TW201337659A - Passive touch pen with constant power source - Google Patents
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- TW201337659A TW201337659A TW101108879A TW101108879A TW201337659A TW 201337659 A TW201337659 A TW 201337659A TW 101108879 A TW101108879 A TW 101108879A TW 101108879 A TW101108879 A TW 101108879A TW 201337659 A TW201337659 A TW 201337659A
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Description
本發明是有關於一種電磁式觸控筆，特別是指一種具有恆定電源的被動型觸控筆。The invention relates to an electromagnetic stylus, in particular to a passive stylus with a constant power supply.
已知電磁式的觸控筆技術具有兩種，分別是主動型及被動型；其中，主動型觸控筆需安裝電池，因此筆的重量較重及體積較大，而被動型觸控筆不需安裝電池，因此比主動型觸控筆較輕巧，在使用上具有優勢。Electromagnetic stylus technology is known to have two types, active and passive. Among them, the active stylus needs to be equipped with a battery, so the weight of the pen is heavier and larger, while the passive stylus does not. The battery needs to be installed, so it is lighter than the active stylus and has advantages in use.
參閱圖1，已知的一種被動型的觸控筆91是配合一具有發射/接收功能的數位板92使用，觸控筆91包括一接收電路911、一轉換電路912及一發射電路913。Referring to FIG. 1, a passive type stylus 91 is used in conjunction with a tablet 92 having a transmitting/receiving function. The stylus 91 includes a receiving circuit 911, a converting circuit 912, and a transmitting circuit 913.
接收電路911是感測數位板92發射的一交流信號並儲存感應信號，轉換電路912將感應信號半波整流及濾波轉換為一工作電壓，發射電路913再利用該工作電壓轉換為一預定頻率的振盪信號給數位板92；然後，數位板92利用本身的天線迴路921可感測觸控筆91發出的載波信號，控制器923配合多工器922依據取得的感測信號強弱轉換為對應數位板92上的座標位置。然而，接收電路911會因為觸控筆91與數位板92的距離長短而造成儲存電能強弱的差異，進而導致轉換電路912的整流濾波後的電壓不一致，甚至忽高忽低。The receiving circuit 911 senses an AC signal emitted by the tablet 92 and stores the sensing signal. The converting circuit 912 converts the half-wave rectification and filtering of the sensing signal into an operating voltage, and the transmitting circuit 913 converts the working voltage into a predetermined frequency. The oscillating signal is sent to the tablet 92; then, the tablet 92 can sense the carrier signal sent by the stylus 91 by using the antenna circuit 921, and the controller 923 cooperates with the multiplexer 922 to convert the corresponding signal to the corresponding tablet according to the obtained sensing signal strength. The coordinate position on 92. However, the receiving circuit 911 may cause a difference in stored power intensity due to the distance between the stylus pen 91 and the tablet 92, thereby causing the rectified and filtered voltage of the converting circuit 912 to be inconsistent or even high or low.
參閱圖1及圖2，觸控筆91於第一時間T1時與數位板92的距離較近，接收電路911的感應信號、轉換電路912的半波整流信號及濾波信號(即工作電壓)，及發射電路913的振盪信號的振幅較大；然而，觸控筆91於第二時間T2時與數位板92的距離較遠，使得觸控筆91的感應信號降低，半波整流信號、濾波信號及振盪信號的電壓振幅也隨著變小，如此會導致數位板92接收的載波信號強度強弱不同或有抖動的現象，進而使得數位板92轉換座標位置時造成誤差。Referring to FIG. 1 and FIG. 2, the stylus 91 is closer to the tablet 92 at the first time T1, and receives the sensing signal of the circuit 911, the half-wave rectified signal of the conversion circuit 912, and the filtered signal (ie, the operating voltage). The amplitude of the oscillating signal of the transmitting circuit 913 is large; however, the stylus 91 is far away from the tablet 92 at the second time T2, so that the sensing signal of the stylus 91 is lowered, the half-wave rectified signal and the filtered signal are The voltage amplitude of the oscillating signal also becomes smaller, which may cause the intensity of the carrier signal received by the tablet 92 to be different or jittery, thereby causing an error when the tablet 92 converts the coordinate position.
本發明之目的，即在提供一種具有恆定電源的被動型觸控筆。It is an object of the present invention to provide a passive stylus with a constant power source.
本發明的被動型觸控筆是配合一數位板使用，該數位板產生的電磁波提供一交流信號的能量，該觸控筆包含一感應該能量的第一線圈、一將該第一線圈能量儲存為電能的充電電路、一將電能轉換為一頻率不與該交流信號頻率彼此干擾的載波信號的諧振電路，及一將該載波信號發送予該數位板的第二線圈。The passive stylus of the present invention is used in conjunction with a digital tablet, and the electromagnetic wave generated by the digital tablet provides energy of an alternating signal, the stylus includes a first coil for sensing the energy, and the first coil is stored for energy. A charging circuit for electric energy, a resonant circuit that converts electrical energy into a carrier signal whose frequency does not interfere with the frequency of the alternating signal, and a second coil that transmits the carrier signal to the tablet.
本發明的技術特點在於：該觸控筆還包括一整流電路、一濾波電容及一穩壓電路；該整流電路將該交流信號全波整流為一倍頻信號；該濾波電容將該倍頻信號濾波為一直流信號；該穩壓電路將該直流信號處理為一恆定的穩壓信號，藉由供應恆定的穩壓信號予該諧振電路產生恆定的載波信號給該第二線圈，且該恆定的穩壓信號的振幅低於該直流信號的振幅，可避免因為該交流信號抖動而影響供給該數位板的載波信號的穩定性。The technical feature of the present invention is that the stylus further includes a rectifying circuit, a filter capacitor and a voltage stabilizing circuit; the rectifying circuit rectifies the AC signal into a multi-frequency signal; the filter capacitor multiplies the multiplying signal Filtering is a DC signal; the voltage stabilization circuit processes the DC signal into a constant voltage regulation signal, and supplies a constant voltage regulation signal to the resonance circuit to generate a constant carrier signal to the second coil, and the constant The amplitude of the regulated signal is lower than the amplitude of the DC signal to avoid the stability of the carrier signal supplied to the tablet due to the jitter of the AC signal.
該穩壓電路包括一電阻、一穩壓元件及一輸出電容：該電阻的一端與該濾波電容電性連接，該電阻的另一端與該穩壓元件及該諧振電路電性連接；該穩壓元件與該電阻串聯，且對供給該諧振電路的該直流信號進行限壓；該輸出電容並聯於該穩壓元件及該諧振電路之間。The voltage stabilizing circuit includes a resistor, a voltage stabilizing component and an output capacitor: one end of the resistor is electrically connected to the filter capacitor, and the other end of the resistor is electrically connected to the voltage stabilizing component and the resonant circuit; The component is connected in series with the resistor, and the DC signal supplied to the resonant circuit is limited in voltage; the output capacitor is connected in parallel between the voltage stabilizing component and the resonant circuit.
該穩壓元件的型式可以是一限壓控制器、多數個彼此串聯以利用其順向偏壓進行限壓的二極體，或是一利用逆向崩潰電壓進行限壓的齊納二極體。The type of the voltage stabilizing element may be a voltage limiting controller, a plurality of diodes connected in series to each other for limiting the voltage with a forward bias voltage, or a Zener diode for limiting the voltage by a reverse breakdown voltage.
本發明的具有恆定電源的被動型觸控筆之功效在於：穩壓電路將該直流信號處理為一恆定的穩壓信號，藉由供應恆定的穩壓信號予該諧振電路產生恆定的載波信號給該第二線圈，可避免因為該交流信號抖動而影響供給該數位板的載波信號的穩定性。The utility model of the passive stylus with constant power supply of the invention has the effect that the voltage stabilizing circuit processes the direct current signal into a constant voltage stabilizing signal, and supplies a constant voltage stabilizing signal to the resonant circuit to generate a constant carrier signal. The second coil can avoid the stability of the carrier signal supplied to the tablet due to the jitter of the AC signal.
有關本發明之前述及其他技術內容、特點與功效，在以下配合參考圖式之較佳實施例的詳細說明中，將可清楚的呈現。The foregoing and other objects, features, and advantages of the invention are set forth in the <RTIgt;
參閱圖3，本發明有之較佳實施例中，一電磁式輸入系統100包括一觸控筆1及一數位板3，在此電磁式輸入系統100中，觸控筆1是配合在數位板3上書寫，數位板3可偵知及換算觸控筆1在數位板3上的座標位置並輸出供外部裝置(如：電腦主機)應用。Referring to FIG. 3, in an embodiment of the present invention, an electromagnetic input system 100 includes a stylus pen 1 and a digit board 3. In the electromagnetic input system 100, the stylus pen 1 is matched with the tablet. 3 writing, the tablet 3 can detect and convert the coordinate position of the stylus 1 on the tablet 3 and output for external device (such as: computer host) application.
數位板3具有一控制單元30、一內部線圈311、一配置於內部線圈311外側的外部線圈312、一發射處理電路322及一接收處理電路321；其元件運作原理介紹如下：控制單元30控制發射處理電路322配合外部線圈312將一交流信號的能量給觸控筆1，此外，控制單元30並控制內部線圈311配合接收處理電路321取得觸控筆1發出的電磁信號以進行座標位置的換算，由於如何計算座標並非本發明重點，在此不詳細說明。The tablet 3 has a control unit 30, an internal coil 311, an external coil 312 disposed outside the internal coil 311, a transmitting processing circuit 322, and a receiving processing circuit 321; the operating principle of the components is as follows: The control unit 30 controls the transmitting The processing circuit 322 cooperates with the external coil 312 to supply the energy of an AC signal to the stylus pen 1. Further, the control unit 30 controls the internal coil 311 to cooperate with the receiving processing circuit 321 to obtain the electromagnetic signal emitted by the stylus pen 1 for coordinate conversion. Since the calculation of the coordinates is not the focus of the present invention, it will not be described in detail herein.
觸控筆1包含一第一線圈101、一充電電路11、一整流電路12、一穩壓電路13、一諧振電路14及一第二線圈102。其中，第一線圈101用於感應數位板3的外部線圈312發出的交流信號的電磁波能量，充電電路11將數位板3的電磁波能量儲存為電能，諧振電路14將電能轉換為一頻率不與該交流信號頻率彼此干擾的載波信號，然後，第二線圈102將第二頻率的載波信號發送予數位板3，第一頻率及第二頻率兩者可設計為差距極大(例如：第一頻率為第二頻率的10倍以上)的頻帶範圍，因此，兩者可彼此不受干擾及影響。The stylus 1 includes a first coil 101, a charging circuit 11, a rectifying circuit 12, a voltage stabilizing circuit 13, a resonant circuit 14, and a second coil 102. The first coil 101 is used to sense the electromagnetic wave energy of the alternating current signal emitted by the outer coil 312 of the digital board 3. The charging circuit 11 stores the electromagnetic wave energy of the digital board 3 as electric energy, and the resonant circuit 14 converts the electric energy into a frequency. The carrier signal of the AC signal frequency interferes with each other, and then the second coil 102 transmits the carrier signal of the second frequency to the tablet 3, and the first frequency and the second frequency can be designed to be extremely different (for example, the first frequency is the first The frequency band range of 10 times or more of the two frequencies, therefore, the two can be mutually undisturbed and affected.
參閱圖4，觸控筆1還包括一並聯於整流電路12及穩壓電路13之間的濾波電容C1，整流電路12是四個二極體D1、D2、D3、D4組成的橋式整流電路；穩壓電路13包括一電阻R1、一穩壓元件131及一輸出電容C2，電阻R1用於分壓，輸出電容C2則是用於儲存能量。Referring to FIG. 4, the stylus 1 further includes a filter capacitor C1 connected in parallel between the rectifier circuit 12 and the voltage stabilization circuit 13. The rectifier circuit 12 is a bridge rectifier circuit composed of four diodes D1, D2, D3, and D4. The voltage stabilizing circuit 13 includes a resistor R1, a voltage stabilizing component 131 and an output capacitor C2. The resistor R1 is used for voltage division, and the output capacitor C2 is used for storing energy.
電阻R1的一端與濾波電容C1電性連接，電阻R1的另一端與穩壓元件131及諧振電路14電性連接，穩壓元件131對供給諧振電路14的直流信號進行限壓後，輸出電容C2再儲存能量以供應諧振電路14所需的電能。One end of the resistor R1 is electrically connected to the filter capacitor C1, the other end of the resistor R1 is electrically connected to the voltage stabilizing element 131 and the resonant circuit 14, and the voltage stabilizing element 131 limits the DC signal supplied to the resonant circuit 14 to output a capacitor C2. The energy is again stored to supply the electrical energy required by the resonant circuit 14.
參閱圖4的第一實施例中，穩壓元件131是一低壓差線性穩壓器(Low Dropout Regulator，LDO)。Referring to the first embodiment of FIG. 4, the voltage stabilizing element 131 is a Low Dropout Regulator (LDO).
參閱圖5的第二實施例中，穩壓電路13’的穩壓元件131’是多數個彼此串聯以利用其順向偏壓進行限壓的二極體D5、D6、D7，因此可對直流信號進行限壓。Referring to the second embodiment of FIG. 5, the voltage stabilizing element 131' of the voltage stabilizing circuit 13' is a plurality of diodes D5, D6, and D7 connected in series to each other for limiting the voltage with the forward bias thereof, thereby being capable of DC. The signal is limited in voltage.
參閱圖6的第三實施例中，穩壓電路13”的穩壓元件131”是一利用逆向崩潰電壓進行限壓的齊納二極體Dz，因此也可以對直流信號進行限壓。Referring to the third embodiment of FIG. 6, the voltage stabilizing element 131" of the voltage stabilizing circuit 13" is a Zener diode Dz that is limited by the reverse collapse voltage, so that the DC signal can also be limited.
參閱圖7，配合圖4，本發明的具有恆定電源的被動型觸控筆1的各元件的量測點的波形示意圖及工作原理介紹如下。Referring to FIG. 7, with reference to FIG. 4, the waveform diagram and working principle of the measuring points of the components of the passive stylus 1 with constant power supply of the present invention are described below.
量測點I的交流信號VRX：第一線圈101與數位板3因互感作用而得到交流信號VRX，且其操作頻率為第一頻率。The AC signal V RX of the measurement point I: the first coil 101 and the tablet 3 obtain an AC signal V RX due to the mutual inductance, and the operating frequency is the first frequency.
量測點II的倍頻信號VB：整流電路12將交流信號VRX全波整流為雙倍於第一頻率的倍頻信號VB。Frequency Doubled Signal V B of Measurement Point II: The rectifier circuit 12 rectifies the AC signal V RX into a double frequency signal V B that is twice the first frequency.
量測點III的直流信號Vi：濾波電容C1將倍頻信號VB濾波為一直流信號Vi，由於無法完全穩壓，隨著交流信號VRX的振幅變化，直流信號Vi的振幅也會隨之微幅波動。III DC measurement points V i is: filtering capacitor C1 filters the multiplied signal V B for the DC V i is, since the not fully regulated, as the amplitude change of the AC signal V RX, the DC amplitude V i is also It will fluctuate slightly.
量測點IV的穩壓信號Vo：穩壓電路13將直流信號Vi處理為一恆定的穩壓信號Vo，並供應此恆定的穩壓信號Vo予諧振電路14。The voltage stabilizing signal V o of the measuring point IV: the voltage stabilizing circuit 13 processes the DC signal V i into a constant voltage stabilizing signal V o and supplies the constant voltage stabilizing signal V o to the resonant circuit 14 .
量測點V的載波信號VTX：諧振電路14依據恆定的穩壓信號Vo發送出載波信號VTX給數位板3，且其操作頻率為第二頻率，此第二頻率不與該交流信號VRX的第一頻率彼此干擾。The carrier signal V TX of the measuring point V: the resonant circuit 14 sends the carrier signal V TX to the tablet 3 according to the constant voltage stabilizing signal V o , and its operating frequency is the second frequency, and the second frequency does not match the alternating current signal The first frequencies of V RX interfere with each other.
藉由前述可知，觸控筆1於第一時間TA時與數位板3的距離較近，交流信號VRX、倍頻信號VB、直流信號Vi的電壓振幅較大；然而，觸控筆91於第二時間TB時與數位板92的距離較遠，使得觸控筆91的交流信號VRX、倍頻信號VB、直流信號Vi的電壓振幅也隨著變小，但是因為穩壓電路13將直流信號Vi處理為恆定的穩壓信號Vo，令諧振電路14依據恆定的穩壓信號Vo發送出載波信號VTX給數位板3，有效防止數位板92接收的載波信號強度強弱不同而導致轉換座標位置時造成誤差的問題。As can be seen from the foregoing, the distance between the stylus pen 1 and the tablet 3 at the first time T A is relatively short, and the voltage amplitudes of the AC signal V RX , the multiplied signal V B , and the DC signal V i are large; however, the touch The pen 91 is far away from the tablet 92 at the second time T B , so that the voltage amplitudes of the alternating signal V RX , the multiplied signal V B , and the direct current signal V i of the stylus 91 also become smaller, but because The voltage stabilizing circuit 13 processes the DC signal V i into a constant voltage stabilizing signal V o , and causes the resonant circuit 14 to transmit the carrier signal V TX to the tablet 3 according to the constant voltage stabilizing signal V o , effectively preventing the carrier received by the tablet 92 . The signal strength is different, which causes errors in the conversion of coordinate positions.
需補充說明的是，前述穩壓等效元件的幾個實施例，只要將恆定的穩壓信號Vo設計在不受交流信號VRX抖動而影響供給數位板3的載波信號VTX的電壓振幅的穩定性即可，例如：恆定的穩壓信號Vo的振幅低於該直流信號Vi的振幅，可避免因為該交流信號VRX抖動而影響供給該數位板3的載波信號VTX的穩定性。It is added that required, the regulation of several elements equivalent embodiments, as long as the constant voltage regulator design signal V o V RX signal from the AC voltage amplitude jitter affects the signal V 3 is supplied the carrier of the tablet of TX The stability may be, for example, the amplitude of the constant voltage stabilization signal V o is lower than the amplitude of the DC signal V i , and the stability of the carrier signal V TX supplied to the tablet 3 may be prevented due to the jitter of the AC signal V RX . Sex.
綜上所述，本發明的具有恆定電源的被動型觸控筆1之功效在於：由於穩壓電路13將直流信號Vi處理為恆定的穩壓信號Vo，如此一來，觸控筆1就不會因為交流信號VRX抖動而影響輸出載波信號VTX的穩定性，數位板3也可計算出正確的座標位置，故確實能達成本發明之目的。In conclusion, passive stylus efficacy with a constant power supply 1 of the present invention is that: Since the regulator circuit 13 DC V i is treated as a constant regulated signal V o, this way, the stylus 1 The stability of the output carrier signal V TX is not affected by the AC signal V RX jitter, and the tablet 3 can also calculate the correct coordinate position, so that the object of the present invention can be achieved.
惟以上所述者，僅為本發明之較佳實施例而已，當不能以此限定本發明實施之範圍，即大凡依本發明申請專利範圍及發明說明內容所作之簡單的等效變化與修飾，皆仍屬本發明專利涵蓋之範圍內。The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.
91．．．觸控筆91. . . Stylus
911．．．接收電路911. . . Receiving circuit
912．．．轉換電路912. . . Conversion circuit
913．．．發射電路913. . . Transmitting circuit
92．．．數位板92. . . Digital tablet
921．．．天線迴路921. . . Antenna loop
922．．．多工器922. . . Multiplexer
923．．．控制器923. . . Controller
100．．．電磁式輸入系統100. . . Electromagnetic input system
1．．．觸控筆1. . . Stylus
101．．．第一線圈101. . . First coil
102．．．第二線圈102. . . Second coil
11．．．充電電路11. . . Charging circuit
12．．．整流電路12. . . Rectifier circuit
13、13’、13”．．．穩壓電路13, 13', 13"... voltage regulator circuit
131、131’、131”．．．穩壓元件131, 131', 131"... voltage regulator components
14．．．諧振電路14. . . Resonant circuit
3．．．數位板3. . . Digital tablet
30．．．控制單元30. . . control unit
311．．．內部線圈311. . . Internal coil
312．．．外部線圈312. . . External coil
321．．．接收處理電路321. . . Receiving processing circuit
322．．．發射處理電路322. . . Transmitting processing circuit
C1．．．濾波電容C1. . . Filter capacitor
C2．．．輸出電容C2. . . Output capacitor
D1、D2、D3、D4、D5、D6、D7．．．二極體D1, D2, D3, D4, D5, D6, D7. . . Dipole
Dz．．．齊納二極體Dz. . . Zener diode
R1．．．電阻R1. . . resistance
I~V．．．量測點I~V. . . Measuring point
圖1是一示意圖，說明已知的一種被動型的觸控筆及數位板；1 is a schematic view showing a known passive stylus and a tablet;
圖2是一波形圖，說明圖1的觸控筆的電路元件的動作原理；2 is a waveform diagram illustrating the principle of operation of the circuit components of the stylus of FIG. 1;
圖3是一示意圖，說明本發明的具有恆定電源的被動型觸控筆之較佳實施例中，觸控筆及數位板具有的元件；3 is a schematic view showing the components of the stylus pen and the digital tablet in the preferred embodiment of the passive stylus with constant power supply of the present invention;
圖4是一電路圖，說明本發明的具有恆定電源的被動型觸控筆，其穩壓元件是一低壓差線性穩壓器；4 is a circuit diagram illustrating a passive stylus with a constant power supply of the present invention, the voltage stabilizing element of which is a low dropout linear regulator;
圖5是一電路圖，說明穩壓元件是多數個彼此串聯以利用其順向偏壓進行限壓的二極體；Figure 5 is a circuit diagram showing that the voltage stabilizing element is a plurality of diodes connected in series to each other to limit the voltage with their forward bias;
圖6是一電路圖，說明穩壓元件是一齊納二極體；及Figure 6 is a circuit diagram showing that the voltage stabilizing element is a Zener diode;
圖7是一波形圖，說明本發明的具有恆定電源的被動型觸控筆的各元件的量測點的波形示意圖及工作原理。Fig. 7 is a waveform diagram showing the waveform diagram and the operation principle of the measuring points of the components of the passive stylus with constant power supply according to the present invention.
1．．．觸控筆1. . . Stylus
101．．．第一線圈101. . . First coil
102．．．第二線圈102. . . Second coil
11．．．充電電路11. . . Charging circuit
12．．．整流電路12. . . Rectifier circuit
13．．．穩壓電路13. . . Regulator circuit
131．．．穩壓元件131. . . Voltage regulator component
14．．．諧振電路14. . . Resonant circuit
3．．．數位板3. . . Digital tablet
C1．．．濾波電容C1. . . Filter capacitor
C2．．．輸出電容C2. . . Output capacitor
D1、D2、D3、D4．．．二極體D1, D2, D3, D4. . . Dipole
R1．．．電阻R1. . . resistance
I~V．．．量測點I~V. . . Measuring point
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101108879A TWI537774B (en) | 2012-03-15 | 2012-03-15 | Passive stylus with constant power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101108879A TWI537774B (en) | 2012-03-15 | 2012-03-15 | Passive stylus with constant power supply |
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| Publication Number | Publication Date |
|---|---|
| TW201337659A true TW201337659A (en) | 2013-09-16 |
| TWI537774B TWI537774B (en) | 2016-06-11 |
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| TW101108879A TWI537774B (en) | 2012-03-15 | 2012-03-15 | Passive stylus with constant power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI584183B (en) * | 2014-08-27 | 2017-05-21 | 三星電子股份有限公司 | Touch panel |
| US10379694B2 (en) | 2014-08-27 | 2019-08-13 | Samsung Electronics Co., Ltd. | Touch panel and coordinate measuring system having the same |
| CN110321017A (en) * | 2019-07-29 | 2019-10-11 | 深圳市千分一智能技术有限公司 | A kind of the stamp circuit and code printing method of active capacitance pen |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI709887B (en) * | 2018-10-24 | 2020-11-11 | 義隆電子股份有限公司 | Touch system, its input device and its signal transmission method |
| CN111090344B (en) | 2018-10-24 | 2023-08-18 | 义隆电子股份有限公司 | Touch device with charging function and charging control method thereof |
-
2012
- 2012-03-15 TW TW101108879A patent/TWI537774B/en active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI584183B (en) * | 2014-08-27 | 2017-05-21 | 三星電子股份有限公司 | Touch panel |
| US10379694B2 (en) | 2014-08-27 | 2019-08-13 | Samsung Electronics Co., Ltd. | Touch panel and coordinate measuring system having the same |
| CN110321017A (en) * | 2019-07-29 | 2019-10-11 | 深圳市千分一智能技术有限公司 | A kind of the stamp circuit and code printing method of active capacitance pen |
| CN110321017B (en) * | 2019-07-29 | 2024-02-02 | 深圳市千分一智能技术有限公司 | Coding circuit and coding method of active capacitance pen |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI537774B (en) | 2016-06-11 |
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