its correspondence position, from the capacitance of the pixel of touch screen described in the N pieces for obtaining
The capacitance of the middle pixel for removing the touch screen described in L pieces, wherein, L is integer and N >=L>0；
Return to step one, works as N>L>The capacitance that the step one is currently obtained when 0 is the every of touch screen described in remaining N-L pieces
The capacitance of one pixel, as N=L, the step one reacquires the electric capacity of each pixel of X piece touch screens
Described in value and the X pieces that currently obtain, touch screen is other touch screens described in X pieces outside touch screen described in N pieces, and is held successively
Row step one is to step 4.
Further, the capacitance of acquisition each pixel of touch screen described in N pieces specially at least obtains 30
The capacitance of each pixel of touch screen described in piece.
Second aspect, a kind of detection method of touch screen that the present invention is provided, the method include：
The pixel capacitance detection range of the touch screen is obtained using the acquisition methods described in first aspect；
The capacitance of each pixel of the touch screen is obtained, wherein, the touch screen has K pixel, and K is
Integer more than 0；
Judge whether the capacitance of j-th pixel of the touch screen detects model in its correspondence position pixel capacitance
In enclosing, wherein, j=1,2 ..., K-1, K；
When the touch screen each pixel capacitance in its correspondence position pixel capacitance detection range
It is interior, judge that the touch screen is qualified touch screen, or
When the capacitance of at least one pixel of the touch screen does not detect model in its correspondence position pixel capacitance
In enclosing, judge that the touch screen is unqualified touch screen.
The third aspect, the invention provides a kind of acquisition device of the pixel capacitance detection range of touch screen, the dress
Put including：
Capacitance acquisition module, it is for obtaining the capacitance of each pixel of touch screen described in N pieces, wherein, each
Touch screen described in piece has the M pixel, and M is the integer more than 0, and N is positive integer；
Computing module, the capacitance for calculating the pixel of i-th position of identical on touch screen described in N pieces are equal
Value and variance, to obtain the pixel capacitance term of reference of i-th position, wherein, i=1,2 ..., M-1, M；
Whether judge module, for judging the capacitance of the N*M on touch screen described in the N pieces pixel in its correspondence
In the pixel capacitance term of reference of position；
Setup module, for existing when the capacitance of any 1 pixel judged on any 1 touch screen
In the pixel capacitance term of reference of its correspondence position, the pixel capacitance for arranging i-th position refers to model
Enclose the pixel capacitance detection range as correspondence position.
Further, the computing module includes：
First computing unit, for the electric capacity of the pixel of i-th position of identical on the touch screen according to N pieces
Value, calculates the capacitance average and variance of i-th position pixel；
Second computing unit, for capacitance average and variance according to i-th position pixel, according to following public affairs
Formula calculates the pixel capacitance term of reference of i-th position：
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is institute
The upper limit of the pixel capacitance term of reference of i-th position is stated, μ _ i is the capacitance average of i-th position pixel,
δ _ i is the capacitance variance of i-th position pixel, and cpk is process capability parameter.
Further, process capability parameter cpk is specially：2≥cpk≥1.67.
Further, at least one in the judge module judges the N*M pixel on touch screen described in N pieces
The capacitance of the pixel not in the pixel capacitance term of reference of its correspondence position when, the device also includes：
Module is removed, for when one or more institutes on any 1 touch screen judged in touch screen described in L pieces
The pixel capacitance term of reference of the capacitance beyond its correspondence position of pixel is stated, from touch screen described in the N pieces for obtaining
The capacitance of the pixel of the touch screen described in L pieces is removed in the capacitance of pixel, and wherein, L is integer and N >=L>0；
Module is returned, for returning the capacitance acquisition module, works as N>L>When 0, the capacitance acquisition module is currently obtained
The capacitance for taking is the capacitance of each pixel of touch screen described in remaining N-L pieces, the capacitance as N=L
Touch screen described in the X pieces that acquisition module reacquires the capacitance of each pixel of X piece touch screens and currently obtains is N
Other touch screens described in X pieces outside touch screen described in piece, and computing module, judge module and setup module is performed successively.
Further, the capacitance acquisition module specially at least obtains each pixel of 30 touch screens
Capacitance.
A kind of acquisition methods and device of the pixel capacitance detection range of touch screen that the present invention is provided, according to acquisition
Touch screen pixel capacitance, calculate average and variance, to draw pixel capacitance term of reference, and by pixel electricity
Capacitance is compared with the pixel capacitance term of reference of correspondence position, whether knows the pixel as certified products with this, only
There is the capacitance of each pixel when acquired touch screen in its correspondence position pixel capacitance term of reference,
Correspondence position pixel capacitance term of reference is set to into correspondence position pixel capacitance detection range, by pixel electricity
Capacitance detection range is detected to other any touch screens.The present invention is without the need for by checking that graphics determine that whether touch screen is
Certified products, solve the problems, such as to judge subjectivity between different people, secondly individually set detection range for each pixel, solve
Different pixels of having determined point capacitance fluctuates different problem, finally needs not move through complex experiment when technological parameter changes
Determine corresponding capacitance value fluctuation bound, need to only collect the capacitance value data of current touch screen, the method provided using the present invention
And/or device can be calculated, computational methods of the present invention are simple, do not result in fail to judge or cross and sentence, solve prior art picture
What vegetarian refreshments capacitance detection bound was present fails to judge, crosses and sentence problem.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description does one and simply introduces, it should be apparent that, drawings in the following description are these
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Actual capacitance graphics of the Fig. 1 for MOTO4.3qHD touch screens；
The scattergram of the pixel capacitance of 102 qualified touch screens that Fig. 2 is provided for the present invention；
Fig. 3 is a kind of acquisition methods of the pixel capacitance detection range of touch screen that the embodiment of the present invention one is provided
Flow chart；
Fig. 4 is a kind of acquisition device of the pixel capacitance detection range of touch screen that the embodiment of the present invention three is provided
Schematic diagram.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter with reference to the embodiment of the present invention in it is attached
Figure, clearly and completely describes technical scheme by embodiment, it is clear that described embodiment is the present invention one
Section Example, rather than the embodiment of whole.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
The every other embodiment obtained under the premise of going out creative work, belongs to the scope of protection of the invention.
With reference to Fig. 2, the scattergram of the pixel capacitance of the 102 qualified touch screens provided for the present invention is proposing this
Before the technical scheme of invention, staff has counted the capacitance value data of at least 102 qualified touch screens, empirical tests touch screen
Each equal Normal Distribution of pixel capacitance, Fig. 2 be fitting after each pixel capacitance the regularity of distribution,
Wherein, the longitudinal axis represents probability density, and transverse axis represents pixel capacitance, it follows that the electricity of each pixel of qualified touch screen
Capacitance should be distributed in a certain scope on the basis of central value (0.36), therefore is based on process capability parameter (CPK, Complex
Process Capability index) arranging incomplete same limit to each pixel could be to arbitrarily touching
Touch screen to cause to sentence, fail to judge problem.CPK is used for representing process capability that reflect the height of process yield, CPK to be bigger, processing procedure
Ability could be higher, can produce the high product of good quality, reliability.
Embodiment one
With reference to Fig. 3, it is a kind of acquisition of the pixel capacitance detection range of touch screen that the embodiment of the present invention one is provided
The flow chart of method.The technical scheme of the present embodiment is suitable for the capacitance inspection based on each pixel of round-robin algorithm acquisition touch screen
Scope is surveyed, with to the identical arbitrarily situation detected by a piece of touch screen.Should be detected based on the pixel capacitance of round-robin algorithm
Scope acquisition methods be using the operational speed of a computer it is fast, be adapted to the characteristics of doing repetitive operation, to certain step, (or one group refer to
Make) repeated, when these steps (or this group instruction) is performed every time, all its one is released from the initial value of variable new
Value.The method can be performed by the acquisition device of the pixel capacitance detection range of touch screen, and the device can be adopted
The mode of software and/or hardware realizes that configuration is performed in a computer.
As shown in figure 3, the method is comprised the following steps：
Step 110, the capacitance for obtaining each pixel of touch screen described in N pieces, wherein, per a piece of touch screen
With the M pixel, M is the integer more than 0, and N is positive integer.
As described above, pixel English is Pixel, Picture element are called, pixel has storage capacitance, when
During pixel output data, may require that in the storage capacitance of data elder generation writing pixel point first, wait until that write cycle terminates, also
After i.e. data are charged to storage capacitance with form of electrical charges, pixel starts view data is presented, and comes from the angle of computer technology
Explain, pixel refers to the least unit showed on the picture of display screen.Each touch screen has multiple pixels, obtains
The capacitance of touch screen is to obtain the capacitance on touch screen in the storage capacitance of each pixel, here, setting is touched
Screen is with the M pixel for arranging in the form of an array.
Preferably, the capacitance of acquisition each pixel of touch screen described in N pieces specially at least obtains 30
The capacitance of each pixel of the touch screen.
As described above, the pixel sum of any a piece of touch screen is same position on M, and touch screen in N piece touch screens
Each there is a pixel.When N at least 30 are set, random collecting at least each pixel of 30 touch screens
Capacitance, accordingly, that is, obtains the capacitance of 30*M pixel, here, without the concern for the capacitance of each pixel being
No exception, it is not required that consider whether touch screen is certified products, and the product touch screen off quality such as failure, short circuit or non-burning
Or non-similar touch screen then should not be used as target touch screen.
This step 110 only needs the random capacitance value data for obtaining at least N pieces normal touch screen, compared with prior art, no
Need by checking that capacitance graphics determine that whether qualified pixel distribution of capacitance values is, thus ensure that will not be according to personal subjective
Property there are different judgement testing results, make the pixel capacitance detection range of follow-up acquisition accurate.
Step 120, calculate described in N pieces on touch screen the capacitance average of the pixel of i-th position of identical and
Variance, to obtain the pixel capacitance term of reference of i-th position, wherein, i=1,2 ..., M-1, M.
As described above, average (average) is the amount number of the trend in a group data set that represents, be one group of data and divided by
Business obtained by the number of this group of data, in statistical work, average describes data information central tendency and dispersion degree, also retouches
A statistic of data concentrated position is stated.Variance be each data respectively with the difference of its average square and it is average
Number, for measuring the departure degree between stochastic variable and its mathematic expectaion (average), in statistical work, variance describes number
According to off-centered degree, the fluctuation size of data is weighed, variance is bigger, illustrates that data fluctuations are bigger, more unstable.
Here, calculating the average and variance of the pixel capacitance of same position on N piece touch screens, then mutually can should be appreciated that tactile
Touch the capacitance fluctuation size and stability of the pixel of screen same position.Need to obtain each on touch screen successively in this step
The average and method of the pixel of individual same position, here, the corresponding pixel number of each same position is N, accordingly may be used
Obtain N number of capacitance value data.
For step 120, the preferred embodiment of here is specifically included：
The capacitance of the pixel of i-th position of identical on step 121, the touch screen according to N pieces, calculates the
The capacitance average of i position pixel and variance.
It is known in step 110, obtain the capacitance of each pixel of N piece touch screens, in this step, need pin
Corresponding average and variance are calculated to the pixel capacitance of i-th position of identical on N piece touch screens, here, touching with N pieces
On screen as a example by the 1st position of identical, the identical of N piece touch screens is extracted from the N*M pixel capacitance value data for obtaining
The 1st position pixel capacitance, thus can extract out N number of pixel capacitance.
The pixel capacitance of the 1st position of identical on the N piece touch screens for extracting is labeled as x by here successively1、x2、
x3、…、xN-2、xN-1、xN, the pixel capacitance average of the 1st position is labeled as μ _ 1, and variance is labeled as δ _ 1, then N pieces are touched
On screen, the pixel capacitance average and variance of the 1st position of identical is calculated according to below equation (1) and (2)：
The pixel capacitance average of the 1st position of identical and side on N piece touch screens are calculated according to above-mentioned formula
Difference, the like, according to average and formula of variance, accordingly calculate the picture of other i-th position of identical on N piece touch screens
Vegetarian refreshments capacitance average and variance, wherein, i=1,2 ..., M-1, M, then the average of each position can be labeled as successively μ _ 1,
μ _ 2 ..., μ _ M-1, μ _ M, the variance of each position can and be labeled as δ _ 1, δ _ 2 ..., δ _ M-1, δ _ M.
For the pixel capacitance of any one position of identical on N piece touch screens, relative to basis in prior art
The fluctuation range of mean value definition pixel capacitance, average and variance more can accurately draw the ripple of each pixel capacitance
Dynamic size, corresponding, the result of the pixel capacitance detection range for subsequently being calculated according to average and variance is more steady
It is fixed and reliable.
Step 122, according to the capacitance average and variance of i-th position pixel, calculate i-th according to equation below
The pixel capacitance term of reference of individual position：
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is institute
The upper limit of the pixel capacitance term of reference of i-th position is stated, μ _ i is the capacitance average of i-th position pixel,
δ _ i is the capacitance variance of i-th position pixel, and cpk is process capability parameter.
Known cpk reflects the height of process yield, and here is according to the cpk values of touch screen, capacitance mean μ _ i and side
Difference δ _ i calculates higher limit and the lower limit of pixel capacitance, by taking the pixel capacitance upper lower limit value of the 1st position as an example,
LimitD_1=μ _ 1-cpk*3* δ _ 1, LimitU_1=μ _ 1+cpk*3* δ _ 1, then the numerical value of LimitD_1～LimitU_1
Pixel capacitance bound scope of the scope for the 1st position of N piece touch screens identical, as the N pieces being originally taken are touched
Unqualified touch screen is there may be in screen, so the capacitance bound scope for calculating can not be used as accurate capacitance
Detection range application, can the inspection of 100% certified products touch screen of infinite approach that goes out of Practical Calculation subsequently through loop iteration algorithm
Survey scope.Product, therefore the pixel capacitance bound scope for currently calculating is only capacitance term of reference.The like,
Calculate the pixel capacitance term of reference of other M-1 position.
Preferably, process capability parameter cpk is specially：2≥cpk≥1.67.
This step 120 only passes through the mean μ _ i and variance δ _ i of the pixel capacitance of i-th position for calculating, and
Process capability parameter cpk, you can calculate the pixel capacitance term of reference of i-th position of N piece touch screens, each position
The pixel capacitance term of reference computational methods put are simple, determined according to the capacitance of its correspondence position pixel, combined
The different phenomenon of the actual capacitance fluctuation range of each pixel of touch screen, therefore model is referred to according to pixel capacitance subsequently
Enclose to produce when detecting each pixel and sentence or fail to judge, the mistake for also solving prior art accordingly is sentenced, fails to judge and ask
Topic.
Whether step 130, the capacitance of the N*M pixel judged on touch screen described in N pieces are in its correspondence position
Pixel capacitance term of reference in.
Known steps 120 have drawn the term of reference of i-th position pixel capacitance of identical on N piece touch screens
LimitD_i～LimitU_i, wherein, i=1,2 ..., M-1, M, then according to the reference model of i-th position pixel capacitance
Enclose, judge the capacitance of i-th position pixel of identical on N piece touch screens whether in the pixel electric capacity of i-th position
In value term of reference LimitD_i～LimitU_i, if so, then judge that whether other M-1 position pixel capacitance exist successively
In the pixel capacitance term of reference of its correspondence position, thus judgement inspection can be carried out to N*M whole pixel capacitances
Survey.
Here, preferred judge process is also based on order or random fashion is corresponding to each position at most N number of
Pixel is judged that its detailed process is：If judged based on sequential system, according to the 1st position pixel capacitance ginseng
Scope is examined, judges that whether the 1st position pixel capacitance of identical be in the 1st position pixel electric capacity on N piece touch screens
Value term of reference LimitD_1～LimitU_1；If so, then order judges the 2nd position pixel capacitance；If not, it is assumed that N
There is the 1st position pixel capacitance of 3 touch screens in piece touch screen not in LimitD_1～LimitU_1, then sequentially sentence
During disconnected 2nd position pixel capacitance, the pixel of the 2nd position of 3 touch screens is rejected, only to N-3 piece touch screens
The capacitance of the 2nd position pixel judged, if there is the 2nd position pixel of 5 touch screens in N-3 piece touch screens
Capacitance not in LimitD_2～LimitU_2, when then order judges the 3rd position pixel capacitance, is rejected this 5 and is touched
Screen is touched, only the capacitance of the 3rd position pixel of N-3-5 piece touch screens is judged, the like, to each position
Judgement object, when pixel capacitance is judged, judge that the number of object sequentially may be reduced.If being sentenced based on random fashion
When disconnected, then similar with sequential system process, which differs only in, and by taking the 1st position as an example, has judged the 1st position pixel
After capacitance, at random m-th position pixel capacitance may be judged, each of which position judge object
Number is likely to order and reduces.The touch screen that unqualified pixel is located no longer is judged during being somebody's turn to do, alleviate judgement work
Measure.
In this step 130, by the pixel capacitance term of reference according to i-th position, judge on N piece touch screens
N number of pixel capacitance of i-th position whether in LimitD_i～LimitU_i, so as to on N piece touch screens each
Pixel judged, and the limit of full wafer touch screen each pixel is incomplete same, relative to solve prior art
The mistake caused for each pixel setting identical limit is sentenced, problem of failing to judge.
Step 140, when the capacitance of any 1 pixel judged on any 1 touch screen it is right at which
Answer in the pixel capacitance term of reference of position, the pixel capacitance term of reference for arranging i-th position is made
For the pixel capacitance detection range of correspondence position.
As described above, when the capacitance of each pixel judged on current all of touch screen is in its correspondence position
Pixel capacitance term of reference in, then the current all of touch screen of respective description is certified products, it is also possible to think meter
Each the position pixel capacitance term of reference for drawing is the pixel capacitance of 100% qualified touch screen of infinite approach
Scope, therefore the pixel capacitance term of reference of each position of all of touch screen can be set to correspondence position
Pixel capacitance detection range.According to each position pixel capacitance detection range on the touch screen for obtaining, can be right
Other arbitrarily a piece of touch screens are detected, to detect whether touch screen is qualified.
In this step 140, the capacitance of the pixel of any a piece of touch screen in current all of touch screen is all located at
In the capacitance term of reference of its correspondence position, each the position pixel capacitance term of reference for calculating is infinitely to connect
The pixel capacitance value range of nearly 100% qualified touch screen, then do not result in fail to judge or cross and sentence, it is also possible to solve prior art
What middle capacitance detection limit was present fails to judge, crosses and sentence problem.
Preferably, the picture described at least one in step 130 judges the N*M pixel on touch screen described in N pieces
The capacitance of vegetarian refreshments not in the pixel capacitance term of reference of its correspondence position when, the method is further comprising the steps of：
Step 131, when one or more the described pixels on any 1 touch screen judged described in L pieces in touch screen
Pixel capacitance term of reference of the capacitance of point beyond its correspondence position, from the pixel of touch screen described in the N pieces for obtaining
Capacitance in remove the touch screen described in L pieces pixel capacitance, wherein, L is integer and N >=L>0.
As described above, if it is determined that the capacitance of one or more pixels on any 1 touch screen in L piece touch screens
Beyond the pixel capacitance term of reference of its correspondence position, illustrate the L pieces touch screen be defective work, then here need from
The pixel capacitance of the L piece touch screens is rejected in the capacitance value data of each pixel of the N piece touch screens being originally taken
Data, then the capacitance value data of current residual is the capacitance value data of each pixel of N-L piece touch screens.Further, since N
The unqualified capacitance value data of L piece touch screens is contained in the capacitance value data of piece touch screen, then according to the electricity of N piece touch screens
The pixel capacitance term of reference that capacitance data are calculated also can not be used as the pixel capacitance detection range of touch screen.
Step 132, return to step 110, work as N>L>The capacitance that the step 110 is currently obtained when 0 is described in residue N-L pieces
The capacitance of each of touch screen pixel, as N=L, the step 110 reacquires each picture of X piece touch screens
Touch screen described in the capacitance of vegetarian refreshments and the X pieces that currently obtain is to touch described in other X pieces outside touch screen described in N pieces
Screen, and successively execution step 110 to step 140.
As mentioned above, it is known that including underproof L pieces touch screen in N piece touch screens, then reject the pixel of L piece touch screens
After point capacitance value data, according to the capacitance value data of each pixel of the N-L piece touch screens of current residual, recalculate
The pixel capacitance term of reference of remaining N-L pieces touch screen, so that the inspection of calculated each pixel capacitance
Survey the capacitance value range that scope infinitely approaches 100% qualified touch screen.The detection range of the touch screen pixel capacitance is obtained
The method of taking is to be obtained based on loop iteration algorithm.
Here, the capacitance that the step of obtaining the pixel capacitance term of reference of N-L piece touch screens is obtained for step 110
Data are remaining capacitance after rejecting L piece touch screen capacitance value datas, calculate remaining N-L pieces touch screen in step 120
The pixel capacitance average and variance of upper i-th position of identical, thus obtains the pixel capacitance ginseng of N-L piece touch screens
Judge (N-L) * M pixels capacitance on N-L piece touch screens whether in the picture of its correspondence position in examining scope, step 130
In vegetarian refreshments capacitance term of reference, if in N-L pieces touch screen, the pixel capacitance of any a piece of touch screen exists in step 140
In its corresponding pixel capacitance term of reference, then the N-L pieces touch screen is certified products, in the pixel electric capacity for calculating
Term of reference is set as the detection range of touch screen pixel capacitance, and other any touch screens can be detected.Certainly
If having unqualified touch screen in N-L piece touch screens, the continuation being similar to proposes the capacitance value data of unqualified touch screen, successively root
According to loop iteration algorithm repeat step 110-140, until judging any 1 pixel on any 1 touch screen
Capacitance in the pixel capacitance term of reference of its correspondence position, thus arrange pixel capacitance refer to model
Enclose the pixel capacitance detection range for correspondence position.
Additionally, work as in step 131, judge in N piece touch screens per at least one pixel capacitance in a piece of touch screen not
In its correspondence position pixel capacitance term of reference, then illustrate that the N pieces touch screen is defective work, need to touch in N pieces
Outside screen, then the pixel capacitance of random collecting X pieces touch screen again, until getting pixel capacitance in step 140
Till detection range.
This step 131-132, as circulation step, by rejecting defective work, is circulated repeatedly to remaining touch screen
For algorithm, so that the 100% certified products scope of pixel capacitance detection range infinite approach for calculating.
A kind of acquisition methods of the pixel capacitance detection range of touch screen that the embodiment of the present invention one is provided, according to picture
The average and variance of vegetarian refreshments calculates pixel capacitance term of reference, and by the pixel of pixel capacitance and correspondence position
Capacitance term of reference is compared, and whether knows the pixel as certified products with this, by the algorithm of loop iteration, only when
The capacitance of each pixel of acquired touch screen, just will be right in its correspondence position pixel capacitance term of reference
Position pixel capacitance term of reference is answered to be set to correspondence position pixel capacitance detection range.Calculated by the method
The pixel capacitance detection range for going out be not it is simple set identical fluctuation range to whole piece touch screen, but for every
Individual pixel individually sets a detection range, makes the pixel capacitance detection range of setting more accurate, reasonable, will not band
Come erroneous judgement problem of failing to judge, in addition without the need for determining whether certain touch screen is certified products by checking graphics, solve different people it
Between judge the problem of subjectivity, and need not move through complex experiment when other changes in process parameters of touch screen and determine pixel
Capacitance Limit, it is only necessary to collect the capacitance value data of current touch screen, is calculated using the method and can be drawn accurately reasonably
Pixel capacitance detection range.
Embodiment two
The invention provides a kind of detection method of touch screen, the method includes：
Step 210, the acquisition methods of the touch screen pixel capacitance detection range provided using embodiment one obtain institute
State the pixel capacitance detection range of touch screen.
Set touch screen to be detected and there is K pixel, then the method according to embodiment one, get to be detected
K pixel capacitance detection range on touch screen, then j-th position pixel capacitance detection model of touch screen to be detected
Enclose and be labeled as LimitD_j～LimitU_j, wherein, j=1,2 ..., K-1, K.
The capacitance of step 220, each pixel of the acquisition touch screen, wherein, the touch screen has K picture
Vegetarian refreshments, K are the integer more than 0.
Here, obtaining the capacitance of each pixel of touch screen to be detected, the touch screen has K pixel, that
Here obtains K pixel capacitance value data on touch screen to be detected.
Step 230, judge the touch screen j-th pixel capacitance whether in its correspondence position pixel electric capacity
In value detection range, wherein, j=1,2 ..., K-1, K.
Assume j-th pixel positioned at j-th position of touch screen, then according to j-th position pixel capacitance inspection
Range L imitD_j～LimitU_j is surveyed, judges j-th pixel capacitance of current touch screen to be detected whether in LimitD_
Within j～LimitU_j, wherein, j=1,2 ..., K-1, K.
If j-th pixel capacitance of current touch screen to be detected is within LimitD_j～LimitU_j, order
Or it is random next pixel capacitance on touch screen to be detected is detected, here, can successively to touch to be detected
K pixel capacitance on screen is all detected.
Preferably, certain the 1 pixel capacitance for being judged on touch screen to be detected first can also be worked as not in its correspondence
When in the pixel capacitance detection range of position, stop the detection to the touch screen to be detected, judge the current touch to be detected
Shield for defective work, and detection is proceeded by next touch screen to be detected successively, it is any that the process accordingly reduces detection
The time of a piece of touch screen and workload.
Step 240, when the touch screen each pixel capacitance in its correspondence position pixel capacitance
In detection range, judge that the touch screen is qualified touch screen, or
When the capacitance of at least one pixel of the touch screen does not detect model in its correspondence position pixel capacitance
In enclosing, judge that the touch screen is unqualified touch screen.
According to the judged result of step 230, it is also non-qualified touch screen to judge touch screen to be detected as qualified touch screen, and
Touch screen to be detected judge it is whether qualified complete after, according to step 210 obtain pixel capacitance detection range successively
Next identical touch screen to be detected is detected.
A kind of detection method of touch screen that the present invention is provided, detection process are simple, according to each pixel for obtaining
The different detection range of capacitance, carries out the judgement of its detection range for each pixel capacitance, makes judgement qualified
The pixel capacitance of each touch screen in the pixel capacitance value range of 100% certified products, will not produce sentence or
Fail to judge, also solve in current techniques and problem of sentencing or fail to judge is crossed present in capacitance detection.
Embodiment three
With reference to Fig. 4, it is a kind of acquisition of the pixel capacitance detection range of touch screen that the embodiment of the present invention three is provided
The schematic diagram of device, the technical scheme of the present embodiment pass through to arrange the capacitance scope of each pixel of touch screen, with to identical
The arbitrarily situation detected by a piece of touch screen.The device can be so that, by the way of software and/or hardware, configuration be in a computer
Using.
The device includes：Capacitance acquisition module 310, computing module 320, judge module 330 and setup module 340.
Wherein, capacitance acquisition module 310 is used for obtaining the capacitance of each pixel of touch screen described in N pieces, its
In, there is the M pixel per a piece of touch screen, M is the integer more than 0, and N is positive integer；Computing module 320 is used for
The capacitance average and variance of the pixel of i-th position of identical on touch screen described in N pieces is calculated, to obtain i-th
The pixel capacitance term of reference of position, wherein, i=1,2 ..., M-1, M；Judge module 330 is used for judging to touch described in N pieces
The capacitance of N*M pixels on screen is touched whether in the pixel capacitance term of reference of its correspondence position；Arrange
Module 340 is used for when the capacitance of any 1 pixel judged on any 1 touch screen is in its correspondence position
The pixel capacitance term of reference in, the pixel capacitance term of reference of i-th position is set used as correspondence
The pixel capacitance detection range of position.
Further, the computing module 320 includes：First computing unit 321 and the second computing unit 322.
Wherein, the pixel of first computing unit 321 for i-th position of identical on the touch screen according to N pieces
The capacitance of point, calculates the capacitance average and variance of i-th position pixel；Second computing unit 322 is for according to described
The capacitance average of i-th position pixel and variance, calculate the pixel capacitance reference of i-th position according to equation below
Scope：
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is institute
The upper limit of the pixel capacitance term of reference of i-th position is stated, μ _ i is the capacitance average of i-th position pixel,
δ _ i is the capacitance variance of i-th position pixel, and cpk is process capability parameter.
Further, process capability parameter cpk is specially：2≥cpk≥1.67.
Further, in the judge module 330 judges the N*M pixel on touch screen described in N pieces at least
The capacitance of one pixel not in the pixel capacitance term of reference of its correspondence position when, the device also includes：
Remove module and return module.
Wherein, removing module is used for as 1 or many on any 1 touch screen in touch screen described in judgement L pieces
Pixel capacitance term of reference of the capacitance of the individual pixel beyond its correspondence position, touches from described in the N pieces for obtaining
The capacitance of the pixel of the touch screen described in L pieces is removed in the capacitance of the pixel of screen, and wherein, L is integer and N >=L>0；
Returning module is used for returning the capacitance acquisition module, works as N>L>The electric capacity that the capacitance acquisition module is currently obtained when 0
It is worth the capacitance of each pixel of touch screen described in remaining N-L pieces, the capacitance acquisition module as N=L
Touch screen described in the X pieces for reacquiring the capacitance of each pixel of X piece touch screens and currently obtaining is to touch described in N pieces
Other touch screens described in X pieces outside shielding are touched, and performs computing module, judge module and setup module successively.
Further, the capacitance acquisition module 310 specially at least obtains each picture of 30 touch screens
The capacitance of vegetarian refreshments.
A kind of acquisition device of the pixel capacitance detection range of touch screen that the embodiment of the present invention three is provided, by meter
The pixel capacitance detection range for drawing is not to set identical fluctuation range to whole piece touch screen, but is directed to each
Pixel individually sets a detection range, makes the pixel capacitance detection range of setting more accurate, reasonable, will not bring
Fail to judge erroneous judgement problem, in addition without the need for determine whether certain touch screen is certified products by checking graphics, solve between different people
Judge the problem of subjectivity, and need not move through complex experiment when other changes in process parameters of touch screen to determine pixel electricity
Capacitance Limit, it is only necessary to collect the capacitance value data of current touch screen, can draw accurately rational pixel using the device
Capacitance detection range.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (9)
1. acquisition methods of the pixel capacitance detection range of a kind of touch screen, it is characterised in that include：
Step one, the capacitance for obtaining each pixel of touch screen described in N pieces, wherein, have M per a piece of touch screen
The individual pixel, M are the integer more than 0, and N is positive integer；
Step 2, the capacitance average and variance that calculate the pixel of i-th position of identical on touch screen described in N pieces,
The pixel capacitance term of reference of i-th position is calculated according to equation below,
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is described the
The upper limit of the pixel capacitance term of reference of i position, μ _ i is the capacitance average of i-th position pixel, δ _ i
For the capacitance variance of i-th position pixel, cpk is process capability parameter, i=1,2 ..., M-1, M；
Step 3, judge the capacitance of N*M on touch screen described in the N pieces pixel whether in the pixel of its correspondence position
In point capacitance term of reference；
Step 4, when the capacitance of any 1 pixel judged on any 1 touch screen is in its correspondence position
The pixel capacitance term of reference in, the pixel capacitance term of reference of i-th position is set used as correspondence
The pixel capacitance detection range of position.
2. acquisition methods according to claim 1, it is characterised in that process capability parameter cpk is specially：2≥cpk
≥1.67。
3. acquisition methods according to claim 1, it is characterised in that when step 3 judges the N*M on touch screen described in N pieces
In the individual pixel, the capacitance of pixel described at least one is not in the pixel capacitance term of reference of its correspondence position
When interior, the method also includes：
When the capacitance of one or more pixels on any 1 touch screen in touch screen described in judgement L pieces surpasses
Go out the pixel capacitance term of reference of its correspondence position, from the capacitance of the pixel of touch screen described in the N pieces for obtaining
Except the capacitance of the pixel of the touch screen described in L pieces, wherein, L is integer and N >=L>0；
Return to step one, works as N>L>The capacitance that the step one is currently obtained when 0 is each of touch screen described in remaining N-L pieces
The capacitance of the pixel, as N=L, the step one reacquires the capacitance of each pixel of X piece touch screens simultaneously
And touch screen described in the current X pieces for obtaining is other touch screens described in X pieces outside touch screen described in N pieces, and step is performed successively
Rapid one to step 4.
4. acquisition methods according to claim 1, it is characterised in that each picture of touch screen described in the acquisition N pieces
The capacitance of vegetarian refreshments specially at least obtains the capacitance of each pixel of 30 touch screens.
5. a kind of detection method of touch screen, it is characterised in that include：
The pixel capacitance detection range of the touch screen is obtained using the acquisition methods described in any one of claim 1-4；
Obtain the capacitance of each pixel of the touch screen, wherein, the touch screen has a K pixel, K be more than
0 integer；
Judge the capacitance of j-th pixel of the touch screen whether in its correspondence position pixel capacitance detection range
It is interior, wherein, j=1,2 ..., K-1, K；
When the touch screen each pixel capacitance in its correspondence position pixel capacitance detection range, sentence
The fixed touch screen is qualified touch screen, or
When the touch screen at least one pixel capacitance not in its correspondence position pixel capacitance detection range,
Judge that the touch screen is unqualified touch screen.
6. the acquisition device of the pixel capacitance detection range of a kind of touch screen, it is characterised in that include：
Capacitance acquisition module, for obtaining the capacitance of each pixel of touch screen described in N pieces, wherein, per a piece of institute
State touch screen and there is the M pixel, M is the integer more than 0, and N is positive integer；
Computing module, for calculate on touch screen described in N pieces the capacitance average of the pixel of i-th position of identical and
Variance, calculates the pixel capacitance term of reference of i-th position according to equation below,
LimitD_i=μ _ i-cpk*3* δ _ i
LimitU_i=μ _ i+cpk*3* δ _ i
Wherein, limitD_i is the lower limit of the pixel capacitance term of reference of i-th position, and limitU_i is described the
The upper limit of the pixel capacitance term of reference of i position, μ _ i is the capacitance average of i-th position pixel, δ _ i
For the capacitance variance of i-th position pixel, cpk is process capability parameter, i=1,2 ..., M-1, M；
Whether judge module, for judging the capacitance of the N*M on touch screen described in the N pieces pixel in its correspondence position
Pixel capacitance term of reference in；
Setup module, the capacitance for working as any 1 pixel on any 1 touch screen of judgement are right at which
Answer in the pixel capacitance term of reference of position, the pixel capacitance term of reference for arranging i-th position is made
For the pixel capacitance detection range of correspondence position.
7. acquisition device according to claim 6, it is characterised in that process capability parameter cpk is specially：2≥cpk
≥1.67。
8. acquisition device according to claim 6, it is characterised in that when the judge module judges touch screen described in N pieces
On N*M pixels in the capacitance of pixel described at least one do not join in the pixel capacitance of its correspondence position
When in the range of examining, the device also includes：
Module is removed, for when one or more the described pictures on any 1 touch screen judged in touch screen described in L pieces
Pixel capacitance term of reference of the capacitance of vegetarian refreshments beyond its correspondence position, from the pixel of touch screen described in the N pieces for obtaining
The capacitance of the pixel of the touch screen described in L pieces is removed in the capacitance of point, and wherein, L is integer and N >=L>0；
Module is returned, for returning the capacitance acquisition module, works as N>L>When 0, the capacitance acquisition module is currently obtained
Capacitance is the capacitance of each pixel of touch screen described in remaining N-L pieces, and as N=L, the capacitance is obtained
Touch screen described in the X pieces that module reacquires the capacitance of each pixel of X piece touch screens and currently obtains is N pieces institute
Other touch screens described in X pieces outside touch screen are stated, and performs computing module, judge module and setup module successively.
9. acquisition device according to claim 6, it is characterised in that the capacitance acquisition module is specially at least obtained
The capacitance of each pixel of 30 touch screens.
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