CN202815800U

CN202815800U - Capacitive touch screen

Info

Publication number: CN202815800U
Application number: CN201220444001.1U
Authority: CN
Inventors: 杨盛际; 王海生; 刘英明
Original assignee: Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-03-20
Anticipated expiration: 2022-08-31

Abstract

The utility model discloses a capacitive touch screen. The capacitive touch screen comprises a first electrode which is arranged on a baseplate and a second electrode which is intersected with the first electrode, wherein the first electrode comprises an electrode part and a metal bridge with bridge sharp angles, the electrode part is disconnected at the intersection part of the first electrode and the second electrode and is in insulation lap joint on the disconnection part through an insulation island, and a metal island is positioned on the surface of the insulation island and connects the disconnected electrode part; and the second electrode and the electrode part of the first electrode are positioned on a same layer surface, and electrode sharp angles which are arranged in different layer surfaces in the way of being opposite to the bridge sharp angles are arranged on the second electrode. According to a point discharge principle, when electrostatic charges are accumulated on the first electrode, the charges are discharged onto the second electrode through the bridge sharp angles and the electrode sharp angles, so that the metal bridge is prevented from being broken due to electrostatic breakdown, and the product percent of pass is greatly increased.

Description

A kind of capacitive touch screen

Technical field

The utility model relates to touch screen technology, particularly relates to a kind of capacitive touch screen.

Background technology

Touch-screen is as a kind of input medium, than keyboard and mouse, for the user provides better convenience.According to different realization principles, touch-screen can be divided into resistance-type, condenser type, surface acoustic wave type, infrared type etc.

Capacitive touch screen is particulate metal conductive materials that sticks layer of transparent at glass surface.When finger touch, can the electric field of touch screen surface be exerted an influence, its result has been equivalent to cause the change of electric capacity, system is by determining the position of contact to the detection of voltage, capacitance variations, and then complete operation.

As depicted in figs. 1 and 2, existing capacitive touch screen generally includes and is arranged on the driving transparency electrode 21 of intersecting on the substrate 10 and putting and surveys transparency electrode 27, and wherein, the electrode part 23 that drives transparency electrode 21 has interruption at infall; Discontinuities at electrode part 23 is coated with insulation island 24, and insulation is formed with metal bridge 26 on the island 24, and electrode part 23 can connect by metal bridge 26 conductions in discontinuities.

In existing capacitive touch screen, the sheet resistance of transparency electrode is much larger than the sheet resistance of metal bridge.Therefore, in the production and transportation of touch-screen, the static that the actions such as friction, stickily tear diaphragm produce or contact high electrostatic charge object and the static that depends on very easily punctures metal bridge produces broken string, finally causes product defects.

The utility model content

The purpose of this utility model provides a kind of capacitive touch screen, exists metal bridge easily breakdown in the prior art in order to solve, and produces broken string, thereby causes the technical matters of product defects.

The capacitive touch screen that the utility model provides comprises: be arranged on the first electrode on the substrate, the second electrode of putting with the first electrode crossing, wherein,

Described the first electrode comprises electrode part and has the metal bridge of bridge wedge angle, described electrode part the infall of the first electrode and the second electrode have be interrupted and in discontinuities by insulation island insulation lapping, described metal bridge is positioned at surface, insulation island and the electrode part that is interrupted is connected;

The electrode area of described the second electrode and the first electrode has relative with the bridge wedge angle in different aspects and electrode wedge angle that put on same aspect.

Wherein, described electrode wedge angle and the bridge wedge angle of relatively putting comprises two pairs at least.

Wherein, described metal bridge has pierced pattern over against the part of the second electrode.

Wherein, entity part is X-shaped in the described pierced pattern.

Preferably, described the first electrode is for driving transparency electrode, and described the second electrode is for surveying transparency electrode.

In the capacitive touch screen that the utility model provides, because the second electrode has the electrode wedge angle, metal bridge has the bridge wedge angle that is oppositely arranged with the electrode wedge angle in different aspects, according to the point discharge principle, when having gathered electrostatic charge on the first electrode, to be discharged into electric charge on the second electrode from bridge wedge angle and electrode sharp corner, avoid because the metal bridge broken string that electrostatic breakdown produces has improved product percent of pass greatly.

Description of drawings

Fig. 1 is existing capacitive touch screen planar structure synoptic diagram;

Fig. 2 is the sectional view at existing capacitive touch screen electrode crossing place;

The capacitive touch screen electrode crossing place vertical view that Fig. 3 provides for the utility model;

The capacitive touch screen electrode crossing place electrode wedge angle that Fig. 4 provides for the utility model and the sectional view of bridge wedge angle;

The capacitive touch screen electrode crossing place electrode wedge angle that Fig. 5 provides for the utility model and the vertical view of bridge wedge angle;

The capacitive touch screen that Fig. 6 provides for the utility model is at the electrode part that forms the first electrode and the vertical view behind the second electrode;

The vertical view of capacitive touch screen after forming the insulation island that Fig. 7 provides for the utility model.

Description of reference numerals:

Embodiment

To have the easy breakdown generation broken string of metal bridge in the prior art in order solving, thereby to cause the technical matters of product defects, the utility model provides a kind of capacitive touch screen.

To shown in Figure 5, the capacitive touch screen that the utility model provides comprises such as Fig. 3: be arranged on the first electrode 11 on the substrate 10, intersect with the first electrode 11 and the second electrode 17 of putting, wherein,

Described the first electrode 11 comprises electrode part 13 and has the metal bridge 16 of bridge wedge angle 15, described electrode part 13 the infall of the first electrode 11 and the second electrode 17 have be interrupted and in discontinuities by insulation island 14 insulation lappings, described metal bridge 16 is positioned at 14 surfaces, insulation island and the electrode part 13 that is interrupted is connected;

The electrode part 13 of described the second electrode 17 and the first electrode 11 is positioned on the same aspect, has in different aspects relative with bridge wedge angle 15 and puts the electrode wedge angle 12 of (being that wedge angle is to wedge angle).

Because the second electrode 17 has electrode wedge angle 12, metal bridge 16 has the bridge wedge angle 15 that is oppositely arranged with electrode wedge angle 12 in different aspects, (point discharge is under the highfield effect according to the point discharge principle, a kind of electric discharge phenomena that the object sharp parts occurs), when having gathered electrostatic charge on the first electrode 11, to be discharged into electric charge on the second electrode 17 from bridge wedge angle 15 and electrode wedge angle 12, avoid because the metal bridge broken string that electrostatic breakdown produces has improved product percent of pass greatly.

The first electrode 11 can be for driving transparency electrode, then the second electrode 17 is for surveying transparency electrode, and perhaps, the first electrode 11 is for surveying transparency electrode, then the second electrode 17 is for driving transparency electrode, and the electrode part 13 of the first electrode 11 and the material of the second electrode 17 are generally tin indium oxide (ITO).As shown in Figure 3, preferably, the first electrode 11 is for driving transparency electrode, and the second electrode 17 is for surveying transparency electrode, this be because the resistance that drives transparency electrode often greater than the resistance of surveying transparency electrode, metal bridge 16 connects the electrode part that drives transparency electrodes and is conducive to reduce resistance.

Preferably, electrode wedge angle 12 and the bridge wedge angle 15 relatively put are at least two pairs, and the many places point discharge can be discharged into electrostatic charge on the second electrode more rapidly, and, when wherein pair of electrodes wedge angle and bridge wedge angle were breakdown, in addition several played a role to continuing; In principle, electrode wedge angle and the bridge wedge angle logarithm relatively put are better, and in the embodiment shown in fig. 3, the electrode wedge angle 12a～12h and the bridge wedge angle 15a～15h that relatively put are eight pairs.

Please continue with reference to figure 3, metal bridge 16 has pierced pattern over against the part of the second electrode 17.This is greatly favourable to mutual capacitance type touch screen, because compare with plate-shape metal bridge of the prior art, pierced pattern can reduce the first electrode 11 and the second electrode 17 infalls over against area, thereby reduce the time-delay over against coupling capacitance and resistance capacitance of infall, greatly improve signal to noise ratio (S/N ratio), strengthened touch-control sensitivity.The material of metal bridge is preferably molybdenum (Mo).

In Fig. 3, the entity part of metal bridge 16 pierced patterns is X-shaped, the afterbody of the four strip metal branches of " X " has respectively a bridge wedge angle 15a～15d is arranged, four angles of the four strip metal branches of " X " have respectively a bridge wedge angle 15e～15h, therefore, totally eight bridge wedge angles, eight electrode wedge angle 12a～12h on the second electrode are relative with these eight bridge wedge angle 15a～15h and put respectively.Because this metal bridge 16 has six metal line, can prevent from having guaranteed greatly the connectivity of metal bridge because the metal bridge that defective workmanship causes breaks; In addition, in contrast to prior art, the design can effectively improve optical match, and the efficient that sees through backlight is improved, and metal bridge also is difficult for directly being observed on the screen overall appearance, has improved visual effect.

The manufacture method of the capacitive touch screen that the utility model provides when the first electrode 11 of putting forming intersection and the second electrode 17, comprises that step is as follows:

As shown in Figure 6, form electrode part 13 and second electrode 17 of the first electrode 11 at substrate 10, wherein, described electrode part 13 has interruption, and described the second electrode 17 has electrode wedge angle 12, and intersects with electrode part 13 and put in the discontinuities of electrode part 13;

As shown in Figure 7, form insulation island 14 above the discontinuities of electrode part 13, described insulation island 14 is with electrode part 13 insulation lappings that are interrupted;

As shown in Figure 3, form the metal bridge 16 of the first electrodes 11 on surface, insulation island 14, described metal bridge 16 connects the electrode part 13 that is interrupted, and has in different aspects relative with electrode wedge angle 12 and bridge wedge angle 16 that put.

Comprise that perhaps step is as follows:

In the metal bridge 16 of substrate 10 formation the first electrode 11, described metal bridge 16 has bridge wedge angle 15;

Form insulation island 14 on the surface of metal bridge 16;

At electrode part 13 and second electrode 17 of substrate formation the first electrode 11 that forms insulation island 14, described electrode part 13 has interruption at insulation 14 places, island, by insulation island 14 insulation lappings, and can be by metal bridge 16 conduction connections; Described the second electrode 17 intersects with electrode part 13 and puts in the discontinuities of electrode part 13, and has in different aspects electrode wedge angle 12 relative with bridge wedge angle 15 and that put.

Wherein, the electrode part 13 of the first electrode 11 and the second electrode 17 adopt the method deposition ITO layer of magnetron sputtering, then form through the mask process wet etching; In like manner, metal bridge 16 adopts the method depositing metal layers of magnetron sputtering, then forms through the mask process wet etching; The method deposition of chemical vapor deposition is then adopted on insulation island 14, then forms through the mask process dry etching, and its material can be silicon dioxide, transparent polymeric organism, silicon nitride etc.

Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

Claims

1. a capacitive touch screen is characterized in that, comprising: be arranged on the first electrode on the substrate, the second electrode of putting with the first electrode crossing, wherein,

2. touch-screen as claimed in claim 1 is characterized in that, described electrode wedge angle and the bridge wedge angle of relatively putting comprises two pairs at least.

3. touch-screen as claimed in claim 1 is characterized in that, described metal bridge has pierced pattern over against the part of the second electrode.

4. touch-screen as claimed in claim 1 is characterized in that, entity part is X-shaped in the described pierced pattern.

5. touch-screen as claimed in claim 1 is characterized in that, described the first electrode is for driving transparency electrode, and described the second electrode is for surveying transparency electrode.