KR101620830B1 - A calibration method for increasing the touch of a capacitive touch sensor sensitivity of the self capacitance - Google Patents
A calibration method for increasing the touch of a capacitive touch sensor sensitivity of the self capacitance Download PDFInfo
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- KR101620830B1 KR101620830B1 KR1020150157169A KR20150157169A KR101620830B1 KR 101620830 B1 KR101620830 B1 KR 101620830B1 KR 1020150157169 A KR1020150157169 A KR 1020150157169A KR 20150157169 A KR20150157169 A KR 20150157169A KR 101620830 B1 KR101620830 B1 KR 101620830B1
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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
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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
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Abstract
Description
The present invention relates to a calibration method, and more particularly, to a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor.
In general, a touch screen panel is a screen equipped with a special input device for receiving a position of a touch when the touch is performed by a hand, Refers to a screen that allows the user to directly input data on the screen so that the user can grasp the position of the hand or object and perform specific processing by the stored software.
Such a touch screen panel performs a function by adding a device called a touch sensor to a screen of a general monitor or a mobile device. The touch sensor uses a transparent electrode functioning as Tx and Rx to generate a plurality of rectangular lattices, and an electric field between Tx and Rx is formed in each lattice. A change in the electric field when touching this grid with a fingertip or other object (stylus pen) causes a change in capacitance, and it has the function of detecting the change and detecting the contact position. Therefore, if a character or picture information displayed in advance on the screen equipped with the touch sensor is touched by hand, it is possible to grasp what the user has selected in accordance with the position of the contacted screen, So that the user can obtain desired information. Due to the characteristics of the touch screen panel, it is widely used in public places such as a subway, a department store, a bank, and the like, and is widely applied to terminals for sale in various shops. .
Recently, mobile devices such as smart phones, which are rapidly spreading, are implementing various functions by applying touch sensors. A touch sensor recognizes a touch by using a resistance film method or a capacitance method. Until 2008, the resistance film method has been widely used because it is inexpensive in terms of economy, but recently, it has been replaced with a capacitive type which has durability, sharpness and multi-touch capability in almost all devices.
The capacitive touch screen panel uses a capacitance in the body of a person to measure a change in resistance and current caused by a capacitance of a person using an AC voltage to recognize a touch, And a method of judging the presence or absence of touch by comparing the amount of charge. Such a capacitive touch screen panel has excellent durability as compared with a resistive film type using a film, so that it does not interfere with moisture or small damage. In addition, the accuracy of the touch is relatively high, the optical characteristic is excellent, and the screen is clear. In particular, the touch screen panel using the electrostatic capacity charging method is widely used in mobile smart devices because it can recognize multi points and can be manufactured in a small size.
The capacitance type touch panel mainly uses ITO (Indium Tin Oxide), and the touch signal is sensed by using ITO as a transparent electrode on the cover window. At this time, a method of sensing a touch signal and detecting a position by using two layers of transparent electrodes is used, and this method is known as the most convenient and safe touch method. Further, various researches are being conducted in a single-layer system for achieving the same effect as using two layers using only one transparent electrode layer.
The terminal equipped with the touch screen performs TSP calibration to match the hardware position displayed on the touch screen panel and the software position input by the user. Conventional schemes for calibration use current or constant capacitors. In the case of such a method of calibrating using a current or a constant capacitor, there is a problem that the current drive circuit and the capacitor are built in the terminal device and occupy a large area. This causes a problem in that the product size of the terminal device is affected, As shown in FIG. That is, the conventional calibration method has a problem in that a complicated additional circuit such as a current drive circuit and a capacitor is separately provided in the product of the terminal device in order to carry out the calibration of the touch screen panel.
The present invention has been proposed in order to solve the above-mentioned problems of the previously proposed methods. The present invention proposes a method in which a Tx signal is applied to a specific channel composed of one node, By allowing the counter-phase signal to be input and the calibration to cancel the charge of Cs by the parasitic capacitance Cm generated between the specific channel and the adjacent channel can be performed, It is an object of the present invention to provide a calibration method for increasing the touch sensitivity of a self-capacitance touch sensor, which enables a calibration to be performed more easily than a calibration using a complicated circuit that cancels the charge of Cs by another path through an external circuit do.
Further, according to the present invention, after the calibration process is performed, the touch sensitivity formed on the channel by the touch is detected, the opposite phase signal is further input to the channel of the opposite node, and the parasitic capacitance Cm generated between the two patterns, And the touch sensitivity can be further increased by a subtraction method in which two values are subtracted. The calibration method for increasing the touch sensitivity of the self-capacitance touch sensor is also provided.
In addition, since the present invention does not include an existing additional circuit for calibration, it is possible to provide a self-capacitance touch sensor which can be easily realized as compared with existing methods having an additional circuit, It is another object to provide a calibration method for increasing the touch sensitivity.
According to an aspect of the present invention, there is provided a calibration method for increasing a touch sensitivity of a self-
A calibration method for increasing the touch sensitivity of a self-capacitance touch sensor,
(1) In the capacitive touch sensor in which a plurality of channels are sequentially arranged for sensing a touch position, a Tx signal is applied to a specific channel (CHO) composed of one node, and then the Cs );
(2) inputting a reverse phase signal of the Tx signal to an adjacent channel CH1 forming the same node as the specific channel CH0; And
(3) The charge generated in the Cs by the mutual capacitance generated between the specific channel CHO and the adjacent channel CH1 forming one node by the opposite phase signal in the step (2) And the calibration is performed in such a manner that the calibration is canceled.
Preferably,
(4) After the calibration in the step (3), if a touch occurs to the node of the specific channel CH0 and the adjacent channel CH1, the amount of charge of Cs increases in the specific channel CH0, The detected amount of charge is detected with touch sensitivity; And
(5) If an opposite phase signal is input to the adjacent channel CH1 after the detection of the touch sensitivity through the step (4), and a touch is made in that state, a difference between the specific channel CH0 and the adjacent channel CH1 The charge amount of the mutual capacitance generated between the two patterns is decreased and the touch sensitivity is increased by subtracting the two amounts.
Preferably, the capacitive touch sensor includes:
And a plurality of channels sequentially arranged for sensing the touch position, wherein two adjacent channels form one node.
More preferably, the one node comprises:
And the two channels may be formed as a pair of touch patterns.
More preferably, the capacitive touch sensor includes:
And may be formed in a single structure in which a plurality of channels are disposed on one conductive layer.
More preferably, the one node comprises:
It may be constituted of a right triangular magnetic pattern structure in which two channels are formed in pairs.
More preferably, the one node comprises:
And an isosceles triangular magnetic pattern structure in which two channels are formed in pairs.
More preferably, the one node comprises:
And a rectangular magnetic pattern structure in which two channels are formed in pairs.
According to the calibration method for increasing the touch sensitivity of the self-capacitance touch sensor proposed in the present invention, the charge of Cs generated by applying the Tx signal to a specific channel constituted by one node is supplied to the adjacent channel of the same node as the Tx signal (Cm) generated between the specific channel and the adjacent channel can be performed to cancel the charge of Cs, so that the capacitance of the capacitive touch sensor can be reduced to the IC internal circuit or separately So that the calibration can be performed more easily than in the case of using a complicated circuit which cancels the charge of Cs by another path through the external circuit of the Cs.
In addition, according to the present invention, after the calibration process is performed, the touch sensitivity formed on the channel by the touch is detected, the opposite phase signal is further input to the channel of the opposite node, and the parasitic capacitance Cm ) Is reduced, and the touch sensitivity can be further increased by a subtraction method that subtracts the two values.
In addition, since the present invention does not include an existing additional circuit for calibration, the present invention can be implemented not only in a simple manner but also in a miniaturization of a product size as compared with the existing method having an additional circuit.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a conceptual diagram for explaining an operation principle of a self-capacitance type and a mutual capacitance type of a general capacitive touch sensor;
BACKGROUND OF THE
3 is a flowchart illustrating a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention.
4 is a diagram illustrating calibration according to a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention.
5 shows the timing of the calibration process according to Fig.
6 is a diagram illustrating a touch sensitivity detection process of a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention.
7 is a diagram illustrating a process of increasing a touch sensitivity of a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.
In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.
FIG. 1 is a conceptual diagram for explaining the operation principle of the self-capacitance type and the mutual capacitance type of a general capacitive touch sensor. 1 (a) shows an operation principle of a self capacitance touch sensor. 1 (a), when a touch is applied to the TSP (Touch Screen Panel), a capacitance component is generated between the touched finger and the stylus pen and the TSP, The increase in the finger capacitance is the touch sensitivity. Fig. 1 (b) shows the operation principle of a mutual capacitance touch sensor. That is, as shown in FIG. 1 (b), an electric field is formed between Tx and Rx. When the touch is applied, the electric field decreases and the amount of charge flowing into Rx decreases. Touch sensitivity.
The calibration method for increasing the touch sensitivity of the self-capacitance touch sensor according to an embodiment of the present invention combines the principle of the self-capacitance type shown in FIG. 1 and the principle of the mutual capacitance type, So that calibration can be performed easily.
2 is a diagram illustrating a configuration of a capacitive touch sensor applied to a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an embodiment of the present invention. 2, a
FIG. 3 is a flowchart illustrating a calibration method for increasing a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention. FIG. FIG. 5 is a timing chart of the calibration process according to FIG. 4, and FIG. 6 is a timing chart of the self-capacitance touch according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating a method of detecting a touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention. FIG. FIG. 8 is a diagram illustrating a structure for explaining a process of increasing the touch sensitivity. 3, a calibration method for increasing the touch sensitivity of a self-capacitance touch sensor according to an exemplary embodiment of the present invention includes: applying a Tx signal to a specific channel CH0, A step S110 of generating an opposite phase signal of the Tx signal to the adjacent channel CH1 and a step S120 of inputting an opposite phase signal of the Tx signal to the adjacent channel CH1; and a step of performing a calibration in such a manner as to cancel the charge generated at Cs by Cm S130). When a touch is generated, a charge amount of Cs increases in a specific channel CH0, and the increased capacitance amount is detected as a touch sensitivity (S140), and the adjacent channel CH1 Phase signal is input and when the touch is made in this state, the amount of mutual capacitance generated between the two patterns decreases, and the touch sensitivity is increased by subtracting the two amounts S150) It may be configured by further comprising.
In step S110, as shown in FIG. 2, in the
In step S120, in order to cancel the charge generated in the Cs of the
In step S130, the Cm (Mutual Capacitance) generated between the specific channel (CH0) 11 and the adjacent channel (CH1) 11 forming one
In step S140, if a touch is generated in the
In step S150, after the detection of the touch sensitivity through step S140, an opposite phase signal is additionally input to the adjacent channel (CH1) 11, and when the touch is made in this state, The amount of mutual capacitance generated between the two
As described above, the calibration method for increasing the touch sensitivity of the self-capacitance touch sensor according to an embodiment of the present invention is characterized in that the charge of Cs is transferred to the external touch sensor through another path through the IC internal circuit or another external circuit Unlike the calibration method using a complex circuit that cancels out the offset, the touch sensitivity can be increased by a calibration method using a parasitic capacitance generated in a TSP (Touch Screen Panel).
The present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics of the invention.
10: Capacitive touch sensor
11: channel 12: node
S110: a charge is generated in Cs of a specific channel after a Tx signal is applied to a specific channel CH0;
S120: an opposite phase signal of the Tx signal is input to the adjacent channel CH1;
S130: the calibration is performed in such a manner as to cancel the charge generated in Cs by Cm
S140: When a touch is generated, the charge amount of Cs is increased in the specific channel CH0, and the increased amount of charge is detected as touch sensitivity
S150: When an opposite phase signal is input to the adjacent channel (CH1) and a touch is made in that state, the amount of mutual capacitance charge generated between the two patterns is decreased, and the touch sensitivity is increased Step
Claims (8)
(1) In the capacitive touch sensor 10 in which a plurality of channels 11 are sequentially arranged for sensing a touch position, a Tx signal A charge is generated in the Cs (Self Capacitance) of the specific channel 11 after the application of the charge;
(2) inputting a reverse phase signal of the Tx signal to an adjacent channel (CH1) (11) forming the same node (12) as the specific channel (CH0) And
(3) Cm (Mutual Capacitance) generated between the specific channel (CH0) 11 and the adjacent channel (CH1) 11 forming one node 12 by the opposite phase signal in the step (2) Gt; Cs < / RTI > is canceled by < RTI ID = 0.0 >
(4) If a touch occurs to the node 12 of the specific channel (CH0) 11 and the adjacent channel (CH1) 11 after performing the calibration of the step (3) ), The amount of charge of Cs is increased, and the increased amount of charge is detected as touch sensitivity; And
(5) If an opposite phase signal is input to the adjacent channel (CH1) 11 after the touch sensitivity is detected through the step (4), and the touch is made in that state, The step of decreasing the amount of mutual capacitance generated between the two patterns of the adjacent channels CH1 and 11 and increasing the touch sensitivity by subtracting two amounts,
The capacitive touch sensor (10)
And a plurality of channels (11) arranged in sequence for sensing the touch position, wherein two adjacent channels (11) are configured to form one node (12) Calibration method for increasing the touch sensitivity of the touch sensor.
Wherein the two channels (11) are formed as a pair of touch patterns.
Wherein the plurality of channels (11) are formed in a single structure in which a plurality of channels (11) are disposed on one conductive layer.
A method for calibration of a self-capacitance touch sensor for increasing touch sensitivity, characterized in that it comprises a right-angle triangular magnetic pattern structure in which two channels (11) are formed in pairs.
Characterized in that it is constituted by an isosceles triangular magnetic pattern structure in which two channels (11) are formed in pairs.
A calibration method for an increase in touch sensitivity of a self-capacitance touch sensor, characterized in that it has a rectangular magnetic pattern structure in which two channels (11) are formed in pairs.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11782552B2 (en) | 2019-01-07 | 2023-10-10 | Samsung Electronics Co., Ltd. | Capacitive touch panel and method of driving capacitive touch panel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101117328B1 (en) * | 2011-05-24 | 2012-03-20 | (주)이미지스테크놀로지 | A method for calibrating capacitor using touch screen panel |
| JP2013092872A (en) * | 2011-10-25 | 2013-05-16 | Sharp Corp | Touch panel system and electronic apparatus |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101117328B1 (en) * | 2011-05-24 | 2012-03-20 | (주)이미지스테크놀로지 | A method for calibrating capacitor using touch screen panel |
| JP2013092872A (en) * | 2011-10-25 | 2013-05-16 | Sharp Corp | Touch panel system and electronic apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11782552B2 (en) | 2019-01-07 | 2023-10-10 | Samsung Electronics Co., Ltd. | Capacitive touch panel and method of driving capacitive touch panel |
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