JPS62214426A - Panel coordinate position detector - Google Patents
Panel coordinate position detectorInfo
- Publication number
- JPS62214426A JPS62214426A JP61056876A JP5687686A JPS62214426A JP S62214426 A JPS62214426 A JP S62214426A JP 61056876 A JP61056876 A JP 61056876A JP 5687686 A JP5687686 A JP 5687686A JP S62214426 A JPS62214426 A JP S62214426A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- capacitance
- coordinate position
- change
- capacity
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 2
- 101100168355 Arabidopsis thaliana CYP19-1 gene Proteins 0.000 description 1
- 241000785736 Pholis crassispina Species 0.000 description 1
- 101150019434 ROC3 gene Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概 要〕
座標入力パネルにおける浮遊容量を、座標入力パネルに
印加される静電容量の時間変化を算出し、この時間変化
の大きさに基いて検出する。[Detailed Description of the Invention] [Summary] Stray capacitance in a coordinate input panel is detected by calculating a temporal change in capacitance applied to the coordinate input panel, and based on the magnitude of this temporal change.
本発明は、タッチセンサ等と称されるＣＲＴディスプレ
ー等の前面に取りつけられた座標入力パネルの指定位置
を検出する座標位置検出装置に関するものであり、より
特定的には、座標入力パネルの浮遊容量を検出する装置
に関する。The present invention relates to a coordinate position detection device that detects a specified position of a coordinate input panel attached to the front surface of a CRT display, etc., called a touch sensor, and more specifically, the present invention relates to a coordinate position detection device that detects a specified position of a coordinate input panel attached to the front surface of a CRT display, etc. The present invention relates to a device for detecting.
座標位置検出装置は、すでに種々知られており、ＣＲＴ
ディスプレーへの座標位置指定等に、ライトペンに代わ
る簡易な手段として適用されている。Various coordinate position detection devices are already known, such as CRT
It is used as a simple alternative to a light pen for specifying coordinate positions on a display.
すなわち、ＣＲＴディスプレーの前面に取り付けられた
平板状透明電極シートより成る座標人カバネルに指で接
触することにより、遇明電極シートが人体容量を介して
接地される。指が触れた部分を中心として透明電極シー
トの抵抗比を算出すると、指の触れた部分の位２．＞＜
検出される訳である。That is, by touching with a finger a coordinate cable made of a flat transparent electrode sheet attached to the front surface of a CRT display, the electrode sheet is grounded through human body capacitance. Calculating the resistance ratio of the transparent electrode sheet centering around the part touched by the finger, the resistance ratio of the part touched by the finger is 2. ＞＜
That is why it is detected.
座標入力パネルに接触される人体容量はほぼ６０〜１５
０ｐＦである。しかしながら、座標入力パネルには、種
々の浮遊容量が付加されていることが知られている。そ
の１つは、第２図、曲線Ｃｖ３に図示の如く、温度、湿
度等座標人カバネルの環境条件の変化により、例えば１
時間当り１〜２ｐＦ程度で変化していくものがある。他
のものとしては、第２図曲線Ｃ■２に図示の如く電源電
圧の変動によるものがある。電源電圧の短時間の変動、
例えばＬｍｓ程度で数％程度の電源電圧の変動によって
数ｐＦ程度急激に変化する。この変化は主として座標入
力パネルの両端部に接続されたアナログスイッチ等によ
るものと考えられている。The human body capacity that touches the coordinate input panel is approximately 60 to 15
It is 0 pF. However, it is known that various stray capacitances are added to the coordinate input panel. One of them is, as shown in curve Cv3 in Fig. 2, due to changes in the environmental conditions of the coordinate system such as temperature and humidity, for example, 1
Some things change at a rate of about 1 to 2 pF per hour. Another reason is due to fluctuations in the power supply voltage, as shown in curve C2 in FIG. short-term fluctuations in the supply voltage,
For example, it changes rapidly by about several pF due to a change in the power supply voltage of about several percent in about Lms. This change is thought to be mainly due to analog switches connected to both ends of the coordinate input panel.
以上の如き浮遊容量は、座標位置検出の誤差となるので
、パネル座標位置検出装置においては、浮遊容量を検出
し、座標位置検出時浮遊容量の影響を除去することが望
まれている。Since the above stray capacitance causes an error in coordinate position detection, it is desired that the panel coordinate position detection device detect the stray capacitance and eliminate the influence of the stray capacitance when detecting the coordinate position.
本発明は上述の浮遊容量を比較的簡易な手段により検出
するものであり、本発明においては、電極膜が設けられ
た座標入力パネル、該座標入力パネルの静電容量を測定
する回路、および、該測定回路からの静電容量測定値を
順次入力し、該静電容量測定値の時間に対する変化を算
出し、該時間変化算出値を基準の変化値を比較し、前記
座標入力パネルの浮遊容量を検出する、浮遊容量検出回
路、を具備するパネル座標位置検出装置が提供される。The present invention detects the above-mentioned stray capacitance by relatively simple means, and the present invention includes a coordinate input panel provided with an electrode film, a circuit for measuring the capacitance of the coordinate input panel, and The capacitance measurement values from the measurement circuit are sequentially input, the change in the capacitance measurement value with respect to time is calculated, the calculated time change value is compared with the change value as a reference, and the stray capacitance of the coordinate input panel is calculated. A panel coordinate position detection device is provided that includes a stray capacitance detection circuit that detects.
第２図に図示の曲線ＣＶＩＣＶ３に対する時間変化を第
３図の曲線ＲＯＣｚ、 ＲＯＣ３に示す。一方、正規の
指タッチにより検出される静電容量は第２図曲線ＣＶ、
の如く図示される。指が座標入力パネルに近づくにつれ
て静電容量が現われ、時間１．、例えば５０ｍ５におけ
る静電容量は数ｐＦ、その直後指が座標入力パネルに触
れることで、６０〜１５０ｐＦ程度に急激に大きくなる
。この変化を表わすと第３図の曲線ＲＯＣ，となる。Changes over time with respect to the curve CVICV3 shown in FIG. 2 are shown in curves ROCz and ROC3 in FIG. 3. On the other hand, the capacitance detected by regular finger touch is the curve CV in Figure 2,
It is illustrated as follows. As the finger approaches the coordinate input panel, capacitance appears, and time 1. For example, the capacitance at 50 m5 is several pF, and immediately after that, when a finger touches the coordinate input panel, it suddenly increases to about 60 to 150 pF. This change is represented by the curve ROC in FIG.
以上から、静電容量の時間変化を算出し、曲線ＲＯＣｌ
に相当するもの以外を浮遊容量として検出する。From the above, the time change in capacitance is calculated, and the curve ROCl
Capacitance other than that corresponding to is detected as stray capacitance.
第１図に本発明の一実施例にもとづく座標位置検出装置
の浮遊容量検出装置の回路図を示す。FIG. 1 shows a circuit diagram of a stray capacitance detection device of a coordinate position detection device based on an embodiment of the present invention.
符号１は入力パネル、２は静電容量測定回路、３は浮遊
容量検出回路３を示す。浮遊容量検出回路３は、静電容
量測定回路２からの静電容量測定値を入力する入力回路
３１、静電容量測定値を保存するメモリ３２を有してい
る。また、浮遊容量検出回路３は、一定時間τに対する
前回の静電容量測定値ｘ、−１と今回の静電容量測定値
Ｘｉとの差、すなわち変化率を計算する変化率計算回路
３３、該計算変化率と予めメモリ３４に記録された基準
の変化率とを比較する比較回路３５とを有している。Reference numeral 1 indicates an input panel, 2 indicates a capacitance measuring circuit, and 3 indicates a stray capacitance detection circuit 3. The stray capacitance detection circuit 3 has an input circuit 31 that inputs the capacitance measurement value from the capacitance measurement circuit 2, and a memory 32 that stores the capacitance measurement value. The stray capacitance detection circuit 3 also includes a change rate calculation circuit 33 that calculates the difference between the previous capacitance measurement value x, -1 and the current capacitance measurement value Xi for a certain period of time τ, that is, the rate of change; It has a comparison circuit 35 that compares the calculated rate of change with a reference rate of change recorded in the memory 34 in advance.
座標位置検出装置の検出回路（図示せず）が浮遊容量検
出回路に接続され、浮遊容量であることを示す信号Ｓ３
および浮遊容量値Ｓｘを入力し、座標位置検出時の補正
に用いる。A detection circuit (not shown) of the coordinate position detection device is connected to a stray capacitance detection circuit, and a signal S3 indicating that there is a stray capacitance is generated.
and the stray capacitance value Sx are input and used for correction during coordinate position detection.
第１図装置の動作について詳述する。The operation of the device shown in FIG. 1 will be described in detail.
入力パネル１において発生し、測定回路２を介して測定
される静電容量は第２図に図示の如く変化する。この静
電容量の時間変化を浮遊容量検出回路３内の変化率計算
回路３３で計算すると第３図に図示の如くなる。前述の
如く、環境変化により生ずる浮遊容量の変化は曲線ＲＯ
Ｃ！の如く、小さい値である。一方電源変動に伴う浮遊
容量の変化は、急激に変化するので、変化時は大きいが
、通常の電源安定時はほぼ零である。これに対し、正規
の指接触によるものは、５０−３間程度は微増するので
ある程度の変化率を示し、その後、急激に大暴＜なった
後、指が完全に接触した時点で変化率はほぼ零となる。The capacitance generated in the input panel 1 and measured via the measuring circuit 2 changes as shown in FIG. When the change in capacitance over time is calculated by the change rate calculation circuit 33 in the stray capacitance detection circuit 3, the result is as shown in FIG. As mentioned above, the change in stray capacitance caused by environmental changes is expressed by the curve RO
C! , it is a small value. On the other hand, the change in stray capacitance due to power supply fluctuations changes rapidly, so it is large when it changes, but it is almost zero when the power supply is stable. On the other hand, in the case of regular finger contact, there is a slight increase between 50 and 3, so it shows a certain rate of change, and after that, it suddenly becomes violent, and when the finger makes complete contact, the rate of change decreases. It becomes almost zero.
指が離れる場合は、この逆の特性を示す。従って、メモ
リ３４には、指が接触する場合の基準パターンにもとづ
いた、成る程度の余裕を見込んだデータを記憶しておき
、この基準データから外れた場合を比較器３５を介して
浮遊容量として信号Ｓ３を出力する。When the fingers are separated, the opposite characteristics are exhibited. Therefore, the memory 34 stores data based on the reference pattern when the finger touches, allowing for a certain amount of margin, and when the data deviates from the reference data, it is detected as a stray capacitance via the comparator 35. Outputs signal S3.
以上の実施例において、入力回路３１の入力りイミノジ
と変化率計算回路３３の一定時間τを、同じ値、例えば
０．５ｍｓとしておけば、変化率計算回路３３は、単に
差分”” Ｘ ｉ Ｘ ｉ −１を計算する回路で
よい。In the above embodiment, if the input current of the input circuit 31 and the constant time τ of the rate of change calculation circuit 33 are set to the same value, for example, 0.5 ms, the rate of change calculation circuit 33 simply calculates the difference "" X i A circuit that calculates i −1 may be used.
浮遊容量検出回路３は、ディジタル形式、アナログ形式
のいずれであってもよい。ディジタル形式の場合、入力
回路３１にＡＤ変換器が含まれ、メモリ３２．３４レジ
スタ又はディジタルメモリとなる。変化率計算回路３３
および比較回路３５はレジスタ等で実現することができ
る。アナログ形式の場合、メモリ３２はアナログメモリ
、メモ！Ｊ３４は関数発生器により実現することができ
る。The stray capacitance detection circuit 3 may be of either a digital format or an analog format. In the case of digital format, the input circuit 31 includes an AD converter and the memory 32.34 is a register or digital memory. Change rate calculation circuit 33
The comparator circuit 35 can be realized using a register or the like. In the case of analog format, the memory 32 is an analog memory, Memo! J34 can be implemented by a function generator.
以上の実施例において環境変化に基づく浮遊容量のみを
検出する場合は、変化率検出のための同期を非常に大き
くし、例えば数秒程度とし、比較器３５への基準値を一
定値にすればよく、非常に間車な構成となる。この場合
、対ノイズ性を考慮して、複数のデータ列に対する変化
率を計算することができる。In the above embodiment, when detecting only stray capacitance due to environmental changes, it is sufficient to make the synchronization for detecting the rate of change very large, for example, several seconds, and to set the reference value to the comparator 35 to a constant value. , resulting in a very sparse configuration. In this case, it is possible to calculate the rate of change for a plurality of data strings, taking noise resistance into consideration.
曲線ＲＯＣ＋とＲＯＣｚの識別がやや複雑であるが、一
旦大きな変化が検出された後、この時の値を保存してお
き、１００ｍ５程度経過後、変化が小さい場合は、電源
電圧変動にするものとし、Ｌｏｏｍｓ程度経過後、以前
に保存した値を出力することにより、基準パターン用メ
モリ３４を削除することができる。ＩＱＯｍｓ程度の補
正おくれは問題とはならず、電源も常時変動するもので
はない。Distinguishing the curves ROC+ and ROCz is a little complicated, but once a large change is detected, save the value at that time, and if the change is small after about 100m5, change the power supply voltage. , Looms, the reference pattern memory 34 can be deleted by outputting the previously saved value. A correction delay of about IQOms is not a problem, and the power supply does not constantly fluctuate.
以上に述べたように本発明によれば比較的簡単な手段に
より浮遊容量を積出す・ることができる。As described above, according to the present invention, stray capacitance can be discharged by relatively simple means.
第１図は本発明の一実施例としての浮遊容量検出装置の
回路図、
第２図は第１図における人カバネルの静電容量変化特性
図、
第３図は第２図特性の時間変化図、である。
（符号の説明）
１・・・入力パネル、 ２・・・静電容ｆｆｉ測定回
路、３・・・浮遊容量検出回路。
本発明の実施例の座標位置検出装
置の浮遊容量検出装置回路図
１ °°大入力９ネル
２ ・°静電容量測定回路
３・・・浮遊容量検出回路
３４− ＝−入力回路
３２．３４・・ メモリ
３３ ・・変化率計算回路
３５・・・比較回路
、１−■
第１図入力・ぐネルにおける容量変化特性図第２図
第２図特性の時間変化図
築３図Fig. 1 is a circuit diagram of a stray capacitance detection device as an embodiment of the present invention, Fig. 2 is a capacitance change characteristic diagram of the human cabanel in Fig. 1, and Fig. 3 is a time change diagram of the characteristic shown in Fig. 2. , is. (Explanation of symbols) 1... Input panel, 2... Capacitance ffi measurement circuit, 3... Stray capacitance detection circuit. Stray capacitance detection device circuit diagram of the coordinate position detection device according to the embodiment of the present invention 1 °° large input 9 channels 2 · ° capacitance measurement circuit 3... Stray capacitance detection circuit 34- = - input circuit 32.34.・Memory 33... Rate of change calculation circuit 35... Comparison circuit, 1-■ Fig. 1 Capacitance change characteristic diagram at input/gunnel Fig. 2 Fig. 2 Time change characteristic diagram Fig. 3
Claims (1)
容量測定値の時間に対する変化を算出し、該時間変化算
出値を基準の変化値を比較し、前記座標入力パネルの浮
遊容量を検出する、浮遊容量検出回路、 を具備するパネル座標位置検出装置。[Claims] 1. A coordinate input panel provided with an electrode film, a circuit for measuring the capacitance of the coordinate input panel, and capacitance measurement values from the measurement circuit are sequentially input, and the capacitance is A panel coordinate position detection device comprising: a stray capacitance detection circuit that calculates a change in a measured capacitance value over time, compares the calculated time change value with a reference change value, and detects stray capacitance of the coordinate input panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61056876A JPS62214426A (en) | 1986-03-17 | 1986-03-17 | Panel coordinate position detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61056876A JPS62214426A (en) | 1986-03-17 | 1986-03-17 | Panel coordinate position detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62214426A true JPS62214426A (en) | 1987-09-21 |
Family
ID=13039620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61056876A Pending JPS62214426A (en) | 1986-03-17 | 1986-03-17 | Panel coordinate position detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62214426A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6667117B2 (en) | 2000-04-06 | 2003-12-23 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a manufacturing method for the same |
| JP2008198211A (en) * | 2007-02-13 | 2008-08-28 | Samsung Electronics Co Ltd | Display device and its driving method |
-
1986
- 1986-03-17 JP JP61056876A patent/JPS62214426A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6667117B2 (en) | 2000-04-06 | 2003-12-23 | Fuji Electric Co., Ltd. | Perpendicular magnetic recording medium and a manufacturing method for the same |
| JP2008198211A (en) * | 2007-02-13 | 2008-08-28 | Samsung Electronics Co Ltd | Display device and its driving method |
| US8730198B2 (en) | 2007-02-13 | 2014-05-20 | Samsung Display Co., Ltd. | Display device and driving method thereof |
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