JP2007299074A - Touch position acquisition device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch position acquisition device that can accurately calculate a touch position irrespective of changes in resistance of wiring parts and implement low power consumption. <P>SOLUTION: A cellphone 1 that functions as the touch position acquisition device and comprises an analog resistive film touch panel 300 includes registers 117X, Y to 119X, Y for holing voltages at a touch position and voltages at both ends of the resistive films of the touch panel 300, LUTs 122X, Y for calculating the touch position on the touch panel 300 from the voltages held, a touch operation detection part 124 for detecting a touch operation on the touch panel 300, and a sequencer 127 and an analog switch 113 for causing the registers 117X, Y to 119X, Y to hold such voltages at the touch position of the resistive films and voltages at both ends of the resistive films measured by the touch panel 300 while the touch operation detection part 124 detects a touch operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a touch position acquisition device, and more particularly to improvement in accuracy of touch position calculation in an analog resistive touch panel.

  The analog resistive film type touch panel includes two resistive films for X-axis position detection and Y-axis position detection, and detects a touch position for each of the X-axis and Y-axis by resistance division of the resistive film. Hereinafter, description will be given with reference to the drawings.

FIG. 6 is a diagram showing an equivalent circuit for the X-axis position detection circuit or the Y-axis position detection circuit of the ideal analog resistive touch panel 1000. As shown in the figure, the touch panel 1000 is provided with a resistance film (resistance R _T ) from one end to the other end, and a DC voltage V _D is applied to the resistance film _RT . The touch panel 1000 is configured to acquire the voltage V applied to the pressed position when the touch surface is touched. Thus the acquisition voltage V, the resistance R _T1 from the ground point to the touch position (resistance division point) is calculated. Specifically, it is calculated as shown in equation (1).
R _T1 = R _T × V / V _D (1)

The touch position of the touch panel 1000 is calculated based on the resistance _RT and the resistance _RT1 thus obtained for each of the X axis and the Y axis.

The touch panel 1000 shown in FIG. 6 is ideal when the wiring portion has no electrical resistance. In reality, the wiring portion also has an electrical resistance, and its equivalent circuit is like a touch panel 1001 (FIG. 7). In this case, the resistance _RT1 is calculated as shown in Equation (2). Incidentally, V ₁ and V ₂ respectively, the voltage applied to the power source side end of the voltage and R _T resistor according to the ground side end of the R _T resistor.
R _T1 = R _T × (V−V ₁ ) / (V ₂ −V ₁ ) (2)

Thus, in practice, the resistor _{R T1} is calculated from the voltage across the resistive film _{(V 1} and _{V 2).}

Incidentally, the resistances R ₁ and R ₂ of the wiring portion shown in FIG. 7 vary depending on the use environment and the years of use. When this change occurs, the voltage applied across the resistance film also changes. Therefore, the voltages (V ₁ and V ₂ ) applied to both ends of the resistance film when the power is turned on, reset, when the stop mode is released, and when there is no touch operation such as when there is no touch input or command transmission for 30 seconds. Is measured and stored, and is used for the calculation of Expression (2) when a touch operation is performed.

Furthermore, the technique described in Patent Document 1 detects the presence or absence of a touch operation periodically (at intervals of 50 ms), measures and stores the voltage applied to both ends of the resistive film when not touched, and performs the touch operation. Is used as touch position correction data.
JP 09-160719 A

However, if the voltages (V ₁ and V ₂ ) are measured and stored at the time of power-on, reset, etc., as in the technique described in Patent Document 1, the voltage until the touch operation is performed. (V ₁ and V ₂ ) may have changed, and the touch position cannot be calculated accurately. Further, the technique described in Patent Document 1 requires a touch panel control unit that detects the presence or absence of a touch operation at short time intervals (50 ms intervals). At the time of non-touch, it is necessary to newly measure the voltage applied to both ends of the resistive film and store the correction data again. Therefore, a large amount of power is consumed for the processing. In particular, in a mobile phone using a battery as a power source, reduction of power consumption by the above processing is desired.

  Accordingly, one of the problems of the present invention is that a touch position acquisition device that includes an analog resistive film type touch panel and acquires a touched position by a touch operation can accurately determine the touch position regardless of the resistance change of the wiring portion. An object of the present invention is to provide a touch position acquisition device that can calculate and that realizes low power consumption.

  A touch position acquisition device according to the present invention for solving the above-described problem is an analog resistance film type touch panel that includes an analog resistance film type touch panel and acquires a position touched by a touch operation. A holding unit that holds a voltage applied to the touch position of the resistive film and a voltage applied to both ends thereof, and a touch position calculating unit that calculates a touch position in the analog resistive touch panel based on each voltage held by the holding unit Touch operation detecting means for detecting a touch operation on the analog resistive touch panel, measuring means for measuring a voltage applied to the touch position of the resistive film and a voltage applied to both ends of the resistive film, and the touch operation While the detection means detects the touch operation, the measurement result by the measurement means is stored in the storage. It characterized in that it comprises a measurement control means for holding the means.

  According to this, since the voltage applied to both ends of the resistance film is measured, the touch position acquisition device can accurately calculate the touch position regardless of the change in the resistance of the wiring portion, and can also detect both ends of the resistance film when necessary. Since the voltage applied to is measured, low power consumption can be realized.

  In the touch position acquisition device, the analog resistive touch panel includes two resistive films, an X-axis position detecting resistive film and a Y-axis position detecting resistive film. Holding the voltage applied to the touch position of the resistive film for detecting the X-axis position and the voltage applied to both ends thereof, the voltage applied to the touch position of the resistive film for detecting the Y-axis position and the voltage applied to both ends thereof, The measurement control means includes a voltage applied to the touch position of the resistance film for detecting the X-axis position, a voltage applied to both ends of the resistance film, and a resistance film for detecting the Y-axis position. The switching means for holding the holding means while switching the voltage applied to the touch position and the voltage applied to both ends of the resistive film at a given timing, and the touch operation detection data by the touch operation detecting means. Depending on the timing, including, a switching control means for controlling the timing of switching by the switching means, it is also possible.

  According to this, it is possible to measure the voltage applied to the X axis and the voltage applied to the Y axis while switching the measurement timing.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an appearance of a mobile phone 1 according to the present embodiment. The mobile phone 1 is a foldable mobile phone that functions as a touch position acquisition device, and includes a touch screen 10, an LCD (Liquid Crystal Display) 20, a power button 30, a selection button 31, and a scroll button 32. Composed.

  FIG. 2 is a diagram showing a system configuration of the mobile phone 1. As shown in the figure, the mobile phone 1 includes a CPU 100, a memory 101, a voice input / output unit 102, a baseband processing unit 103, an LCD control unit 104, a memory 105, a touch panel control unit 106, a memory 107, a touch screen 10, and an LCD 20 It is comprised including.

  The CPU 100 performs processing related to control and communication of each unit of the mobile phone 1. The memory 101 stores various data used for the processing of the CPU 100.

  The voice input / output unit 102 includes a microphone and a speaker, collects a voice uttered by a user, outputs the voice as an electrical signal to the CPU 100, converts the electrical signal input from the CPU 100 into a voice, and outputs the voice.

  The baseband processing unit 103 receives a radio signal from a base station apparatus (not shown), converts it to a signal having a predetermined frequency (baseband frequency), and outputs the signal to the CPU 100. Also, the signal input from CPU 100 is converted into a radio signal and transmitted to the base station apparatus.

  The touch screen 10 includes an analog resistive film type touch panel 300, and its input surface also functions as an LCD 301 which is a display device. When the user touches the input surface, the touch panel 300 outputs a voltage corresponding to the touched position to the touch panel control unit 106. The LCD 301 displays information in accordance with instructions from the LCD control unit 104.

An equivalent circuit of the touch panel 300 is the same as that of the touch panel 1001 illustrated in FIG. That is, the touch panel 300 is provided with a resistance film (resistance R _T ) from one end to the other end, and a DC voltage V _D is applied to the resistance film _RT . When the touch surface is touched, the touch panel 300 outputs a voltage V applied to the touch position to the touch panel control unit 106. Further, the touch panel 300 further outputs voltages (voltage V ₁ and voltage V ₂ ) applied to both ends of the resistance film to the touch panel control unit 106.

  The LCD 20 is also a display device that displays information in accordance with instructions from the LCD control unit 104. As described above, the touch screen 10 also includes a display device, and the mobile phone 1 includes two display devices.

  The LCD 301 and the LCD 20 include an LED (Light-Emitting Diode) 302 and an LED 200, respectively. Both the LED 302 and the LED 200 function as a backlight.

The touch panel control unit 106 controls the touch panel 300. When it is detected that a touch operation has been performed, a resistance R _T1 from the ground point to the touch position (resistance division point) is calculated from the voltage V input from the touch panel 300. Further, to obtain the voltage _{V 1} and the voltage _{V 2.} Then, a resistor _{R T,} thus a resistor _{R T1} required to calculate the voltage _{V 1} and the voltage _{V 2,} the touch position (coordinate information) on the basis of the outputs to the memory 107. The CPU 100 acquires a touch position from the memory 107 via the touch panel control unit 106, and performs processing according to the touch position. Details of the processing of the touch panel control unit 106 will be described later.

  The memory 107 stores the touch position obtained by the touch panel control unit 106.

  The LCD control unit 104 controls the LCD 301 and the LCD 20. Specifically, information input from the CPU 100 is displayed on the LCD 20 or the LCD 301. The memory 105 stores various data used for processing of the LCD control unit 104.

  Hereinafter, functions related to the operation of the mobile phone 1 by the user will be described.

  The power button 30, the selection button 31, and the scroll button 32 are operation means provided in the mobile phone 1 as hardware. On the other hand, the touch screen 10 realizes operation means by software. Hereinafter, each will be described in detail.

  The power button 30 is a push button for turning on / off the power of the mobile phone 1. When the user presses the power button 30, the power of the mobile phone 1 is switched on / off.

  The selection button 31 and the scroll button 32 are used when the user selects an object (icon, link, etc.) displayed on the LCD 20. That is, the user uses the scroll button 32 to highlight one of the one or more objects displayed on the LCD 20. When the user presses the selection button 31 while an object is highlighted, the CPU 100 starts processing corresponding to the object.

  Next, operation means realized by the touch screen 10 will be described. FIG. 1 shows an initial state of a screen displayed on the input surface of LCD 301, that is, touch panel 300. As shown in the figure, in the initial state, “drawing”, “outgoing”, “incoming”, “E-MAIL”, “0” to “9”, “*”, “#” icons are displayed on the LCD 301. Is displayed.

  When the user touches the “call” icon, the CPU 100 acquires coordinate information indicating the coordinates of the position where the “call” icon is displayed. When this coordinate information is acquired, the CPU 100 detects that the “call” icon has been touched, and starts the call process.

  At this time, the destination telephone number or the like is specified by the user touching each of the icons “0” to “9”, “*”, or “#”. Also at this time, the CPU 100 acquires coordinate information indicating the coordinates of the position where the icon touched by the user is displayed. By acquiring this coordinate information, the CPU 100 detects that each of the icons “0” to “9”, “*”, or “#” is touched.

  When the user touches the “incoming” icon, the CPU 100 acquires coordinate information indicating the coordinates of the position where the “incoming” icon is displayed. When this coordinate information is acquired, the CPU 100 detects that the “incoming” icon has been touched. When the CPU 100 detects that the “incoming” icon has been touched while receiving an incoming call, the CPU 100 starts incoming processing.

  When the user touches the “E-MAIL” icon, the CPU 100 acquires coordinate information indicating the coordinates of the position where the “E-MAIL” icon is displayed. When this coordinate information is acquired, the CPU 100 detects that the “E-MAIL” icon has been touched, and starts a predetermined process related to the e-mail.

  When the user touches the “drawing” icon, the CPU 100 acquires coordinate information indicating the coordinates of the position where the “drawing” icon is displayed. When the coordinate information is acquired, the CPU 100 detects that the “drawing” icon is touched, and the screen displayed on the LCD 301 is changed from the initial state to the “character input / drawing” screen (not shown). Transition.

  The “character input / drawing” screen has a drawing area composed of a plurality of dots. The user sequentially moves the touch position, and inputs characters and pictures using the locus. At this time, CPU100 acquires coordinate information sequentially according to each touch position, and acquires the dot touched by the user among each dot which comprises a drawing area from this coordinate information.

  The memory 101 corresponds to each dot constituting the drawing area and color information (information indicating which of the colors, such as black, white, red, yellow, blue, and transparent) the dot is. It is memorized. The CPU 100 stores the dot acquired as described above and the color specified by the user when the dot is acquired in the memory 101 in association with each other.

  Next, details of the processing of the touch panel control unit 106 will be described.

  FIG. 3 is a diagram illustrating functional blocks of the touch panel control unit 106. As shown in the figure, the touch panel control unit 106 includes an X-axis position detection voltage measurement line 111, a Y-axis position detection voltage measurement line 112, an analog switch 113, and an ADC (Analog-to-Digital Converter: AD converter). 114 to 116, registers 117X, Y to 119X, Y, subtractors 120X, Y and 121X, Y, LUT (Look Up Table) 122X, Y, oscillation unit 123, touch operation detection unit 124, logic circuit 125, A register 126X, Y and a sequencer 127 are included.

The touch panel 300 has a quadrangular input surface, and hereinafter, the direction of one side is referred to as an X-axis direction, and the direction orthogonal to the X-axis direction is referred to as a Y-axis. The touch panel 300 for each of the X-axis direction and the Y-axis direction, the user voltage corresponding to the position on the input surface touched V, the resistance R voltages V ₁ according to the ground side end of the _T, and R _T resistor power It outputs a voltage V ₂ applied to the side edges, to get.

In order to output the voltage V and the like in each of the X-axis direction and the Y-axis direction, the touch panel 300 includes two resistance films, a resistance film for detecting the X-axis position and a resistance film for detecting the Y-axis position. Have. These resistive films are arranged so as to overlap each other. Will be referred resistor R _T resistor for the resistive film for X-axis position detection R _TX, the R _T resistor for the resistive film of _Y-axis position detection and the resistor R _TY. Further, the voltage _V, V 1, _{V 2} respectively voltage _V X of the X-axis _direction, V _{1X, V 2X} and the voltage of the Y-axis direction _V, V 1, _{V 2} respectively voltages _{V Y, V 1Y,} V _2Y .

FIG. 4 is a diagram illustrating voltage signal lines provided on two resistive films of the touch panel 300. FIG. 4A shows a resistance film for detecting the X-axis position, and voltage signal lines for voltages V _X , V _1X , and V _2X are provided. These voltage signal lines correspond to the X-axis position detection voltage measurement line 111. FIG. 4B shows a resistance film for detecting the Y-axis position, and voltage signal lines for voltages V _Y , V _1Y , and V _2Y are provided. These voltage signal lines correspond to the Y-axis position detection voltage measurement line 112.

The touch panel 300 measures the voltages V _X , V _1X , V _2X , V _Y , V _1Y , V _2Y when the user touches, and measures the voltages V _X , V _1X , V _2X for X axis position detection voltage measurement. The voltages V _Y , V _1Y , and V _2Y are output to the line 111 to the Y-axis position detection voltage measurement line 112, respectively.

  The analog switch 113 is applied to the voltage applied to the touch position of the resistive film for detecting the X-axis position, the voltage applied to both ends of the resistive film, and the touch position of the resistive film for detecting the Y-axis position, which are measured by the touch panel 300. The voltage and the voltage applied to both ends of the resistance film are held in each register while being switched at a given timing.

Specifically, the analog switch 113 is connected to the X-axis position detection voltage measurement line 111 and the Y-axis position detection voltage measurement line 112, and the voltages V _X , V _1X , V _2X , V _Y , V _1Y , V Receives _2Y input. Analog switches 113, among the voltage _{V 2X} and the voltage _{V 2Y} input, internal switch 113a for selecting and outputting one among the voltage _{V 1X} and the voltage _{V 1Y} input, selects and outputs one internal switch 113b for, among voltage V _X and the voltage V _Y input, and an internal switch 113c, 3 one internal switch for selectively outputting one.

The analog switch 113 switches each of the internal switches at a given timing, the voltage V _1X and the voltage V _1Y to the ADC 115, the voltage V _2X and the voltage V _2Y to the ADC 114, and the voltage V _X and the voltage V _Y to the ADC 116. , Respectively. More specifically, the analog switch 113 switches the internal switches in accordance with a switching signal input from a sequencer 127 described later.

The ADCs 114 to 116 convert the input voltage values into digital signals and output them to registers 117X, Y to 119X, Y (described later), respectively. As a result, the register 117X, the register 117Y, the register 118X, the register 118Y, the register 119X, and the register 119Y hold digital values indicating the voltages V _2X , V _2Y , V _1X , V _1Y , V _X , and V _Y , respectively. .

  As described above, the touch panel 300 outputs each voltage at a timing according to the control by the analog switch 113. That is, the analog switch 113 holds each voltage measured by the touch panel 300 in each corresponding register while switching each voltage at a given timing.

The touch operation detection unit 124 monitors the input of the voltage V _X and the voltage V _Y from the touch panel 300, and detects that the touch operation (user instruction operation) by the user has been performed on the input surface when input. . The touch operation detection unit 124 monitors whether or not the touch operation is performed, and outputs touch operation detection information indicating that to the logic circuit 125, the sequencer 127, and the CPU 100 while the touch operation is performed.

  The oscillation unit 123 oscillates a clock signal having a predetermined period.

  The logic circuit 125 inputs a clock signal oscillated by the oscillation unit 123 to the sequencer 127 when touch operation detection information is input. On the other hand, when the touch operation detection information is not input, the clock signal oscillated by the oscillation unit 123 is not input to the sequencer 127.

  The sequencer 127 is switching control means that operates according to touch operation detection information and a clock signal. That is, the sequencer 127 outputs a switching signal to the analog switch 113 at a timing corresponding to the touch operation detection information and the clock signal, thereby switching the switching timing by the analog switch 113 according to the detection timing of the touch operation. It functions as a control means. In addition, a latch signal for instructing each register to read the timing so that each register reads a digital signal and holds a digital value according to the switching timing of the analog switch 113 according to the switching signal. Output to each register.

  The measurement timing of the touch position of the touch panel 300 and the voltage across the resistance film will be described with reference to the drawings. FIG. 5 is an explanatory diagram for explaining the measurement timing of the touch position of the touch panel 300 and the voltage across the resistance film. 5 (1) shows a period during which a touch operation is detected, FIG. 5 (2) shows a period during which the sequencer 127 is operating, and FIG. 5 (3) shows a timing at which each voltage is held in each register. Show.

As shown in FIG. 5, the sequencer 127 starts to operate when a touch operation is performed, and each register reads a digital signal indicating the voltage V _X and a digital signal indicating the voltage V _Y applied to the touch position. At the same time, the analog switch 113 and each register are controlled so that a digital signal indicating the voltage V _1X , a digital signal indicating the voltage V _1Y , a digital signal indicating the voltage V _2X, and a digital signal indicating the voltage V _2Y are read.

The sequencer 127, while the touch operation has been performed, each register, a digital signal indicating the voltage _{V X,} the digital signal indicating the voltage _{V Y,} a digital signal indicating the voltage _{V 1X,} digital signal indicating the voltage _{V 1Y,} The analog switch 113 and each register are controlled so that the digital signal indicating the voltage V _2X and the digital signal indicating the voltage V _2Y are repeatedly read into each register at a predetermined cycle (sampling cycle).

When a new digital value is held in the register 117X or the register 118X, the subtractor 120X calculates V _2X −V _{1X based} on the digital value held in the register 117X and the register 118X, and outputs it to the LUT 122X. Similarly, when a new digital value is held in the register 117Y or 118Y, the subtractor 120Y calculates V _2Y −V _{1Y based} on the digital value held in the register 117Y and the register 118Y, and outputs the result to the LUT 122Y. To do.

When a new digital value is held in the register 119X, the subtractor 121X calculates V _X -V _{1X based} on the digital value held in the register 118X and the register 119X, and outputs the calculation to the LUT 122X. Similarly, when a new digital value is held in the register 119Y, the subtractor 121Y calculates V _Y −V _{1Y based} on the digital value held in the register 118Y and the register 119Y and outputs it to the LUT 122Y.

The LUT 122X stores a reference table for calculating the following formula (3). That is, R _T1X is stored in the reference table in association with the values of α _X and β _X.
R _T1X = R _TX × α _X / β _X (3)

Similarly, the LUT 122Y stores a reference table for performing the calculation of the following formula (4). That is, R _T1Y is stored in the reference table in association with the values of α _Y and β _Y.
R _T1Y = R _TY × α _Y / β _Y (4)

The LUT 122X refers to the reference table with the value of V _2X −V _1X output from the subtractor 120X as β _X , the value of V _X −V _1X output from the subtractor 121 as α _X , and refers to the value of R _T1X . get. The LUT 122X calculates and acquires the X coordinate of the touch position based on the _RT1X thus acquired. Further, LUT122Y the value of _V 2Y _{-V 1Y} output from the subtracter 120Y beta _Y, the value of _V Y _{-V 1Y} output from the subtracter 121 with reference to the reference table as alpha _Y, the _{R T1Y} Get the value. LUT122Y is thus based on the obtained _{R T1Y,} calculates the Y coordinate of the touch position is acquired.

  The sequencer 127 outputs a latch signal indicating the timing at which the LUTs 122X and Y calculate the coordinates of the touch position to the registers 126X and Y. The register 126 </ b> X latches information indicating the X coordinate of the touch position acquired in this manner at a timing according to the instruction of the latch signal and stores the information in the memory 107. Similarly, the register 126Y latches the information indicating the Y coordinate of the touch position acquired in this way at a timing according to the instruction of the latch signal, and stores the information in the memory 107.

  The CPU 100 accesses the memory 107 via the register 126 while the touch operation detection information is input from the touch operation detection unit 124. Then, information indicating the X coordinate and Y coordinate of the touch position stored in the memory 107 is read, and predetermined processing corresponding to each acquired information is performed.

  As described above, the touch panel control unit 106 measures the voltage applied to both ends of the resistance film when the touch operation is performed and while the touch operation is performed. The touch position can be calculated accurately, and the voltage across the resistive film is measured only when necessary, so that less power is consumed.

The present invention is not limited to the above embodiment. For example, in the above embodiment, as shown in FIG. 5, the register 119X, the register 117X, the register 118X digital signal indicating the voltage _{V X} by the digital signal indicating the voltage _{V Y,} the reading of the digital signal indicating the voltage _{V 1X} At the same time, the analog switch 113 is switched to simultaneously read the digital signal indicating the voltage V _1Y , the digital signal indicating the voltage V _2X, and the digital signal indicating the voltage V _2Y by the register 119Y, the register 117Y, and the register 118Y. Although it has to show a digital signal indicating the voltage _{V X,} the digital signal indicating the voltage _{V Y,} a digital signal indicating the voltage _{V 1X,} digital signal indicating the voltage _{V 1Y,} a digital signal indicating the voltage _{V 2X,} the voltage _{V 2Y} The digital signal is read into each register one by one. Etc. constituting the log switch 113 and the sequencer 127, the voltage reading timing of each register can be appropriately changed. In the above embodiment, an example in which the present invention is applied to a mobile phone has been described. However, a battery-driven device is of course suitable as an application target of the present invention that realizes low power consumption. . In addition, the present invention can be applied to any touch position acquisition device including an analog resistive touch panel.

It is a figure which shows the external appearance of the mobile telephone which concerns on embodiment of this invention. 1 is a diagram showing a system configuration of a mobile phone according to an embodiment of the present invention. It is a figure which shows the functional block of the touchscreen control part which concerns on embodiment of this invention. It is a figure which shows each voltage signal line | wire for measuring the voltage concerning the voltage applied to a touch position, and the voltage concerning both ends of a resistance film provided in two resistance films of the touchscreen which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the measurement timing of the voltage in the touchscreen control part which concerns on embodiment of this invention. It is a figure which shows the equivalent circuit of an ideal analog resistive film type touch panel. It is a figure which shows the equivalent circuit of the analog resistive film type touch panel which has an electrical resistance in a wiring part.

Explanation of symbols

  1 mobile phone, 10 touch screen, 20, 301 LCD, 30 power button, 31 selection button, 32 scroll button, 100 CPU, 101, 105, 107 memory, 102 voice input / output unit, 103 baseband processing unit, 104 LCD control , 106 Touch panel control unit, 111 X-axis position detection voltage measurement line, 112 Y-axis position detection voltage measurement line, 113 Analog switch, 113a, 113b, 113c Internal switch, 114, 115, 116 ADC, 117X, 117Y, 118X, 118Y, 119X, 119Y register, 120X, 120Y, 121X, 121Y subtractor, 122X, 122Y LUT, 123 oscillator, 124 touch operation detector, 125 logic circuit, 126X, 127Y register, 27 sequencer, 200,302 LED, 300,1000,1001 touch panel.

Claims (2)

A touch position acquisition device that includes an analog resistive touch panel and acquires a position touched by a touch operation,
Holding means for holding the voltage applied to the touch position of the resistive film of the analog resistive touch panel and the voltage applied to both ends thereof;
Touch position calculation means for calculating a touch position on the analog resistive touch panel based on each voltage held by the holding means;
Touch operation detecting means for detecting a touch operation on the analog resistive touch panel;
Measuring means for measuring the voltage applied to the touch position of the resistive film and the voltage applied to both ends of the resistive film,
Measurement control means for holding the measurement result by the measurement means in the holding means while the touch operation detection means detects the touch operation;
The touch position acquisition apparatus characterized by including. The touch position acquisition device according to claim 1,
The analog resistive touch panel has two resistive films, a resistive film for detecting the X-axis position and a resistive film for detecting the Y-axis position,
The holding means includes a voltage applied to the touch position of the resistive film for detecting the X-axis position and a voltage applied to both ends thereof, a voltage applied to the touch position of the resistive film for detecting the Y-axis position and a voltage applied to both ends thereof. Hold each
The measurement control means includes
The voltage applied to the touch position of the resistive film for detecting the X-axis position and the voltage applied to both ends of the resistive film, the voltage applied to the touch position of the resistive film for detecting the Y-axis position, Switching means for holding the holding means while holding the voltage applied to both ends of the resistance film at a given timing;
Switching control means for controlling the timing of switching by the switching means according to the detection timing of the touch operation by the touch operation detecting means;
including,
The touch position acquisition apparatus characterized by the above-mentioned.

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