WO2015022940A1 - 指示体検出装置及び指示体検出方法 - Google Patents
指示体検出装置及び指示体検出方法 Download PDFInfo
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- WO2015022940A1 WO2015022940A1 PCT/JP2014/071203 JP2014071203W WO2015022940A1 WO 2015022940 A1 WO2015022940 A1 WO 2015022940A1 JP 2014071203 W JP2014071203 W JP 2014071203W WO 2015022940 A1 WO2015022940 A1 WO 2015022940A1
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- conductor
- indicator
- detection sensor
- mode
- signal
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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
- G06F3/0447—Position sensing using the local deformation of sensor cells
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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
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
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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
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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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
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
Definitions
- the present invention relates to a pointer detection apparatus and a pointer detection method using a capacitance type pointer detection sensor.
- an electrostatic capacitance type indicator detection apparatus has been actively developed as a method for detecting the position of an indicator used in a touch panel or the like.
- a cross-point capacitance method that is capable of multi-touch capable of simultaneously detecting a plurality of indicators such as a plurality of fingers.
- the indicator detection sensor of the cross-point capacitance type indicator detection device is arranged in directions orthogonal to each other when viewed in a direction orthogonal to the instruction input surface of the indicator.
- a predetermined capacitance Co fixed capacitance
- the indicator fg is connected to the ground through the human body and passes through the electrostatic capacitance Cg between the human body and the ground.
- a capacitance Cf is formed between the conductor Ey, the lower conductor Ex, and the indicator fg. In this way, at the position where the indicator fg is in contact with the instruction input surface, the capacitances Cf and Cg are formed, so that the charge between the upper conductor Ey and the lower conductor Ex changes, and this charge By detecting this change, it is possible to specify the position indicated by the indicator within the instruction input surface.
- the change in capacitance in the cross-point region when the finger is brought close is very small, whereas the value of the capacitance Co between the upper conductor Ex and the lower conductor Ey is, for example, 0.5 pF. Thus, it is only about 0.05 pF. For this reason, the margin of the detection output of the indicator against noise is severe, and it is difficult to detect an indicator such as a finger with high sensitivity. Further, there is a problem that the indicator can be detected only with a conductor including a human body and cannot be detected as an indicator when a person wears rubber gloves.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2010-77991 discloses a capacitive input device that improves this problem and can detect an indicator other than a finger or an electrostatic pen. ing.
- the indicator detection sensor of the input device disclosed in Patent Document 1 includes a first substrate 2 and a flexible substrate that faces the first substrate 2 with an air layer 4 interposed therebetween.
- Second substrate 3 first conductor 5 formed on substantially the entire surface of first substrate 2 on the second substrate 3 side, and second substrate 3 on the first substrate 2 side.
- a plurality of second conductors 6 formed on the surface.
- substrate 3 is not pressed by the indicator, as shown to FIG. 25 (A)
- the second substrate 3 has flexibility, so that the second substrate 3 is first in the pressing position as shown by an arrow in FIG.
- the distance between the first substrate 2 and the second substrate 3 is shortened, and the capacitance constituted by the first conductor 5 and the second conductor 6 in the portion is C2 is larger than C1.
- the second conductor 6 comes into contact with the first conductor 5 and becomes conductive, and the pressing input at the pressing position is performed. Can be confirmed.
- Patent Document 1 there is no restriction on the indicator, and even if a person wears rubber gloves or the like, the pressing instruction position can be detected. However, even if the detection method of patent document 1 is a capacitive type, finally, the second conductor 6 is in contact with the first conductor 5 to detect the state of conduction, thereby pressing input. Is to be confirmed. Therefore, even if the position pressed by the indicator can be detected, it is difficult to accurately detect the pressing force of the indicator against the second substrate 3.
- Patent Document 2 Japanese Patent Laid-Open No. 2013-20370 provides a pointer detection sensor and a pointer detection apparatus that solve this problem.
- the pointer detection sensor disclosed in Patent Document 2 as shown in FIGS. 26 (A) and (B), a plurality of upper conductors 7x and a plurality of lower conductors 7y arranged in directions orthogonal to each other, By arranging the spacers Sp in regions that are not overlapping portions, the respective cross-point regions are separated so that the pressure applied by the indicator in each cross-point region can be accurately detected. .
- the electrode 7x and the electrode 7y are formed on opposite surfaces of the upper transparent glass substrate 8U and the lower transparent glass substrate 8L.
- the upper transparent glass substrate 8U is thin enough to bend downward.
- the spacer Sp is disposed, for example, at a position facing the region where the lower conductor 7y is not formed and the upper conductor 7x is not formed in the lower transparent glass substrate 8L. That is, the spacer Sp is formed in a region where both the lower conductor 7x and the upper conductor 7y are not formed when viewed from the upper transparent glass substrate 8U side.
- FIG. 27 it demonstrates as a case where it presses with an indicator from the upper side transparent glass substrate 8U side.
- the electrostatic capacitance (initial electrostatic capacitance) generated between the upper and lower electrodes 7x and 7y is It is small, for example, about 1 to 2 pF.
- FIG. 27 (B) when a moderate pressure is applied to the upper transparent glass substrate 8U by pressing the indicator, the distance between the upper and lower electrodes 7x and 7y becomes narrower. The capacitance between the upper and lower conductors 7x and 7y changes, for example, to about 5 to 6 pF.
- FIG. 27A when the indicator is not in contact with the upper transparent glass substrate 8U, the electrostatic capacitance (initial electrostatic capacitance) generated between the upper and lower electrodes 7x and 7y is It is small, for example, about 1 to 2 pF.
- FIG. 27 (B) when a moderate pressure is applied to the upper transparent glass substrate 8U by pressing the indicator, the distance between the upper and lower electrodes 7x and 7y becomes narrower. The capacitance between the upper and lower conductors 7x and 7y changes,
- the human finger, the casing, and the core are electrostatically conductive.
- the conventional pointer detection apparatus includes, for example, an indicator detection sensor for detecting the indication position of the indicator made of a conductor by the method described with reference to FIG.
- the indicator detection sensor for detecting the indication position of the indicator composed of a non-conductive pressing member and the indicator detection sensor for detecting the different types of indicators are provided so as to overlap each other. Was configured.
- An object of the present invention is to provide a pointer detection apparatus that can solve the above problems.
- a plurality of first conductors arranged in a first direction and a plurality of second conductors arranged in a second direction intersecting the first direction are separated from each other by a predetermined distance. Based on the fact that one of the first conductor and the second conductor is bent by the pressing by the indicator, and the distance between the first conductor and the second conductor changes.
- An indicator detection sensor based on a capacitance method in which a capacitance formed between the first conductor and the second conductor changes;
- An AC signal supply circuit for supplying a predetermined AC signal to one of the plurality of first conductors and the plurality of second conductors;
- a signal receiving circuit for detecting a reception signal corresponding to the predetermined AC signal from the other plurality of conductors of the plurality of first conductors and the plurality of second conductors;
- a control circuit and The indicator detection sensor is A spacer disposed between the first conductor and the second conductor in a cross-point region where the first conductor and the second conductor intersect and overlap each other; and
- the signal receiving circuit is: A position where the first indicator having conductivity approaches the indicator detection sensor and a position where the first indicator presses the indicator detection sensor are the first conductor and the second conductor.
- a first mode for detecting based on a change in capacitance formed between A position at which the second indicator not having conductivity presses the indicator detection sensor is detected based on a change in capacitance formed between the first conductor and the second conductor.
- the AC signal supply circuit and the signal reception circuit are provided for one pointer detection sensor, and the signal reception circuit has the first conductivity. Between the first conductor and the second conductor, a position where the pointer approaches the pointer detection sensor and a position where the first pointer presses the pointer detection sensor. A first mode that is detected based on a change in capacitance, and a position at which the second indicator that is not conductive presses the indicator detection sensor; and the first conductor and the second conductor And a second mode in which detection is performed based on a change in capacitance formed between the two.
- an indicator detection device that can detect the indication position of different types of indicators, has a simple configuration, and can be manufactured at low cost.
- a pointer detection apparatus that can detect a pointing position by a different type of pointer even with a single pointer detection sensor, has a simple configuration, and can be manufactured at low cost. Can do.
- the capacitance between the first conductor and the second conductor when a pressing force is applied by the indicator is a figure for demonstrating a change.
- the capacitance between the first conductor and the second conductor when a pressing force is applied by the indicator is a figure used in order to explain a change.
- the capacitance between the first conductor and the second conductor when a pressing force is applied by the indicator is a figure for demonstrating a change.
- the pointer detection apparatus according to the present invention can also be configured using the pointer detection sensor described in Patent Document 2 described above.
- the pointer detection apparatus according to the embodiment of the present invention will be described as a case where a new pointer detection sensor obtained by improving the pointer detection sensor described in Patent Document 2 described above is used.
- the spacer Sp is not a cross-point region, and the upper conductor 7x and the lower conductor 7y are not formed at the four corners surrounding each cross-point region. Due to the formation in the region, there are the following problems.
- the upper transparent glass substrate 8U when the upper transparent glass substrate 8U is pressed by the indicator with a pressing force Pa, in the cross point region, as shown by the thick dotted line in FIG. 28, the lower conductor 7y side further than the height of the spacer Sp. It is assumed that the upper conductor 7x is bent so as to approach. However, even if the upper transparent glass substrate 8U is pressed at the upper position of the spacer Sp with the same pressing force Pa, due to the presence of the spacer Sp, the upper conductor 7x is as shown by a thick dashed line in FIG. It is bent only up to the height of the spacer Sp.
- the height of the spacer Sp is the distance at which the upper conductor 7x is closest to the lower conductor 7y, and the region where the spacer Sp is present.
- the cross-point region where the spacer Sp does not exist even if pressing is performed with the same pressing force, a difference occurs in the distance between the upper conductor 7x and the lower conductor 7y. There are also differences in capacity.
- the upper transparent glass substrate 8U does not exceed the height of the spacer Sp even when the upper conductor 7x is pressed by the indicator with a pressing force equal to or higher than the pressing force that contacts the tip of the spacer Sp. Therefore, such a pressing force cannot be detected. For this reason, the characteristics are completely different between the pressing force versus capacitance in the cross-point region and the pressing force versus capacitance in the region where the spacer Sp is present.
- the X-direction coordinate and the Y-direction coordinate of the indication position by the indicator are each a signal level corresponding to the capacitance obtained in three mutually adjacent conductors.
- Patent Document 2 due to the deterioration of the positional accuracy, when a tracing operation is performed with an indicator, for example, in a spiral shape, as shown in FIG. 29, a display locus corresponding to the tracing operation on the display screen is shown. Has a problem that it does not become a smooth curve but becomes rattling.
- the spacer Sp needs to be arranged in a region where neither the conductor 7x nor 7y other than the cross point region exists, and therefore the arrangement interval of the spacer Sp is at least the conductors 7x, 7y. It becomes larger than each width. Furthermore, in order to obtain a predetermined amount of deflection for the conductor 7x so that a predetermined pressing force can be detected by the capacitance between the conductors 7x and 7y in the cross-point region, the spacer Sp The height needed to be increased.
- the indicator detection sensor described below improves the above problems.
- a pointer detection apparatus is used in a display function-equipped device called a tablet device with a display function, a tablet-type information terminal, or a pad-type information terminal.
- a display function-equipped device called a tablet device with a display function, a tablet-type information terminal, or a pad-type information terminal. The case where it is applied will be described as an example.
- FIG. 1 is an exploded perspective view for explaining an outline of the configuration of the pointer detection apparatus 1 of this embodiment.
- the pointer detection apparatus 1 of this embodiment has a configuration of a device with a display function.
- a motherboard 1D is housed in the lowermost layer in a housing 1E, and a display screen is on the upper side (front panel 1A side) on the LCD (Liquid Crystal Display) 1C is provided.
- the indicator detection sensor 1B according to the embodiment of the present invention is provided on the display screen side of the LCD 1C.
- the front panel 1A is provided above the indicator detection sensor 1B, and the above-mentioned storage items 1D, 1C, and 1B are held in the housing 1E.
- the motherboard 1D receives a communication circuit, a control circuit for the LCD 1C, a signal supply circuit that supplies a signal to the indicator detection sensor 1B, and a signal from the indicator detection sensor 1B, and detects an indication position and the like.
- Various circuits such as a signal receiving circuit are formed.
- LCD1C is a display means for implement
- the indicator detection sensor 1B is configured by applying the present invention, and realizes a function as a reception unit that receives various instruction inputs (operation inputs) from the user.
- the display screen of the LCD 1C is viewed through the indicator detection sensor 1B.
- the indicator detection sensor 1B is configured to have optical transparency (transparency). Thereby, the user can input various instructions through the indicator detection sensor 1B while viewing the information displayed on the LCD 1C from the front panel 1A side of the indicator detection apparatus 1.
- the LCD 1C and the indicator detection sensor 1B are connected to corresponding circuit portions of the motherboard, respectively.
- the pointer detection device is configured by the pointer detection sensor 1B and the signal supply circuit and the signal reception circuit provided in the motherboard 1D.
- the indicator detection device 1 is realized in various sizes such as A5 plate size, B5 plate size, and A4 plate size in terms of paper size, for example.
- FIG. 2 is a block diagram for explaining a configuration example of the pointer detection apparatus of this embodiment.
- the pointer detection apparatus of this embodiment includes the pointer detection sensor 1 ⁇ / b> B shown in FIG. 1, a signal supply circuit 200, a signal reception circuit 300, and a control circuit 40.
- the control circuit 40 is a circuit for controlling each part of the pointer detection apparatus of this embodiment, and is configured by mounting a microcomputer, for example.
- the indicator detection sensor 1B includes a plurality of first conductors 11X1 to 11Xm connected to the signal supply circuit 200 and a plurality of second conductors 21Y1 to 21Yn connected to the signal reception circuit 300.
- the first conductors 11X1 to 11Xm constitute a transmission conductor group 11.
- the second conductors 21Y1 to 21Yn constitute a reception conductor group 21.
- first conductors 11X1 to 11Xm and the second conductors 21Y1 to 21Yn one of the first conductors 11X1 to 11Xm is the first unless otherwise described separately.
- One of the second conductors 21Y1 to 21Yn is referred to as a second conductor 21Y.
- the number of the first conductors 11X constituting the transmission conductor group 11 and the number of the second conductors 21Y constituting the reception conductor group 21 are the size of the indication input surface 1BS of the indicator detection sensor 1B operated by the user.
- the transmission conductor group 11 side is an instruction input surface 1BS on which an instruction input is performed by an indicator such as a user's finger.
- the transmission conductor group 11 is composed of m elongated (flat plate) first conductors 11X extending in the Y-axis direction (example of the first direction) of the indicator detection sensor 1B. Are arranged at predetermined intervals in the X-axis direction.
- the reception conductor group 21 includes n second conductors 21Y that are elongated (flat plate-like) extended in the X-axis direction (example of the second direction) of the indicator detection sensor 1B, and are predetermined in the Y-axis direction. It is configured to be arranged at intervals.
- the transmission conductor group 11 and the reception conductor group 21 are arranged to face each other with a predetermined distance therebetween.
- a capacitor is configured in a portion where the first conductor 11X and the second conductor 21Y face each other.
- the first conductor 11X and the second conductor 21Y are opposed to each other in a region of a cross point that overlaps each other when viewed from a direction orthogonal to the instruction input surface 1BS, as described later. Is disposed.
- the first conductor 11X and the second conductor 21Y are formed of, for example, a transparent electrode film made of a silver pattern, an ITO (Indium Tin Oxide) film, or a copper foil. .
- the signal supply circuit 200 transmits a signal for enabling detection of an indication position by the indicator with respect to the indication input surface 1BS of the indicator detection sensor 1B and a pressing force applied to the indication position. Is supplied to each of the first conductors 11X constituting the.
- the signal supply circuit 200 includes a selection circuit 24 and a signal generation circuit 25 as shown in FIG.
- the selection circuit 24 selectively supplies a signal from the signal generation circuit 25 to the first conductor 11X in accordance with the control from the control circuit 40.
- the signal generation circuit 25 generates an AC signal such as a sine wave or a rectangular wave having a predetermined frequency in accordance with the control of the control circuit 40, and supplies this to the selection circuit 24.
- the selection circuit 24 of this embodiment is switched and controlled by the control circuit 40 so as to supply signals from the signal generation circuit 25 to all the first conductors 11X1 to 11Xm within a predetermined time. As described above, the selection circuit 24 selectively supplies the AC signal from the signal generation circuit 25 to the first conductor 11X in order to provide a plurality of indication positions on the indication input surface 1BS and the pressing force applied thereto. This is so that it can be detected.
- the signal reception circuit 300 performs signal processing on the reception signals obtained from the plurality of second conductors 21Y constituting the reception conductor group 21, thereby indicating the position of the indication position on the indication input surface 1BS by the indicator. Detection and detection of the pressing force applied to the indicated position are performed.
- the signal reception circuit 300 includes an amplification circuit 31, an A / D (Analog / Digital) conversion circuit 32, and an indication position and pressing force detection circuit 33.
- the amplification circuit 31 amplifies the reception signal obtained from the second conductor 21Y constituting the reception conductor group 21 and supplies the amplified signal to the A / D conversion circuit 32.
- the A / D conversion circuit 32 converts the reception signal from the second conductor 21 ⁇ / b> Y amplified by the amplification circuit 31 into a digital signal, and supplies these to the indication position and pressing force detection circuit 33.
- the instruction position and pressing force detection circuit 33 is instructed to input an instruction input surface 1BS that is instructed when an instruction input by the indicator is made to the indicator detection sensor 1B.
- the upper indicated position is detected (identified) and the applied force (pressing force) is detected.
- a capacitor is formed at a portion where the first conductor 11X and the second conductor 21Y face each other.
- the instruction input surface 1BS is bent in accordance with the pressing force, and 1 or The distance between the plurality of first conductors 11X and one or the plurality of second conductors 21Y changes.
- the capacitance of the capacitor constituted by the first conductor 11X and one or a plurality of second conductors 21Y changes according to the pressing force. For this reason, the signal (current) transmitted from the first conductor 11X to the second conductor 21Y increases in the portion where the capacitance has changed.
- the indicator detection sensor 1B by detecting the signal amount (current amount) flowing through each of the plurality of second conductors 21Y, it is possible to detect which position on the indicator detection sensor 1B the indicator is operating. Can do. Note that it can be recognized from the information from the control circuit 40 to which first conductor 11X the AC signal is supplied. Based on these pieces of information, a portion where the first conductor 11X to which the AC signal from the signal generating circuit 25 is supplied and the second conductor 21Y whose signal amount has changed according to the position indicated by the indicator intersects, It can be detected that the position region is instructed by the indicator. In addition, since the capacitance of the capacitor changes according to the pressure applied by the indicator, the amount of signal applied to the indicator detection sensor 1B is detected by the indicator by detecting the amount of signal flowing through the second conductor 21Y. It can also be detected.
- the indication position and pressing force detection circuit 33 can detect a signal corresponding to the pressing force by the indicator in addition to the position indicated by the indicator.
- the indicated position and the pressing force detected by the indicated position and pressing force detection circuit 33 are supplied to a predetermined control circuit in the motherboard 1D and used as input information from the user.
- the indicator is a human finger, or a pen-type indicator (so-called electrostatic pen) having a conductive core and housing.
- a pen-type indicator so-called electrostatic pen
- the first conductor 11X and the second conductor 21Y have a first mode for detecting pressure, and the user's finger wearing rubber gloves or a pressing force by a pen-type indicator having no conductivity.
- the control circuit 40 sets the indication position and pressing force detection circuit 33 to the indicator detection processing operation in the first mode and the second mode.
- the configuration is such that a plurality of indicators can be detected simultaneously.
- the control circuit 40 also supplies a gain control signal to the amplifier circuit 31, and performs control to switch the gain of the amplifier circuit 31 between the first mode and the second mode.
- FIG. 3 is a diagram for explaining a configuration example in which the indicator detection sensor 1B of the embodiment is viewed from the direction of the instruction input surface 1BS from the direction orthogonal to the instruction input surface 1BS. Some are shown.
- FIG. 4 is a cross-sectional view of the indicator detection sensor 1B of the embodiment, and here, is a cross-sectional view taken along line AA in FIG. In the indicator detection sensor 1B shown in FIG.
- the direction in which the first conductors 11X are arranged is the X-axis direction
- the direction in which the second conductors 21Y are arranged is the Y-axis direction.
- the instruction input surface 1BS side is referred to as the upper side.
- the indicator detection sensor 1 ⁇ / b> B includes an upper substrate (first substrate) 10 and a lower substrate (second substrate) 20 that are arranged vertically.
- the upper surface 10a of the upper substrate 10 opposite to the surface facing the lower substrate 20 is the instruction input surface 1BS.
- the upper substrate 10 is made of a flexible material that can be bent toward the lower substrate 20 when pressed by the indicator on the instruction input surface 1BS (the upper surface 10a of the upper substrate 10). It is composed of a relatively thin glass substrate, or a film substrate made of a transparent synthetic resin such as PET (polyethylene terephthalate), PP (polypropylene), or LCP (liquid crystal polymer). Since the lower substrate 20 is not pressed by the indicator, it does not need to bend. In this example, the lower substrate 20 is made of a glass substrate thicker than the upper substrate 10 or a rigid transparent synthetic resin.
- m (m is an integer equal to or greater than 2) elongated (flat plate) pieces each having a predetermined width Wx and extending in the Y-axis direction on the side facing the lower substrate 20 of the upper substrate 10.
- 11Xi-1, 11Xi, 11Xi + 1,..., 11Xm are arranged in the X-axis direction at a predetermined arrangement pitch Px (> Wx).
- Each of the m first conductors 11X is configured by a transparent electrode made of ITO (Indium Tin Oxide) in this example.
- Each of the m first conductors 11X is connected to a selection circuit 24 constituting the signal supply circuit 200 shown in FIG. 2 provided on the motherboard 1D through each of the first connection conductors (not shown).
- each has a predetermined width Wy, and n (n is an integer of 2 or more) elongated (flat plate) extending in the X-axis direction.
- 21Yj-1, 21Yj,..., 21Yn are arranged in the Y-axis direction at a predetermined arrangement pitch Py (> Wy).
- Each of the n second conductors 21Y is configured by a transparent electrode made of ITO (Indium Tin Oxide) in this example.
- Each of the n second conductors 21Y is connected to an amplifier circuit 31 included in the motherboard 1D and included in the signal receiving circuit 300 shown in FIG. 2 through a second connection conductor (not shown).
- the first conductor 11 ⁇ / b> X and the upper substrate 10 are formed by a known conductor formation process such as vapor deposition or printing. It is formed integrally.
- the second conductor 21Y is integrally formed with the lower substrate 20 by a known conductor forming process such as vapor deposition or printing. .
- the upper substrate 10 is provided with a dielectric member so as to cover the whole of the m first conductors 11X1 to 11Xm.
- This dielectric member is composed of a transparent dielectric film made of a dielectric having a relative dielectric constant of about 2 to 10, such as PET (polyethylene terephthalate), PP (polypropylene), LCP (liquid crystallization).
- the thickness of the dielectric member layer is, for example, 5 to 15 ⁇ m.
- a glass material can also be applied as the dielectric member.
- the dielectric member may be constituted by a dielectric film (relative dielectric constant of 40 or more) filled with a high dielectric constant filler at a high density.
- various dielectric materials having transparency such as transparent epoxy resin, acrylic resin for photoresist, highly light-transmitting fluororesin, and one-component urethane resin can be applied. This dielectric member may not be provided.
- the frame-shaped bonding member is arranged such that the peripheral portion of the upper substrate 10 and the peripheral portion of the lower substrate 20 are separated by a predetermined distance d from the peripheral portion of the upper substrate 10 and the peripheral portion of the lower substrate 20. 30 and are sealed together. Therefore, in the indicator detection sensor 1B of this embodiment, the air layer 14 is sealed and interposed in the gap between the lower substrate 20 and the upper substrate 10 in this example.
- a space between the lower substrate 20 and the upper substrate 10 may be filled with a transparent liquid instead of air. In the case of a liquid layer instead of an air layer, the upper substrate The transparency between 10 and the lower substrate 20 is increased.
- the cross point is a region where the first conductor 11X and the second conductor 21Y overlap each other.
- the spacer has a deflection amount of the upper substrate 10 due to the pressing by the indicator only in the cross point region, in a region other than the cross point region, than the value in the cross point region. It is arranged at a position, shape and height such that the value becomes larger. In order to satisfy this condition, in this embodiment, the spacer is arranged in the central region excluding the predetermined portion from the periphery in the region of the cross point.
- These four spacers Sa to Sd are formed by a principle such as printing a transparent dielectric material or ejecting ink in a dot printer. In this case, the material of the four spacers may be hard or elastic.
- FIG. 3 the spacers Sa to Sd on the second conductor 21Y are shown by solid lines as being visible through the transparent first conductor 11X. Because of its small size, it is hardly noticeable. The same applies to other figures represented in the same manner as FIG.
- the four spacers Sa, Sb, Sc, Sd are separated from each other in the X and Y directions by Gx or Gy.
- the distance in the X direction between the spacers in the adjacent first conductor 11X that is, the distance between the spacer Sd or Sc of the first conductor 11Xi-1 and the spacer Sa or Sb of the adjacent first conductor 11Xi.
- the distance in the Y direction between the spacers in the adjacent second conductor 21Y that is, the spacer Sb or Sc of the second conductor 21Yj-1 and the spacer Sa or Sd of the adjacent second conductor 21Yj.
- the spacer Sp is arranged in a region where the first conductor 11X and the second conductor 21Y are not present outside the cross point region, the X direction and the Y direction are arranged.
- the distance between the spacers had to be larger than the arrangement pitches Px and Py of the first conductor 11X and the second conductor 21Y.
- the height of the spacer Sp is equal to or less than the distance between the first conductor 11X and the second conductor 21Y. For example, it was set to 10 to 60 ⁇ m and was selected relatively large.
- the heights H of the spacers Sa, Sb, Sc, and Sd are 4 to 10 ⁇ m, compared with the case of Patent Document 2, in combination with being provided in the region of the cross point. Can be lowered.
- the height H of the spacers Sa to Sd is 6 ⁇ m.
- the height H of the spacers Sa to Sd is sufficient to calculate the coordinates of the indicated position by the indicator until the first conductor 11X formed on the upper substrate 10 contacts the spacers Sa to Sd. It is assumed that the capacitance change has occurred. Therefore, even if the first conductor 11X formed on the upper substrate 10 comes into contact with the spacers Sa to Sd and does not bend any more, a signal level sufficient for coordinate calculation is obtained at that time. Therefore, the detection position coordinates of the indicator can be detected with high accuracy.
- the distance d between the first conductor 11X and the second conductor 21Y is also made smaller than in the case of Patent Document 2.
- the spaces Sa to Sd are disposed only in the central region of the cross point region, and no spacers are provided in regions other than the cross point region.
- the heights of the spacers Sa to Sd can be made lower than in the case of Patent Document 2, and the upper substrate 10 and the first conductor 11X can be flexibly deformed with a small pressing force.
- the deformation due to the pressing force of the upper substrate 10 and the first conductor 11X is limited until the upper substrate 10 and the first conductor 11X come into contact with the spacers Sa to Sd. It is set as the structure which does not have. Thereby, for example, the pressing force can be detected from several tens of grams, and the detection coordinate accuracy of the indicated position to which the pressing force is applied is improved.
- the amount of deflection of the upper substrate 10 due to pressing is such that the value outside the cross point region is larger than the value at the cross point region. Yes. Further, as described above, the separation interval between the adjacent members of the spacers Sa to Sd satisfies Gx ⁇ tx ⁇ Px and Gy ⁇ ty ⁇ Py, so that the upper side in the region other than the cross point region is increased. The amount of bending of the substrate 10 can be further increased. Therefore, the detection sensitivity of the application position of the pressing force by the indicator in the region other than the cross point region is improved.
- the distance between the spacers is larger than the distance between the spacers in the X direction and the Y direction in the diagonally adjacent cross point region. Detection sensitivity is improved when a region where the second conductor 21Y is not present is pressed with an indicator.
- the pointer detection sensor of the above-described embodiment can solve the problems described at the beginning in the case of Patent Document 2.
- the effect of the pointer detection sensor of the above-described embodiment will be described in more detail.
- the capacitance principle formed between the first conductor 11X and the second conductor 21Y is large by applying the principle of the capacitor represented by the arithmetic expression shown in (Expression 1). It has a structure that causes change.
- the first conductor 11X of the upper substrate 10 and the second conductor 21Y of the lower substrate 20 are separated by a predetermined distance d.
- the upper substrate 10 and the first conductor 11X have flexibility, respectively.
- the upper substrate 10 and the first conductor 11X bend toward the lower substrate 20 in the vicinity of the portion to which the pressing force is applied, and the first conductor 11X and the lower side of the upper substrate 10 at the bent portion.
- the distance between the substrate 20 and the second conductor 21Y is smaller than the distance d in accordance with the applied pressing force.
- the capacitance of the capacitor formed by the first conductor 11X at the portion where the pressing force is applied and the second conductor 21Y of the lower substrate 20 Becomes larger.
- the coordinates of the indicated position to which the pressing force is applied by the indicator are detected by a so-called three-point method in this example. That is, in FIG. 5A, the first conductor 11X bends, so that the distance between the three second conductors 21Yj-1, 21Yj, and 21Yj + 1 facing the first conductor 11X is increased.
- the respective capacitances Cj ⁇ 1, Cj, Cj + 1 of the capacitors formed between the first conductor 11X and the second conductors 21Yj-1, 21Yj, 21Yj + 1 change.
- the signal receiving circuit 300 (see FIG. 2) of the position detection device, signal levels corresponding to the values of the three electrostatic capacitances Cj ⁇ 1, Cj, and Cj + 1 are detected, and are pressed by the indicator using the signal levels.
- the Y coordinate of the indicated position to which is applied is detected.
- the X coordinate of the indicated position to which the pressure is applied by the indicator is detected based on which of the first conductors 11X supplying the transmission signal.
- the signal receiving circuit 300 of the position detection device calculates the pressing force by the indicator from the signal level corresponding to the values of the electrostatic capacitances Cj ⁇ 1, Cj, Cj + 1.
- the spaces Sa to Sd are arranged only in the central region portion of the cross point region, so that the upper substrate 10 and the first conductor 11X are also formed in regions other than the cross point region.
- the first conductor 11X formed on the upper substrate 10 has the spacer Sd as shown by the dotted line in FIG.
- the same pressing force is applied by an indicator in an area other than the cross-point area, it bends as shown by a solid line (same as FIG. 5B).
- the amount of bending of the first conductor 11X in the region other than the cross point region is the amount of bending with the first conductor 11X in the cross point region. Since it becomes larger than the amount, the change in the electrostatic capacity with respect to the pressing force by the indicator can be made similar in the cross point region and the region other than the cross point region.
- FIG. 7 to 9 show a distribution diagram of the amount of deflection of how the pressed portion of the upper substrate 10 and the first conductor 11X is deformed. It is shown in FIG. 7 to 9, the positions of the white small arrows in the distribution diagrams indicate the positions where the pressure by the indicator is applied, and the deflection amounts of the upper substrate 10 and the first conductor 11X are as follows. The same bend amount position is connected to display the same as the contour line. Furthermore, the greater the amount of deflection, the deeper the contour is shown.
- FIGS. 7 to 9 show a state in which pressing is performed with a thin and pointed indicator such as a mechanical pencil core.
- FIG. 7A to 7E show changes in the deflection amount in each positional relationship with the spacers Sa to Sd when the application position of the pressing force by the indicator moves on the first conductor 11X.
- FIG. The change in the amount of deflection in each positional relationship with the spacers Sa to Sd when the pressing force application position by the indicator moves along one second conductor 21Y is also the pressing force application position by the indicator. This is the same in the direction of movement.
- FIGS. 9A to 9F the application position of the pressing force by the indicator is a region other than the region of the cross point, and over the region between the two adjacent second conductors 21Y.
- FIG. 6 is a diagram showing a change in the amount of deflection in each positional relationship with the spacers Sa to Sd when moved in the X direction. Spacers Sa to Sd when the pressing force applied by the indicator is moved in the Y direction over the region between the two adjacent first conductors 21X other than the cross point region. The change in the amount of bending in each positional relationship is the same in the moving direction of the position where the pressing force is applied by the indicator.
- the indicator detection sensor 1B of this embodiment even when the area other than the cross-point region is pressed by the indicator, the upper substrate 10 and the first conductor 11X.
- the deformation due to the bending is propagated to the region of the cross point where the first conductor 11X and the second conductor 21Y overlap. That is, even when a region other than the cross point region is pressed by the indicator, a change in detection level based on the capacitance occurs in the cross point region.
- the indicator detection sensor of this embodiment it is possible to detect coordinates with high accuracy at the positions indicated by pressing by the indicator at all positions on the instruction input surface 1BS. It is also possible to detect the pressing force by the indicator.
- the above has mainly referred to the bending of the upper substrate 10 and the first conductor 11X with respect to the pressing force by the indicator outside the cross-point area.
- the cross-point area like a mechanical pencil core.
- FIGS. 10A to 10D show a thin pointed indicator such as a mechanical pencil core that pushes the central area of the cross-point area with a pressing force P, and the pressing position in the horizontal direction.
- the first conductor 11X when moved from the center position of the central area of the cross-point area to the position just above the spacers Sa to Sd in the outer peripheral direction. The state of bending is shown.
- the upper substrate 10 is omitted for simplicity.
- FIGS. 10A to 10D the capacitance generated between the first conductor 11X and the second conductor 21Y in the cross-point region is shown in the central region surrounded by the spacers Sa to Sd.
- the capacitance C ⁇ of the capacitor is divided into the capacitances C ⁇ and C ⁇ of the capacitors on both sides outside the central region surrounded by the spacers Sa to Sd, and it is assumed that these three capacitors are connected in parallel.
- the capacitances C ⁇ , C ⁇ , and C ⁇ are schematically shown by squares, and the heights thereof correspond to the capacitance values.
- the capacitance generated between the first conductor 11X and the second conductor 21Y in the cross-point region can be considered as the sum of three capacitances C ⁇ , C ⁇ , and C ⁇ .
- the change in the bending amount of the first conductor 11X following the movement of the indicator changes until the pressing position reaches directly above any of the spacers Sa to Sd.
- the distance between the first conductor 11X and the second conductor 21Y increases in the central region of the cross-point region, and both sides of the central region. It decreases in the area outside the central area.
- the three electrostatic capacities C ⁇ , C ⁇ , and C ⁇ also change in accordance with the change in the distance, so that the combined electrostatic capacity hardly changes.
- the arrows shown in the lower substrate 20 indicate that the three capacitances C ⁇ , C ⁇ , and C ⁇ have increased compared to the previous stage (upward arrow). ) Or decreased (down arrow).
- the pointer detection sensor 1B of this embodiment even if the pressing position by the pointer moves from the center position of the central area of the cross point area to the position just above the spacers Sa to Sd in the outer circumferential direction, There is almost no variation in the capacitance of the entire area, and a stable detection signal level of the pointer can be obtained, and the detection coordinate accuracy of the pointer position is improved.
- the positions at which the spacers Sa to Sd are arranged and the height thereof are the changes in capacitance due to the bending of the first conductor 11X when pressed by the indicator at an arbitrary position in the above-described cross point region.
- the influence on the signal detection level in the cross-point region due to the installation of the spacers Sa to Sd is minimized.
- the upper substrate 10 and the lower substrate 20 are bonded to each other via the frame-shaped bonding member 30 at the periphery, and the upper substrate 10 and the lower substrate 20 are connected to each other. Air is sealed between them. The sealed and confined air causes a pressure change according to the pressure of the indicator, and the capacitance change can be further increased by the pressure change.
- the curve facing the lower substrate 20 in FIG. 12 (A) shows the bending change of the first conductor 11X formed on the upper substrate 10 by the pressing force P by the indicator
- FIG. 12 (B) shows a change in the capacitance C that occurs in response to a change in the bending of the first conductor 11X.
- the portion to which the pressing force P is applied has a smaller distance between the upper substrate 10 and the lower substrate 20, so that the capacitance is as shown in FIG.
- the parts on both sides of the pressing position pushed back by the force in the direction opposite to the pressing force P are larger than before the pressing force is applied as shown in FIG.
- the capacitance thereof is smaller than that before the pressing force is applied as shown in FIG.
- the upper substrate 10 and the first conductor 11X are subjected to differential bending displacement between the portion to which the pressing force P is applied and the portions on both sides thereof, and are thus pressed by the indicator by the three-point method.
- the accuracy in calculating the position coordinates is improved.
- the pointer detection device disclosed in Patent Document 2 described above cannot be detected with high accuracy even in the case of the hybrid configuration described above. That is, in the first mode, the position of the indicator can be detected regardless of the spacer. On the other hand, in the second mode, it can be detected without any spots, but it is affected by the disturbing spacer when the indicator is pressed directly above the spacer and when the cross point area without the spacer is pressed. Thus, it is clear from FIG. 29 that the detection of the pressure is uneven. Therefore, the conventional hybrid type indicator detection device has a low accuracy. On the other hand, in the present embodiment using the spacers arranged in the region of the cross point, the accuracy in the so-called second mode is improved, and the hybrid-side indicator detection device can be realized.
- the predetermined time T can be set to, for example, half the time during which a transmission signal is supplied to the transmission conductor (in this example, the first conductor 11X). That is, the first mode and the second mode are switched between the first half and the second half of the time during which the transmission signal is supplied to the transmission conductor. If the transmission signal is sequentially supplied to each transmission conductor one by one, the first mode and the second mode are switched between the first half and the second half of the time during which the transmission signal is supplied to the single transmission conductor. Thus, if the transmission signal is supplied simultaneously in units of a plurality of transmission conductors, the first mode and the second mode in the first half and the second half of the time during which the transmission signals are supplied to the plurality of transmission conductors. To switch.
- the predetermined time T supplies a transmission signal to all of the transmission conductors (in this example, the first conductor 11X) constituting the indicator detection sensor 1B, and in response to this, the reception conductor (in this example, the second conductor 11X). It is also possible to set the time until processing of the received signal from the conductor 21Y) and the calculation processing for detecting the pointing position and the pressing force by the pointer on the pointing input surface 1BS is completed. That is, in this case, the first mode and the second mode are switched every time the pointing position and the pressing force are detected by the pointer in the entire area of the pointing input surface 1BS. It should be noted that the first mode and the second mode may be switched not every time detection of the indication position and the pressing force by the indicator in the entire area of the instruction input surface 1BS is performed every time.
- first mode electrostatic mode
- the transmission signal (voltage signal) supplied to the transmission conductor, in this example, the first conductor 11X.
- the transmission signal causes a current to flow through the capacitance Co in the cross-point region of the receiving conductor, in this example, the second conductor 21Y and the transmitting conductor (first conductor 11X).
- the current flows through the second conductor 21Y and is supplied to the signal reception circuit 300 as a reception signal (current signal). This is the same in all cross-point areas of the instruction input surface 1BS.
- an electrostatic pen as an example of the indicator 15 is not in contact with the instruction input surface 1BS but is in a close position (a so-called hovering state).
- the indicator 15 and the second conductor 21Y are statically coupled.
- a capacitance Cfa or Cfb (including the capacitance of the human body holding the indicator 15 by hand) is generated.
- a part of the current flowing through the capacitance Co by the transmission signal (voltage signal) disappears through the capacitance Cfa or Cfb.
- the current flowing through the second conductor 21Y at the instruction input position by the indicator 15 is based on a value ref (this is a reference value) when the indicator 15 is not present. Also decreases.
- the indicator 15 is placed at a position separated from the instruction input surface 1BS, or is placed at a contact position. Detect that. Then, by detecting the position of the cross point where the decreasing current change occurs, the instruction input position by the indicator 15 from the position separated from the instruction input surface 1BS to the contact position is detected.
- the portion of the upper substrate 10 to which the pressing force is applied is shown in FIG.
- the distance between the first conductor 11X and the second conductor 21Y is shortened, and the capacitance between both electrodes becomes larger than the capacitance Co by an amount corresponding to the pressing force.
- the pressing force applied by the indicator 15 is increased and the change in the capacitance between the first conductor 11X and the second conductor 21Y is larger than the capacitance Cfb
- the amount of current flowing through the capacitance between the first conductor 11X and the second conductor 21Y is larger than the amount of current that has disappeared through the capacitance Cfb.
- the signal receiving circuit 300 detects the position where the indicator input surface 1BS is pressed by the indicator 15 by detecting the position where the current change that is larger than the reference value ref is generated, and the reference value The pressing force is detected from the amount of increase with respect to ref.
- the signal receiving circuit 300 detects the position where the current change that is larger than the reference value ref is generated, so that the instruction input surface 1BS is pressed by the indicator. The position is detected, and the pressing force is detected from the increase amount with respect to the reference value ref.
- the control circuit 40 of the signal receiving circuit 300 performs the processing operation in the designated position and pressing force detection circuit 33 at the predetermined time T described above, the processing operation for the first mode, and the processing operation for the second mode. In addition, switch in time division. In addition, the control circuit 40 performs control so that the gain of the amplifier circuit 31 is changed between the first mode and the second mode.
- the state in which the amount of current increases as shown in FIG. 17 indicates that the increase in the capacitance between the first conductor 11X and the second conductor 21Y is the capacitance. It arises from where it becomes larger than Cfb.
- the second mode it occurs from the time when the pressing force is applied to the instruction input surface 1BS by the indicator. That is, in the first mode, in order to obtain a state in which the amount of current increases as shown in FIG. 17, the pressing force (writing pressure) applied by the indicator is the amount of change in the capacitance corresponding to the capacitance Cfb. Offset is required. On the other hand, such an offset does not exist in the second mode.
- the control circuit 40 controls the gain of the amplifier circuit 31 to be increased by the above-mentioned offset as compared with the second mode. Accordingly, as shown in FIG. 17, in the pressing force detection process in the direction in which the received signal level is larger than the reference value ref, the characteristics of the pressing force versus the received signal level are substantially the same as those in the first mode and the second mode. Correct so that
- the indication position and pressing force detection circuit 33 distinguishes and manages the position of the indicator detected in the first mode and the position of the indicator detected in the second mode. Detection according to the subsequent position movement of the indicator and a change in pressing force can be performed according to the type of the indicator.
- the method of managing separately is a method in which the buffer memory that stores the position of the indicator detected in the first mode is different from the buffer memory that stores the position of the indicator detected in the second mode,
- a common buffer memory is a method of storing the position information of the pointer detected in the first mode and the position information of the pointer detected in the second mode by adding information for identifying each of them. Can be used.
- FIGS. 18A and 18B show an example in which one spacer is provided in the central region of the cross point region.
- the spacer is surrounded by the four spacers Sa to Sd described above.
- a spacer Se made of a flat and thin columnar body having the same height as the spacers Sa to Sd is disposed over the entire square region.
- the shape of one space is not limited to a quadrangular prism shape as in the example of FIG. 18, and may be a polygonal prismatic shape or a cylindrical shape.
- the shape of one spacer is a shape that has the same distance relationship with respect to each of the four sides of the peripheral portion of the cross point region. Instructed that the deformation of the upper substrate 10 and the first conductor 11X is the same in each of the directions from the center position of the cross-point region toward the four sides of the peripheral portion, and the bending deformation differs depending on the direction. This is to prevent deterioration of the body coordinate calculation accuracy.
- FIGS. 18C and 18D are other examples in the case where a plurality of spacers are provided in the cross-point region.
- a quadrangular shape is formed in the central region of the cross-point region.
- Spacers Sf, Sg, Sh, and Si are disposed at each of the four corners of the quadrangular region inclined 45 degrees with respect to the cross point region.
- the number of spacers is not limited to four as in the above example, but may be four or more. However, in this case as well, it is preferable that the number and position of the plurality of spacers be the same distance relationship with respect to each of the four sides of the peripheral portion of the cross point region. .
- the distances in the X direction and the Y direction of the spacers in the adjacent cross point regions are the intervals in the X direction and the Y direction of the spacers in the same cross point region (see FIG. 3). It is made to satisfy that Gx and Gy are larger than (corresponding). As a result, the amount of bending of the upper substrate 10 and the first conductor 11X is set to be larger in the region other than the cross point region than in the central region of the cross point region.
- FIGS. 18A and 18B do not need to be a flat surface, and the tip as shown in FIGS. 18C and 18D is sharp. It is not necessary to have a shape that spreads out at the bottom.
- FIGS. 18E and 18F show an example in which a single circular spacer is provided in the cross-point region. In this example, the skirt extends over the periphery of the cross-point region. An expanded dome-shaped spacer Sj is provided.
- the plurality of spacers may be disposed not only in the peripheral portion of the central region but also in both the peripheral portion of the central region and the inside of the central region.
- the spacer may be composed of a hard material, but may be composed of an elastic body.
- the first conductor 11X and the second conductor 21Y can be further approached by the pressing force of the indicator, and further improvement in sensitivity can be expected.
- the spacer is formed on the second conductor 21Y.
- the same effect can be obtained even if the spacer is formed on the first conductor 11X.
- the first mode and the second mode are executed in a time-sharing manner so that two types of pointers of different types can be detected without distinction.
- a hybrid type configuration is used.
- the indicator detection device 1 can be provided with a mode switching button, and can be used as a dedicated device for each mode by switching between the first mode and the second mode according to the indicator to be used. .
- a transparent elastic resin material is encapsulated to improve the optical characteristics.
- the configuration of the pointer detection sensor of this embodiment is the same as that of the above-described embodiment. Therefore, this embodiment will be described below using the same reference numerals for the same parts as the pointer detection sensor of the above-described embodiment.
- an ultraviolet curable optical elastic resin OCR (Optical Clear Resin / LOCA)
- OCR ultraviolet curable optical elastic resin
- the OCR is completely cured at the portion corresponding to the spacer, but the portion other than the spacer may be left as an uncured liquid or may be semi-cured to be in a gel state or a sol state. is there.
- the spacer is attached to the upper substrate. 10 and the lower substrate 20 may be formed as a bridge (second manufacturing method).
- the first substrate 11X is formed on the one side of the upper substrate 10, and the second conductor 21Y is formed on the one side of the lower substrate 20.
- the upper substrate 10 and the lower substrate 20 are formed such that the first conductor 11X and the second conductor 21Y are orthogonal to each other, and the first conductor 11X of the upper substrate 10 is formed.
- the surface on which the second conductor 21Y of the lower substrate 20 is formed is separated from the surface on which the second substrate 21Y is formed by the predetermined distance d described above (see FIG. 19A).
- the OCR 16 in a liquid state before curing is caused to flow into a gap having a distance d between the upper substrate 10 on which the first conductor 11X is formed and the lower substrate 20 on which the second conductor 21Y is formed ( (See FIG. 19B).
- a frame-shaped bonding member is provided so that the peripheral portion of the upper substrate 10 and the peripheral portion of the lower substrate 20 are separated by a predetermined distance d from the peripheral portion of the upper substrate 10 and the peripheral portion of the lower substrate 20.
- the OCR 16 is sealed in a gap having a distance d between the upper substrate 10 and the lower substrate 20.
- the mask member 50 is made of a material that does not transmit ultraviolet rays UV.
- ultraviolet rays UV are irradiated through the respective through holes 51 to 54 so that the portion of the OCR 16 irradiated with the ultraviolet UV through the respective through holes 51 to 54 is cured.
- the height of the cured portion of the OCR 16 becomes the same height as the spacers Sa to Sd described above.
- the spacers Sa ′ to Sd ′ corresponding to the spacers Sa to Sd described above are cross-point regions on the first conductor 11X.
- the indicator detection sensor 1B ′ of this embodiment is different in that a liquid layer of OCR 16 is sealed in place of an air layer in the gap between the first conductor 11X and the second conductor 21Y.
- the only difference is that the spacers Sa ′ to Sd ′ are formed on the single conductor 11X, and the same operational effects as those of the indicator detection sensor 1B of the above-described embodiment are obtained.
- the OCR 16 other than the spacers Sa ′ to Sd ′ may not be left in a liquid state but may be semi-cured to be in a gel state or a sol state.
- the spacer is separated from either the first conductor formed on the upper substrate 10 or the second conductor formed on the lower substrate 20 and away from the other conductor. It is a case where it forms so that it may become for the predetermined
- An example of the second manufacturing method is a case where a spacer is formed so as to bridge between the first conductor formed on the upper substrate 10 and the second conductor formed on the lower substrate 20. .
- portions of the OCR 16 other than the spacer to be completely cured are semi-cured to be in a gel state or a sol state. Also in this second manufacturing method, the OCR 16 in portions other than the spacer to be completely cured may be left as an uncured liquid.
- the upper substrate 10 on which the first conductor 11X is formed and the lower substrate 20 on which the second conductor 21Y is formed are combined with the first conductor 11X and the second conductor 11X.
- the above-mentioned predetermined distance d is spaced apart from each other (see FIG. 21A).
- ultraviolet rays UV are irradiated from the upper substrate 10 side until the OCR 16 is semi-cured and becomes a gel state or a sol state (see FIG. 21C).
- the OCR 16 is semi-maturely cured by appropriately selecting conditions such as the integrated light quantity, irradiation intensity, and wavelength of the ultraviolet UV.
- the OCR 16 is not bonded to the upper substrate 10 and the lower substrate 20.
- the mask member 50 in which the through holes 51 to 54 are formed at positions corresponding to the positions of all the spacers Sa to Sd shown in FIG. 20 is disposed on the upper substrate 10 (FIG. 21D). reference).
- ultraviolet rays UV are irradiated through the respective through holes 51 to 54 so that the OCR 16 portions irradiated with the ultraviolet UV through the respective through holes 51 to 54 are completely cured. . Then, after complete curing of the OCR 16 portion irradiated with the ultraviolet rays UV through the respective through holes 51 to 54, the mask member 50 is removed.
- the portions include the first conductor 11X and the second conductor 21Y.
- Columnar spacers Sap to Sdp are formed so as to bridge them.
- the part which was not irradiated with the ultraviolet rays UV for the mask member 50 remains in a gel state or a sol state.
- the columnar spacers Sap to Sdp in which the OCR is cured have elasticity and are bonded to the upper and lower first conductors 11X and second conductors 21Y at both ends of the columnar shape.
- the OCR 16 other than the spacer Snp and the OCR 16 remain in a gel state or a sol state, and the upper substrate 10 and the lower substrate 20 are not bonded.
- P is applied, a bending change as shown in FIG. 22 occurs.
- FIG. 22 is a schematic diagram for explaining the bending due to the pressing force P.
- a columnar spacer Snp is formed between the thin upper substrate 10 and the relatively thick lower substrate 20. It shows the state that was done. Since FIG. 22 is a schematic diagram, the first conductor 11X formed on the upper substrate 10 and the second conductor 21Y formed on the lower substrate 20 are omitted.
- the columnar spacers Snp are shown as being formed at equal intervals for convenience, but in practice, as shown in FIG. 21E, the columnar spacers Sap ⁇ Sdp are formed only in the cross-point region.
- the upper substrate 10 when the pressing force P is applied on the spacer Snp by the indicator, the upper substrate 10 bends so that the periphery of the pressed position is widely recessed. . And in the position (left and right ends in FIG. 22 (A)) away from the pressed position, the uncured gel or sol-like OCR flows, so that the spacer Snp at the left and right ends is in the initial state.
- the upper substrate 10 and the lower substrate 20 extend away from each other.
- the OCR 16 is bonded to all the portions in contact with the upper substrate 10 and the lower substrate 20. Therefore, even if it is pressed and depressed by the pressing force P, the force to return it is strong, and therefore the upper substrate 10 will not be depressed unless pressed strongly. Further, since the OCR 16 around the OCR 16 at the depressed portion is bonded to the upper substrate 10 and the lower substrate 20, the OCR 16 cannot move to the periphery. In FIG. As indicated by ′, the upper substrate 10 is displaced so as to rise around the portion to which the pressing force P is applied.
- the OCR 16 other than the columnar spacer Snp is semi-cured and is in contact with the upper substrate 10 and the lower substrate 20. The part which is done is not adhered. Therefore, the OCR 16 around the portion depressed by the pressing force P can easily flow as shown by a small arrow in FIG. Therefore, as shown by the solid line in FIG. 22 (B), the upper substrate 10 is bent so as to be recessed widely around the position where the pressing force P is applied.
- the portion other than the OCR spacer in the gap between the upper substrate 10 and the lower substrate 20 is not semi-cured gel state or sol state OCR but uncured liquid. Of course, it can be left as it is.
- the non-compressible (inelastic) uncured liquid is interposed between the spacers Snp instead of the weakly compressible (weakly elastic) semi-cured gel state or sol state OCR, the upper side Regarding the deflection displacement when the pressing force P is applied to the substrate 10, the same movement as described above is performed.
- the optical characteristics can be improved. it can.
- the spacer is formed by curing the transparent elastic material OCR from a liquid. That is, since the spacer and the liquid part of the transparent elastic material other than the spacer, or the part in the gel state or the sol state are originally OCRs of the same material, adjacent materials having different hardness (completely cured spacer part and semi-cured part or uncured part) The boundary physical property change of the liquid part) smoothly changes, and the elastic modulus and refractive index also smoothly change. For this reason, when the spacer and the liquid sealed in the gap between the upper substrate 10 and the lower substrate 20 are made of two different materials, a rapid change in elastic modulus and a rapid change in refractive index are likely to occur. There is an effect that it is difficult to be accompanied by fluctuations caused by a sudden change in physical properties at the boundary, such as reflection due to various changes.
- each state of the fully cured portion, the semi-cured portion, or the uncured portion of the OCR is laid out in a plane using a mask member, thereby
- the indicator detection sensor can be easily manufactured.
- by laying out in-plane using a mask member and appropriately selecting conditions such as the integrated amount of ultraviolet UV light, irradiation intensity, wavelength, etc. an arbitrary amount of change corresponding to the pressing force P and the contacted area is created.
- the description of the other embodiments of the indicator detection sensor described above is that four spacers are arranged at positions similar to the spacers Sa to Sd in the above-described embodiment in the central region of the cross-point region of the indicator detection sensor.
- the first manufacturing method and the second manufacturing method of the other embodiments of the indicator detection sensor described above are described as modified examples of the above-described embodiment, including those illustrated in FIG.
- the present invention can also be applied to other spacer arrangement examples and shape examples. In that case, of course, the shape and arrangement layout of the through holes of the mask member are formed in accordance with the shape and arrangement layout of the spacer to be formed.
- OCA Optical Clear Adhesive
- the signal reception circuit 300 is a circuit common to the first mode and the second mode, and the gain of the amplification circuit 31 is set to the first gain by the control circuit 40 in a time-sharing manner.
- the switching control is performed between the mode and the second mode, and the processing operation of the designated position and the press detection circuit 33 is controlled to be switched between the first mode and the second mode.
- the first mode and the second mode can always be operated in parallel.
- the signal receiving circuit 300 is configured by a first signal receiving circuit 300A for the first mode and a second signal receiving circuit 300B for the second mode. Signals from the respective reception conductors (second conductors 21Y) of the indicator detection sensor 1B are supplied in parallel to the first signal reception circuit 300A and the second signal reception circuit 300B for the second mode. To do.
- the first signal receiving circuit 300A for the first mode and the second signal receiving circuit 300B for the second mode are received in parallel from the receiving conductor. Signal processing can be performed according to each mode.
- control circuit 40 receives the selection operation input of one mode in the 1st mode or the 2nd mode by the user, and for the mode according to the selection operation input
- the signal receiving circuit may be configured so that the control circuit 40 can be operated and the operation of the signal receiving circuit for the other mode that has not been selected can be controlled to stop.
- the spacer is formed on the second conductor 21Y formed on the lower substrate 20, but the first is formed on the upper substrate 10. It may be formed on the other conductor 11X.
- the spacer is formed on the first conductor 11X formed on the upper substrate 10, but is formed on the lower substrate 20. It may be formed on the second conductor 21Y.
- the ultraviolet rays are irradiated from the upper substrate 10 side, but may be irradiated from the lower substrate 20 side.
- the conductor 11X arranged in the Y direction is the first conductor formed on the upper substrate 10 and the conductor 21Y arranged in the X direction is the lower substrate 20.
- the conductor 21Y disposed in the X direction is the first conductor formed on the upper substrate 10 and the conductor 11X disposed in the Y direction is formed on the lower substrate 20.
- the second conductor may be used.
- first conductor formed on the upper substrate 10 and the second conductor formed on the lower substrate 20 do not have to be orthogonal to each other, and the first conductor is formed so as to generate a cross-point region.
- the present invention is applicable as long as the first direction in which the second conductor is disposed intersects the second direction in which the second conductor is disposed to generate a cross-point region.
- the present invention is applicable not only to a planar shape but also to a curved shape as long as the upper substrate 10 and the lower substrate 20 are opposed to each other with a predetermined gap.
- the present invention Since the above embodiment is a case where the present invention is applied to a device with a display function, it has a configuration including an LCD as an example of a display device.
- the pointer detection apparatus according to the present invention includes a display device. The structure which is not provided may be sufficient.
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Abstract
Description
第1の方向に配置された複数の第1の導体と、前記第1の方向に対して交差する第2の方向に配置された複数の第2の導体とを所定の距離だけ離間して対向させて配設し、指示体による押圧により前記第1の導体と前記第2の導体との一方が撓んで、前記第1の導体と前記第2の導体との距離が変化することに基づいて前記第1の導体と前記第2の導体との間に形成される静電容量が変化する、静電容量方式による指示体検出センサと、
前記複数の第1の導体と前記複数の第2の導体との一方の複数の導体に所定の交流信号を供給するための交流信号供給回路と、
前記複数の第1の導体と前記複数の第2の導体との他方の複数の導体からの、前記所定の交流信号に対応する受信信号を検出する信号受信回路と、
制御回路と
を備え、
前記指示体検出センサは、
前記第1の導体と前記第2の導体とが交差して重なるクロスポイントの領域に、前記第1の導体と前記第2の導体との間に配設されたスペーサを備えており、
前記信号受信回路は、
導電性を有する第1の指示体が前記指示体検出センサに接近した位置及び前記第1の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第1のモードと、
導電性を有しない第2の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第2のモードと、
を有し、
前記制御回路は、
前記第1のモードと前記第2のモードにおける前記受信信号のゲインを制御する
を有することを特徴とする指示体検出装置を提供する。
特許文献2の指示体検出センサの構造では、スペーサSpが、クロスポイントの領域ではない、それぞれのクロスポイントの領域を囲む4隅の、上部導体7xと下部導体7yとの両方が形成されていない領域に形成されているために、以下のような問題があった。
以下に、この発明の実施形態の指示体検出装置について説明するが、ここでは、表示機能付タブレット装置、タブレット型情報端末あるいはパッド型情報端末などと呼ばれる表示機能付機器に、指示体検出装置を適用した場合を例にして説明する。
図1は、この実施形態の指示体検出装置1の構成の概略を説明するための分解斜視図である。この実施形態の指示体検出装置1は、表示機能付機器の構成である。図1に示すように、この実施形態の指示体検出装置1は、筐体1E内の最下層にマザーボード1Dが収納され、その上に表示画面を上側(フロントパネル1A側)にしてLCD(Liquid Crystal Display)1Cが設けられる。当該LCD1Cの表示画面側にこの発明の実施形態の指示体検出センサ1Bが設けられる。そして、指示体検出センサ1Bの上側にフロントパネル1Aが設けられ、上述の各収納物1D、1C、1Bが筐体1E内に保持される。
次に、指示体検出センサ1Bを含む指示体検出装置の構成例について説明する。図2は、この実施形態の指示体検出装置の構成例を説明するためのブロック図である。図2に示すように、この実施形態の指示体検出装置は、図1に示した指示体検出センサ1Bと、信号供給回路200と、信号受信回路300と、制御回路40とからなる。制御回路40は、この実施形態の指示体検出装置の各部を制御するための回路であり、例えばマイクロコンピュータを搭載して構成されている。
次に、指示体検出センサ1Bの構成例について、図3及び図4を参照しながら具体的に説明する。図3は、実施形態の指示体検出センサ1Bを、指示入力面1BS側から、当該指示入力面1BSに直交する方向から見た構成例を説明するための図であり、指示体検出センサ1Bの一部を示すである。図4は、実施形態の指示体検出センサ1Bの断面図であり、ここでは、図3におけるA-A断面図である。なお、図3に示す指示体検出センサ1Bでは、第1の導体11Xが配列された方向がX軸方向であり、第2の導体21Yが配列された方向がY軸方向である。なお、以下の説明においては、指示入力面1BS側を上側と称する。
C=ε・S/D …(式1)
という演算式で計算することができる。この実施形態では、(式1)の電極間の距離Dを特許文献2の場合に比べて小さくすることができるので、第1の導体11Xと、第2の導体21Yとの間に形成されるコンデンサの静電容量の値を、特許文献2の場合よりも大きくすることができる。
前述したように、上述の構成の指示体検出センサ1Bを備える指示体検出装置1においては、人の指や、いわゆる静電ペンからなる導電性を有する指示体による指示位置及び押圧力を検出する処理動作を行う第1のモード(静電対応モード)と、ゴム手袋をしたユーザの指や、導電性を有しないペン型の指示体による指示位置及び押圧力を検出する処理動作を行う第2のモード(非静電モード)とを、図13に示すように、所定時間T毎に交互に繰り返すように構成する。
指示体検出センサ1Bの上側基板10の表面である指示入力面1BS上に指などの指示体が存在しないときには、送信導体、この例では、第1の導体11Xに供給された送信信号(電圧信号)により、受信導体、この例では、第2の導体21Yと送信導体(第1の導体11X)とのクロスポイントの領域における静電容量Coに電流が流れる。その電流は第2の導体21Yに流れて、信号受信回路300に受信信号(電流信号)として供給される。これは、指示入力面1BSの全てのクロスポイントの領域において同様となるので、指示入力面1BS上に指や静電ペンなどの指示体が存在しないときには、第2の導体21Y1~21Ynの全てから、図15(A)に示すように、同レベル(同じ電流値)の受信信号が信号受信回路300に供給される。この状態は、第1のモードだけでなく、第2のモードにおいても同様であることは言うまでもない。
この第2のモードにおける検出対象の指示体は、前述したように導電体ではないので、指示体検出装置1では、第2のモードでは、指示体のホバーリング状態及び接触状態は検出できない。
信号受信回路300の制御回路40は、指示位置及び押圧力検出回路33における処理動作を、前述した所定時間T毎に、第1のモード用の処理動作と、第2のモード用の処理動作とに、時分割で切り替えるようにする。また、制御回路40は、第1のモードと、第2のモードとで、増幅回路31の利得(ゲイン)を変更するように制御する。
上述の実施形態の説明における指示体検出センサ1Bでは、スペーサとしては、クロスポイントの領域の中央の正方形の領域の4隅に、4個のスペーサSa~Sdを配設するようにした。しかし、スペーサは、クロスポイントの領域の中央領域に配置されていれば、上述の例に限られるものではなく、1個でも、また、上述の例のような複数個であってもよい。
上述の実施形態における指示体検出センサ1Bにおいては、上側基板10に形成された第1の導体11Xと、下側基板20に形成された第2の導体21Yとの間には、空気層を封入するようにした。しかし、上下の電極間の隙間が空気層である場合、その空気層で反射が起こり、光の透過率が下がる。光の透過率の減少は、指示体検出装置において、指示体検出センサの下部に配置されるLCDの表示画面の輝度を減少させるため、好ましくない。
先ず、スペーサを所定の高さまで形成する第1の製造方法の例について説明する。
上述の第1の製造方法は、スペーサが、上側基板10に形成された第1の導体あるいは下側基板20に形成された第2の導体のいずれか一方の上から、他方の導体には離間する所定の高さ分となるように形成される場合である。しかし、OCRは、硬化したときには、所定の弾性を有するようになるので、上側基板10に形成された第1の導体と下側基板20に形成された第2の導体との間を橋絡するようにスペーサを形成しても、指示体による押圧に対する上側基板10に形成された第1の導体と下側基板20に形成された第2の導体との距離変化の特性として、上述の実施形態と同様の特性が得られることが期待できる。
上述の実施形態の位置検出装置では、信号受信回路300を、第1のモードと第2のモードとで共通の回路として、制御回路40により、時分割で、増幅回路31のゲインを第1のモードと第2のモードとで切り替え制御すると共に、指示位置及び押圧検出回路33の処理動作を、第1のモードと第2のモードとで切り替え制御するようにした。
Claims (7)
- 第1の方向に配置された複数の第1の導体と、前記第1の方向に対して交差する第2の方向に配置された複数の第2の導体とを所定の距離だけ離間して対向させて配設し、指示体による押圧により前記第1の導体と前記第2の導体との一方が撓んで、前記第1の導体と前記第2の導体との距離が変化することに基づいて前記第1の導体と前記第2の導体との間に形成される静電容量が変化する、静電容量方式による指示体検出センサと、
前記複数の第1の導体と前記複数の第2の導体との一方の複数の導体に所定の交流信号を供給するための交流信号供給回路と、
前記複数の第1の導体と前記複数の第2の導体との他方の複数の導体からの、前記所定の交流信号に対応する受信信号を検出する信号受信回路と、
制御回路と
を備え、
前記指示体検出センサは、
前記第1の導体と前記第2の導体とが交差して重なるクロスポイントの領域に、前記第1の導体と前記第2の導体との間に配設されたスペーサを備えており、
前記信号受信回路は、
導電性を有する第1の指示体が前記指示体検出センサに接近した位置及び前記第1の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第1のモードと、
導電性を有しない第2の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第2のモードと、
を有し、
前記制御回路は、
前記第1のモードと前記第2のモードにおける前記受信信号のゲインを制御する
ことを特徴とする指示体検出装置。 - 前記制御回路は、前記信号受信回路の前記第1のモードと、前記第2のモードとを、時分割で行うように制御する
ことを特徴とする請求項1に記載の指示体検出装置。 - 前記制御回路は、前記信号受信回路の前記第1のモードにおける前記受信信号のゲインを、前記第2のモードにおける前記受信信号のゲインよりも大きくするように制御する
ことを特徴とする請求項1に記載の指示体検出装置。 - 前記信号受信回路は、前記第1のモードで動作する第1の信号受信回路と、前記第2のモードで動作する第2の信号受信回路とを備え、前記第1の信号受信回路と、前記第2の受信回路とを、並列に実行する
ことを特徴とする請求項1に記載の指示体検出装置。 - 前記制御回路は、前記信号受信回路の前記第1のモードと前記第2のモードとを、切り替え操作入力に応じて切り替えるように制御する
ことを特徴とする請求項1に記載の指示体検出装置。 - 前記指示体検出センサは、前記スペーサが、前記クロスポイントの領域の中央領域に形成されているものである
ことを特徴とする請求項1に記載の指示体検出装置。 - 指示体検出センサと、交流信号供給回路と、信号受信回路と、制御回路とを備える指示体検出装置における指示体検出方法であって、
前記指示体検出センサは、
第1の方向に配置された複数の第1の導体と、前記第1の方向に対して交差する第2の方向に配置された複数の第2の導体とを所定の距離だけ離間して対向させて配設し、指示体による押圧により前記第1の導体と前記第2の導体との一方が撓んで、前記第1の導体と前記第2の導体との距離が変化することに基づいて前記第1の導体と前記第2の導体との間に形成される静電容量が変化するものであると共に、前記第1の導体と前記第2の導体とが交差して重なるクロスポイントの領域に、前記第1の導体と前記第2の導体との間に配設されたスペーサを備えており、
前記交流信号供給回路が、前記複数の第1の導体と前記複数の第2の導体との一方の複数の導体に所定の交流信号を供給する工程と、
前記信号受信回路が、前記複数の第1の導体と前記複数の第2の導体との他方の複数の導体からの、前記所定の交流信号に対応する受信信号を検出する工程であって、導電性を有する第1の指示体が前記指示体検出センサに接近した位置及び前記第1の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第1のモードを実行する工程と、導電性を有しない第2の指示体が前記指示体検出センサを押圧した位置を、前記第1の導体と前記第2の導体との間に形成される静電容量の変化に基づいて検出する第2のモードを実行する工程とを含む工程と、
前記制御回路が、前記第1のモードと前記第2のモードにおける前記受信信号のゲインを制御する工程と
を有することを特徴とする指示体検出方法。
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Also Published As
Publication number | Publication date |
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JP5676065B1 (ja) | 2015-02-25 |
EP2998839A4 (en) | 2016-11-16 |
CN105103102B (zh) | 2018-12-21 |
TW201523404A (zh) | 2015-06-16 |
JPWO2015022940A1 (ja) | 2017-03-02 |
TWI625664B (zh) | 2018-06-01 |
US20160239108A1 (en) | 2016-08-18 |
US9513725B2 (en) | 2016-12-06 |
JP2015057742A (ja) | 2015-03-26 |
CN105103102A (zh) | 2015-11-25 |
JP6323953B2 (ja) | 2018-05-16 |
EP2998839A1 (en) | 2016-03-23 |
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