CN204557437U - A kind of touch control capacitance screen testing agency - Google Patents
A kind of touch control capacitance screen testing agency Download PDFInfo
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- CN204557437U CN204557437U CN201520027389.9U CN201520027389U CN204557437U CN 204557437 U CN204557437 U CN 204557437U CN 201520027389 U CN201520027389 U CN 201520027389U CN 204557437 U CN204557437 U CN 204557437U
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Abstract
The utility model discloses a kind of touch control capacitance screen testing agency, its sensor comprises and is laid in the sensor electrode of pcb board top layer and the touch controller of bottom and sensor electrical polar curve, described sensor adopts relaxation oscillator circuit and sensing circuit, described relaxation oscillator circuit is provided with the comparer connected successively, pulse-width modulator PWM and 16 digit counters, the input termination capacitor CP of wherein said comparer, export the clock input circuit of termination pulse-width modulator PWM, described sensing circuit is provided with interconnective chip U1 and U2, each connection capacitance sensing button on four pins of chip U1, chip U2 is connected with connector DB9.Electrode and electrode wires are laid in the different surfaces of pcb board by the utility model, effectively can prevent interference, pulse-width modulator PWM carries out gate to 16 digit counters, energy Detection capacitance subtle change, be applicable to micro-capacitance detecting, sensing circuit is connected with connector DB9, can realize capacitive sensing and serial communication.
Description
Technical field
The utility model relates to capacitive touch screen field, relates in particular to a kind of touch control capacitance screen testing agency.
Background technology
Capacitance type sensor is the class sensor change of tested non electrical quantity being converted to electric capacitance change, because it has the advantages such as highly sensitive, low in energy consumption, temperature drift is little, is therefore widely used in the measurements such as pressure, humidity, temperature and acceleration.Capacitive touch screen is a kind of new touch screen technology, primarily of touch detection part and touch screen controller composition, touching detection part is arranged in face of indicator screen, for detecting user touch location, send into touch screen controller after reception, and the Main Function of touch screen controller receives touch information from touch point detection device, and convert it to contact coordinate, give CPU again, it can receive order that CPU sends simultaneously and be performed.Due to capacitive touch screen function admirable, be widely used in mobile phone, panel computer, LCD TV etc. with in the electronic product of touch apparatus.The sensitivity touching detection part detection finger touch position directly has influence on the performance of product, in prior art, unreasonable due to electronic component each on pcb board and configuration, cause the detection failure touching detection part, in addition in order to adapt to product needed, the volume of sensor is also more and more less, the capacitance of sensitive electrical container is also along with diminishing, and the capacitance variations that finger touch causes is very small, be generally fF even aF magnitude, the design of so little variable quantity to testing circuit is a challenge, and traditional cannot adapt to the ever-reduced trend of sensor capacitance by the method that discrete component builds testing circuit, therefore the circuit designing coupling is very necessary.
Utility model content
The purpose of this utility model is, for the problems referred to above, provides the touch control capacitance screen testing agency of a kind of components and parts connection and reasonable arrangement, touch-sensitive.
For achieving the above object, the utility model adopts following technical scheme:
A kind of touch control capacitance screen testing agency, comprise sensor, described sensor comprises the sensor electrode being laid in pcb board top layer and the touch controller being arranged on pcb board bottom and sensor electrical polar curve, described sensor adopts relaxation oscillator circuit and sensing circuit, described relaxation oscillator circuit is provided with comparer, pulse-width modulator PWM and 16 digit counters, the input termination capacitor CP of described comparer, export the clock input circuit of pulse-width modulator PWM described in termination, described pulse-width modulator PWM is electrically connected with 16 digit counters, described sensing circuit is provided with chip U1 and chip U2, four pins of described chip U1 are respectively connected with a capacitance sensing button, described chip U1 is connected with chip U2, described chip U2 is then connected with connector DB9.
Further, the top layer of described pcb board and the white space of bottom are filled with ground connection Copper Foil, and described Copper Foil forms reticulate texture, and the thickness of described pcb board is between 0.6-1.6mm.
Further, described pcb board is pasted with insulated rubber film.
Further, the clock frequency of described 16 digit counters is 24MHz.
Further, the model of described chip U1 is CY8C21434, and the model of described chip U2 is MAX232.
Further, also comprise glass cover-plate, described glass cover-plate is connected by the top layer of bonding agent with described pcb board.
Implement the utility model and there is following beneficial effect: electrode and electrode wires are laid in the different surfaces of pcb board by the utility model respectively, effectively can prevent both interference mutually, avoid the appearance touching failure, fill ground connection Copper Foil at the top layer of pcb board and the white space of bottom simultaneously, crosstalk can be reduced, relaxation oscillator circuit carries out gate by pulse-width modulator PWM to 16 digit counters, finger above sensor makes electric capacity CP increase, and then cause the count value of 16 digit counters to increase, detect with this position to touch point, the subtle change of electric capacity can be detected, be applicable to the detection of micro-electric capacity, sensing circuit is connected with connector DB9, can realize capacitive sensing and serial communication.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is relaxation oscillator circuit figure of the present utility model;
Fig. 3 is sensing circuit figure of the present utility model.
In figure: 1, glass cover-plate; 2, bonding agent; 3, sensor electrode; 4, pcb board; 5, touch controller.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of touch control capacitance screen testing agency, comprise sensor, glass cover-plate 1 and pcb board 4, glass cover-plate 1 is connected with the top layer of pcb board 4 by bonding agent 2, and bonding agent 2 is transparent OCA optical cement.Sensor comprises the sensor electrode 3 being laid in pcb board 4 top layer and the touch controller 5 being arranged on pcb board 4 bottom and sensor electrical polar curve, sensor electrode 3 is made up of the electrode that X moves towards and Y moves towards, the electrode centre separation layer of X trend and Y trend separates, and draws sensor electrical polar curve respectively simultaneously and be connected with the circuit on pcb board 4 in X trend with the electrode of Y trend.For preventing interference, be filled with ground connection Copper Foil at the top layer of pcb board 4 and the white space of bottom, Copper Foil forms reticulate texture, and simultaneously by insulated rubber film on pcb board 4 surface mount, the thickness of pcb board 4 is between 0.6-1.6mm.
As shown in Figures 2 and 3, sensor adopts relaxation oscillator circuit and sensing circuit, the comparer that relaxation oscillator circuit is provided with, pulse-width modulator PWM and 16 digit counters, the input termination capacitor CP of comparer, export the clock input circuit of termination pulse-width modulator PWM, pulse-width modulator PWM is electrically connected with 16 digit counters, gate is carried out to 16 digit counters, finger above sensor makes electric capacity CP increase, and then causing the count value of 16 digit counters to increase, the existence of finger detects based on this principle.The clock frequency of 16 digit counters is 24MHz.In order to realize capacitive sensing and serial communication, sensing circuit is provided with interconnective chip U1 and chip U2, and the model of chip U1 is CY8C21434, and the model of chip U2 is MAX232.Four pins of chip U1 are respectively connected with a capacitance sensing button, chip U1 by one comprise power supply, and the ISSP joint of programming pin SCL and SDA realize programming.Chip U2 is responsible for the level shift processing RS232, and is connected with connector DB9, to set up communication linkage.
The utility model is not limited to above-mentioned embodiment; anyone can draw other various forms of products under enlightenment of the present utility model; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (6)
1. a touch control capacitance screen testing agency, comprise sensor, it is characterized in that: described sensor comprises the sensor electrode (3) being laid in pcb board (4) top layer and the touch controller (5) being arranged on pcb board (4) bottom and sensor electrical polar curve, described sensor adopts relaxation oscillator circuit and sensing circuit, described relaxation oscillator circuit is provided with comparer, pulse-width modulator PWM and 16 digit counters, the input termination capacitor CP of described comparer, export the clock input circuit of pulse-width modulator PWM described in termination, described pulse-width modulator PWM is electrically connected with 16 digit counters, described sensing circuit is provided with chip U1 and chip U2, four pins of described chip U1 are respectively connected with a capacitance sensing button, described chip U1 is connected with chip U2, described chip U2 is then connected with connector DB9.
2. a kind of touch control capacitance screen testing agency according to claim 1, it is characterized in that: the top layer of described pcb board (4) and the white space of bottom are filled with ground connection Copper Foil, described Copper Foil forms reticulate texture, and the thickness of described pcb board (4) is between 0.6-1.6mm.
3. a kind of touch control capacitance screen testing agency according to claim 2, is characterized in that: (4) are pasted with insulated rubber film to described pcb board.
4. a kind of touch control capacitance screen testing agency according to claim 1, is characterized in that: the clock frequency of described 16 digit counters is 24MHz.
5. a kind of touch control capacitance screen testing agency according to claim 1, it is characterized in that: the model of described chip U1 is CY8C21434, the model of described chip U2 is MAX232.
6. a kind of touch control capacitance screen testing agency according to claim 1, it is characterized in that: also comprise glass cover-plate (1), described glass cover-plate (1) is connected by the top layer of bonding agent (2) with described pcb board (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520027389.9U CN204557437U (en) | 2015-01-15 | 2015-01-15 | A kind of touch control capacitance screen testing agency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520027389.9U CN204557437U (en) | 2015-01-15 | 2015-01-15 | A kind of touch control capacitance screen testing agency |
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| Publication Number | Publication Date |
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| CN204557437U true CN204557437U (en) | 2015-08-12 |
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| CN201520027389.9U Active CN204557437U (en) | 2015-01-15 | 2015-01-15 | A kind of touch control capacitance screen testing agency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192921A (en) * | 2017-07-17 | 2017-09-22 | 南京华睿川电子科技有限公司 | A kind of test circuit, test board and the method for testing of button capacitance plate |
-
2015
- 2015-01-15 CN CN201520027389.9U patent/CN204557437U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192921A (en) * | 2017-07-17 | 2017-09-22 | 南京华睿川电子科技有限公司 | A kind of test circuit, test board and the method for testing of button capacitance plate |
| CN107192921B (en) * | 2017-07-17 | 2023-10-17 | 南京华睿川电子科技有限公司 | Testing circuit, testing board and testing method of button type capacitive screen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: CINOTOP ELECTRONICS CO., LTD. Assignor: Su Wei Contract record no.: 2015440020328 Denomination of utility model: Touch-control electric capacity screen detection mechanism Granted publication date: 20150812 License type: Exclusive License Record date: 20151012 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160630 Address after: 518110 Guangdong province Shenzhen city Longhua District No. two Fu Guanlan Street Community Ao Bei Dafu Industrial Zone Peng Longpan high-tech park B building 4 floor Patentee after: CINOTOP ELECTRONICS CO., LTD. Address before: 518110 Guangdong province Shenzhen city road two Dafu Dafu Industrial Zone, Baoan District Guanlan town Peng Longpan high-tech park B building 4 floor Patentee before: Su Wei |