JP3277896B2 - Capacitance coordinate detection device that also serves as pressure detection - Google Patents
Capacitance coordinate detection device that also serves as pressure detectionInfo
- Publication number
- JP3277896B2 JP3277896B2 JP22999398A JP22999398A JP3277896B2 JP 3277896 B2 JP3277896 B2 JP 3277896B2 JP 22999398 A JP22999398 A JP 22999398A JP 22999398 A JP22999398 A JP 22999398A JP 3277896 B2 JP3277896 B2 JP 3277896B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- sensor
- pressure detection
- reference potential
- capacitance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は静電容量式座標検出装置
に関し、特に指又は導電スタイラスにより座標指示する
ものであり指等の押圧をも検出する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic capacitance type coordinate detecting device, and more particularly to a device which designates coordinates by a finger or a conductive stylus and detects pressing of a finger or the like.
【０００２】[0002]
【従来の技術】抵抗性パネルの４隅を演算増幅器により
電圧駆動し、同時に駆動電流を差動増幅器で検出する例
として特許第１５３６７２３号に示されたものがある。
また、指との結合容量を含めてパネルの格子状導体のキ
ャパシタンスの変化を検出する例として、特許第１７５
４５２２号及び同第２０３７７４７号に示されたものが
ある。または、指との結合容量を含めて抵抗性パネルの
インピーダンスを検出する例として、特許第２６０３９
８６号に示されたものがある。他の例として、変成器に
より、タッチパネルの４点をＡＣ電圧駆動し、同時に駆
動電流成分を差動増幅器へ印加する例として特許第１８
８１２０８号に示された指の座標検出装置がある。2. Description of the Related Art Japanese Patent No. 1536723 discloses an example in which four corners of a resistive panel are driven by an operational amplifier and a driving current is simultaneously detected by a differential amplifier.
As an example of detecting a change in capacitance of a grid-like conductor of a panel including a coupling capacitance with a finger, see Japanese Patent No. 175/175.
No. 4,522 and No. 2,037,747. Alternatively, as an example of detecting the impedance of a resistive panel including a coupling capacitance with a finger, see Japanese Patent No. 26039.
No. 86. As another example, Patent Document 18 discloses an example in which four points of a touch panel are driven by an AC voltage by a transformer and a driving current component is simultaneously applied to a differential amplifier.
No. 81208 discloses a finger coordinate detecting device.
【０００３】[0003]
【発明が解決しようとする課題】上記の従来の技術にお
いては、座標検出のみ可能であり、指又は導電スタイラ
スのパネル面への押圧をも検出するものではなかった。
また押圧を検出するためには独立した押圧検出機構を布
設する必要があった。In the above-mentioned prior art, only the coordinate detection is possible, and the pressing of the finger or the conductive stylus against the panel surface is not detected.
Further, in order to detect the pressing, it is necessary to lay an independent pressing detecting mechanism.
【０００４】[0004]
【課題を解決するための手段】本発明は如上の課題に鑑
みなされたもので、押圧による、シールド導体または枠
状導体とセンサー導体間の微少な容量変化に従った、押
圧検出用信号の微少な電流変化から押圧をも検出する、
静電容量式座標検出装置とした。尚、本出願において、
必要充分な電流を流し得る抵抗体は導体に含めた。SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has been made in consideration of the above circumstances. Detects pressure from various current changes,
The capacitance type coordinate detection device was used. In this application,
A resistor capable of passing a necessary and sufficient current was included in the conductor.
【０００５】[0005]
【作用】静電容量式座標検出装置において、通常、外部
から混入するノイズを防止する為に、センサー導体の背
面にシールド導体を配設する。この両者間には浮遊容量
（ストレーキャパシティー）があり、従来は悪影響の要
因でありこの浮遊容量のメリットはなかった。しかし、
押圧によりセンサー導体とシールド導体間の距離が微少
に変化することに着目した。従って上述の浮遊容量が微
少ではあるが変化する。浮遊容量のこの微少変化を積極
的に利用し、そこに強制的に流す押圧検出用信号電流の
微小変化を検出する。 In a capacitance type coordinate detecting device, a shield conductor is usually provided on the back surface of a sensor conductor in order to prevent noise from entering from the outside. Stray capacitance between the two
(Storage capacity), which has conventionally been a factor of adverse effects and has no merit of this stray capacitance . But,
It was noted that the distance between the sensor conductor and the shield conductor was slightly changed by the pressing. Therefore, the above-mentioned stray capacitance changes although it is very small. Aggressive to this small change in stray capacitance
Of the pressure detection signal current
Detect small changes.
【０００６】[0006]
【発明の実施の形態】独立した押圧検出機構を使用せず
に、センサー導体とシールド導体とが構造上一体化され
たセンサーパネルを使用する静電容量式座標検出装置
の、座標検出のための構成要素の一部を共用して押圧を
も検出するものであり、座標検出と押圧検出を時分割で
行う装置、または両信号の周波数を互いに異ならせて、
同時に両検出を行う装置としたものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sensor conductor and a shield conductor are structurally integrated without using an independent pressure detection mechanism.
Capacitive coordinate detection device using a sensor panel, which also detects pressure by sharing some of the components for coordinate detection, a device that performs coordinate detection and pressure detection in a time-division manner, Alternatively, make the frequencies of both signals different from each other,
It is a device that performs both detections at the same time.
【０００７】[0007]
【実施例】以下本発明の詳細を添付図面を参照して説明
する。図１は、センサー導体として均一な抵抗膜を使用
した、押圧検出兼用静電容量式座標検出装置の構成概要
図である。先ず座標検出の概要を説明する。スイッチ１
０はこの時図の下側に接続され、シールド導体２は基準
電位７（この時の基準電位は動的な基準電位であり座標
検出用のＡＣ信号成分を含む）に接続されている。シー
ルド導体２の前面にセンサー導体としてのセンサー抵抗
膜１があり、シールド導体２に近い距離で平行に配設さ
れている。このセンサー抵抗膜１とシールド導体２でセ
ンサーパネルを構成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a configuration of a capacitance detection device for capacitance detection using both pressure detection and a uniform resistance film as a sensor conductor. First, an outline of coordinate detection will be described. Switch 1
0 is connected to the lower side of the figure at this time, and the shield conductor 2 is connected to a reference potential 7 (the reference potential at this time is a dynamic reference potential and includes an AC signal component for coordinate detection). A sensor resistance film 1 as a sensor conductor is provided on the front surface of the shield conductor 2, and is disposed in parallel at a distance close to the shield conductor 2. The sensor resistance film 1 and the shield conductor 2 constitute a sensor panel.
【０００８】センサーパネルの実際の構造（断面図）を
図２に示す。透明なガラス、樹脂、または不透明な絶縁
基板２１の片面に、どの方向にも均一に分布した抵抗膜
２２（センサー抵抗膜）を塗布、蒸着等により形成す
る。抵抗膜２２の材料は透明を必要とする場合はＩＴＯ
（インジウム・ティン・オキサイド）膜、ＮＥＳＡ（酸
化錫）膜等であり、不透明なものはカーボン膜等であ
る。シールド導体２３も同様に絶縁基板２４の片面にシ
ールド導体２３を形成する。シールド導体２３は必ずし
も抵抗膜である必要はない。センサー抵抗膜２２とシー
ルド導体２３間は０．５ｍｍ厚程度の空気層２５があ
る。FIG. 2 shows the actual structure (cross-sectional view) of the sensor panel. A resistive film 22 (sensor resistive film) uniformly distributed in any direction is formed on one surface of a transparent glass, resin, or opaque insulating substrate 21 by coating, vapor deposition, or the like. When the material of the resistance film 22 needs to be transparent, ITO
(Indium tin oxide) film, NESA (tin oxide) film and the like, and opaque ones are carbon films and the like. Similarly, the shield conductor 23 is formed on one surface of the insulating substrate 24. The shield conductor 23 does not necessarily need to be a resistive film. There is an air layer 25 having a thickness of about 0.5 mm between the sensor resistance film 22 and the shield conductor 23.
【０００９】センサー抵抗膜１の４隅からは引き出し線
８が出ており信号処理部３に接続されている。信号処理
部３は２つの電圧基準を使用しており、それは回路グラ
ンド６と動的な基準電位７である。信号処理部３の４つ
の入力回路は基準電位７に対して充分な低インピーダン
スにしてあり、従ってセンサー抵抗膜１全体は、基準電
位７に動的に電位追従する。つまり、基準電位７が、い
ま、座標検出用のＡＣ信号成分を含むので、センサー抵
抗膜１も同じ信号成分を含む。Lead lines 8 extend from four corners of the sensor resistance film 1 and are connected to the signal processing unit 3. The signal processing unit 3 uses two voltage references, a circuit ground 6 and a dynamic reference potential 7. The four input circuits of the signal processing section 3 have a sufficiently low impedance with respect to the reference potential 7, so that the entire sensor resistance film 1 dynamically follows the reference potential 7. That is, since the reference potential 7 now includes the AC signal component for coordinate detection, the sensor resistance film 1 also includes the same signal component.
【００１０】人体は通常、擬似的に接地されており、そ
の人体の指５又は手に持つ導電スタイラス（図示せず）
と、センサー抵抗膜１間には小容量ではあるが図１に示
すように静電容量結合４が存在し、従って指５とセンサ
ー抵抗膜１間に、動的な電位差に従い、座標検出用信号
による電流が少しではあるが流れる。センサー抵抗膜１
は均一な抵抗値の分布をしており、指５の先端に近い引
き出し線８に、より多くの検出電流が流れる。従って、
信号処理部３の４接続点に流れる電流の量から、センサ
ーパネルの面上における、指５等の座標を検出すること
ができる。The human body is normally quasi-grounded, and a conductive stylus (not shown) held by the finger 5 or hand of the human body
Although there is a small capacitance between the sensor resistive film 1 and the capacitive coupling 4 as shown in FIG. 1, a coordinate detection signal is generated between the finger 5 and the sensor resistive film 1 according to a dynamic potential difference. A small amount of current flows. Sensor resistance film 1
Has a uniform resistance value distribution, and more detection current flows through the lead wire 8 near the tip of the finger 5. Therefore,
The coordinates of the finger 5 or the like on the surface of the sensor panel can be detected from the amount of current flowing through the four connection points of the signal processing unit 3.
【００１１】センサー抵抗膜１の周囲を低抵抗の電極と
したり、センサー抵抗膜１の４隅だけでなくもっと多く
の周辺点へ引き出し線をつける等により、検出座標の算
出精度を向上させることもできる。しかし本出願の主旨
とかけ離れるのでその説明は省略する。It is also possible to improve the calculation accuracy of the detection coordinates by using low-resistance electrodes around the sensor resistance film 1 and providing lead lines not only at the four corners of the sensor resistance film 1 but also at more peripheral points. it can. However, the description is omitted because it is far from the gist of the present application.
【００１２】次に図１に示す装置での押圧検出について
説明する。スイッチ１０はこの時、図の上側に接続さ
れ、シールド導体２は押圧検出用信号発生器９の出力が
印加される。この場合の信号発生器９の出力電圧はＡＣ
約１Ｖｐｐである。また、この時基準電位７は静的な定
電圧となり、センサー抵抗膜１も静的な定電圧となり、
従って指５との間の、前述の座標用信号電流も基本的に
無い。しかし、シールド導体２とセンサー抵抗膜１間に
は大きな容量があり、シールド導体２のＡＣ電圧から、
センサー抵抗膜１へこの容量を介してＡＣ電流が流れ
る。因みに図２に示す構造のガラス基板２１の場合で、
１８×２５ｃｍのセンサーパネルサイズの時、約５００
ｐＦであり、充分に大きな押圧検出用信号電流が流れ
る。Next, detection of pressure by the apparatus shown in FIG. 1 will be described. At this time, the switch 10 is connected to the upper side of the figure, and the output of the pressure detection signal generator 9 is applied to the shield conductor 2. In this case, the output voltage of the signal generator 9 is AC
It is about 1 Vpp. At this time, the reference potential 7 becomes a static constant voltage, and the sensor resistance film 1 also becomes a static constant voltage.
Accordingly, there is basically no signal current for coordinates described above between the finger 5. However, there is a large capacitance between the shield conductor 2 and the sensor resistance film 1, and the AC voltage of the shield conductor 2
An AC current flows to the sensor resistance film 1 via this capacitance. Incidentally, in the case of the glass substrate 21 having the structure shown in FIG.
When the sensor panel size is 18 × 25cm, about 500
pF, and a sufficiently large pressure detection signal current flows.
【００１３】指５等がセンサーパネル面を押圧すると、
表面の絶縁基板２１が撓み、センサー抵抗膜１とシール
ド導体２間の容量が微少ではあるが変化する。上記サイ
ズのセンサーパネルで０．７ｍｍ厚のガラス基板２１の
場合、中央部を５０ｇＷ（約０．５Ｎ）で押圧した時、
約０．３％の容量変化であった。つまり、約０．３％の
押圧検出用信号電流の変化が生じた。図１に示す装置の
４本の引き出し線８に流れる電流の合計で０．３％の変
化である。これを検出するには、信号のＳ／Ｎ比は少な
くとも６０ｄＢは必要であり、１０ビット以上のＡ／Ｄ
変換の分解能を必要とする。本実施例において、信号の
バンドパスフィルタリングと複数回のＡ／Ｄ変換により
必要なＳ／Ｎ比を得ている。When the finger 5 presses the sensor panel surface,
The insulating substrate 21 on the surface bends, and the capacitance between the sensor resistance film 1 and the shield conductor 2 changes, though it is very small. In the case of a sensor panel of the above size and a glass substrate 21 having a thickness of 0.7 mm, when the central part is pressed at 50 gW (about 0.5 N),
The capacity change was about 0.3%. That is, a change in the pressure detection signal current of about 0.3% occurred. The change in the total current flowing through the four lead wires 8 of the device shown in FIG. 1 is 0.3%. To detect this, the S / N ratio of the signal must be at least 60 dB, and the A / D
Requires conversion resolution. In this embodiment, a required S / N ratio is obtained by band-pass filtering of a signal and A / D conversion a plurality of times.
【００１４】座標検出と押圧検出とを時分割で行う例で
説明したが、座標検出用と押圧検出用信号の周波数を互
いに異ならせて、フィルタにより信号を分けて同時検出
を行うことも、回路の線型性がある為に可能である。そ
の場合はスイッチ１０は不要である。In the above description, the coordinate detection and the pressure detection are performed in a time-division manner. However, it is also possible to make the frequency of the coordinate detection signal and the pressure detection signal different from each other and separate the signals by a filter to perform the simultaneous detection. Is possible because of the linearity of In that case, the switch 10 is unnecessary.
【００１５】次に図３に示す、格子状のセンサー導体ア
レイを使用した、押圧検出兼用静電容量式座標検出装置
について説明する。座標検出をする場合は、Ｘ方向及び
Ｙ方向のアナログ・マルチプレクサ３３及び３４が、Ｘ
方向及びＹ方向座標検出用センサー導体アレイ３１，・
・・・・，３１及び３２，・・・・，３２を順次切り替
えて、信号処理部３５へ接続する。各センサー導体３
１，・・・・，３２，・・・に流れる座標用信号電流の
レベルから、指等の導電体のセンサーパネル上の座標を
信号処理部３５が算出する。隣り合う各センサー導体３
１，３１間及び３２，３２間のみをアナログ的に座標補
間すればよいので、検出座標の絶対精度は図１のものよ
り良い。基準電位７及びスイッチ１０の動作は図１に示
す装置と同じである。Ｘ方向及びＹ方向座標検出用セン
サー導体アレイ３１，・・・，３１及び３２，・・・
・，３２とシールド導体２で構成される部分が、この場
合のセンサーパネルである。Next, a description will be given of a pressure detection and capacitance type coordinate detection apparatus using a grid-like sensor conductor array shown in FIG. When performing coordinate detection, the analog multiplexers 33 and 34 in the X direction and the Y direction
Sensor conductor array 31 for detecting the direction and Y direction coordinates,
, 31 and 32, ..., 32 are sequentially switched to connect to the signal processing unit 35. Each sensor conductor 3
, 32,..., The signal processing unit 35 calculates the coordinates of the conductor such as a finger on the sensor panel from the levels of the coordinate signal currents flowing through the signals. Each adjacent sensor conductor 3
Only between 1 and 31 and between 32, 32 than may be analogically coordinate interpolation, absolute accuracy of the detection coordinates is better than that of FIG. The operations of the reference potential 7 and the switch 10 are the same as those of the device shown in FIG. , 31 and 32,...
., 32 and the shield conductor 2 are the sensor panel in this case.
【００１６】押圧検出を行う場合は、Ｘ方向及びＹ方向
のアナログ・マルチプレクサ３３及び３４の全てのアナ
ログ入出力端子をＯＮに（導通状態）にする。従って、
シールド導体２と全センサー導体３１，・・・，３２，
・・・間の容量の、押圧による変化に従った、押圧検出
用信号電流の変化を、図１に示す装置と同様に検出して
いる。各センサー導体アレイ毎の電流変化分を合計して
も、押圧検出は可能である。[0016] When performing a pressing detection, all of the analog input output terminals of the X and Y directions of the analog multiplexer 33 and 34 to ON to (conductive state). Therefore,
Shield conductor 2 and all sensor conductors 31, 32,
The change in the signal current for press detection according to the change due to the press of the capacitance between... Is detected in the same manner as in the device shown in FIG. Pressing detection is possible even if the current change for each sensor conductor array is summed.
【００１７】次に図２に示す空気層２５を、酢酸ビニー
ル系接着剤のような、わずかな弾力性を持つ接着剤の薄
い接着層で置き替えて、透明度を増す、または機械的に
丈夫にする場合について説明する。この場合のシールド
導体２とセンサー抵抗膜１間の、押圧による容量変化は
非常に少なく、段落１３に示すセンサーパネルの空気層
を０．２５ｍｍ厚さの酢酸ビニール系接着剤に置き替え
た時、５０ｇＷ（約０．５Ｎ）の押圧による容量変化は
約１５ｐｐｍである。１５ｐｐｍの電流変化を検出する
には、１０６ｄＢ以上のＳ／Ｎ比と１８ビット以上のＡ
／Ｄ変換の分解能を少なくとも必要とする。これは非常
に困難である。しかし容量は約２５００ｐＦに増加し
た。[0017] The following air layer 25 shown in FIG. 2, such as vinyl acetate-based adhesive, instead can sit at thin adhesive bonding layer having a slight elasticity, increased transparency or mechanically robust Will be described. In this case, the capacitance change due to the pressure between the shield conductor 2 and the sensor resistance film 1 is very small, and when the air layer of the sensor panel shown in paragraph 13 is replaced with a 0.25 mm thick vinyl acetate adhesive, The change in capacity due to the pressing of 50 gW (about 0.5 N) is about 15 ppm. To detect a current change of 15 ppm, an S / N ratio of 106 dB or more and an A /
It requires at least the resolution of the / D conversion. This is very difficult. However, the capacitance increased to about 2500 pF.
【００１８】１５ｐｐｍの電流変化の検出を、比較的簡
単に実現した実施例を次に説明する。その１つの例を図
４を参照して説明する。センサーパネル４１を図４に示
すように等価回路で表わす。信号処理部３の４入力点
の、押圧検出用信号周波数での入力インピーダンスは充
分に低いので、シールド導体２の電圧位相に比し、セン
サー抵抗膜１の４出力電流位相は約８５度進んでいる。
９０度にならないのはセンサー抵抗膜１が抵抗成分を図
示するように含んでいる為である。Next, a description will be given of an embodiment in which the detection of the change in the current of 15 ppm is relatively easily realized. One example will be described with reference to FIG. The sensor panel 41 is represented by an equivalent circuit as shown in FIG. Since the input impedance of the four input points of the signal processing unit 3 at the signal frequency for pressure detection is sufficiently low, the four output current phases of the sensor resistance film 1 advance by about 85 degrees compared to the voltage phase of the shield conductor 2. I have.
The angle does not become 90 degrees because the sensor resistance film 1 includes a resistance component as shown in the figure.
【００１９】参照符号４６に示す回路は、電圧位相を約
９５度遅らせる為のディレー回路である。抵抗４２〜４
５は電圧／電流変換用であり且つセンサー抵抗膜１の出
力電流とバランスを取る抵抗値である。つまり、センサ
ー抵抗膜１の出力電流位相と、抵抗４２〜４５を流れる
電流の位相が、互いに反転しており、且つ電流の絶対値
は略等しいので、信号処理部３に流入する電流は略キャ
ンセルされる。しかし、シールド導体２とセンサー抵抗
膜１間の容量の変化に従った電流変化分は、キャンセル
されずに、そのまま信号処理部３に印加する。The circuit indicated by reference numeral 46 is a delay circuit for delaying the voltage phase by about 95 degrees. Resistance 42-4
Reference numeral 5 denotes a resistance value for voltage / current conversion, which balances the output current of the sensor resistance film 1. That is, since the output current phase of the sensor resistance film 1 and the phase of the current flowing through the resistors 42 to 45 are inverted with each other and the absolute values of the currents are substantially equal, the current flowing into the signal processing unit 3 is substantially canceled. Is done. However, a change in current according to a change in capacitance between the shield conductor 2 and the sensor resistance film 1 is applied to the signal processing unit 3 without being canceled.
【００２０】このように、一種のブリッジバランス法に
より押圧検出用信号の定常成分を略キャンセルできた為
に、信号処理部３への変動入力レベルを約１００倍にし
ても飽和することはない。すなわち、ブリッジバランス
された後のＳ／Ｎ比は６６ｄＢ以上で、且つＡ／Ｄ変換
の分解能は１１ビット以上で、一応変動電流成分を検出
できた。As described above, since the steady-state component of the pressure detection signal can be almost canceled by a kind of bridge balance method, the signal does not saturate even if the fluctuation input level to the signal processing unit 3 is about 100 times. That is, the S / N ratio after the bridge balance was 66 dB or more, and the resolution of the A / D conversion was 11 bits or more, and a fluctuating current component could be detected for the time being.
【００２１】ブリッジバランスによる次の実施例を図５
に示す。コンデンサ５１と抵抗５２の回路は約８５度電
圧位相を進める進相回路であり、抵抗５３とコンデンサ
５４の回路は電圧位相を約１０度遅らせるディレー回路
である。抵抗５５〜５８は前例と同様な電流バランス用
抵抗である。この例もやはり信号処理部３への変動レベ
ルを約１００倍にできた。FIG. 5 shows the next embodiment using bridge balance.
Shown in The circuit of the capacitor 51 and the resistor 52 is a phase advance circuit which advances the voltage phase by about 85 degrees, and the circuit of the resistor 53 and the capacitor 54 is a delay circuit which delays the voltage phase by about 10 degrees. The resistors 55 to 58 are current balancing resistors similar to the previous example. Also in this example, the fluctuation level to the signal processing unit 3 could be increased about 100 times.
【００２２】ブリッジバランスによる次の実施例を図６
に示す。この例ではブリッジバランスの為にアクティブ
素子６５（位相反転アンプ）を１個使用している。これ
とフィードバック（積分）コンデンサ６４及び抵抗６３
により９０度電圧位相が進む。またコンデンサ６２と抵
抗６３により約５度の進相を行い、参照符号６１の回路
で約９５度の進相を行っている。抵抗６６〜６９はやは
り前例と同様の電流バランス用抵抗である。この回路の
特徴は、任意の波形の入力電圧に対して、センサーパネ
ル４１の各出力電流波形は、形は入力波形と全く同じで
極性が反転している。つまり、押圧検出用信号発生器９
は正弦波に限らず、歪みのある（高調波を含んだ）信号
でも、または一定の繰り返しのパルス状信号でも使用で
きる。また、押圧検出用信号発生器９の出力電圧は比較
的低い１〜２Ｖｐｐで、信号処理部３へ押圧による充分
な変化電流を印加できた。FIG. 6 shows the next embodiment using bridge balance.
Shown in In this example, one active element 65 (phase inversion amplifier) is used for bridge balance. This and feedback (integration) capacitor 64 and resistor 63
Advances the voltage phase by 90 degrees. The phase advance of about 5 degrees is performed by the capacitor 62 and the resistor 63, and the phase of the circuit 61 is advanced by about 95 degrees. The resistors 66 to 69 are also current balancing resistors similar to the previous example. The feature of this circuit is that, for an input voltage having an arbitrary waveform, the output current waveform of the sensor panel 41 has exactly the same shape as the input waveform and the polarity is inverted. That is, the pressure detection signal generator 9
Is not limited to a sine wave, but may be used for a distorted (including harmonic) signal or a pulse signal having a constant repetition. In addition, the output voltage of the pressure detection signal generator 9 was relatively low at 1 to 2 Vpp, and a sufficient change current due to the pressure could be applied to the signal processing unit 3.
【００２３】より透明度を多くし、シールド導体２を必
要としない場合は、シールド導体２の周辺部のみ残しそ
の内側を抜き取った形の枠状導体を、多少の弾性を持つ
絶縁スペーサを挟んで配設した装置でも同様の各機能を
示し得ることを 確認している。When the transparency is further increased and the shield conductor 2 is not required, a frame-like conductor in which only the periphery of the shield conductor 2 is left and the inside thereof is removed is disposed with an insulating spacer having some elasticity therebetween. It has been confirmed that the installed device can also exhibit the same functions.
【００２４】[0024]
【発明の効果】座標検出用の構成体または機能を共用し
て、低コストで且つセンサーパネルを厚くすることな
く、シンプルな構成で押圧をも連続量として検出する、
指または導電スタイラスの座標検出装置を得た。また、
押圧の連続量でなく２値化して検出した時は、座標のタ
ッチ入力の信頼性を大きく向上することができた。According to the present invention, the structure or function for coordinate detection is shared, and the pressure is detected as a continuous amount with a simple configuration at a low cost without increasing the thickness of the sensor panel.
A finger or conductive stylus coordinate detector was obtained. Also,
When binarization was detected instead of the continuous amount of pressing, the reliability of touch input of coordinates could be greatly improved.
【図１】 均一な抵抗膜を使用した、押圧検出兼用静電
容量式座標検出装置の構成概略図FIG. 1 is a schematic diagram of a configuration of an electrostatic capacitance type coordinate detection device that uses both a pressure detection and a uniform resistance film.
【図２】 センサー抵抗膜とシールド導体の断面図（構
造図）FIG. 2 is a cross-sectional view (structure diagram) of a sensor resistance film and a shield conductor.
【図３】 格子状のセンサー導体アレイを使用した、押
圧検出兼用静電容量式座標検出装置の構成概略図FIG. 3 is a schematic diagram of a configuration of a capacitance detection device for capacitance detection using pressure detection, which uses a grid-like sensor conductor array.
【図４】 ブリッジバランスにより押圧検出用信号の
定常成分を略キャンセルした回路例１FIG. 4 is a circuit example 1 in which a steady component of a pressure detection signal is substantially canceled by a bridge balance.
【図５】 ブリッジバランスにより押圧検出用信号の
定常成分を略キャンセルした回路例２FIG. 5 is a circuit example 2 in which a steady component of the pressure detection signal is substantially canceled by the bridge balance.
【図６】 ブリッジバランスにより押圧検出用信号の
定常成分を略キャンセルした回路例３FIG. 6 is a circuit example 3 in which a steady component of the pressure detection signal is substantially canceled by the bridge balance.
１ センサー抵抗膜 ２ シールド導体 ３ 信号処理部 ４ 結合容量 ５ 指 ６ 回路グランド ７ 静的または動的な基準電位 ８ 引き出し線 ９ 押圧検出用信号発生器 １０ スイッチ １１ 絶縁基板 ２２ センサー抵抗膜 ２３ シールド導体 ２４ 絶縁基板 ２５ 空気層 ３１ Ｘ方向検出用センサー導体アレイ ３２ Ｙ方向検出用センサー導体アレイ ３３ Ｘ方向アナログ・マルチプレクサ ３４ Ｙ方向アナログ・マルチプレクサ ３５ 信号処理部 ４１ センサーパネル ４２ 電流バランス用抵抗 ４３ 電流バランス用抵抗 ４４ 電流バランス用抵抗 ４５ 電流バランス用抵抗 ４６ 約９５度の位相ディレー回路 ４７ ディレー抵抗 ４８ ディレー抵抗 ４９ ディレーコンデンサ ５０ ディレーコンデンサ ５１ 進相コンデンサ ５２ 進相抵抗 ５３ ディレー抵抗 ５４ ディレーコンデンサ ５５ 電流バランス用抵抗 ５６ 電流バランス用抵抗 ５７ 電流バランス用抵抗 ５８ 電流バランス用抵抗 ６１ 約９５度の進相回路 ６２ 進相コンデンサ ６３ 抵抗 ６４ フィードバック（積分）コンデンサ ６５ 位相反転アンプ ６６ 電流バランス用抵抗 ６７ 電流バランス用抵抗 ６８ 電流バランス用抵抗 ６９ 電流バランス用抵抗 DESCRIPTION OF SYMBOLS 1 Sensor resistance film 2 Shield conductor 3 Signal processing part 4 Coupling capacity 5 Finger 6 Circuit ground 7 Static or dynamic reference potential 8 Lead wire 9 Press detection signal generator 10 Switch 11 Insulating substrate 22 Sensor resistance film 23 Shield conductor Reference Signs List 24 Insulating substrate 25 Air layer 31 Sensor conductor array for X direction detection 32 Sensor conductor array for Y direction detection 33 X direction analog multiplexer 34 Y direction analog multiplexer 35 Signal processing unit 41 Sensor panel 42 Current balance resistor 43 Current balance Resistor 44 Current balance resistor 45 Current balance resistor 46 Approximately 95 degree phase delay circuit 47 Delay resistor 48 Delay resistor 49 Delay capacitor 50 Delay capacitor 51 Lead capacitor 52 Lead resistor 53 Delay resistor 54 Delay capacitor 55 Current balance resistor 56 Current balance resistor 57 Current balance resistor 58 Current balance resistor 61 Approximately 95 degree phase advance circuit 62 Phase advance capacitor 63 Resistance 64 Feedback (integration) capacitor 65 Phase inverting amplifier 66 Current balance Resistor 67 Current balance resistor 68 Current balance resistor 69 Current balance resistor
Claims (4)
ルの面上に於ける押圧兼座標を検出する装置であって、
前記指又は導電スタイラスとの間で静電容量結合を介し
て電気信号を伝達するセンサー導体と該センサー導体と
平行に配設されたシールド導体とを機構上一体化した前
記センサーパネルと、前記センサー導体を、座標用信号
成分を含む動的基準電位に対して動的に電位追従させる
と共に、前記センサー導体に流れる電流に基づき前記押
圧兼座標を算出する信号処理部と、前記シールド導体を
電圧駆動するための、前記動的基準電位に電圧重畳する
押圧検出用信号発生器とを少なくとも具備し、座標検出
に関しては、前記シールド導体を前記動的基準電位に電
位追従させるか、あるいは前記押圧検出用信号発生器の
周波数を前記座標用信号成分と異なる周波数にして、前
記座標を前記信号処理部が算出し、また、押圧検出に関
しては、前記動的基準電位を静的な定電位に保持し前記
シールド導体を前記押圧検出用信号発生器で直接又は間
接的に駆動するか、あるいは前記動的基準電位は動的の
ままで前記押圧検出用信号発生器の周波数を前記座標用
信号成分と異なる周波数にして、前記押圧により発生し
た前記センサー導体と前記シールド導体間の容量変化に
従った、押圧検出用信号の電流変化から前記押圧を前記
信号処理部が算出することを特徴とする押圧検出兼用静
電容量式座標検出装置。1. An apparatus for detecting a pressing and a coordinate of a finger or a conductive stylus on a surface of a sensor panel,
<br/> Symbol pre-sensor that combines the mechanism and sensor conductor and the sensor conductor and disposed parallel to the shield conductor for transmitting electrical signals through the capacitive coupling between the finger or conductive stylus The panel and the sensor conductor are connected to a coordinate signal.
The potential is dynamically made to follow a dynamic reference potential including a component, and the pressing is performed based on a current flowing through the sensor conductor.
A signal processing unit for calculating a cum coordinates, wherein for the shield conductor to a voltage drive, the comprising at least a <br/> press detection signal generator for voltage superimposed on a dynamic reference potential, the coordinate detection
The shield conductor is connected to the dynamic reference potential.
Position tracking or the pressure detection signal generator
The frequency is set to a frequency different from the coordinate signal component, and
The coordinates are calculated by the signal processing unit, and
The dynamic reference potential is held at a static constant potential,
Directly or between the shield conductor and the pressure detection signal generator
Or the dynamic reference potential is dynamic.
As it is, the frequency of the pressure detection signal generator for the coordinates
Set to a frequency different from the signal component,
Wherein according to the change in capacitance between the sensor conductor and the shield conductor, the said pressed from the current change of the pressing detection signal
A pressure detection / capacitance coordinate detection device, which is calculated by a signal processing unit .
ルの面上に於ける押圧兼座標を検出する装置であって、
前記指又は導電スタイラスとの間で静電容量結合を介し
て電気信号を伝達するセンサー導体と該センサー導体と
平行に配設された枠状導体とを機構上一体化した前記セ
ンサーパネルと、前記センサー導体を、座標用信号成分
を含む動的基準電位に対して動的に電位追従させると共
に、前記センサー導体に流れる電流に基づき前記押圧兼
座標を算出する信号処理部と、前記枠状導体を電圧駆動
するための、前記動的基準電位に電圧重畳する押圧検出
用信号発生器とを少なくとも具備し、座標検出に関して
は、前記枠状導体を前記動的基準電位に電位追従させる
か、あるいは前記押圧検出用信号発生器の周波数を前記
座標用信号成分と異なる周波数にして、前記座標を前記
信号処理部が算出し、また、押圧検出に関しては、前記
動的基準電位を静的な定電位に保持し前記シ ールド導体
を前記押圧検出用信号発生器で直接又は間接的に駆動す
るか、あるいは前記動的基準電位は動的のままで前記押
圧検出用信号発生器の周波数を前記座標用信号成分と異
なる周波数にして、前記押圧により発生した前記センサ
ー導体と前記枠状導体間の容量変化に従った、押圧検出
用信号の電流変化から前記押圧を前記信号処理部が算出
することを特徴とする押圧検出兼用静電容量式座標検出
装置。2. A device for detecting the pressing and coordinates of a finger or a conductive stylus on a surface of a sensor panel,
And the sensor panel integrated on mechanisms the sensor conductor and the sensor conductor and disposed parallel to and a frame-shaped conductor for transmitting electrical signals through the capacitive coupling between the finger or conductive stylus, said Connect the sensor conductor to the coordinate signal component
Dynamically causes a potential follow the dynamic reference potential; and a signal processing unit for calculating the pressing cum <br/> coordinates based on the current flowing through the sensor conductor, for a voltage driving the frame-shaped conductor A signal generator for pressure detection that superimposes a voltage on the dynamic reference potential ,
Makes the frame-shaped conductor follow the dynamic reference potential.
Or, or the frequency of the pressure detection signal generator
The frequency is different from the signal component for coordinates, and the coordinates are
The signal processing unit calculates, and regarding the detection of the pressing,
Holding the dynamic reference potential into a static constant potential the sheet Rudo conductor
Is directly or indirectly driven by the pressure detection signal generator.
Or the dynamic reference potential remains dynamic
The frequency of the pressure detection signal generator is different from the coordinate signal component.
A certain frequency, according to a capacitance change between the sensor conductor and the frame-shaped conductor generated by the pressing, the signal processing unit calculates the pressing from a current change of a signal for detecting pressing. Characteristic feature is a capacitance detection device that also serves as a pressure detector.
用信号とは位相が反転した電流を、前記センサー導体に
加えることにより、前記押圧検出用信号の前記信号処理
部に流入する定常電流成分を略キャンセルすることを特
徴とする請求項１記載の押圧検出兼用静電容量式座標検
出装置。3. A steady-state current component flowing into the signal processing unit of the pressure detection signal by applying a current having a phase inverted from that of the pressure detection signal flowing through the sensor conductor to the sensor conductor. 2. The capacitance detecting device according to claim 1, wherein the canceling is performed.
用信号とは位相が反転した電流を、前記センサー導体に
加えることにより、前記押圧検出用信号の前記信号処理
部に流入する定常電流成分を略キャンセルすることを特
徴とする請求項２記載の押圧検出兼用静電容量式座標検
出装置。4. A steady-state current component flowing into the signal processing section of the pressure detection signal by applying a current having a phase inverted to that of the pressure detection signal flowing through the sensor conductor to the sensor conductor. 3. The capacitance detection device according to claim 2, wherein the capacitance is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22999398A JP3277896B2 (en) | 1998-07-31 | 1998-07-31 | Capacitance coordinate detection device that also serves as pressure detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22999398A JP3277896B2 (en) | 1998-07-31 | 1998-07-31 | Capacitance coordinate detection device that also serves as pressure detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000047808A JP2000047808A (en) | 2000-02-18 |
| JP3277896B2 true JP3277896B2 (en) | 2002-04-22 |
Family
ID=16900933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22999398A Expired - Fee Related JP3277896B2 (en) | 1998-07-31 | 1998-07-31 | Capacitance coordinate detection device that also serves as pressure detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3277896B2 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4511064B2 (en) * | 2001-03-05 | 2010-07-28 | 三菱電機株式会社 | Concavity and convexity detection sensor |
| JP4224715B2 (en) | 2005-03-23 | 2009-02-18 | ソニー株式会社 | Coordinate input device and display device |
| JP2006293482A (en) * | 2005-04-06 | 2006-10-26 | Sony Corp | Coordinate input device and coordinate detecting device |
| JP4720568B2 (en) * | 2006-03-24 | 2011-07-13 | ソニー株式会社 | User input device and user input method |
| JP2009098834A (en) * | 2007-10-16 | 2009-05-07 | Epson Imaging Devices Corp | Capacitance type input device, display device with input function and electronic equipment |
| JP2010015412A (en) * | 2008-07-04 | 2010-01-21 | Hitachi Displays Ltd | Display device equipped with touch panel |
| JP5123774B2 (en) | 2008-07-25 | 2013-01-23 | 株式会社ジャパンディスプレイイースト | Input device and display device including the same |
| JP5491020B2 (en) * | 2008-11-26 | 2014-05-14 | 株式会社ジャパンディスプレイ | Touch panel |
| JP5493739B2 (en) | 2009-03-19 | 2014-05-14 | ソニー株式会社 | Sensor device and information processing device |
| JP5854991B2 (en) * | 2009-06-24 | 2016-02-09 | マイクロチップ テクノロジー ジャーマニー ゲーエムベーハー | Display device electrode layout |
| JP5526761B2 (en) * | 2009-12-22 | 2014-06-18 | ソニー株式会社 | Sensor device and information processing device |
| JP5520633B2 (en) * | 2010-02-25 | 2014-06-11 | 株式会社ジャパンディスプレイ | Display device with touch panel |
| WO2011125725A1 (en) * | 2010-03-31 | 2011-10-13 | 東海ゴム工業株式会社 | Capacitance-type sensor device and capacitance-type sensor capacitance measuring device |
| CN102880327B (en) * | 2011-07-12 | 2016-03-30 | 宸鸿光电科技股份有限公司 | Touch-screen touch-control circuit and touch point detection method |
| JP5759658B2 (en) * | 2012-10-28 | 2015-08-05 | レノボ・シンガポール・プライベート・リミテッド | Input system and method of operating electronic device |
| JP6079372B2 (en) * | 2013-03-28 | 2017-02-15 | 富士通株式会社 | DETECTING DEVICE, DETECTING METHOD, AND ELECTRONIC DEVICE |
| KR102245943B1 (en) | 2014-06-23 | 2021-04-29 | 엘지디스플레이 주식회사 | Touch panel and apparatus for driving thereof |
| JP6532105B2 (en) * | 2015-12-17 | 2019-06-19 | 株式会社ワコム | Touch panel, signal processing apparatus and ground coupling method |
| KR101835009B1 (en) | 2016-08-19 | 2018-03-07 | 주식회사 하이딥 | Touch input device |
| JP2019215772A (en) * | 2018-06-14 | 2019-12-19 | 東洋アルミニウム株式会社 | Position detection system |
-
1998
- 1998-07-31 JP JP22999398A patent/JP3277896B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000047808A (en) | 2000-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3277896B2 (en) | Capacitance coordinate detection device that also serves as pressure detection | |
| US10156949B2 (en) | Force-touch sensor with multilayered electrodes | |
| US8148652B2 (en) | Position detecting device and position detecting method | |
| EP0640936B1 (en) | Data processing device comprising a touch screen and a force sensor | |
| US10209805B2 (en) | Integral sensing apparatus for touch and force sensing and method for the same | |
| US8711129B2 (en) | Minimizing mismatch during compensation | |
| US8698769B2 (en) | Dual mode capacitive touch panel | |
| US9965108B2 (en) | Simultaneous self- and mutual capacitance sensing | |
| JP5542155B2 (en) | Touch screen controller | |
| CN102792251B (en) | Five wire resistive touch screen pressure measurement circuitry and methods | |
| IL117510A (en) | Tactile designation device with high-resolution transparent capacitive surface | |
| JP2012043275A (en) | Capacitance type input device | |
| JPH1097382A (en) | Terminal device with touch screen, and touch screen | |
| JP5426429B2 (en) | Input device and display device including the same | |
| TWM522414U (en) | High-precision force-touch sensor with multilayered electrodes | |
| US10180751B2 (en) | Sensing device for force and tactile-proximity sensing | |
| WO2022070752A1 (en) | Electrostatic input device | |
| JP4178690B2 (en) | Parasitic signal elimination touch panel device | |
| JP5919767B2 (en) | Capacitive coupling type electrostatic sensor | |
| US6151013A (en) | Electrical probe-position sensor | |
| KR20210002013A (en) | Touch surface with hybrid touch detection | |
| US20170344169A1 (en) | Integral apparatus for sensing touch and force | |
| JPS6074014A (en) | Driving device of coordinate detection panel | |
| TWM537257U (en) | Integral sensing apparatus for touch and force sensing | |
| US10289241B2 (en) | Sensing apparatus for touch and force sensing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080215 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090215 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090215 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100215 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100215 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110215 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110215 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120215 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120215 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130215 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130215 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140215 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |