CN101825976B - Ghost detecting method of capacitive touch control plate - Google Patents
Ghost detecting method of capacitive touch control plate Download PDFInfo
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- CN101825976B CN101825976B CN2009101266270A CN200910126627A CN101825976B CN 101825976 B CN101825976 B CN 101825976B CN 2009101266270 A CN2009101266270 A CN 2009101266270A CN 200910126627 A CN200910126627 A CN 200910126627A CN 101825976 B CN101825976 B CN 101825976B
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Abstract
The invention relates to a ghost detecting method of a capacitive touch control plate. A ghost phenomenon occurs in the first position and the second position of the capacitive touch control plate. The detecting method comprises steps that: an X-direction trace and a Y-direction trace in the first position and the second position are driven in a crossed way by synchronous signals of the same phase or different phases for obtaining capacitance values of the first position and the second position; and the better capacitance value is matched with crossed alignment for correctly distinguishing practical positions of fingers.
Description
Technical field
The present invention is relevant a kind of capacitive touch control plate, particularly about a kind of ghost detecting method of capacitive touch control plate.
Background technology
In numerous touch technologies, twin shaft (the Axis Intersect that interlocks; AI) type array projection type capacitance (Projected Capacitance) detection technology; Owing to have the characteristic that penetrability (Optical clarity) is high, durable, cost is low; Become most popular technology; But its scan mode can might produce ghost point (Ghost-Point) when two fingers or the many fingers touch-control more than two fingers, thereby the tram that can't differentiate every finger.
Fig. 1 is the synoptic diagram of ghost phenomenon; When two positions of finger on capacitive touch control plate of user are upper left bottom right (A; D) or down upper right (C is in the time of B), in trace Y1, Y2 and trace X1, the last capacitance variations that causes of X2 on a left side; Therefore the detected directions X capacitance variation of control circuit waveform all is the same with Y direction capacitance variation waveform, so control circuit can't be judged real finger contact position.
Under two finger input states, possible coordinate had two groups when the ghost phenomenon took place, and is as shown in Figure 2.When the ghost phenomenon took place, the capacitance of directions X was at trace x
1And x
2Changing appears in the place, and the capacitance of Y direction is then at trace y
1And y
2The place increases, exclude permutation and combination with identical X or Y coordinate after, possible finger coordinate has (x
1y
1, x
2y
2) and (x
1y
2, x
2y
1) two groups, wherein one group is actual coordinate, another group then is the ghost coordinate.When more fingers are imported, the quantity of ghost coordinate will increase sharply, and will be for example shown in Figure 3, and when three referred to input, possible finger coordinate had (x
1y
1, x
2y
2, x
3y
3), (x
1y
1, x
2y
3, x
3y
2), (x
1y
2, x
2y
1, x
3y
3), (x
1y
2, x
2y
3, x
3y
1), (x
1y
3, x
2y
2, x
3y
1), (x
1y
3, x
2y
1, x
3y
2) six groups, wherein five groups is the ghost coordinate.
Refer to that using (Multi-touch) must be one of development trend of following touch technology, therefore, is desirable to provide a kind of ghost detecting method that improves ghost point problem in the known AI type array projection type capacitance detection technology more.
Summary of the invention
One of the object of the invention is to propose a kind of ghost position Detection method.
According to the present invention, the ghost phenomenon occurs one of in primary importance and the second place of a kind of ghost position Detection method on said capacitive touch control plate, and said primary importance and the said second place have identical first direction coordinate time:
(A) drive the first direction trace of said primary importance with first signal, and drive the second direction trace of said primary importance with the secondary signal of said first signal Synchronization;
(B) obtain first or second direction trace capacitances value of said primary importance;
(C) drive the first direction trace of the said second place with said first signal, and drive the second direction trace of the said second place with said secondary signal;
(D) obtain first or second direction trace capacitances value of the said second place; And
(E) according to first or second direction trace capacitances value of first or the second direction trace capacitances value and the said second place of said primary importance, judge the actual contact position.
Change ground, said first and second signal is homophase or out-of-phase signal synchronously synchronously each other.
The preferably does the intersection adjustment to the trace on the said capacitive touch control plate, so that each trace obtains identical basic capacitance.
Description of drawings
Fig. 1 is the synoptic diagram of ghost phenomenon;
Fig. 2 is two synoptic diagram that refer to the ghost phenomenon that touch-control causes;
Fig. 3 three refers to the synoptic diagram of the ghost phenomenon that touch-controls cause;
Fig. 4 and Fig. 5 are the synoptic diagram of one embodiment of the invention;
Fig. 6 and Fig. 7 are the synoptic diagram of another embodiment of the present invention;
Fig. 8 is the synoptic diagram of electric capacity on the two crossing traces;
Fig. 9 and Figure 10 are the synoptic diagram that detects capacitance one embodiment between two traces;
Figure 11 is a process flow diagram of using one embodiment of the invention;
Figure 12 is the synoptic diagram of the same staggered driving that proposes of the present invention;
Figure 13 reads the different synoptic diagram of value difference with the ADC that staggered driving causes;
Figure 14 is the synoptic diagram of the intersection adjustment that proposes of the present invention;
Figure 15 is the synoptic diagram that the different thicknesses finger causes the ghost phenomenon;
Figure 16 is a synoptic diagram of using capacitive touch control plate one embodiment of the present invention; And
Figure 17 is the process flow diagram that detects ghost phenomenon one embodiment of Figure 15.
Drawing reference numeral
12 fingers
14 fingers
16 tested positions
200 beginnings
201X direction trace detects
202Y direction trace detects
Do 203 ghosts take place?
204 finish
205 produce the ghost candidate list
206 get a bit in said ghost candidate list
The last point that 207 said points are the ghost candidate list?
208 output answer tabulations
209 ghosts are analyzed sensing
210 said points are the ghost point
211 remove said point from said ghost candidate list
212 add answer with said point tabulates
213 remove the candidate point with said identical X of tool or Y coordinate from said ghost candidate list
30 capacitive touch control plates
32 inductors
34 simulation multiplexers
36 modulators
38 detuners
40 voltage treatment circuits
501 general adjustment
502 intersection adjustment
503 Trackpads scan
Are 504 finger numbers on first and second directions greater than 2?
505 are judged to be and singly refer to use
506 find out Y direction trace Y1 and the Y2 that capacitance variations occurs
507 find out the peaked stitching Xmax of tool on the directions X
508 with signal Mux2 driving trace Y1, and detects trace X_max with signal Mux1
509 obtain and store the ADC value ADC_Y1 of trace Y1
510 with signal Mux2 driving trace Y2 and with signal Mux1 detection trace X_max
511 obtain and store the ADC value ADC_Y2 of trace Y2
512ADC_Y1＞ADC_Y2?
513 the finger physical locations (Xmax, Y1) and (Xmin, Y2)
514 the finger physical locations (Xmax, Y2) and (Xmin, Y1)
515 are judged to be to refer to application more
Embodiment
Fig. 4 is the synoptic diagram of first embodiment of the invention, and the coordinate of finger 12 is with x
my
kExpression, the coordinate of finger 14 is then with x
ny
lExpression, finger 12 and finger 14 cause capacitance variations value on the capacitive touch control plate in the position x
my
l, x
my
k, x
ny
lAnd x
ny
kPeak value all occurs, produce the ghost phenomenon, it is to be positioned at x that the control circuit end can't be differentiated finger 12
my
lOr x
my
k, also can't judge that finger 14 is to be positioned at x
ny
lOr x
ny
k, two groups of ghost candidate coordinate (x appear this moment
my
l, x
ny
k) and (x
my
k, x
ny
l), position x
my
l, x
my
k, x
ny
lAnd x
ny
kBe the ghost position candidate.The present invention proposes a kind of ghost detecting method, when the ghost phenomenon occurring, the position of peak value one by one each occurred, and promptly X on each ghost position candidate and Y direction trace charge simultaneously and carry out capacitance and detect.When to tested position 16 (x
my
k) when detecting, switch S 1 is shut with S3, the controller (not shown) is simultaneously to trace x
mAnd y
kCharging obtains trace x
mAnd y
kCapacitance.Trace x
mOn capacitance Cx be Cx
m+ Cx
my
l+ dCx
m+ Cx
my
k, dCx
mExpression trace x
mBecause of pointing 12 near the capacitance variations that produces, Cx
mRepresent other ground connection traces and ground connection and trace x
mBetween capacitance sum total, Cx
my
lExpression trace x
mWith trace y
1Between capacitance, Cx
my
kExpression trace x
mWith trace y
kBetween capacitance, wherein because trace x
mWith trace y
kEquipotential, Cx
my
kMeasured value be zero.Because tested position 16 is positions of finger 12 actual contact, from trace x
mOn the capacitance sum total Cx that measures equal physical location capacitance Cr
x=Cx
m+ Cx
my
l+ dCx
mFrom trace y
kThe Y direction trace capacitances value Cy that records also since finger 12 actual contact position at x
my
k, its capacitance of measuring is physical location capacitance Cr
y=Cy
k+ Cx
ny
k+ dCy
k
Fig. 5 illustrates when pointing 12 actual contact positions at x
my
l, the synoptic diagram when tested position 16 is the ghost position, controller is the same simultaneously to trace x
mWith trace y
kCharging, trace x
mAnd y
kEquipotential, so Cx
my
kMeasured value be zero, but the position is at x
my
lFinger 12 make trace y
1With trace x
mBetween produce capacitance variations dCx
my
l, dCx
my
lBe negative value, at this moment trace x
mOn capacitance sum total Cx equal ghost position capacitance Cg
x=Cx
m+ Cx
my
l+ dCx
my
l+ dCx
mFrom trace y
kThe Y direction capacitance Cy that records is because point 14 at x
ny
k, at trace x
nAnd y
kBetween cause negative capacitance variations dCx
ny
k, the capacitance Cy that therefore records is ghost position capacitance Cg
y=Cy
k+ Cx
ny
l+ dCx
ny
k+ dCy
k
The directions X capacitance and the Y direction capacitance of Fig. 4 and Fig. 5 acquisition are compared mutually, because dCx
my
lBe negative value, the directions X capacitance Cr that physical location records
x=Cx
m+ Cx
my
l+ dCx
mThe directions X capacitance that records greater than the ghost position is Cg
x=Cx
m+ Cx
my
l+ dCx
my
l+ dCx
m, identical ground is because dCx
ny
kBe negative value, the Y direction capacitance Cr that physical location records
y=Cy
k+ Cx
ny
k+ dCy
kThe Y direction capacitance Cg that also records greater than the ghost position
y=Cy
k+ Cx
ny
k+ dCx
ny
k+ dCy
kIn brief, accomplish said the XY trace charged simultaneously and obtain X and Y direction capacitance after, the capacitance of 2 gained is compared, promptly distinguishable what person is the actual contact position.
Fig. 6 and Fig. 7 are another embodiment of ghost detecting method of the present invention, the directions X trace of tested position are connected with Y direction trace, with the directions X trace capacitances value that directly obtains tested position and the sum total of Y direction trace capacitances value.As shown in Figure 6, when tested position 16 is finger 12 physical locations, the capacitance Cx that records
yBe physical location capacitance Crx
y=Cx
m+ Cyk+Cx
my
l+ Cx
ny
k+ dCx
m+ dCy
k, with reference to Fig. 7, when tested position 16 is not the finger physical location, the capacitance Cx that records
yBe ghost position capacitance Cgx
y=Cx
m+ Cy
k+ Cx
my
l+ Cx
ny
k+ dCx
m+ dCy
k+ dCx
my
l+ dCx
ny
k, dCx wherein
my
lAnd dCx
ny
kBe negative value.Though two refer to that the ghost phenomenon that touch-control causes has four ghost position candidate; But because after making first physical location; The ghost position candidate that has identical X or Y coordinate with said physical location just can not be second physical location; Therefore when the ghost phenomenon that detection two finger touch-controls cause, only need do once and compare, can know the coordinate of physical location the ghost position candidate of two identical X of tool or Y coordinate.
Handle three when referring to ghost phenomenon that touch-controls cause with said detection method, the ghost position candidate is 9 points, and with reference to Fig. 3, in said these ghost position candidate, respectively there are 3 points the position with identical X coordinate, has two point (x of identical X coordinate with test earlier
1, y
1) and (x
1, y
2) be example, if the capacitance that test obtains equates expression (x
1, y
1) and (x
1, y
2) 2 be all the ghost position, residue and said 2 (x with identical X coordinate
1, y
3) be physical location; If the capacitance that test obtains is unequal, the bigger said point of capacitance is physical location, therefore only need detect once and can make first physical location.Make first physical location, for example judging (x
1, y
3) be physical location after, can learn other and (x1 y3) has the ghost position candidate (x of identical X coordinate or Y coordinate
1, y
1), (x
1, y
2), (x
2, y
3) and (x
3, y
3) must be all the ghost position, therefore can directly get rid of more said ghost position, then again to ghost position candidate (x
2, y
2), (x
2, y
1) do ghost and detect; After judging second physical location, the deletion and the ghost position candidate of said identical X of the second physical location tool or Y coordinate can obtain last physical location again; In other words; Even in the ghost phenomenon that three refer to cause, the detection method that the present invention proposes only need be carried out twice relatively, can make the actual finger coordinate.In other embodiments, can also detect each ghost candidate point one by one, obtain the trace capacitances value of each ghost candidate point, make a decision according to said these trace capacitances values by firmware again, to promote fiduciary level.
Fig. 8 is the synoptic diagram of electric capacity on the two crossing traces, the Cx here
mExpression trace x
mCapacitance over the ground, Cy
nExpression trace y
nCapacitance over the ground, Cx
my
nExpression trace x
mWith trace y
nBetween coupling capacitance, as finger contact point trace line x
mAnd y
nDuring intersection, capacitance Cx
my
nTo descend, the present invention proposes a kind of direct detection trace x
mWith trace y
nBetween capacitance Cx
my
nMethod, to differentiate ghost position and actual contact position.At first, simultaneously to trace x
mAnd y
nCharging, and detect trace x
mOn capacitance, this moment trace x
mAnd y
nEquipotential, Cx
my
nMeasured value be zero, the capacitance that records is trace x
mCapacitance Cx over the ground
mThen again to trace x
mThe charging and with trace y
nGround connection, trace x at this moment
mAnd y
nTherefore equipotential does not detect trace x
mThe capacitance of gained is Cx
m+ Cx
my
n, both subtract each other can obtain trace x
mAnd y
nBetween coupling capacitance Cx
my
n
Fig. 9 and Figure 10 are for detecting the synoptic diagram of capacitance one embodiment between two traces, and Fig. 9 illustrates the situation when tested position 16 is finger 12 physical locations, and Figure 10 illustrates the situation when tested position 16 is the ghost position.As shown in Figure 9, when tested position 16 during for finger 12 physical locations, at first at phase1 simultaneously to trace x
mAnd y
kCharging detects trace x this moment
mThe capacitance Cx=Cx that obtains
mThen, in phase 2 to trace x
mThe charging and with trace y
kGround connection is obtained trace x
mOn capacitance Cx=Cx
m+ Cx
my
k+ dCx
my
kIt is physical location electric capacity difference DELTA Cr that the capacitance that capacitance that phase 2 is obtained and phase 1 obtain subtracts each other the electric capacity difference DELTA Cx that obtains
x=Cx
my
k+ dCx
my
kWhen tested position 16 is the ghost position, shown in figure 10, said detection is carried out in tested position 16, the electric capacity difference DELTA Cx that obtains is ghost position electric capacity difference DELTA Cg
x=Cx
my
k, wherein, dCx
my
kLess than zero, so the judgement of actual finger position can be reached through comparing electric capacity difference DELTA Cx.Each embodiment that the present invention proposes realizes said computing with firmware, in other embodiments, can the error that finger and trace etc. cause be added computing.
Figure 11 is a process flow diagram of using touch plate control method one embodiment of the present invention, after the beginning 200, carries out the directions X trace earlier and detects 201, then carries out Y direction trace and detects 202, has judged whether that ghost takes place 203, and if not, the output testing result also finishes 204.In step 203,, then get into the ghost handling procedure if find to have ghost to take place; At first produce ghost candidate list 205, all ghost candidate points are added in the said ghost candidate list, in step 206, from said ghost candidate list, get a ghost candidate point then; And judge whether said point is the last point 207 of said ghost candidate list, if, output answer tabulation 208; If not, carry out ghost and analyze sensing 209.The step that ghost is analyzed sensing 209 obtains the directions X trace capacitances value that receives measuring point, Y direction trace capacitances value, both add the capacitance of the General Logistics Department or receive capacitance between the X, Y direction of measuring point as previously mentioned, compares with the capacitance of obtaining from other candidate points again; Judging whether the said measuring point that receives is ghost point 210, if, just remove the said measuring point 211 that receives from said ghost candidate list; And get back to step 206, continue other candidate points are done detection and judgement, if not; Represent that the said measuring point that receives is a physical location; Just the said measuring point that receives is added answer tabulation 212, and from said ghost candidate list remove said point and with the candidate point 231 of said identical X of tool or Y coordinate, return step 206 and continue other candidate points in the ghost candidate list are detected; The tabulation of output answer at last 208 finishes 204.In the present embodiment, the position of each ghost candidate point is all with XY coordinate representation, and therefore the tabulation of the answer of last output has comprised the XY coordinate of answer point, and accurate contact point station-keeping ability can be provided.
The present invention also proposes a kind of with staggered (In-Phase Crisscross) method of driving, so that the basic capacitance on the cross-point (receiving measuring point) diminishes, thus; Receive the height of measuring point capacitance to change more obvious; Be beneficial to actual circuit control, shown in figure 12, detect (XN; When the capacitance YN) is judged to carry out described staggered driving; Control circuit drives trace XN with signal Mux1, drives trace YN with the signal Mux 2 with signal Mux1 homophase simultaneously, detects trace XN to obtain the capacitance on it.Figure 13 reads the different synoptic diagram of value difference with the ADC that staggered driving causes, and drives trace X1 with signal Mux1, and drives trace Y1 and Y2 respectively with in-phase signal Mux2; Receiving measuring point A is finger actual contact position, therefore with staggered driving trace X1 and Y2 the time, detects ADC (the Analog-to-Digital Converter that trace X1 obtains; Analog to digital conversion) value of reading is high; Be judged as logic High (1), receiving measuring point C is the ghost position, therefore with staggered driving trace X1 and Y1 the time; The ADC value of reading that detects trace X1 acquisition is low, is judged as logic Low (0).
Because the capacitance difference that described staggered driving detects between physical location and ghost position is little; The present invention proposes a kind of adjustment (Calibration) method; In adjustment flow process originally, increase intersection adjustment (Intersectional Calibration) step of a single shaft; Further to promote the accuracy that detects, Figure 14 is its synoptic diagram.Drive wherein trace YM of Y axle with signal Mux2; And drive and scan all X-direction traces with signal Mux1; Obtain the ADC value of each bar trace; Offer the parameter of modulator (Modulator), supply modulation value and DAC value on the calibration trace, make ADC (Analog-to-Digital Converter) value of reading of every trace be in identical accurate position as follow-up adjustment.
Because the present invention is a physical location of judging a finger earlier; Derive the position of another finger again; For reducing error rate because of the too big generation of finger thickness gap, with reference to Figure 15, the present invention select with X axle induction amount the finger of big (X_max) as first finger judging.
Figure 16 is a synoptic diagram of using capacitive touch control plate one embodiment of the present invention; Have a plurality of inductors 32 on the capacitive touch control plate 30,32 of inductors have lead to link to each other longitudinally, form trace (trace) X1, X2 ... XM; Horizontal inductor 32 is formed trace Y1, Y2 equally respectively ... YM; The trace that the current signal that modulator 36 produces will be connected to through 34 selections of simulation multiplexer, modulation becomes signal mux1 and mux2, because present embodiment increases described intersection alignment step in adjustment flow process originally; Therefore after producing known 1st modulation parameter and 1st DAC parameter; 2nd modulation parameter and 2nd DAC parameter that the alignment step of intersecting provides also offer modulator 36, ADC value of reading of auxiliary every trace of adjustment, and owing to use with staggered driving; The detuner 38 of present embodiment needs with the extra reference signal Mux_Vref restituted signal mux1 that provides; Produce signal ppeak and npeak and give voltage treatment circuit 40, voltage treatment circuit 40 is changed the voltage difference between signal ppeak and npeak again, to obtain the capacitance variations information on the capacitive touch control plate 10.Modulator is a known technology with the basic capacitance of modulation parameter and DAC parameter adjustment trace, has the knack of the affiliated art of the present invention when knowing.
In other embodiments, can also use synchronously but the signal of out-phase as Mux1 and Mux2, carry out described staggered driving and intersect adjustment to differentiate ghost position and physical location.
Figure 17 is the process flow diagram that detects ghost phenomenon one embodiment of Figure 15, and in Figure 15, the finger that A is ordered is than D point thick fingers, so the capacitance that A is ordered is big than the D point.At first, obtain the 1st modulation parameter and the 1st DAC parameter of each trace on the capacitive touch control plate with known general adjustment 501, then adjustment 502 obtains 2nd modulation parameter and 2nd DAC parameter offers modulator to intersect; Make after each trace has identical ADC value of reading on the capacitive touch control plate; Trackpad is scanned 503, and whether the finger number of judgement on X and Y axle be greater than 2504, if not; Judge and for singly referring to use 505, get back to step 503 this moment; If not, get into staggered driver.In staggered driver; Find out Y direction trace Y1 and Y2 506 that capacitance variations occurs earlier, then find out the peaked trace Xmax of tool (X1) 507 on the directions X, then in step 508, drive trace Y1 with signal Mux2; And with signal Mux1 detection trace Xmax; Obtain and store the ADC value ADC_Y1 of trace Y1 in step 509, then, drive trace Y2 and detect trace X_max with signal Mux2 in step 510 again with signal Mux1; Obtain and store the ADC value ADC_Y2 511 of trace Y2, judge that whether ADC_Y1 is greater than ADC_Y2 512; If, judge finger position (Xmax, Y1), (Xmin, Y2) 513; If not, judge finger position (Xmax, Y2), (Xmin, Y1) 514, judge finger position after, judging current be how finger application 515, gets back to step 503 and continues to scan Trackpad.
More than the narration done for preferred embodiment of the present invention be purpose for illustrating; And be not intended to limit the present invention accurately is the form that is disclosed; Based on above instruction or to make an amendment or change from embodiments of the invention imitations be possible; Embodiment is for explaining orally principle of the present invention and let those of ordinary skill in the art utilize the present invention in practical application, to select with various embodiment and narrate, and technological thought attempt of the present invention is decided by claim and equalization thereof.
Claims (5)
1. the ghost detecting method of a capacitive touch control plate; It is characterized in that; The ghost phenomenon occurs one of in the primary importance on the said capacitive touch control plate and the second place, the said primary importance and the said second place have identical first direction coordinate, and said detection method comprises the following steps:
(A) drive the first direction trace of said primary importance with first signal, and drive the second direction trace of said primary importance with secondary signal with said first signal Synchronization;
(B) obtain first or second direction trace capacitances value of said primary importance;
(C) drive the first direction trace of the said second place with said first signal, and drive the second direction trace of the said second place with said secondary signal;
(D) obtain first or second direction trace capacitances value of the said second place; And
(E) according to first or second direction trace capacitances value of first or the second direction trace capacitances value and the said second place of said primary importance, judge the actual contact position.
2. ghost detecting method as claimed in claim 1 is characterized in that, said secondary signal and said first signal Synchronization and homophase.
3. ghost detecting method as claimed in claim 1 is characterized in that, said secondary signal and said first signal Synchronization but out-phase.
4. ghost detecting method as claimed in claim 1 is characterized in that, step (E) comprising:
First or second direction trace capacitances value of first or the second direction trace capacitances value and the said second place of more said primary importance;
If first or second direction trace capacitances value of said primary importance judge that greater than first or second direction trace capacitances value of the said second place said primary importance is the actual contact position; And
If the first direction trace capacitances value of said primary importance judges that less than the first direction trace capacitances value of the said second place the said second place is the actual contact position.
5. ghost detecting method as claimed in claim 1 is characterized in that said method more comprises the following steps:
Drive arbitrary second direction trace on the said capacitive touch control plate with said secondary signal;
Drive and scan first direction traces all on the said capacitive touch control plate with said first signal; And
Obtain the capacitance of each said first direction trace, for the basic capacitance of each trace on the said capacitive touch control plate of adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101266270A CN101825976B (en) | 2009-03-05 | 2009-03-05 | Ghost detecting method of capacitive touch control plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101266270A CN101825976B (en) | 2009-03-05 | 2009-03-05 | Ghost detecting method of capacitive touch control plate |
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| Publication Number | Publication Date |
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| CN101825976A CN101825976A (en) | 2010-09-08 |
| CN101825976B true CN101825976B (en) | 2012-08-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM422118U (en) * | 2010-12-30 | 2012-02-01 | Egalax Empia Technology Inc | Capacitive touch screen |
| KR102112092B1 (en) * | 2013-12-31 | 2020-05-19 | 엘지디스플레이 주식회사 | Touch sensing system |
| CN105739795B (en) * | 2014-12-12 | 2018-09-21 | 宸鸿科技(厦门)有限公司 | Capacitance type touch-control panel and its sensing method of touch control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006046688A1 (en) * | 2004-10-29 | 2006-05-04 | Sharp Kabushiki Kaisha | Coordinate detecting device, display device and coordinate detecting method |
| CN101201714A (en) * | 2006-12-11 | 2008-06-18 | 义隆电子股份有限公司 | Touch pad and position sensing method for the same |
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitance touch control device and method for recognizing different contact position |
-
2009
- 2009-03-05 CN CN2009101266270A patent/CN101825976B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006046688A1 (en) * | 2004-10-29 | 2006-05-04 | Sharp Kabushiki Kaisha | Coordinate detecting device, display device and coordinate detecting method |
| CN101201714A (en) * | 2006-12-11 | 2008-06-18 | 义隆电子股份有限公司 | Touch pad and position sensing method for the same |
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitance touch control device and method for recognizing different contact position |
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|---|---|
| CN101825976A (en) | 2010-09-08 |
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