CN101751172A - Touch position detecting method and touch screen - Google Patents
Touch position detecting method and touch screen Download PDFInfo
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- CN101751172A CN101751172A CN200810204447A CN200810204447A CN101751172A CN 101751172 A CN101751172 A CN 101751172A CN 200810204447 A CN200810204447 A CN 200810204447A CN 200810204447 A CN200810204447 A CN 200810204447A CN 101751172 A CN101751172 A CN 101751172A
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Abstract
The invention discloses a touch position detecting method and a touch screen. The detecting method comprises the following steps of: touching the touch screen, wherein the touch screen comprises a touch work layer provided with least two touch electrodes, and the electric current is generated between the touch electrode and the touch point by the touching; measuring the electric current flowing through the touch electrode; according to the electric current flowing through the touch electrode, determining the touch electrode closest to the touch point; and according to the electric current flowing through the touch electrode closest to the touch point and the position of the touch electrode, and the electric current flowing through the other touch electrode and the position of the other touch electrode, calculating the position of the touch point. The touch screen comprises a touch work layer on which at least two touch electrodes, an electric current detection module, a storage module, a comparison module and a calculation module are arranged. The invention improves the precision of detecting the touch position and reduces the cost.
Description
Technical field
The present invention relates to the touch recognition technical field, particularly touch position detecting method and touch-screen.
Background technology
At present, in the touch-screen field, the conventional surface capacitive touch screen compare traditional resistor formula touch-screen have the life-span long, transmittance is high, be applicable to advantage such as large scale display screen, therefore is widely used in the large scale product, and high-end product, for example in the product such as ATM, POS vending machine.
A kind of traditional capacitive touch screen as shown in Figure 1, this capacitive touch screen have 5 root interface lead-in wire: upper left line 82, upper right line 83, lower-left line 85, bottom right line 86 and shielding line 84.These 5 lead-in wires are received on the same sinusoidal ac potential source 81.Upper left line 82, upper right line 83, lower-left line 85, bottom right line 86 are received the upper left corner 98 of the touch-control working lining (generally adopting the conductive tin oxide phosphide material) 102 of touch-screen respectively, the upper right corner 99, and the lower left corner 100 is on the lower right corner 101.Shielding line 84 plays the effect of shielding external interference.And on the touch-control working lining, has non-conductive medium.The principle of work of this touch-screen is as follows: the non-conductive medium on the finger touch touch-control working lining, when human body grounding, point identical with the current potential on ground, therefore between the touch-control working lining of finger touch position and the finger just equivalence be the electric capacity 88 of a ground connection, therefore just form a turning circuit from AC power 81 to finger, thereby produced electric current.The electric current I 1 that produces, I2, I3, the resistance R 1 that I4 and touch point 87 are arrived between four angles of touch-screen, R2, R3, R4 is inversely proportional to.And these four resistance R 1, R2, R3, the value of R4 arrives the upper left corner 98 with touch point 87 again, the upper right corner 99, the lower left corner 100, the distance in the lower right corner 101 is directly proportional, therefore by the electric current I 1 of detection on four angles, I2, I3, I4 just can determine the touch location of pointing 87.
Therefore traditional capacitive touch screen is to utilize the ratio of the resistance between touch point and four angles of touch-control working lining to determine touch point position, so the computing method complexity, and cost is higher.
Secondly because when touch point distance when wherein some angles are far away, the electric current that flows through this angle is less, therefore utilizes this angle to determine that to the resistance of touch point the error of position, touch point is just bigger.
Summary of the invention
In order to overcome the above problems, the invention provides a kind of touch position detecting method and touch-screen, can be easy detect touch point position.
The invention provides a kind of touch position detecting method, comprise step:
Touch a touch-screen, described touch-screen comprises the touch-control working lining with at least two touch-control electrodes, and described touch makes between touch-control electrode and touch point and produces electric current;
The electric current of described touch-control electrode is flow through in measurement;
Determine the nearest touch-control electrode in the described touch point of distance according to the electric current that flows through described touch-control electrode;
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance and the position of this touch-control electrode, and the position of flowing through electric current He this touch-control electrode of another touch-control electrode, described touch point position calculated.
Optionally, described another touch-control electrode is: with the described touch-control electrode adjacent touch-control electrode nearest apart from the touch point.
Optionally, described another touch-control electrode is the near touch-control electrode in the described touch point of distance second.
Optionally, the method for the described touch point position of described calculating comprises:
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through described another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Utilize the described touch point of described first resistance calculations and, utilize the second distance between the described touch point of described second resistance calculations and described another touch-control electrode apart from first distance between the nearest touch-control electrode in touch point;
According to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of described another touch-control electrode, the position of described touch point on described touch-control working lining calculated.
Corresponding the present invention also provides a kind of touch-screen, comprising:
The touch-control working lining, described touch-control working lining is provided with at least two touch-control electrodes, on described touch-control electrode and the touch-control working lining arbitrarily some conduction link to each other;
Current detection module is used to detect the electric current that flows through described touch-control electrode;
Memory module, the positional information that is used to store the touch-control electrode;
Comparison module is used for determining the nearest touch-control electrode of the described touch point of distance according to the electric current that flows through described touch-control electrode;
Computing module is used for the positional information according to described touch-control electrode, the electric current that flows through the touch-control electrode nearest apart from the touch point and the electric current that flows through described another touch-control electrode, calculates described touch point position.
Optionally, described comparison module comprises determination module, be used for determining and the touch-control electrode adjacent touch-control electrode nearest apart from the touch point, and with this touch-control electrode as described another touch-control electrode.
Optionally, described comparison module comprises determination module, be used for determining the touch-control electrode near apart from touch point distance second according to the electric current that flows through the touch-control electrode, and with this touch-control electrode as described another touch-control electrode.
Optionally, described computing module comprises:
The resistance calculations module, be used for according to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Distance calculation module is used to utilize the described touch point of described first resistance calculations and apart from first distance between the nearest touch-control electrode in touch point, utilizes the second distance between the described touch point of described second resistance calculations and described another touch-control electrode;
Position computation module is used for according to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of the described touch point of the position calculation of described another touch-control electrode on described touch-control working lining.
Optionally, also comprise power module, be used for providing power supply to the touch-control working lining.
Optionally, also comprise gauge tap, be used to control the conducting of described power module and touch-control electrode.
Optionally, 16 touch-control electrodes that have the discharging of even interval on the side of described touch-control working lining.
The advantage of above-mentioned one of them technical scheme is: by on the touch-control working lining apart from nearest touch-control electrode in touch point and the distance between the touch point, and the position can calculate touch point position, computing method are easy, cost is low.
In another computing method, utilized two the touch-control electrodes nearest to calculate in addition apart from the touch point, so the degree of accuracy height.
In the technical scheme of touch-screen provided by the invention, utilize at least two touch-control electrodes are set in the touch-control working lining, and setting links to each other with the touch-control working lining in touch-screen current detection module, memory module, comparison module, computing module are determined the position of touch point on touch-screen, thereby utilize this touch-screen can determine the position of touch point on touch-screen accurately, reduced cost.
Description of drawings
Fig. 1 is the structural representation of traditional touch-screen;
Fig. 2 is the process flow diagram of touch position detecting method of the present invention;
Fig. 3 is the structural representation of the liquid crystal panel of touch-screen of the present invention;
Fig. 4 is the structural representation of the touch-control working lining of touch-screen of the present invention;
Fig. 5 is a touch position detecting method synoptic diagram of the present invention;
Fig. 6 is the structural representation of touch-screen of the present invention;
Fig. 7 is the liquid crystal panel structure synoptic diagram of touch-screen of the present invention;
Fig. 8 is the method for work synoptic diagram of touch-screen of the present invention.
Embodiment
In general, determine that the touch point all is to determine by the position of test touch point on the touch-control working lining usually in the position on the touch-screen, yet the touch point all is to determine by fixed position on the touch-control working lining and the distance between the touch point usually in the position on the touch-control working lining.For example be the electric current of measuring on four angles flowing through the touch-control working lining in the prior art, thereby obtain the proportionate relationship of the resistance between four angles and the touch point, because the distance between the resistance between four angles and the touch point and four angles and the touch point is inversely proportional to, thereby determine distance between four angles and the touch point by the resistance between four angles and the touch point, the final definite position of touch point on touch-screen, but this method calculation of complex, and because flowing through the electric current at the angle far away apart from the touch point exists than mistake, therefore the degree of accuracy of this method is lower.Yet in fact the resistivity of touch-control working lining is determined, therefore can utilize two point of fixity of touch-control working lining and the resistance between the touch point just can determine that two described point of fixity respectively and the distance between the touch point, just can determine the position of touch point on touch-screen in conjunction with the position of described point of fixity again.
Therefore the invention provides a kind of touch position detecting method, comprise step:
Touch a touch-screen, described touch-screen comprises the touch-control working lining with at least two touch-control electrodes, and described touch makes between touch-control electrode and touch point and produces electric current;
The electric current of described touch-control electrode is flow through in measurement;
Determine the nearest touch-control electrode in the described touch point of distance according to the electric current that flows through described touch-control electrode;
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance and the position of this touch-control electrode, and the position of flowing through electric current He this touch-control electrode of another touch-control electrode, described touch point position calculated.
Optionally, described another touch-control electrode is: with the described touch-control electrode adjacent touch-control electrode nearest apart from the touch point.
Optionally, described another touch-control electrode is the near touch-control electrode in the described touch point of distance second.
Optionally, the method for the described touch point position of described calculating comprises:
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through described another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Utilize the described touch point of described first resistance calculations and, utilize the second distance between the described touch point of described second resistance calculations and described another touch-control electrode apart from first distance between the nearest touch-control electrode in touch point;
According to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of described another touch-control electrode, the position of described touch point on described touch-control working lining calculated.
Corresponding the present invention also provides a kind of touch-screen, comprising:
The touch-control working lining, described touch-control working lining is provided with at least two touch-control electrodes, on described touch-control electrode and the touch-control working lining arbitrarily some conduction link to each other;
Current detection module is used to detect the electric current that flows through described touch-control electrode;
Memory module, the positional information that is used to store the touch-control electrode;
Comparison module is used for determining the nearest touch-control electrode of the described touch point of distance according to the electric current that flows through described touch-control electrode;
Computing module is used for the positional information according to described touch-control electrode, the electric current that flows through the touch-control electrode nearest apart from the touch point and the electric current that flows through described another touch-control electrode, calculates described touch point position.
Optionally, described comparison module comprises determination module, be used for determining and the touch-control electrode adjacent touch-control electrode nearest apart from the touch point, and with this touch-control electrode as described another touch-control electrode.
Optionally, described comparison module comprises determination module, be used for determining the touch-control electrode near apart from touch point distance second according to the electric current that flows through the touch-control electrode, and with this touch-control electrode as described another touch-control electrode.
Optionally, described computing module comprises:
The resistance calculations module, be used for according to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Distance calculation module is used to utilize the described touch point of described first resistance calculations and apart from first distance between the nearest touch-control electrode in touch point, utilizes the second distance between the described touch point of described second resistance calculations and described another touch-control electrode;
Position computation module is used for according to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of the described touch point of the position calculation of described another touch-control electrode on described touch-control working lining.
Optionally, also comprise power module, be used for providing power supply to the touch-control working lining.
Optionally, also comprise gauge tap, be used to control the conducting of described power module and touch-control electrode.
Optionally, 16 touch-control electrodes that have the discharging of even interval on the side of described touch-control working lining.
Embodiments of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 2 is the process flow diagram of touch position detecting method of the present invention, below in conjunction with Fig. 2 touch detecting method of the present invention is described.As shown in Figure 2, touch detecting method of the present invention comprises following step:
S110: touch a touch-screen, make between touch-control electrode and touch point and produce electric current, described touch-screen comprises the touch-control working lining with at least two touch-control electrodes.
Figure 3 shows that the structural representation of the liquid crystal panel of touch-screen; in the present embodiment; employed touch-screen has liquid crystal panel as shown in Figure 3, and this liquid crystal panel comprises and stacks gradually arrangement: back light unit 1, down polaroid 2, lower glass substrate 3, tft layer 4, pixel layer 5, liquid crystal 6, public electrode 7, colored filter 8, top glass substrate 9, touch-control screen layer 10, insulating medium layer 11, touch-control working lining 200, go up polaroid 13, protective seam 14.
Wherein, touch-control working lining 200 as shown in Figure 4,16 touch-control electrode 201-216 that have the discharging of even interval on the side of touch-control working lining 200 because touch-control working lining 200 is a conductive layer, are conductive interconnections a bit arbitrarily on described touch-control electrode 201-216 and the touch-control working lining 200 therefore.Wherein the material of touch-control electrode 201-216 is better than the electric conductivity of touch-control working lining 200, and particularly, touch-control electrode 201-216 is the silver metal material, and touch-control working lining 200 is a conductive tin oxide phosphide material layer.Because the material of touch-control electrode 201-216 is better than the electric conductivity of touch-control working lining 200, so touch-control electrode 201-216 has the effect of collected current, touch-control electrode 201-216 is set makes that the current value that flows to touch-control electrode 201-216 in the touch point is more accurate.
Touch-control electrode 201-216 is connected with AC power 119; because on touch-control working lining 200, have non-conductive medium; concrete as shown in Figure 3 on touch-control working lining 200, have polaroid 13 and a protective seam 14; therefore use the protective seam 14 of finger touch touch-screen; finger is identical with the current potential on ground when human body grounding; therefore between the touch-control working lining of finger touch position and the finger just equivalence be the electric capacity of a ground connection; so AC power 119; touch-control electrode 201-216; the position of finger touch point 110 correspondences on the touch-control working lining 200; finger; just form a turning circuit between the ground, thereby between the position of touch-control electrode 201-216 and touch-control working lining 200 finger touch points 110 correspondences, have electric current to flow through.Because touch-control working lining 200 has certain resistivity, so the position and the resistance between each touch-control electrode of finger touch point 110 correspondences is directly proportional with finger touch point 110 and each touch-control distance between electrodes on the touch-control working lining 200.That is to say that if touch point 110 is near more apart from certain touch-control electrode then the position and the resistance between this touch-control electrode of finger touch point 110 correspondences are more little on the touch-control working lining 200.Therefore and point the more little touch-control electrode of resistance between the position of touch point 110 correspondences on the touch-control working lining 200 again because the touch-control electrode all links to each other with same AC power,, it is big more to flow through its electric current.
S120: measure the electric current that flows through described touch-control electrode 201-216.
Specifically can be by between touch-control electrode 201-216 and AC power 119, connecting current detection module, the electric current of touch-control electrode 201-216 is flow through in test then, the electric current (I201) that for example flows through touch-control electrode 201 is 9A, the electric current (I201) that flows through touch-control electrode 202 is 10A, the electric current (I203) that flows through touch-control electrode 203 is 8A, the electric current (I204) that flows through touch-control electrode 204 is 7A, the electric current (I205) that flows through touch-control electrode 205 is 6A, the electric current (I206) that flows through touch-control electrode 206 is 5A, the electric current (I207) that flows through touch-control electrode 207 is 4A, the electric current (I208) that flows through touch-control electrode 208 is 2A, the electric current (I209) that flows through touch-control electrode 209 is 0.5A, the electric current (I210) that flows through touch-control electrode 210 is 2A, the electric current (I211) that flows through touch-control electrode 211 is 5A, the electric current (I212) that flows through touch-control electrode 212 is 7A, the electric current (I213) that flows through touch-control electrode 213 is 8A, the electric current (I213) that flows through touch-control electrode 214 is 9A, the electric current (I215) that flows through touch-control electrode 215 is 10A, and the electric current (I216) that flows through touch-control electrode 216 is 12A.
S130: determine the nearest touch-control electrode in the described touch point of distance according to the electric current that flows through described touch-control electrode 201-216.
Particularly, according to the electric current that flows through each touch-control electrode 201-216 that records, select the touch-control electrode of maximum current correspondence.Because touch-control working lining 200 has certain resistivity, therefore the position and the resistance between the touch-control electrode of finger touch point 110 correspondences are directly proportional with touch point 110 and touch-control distance between electrodes on the touch-control working lining 200, again because the touch-control electrode all links to each other with same AC power, therefore the more little touch-control electrode of resistance between the position of finger touch point 110 correspondences and on the touch-control working lining 200, it is big more to flow through its electric current, thereby the touch-control electrode that the flows through the electric current maximum as can be known nearest touch-control electrode that is exactly the described touch point of distance 110 for example is a touch-control electrode 216.
S140: according to the electric current that flows through the nearest touch-control electrode in the described touch point of distance and the position of this touch-control electrode, and the position of flowing through electric current He this touch-control electrode of another touch-control electrode, calculate described touch point position.
In the present embodiment, described another touch-control electrode is and the described touch-control electrode adjacent touch-control electrode nearest apart from the touch point.Therefore according to the position of the touch-control electrode 216 of maximum current correspondence, thereby can know that its adjacent touch-control electrode is touch-control electrode 215 and touch-control electrode 201, can be from wherein selecting one arbitrarily, because the electric current that flows through touch-control electrode 215 is greater than the electric current that flows through touch-control electrode 201, so concrete in the present embodiment calculating as another touch-control electrode with touch-control electrode 215.
In addition, described another touch-control electrode can also be the near touch-control electrode in the described touch point of distance second.Specifically can select the touch-control electrode of second largest electric current correspondence in touch-control electrode 201-216, for example be touch-control electrode 215 in the present embodiment.
Calculate the position of described touch point 110 then, concrete grammar comprises step:
According to the electric current that flows through touch-control electrode 216, and the electric current that flows through touch-control electrode 215, calculate first resistance between described touch point 110 and the touch-control electrode 216, and second resistance between described touch point 110 and the touch-control electrode 215.
Utilize then between described touch point 110 and the touch-control electrode 216 the described touch point 110 of first resistance calculations and apart from first distance between the nearest touch-control electrode 216 in touch point 110, and utilize the second resistance calculations touch point 110 between described touch point 110 and the touch-control electrode 215 and the second distance between another touch-control electrode 215.Specifically can adopt first resistance that utilizes earlier the electric current that flows through touch-control electrode 216 and supply voltage to calculate to point on touch-control electrode 216 and the touch-control working lining 200 between the corresponding position, touch point 110; And then utilize on touch-control electrode 216 and the touch-control working lining 200 first resistance between the position of finger touch point 110 correspondences, and the resistrivity meter of touch-control working lining 200 is calculated first distance between touch point 110 and the touch-control electrode 216.For example the resistivity of touch-control working lining 200 is 0.2 Ω/cm, supply voltage is 6V, the electric current that flows through touch-control electrode 216 is 12A, then the position and first resistance between the touch-control electrode 216 of finger touch point 110 correspondences are 6V ÷ 12A=0.5 Ω on the touch-control working lining 200, between touch point 110 and the touch-control electrode 216 first distance is: 0.5 Ω ÷, 0.2 Ω/cm=2.5cm, can calculate the touch point with quadrat method is 6V ÷ 10A ÷ 0.2 Ω/cm=3cm apart from the second distance of touch-control electrode 215.
According to the position of the nearest touch-control electrode 216 in distance touch point 110, and the position of position calculation touch point 110 on touch-control working lining 200 of another touch-control electrode 215.Because touch-control electrode 216 and the position of touch-control electrode 215 on touch-control working lining 200 are determined, for example as shown in Figure 5, two crossing sides with touch-control working lining 200 are coordinate axis, then the coordinate of touch-control electrode 216 is (0,4), the coordinate of touch-control electrode 215 is (0,0), with touch-control electrode 216 is that center of circle 2.5cm is that radius has a circle, touch-control electrode 215 is that radius also has a circle for center of circle 3cm, then touch point 110 is positioned at the intersection point of these two circles at touch-control working lining 200, therefore can find the solution the position coordinates that draws touch point 110 by two equation of a circles.
Present embodiment is by finding the touch-control electrode nearest apart from the position, touch point, thereby improved the degree of accuracy of calculating, and in addition because utilize two touch-control electrodes through calculating the position that just can all obtain touch point, so calculates easyly, and cost is low.
Figure 6 shows that the structural representation of touch-screen of the present invention.Below in conjunction with Fig. 6 touch-screen of the present invention is described.As shown in Figure 6, in the present embodiment, touch-screen comprises liquid crystal panel and control module.
Wherein liquid crystal panel comprises as shown in Figure 4 and to stack gradually arrangement:
Back light unit 1, time polaroid 2, lower glass substrate 3, tft layer 4, pixel layer 5, liquid crystal 6, public electrode 7, colored filter 8, top glass substrate 9, touch-control screen layer 10, insulating medium layer 11, touch-control working lining 200, last polaroid 13, protective seam 14.In the present embodiment, touch-control working lining 200 is provided with at least two touch-control electrodes, on described touch-control electrode and the touch-control working lining 200 arbitrarily some conduction link to each other, concrete have 16 touch-control electrode 201-216 that discharge at even interval on the side of described touch-control working lining 200.This liquid crystal panel is compared with the liquid crystal panel structure of conventional condenser touch-screen and has been saved protective seam 14 outer field one deck glass substrates, therefore touch screen function is integrated in the liquid crystal panel, thus simple in structure, increased transmittance, reduced cost.
Wherein control module comprises: current detection module 120, memory module 130, comparison module 140, computing module 150.
Computing module 150, link to each other with memory module 130, comparison module 140 and current detection module 120, be used for the positional information according to memory module 130 outputs, the nearest touch-control electrode of the described touch point of distance of comparison module 140 outputs, and the electric current that flows through the touch-control electrode of current detection module 120 outputs, calculate described touch point position.
Concrete at present embodiment, comparison module 140 also comprises determination module 145, is used for determining and the described touch-control electrode adjacent touch-control electrode nearest apart from the touch point.In addition, determination module 145 can also be used for determining that according to the electric current that flows through described touch-control electrode the described touch point of distance is apart from the second near touch-control electrode.
Concrete at present embodiment, described computing module 150 comprises:
In the present embodiment, control module also comprises power module (not shown), and power module links to each other with the touch-control electrode, is used for providing power supply to touch-control working lining 200.
In the present embodiment, touch-screen of the present invention also comprises controller 180, and described control module is arranged in the controller 180, and touch-control electrode 201-216 links to each other with controller 180 by flexible printed circuit board (FPC) 113.In controller 180, also comprise gauge tap 115, by the conducting of gauge tap 115 control power modules and touch-control electrode, and the conducting of gauge tap 115 control touch-control electrodes and current detection module 120.
In the present embodiment, controller 180 is arranged in the chip, and is installed in the periphery of the touch-control working lining 200 of liquid crystal panel.
Figure 7 shows that the liquid crystal panel structure synoptic diagram of touch-screen of the present invention.Below in conjunction with Fig. 7 the touch-screen of another embodiment of the present invention is described.
In the present embodiment with the embodiment of touch-screen shown in Figure 6 in identical part repeat no more, difference is, in the present embodiment, the liquid crystal panel of touch-screen comprises as shown in Figure 7 and stacks gradually arrangement:
Back light unit 1, time polaroid 2, lower glass substrate 3, tft layer 4, pixel layer 5, liquid crystal 6, public electrode 27, colored filter 8, top glass substrate 9, touch-control screen layer 10, insulating medium layer 11, touch-control working lining 200, last polaroid 13, protective seam 14.
The liquid crystal panel of this touch-screen has removed screen layer, makes the top glass substrate work simplification, has reduced two-layer hyaline layer and has increased transmittance.But, liquid crystal display (LCD) noise has been increased to the influence of touch-screen owing to removed screen layer.In order to reduce of the influence of LCD noise to touch-screen, can adopt in the following method, as shown in Figure 8, because LCD is mainly derived from LCD public electrode 27 to the noise of touch-screen, and the voltage signal of public electrode 27 is a kind of square waves 61.Because a bigger coupling capacitance is arranged between LCD public electrode 27 and the touch-screen working lining 200, so the signal 61 of LCD public electrode 27 also can pass on the touch-screen working lining 200, and the voltage waveform 62 that conduction is come as shown in Figure 8.Because the effect of electric capacity, the noise that this conduction is come is bigger when LCD common electrode signal 61 changes, can decay afterwards.Therefore if touch-screen detects sequential 63 and 64 do not detect touching signals when the LCD noise is big, and hours 65 detect touching signals at the LCD noise, the LCD The noise will reduce greatly like this.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (11)
1. a touch position detecting method is characterized in that, comprises step:
Touch a touch-screen, described touch-screen comprises the touch-control working lining with at least two touch-control electrodes, and described touch makes between touch-control electrode and touch point and produces electric current;
The electric current of described touch-control electrode is flow through in measurement;
Determine the nearest touch-control electrode in the described touch point of distance according to the electric current that flows through described touch-control electrode;
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance and the position of this touch-control electrode, and the position of flowing through electric current He this touch-control electrode of another touch-control electrode, described touch point position calculated.
2. touch position detecting method according to claim 1 is characterized in that, described another touch-control electrode is: with the described touch-control electrode adjacent touch-control electrode nearest apart from the touch point.
3. touch position detecting method according to claim 1 is characterized in that, described another touch-control electrode is the near touch-control electrode in the described touch point of distance second.
4. touch position detecting method according to claim 1 is characterized in that, the method for the described touch point position of described calculating comprises:
According to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through described another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Utilize the described touch point of described first resistance calculations and, utilize the second distance between the described touch point of described second resistance calculations and described another touch-control electrode apart from first distance between the nearest touch-control electrode in touch point;
According to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of described another touch-control electrode, the position of described touch point on described touch-control working lining calculated.
5. a touch-screen is characterized in that, comprising:
The touch-control working lining, described touch-control working lining is provided with at least two touch-control electrodes, on described touch-control electrode and the touch-control working lining arbitrarily some conduction link to each other;
Current detection module is used to detect the electric current that flows through described touch-control electrode;
Memory module, the positional information that is used to store the touch-control electrode;
Comparison module is used for determining the nearest touch-control electrode of the described touch point of distance according to the electric current that flows through described touch-control electrode;
Computing module is used for the positional information according to described touch-control electrode, the electric current that flows through the touch-control electrode nearest apart from the touch point and the electric current that flows through described another touch-control electrode, calculates described touch point position.
6. touch-screen according to claim 5 is characterized in that described comparison module comprises determination module, be used for determining and the touch-control electrode adjacent touch-control electrode nearest apart from the touch point, and with this touch-control electrode as described another touch-control electrode.
7. touch-screen according to claim 5, it is characterized in that, described comparison module comprises determination module, be used for determining the touch-control electrode near apart from touch point distance second according to the electric current that flows through the touch-control electrode, and with this touch-control electrode as described another touch-control electrode.
8. touch-screen according to claim 5 is characterized in that, described computing module comprises:
The resistance calculations module, be used for according to the electric current that flows through the nearest touch-control electrode in the described touch point of distance, and the electric current that flows through another touch-control electrode, calculate described touch point and apart from first resistance between the nearest touch-control electrode in touch point, and second resistance between described touch point and described another touch-control electrode;
Distance calculation module is used to utilize the described touch point of described first resistance calculations and apart from first distance between the nearest touch-control electrode in touch point, utilizes the second distance between the described touch point of described second resistance calculations and described another touch-control electrode;
Position computation module is used for according to described first distance and described second distance, and the position of the touch-control electrode nearest apart from the touch point, and the position of the described touch point of the position calculation of described another touch-control electrode on described touch-control working lining.
9. touch-screen according to claim 5 is characterized in that, also comprises power module, is used for providing power supply to the touch-control working lining.
10. touch-screen according to claim 5 is characterized in that, also comprises gauge tap, is used to control the conducting of described power module and touch-control electrode.
11. touch-screen according to claim 5 is characterized in that,
16 touch-control electrodes that have the discharging of even interval on the side of described touch-control working lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810204447A CN101751172A (en) | 2008-12-08 | 2008-12-08 | Touch position detecting method and touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810204447A CN101751172A (en) | 2008-12-08 | 2008-12-08 | Touch position detecting method and touch screen |
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| Publication Number | Publication Date |
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| CN101751172A true CN101751172A (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810204447A Pending CN101751172A (en) | 2008-12-08 | 2008-12-08 | Touch position detecting method and touch screen |
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| CN (1) | CN101751172A (en) |
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Application publication date: 20100623 |