KR101664329B1 - Compensation Method of Force Sensing Capacitance and Force Input Sensing Apparatus using thereof - Google Patents
Compensation Method of Force Sensing Capacitance and Force Input Sensing Apparatus using thereof Download PDFInfo
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- KR101664329B1 KR101664329B1 KR1020150183662A KR20150183662A KR101664329B1 KR 101664329 B1 KR101664329 B1 KR 101664329B1 KR 1020150183662 A KR1020150183662 A KR 1020150183662A KR 20150183662 A KR20150183662 A KR 20150183662A KR 101664329 B1 KR101664329 B1 KR 101664329B1
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- capacitor
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- force
- sensing capacitor
- compensation
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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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
Abstract
Description
The present invention relates to a force sensing capacitance compensation method and a force input detection apparatus using the same.
Currently, sensing methods used in touch screens are mainly composed of resistive film type, surface ultrasonic type, and capacitance type. In case of capacitive type, multi-touch detection is possible and durability and visibility are excellent. And is adopted as an input means.
The capacitive touch screen recognizes the user input by sensing the change in the amount of charge charged on the capacitive sensors on the touch screen panel due to user intervention, and recognizes the user input by self-capacitive type according to the charge storage method. And mutual-capacitive. The self-capacitance scheme forms one conductor per capacitive sensor to form a reference ground and a charging surface outside the touch screen panel, while the mutual capacitive scheme provides two reference electrodes on the touch screen panel Of the electric conductors form a charging surface to function as one charging sensor.
A prior patent for such a capacitive touch sensitive panel is US Pat. No. 7,920,129.
The touch panel according to the related art has a function of detecting coordinates of a single or a plurality of touches by an object to which a touch input is applied, locus detection formed by touching the panel, object detection for hovering the touch panel, A force sensing device is added, or a force input provided by a user pressing the touch panel by the touch panel itself has been detected.
There is a method of detecting by using a change in capacitance value, as one of a method in which a user applies input to a force sensing device to detect an input. The capacitance value of an intrinsically inherent capacitor in a conventional force sensing device is larger than a capacitance change caused by a force input provided by a user. Capacitance values of parasitic capacitances and force sensing capacitors continue to increase with the progress of miniaturization and thinning of electronic products. However, since the capacitance variation caused by a user applying force to the touch panel is decreasing, It is becoming increasingly difficult to detect the signal with a degree of accuracy and sensitivity that can be ensured.
The present embodiment is for solving the problems of the above-mentioned prior art. One of the goals of this embodiment is to provide a method and apparatus that can improve the accuracy and sensitivity of input detection using a force sensing layer that can reduce the capacitance value of a capacitor inherently embedded in a force input device. One of the objects of the present embodiment is to provide a method and an apparatus that can compensate for the influence of the parasitic capacitance formed in the input providing means so as to enhance the accuracy and sensitivity of the input detection that the user applies to the input providing means.
The force input detecting device according to the present embodiment includes a cover window deformed by a force input provided from an object and a force detection layer which is one electrode of a force sensing capacitor whose capacitance value changes according to deformation of the cover window and a force input detecting unit for detecting a force input, wherein the force input detecting unit comprises: a compensation capacitor for compensating the force sensing capacitor; a switching unit for switching an electrical connection form of the force sensing capacitor and the compensation capacitor; And a detection circuit section that detects an electrical signal that changes in accordance with a change in the capacitance value of the force sensing capacitor.
(A) precharging a force sensing capacitor formed of a force sensing layer, a reference sensing electrode, and a compensation capacitor to a supply voltage, and (b) ) Performing a first charge sharing by serially connecting a positive-sense capacitor and a compensation capacitor between a supply voltage and a reference voltage, and (c) performing a first charge sharing with the positive-sense capacitor and the compensation capacitor Performing charge sharing on the first charge sharing voltage, and (d) outputting a second charge sharing formed voltage.
According to the present embodiment, there is provided an advantage that the force input can be detected with high accuracy and high sensitivity as compared with the prior art by compensating the capacitance value of the capacitor inherently embedded in the force input detecting device.
Fig. 1 (a) and Fig. 1 (b) are sectional views showing the outline of the force input detecting device according to the present embodiment, and Fig. 2 is a block diagram showing an outline of the force input detecting device according to the present embodiment.
3 is a diagram showing an outline of a force detection layer.
4 is a diagram showing an embodiment of the detection circuit section.
5 (a) is a view showing a state where a force sensing layer and a metal body are separated from each other, which is one electrode of a force sensing capacitor in a state where a force input is not provided, and FIG. 5 (b) A state of a sensing layer and a metal body.
6 is a flowchart schematically showing each step of the force detection capacitance compensation method according to the present embodiment.
7 is an exemplary timing chart showing control signals that the control unit provides to the switching unit.
FIGS. 8 and 9 are diagrams showing equivalent circuits for each phase in which the control unit drives the switching unit. FIG.
The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas.
Meanwhile, the meaning of the terms described in the present application should be understood as follows.
The terms " first ", " second ", and the like are used to distinguish one element from another and should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
It is to be understood that when an element is referred to as being "on" or "on" another element, it may be directly on top of the other element, although other elements may be present in between. On the other hand, when an element is referred to as being "in contact" with another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "intervening" and "intervening", between "between" and "immediately" or "neighboring" Direct neighbors "should be interpreted similarly.
It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.
Each step may take place differently from the stated order unless explicitly stated in a specific order in the context. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.
The drawings referred to for explaining embodiments of the present disclosure are exaggerated in size, height, thickness, and the like intentionally for convenience of explanation and understanding, and are not enlarged or reduced in proportion. In addition, any of the components shown in the drawings may be intentionally reduced, and other components may be intentionally enlarged.
All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Terms such as those defined in commonly used dictionaries should be interpreted to be consistent with the meanings in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless explicitly defined in the present application .
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 (a) and Fig. 1 (b) are sectional views showing the outline of the force input detecting device according to the present embodiment, and Fig. 2 is a block diagram showing an outline of the force input detecting device according to the present embodiment. 1 (a), 1 (b), and 2, the force input detecting device according to the present embodiment includes a
Hereinafter, the thing that a user can apply a force input to a force input detecting device is defined as an " object ". Such an object can mean an object, such as a finger or a palm, or a part of the user's body or a stylus, and means that the
1 (a) and 1 (b), the force input detecting device according to the present embodiment includes a
In one embodiment, the force input detection device may include a
In another example, the
In one embodiment, the
The
A
In the embodiment shown in FIG. 1 (a), the two electrodes of the force sensing capacitor Cf may be the
The capacitance value of the capacitor composed of two electrodes can be calculated as shown in
Referring to Equation (1), as the distance between the two electrodes approaches, the capacitance value increases. As the area of the electrode decreases, the capacitance value decreases. Therefore, the
Hereinafter, the inherent capacitance implies not only the capacitance of an intended formed capacitor but also the capacitance of an existing capacitor. For example, in the embodiment shown in FIG. 1 (a), the force sensing capacitor Cf is a capacitor formed by the
The
For example, the first supply voltage Vdd1 provided to the
Although not shown, the
Fig. 4 is a diagram showing an embodiment of the
An
In one embodiment, the
In one embodiment, the
Hereinafter, a method of compensating a force sensing capacitor and an operation of a force input detecting apparatus using the force sensing capacitor will be described with reference to FIGS. 5 (a), 5 (b) 5A shows a state in which the
1 (b), the
When the amount of capacitance increase of the force sensing capacitor Cf by the force input is denoted by? Cf, the equivalent capacitance electrically connected to the
The capacitance Cf of the force sensing capacitor is larger than the increased capacitance? Cf, so it is difficult to detect the capacitance variation? Cf within a range effective for the force sensing device according to the related art. According to the present embodiment, the capacitance of the force sensing capacitor can be compensated by the following process.
6 is a flowchart schematically showing each step of the force detection capacitance compensation method according to the present embodiment. Referring to FIG. 6, the method for compensating for the positive detection capacitance according to the present embodiment includes a step S100 of precharging a force sensing capacitor and a compensation capacitor to a supply voltage, (S200) of performing a first charge sharing by connecting a positive sense capacitor and a compensation capacitor in series between the positive charge sharing capacitor and the compensation capacitor, charge sharing (S300), and outputting a voltage formed by the second charge sharing (S400).
7 is an exemplary timing diagram showing control signals that the
Referring to the area indicated by the dotted line in FIG. 7, the
In the embodiment shown in FIG. 7, switches included in the
8 and 9 are diagrams showing equivalent circuits for each phase at which the
8 (b) is a diagram showing an equivalent circuit when the
Since the capacitance increase ΔCf of the force sensing capacitor is negligible compared with the capacitance of the force sensing capacitor and the capacitance of the compensating capacitor Cf + Cc, the equation (1) can be approximated as in (2). For example, if the second supply voltage Vdd2 provided to the amplifier is 2V, the first supply voltage Vdd1 is 9V, the capacitance of the force sensing capacitor Cf is 100pF and Vn is 1V, which is half of the second supply voltage The capacitance Cc of the compensating capacitor should be 800 pF. However, the capacitance of 800 pF is not economical because the die size consumption is large when the chip is formed inside the chip.
9A is a diagram showing an equivalent circuit when the
In Equation (3), the capacitance increase amount? Cf of the force sensing capacitor is negligibly smaller than the capacitance of the force sensing capacitor and the capacitance sum of the compensation capacitor Cf + Cc, so that Equation? Can be approximated as Equation have. If the force sensing capacitor Cf is 100 pF and Vn is 1 V, which is half of the second supply voltage Vdd2, which is the same condition as in the first charge sharing phase in Equation (2) of
In one embodiment, the
The force input detecting apparatus according to the present embodiment may be fixedly installed in any one place, and may be installed in a mobile phone, a tablet, a notebook computer, or the like, and the position may be changed. In addition to the case where the position is fixed, the capacitance value may increase or decrease due to changes in ambient temperature, humidity or the like even when the position is fixedly disposed at any one place. The change in the capacitance value can reduce the detection performance for the force input. However, according to the present embodiment, there is provided an advantage that the detection performance of the force input can be improved by actively coping with the capacitance which varies depending on the environment and the position of the force input detecting device.
Further, the force input detecting device according to the present embodiment can compensate the force sensing capacitor Cf through the precharge phase and the two charge sharing phases. This provides the advantage of being able to detect the force input with higher sensitivity and precision.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be appreciated that other embodiments are possible. Accordingly, the true scope of the present invention should be determined by the appended claims.
110: cover window 120: touch detection layer
130:
140b: insulated body 150: force sensing layer
200: switching part 300: detection circuit part
400:
S100 to S400: Each step of the force sensing capacitance compensation method according to the present embodiment
Claims (17)
(b) performing a first charge sharing by serially connecting the force sensing capacitor and the compensation capacitor between the supply voltage and the reference voltage,
(c) performing a second charge sharing such that the force sensing capacitor and the compensation capacitor have the same voltage, and
(d) outputting the voltage formed by the second charge sharing,
The force sensing capacitor
A force sensing capacitance compensation method using a force sensing layer as a conductive pattern having a porous structure as one electrode.
The porous structure may comprise:
Wherein the area of the central region hole is larger than the area of the peripheral area hole.
Wherein the compensation capacitor is formed by connecting a plurality of capacitors in parallel.
Wherein the force sensing capacitor and the compensation capacitor are connected in parallel to each other so that the voltages of the nodes to which the force sensing capacitor and the compensation capacitor are connected have the same voltage.
Wherein the capacitance value of the compensation capacitor is a value set such that the voltage is at a desired level.
Wherein the step of outputting the voltage comprises:
Performing the voltage by providing the detection circuit section,
Wherein the detection circuit unit receives the voltage, amplifies the voltage to a predetermined gain, and converts the amplified signal into a digital signal.
A force sensing layer which is one electrode of the force sensing capacitor whose capacitance value changes according to the deformation of the cover window; And
And a force input detecting section for detecting the force input,
The force input detecting unit includes:
A compensation unit for compensating the force sensing capacitor, a switching unit for switching an electrical connection form between the force sensing capacitor and the compensation capacitor, and a control unit for detecting an electrical signal that changes in accordance with a change in the capacitance value of the force sensing capacitor And a detection circuit section
The force sensing layer
A force input detecting device as a conductive pattern having a porous structure.
The force input detecting device includes:
Further comprising a metal body,
And the other electrode of the force sensing capacitor is the metal body.
The force input detecting device includes:
Further comprising a display unit for displaying an image,
And the other electrode of the force sensing capacitor is one of electrodes included in the display unit.
The porous structure may comprise:
Wherein the diameter of the central site hole is larger than the diameter of the peripheral area lifespan.
The form of electrical connection between the force sensing capacitor and the compensation capacitor
Wherein the force sensing capacitor and the compensation capacitor are coupled to be precharged to a supply voltage.
The form of electrical connection between the force sensing capacitor and the compensation capacitor
And a mode in which the force sensing capacitor and the compensation capacitor are connected in series and charge-shared between a supply voltage and a reference voltage.
The form of electrical connection between the force sensing capacitor and the compensation capacitor
The force sensing capacitor, and the compensation capacitor are connected in parallel so as to be charge-shared.
Wherein the switching unit is switched to provide the charge sharing formed voltage to the detection circuit unit.
The detection circuit section,
An amplifier for amplifying and outputting the electrical signal; and an analog-to-digital converter for converting the amplified signal to digital.
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KR1020150183662A KR101664329B1 (en) | 2015-12-22 | 2015-12-22 | Compensation Method of Force Sensing Capacitance and Force Input Sensing Apparatus using thereof |
US15/159,308 US10345947B2 (en) | 2015-05-27 | 2016-05-19 | Apparatus and method for detecting hovering object, switching matrix, apparatus for determining compensation capacitance, method of compensating for force sensing capacitance, and apparatus for detecting force input |
CN201610357319.9A CN106201133B (en) | 2015-05-27 | 2016-05-26 | For detecting the device and method of hovering object and the equipment of detection power input |
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KR1020150183662A KR101664329B1 (en) | 2015-12-22 | 2015-12-22 | Compensation Method of Force Sensing Capacitance and Force Input Sensing Apparatus using thereof |
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Cited By (1)
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KR20190123312A (en) * | 2017-03-03 | 2019-10-31 | 아트멜 코포레이션 | Touch sensors with force sensor response normalization, and related methods and apparatus |
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KR20120048658A (en) * | 2009-08-27 | 2012-05-15 | 쿄세라 코포레이션 | Tactile sensation imparting device and control method of tactile sensation imparting device |
KR20150109890A (en) * | 2014-03-21 | 2015-10-02 | 크루셜텍 (주) | Touch detecting three dimensional display apparatus comprising parasitic capacitance compensation circuit |
KR101564069B1 (en) * | 2015-05-27 | 2015-10-29 | (주)멜파스 | Hovering Object Detection Method, Hovering Object Detection Apparatus using the Same, Switching Matrix and Compensation Capacitance Detection Apparatus |
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KR20010037536A (en) * | 1999-10-18 | 2001-05-15 | 김순택 | Touch panel |
KR20120048658A (en) * | 2009-08-27 | 2012-05-15 | 쿄세라 코포레이션 | Tactile sensation imparting device and control method of tactile sensation imparting device |
KR20150109890A (en) * | 2014-03-21 | 2015-10-02 | 크루셜텍 (주) | Touch detecting three dimensional display apparatus comprising parasitic capacitance compensation circuit |
KR101564069B1 (en) * | 2015-05-27 | 2015-10-29 | (주)멜파스 | Hovering Object Detection Method, Hovering Object Detection Apparatus using the Same, Switching Matrix and Compensation Capacitance Detection Apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20190123312A (en) * | 2017-03-03 | 2019-10-31 | 아트멜 코포레이션 | Touch sensors with force sensor response normalization, and related methods and apparatus |
KR102260593B1 (en) * | 2017-03-03 | 2021-06-04 | 아트멜 코포레이션 | Touch sensor with force sensor response normalization, and related methods and apparatus |
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