CN102135827B - Negative pixel compensation method and device, touch sensor device and terminal device - Google Patents

Negative pixel compensation method and device, touch sensor device and terminal device Download PDF

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CN102135827B
CN102135827B CN201010529723.2A CN201010529723A CN102135827B CN 102135827 B CN102135827 B CN 102135827B CN 201010529723 A CN201010529723 A CN 201010529723A CN 102135827 B CN102135827 B CN 102135827B
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touch
image
value
factor
compensating
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CN102135827A (en
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W·M·维塔
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Apple Inc
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Apple Computer Inc
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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
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
    • 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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The invention relates to a negative pixel compensation method and a device, a touh sensor device and a terminal device, in particular to the negative pixel compensation in a touch sensor panel. A method can compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the panel. To do so, the method can include determining at least one bound for a negative pixel compensation factor based on touch signal values, estimating the compensation factor within the determined bound based on the touch signal values that are negative, where the negative values indicate the presence of the negative pixel effect, and applying the estimated compensation factor to the touch signal outputs to compensate the touch signal values for the negative pixel effect.

Description

Compensate the method and apparatus of negative pixel effect, touch-sensitive device and terminal device
Technical field
The disclosure is usually directed to touch-sensitive device, particularly relates to the negative pixel effect compensated in touch-sensitive device.
Background technology
Very eurypalynous input equipment can be used for executable operations in computing systems at present, and described input equipment is such as button or button, mouse, trace ball, operating rod, touch sensor panel and touch-screen etc.Touch-sensitive device, especially touch-screen, just becoming and becoming more and more popular, and this is due to the convenience of its operation and versatility and its price constantly declined.Touch-sensitive device can comprise touch sensor panel, it can be the transparent panel with touch sensitive surface, and the display device of such as liquid crystal display (LCD) and so on, this display device can be partly or wholly placed in this panel after to make touch sensitive surface can cover the visibility region of this display device at least partially.Touch-sensitive device can make user can perform various function by using finger, stylus or the position of other objects indicated by the usual user interface (UI) shown by display device to touch this touch sensor panel.Usually, touch-sensitive device can identify touch event and the position of this touch event on touch sensor panel, and computing system can explain touch event according to the display occurred when touch event occurs subsequently, can perform one or more action thereafter based on this touch event.
When touching the object imperfect earth of touch sensor panel, represent that the touch output valve of touch event may be mistake or distortion.When there are two or more on touch sensor panel while during touch event, the probability of this mistake or distortion value may increase further.
Summary of the invention
The disclosure relates to the mistake for being caused by the user of touch panel or the imperfect earth of other objects, and compensation meter is shown in the touch signal of the touch at touch sensor panel place.Mistake like this can be a negative pixel effect, wherein can be sensed the positive quantity of the obvious negative quantity of touch and/or the reduction of touch during multiple touch simultaneously by this panel.A kind of method for compensating this effect can comprise: based at least one boundary of touch signal values determination compensating factor; Be based upon the touch signal values of negative value, estimate the compensating factor in determined boundary, wherein negative touch signal can represent this effect; And the compensating factor estimated is applied to described touch signal to compensate described touch signal.
Accompanying drawing explanation
Fig. 1 illustrates and operates according to the exemplary touch of the touch sensor panel of various embodiment.
Fig. 2 illustrates the exemplary negative pixel effect in the multiple touch sensor panels simultaneously touched of finger receiving imperfect earth according to various embodiment.
Fig. 3 illustrates the illustrative methods for compensating the negative pixel effect in touch sensor panel according to various embodiment.
Fig. 4 illustrates and calculates according to the exemplary bias noise (bias noise) in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Fig. 5 illustrates and determines according to the EXEMPLARY COMPENSATION factor boundary in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Fig. 6 illustrates and determines according to the another kind of EXEMPLARY COMPENSATION factor boundary in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Fig. 7 illustrates and estimates according to the EXEMPLARY COMPENSATION factor in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Fig. 8 illustrates according to the EXEMPLARY COMPENSATION factor application in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Fig. 9 illustrates and selects according to the EXEMPLARY COMPENSATION in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Figure 10 illustrates and selects according to the another kind of EXEMPLARY COMPENSATION in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.
Figure 11 illustrates the exemplary computer system that can compensate negative pixel effect according to various embodiment.
Figure 12 illustrates the illustrative mobile phone that can compensate negative pixel effect according to various embodiment.
Figure 13 illustrates the exemplary digital media player that can compensate negative pixel effect according to various embodiment.
Figure 14 illustrates the Exemplary personal computer that can compensate negative pixel effect according to various embodiment.
Embodiment
In the following description to various embodiment, with reference to accompanying drawing, this accompanying drawing defines a part for description, and is shown the specific embodiment that can put into practice in the accompanying drawings by illustrated mode.Should be understood that, other embodiments can be used, and structure change can be done, and do not deviate from the scope of various embodiment.
The disclosure relates to the imperfect earth due to the user or other objects that touch this panel compensated in touch sensor panel and the negative pixel effect caused.Compensation method can comprise: based on touch signal values, determines at least one boundary of the negative pixel compensation factor; Be based upon the touch signal values of negative value, estimate the compensating factor in determined boundary, wherein negative signal value represents this negative pixel effect; And the compensating factor estimated is applied to described touch signal with for touch signal values described in negative pixel effect compensating.
The ability measuring the negative pixel effect in touch sensor panel can advantageously provide more accurately and touch detection faster, and power is saved, and this is owing to suffering duplicate measurements under imperfect earth status conditions.In addition, this panel more robustly can be adapted to the various ground connection situations of user or other objects.
Term " imperfect earth ", " unearthed ", " not having ground connection ", " not having ground connection well ", " improper ground connection ", " isolation " and " suspension joint (floating) " can be exchanged and be used to indicate imperfect earth situation, and this situation can when object have Low ESR to be conductively coupled to the ground of touch sensor panel.
Term " ground connection ", " appropriate ground connection " and " good earth " can exchange and use to indicate good earth situation, and this situation can exist when object Low ESR is conductively coupled to the ground of touch sensor panel.
To describe in this article and illustrated touch sensor panel can comprise configuration, on wherein conduction driving and sense wire (will be described below) can be formed on the relative both sides of substrate, on the same side of substrate, on the same side of substrate same layer or first-class at different substrate.Although to describe in this article and illustrated touch sensor panel has and is formed in driving in orthogonal row and column and sense wire, but be to be understood that other geometric configuration are also possible, the concentric circles of such as polar coordinates configuration and radial line, the oblique configuration diagonal line of (oblique configuration) and anon-normal intersection etc.
Fig. 1 illustrates and operates according to the exemplary touch of the touch sensor panel of various embodiment.In the example in fig 1, touch sensor panel 100 can comprise the array of pixel 106, this pixel 106 can be formed on the point of crossing place of line 102 and alignment 104, although be to be understood that and can use other pixel arrangement, such as driving adjacent one another are and sensing region on the single layer of this panel.Each pixel 106 can have the relevant mutual capacitance Csig 114 be formed between the line 102 of intersection and alignment 104.As shown in Figure 1, line 102 can be used as drive wire, and alignment 104 can be used as sense wire, the pumping signal 110 that wherein drive wire can be provided by driving circuit (not shown) encourages, this pumping signal 110 can comprise interchange (AC) waveform, and sense wire can send that touch or sensing signal 103-it represents touch at this panel 100 place-to sensing circuit (not shown), this sensing circuit can comprise the sensing amplifier for each sense wire.
In order to sense the touch at this panel 100 place, in certain embodiments, multiple drive wire 102 can be energized signal 101 and substantially side by side encourage to couple with sense wire 104 capacitive character of intersecting, thus forms the capacitive paths being used for electric charge being couple to sense wire from drive wire.The sense wire 104 intersected can export the output signal representing electric charge or the electric current coupled.While some drive wires 102 are just energized, other drive wires can be coupled to ground or other DC level.In other embodiments, every bar drive wire 102 can be energized signal 101 and sequentially encourage to couple with sense wire 104 capacitive character of intersecting, the sense wire 104 of this intersection can export the output signal representing electric charge or the electric current coupled, and other drive wires can be coupled to ground or other DC level simultaneously.In some embodiments again, can exist just by many drive wires 102 that substantially side by side encourage with just by the combination of single drive wire sequentially encouraged.
When the user of good earth points (or other objects) touch panel 100, finger can make to reduce a quantity Δ Csig at touch location place electric capacity Csig 114.This capacitance variations Δ Csig can touch finger and is divided to ground instead of is coupled to and cause at the sense wire 104 of the intersection of touch location by pass through from the electric charge of energized drive wire 102 or electric current.Represent that the touch signal 103 of capacitance variations Δ Csig can send to sensing circuit to process by sensed line 104.Touch signal 103 can indicate and touch the pixel that part occurs and the amount of touch occurred at this location of pixels.
When the user of imperfect earth points (or other objects) touch panel 100, the finger capacitance Cfd to energized drive wire 102, the finger capacitance Cfs to the sense wire 104 of the intersection at touch location place and the finger capacitance Cgnd to user ground can form auxiliary electrical capacitive path electric charge being couple to sense wire from drive wire.By the drive wire 102 be energized generate and by finger send electric charge in some electric charges coupled via auxiliary electrical capacitive path the sense wire 104 getting back to intersection, instead of ground.Therefore, the electric capacity Csig 114 of the pixel at touch location place is replaced to be lowered Δ Csig, Csig can only be lowered (Δ Csig-Cneg), wherein Cneg can represent so-called " negative capacitance ", and by the imperfect earth due to finger, the electric charge be couple in the sense wire of intersection caused for it.Touch signal 103 usually can also indicate the pixel occurring to touch part, but has the instruction of the actual few amount of touch occurred of contrast.
When the user of multiple imperfect earth points (or other objects) at diverse location while during touch panel 100, first finger capacitance Cfd and Cfs can be formed on the touch location place of the first finger as mentioned above, that is, at the infall of energized drive wire 102 and sense wire 104.Can also be coupled by second finger from some electric charges in the electric charge of the first finger gets back in panel 100, with the touch location place making second finger electric capacity Cfd and Cfs can be formed in second finger, namely at the infall of unexcited drive wire 102 and sense wire 104.Electric capacity Cgnd to user ground can also be formed as mentioned above.Therefore, touch signal 103 can indicate the pixel of the first finger touch part, but has the instruction of the actual few amount of touch occurred of contrast, as previously mentioned.Touch signal 103 can also refer to be shown in by the pixel intersected to form of the sense wire 104 of the drive wire 102 be energized and second finger and/or touches in the puppet of the pixel intersected to form by the unexcited drive wire of second finger and the sense wire of the first finger.Touch signal 103 can indicate the significantly negative amount of touch at these pixel places, and it causes because electric charge is coupled to get back in panel by second finger.This can be so-called " negative pixel effect ".
Similarly, when the drive wire 102 at the touch location place in second finger is energized, second finger electric capacity Cfd and Cfs can be formed as mentioned above at touch location place.Also can get back in panel 100 by the first finger coupling from some electric charges in the electric charge of second finger, with the touch location place making the first finger capacitance Cfd and Cfs can be formed in the first finger, that is, at the infall of its now unexcited drive wire 102 and sense wire 104.Electric capacity Cgnd to user ground also can be formed.Therefore, touch signal 103 can indicate second finger to touch the pixel of part, but has the instruction of the actual few amount of touch occurred of contrast, as previously mentioned.Touch signal 103 also can indicate the pixel that formed in the intersection of the sense wire 104 by the drive wire 102 be energized and the first finger and/or the puppet of pixel that formed in the intersection by the unexcited drive wire of the first finger and the sense wire of second finger touches and by the first finger, the significantly negative amount of touch caused at these pixel places in panel 100 is got back in coupling due to electric charge, thus produces negative pixel effect.
Fig. 2 illustrates the exemplary negative pixel effect in the multiple touch sensor panels simultaneously touched of finger receiving imperfect earth according to various embodiment.As shown in Figure 2, line 202 can be used as drive wire, and alignment 204 can be used as sense wire.In the example in figure 2, first finger of imperfect earth (represents with circle symbol, and identified " finger 1 ") can touch at the pixel 206a place of touch sensor panel 200, and the second finger of imperfect earth (represent with circle symbol, and identified " finger 2 ") can touch at the pixel 206b place of panel.When drive wire (or line) 202a of panel 200 is energized, the electric capacity along the first path between drive wire 202a and sense wire (or alignment) 204a can be (Csig-Δ Csig).Due to these finger imperfect earth, so the second capacitive paths can be formed between drive wire 202a and sense wire 204a, there is electric capacity Cfd (between drive wire 202a and first finger) and Cfs (between sense wire 204a and first finger), and the 3rd capacitive paths can be formed between drive wire 202c and sense wire 204b via second finger, there is electric capacity Cfd (between drive wire 202c and second finger) and Cfs (between sense wire 204b and second finger).Electric capacity Cgnd also can be formed between finger and user ground.Electric capacity can be got back to panel 200 because the electric charge that obtained from energized drive wire 202a by the first finger or electric current are coupled at pixel 206a and 206b instead of cause with being divided to.Similar electric capacity can be formed in the first finger and second finger place when drive wire 202c is energized.Therefore, pixel 206c and 206d, it does not still receive touch close to the pixel 206a be touched and 206b, can indicate negative amount of touch (" negative pixel ").
Thus, detect negative pixel effect and the touch-sensing of touch sensor panel under imperfect earth situation can be improved for this effect compensating touch signal.
Compensate some method iterative processing touch signal of negative pixel effect, until this effect is only compensated for as.But this method is computationally expensive, and consuming time.Expect faster in some cases and calculate so not expensive method.According to various embodiment, this this effect that can be compensated in touch signal by the factor (or parameter) and this factor of use determining expression negative pixel effect is as mentioned above realized.
According to the compensation of the following approximate representation of relation between the touch image Im measured (caught by touch sensor panel and be subjected to the image of negative pixel effect) and original touch image I (it should be and not have the image of negative pixel effect) for negative pixel effect:
I＝I m+R×f(I m) (1)
Wherein, the R=negative pixel compensation factor, it can be the function of Cfd, Cfs, Cgnd and panel designs constant, thus represents ground connection situation; And f (I m)=according to the image I measured mthe correcting image that touch signal represents as follows along drive wire (line) and sense wire (alignment):
f(I m)＝∑I m，row×∑I m，col (2)
Wherein, ∑ I m, row=touch signal the sum that measures along drive wire (line); And ∑ I m, col=touch signal the sum that measures along sense wire (alignment).The touch signal I measured mcan be the measured value that electric capacity changes Δ Csig, as mentioned above.
For each pixel, equation (1) can be represented as follows:
I ( i , j ) = I m ( i , j ) + R × Σ all _ j I m ( i , j ) × Σ all _ i I m ( i , j ) - - - ( 3 )
Wherein, (i, j)=by the position of the pixel intersected to form of drive wire (line) i in touch sensor panel and sense wire (alignment) j; and
Equation (1) shows original image I can by using compensation term R × f (I m) the image I that arrives of compensating measure m, thus reduce or eliminate negative pixel effect, recover.Therefore, by estimating appropriate negative pixel compensation factor R and this factor being applied to the touch signal measured, according to the negative pixel effect that various embodiment can compensate in the image measured.Although equation (1) represents linear compensation, be to be understood that nonlinear compensation is also possible.
Fig. 3 illustrates the illustrative methods for compensating the negative pixel effect in touch sensor panel according to various embodiment.In the example in figure 3, the touch signal from the pixel of touch sensor panel measuredly can touch image I to provide m(305).In certain embodiments, when not touching, the electric capacity Csig1 at each pixel place can compare with the electric capacity Csig2 determined at this pixel place when touching, so that electric capacity changes Δ Csig=Csig1-Csig2 can form touch signal measured value.Electric capacity Csig1 can indicate background capacitance, its can determine before the procedure or panel operation period determine.Based on the touch signal I measured mwith the characteristic of touch sensor panel, expect that the boundary at negative pixel compensation factor R place can be determined, to guarantee being rational estimation (310) subsequently by estimative factor R.The negative pixel compensation factor R (315) in the boundary determined can be estimated subsequently.The negative pixel compensation factor R estimated can be applied to the touch image I measured m, such as, by using equation (1), to recover original image I and there is no negative pixel effect (320).This method will be described in more detail below.
Some touch sensor panels, especially larger panel, considerable noise can be incorporated in the touch image measured, it adversely can affect negative pixel compensation.Thus, the touch image measured can be pretreated to reduce noise before execution negative pixel compensation, such as shown in Figure 4.
Fig. 4 illustrates and calculates according to the exemplary bias noise (bias noise) in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example in fig. 4, touch image I is being measured m(305), after, bias noise can be deducted from the image measured.For this reason, whether the touch signal of the pixel can determined from the sense wire (alignment) along touch sensor panel is less than predetermined noise threshold (405).This noise threshold can be pre-determined as follows.When not measuring touch signal when the touch at touch sensor panel place.Do not having in noisy touch image, touch signal values should be approximately 0, and this instruction does not touch.But in noise touch signal, when not touching, touch signal values can be non-zero, the noise bias voltage in this indication panel.The average of touch signal can be calculated, and noise threshold can be set to this average.Due to noise bias voltage normally touch sensor panel design function and be static slightly, so noise threshold can be calculated before the operation of panel, and if needs, can be upgraded once in a while during panel operation.If touch signal is less than this threshold value, this touch signal is regarded as non-tactile, and the noise (410) in indication panel.
Enough non-tactile signals (415) for calculating rational noise bias voltage can be determined whether there is.In certain embodiments, the quantity of non-tactile signal can compared with minimum, and if be greater than this minimum, this is enough to calculating noise bias voltage.Such as, based on panel operation and design etc., empirically minimum can be determined.Can by non-tactile signal calculating noise bias voltage (420).In certain embodiments, noise bias voltage may be calculated the mean value of non-tactile signal.In certain embodiments, noise bias voltage can be calculated as the intermediate value (median) of non-tactile signal.Other technologies also may be used for according to non-tactile signal calculating noise bias voltage.The noise bias voltage calculated can deduct (425) from all touch signals this sense wire (or alignment).
The method can be repeated to deduct this noise bias voltage (430) from all touch signals in this sense wire for each sense wire.
After deduct noise bias voltage from touch signal, deduct the image I measured after noise bias voltage mcan be used to determine negative pixel compensation factor R boundary subsequently, and the method for Fig. 3 can be carried out (310) as described above.
Fig. 5 illustrates and determines according to the EXEMPLARY COMPENSATION factor boundary in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example of fig. 5, touch image I is being measured m(305), after, the boundary (310) of negative pixel compensation factor R can be determined.Depend on touch sensor panel design, the negative pixel compensation according to equation (1) may or may not be applied well.Good degree may depend on panel size, wiring (wiring), pixel layout and pixel adjacency etc.Like this, for can not the panel designs (being denoted as in Fig. 5 " A ") of applicable equations (1) well, the method can fix limit in one way.For can the panel designs (being denoted as in Fig. 5 " B ") of applicable equations (1) well, the method can fix limit in another way.Larger panel usually but always do not design classification at " A "; Otherwise less panel usually but always do not design classification at " B ".
Touch sensor panel design (505) will determining its boundary can be determined.Classification that if panel designs belongs to " A ", then can generate upper limit negative pixel compensation factor R 1 based on maximum touch signal, this maximum touch signal can be sensed by touch sensor panel Smax or reach (510).This can by selecting the touch image I measured min maximum touch signal value and use equation (1) to determine maximum compensating factor R realizes, wherein this maximum compensating factor R is by the touch signal values after the correction that provides in the original touch image I of selected maximum touch signal value Smax.This maximum compensating factor R can be configured to upper limit factor R 1.The touch image I that this hypothesis maximum touch signal value is measuring min position roughly the same with the position of maximum touch signal value in original touch image I, this may be suitable in some cases also may be inapplicable.This also supposes the touch image I measured min the value that reaches of maximum touch signal there is the value Smax in original image, this may be suitable in some cases also may be inapplicable.When applying this hypothesis, negative pixel compensation factor R can equal upper limit factor R 1.But when applying this hypothesis, the value of the maximum touch signal in original touch image I may be less than Smax, so that negative pixel compensation factor R can be less than upper limit factor R 1.
Upper limit factor R 1 can be iterated to carry out meticulous adjustment so that provide improvement or tight upper limit factor R 2 (515).Because make factor R 1 not resemble because equation (1) cannot be applied to this panel designs completely preferred so accurate, so this can be implemented.In order to calculating upper limit factor R 2, the image I measured m, correcting image f (I m) and upper limit factor R 1 can be applied to equation (1) with calculate usage factor R1 generate image Ir1.The position Pr1 of maximum touch signal value in image Ir1 can be selected.Use equation (1), maximum compensating factor R can based on the image I measured min the correcting image f (I of touch signal values, maximum panel touch signal values Smax and correspondence at Pr1 place, position m), maximum compensating factor R can be determined.This maximum compensating factor R can be configured to upper limit factor R 2.Further iteration can be finished to improve or tighten up the upper limit factor further.Preferably, the number of times of iteration can be less to raise the efficiency.The upper limit of the negative pixel compensation factor can be set to factor R 2 (520).
If classification that panel designs belongs to " B ", then can generate upper limit negative pixel compensation factor R 1 (525) based on the maximum touch signal that can be sensed by touch sensor panel.This can by selecting the touch image I measured min maximum touch signal value and use equation (1) to determine maximum compensating factor R realizes, wherein maximum compensating factor R will provide the image I measured min the correction of selected maximum touch signal value in original touch image I after touch signal values.This maximum compensating factor R can be configured to upper limit factor R 1.
Another upper limit negative pixel compensation factor R 2 (530) can be generated based on the pixel value sum in original touch image I.This can by estimating that upper limit factor R 2 realizes as follows:
R = a × ( G + C gnd , scl ) ( ( 1 - a ) × G + C gnd , scl ) 2 - - - ( 4 )
Wherein, the ground electric capacity using constant b convergent-divergent; G=∑ I is the touch image value sum after the correction in original touch image I; And a, b=touch sensor panel design constant, it can by obtaining for the emulation of given panel sensing patterns design and/or experience measurement.Constant a, b can be determined before panel operation.
In order to use equation (4) calculating upper limit negative pixel compensation factor R 2, such as, " worst case " C can be selected gnd, sclvalue, it represents most differential ground situation.Method or the observation based on counter plate operation can estimate by experiment, determine this value.Owing to not yet calculating original image I at this moment, so value G can be estimated as the touch signal image I measured min the absolute value sum of touch signal or the image I that measures min have on the occasion of touch signal sum.Selected C gnd, sclvalue and estimated G value can be applied to equation (4) with the calculation compensation factor.This compensating factor calculated can be set to upper limit factor R 2.The upper limit of the negative pixel compensation factor can be set to the minimum value (535) in two upper limit factor R 1 and R2.
The lower limit of the negative pixel compensation factor can be set to 0 or be substantially close to 0 a certain value (540).The negative pixel compensation factor R in determined upper and lower bound can be estimated subsequently, and the method (315) of Fig. 3 can be carried out as mentioned above.
Fig. 6 illustrates and determines according to the another kind of EXEMPLARY COMPENSATION factor boundary in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example of fig. 6, touch image I is being measured m(305), after, the boundary (310) of negative pixel compensation factor R can be determined.The characteristic of the touch on touch sensor panel, such as, touch intensity, can affect negative pixel compensation.The full touch (full touch) at touch sensor panel place can generate the touch image I measured min the touch value of the maximum touch signal that can should sense close to panel.Like this, maximum touch signal can be the suitable tolerance for determining the full compensating factor touched; Otherwise touch (light touch) in touching of touch sensor panel place and can generate much lower touch value, it is compared with maximum touch signal, the very big negative pixel effect needing greatly to compensate can be indicated mistakenly.Like this, pixel value sum can be the more suitable tolerance for determining to touch the compensating factor touched.
Can determine in the touch at touch sensor panel place it is entirely touch or touch to touch (605).For full touch, the maximum touch signal that can be able to sense based on touch sensor panel, generates upper limit negative pixel compensation factor R 1 (610).This can realize as mentioned above.Touching for touching, based on the pixel value sum calculated in original touch image I, upper limit negative pixel compensation factor R 1 (615) can be generated.This can realize as mentioned above.
The upper limit of the negative pixel compensation factor can be configured to factor R 1 (620).The lower limit of the negative pixel compensation factor can be configured to 0 or substantially close to 0 value (625).The negative pixel compensation factor R in determined upper and lower bound can be estimated subsequently, and the method (315) of Fig. 3 can be carried out as mentioned above.
Fig. 7 illustrates and estimates according to the EXEMPLARY COMPENSATION factor in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.The touch image I measured min negative pixel be adjusted to 0 or substantially close to 0 to compensate negative pixel effect.The touch image I measured min positive pixel can be adjusted, such as, be promoted to larger on the occasion of, to compensate negative pixel effect.The negative pixel compensation factor R successfully can carrying out this adjustment can be estimated.Because negative pixel provides the most of information estimated needed for factor R, usually so the image I measured min negative pixel can be selected for estimation, simultaneously can ignore 0 and positive pixel.
In the example of fig. 7, after the boundary (310) generating negative pixel compensation factor R, can based on the image I measured min selected negative-appearing image usually estimate the negative pixel compensation factor R (315) in these boundaries.For this reason, the image I measured can be determined min the touch signal values of each pixel (i, j) whether be less than and represent that pixel is the threshold value (705) defined of the possibility of negative pixel.Usually, the image value measured of this pixel (i, j) is more negative, then this pixel is that the possibility of negative pixel is larger.If the image value measured is less than threshold value, so pixel (i, j) can be selected for use in the negative pixel estimating negative pixel compensation factor R.Can for the image I measured min pixel determination correcting image f (I m).Can by suing for peace to the touch signal measured along drive wire (line) i as in equation (2), the touch signal measured along sense wire (alignment) j is sued for peace, and two are multiplied with value, determine each correcting image pixel (i, j) (710).Can use equation (3) in determined boundary, estimate the factor R (i, j) of pixel, equal 0 (715) to make original image pixels I (i, j).If the factor R (i, j) estimated breaks bounds, so factor R (i, j) can be set to closer to the upper limit or lower limit in any one.In addition, or alternatively, the factor R (i, j) be associated with abnormal pixel can be abandoned.If the image value measured exceedes this threshold value (710), so pixel (i, j) is unlikely negative pixel, and therefore can be left in the basket.For the touch image I measured min all pixels (720), (725), can repeat this negative pixel select (705)-(715).
At the touch image I for measuring min selected negative pixel calculate negative pixel compensation factor R (i, j) after, can be that each factor R (i, j) calculates weighting factor, to determine the whole image I measured moverall negative pixel compensation factor R (730).Like this, the pixel that experienced by negative pixel effect can make maximum contribution to global factor R.In certain embodiments, weighting factor can calculate based on the difference between selected negative pixel values and value 0.In certain embodiments, weighting factor can be calculated as the probability that selected negative pixel values is adjusted to 0 by the factor R (i, j) estimated.In certain embodiments, weighting factor can calculate based on the pattern of selected negative pixel values.Also be possible for calculating other parameters of weighting factor.The weighting factor calculated can be applied to the negative pixel compensation factor R (i, j) of its correspondence to produce overall negative pixel compensation factor R (735).In certain embodiments, global factor R can be calculated as the weighted mean of factor R (i, j).In certain embodiments, global factor R can be calculated as the intermediate value of factor R (i, j).In certain embodiments, global factor R can be calculated as the pattern of factor R (i, j).In certain embodiments, global factor R can be calculated as the weighted mean of factor R (i, j) and the combination of pattern.Also be possible for calculating the other technologies of global factor R.Global factor R can be applied to the touch image I measured subsequently mto recover the original image I that compensate for negative pixel effect as equation (1), and the method for Fig. 3 can be carried out (320) as mentioned above.
In certain embodiments, in addition or alternatively, can usually determine whether pixel (i, j) may be negative pixel (705) based on correcting image pixel instead of the image slices measured.Such as, each correcting image pixel (i, j) can compare with noise threshold.In certain embodiments, noise threshold can be arranged based on the noise variance of pixel each in correcting image, wherein, such as, the correcting image pixel image pixel sum measured that can be calculated as in the row at this pixel place is multiplied by the image pixel sum measured in the row at this pixel place, as in equation (2), and noise variance can calculate based on the noise variance of each in these row and column pixels.If correcting image pixel (i, j) value is equal to or less than noise threshold, pixel (i, j) is enough left in the basket for estimating the information of the negative pixel compensation factor owing to not providing.
Fig. 8 illustrates according to the EXEMPLARY COMPENSATION factor application in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example of fig. 8, after have estimated negative pixel compensation factor R (315), factor R can be applied to the touch image I measured mto recover the original touch image I (320) that compensate for negative pixel effect.Negative pixel compensation factor R and correcting image f (I m) (determining according to equation (3)) can be multiplied (805) and the product obtained is added to the touch image I measured m, as in equation (1), to recover the original image I (810) originally not having negative pixel effect.Original image I can be used to further process subsequently.
Can negative pixel compensation be applied when touch sensor panel is subjected to negative pixel effect, and can negative pixel compensation be omitted when panel is not subjected to negative pixel effect.But, in some cases, can exist and there is negative pixel effect and there is no the fastish change between negative pixel effect.Such as, Panel User can fluctuate between ground state (wherein not having negative pixel effect) and unearthed state (wherein negative pixel effect).In addition or alternatively, panel and can not be able to detect between negative pixel effect alternately in detection negative pixel effect, and such as, this is position owing to touching at panel place and causes.Like this, negative pixel compensation can open or close, and this causes the touch image arrived at display measurement or the less desirable image flicker shown between the touch image after compensating.Therefore, logic module can be included in negative pixel compensation optionally to apply compensation thus any other situation preventing or reduce image flicker and/or the puppet between consecutive image can be caused to change.
Fig. 9 illustrates and selects according to the EXEMPLARY COMPENSATION in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example of figure 9, after having recovered to compensate for the original touch image I (320) of negative pixel effect, the touch image I measured can have been maintained between successive images mtotal energy to prevent as follows or to reduce image flicker.The maximal value that compensate for the original touch image I of negative pixel effect can be selected (905), and the touch image I measured mmaximal value can be selected (910).Zoom factor β can be applied to selected original image I value to be scaled the selected image I measured by selection mvalue (915).In certain embodiments, β can get about 80% to 90% of the value that its original calculation goes out, to make the maximal value of original touch image I can the reduced touch image I to measuring mmaximal value about 80% to 90%.Selected zoom factor β can be applied to whole original image I subsequently to create the original touch image Ic after convergent-divergent, and wherein maximal value is roughly the same with the maximal value in the image measured.In certain embodiments, zoom factor β can be the synthesis of the multiple zoom factors being selected for suitably convergent-divergent original image I.
In original image Ic at original image I and thus after convergent-divergent, negative pixel is compensated, thus its value will be 0 or close to 0; Otherwise, the image I measured min negative pixel will have negative value.Positive pixel is compensated, thus its value will by positive justification.Like this, by the image value comparing the original image value after convergent-divergent for each pixel He measure, determine compensate for which pixel (920).If the original image value after convergent-divergent is greater than the image value measured, so pixel be compensate for negative pixel effect, and the original image value after convergent-divergent should be used in the image after last compensation (930).Otherwise pixel is not also compensated, or only compensated a little, and the image value after measuring should be used in the image after last compensation (925).
As a result, between successive images only these significantly compensate after the energy of pixel can change, meanwhile, do not compensated or be only maintained the touch image value measured between successive images by the energy of these pixels compensated a little.Therefore, the gross energy of the image after last compensation does not change substantially with compared with the image previously shown, thus reduces or eliminate image flicker.
Figure 10 illustrates and selects according to another EXEMPLARY COMPENSATION in the illustrative methods that can be included in for compensating the negative pixel effect in touch sensor panel of various embodiment.In the example of Figure 10, after having recovered to compensate for the original touch image I (320) of negative pixel effect, the touch image I will measured between successive images mintensity scale to the intensity of original touch image I to prevent as follows or to reduce image flicker.The maximal value that compensate for the original touch image I of negative pixel effect can be selected (1005), and the touch image I measured mmaximal value can be selected (1010).The zoom factor β being greater than 1 can be applied to the selected image I measured by selection mvalue is to be scaled selected original image I value (1015).β can be 1.0 or more.Selected zoom factor β can be applied to the whole image I measured subsequently mwith the touch image I measured after creating convergent-divergent mc, wherein maximal value is roughly the same with the maximal value in original image.
In original image I, negative pixel is compensated, thus its value will be 0 or close to 0; Otherwise, the image I measured mand the image I measured thus after convergent-divergent mcin negative pixel will have negative value.Positive pixel is compensated, thus its value will by positive justification.Like this, by comparing the image value measured after convergent-divergent and original image value for each pixel, determine compensate for which pixel (1020).If the image value measured after convergent-divergent is less than original image value, so pixel be compensate for negative pixel effect, and original image value should be used in the image after last compensation (1030).Otherwise pixel is not also compensated, or only compensated a little, and the image value measured after convergent-divergent should be used in the image after last compensation (1025).
As a result, between successive images only those significantly compensate after the intensity of pixel can change, meanwhile, do not compensated between successive images or only can be had very little change by the intensity of those pixels compensated a little or not change.When not compensated or only be there is little change by the intensity of the pixel compensated a little, can take some measures this change level and smooth to avoid a small amount of image flicker.
Should be appreciated that the method compensating negative pixel effect is not limited to those methods shown in Fig. 3 to 10, but other and/or the additional action can carrying out negative pixel compensation according to various embodiment can be comprised.
Figure 11 illustrates the exemplary computer system 1100 that can compensate the negative pixel effect in touch sensor panel according to the various embodiments described in this article.In the example of Figure 11, computing system 1100 can comprise touch controller 1106.Touch controller 1106 can be single asic (ASIC), it can comprise one or more processor subsystem 1102, it can comprise one or more primary processor, such as ARM968 processor, or has other processors of similar functions and ability.But in other embodiments, functional processor can instead by special logic, and such as state machine realizes.Processor subsystem 1102 can also comprise peripheral hardware (not shown), the storer of such as random access memory (RAM) or other types or memory device and WatchDog Timer etc.Touch controller 1106 can also comprise for Received signal strength, the touch signal 1103 of such as one or more sense channel, from other sensors, other signals etc. of such as sensor 1111, receiving unit 1107.Touch controller 1106 can also comprise demodulation part 1109, such as multilevel vector demodulation engine, panel scan logic module 1110 and for sending pumping signal 1116 to touch sensor panel 1124 to drive the transmitting portion 1114 of panel.Panel scan logic module 1110 can access RAM 1112, automatically reads data from sense channel, and provides the control for sense channel.In addition, panel scan logic module 1110 can control transmitting portion 1114 to generate the pumping signal 1116 of various frequency and phase place, and it can be selectively used for each row of touch sensor panel 1124.
Touch controller 1106 can also comprise charge pump 1115, and it may be used for generating the supply voltage for transmitting portion 1114.Such as, by cascade two Electricity storage devices, capacitors, to form charge pump 1115, pumping signal 1116 can have the amplitude larger than maximum voltage.Therefore, driving voltage (such as, 6 volts) can higher than the manageable voltage level of single capacitor (such as, 3.6 volts).Although Figure 11 shows charge pump 1115 and is separated with transmitting portion 1114, charge pump can be a part for transmitting portion.
Computing system 1100 can also comprise touch sensor panel 1124, and such as, it can be the panel shown in above Fig. 1.
Computing system 1100 can comprise primary processor 1128, for receiving the output from processor subsystem 1102, and the action performed based on this output, this action comprises, but be not limited to, the object of mobile such as vernier or pointer and so on, roll or translation, adjustment controls to arrange, open file or document, viewing menu, select, perform instruction, operation is couple to the peripherals of main equipment, answer calls, call calling, termination telephone is called out, change volume or audio setting, store the information relevant to telephone communication, such as address, the number often dialed, connect calling, missed call, sign in computing machine or computer network, allow the confined area of this computing machine of authorized individuals access or computer network, load and the user profiles be associated preferably is set with the user of computer desktop, allow access web content, start specific program, and/or encryption or decode messages etc.Primary processor 1128 can also perform other functions, and these functions can have nothing to do with panel process, and can be couple to program storage device 1132 and display device 1130, such as providing the LCD display of UI to the user of equipment.In certain embodiments, primary processor 1128 can be the parts be separated with touch controller 1106, as shown in the figure.In other embodiments, primary processor 1128 can be included as a part for touch controller 1106.In other embodiments more again, the function of primary processor 1128 can perform and/or be distributed among the miscellaneous part of touch controller 1106 by processor subsystem 1102.Display device 1130 together with touch sensor panel 1124, to be partly or entirely positioned under touch sensor panel or with touch sensor panel by together with integrated time, can touch-sensitive device be formed, such as touch-screen.
Note, negative pixel compensation, and one or more in above-mentioned functions, such as can by being stored in storer (such as, one of peripheral hardware) in firmware perform, performed by processor subsystem 1102, or to be stored in program storage device 1132 and to be performed by primary processor 1128.Firmware can also store and/or transmit and be connected for the execution of instruction execution system, device or equipment or and instruction executive system, device or equipment in any computer-readable recording medium, described instruction execution system, device or equipment all computer baseds in this way system, the system that processor comprises or instruction can be taken out from instruction execution system, device or equipment and perform the other system of this instruction.In this context, " computer-readable recording medium " can be comprise or store to be connected by any medium of instruction execution system, device or equipment use program or and instruction executive system, device or equipment.Computer-readable recording medium can include but not limited to electronics, magnetic, optical, electrical magnetic, infrared or semiconductor system, device or equipment, portable computer diskette (magnetic), random access memory (RAM) (magnetic), ROM (read-only memory) (ROM) (magnetic), Erasable Programmable Read Only Memory EPROM (EPROM) (magnetic), portable optic disk, such as CD, CD-R, CD-RW, DVD, DVD-R or DVD-RW, or flash memory, such as compact flash, safe digital card, USB storage device and memory stick etc.
Firmware can also use propagation or and instruction executive system, device or equipment in any transmission medium to be connected in order set, device or equipment, described instruction execution system, device or equipment all computer baseds in this way system, the system that processor comprises or instruction can be taken out from instruction execution system, device or equipment and perform the other system of this instruction.In this context, " transmission medium " can be can transmit, propagate or convey program for any medium of the program of executive system, device or equipment use or be connected with executive system, device or equipment.Transmission medium can include but not limited to electric, magnetic, light, electromagnetism or infrared wired or wireless propagation medium.
Be to be understood that touch sensor panel is not limited to as described in Figure 11 touch, but can be close to panel or any other panel according to various embodiment.In addition, described herein touch sensor panel can be many touch sensor panels.
It should also be understood that computing system is not limited to parts and the configuration of Figure 11, but can comprise other and/or additional parts according in the various configurations of various embodiment compensation negative pixel effect.
Figure 12 illustrates the illustrative mobile phone 1200 according to the performed negative pixel compensation of various embodiment, and it can comprise touch sensor panel 1224, display 1236 and other computing system module.
Figure 13 illustrates the exemplary digital media player 1300 of the performed negative pixel compensation according to various embodiment, and it can comprise touch sensor panel 1324, display 1336 and other computing system module.
Figure 14 illustrates the Exemplary personal computer 1400 according to the performed negative pixel compensation of various embodiment, and it can comprise touch sensor panel (tracking plate) 1424, display 1436 and other computing system module.
By compensating negative pixel effect according to various embodiment, the mobile phone of Figure 12-14, media player and personal computer can realize that power is saved, precision improves, speed improves and robustness improves.
According to an embodiment of the present disclosure, provide a kind of method for compensating negative pixel effect, described method comprises: based at least one boundary touching image value determination compensating factor; Be based upon the touch image value of negative value, estimate the compensating factor in determined boundary; And the compensating factor estimated is applied to described touch image value to compensate described touch image value.
According to the first aspect of this embodiment, determine that at least one boundary of compensating factor comprises: touch at least one in image value sum based on maximum accessible touch image value and expectation, determine the upper limit of compensating factor; And determine that the lower limit of described compensating factor is about 0.
According to the first aspect of this embodiment, estimate that the compensating factor in determined boundary comprises: the compensating factor estimating each negative touch image value; Calculate the weighting factor of each compensating factor estimated; And the weighting factor calculated is applied to the corresponding compensating factor estimated to produce the compensating factor in determined boundary.
According to the third aspect of this embodiment, the weighting factor calculating each compensating factor estimated comprises: calculate the difference between corresponding negative touch image value and 0; And described weighting factor is associated with the difference calculated.
According to the third aspect of this embodiment, the weighting factor calculating each compensating factor estimated comprises: calculate the probability that the negative touch image value of correspondence is adjusted to 0 by corresponding compensating factor; And described weighting factor and the probability correlation calculated are joined.
According to the first aspect of this embodiment, the compensating factor estimated is applied to described touch image value and comprises: calculating expression will to the correcting image value of the correction that described touch image value does; And the compensating factor estimated is added with described touch image value with the product of the correcting image value calculated.
According to the first aspect of this embodiment, described method also comprises: from described touch image value, deduct noise bias voltage.
According to the first aspect of this embodiment, described method also comprises: at least one in the touch image value after zoom factor being applied to described touch image value and compensating is to obtain image consistency.
According to the first aspect of this embodiment, described touch image value instruction ground connection situation.
According to another embodiment of the present disclosure, provide a kind of method for compensating negative pixel effect, described method comprises: analyze the negative pixel values of touch image to determine compensating factor; Determined compensating factor is applied to described touch image and substantially all there is no image after the compensation of described negative pixel values to produce; And after optionally compensating described in convergent-divergent image or described touch image to provide image display consistency.
According to the first aspect of this embodiment, after optionally compensating described in convergent-divergent, image or described touch image comprise: after compensating described in convergent-divergent, image is so that the total energy of image is substantially the same with the total energy of described touch image after described compensation.
According to the second aspect of this embodiment, after compensating described in convergent-divergent, image comprises: select to be used for the high pixel value of image after described compensation to be scaled the zoom factor of the high pixel value of described touch image; And described zoom factor is applied to whole pixel values of image after described compensation.
According to the first aspect of this embodiment, after optionally compensating described in convergent-divergent, image or described touch image comprise: touch image described in convergent-divergent so that the bulk strength of described touch image is substantially the same with the bulk strength of image after described compensation.
According to the fourth aspect of this embodiment, touch image described in convergent-divergent and comprise: the zoom factor selecting to be used for be scaled by the high pixel value of described touch image the high pixel value of image after described compensation; And described zoom factor is applied to whole pixel values of described touch image.
According to another embodiment of the present disclosure, provide a kind of touch-sensitive device, comprising: the touch sensor panel comprising multiple touch location, described multiple touch location is for sensing the touch on described touch sensor panel; And the processor to communicate with described touch sensor panel, described processor is configured to the image catching the touch sensed, identify the negative value in the image captured, the boundary of the compensating factor of the image captured described in adjustment is determined based on identified negative value, estimate compensating factor in determined boundary, and use the compensating factor estimated identified negative value to be adjusted to be about 0.
According to the first aspect of this embodiment, identified negative value is adjusted to be about 0 be carry out based on the nonlinear relationship between the described image that captures and described compensating factor.
According to the first aspect of this embodiment, identified negative value is adjusted to be about 0 be carry out based on the linear relationship between the described image that captures and described compensating factor.
According to the first aspect of this embodiment, described equipment is incorporated at least one in mobile phone, digital media player and personal computer.
According to another embodiment of the present disclosure, provide a kind of method of carrying out negative pixel compensation, described method comprises: determine at least one feature be associated with touch sensor panel; And based on the compatibility of negative pixel compensation and determined feature, described negative pixel compensation is selectively used for the image caught by described touch sensor panel.
According to the first aspect of this embodiment, the image that described negative pixel compensation is selectively used for being caught by described touch sensor panel is comprised: select at least one in the negative pixel compensation based on the maximum touch signal sensed by described touch sensor panel and the negative pixel compensation based on the touch signal sum expecting to obtain in the image not having negative pixel; And the pixel selected negative pixel compensation is applied in the image that captures.
According to the first aspect of this embodiment, described feature is panel designs.
According to the first aspect of this embodiment, described feature is touch type.
According to another embodiment of the present disclosure, provide a kind of terminal device, comprising: the touch sensor panel comprising multiple touch location, described multiple touch location is for sensing the touch on described touch sensor panel; The processor communicated with display with described touch sensor panel, described processor is configured to the image catching the touch sensed, identify the negative value in the image captured, the boundary of the compensating factor of the image captured described in adjustment is determined based on identified negative value, estimate compensating factor in determined boundary, and use the compensating factor estimated identified negative value to be adjusted to be about 0; And display, for showing the image after compensation.
According to another embodiment of the present disclosure, provide a kind of equipment for compensating negative pixel effect, described equipment comprises: for the device of at least one boundary based on touch image value determination compensating factor; For being based upon the touch image value of negative value, estimate the device of the compensating factor in determined boundary; And for the compensating factor estimated being applied to described touch image value to compensate the device of described touch image value.
According to the first aspect of this embodiment, described equipment also comprises: for the compensating factor estimated being applied to described negative touch image value with the device being arranged to described negative touch image value to be about 0.
According to the first aspect of this embodiment, described equipment also comprises: for the compensating factor estimated is applied to on the occasion of touch image value with along positive dirction promote the described device just touching image value.
According to the first aspect of this embodiment, the device at least one boundary determining compensating factor comprises: for touching at least one in image value sum based on maximum accessible touch image value and expectation, determine the device of the upper limit of compensating factor; And for determining that the lower limit of described compensating factor is about the device of 0.
According to another embodiment of the present disclosure, provide a kind of equipment for compensating negative pixel effect, described equipment comprises: for analyzing the negative pixel values of touch image to determine the device of compensating factor; For determined compensating factor being applied to described touch image to produce the device substantially all not having image after the compensation of described negative pixel values; And for image or described touch image after optionally compensating described in convergent-divergent to provide the device of image display consistency.
According to another embodiment of the present disclosure, provide a kind of equipment carrying out negative pixel compensation, described equipment comprises: for determining the device of at least one feature be associated with touch sensor panel; And for the compatibility based on negative pixel compensation and determined feature, described negative pixel compensation is selectively used for the device of the image caught by described touch sensor panel.
According to another embodiment of the present disclosure, provide a kind of computer-readable recording medium, have stored thereon one group for compensating the instruction of the negative pixel effect in touch sensor panel, described instruction is when being executed by processor, make described processor: based on the value of the touch image caught by described touch sensor panel, determine the boundary of compensating factor; Be the touch image value of negative value based on what represent described negative pixel effect, estimate the compensating factor in determined boundary; And the compensating factor estimated is applied to described touch image value to compensate described negative pixel effect.
According to the first aspect of this embodiment, the compensating factor estimated is applied to described negative touch image value to be arranged to be about 0 by described negative touch image value by described processor.
According to the first aspect of this embodiment, described processor the compensating factor estimated is applied to on the occasion of touch image value describedly just touch image value to increase along positive dirction.
Although describe each embodiment completely with reference to accompanying drawing, it should be noted that variations and modifications will become apparent for those skilled in the art.These changes and amendment are contained in being understood in the scope of various embodiments defined by the appended claims.

Claims (24)

1., for compensating a method for negative pixel effect, described method comprises:
Based at least one boundary of obtained one or more touch image value determination compensating factors, wherein said one or more touch image value represents the data obtained from touch sensor panel;
Based on the touch image value in described one or more touch image value being negative value, estimate the compensating factor in determined boundary, wherein negatively touch image value instruction and to touch or close to the user of touch sensor panel or the ground connection situation of object, and the compensating factor wherein estimated to touch or close to the function of the user of touch sensor panel or the ground connection situation of object and estimated touch; And
The compensating factor estimated is applied to described one or more touch image value.
2. method according to claim 1, wherein determine that at least one boundary of compensating factor comprises:
Touching at least one in image value sum and maximum accessible touch image value based on expecting, determining the upper limit of compensating factor; And
Determine that the lower limit of described compensating factor is 0 or is substantially close to 0.
3. method according to claim 1, wherein estimate that the compensating factor in determined boundary comprises:
Estimate the compensating factor of each negative touch image value;
Calculate the weighting factor of each compensating factor estimated; And
The weighting factor calculated is applied to the corresponding compensating factor estimated to produce the compensating factor in determined boundary.
4. method according to claim 3, the weighting factor wherein calculating each compensating factor estimated comprises:
Calculate the difference between corresponding negative touch image value and 0; And
Described weighting factor is associated with the difference calculated.
5. method according to claim 1, is wherein applied to described touch image value and comprises by the compensating factor estimated:
Calculating expression will to the correcting image value of the correction that described touch image value does; And
The compensating factor estimated is added with described touch image value with the product of the correcting image value calculated.
6. method according to claim 1, also comprises:
Noise bias is deducted from described touch image value.
7. method according to claim 1, also comprises:
Zoom factor is applied to described touch image value or compensate after touch image value at least one to obtain image consistency.
8. method according to claim 1, wherein said touch image value instruction ground connection situation.
9., for touching a method for image for negative pixel effect compensating, described method comprises:
Touch image is obtained from touch sensor panel;
Based at least one boundary of obtained touch image value determination compensating factor;
Analyze the negative pixel values of touch image to determine the compensating factor in determined boundary, the ground connection situation of described negative pixel values instruction touch or the object close to described touch sensor panel;
Determined compensating factor is applied to described touch image and does not substantially all have image after the compensation of described negative pixel values to produce, wherein said compensating factor is based on obtained touch image and described ground connection situation; And
After optionally compensating described in convergent-divergent, image or described touch image are to provide image display consistency.
10. method according to claim 9, after wherein optionally compensating described in convergent-divergent, image or described touch image comprise:
After compensating described in convergent-divergent, image is so that the total energy of image is substantially the same with the total energy of described touch image after described compensation.
11. methods according to claim 10, after wherein compensating described in convergent-divergent, image comprises:
Select to be used for the high pixel value of image after described compensation to be scaled the zoom factor of the high pixel value of described touch image; And
Described zoom factor is applied to whole pixel values of image after described compensation.
12. methods according to claim 9, after wherein optionally compensating described in convergent-divergent, image or described touch image comprise:
Image is touched so that the bulk strength of described touch image is substantially the same with the bulk strength of image after described compensation described in convergent-divergent.
13. methods according to claim 12, wherein touch image and comprise described in convergent-divergent:
Select to be used for be scaled by the high pixel value of described touch image the zoom factor of the high pixel value of image after described compensation; And
Described zoom factor is applied to whole pixel values of described touch image.
14. methods according to claim 9, also comprise:
Determine at least one feature be associated with described touch sensor panel;
Wherein based on the compatibility between determined compensating factor and determined feature, determined compensating factor is applied to described touch image.
15. 1 kinds of touch-sensitive device, comprising:
Comprise the touch sensor panel of multiple touch location, described multiple touch location is for sensing the touch on described touch sensor panel; And
The processor communicated with described touch sensor panel, described processor is configured to the image catching the touch sensed, the image of the wherein said touch sensed comprises one or more touch image value, described processor is also configured to identify the negative value in the described one or more touch image values in the image captured, the boundary of the compensating factor of the image captured described in adjustment is determined based on identified negative value, based on the touch image value in described one or more touch image value being negative value, estimate the compensating factor in determined boundary, wherein negatively touch image value instruction and to touch or close to the user of touch sensor panel or the ground connection situation of object, and the compensating factor wherein estimated to touch or close to the function of the user of touch sensor panel or the ground connection situation of object and estimated touch, and described processor is also configured to use the compensating factor estimated identified negative value to be adjusted to be 0 or to be substantially close to 0.
16. touch-sensitive device according to claim 15, wherein identified negative value being adjusted to is 0 or to be substantially close to 0 be carry out based on the linear relationship between the described image that captures and described compensating factor.
17. touch-sensitive device according to claim 15, wherein said equipment is incorporated at least one in mobile phone, digital media player and personal computer.
18. 1 kinds of terminal devices, comprising:
Comprise the touch sensor panel of multiple touch location, described multiple touch location is for sensing the touch on described touch sensor panel;
The processor communicated with display with described touch sensor panel, described processor is configured to the image catching the touch sensed, the image of the wherein said touch sensed comprises one or more touch image value, described processor is also configured to identify the negative value in the described one or more touch image values in the image captured, the boundary of the compensating factor of the image captured described in adjustment is determined based on identified negative value, based on the touch image value in described one or more touch image value being negative value, estimate the compensating factor in determined boundary, wherein negatively touch image value instruction and to touch or close to the user of touch sensor panel or the ground connection situation of object, and the compensating factor wherein estimated to touch or close to the function of the user of described touch sensor panel or the ground connection situation of object and estimated touch, and described processor is also configured to use the compensating factor estimated identified negative value to be adjusted to be 0 or to be substantially close to 0, and
Display, for showing the image after compensation.
19. 1 kinds for compensating the equipment of negative pixel effect, described equipment comprises:
For the device of at least one boundary based on obtained one or more touch image value determination compensating factors, wherein said one or more touch image value represents the data obtained from touch sensor panel;
For based on the touch image value in described one or more touch image value being negative value, estimate the device of the compensating factor in determined boundary, wherein negatively touch image value instruction and to touch or close to the user of touch sensor panel or the ground connection situation of object, and the compensating factor wherein estimated to touch or close to the function of the user of touch sensor panel or the ground connection situation of object and estimated touch; And
For the compensating factor estimated being applied to the device of described one or more touch image value.
20. equipment according to claim 19, also comprise:
For the compensating factor estimated is applied to described negative touch image value with described negative touch image value is set to 0 or be substantially close to 0 device.
21. equipment according to claim 19, also comprise:
For the compensating factor estimated is applied to on the occasion of touch image value with along positive dirction promote the described device just touching image value.
22. equipment according to claim 19, the device wherein at least one boundary determining compensating factor comprises:
For touching at least one in image value sum and maximum accessible touch image value based on expecting, determine the device of the upper limit of compensating factor; And
For determine the lower limit of described compensating factor be 0 or be substantially close to 0 device.
23. 1 kinds for touching the equipment of image for negative pixel effect compensating, described equipment comprises:
For obtaining the device touching image from touch sensor panel;
For the device of at least one boundary based on obtained touch image value determination compensating factor;
For analyzing the negative pixel values of touch image to determine the device of the compensating factor in determined boundary, the ground connection situation of described negative pixel values instruction touch or the object close to described touch sensor panel;
For determined compensating factor being applied to described touch image to produce the device substantially all not having image after the compensation of described negative pixel values, wherein said compensating factor is based on obtained touch image and described ground connection situation; And
For image or described touch image after optionally compensating described in convergent-divergent to provide the device of image display consistency.
24. equipment according to claim 23, also comprise:
For determining the device of at least one feature be associated with described touch sensor panel;
Wherein based on the compatibility between determined compensating factor and determined feature, determined compensating factor is applied to described touch image.
CN201010529723.2A 2010-01-21 2010-10-28 Negative pixel compensation method and device, touch sensor device and terminal device Active CN102135827B (en)

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PCT/US2010/049001 WO2011090514A1 (en) 2010-01-21 2010-09-15 Touch sensor panel negative pixel compensation

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