WO2014034968A1 - 터치 인식시스템 및 터치 인식방법 - Google Patents
터치 인식시스템 및 터치 인식방법 Download PDFInfo
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- WO2014034968A1 WO2014034968A1 PCT/KR2012/006837 KR2012006837W WO2014034968A1 WO 2014034968 A1 WO2014034968 A1 WO 2014034968A1 KR 2012006837 W KR2012006837 W KR 2012006837W WO 2014034968 A1 WO2014034968 A1 WO 2014034968A1
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- voltage
- bias
- reference voltage
- touch
- ota
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Definitions
- the present invention is to apply a predetermined bias voltage to the receiver channel (Rx) in order to enhance the noise immunity of the touch sensor (Touch Sensor), and to accurately determine whether the touch in the state where the bias voltage is applied
- the present invention relates to a touch recognition system and a touch recognition method.
- the touch sensor is generally divided into a resistive type and a capacitive type.
- a capacitive touch sensor has an object, such as a conductor, between a driving electrode and a sensing electrode. It means a sensor that detects a change in capacitance generated when a contact is made, and determines whether or not a contact is made according to the detection result. That is, the capacitive touch sensor detects the difference between the minute capacitance change and the set value generated when the human body contacts the driving electrode and the sensing electrode to generate the final output signal.
- the change in capacitance is generally measured by detecting the oscillation frequency or the amount of change in the charge / discharge time.
- an object such as a conductor comes into contact between the driving electrode and the sensing electrode of the capacitive touch sensor, the object is separated from the sensing electrode.
- a change in capacitance occurs, and the oscillation frequency or the charge / discharge time is sensed according to the change in capacitance to determine whether or not the contact is made.
- the touch recognition method of the capacitive touch sensor transmits a pulse signal from the transmitter channel (Tx) terminal to detect a change in voltage value coupled to the receiver channel (Rx) terminal to determine whether there is a touch. do.
- the mutual capacitance C M value between the transmitter channel Tx terminal and the receiver channel Rx terminal decreases, so that the coupling voltage V of the receiver channel Rx terminal is reduced.
- Rx ) value is changed slightly.
- the change amount of the coupling voltage V Rx has a value of 10-20 mV, and the change amount determines whether it is touched or untouched.
- the sampling voltage transferring the coupling voltage (V Rx ) of the receiver channel (Rx) stage to the OTA input through two switches (Switch) / Sampling & Hold.
- the coupling voltage V Rx is charged to a capacitor in a sampling period, and the charging voltage V Rx charged to an OTA in a hold period.
- the hold period is particularly vulnerable to noise, making it difficult to accurately transmit the sampling value of the coupling voltage (V Rx ).
- the receiver channel (Rx) stage existing between the high impedance (High Impedance) can be said to be structurally vulnerable to noise, and the receiver channel (Rx) terminal through which the coupling voltage (V Rx ) is output is the noise of the noise.
- V Rx the coupling voltage
- the present invention has been made to solve the above-mentioned problems of the prior art, and enhances the noise immunity of the receiver channel (Rx) outputting the coupling voltage (V Rx ) to more accurately touch / untouch. It is an object of the present invention to provide a touch recognition system and a touch recognition method capable of determining whether or not.
- the present invention further applies by applying a bias voltage to the coupling voltage (V Rx ) and at the same time changing and counting the change amount of the output current (I OUT ) calculated using the reference voltage (V REF ) to a pulse.
- Another object of the present invention is to provide a touch recognition system and a touch recognition method capable of easily determining whether to touch / untouch.
- the coupling voltage (V Rx ) for the change in capacitance due to the application of the driving pulse signal (V Tx_Sig ) of the transmitter channel (Tx) and the presence or absence of touch In a touch recognition system including an output receiver channel (Rx), a touch existing between the transmitter channel (Tx) and the receiver channel (Rx), the touch occurs when the coupling of the voltage (coupling) occurs Pattern portion;
- a bias voltage applying unit converts the coupling voltage V Rx into a bias coupling voltage V Rx_Bias by applying a predetermined bias voltage to the coupling voltage V Rx of the receiver channel Rx terminal of the touch pattern part.
- a first multiplexer MUX_B that receives a reference voltage V REF generated from a reference voltage generator and the bias coupling voltage V Rx_Bias ;
- An Operational Transconductance Amplifier (OTA) for outputting a difference between the bias coupling voltage V Rx_Bias and the reference voltage V REF input from the first multiplexer as a current value;
- OTA Operational Transconductance Amplifier
- a touch determination unit for changing a change amount of the output current I OUT of the OTA into a pulse and counting the change amount of the output current I OUT .
- the reference voltage generator generates a high reference voltage V REFH and a low reference voltage V REFL and supplies the same to the second multiplexer MUX_A, wherein the second multiplexer MUX_A is the driving pulse signal V. depending on the polarity (polarity) of Tx_Sig) it is preferable to supply the high reference voltage (V REFH) or a low reference voltage (V REFL) to the first multiplexer (MUX_B).
- the second multiplexer MUX_A selects the high reference voltage V REFH as a reference voltage V REF to allow the first multiplexer.
- the low reference voltage V REFL is selected as the reference voltage V REF and supplied to the first multiplexer MUX_B. It is desirable to.
- the first multiplexer MUX_B may include a bias coupling voltage V Rx_Bias and a positive coupling terminal and a negative terminal of the OTA.
- V REFH high reference voltage
- V REFL low reference voltage
- V REFL low reference voltage
- the bias coupling voltage V Rx_Bias is changed by the coupling voltage V Rx according to a predetermined time constant ⁇ .
- the touch panel is connected to the output terminal of the OTA, and when a reset signal is generated, an initial voltage for resetting the OTA output terminal voltage V OUT to the initial voltage V INT , wherein the reset signal is When the high (high), a third capacitor (C OUT) and the OTA output voltage (V OUT of the charge or discharge the electric charge by the output current (I OUT) of the OTA changing the OTA output voltage (V OUT) It is preferable to include a first comparator and a second comparator to receive the input, and to determine the presence or absence of the touch by comparing the up-reference voltage (V UP ) and the down-reference voltage (V DN ), respectively.
- V UP up-reference voltage
- V DN down-reference voltage
- the present invention it is preferable to open or short the initial voltage applying stage and the OTA output terminal by a switch according to the operation cycle of the reset signal.
- the OTA output terminal voltage V OUT is untouched when it is kept constant without change at the start point and the end point of the sensing section of one frame.
- the present invention it is preferable to determine a touch when the accumulated change amount of the OTA output terminal voltage V OUT has a negative value during a sensing period of one frame.
- the first comparator receives the OTA output terminal voltage V OUT as a positive input, receives an up-reference voltage V UP as a negative input, and outputs a positive pulse width modulation signal PWM_POS.
- the second comparator preferably receives the OTA output terminal voltage V OUT as a negative input and receives the down-reference voltage V DN as a positive input to output a negative pulse width modulation signal PWM_NEG.
- the up-reference voltage V UP decreases with time, and the down-reference voltage V DN increases with time, so that the OTA output terminal voltage V OUT is increased. It is preferable to be equal to the up-reference voltage V UP or the down-reference voltage V DN at least once in the sensing period of one frame.
- the present invention preferably counts the widths of the positive pulse width modulated signal PWM_POS and the negative pulse width modulated signal PWM_NEG and determines that the count is a touch when the count value becomes lower than a predetermined reference value.
- the transmitter channel driver applying a driving pulse signal (V Tx_Sig ) to the transmitter channel (Tx); Applying a predetermined bias voltage to the receiver channel Rx terminal by a bias voltage applying unit;
- a first multiplexer (MUX_B) receiving a bias coupling voltage (V Rx_Bias ) and a reference voltage (V REF ) to which the bias voltage is applied;
- OTA Operational Transconductance Amplifier
- the reference voltage generator when the first multiplexer MUX_B receives the bias coupling voltage V Rx_Bias and the reference voltage V REF , the reference voltage generator includes a high reference voltage V REFH and a low reference voltage V REFL. ) of the generated step of inputting a second multiplexer (MUX_A) and bias the coupling voltage (V Rx_Bias) a first multiplexer (at the same time and supplies the MUX_B), said second multiplexer (MUX_A) the driving pulse signal (V Tx_Sig)
- the high reference voltage V REFH or the low reference voltage V REFL may be selected and input to the first multiplexer MUX_B according to polarity.
- the step of determining whether or not the touch is performed when the reset signal is low, shortening the OTA output terminal and the initial voltage applying stage, and the reset signal is high
- the OTA output terminal voltage V OUT is received as a positive input in the first comparator, and the OTA output terminal voltage V OUT is negatively input in the second comparator.
- the noise immunity of the receiver channel (Rx) outputs the coupling voltage (V Rx ) used to determine the presence or absence of a touch such as a touch sensor is enhanced. In this way, it is possible to determine whether or not the touch is accurate by escaping the influence of structural noise.
- FIG. 1 is an exemplary view of a touch pad unit according to an embodiment of the present invention.
- FIG. 2 is a block diagram of a touch recognition system according to an embodiment of the present invention.
- FIG. 3 is an exemplary view illustrating a driving pulse signal V Tx_Sig being gradually changed to a coupling voltage V Rx and a bias coupling voltage V Rx_Bias according to an embodiment of the present invention.
- FIG. 4 is an exemplary diagram illustrating a bias coupling voltage V Rx_Bias and a reference voltage V REF input to a first multiplexer according to a driving pulse signal V Tx_Sig according to an embodiment of the present invention.
- FIG. 5 is an exemplary diagram illustrating a bias coupling voltage V Rx_Bias and a reference voltage V REF output from a first multiplexer according to a driving pulse signal V Tx_Sig according to an embodiment of the present invention.
- FIG. 6 is an exemplary diagram illustrating a generation curve of an output current I OUT based on a difference between a bias coupling voltage V Rx_Bias and a reference voltage V REF according to a touch or an untouch according to an embodiment of the present invention.
- Tx_Sig of Output current per cycle (I OUT OTA output voltage (V corresponding to) OUT Exemplary diagram showing a change in).
- FIG. 8 is an exemplary diagram illustrating a change in an OTA output terminal voltage V OUT corresponding to a change in an output current I OUT per sensing period of one frame according to a touch or an untouch according to an embodiment of the present invention.
- FIG. 9 is an exemplary diagram illustrating a counting value of a pulse width modulated signal corresponding to a change in an OTA output terminal voltage V OUT according to a touch or an untouch according to an embodiment of the present invention.
- FIG. 10 is a flowchart illustrating a touch recognition method according to an embodiment of the present invention.
- FIG. 1 is an exemplary view of a touch pad unit according to an embodiment of the present invention.
- the transmitter channel driving driver 105 transmits a driving pulse signal (V Tx_Sig ) to the transmitter channel (Tx) terminal 101 and is output from the receiver channel (Rx) terminal 102.
- V Tx_Sig driving pulse signal
- the presence or absence of a touch is determined by detecting a change in the voltage value V Rx .
- the first capacitor C M which is a pattern capacitor between the transmitter channel Tx terminal 101 and the receiver channel Rx terminal 102.
- the capacitance value of 103 becomes smaller than the capacitance value of the untouch state, so that the coupling voltage V Rx value of the receiver channel Rx terminal 102 changes slightly.
- V AMP of FIG. 1 represents the voltage magnitude of the driving pulse signal V Tx_Sig , and the difference ( ⁇ V) between the coupling voltage value in the untouch state and the coupling voltage value in the touch state has a value of 10 to 20 mV. Then, it is determined whether the touch / untouch is made based on the amount of change in the coupling voltage value.
- the receiver channel Rx stage existing between the high impedances is structurally vulnerable to noise so as to accurately transmit the sampling value of the coupling voltage V Rx .
- a predetermined bias voltage is applied to the output terminal of the receiver channel Rx, and even if there is no separate switch, the coupling voltage V Rx is sampled as a bias voltage and transferred to the Operational Transconductance Amplifier (OTA) 160.
- OTA Operational Transconductance Amplifier
- the coupling voltage V Rx of the present invention includes a magnitude V AMP of the driving pulse signal V Tx_Sig , a transmitter channel Tx terminal 101 of the touch pad unit 110, and a receiver channel ( Rx) is determined by the first capacitor (C M ) 103 which is a pattern capacitor formed between the stage 102 and the second capacitor (C P ) 104 which is a capacitor of the pattern material itself, and the coupling voltage A bias is applied to (V Rx ) to generate a bias coupling voltage (V Rx_Bias ), and then the structure is used for touch / untouch determination.
- FIG. 2 is a block diagram of a touch recognition system according to an embodiment of the present invention.
- the touch recognition system of the present invention includes a receiver channel (Rx) for outputting a coupling voltage (V Rx ) for the change in capacitance due to the application of a driving pulse signal (V Tx_Sig ) of the transmitter channel (Tx) and the presence or absence of a touch.
- V Rx a coupling voltage
- V Tx_Sig driving pulse signal
- the touch pattern unit 110 exists between the transmitter channel Tx and the receiver channel Rx, and a coupling phenomenon of voltage occurs during touch.
- a bias voltage applying unit converting the coupling voltage V Rx into a bias coupling voltage V Rx_Bias by applying a predetermined bias voltage to the coupling voltage V Rx of the receiver channel Rx terminal 102 ( 120, a first multiplexer (MUX_B) 150 that receives the reference voltage V REF generated from the reference voltage generator 130 and the bias coupling voltage V Rx_Bias , and a bias input from the first multiplexer.
- the touch pattern unit 110 may include a plurality of transmitter channels Tx to which a driving pulse signal V Tx_Sig is applied and a plurality of receiver channels Rx corresponding thereto, respectively, and corresponding transmitter channels Tx. Between the terminal 101 and the receiver channel Rx terminal 102, a first capacitor C M , which is a pattern capacitor of the touch pattern unit 110, and a second capacitor C P , which is a capacitor of the pattern material itself, are formed. The coupling voltage V Rx is calculated.
- the driving pulse signal V Tx_Sig is generated by the transmitter channel driving driver 105 to be input to the transmitter channel Tx, and the capacitance value of the first capacitor C M is reduced when the receiver channel (Tx) is touched .
- the coupling voltage V Rx at the Rx end 102 changes.
- the bias voltage applying unit 120 may be formed of a voltage source and a resistor, and converts the coupling voltage V Rx into a bias coupling voltage V Rx_Bias .
- the bias coupling voltage (V Rx_Bias) is, the coupling voltage coupling voltage (V Rx) in accordance with (V Rx) and a time constant by the current ratio input from the bias voltage applying unit (120) ( ⁇ ) Can be modified.
- the reference voltage generator 130 generates the high reference voltage (V REFH) and a low reference voltage (V REFL), and supplies the second multiplexer (MUX_A) (140).
- the second multiplexer (MUX_A) 140 converts the high reference voltage (V REFH ) or the low reference voltage (V REFL ) to the first multiplexer (MUX_B) 150 according to the polarity of the driving pulse signal V Tx_Sig . ).
- the second multiplexer MUX_A 140 may, i) select the high reference voltage V REFH as a reference voltage when the driving pulse signal V Tx_Sig is high, and ii.
- the low reference voltage V REFL may be selected as a reference voltage V REF and input to the first multiplexer MUX_B.
- the first multiplexer MUX_B 150 receives the bias coupling voltage V Rx_Bias and at the same time the high reference voltage V REFH or low according to the polarity of the driving pulse signal V Tx_Sig . It can be said that the reference voltage (V REFL ) is input crosswise .
- the first multiplexer (MUX_B) 150 also has a bias coupling voltage (V Rx_Bias ) or a reference to a positive terminal or a negative terminal of the OTA 160 according to a polarity of a driving pulse signal V Tx_Sig . Toggles and inputs the voltage V REF .
- the first multiplexer (MUX_B) 150 i) when the driving pulse signal (V Tx_Sig ) is high, the bias couple to the (+) and (-) terminal of the OTA (160).
- a ring voltage V Rx_Bias and a high reference voltage V REFH are respectively input, and ii) when the driving pulse signal V Tx_Sig is low, the (+) terminal and ( ⁇ ) of the OTA 160 are low.
- the low reference voltage (V REFL ) and the bias coupling voltage (V Rx_Bias ) may be input to the terminal .
- the OTA 160 compares the bias coupling voltage V Rx_Bias and the high reference voltage V REFH or the low reference voltage V REFL input from the first multiplexer to output the difference between them as a current value. To perform.
- the output current I OUT of the OTA is input to the touch determination unit 190.
- the touch determination unit 190 changes the amount of change in the output current I OUT into a pulse and counts it to finally touch / untouch it. It is determined whether or not.
- the touch panel 190 may include an initial voltage V INT applying stage 170, a third capacitor C OUT 171, a first comparator 180, and a second comparator 181. have.
- the initial voltage V INT applying stage 170 may be opened / shorted by the output terminal of the OTA and a switch 173, and may have a structure in which the switch is opened and closed by a reset signal. That is, when the switch 173 is shorted, an initial voltage V INT is applied to an output terminal of the OTA, and when the switch 173 is opened, the output current and the third capacitor C OUT 171 are applied. As a result, the OTA output terminal voltage V OUT is changed to be input to the first comparator 180 and the second comparator 181.
- the third capacitor C OUT 171 is opened with the initial voltage applying terminal 170 by the switch 173 to output the output current of the OTA.
- the OTA output terminal voltage V OUT is changed by charging or discharging a charge corresponding to (I OUT ).
- the output current I OUT has a positive value and a negative value repeatedly in an untouched state, and the third capacitor C OUT 171 Since the discharge is repeated, the OTA output terminal voltage (V OUT ) increases and decreases, and thus remains constant.
- the output current I OUT always has a negative value in the touch state. Since the third capacitor C OUT 171 repeats only the discharge, a change in the OTA output terminal voltage V OUT is accumulated and accumulated as a negative value.
- the OTA output terminal voltage V OUT when the OTA output terminal voltage V OUT is kept constant without change at the start point and the end point of the sensing section of one frame, it is determined as untouch.
- the change in the OTA output terminal voltage V OUT has a negative value during the sensing period, it is determined as a touch.
- the first comparator 180 receives the OTA output terminal voltage V OUT as a positive input, receives an up-reference voltage V UP as a negative input, and outputs a positive pulse width modulation signal PWM_POS.
- the second comparator 181 receives the OTA output terminal voltage V OUT as a negative input and receives a down-reference voltage V DN as a positive input to output a negative pulse width modulation signal PWM_NEG.
- the up-reference voltage V UP decreases with time, and the down-reference voltage V DN increases with time, so that the OTA output terminal voltage V OUT is 1. It is preferable to be equal to the up-reference voltage V UP or the down-reference voltage V DN at least once within the sensing period of the frame.
- the OTA output terminal voltage V OUT , the up-reference voltage V UP , and the down-reference voltage V DN are inputted to the first comparator 180 and the second comparator 181 to form a positive pulse width modulation signal ( When the PWM_POS) or the negative pulse width modulated signal PWM_NEG is output, a predetermined counter (not shown) counts the width of the pulse width modulated signal to determine the touch when it is lower than the reference value.
- the touch panel 190 changes the change amount of the output current I OUT at the time of touch or untouch to a pulse for the change of the OTA output terminal voltage V OUT , and counts the width to determine whether the touch is performed. It can be said.
- FIG. 3 is an exemplary diagram illustrating how the driving pulse signal V Tx_Sig is gradually changed into a coupling voltage V Rx and a bias coupling voltage V Rx_Bias according to an embodiment of the present invention.
- FIG. 3A illustrates a driving pulse signal V Tx_Sig generated by the transmitter channel driving driver 105 and applied to the transmitter channel Tx.
- V Tx_Sig the magnitude of the driving pulse signal V Tx_Sig is increased. It appears as V AMP .
- FIG. 3B illustrates a coupling voltage V Rx signal, in which the first capacitor C M 103, which is a pattern capacitor of the touch pad unit 110, and a second capacitor, which is a capacitor of the pattern material itself.
- the coupling voltage V Rx is determined by (C P ) 104.
- the capacitance value of the first capacitor C M 103 decreases in the coupling voltage V Rx at the time of touch, the magnitude V AMP and the second capacitor C P of the driving pulse signal V Tx_Sig are reduced.
- the capacitance value of (104) together that is, according to the voltage distribution law, the size is about 10-20 mV lower than when no touch occurs.
- FIG. 3 is the coupling voltage (V Rx) there is shown a bias coupling voltage (V Rx_Bias) signal generated by applying a bias to the receiver channel (Rx) coupling the voltage (V Rx outputted from ) And the coupling voltage V Rx is modified using the time constant ⁇ , which is the ratio of the current flowing from the bias voltage applying stage 120.
- the time constant ⁇ has a value of RC, where R is a resistance of the bias voltage applying stage 120, and C is a second capacitor C P.
- V Rx_Bias The bias coupling voltage (V Rx_Bias ) signal is finally used to determine the presence or absence of a touch through a predetermined signal processing process.
- FIG. 4 is an exemplary diagram illustrating a bias coupling voltage V Rx_Bias and a reference voltage V REF input to a first multiplexer according to a driving pulse signal V Tx_Sig according to an embodiment of the present invention.
- the first multiplexer (MUX_A) (140) is connected to the transmitter channel driving driver 105, and real-time detects the polarity (Polarity) of the driving pulse signal (V Tx_Sig), the driving pulse signal (V Tx_Sig)
- the reference voltage V REF is input to the second multiplexer MUX_B 150 corresponding to the polarity.
- the first multiplexer MUX_A 140 may, i) output a high reference voltage V REFH when the driving pulse signal V Tx_Sig is high, and ii) the driving pulse signal V Tx_Sig.
- the low reference voltage V REFL may be output and input to the second multiplexer MUX_B 150.
- FIG. 5 is an exemplary diagram illustrating a bias coupling voltage V Rx_Bias and a reference voltage V REF output from the first multiplexer according to a driving pulse signal V Tx_Sig according to an embodiment of the present invention.
- the first multiplexer (MUX_B) 150 is connected to the (+) terminal or the (-) terminal of the OTA 160 according to the polarity of the driving pulse signal V Tx_Sig , and the bias coupling voltage V Rx_Bias or reference. Toggle the voltage V REF and input it.
- the reference voltage (V REF) is a pulse signal driving the second multiplexer the high reference voltage (V REFH) or a low reference voltage (V REFL) received from the (MUX_A) according to the polarity of the (V Tx_Sig).
- the bias coupling voltage V Rx_Bias / reference voltage V REF may be input by being toggled as shown in Table 1 below.
- the first multiplexer (MUX_B) 150 couples a bias couple to the positive terminal of the OTA 160 when the driving pulse signal V Tx_Sig is high.
- the ring voltage V Rx_Bias is input, and the high reference voltage V REFH is input to the negative terminal of the OTA 160.
- the first multiplexer MUX_B 150 inputs a low reference voltage V REFL to the positive terminal of the OTA 160 when the driving pulse signal V Tx_Sig is low.
- the bias coupling voltage V Rx_Bias is input to the negative terminal of the OTA 160.
- FIG. 6 is an exemplary diagram illustrating a generation curve of an output current I OUT based on a difference between a bias coupling voltage V Rx_Bias and a reference voltage V REF according to a touch or untouch according to an embodiment of the present invention. .
- the first multiplexer (MUX_B) bias the coupling voltage (V Rx_Bias) and the reference voltage (V REF) OTA (160) the input to the bias coupling voltage (V Rx_Bias) and the reference voltage (V REF) from the 150
- the difference is output as a current, and the output current I OUT is calculated in proportion to Equation 1 below.
- Gm is a gain value of the OTA 160 and R CPL is a coupling ratio of the touch pad unit 110.
- the output current I OUT increases as the gain value of the OTA or the magnitude of the driving pulse signal V Tx_Sig increases, and also the bias coupling voltage V Rx_Bias and the reference voltage V. REF ) increases as the difference increases.
- the bias coupling voltage V Rx_Bias is greater than the high reference voltage V REFH in the first phase section, and a positive current is output by the difference.
- the bias coupling voltage V Rx_Bias is smaller than the high reference voltage V REFH so that the negative current is output from the OTA 160 by the difference.
- the bias coupling voltage V Rx_Bias value is smaller than the low reference voltage V REFL value, and a positive current is output by the difference
- the bias voltage coupling (V Rx_Bias) value is greater than the value of the low reference voltage (V REFL) by the difference between the (-) current is output from the OTA.
- the OTA output terminal voltage V OUT converted from the output current I OUT is kept constant at the start and end points of the half cycle or one cycle.
- the bias coupling voltage V Rx_Bias value is smaller than the untouch state.
- the bias coupling voltage V Rx_Bias value is smaller than the high reference voltage V REFH value in the first phase section when touched , so that a negative current is output by the difference, and the second phase In the section 2), the bias coupling voltage V Rx_Bias is smaller than the high reference voltage V REFH so that the negative current is output from the OTA 160 by the difference.
- the bias coupling voltage V Rx_Bias value is smaller than the low reference voltage V REFL value in the third phase section when touched , a negative current is output by the difference, and a fourth phase is output.
- the bias coupling voltage V Rx_Bias is smaller than the low reference voltage V REFL so that the negative current is output from the OTA 160 by the difference.
- the OTA output terminal voltage V OUT converted from the output current I OUT is It can be seen that the cycle of the driving pulse signal V Tx_Sig decreases as the cycle is repeated.
- FIG. 7 illustrates a change in the OTA output terminal voltage V OUT corresponding to a change in the output current I OUT per cycle of the driving pulse signal V Tx_Sig according to a touch or untouch according to an embodiment of the present invention.
- 8 is an exemplary diagram illustrating a change in an OTA output terminal voltage V OUT corresponding to a change in an output current I OUT per sensing period of one frame according to a touch or an untouch according to an embodiment of the present invention. It is also.
- the OTA output terminal of the touch panel 190 resets to the initial voltage V INT when the switch 173 is shorted when the reset signal is low, and then switches to the initial voltage V INT when the reset signal is high.
- OTA output terminal voltage (V OUT ) 172 changed by the output current I OUT is input to the (+) terminal of the first comparator 180 and the (-) terminal of the second comparator 181. It is converted into a pulse width modulated signal.
- the reset signal may be referred to as a sensing period of one frame set by a user, and the sensing period of the one frame may be a sum of a plurality of periods of the driving pulse signal V Tx_Sig set by the user. That is, the sensing period of the one frame may be formed by overlapping the period of the driving pulse signal (V Tx_Sig ) as required by the invention.
- a positive current value output through the OTA 160 in the first and second phases 1 and 2 and the third and fourth phases is determined.
- the OTA output terminal voltage V OUT reflecting the negative current values cancels each other is kept the same at the start and end points of one cycle of the driving pulse signal V Tx_Sig .
- V OUT becomes substantially the same at the start point of the first phase section and the end point of the second phase section.
- the OTA output terminal voltage (V OUT ) also has only a change in the negative direction, and the period of the driving pulse signal (V Tx_Sig ) is repeated. As the OTA output voltage V OUT continues to decrease.
- the OTA output terminal voltage V OUT continuously decreases in the first to fourth phase sections, and when one cycle of the driving pulse signal V Tx_Sig ends, the value of the OTA output terminal voltage V OUT for half a period is reached . It can be seen that the amount of change ( ⁇ V OUT ) 'decreases by twice.
- a plurality of driving pulse signals V Tx_Sig ) Is output during the sensing period of 1 frame formed by overlapping periods Output current (I OUT ) And OTA output voltage (V OUT ) Shows the change of).
- the third capacitor C OUT repeats the charging and discharging, so the OTA output terminal voltage V OUT is also The increase and decrease is repeated, and there is almost no change in the OTA output terminal voltage V OUT at the start and end of the sensing period of one frame.
- the change amount of the OTA output terminal voltage (V OUT ) per one cycle of the driving pulse signal (V Tx_Sig ) according to the touch is '2 times the change amount ( ⁇ V OUT ) of the OTA output terminal voltage (V OUT ) value for half a cycle'. Confirm that ⁇ V OUT '.
- the cumulative change amount of the OTA output terminal voltage V OUT increases, which makes it easier to determine whether the touch is performed.
- the number of operations repeatedly performed during one frame may be determined by the operating speed and the clock frequency of the system.
- FIG. 9 is an exemplary diagram illustrating a counting value of a pulse width modulated signal corresponding to a change in an OTA output terminal voltage V OUT according to a touch or an untouch according to an embodiment of the present invention.
- the OTA output terminal voltage V OUT is kept constant, whereas in the touch state, the third capacitor C OUT discharges. Since only the repetition is performed, the OTA output voltage V OUT decreases.
- a positive pulse is compared by comparing an OTA output terminal voltage V OUT in a touch / untouch state with an up-reference voltage V UP or a down-reference voltage V DN for final determination of touch.
- the width modulated signal PWM_POS or the negative pulse width modulated signal PWM_NEG is generated.
- the language OTA output voltage (V OUT) at the time of touch is to check maintained constant without change, OTA output voltage (V OUT) at the time of touch is while continuously decreased during the sensing period of the first frame ground If it is (Ground), it is kept constant. If the reset signal is low, the voltage value of the OTA output terminal voltage (V OUT ) is short-circuited with the initial voltage (V INT ). .
- a section between the intersection point (191, 192) of the OTA output terminal voltage (V OUT ) curve and the up-reference voltage (V UP ) curve or the down-reference voltage (V DN ) curve at the time of touch is determined as a touch state.
- the pulse counting section of the output pulse width modulation signals PWM_POS and PWM_NEG is counted, and the value is lower than the reference value.
- a predetermined counter counts the negative pulse width modulation signal PWM_NEG to determine a section lower than the reference value as the section NEG_DATA 193 of the counting value where the touch occurs.
- the OTA output voltage (V OUT ) does not change during the sensing period of one frame, at the end of one frame, the OTA output voltage (V OUT ) crosses the up-reference voltage (V UP ) to positive pulse.
- the width modulated signal PWM_POS is generated and its counting value has a positive value close to zero.
- the negative output pulse voltage modulation signal PWM_NEG is generated when the OTA output terminal voltage V OUT crosses the down-reference voltage V DN , and the counting value has a negative value.
- the touch / untouch is determined from the counting value calculated as described above. For example, if a predetermined reference value (eg, 0) is set, the touch value is determined as a touch.
- the up-reference voltage (V UP ) curve and down-reference voltage may be generated so that any one of the positive pulse width modulated signal PWM_POS or the negative pulse width modulated signal PWM_NEG is generated during system operation. It would be desirable to design the (V DN ) curve to be focused to the initial voltage (V INT ) at the time of untouch.
- FIG. 10 is a flowchart illustrating a touch recognition method according to an embodiment of the present invention.
- the transmitter channel driver applies a driving pulse signal V Tx_Sig to the transmitter channel Tx (S11).
- the driving pulse signal V Tx_Sig has a predetermined voltage magnitude V AMP and is output as a coupling voltage V Rx by a coupling phenomenon when a touch occurs.
- a predetermined bias voltage is applied to the receiver channel Rx terminal by the bias voltage applying unit (S12), and the coupling voltage V Rx is converted into a bias coupling voltage V Rx_Bias . .
- the first multiplexer MUX_B receives a step of receiving the bias coupling voltage V Rx_Bias and the reference voltage V REF to which the bias voltage is applied (S13).
- the reference voltage generator When the first multiplexer MUX_B receives the reference voltage V REF , the reference voltage generator generates a high reference voltage V REFH and a low reference voltage V REFL to the second multiplexer MUX_A. Thereafter, the second multiplexer MUX_A inputs the high reference voltage V REFH or the low reference voltage V REFL to the first multiplexer MUX_B according to the polarity of the driving pulse signal V Tx_Sig . Can be.
- the bias coupling voltage V Rx_Bias and the reference voltage V REF are received by the OTA, and the difference between the two is output as a current value (S14).
- the first multiplexer MUX_B is connected to the bias coupling voltage V Rx_Bias or the reference voltage to the (+) terminal or the ( ⁇ ) terminal of the OTA according to the polarity of the driving pulse signal V Tx_Sig . It can be input by toggling (V REF ), which effectively prevents the change of OTA output terminal voltage (V OUT ) during one period of driving pulse signal (V Tx_Sig ) in the untouch state. To judge.
- the touch determination unit changes the amount of change in the output current I OUT of the OTA into a pulse and counts it to determine whether the touch is performed (S15).
- the touch determination step S15 when a reset signal input to the touch panel becomes low, the OTA output terminal and the initial voltage applying stage are shorted to be initialized. When the reset signal is high, the OTA output stage and the initial voltage application stage are opened.
- the first comparator receives the OTA output terminal voltage V OUT as a positive input
- the second comparator receives the OTA output terminal voltage V OUT as a negative input, respectively, an up-reference voltage V UP and a down-reference voltage.
- the positive pulse width modulated signal PWM_POS and the negative pulse width modulated signal PWM_NEG are outputted as compared with V DN .
- the pulse width modulated signals PWM_POS and PWM_NEG are counted, and the counting value is compared with a predetermined reference value, and when the counting value is lower than the reference value (eg, 0), it is determined as a touch. In comparison, if there is no change, it is determined as untouch.
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Abstract
Description
Claims (16)
- 트랜스미터 채널(Tx)의 드라이빙 펄스 신호(VTx_Sig) 인가 및 터치 유무로 인한 정전용량 변화에 대한 커플링 전압(VRx)을 출력하는 리시버 채널(Rx)을 포함하는 터치인식 시스템에 있어서,상기 트랜스미터 채널(Tx)과 리시버 채널(Rx) 사이에 존재하며, 터치(Touch)시 전압의 커플링(coupling) 현상이 발생하는 터치 패턴부;상기 터치 패턴부의 리시버 채널(Rx)단의 커플링 전압(VRx)에 소정의 바이어스 전압을 인가하여 상기 커플링 전압(VRx)을 바이어스 커플링 전압(VRx_Bias)으로 변환하는 바이어스 전압인가부;레퍼런스 전압 생성부로부터 생성된 레퍼런스 전압(VREF)과 상기 바이어스 커플링 전압(VRx_Bias)을 입력받는 제 1멀티플렉서(MUX_B);상기 제 1멀티플렉서로부터 입력되는 바이어스 커플링 전압(VRx_Bias)과 레퍼런스 전압(VREF)의 차이를 전류값으로 출력하는 OTA(Operational Transconductance Amplifier); 및상기 OTA의 출력전류(IOUT)의 변화량을 펄스로 변경하고 이를 카운팅하여 터치여부를 판정하는 터치판정부;를 포함하는 터치인식 시스템.
- 제 1항에 있어서,상기 레퍼런스 전압생성부는 하이 레퍼런스 전압(VREFH) 및 로우 레퍼런스 전압(VREFL)을 생성하여 제2 멀티플렉서 (MUX_A)에 공급하되,상기 제2 멀티플렉서 (MUX_A)는 상기 드라이빙 펄스 신호(VTx_Sig)의 극성(Polarity)에 따라 상기 하이 레퍼런스 전압(VREFH) 또는 로우 레퍼런스 전압(VREFL)을 제 1 멀티플렉서 (MUX_B)에 공급하는 것을 특징으로 하는 터치인식 시스템.
- 제 2항에 있어서, 상기 제 2 멀티플렉서 (MUX_A)는,상기 드라이빙 펄스 신호(VTx_Sig)가 하이(High)일 때, 상기 하이 레퍼런스 전압(VREFH)을 레퍼런스 전압(VREF)으로 선택하여 상기 제 1 멀티플렉서 (MUX_B)에 공급하고,상기 드라이빙 펄스 신호(VTx_Sig)가 로우(Low)일 때, 상기 로우 레퍼런스 전압(VREFL)을 레퍼런스 전압(VREF)으로 선택하여 상기 제 1 멀티플렉서 (MUX_B)에 공급하는 것을 특징으로 하는 터치인식 시스템.
- 제 1항에 있어서, 상기 제 1 멀티플렉서 (MUX_B)는,상기 드라이빙 펄스 신호(VTx_Sig)의 극성에 따라 상기 OTA의 (+) 단자 또는 (-)단자에, 상기 바이어스 커플링 전압(VRx_Bias) 또는 레퍼런스 전압(VREF)을 토글링(Toggling)하여 입력하는 것을 특징으로 하는 터치인식시스템.
- 제 4항에 있어서, 상기 제 1 멀티플렉서 (MUX_B)는,상기 드라이빙 펄스신호(VTx_Sig)가 하이(High)일 때, 상기 OTA의 (+)단자 및 (-)단자에 바이어스 커플링 전압(VRx_Bias) 및 하이 레퍼런스 전압(VREFH)을 각각 입력하고,상기 드라이빙 펄스신호(VTx_Sig)가 로우(Low)일 때, 상기 OTA의 (+)단자 및 (-)단자에 로우 레퍼런스 전압(VREFL) 및 바이어스 커플링 전압(VRx_Bias)을 각각 입력하는 것을 특징으로 하는 터치인식 시스템.
- 제 1항에 있어서, 상기 바이어스 커플링 전압(VRx_Bias)은,상기 커플링 전압(VRx)을 소정의 시정수(τ)에 따라 변화시킨 것을 특징으로 하는 터치인식 시스템.
- 제 1항에 있어서, 상기 터치판정부는,상기 OTA의 출력단에 연결되되, 리셋(Reset) 신호가 발생하면 OTA 출력단 전압(VOUT)을 초기 전압(VINT)으로 리셋시키는 초기전압인가단;상기 리셋 신호가 하이(High)가 되면, 상기 OTA의 출력전류(IOUT)에 의해 전하를 충전 또는 방전하여 상기 OTA 출력단 전압(VOUT)을 변화시키는 제3커패시터(COUT); 및상기 OTA 출력단 전압 (VOUT)을 입력 받아, 업-레퍼런스 전압(VUP) 및 다운-레퍼런스 전압(VDN)과 각각 비교하여 터치유무를 판정하는 제1비교기와 제2비교기;를 포함하는 것을 특징으로 하는 터치인식 시스템.
- 제 7항에 있어서,상기 리셋(Reset) 신호의 동작 주기에 따라 상기 초기전압인가단과 OTA 출력단을 스위치에 의해 개방(Open) 또는 단락(Short)시키는 것을 특징으로 하는 터치인식 시스템.
- 제 7항에 있어서,상기 OTA 출력단 전압 (VOUT)이 1 프레임(Frame)의 센싱구간의 시작점과 종료점에서 변화없이 일정하게 유지될 때 언터치(Untouch)로 판정하는 것을 특징으로 하는 터치인식 시스템.
- 제 7항에 있어서,1 프레임(Frame)의 센싱구간 동안 상기 OTA 출력단 전압(VOUT)의 누적 변화량이 음(陰)의 값을 가질 때 터치(Touch)로 판정하는 것을 특징으로 하는 터치인식 시스템.
- 제 7항에 있어서,상기 제 1비교기는, 상기 OTA 출력단 전압(VOUT)을 정입력으로 받고, 업-레퍼런스 전압(VUP)을 부입력으로 받아 포지티브 펄스폭 변조신호(PWM_POS)를 출력하고,상기 제2비교기는, 상기 OTA 출력단 전압(VOUT)을 부입력으로 받고, 다운-레퍼런스 전압(VDN)을 정입력으로 받아 네가티브 펄스폭 변조신호(PWM_NEG)를 출력하는 것을 특징으로 하는 터치인식 시스템.
- 제 11항에 있어서,상기 업-레퍼런스 전압(VUP)은 시간의 증가에 따라 감소하게 하고, 상기 다운-레퍼런스 전압(VDN)은 시간의 증가에 따라 증가하게 하여, 상기 OTA 출력단 전압 (VOUT)이 1프레임(Frame)의 센싱구간 내에서 적어도 한 번은 업-레퍼런스 전압(VUP) 또는 다운-레퍼런스 전압(VDN)과 동일해 지도록 하는 것을 특징으로 하는 터치인식 시스템.
- 제 11항에 있어서,상기 포지티브 펄스폭 변조신호(PWM_POS) 및 네가티브 펄스폭 변조신호(PWM_NEG)의 폭을 카운팅하여 그 카운팅값이 소정의 기준값보다 낮아졌을 때 터치(Touch)로 판정하는 것을 특징으로 하는 터치인식 시스템.
- 트랜스미터 채널 드라이버가 트랜스미터 채널(Tx)에 드라이빙 펄스신호(VTx_Sig)를 인가하는 단계;바이어스 전압인가부에 의해 리시버 채널(Rx)단에 소정의 바이어스 전압을 인가하는 단계;제 1멀티플렉서(MUX_B)가 상기 바이어스 전압이 인가된 바이어스 커플링 전압(VRx_Bias)과 레퍼런스 전압(VREF)을 입력받는 단계;OTA(Operational Transconductance Amplifier)에서 상기 바이어스 커플링 전압(VRx_Bias)과 레퍼런스 전압(VREF)을 입력받아, 양자의 차이를 전류값으로 출력하는 단계; 및터치판정부에서 상기 OTA의 출력전류(IOUT)의 변화량을 펄스로 변경하고 이를 카운팅하여 터치여부를 판정하는 단계;를 포함하는 터치 인식방법.
- 제 14항에 있어서, 상기 제 1멀티플렉서(MUX_B)가 바이어스 커플링 전압(VRx_Bias) 및 레퍼런스 전압(VREF)을 입력받는 단계는,레퍼런스 전압생성부가 하이 레퍼런스 전압(VREFH) 및 로우 레퍼런스 전압(VREFL)을 생성하여 제2 멀티플렉서 (MUX_A)에 입력하는 단계; 및바이어스 커플링 전압(VRx_Bias)을 제 1 멀티플렉서 (MUX_B)에 공급함과 동시에 상기 제2 멀티플렉서 (MUX_A)가 드라이빙 펄스 신호(VTx_Sig)의 극성(Polarity)에 따라 상기 하이 레퍼런스 전압(VREFH) 또는 로우 레퍼런스 전압(VREFL)을 선택하여 상기 제 1 멀티플렉서 (MUX_B)에 입력하는 단계;인 것을 특징으로 하는 터치 인식방법.
- 제 14항에 있어서, 상기 터치여부 판정단계는,리셋(Reset) 신호가 로우(Low)가 되면, 상기 OTA 출력단과 초기전압인가단을 단락(short)시키는 단계;리셋(Reset) 신호가 하이(High)가 되면, 상기 OTA 출력단과 초기전압인가단을 개방(open)시키는 단계;제 1비교기에서 OTA 출력단 전압(VOUT)을 정입력으로 받고, 제 2비교기에서 상기 OTA 출력단 전압(VOUT)을 부입력으로 받아 각각 포지티브 펄스폭 변조신호(PWM_POS) 및 네가티브 펄스폭 변조신호(PWM_NEG)를 출력하는 단계; 및상기 펄스폭 변조신호(PWM_POS,PWM_NEG)를 카운팅하여 그 카운팅값을 소정의 기준값과 비교하여 터치여부를 판정하는 단계;를 포함하는 것을 특징으로 하는 터치 인식방법.
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US20110175823A1 (en) * | 2010-01-21 | 2011-07-21 | Vieta William Matthew | Negative Pixel Compensation |
KR20120055354A (ko) * | 2010-11-23 | 2012-05-31 | 삼성전자주식회사 | 입력 감지 소자 및 이를 구비한 터치 패널 |
KR20120078355A (ko) * | 2010-12-31 | 2012-07-10 | 하이디스 테크놀로지 주식회사 | 터치 패널의 센싱 회로 및 그의 센싱 방법 |
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KR20140072765A (ko) | 2014-06-13 |
KR101507138B1 (ko) | 2015-04-01 |
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