CN209168077U - A kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment - Google Patents
A kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment Download PDFInfo
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- CN209168077U CN209168077U CN201821602865.5U CN201821602865U CN209168077U CN 209168077 U CN209168077 U CN 209168077U CN 201821602865 U CN201821602865 U CN 201821602865U CN 209168077 U CN209168077 U CN 209168077U
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- touch screen
- switching tube
- tvs pipe
- electrically connected
- pin
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Abstract
The utility model discloses a kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipments, touch screen electrostatic surge absorbing circuit is used to be connected between the positive pin and negative pin for touching chip, including TVS pipe, switching tube, first resistor and second resistance, the anode of TVS pipe is electrically connected by first resistor with negative pin, the cathode of TVS pipe is electrically connected with positive pin, the first end of switching tube is electrically connected with the anode of TVS pipe, the second end of switching tube is electrically connected with positive pin, and the third end of switching tube is electrically connected by second resistance with negative pin.When environment or human body generate higher electrostatic potential and TVS pipe are caused to be connected, electric current flows through TVS pipe and first resistor, to make switching tube be connected, impedance between the second end and third end of switching tube quickly reduces, to make to establish impedance path by switching tube between positive pin and negative pin, to make static radiation quick release, prevent electrostatic damage from touching chip.
Description
Technical field
The utility model relates to electronic technology field more particularly to a kind of touch screen electrostatic surge absorbing circuits, touch screen
And electronic equipment.
Background technique
Currently, capacitive touch screen has been widely used for the equipment such as household electrical appliance, computer, mobile phone, medical treatment, automobile
On, the operation to host can be realized by image in finger touch display screen or text, so that human-computer interaction is more
It is simple and convenient.
Capacitive touch screen is that different ITO conducting wire modules is etched on two layers of ITO electro-conductive glass coating.Two
The figure etched in module is mutually perpendicular to, they can be regarded as the draw runner of X and Y-direction consecutive variations.Since X, Y framework exist
Different surfaces, intersection form a capacitive node, and it is detecting that a draw runner can be treated as driving line, another draw runner
Line.When electric current is through a conducting wire in line of overdriving, if the extraneous signal for having capacitance variations, will cause another layer
The variation of capacitive node on conducting wire.The variation of detecting capacitance can be obtained by the electronic loop measurement being attached thereto, then be passed through
Digital signal is switched to by A/D controller and does calculation process acquirement (X, Y) shaft position by computer, and then with reaching the mesh of positioning.
When operation, controller successively gives driving line for electric current, thus makes to form a specific electric field between each node and conducting wire.Then it sweeps by column
It retouches sense wire and measures its interelectrode capacitance change, to reach multipoint positioning.When finger or close touch medium, control
Device predicts rapidly the change of the capacitance between touch-control node and conducting wire, and then confirms the position of touch-control.A this axis passes through a set of
AC signal drives, and the response for passing through touch screen is then come out by the electrode senses on other axis.Users call this
' crossing formula ' induction, alternatively referred to as projection-type incude.X, the ITO pattern of Y-axis, when finger touches Touch Screen are coated on sensor
When surface, the capacitance below touch points increases according to the distance of touch point, the scanning probe of sensor continuity from above to electricity
The variation of capacitance, control chip calculate touch point and feed back to processor.Nowadays, capacitance touch screen has evolved to multiple spot electricity
Hold the mode touched, the feature of multiple spot capacitance touch maximum be can the operation to screen with multiple fingers while realization so that electric
It is more convenient and humanized to hold touch screen.
Capacitive technologies are wear-resistant, the service life is long, and maintenance cost when user uses is low, and capacitance touch screen has positioning single-point
Track, simulation double click be its most basic function, and for multi-finger gesture operation identification and be applied in order to current
The hot spot in market.In portable application, the gestures such as crawl, translation, stretching, extension, compression, rotation and the page turning of more fingers are identified
Operation is just particularly important.But capacitance touch screen in production assembly and in use, is easy by the quiet of human body and environment
Electric radiation damage touches chip, thus the failure for causing touch screen to fail.
Utility model content
For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of touch screen electrostatic surge absoptions
Circuit, to solve the problems, such as that the touch chip of existing touch screen is easily damaged by static radiation.
The purpose of this utility model adopts the following technical scheme that realization:
A kind of touch screen electrostatic surge absorbing circuit, for be connected to touch chip positive pin and negative pin it
Between, including TVS pipe, switching tube, first resistor and second resistance, the anode of the TVS pipe by the first resistor with it is described
Negative pin electrical connection, the cathode of the TVS pipe with it is described anode pin be electrically connected, the first end of the switching tube with it is described
The anode electrical connection of TVS pipe, the second end of the switching tube are electrically connected with the positive pin, and the third end of the switching tube is logical
The second resistance is crossed to be electrically connected with the negative pin.
Further, the switching tube is triode or metal-oxide-semiconductor, and the first end is base stage, and the second end is current collection
Pole, the third end are emitter.
Further, the resistance value of the first resistor is 10K ohm.
Further, the resistance value of the second resistance is 0 ohm.
The utility model also provides a kind of touch screen, including touching chip and above-mentioned touch screen electrostatic surge absoption electricity
Road.
The utility model also provides a kind of electronic equipment, including power supply and above-mentioned touch screen.
Compared with prior art, the utility model has the beneficial effects that: by the way that the cathode of TVS pipe and touch chip is positive
Pin connection, when environment or human body generate higher electrostatic potential and TVS pipe caused to be connected, electric current flows through TVS pipe and first
Resistance, so that switching tube be made to be connected, the impedance between the second end and third end of switching tube is quickly reduced, to make positive pin
Impedance path is established by switching tube between negative pin, to make static radiation quick release, prevents electrostatic damage from touching
Touch chip.
Detailed description of the invention
Fig. 1 is touch screen electrostatic surge absorbing circuit schematic diagram provided by the embodiment of the utility model.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the utility model, it should be noted that
Under the premise of not colliding, it can be formed in any combination between various embodiments described below or between each technical characteristic new
Embodiment.
As shown in Figure 1, touch screen electrostatic surge absorbing circuit provided in an embodiment of the present invention, for being connected to touch chip
Between the positive pin VDD and negative pin GND of U1, including TVS pipe D1, switching tube Q1, first resistor R1 and second resistance R2,
The anode of TVS pipe D1 is electrically connected by first resistor R1 with negative pin GND, and cathode and the anode pin VDD of TVS pipe D1 is electrically connected
It connecing, the first end of switching tube Q1 is electrically connected with the anode of TVS pipe D1, and the second end of triode Q1 is electrically connected with positive pole VDD,
The third end of triode Q1 is electrically connected by second resistance R2 with power cathode GND.Touch the positive pin and cathode of chip U1
Pin is connect with positive pole and power cathode respectively, and the electrostatic threshold value for touching chip U1 is usually 4KV, when electrostatic potential radiates
When on to the positive pin VDD for touching chip U1, when TVS pipe D1 is connected, electric current flows through TVS pipe D1 and first resistor R1, thus
Switching tube Q1 is connected, the impedance between the second end and third end of switching tube Q1 quickly reduces, thus make positive pin VDD with
Impedance path is established by switching tube Q1 between negative pin GND, to make static radiation quick release, prevents electrostatic damage
Touch chip.The aerial drainage energy of electrostatic surge is increased simultaneously, reduces the power decoupling conjunction capacitor for touching chip U1 peripheral circuit
Capacity, improve the electroresponse time of touch screen.
As preferred embodiment, switching tube is triode or metal-oxide-semiconductor, and first end is base stage, and second end is collector,
Third end is emitter.The model GT9271 of chip U1 is touched, switching tube Q1 is the triode of model 8050, triode
Conducting voltage is that 0.7V makes the base stage and emitter of triode after the model ESD3V3S1B of TVS pipe D1, TVS pipe D1 conducting
Between voltage reach 0.7V, triode ON.
As preferred embodiment, the resistance value of first resistor R1 is 10K ohm, and the resistance value of second resistance R2 is 0 ohm,
Increase the resistance that resistance value is 0 in the front end negative pin GND for touching chip U1, improves the anti-electromagnetic interference capability of circuit.
The utility model embodiment also provides a kind of touch screen, including touching chip U1 and above-mentioned touch screen electrostatic surge
Absorbing circuit.
The utility model embodiment also provides a kind of electronic equipment, including power supply and above-mentioned touch screen.
Touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment provided by the embodiment of the utility model, work as electrostatic
When voltage causes TVS pipe D1 to be connected, electric current flows through TVS pipe D1 and first resistor R1, so that switching tube Q1 is connected, switching tube Q1
Second end and third end between impedance quickly reduce, to make to pass through switch between positive pin VDD and negative pin GND
Pipe Q1 establishes impedance path, to make static radiation quick release, prevents electrostatic damage from touching chip.
Above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacement belong to
In the utility model range claimed.
Claims (6)
1. a kind of touch screen electrostatic surge absorbing circuit, for being connected between the positive pin and negative pin that touch chip,
It is characterised in that it includes TVS pipe, switching tube, first resistor and second resistance, the anode of the TVS pipe passes through first electricity
Resistance is electrically connected with the negative pin, and the cathode of the TVS pipe is electrically connected with the positive pin, the first end of the switching tube
Be electrically connected with the anode of the TVS pipe, the second end of the switching tube is electrically connected with the anode pin, and the of the switching tube
Three ends are electrically connected by the second resistance with the negative pin.
2. touch screen electrostatic surge absorbing circuit according to claim 1, which is characterized in that the switching tube is triode
Or metal-oxide-semiconductor, the first end are base stage, the second end is collector, and the third end is emitter.
3. touch screen electrostatic surge absorbing circuit according to claim 1, which is characterized in that the resistance value of the first resistor
It is 10K ohm.
4. touch screen electrostatic surge absorbing circuit according to claim 1, which is characterized in that the resistance value of the second resistance
It is 0 ohm.
5. a kind of touch screen, which is characterized in that including touching chip and touch screen electrostatic according to any one of claims 1-4
Surge absorbing circuit.
6. a kind of electronic equipment, which is characterized in that including power supply and touch screen as claimed in claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821602865.5U CN209168077U (en) | 2018-09-29 | 2018-09-29 | A kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821602865.5U CN209168077U (en) | 2018-09-29 | 2018-09-29 | A kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209168077U true CN209168077U (en) | 2019-07-26 |
Family
ID=67332649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821602865.5U Active CN209168077U (en) | 2018-09-29 | 2018-09-29 | A kind of touch screen electrostatic surge absorbing circuit, touch screen and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209168077U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416989A (en) * | 2019-07-31 | 2019-11-05 | 东莞市卓品电子科技有限公司 | Protective device and guard method applied to communication interface |
-
2018
- 2018-09-29 CN CN201821602865.5U patent/CN209168077U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110416989A (en) * | 2019-07-31 | 2019-11-05 | 东莞市卓品电子科技有限公司 | Protective device and guard method applied to communication interface |
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