TW201023019A - Input device comprising resistive touch panel and calculating method of touch position thereof - Google Patents

Abstract

Provided are an input device and method of calculating a touch position in the same. The input device includes a touch panel having a plurality of electrodes in which resistances between the respective electrodes and a touch position vary according to the touch position, a sampling clock signal generator for outputting a sampling clock signal, a first switch for applying the sampling clock signal to some of the electrodes in sequence, a delay element for delaying a signal of a delay node connected with at least one of the electrodes, a delay measurer for measuring and outputting delay differences between the signal of the delay node and the sampling clock signal, and a coordinate calculator for receiving the delay differences and calculating coordinates of the touch position.

Description

201023019 VI. Description of the Invention: [Technical Field] The present invention relates to an input device having a resistive touch panel, and in particular to a delay difference using a plurality of measurement signals through a touch panel. An input device that determines the touch position and a method for calculating the touch position for the input device. [Prior Art] Personal computers (PCs), portable communication devices, and other information processing devices use a variety of input devices to operate a variety of functions. Recently, input devices having a touch panel have been frequently used. Generally, the touch panel is mounted on the surface of the display, such as a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma panel (PDP), or an electroluminescence (EL) display, and can be detected to be touched by an object. Touch the location. The display panel is mounted on the screen of the display of the computer system or the portable information terminal, so that the user can input information on the screen with a hand or a pen instead of using a keyboard or a mouse. Indium tin oxide (ITO) (indium tin mixed oxide) conductive film can be used to manufacture touch panels. Touch panels include resistive, capacitive, ultrasonic sensing, optical (out-of-line) sensors, and electromagnetically-sensitive touch panels. The resistive touch panel has two resistive sheet mats separated by spacers, and the two sheet mats are brought into contact by pressing. Figure 1 illustrates the composition of a conventional conventional input device having a four-wire resistive touch panel. The input device includes a touch panel 10, a first switch 21, a second switch 22, a third switch 23, a power supply 30, and a 201023019

Jio^t pii voltage measuring device 40. The touch panel i includes an upper sheet mat and a lower sheet mat 12. The upper sheet mat 11 has a first electrode 111 and a second electrode 112 at both ends in a first direction, for example, an x coordinate axis. The lower sheet pad 12 has a third electrode 121 盥 four electrodes 122 in a second direction, for example, a y coordinate axis. /, The function of each block shown in Figure 1 is explained below.阻抗 The impedance between the touch position on the touch screen ίο and the electrodes m, 112, 121 and 122 varies depending on the touch position. That is, when an object, such as a hand or a pen, touches a position on the upper sheet mat 11, the upper sheet stack 11 is electrically connected to the lower sheet stack 12. The touch position and the electrodes to which the voltage is applied, lu, 112, 121, and 122 are resistant according to the touch position. The anti-the first switch 21 and the second paste 22 sequentially connect the power supply 3 to the upper sheet 11 The lower layer sheet 12 is connected, and the third switch phantom connects the electric volume 4G to the lower sheet 塾12 and the upper sheet 塾u. The first to second switches 21 to 23 can be controlled by a controller, although the controller is not shown in the drawings. Fig. 2 is an equivalent circuit diagram for explaining the operation of the conventional input device having the resistive touch panel of Fig. 1. In Fig. 2, τ is the touch position R1A is the first electrode of the upper sheet ( (1) The equivalent impedance with the touch position, R1B is the balance between the second electrode 112 of the upper layer 塾u and the position τ, and R2A is the difference between the fourth pole 122 of the lower sheet 塾12 and the touch position. The resistance and the chatter are the equivalent impedance between the third electrode 121 of the next 12 and the touch position τ. 201023019 jio*t/pu Referring to Fig. 1 and Fig. 2, the operation of the above conventional input device will be described below. First, the first voltage Vy for determining the position in the y-axis direction is measured. More specifically, the first switch 21 is connected to the power supply 30 and the point a, the second switch 22 is connected to the ground voltage and the point a, and the third switch 23 is connected to the voltage measuring devices 40 and c. Therefore, the voltage of the power supply 30 is applied to the fourth electrode 122 of the lower sheet pad 12, the ground voltage is applied to the third electrode 121 of the lower sheet pad 12, and the voltage measuring device 40 is connected to the ground voltage and the touch position T. And measuring the first voltage Vy. The voltage of the power supply 30 is represented by Vb, and the first voltage Vy is determined by the following equation:

After Vy = R2A + R2BxVb, the second voltage Vx for determining the position in the x-axis direction is measured. More specifically, the first switch 21 is connected to the power supply 30 and the c-point, the second switch 22 is connected to the ground voltage and the c-point, and the third switch 23 is connected to the voltage measuring device 40 and the point a. Therefore, the voltage of the power supply 30 is applied to the second electrode 112 of the upper sheet pad 11, the ground voltage is applied to the first electrode 111 of the upper sheet pad 11, and the voltage measuring device 40 is connected to the ground voltage and the touch position T. Between and measuring the second voltage Vx. The power supply 30 is represented by vb. The second voltage vx is determined by the following equation: R1A π

Vy =-x Vb

The first voltage Vy of R1A + R1B is proportional to the equivalent impedance R2B between the third electrode 12i of the lower sheet pad 12 and the touch position T, and the impedance R2B is proportional to the third electrode 121 of the lower sheet pad 12 and the touch position τ the distance between. Therefore, the first voltage Vy is proportional to the distance between the third electrode ι 21 of the lower sheet pad 12 and 201023019 ^ x υτ / touch position τ. The conventional input device converts the first voltage Vy measured by the voltage measuring device 40 into a digital value using an analog to digital (A/D) converter (not shown), and uses the converted digital value to identify along the digital value. The touch position of the y-axis. Further, the 'second voltage Vx is proportional to the equivalent impedance ria between the first electrode 111 of the upper sheet pad 11 and the touch position T, and the impedance R1A is proportional to the first electrode η丨 and the touch position T of the upper sheet pad 11. the distance between. Therefore, the second voltage Vx is proportional to the distance between the first electrode 111 of the upper sheet pad n and the touch position T. The conventional input device converts the second voltage Vx measured by the voltage measuring device 40 into a digital value using an A/D converter, and uses the converted digital value to recognize the touch position along the x-axis. However, the power supplied by the power supply 30 is consumed by the impedances R2A and R2B or R1A and R1B, so the conventional input device consumes a large amount of power. In addition, the identification of the touch position requires an A/D converter, and the accuracy with which the input device can recognize the touch position is determined by the performance of the A/D converter, for example, the degree of resolution. More politely, the A/D conversion is set to operate at high speeds to increase the operating speed of conventional input devices, and the resolution of the 趟 converter must be increased to improve the accuracy of the input device. The moth knows that driving a high-resolution A/D converter at high speed can transfer a large amount of power and increase the difficulty of operation. Moreover, for the above reasons, in the conventional input rate, it takes a long period of time to recognize the touch position. In the case of low force [Summary of the Invention] and the current power consumption of the device and the resistance touch panel capable of operating at a south speed. 201023019 j io*t/pii The present invention also provides a planting device to calculate a touch location. The present invention provides an input device comprising a touch panel, a sampling clock signal generator, a first switch, a delay element, a delay meter, and a coordinate calculator. The touch panel has a plurality of electrodes, wherein an impedance between each of the electrodes and a touch position changes according to the touch position. The sampling clock signal generator is used to output a sampling clock signal. The first switch is configured to sequentially apply the sampling clock signal to the plurality of electrodes. The delay element is configured to delay the signal of a delay node, the delay node connecting at least one of the plurality of electrodes. The delay detector is configured to measure and output a delay difference between the signal of the delay node and the sampling clock signal. A coordinate calculator is operative to receive a delay difference of the delay meter output and calculate a coordinate of the touch position. In one embodiment of the invention, the delay element described above includes a capacitor coupled between the delay node and a ground voltage. The signal of the delay node is delayed by the impedance of one of the touch panels and the capacitance of the capacitor. The impedance is between an electrode to which the sampling pulse signal is applied and an electrode connected to the delay node. In an embodiment of the invention, the delay detector comprises a delay pulse output unit and a comparator. The delay pulse output unit is configured to detect the level of the signal of the delay node and output a pulse signal. The comparator is configured to receive the pulse signal and the sampling clock signal, measure a delay difference between the pulse signal and the sampling clock signal, and output the delay difference as the delay node The delay between the signal and the 201023019 〇i //pif sampling clock signal.

In still another embodiment of the invention, the delay detector includes a signal detector and a controller. The signal detector is configured to determine that the sampling clock signal is input to the delay detector through the delay node and output a signal according to the result of the mosquito. The controller is configured to change according to the side signal—the control code until the pulse region of the sampling clock signal is _fg_hfeshGld), and the pulse width of the sampling clock signal in the domain becomes the (four) limit value. The control code, the output-delay difference is used as a delay difference between the signal of the delay node and the sampling clock signal, wherein the sampling clock signal generator responds to the sampling of the control code Pulse width of the pulse / In the embodiment of the present invention, the touch panel includes a first sheet and a second sheet b, the first sheet has a first electrode and a second electrode, and the electrode is disposed in a first direction At both ends of the first sheet. The first sheet has a third electrode and a fourth electrode, and is placed at both ends of the second sheet mat in a second direction perpendicular to the first direction. In an embodiment of the invention, the first-stage sequentially applies the sampling clock signal to the first electrode and the third electrode. The input device further includes a first switch to apply the sampling clock signal to the device, and [[the electrode is the second switch, the third electrode and the fourth delay node are connection. When the first switch applies the sampling pulse signal to the third electrode, the second switch sequentially connects the electrode and the second electrode to the delay node. In an embodiment of the present invention, the second switch 'in the ninth 201023019 JiOH/pn switch applies the sampling clock signal to the first electrode, and additionally the second electrode The delay node is connected. When the first switch applies the sampling clock signal to the third electrode, the fourth electrode is additionally connected to the delay node. When the touch panel is not touched, the second electrode or the fourth electrode is additionally connected to the delay node. In the embodiment of the present invention, the delay measuring device is configured to apply the sampling clock signal to the first electrode and the second switch to connect the third electrode with the first switch When the node is delayed, the delay difference at this time is measured and output to the coordinate calculator as the first delay difference. When the first switch applies the sampling clock signal to the first electrode and the second switch connects the fourth electrode to the delay node, measuring a delay difference at this time and as a second Delaying the difference and outputting to the coordinate value ^ when the first-off is applied to the sampling clock signal to the first electrode and the second switch is connected to the first electrode and the delay node The delay difference at this time is measured and extended as a third to the coordinate calculator. Measuring a delay difference at this time and as a fourth when the first-time application of the sampling = signal to the third electrode and the second connection of the second electrode to the delay node The difference is delayed and output to the coordinate calculation ϋ. Measuring the delay difference at this time and as the fifth when the first-off is applied to the sampling-time pulse to freshen the first electrode and the second-side is connected to the second electrode and the delay node The difference is delayed and output to the coordinate calculator. When the first switch applies the sampling clock signal to the third electrode and the second switch connects 201023019 J ιοτ/pif to the fourth electrode and the delay node, the measurement is performed at this time. The difference is delayed and output to the coordinate calculator as a sixth delay difference. In an embodiment of the invention, the delay detector measures and outputs the fifth and sixth delay differences when the touch panel is not touched. In an embodiment of the present invention, the coordinate calculator described above receives the first to sixth delay differences, calculates an impedance between each of the first to fourth electrodes, and the touch position and Calculate the coordinates of the touch position. In an embodiment of the present invention, the coordinate calculator calculates a first difference between the first delay difference and the second delay difference, and the third delay difference and the fourth delay difference The second difference between the two. The first difference and the second difference are respectively divided by the fifth and the sixth delay differences, and the plurality of impedances are calculated. In an embodiment of the present invention, when the first to the fourth delay difference is a specific value or exceeds the specific value, the coordinate calculator determines that the touch panel is not touched. In an embodiment of the invention, the input device further includes a first resistor to the second resistor. The first resistor is connected between the first switch and the sampling clock signal generator. The second resistor is coupled between the second switch and the delay node. The first resistor and the second electrical & two material may be the same as the first and second foil pads. In another embodiment of the invention, the touch panel comprises a quadrangular first wafer pad and a quadrangular second foil pad. The square first thin 11 201023019

a J 1 /J/AX chip having an output electrode formed on one edge of the quadrangular first sheet bundle, wherein the quadrangular second sheet pad has first to fourth electrodes formed on the square Four corners of the two sheets, wherein the output electrodes are connectable to the delay node. In another embodiment of the present invention, the first switch sequentially applies the sampling clock signal to the first electrode to the fourth electrode. In another embodiment of the present invention, the delay measuring device measures a delay difference and serves as a first delay difference when the first switch applies the sampling clock signal to the first electrode. Outputting to the coordinate meter, the measurement output is applied to the first switch by the sampling clock signal to the second electrode, and the delay difference is used as the second delay difference to the coordinate calculator, Measuring a difference in delay when the first switch applies the sampling clock signal to the second electrode and as a third delay difference to the coordinate calculator, and measuring output at the first switch A delay difference when the sampling clock signal is applied to the fourth electrode is applied and is used as a fourth delay difference to the coordinate calculator. In another embodiment of the present invention, the coordinate calculator receives the first to fourth delay differences, and calculates the first electrode to the fourth electrode and the touch position. The impedance between the two, and the coordinates of the touch position are calculated. In still another embodiment of the present invention, the coordinate calculator described above calculates a difference between the first to fourth delay differences, divides the calculated difference by two, and calculates the plurality of impedances. In another embodiment of the present invention, the coordinate calculator described above determines the touch when the 12 201023019 ^ J. UT / the first to the fourth delay difference is a specific value or exceeds the specific value. The control panel is not touched. In another embodiment of the invention, the wheeling device further includes a first resistor and a second resistor. The first resistor is coupled between the first switch and the sampling clock signal generator. The second resistor is coupled between the second switch and the delay node. The materials of the first and second resistors are the same as the first and second sheet pads. In the third embodiment of the present invention, the touch panel includes a first sheet mat and a second sheet mat. The first sheet mat has a plurality of first touch panels extending in a first direction. The plurality of first touch panels are disposed in a second direction perpendicular to the first direction, and the two ends of each of the first touch panels are connected to corresponding ones of the plurality of electrodes. The second sheet pad has a plurality of second touch panels extending in the second direction. The plurality of second touch panels are disposed in the first direction, and the two ends of the second touch panels are connected to the corresponding ones of the plurality of electrodes. In a third embodiment of the present invention, the input device further includes a second switch, and the sampling signal is applied to the first switch to connect one of the plurality of first touch panels. The second switch sequentially connects the electrodes connected to the two ends of the plurality of second touch panels to the delay node. When the first switch applies the sampling pulse signal to the electrode of one of the plurality of second touch panels, the second switch=order will be connected to the plurality of first The electrodes at the two ends of the touch panel are connected to the delay node, and the first switch sequentially applies the sampling clock signal to the electrode of one of the plurality of first touch panels and the connection 13 201023019 Connecting the electrodes of one of the plurality of second touch panels. In a second embodiment of the present invention, the delay detector measures and outputs a delay difference according to each situation, wherein the plurality of conditions apply the sampling clock signal to the first switch to connect the An electrode of one of the plurality of first or second touch panels and the second switch connects an electrode connected to both ends of the first or second touch panel to the delay node. In a third embodiment of the present invention, the coordinate calculator described above receives the plurality of delay differences, calculates an impedance between each electrode and the touch position, and calculates a coordinate of the touch position. In a third embodiment of the invention, the input device further includes a first resistor and a second resistor. The first resistor is coupled between the first switch and the sampling clock signal generator. The second resistor is coupled between the second switch and the delay node. The materials of the first and second resistors may be the same as the first and second touch panels. The present invention proposes a method of calculating a touch position in an input device having a touch panel. The touch panel has a plurality of electrodes, and an impedance between each of the electrodes and a touch position changes according to the touch position. And, a delay element is used to delay the signal of a delay node, and the method includes the following steps. Sampling pulse signal application step: sequentially sampling the pulse signals to the plurality of electrodes. Delay step: connecting at least one of the plurality of electrodes to the delay node. Delay measurement step: measuring a delay difference between the signal of the delay node and the sampling clock signal. And a coordinate calculation step of: receiving a delay difference of the delay measurement step, calculating an impedance between each electrode and the touch position, and calculating the touch position 14 201023019, «^xu^/ριί coordinates. In an embodiment of the invention, the delay measuring step includes the following steps: delaying the pulse outputting step: detecting the level of the signal of the delay node and outputting a pulse signal. And a comparing step of: measuring a difference in delay between the pulse signal and the sampling clock signal, and outputting the delay difference as the signal between the delay node and the sampling clock The difference in delay. Φ In another embodiment of the present invention, the delay measuring step described above may include the following steps. The signal detecting step determines whether the sampling clock signal is input to the delay measuring device via the delay node, and outputs a detecting signal according to the determined result. And a control step of: changing a control code according to the detection signal until a pulse width of the sampling clock signal is a threshold value, and the pulse width of the sampling pulse signal is the threshold value And outputting a delay difference corresponding to the control code as a delay difference between the signal of the delay node and the sampling clock signal, wherein the sampling clock signal giving step comprises: according to the control code To change the pulse width of the sampling clock signal output. In an embodiment of the method of the present invention, the touch panel has a first sheet and a second sheet. Both ends of the first sheet bundle are provided with first and second electrodes in a first direction. The second wafer pad has third and fourth electrodes disposed in a second direction perpendicular to the first direction. The sampling clock signal applying step includes sequentially applying the sampling clock signal to the first and third electrodes, and the delaying step comprises: applying the pulse signal to the sampling signal In the first electrode, the third and the 15 201023019 ^ Ί 〇 * Τ / ρι χ are sequentially connected in series, which is extreme to the delay node. And connecting the first and the second electrodes to the delay node when the sampling pulse signal is applied to the second electrode. In an embodiment of the method of the present invention, the delaying step further comprises: when the sampling clock signal is applied to the first electrode, and additionally connecting the second electrode reading delay node. When the sampling pulse signal is applied to the second electrode, the fourth electrode is additionally connected to the delay node. In an embodiment of the method of the present invention, the delay measuring step includes measuring when the sampling clock signal is applied to the first electrode and the third electrode is connected to the delay node. The difference in delay at this time is taken as the first delay difference. When the sampling pulse signal is applied to the first electrode and the fourth electrode is connected to the delay node, the delay difference at this time is measured and used as the second delay difference. At the sampling clock, the number is applied to the third electrode and the first electrode is connected to the delay lag point' and the difference in delay at this time is output as the third delay difference. When the sampling pulse signal is applied to the third electrode and the two electrodes are connected to the slave point, the delay and the output delay are the fourth series difference. When the pulse sampling is applied to the first electrode and the second electrode is connected to the delay node, the delay difference at time f is measured as the fifth delay difference. In the sampling clock: = the third electrode is applied and the fourth electrode is connected to the wheel delay difference as the sixth delay difference. In the embodiment of the method of the present invention, the above coordinate calculation step 201023019 The steps. A difference calculation step: subtracting a delay difference from the first delay difference to calculate a first difference, and a fourth delay from the third delay to calculate a second difference. a ratio calculation step; an L first difference divided by the fifth delay difference to calculate a first ratio, and a second difference divided by the sixth delay difference to calculate a second anti-calculation step: using the first Determining, between the first to the fourth electrodes, and the touch position, and the 'coordinate value calculation step, with the second ratio: causing (four) a plurality of impedances to calculate the touch position The coordinates of the coordinates. Lu

In another embodiment of the method of the present invention, the touch panel has an angular first sheet and a square second sheet. The output electrode 7 is formed on the side of the square. The first to fourth electrode shapes are formed in the corner of the second thin (four) of the square. The sampling pulse hopping step includes sequentially applying the sampled gland signals to the first to fourth electrodes. And the coordinate calculation step includes receiving a delay difference, calculating a coordinate of the first to fourth electrodes and the touch position, respectively, calculating the touch position. In another embodiment of the method of the present invention, the delay calculating step includes measuring and outputting a delay difference at the time as the first delay difference when the sampling clock signal is applied to the first electrode . When the sampling clock signal is applied to the second electrode, the delay difference at this time is measured and output as the second delay difference. When the sampling is applied to the third electrode, the difference in delay at this time is measured and output as the third delay difference. When the sampling pulse signal is applied to the fourth electrode, the amount 17 201023019 /pil is measured and the delay difference at this time is output as the fourth delay difference. f The green (4) - the actual closing towel, the calculation step of the upper receiving coordinates includes the following steps. Difference calculation step: calculating a plurality of differences between the first to the fourth delay differences. The ratio calculation step divides the plurality of differences by two to calculate a plurality of ratios between the plurality of differences. The impedance calculation step: using the plurality of ratios to calculate an impedance between the first to fourth electrodes and the touch position, respectively. And, a coordinate value calculation step of: calculating the coordinates of the touch position using the plurality of impedances.

Based on the above, the input device of the present invention and its method of calculating the touch position can reduce power consumption and have a resistive touch panel that can be operated at high speed. The above described features and advantages of the present invention will become more apparent from the description of the appended claims. [Embodiment] Hereinafter, exemplary embodiments of the present invention will be described in detail. However, the present invention is not limited to the following exemplary embodiments, but can be implemented in various forms. The following description of the exemplary embodiments is provided to enable those skilled in the art to practice the invention. FIG. 3 illustrates the composition of an output device having a resistive touch panel according to an exemplary embodiment of the present invention. The input device includes a touch panel 10, a first switch 51, a second switch 52, a sampling clock signal generator 60, a delay measuring device 70, a coordinate calculator 80, and a delay element 90. The touch panel 10 includes an upper sheet mat 11 and a lower sheet mat 12. Both ends of the upper sheet mat 11 have a first electrode 111 and a second electrode 112 in a first direction 'e.g., an X-axis direction. 18 201023019 u x UT / yi.1 The lower layer sheet potential 12 has a third electrode 121 and a fourth electrode 122 in a second direction, for example, a y-axis direction. In addition, delay element 90 includes a capacitor C coupled between the delay node A and the ground voltage. In Fig. 3, 'Ra' denotes a first resistance connected between the first switch 51 and the sampling clock signal generator 60, and Rb denotes a second resistance connected between the second switch 52 and the delay node A. In other words, the input device having the resistive touch panel according to an exemplary embodiment of the present invention may further include a first resistor Ra and a second resistor Rb. ® The functions of the blocks shown in Figure 3 are described below. The touch panel 10 functions in the same manner as the description of the figure, please refer to the description of FIG. The sampling clock signal generator 60 generates a sampling clock signal clk and outputs it to the first switch 51 and the delay measuring unit 70. The first switch 51 sequentially applies the sampling clock signal elk output from the sampling clock signal generator 60 to the first electrode lu of the upper layer pad n and the third electrode 121 of the lower layer pad 12. ❿ When the first switch 51 applies the sampling pulse signal cik to the first electrode 111 of the upper sheet stack 11, the second switch 52 sequentially connects the second electrode 121 and the fourth electrode 122 of the lower sheet mat 12 with the delay node A. Make a connection. When the first switch 51 applies the sampling pulse signal cik to the third electrode 121 of the lower layer pad 12, the second switch 52 sequentially connects the first electrode 111 and the second electrode 112 of the upper layer pad u with the delay node A. connection. Here, when the first switch 51 applies the sampling pulse signal cik to the first electrode 111 of the upper layer pad 11, the second switch 52 can further connect the second electrode 112 of the upper layer 2010230i? pad 11 with the delay node. A is connected. When the first switch 51 applies the sampling pulse signal elk to the third electrode 121 of the lower sheet pad 12, the second switch 52 further connects the fourth electrode 122 of the lower layer pad 12 with the delay node A. The operation of the second switch 52 to connect the second electrode 112 or the fourth electrode 122 to the delay node A can be implemented when the touch panel 10 is not touched by an object. Delay element 90 delays signal dk_d of delay node a. As described above, the delay element 90 can include a capacitor c coupled between the delay node A and the ground voltage. In this example, the signal of the delay node A is also _4 is the capacitance of the _ capacitor c and the electrode of the sampling pulse signal clk (ie, the first electrode 111 or the third electrode 121) is applied by the first switch 51. The impedance between the electrode connected to the delay node A (i.e., the third electrode 121 or the fourth electrode 122, or the first electrode 111 or the second electrode 112) is delayed by the second switch 52. In other words, the delay of the signal clk_d corresponding to the delayed node A of the sampling clock signal elk is determined by the capacitance of the capacitor c and the sum of the following two impedances: that is, the electrode of the pulse signal elk is sampled. The impedance between the touched position, the touch position and the impedance between the electrodes connected to the delay node A. The delay detector 70 receives the sampling clock signal elk output by the sampling clock signal generator 60 and the signal clk_d of the delay node a, and measures and outputs a delay between the sampling clock signal elk and the signal clk__d of the delay node A. Difference td. As described above, the signal clk__d of the delay node A is the impedance of the touch panel that changes the clock signal elk of the self-sampling clock signal generator 60 via the first resistor Ra according to the touch position, 20 201023019 JX VJ- T / jJil The second resistor Rb and the capacitor c are delayed for a certain period of time. Since the impedances of the first resistor Ra and the second resistor Rb and the capacitance of the capacitor c are fixed, the signal dk_ of the node A is delayed (the K delay is determined by the impedance of the touch panel 10 that varies according to the touch position). The coordinate calculator 80 receives the delay difference td of the output of the delay measurer 70 and calculates and outputs the coordinates of the touch position. As described above, the input device according to an exemplary embodiment of the present invention may further include Φ the first resistor Ra and the first The second resistor Rb. When an object touches an edge of the touch panel 10, the impedance of the touch panel 10 is zero, that is, the impedance between the first switch 51 and the second switch 52 is 〇. In this example, The sampling clock signal elk is applied to the delay node A without impedance, so that the input device functions abnormally. In order to avoid the function abnormality, the input device according to the exemplary embodiment of the present invention may further include the first resistor Ra and the second resistor Rb. Although not shown in the drawings, the position of the upper sheet mat 11 and the lower sheet mat 12 may be interchanged in the input device according to the exemplary embodiment of the present invention. FIG. 4 is an equivalent circuit diagram for explaining image 3 The operation of the input device according to the exemplary embodiment of the present invention. In FIG. 4, τ represents a touch position, R1A represents an equivalent impedance between the first electrode in and the touch position τ of the upper sheet stack 11, and R1B represents The equivalent impedance between the second electrode 112 of the upper layer pad u and the touch position T, the equivalent impedance between the fourth electrode 122 and the touch position τ of the lower layer sheet 12 and the lower layer sheet pad The equivalent impedance between the third electrode 121 of 12 and the touch position τ. 21 201023019 J 10*T /pil As shown in FIG. 4, the delay detector 7A may include a delay pulse output unit 71 and a comparator 72. The delay pulse output unit 71 receives the signal cik_d of the delay node a and the signal elk_d of the delay node A (for example, delays the voltage level of the node a) to generate the pulse signal pclk__d and outputs the pulse signal pclk_d. Here, the difference in delay between the sampling clock signal elk and the pulse signal pclk_d is equal to the difference in delay between the sampling clock signal elk and the signal clk_d of the delay node A. In addition, the reference level of the delay pulse output unit 71 means delay The output of the output pulse signal © pclk-d can be fixed to a specific value. Here, the delay difference can be an impedance (that is, the first resistance Ra, the second resistance Rb, and the touch position. The comparator 72 receives the pulse signal pclk_d output by the delay pulse output unit 71 and the sampling of the output of the sampling clock signal generator 70. The clock signal clk, and calculates and outputs the delay difference between the pulse signal pclk_d and the sampling clock signal elk. Here, the noise filtering procedure can be added to the program for calculating the delay difference td. Referring to Figures 3 and 4', an input device of an exemplary embodiment of the present invention will be described in detail below. First, the first switch 51 is connected to the a point, so that the sampling clock signal clk is applied to the first electrode 111, and the second switch 52 is sequentially connected to the b point and the d point, so that the third electrode 121 and the fourth electrode 122 are sequentially arranged. Connected to the delay node a. In each of the above cases, the delay difference td between the sampling clock signal elk and the delay node a 22 201023019 J χοτ/pif number clk_d, that is, the delay between the sampling clock signal clk and the round pulse signal pclk-d The difference is measured by the delay measurer and output to the coordinate calculator 8〇. Then, the first switch 51 is connected to the b point, so that the sampling clock signal clk is applied to the third electrode 121, and the second switch 52 sequentially connects the a point and the ^ point, so that the first electrode ηι and the second electrode 112 are sequentially Connect with the delay node A. In the above cases, the delay difference between the sampling clock signal clk and the signal dk_d of the delay node A is different, td, that is, the delay of the sampling clock signal clk and the output pulse signals pclk, dq is also the delay amount. The measuring device 7 is measured and turned out to the 'calculator 80'. The above operation is performed when the touch position is in contact with the object. Next, the first switch 51 is connected to point a such that the sampling clock signal clk is applied to the first electrode 1U' and the second switch 52 is connected to the point so that the second electrode 1 = is connected to the delay node a. Then, the first switch 51 is connected to point b such that the sampling clock signal clk is applied to the third electrode 121, and the second switch 52 is connected to the point d such that the fourth electrode 122 is connected to the delay node a. In the above cases, the delay difference td between the sampling clock signal dk and the signal ❹clk-d of the delay node A means that the delay difference between the sampling clock signal and the output pulse signal pclk-d is caused by the delay amount. The amount of the detector 70 is measured and output to the coordinate calculation ^ 8G. The above operation is performed when there is no object contact at the touched position. Moreover, the above operations can be performed in a different order. The coordinate calculation H 8G uses the reception delay difference td to calculate the impedances R1A R^B, R2A, and R2B, and then calculates the coordinates of the touch position. Suppose that the delay between the sampling clock signal elk and the signal dk d of the delay node a is obtained when the first switch 51 is connected to the & point and the second switch 52 is connected to b point 23 201023019 j 1 on / uii (ie The difference between the delay between the travel signal clk and the output during sampling is the first delay difference t1. When the 51st connection a is connected and the second switch 52 is connected to the d point, the obtained sampling clock signal clk and the delay node A signal elk are obtained. The difference in delay between —d is the second delay difference t2. When the first switch 51 is connected to point b and the second switch u is connected to point a, the obtained sampling clock signal elk is delayed between the signal elk and the delay node A. The delay difference is the third delay difference t3, when the first opening ^ is connected to the point b and the second switch 52 is connected to the point c, the delay difference between the obtained signal timing ek and the delayed node eight signal dk_d is obtained. The fourth delay difference t4, when the first switch 51 is connected to the point a and the second switch is connected to the point, the delay difference between the obtained sampling clock signal dk and the signal dkd of the delay node a is the fifth delay difference t5. And when the first switch is connected to point b and the second switch 52 is connected to point d. Obtaining a delay time difference ^ between the sampling clock signal elk node with a delay of the sixth signal delay difference dk_d t6. The first to sixth delay differences t1 to t6 measured by the delay measurer 70 can be determined by the following formula, where C represents the capacitance of the capacitance ^, and Ra, Rb, R1A, RIB, R2A, and R2B represent electricity.阻抗Ra and Rb impedance and impedance R1A, RIB, R2A and R2B : , 11 =Cx(Ra+Rl A+R2B+Rb) t2=Cx(Ra+RlA+R2A+Rb) t3=Cx(Ra+R2B+ R 1 A+Rb) t4=Cx(Ra+R2B+R 1 B+Rb) t5=Cx(Ra+R 1A+R1 B+Rb) 24 201023019 •JL OT / plf t6=Cx(Ra+R2A+R2B +Rb) The coordinate calculator 80 receives the first to sixth delay differences t1 to t6 and calculates the impedances Ra, Rb, R1A, RIB, R2A, and R2B. The impedances Ra, Rb, R1A, RIB, R2A, and R2B can be calculated by the following formula. More specifically, the coordinate calculator 80 first subtracts the second delay difference t2 from the first delay difference t1 to calculate a difference (tl-t2), and subtracts the fourth delay difference t4 from the third delay difference t3 to Calculate a difference (t3-t4). The difference calculated here can be expressed by the following formula: tl-t2=Cx(Ra+RlA+R2B+Rb)- Cx(Ra+RlA+R2A+Rb)=Cx(R2B-R2A) t3-t4=Cx(Ra +R2B+RlA+Rb)- Cx(Ra+R2B+RlB+Rb)=Cx(R1A-R1B) Next, the coordinate calculator 80 divides the difference (tl-t2) by the fifth delay difference t5 and the difference (t3) -t4) divided by the sixth delay difference 诏, thereby calculating the ratios (tl-t2)/t5 and (t3-t4)/t6. The capacitance of capacitor C can be removed by calculating the ratio. The ratios (tl-t2)/t5 and (t3-t4)/t6 can be expressed by the following formula:

Tl tl-t2_ R2B-R2A

T5 ~ Ka + RlA + RlB + Rb t3-t4_ R1A - R1B ka + R2A + R2B + Rb Next, the coordinate calculator calculates impedances R1A, R1B, R2A, and R2B by simultaneously solving the above equation. In the above formula, the impedance of the first resistor Ra and the second resistor Rb is determined at the time of design, and the sum of the impedances R1A and R1B (R1A+R1B) is the impedance of the entire upper wafer pad η and is determined by the design time, and the 'impedance R2A The sum with R2B (R2A+R2B) is the whole 25 201023019

The impedance of the Jlot/pn lower layer pad 12 is determined by the design time. Therefore, it is possible to calculate the respective impedances R1A, RIB, R2A, and R2B using the above formula and the set values at the time of design. The impedance R1A is proportional to the distance τ between the touch position τ and the left electrode of the upper sheet pad n and the impedance R2B is proportional to the distance between the touch position τ and the lower electrode of the lower sheet pad 12. Therefore, the coordinate calculator 8〇 can calculate the coordinates of the touch position from the impedances R1A, RIB, R2A, and R2B. As described above, the impedance of the first resistor Ra, the impedance at the second resistor, the sum of the impedances R1A and R1B, and the sum of the impedances R2A and R2B are determined by the design time, but the error may occur due to process or other reasons. Therefore, in the output device of the exemplary embodiment of the present invention, the above error can be corrected by the correcting operation. In the output device of the exemplary embodiment of the present invention, the first resistor Ra and the second resistor Rb may be fabricated using an indium tin oxide (ITO) film such as an upper layer pad u and a lower layer pad, such that the impedance change according to temperature is It is eliminated in the formula. When the first to fourth delay differences t1 to t4 are specific values or exceed the specific value, the coordinate calculator 80 may determine that the touch panel 1 is not touched. For the sake of convenience, the delay pulse output unit 71 described above does not delay the signal clk_d of the delay node A. However, the control signal 'delay pulse output unit 71 input for the reaction from the outside can delay the signal elk-d of the delay node A for a period of time and output the pulse signal pclk_d according to the control signal. The control signal can be input by the user or input by a controller (not shown) of the input device. In this case, 'the parasitic between the touch panel 1〇 and the display (not shown) placed under it is controlled by controlling the additional delay of the delay pulse output unit 2010A. Additional delays in capacitance, or the result of corrective operations, are possible. The reference level of the delayed pulse output unit 71 may be changed corresponding to the control signal input from the outside' or the delayed pulse output unit 71 may have a hysteresis characteristic. It is possible to minimize the influence of the _ noise generated on the delay node A when the reference level is changed or the delayed pulse output unit 71 has a hysteresis characteristic. Figure 5 illustrates the composition of an input device having a resistive touch panel in accordance with another exemplary embodiment of the present invention. The input device includes a touch panel 13, a first switch 53, a sampling clock signal generator 60, a delay measuring device 7A, a coordinate calculator 81, and a delay element 90. The touch panel 13 includes an upper film pad 14 and a lower layer pad 15. The upper sheet pad 14 has an output electrode 141 connected to a delay node A and the output electrode 141 is formed at the edge of the upper sheet pad 14. The four corners of the lower sheet pad 15 are formed with first to fourth electrodes 151 to 154. Additionally, delay element 90 can include a capacitor c coupled between the delay node A and a ground voltage. The upper sheet pad 14 and the lower sheet pad 15 may have a square shape.输入 Although not shown in the drawings, the input device of the exemplary embodiment of the present invention in FIG. 5 may further include a first resistor connected between the first switch 53 and the sampling clock signal generator 60, and The second resistor is connected between the output electrode 141 and the delay node A. In this case, the first resistor and the second resistor may be made of the same material as the upper sheet mat 14 and the lower sheet stack 15. 27 201023019 Λ UT / pit The function description of each block shown in Figure 5 is as ^. Referring to Figure 3, the sampling clock generator 6A, the delay measuring device 70, and the delay element 90 function in the same manner as in Figure 3. In the touch panel 13, the impedance between the touch position and each electrode changes depending on the touch position. In the upper sheet 塾 14 +, the impedance between the touch position 盥 output electrode (4) changes according to the touch position, and in the lower sheet ,, the impedance between the touch position and the first to fourth electrodes (5) to 154 It varies depending on the touch position. The first switch 53 sequentially applies the sampling clock signal dk which is output from the sampling to the burners 6 151 to 1M of the lower sheet stack 15 . The first to fourth electrode coordinate calculators 81 of the & 15 receive the delay measurer 7, calculate the touch position and the lower slice 塾丨, and the respective impedances between the delay differences 151 to 154 and calculate the - to the For the four electrodes, please refer to the coordinates of the upper layer ^ as illustrated in Figure 3. The position of 15 is interchangeable. The moon pad 14 and the lower layer pad are shown in FIG. 6 to FIG. 8 . The invention of FIG. 5 _ the exemplary embodiment of the input device with the resistive touch panel, the sheet 塾 14 ' ® 7 shows the lower layer sound ° Figure 6 shows the upper layer. In FIGS. 6 and 7, T represents the touch position and FIG. 8 shows that the equivalent circuits R2T, R3T, and R4T respectively touch the 'R1T, the second electrode 152, the third electrode 153, and the first Electrode 151, effective impedance. In Fig. 8, Rs represents the equivalent impedance between the electrodes 141 between the electrodes 151, and R and the upper sheet Η Table 1 shows the impedance of the lower sheet pads 15 28 201023019 R1T to R4T one. In the impedances R1T to R4T, each impedance is proportional to the distance between the touch position τ and the corresponding one of the electrodes 151 to 154. The impedance Rs changes corresponding to the touch position T. More specifically, when the touch position τ is at the center of the touch panel 13, the impedance rs is the maximum value, and decreases as the touch position T moves toward the edge of the touch panel 13. (The impedance Rs is proportional to p(lp) when the distance from the left edge to the touch position T/the distance from the entire x-axis is p and the distance from the lower edge to the touch position 10 is T/the distance from the entire y-axis is q. ) xq〇q). As shown in FIG. 4, the delay calculator 70 of FIGS. 5 and 8 may further include a delay pulse output unit and a comparator. Referring to FIG. 5 to FIG. 8, an input device having a resistive touch panel according to another exemplary embodiment of the present invention is described in detail below. The first switch 53 sequentially applies sampling clock signals to the first to fourth electrodes 151 to 154. In each case, the delay measurer 7 measures the delay difference td between the signal elk_d of the delay node a 与 and the sampling clock signal dk, and outputs the measured delay difference td. The coordinate calculator 81 receives this delay td and calculates and outputs the coordinates of the touch position τ. As shown in Fig. 8, the signal dk_d of the delay node A is determined by the sum of the capacitance of the capacitor and one of the impedances RiT and the impedance Rs. More specifically, it is assumed that when the first switch 53 applies the pulse signal elk to the first electrode 151, the difference in delay obtained is the first delay difference 11', and the pulse signal elk is applied to the first switch 53. When the second electrode 152 is applied to the second electrode 152, the difference in delay is the second delay difference t2. When the first switch 53 29 201023019 jioH/pn applies the sampling pulse signal to the third electrode 153, the delay difference is the third. The delay difference t3' and the delay difference obtained when the first switch 53 applies the sampling pulse signal elk to the fourth electrode 154 is the fourth delay difference t4', and the first to fourth are measured by the delay measurer 70. The delay difference (1) ~ material, can be expressed by the following formula: , tl, = Cx (RlT + Rs) t2, = Cx (R2T + Rs) t3 ' = Cx (R3T + Rs) t4, = Cx (R4T + Rs) ❹ The first to fourth delay differences t1, t4 are input to the coordinate calculator 81. The coordinate calculator 81 calculates the difference between the first to fourth delay differences, divides the calculated difference by two, and then calculates the impedances R1T to R4T. The impedances R1T to R4T can be calculated by the following formula. More specifically, the coordinate measurer 81 calculates the difference value using the first to fourth delay differences t1, tt4 of the input, (tl, _t2,), (ti, _t3,), (11'44') , 〇 2'43'), 〇 2'44') and (〇'_料,). The calculated difference values, (tl -t2,), '), (tl'-t4'), (t2'-t3,), (t2, -t4,), and (t3, -t4,), _ can be The following public expressions are shown: tl'-t2'=Cx(RlT+Rs)-Cx(R2T+Rs)=Cx(RlT-R2T) tl,-t3,=Cx(RlT+Rs)-Cx(R3T+Rs) =Cx(RlT-R3T) 119 -t45 =C x (R1 T+Rs)-C x (R4T+Rs)=C x (R1T-R4T) t2 ' -t3 '=C x (R2T+Rs)-C x (R3 T+Rs)=C x (R2T-R3 T) t2,-t4,=Cx(R2T+Rs)-Cx(R4T+Rs)=Cx(R2T-R4T) t3,-t4,=Cx( R3T+Rs)-Cx(R4T+Rs)=Cx(R3T-R4T) 30 201023019 U 1 f Then the 'coordinate calculator 81 will make the difference' (tl, _t3,), (tl, _t4,), (t2' -t3'), (t2'-t4') and (t3'-t4'), divided by the difference (ti, _t2,), to calculate the ratio of the differences, ((tr_t3,) / (tr_t2, )), ((tl'-t4')/(tl'-t2')), ((t2'-t3')/(tl,_t2,)), ((t2,-t4,)/(tl, -t2,)) and ((〖344')/〇1'42')). In other words, the coordinate calculator 81 can be obtained by taking the difference values, (tl'-t2,), (tl'-t3,)' (tl, -t4,), (t2, -t3,), (t2, -t4,) and (t3 _t4') divide the two phases to eliminate the capacitance of the capacitor c. The above ratio can be expressed by the following formula: (tl, -t3,)_(RlT-R3T) (tl, -t4,)_(RlT-R4T) (R1T-R2T) (t2, -t3,)_(R2T —R3T) WT=t2i)-(RlT-R2T) (12Μ4,) —(R2T-R4T) ^i7=:t27)'"(RlT-R2T) (e,-t4,)_(R3T-R4T) (tr-t2') One (R1T - R2T) o Next, the coordinate calculator 81 calculates the impedances R1T to R4T' by simultaneously solving the above formula and calculates the coordinates of the touch position T from the impedances R1T to R4T. The coordinates of the touch position τ can be calculated from only three of the impedances R1T to R4T. However, in another exemplary embodiment of the present invention, the impedances R1T to R4T are all calculated such that the influence of temperature or the like (impedance is changed) can be eliminated by using the ratio of the impedances R1T to R4T. Further, when the first to fourth delay differences t1, t4' are specific values or exceed the specific value of 31 201023019 χ t yxx , the coordinate calculator 81 determines that the touch panel 13 is not touched. Figure 9 is a diagram showing the composition of an input device having a resistive touch panel in accordance with another exemplary embodiment of the present invention. The input device includes a touch panel 16, a first switch 57, a second switch 58, a sampling clock signal generator 60, a delay measuring device 70, and a coordinate calculator 82. The touch panel 16 includes an upper film pad 17 and a lower layer pad 18. 10 and FIG. 11 illustrate an exemplary embodiment of the top sheet pad 17 and the lower sheet pad 18 of the touch panel 16 in accordance with the input device of the other exemplary embodiment of the present invention. As shown in FIG. 10 and FIG. 11 , the input device upper layer pad of the exemplary embodiment of the present invention has a plurality of first touch panels Pyl, Py2, . . . , which extend in the X-axis direction and are disposed. In the y-axis direction. The lower sheet pad 18 has a plurality of second touch panels Ρχΐ, ρΧ2··_, which extend in the y-axis direction and are placed in the X-axis direction. The figure shows that the layer sheet pad 17 has 12 first touch panels Py py2... and the lower layer sheet pad 18 has 15 second touch panels ρχ1, Ρχ2.... However, the number of the first touch panel and the first touch panel provided by the upper sheet mat π and the lower sheet mat 18 may be respectively determined as needed. For example, the upper sheet cushion 17 may have only one first touch panel, and the layer stack 18 may have two or more second touch panels. Referring to Figures 9 through 11, the functional details of the blocks shown in Figure 9 are the same as those described in Figure 3 for sampling pulse signal generator 60 and delay measuring device 7'. Please refer to Figure 3. In addition, as shown in FIG. 4, the measuring unit 70 may include a delay pulse wheeling unit 71 and the comparator is delayed. 32 201023019 ^ ί or /pif The first switch 57 outputs the sampling clock signal of the sampling clock signal generator 6〇. The elk sequentially applies a plurality of left side electrodes μ; an of the upper sheet mat 17 and a plurality of lower side electrodes bl: bm of the lower sheet mat 18. When the first switch 57 applies the sampling clock signal clk to one of the left side electrodes a1:an of the upper sheet mat 17, the second switch 58 sets the plurality of upper electrodes dl:dm and the lower electrode bl of the lower sheet mat 18: Bm is connected to the delay node A in sequence. When the first switch 58 applies the sampling clock signal clk to one of the lower side electrodes bl: bm of the upper layer 塾 sheet 塾 17, the second switch 58 sets the left side electrode ai: an of the upper sheet 塾 17 and the right side electrode: (3) Connect to the delay node A in sequence. Referring to Figures 9 through 11', an input device having a resistive touch panel according to another exemplary embodiment of the present invention will be described in detail below. First, the first switch 57 applies the sampling clock signal Clk to the left electrode a1 of the upper layer pad an: an first electrode ai thereof, and the second switch 58 sets the upper electrode dl of the lower layer pad 18 to the lower electrode dl: dm The side electrodes bl: bm are sequentially connected to the delay node A. The delay measurer 70 measures the delay difference td in each case Φ and the delay difference td measured by the output amount to the coordinate calculator 82. The coordinate calculator 82 uses the input delay difference td to calculate the impedance, and uses the calculated impedance to calculate the coordinates of a touch position. Referring to the description of Figs. 3 and 4, the process of calculating the impedance using the delay difference td and calculating the coordinates of the touch position using the calculated impedance can be easily understood. The above process will continue until the first switch 57 applies the sampling clock signal elk to the left electrode a1 of the upper sheet stack 17 to the last electrode an. 33 201023019

JlO'T/pil then 'the first switch 57 applies the sampling clock signal clk to the lower electrode bl of the lower layer 塾18, the first electrode bl' of the bottom layer bl:bm, and the second switch 58 sets the left side of the upper wafer pad 17 Electrode a1: an and right electrode cl:

Cn is sequentially connected to the delay node A. The delay measurer 70 measures and outputs the delay difference t under each 兄i brother (the coordinate calculator 82 uses this delay difference td to calculate the impedance' and uses this delay difference td to calculate the coordinates of the touch position. It will repeat until the first opening 57 applies the sampling clock signal elk to the lower electrode bl of the lower sheet pad 18: the last electrode bm is formed therein. @ As described above, the delay difference td is a specific value or larger. At a specific value, the coordinate calculator 82 determines that the touch panel 16 is not touched. In the input device having the resistive touch panel of the other embodiment of the present invention shown in FIGS. 9 to 9, the upper layer pad 17 and/or Or the lower layer pad 18 has a plurality of touch pads, so that it is possible to simultaneously detect two or more touch positions in the touch panel 16. For example, the upper layer pad has a touch pad and the lower layer When the sheet pad 18 has two touch panels, the input device can simultaneously detect two touch positions, and when the upper sheet cassette 17 and the lower sheet sheet 18 each have two touch panels, the input device can simultaneously Detect four touch positions. Therefore, the input device with the resistive touch panel of the other embodiment of the present invention can reduce power consumption and detect a touch position at high speed. In addition, the input device can simultaneously detect two or more touches. Figure 12 is a diagram showing the input device of the resistive touch panel of Figure 3, Figure 5 and Figure 9 with its sampled clock signal generator 60 and delay measuring device 34 201023019 ^ wr/pif 7〇 Exemplary Embodiments The functions of the blocks shown in Fig. 12 are as follows: The sampling clock signal generator 65 can change the pulse width of the sampling clock signal elk according to the control code code output from the delay measuring device 75, and rotate the sampling. Clock signal elk.

延迟 Delay detector 75 receives a signal dk-d of delay node A, and determines whether the sample clock signal elk is transmitted to delay detector 75 via delay node a. The delay detector 75 changes the control code code according to the result of the decision and outputs a delay difference td corresponding to the control code code. The signal detector 76 of the delay detector 75 can receive the signal clk_d of the delay node a, determine whether the sample clock signal elk is transmitted via the delay node A, and output a detection signal det according to the determined result. The controller 77 of the delay measurer 75 can change the control code code according to the detection signal det and output the delay difference td. More specifically, the controller 77 can change the control code c〇de until the detection signal det indicates whether the sampling clock signal dk transmitted via the delay node A is received, according to the sampling clock signal elk via the delay node. A is transmitted by the threshold to detect the control code code and output the delay difference according to the control code code corresponding to the threshold. I η When using the sampling clock signal generator 65 and the delay measuring device 75 of another exemplary embodiment as shown in Fig. 12, the operation of the input device of another exemplary embodiment of the present invention will be described below. As described above, the sampling clock signal generator 65 can change the pulse width of the sampled clock signal dk that is rotated according to the control code. In other words 35 201023019, the sampling clock signal elk has a pulse width corresponding to the control code c〇de. The sampling clock signal elk is input to the delay measuring device 75 via the touch panel 1 (13 or 16) and the delay node A. The sampling clock signal dk is input to the delay measuring device 75 in the form of a clock signal, which is a pulse width of the sampling clock signal elk, an impedance of the touch panel according to the touch position, and a delay element 90 (for example, a capacitor) The capacity of c) is determined. Here, the capacitance of the delay element 90 is fixed' and the impedance of the touch panel 1 is determined according to the touch position. Therefore, whether the sampling clock signal elk is input to the delay measuring device 75 in the form of a clock signal is determined by the pulse width of the sampling clock signal elk. When the pulse width of the sampling clock signal elk is greater than or equal to a threshold value, the sampling clock signal elk is transmitted to the delay measuring device 75 via the delay node A in the form of a clock signal. On the other hand, when the pulse width of the sampling clock signal cik is less than the threshold value, the sampling clock signal dk is not transmitted in the form of a clock signal due to the impedance of the touch panel 10 and the distortion caused by the delay element 90. In other words, the signal detector of the delay detector 75 cannot detect the clock signal. The threshold value corresponds to the impedance of the touch panel according to the touch position change, that is, the delay difference between the sampling clock signal Clk and the signal clk_d of the delay node A. The signal detector 76 determines whether the sampling clock signal elk is transmitted in the form of a clock signal via the delay node A and outputs the signal tet according to the determined result. When the control code code is changed according to the detection signal det, the control 36 201023019 UT UT / 77 detects the threshold value and outputs a delay difference td corresponding to the control code (7), wherein the control code c〇de The pulse width of the sampling clock signal clk is taken as the threshold value. When the controller 77 changes the control code c〇de such that the pulse width of the sampling clock signal elk gradually decreases from the maximum value or the specific value, the threshold value is detected, and the control code code is changed to sample the clock signal elk. When the pulse width gradually increases from the minimum or a specific value, the threshold is detected or a successive approximation is used to detect the threshold. After that, the embodiment of calculating the coordinates of the touch position can be implemented in the same manner with reference to the description of FIGS. 3 to 8.

More specifically, when the sampling clock signal generator 65 and the delay measuring device 75 of the other embodiment shown in FIG. 12 are used, the pulse width of the sampling clock signal dk is changed to measure the sampling clock signal clk and The delay difference between the signal elk-d of the node A is delayed, and the delay difference is used to calculate the impedance of the touch panel 10 according to the touch position, so that the coordinates of the touch position can be calculated. In summary, the input device having the resistive touch surface of the exemplary embodiment of the present invention and the method for calculating the touch position of the input device can achieve reduction in power consumption and high speed operation. The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art can make a few changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a combination of a conventional input device having a resistive touch panel, 37 201023019 jXO*t/yil. For explaining the conventional input device of Fig. 1, Fig. 2 is the operation of the equivalent circuit diagram. (9) ^^ The composition of the wheel-out device having the resistive touch panel according to the exemplary embodiment of the present invention. The μ^4疋-equivalent circuit diagram' is used to illustrate the operation of the wheeling device of the exemplary embodiment of the present invention. Figure 5 illustrates the composition of an input device having a resistive touch panel of another exemplary embodiment of the present invention. FIG. 6 illustrates the operation of the input device of the input device of FIG. 5 in accordance with another exemplary embodiment of the present invention with a resistive touch panel. FIG. 7 illustrates the operation of the input device of FIG. 5 in accordance with another exemplary embodiment of the present invention with an input device underlying lamella pad having a resistive touch panel. Figure 8 is an equivalent circuit diagram for explaining the operation of the input device of Figure 5 in accordance with another exemplary embodiment of the present invention. ❹ Figure 9 illustrates the composition of an input device having a resistive touch panel in accordance with another exemplary embodiment of the present invention. 10 and FIG. 11 respectively illustrate an upper layer of a touch panel and a lower layer of the touch panel of the input device of FIG. 9 according to another exemplary embodiment of the present invention. 12 illustrates an exemplary embodiment of the input device with the resistive touch panel of FIG. 3, FIG. 5, and FIG. 9 sampling the clock signal generator and the delay detector 38 201023019 ^x or /px/ . [Main component symbol description] 10, 13, 16: touch panel 1 Bu 14, 17: upper foil pad U1, 112, 12 122, 15 152, 153, 154, al~an, cl~cn, bl~ Bm, dl~dm: electrodes 15, 18: lower sheet mat 141: output electrodes 21, 51, 53, 57: first switch 22' 52, 58 · second switch 23: third switch 3 〇: power supply 40 = voltage measuring device T · touch position R1A, RIB, R2A, R2B, R1T, R2T, R3T, R4T, RiT, Rs: equivalent impedance 60, 65: sampling clock signal generator 70, 75: delay Measurer 71 · Delay pulse output unit 72: Comparator 76: Signal detector T7: Controller 80, 81, 82: Coordinate calculator 90: Delay element 39 201023019 J io*t /pix

Ra, Rb: resistance C: capacitance elk: sampling clock signal clk_d: delay node signal td: delay difference pclk_d: pulse signal CV: coordinate A: delay node

Pyl, Py2···, Ρχΐ, Ρχ2·": touchpad det: detection signal code : control code

40

Claims (1)

201023019 ^ XOT / JJlf VII. Application for patents: L An input device comprising: a touch panel having a plurality of electrodes, wherein the impedance between each electrode and the touch position varies according to the touch position; Taking a clock signal generator for outputting a sampling clock signal; a switch for sequentially applying the sampling clock signal to a portion of the electrodes; Φ and a delay element for delaying a delay node a delay node connecting at least one of the electrodes; a delay measuring device for measuring and outputting a delay difference between the signal of the delay node and the sampling clock signal; and a calibration calculator And receiving a delay difference of the delay detector output and calculating a coordinate of the touch position. 2. The input device of claim 1, wherein the delay element comprises a capacitor connected between the delay node and a ground voltage, the signal of the delay node being impedanced by the touch panel The electrical capacity of the capacitor is delayed by 'the impedance is the impedance between the electrode to which the sampling pulse signal is applied and the electrode to which the delay node is connected. 3. The input device of claim 1, wherein the delay measuring device comprises: a delay pulse output unit for detecting a level of the signal of the delay node and outputting a pulse signal; and a comparator for receiving the pulse signal and the sampling clock signal, measuring a delay difference between the pulse signal and the sampling clock signal, and 201023019 J JlOt/pti outputting the delay difference as the signal of the delay node The difference between the delay and the sampling of the sampling signal. 4. The input device of claim i, wherein the delay measuring device comprises: a signal detector for determining whether the sampling clock signal is Inputting to the delay detector through the delay node, and outputting a detection signal according to the determined result; and a controller for changing a control code according to the detection signal until one of the sampling clock signals The pulse width becomes a threshold value, and a delay difference is output according to the control code when the pulse width of the sampling pulse signal becomes the threshold value. Delay difference between the nodes delay the clock signal when the sample number for inquiry, wherein when the sampling clock signal generator according to the control code to change the pulse width of the output sampling clock signal. 5. The input device of claim 1, wherein the touch panel comprises: a first wafer pad having a first electrode and a second electrode, the first sheet being placed in a 10th direction And a second wafer pad having a third electrode and a fourth electrode disposed at opposite ends of the second wafer pad in a second direction perpendicular to the first direction. 6. The input device of claim 5, further comprising a second switch, wherein when the first switch applies the sampling pulse signal to the first electrode, the second switch sequentially The third electrode and the fourth electrode are connected to the delay node, and when the first switch applies the sampling clock signal to the 42th 201023019 χ «j-γ / three electrodes, the second switch sequentially An electrode and the second electrode are connected to the delay node, wherein the first switch sequentially applies the sampling clock signal to the first electrode and the third electrode. 7. The input device of claim 6, wherein the second switch, when the first switch applies the sampling pulse signal to the first electrode, additionally using the second electrode and the delay node For connection, when the first switch applies the sampling clock signal to the third electrode, the fourth electrode is further connected to the delay node. 8. The input device of claim 7, wherein the second switch further connects the second electrode or the fourth electrode to the delay node when the touch panel is not touched. 9. The input device of claim 7, wherein the delay detector 'the pulse is given to the first electrode when the first switch is applied and the third electrode is connected to the third electrode When the node is delayed, the delay difference at this time is measured and output to the coordinate meter as a first delay difference. The pulse is given to the first electrode and the second is applied to the first switch. When the switch connects the fourth electrode and the delay node, measuring the difference in delay at this time and outputting to the coordinate calculator as a second delay difference, and applying the sampling clock signal to the third switch at the first switch And measuring the delay difference at the time when the first switch is connected to the first electrode and the delay node, and outputting to the coordinate calculator as a third delay difference, applying the sampling clock to the first switch When the signal is applied to the third electrode and the second switch is connected to the second electrode and the delay node, the delay difference 43 201023019 X \j−I / is measured at this time and is output to the coordinate as a fourth delay difference. Calculation And when the first switch applies the sampling clock signal to the first electrode and the second switch connects the second electrode to the delay node, measuring a delay difference at this time and outputting as a fifth delay difference When the first switch applies the sampling clock signal to the third electrode and the second switch connects the fourth electrode to the delay node, measuring the delay difference at this time and as a first The six delay differences are output to the coordinate calculator. 10. The input device of claim 9, wherein the delay measuring device measures and outputs the fifth Θ and the sixth delay difference when the touch panel is not touched. 11. The input device of claim 9, wherein the coordinate calculator receives the first to the sixth delay difference, and calculates an impedance between each of the first to fourth electrodes and the touch position And calculate the coordinates of the touch location. 12. The input device of claim 5, wherein the coordinate calculator calculates a first difference between the first delay difference and the second delay difference, and the third delay difference and the fourth A second difference between the delay differences is respectively divided by the first difference and the second difference by the fifth and the sixth delay difference' and the impedances are calculated. 13. The input device of claim 9, wherein the coordinate calculator determines that the touch panel is not touched when the first to the fourth delay difference is a specific value or exceeds the specific value. . 14. The input device as claimed in claim 6, further comprising: a first resistor s connected between the first switch and the sampling clock signal 44 201023019 WAW f A burner; A second resistor is coupled between the second switch and the delay node. The input device of claim 14, wherein the material of the first and second resistors is the same as the first and second sheet pads. The input device of claim 1, wherein the touch panel comprises: a quadrangular first wafer pad having an output electrode formed on an edge of the ❹-shaped quadrangle pad; and a The quadrangular second wafer pad has first to fourth electrodes formed at four corners of the quadrangular second foil pad, wherein the wheel electrode is connected to the delay node. The input device of claim 16, wherein the first switch sequentially applies the sampling clock signal to the first to the fourth electrodes. 18. The input device of claim 2, wherein the %#detector' measures a delay difference when the first switch applies the sampling pulse signal to the first electrode and acts as a a first delay difference is output to the coordinate calculator ′ to measure a delay difference when the first switch applies the sampling clock signal to the second electrode, and output to the coordinate calculator as a second delay difference, Measuring a delay difference when the first switch applies the sampling clock signal to the third electrode and rotating to the coordinate calculator as a third delay difference, and measuring the sampling at the first switch The delay difference of the clock signal to the fourth electrode is rotated to the coordinate calculator as a fourth delay difference. w 45 201023019 x wr I ^/xx 19. The input device according to claim 18, wherein the coordinate calculator receives the first to the fourth delay difference, and calculates the first to the fourth electrode respectively The impedance between the touched position and the coordinates of the touched position are calculated. 20. The input device of claim 19, wherein the coordinate calculator calculates a difference between the first to the fourth delay differences, divides the calculated differences by two, and calculates the impedances . 21. The input device of claim 18, wherein the coordinate calculator determines that the touch panel is not touched when the first to fourth delay differences are a specific value or exceeds the specific value of the parameter . 22. The input device of claim 17, further comprising: a first resistor 'connected between the first switch and the sampling clock signal generator; and a second resistor coupled to the first The second switch is between the delay node. The input device of claim 22, wherein the material of the first and second resistors is the same as the first and second sheet pads. The input device of claim 2, wherein the touch panel comprises: a first wafer pad having a plurality of first touch panels extending in a first direction, the first touches The board is placed in a second direction perpendicular to the first direction, each of the first touch panels is connected to a corresponding one of the electrodes; and a second wafer pad has a plurality of second extending in the second direction The touchpads are disposed in the first direction, and the second touchpads 46 4623023019 · / XU~T / MJil ends are connected to corresponding ones of the electrodes. The input device of claim 24, further comprising a second switch, wherein the first switch applies the pulse signal to the electrode connected to one of the first touch panels The second switch sequentially connects the electrodes connected to the two ends of the second touch panels to the delay node. The first switch applies the sampling clock signal to the second touch panels. When the electrode is turned on, the second switch sequentially connects the electrodes connected to the two ends of the first touch panel to the delay node, wherein the first switch sequentially applies the sampling clock. The signal is connected to an electrode at one end of the first touch panels and an electrode connected to one end of the second touch panels. 26. The wheel-in device of claim 25, wherein the delay meter measures and outputs a plurality of delay differences according to respective conditions, wherein the first switch applies the sampling clock signal to the first switch. An electrode of one of the first or second touch panels and the second switch connects the two ends of the first or second touch panel to the delay node. The coordinate calculator connects (4) some delay differences, calculates the impedance between each electrode and the touch position, and calculates the coordinates of the touch position. 28. The input device of claim 25, further comprising: the input device of claim 26, wherein: the first resistor, the live device; and the first And a second resistor connected to the first switch and the sampling clock signal is connected between the second switch and the delay node. The input device of claim 28, wherein the materials of the first and second resistors are the same as the first and second touch panels. 30. A method for calculating a touch position in an input device having a touch panel, the touch panel having a plurality of electrodes, and an impedance between each electrode and a touch position varies according to the touch position And a delay element for delaying the signal of a delay node, the method comprising: a sampling clock signal applying step, sequentially applying a sampling clock signal to the portion of the electrodes; and a delay step connecting the At least one of the electrodes is at the delay ringing node; a delay measuring step 'measuring a difference in delay between the signal of the delay node and the sampling clock signal; and a standard calculating step 'receiving the delay measuring step Delay difference, calculate the impedance between each electrode and the touch position, and calculate the coordinates of the touch position. 31. A method for calculating a touch position in an input device having a touch panel as described in claim 30, wherein the delay measurement step comprises: a delay pulse output step detecting the delay node a signal of the signal and outputting a pulse signal; and a comparing step of measuring a delay difference between the pulse signal and the sampling clock signal and outputting the delay difference as the signal of the delay node and the sampling The difference in delay between clock signals. 32. The method for calculating a touch position in an input device having a touch surface 48 201023019 A board as described in claim 30, wherein the delay measurement step comprises: a signal detection step, determining Whether the sampling clock signal is input to a delay measuring device via the delay node and outputting a detecting signal according to the determined result; and a control step of changing a control code according to the detecting signal until the sampling clock One of the pulse widths of the signal becomes a threshold value 'and when the pulse width of the pulse signal becomes the threshold value, the signal corresponding to one of the delay codes of the control code is output as the delay point and the sampling The delay difference between the clock signals, wherein the sampling clock signal applying step comprises changing the pulse width of the output sampling clock signal according to the control code. 33. A method for calculating a touch position in an input device having a touch panel as described in claim 30, wherein the touch panel has a first wafer pad, and the first wafer pad has two ends a first electrode and a second electrode are disposed in a first direction; and a second pad is disposed, and a third and a fourth electrode are disposed at opposite ends of the second wafer pad in a second direction perpendicular to the first direction The sampling clock signal applying step includes sequentially applying the sampling clock signal to the first electrode and the third electrode, and the delaying step comprises: when the sampling pulse signal is applied to the first electrode, And connecting the third electrode and the fourth electrode to the delay node, and sequentially connecting the first electrode and the second electrode to the delay node when the sampling pulse signal is applied to the third electrode. 34. The method of calculating a touch position in an input device having a touch panel as described in claim 33, wherein the delay step 49 201023019 x \jt I is further included in the sampling clock signal When the first electrode is applied, the second electrode is further connected to the delay node, and when the sampling signal is applied to the second electrode, the fourth electrode is additionally connected to the delay node. . 35. A method for calculating a touch position in an input device having a touch panel as described in claim 34, wherein the delay measuring step comprises: applying a pulse signal to the first electrode during the sampling And when the third electrode is connected to the delay node, measuring and outputting the delay difference at this time as a first delay difference, wherein the pulse signal is applied to the first electrode and the fourth electrode is connected to the delay At the time of the node, the difference between the delays at this time is measured and output as the second delay difference, and the pulse signal is applied to the second electrode when the sampling is performed and the first electrode is connected to the delay node, and the output is measured. The delay difference is a third delay difference. When the sampling signal is applied to the third electrode and the second electrode is connected to the delay node, the delay difference at the time is measured and output as a fourth delay difference. And when the sampling pulse signal is applied to the first electrode and the second electrode is connected to the delay node, measuring and rotating the delay difference at this time as a fifth delay difference, at the time of sampling When the pulse signal is applied to the third electrode and the fourth 电极 electrode is connected to the delay node, the difference in delay at this time is measured and output as a sixth delay difference. 36. The method of calculating a touch position in an input device having a touch panel according to claim 35, wherein the coordinate calculation step comprises: a difference calculation step, subtracting from the first delay difference The second delay difference is calculated by calculating a first difference, and subtracting the 50th 201023019 λ. \J~r I l/jlL· four delay difference from the third delay difference to calculate a second difference; a ratio calculation step Dividing the first difference by the fifth delay difference to calculate a first ratio, and dividing the second difference by the sixth delay difference to calculate a second ratio; an impedance calculating step of using the first and the first The second ratio is used to calculate the impedance between the first to the fourth electrodes and the touch position; and a set of value calculation steps are used to calculate the coordinates of the touch position. The method for calculating a touch position in an input device having a touch panel as described in claim 30, wherein the touch panel has a square first wafer pad, and an output electrode is formed on One side of the quadrilateral first sheet mat; and a quadrangular second sheet mat, the first to fourth electrodes are formed at four corners of the quadrangular second sheet mat, and the sampling clock signal applying step comprises sequentially sampling the strip The clock signal is applied to the first to the fourth electrodes, and the coordinate calculation step includes receiving the delay differences, calculating an impedance between the first to the fourth electrodes and the touch position, and calculating The coordinates of the touch location. 38. The method of claiming a touch position in an input device having a touch panel, wherein the delay measuring step comprises: when the sampling pulse signal is applied to the first electrode Measuring and iff delay difference at this time as a first-delay difference, when the second inflammation is applied to the second electrode at the time of sampling, and the delay difference at the output is "I ΐ-delay difference, When the sampling clock signal is applied to the third, the delay difference is measured and output as a third delay difference 51 201023019 ^ 1 U~TI, and the pulse signal is applied to the fourth electrode during the sampling. At the time of measurement, the difference in delay at this time is taken as a fourth delay difference. J 39. The method of calculating a touch position in an input device having a touch panel according to claim 38, wherein the coordinate calculation step comprises: a difference calculation step of calculating the first to the first a plurality of differences between the four delay differences; a β-ratio calculation step of dividing the differences by two to calculate a plurality of ratios between the differences; a reference impedance calculation step of calculating the ratio using the ratios First to fourth impedances of the fourth electrode and the touch position; and a set of value calculation steps for calculating the coordinates of the touch position 52