The upper and lower electrode conduction structure of touch screen
Technical field
The present invention relates to the touch screen technology, especially the upper and lower electrode conduction structure of a kind of touch screen, refer in particular to the coupling arrangement of its electrode network of resistance (pressure) formula touch screen, and a kind of anisotropic conductive is as the syndeton of winding displacement and its electrode network of touch screen, processing procedure is significantly reduced, can obtain more stable conducting effect simultaneously again.
Background technology
According to prior art, to shown in Figure 9, be typical four-wire ohm (pressure) formula touch screen as Fig. 6, its primary structure comprises:
One glass substrate A, its surperficial inside casing printing layer of conductive film A1 (calling the ITO layer in the following text), and make the rim all around of substrate A not be printed the ITO layer;
One linear pattern B is the mode of printing of conductive silver slurry layer with thin shape, is printed in the rim all around (promptly not being printed the ITO layer partly) of glass substrate A;
One site layer G is distributed on the surface of conductive film A1;
One insulation course C is printed on the linear pattern B;
One plural number silver slurry line D is printed on the insulation course C; Above structure forms lower electrode plate;
One its bottom surface of film E is printed with conductive film (ITO layer) E1;
One insulation course F be printed in its ITO layer of film E E1 around, and make insulation course F side form breach F1;
One plural number silver slurry line D2 is printed on the basal surface of insulation course F and constitutes electric pole plate;
The point of contact of its front end of one winding displacement (tail) T is connected in the four line input end D1 of silver slurry line D.
At above-mentioned known touch screen, its upper electrode is made of the silver slurry line D2 that is positioned at insulation course F surface, and lower electrode is constituted by being positioned at the lip-deep silver slurry of insulation course C line D, and the conducting of upper and lower electrode is necessary to constitute resistor network.
The wherein conducting of upper and lower electrode is on the line surface with silver slurry line D2, and the silver paste points D4 of plural number is arranged on the point; Make silver slurry line D, the D2 of upper and lower layer can conducting, form resistor network by the connection of silver paste points D4.
The upper and lower layer silver of the binding of above-mentioned silver paste points slurry line D, D2, its shortcoming is:
(1) the some solation journey of silver paste points D4 increases cost.
(2) silver paste points D4 need be dried just conductive effect, and contact point does not stick together silver paste points D4 if dry then before the combination, easily because of environment or the upper and lower layer of external force variation generation electrode loose contact.
(3) if just oven dry after the upper and lower combination of electrodes, then the elargol solvent is not volatile, it is bad easily to produce electrode conduction, if with heated drying, the no-solvent type silver paste points is done the connection of upper and lower electrode, also be very easy to make film E (the being ITO Film) distortion on upper strata, cause the disappearance of outward appearance and function because of drying course.
(4) some glue amount uniformity coefficient is wayward, and during if any error, it is bad to form conduction easily.
Summary of the invention
To sum up, how overcoming above-mentioned disappearance is the problem that the present invention desires to overcome.
Therefore, fundamental purpose of the present invention, providing a kind of touch screen upper and lower electrode conduction structure, the silver paste points of can forgoing fully, the flow process of some glue, and change with binding and the conductiving point of anisotropic conductive (ANISOTROPICCONDUCTIVE FILM calls ACF in the following text) as upper and lower electrode and winding displacement, reduce to reach work flow, upper and lower interelectrode conduction is more accurate simultaneously, and unexpected have loose contact or topmost thin film to be out of shape.
For reaching above-mentioned purpose, the upper and lower electrode conduction structure of a kind of touch screen comprises according to structure:
One touch screen, its resistor network is divided into lower electrode line, upper electrode line and winding displacement and is constituted, and wherein on the output terminal appropriate location of the electrical lead more than at least one in winding displacement, is provided with perforation, and this touch screen is resistance or voltage-type;
One anisotropic conductive is filled in the perforation and hot pressing is attached in the input end of upper and lower layer electrode wires, as upper and lower layer electrode conduction media, the electrical lead of winding displacement and upper and lower layer electrode wires is conducted.
The upper and lower electrode conduction structure of touch screen of the present invention, work flow shortens, cost is low, and upper and lower interelectrode conduction is more accurate simultaneously, can not come in contact fault bad or the topmost thin film distortion.
Description of drawings
Fig. 1 is the three-dimensional exploded view of touch screen of the present invention;
Fig. 2 is the plan view of the upper and lower battery lead plate of the present invention;
Fig. 3 is the preceding sectional drawing of the upper and lower battery lead plate combination of the present invention;
Fig. 4 is the sectional drawing after winding displacement of the present invention links with upper and lower electrode wires and winding displacement;
Fig. 5 links the section amplification figure of conducting for winding displacement of the present invention and bottom electrode line;
Fig. 6 is the three-dimensional exploded view of known resistance (pressure) formula touch screen;
Fig. 7 is the planimetric map of known upper and lower layer electrode;
Fig. 8 is the action sectional drawing before known upper and lower layer electrode fitted;
Fig. 9 is the action sectional drawing after known upper and lower layer electrode fitted.
Embodiment
At first see also Fig. 1 to Fig. 4, the present invention comprises according to structure:
One resistance (pressure) formula touch screen 10, its resistor network, divide into upper electrode line (silver slurry line) 12, lower electrode line 22 and winding displacement 30 and constitute, wherein on the output terminal appropriate location of the electrical lead more than at least one in winding displacement 30 31,33, be provided with perforation 311,331;
One anisotropic conductive (ACF) 50 is filled in the perforation 311,331 and hot pressing is attached among input end 12a, the 12b, 221,223 of upper and lower layer electrode wires 12,22, as upper and lower layer electrode conduction media, the electrical lead 31,33 of winding displacement 30 and upper and lower layer electrode wires 12,22 are conducted.
According to aforesaid principal character, wherein the output terminal 321,341 of two electrical leads 32,34 in addition of winding displacement 30 only mat conducting resinl 52 overlay mutually with the input end 222,224 of lower electrode line and close, with make two electrical leads 32,34 can with two electrode wires, 12 conductings on upper strata.
According to aforesaid principal character, wherein upper electrode line 12 is with mode of printing, be printed in the basal surface of insulation course 23, the last insulation course 23 that is shaped as frame is printed in again around the basal surface of upper film 20 (Film), the basal surface of upper film (Film) 20 (promptly going up the central surface that insulation course 23 is separated), be printed with conductive film (ITO layer) 72, lower electrode line 22 is printed in following insulation course 11 upper surfaces that are the frame shape, following insulation course 11 is printed in the surface of the linear design layer 9 of rectangular frame shape, and linear design layer 9 republishes on rim around the surface of lower substrate 7; One conductive film 8 is printed in the surface (being the central surface that linear design layer 9 is separated) of lower substrate 7, and one is distributed on the conductive film (ITO layer) 8 by the site layer 6 that plural insulating particle constituted.
According to aforesaid principal character, wherein upper and lower 12,22 of electrode wires of layer are printed with a layer insulating 19, these insulation course 19 lateral margins are provided with a breach 191, this breach 191 is just kept supplying, input end 12a, the 12b, 221,223 of lower electrode line 12,22 are positioned at this breach 191 positions, be able to link input end 12a, 12b, 221,223 and the link of winding displacement 30 its electrical leads 31,33 for anisotropic conductive (ACF), shown in figure five in this position.
Want feature according to aforesaid primary and secondary, when implementing, have following superior effect and embodiment:
(1) anisotropic conductive (ANISOTROPIC CONDUCTIVE FILM calls ACF in the following text) 50 mixed powerful viscose glue by the complex conduction granule and formed the characteristic with upper and lower conducting; Winding displacement (FPCTail) 30 inside are printed with plural number (four) electrical lead 31 of silver slurry (or copper) material, 32,33,34, get wherein two electrical leads 31,33 electric output terminal punching in advance, make and have two perforation 311,331, as shown in Figure 2, anisotropic conductive 50 fill in and hot pressing in the perforation 311, in 331 and on, lower electrode line 12,22 two electrical inputs 221 wherein, 223,12a, among the 12b, make two electrical leads 31 of winding displacement (Tail) 30,33 with last, lower electrode line 12,22 input end 221,223,12a, 12b is conducted, as shown in Figure 5.In addition the electric output terminal 321,341 of in addition two electrical leads, 32,34 its bottom surfaces of winding displacement 30 also nationality conducting resinl 52 press on the two electrode wires input ends 222,224 in addition that fit in lower electrode line 22, and make the electrical lead 32,34 in the winding displacement 30 be connected conducting with two electrode wires input ends 222,224 of lower floor, constitute a resistor network to make upper and lower layer electrode wires 12,22.This moment, one great effect was reached, that is: utilize electrical lead 31 in the winding displacement 30,33 punching in advance and filling hot pressing anisotropic conductive 50, conducting resinl 50 is formed, the conducting connecting structure of lower electrode, further can get rid of known last, the silver paste points hot pressing processing procedure of doing on the lower electrode line, so this case will effectively reduce at the processing procedure cost, on, conduction between bottom electrode is more accurate, do not have loose contact or consider the problem that upper film (Film) is out of shape, winding displacement 30 itself and conducting resinl 50 and on, bottom electrode line 22,12 when doing hot pressing, can can not become to making conductive film (ITO layer) distortion as the gummed of prior art silver paste points.This case hot pressing position is restricted to the position of winding displacement 30 its output terminals, therefore can avoid conductive film 72 problem on deformation.
(2) other linear pattern 9 is constituted by the conductive silver paste thin layer of shaped as frame, it is printed in around the surface of lower substrate 7, lower substrate 7 is constituted by the glass or the flexual clear plastic base material of transparent (or being tending towards transparent), four ends of linear pattern 9 be connected with four jiaos of ends that are connected in lower electrode line 12 (being conducted), to constitute the resistor network of contact, improve touch screen by the accuracy of touch-control to reach.
(3) with regard on the principle of work, though the feature of non-this case demand is convenient duty auditor's examination, the spy is summarized as follows:
When the exhausted utensil of edge touches touch screen 10, the conductive film 72 on upper strata is subjected to contact (ITO layer) to touch the conductive film 8 (ITO layer) of lower floor via the site layer 6 that insulated particle constituted, to measure the reference voltage level of this point, this magnitude of voltage ratio, promptly represent the ratio of X axis position on touch screen 10, lower conductive film 8 is used for measuring upper strata touch point voltage reference value, to measure the position of another Y direction, X, Y-axis is to the reference voltage level of ratio, handle and interpretation via another controller, and the central controller (CPU) that the signal after will handling transfers in the system is done the interpretation processing again, and variable signal manifested by lower substrate 7, so can directly doing on upper film 20, the user writes, draw or click every function.To sum up, this pattern characteristics can effectively reduce the work flow of voltage-type touch screen in the improvement of the syndeton of upper and lower electrode wires 12,22 and winding displacement 30 after the improvement really, and makes upper and lower interelectrode conduction more accurate.The effect that its feature reached, hardheaded already reaching, the applicant offers application in the whence in accordance with the law.