CN105204706A - Antistatic circuit for resistive touch screen and resistive touch screen - Google Patents
Antistatic circuit for resistive touch screen and resistive touch screen Download PDFInfo
- Publication number
- CN105204706A CN105204706A CN201510556486.1A CN201510556486A CN105204706A CN 105204706 A CN105204706 A CN 105204706A CN 201510556486 A CN201510556486 A CN 201510556486A CN 105204706 A CN105204706 A CN 105204706A
- Authority
- CN
- China
- Prior art keywords
- touch screen
- circuit
- screen
- touch
- resistive touch
- 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
Abstract
The invention relates to an antistatic circuit for a resistive touch screen and the resistive touch screen. The circuit comprises an isolation unit arranged between a touch screen driving circuit and a touch screen control circuit. The resistive touch screen comprises a touch screen body and the touch screen control circuit, wherein the antistatic circuit is arranged between the touch screen body and the touch screen control circuit and comprises the isolation unit arranged between the touch screen driving circuit and the touch screen control circuit. The circuit has the advantages of high electrostatic protection grade, simple circuit structure, low cost, small size and the like, influence of static electricity on the resistive touch screen can be effectively eliminated, the touch screen driving circuit works more stably, and the service life of the touch screen is longer.
Description
Technical field
The present invention relates to resistive touch screen field, particularly relate to a kind of resistive touch screen antistatic circuit and resistive touch screen.
Technical background
Touch-screen, as a kind of novel input equipment, is the simplest, convenient current, natural a kind of man-machine interaction mode, is widely used in the consumer electronics product such as mobile phone, PDA.But when resistive touch screen is applied to industrial products, the environment residing for industrial products is more severe, and its common demands ESD experimental grade is IEC61000-4-24 level.Therefore, the design of touch-screen electrostatic discharge protection circuit is had higher requirement.
Current four-wire resistance type touch screen is most widely used.Its structure is made up of line (glass or membraneous material) conducting ito layers and upper circuit (membraneous material) conducting ito layers.Centre has trickle insulating point to separate, and when touch screen surface does not have pressure, upper line is in open-circuit condition.Once there be pressure to be applied to touch screen surface, upper line will conducting, and controller applies driving voltage by line conducting ito layers on X-coordinate direction, by the probe in upper circuit conducting ito layers, voltage in detecting X-direction, extrapolates the X-coordinate of contact thus.Changed by controller and execute alive direction, in like manner can measure the Y-coordinate of contact, thus the position of clear and definite contact.
For the electrostatic discharge protection circuit of touch-screen, be generally adopt to increase ESD protective device in the place of sensitivity.But for the occasion that electrostatic defending class requirement is higher, adopt the protection circuit of this routine, effective protective effect can not be played, still there will be and touch drift, malfunctioning, system reset, deadlock, even damage device.An existing patent " a kind of electrostatic discharge protection circuit of resistive touch screen " at present, its design proposal utilizes magnetic bead, transient state killer tube, Resistor-Capacitor Unit builds electrostatic discharge protection circuit, its electrostatic protection effect has some improvement than single use ESD device, but find also there is certain problem in actual applications: when electrostatic grade is higher, the reference earth polar of touch screen circuitry is vulnerable to the interference of electrostatic pulse, once ground level is interfered, the control chip of touch-screen and other related application circuit also will be affected, can directly cause whole system blank screen, flower screen or deadlock.
So, for the defect of above-mentioned anti-static circuit, be badly in need of a kind of electrostatic discharge protection circuit that can be applied to the conjunction of electrostatic defending requirement high field of design.
Summary of the invention
The invention provides a kind of resistive touch screen antistatic circuit and resistive touch screen, be intended to solve existing touch-screen anti-static circuit and be not suitable for problem to the higher occasion of electrostatic defending class requirement.
For solving the problems of the technologies described above, resistive touch screen antistatic circuit of the present invention comprises isolated location, and described isolated location is arranged between driving circuit and touch screen control circuit.
ESD device is provided with between described driving circuit and touch-screen body.
Between touch-screen body and driving circuit, be connected with high frequency attenuation unit and transient voltage suppression unit in turn, described transient voltage suppresses unit through charge discharging resisting unit ground connection.
The input signal of described isolated location comprises control signal that touch-screen driver element exports, data-signal and power supply AVCC, in analog AGND, and output signal comprises the control signal after isolation, data-signal and power supply VCC, digitally GND.
Described isolated location is 4 passage high-speed figure isolating chips of charged isolation.
Resistive touch screen of the present invention comprises touch-screen body and touch screen control circuit, antistatic circuit is comprised between touch-screen body and touch screen control circuit, described antistatic circuit comprises isolated location, and described isolated location is arranged between driving circuit and touch screen control circuit.
ESD device is provided with between described driving circuit and touch-screen body.
Be connected with in turn high frequency attenuation unit and transient voltage between touch-screen body and driving circuit suppress unit, and described transient voltage suppresses unit through charge discharging resisting unit ground connection.
The input signal of described isolated location comprises control signal that touch-screen driver element exports, data-signal and power supply AVCC, in analog AGND, and output signal comprises the control signal after isolation, data-signal and power supply VCC, digitally GND.
Described isolated location is 4 passage high-speed figure isolating chips of charged isolation.
Resistive touch screen antistatic circuit of the present invention comprises an isolated location, by isolated location, the ground level of the ground level of touch-screen sample circuit and control circuit is kept apart, other coherent signal entering touch-screen control chip is also isolated simultaneously, prevent the interference on the interference of mimic channel ground level and signal wire from entering control circuit, affect the stability of whole system.This circuit has the advantages such as electrostatic defending grade is high, circuit structure is simple, cost is low, volume is little, effectively can eliminate the impact of electrostatic on resistive touch screen, make driving circuit work more stable, touch-screen longer service life.
Accompanying drawing explanation
Fig. 1 is touch-screen anti-static system block diagram;
Fig. 2 is high frequency attenuation unit schematic diagram;
Fig. 3 is that transient voltage suppresses unit schematic diagram;
Fig. 4 is charge discharging resisting unit schematic diagram;
Fig. 5 is isolated location schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described further.
Resistive touch screen antistatic circuit embodiment
The resistive touch screen antistatic circuit of the present embodiment comprises isolated location, and described isolated location is arranged between driving circuit and touch screen control circuit.
In order to make antistatic circuit be applicable to the higher occasion of electrostatic defending class requirement further, on the basis that isolated location is set, between driving circuit and touch-screen body, be provided with ESD device.
Certainly, also above-mentioned ESD device can be replaced with high frequency attenuation unit, transient voltage suppresses unit and charge discharging resisting unit, as shown in Figure 1, the input signal of described high frequency attenuation unit comprises the negative pole (Y-) of positive pole (X+), the negative pole (X-) of touch pad X direction, the positive pole (Y+) of touch pad y direction and the touch pad y direction being connected to touch pad X direction to concrete antistatic circuit schematic diagram; Output signal is respectively X1+, X1-, Y1+, Y1-, is connected to input signal X1+, X1-, Y1+, Y1-position that voltage suppresses unit respectively; Described transient voltage suppresses the output signal of unit to comprise X2+, X2-, Y2+, Y2-and public connecting end (COM); Described transient voltage suppresses the output signal public connecting end (COM) of unit to be connected to the input end of charge discharging resisting unit, output termination the earth (PE) of described charge discharging resisting unit; The input signal of described isolated location comprises control signal that touch-screen driver element exports, data-signal and power supply AVCC, in analog AGND, and output signal comprises the control signal after isolation, data-signal and power supply VCC, digitally GND;
For the visible patent document of concrete composition structure and working principle " a kind of electrostatic discharge protection circuit of resistive touch screen " of high frequency attenuation unit, transient voltage suppression unit and charge discharging resisting unit, no longer describe in detail here.
Be illustrated in figure 5 the schematic diagram of embodiment isolated location, as seen from the figure, isolated location is made up of isolating chip U1, and isolating chip is a photoelectric isolated chip.4 control signals that 4 data channel of isolating chip side export with touch-screen driving chip are respectively connected with data-signal, the power supply connecting analog power supply AVCC of this side, ground connecting analog ground AGND; 4 control signals that 4 data channel of isolating chip opposite side export with control chip are respectively connected with data-signal, and this side power supply connects power supply VCC, and ground connects digitally GND.
The high-speed figure isolating chip of preferred 4 passages of charged isolation of isolated location U1 in the present embodiment, isolation voltage 2.5kV, can support the data rate of the highest 150Mbps.
Above-mentioned high-speed figure isolating chip adopts the isolation of magnetic coupling numeral, and the simulating signal that touch-screen exports is converted to after digital signal through driving circuit, isolates via this isolating chip.Compared with analog isolation mode, this digital isolated location can be kept apart the ground level of the ground level of touch-screen sample circuit and control circuit, other coherent signal entering touch-screen control chip is also isolated simultaneously, prevent the interference on the interference of mimic channel ground level and signal wire from entering control circuit, affect the stability of whole system, and circuit structure is simple, and cost is low.
Compared with traditional Phototube Coupling mode, the magnetic coupling isolation of the present embodiment has more high-grade high_voltage isolation performance, also there is outstanding static discharge (ESD) performance simultaneously, the esd event exceeding higher level can be tackled, during the esd event of finite energy, isolating device self can absorb and discharge some electric charges.
Certainly, as other embodiments, isolated location also can select the isolating device such as traditional photoelectric isolated chip, Capacitor apart chip.
The principle of work of the present embodiment circuit is as follows: when electrostatic pulse enters resistive touch screen electrostatic discharge protection circuit of the present invention from resistive touch screen winding displacement, first through high frequency attenuation unit, high frequency attenuation unit can make the high fdrequency component in electric signal obtain decay to a certain extent; Electric signal enters transient voltage suppression unit through high frequency attenuation unit afterwards, and transient voltage suppresses unit that the superpotential in signal is carried out clamper; And charge discharging resisting unit can absorb electrostatic charge and slow vent discharge lotus fast.Isolated location keeps apart the ground level of the ground level of touch-screen sample circuit and control circuit, other coherent signal entering touch-screen control chip is also isolated simultaneously, prevent the interference on the interference of mimic channel ground level and signal wire from entering control circuit, affect the stability of whole system.
Resistive touch screen embodiment
The resistive touch screen of the present embodiment comprises touch-screen body and touch screen control circuit, between touch-screen body and touch screen control circuit, comprise antistatic circuit, and described antistatic circuit is above-mentioned resistive touch screen antistatic circuit, introduces no longer in detail here.
Above embodiment only understands core concept of the present invention for helping; the present invention can not be limited with this; for those skilled in the art; every according to thought of the present invention; the present invention is modified or equivalent replacement; any change done in specific embodiments and applications, all should be included within protection scope of the present invention.
Claims (10)
1. a resistive touch screen antistatic circuit, is characterized in that, this circuit comprises isolated location, and described isolated location is arranged between driving circuit and touch screen control circuit.
2. a kind of resistive touch screen antistatic circuit according to claim 1, is characterized in that, between described driving circuit and touch-screen body, be provided with ESD device.
3. a kind of resistive touch screen antistatic circuit according to claim 1, it is characterized in that, between touch-screen body and driving circuit, be connected with high frequency attenuation unit and transient voltage suppression unit in turn, described transient voltage suppresses unit through charge discharging resisting unit ground connection.
4. a kind of resistive touch screen antistatic circuit according to claim 1, it is characterized in that, the input signal of described isolated location comprises control signal that touch-screen driver element exports, data-signal and power supply AVCC, in analog AGND, and output signal comprises the control signal after isolation, data-signal and power supply VCC, digitally GND.
5. a kind of resistive touch screen antistatic circuit according to claim 3, is characterized in that, described isolated location is 4 passage high-speed figure isolating chips of charged isolation.
6. a resistive touch screen, this touch-screen comprises touch-screen body and touch screen control circuit, antistatic circuit is comprised between touch-screen body and touch screen control circuit, it is characterized in that, described antistatic circuit comprises isolated location, and described isolated location is arranged between driving circuit and touch screen control circuit.
7. a kind of resistive touch screen according to claim 6, is characterized in that, between described driving circuit and touch-screen body, be provided with ESD device.
8. a kind of resistive touch screen according to claim 6, it is characterized in that, be connected with in turn high frequency attenuation unit and transient voltage between touch-screen body and driving circuit suppress unit, and described transient voltage suppresses unit through charge discharging resisting unit ground connection.
9. a kind of resistive touch screen according to claim 6, it is characterized in that, the input signal of described isolated location comprises control signal that touch-screen driver element exports, data-signal and power supply AVCC, in analog AGND, and output signal comprises the control signal after isolation, data-signal and power supply VCC, digitally GND.
10. a kind of resistive touch screen according to claim 8, is characterized in that, described isolated location is 4 passage high-speed figure isolating chips of charged isolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510556486.1A CN105204706A (en) | 2015-09-02 | 2015-09-02 | Antistatic circuit for resistive touch screen and resistive touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510556486.1A CN105204706A (en) | 2015-09-02 | 2015-09-02 | Antistatic circuit for resistive touch screen and resistive touch screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105204706A true CN105204706A (en) | 2015-12-30 |
Family
ID=54952432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510556486.1A Pending CN105204706A (en) | 2015-09-02 | 2015-09-02 | Antistatic circuit for resistive touch screen and resistive touch screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105204706A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099892A (en) * | 2016-08-12 | 2016-11-09 | 京东方科技集团股份有限公司 | Static release protection circuit and comprise its array base palte, display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130002606A1 (en) * | 2011-09-08 | 2013-01-03 | Mann John C | Stylus and stylus circuitry for capacitive touch screens |
| CN103226534A (en) * | 2013-03-29 | 2013-07-31 | 北京工业大学 | Isolated type high-speed data acquisition card |
| CN104391617A (en) * | 2014-11-05 | 2015-03-04 | 许继电气股份有限公司 | Static protection circuit for resistance touch screen |
-
2015
- 2015-09-02 CN CN201510556486.1A patent/CN105204706A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130002606A1 (en) * | 2011-09-08 | 2013-01-03 | Mann John C | Stylus and stylus circuitry for capacitive touch screens |
| CN103226534A (en) * | 2013-03-29 | 2013-07-31 | 北京工业大学 | Isolated type high-speed data acquisition card |
| CN104391617A (en) * | 2014-11-05 | 2015-03-04 | 许继电气股份有限公司 | Static protection circuit for resistance touch screen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099892A (en) * | 2016-08-12 | 2016-11-09 | 京东方科技集团股份有限公司 | Static release protection circuit and comprise its array base palte, display device |
| US10884303B2 (en) | 2016-08-12 | 2021-01-05 | Boe Technology Group Co., Ltd. | Transient overvoltage protection circuit, array substrate comprising the same, and display apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9496705B2 (en) | Protection circuit of communication interface | |
| CN102185698B (en) | Ethernet power supply port protective circuit and ethernet power supply equipment | |
| CN104360771A (en) | Touch control device capable of reinforcing static protection effect | |
| CN202034777U (en) | ESD (electrostatic discharge) protective circuit used for capacitive load | |
| CN101442046B (en) | Dynamic detection electrostatic protection circuit structure | |
| CN101162840A (en) | Interface protective circuit | |
| CN101872968A (en) | Protective circuit | |
| CN203774781U (en) | Signal interface high-power electromagnetic pulse protection device | |
| CN105204706A (en) | Antistatic circuit for resistive touch screen and resistive touch screen | |
| CN104391617B (en) | A kind of electrostatic discharge protection circuit of resistive touch screen | |
| CN204155239U (en) | A kind of anlistatig touch-screen module | |
| CN102280870A (en) | Switching circuit board and protection method thereof | |
| CN209299522U (en) | The detection circuit of the external car microphone of T-BOX, vehicle-mounted T-BOX | |
| CN106712753A (en) | Electrostatic protection circuit | |
| CN103036220A (en) | Electro spark detector (ESD) circuit protection structure | |
| CN202693002U (en) | Two-wire system transmitter and anti-jamming circuit thereof | |
| CN202474848U (en) | Intelligent lightning protection guard circuit | |
| CN213991086U (en) | Optical fiber transmitter driving circuit with electrostatic protection capability | |
| CN201766354U (en) | Power over Ethernet (POE) equipment and interface circuit thereof | |
| CN107017612A (en) | The protection against lightning surge circuit and its implementation of a kind of gigabit Ethernet mouthful | |
| CN103558447A (en) | Zero-voltage control circuit for small signals | |
| CN106655138A (en) | Surge protection circuit | |
| CN203480829U (en) | Analog audio signal self-check system | |
| CN207427553U (en) | A kind of electrostatic protection device | |
| CN202364110U (en) | High-voltage inversion protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151230 |