TW200949658A - Device for detecting touch-points on a touch screen and the method thereof - Google Patents

Abstract

This invention discloses a device for detecting touch-points on a touch screen. It comprises a conductive layer panel and a wiring selection switch. Wherein, the conductive layer panel includes a first conductive layer panel and a second conductive layer panel; further, each conductive layer panel has a positive connection terminal and a negative connection terminal. The wiring selection switch is used to connect one of the two positive connection terminals to a positive reference voltage and connect one of the two negative connection terminals to a negative reference voltage; a detecting signal terminal is selected by choosing one of the remaining two connection terminals except the original two connection terminals connected to the positive and negative reference voltages among the four terminals of the conductive layer panel. Therefore, a set of voltage value for one of the four connection terminals can be detected by the selection of the wiring selection switch to then perform detection for judgment based on the single set of voltage value. As a result, this invention can support a single touch-point detection and multiple touch-point detection as well.

Description

200949658 IX. Description of the Invention: • Technical Field of the Invention The present invention relates to the field of electronic technology, and more particularly to a touch screen detecting apparatus and method. [Prior Art] Touch screen technology is a main input method for human-computer interaction in the future. It will gradually eliminate keyboard and mouse input tools, and multitouch technology is a more attractive highlight in this field. However, most of this technology uses the optical principle to detect the touch screen, and the cost is too high, which is unacceptable to most users at present. The traditional 4-wire resistive touch screen includes two conductive layer panels of X and γ. The mode of use is as shown in Fig. 1. Each touch point divides the X conductive layer panel and the Y conductive layer panel into two parts, among which Ri and R3 represents the equivalent resistance of the two portions into which the X conductive layer is divided, and R4 and R6 represent the equivalent resistances of the two portions into which the γ-parameter conductive layer is divided. Since each conductive layer panel has a linear resistivity, that is, the length of a portion of the panel is proportional to the resistance of the portion of the panel, only the resistance of R1 or R3 and the resistance value of R4 or R6 are required to obtain Touch the point of the Xposition of the conductive layer and the Yp〇siti〇n of the γ conductive layer. Generally, the value of the resistance phantom and the R6 filial Rz can be obtained by four or three measurements, wherein ^z represents the resistance value due to the touch. [Q 5 refers to Figure 1, the four measurements are as follows: Measurement 1. XP is connected to positive voltage Vref+, χη is connected to negative voltage Vref_, γρ 5 200949658 • and Υη floating Υ Measure Υρ voltage value V3, then Available • R3=V3/4096*Rxplate, where κχρ^ is the total electrical resistance of the X conductive layer and 4096 is the measurement level of the analog digital (AD) converter with 12 bit accuracy. If the precision is lObit, you can distinguish between 1 and 24 levels. Measurement 2. Same as measurement. 接 ρρ positive voltage Vref+, γη is connected to negative voltage Vref- Χ Χρ and Χη floating, and measuring 电压ρ voltage value V1, then ‘where 'R' plate is the total resistance of the ¥ conductive layer. Boxing measurement III, YP is connected to Vref+, Xn is connected to Vref·, Xp and Υη are floating, and the voltage value V5 of Χρ is measured. The measurement IV, Υρ is connected to Vref+, Χη is connected to Vref_, Χρ and Υη are floating, and the voltage value V6 of Υη is measured. Then you can get ^2=foot 3*(\^6/¥5-1). The three measurement methods are as follows: Measurement one, Χρ is connected to Vref+' χη to Vref_, Yp and Υη are floating, and the voltage value V3 of Υρ is measured, then R3=v3/4096*Rxplate is obtained. Measurement 1. For the same reason, Υρ is connected to Vref+, Υη is connected to Vref_, Χρ and Χη floating, and the voltage value VI of χΡ is measured, then R6=Vl/4096*Ryplate can be obtained. Measurement three, Υρ connected to Vref+, χη connected to Vref_, Xp and Υη floating, measuring the voltage value V5 of Χρ, then you can get !^=^3*(4〇96/¥5-1)-114. That is to say, 'the conventional 4-wire resistive touch screen system applies a certain voltage to the electrode pair in the χ direction (X conductive layer), and when no voltage is applied to the γ direction (Υ conductive layer) electrode pair, In the parallel voltage field, the voltage at the contact can be reflected on the Υρ electrode. By measuring the voltage of the Υρ electrode to ground, the X coordinate Xposition of the contact can be known. Similarly, when a certain voltage is applied to the pair of electrodes in the Ύ direction, 6 200949658 and no voltage is applied to the pair of electrodes in the x direction, by measuring the voltage of the Χ ρ electrode, the γ coordinate Yp 〇 siti 触点 of the contact can be known. n. That is, due to the conductive layer and the conductive layer, the electrical layer (4) is noisy and distributed. However, the prior art only supports the detection of a single-point touch on a 4-wire resistive touch screen; the _| can not detect the multi-touch of the 4-wire resistive touch screen. © SUMMARY OF THE INVENTION One object of the present invention is to provide a touch screen detecting device that can support multiple touch point detections on a resistive touch screen. Another object of the present invention is to provide a touch screen detection method that can support multiple touch point detections on a resistive touch screen. In order to achieve the above object, according to an aspect of the present invention, a touch panel detecting device of the present invention includes: a conductive layer panel including a first conductive layer panel and a second conductive layer panel, wherein each conductive layer The panel has a positive connection end and a negative connection end; the wiring gate is configured to connect one of the two positive connection terminals to the positive reference voltage, and one of the two negative connection ends is connected to the negative reference voltage One of the four connection ends of the conductive layer panel except the two connection ends that are connected to the positive and negative reference voltages is gated as the detection signal terminal. Further, the wiring gate comprises a positive reference voltage strobe: a detection signal strobe unit, a negative reference strobe unit, and a strobe unit, wherein the control of the positive reference voltage county unit cryptosystem will be 7 200949658 The two positive poles are connected to the front of the towel—(4) is connected to the positive reference voltage, _===== (10) control will be used to control the gate unit in accordance with the control of the gate control unit. The strobe is the detection signal end, and the strobe control unit has six control modes, the spring pass single::: 忿 元 控制 control positive reference voltage gating unit strobe: the connection end, the negative reference exhaust unit Signal strobe pass single handle, Saki noodles control element butterfly is positive reference to the electric surface end, test _ Cui Yuan election difficult number selection pass single element control positive reference electric plane guide f level (four) j £ pole connection end, 贞 通通第: 8 200949658, the negative terminal of the unit-conducting layer of the conductive layer and the detection signal strobe the positive terminal of the first conductive layer panel. In the sixth mode, the gating control unit controls the positive reference terminal of the positive reference voltage gating single strobe second conductive layer panel, the negative reference voltage gating cell strobes the negative terminal of the first conductive layer panel, and The detection signal gating unit gates the negative terminal of the second conductive layer panel. Φ 10 According to the present invention, the present invention provides a measuring method, which includes a first conductive layer panel and a second conductive material 2, each of which has a positive electrode connection terminal and a negative electrode connection terminal. : connecting the positive terminal of the second conductive wide panel to the positive reference voltage, connecting the drain connection end of the second conductive layer panel to the reference voltage, and detecting the voltage value of the positive terminal of the first conductive layer panel vi; The positive electrode connection end of the conductive layer panel is connected with a positive reference voltage, the negative electrode connection end of the second conductive layer is connected to a negative reference voltage, and the voltage value V2 of the negative electrode connection end of the first conductive layer is detected; the positive electrode of the first conductive layer panel is connected Connect the positive reference voltage to the terminal, connect the drain connection of the first conductive layer to the negative reference voltage, and detect the electrical waste value y3 of the positive terminal of the second conductive layer panel. Connect the positive terminal of the first conductive layer to the positive reference. Voltage, connecting the negative connection end of the first conductive layer panel to the negative reference voltage, detecting the voltage value V4 of the negative connection end of the second conductive layer panel; and positively controlling the second conductive layer panel The connection end is connected with a positive reference voltage, the connection end of the first conductive layer panel is connected to the negative reference voltage, and the positive electrode connection of the first conductive layer panel is detected as the voltage value V5; and the positive connection end of the second conductive layer panel is connected Voltage, connect the negative terminal of the first conductive layer panel to the negative reference voltage 9 200949658 Pressure 'detects the voltage value V6 of the negative terminal of the second conductive layer panel. Further, the method further includes: determining the number of the touch points and the distribution information based on the detected voltage values. Further, the determining the number of touch points and the distribution information according to the detected voltage values includes: calculating a difference between the voltage V and the voltage V2, a difference between V1 and V2, and a difference between the voltage V3 and the voltage V4. V3-V4; compare the difference value V1_V2 and the difference V3-V4 with the first and second thresholds THD1, THD2 parameters 'where THD1 is less than or equal to 〇, THD2 is greater than or equal to 0; at THD1=V1-V2=THD2 and THD1 When =V3_V4=THD2, it is determined that there are a single touch point on the touch screen or two touch points having the same X coordinate or y coordinate; when V1-V2&lt;THD1 and V3-V4&lt;THD1, it is determined that the coordinate on the touch screen satisfies xl&gt;x2 Two touch points of yl &lt;y2; at V1-V2&gt;THD2 and V3-V4&gt;THD2, 'determine that the touch screen has two touch points whose coordinates satisfy xl&gt; x2, yl &gt; y2. Further, after determining that the touch screen has a single touch point or two touch points having the same X coordinate or y coordinate when THD1=V1-V2=THD2 and ®THD1=V3_V4=THD2, the method further includes: passing voltage V5, V6 calculate a first calculated value Rzl of the touch resistance of the touched point and a first negative value Rz2; obtain a difference delta' of the first calculated value and the second calculated value Rz2 and the delta with the third and fourth critical The values THD3 and THD4 are compared 'where THD3 is less than or equal to 〇, THD4 is greater than or equal to 〇; at THD3'deltaSTHD4, it is determined that there is one touch point on the touch screen; when delta>THD4', it is determined that two touch points having the same X coordinate on the touch screen are determined; At THD3&gt;delta, two 200949658 touch points having the same y coordinate on the touch screen are determined. Current =:=: According to the detected electrical values, compared with the prior art, in the technical solution of the present invention, the conductive material layer - the positive electrode connection end and the positive electrode connection end and the negative electrode connection end of the 贞 Φ plate By connecting different ways, it is possible to detect that a certain pressure value on one of the four connection terminals can be detected according to the -group voltage value, and == the invention can not only discriminate the single defect detection, The invention also provides a touch screen detecting device capable of detecting multiple touch point detections on a resistive touch screen. As shown in FIG. 5, it is a schematic structural diagram of a touch screen detecting apparatus according to an embodiment of the present invention. The multi-touch point detecting apparatus includes a conductive layer panel 220, a wiring gate 240, an analog digital converter (ADC) 260, and Processor 280. The conductive layer panel 220 includes an X conductive layer panel and a γ conductive layer panel, which may also be referred to as a first conductive layer panel and a second conductive layer panel, wherein the X conductive layer panel has a positive electrode connection end χρ and a negative electrode connection end shape. The conductive layer panel has a positive terminal and a negative terminal. Both conductive layer panels are attached to the actual display to form the actual touch screen. In this embodiment, Xplate or Rxplate is used to indicate the total resistance of the X conductive layer panel in the X-axis direction of the actual display screen. The total resistance can be tested by straight 11 200949658, generally about 3 (8) ;; with Yplate or Kiss - The total resistance of the Y conductive layer panel in the y-axis direction of the actual display screen. The total resistance can also be directly tested, usually about 7〇〇〇. P1 and P2 respectively represent the linear resistivity of the X conductive layer panel in the χ direction of the actual display screen and the Υ conductive layer panel in the y direction of the actual display screen, and the accuracy of the analog digital converter is assumed to be (meaning that 面板In the direction, the X conductive layer panel can be divided into 2n parts, and the Y conductive layer panel can be divided into 2n parts in the y direction, then pl=Xplate/2N, P2_Yplate/2N. Thus, the corresponding resistance value of the χ conductive layer panel of the χ length in the χ direction is Rx=Pl: «cXpGsitiGn, XpQsiti(10) represents the relative distance 'Xp〇siti〇ne [0 ' 2N-1]; similarly, in the y direction The corresponding resistance value of the Y conductive layer panel of the upper y length is Ry=P1*Yp〇siti〇n, and Yp〇siti〇n represents the relative distance, Yp〇siti〇nef〇, 2N_lj. When there are two touch points on the touch screen and the coordinates satisfy <?^, y2&lt;yl, the circuit equivalent diagram of the touch screen in the present invention is as shown in FIG. 2A; there are two touch points on the touch screen at the same time. When the coordinates satisfy χ2&lt;χΐ, y2&gt; yl, the circuit equivalent diagram of the touch screen in the present invention is as shown in the 2β figure; when there are two touch points on the touch screen and the coordinates χ2_χΐ, y2=yi, the present invention The circuit equivalent diagram of the touch screen is shown in FIG. 3A; when there are two touch points on the touch screen and the coordinates X2=xl, y2=^yl, the circuit equivalent diagram of the touch screen of the invention towel is as shown in FIG. . Referring to FIG. 2A and FIG. 2B , each conductive layer panel of the touch screen is represented by the two two parts, and the electrical age of each part is represented by magic, R2, R3, R4, R5, and R6. In addition, (4) and (4) respectively indicate the touch resistance of two 12 200949658 touch points. Please refer to Figure 3A and Figure 4A. When the two touches • point x coordinates are the same, the resistances = 〇. When the two touch points y are the same, the resistance R5 = 所示 is shown. When there is only one touch point on the touch screen, an equivalent schematic diagram of the touch screen in the present invention is as shown in Fig. 1. Each of the conductive layer panels of the touch screen is generally divided into two parts by the touch point. The wiring gate 240 is configured to connect a strobe of the connection terminal χρ and the connection terminal γρ to a positive reference voltage, and connect the connection terminal XN and a strobe of the connection terminal yn to a negative reference voltage, and connect the connection terminal One of the two of the XP, the connection terminal XN, the connection terminal YP, and the connection terminal YN except the aforementioned gate is gated as the detection signal terminal. The wiring gate 240 includes a positive reference voltage strobe early 242, a strobe strobe early 244, a negative reference voltage strobe unit 246, and a strobe control unit 248. The positive reference voltage gating unit 242 is configured to connect one of the connection terminal χρ and the connection terminal γρ to the positive reference voltage according to the control of the gating control unit 248, and the negative reference voltage gating unit 246 is configured to be used according to the gating control unit. The control of the 248 connects the connection terminal and the strobe of the connection terminal 接 to the negative reference voltage, and the detection signal strobe unit 244 is configured to connect the connection terminal χρ and the connection terminal according to the control of the strobe control unit 248. One of the strobes and the strobe terminal is the detection signal terminal. As shown in Fig. 6, the gate control unit 248 has six control modes at the time of multi-touch point detection. Referring to the reference figure, the second diagram, the third diagram, and the fourth diagram, in the first mode, the gate control unit 248 controls the positive reference voltage gating unit 242 to gate γρ, the negative reference voltage gating unit 246. The strobe 检测 and the detection signal strobe unit 244 are strobed, and the connection terminal ΧΝ is floated. At this time, the wiring strobe 24 输出 outputs the voltage V1 at the connection terminal 13 ρ 13 200949658 to the analog digital converter 26 〇. In the second mode, the gate control unit 248 controls the positive reference voltage gating unit 242 to gate YP, the negative reference voltage gating unit 246 to gate YN, and the detection signal gating unit 244 to strobe xn, and the connection terminal 浮ρ float Empty 'At this time, the wiring strobe 24 输出 outputs the electric waste V2 on the connection terminal XN to the analog digital converter 26 〇. In the third mode, the gate control unit 248 controls the positive reference voltage gating unit 242 strobe XP, the negative reference voltage strobe unit 246 strobes the XN, and the detection strobe unit 244 strobes the YP, the connection terminal YN Floating, at this time, the wiring gate 240 outputs the voltage V3 at the connection terminal γρ to the analog digital converter 260. In the fourth mode, the gate control unit 2 controls the positive reference voltage gating unit 242 to strobe XP, the negative reference voltage gating unit 246 to strobe XN, and the detection signal strobe unit 244 to stro yn, the connection terminal γρ Floating, at this time, the wiring strobe 24 输出 outputs the voltage V4 at the connection terminal to the analog digital converter (10). In the fifth mode, the gate control unit 248 controls the positive reference voltage strobe S 242 gate up, the negative reference voltage strobe unit 246 strobe XN and the detection signal strobe unit 244 strobe ρ, the connection terminal % Floating, at this time, the wiring strobe 240 outputs the voltage V5 at the connection terminal χρ to the analog digital converter 260. In the sixth mode, the Wei control unit 248 controls the positive reference voltage gating unit 242 to gate γρ, the negative reference voltage gating unit 246 strobe ΧΝ, and the detection signal gating unit 244 to strobe, and the connection terminal XP is floating. At this time, the wiring strobe 240 outputs the voltage V6 at the connection terminal to the analog digital converter 260. The gating control unit 248 can arbitrarily arrange the six modes for controlling each gating unit in the case of the _ touch point. 'According to the prior art, it is only necessary to perform the first port requirement 200949658 Z one type or the second type The four modes can be used to find the position of the touch point. If the touch point pressure test is still needed, the fifth mode five: mode needs to be added. When you have two touch points, you must execute ~, Miscellaneous. Thus, the secondary screen device of the present invention can support not only defect detection but also single-point detection. Since the wiring of the wiring strobe n(10) is equal to the analog signal, the analogy is difficult to turn 26G out of the wiring gate (10) output analogy of the money surface _Wei pressure shop digital signal voltage value. In the &amp; implementation, the analog voltage (four) detection function is logically assigned to the analog-to-digital converter 260. In the process of implementation, the fine-grained group that realizes the voltage value can interact with the module that implements the analog-to-digital conversion function. independent. If the accuracy of the dip converter is 丨, then in the X direction, the χ conductive layer panel can be divided into 212=槪, and in the Υ direction, the conductive layer can be transferred to the conductive layer 2l2=4G96. For the convenience of calculation, the difference between the positive and negative reference voltages is set to 4096 in this specification. Typically, the ground is used as a negative reference voltage. Assuming that the coordinates of the two touch points are (xl, yl), (x2, y2) and xl > x2, the physical meaning of the voltage values at different ends of the two conductive layers of the touch screen is analyzed below (the magnitude of the voltage value, the position of the touch point) Direct correlation): 1. The difference between VI and V2 and the difference between V3 and V4 are both +〇 (close to 〇)', indicating that the touch point on the touch screen is a single point, two touch points with the same X coordinate or y coordinates. The same two touch points; 1. If (V1 &gt; V2) &amp;&amp; (V3 &gt; V4) ', then yl &gt; y2, the equivalent schematic diagram of the two conductive layer panels with two touch points is shown in Figure 2A 15 200949658 shown. 2. If (V1&lt;V2) &amp;&amp;(V3&lt;V4) is satisfied, then yl&lt;y2 ’

An equivalent schematic of two conductive layer panels with two touch points at this point is shown in Figure 2B. After the analog digital converter (ADC) 260 delivers four voltage values V1-V4 to the processor 280, the processor 280 needs to determine whether it is the first case, the second case, or the above according to the values of V1-V4. In the third case, the participation takes different follow-up treatments according to different results. In a preferred embodiment, the first and second thresholds THm and THD2 are also set for VI, V2, V3, and V4, wherein ΤΗ〇1 is less than or equal to 〇, and THD2 is greater than or equal to 〇, and the absolute values of the two thresholds may be equal. Then, in the case of THD1 V1-V2STHD2 and THD1 $V3-V4STHD2, the touch points on the touch screen are single point, two touch points with the same X coordinate, or two touch points with different temples. In Vi_v2 &gt; THD2 and V3-V4 &gt; THD2, it is judged that the touch screen has two touch points and the coordinates satisfy xl &gt; x2, yl &gt; y2. At THD1 &gt; V1-V2 and THD1 &gt; V3-V4, it is determined that the touch screen has two touch points and the coordinates satisfy xl &gt; x2, yl &lt; y2. b. In the first case, the processor 28 in the present invention also needs to determine whether the K single contact or the two sugar dots. In the following, the following is an embodiment of the present invention. How does the frequency-of-frequency determination be one-touch or two touch points? Analogous digital age measurement of single-sided touch coordinates, can also measure the pressure of single touch, see Figure 1, by adding forward voltage on the Υρ and Χη electrodes, measuring the voltage values of Χρ and Υη are V5 and V6 respectively , by formula (1): 16 200949658

Rz=(Rxplate)*(Xp〇sition/4096)*( V6/ V5-1) or formula (2):

Rz=(Rxplate*Xp〇sition/4096)*(4096/V5-l)-Ryplate* (l-Yposition/4096) Using the relationship between the touch resistance Rz and the touch pressure, the pressure at the touch point can be obtained. The relative value, that is, the value of the resistance Rz is used to characterize the pressure value of the touch point. Where Rz represents the resistance value due to the touch; Rxpiate is the total resistance of the x conductive layer; Ryplate is the total resistance of the Y conductive layer; 4096 represents the measurement level of the analog digitizer (AD) converter with 12 bits accuracy; Xposition is the contact The X coordinate value; Yposition is the gamma coordinate value of the contact. The derivation principle of equation (1) is as follows: · From Yp via R4, Rz, R3 to χη, the current is everywhere, and the voltage ratio is equal to the resistance ratio. It is known that V6/V5=(Rz+R3)/R3 ’

Rz—RS* ( V6/V5-1) ' where R3=(Rxplate&gt;*(Xposition/4096J, thus obtaining the formula (1). The derivation principle of the formula (2) is as follows: From Yp via R4, Rz, R3 to Xn 'current is equal everywhere, the voltage ratio is equal to the resistance ratio. It can be seen that (4096-V5) /V5= ( R4+Rz ) /R3, and the solution is Rz= ( 4096/V5-1) *R3-R4, where R^RxplatefpCposition ^O%), R4= Ryplate* (l-Yposition/4096) ' thus obtaining the formula (2) β The embodiment of the invention is based on this pressure measurement method, through different calculation formulas (1) and (2) Find the contact resistance value, and then calculate the difference between the two calculated values of the contact resistance calculated by the two formulas. 17 200949658 delta=Formula (1)-Formula (2) =Ryplate* (l-Yposition/4096) • - (Rxplate*Xp〇sition/4096)*(4096-V6y γ5 The following is a detailed analysis of the meaning of delta. If this is a single touch point, because both formulas are used to find the same physical quantity, the delta value should obviously Nearly 〇. '# fruit is two touch points on the X axis, that is, 0 touch points with the same y coordinate, then the equivalent circuit of the touch screen at this time As shown in FIG. 3A, when

Yp is connected to Vref+ 'Xn is connected to Vref-' and is connected in parallel with (4): Then this whole is connected in series with R4 and R3 in the circuit. χρ voltage% and Yn voltage V6 are measured. Obviously, formula (1) or formula cannot be directly used. (2). In order to facilitate the calculation, the angle circuit in the equivalent circuit in Fig. 3 is turned into a star circuit. Please refer to the first diagram, where me satisfies the following relationship, rl=R2*Rzl/(R2+Rzl+Rz2) , ❿ r2= R2*Rz2/(R2+Rzl.Rz2), r3=Rzl*Rz2/(R2+Rzl+Rz2) » Where the voltage is measured, the corresponding point voltages are equal, ie V1=V1, V2= V2 one, V3=V3 〆, V4=V4 one, V6=V6 The equivalent circuit shown in Fig. 3B can be directly used in formula (1) or public, formula (2) 'but the corresponding total X-axis resistance has Change, ie

Xplate &quot; =Rl+R3+rl+r2=Rl+R3+R2*Rzi/(R2+Rzl+Rz2)+R2*Rz 2/(R2+Rzl+Rz2) 18 200949658 =R1 +R2//(Rz 1 +Rz2)+R3&lt;Xplate, therefore, delta = Ryplate* ( 1-Yp〇sition/4096 ) -(Rxplate ^ *Xposition/4096)*(4096-V6)/ V5=〇» Obviously 'on the x-axis When there are two touch points, deita&lt;(Jelta - =0. Similarly, according to Fig. 4A and Fig. 4B, when there are two touch points on the y-axis, delta&gt; delta ^ = 〇. Φ Delta has the following rules: If only one point is pressed (single touch), the difference between the calculated value of equation (1) and the calculated value of equation (2) is close to 〇 because of single touch The calculated value error is small. If there are two points pressed in the X direction (double touch, and the y coordinates are the same), then delta&lt;0. If there are two points pressed in the Y direction (double touch, and the coordinates are χ The same), then delta>0. ❹ Ben (4) The actual reward is based on the value of the upper Wei's root county delta to determine the two touch points of a single point, the same y coordinate, and the same touch point. In a preferred embodiment, it is also del Ta sets the third and fourth thresholds THD3, THD4 'where THD3 is less than or equal to 〇, and THD4 is greater than or equal to 0'. The absolute values of the two thresholds can be equal. Then, when THD3 $ touches & STHD4, it is determined that there is one on the touch screen. Touch point; when the money is deleted, it is determined that the touch screen has two touch points of the same x coordinate; when THD3&gt;deltal, it is determined that the touch screen has two touch points of the same y coordinate. 19 200949658 To further understand the present invention, in the present invention, A touch screen detection method is proposed. Please refer to Fig. 7, which shows a schematic diagram of the method for detecting the position of the screen in the embodiment of the present invention. Step 600: Connect the connection terminal YP to the positive reference voltage and connect The terminal YN grounding 'measures the voltage VI on the connection terminal XP and the voltage V2 on the connection terminal XN; Step 602, connects the connection terminal XP to the positive reference voltage, the connection terminal XN to the ground, and measures the voltage V3 and the connection terminal w on the connection terminal YP. The voltage V4 is upper; in step 604, the difference V1_V2 between the voltage VI and the voltage V2 and the difference V3_V4 between the voltage V3 and the voltage V4 are calculated; step 606 'the difference V1-V2 and the difference V3-V4 and the , Two THD1 critical value, comparing THD2 'wherein THD1 billion or less, THD2 than 0, the absolute value of the threshold may be equal to two. Step 608, when THD1 彡V1-V2彡THD2 and THD1 彡V3-V4 &lt;THD2, it is determined that there are two touch points on the touch screen or two touch points having the same 乂 coordinate or y coordinate. Step 610, when V1-V2&lt;THD1 and V3-V4&lt;THD1, it is determined that there are two touch points on the touch screen and the coordinates satisfy Xl&gt;X2, y1&lt;y2. Step 612, when V1-V2&gt;THD2 and V3-V4&gt;THD2, it is determined that the touch screen has two touch points and the coordinates satisfy xl&gt;x2, yl&gt;y2. After step 608, it is further necessary to continue to determine whether there is currently a single touch point on the touch screen, or two touch points having the same X coordinate, or two touch points having the same y coordinate. The determining method is from step 614 20

Starting at 200949658. Connect the connection terminal YP to the positive reference voltage and the connection terminal XN to ground. Measure the voltage V5 on the connection terminal XP and the voltage on the connection terminal V6 °. Step 616, assuming only one touch point, calculate the assumptions by formulas (1) and (2) respectively. The first calculated value of the touch resistance of the touch point calculates the value Rz2. A step 618 'determines the difference delta of the first calculated value (four) and the second calculated value w, and compares the delta with the third and fourth critical values THD3, Na*, the towel THD3 is smaller than the transition, and the THD4 is greater than or equal to G The absolute values of the two thresholds can be equal. Step 620' at THD3SddtaSTHD4, it is determined that there is a touch point on the touch screen. Step 622 ' at ddta:&gt; THD4, two touch points having the same X coordinate on the touch screen are determined. At step 624', at THD3&gt;delta, two touch points having the same y coordinate on the touch screen are determined. So far, by detecting the obtained voltages V1 - V6, it can be judged whether there is a single touch point on the touch screen, or two touch points, and the arrangement of the two touch points. The foregoing description focuses on the number of touch points on the touch screen and the distribution detection technique. The following is a description of the subsequent operations. After determining the number and distribution of touch points on the touch screen, the position information of the touch points can be continuously obtained. The following describes how to obtain the position information of the touch point 21 200949658. After determining that it is a single contact, the touch point position can be obtained according to the prior art. Whether it is a two-point touch of the same y coordinate or a two-point touch of the same X coordinate, the two conductive layer panels with two touch points can be equivalent to the 2A map (R2=0 or R5=〇), or equivalent Figure 2B (R2 = 0 or R5 = 0). When it is determined that there are two touch points, the processor 280 can calculate the resistance values R2, R3, R5, and R6 according to the pre-determination algorithm and the six voltage values of V1-V6, and then according to R2, R3, R5, and R6. The value further calculates the position information of the two touch points. One of the purposes of the processor 28 is to calculate 8 unknown measured values: IU, R4, R2, R3, R5, R6, Rzl, and Rz2 '6 can be listed according to the six voltage values of V1-V6. Equations of R3, R5, R6, Rzl, and Rz2 plus two known equations

Xplate = Rl + R2 + R3 and Yplate = R4 + R5 + R6, so that the values of Rl ' R4 ' R2 , R3 , R5 , R6 , Rzl and Rz2 can be solved. Since the equivalent schematics of the conductive layer panels are different in the first and second cases, the six equations listed here are also different, and the following are specifically described. When it is determined that the two touch points and the coordinates satisfy xl>x2 ' yl> y2 or χ 2 ^ xl, y2 = yl or x2 = xl, y2 and y1, the reference to the second figure is as follows, according to the basic principle of the circuit, the listed (four) 6 The equations are described in detail. It should be noted that the following is assuming that the accuracy of the converter is magnetic, the difference between the positive and negative reference voltage is 4G96, Pl=Xplate/4Q96p2= /4096 选 gate control in the wiring gate When the unit peach is the third and fourth test 22 200949658 mode, assume: 1) Ra=R2//(Rzl+Rz2+R5); 2) R=Rzl+Rz2+R2+R5; 3) Ix=4096/( R1+R3+Ra); where Ιχ means χ If it is determined that the positions of the upper and lower endpoints of R2 (corresponding to two touch points respectively) are (Xl, yl) and (X2, y2), then there are: 4) R3= Pl*x2;

5) R2=Pl*(xl-x2); 6) R1=P1*(4〇96-x1); According to the above equations, two equations for χ1, χ2, 丨, y1, y2 can be obtained: R2 V4=Ix*R3+Ix*T *Rz2 /士..., R2 (Equation 1) V3=Ix*R3+Ix* λ *(Rz2+R5) (Equation 2). Based on the symmetry analysis, when the gate control unit 448 of the wiring gate is in the first and second test modes, it is considered that R5_&gt;R2, R4_&gt; R1, R6_&gt; R3, :b〇&gt;Ra 'P2_&gt;P1, Yl &gt;xl,y2 &gt;x2,, then have the following six equations: 2) R=Rzl+Rz2+R2+R5; 3) Iy=4096/(R4+R6+Rb); where iy denotes γ The current of the shaft. 4) R6=P2*y2; 5) R5=P2*(yl-y2); 6) R4=P2*(4〇96-yl); According to these 6 equations, we can get about χ1, χ2, (4), Bu 23 200949658 Two equations for y2: R5 V2=Iy*R6+Iy* R *Rz2 R5 (Equation 3) Vl=Iy*R6+Iy* R *(Rz2+R2) (Equation 4) Finally 'on wiring strobe When the gate control unit 448 is in the fifth and sixth test modes, there are: Rc=(Rzl+R2)//(Rz2+R5); Ip=4096/(Rc+R4+R3); wherein, Ip represents Current flowing from the Y layer to the χ layer; R=Rzl+Rz2+R2+R5; then: Rz2 + R5 V5=Ip*R3+Ip* R *R2 (Equation 5) Rzl + R2 V6=Ip*R3+Ip* R *Rz2 (Equation 6) Ο

The processor 280 then substitutes the voltage values V1-V6 into Equation 1_6, plus two known equations, Xplate=R1+R2+R3 and

Yplate=R4+R5+R6, so that the values of R2, R3, R5, R6, Rzl and Rz2 can be solved, and the position information of the two touch points, such as coordinates, can be further calculated. When it is determined that the two touch points and the coordinates satisfy xl>x2, yl&lt;y2 or xbu y2=yl or x2=xl, y2off yl, combined with reference to FIG. 2B, the following lists according to the basic principle of the circuit The equations are described in detail. It should be noted that the following is the assumption that the accuracy of the converter is the difference between the positive and negative reference voltages of the wristband is 4096. When the gate control unit 448 of the wiring gate is the third and fourth test 24 200949658 mode, it is assumed that 1) Ra=R2//(Rzl+Rz2+R5); 2) R=Rzl+Rz2+R2 +R5 ί 3) Ix=4096/(Rl+R3+Ra); where τ determines the upper and lower endpoints of R2 (positions are (xl, yl) and (X2, y2), then: , , ', 4 ) R3=P1*x2;

5) R2=Pl*(xl-x2); 6) R1=P1 *(4096-xl); yi According to the above six equations, two equations for χ1, 幻, 卜, y2 can be obtained: VS^RS ^f^Z (equation Γ) V4=Ix*R3+Ix^, (Rz2+R5) (Equation 2,). Based on the symmetry analysis, when the gate control unit 448 of the wiring gate is in the first and second test modes, it is considered that R5-&gt; R2, R4-&gt; Rl, R6_&gt; R3,

Rb-&gt;Ra ' P2-&gt;P1 ' yi_&gt;xi ' y2_&gt;x2,V2-&gt;V4,V1-&gt;V3, has the following six equations: 1) Rb=R5//(Rzl+ Rz2+R2); 2) R=Rzl+Rz2+R2+R5; ^Iy=40%/(R4+R6+Rb); wherein Iy represents the current of the γ-axis. 4) R6=P2*y2; 5) R5=P2*(yl-y2); 6) R4=P2*(4〇96-yl); According to these 6 equations, we can get about xl, x2, Rz and Rz2 , y Bu 25 200949658 The two equations of y2: R5 Vl=Iy*R6+Iy* and *Rz2 (Equation 3') R5 V2=Iy*R6+Iy*T *(Rz2+R2) (Equation 4') Φ Finally, when the gate control unit 448 of the wiring gate is in the fifth and sixth test modes, there are: Rc=(Rzl+R2+R5)//Rz2;

Ip=4〇96/(Rc+R4+R3); where 'Ip denotes the current flowing from the γ layer to the further layer; R=Rzl+Rz2+R2+R5; then:

V5=Ip*R3+Ip*^*R2 V6=Ip*R3+Ip!*!—*(R2+Rzl) R (Equation 5') (Equation 6') Then, the processor 280 will voltage value vi_v6 Substituting equation

1'-6' 'plus two known equations, Xplate=R1+R2+R3 and Yplate=R4+R5+R6, so that R1, R4, Magic, Magic, R5, R6, W can be solved. And Rz2, after which you can further calculate the position information of the two sides, such as coordinates. This allows you to find the location information for the two touch points in any distribution. To solve the solutions of these six homogeneous 6-element second-order equations, we can use the numerical calculation method of Newton iteration and the Wu Wenjun elimination method. For some specific situations, the above calculations can also be simplified. In the following, how to quickly find the distance between touch points for some situations is specifically described. 26 200949658 However, when only -__ is determined on the touch screen, this subsequent operation is not required. . The method of seeking _ touch points is different according to their distribution. The following are introduced one by one. 1. Find the distance between two points with the same y coordinate for the motion of the nickname. Please refer to Figure 3A. 'Because both the X conductive layer and the γ conductive layer have the resistivity of the line ί±. The value of the money to make the distance between the two touch points. It can be seen from the above that Fig. 3B is an equivalent circuit diagram after converting the angular circuit in Fig. 3A into a star circuit. The general idea of seeking for justice is to first look for 2, 13 and then ask for 1^. Since the two touch points having the 7th coordinate are used for the pumping symmetric motion, R1 = R3. According to the voltage and resistance relationship of the series circuit, in the following process, rl, r2, r3 can be obtained one by one to refer to the third figure, and the connection terminal γρ is connected to the positive reference voltage and the connection terminal ΥΝ is grounded, which can be obtained: ® R4= Yplate*(4096-Vl)/4096 Refer to Figure 3A. Connect the connection terminal γρ to the positive reference voltage and the connection terminal ΧΝ to ground. You can get: r3=(V6-V5)*R4/(4096-V6), R3+r2 =V5 *R4/(4096-V6) ( 1 ) Refer to Figure 3A for 'connecting the terminal XP to the positive reference voltage and the connection terminal XN to ground. Combined with the assumption R1=R3, you can get:

Rl+rl=R3+rl=(4〇96-V3)*(R3+r2)/V3 ( 2 ) Referring to Figure 3B, combined with the conversion relationship between the star circuit and the angle circuit, 27 200949658 know: R2=Xplate- 2*R3=rl+r2+rl*r2/r3 (3) • Simultaneous (1) (2) (3), can solve ri, r2, let e=R3+r2, f=R3+rl,c =(Xplate-ef)*i3,d= (f - e) + 4 * c, then get: rl=(d+fe)/2, • r2=d-(fe), reference R2=Xplate-2 *(f-rl), the relative size of R2 and Xplate can represent two

Xleii=XSCr*R2/XPlate. (where Xscr is the total length of the touch screen 或者 or the number of the elements 'Xlen is the length of the _X direction or the number of primitives), by which the movement trend of the current touch point and the expansion or contraction of the two touch points can be determined. degree. 2. Calculate the distance β between the two points when the _ x coordinate _ touch point is used for axisymmetric motion. Please refer to Figure 4A. Since both the X conductive layer and the Y conductive layer have linear electric alcohol, it is only a job. In order to obtain the large deviation of the _ touch point, it can be seen from the above that 'Fig. 4B is an equivalent circuit diagram after converting the angular circuit in Fig. 4A into a star circuit. The general idea of seeking R5 is to first find ',r3", and: then find R5. Because the two touch points with the same χ coordinate make axisymmetric motion, so R4=R6. According to the voltage and resistance relationship of the series circuit, below In the process, you can find Π, γ2, ι3 one by one. Refer to Figure 4, connect the connection terminal χρ to the positive reference voltage, and connect terminal 28 200949658 XN to ground, you can get: R3=Xplate*V3/4096; Reference 4A In the figure, connect the connection terminal YP to the positive reference voltage and the connection terminal ΧΝ to the ground, which can be obtained: r3=(V6-V5)*R3/V5; R4+r2=(4096-V6)*R3/V5 ; . Refer to Figure 4A Connect the connection terminal YP to the positive reference voltage and the connection terminal φ YN to ground. Combined with the assumption R4=R6, you can get: R4+rl= ( R4+r2 ) *Vl/(4096-Vl)= (4096-V6)* Vl*R3/ (V5*(4096~V1)), let eF=r2-rl=(4096&quot;V6)* _6-2*Vl)* R3/(V5*(4〇96 -VI); refer to 4B Figure, combined with the relationship between the star circuit and the angular circuit, know that r 1 +r2+rl *r2/r3=Yplate-R4-R6=Yplate-2*R4 Let M*r2=r3*(Yplate&quot;R3*(4096&quot; V6)*4096/(V5* (4096~V1))); 4&quot; d=A/(e*e + 4*f); 〇 r2=(d+e)/2; rl=(de)/ 2; R5=d+^r3; phase of R5 and Yplate For the size, it can represent the moving distance of two points, Yleii=YSCr*R5/YPlate. (where Yscr is the total length of the touch screen γ direction or the number of primitives 'Ylen is the length of two points in the γ direction or the number of primitives). The distance can determine the current trend of the touch point and the degree of expansion or contraction of the two touch points. 3. Find the two touch points of the coordinate relationship satisfying X2&lt;:?a, y2&lt;yl. 29 200949658 Level distance between points • For the convenience of calculation, assume that the coordinate relationship satisfies the two touch points of x2 &lt; x y2 &lt; yl is center symmetrical (the center of the touch screen), that is, assume R4 = R6 and R1 = R3. Let R2 = x, Rl=R3=p^)lat^x)2,(Yplaii^k*x) /2, k is a constant related to the slope of the current motion line. Please refer to Figure 2A to connect the connection terminal YP to the positive reference voltage, The connection terminal φ YN is grounded to obtain: 4096*((Yplate-k*x)*(x+k*x+Rzl+Rz2)/2+k*x*(Rz2+x))-Vl*( k* x*(Rzl+Rz2+x)+(Yplate-k*x)*(x+Rzl+Rz2+k*x))=0 (1) 4096*((Yplate-k*x)*(x+k *x+Rzl+Rz2)/2+k*x*(Rz2))-V2*(k!t! x*(Rzl+Rz2+x)+(Yplate-k*x)*(x+Rzl+Rz2 +k*x))=0 (2) See section 2A Connect the connection terminal YP to the positive reference voltage and the connection terminal to ground. You can get: 4096*((Xplate-x)*(x+k*x+Rzl+Rz2)/2+(k*x+Rz2)*x )-V5*((( ® Xplate-x)/2+(Yplate-k*xy2)*(x+k*x+Rzl+Rz2)+(x+Rzl)*(k* x+Rz2))= 0 (3) 4096*((Xplate-x)* (x+k*x+Rz 1 +Rz2)/2+(x+Rz 1 )*Rz2)-V 6*((( Xplate-x)/2 +(Yplate-k*x)/2)*(x+k*x+Rzl+Rz2)+(x+Rzl)*(k* x+Rz2))=0 (4) Please refer to Figure 2A, The connection terminal XP is connected to the positive reference voltage and the connection terminal XN is grounded. It can be obtained: 4096*((Xplate-x) * (x+k*x+Rz 1 +Rz2)/2+x* (Rz2+k*x)) -Vx* (x 30 200949658 *(Rzl+Rz2+k*x)+(Xplate-x)*(x+Rzl+Rz2+k*x))=〇( 5 ) 4096*((Xplate-x)* (x+k*x+Rzl+Rz2)/2+x*(Rz2))-Vxn*(x*(Rz . 1 +Rz2+k*x)+(Xplate-x)*(x+Rz 1 + Rz2+k*x))=〇( 6 ) It is known from the actual physical meaning that the above six equations must have solutions, and any four can solve a set of solutions. The remaining two equations are the four equations used for solving. Relevant, can be used for verification. • With the help of the matlab tool, the solution is Vx=V3, Vxn=V4, Vy=Vl, Vyn=V2, k= _l/4*(-4096*V5*Yplate-V5*Vx*Xplate+8192*Vx*Xplate +Vx n*Xplate*V5-2*V6*Xplate*Vx-(VxnA2*XplateA2*V5A2+163 84*V5*Vx*Xplate*Yplate*V6-8192*Vx*V5A2*Yplate*Xplat e+16777216*YplateA2 *V5A2+8192*Vxn*V5A2*Xplate*Yplat e-67108864*V5*Yplate*Vx*Xplate-4*Vxn*XplateA2*V5*V6 *Vx-32768*VxA2*XplateA2*V6+4*V6A2*XplateA2* VxA2-16 © 384*V5*XplateA2*VxA2-2*V5A2*XplateA2*Vx*Vxn+16384*

Vx*XplateA2*V5*Vxn+4*V5*XplateA2*VxA2*V6+V5A2*Xp lateA2*VxA2+67108864*VxA2*XplateA2-8*V5A2*Yplate*Vxn *Xplate*Vx+8*VxA2*V5A2*Yplate *Xplate)A(l/2))/V5/Xplate/ (Vx-2048); x= (-2048*V5*Xplate*kA2+V5*kA2*Vx*Xplate-2048*V5*Yplate *k-2048 *V5*k*Xplate+V5*k*Xplate*Vx-V6*Xplate*k*Vx+

4096*Vx*Xplate*k-2048*V5*Yplate-V6*Xplate*Vx+4096*V 31 200949658 x*Xplate+(4096*V5A2*YplateA2*k*Vx-2*VxA2*V6A2*Yplate *Xplate-8192 *V5*k*XplateA2*VxA2-2*V5A2*Yplate*kA2*Vx A2*Xplate-24576*V6*XplateA2*VxA2*k+67108864*k*VxA2* XplateA2+8192*Xplate* V6* Yplate* VxA2- 8192*Xplate*k* V5 *Yplate*VxA2+4194304*kA2*V5A2*YplateA2+2*V6*XplateA 2*k*V5*VxA2-8192*Xplate*V5*Yplate*VxA2+8388608*V5A 2*k* Yplate*Xplate+4194304*V5A2*kA2*XplateA2+l 6777216 φ *kA2*Xplate*V5A2*Yplate+8388608*V5A2*kA3*XplateA2+83 88608*Yplate*V5A2*Xplate*kA3+2*VxA2*V6A2*XplateA2 *k-8192*V5A2*kA3*XplateA2*Vx+2*V5A2*kA3*XplateA2*VxA2 +2*V6*Xplate*VxA2*V5*Yplate+8388608*k*V5A2*YplateA2 -4096*V6*YplateA2*V5 *Vx-2*VxA2*XplateA2*kA3*V6*V5-V5A2*kA2*VxA2*XplateA2-16777216*Vx*Xplate*kA2*V5*Y plate-4096*kA3*V5A2*Yplate*Vx*Xplate+4096* Vx*Xplate*k Λ2* V6* Yplate* V5+V5A2* YplateA2* VxA2+8192* V6*XplateA ® 2*kA2*Vx*V5+4096*V6*Xplate*k*Vx*V5*Yplate-4*V6 *Xp lateA2*kA2* VxA2* V5+4* V6*Xplate*k* VxA2* V5* Yplate-819 2* VxA2*XplateA2*kA2* V6-409 6* V5A2*XplateA2*kA4* Vx-16 777216* V5*XplateA2*kA3 * Vx+4096* V5*XplateA2*kA3 * V6* Vx+4194304*V5A2*YplateA2+24576*V5*kA2*VxA2*XplateA 2- 50331648*V5*kA2*Vx*XplateA2-50331648*Xplate*V5*Yp late*k*Vx-4096*V5A2*Yplate*kA2*Vx*Xplate+4194304*V5A 2*XplateA2*kA4+l 6777216* VxA2*XplateA2 *kA2+VxA2*Xpla V6A2+VxA2*XplateA2*kA4* Υ5Λ2+8192* VxA2*Xpl 32 200949658 ateA2*kA3 * ν5)Λ( 1 /2))/Vx/(V5 *k-V6+4096); The relative value of the value of x and the Xplate represents the exact distance between the two touch-point levels, Xlen=Xscr*x/Xplate. (among them

Xscr疋 total length of the X-direction of the touch screen or the number of primitives, and Qiu is the length of two points in the X direction or the number of primitives. 'Through this distance, the current trend of the touch point and the expansion or contraction of the two touch points can be determined. Degree. 4. Calculate the coordinate relationship to satisfy the distance between the two touch points of x2&lt;xl, y2&gt; yl for the convenience of calculation. Suppose the coordinate relationship satisfies the two touch points of x2&lt;xl, y2&gt;yl is center-symmetrical (touch screen Center), that is, R4=R6 and R1=R3 〇R2=x, Rl=R3=(Xplate-x)/2, R5=k*x, R4=R6=(Yplate-k*x) /2, k is a constant associated with the slope of the current motion line. Please refer to Figure 2B. Connect the connection terminal YP to the positive reference voltage and the connection terminal ❹ YN to ground. You can get: 4096*((Yplate-k*x)*(x+k*x+zl+z2)/2+k *x*(zl+x))-Vyn*(k*x *(zl+z2+x)+(Yplate-k*x)*(x+zl+z2+k*x))=〇(l) 4096*((Yplate-k*x)*(x+k*x+zl+z2)/2+k*x*(zl))-Vy*(k*x*(z 1 +z2+x)+ (Yplate-k*x) *(x+z 1 +z2+k*x))=0 (2) Please refer to Figure 2B, connect the connection terminal YP to the positive reference voltage and the connection terminal XN to the ground, which can be obtained: 4096 *((Xplate-x)*(x+k*x+zl+z2)/2+z2*x)-V5*((Xplate+Ypla te-xk*x)*(x+k*x+zl+ Z2)/2+(x+k*x+zl)*z2)=〇( 3 ) 33 200949658 4096*((Xplate-x)*(x+k*x+zl+z2)/2+22*( x+zl))-V6*((Xplate +Yplate-xk*x)*(x+k*x+zl+z2)/2+(x+k*x+zl)*z2) =0 ( 4 ) Please refer to Figure 2B'. Connect the connection terminal XP to the positive reference voltage and the connection terminal XN to the ground. You can get: 4096*((Xplate-x)*(x+k*x+zl+z2)/2+x*( Z2+k*x))-Vxn*(x*(zl - +z2+k*x)+(Xplate-x)*(x+zl+z2+k*x))=〇( 5 ) • 4096* ((Xplate-x)*(x+k*x+zH-z2)/2+x*(z2)&gt;Vx*(x*(zl+z2+k*x)+(Xplate-x)*( x+zl+z2+k*x))=〇( 6 ) It is known from the actual physical meaning that the above six equations must have solutions, and any four can solve a set of solutions. The remaining two equations are related to the four equations used for the solution and can be used for verification. With the help of matlab tool, Vx=V3, Vxn=V4, Vy=Vl, Vyn=V2, k=l/4 *(Xplate*V5*Vxn+8192*Vx*Xplate-2*V6*Vx*Xp ® late-4096*V5*Yplate-V5*Xplate*Vx-(-32768*V6*VxA2*Xpla teA2-2*XplateA2 *V5A2*Yxn*Vx+4*XplateA2*V5*Y6*VxA2+ 16384*Vx*V6*V5*Yplate*Xplate-67108864*Xplate*V5*Ypl ate* Vx+67108864* VxA2*XplateA2+8192*Xplate* V5A2 * Yplat e*Vxn-8192*Xplate*V5A2*Yplate*Vx-16384*V5*XplateA2* VxA2+16384*V5*XplateA2*Vxn*Vx+XplateA2*V5A2*VxA2+ XplateA2*V5A2*VxnA2+16777216*V5A2*YplateA2 -4*XplateA 2*V5*Vxn*V6*Vx+4*V6A2*VxA2*XplateA2-8*Xplate*V5A2 *Yplate*Vxn*Yx+8*Xplate!,5V5A2*Yplate*VxA2)A(l/2 ))/Xplat 34 200949658 e/V5/(-2048+Vx) x=(Xplate*V5*k*Vxn-Xplate*V5*k*Vx+Xplate*V5*Vxn-V5 *Xplate*Vx+(XplateA2*V5A2 *VxnA2*kA2-29|skA2*V5A2*Xpla teA2*Vx*Vxn+2*XplateA2*V5A2*k*VxnA2-8*XplateA2*V5A2 *k*Vxn*Vx+5*V5A2*XplateA2*VxA2*kA2+ 6*XplateA2*V5 八2*k* VxA2+4*Xplate* V5A2* Yplate* Vxn* Vx-8192*Xplate* Yp Φ

<br><br><br><br><br><br><br><br><br><br> k*VxA2-2*Xplate*Yplate*V5A2*VxA2+167

77216*XplateA2* V5A2*kA2-2*Xplate* Yplate* V5A2* VxnA2)A (l/2))/V5/(-Vx+Vxn+4096*k) The calculated value of x and the relative size of Xplate The exact distance in the horizontal direction between the two touch points, XknsXscrHcx/XpWe. (where Xscr is the total length of the X-direction of the touch screen or the number of primitives, Xlen is the length of the two-point χ direction or the number of primitives), by which the motion trend of the current touch point and the expansion or contraction of the two touch points can be determined. Degree. Here, the calculation result of k, let us complete the monitoring of similar rotation motion, the rate is kl, then 'the inverse tangent operation on kl, set the inclination at any time.

Xc^ItL^Ysc^y/Yplate _h± Yscr*Xpalte Xlen Xscr*x/Xplate X^^Te knows the current rotation angle. It will be apparent that those skilled in the art can make various modifications and variations to the present invention without departing from the scope of the invention. Accordingly, it is intended that the present invention covers the modifications and variations of the inventions and the scope of the invention.

36 200949658 [Simple description of the diagram] The first diagram is an equivalent diagram of the conventional technical resistance type hard screen at _ touch point; the first picture is the resistive touch screen in the invention with two touch points and the coordinates satisfy x2&lt; The equivalent circuit diagram of xl, y2 &lt;yl; Figure 2B is an equivalent circuit diagram of the resistive touch screen of the present invention having two touch points and the coordinates satisfying x2 &lt; xl, y2 &gt;yl; In the present invention, the resistive touch screen has an equivalent circuit diagram when there are two touch points and the coordinates satisfy x2 and x1, y2=yl; and FIG. 3B shows the angle circuit in the equivalent circuit in FIG. 3A is converted into a star circuit. After the equivalent circuit diagram; '' 4A is the equivalent circuit diagram of the resistive touch screen in the present invention when there are two touch points and the coordinates satisfy x2=xl, y2 common yl; FIG. 4B is the 4A picture FIG. 5 is a schematic structural diagram of a device for detecting a touch screen according to an embodiment of the present invention; FIG. 6 is a schematic diagram of a touch screen provided by an embodiment of the present invention; Operation of the gate in the device The schematic diagram; and FIG. 7 is a schematic flowchart of a touch screen multi-touch point detecting method according to an embodiment of the present invention. 37 200949658

[Main component symbol description] 220 Conductive layer panel 240 Wiring gate 242 Positive reference voltage gating unit 244 Detection signal gating unit 246 Negative reference voltage gating unit 248 Gating control unit 260 Analog digital converter (ADC) 280 processing ΧΡ ΧΝ ' ΧΝ ΎΝ Connection Rl ' R2 ' R3 &gt; R4 &gt; R5 ' R6 Resistance Rz Calculated value VERF + Positive voltage VERF - Negative voltage V Bu V2, V3, V4, V5, V6 Voltage value 38

Claims (1)

200949658 X. Patent application scope: 1. A touch screen detecting device, characterized in that the device comprises: a conductive layer panel comprising a first conductive layer panel and a second conductive layer panel, wherein each electrical layer panel has a positive connection Terminal and negative terminal; and 2, a wiring gate for strobing one of the two positive terminals to connect a positive reference voltage, and one of the two negative terminals is strobed to a negative reference voltage, and the four of the conductive layer panels are connected One of the two connection terminals except the two connection terminals that are connected to the positive and negative reference voltages is strobed as the detection signal terminal. If the application is specifically described in the first paragraph of the Wei Wei, the basin is characterized in that the wiring gate comprises a positive reference voltage strobe unit, a detection signal strobe unit, a negative reference voltage strobe unit and a strobe. The control unit, wherein the reference fabric is in accordance with the control of the viewing unit, one of the two positive terminals is connected to the positive reference voltage, and the negative reference voltage gating unit connects the two negative terminals according to the control of the gating control section. One of the terminals is connected to the negative reference voltage, and the detection signal selection element is tested according to one of the four terminals in the Weilang single electrical layer board, and the gate control unit has six controls. Mode, in the f 7 mode, the main pole of the second conductive layer panel and the negative terminal of the second conductive layer panel and the detection 39 200949658 j gate unit strobes the positive connection end of the first conductive layer panel, and the mold handle, the selected wealth control element controls the positive reference voltage:: strobes the positive connection end of the second conductive layer panel, and the negative reference electrical strobe a negative connection end of the second conductive layer panel and a negative connection terminal for detecting the second selection and early strobing of the first conductive layer panel, and in the second mode, the strobe control unit controls the positive reference voltage strobe unit to strobe - The positive connection end of the conductive layer panel, the negative reference voltage gating unit, the Wei-conductive layer panel (four) pole connection end, and the positive connection end of the detection L-plane-passing unit Wei second conductive box board, the fourth mode is selected The control unit controls the positive reference voltage selection L unit to strobe the positive connection end of the first conductive layer panel, the negative reference power f strobe unit strobes the first conductive layer, the drain connection terminal and the detection domain strobe unit surface second a drain connection terminal of the conductive layer ©, in the fifth mode, the gate control unit controls the positive reference terminal of the second conductive layer panel and the negative reference voltage gate unit to be gated by the positive reference voltage gate unit _ conductive layer panel The pole connection end and the detection signal gating unit are respectively connected to the red-pole connection end of the conductive layer panel; and in the sixth mode, the gate control unit controls the positive reference connection of the positive reference voltage gating unit to the second conductive layer panel The terminal and the negative reference voltage strobe unit strobe the negative terminal of the first conductive layer panel and the detection signal strobe unit strobes the negative terminal of the second conductive layer panel. A method for detecting a touch screen, the touch screen comprising a first conductive layer panel and a second conductive layer panel, wherein each conductive layer panel has a positive electrode connection end and a negative electrode connection end, wherein the method comprises: 40 200949658 The positive connection end of the conductive layer panel is connected with a positive reference voltage, the negative connection end of the second conductive layer panel is connected to the negative reference voltage, and the voltage value VI of the positive connection end of the first conductive layer panel is detected; the second conductive layer panel is The positive terminal is connected to the positive reference voltage, the negative terminal of the second conductive layer panel is connected to the negative reference voltage, and the voltage value V2 of the negative terminal of the first conductive layer panel is detected; the positive terminal of the first conductive layer panel is connected to the positive terminal a reference voltage, connecting a negative reference terminal of the first conductive layer panel to a negative reference voltage, and detecting a voltage value V3 of the positive terminal of the second conductive layer panel; connecting the positive terminal of the first conductive layer panel to the positive reference voltage, The negative connection end of the first conductive layer panel is connected to the negative reference voltage, and the second conductive is detected The voltage value of the negative terminal of the panel is V4; the positive terminal of the second conductive layer panel is connected to the positive reference voltage, the negative terminal of the first conductive layer panel is connected to the negative reference voltage, and the positive terminal of the first conductive layer panel is detected. Voltage value V5 ; and ® connect the positive terminal of the second conductive layer panel to the positive reference voltage, connect the negative terminal of the first conductive layer panel to the negative reference voltage, and detect the voltage value of the negative terminal of the second conductive layer panel V6 . 4. The method of detecting a touch panel according to claim 3, further comprising: ??? determining the number of current touch points and the distribution information based on the detected voltage values. 5. The method for detecting a touch panel according to claim 4, wherein the determining the number and distribution information of the touch point 41 200949658 according to the detected voltage values comprises: calculating a voltage VI and a voltage V2 The difference between V1_V2 and the difference between voltage V3 and voltage V4 is V3-V4; the difference V1-V2 and the difference V3-V4 are compared with the first and second thresholds THD1, THD2, whose THD1 is smaller than Equivalent to 〇, TJJD2 is greater than or equal to 0; when THD1=V1-V2=THD2 and THD1=V3-V4=THD2, it is determined that there are single touch points on the touch screen or two touch points with the same χ coordinate or y coordinate; When V2 &lt;THD1 and V3-V4&lt;THD1, it is determined that the touch screen has two touch points whose coordinates satisfy xl&gt;x2, yl&lt;y2; and when V1-V2&gt;THD2 and V3-V4&gt;THD2, it is determined that the touch screen has coordinates Two touch points of xl&gt;x2, yl&gt;y2. 6. The method for detecting a touch screen according to claim 5, wherein the determining that the touch screen has a single touch point or has the same X when THD1=V1-V2=THD2 and THD1=V3_V4=THD2 After the two touch points of the coordinate or the y coordinate, the method further includes: calculating a first calculated value Rz1 and a second calculated value Rz2 of the touch resistance of the assumed touch point by the voltages V5, V6; obtaining the first calculated value Rzl and the second calculation The difference of the value Rz2 is as shown in the figure, and the delta is compared with the third and fourth thresholds THD3, THD4, wherein THD3 is less than or equal to 0, and THD4 is greater than or equal to 〇; in THD3^delta'THD4, it is determined that there is a touch on the touch screen. 42 200949658 200949658 7 Ο 摸 Touch; At delta>THD4, 'determine the two touch points on the touch screen with the same χ coordinates; and at THD3&gt;delta' to determine the two touch points with the same y coordinates on the touch screen. The method for detecting a touch panel according to claim 4, further comprising: 'calculating the position information of the current touch point based on the detected voltage values. A method for detecting a touch screen, the touch screen comprising a first conductive layer panel and a second conductive layer panel, wherein each of the conductive layer panels has a positive electrode connection end and a negative electrode connection end, wherein the touch screen comprises: a second conductive layer The positive connection end of the panel is connected with a positive reference voltage, the drain connection end of the second conductive layer panel is connected to the reference voltage, and the voltage value of the positive connection end of the first conductive layer panel is detected; the positive connection of the second conductive layer panel is connected Connecting the positive reference voltage to the terminal, connecting the negative terminal of the second conductive layer panel to the negative reference voltage, detecting the value of the negative terminal of the first conductive layer, and connecting the positive terminal of the first conductive layer to the positive reference voltage. - connecting the negative reference terminal of the conductive layer panel to the negative reference electric house, and detecting the voltage value of the positive connection end of the second conductive layer panel, connecting the positive connection end of the first conductive layer panel to the negative connection end of the positive conductive first conductive layer panel The negative reference voltage will detect the voltage at the negative terminal of the second conductive layer panel and 43 200949658 calculate the voltage VI and The difference V1_V2 between the voltage V2 and the difference V3-V4 between the voltage V3 and the voltage V4; • Comparing the difference V1_V2 and the difference V3-V4 with the first and second thresholds THD1, THD2, wherein THD1 is smaller than Equivalent to 〇thd2 is greater than or equal to 0; when THD1=V1-V2=THD2 and THD1=V3-V4=THD2, it is determined that there are two touch points on the touch screen or two touch points with the same χ coordinate or y 〇 coordinate; When V2 &lt;THD1 and V3_V4&lt;THD1, it is determined that the touch screen has two touch points whose coordinates satisfy Χΐ&gt; χ2, yl &lt;y2; and when V1-V2 &gt; THD2 and V3_V4 &gt; THD2, it is determined that the touch screen has coordinates satisfying xl &gt; x2 Yl&y;y2 two touch points. 9. The method for detecting a touch screen according to claim 8, wherein the positive connection end of the second conductive layer panel is connected to the positive reference voltage, and the negative connection end of the conductive layer of the second conductive layer is connected to the negative connection end. Referring to the electric wave, and detecting the voltage value V5 of the positive terminal of the first conductive layer panel. Connecting the positive terminal of the second conductive layer panel to the positive reference voltage, and connecting the negative terminal of the first conductive layer panel to the negative reference voltage, And detecting a voltage value V6 of the negative terminal of the second conductive layer panel; calculating a first value Rzl and a second calculated value of the touch resistance of the assumed touch point by V5 and V6; calculating the first calculated value (four) and the second Calculate the difference _ of the value (4) and compare the delta with the third and fourth thresholds THD3, τη〇4 ' 44 200949658 where THD3 is less than or equal to 0 and THD4 is greater than or equal to 0; in THD3SdeltaSTHD4, it is determined that there is a touch point on the touch screen In delta>THD4, two touch points having the same X coordinate on the touch screen are determined; and in THD3 &gt;delta, it is determined that the touch screen has the same y seat The two - touch points. Φ 10. The method for detecting a touch screen according to claim 8, wherein the method further comprises: calculating a distance between the two touch points according to V1-V6 when determining that there are two touch points on the touch screen. 45