CN205302250U

CN205302250U - Capacitive touch screen

Info

Publication number: CN205302250U
Application number: CN201521135798.7U
Authority: CN
Inventors: 陈文威; 李丽敏
Original assignee: Shenzhen AV Display Co Ltd
Current assignee: Akita Shenzhen microelectronics Limited by Share Ltd
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2016-06-08
Anticipated expiration: 2025-12-30

Abstract

The utility model is suitable for a touch -sensitive screen technical field provides a capacitive touch screen, and it includes from last apron, glue or photoelectricity glue film to superpose in proper order down, first laser silver line layer, a ITO layer, glass substrate, the 2nd ITO layer, second laser silver line layer and the 3rd ITO layer. The range upon range of second laser silver line layer below of placing in of the 3rd ITO to the 3rd ITO layer is connected with the regional electricity of ground connection of element region. The utility model discloses on the basis of original capacitive touch screen structure, increased by the 3rd ITO layer in its bottom to can shield the electromagnetic interference who comes from external environment condition or TFT. Simultaneously, the 3rd ITO layer can be leading -in to the ground connection regional (ground wire) of element region in with the electrostatic charge in the touch -sensitive screen to promote the anti ESD performance of product, improved the stability of product.

Description

A kind of capacitive touch screen

Technical field

This utility model belongs to touch screen technology field, particularly relates to a kind of capacitive touch screen.

Background technology

Projection-type mutual inductive capacitance touch screen is generally adopted two-layer ITO (tin indium oxide) film, formation matrix form is distributed, using RX (sensing), TX (driving) cross-distribution as capacitance matrix, the electric current sensing of human body is utilized to be operated. People is ground connection thing (i.e. electric conductor), to the logical very low voltage of work surface, when user touches screen, finger absorbs an only small electric current, by the scanning to X-axis (RX), Y-axis (TX), the capacitance variations of touch position being detected, the signal detected is delivered in the IC in element region and is calculated by touch screen, and then calculates finger touch points position.

Refer to Fig. 1, for existing a kind of DITO (dual oxide indium stannum) capacitive screen structure, it is top to bottm followed successively by cover plate 1, glue 2 (or optical cement (OCA, OpticalClearAdhesive)), first laser silver wire layer the 3, first ITO layer 4, glass substrate the 5, second ITO layer 6 and the second laser silver wire layer 7.

Owing to the surface resistance of ITO is generally 80��100 ��, the surface resistance of Ag is 0.4 ��, and touch screen IC is for the resistance general 15K �� of requirement of pattern cabling, so being all covered with Ag cabling above ITO, reduce from V.A district (visible area) to the resistance of flexible PCB element region (FPC, FlexibleprintedCircuit) golden finger.

As can be seen from Figure 1, the cabling of upper strata ITO and Ag electrode, four periderm glues or OCA wrap up, it is possible to avoid the electric charge of Electro-static Driven Comb (ESD, Electro-Staticdischarge) to throw into. And lower floor ITO and Ag electrode cabling are protected owing to not having, ESD impacts into from the side, if skipping ground wire, cannot timely ESD charge be led away. ESD charge can channel to and on Ag electrode cabling, cabling be blown, and causes deadlock or region to touch ineffective.

The capacitance plate back side need to be covered with ITO pattern and Ag cabling, with thin film transistor (TFT) (TFT, ThinFilmTransistor) distance of interval 0.3��1mm, TFT liquid crystal is shown with the electromagnetic interference from drive circuit, or the environment of the outside high radiation of product and electromagnetic interference, the reliability and stability of capacitance touch screen can be affected.

Utility model content

Technical problem to be solved in the utility model is in that to provide a kind of capacitive touch screen, it is intended to solve the anti-static electrictity release ability existing for capacitive touch screen of the prior art and all more weak problem of electromagnetic shielding capability.

This utility model is realized in, a kind of capacitive touch screen, it includes the cover plate, glue or photoelectricity glue-line, the first laser silver wire layer, the first ITO layer, glass substrate, the second ITO layer and the second laser silver wire layer that are sequentially stacked from top to bottom, described touch screen also includes the 3rd ITO layer, described 3rd ITO layer is stacked and placed on below the second laser silver wire layer, and described 3rd ITO layer electrically connects with the ground area of element region.

Further, described 3rd ITO layer is electrically connected with the ground area of element region by a wire.

Further, described wire is made up of flexible PCB.

Further, one end of described wire is bundled in described 3rd ITO layer, and the other end welds with the ground area of element region.

This utility model compared with prior art, has the beneficial effects that: this utility model, on the basis of original capacitive touch screen structure, adds the 3rd ITO layer bottom it, such that it is able to shield the electromagnetic interference from external environment condition or TFT. Meanwhile, the electrostatic charge in touch screen can be imported in the ground area (ground wire) of element region by the 3rd ITO layer, thus improving the against esd performance of product, improves the stability of product.

Accompanying drawing explanation

Longitudinal cross-sectional schematic of Fig. 1 a kind of capacitive touch screen of the prior art.

Fig. 2 is longitudinal cross-sectional schematic of a kind of capacitive touch screen that this utility model embodiment provides.

Fig. 3 is the schematic diagram that its 3rd ITO layer of the capacitive touch screen shown in Fig. 2 electrically connects with the ground area of element region.

Detailed description of the invention

In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, this utility model is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain this utility model, be not used to limit this utility model.

As shown in Figures 2 and 3, for a preferred embodiment of the present utility model, a kind of capacitive touch screen, it includes the cover plate 1, gelatine layer 2 (or photoelectricity glue-line), first laser silver wire layer the 3, first ITO layer 4, glass substrate the 5, second ITO layer the 6, second laser silver wire layer 7 and the 3rd ITO layer 8 that are sequentially stacked from top to bottom. And the 3rd ITO layer 8 electrically connects with the ground area of element region 200.

Specifically, above-mentioned 3rd ITO layer 8 is electrically connected with the ground area of element region 200 by a wire 10. This wire 10 is made up of a bit of flexible PCB. One end of wire 10 is bundled in the 3rd ITO layer 8 in advance, and the other end electrically connects with the ground area of element region 200 by welding.

The present embodiment, on the basis of original capacitive touch screen structure, adds the 3rd ITO layer 8 bottom it, such that it is able to shield the electromagnetic interference from external environment condition or TFT. Meanwhile, the electrostatic charge in touch screen can be imported in the ground area (ground wire) of element region 200 by the 3rd ITO layer 8, thus improving the against esd performance of product, improves the stability of product.

The foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within protection domain of the present utility model.

Claims

1. a capacitive touch screen, it includes the cover plate, glue or photoelectricity glue-line, the first laser silver wire layer, the first ITO layer, glass substrate, the second ITO layer and the second laser silver wire layer that are sequentially stacked from top to bottom, it is characterized in that, described touch screen also includes the 3rd ITO layer, described 3rd ITO layer is stacked and placed on below the second laser silver wire layer, and described 3rd ITO layer electrically connects with the ground area of element region.

2. capacitive touch screen as claimed in claim 1, it is characterised in that described 3rd ITO layer is electrically connected with the ground area of element region by a wire.

3. capacitive touch screen as claimed in claim 2, it is characterised in that described wire is made up of flexible PCB.

4. capacitive touch screen as claimed in claim 2 or claim 3, it is characterised in that one end of described wire is bundled in described 3rd ITO layer, and the other end welds with the ground area of element region.