WO2013183917A1 - Touch detection method and apparatus - Google Patents

Touch detection method and apparatus Download PDF

Info

Publication number
WO2013183917A1
WO2013183917A1 PCT/KR2013/004925 KR2013004925W WO2013183917A1 WO 2013183917 A1 WO2013183917 A1 WO 2013183917A1 KR 2013004925 W KR2013004925 W KR 2013004925W WO 2013183917 A1 WO2013183917 A1 WO 2013183917A1
Authority
WO
WIPO (PCT)
Prior art keywords
touch
sensor
plurality
signal
sensor pads
Prior art date
Application number
PCT/KR2013/004925
Other languages
French (fr)
Korean (ko)
Inventor
손영석
이제혁
이승은
Original Assignee
크루셜텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR10-2012-0060010 priority Critical
Priority to KR20120060010 priority
Priority to KR20120122449A priority patent/KR101482931B1/en
Priority to KR10-2012-0122449 priority
Application filed by 크루셜텍 주식회사 filed Critical 크루셜텍 주식회사
Publication of WO2013183917A1 publication Critical patent/WO2013183917A1/en

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input 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
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Abstract

A touch detection method of a touch panel that includes sensor pads separated from each other, which is provided according to one embodiment of the present invention, comprises: a step of selecting a plurality of sensor pads; a step of charging the selected plurality of sensor pads and acquiring simultaneously signals outputted in response to the alternating voltage supplied in a floating state; and a step of converting the outputted signals simultaneously acquired from the plurality of sensor pads into digital signals.

Description

Touch detecting method and apparatus

The present invention relates to a method and apparatus for reducing, more specifically, is output from a plurality of touch sensor, touch detection time by obtaining a signal required to determine whether or not the touch at the same time relates to touch detection methods and apparatus.

The touch screen panel is used for characters and graphics on the screen of the video display device as a device to input a user's command to contact the other contact means or the human finger, it is deposited on the image display device. The touch screen panel converts a contact position in contact with such as the human finger into an electrical signal. The electrical signal is used as an input signal.

1 is an exploded plan view of one example of a capacitive touch screen panel according to the prior art.

Referring to Figure 1, the touch screen panel 10 includes a transparent substrate 12 and transparent substrate 12, the first sensor pattern layer 13 sequentially formed over the first insulating layer 14, the second sensor pattern layer ( 15) and it comprises a second insulating layer 16 and metal wire 17.

First sensor pattern layer 13 can be connected along a lateral direction on the transparent substrate 12, is connected to the row by row, the metal wire 17.

A second sensor pattern layer 15 is a first can be coupled along the column direction on the insulating film layer 14, the first sensor pattern layer 13 not to overlap with the first sensor pattern layer 13 and are arranged alternately . In addition, the second sensor pattern layer 15 is connected to the metal wire 17 in a column.

When the fingers and the contact means of the person in contact with the touch screen panel 10 includes first and second sensor pattern layer (13, 15) and the change in the capacitance according to the contact position passes the side of the driving circuit via the metal wire 17 do. And the contact position is identified as a change in capacitance thus pass conversion to an electrical signal.

Between tin oxide (ITO) to be provided with a pattern made of a transparent conductive material, such as separately, and the sensor pattern layer (13, 15), but the touch screen panel 10 includes the sensor pattern layer (13, 15) on the indium It is provided with an insulating layer 14, so the thickness is increased.

In addition, the number of the change in capacitance caused by the fine-touch turn be accumulated to be detected a change in capacitance at a high frequency because it can be a touch detection. And, in order to sufficiently accumulate the change of capacitance on time it requires a metal line to maintain a low resistance, then this metal wiring is a thick bezel to the border of the touch screen to generate an additional mask step.

Fig. In order to solve this problem the touch detection device such as that shown in Figure 2 has been proposed.

Also the touch detecting device is shown in Figure 2 it includes a touch panel 20 and the drive device 30 and the circuit board 40 connecting the two.

Touch panel 20 is formed on substrate 21 and includes a plurality of sensor pads 22 and the plurality of signal wirings 23 that are connected to the sensor pads 22 that are arranged in a matrix form of a polygon.

Each signal wire 23 is at one end connected to the sensor pad 22. The other end extends to the lower edge of the substrate 21. Sensor pad 22 and signal wirings 23 may be patterned on the cover glass 50. The

Drive device 30 is one for selecting a plurality of sensor pads 22 in order to measure the capacitance of the sensor pad 22, and recall detecting a touch occurrence through it.

For the capacitance measurements on a sensor pad 22, the sensor pads 22 free chyajing time landscape chyajing after floating time until the voltage changes upon application of a driving voltage to return to normal operation from the signal conversion for this determines whether a touch occurs and the time it is needed.

Conventionally, because it is possible at a time one of the touch occurrence detecting only the sensor pad 22, it has been required a long time detecting whether a touch occurs on all of the sensor pad (22).

The present invention as its object to solve the problems of the aforementioned prior art.

It is another object of the present invention, in a touch panel including a plurality of sensor pads are arranged to be isolated, to keeping the conventional structure, as it reduces the touch detection time, and characters.

In accordance with one embodiment of the present invention for achieving the above object, according to a touch detection method for a touch panel including a sensor pad to be placed in isolation from each other, selecting a plurality of the sensor pad; Obtaining a signal outputted in response to the alternating voltage supplied by the floating state after charging of the plurality of sensor pads the selected at the same time; And a touch detection method comprising the step of converting into a digital signal an output signal obtained at the same time from the plurality of sensor pads are provided in sequence.

The plurality of sensor pads selecting step, a plurality of multiplexers that are connected via one or more wires and a sensor pad signal may include the step of selecting the one of the sensor pads.

The sensor pads are arranged in a matrix form of M × N, wherein the plurality of multiplexers can be implemented to the N multiplexers being connected to the M number of sensor pads, respectively.

The signals obtained at the same time from a plurality of sensor pads is selected for performing the analog conversion by a multiplexer may be sequentially input to the digital converter.

Through the transformed signal based on the voltage variation of the difference in the sensor pads according to the alternating voltage and in case of non-touch occurs it may further comprise the step of detecting a touch or not.

Meanwhile, according to another embodiment of the present invention, there is provided a touch detection apparatus of a touch panel including a sensor pad to be placed in isolation from each other, the plurality of first multiplexers for selecting a plurality of sensor pads, respectively; A second multiplexer for receiving the signal output in response to a charge of a plurality of sensor pads is selected by the first multiplexer alternating voltage supplied by the floating state at the same time; And analog converting the signal to be sequentially output from the second multiplexer into a digital signal, a touch detection apparatus comprising a digital converter is provided.

The sensor pads are arranged in a matrix form of M × N, wherein the first multiplexer is implemented dogs N may be connected to the M number of sensor pads, respectively.

The touch detection device, through the converted signal on the basis of the voltage variation in the difference between the sensor pads according to the alternating voltage and in case of non-touch occurred may further include a level shift detector for detecting a touch or not.

Since according to the present invention, in a touch panel including a plurality of sensor pads that are isolated are arranged, to obtain a signal necessary for the touch is detected from the plurality of sensor pads at the same time, the touch detection time required for the entire touch panel It can be greatly reduced.

1 is an exploded plan view of a conventional touch panel.

Figure 2 is an exploded plan view of a conventional touch sensing device.

Figure 3 is a block diagram illustrating a structure of the touch detecting device.

4 is a circuit diagram illustrating a detailed internal structure of the touch detecting device.

5 is a circuit diagram illustrating a driving circuit of the touch detecting device.

6 is an exemplary waveform for explaining the operation of the touch detecting device.

7 is a waveform chart showing a sensor output pad voltage changes over time in the touch detection procedure.

8 is a flow chart illustrating a touch detection method according to an embodiment of the present invention.

Detailed description of the present invention described below are described with reference to the accompanying drawings showing by way of illustration specific embodiments in which the invention may be practiced. These embodiments are described in detail sufficient itgie those skilled in the art to practice the invention. Various embodiments of the present invention to be understood that different mutually exclusive is no need each other. For example, a particular feature, structure, and characteristic described herein may be implemented as other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. In addition, the location or arrangement of individual elements within each disclosed embodiment is to be understood that changes may be made without departing from the spirit and scope of the invention. Therefore, the following description is not to be taken as limiting sense, the scope of the present invention, if properly described, the claims are limited only by the terms of the appended claims along with the full range equivalent to that claim. Like reference numerals in the drawings refer to the same or similar functionality throughout the several aspects.

Hereinafter, in order that the self this invention one of ordinary skill in the art can be easily performed with reference to the accompanying drawings, with respect to a preferred embodiment of the present invention will be described in detail.

[Preferred embodiments of the present invention;

3 is a view showing a structure of the touch detecting device according to one embodiment.

Referring to Figure 3, a touch detection device comprises a touch panel 100 and the driving unit 200. The

The touch panel 100 comprises a plurality of signal wiring 120 is connected to a plurality of the sensor pad 110 and a sensor pad (110).

For example, a plurality of sensor pads 110 may be a square or diamond-shaped, and this may be a different shape, may be a polygonal shape of a uniform shape. Sensor pad 110 may be arranged in a matrix of adjacent polygons.

Drive device 200 may be implemented as a touch detection unit 210, a touch-information processing unit 220, memory 230 and controller 240 may include one or more integrated circuit (IC) chip.

The touch detection unit 210, a touch-information processing unit 220, memory 230, a controller 240 are each separated, and two or more components may be implemented is integrated.

The touch detection unit 210 may comprise a plurality of switches and the plurality of capacitors associated with the sensor pad 110 and the signal wiring 120, and receives a signal from the controller 240 drives the circuit for the touch detection, touch and it outputs a voltage corresponding to the detection result. In addition, the touch detection unit 210, an amplifier and an analog-to-digital converter may include, converting the difference between the voltage change in the sensor pad 110, amplified or digitized can be stored in the memory 230.

Touch information processing unit 220 generates the information necessary for the processing by the touch whether the digital voltage, such as a touch area and a touch coordinates stored in the memory 230.

The memory 230 stores the predetermined data or receive real time data that is used in the digital voltage and the touch detection, area calculation, the touch coordinate calculation based on the difference of the voltage variation detected by the touch detection unit 210.

Control unit 240 controls the touch detection unit 210 and the touch information processing unit 220, may include a micro-control unit (micro control unit, MCU), may perform a predetermined signal processing by the firmware.

Referring to Fig. 4, it will be described in detail an operation of the touch detection unit 210.

Referring to Figure 4, the touch detection unit 210 includes a first multiplexer (MUX1) for the number of columns of the sensor pad 110 is disposed isolated from each other in a matrix form. It was 4 in the illustrated example in which the M × N number of sensor pads 110 arranged in a matrix form, and thus, is provided with N number of the first multiplexer (MUX1) corresponding to the number of columns of the sensor pad (110).

A first multiplexer (MUX1) selects one of the one column part of the M sensor pad 110 and each connected to M signal lines 120, which. Signal associated with the selection may be supplied from the controller 240.

The output signal of the sensor pad 110 connected to the selected signal line 120 is input to a second multiplexer (MUX2). The output signal of the sensor pad 110 may be output by the operation of the driving circuit 211.

A second multiplexer (MUX2) includes N first multiplexer (MUX1), select one of the selected first multiplexer (MUX1), a specific sensor for the analog output signal from the pad 110 which is output from-passed to digital converter (ADC) do.

That is, the first multiplexer (MUX1) and a second multiplexer (MUX2), a sensor pad 110, an analog signal output from which is selected by - are input to digital converter (ADC). The analog-to-digital converter (ADC) converts, amplifies or digitizing the signal, that is, the voltage change difference output from the sensor pad 110, a memory unit; can be stored in (230, see FIG. 3).

5 is a circuit diagram showing in detail an arrangement of a drive circuit 211 of the touch detection unit 210, FIG. 6 is an exemplary waveform of the touch detection unit 210, for explaining the operation of the driving circuit 211.

5, the driving circuit 211 is connected to a sensor pad 110 through the signal wiring 120, the transistor (Ts), the parasitic capacitor (Cp), a drive capacitor (Cdrv) to a switching operation, and a common voltage capacitor (Cvcom).

A transistor (Ts), the parasitic capacitor (Cp), the drive capacitor (Cdrv), the common voltage capacitor (Cvcom) has a sensor pad 110 and the signal wiring can be achieved, one group per 120, the next sensor pad 110, It is referred to as the signal line 120, a transistor (Ts), by adding the parasitic capacitor (Cp), the drive capacitor (Cdrv) and the common voltage capacitor (Cvcom) "touch-sensing unit (touch sensing unit)". The touch sensing unit is a concept including a case in which the respective components electrically coupled by a multiplexer.

A signal line 120 at 5 is the drive circuit 211 and the sensor, but shown as being directly connected to between the pads 110, the signal line 120 is wired a plurality of signals respectively associated with the plurality of sensor pads 110 ( 120) of the first multiplexer (MUX1; may be one selected by the Fig. 4).

Meanwhile, the embodiment of the present invention, refers to the electrical characteristics or data values ​​when the touch has not occurred as "non-touch threshold (non-touch reference value)".

The numeral that follows, for convenience the capacitor and its capacitance is used in the same manner.

A transistor (Ts), for example a field effect transistor (field effect transistor), a gate (gate) is applied to a control signal (Vg), the source (source) is to be applied to the charging signal (Vb) and a drain (drain ) it may be connected to the signal wiring 120. the Of course, the source may be applied is connected to the signal wiring 120 and the charging signal (Vb) to a drain. A control signal (Vg) and the charge signal (Vb) may be controlled by the controller 240, other elements capable of switching operations instead of the transistor (Ts) may be used.

The parasitic capacitance (Cp) is a type of parasitic capacitance formed by the capacitance to mean a sensor that is attached to the pad 110, the sensor pad 110, the signal line 120. The parasitic capacitance (Cp) may include any parasitic capacitance generated by the touch detection unit 210, a touch panel, a video display device.

Common voltage capacitance (Cvcom) is the capacitance formed between the touch panel 100 (not shown), a common electrode of the display apparatus when it is mounted on the display device (not shown) such as an LCD and a touch panel 100, to be. A common electrode, the common voltage (Vcom) of a square wave and the like are applied by the display device. The common voltage capacitance (Cvcom) even if there is no noted for some kind of parasitic capacitance can be included in the parasitic capacitance (Cp) as, or less common voltage capacitance (CVcom) common voltage capacitance (Cvcom) is a parasitic capacitance ( It will be described as being included in the Cp).

Driving capacitance (Cdrv) is a capacitance formed in the path for supplying the alternating voltage (Vdrv) alternating with each sensor pad 110, a predetermined frequency. An alternating voltage (Vdrv) applied to a drive capacitor (Cdrv) is preferably a square-wave signal. An alternating voltage (Vdrv) is the duty ratio (duty ratio) may be the same clock signal, but be different duty ratio. An alternating voltage (Vdrv) is, but may be provided by a separate alternating-voltage generating means, it is also possible to use a common voltage (Vcom).

On the other hand, touch capacitance (Ct) in Fig. 5 is shown the user and the capacitance formed between the touch input tools, such as the sensor pad 110 and the user's finger if a touch sensor pad 110.

Referring to Figure 6, the charging signal (Vb) and a control signal (Vg) is applied to each of the source and the gate of the transistor (Ts).

[0135] Firstly, with respect to the touch when the insertion tool to the sensor pad 110 is not a touch (non-touch). After the charging signal (Vb) is, for example, up to 5V, then rises to a high voltage (VH) and a control signal (Vg) applied to the gate of the transistor (Ts) at a low voltage (VL) as the transistor (Ts) turns on the first charging the interval (T1) is started. Accordingly, the sensor pad 110 is filled with a charge signal (Vb) of 5V, the output voltage (Vo) is the terminal voltage (Vb). In the parasitic capacitor (Cp), the drive capacitor (Cdrv) and the common voltage capacitor (Cvcom) and an electric charge is charged by the charging voltage (Vb). First charging period (T1), so the transistor (Ts) is turned on, an alternating voltage (Vdrv) does not affect the output voltage (Vo).

Next, when the control signal (Vg) is going down from the high voltage (VH) to a low voltage (VL) a first sensing period (T2) is started and the transistor (Ts) is turned off, the touch capacitor (Ct), the parasitic capacitor (Cp) , a drive capacitor (Cdrv) and the common voltage capacitor (Cvcom) is isolated in a charged state. At this time, the output terminal of the sensor pad (110) to isolate the electric charge charged in stable can have a high impedance.

A state in this manner is isolated the electric charge charged like sensor pad 110 is referred to as a floating (floating) state. At this time, When the alternating voltage (Vdrv) is lowered is applied to the driving capacitors (Cdrv), a phenomenon that the voltage (Vo) at the output level of the sensor pad 110 is momentarily drop to occur. In the second detection period, as shown in (T4), when the alternating voltage (Vdrv) is raised in a floating state of the sensor pad 110, a voltage (Vo) level at the output sensor pad 110 is instantaneously boost . At this time, the rise and drop of the voltage (Vo) level will have a different value according to the connected capacitance. So the developer is increased value or falling value of the voltage level, which changes according to the connected capacitance is also referred to as "kick-back".

If the sensor pad 110 without a touch, that is, is connected to a sensor pad 110, the capacitor not only the driving capacitor (Cdrv) and the parasitic capacitor (Cp), the output voltage (Vo) due to these capacitors (Cdrv, Cp) of voltage change (ΔVo1) is shown in equation 1 below.

Equation 1

Figure PCTKR2013004925-appb-M000001

Wherein VdrvH VdrvL and is a high-level voltage and low level voltage of the alternating voltage (Vdrv) respectively. ΔVo1 of Equation 1, so corresponding to the electrical property of the sensor pads 110 that the touch does not occur, and can be set to "non-touch reference value" mentioned above.

Next, look at a case that a touch input tool to the sensor pad 110 of the touch.

In addition to when the touch occurs it is formed with a touch capacitor (Ct) between the sensor pad 110 and the touch input tool, whereby the sensor pad capacitor connected to the unit 110 drives the capacitor (Cdrv) and the parasitic capacitor (Cp) in accordance with the touch capacitor ( Ct) it is added. Voltage change (ΔVo2) of the sensor pad 110 according to the three capacitors (Cdrv, Cp, Ct) in the sensing period (T4) after the charging interval (T3), like the above-described method is equal to the following expression (2).

Equation 2

Figure PCTKR2013004925-appb-M000002

Voltage change (ΔVo2) in the case where the equation (1) and by comparing the equation (2), since the addition of the touch capacitance (Ct) in the denominator item of Equation (2), in the end, touch the voltage change when there is no touch ( smaller than the ΔVo1), the difference is dependent on the touch capacitance (Ct).

Thus, the difference (ΔVo1 - ΔVo2) of the touch before and after the voltage variation (ΔVo) of the referred to as "level-shift". In the present specification which may be a "level-shift" means a digital value of the voltage variation (ΔVo) difference.

If, the second detection period (T 4) at a voltage level (Vo) at an output end of the touch input did not generate the sensor pads 110, but changes to 7.5V 5V in accordance with the equation (1), a touch input occurs as the voltage level (Vo) at the output end of the sensor pad 110 is a 6V. In other words, voltage level (Vo) at the output end of the sensor pad 110 of the touch event of a touch as compared to the case of the US it can be seen that a shift from 7.5V to 6V. Therefore, by detecting such a level shift may obtain the touch signal.

A third voltage of the filling stage (T 5), the sensor pad 110 voltage (Vo) at an output terminal a and the re-5V of the third detection process (T 6), the so while the touch input generated alternating voltage (Vdrv) the output voltage (Vo) of the level sensor pad 110 is moved down to when this is lowered to 3.33V according to the equation (2). That is, in the rising period of the touch input in case of alternating voltage (Vdrv) and the voltage (Vo) is shifted to the lower level in the falling period of the alternating voltage (Vdrv) is shifted to a voltage level (Vo) with the top.

On the other hand, the capacitance (C) of the capacitor as C = ε * A / d, is proportional to the area (A) of the electrodes and inversely proportional to the distance (d) between the electrodes (ε is the dielectric constant). Therefore, the larger the touch area the greater the touch capacitance (Ct). And as shown in Figure 6, when the transistor (Ts) is the turn-off sensing that interval (T 2, T 4, T 6) fluctuations in the alternating voltage (Vdrv) applied to a drive capacitor (Cdrv) from generating an output the voltage change of the voltage (Vo) is generated. In this use the same relationship, by using the difference (ΔVo1- ΔVo2) of the voltage variation (ΔVo) of the touch before and after the output voltage (Vo) can be calculated if the touch and the touch area.

Referring back to FIG. 4 and 5, it is possible to detect the level shift caused by the alternating voltage (Vdrv) in a floating state from the output voltage (Vo) of the sensor pad (110). This level shift detector for detecting a level shift (not shown) may be additionally provided in the touch detection unit 210. Specifically, the output voltage (Vo) of the sensor pad 110 is analog-to-can be converted to a digital signal by analog to digital converter (ADC), the level shift detector is the output voltage at the sensor pad 110 when a touch not occurred a (Vo) of the variation (ΔVo1) and a touch event of the sensor pads 110, the variation (ΔVo2) of the output voltage (Vo) determined by the level shift can be detected whether in the occurrence. That is, the sensor potential of the pad 110 there is elevated or lowered by the applied alternating voltage (Vdrv), the voltage level change when a touch is generated has a value less than a voltage level change when a touch is not generated. Therefore, the level shift detector may detect a level shift by comparing the output voltage (Vo) level immediately after the increase of the alternating voltage (Vdrv) in a floating state. If at this time the level shift non-zero value, because a touch has occurred may be used for the level shift value as a touch signal. On the other hand, when the alternating voltage (Vdrv) falling occurs first in the floating state, it may be detected by comparing the level shifted output voltage (Vo) of the level immediately after falling.

To 4 according to the touch detection device is shown for the touch detection on the M × N of the sensor pad 110 this time, and the signal conversion time to be stabilized during occur the charge, the kickback phenomenon for each sensor pad 110 need. That is, the first multiplexer (MUX1) and a second performing a touch detection for one of the sensor pads 110 that are selected by the multiplex (MUX2), and then operates to perform touch detection on the other sensor pad 110 It must take place in this order.

7 is a view for explaining the time required to detect the touch of a diagram showing a touch detection pad, the sensor 110, the output terminal voltage change of the sensor pad 110, a sensor pad 110

7, a single sensor pad to the touch detection on the (110), the sensor pads 110, charge and time (Ta), kickback occurs in the prior occur kickback phenomenon after plotting the sensor pad 110 output voltage is the time for returning to a normal state (Tb), is converted to a digital signal needs time (Tc) that the level shift is detected.

In order to detect the touch on the sensor pad 110 it requires a process for detecting a kickback condition in accordance with the alternating voltage (Vdrv) change in the process, and the floating state of the floating after filling. It was then charged floating, the time until immediately before the kick-back observed in accordance with the alternating voltage (Vdrv) changes, it is assumed Ta la.

On the other hand, in a floating state, that is, the sensing period of the sensor pad 110, an alternating voltage (Vdrv) is as if falling there is generated sensor pad 110 output the kick-back the voltage drops, the voltage instantaneously drops to a steady state To return requires a certain amount of time. The minimum time required is needed a total resistance (R) and multiplied by the time constant (τ) or more, at least five times the time 5τ Since the value represented by the total capacitance (C) as viewed from the output terminal of the sensor pad (110). Time (Tc) is converted into a digital signal which the touch determining whether the analog to digital converter; the time at which the analog signal is detected is changed later, the level shift detector for level shift by a digital signal by a (ADC see Fig. 4).

A sensor because of Ta + Tb + Tc for touch detection on the pad 110 takes time, in order for the touch detection on the touch panel that includes two sensor pads 110, M × N × (Ta + Tb + it requires time tc).

Sensor charge and time (Ta) is from about 10㎲, analog to the floating after kickback immediately before the pad 110-to-digital converter (ADC) the level shift detection time (Tc) by the signal conversion and level shift detector by about 2 it can be assumed to ㎲. The time (Tb) when returning to the normal state is generated kickback touch detection unit; the longer the more distant sensor pad (110) from (210, see FIG. 4). Calculation of the time it takes to detect a touch on the touch-detection unit 210 and the nearest sensor pad 110 10㎲, the furthest sensor pad 110, the entire sensor pad 110, an average value thereof, assuming a 50㎲ It can be used as a variable.

That is, the time it takes to detect a touch on the touch panel including the M × N of the sensor pad 110 is equal to the following equation (3).

Equation 3

Figure PCTKR2013004925-appb-M000003

In the present invention utilizes the following: a touch detection method, such as to reduce the touch detection time.

8 is a flow chart illustrating a touch detection method according to an embodiment of the invention.

4 and 8, a touch panel 100 including the M × N of the sensor pads 110, one by one M-sensor pad 110, each signal wiring 120 belonging column It is connected to the first multiplexer (MUX1). Figure 4 but illustrated as being one of the first multiplexer (MUX1) is connected through the sensor pad 110 and the signal wiring 120 included in one column, but not limited to, a first multiplexer (MUX1) is one be connected with the sensor pad 110 included in the line of, and contrast, can be associated with different random sensor pad 110 is selected. That is, the first multiplexer (MUX1) is enough when it is connected through a plurality of sensor pads 110 and the signal wiring 120. Hereinafter it will be described by assuming that the first multiplexer (MUX1) is connected with the sensor pad 110 that belong in a column.

In this case, the first multiplexer (MUX1) is provided as the number of columns of the sensor pads 110 that are arranged in a matrix form of M × N. In the example shown in Figure 4 it may be provided with N number of the first multiplexer (MUX1).

Each first multiplexer (MUX1) selects one of the M sensor pad 110 is connected to M signal lines 120, which. That is, so-to-one multiplexer (MUX1), by selecting one of the M channels, all N first multiplexer (MUX1) to select a sensor pad 110, one for each (S810).

N number of first after the charging at the same time on the N sensor pad 110 is selected respectively by the first multiplexer (MUX1), and applies the alternating voltage to the level variable periodically in maintaining a floating state (S820).

When applying an alternating voltage generating the kickback phenomenon of the alternating voltage level changes, the output voltage value of the sensor pad 110 accordingly is input to the second multiplexer (MUX2). For such kickback phenomenon associated with the charging, is floating, and the alternating voltage of the sensor pad 110 is the same as described with reference to Figures 5 and 6, the description will be omitted. Input to a first multiplexer, one of the sensor pads 110, since the output voltage is input to the second multiplexer (MUX2), N-number of sensor pad 110 is an output terminal voltage is a second multiplexer (MUX2) per (MUX1) It is (S830).

A second multiplexer to the entered (MUX2) N of sensor pads 110, the output voltage value is output one by one and are converted to digital signals by analog to digital converter (ADC) (S840). The converted signal is utilized to detect the level shift, and determining whether the touch sensor pad caused by 110 therethrough by the level shift detector (S850). That is, the output voltage of N sensor pad 110, and sequentially converted into a digital signal, is utilized to detect the level shift, and determining whether the touch occurs therethrough.

For the level shift detecting the touch occurrence determination method through them is the same as described above with reference to FIGS. 5 and 6 will be omitted and a detailed description.

According to such a touch detection method, the time N number of sensor charging process for the pad 110 and then the floating alternating voltage is applied and this process to obtain the output voltage change value according therefore achieved at the same time, the touch of the entire touch panel 100, the time taken to detect the process is reduced.

Specifically, the sensor the time of rising the kickback phenomenon until after the was charged and the floating pad 110 Ta, kickback occurs when the sensor pad 110, the output voltage is converted to a time for returning to a normal state to Tb, a digital signal If that Tc for the time that a level shift is detected, the touch detection time for the entire touch panel 100 including the M × N of the sensor pad 110 is a (Ta + Tb + N * Tc) × M, Ta, when Tb, assignment of any value, for example in the expression (3) to Tc, may be as a result expressed by the following equation (4) of the.

Equation 4

Figure PCTKR2013004925-appb-M000004

Compared to equation (3) and Equation (4), when using a touch detection method according to the invention, M (N-1) {10㎲ + (50㎲ + 10㎲) / 2} The time can be reduced as much as have.

Table 1 below is a table comparing the conventional method for detecting a touch and the touch detection time between the touch detection method according to an embodiment of the invention.

Table 1

240 Channel Case 390 Channel Case unit
Traditional methods The present invention method Traditional methods The present invention method
N 12 12 15 15 ea
M 20 20 26 26 ea
Pre setting time 10 10 10 10
Settling time 1st row 50 50 65 65
Settling time Nth row 10 10 10 10
ADC time 2 2 2 2
One frame sensing time 10.08 1.28 19.305 2.015
Frame rate 99 781 52 496 Hz

The sensor pads 110 and 240. If individual, if 390 individuals was assumed, respectively. In the table, "Pre setting time", "ADC time" is a variable that refers to each of Ta and Tc in Fig. In addition, "Settling time 1st row" is a time corresponding to Tb of the first multiplexer (MUX1) and the most distant sensor pad 110 of the touch detection unit (210), "Settling time Nts row" a touch detector (210 ) of the time corresponding to Tb of the first multiplexer (MUX1) and the nearest sensor pad 110.

On the other hand, "One frame sensing time" means the time it takes to detect a touch on the touch panel and overall, "Frame rate" denotes the number of possible touch detection for the 1 second touch panel.

As can be seen in Table 1, M-sensor pad 110 and grouped by floating at the same time after charging the, by obtaining the sensor pad 110, the output voltage of the alternating voltage applied at the same time, for the entire touch panel 100, a touch detection time is decreased dramatically.

Embodiment according to the invention described above are implemented for example in the form of a program that may be performed through a variety of computer components, the command can be recorded in a computer-readable recording medium. The computer readable recording media may also include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on a computer-readable recording medium may be one well-known and available to those skilled in things or computer software, and specifically designed for the present invention. Examples of the computer readable recording medium, such as hard disks, floppy disks, and magnetic tape media, CD-ROM, such as an optical recording medium, flop tikeol disk (floptical disk) such as DVD magneto-optical medium (magneto-optical storing program instructions, such as media), and ROM, RAM, flash memory, hardware devices that are specially configured to, perform. Examples of program instructions include, the use of such as both machine code, such as produced by a compiler, interpreter to contain higher level code that may be executed by a computer. The hardware devices may be configured to act as one or more software modules in order to perform the process according to the invention, and vice versa.

While the invention has been above described by the specific details and exemplary embodiments and drawings, such as specific components, which is only be provided to assist the overall understanding of the invention, the present invention is not limited to the above embodiments , those of ordinary skill in the art can be achieved with various changes and modifications to the described.

Accordingly, the scope of the invention is jeonghaejyeoseo is not restricted to the embodiment described above, in all, as well as the claims, which will be described later patent equivalents and claims as, or equivalently modified ones scope of the spirit of the invention I will say.

Claims (8)

  1. In the touch detection method for a touch panel including a sensor pad to be placed in isolation from each other,
    Selecting a plurality of the sensor pad;
    Obtaining a signal outputted in response to the alternating voltage supplied by the floating state after charging of the plurality of sensor pads the selected at the same time; And
    Touch detecting method comprising the step of converting into a digital signal an output signal obtained at the same time from the plurality of sensor pads sequentially.
  2. According to claim 1,
    The plurality of sensor pads selecting step,
    A plurality of multiplexers that are connected via one or more wires and a sensor pad signal comprises selecting the one of the sensor pads, touch detection method.
  3. 3. The method of claim 2,
    The sensor pads are arranged in a matrix form of M × N, wherein the plurality of multiplexers, the touch detecting method implemented by the N multiplexers being connected to the M number of sensor pads, respectively.
  4. According to claim 1,
    The signals obtained at the same time from a plurality of sensor pads is selected by a multiplexer for performing the analog conversion, the touch detecting method is sequentially input to the digital converter.
  5. According to claim 1,
    Through the transformed signal based on the voltage variation of the difference in the sensor pads according to the alternating voltage and in case of non-touch occurs further comprises the step of detecting a touch, whether a touch detection method.
  6. A touch detecting device on the touch panel including a sensor pad to be placed in isolation from each other,
    A plurality of first multiplexers for selecting a plurality of sensor pads, respectively;
    A second multiplexer for receiving the signal output in response to a charge of a plurality of sensor pads is selected by the first multiplexer alternating voltage supplied by the floating state at the same time; And
    A touch detection apparatus comprising a digital converter for converting the analog signal to be sequentially output from the second multiplexer into a digital signal.
  7. 7. The method of claim 6,
    The sensor pads are arranged in a matrix form of M × N, wherein the first multiplexer is implemented open-circuit N, the touch detecting device is connected to the M number of sensor pads, respectively.
  8. 7. The method of claim 6,
    A touch detection unit via the converted signal on the basis of the voltage variation in the difference between the sensor pads according to the alternating voltage and in case of non-touch event of further comprising a level shift detector for detecting a touch or not.
PCT/KR2013/004925 2012-06-04 2013-06-04 Touch detection method and apparatus WO2013183917A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR10-2012-0060010 2012-06-04
KR20120060010 2012-06-04
KR20120122449A KR101482931B1 (en) 2012-06-04 2012-10-31 Touch detection method and apparatus
KR10-2012-0122449 2012-10-31

Publications (1)

Publication Number Publication Date
WO2013183917A1 true WO2013183917A1 (en) 2013-12-12

Family

ID=49712262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/004925 WO2013183917A1 (en) 2012-06-04 2013-06-04 Touch detection method and apparatus

Country Status (1)

Country Link
WO (1) WO2013183917A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018070559A1 (en) * 2016-10-11 2018-04-19 주식회사 트레이스 Sensing device and sensing method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080218494A1 (en) * 2003-02-10 2008-09-11 N-Trig Ltd. Touch detection for a digitizer
US20090273573A1 (en) * 2006-07-06 2009-11-05 Apple Inc. Mutual capacitance touch sensing device
KR20120027412A (en) * 2009-05-29 2012-03-21 쓰리엠 이노베이티브 프로퍼티즈 컴파니 High speed multi-touch touch device and controller therefor
US20120075240A1 (en) * 2010-09-29 2012-03-29 Sony Corporation Display unit with touch detection function and electronic unit
US20120086666A1 (en) * 2010-10-12 2012-04-12 Cypress Semiconductor Corporation Force Sensing Capacitive Hybrid Touch Sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080218494A1 (en) * 2003-02-10 2008-09-11 N-Trig Ltd. Touch detection for a digitizer
US20090273573A1 (en) * 2006-07-06 2009-11-05 Apple Inc. Mutual capacitance touch sensing device
KR20120027412A (en) * 2009-05-29 2012-03-21 쓰리엠 이노베이티브 프로퍼티즈 컴파니 High speed multi-touch touch device and controller therefor
US20120075240A1 (en) * 2010-09-29 2012-03-29 Sony Corporation Display unit with touch detection function and electronic unit
US20120086666A1 (en) * 2010-10-12 2012-04-12 Cypress Semiconductor Corporation Force Sensing Capacitive Hybrid Touch Sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018070559A1 (en) * 2016-10-11 2018-04-19 주식회사 트레이스 Sensing device and sensing method

Similar Documents

Publication Publication Date Title
US10042482B2 (en) Touch controller having increased sensing sensitivity, and display driving circuit and display device and system having the touch controller
US8451234B2 (en) Display device with touch panel
US9035900B2 (en) Touch detector and method of driving the same, display with touch detection function, and electronic unit having plural different drive electrodes
US8093914B2 (en) Compensation circuit for a TX-RX capacitive sensor
CN103518181B (en) Touch detection device and detection method, a touch screen panel, the display device
CN102236465B (en) Touch detection means and the display device circuit with a touch detection function, the electronic unit
KR101383709B1 (en) Display device and driving method thereof
KR101361341B1 (en) Integrated touch screen
JP5722573B2 (en) The display device with a touch detection function
EP2111572B1 (en) Simultaneous sensing arrangement
US7936340B2 (en) Display device and sensing signal processing apparatus
US8134535B2 (en) Display device including integrated touch sensors
CN101893777B (en) Display apparatus and touch detection apparatus
KR101008144B1 (en) Screen input type image display system
CN102736789B (en) A display panel driving method thereof, and an electronic driving circuit unit
KR101783485B1 (en) Touch detecting function display apparatus, driving circuit, driving method of touch detecting function display apparatus and electronic equipmnent
JP5667960B2 (en) Display device, the touch detection device, and electronic apparatus
US9772731B2 (en) Touch detection device, touch detection method and touch screen panel, using driving back phenomenon, and display device with built-in touch screen panel
JP4560031B2 (en) Touch-panel liquid crystal display
EP0843278B1 (en) Display-integrated type tablet device
US9690424B2 (en) In-cell multi-touch display panel system
CA2006038C (en) Tablet integrated with display
CN102612676B (en) The touch input recognition method and apparatus
US8791916B2 (en) Display panel with touch detection function, method of driving the same, driving circuit, and electronic unit
US8619057B2 (en) Signal processing circuit for electrostatic capacitor type touch sensor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13801173

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13801173

Country of ref document: EP

Kind code of ref document: A1