KR102025282B1 - Device and algorithm of single plate touch sensor - Google Patents

Device and algorithm of single plate touch sensor Download PDF

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KR102025282B1
KR102025282B1 KR1020150119705A KR20150119705A KR102025282B1 KR 102025282 B1 KR102025282 B1 KR 102025282B1 KR 1020150119705 A KR1020150119705 A KR 1020150119705A KR 20150119705 A KR20150119705 A KR 20150119705A KR 102025282 B1 KR102025282 B1 KR 102025282B1
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South Korea
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signal
channel signal
trace
channel
receiving
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KR1020150119705A
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Korean (ko)
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KR20170024433A (en
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이범우
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주식회사 엘지화학
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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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Abstract

The present invention controls a trace noise signal due to a decrease in touch sensitivity caused by a trace noise signal generated in a single-sided touch sensor having a structure (TRR structure) in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx. By providing an algorithm to provide a single-sided touch sensor with improved touch sensitivity.

Description

Single-sided touch sensor analysis device and algorithm {Device and algorithm of single plate touch sensor}

The present invention relates to a single-sided touch sensor, and to a single-sided touch sensor with improved sensitivity by controlling a trace noise signal.

The conventional touch screen sensor uses two electrode layers as a discrete position sensing touch sensor. Conventional touch position sensor, the vertical position sensing layer (Rx) for sensing the vertical position, the horizontal position sensing layer (Tx) and the vertical position sensing layer (Rx) and the horizontal position sensing layer (Tx) for sensing the horizontal position It consists of a shielding layer to block electrical noise for Such three layers may be stacked through an adhesive layer, and a transparent window may be stacked on the vertical position sensing layer Rx or the horizontal position sensing layer Tx via the adhesive layer.

The reason for configuring the horizontal position sensing layer Tx and the vertical position sensing layer Rx as separate layers in the conventional touch position sensing device is that the connection line is connected to an external circuit for detecting whether the contact is performed at each position. To minimize the number.

If the sensing regions are arranged at M positions horizontally and N positions vertically on the surface of a single film, the touch sensor circuit for detecting whether or not a contact is detected may have (M * N) counts to detect touches at each sensing region. A channel is needed. However, if the sensing patterns for sensing the horizontal position and the vertical position are separated to form separate sensing layers, only the (M + N) channels can detect the contact position of the entire area. Therefore, the conventional touch position sensing sensor is configured as a separate layer by separating the horizontal position sensing layer and the vertical position sensing layer in order to prevent the number of sensing areas from being limited by the number of channels of the touch sensor circuit for detecting whether or not a touch exists.

However, such a conventional contact position sensor has a plurality of sensing layers, and thus the thickness of the sensor is increased, and the first and second electrodes are formed by forming electrode patterning with a transparent conductive material such as ITO or a fine electrode. In the process of forming the pattern, since the expensive ITO or expensive process is used, the overall manufacturing cost of the conventional contact position sensor increases.

As an alternative to this, various researches are being conducted on the single-sided touch sensor having the same effect as using two layers using only one electrode layer.

Referring to FIG. 1, a structure of a general cross-sectional touch sensor is patterned. A plurality of receiving electrodes Rx and a plurality of driving electrodes Tx are patterned on a single surface.

Since the trace of Rx1 is invariably wired between Rx2 and Tx, when touch is generated in Rx2, the change of capacitance of Rx2 is detected as well as the change of capacitance in Rx1 trace and the sensitivity of the touch sensor is inferior. Occurred.

Conventional technology for solving such a problem was the Republic of Korea Patent KR-1285686.

The conventional technology is equipped with a separate receiver node, to prevent the malfunction of the touch through a specific compensation algorithm to the capacitance measured at the receiver node, and to improve the sensitivity of the touch.

However, the prior art requires a separate configuration for measuring capacitance at the receiver node, which causes a complicated configuration.

Korea Registered Patent KR-1285686

The present invention provides an algorithm for preventing a decrease in touch sensitivity due to a trace noise signal generated in a single-sided touch sensor having an electrode structure (TRR structure) in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx. It provides a single-sided touch sensor with improved touch sensitivity.

The present invention provides a cross-sectional touch sensor having an electrode structure in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx, wherein the capacitance change signals of the two receiving electrodes Rx1 and Rx2 are changed. A channel signal sensing unit for sensing, and a signal analysis unit for detecting the touch position from the capacitance change signal sensed by the channel signal sensing unit.

The channel signal detection unit includes an Rx1 channel signal detection module detecting a change in capacitance of Rx1, an Rx2 channel signal detection module detecting a change in capacitance of Rx2, and an Rx1 channel signal detected by the channel signal detection module of Rx1. Is a signal separated into an Rx1 signal and a Rx1 trace signal having a predetermined ratio.

The signal analyzer includes an Rx1 channel signal separation module for separating an Rx1 channel signal into an Rx1 signal and an Rx1 trace signal, an Rx1 trace signal changing module for changing an Rx1 trace signal according to an Rx2 signal or an Rx2 channel signal change ratio, and the changed Rx1 trace signal. And an Rx1 channel signal correction module for correcting the Rx1 channel signal by summing the Rx1 signals, and a coordinate analysis module for calculating touch coordinates based on the Rx1 channel signal, the Rx2 channel signal, and the changed Rx1 channel signal.

In the method for removing trace noise generated in the process of analyzing a signal of a single-sided touch sensor, a channel signal receiving step of receiving Rx1 and Rx2 channel signals and a signal deviating from a reference signal among the signals of the channel receiving step are detected. In this case, the Rx2 channel signal checking step of checking whether the Rx2 channel signal is included in the signal received in the channel receiving step, and the Rx2 channel value of the channel signal receiving step are not included in the Rx2 channel signal checking step. A touch coordinate analysis step of interpreting touch coordinates from a signal, an Rx1 channel signal correction step of converting the Rx1 channel signal into a corrected Rx1 channel signal when the Rx2 channel value is included in the Rx2 channel signal checking step, and the Rx1 channel signal It consists of a coordinate analysis step of confirming the touch coordinates from the result value of the correction step.

The Rx1 channel signal correction step includes: an Rx1 channel signal separation step of separating the Rx1 channel signal into an Rx1 signal and an Rx1 trace signal, an Rx1 trace signal conversion step of converting the Rx1 trace signal separated in the Rx1 channel signal separation step, and the trace signal A Rx1 signal summing step of summing the converted Rx1 trace signal and the Rx1 signal is performed.

The Rx1 trace signal conversion step is to reduce the Rx1 trace signal according to the rate of change of the value of the Rx2 signal.

The sensitivity of the touch sensor may be improved by removing trace noise generated in a single-sided touch sensor having an electrode structure in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx.

FIG. 1A illustrates one cell of an electrode structure in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx.
FIG. 1B is a diagram illustrating a plurality of cells of FIG. 1A connected.
2 is a block diagram according to an embodiment of the present invention.
3 is an algorithm according to an embodiment of the present invention.

The present invention proposes an algorithm for improving the touch sensitivity of a single-sided touch sensor having an electrode structure (TRR structure) in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention; However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

1A and 1B illustrate a cross-sectional touch sensor having a TRR structure, which is an electrode structure in which two Rxes 100 and 200 are coupled to one Tx 500.

1A and 1B, an Rx1 trace 110 is disposed between the Tx 500 and the Rx2 200. In the TRR structure, when a touch occurs in the Rx2 200 region, not only the change in capacitance is sensed at Rx2 but also the change in capacitance is sensed at the Rx1 trace 110, thereby causing a decrease in sensitivity of the touch.

Looking at the configuration of the present invention with reference to Figures 2a and 2b, the present invention is composed of a channel signal detection unit 300, a signal analysis unit 400.

More specifically, the channel signal detection unit 300 is composed of an Rx1 channel signal detection module 410 and an Rx2 channel signal detection module 420 for detecting capacitance changed when the touch is performed.

The Rx1 (100) and Rx2 (200) channel signals may be separated into Rx1 (100) and Rx2 (200) signals having predetermined ratio values, and Rx1 trace 110 and Rx2 trace (not shown) signals.

The Rx1 (100) and Rx2 (200) signals mean capacitance that changes when the Rx1 (100) and Rx2 (200) touch areas are touched, and the Rx1 trace 110 and Rx2 trace signals (not shown) The capacitance changes in the conductive line connecting the Rx1 (100) and Rx2 (200) touch regions.

In the Rx1 channel signal and the Rx2 channel signal, the Rx1 (100) signal, the Rx2 (200) signal, the Rx1 trace 110 signal, and the Rx2 trace signal (not shown) are the characteristics of the substrate, the width of the trace, the distance between the trace and the Tx. The ratios in the Rx1 channel signal and the Rx2 channel signal are determined to predetermined values, respectively, according to the design of those skilled in the art.

On the other hand, the signal analysis unit 400 is a coordinate analysis module 430 for interpreting the touch coordinates from the Rx1 (100) and Rx2 (200) channel signals, and the Rx1 (100) channel signal to the Rx1 (100) signal and the Rx trace ( Rx1 channel signal separation module 410 for decomposing the signal into a signal 110, an Rx1 trace change module 411 for changing the separated Rx1 trace 110 signal, and a corrected Rx1 signal based on the changed Rx1 trace 110 signal. 100) an Rx1 channel signal correction module 420 for generating a channel signal.

Meanwhile, in addition to the above configuration, the Rx2 channel signal separation module 420 may be further configured to decompose the Rx2 200 channel signal into an Rx2 200 signal and an Rx2 trace (not shown) signal.

More specifically, the Rx1 channel signal separation module 410 operates when the Rx2 (200) channel signal is detected by the channel detector 300 to convert an Rx1 (100) channel signal into an Rx1 (100) signal and an Rx1 trace ( 110) Separate by signal.

The Rx2 channel signal separation module 420 operates when the Rx2 200 channel signal is detected by the channel detector 300 to convert the Rx2 200 channel signal into an Rx2 200 signal and an Rx2 trace signal (not shown). To separate.

The Rx1 trace signal changing module 411 changes the Rx1 trace 110 signal separated from the Rx1 channel signal according to the Rx2 200 signal change ratio value.

The change value of the Rx1 trace 110 according to the rate of change of the Rx2 200 signal is set to a predetermined value based on experimental data according to the type of the touch sensor.

The Rx1 channel signal correction module 421 generates a corrected Rx1 (100) channel signal by summing the Rx1 trace 110 signal and the Rx1 (100) signal changed by the Rx1 trace signal changing module 411.

The corrected Rx1 (100) channel signal is interpreted as touch coordinates in the coordinate analysis module 430.

Hereinafter, the recognition algorithm of the single-sided touch sensor of the present invention will be described with reference to FIG. 3.

The algorithm of the present invention includes a channel signal receiving step (S1) for receiving a channel signal, a touch checking step (S2) for checking whether there is a channel signal deviating from the base, and an Rx2 checking whether the channel signal deviating from the base includes an Rx2 channel signal. In the channel signal checking step (S3), when the Rx2 channel signal deviating from the base is confirmed, the Rx1 channel signal separating step (S4) of separating the Rx1 channel signal coupled with the Rx2 into the Rx1 signal and the Rx1 trace signal (S4), and the separated Rx1 Rx1 trace change step (S5) of changing a trace signal, Rx1 channel signal correction step (S6) of adding the Rx1 signal and the changed Rx1 trace to obtain a corrected Rx1 channel signal, the Rx1 channel signal, Rx2 channel signal and corrected It consists of a touch coordinate analysis step S7 for calculating touch coordinates from the Rx1 channel signal.

In the channel signal receiving step S1, each channel signal is periodically received from a plurality of Rx constituting the touch sensor.

In the channel signal receiving step S1, when there is no touch in the touch sensor, each channel signal is measured as a value within a predetermined reference value range, and the value within the predetermined reference value range is called a base channel signal.

On the other hand, when a touch occurs in the touch sensor, the predetermined base channel signal is measured as a value outside the base channel signal value of the channel signal in the touch-produced region.

The channel signal checking step S2 determines Rx for transmitting a signal out of the base channel signal among the channel signals received in the channel signal receiving step S1.

On the other hand, the Rx2 (200) channel signal checking step (S3) is a step of determining whether the Rx2 channel is included, if it is determined that the Rx2 (200) channel signal is not included, the Rx1 (100) outside the base channel signal Step S7 of interpreting the channel signal is performed, and if it is determined that the Rx2 200 channel signal is included, steps S4 to 7 are performed.

The Rx1 channel signal separating step S4 is a step of separating the Rx1 (100) channel signal into an Rx1 (100) signal and an Rx1 trace 110 signal.

The reason for performing the Rx1 channel signal separation step (S4) for separating the Rx1 (100) channel signal into the Rx1 (100) signal and the Rx1 trace 110 signal is as shown in FIG. 1A. When the 110 is disposed between the Rx2 200 and the Tx 500 to generate a touch on the Rx2 200 portion, the Rx1 trace 110 signal is increased, and thus the Rx1 (100) channel signal is also increased. A problem occurred.

Therefore, in order to solve the problem that the Rx1 (100) channel signal is increased by the Rx1 trace 110 signal, the effect of the Rx1 trace 110 signal by separating the Rx1 trace 110 signal from the Rx1 (100) channel signal Remove it.

An Rx1 trace signal changing step of changing the separated Rx1 trace 110 signal in accordance with an Rx2 (200) signal or an Rx2 (200) channel signal change ratio as a method for removing the influence caused by the Rx1 trace 110 signal. (S5) and the Rx1 channel signal correction step (S6) for correcting the Rx1 channel signal from the modified Rx1 trace signal.

More specifically, when the Rx2 (200) channel signal is measured to be far from the base signal, it means that the Rx2 (200) area is touched more than the Rx1 (100) area. In this case, the Rx1 trace 110 is Rx2 (200). Because of the large value due to the touch of the region, the Rx1 trace 110 value is greatly reduced to correct the Rx1 (100) channel signal coupled to the Rx2 (200).

Meanwhile, when the Rx2 (200) channel signal is measured small, it means that the Rx1 (100) area is touched more than the Rx2 (200) area. In this case, the Rx1 trace 110 signal is larger than the Rx2 (200) channel signal. Since the value is smaller than the measured value, the value of the Rx1 trace 110 is decreased to compensate for the Rx1 (100) channel signal coupled with the Rx2 (200).

The touch coordinate analysis step S7 is a step of calculating coordinates in which a touch is generated from the Rx1 channel signal, the corrected Rx1 channel signal, and the Rx2 channel signal.

Hereinafter, an embodiment of the present invention will be described.

When a touch occurs in a TRR-type single-sided touch sensor in which two receiving electrodes Rx1 and Rx2 are coupled to one driving electrode Tx having a structure as illustrated in FIG. 1A, the Rx channel signal detector 300 Detect signals deviating from the base at).

When only the Rx1 (100) channel signal deviated from the base signal is detected by the Rx channel detector 300, and the Rx2 (200) channel signal deviated from the base signal is not detected, the coordinate analysis module of the signal analyzer 400 ( In operation 430, the touch position is recognized from the Rx1 (100) channel signal.

Meanwhile, when the Rx1 (100) channel signal and the Rx2 (200) channel signal are detected together from the base by the Rx channel detector 300, the Rx1 (100) channel signal is transmitted to the Rx1 channel signal separation module 410. Thus, the signal is separated into an Rx1 (100) signal and an Rx1 trace 110 signal having a predetermined ratio.

The separated Rx1 trace 110 signal is changed at a ratio determined by the size of the Rx2 signal or the Rx2 200 channel signal in the Rx1 trace change module.

More specifically, when a touch of 55% of the finger in the Rx1 (100) region and 45% of the finger in the Rx2 (200) region occurs, the Rx1 (100) channel signal is measured as 53 and the Rx2 (200) channel signal is Measured as 47, it is recognized that a touch has occurred in the Rx1 (100) region.

However, when a touch of 45% of the finger in the Rx1 (100) area and 55% of the finger in the Rx2 (200) area occurs, a lot of noise occurs in the Rx1 trace, so the Rx1 (100) channel signal is measured as 52 and Rx2 The case where the (200) channel signal is measured at 48 occurs. In this case, there is a problem in that a touch is incorrectly recognized in the Rx1 (100) region.

However, using the algorithm of the present invention, an Rx1 (100) channel signal having a value of 52 is divided into an Rx1 (100) signal having a value of 37 and an Rx1 trace 110 signal having a value of 15.

The Rx1 trace 110 signal is changed to 9, which is reduced by 40% by the change rate value of the Rx2 200 channel signal value in the Rx1 trace change module 411.

The Rx1 channel signal correction module 421 sums the existing Rx1 100 signal and the changed Rx1 trace signal and outputs a corrected Rx1 channel signal having a value of 46.

Accordingly, since the corrected Rx1 (100) channel signal has a value of 46 and the Rx2 (200) channel signal has a value of 48, the coordinate analysis module 430 recognizes that a touch has occurred in the Rx2 region.

On the other hand, although the technical spirit of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of explanation and not for the limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

100: Rx1 310: Rx1 Channel Detection Module
110: Rx1 trace 300: channel signal detector
200: Rx2 410: Rx1 Channel Signal Separation Module
320: Rx2 channel detection module 411: Rx1 trace signal separation module
400: signal analysis unit 420: Rx2 channel signal separation module
500: Tx 421: Rx1 Channel Signal Correction Module
430: coordinate analysis module

Claims (5)

A cross-sectional touch sensor having an electrode structure in which two first and second receiving electrodes Rx1 and Rx2 are coupled to each driving electrode Tx, wherein the two first and second receiving electrodes Rx1 and Rx2 are disposed. A channel signal detecting unit detecting a capacitance change signal;
A signal analyzer to determine a touch position from the capacitance change signal sensed by the channel signal detector;
It is configured to include,
The channel signal detector,
An Rx1 channel signal sensing module detecting a change in capacitance of Rx1;
An Rx2 channel signal sensing module sensing a change in capacitance of Rx2;
It is configured to include,
The driving electrode Tx and the two first and second receiving electrodes Rx1 and Rx2 are provided on the same plane.
The first and second receiving electrodes are provided spaced apart from one side of the driving electrode Tx by a predetermined interval,
A trace Rx1 trace of the first receiving electrode Rx1 is disposed between the driving electrode Tx and the second receiving electrode Rx2.
The signal analysis unit,
An Rx1 channel signal separation module for separating the Rx1 channel signal detected by the Rx1 channel signal detection module into an Rx1 signal and an Rx1 trace signal;
An Rx2 channel signal separation module for separating the Rx2 channel signal detected by the Rx2 channel signal detection module into an Rx2 signal and an Rx2 trace signal;
An Rx1 trace signal changing module for changing the separated Rx1 trace signal according to a degree of change of an Rx2 signal or an Rx2 channel signal from a base signal value;
An Rx1 channel signal correction module configured to correct the Rx1 channel signal by adding the changed Rx1 trace signal and the Rx1 signal;
A coordinate analysis module that calculates touch coordinates by using the corrected Rx1 channel signal;
Single-sided touch sensor signal analysis device, characterized in that comprising a.
delete The driving electrode Tx and the two first and second receiving electrodes Rx1 and Rx2 are provided on the same plane, and the first and second receiving electrodes are provided to be spaced apart from one side of the driving electrode Tx by a predetermined interval. In the method for analyzing the signal of the single-sided touch sensor having an electrode structure in which the trace (Rx1 trace) of the first receiving electrode (Rx1) is disposed between the drive electrode (Tx) and the receiving electrode (Rx2),
A channel signal receiving step of receiving the Rx1 and Rx2 channel signals;
When a signal deviating from a reference signal is detected among the signals of the channel signal receiving step,
An Rx2 channel signal checking step of checking whether an Rx2 channel signal is included in the signal received in the channel signal receiving step;
A touch coordinate analysis step of interpreting touch coordinates from the Rx1 channel signal of the channel signal receiving step when the Rx2 channel value is not included in the checking of the Rx2 channel signal;
An Rx1 channel signal correction step of converting the Rx1 channel signal into a corrected Rx1 channel signal when an Rx2 channel value is included in the Rx2 channel signal checking step;
A coordinate analysis step of confirming touch coordinates from the result value of the Rx1 channel signal correction step and the Rx2 channel signal;
It is configured to include,
The Rx1 channel signal correction step
Separating the Rx1 channel signal into an Rx1 signal and an Rx1 trace signal;
Separating the Rx2 channel signal into an Rx2 signal and an Rx2 trace signal;
An Rx1 trace signal conversion step of converting the Rx1 trace signal separated in the Rx1 channel signal separation step based on the Rx2 channel signal or the separated Rx2 signal;
An Rx1 signal summing step of summing the Rx1 trace signal and the Rx1 signal converted in the trace signal conversion step;
Single-sided touch sensor signal analysis method characterized in that it comprises a.
delete delete
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Publication number Priority date Publication date Assignee Title
KR101285686B1 (en) * 2012-09-14 2013-08-02 (주)이미지스테크놀로지 Touchscreen panel having one-layered structure of interference measurements of capacitance and remove

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US9927924B2 (en) * 2008-09-26 2018-03-27 Apple Inc. Differential sensing for a touch panel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101285686B1 (en) * 2012-09-14 2013-08-02 (주)이미지스테크놀로지 Touchscreen panel having one-layered structure of interference measurements of capacitance and remove

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