CN104063106A

CN104063106A - Anti-interference multipoint capacitance touch-control membrane system

Info

Publication number: CN104063106A
Application number: CN201410260089.5A
Authority: CN
Inventors: 王伟挺
Original assignee: SUZHOU TOUCH PLANET TECHNOLOGY Co Ltd
Current assignee: SUZHOU TOUCH PLANET TECHNOLOGY Co Ltd
Priority date: 2014-06-12
Filing date: 2014-06-12
Publication date: 2014-09-24

Abstract

The invention discloses an anti-interference multipoint capacitance touch-control membrane system which comprises a multipoint capacitance touch-control membrane and a measuring circuit board, wherein the multipoint capacitance touch-control membrane is connected with the measuring circuit board through a flexible printed circuit board; the measuring circuit board is connected with a computer through a USB (Universal Serial Bus) line; two layers of PET membranes are arranged as the substrates of the multipoint capacitance touch-control membrane; a plurality of nanometer leads are uniformly distributed between the two layers of PET membranes along X and Y directions; the measuring circuit board is composed of a high-precision measuring module, a measuring module shielding shell, a high-speed USB module and a USB power filtering module. The anti-interference multipoint capacitance touch-control membrane system has the characteristics of multipoint touch control, strong anti-interference property, strong instantaneity, high communication rate, and the like.

Description

A kind of anti-interference multiple spot capacitance touching control film system

Technical field

Patent of the present invention relates to a kind of anti-interference multiple spot capacitance touching control film system, belongs to computer hardware and software field, is specifically related to a kind of touch control film, metering circuit plate based on projection-type mutual capacitance technology.

Background technology

Existing projecting type capacitor touch control film is with respect to traditional touch screen, and touch control film uses fine nm-class conducting wire as capacitive transducer.Because the size of capacitance is directly proportional to the size of capacitance pole panel, and nm-class conducting wire is a pole-face plate of electric capacity, so capacitance is extremely faint, probably in 10pF left and right.The finger of human body is also a very faint electric capacity (capacitance is in pF level), and when the finger of human body is during near nm-class conducting wire, the electric capacity of finger will be superimposed on original capacitance of nm-class conducting wire.Nanometer touch film system is measures this capacitance, and the difference of the electric capacity by real-time measurement during without touch-control and while having touch-control, with accurate Calculation position of touch.

Because the capacitance of measuring is very faint, need accurate metering circuit module, be therefore easily subject to extraneous Electromagnetic Interference, metering circuit electric power system has high frequency interference conventionally in addition, also can have very large interference to it.

Owing to having adopted the technology of self-capacitance, so cannot realize multiple spot truly, so-called 2 points on market, also realize by upper strata algorithm now, inevitably have terrible point.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, proposed a kind of anti-interference multiple spot capacitance touching control film system.

The present invention includes multiple spot capacitance touching control film and metering circuit plate, multiple spot capacitance touching control film is connected with metering circuit plate by flexible PCB, and metering circuit plate connects computer by USB line.

Described multiple spot capacitance touching control film by two-layer PET film as base material, the equally distributed some nm-class conducting wires of directions X between two-layer PET film and Y-direction, wherein directions X nm-class conducting wire has the feature of square wave or just profound ripple, the nm-class conducting wire of Y-direction is linearly, and the nm-class conducting wire of all directions Xs and Y-direction is all finally connected on the FPC flexible PCB that is positioned at edge.

Described metering circuit plate is made up of high-acruracy survey module, measurement module shielding case, high speed USB module, USB power filtering module, the measured module shielding case of high-acruracy survey module closely surrounds, and form one shielding closure, the data line of high-acruracy survey module connects high speed USB module, the power lead of high-acruracy survey module connects USB power filtering module, the power supply of high speed USB module is all connected USB power filtering module with data line, and USB power filtering module is connected with computer by USB interface.

The useful effect that the present invention has compared with background technology is: designed new touch control film sensor placement figure, strengthened its performance aspect anti-interference, and can realize multi-point touch; In circuit design, adopt accurate measurement mutual capacitance circuit design, can more accurately measure faint mutual capacitance value; In circuit design, introduce filter circuit module, with the high frequency interference in filtering circuit electric power system, and can ensure that USB signal transmission is not affected by filtering circuit; On the circuit module of accurate measurement mutual capacitance that is subject to external interference (comprising crystal oscillator), add layer of metal shell, to shield outside electromagnetic interference; Choose high speed USB chip to meet the needs of the needed high speed mass data transmission of mutual capacitance technology.

Brief description of the drawings

Fig. 1 is anti-interference multiple spot capacitance touching control film system schema figure.

Fig. 2 is multiple spot capacitance touching control film schematic diagram.

Fig. 3 is the system module figure of metering circuit plate.

Embodiment

Be further described below in conjunction with accompanying drawing.

As shown in Figure 1, whole system comprises multiple spot capacitance touching control film 1 and metering circuit plate 2, and multiple spot capacitance touching control film 1 is by FPC(flexible PCB) be connected with metering circuit plate 2, metering circuit plate 2 connects computer 3 by USB line.

As shown in Figure 2, multiple spot capacitance touching control film by two-layer PET film as base material, the equally distributed some nm-class conducting wires of directions X between two-layer PET film and Y-direction, wherein directions X nm-class conducting wire has the feature of square wave or just profound ripple, the nm-class conducting wire of Y-direction is linearly, and the nm-class conducting wire of all directions Xs and Y-direction is all finally connected on the FPC flexible PCB that is positioned at edge.This graphic designs has certain noiseproof feature.

As shown in Figure 3, metering circuit plate 2 is made up of high-acruracy survey module shielding case, high speed USB module 2-3, USB power filtering module 2-2, the measured module shielding case of high-acruracy survey module closely surrounds, and form one shielding closure, and the data line of high-acruracy survey module connects high speed USB module, the power lead of high-acruracy survey module connects USB power filtering module, the power lead of high speed USB module is all connected the power filtering module by USB with data line, and USB power filtering module can connect USB interface 2-1 to be connected with computer.

Described computer adopts the computer with USB2.0 communication capacity, and operating system can be the mainstream operation systems such as Windows/Linux/Android/iOS.

The working method of apparatus of the present invention is: the nm-class conducting wire of directions X is as the emitting antenna transmitting, and the nm-class conducting wire of Y-direction is as the receiving antenna of acknowledge(ment) signal, and every nm-class conducting wire of directions X and Y-direction works alone.The N root wire of supposing directions X is XN, and the M root wire of Y-direction is YM.When scanning, can on XN, load the signal of a specific waveforms, and now scan the signal of YM to obtain receiving on it, when people's finger approaches or when the point of crossing of contact XN and YM line, the signal that now scanning obtains will be different from not signal value when touch-control of hand.The touch-control of finger detected with this.The joining of all directions Xs and Y-direction all will scan successively in a scanning frame, and frame data are transferred to the computer of host computer by high speed USB chip and USB connecting line, computer receives that USB frame data will process, to extract touch information, then convert movement or the click action of computer cursor to, reach with this function that manipulates computer.

Between high speed USB chip and USB interface, have a USB power-supply filter, not only, for the power supply of USB, also can carry out corresponding filtering for the data line of USB, the usefulness of disturbing to reach thorough filter out power.Metering circuit plate is powered by USB power supply, so all pins that need power supply must be all the power supplys through the filtering of USB power-supply filter when circuit design.

The performance index of native system are as follows:

(1) sampling rate maximum reaches: 125Hz;

(2) from the minor increment of liquid crystal display surface: 2mm;

(3) data-interface: USB2.0;

(4) maximum scan postpones: 8ms;

(5) back-up system Windows series, Linux series, Android, iOS etc.

Native system has multi-point touch, and antijamming capability is strong, real-time, and communication speed high can be widely used in the touch control device in various occasions.

In the protection domain of spirit of the present invention and claim, any amendment and change that the present invention is made, all fall into protection scope of the present invention.

Claims

1. an anti-interference multiple spot capacitance touching control film system, comprises multiple spot capacitance touching control film and metering circuit plate, it is characterized in that:

Multi-point touch film is connected with metering circuit plate by flexible PCB, and metering circuit plate connects computer by USB line;

Described multiple spot capacitance touching control film by two-layer PET film as base material, directions X and Y-direction between two-layer PET film are uniformly distributed some nm-class conducting wires, wherein directions X nm-class conducting wire is rectangular or sinusoidal wave wavy, the nm-class conducting wire of Y-direction is linearly, and the nm-class conducting wire of all directions Xs and Y-direction is all finally connected on the flexible PCB that is positioned at edge;

Described metering circuit plate is made up of high-acruracy survey module, measurement module shielding case, high speed USB module, USB power filtering module, the measured module shielding case of high-acruracy survey module closely surrounds, and form one shielding closure, the data line of high-acruracy survey module connects high speed USB module, the power lead of high-acruracy survey module connects USB power filtering module, power lead, the data line of high speed USB module all connect USB power filtering module, and USB power filtering module is connected with computer by USB interface.