CN102331893A - Method for calibrating coordinates of touch screen - Google Patents
Method for calibrating coordinates of touch screen Download PDFInfo
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- CN102331893A CN102331893A CN2011102691886A CN201110269188A CN102331893A CN 102331893 A CN102331893 A CN 102331893A CN 2011102691886 A CN2011102691886 A CN 2011102691886A CN 201110269188 A CN201110269188 A CN 201110269188A CN 102331893 A CN102331893 A CN 102331893A
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Abstract
The present invention relates to a method for calibrating coordinates of a touch screen. The method includes: providing a display panel which includes a plurality of display coordinates along a first axis, wherein the display coordinates includes a maximum display coordinate; providing a capacitive sensor which includes a plurality of sensing electrodes corresponding to a plurality of sensing coordinates along the first axis, wherein the capacitive sensor includes a maximum sensing coordinate; detecting a plurality of digital values corresponding to each of sensing electrodes when the capacitive sensor is touched; multiply the digital values and their corresponding sensing coordinates to obtain a weighting value; dividing the weighting value by the maximum sensing coordinate to obtain an interpolated value; and multiply the interpolated value and the maximum display coordinate to obtain a calibrated coordinate.
Description
The application is to be on June 30th, 2008 applying date, and application number is 200810127253.X, and denomination of invention is divided an application for the patented claim of " coordinate calibration method of touch control screen ".
Technical field
The invention relates to a kind of index location technology, and particularly relevant for a kind of coordinate calibration method of touch control screen.
Background technology
In recent years, because development of science and technology is quick, handheld apparatus; For example intelligent mobile phone, personal digital assistant (Personal Digital Assistant; PDA), satellite navigation system (Global Position System, GPS) or the like, also and then more and more universal.Because said apparatus all is to use touch control screen, so the ten minutes that the technology of the calibrating coordinates of touch sensor and display device becomes is important.In the past, the touch sensor generally is to use resistance sensor.This kind resistance sensor must come the coordinate of sensing index on the fluorescent screen by depended on pressure.Because this kind handheld apparatus typically uses the liquid crystal fluorescent screen at present, and resistance sensor must be overlapping with the liquid crystal fluorescent screen.Therefore when being urged to resistance sensor, the relative liquid crystal fluorescent screen that also just has been urged to.Go down for a long time, the liquid crystal fluorescent screen is damage therefore.In addition, the resolution of resistance sensor is lower, usually has the inaccurate situation of coordinate setting and takes place.
In the prior art, also having a kind of touch sensor, is exactly capacitance type sensor.Capacitance type sensor is in the touch control screen that is applied in handheld apparatus at present widely.Yet, when capacitance type sensor is applied in touch control screen, because the configuration of the coordinate of capacitive touch control plate, does not match with the configuration of the coordinate of display, thereby exist the problem of accuracy.
Summary of the invention
In view of this, a purpose of the present invention is exactly that a kind of coordinate calibration method of touch control screen is being provided, in order to the configuration of the coordinate that solves capacitive touch control plate, with the unmatched problem of configuration of the coordinate of display.
Another object of the present invention is exactly that a kind of coordinate calibration method of touch control screen is being provided, and uses so that the coordinate conversion of capacitance type sensor is the coordinate of display panel.
For reaching above-mentioned or other purposes, the present invention proposes a kind of coordinate calibration method of touch control screen, comprises the following steps: to provide a display panel, and at first direction of principal axis, this display panel comprises a plurality of displaing coordinates and one first displaing coordinate sum; One capacitance type sensor is provided, and at first direction of principal axis, this capacitance type sensor has disposed a plurality of induction electrodes, and the corresponding one by one a plurality of induction coordinate figures of difference, and wherein this capacitance type sensor has a maximum induction coordinate figure; When capacitance type sensor is touched, detect the pairing digit value of each induction electrode; The pairing induction coordinate figure of each induction electrode is multiplied by the pairing digit value of said induction electrode obtains an addition value; Above-mentioned addition value is obtained an interpolate value divided by the sum total of above-mentioned digit value; And this interpolate value multiply by above-mentioned first displaing coordinate sum, obtain a calibration coordinate divided by said maximum induction coordinate figure afterwards.
In addition, the present invention proposes a kind of coordinate calibration method of touch control screen.The method comprises the following steps: to provide a display panel, and at first direction of principal axis, this display panel comprises a plurality of displaing coordinates and one first displaing coordinate number; One capacitance type sensor is provided; At first direction of principal axis; This capacitance type sensor has disposed a plurality of induction electrodes; And the corresponding a plurality of induction coordinate figures of difference; Wherein this capacitance type sensor has a maximum induction coordinate figure, and the one first specific induction electrode pairing coordinate figure nearest apart from one first edge of this capacitance type sensor be an initial value, and it is identical to respond to coordinate figure apart from the nearest pairing coordinate figure of one second specific induction electrode in one second edge of this capacitance type sensor and this maximum; When first edge is disposed at the minimum displaing coordinate of display panel, and second edge is when being disposed at the maximum displaing coordinate of display panel: the pairing induction coordinate figure of each induction electrode is added a preset coordinate value, replace original induction coordinate figure; And maximum responded to the preset coordinate value that coordinate figure adds twice, and replacement should maximum induction coordinate figure, and wherein, this maximum induction coordinate figure is the coordinate figure at this second edge; Only have when the first nearest specific induction electrode of first edge is touched when detecting: judge that whether the pairing digit value of the first specific induction electrode is greater than a reference number place value; When the pairing digit value of the first specific induction electrode during less than the reference number place value; Ratio according to pairing digit value of the second specific induction electrode and present count place value; Determine one first edge induction coordinate figure; Wherein, induction coordinate figure in first edge drops between this initial value and the pairing induction coordinate figure of the first specific induction electrode; And with first edge induction coordinate figure divided by maximum induction coordinate figure after, be multiplied by first displaing coordinate number, obtain calibrating coordinate; And only have from the second nearest specific induction electrode of second edge when being touched: judge that whether the pairing digit value of the second specific induction electrode is greater than a reference number place value when detecting; When the pairing digit value of the second specific induction electrode during less than the reference number place value; Ratio according to pairing digit value of the second specific induction electrode and present count place value; Determine one second edge induction coordinate figure; Wherein, this second edge induction coordinate figure drops between maximum induction coordinate figure and the pairing induction coordinate figure of the first specific induction electrode; And with second edge induction coordinate figure divided by maximum induction coordinate figure after, be multiplied by first displaing coordinate number, obtain calibrating coordinate.
The present invention proposes a kind of coordinate calibration method of touch control screen, and this touch control screen comprises a display panel and a capacitance type sensor.The method comprises: on first direction of principal axis, the capacitance change that capacitance type sensor is caused according to a touching thing obtains a touching article coordinate; To touch article coordinate and add that a calibration value obtains first coordinate; Determine a conversion proportion in total number of coordinates of the first axial theory and display panel in the first axial resolution according to capacitance type sensor; First coordinate is multiplied by conversion proportion, obtains second coordinate of touching thing corresponding to display panel.
The present invention proposes a kind of coordinate calibration method of touch control screen, and this touch control screen comprises a display panel and a capacitance type sensor.The method comprises: at first direction of principal axis, detect the capacitance change that a touching thing causes capacitance type sensor; Obtain the pairing three-dimensional of capacitance change according to a look-up table; Determine a conversion proportion in total number of coordinates of the first axial theory and display panel in the first axial resolution according to capacitance type sensor; Three-dimensional is multiplied by conversion proportion, obtains the 4-coordinate of touching thing corresponding to display panel.
One side of the present invention is the mode of inserting in utilizing; Come the coordinate between calibration capacitance formula sensor and the display panel not match on the other hand, because capacitance type sensor has a plurality of induction electrodes, each induction electrode all has a preset width; When only marginate induction electrode is touched; Utilize interpolation method just can only calculate the pairing coordinate of edge induction electrode, so possibly cause the edge of display panel to be touched, therefore; Another aspect of the present invention; Then be the pairing digit value of equivalent capacity of utilizing the induction electrode at edge to sense, judge the coordinate at edge, therefore also solved the unmatched problem of configuration with the coordinate of the configuration of the coordinate of capacitive touch control plate and display.
Description of drawings
Fig. 1 is the section of structure of the capacitance touching control fluorescent screen that illustrates according to the embodiment of the invention;
Fig. 2 is the structure top view of the capacitance type sensor 41 that illustrates according to the embodiment of the invention;
Fig. 3 A and Fig. 3 B are respectively the synoptic diagram in order to the localization method of the coordinate of the capacitance type sensor 41 of the explanation embodiment of the invention;
Fig. 4 is the configuration of the coordinate of capacitive touch control plate, with the unmatched synoptic diagram of configuration of the coordinate of display;
Fig. 5 is the range of linearity synoptic diagram of capacitance type sensor of the non-differential sensing formula of the embodiment of the invention;
Fig. 6 is the coordinate translation synoptic diagram of capacitance type sensor of the non-differential sensing formula of the embodiment of the invention;
Fig. 7 A～Fig. 7 C is a conductor when pushing the X axle line of induction on the capacitance type sensor 41, obtains the relativity synoptic diagram of corresponding digit value;
Fig. 8 is the range of linearity synoptic diagram of capacitance type sensor of the differential sensing formula of the embodiment of the invention;
Fig. 9 is the coordinate translation synoptic diagram of capacitance type sensor of the differential sensing formula of the embodiment of the invention;
Figure 10 is the process flow diagram according to the coordinate calibration method of the touch control screen of the embodiment of the invention;
Figure 11 is the process flow diagram according to the coordinate calibration method of the touch control screen of the embodiment of the invention.
Drawing reference numeral:
40: display module
41: capacitance type sensor
X01～X12: induction electrode
C10: control circuit
Embodiment
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Fig. 1 is the section of structure of the capacitance touching control fluorescent screen that illustrates according to the embodiment of the invention.Please refer to Fig. 1, this capacitance touching control fluorescent screen comprises display module 40 and capacitance type sensor 41.Fig. 2 is the structure top view of the capacitance type sensor 41 that illustrates according to the embodiment of the invention.Please refer to Fig. 2, capacitance type sensor 41 comprises a plurality of X axle induction electrode X01～X12 and a control circuit C10.Owing to want positioning index, X axial coordinate and Y axial coordinate must be arranged, at this embodiment the method for locating the X axial coordinate only is provided, Y axial coordinate localization method can be identical with X axial coordinate localization method.Do not repeat them here.
Because capacitance type sensor 41 has two kinds of sensing modes, is respectively non-differential sensing and differential sensing.That is to say that non-differential sensing mode is that each X axle line of induction can obtain one group of digit value relevant with equivalent capacitance value, in general this digit value and conductor refer to finger, touch the area of the X axle line of induction or relevant near the distance of X axle induction electrode.In this embodiment, X axle induction electrode X01～X12 is to be example with 12 lines of induction.In general, can be divided into 64 coordinate positions between the X axle line of induction of each X axle line of induction and vicinity, be example at this with 64, yet according to different application and different precision, coordinate is cut apart also can be different.In addition, the coordinate of first X axle line of induction X01 is 0.Therefore, the X axial coordinate of capacitance type sensor 41 always has 64 * (12-1)+1=705 coordinate.In addition, the differential sensing mode is because per two X axle induction electrodes just can obtain one group of digit value, so the X axial coordinate of capacitance type sensor 41 always has 64 * (12-2)+1=641 coordinate.Below just using non-differential sensing mode how to obtain pointing with explanation as an example touches X axle induction electrode and obtains the X coordinate on capacitance type sensor 41.
Fig. 3 A and Fig. 3 B are respectively the synoptic diagram in order to the localization method of the coordinate of the capacitance type sensor 41 of the explanation embodiment of the invention.Please suppose X axle line of induction X01～X12 when not touched earlier with reference to figure 3A, its corresponding digit value is 0.When the digit value that detects the 6th～8th X axle line of induction X06～X08 is respectively 163,185 and 70, so just can calculates finger and touch the X axial coordinate on the capacitance type sensor 41 with interpolation method:
64×[(6-1)×163+(7-1)×185+(8-1)×70]/(163+185+70)＝369.76。
Next, please refer to Fig. 3 B, when the digit value that detects the 1st X axle line of induction X01 is 200, calculates finger with interpolation method and touch the X axial coordinate on the capacitance type sensor 41:
64×(1-1)×200/200＝0。
The above-mentioned coordinate figure that obtains needs to see through conversion, just can obtain the coordinate figure of display module 40.Yet because in recent years, electronic installation is towards light, thin, short, little development, so the frame of hand-held mobile device does littler and littler, and what cause that capacitance type sensor 41 must be with the viewing area of display module 40 is big or small identical.Yet the line of induction X01～X12 of capacitance type sensor 41 has certain live width respectively.Fig. 4 is the configuration of the coordinate of capacitive touch control plate, with the unmatched synoptic diagram of configuration of the coordinate of display.Please refer to Fig. 4; When finger touches article one X axle induction electrode X01 of capacitance type sensor 41; The coordinate figure that obtains is 0, but induction electrode X01 also has certain distance, this kind situation from the edge of fluorescent screen; If finger points to the edge part 701 of display module 40, can't obtain the coordinate of display module 40 from the coordinate conversion of capacitance type sensor 41.Moreover; If be configured in the central point of article one X axle line of induction X01 the edge of display module 40 actually; When the user touches the frame of product; The user understands article one X axle induction electrode X01 of false touch to capacitance type sensor 41, will cause the induction generation problem of capacitance type sensor 41 in the future.
In order to address the above problem, in an embodiment of the present invention, the calibration steps of the coordinate of a kind of display panel and capacitance type sensor has been proposed.The method acts on two zones respectively, and first zone is the range of linearity, and just 702, the second zones of middle section of display module 40 then are nonlinear areas, just the edge part 701 of display module 40.Below respectively the coordinate conversion in these two zones is explained.Before the method for this embodiment of explanation, the resolution of hypothesis display module 40 is 240 * 320 earlier, and just the X axle has 240 pixels.
Explain the coordinate transformation method of the range of linearity at first, earlier.Fig. 5 is the range of linearity synoptic diagram of capacitance type sensor of the non-differential sensing formula of the embodiment of the invention.Please earlier with reference to figure 5, because the range of linearity refers to the zone that capacitance type sensor 41 can be judged coordinate.At this, suppose the capacitance type sensor that this capacitance type sensor 41 is non-differential sensing formulas earlier, suppose that again the X axle has 12 lines of induction; The Y axle has 16 lines of induction, and can be divided into 64 coordinate positions between the line of induction of each line of induction and vicinity, then can obtain coordinate (1 at this linear zone; 1)～(703; 959), when supposing to orientate the sensor upper left corner as true origin, this moment, linear zone needed through coordinate translation.Fig. 6 is the coordinate translation synoptic diagram of capacitance type sensor of the non-differential sensing formula of the embodiment of the invention.Please refer to Fig. 6, linear zone needs behind coordinate translation, and the coordinate starting point of linear zone is (33,33), and the coordinate terminal point is (735,991).
Owing to can be divided into 64 coordinate positions respectively between the X axle induction electrode of each X axle induction electrode of top hypothesis and vicinity; Therefore; Needing translation at the capacitance type sensor coordinate of the middle position of article one X axle line of induction X01 is 32, and needs translation 704+32=736 at the capacitance type sensor coordinate of the middle position of the 12 X axle induction electrode X12.Suppose to point and push capacitance type sensor 41 like Fig. 6, the X coordinate that obtains on capacitance type sensor 41 is 369.76.Next,,, be multiplied by X axle resolution 240 again, just can obtain the X coordinate of finger presses on display module 40 divided by the theoretical total number of coordinates 64 * 12=768 of capacitance type sensor as long as this coordinate is added after 32.Represent as follows with mathematical expression:
The ÷ 768=133.9875 ≈ 134 of X coordinate=(369.76+32) * 240 (remove 768 earlier and take advantage of 240 again)
Can understand from the above embodiments, the touching article coordinate that the present invention calculates the range of linearity adds a calibration value and obtains one first coordinate.Above-mentioned " translation " makes that the true origin of true origin and display of capacitance type sensor is overlapping.First coordinate is multiplied by a ratio, just converts second coordinate of touching thing on display panel to.
Next, explain the coordinate transformation method of nonlinear area.Fig. 7 A～Fig. 7 C is a conductor when pushing the X axle line of induction on the capacitance type sensor 41, obtains the relativity synoptic diagram of corresponding digit value.Please can be found out by Fig. 7 A and Fig. 7 B earlier with reference to figure 7A and Fig. 7 B, work as conductor, in general be finger, and when big more, the equivalent capacity of line of induction X01 can be big more, relative by the contact area that is pressed in line of induction X01, and obtaining digit value also can be big more.Therefore, in this embodiment, mainly be with the pairing digit value size of article one X axle induction electrode X01 judge the X coordinate be seated in 0～31 which point.
Please refer to Fig. 7 C, when finger presses during at article one X of capacitance type sensor 41 axle line of induction X01, only can obtain the pairing digit value of the line of induction X01 this moment.At this, there is a reference value to be provided with in advance.Explanation supposes that this reference value is 160 for ease.That is to say that when having to the pairing digit value of induction electrode X01, and this numerical value judges then that more than or equal to 160 o'clock the X coordinate is seated in 32.When having to the pairing digit value of induction electrode X01, and this numerical value equals at 80 o'clock, judges that then the X coordinate is seated in 15.Briefly, be exactly size relation according to pairing digit value of induction electrode X01 and above-mentioned reference value, judge the X coordinate.The decision procedure of the foregoing description can be expressed as following form.
Supposing to obtain the X coordinate is 20, as long as calculate according to aforementioned proportion, just can obtain the X coordinate on the fluorescent screen:
X coordinate=20 * 240 ÷ 768=6.25 ≈ 6 (remove 768 earlier and take advantage of 240 again)
Can understand from the foregoing description; True origin in the true origin of nonlinear area and viewing area is overlapping; The present invention utilizes look-up table to obtain the three-dimensional of touching thing on capacitance type sensor; Three-dimensional is multiplied by a ratio, just converts the 4-coordinate of touching thing correspondence on display panel to.
Though the foregoing description is only done computing to the X axial coordinate, those skilled in the art after the foregoing description, should be known in that the Y axial coordinate can also utilize aforesaid way to calculate.So do not repeat them here.
Next, when capacitance type sensor 41 is the capacitance type sensor of differential sensing formula, represent that per two induction electrodes can only obtain one group of digit value.Fig. 8 is the range of linearity synoptic diagram of capacitance type sensor of the differential sensing formula of the embodiment of the invention.Suppose that the X axle line of induction always has 12, the Y axle line of induction has 16, supposes again can be divided into 64 coordinate positions between each line of induction and the contiguous line of induction.Because per two lines of induction can only obtain one group of digit value, so the coordinate range of linear zone before translational coordination not just has only (1,1)～(639,895).Fig. 9 is the coordinate translation synoptic diagram of capacitance type sensor of the differential sensing formula of the embodiment of the invention.Please refer to Fig. 9, then is (65,65)～(713,959) after the translation.The X coordinate range of nonlinear area after translation then becomes 0～64,714～778.
Explain the coordinate transformation method of the range of linearity at first, earlier.Same, suppose that it is 369.76 that control circuit C10 judges the X coordinate.When the X coordinate that will convert on the display module 40, calculate below only needing to do:
(369.76+64) * 240 ÷ 768=135.55 ≈ 136 (remove earlier 768 take advantage of 240 again)
The X coordinate that just can obtain on the display module 40 is 136.
Same reason, when pointing in the inelastic region, for example finger touches the left hand edge of capacitance type sensor 41, and control circuit C10 will only can obtain induction electrode X01 and the pairing digit value of X02 this moment.Have one group of preset value that configures in advance this moment equally.Suppose that this preset value is 192.Briefly, be exactly size relation according to induction electrode X01 and pairing digit value of X02 and above-mentioned reference value, judge the X coordinate.When resulting induction electrode X01 and the pairing digit value of X02 are between 94～96, judge that then the X coordinate is seated in 31.Afterwards, as long as the coordinate that determines is accordinged to proportionate relationship, just can change out the X coordinate on the fluorescent screen:
X coordinate on the fluorescent screen=31 * 240 ÷ 768=9.6875 ≈ 10.(remove 768 earlier and take advantage of 240 again)
By the foregoing description, can put out the calibration steps of following two kinds of coordinates in order.Figure 10 and Figure 11 are the process flow diagrams according to the coordinate calibration method of the touch control screen of the embodiment of the invention.Please earlier with reference to Figure 10, Figure 10 is hypothesis linear zone and the just overlapping situation in viewing area, and the method comprises the following steps:
Step S1000: beginning.
Step S1001: a display panel is provided, and at first direction of principal axis, this display panel comprises a plurality of displaing coordinates and one first displaing coordinate number.For example above-mentioned display module 40, its resolution are 240 * 320.The X axle has 240 pixels, just 240 coordinates.Its maximum displaing coordinate then is 239.
Step S1002: a capacitance type sensor is provided, and at first direction of principal axis, capacitance type sensor has disposed a plurality of induction electrodes, and the corresponding a plurality of induction coordinate figures of difference, and wherein capacitance type sensor has a maximum induction coordinate figure.For example above-mentioned capacitance type sensor 41, at this with capacitance type sensor of non-differential sensing formula for example, it has disposed 12 induction electrode X01～X12, X01 respective coordinates 0, X02 respective coordinates 64 ..., X12 respective coordinates 704.Its maximum displaing coordinate then is 704.
Step S1003: judge whether capacitance type sensor is touched.If not, then returning step S1003 continues to detect.When being judged as when being, then carry out step S1004.
Step S1004: detect the pairing a plurality of digit value of each induction electrode.Shown in Fig. 3 A, work as conductor, when for example finger touched induction electrode X06 on the capacitance type sensor～X08, it was 163 that X06 has corresponding digit value; It is 185 that X07 has corresponding digit value; It is 70 that X08 has corresponding digit value.
Step S1005: said these digit value are multiplied by the pairing induction coordinate figure of each induction electrode obtain an addition value.Next, just above-mentioned digit value 163 multiply by 5 * 64; 185 multiply by 6 * 64; 70 multiply by 7 * 64.Therefore, just obtaining the addition value is 154560.
Step S1006: this addition value is obtained an interpolate value divided by the sum total of above-mentioned digit value.Next, it is 369.76 that above-mentioned addition value 154560 just can be obtained interpolate value divided by (163+185+70), and this interpolate value is equivalent to the coordinate of conductor touch capacitor type sensor.
Step S1007: this interpolate value divided by after the maximum induction coordinate figure, multiply by first displaing coordinate number and obtains a calibration coordinate.
Step S1008: finish.
Certainly, this example only may be implemented in display panel configurations when the linear zone of capacitance type sensor.When the edge of the edge of capacitance type sensor and viewing area compact configuration, the method for the embodiment of the invention just can change following steps into:
Step S1100: beginning.
Step S1101: the display panel like above-mentioned step S1001 is provided.
Step S1102 a: capacitance type sensor is provided; At first direction of principal axis; Capacitance type sensor has disposed a plurality of induction electrodes; And the corresponding a plurality of induction coordinate figures of difference; Wherein capacitance type sensor has a maximum induction coordinate figure, and the one first specific induction electrode pairing coordinate figure nearest apart from one first edge of capacitance type sensor be an initial value, apart from the nearest pairing coordinate figure of one second specific induction electrode in one second edge of capacitance type sensor with maximum to respond to coordinate figure identical.
Step S1103: the pairing induction coordinate figure of each induction electrode is added a preset coordinate value, replace original induction coordinate figure.By the foregoing description, can know that because induction electrode has certain width, in addition, owing to have 64 induction coordinates between the two adjacent induction electrodes, therefore, the edge should differ 32 to the center of the nearest induction electrode of isolated edge and respond to coordinates.So at this embodiment, the pairing induction coordinate figure of each induction electrode adds that preset coordinate value 32 is to replace original induction coordinate figure.
Step S1104: maximum is responded to the preset coordinate value that coordinate figure adds twice, replace maximum induction coordinate figure.As a same reason, original maximum coordinates value adds that 64 replace original maximum induction coordinate figure.
Step S1105: judge whether capacitance type sensor is touched.When capacitance type sensor is not touched, get back to step S1106 and continue to judge.Be then to arrive step S1107 when being judged as.
Step S1106: judge whether that only marginate induction electrode is touched.When being judged as not, to step S1108.When being judged as when being, to step S1109.
Step S1107: carry out above-mentioned steps S1004～S1007 to obtain calibrating coordinate.If with the embodiment of above-mentioned Fig. 3 A, above-mentioned steps is equivalent to add the above-mentioned interpolate value that calculates 369.76 after 32, is being multiplied by the maximum X coordinate 240 of display panel, afterwards again divided by the revised maximum coordinates 768 of capacitance type sensor.So just can obtain the calibration coordinate 134 of aforesaid X axle.
Step S1108: judge that first edge is touched or second edge is touched.At this embodiment, first edge refers to from the nearest edge of display panel X axial coordinate 0; Second edge refers to from the nearest edge of display panel X axial coordinate 239.When first edge is touched, execution in step S1110; When second edge is touched, execution in step S1114.
Step S1109: judge that whether the pairing digit value of the first specific induction electrode is greater than a reference number place value.As stated, because by the contact area that is pressed in the line of induction X01 when big more, the equivalent capacity of line of induction X01 can be big more, relative, obtaining digit value also can be big more.Therefore, the foregoing description is to preset 160 as a reference number place value.This value is normally set with experiment or slip-stick artist's experience.
Step S1110:, judge that then the calibration coordinate is the pairing coordinate of the first specific induction electrode when being judged as when being.Like above-mentioned embodiment, when digit value greater than 160 the time, judge that coordinate is 32.
Step S1111:,, determine one first edge induction coordinate figure according to the ratio of pairing digit value of the first specific induction electrode and present count place value when the pairing digit value of the first specific induction electrode during less than the reference number place value.Can know that by the foregoing description because by the contact area that is pressed in the line of induction X01 when big more, the equivalent capacity of line of induction X01 can be big more, relative, obtaining digit value also can be big more.As long as therefore know, the pairing digit value of the first specific induction electrode, just can be according to the proportionate relationship of this digit value and above-mentioned present count place value (160), for example above-mentioned look-up table obtains first edge induction coordinate figure.In general, this proportionate relationship is based upon on the look-up table, builds the operational mathematics formula in certainly those skilled in the art can utilize or the mode of software is implemented.
Step S1112: with first edge induction coordinate figure divided by maximum induction coordinate figure after, be multiplied by first displaing coordinate number, obtain a calibration coordinate.
Step S1113: judge that whether the pairing digit value of the second specific induction electrode is greater than a reference number place value.When detecting when only having the one second specific induction electrode nearest to be touched, judge that earlier whether its corresponding digit value is greater than the reference number place value as a same reason from this second edge.
Step S1114:, judge that then the calibration coordinate is the pairing coordinate of the second specific induction electrode when being judged as when being.Like above-mentioned embodiment, when digit value greater than 160 the time, judge that coordinate is 736.
Step S1115: when the pairing digit value of the second specific induction electrode during less than the reference number place value; Ratio according to pairing digit value of the second specific induction electrode and present count place value; Determine one second edge induction coordinate figure; Wherein, this second edge induction coordinate figure drops between this maximum induction coordinate figure and the pairing induction coordinate figure of this first specific induction electrode.
Step S1116: with second edge induction coordinate figure divided by this maximum induction coordinate figure after, be multiplied by first displaing coordinate number, obtain calibrating coordinate.
One side of the present invention is the mode of inserting in utilizing; Come the coordinate between calibration capacitance formula sensor and the display panel not match on the other hand, because capacitance type sensor has a plurality of induction electrodes, each induction electrode all has a preset width; When only marginate induction electrode is touched; Utilize interpolation method just can only calculate the pairing coordinate of edge induction electrode, so possibly cause the edge of display panel to be touched, therefore; Another aspect of the present invention; Then be the pairing digit value of equivalent capacity of utilizing the induction electrode at edge to sense, judge the coordinate at edge, therefore also solved the unmatched problem of configuration with the coordinate of the configuration of the coordinate of capacitive touch control plate and display.
The specific embodiment that in the detailed description of preferred embodiment, is proposed is only in order to convenient explanation technology contents of the present invention; But not with narrow sense of the present invention be limited to the foregoing description; In the situation that does not exceed spirit of the present invention and above claim; The many variations of being done is implemented, and all belongs to scope of the present invention.So the claim person of defining that protection scope of the present invention is attached before looking is as the criterion.
Claims (1)
1. the coordinate calibration method of a touch control screen, described touch control screen comprises a display panel and a capacitance type sensor, it is characterized in that, the coordinate calibration method of said touch control screen comprises:
At first direction of principal axis, detect the capacitance change that a touching thing causes described capacitance type sensor;
Obtain the pairing three-dimensional of described capacitance change according to a look-up table;
Determine a conversion proportion in total number of coordinates of the described first axial theory and described display panel in the described first axial resolution according to described capacitance type sensor;
Described three-dimensional is multiplied by described conversion proportion, obtains the 4-coordinate of described touching thing corresponding to described display panel.
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| CN105511676A (en) * | 2015-12-11 | 2016-04-20 | Tcl移动通信科技（宁波）有限公司 | Touch screen coordinate transformation method and mobile terminal |
| CN105653915A (en) * | 2015-12-24 | 2016-06-08 | 深圳市万普拉斯科技有限公司 | Unlocking method and system for terminal with touch display screen |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101470561A (en) | 2009-07-01 |
| TWI401596B (en) | 2013-07-11 |
| TW200928933A (en) | 2009-07-01 |
| CN102331893B (en) | 2013-08-07 |
| CN101470561B (en) | 2011-11-23 |
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