CN102193695A - Touch panel test equipment and its detection device - Google Patents
- ️Wed Sep 21 2011
CN102193695A - Touch panel test equipment and its detection device - Google Patents
Touch panel test equipment and its detection device Download PDFInfo
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- CN102193695A CN102193695A CN2010101344056A CN201010134405A CN102193695A CN 102193695 A CN102193695 A CN 102193695A CN 2010101344056 A CN2010101344056 A CN 2010101344056A CN 201010134405 A CN201010134405 A CN 201010134405A CN 102193695 A CN102193695 A CN 102193695A Authority
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Abstract
The invention provides a touch panel test device and a detection device thereof, which are used for testing the function of a touch panel. The test equipment comprises a plurality of sensors, a detection module and a judgment module. The detection module receives and processes the plurality of micro capacitance signals to generate a plurality of output signals, and the detection module comprises a plurality of detection units. Each detection unit is coupled with one sensor. The detection unit comprises an input node, an arithmetic unit, at least one compensation unit and at least one electrostatic discharge protection unit.
Description
Technical field
The invention relates to a kind of testing apparatus, refer to a kind of equipment of testing contact panel especially, it is to utilize special circuit to detect the testing apparatus of small capacitance signal on the contact panel.
Background technology
At present touch technology comprises resistance-type, condenser type, infrared-type, sound wave type, optical profile type, induction and digital etc.Wherein resistance-type has advantage because of simple in structure and cost, enjoy the highest city for a long time and account for rate, and the surface capacitance type technology is that resistance-type is unrivaled in tolerance, optic advantage, though but the past is subject to patent limitation, add that cost is higher,, and use for society owing to these patent limitation are out of date in recent years so its city accounts for rate all the time not as good as resistance-type, and be indebted to the progress of optical technology, therefore the new opportunity that will bring condenser type to popularize.
Comprehensively above-mentioned, the demand of testing capacitor formula contact panel has the trend that increases gradually.Yet the capacitance signal output stage of capacitance type touch-control panel small (fF grade) and be subjected to noise easily is so the Circuits System that needs to resist the stray capacitance in noise and the buffer circuit is come this small capacitance signal of sensing exactly.
The existing desire that is used for contact panel that shows Fig. 1 detects the synoptic diagram of the circuit that tiny signal amplifies; this circuit is to use an amplifier that the small capacitance signal Vin that desire detects is amplified, and couples two PN diodes as the Electrostatic Discharge holding circuit in amplifier input terminal again.But the PN diode is a cavity type junction rectifier, itself can form small capacitance (for example stray capacitance (Parasitic Capacitor)), so output signal Vout can't learn reliable capacitance from input small capacitance signal Vin, and is subjected to direct current (DC) the voltage/current interference that input signal Vin carries secretly easily because the influence of PN diode small capacitance will cause output signal Vout to change.Fig. 2 shows the synoptic diagram of another available circuit, uses a capacitor C bias, makes the voltage of node voltage Vg and direct current (DC) voltage/current irrelevant, gets rid of influence of direct current, and can detect the variation of input signal Vin exactly.But the PN diode still can produce small capacitance, and circuit still can't obtain reliable capacitance.
In view of this, still be necessary to develop the pick-up unit of new detection small capacitance signal, can resist the stray capacitance in noise and the buffer circuit, exactly this small capacitance signal of sensing and be applicable to the function that measures capacitance type touch-control panel.
Summary of the invention
At the problems referred to above, in order to meet the requirement on the industry, the purpose of this invention is to provide a kind of testing apparatus and pick-up unit thereof, exactly this small capacitance signal of sensing and be applicable to the function of measuring capacitance type touch-control panel.
In order to achieve the above object, provide a kind of testing apparatus according to an aspect of the present invention, in order to test the function of a contact panel.This testing apparatus includes a plurality of sensors, a detection module and a judge module.These sensors are in order to a plurality of small capacitance signals of this contact panel of sensing.This detection module receives also handles these a plurality of small capacitance signals, and producing a plurality of output signals, and this detection module includes a plurality of detecting units.Each this detecting unit couples this sensor.This detecting unit includes an input node (Ng), an arithmetic element, at least one compensating unit and at least one electrostatic discharge (ESD) protection unit.This input node (Ng) receives this small capacitance signal.This arithmetic element couples this input node (Ng), and handles or amplify small capacitance signal after this filtration, to produce this output signal.First end of this compensating unit couples this input node, and second end is in order to receive a compensating signal.This electrostatic discharge (ESD) protection unit, in order to this testing apparatus and this contact panel are carried out electrostatic discharge (ESD) protection, and its first end couples a power supply, and second end couples second end of this compensating unit and forms a first node.Wherein, this compensating signal equals this small capacitance signal and produces voltage level in this input node in the voltage level that this first node produces.This judge module couples this detection module, and judges that according to these a plurality of output signals whether this contact panel is by test.
In an embodiment of the present invention, this at least one compensating unit can include: one first compensating unit, its first end couple this input node and second end in order to receive a compensating signal; With one second compensating unit, its first end couples this input node and second end in order to receive a compensating signal; And this at least one electrostatic discharge (ESD) protection unit can include: one first electrostatic discharge (ESD) protection unit, and its first end couples one first power supply, and second end couples second end of this first compensating unit and forms a first node; With one second electrostatic discharge (ESD) protection unit, its first end couples a second source, and second end couples second end of this second compensating unit and forms a Section Point.
Provide a kind of according to a further aspect of the invention, include a sensor and a detecting unit in order to detect the pick-up unit of contact panel.This sensor is in order to a small capacitance signal of this contact panel of sensing, and this detecting unit couples this sensor.This detecting unit includes: an input node (NG), receive this small capacitance signal, and produce a node voltage in this input node; One arithmetic element is handled or is amplified this small capacitance signal, to produce an output signal; At least one electrostatic discharge (ESD) protection unit couples this input node, to carry out electrostatic discharge protection; And at least one compensating unit provides at least one other end that equals the feedback voltage of this node voltage to this electrostatic discharge (ESD) protection unit, the influence that this node voltage is caused with the stray capacitance that compensates this electrostatic discharge (ESD) protection unit.
Useful technique effect of the present invention is: testing apparatus of the present invention and pick-up unit, this small capacitance signal of sensing and be applicable to the function of measuring capacitance type touch-control panel exactly.
Description of drawings
Fig. 1 shows the synoptic diagram of existing signal amplification technique.
Fig. 2 shows the synoptic diagram of the existing signal amplification technique of improveing Fig. 1.
Fig. 3 shows the synoptic diagram according to the testing apparatus of one embodiment of the invention.
Fig. 4 shows the synoptic diagram of detecting unit according to an embodiment of the invention.
Fig. 5 shows the synoptic diagram of detecting unit according to another embodiment of the present invention.
Fig. 6 shows the synoptic diagram of detecting unit according to another embodiment of the present invention.
Fig. 7 A and Fig. 7 B show the synoptic diagram of arithmetic element according to an embodiment of the invention.
Embodiment
Below, describe enforcement aspect of the present invention in detail.
One embodiment of the invention disclose a testing apparatus 100.Fig. 3 shows the synoptic diagram according to the
testing apparatus100 of one embodiment of the invention.This
testing apparatus100 includes a plurality of
sensors200, a
detection module300 and a
judge module400.
These
sensors200 are in order to a plurality of small capacitance signal Vin of this determinand 10 (contact panel) of sensing.Must note, be the complexity of simplified illustration,
sensor200 is to draw with simple line segment in the icon, and the operator who is familiar with this area should be able to understand according to icon and explanation, and adopts the various present existing or future sensors that develop to implement.This
detection module300 receives also handles these a plurality of small capacitance signal Vin, and producing a plurality of output signal Vout, and this
detection module300 includes a plurality of detecting units 310.Each this detecting unit 310 couples this sensor 200.For example this
testing apparatus100 can comprise the
individual sensor200 of 12 (4x3) and 12 detecting units 310.Fig. 4 shows the synoptic diagram of detecting unit 310 according to an embodiment of the invention.This detecting unit 310 includes an input node (Ng), an
arithmetic element340, two compensating units 321,322, two electrostatic discharge (ESD) protection unit 331,332 and filter unit Cbias.This filter unit Cbias couples this input node (Ng), in order to filter the direct current composition of this small capacitance signal.
As shown in Figure 4, wherein first end of compensating
unit321 couples this input node and second end in order to receiving a compensating signal, and first end of compensating
unit322 couples this input node (Ng) and second end in order to receive a compensating signal.Wherein, the voltage level that this compensating signal produces in this first node (N1); equal this small capacitance signal and import node (Ng) in this and produce voltage level (Vg), with so that this small capacitance signal, be not subjected to the interference of the stray capacitance that this electrostatic discharge (ESD) protection unit produced.In the example as this figure, this compensating signal is this output (negative feedback) signal.And behind the compensating
unit322 reception compensating signals, the voltage level V2 that produces in Section Point (N2) also can equal voltage level (Vg).Therefore; between node N1, the Ng with node Ng, N1 between current potential identical; no current circulate in first power supply (+Vdd) and second source (Vdd); so the stray capacitance (Parasitic Capacitor) that electrostatic discharge (ESD) protection unit 331,332 forms does not just have effect, and can't the small capacitance signal Vin by node Ng be impacted.
Electrostatic discharge (ESD) protection unit 331,332 provides the function of circuit electrostatic discharge (ESD) protection.First end of this electrostatic discharge (ESD)
protection unit331 couple one first power supply (+Vdd), second end couples second end of this compensating
unit321 and forms a first node (N1); And electrostatic discharge (ESD)
protection unit332, its first end couples a second source (Vdd or ground connection), and second end couples second end of this compensating
unit322 and forms a Section Point (N2).
340 couples input node (Ng), and handles or amplify small capacitance signal after this filtrations, with generation output signal Vout.
This
judge module400 couples this
detection module300, and whether judges this contact panel by test (GO/NG) according to these a plurality of output signals, if classify as non-defective unit by test (GO), if do not classify as defective products by (NG).
Design according to this mode; the small capacitance signal Vin that the detecting unit 310 of the embodiment of the invention is detected; to can not be subjected to electrostatic discharge (ESD) protection unit 331,332 formed stray capacitances and disturb, and can solve prior art problems, reach the effect of accurate detection signal.
In addition, in another embodiment (not icon), this compensating signal can be provided by a power supply or other external device (ED), and the voltage level that this first node (N1) is produced equals this small capacitance signal and imports node (Ng) generation voltage level (Vg) in this.This mode also can reach identical effect, solves electrostatic discharge (ESD) protection unit 331,332 formed stray capacitance interference problems.
Fig. 5 shows the synoptic diagram of detecting unit 310 according to another embodiment of the present invention.Simultaneously with reference to Fig. 4 and Fig. 5; present embodiment (Fig. 5) and the foregoing description (Fig. 4) difference; this detecting unit that is Fig. 5 also comprises two RC low-pass filters (a RC low-pass filter and the 2nd RC low-pass filter); first end of the one this first node of RC low pass filter coupled (N1), this electrostatic discharge (ESD)
protection unit331 and the output terminal of this
arithmetic element340; and first end of the 2nd this Section Point of RC low pass filter coupled (N2), this electrostatic discharge (ESD)
protection unit332 and the output terminal of this
arithmetic element340, in order to this compensating signal stably to be provided.Must notice that RC low-pass filter herein only is an example, the present invention can adopt existing at present or be that the various wave filters that develop are implemented.
Fig. 6 shows the synoptic diagram of detecting unit 310 according to another embodiment of the present invention.Simultaneously with reference to Fig. 4 and Fig. 6, present embodiment (Fig. 6) and the foregoing description (Fig. 4) difference, this detecting unit that is Fig. 6 also comprises two arithmetical unit G1 and G2, the input end of G1 couples the output terminal of this
arithmetic element340 and the output terminal of arithmetical unit G1 couples this first node (N1), the input end of arithmetical unit G2 couples the output terminal of this
arithmetic element340 and the output terminal of arithmetical unit G2 couples this Section Point (N2), in order to this compensating signal stably to be provided.
In the foregoing description, this compensating unit can be a PN junction rectifier.And this arithmetic element can be an amplifier, for example the mos field effect transistor (MOSFET) of the anti-phase closed loop amplifier of Fig. 7 A or Fig. 7 B.In the above embodiments, the capacitance that this small capacitance signal comprises is less than or equal to 1pF, and certainly, these data only are example, and the present invention is not limited to this data.Moreover this judge module can be implemented by an interface and a disposal system that receives this output signal, and for example this disposal system can be a computing machine.
In sum, according to pick-up unit of the present invention and testing apparatus, can detect the small capacitance signal and provide the pick-up unit avoiding disturbing and testing apparatus that the test contact panel is used, sensing small capacitance signal exactly is specially adapted to testing capacitor formula contact panel or with the various electronic products of capacitance type touch-control panel.
Though more than with specific embodiment explanation the present invention; but therefore do not limit scope of the present invention; only otherwise break away from main idea of the present invention; being familiar with present technique person understands not breaking away under the intent of the present invention and the scope and can carry out various distortion or change; for example can comprise 2,4 or 6 compensating units, perhaps can comprise 2,4 or 6 electrostatic discharge (ESD) protection unit in detecting unit.For example this determinand can be various electronic products with contact panel again.
Claims (11)
1.一种测试设备，用以测试一触控面板的功能，其特征在于，该测试设备包含有：1. A kind of testing equipment, in order to test the function of a touch panel, it is characterized in that, this testing equipment comprises: 多个传感器，用以感测一待测物的多个微小电容信号；A plurality of sensors are used to sense a plurality of small capacitance signals of an object to be measured; 一检测模块，接收并处理该多个微小电容信号，以产生多个输出信号，其中该检测模块包含有：A detection module receives and processes the multiple tiny capacitance signals to generate multiple output signals, wherein the detection module includes: 多个检测单元，每一该检测单元耦接一该传感器，该检测单元包含有：A plurality of detection units, each of which is coupled to a sensor, the detection unit includes: 一输入节点(Ng)，接收该微小电容信号；an input node (Ng) for receiving the tiny capacitance signal; 一运算单元，耦接该输入节点(Ng)，并处理或放大过滤后的微小电容信号，以产生该输出信号；An operation unit, coupled to the input node (Ng), and processes or amplifies the filtered small capacitance signal to generate the output signal; 至少一补偿单元，其第一端耦接该输入节点，第二端用以接收一补偿信号；At least one compensation unit, the first end of which is coupled to the input node, and the second end is used to receive a compensation signal; 至少一静电放电保护单元，用以对该测试设备与该触控面板进行静电放电保护，且其第一端耦接一电源，第二端耦接该补偿单元的第二端并形成一第一节点；At least one electrostatic discharge protection unit is used for electrostatic discharge protection of the test equipment and the touch panel, and its first end is coupled to a power supply, and its second end is coupled to the second end of the compensation unit to form a first node; 其中该补偿信号于该第一节点产生的电压电平，等于该微小电容信号于该输入节点产生电压电平；Wherein the voltage level generated by the compensation signal at the first node is equal to the voltage level generated by the tiny capacitance signal at the input node; 一判断模块，耦接该检测模块，根据该多个输出信号判断该触控面板是否通过测试。A judgment module, coupled to the detection module, judges whether the touch panel passes the test according to the multiple output signals. 2.根据权利要求1所述的测试设备，其特征在于，该至少一补偿单元包含有：2. The testing device according to claim 1, wherein the at least one compensation unit comprises: 一第一补偿单元，其第一端耦接该输入节点且第二端用以接收一补偿信号；与a first compensation unit, the first end of which is coupled to the input node and the second end is used to receive a compensation signal; and 一第二补偿单元，其第一端耦接该输入节点且第二端用以接收一补偿信号；以及a second compensation unit, the first end of which is coupled to the input node and the second end is used to receive a compensation signal; and 该至少一静电放电保护单元包含有：The at least one electrostatic discharge protection unit includes: 一第一静电放电保护单元，其第一端耦接一第一电源，第二端耦接该第一补偿单元的第二端并形成一第一节点；与A first electrostatic discharge protection unit, the first end of which is coupled to a first power supply, the second end is coupled to the second end of the first compensation unit and forms a first node; and 一第二静电放电保护单元，其第一端耦接一第二电源，第二端耦接该第二补偿单元的第二端并形成一第二节点。A second electrostatic discharge protection unit, the first end of which is coupled to a second power supply, and the second end of which is coupled to the second end of the second compensation unit to form a second node. 3.根据权利要求1所述的测试设备，其特征在于，该补偿信号为该输出信号，该输出是负反馈。3. The testing device according to claim 1, wherein the compensation signal is the output signal, and the output is negative feedback. 4.根据权利要求1所述的测试设备，其特征在于，该检测单元还包含有一滤波单元，耦接该输入节点(Ng)，用以过滤该微小电容信号的直流成份。4. The testing device according to claim 1, wherein the detection unit further comprises a filter unit coupled to the input node (Ng) for filtering the DC component of the small capacitance signal. 5.根据权利要求1所述的测试设备，其特征在于，该补偿信号是由一电源所提供。5. The testing device according to claim 1, wherein the compensation signal is provided by a power supply. 6.根据权利要求1所述的测试设备，其特征在于，该检测单元还包含有至少一低通滤波器，耦接该第一节点、该静电放电保护单元的第一端及该运算单元的输出端，用以稳定地提供该补偿信号。6. The testing device according to claim 1, wherein the detection unit further comprises at least one low-pass filter coupled to the first node, the first end of the electrostatic discharge protection unit and the computing unit The output terminal is used to provide the compensation signal stably. 7.根据权利要求1所述的测试设备，其特征在于，该检测单元还包含有至少一放大器，其输入端耦接该运算单元的输出端且输出端耦接该第一节点，用以稳定地提供该补偿信号。7. The testing device according to claim 1, wherein the detection unit further comprises at least one amplifier, the input end of which is coupled to the output end of the operation unit and the output end is coupled to the first node, for stabilizing ground to provide the compensation signal. 8.根据权利要求1所述的测试设备，其特征在于，该补偿单元为一PN接面二极管，该运算单元为一放大器。8. The testing device according to claim 1, wherein the compensation unit is a PN junction diode, and the operation unit is an amplifier. 9.根据权利要求1所述的测试设备，其特征在于，该运算单元为一反相闭回路放大器或一金属氧化物半导体场效应晶体管。9. The testing device according to claim 1, wherein the computing unit is an inverting closed-loop amplifier or a MOSFET. 10.根据权利要求1所述的测试设备，其特征在于，该待测物为一触控面板或附有触控面板的各式电子制品。10 . The testing device according to claim 1 , wherein the object under test is a touch panel or various electronic products with a touch panel. 11 . 11.一种检测装置，用以检测触控面板的功能，其特征在于，包含有：11. A detection device for detecting the function of a touch panel, characterized in that it comprises: 一传感器，用以感测该触控面板的一微小电容信号；以及a sensor for sensing a tiny capacitive signal of the touch panel; and 一检测单元，耦接该传感器，该检测单元包含有：A detection unit, coupled to the sensor, the detection unit includes: 一输入节点(NG)，接收该微小电容信号，于该输入节点产生一节点电压；An input node (NG), which receives the tiny capacitance signal and generates a node voltage at the input node; 一运算单元，处理或放大该微小电容信号，以产生一输出信号；an arithmetic unit, processing or amplifying the tiny capacitance signal to generate an output signal; 至少一静电放电保护单元，耦接该输入节点，以执行静电放电保护功能；at least one electrostatic discharge protection unit coupled to the input node to perform an electrostatic discharge protection function; 至少一补偿单元，提供至少一等于该节点电压的反馈电压至该静电放电保护单元的另一端，以补偿该静电放电保护单元的杂散电容对该节点电压造成的影响。At least one compensation unit provides at least one feedback voltage equal to the node voltage to the other end of the ESD protection unit to compensate the influence of the stray capacitance of the ESD protection unit on the node voltage.
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| CN2010101344056A CN102193695A (en) | 2010-03-05 | 2010-03-05 | Touch panel test equipment and its detection device |
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| CN2010101344056A CN102193695A (en) | 2010-03-05 | 2010-03-05 | Touch panel test equipment and its detection device |
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| CN103092397A (en) * | 2011-11-03 | 2013-05-08 | 群康科技(深圳)有限公司 | Touch panel for electrostatic discharge protection and electronic device using the same |
| CN103207713A (en) * | 2012-01-16 | 2013-07-17 | 晨星软件研发(深圳)有限公司 | Signal processing method of touch panel and touch panel system |
| CN105677119A (en) * | 2014-11-18 | 2016-06-15 | 敦泰科技有限公司 | Capacitive touch screen and detection circuit thereof, electronic equipment |
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| CN103092397A (en) * | 2011-11-03 | 2013-05-08 | 群康科技(深圳)有限公司 | Touch panel for electrostatic discharge protection and electronic device using the same |
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| CN105677119A (en) * | 2014-11-18 | 2016-06-15 | 敦泰科技有限公司 | Capacitive touch screen and detection circuit thereof, electronic equipment |
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| 2011-11-23 | C10 | Entry into substantive examination | |
| 2011-11-23 | SE01 | Entry into force of request for substantive examination | |
| 2013-09-11 | C02 | Deemed withdrawal of patent application after publication (patent law 2001) | |
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Application publication date: 20110921 |