CN202421350U

CN202421350U - Touch screen test circuit

Info

Publication number: CN202421350U
Application number: CN2011204807670U
Authority: CN
Inventors: 杨世光
Original assignee: DONGGUAN EVER ADVANCED TECHNOLOGY Ltd
Current assignee: DONGGUAN EVER ADVANCED TECHNOLOGY Ltd
Priority date: 2011-11-28
Filing date: 2011-11-28
Publication date: 2012-09-05
Anticipated expiration: 2021-11-28

Abstract

The utility model discloses a touch screen test circuit which comprises a frequency source, a plurality of parallelly-connected switch sets and a reference resistor, wherein the frequency source is sequentially connected in series with the plurality of parallelly-connected switch sets and the reference resistor so as to form a loop, and each switch set comprises two switches which are connected in series, and a test point is arranged between the two switches; and in the process of testing, a guide line is respectively led out from one test point and another test point adjacent to the one test point and is connected to one of capacitors of a to-be-tested touch screen. The circuit disclosed by the utility model can measure multiple capacitance values of a touch screen in one time; and the circuit is simple, easy in wire connection, and beneficial to production.

Description

The testing touch screen circuit

Technical field

The utility model relates to touch-screen detection range technology, refers in particular to the test circuit that a kind of disposable energy measurement goes out a plurality of electric capacity of touch-screen.

Background technology

At present, touch-screen has been widely used on the electronic products such as high-end mobile phone, panel computer, on instrument and equipment that a part of factory uses and home-use electric equipment, has also used touch-screen more and more.

Touch-screen is a kind of up-to-date input equipment, is the simplest in numerous input equipments, most convenient, the most natural, the input equipment that is best suited for Chinese multimedia information inquiry national conditions.That touch-screen has is sturdy and durable, reaction velocity fast, save the space, be easy to many advantages such as interchange.Utilize touch-screen, the user only need just can realize the operation to main frame with icon or literal that finger refers to bump on the display screen lightly, thereby makes man-machine interaction more simple and direct, greatly facilitates the user that those are ignorant of computation.Touch-screen brings the new people mutual mode of delivering personally, and gives multimedia with brand-new looks, is extremely attractive brand-new multimedia interactive equipment.

Touch-screen is boundless in the range of application of China, mainly contains the inquiry of public information, like the service inquiry of departments such as telecommunication bureau, the tax bureau, bank, electric power; The information inquiry that the city street does not have; Can be widely used in leading office, Industry Control, military commanding, electronic game, choosing song or selecting dish, multimedia teaching, real estate presell etc. in addition.Along with the city is developed and computer network infiltration in daily life to information-based direction, information inquiry all can occur with the tangibly form of touch-screen-displaying contents, has brought great challenge for touch-screen film producer's detection for this reason.

The disposable capacitance that can only measure an electric capacity on the touch-screen of traditional touch screen testing circuit, because the electric capacity of touch-screen has a lot, so a slice touch-screen needs repeatedly to test, and takes time and effort very much, brings very big worry to the manufacturer.

The utility model content

In view of this, the utility model is to the disappearance of prior art existence, and its fundamental purpose provides a kind of testing touch screen circuit, and it can disposablely measure a plurality of capacitances on the touch-screen, and circuit is simple, and line is easy, helps producing.

For realizing above-mentioned purpose, the utility model adopts following technical scheme:

A kind of testing touch screen circuit; The switches set and the reference resistance that comprise frequency source, a plurality of parallel connections; Connect successively switches set and the reference resistance of these a plurality of parallel connections of said frequency source forms the loop; And each switches set comprises the switch of two polyphones, is provided with a test point between these two switches; During test, wherein a test point and another adjacent test point are drawn lead respectively and are connected on one of them electric capacity of touch-screen to be measured.

The utility model compared with prior art has tangible advantage and beneficial effect; Particularly; Can be known that by technique scheme it mainly is through a plurality of switches set are set on same circuit simultaneously, adjacent two switches set cooperate the magnitude of voltage of an electric capacity on the corresponding senses touch screen; And, make capacitance on the touch-screen through simply calculating through the magnitude of voltage of reference resistance and test reference resistance is set.The circuit of the utility model has greatly been simplified the huge test macro of traditional test circuit, and circuit is simple, and is easy to connect, can a plurality of capacitances of disposable measurement, avoided the repeatedly trouble of repetitive operation.

Be architectural feature and the effect of more clearly setting forth the utility model, come the utility model is elaborated below in conjunction with accompanying drawing and specific embodiment.

Description of drawings

Fig. 1 is the circuit diagram of the preferred embodiment of the utility model;

Fig. 2 is the circuit diagram during test in the preferred embodiment of the utility model.

The accompanying drawing identifier declaration:

10, switches set 10-1, first switches set

10-2, second switch group 10-x, x switches set.

Embodiment

Please referring to figs. 1 through shown in; It has demonstrated the concrete structure of the preferred embodiment of the utility model; This testing touch screen circuit comprises frequency source, ground connection behind series connected switches Kx, switch S x, the reference resistance Rf successively on the frequency source; Form the loop, wherein this K switch x, switch S x form switches set 10-x.Test circuit also comprises a plurality of switches set 10 simultaneously, and each switches set all is to be in series by two switches, and is as shown in Figure 1, and K switch 1 is the first switches set 10-1 with switch S 1, and wherein the tie point between K switch 1 and the switch S 1 is test point P1.K switch 2 is second switch group 10-2 with S2, and K switch 2 is test point P2 with switch S 2 tie points ... The quantity of switches set 10 is decided according to the actual requirements.All switches set 10 all with switches set 10-x (being K switch x and switch S x) and downlink connection, and above-mentioned K switch x and Sx are regular tap.In actual application, all draw a lead on this test point P1 and the test point P2 and be connected to the detector probe that is used for the contact measured touch-screen.

As shown in Figure 2, in the test process, Closing Switch K1 and switch S 1, frequency source is seen frequency f off, reads the magnitude of voltage Vr of reference resistance.Cut-off switch S1 then inserts the capacitor C 1 of touch-screen to be measured between test point P1 and P2, closed again S2, and electric current forms the loop through K switch 1, capacitor C 1, switch S 2 and reference resistance Rf, the magnitude of voltage V1 of record C1.Compare V1 and Vr, because V1/Vr=Rf/ (1/ (2* ∏ * f*C1)), thus C1=Vr/ (V1* Rf*2* ∏ * f), thus calculate the capacitance C1 of touch-screen.

If will measure the capacitance of touch-screen simultaneously; Only need first switch of one of them switches set of closed adjacent switch group and second switch of another switches set simultaneously; Can measure the magnitude of voltage of C1 to CX simultaneously, and calculate the capacitance of each electric capacity through formula.

In sum; The design focal point of the utility model is; It mainly is through a plurality of switches set are set on same circuit simultaneously; Adjacent two switches set cooperate the magnitude of voltage of an electric capacity on the corresponding senses touch screen, and through the magnitude of voltage of reference resistance and test reference resistance is set, and make capacitance on the touch-screen through simply calculating.The circuit of the utility model has greatly been simplified the huge test macro of traditional test circuit, and circuit is simple, and is easy to connect, can a plurality of capacitances of disposable measurement, avoided the repeatedly trouble of repetitive operation.

The above; It only is the preferred embodiment of the utility model; Be not that the technical scope of the utility model is done any restriction; So every technical spirit according to the utility model all still belongs in the scope of the utility model technical scheme any trickle modification, equivalent variations and modification that above embodiment did.

Claims

1. testing touch screen circuit; It is characterized in that: the switches set and the reference resistance that comprise frequency source, a plurality of parallel connections; Connect successively switches set and the reference resistance of these a plurality of parallel connections of said frequency source forms the loop; And each switches set comprises the switch of two polyphones, is provided with a test point between these two switches; During test, wherein a test point and another adjacent test point are drawn lead respectively and are connected on one of them electric capacity of touch-screen to be measured.