CN201788496U

CN201788496U - Capacitive touch screen

Info

Publication number: CN201788496U
Application number: CN2010205032792U
Authority: CN
Inventors: 姚伏恒
Original assignee: CHINA SHENZHEN DISPLAY TECHNOLOGY Co Ltd
Current assignee: CHINA SHENZHEN DISPLAY TECHNOLOGY Co Ltd
Priority date: 2010-08-24
Filing date: 2010-08-24
Publication date: 2011-04-06
Anticipated expiration: 2020-08-24

Abstract

The utility model provides a capacitive touch screen, which comprises a upper substrate, a lower substrate and a flexible print circuit board, wherein the upper and the lower substrates are laminated to each other, the flexible print circuit board is electrically connected with one of the substrates and pressed between the two substrates, a projection formed at the electrically connected joint between the flexible print circuit board and the substrate is inserted into a groove which is arranged on the other substrate, and position and shape of the groove correspond to those of the projection. The technical scheme includes that firstly the groove corresponding to the projection in terms of shape and location is arranged on the substrate without electrode wires, the two substrates are bonded together and the groove can hold the projection rightly, and finally the touch screen can be manufactured after solidification and package. As the projection formed at the electrically connected joint between the flexible printed circuit board and the substrate can be inserted into the groove formed on the other substrate rightly, the problem that the whole touch screen is uneven due to the thickness of the flexible print circuit board can be solved, clearance between the two substrates is reduced, glue usage for bonding the substrates is decreased and cost of products is reduced.

Description

Capacitive touch screen

Technical field

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

Background technology

Touch-screen can be used as a kind of interface instrument of electronic installation being operated by display screen, allow the user directly to touch or hand-written mode input information by point on the display device surface that is added with touch-screen, more friendly than input equipments such as mouse, keyboards, convenient, therefore be used in more and more widely on the various portable sets, as mobile phone, PDA etc.For example, the user can one just at display image, and with display device that touch-screen combines on input want the information imported.

According to the type (as finger, pen etc.) of use contactant and the difference of affirmation contact (position that contactant is operated touch-screen) mode, touch-screen can be divided into resistance-type, condenser type, infrared-type again, surface acoustic wave type etc.Along with the maturation of capacitive touch screen control IC technology, the decline of cost, and some distinctive advantages are arranged with respect to other several technology, good as durability, not fragile, can use for a long time, make capacitive touch screen application more and more widely.

The common structure of capacitive touch screen as shown in Figure 1, generally comprises the flexible circuit board (FPC) 17 of a transparent upper substrate 11 and a transparent infrabasal plate 16 and a conduction usefulness.Upper substrate 11, infrabasal plate 16 bond together by bonding agent 12, has two-layer transparency electrode 13 and 15 (also can have only one deck electrode) on the infrabasal plate, be provided with transparent insulating layer 14 between electrode layer 13 and electrode layer 15 electrode layer is kept apart, electrode is the form of sensor block.

Upper substrate 11 generally is to adopt hard materials such as glass, PC plate to make with infrabasal plate 16, is bonded together by cementing agent 12.Present normally used bonding agent is solid state optics glue or liquid optical glue, with upper and lower substrate bonding and be fitted in.

Adopt gluing substrate and the infrabasal plate of connecting of solid state optics, because the consistency of thickness of solid state optics glue is better, so can control two spacings between the substrate well, thereby can realize the thickness of whole touch screen unanimity well, but the shortcoming of this method is: can have a large amount of bubbles between the upper and lower base plate that fits together, utilize some defoaming methods bubble all can not be taken off, the yields that causes producing is subjected to great influence, solid state optics glue also increased production cost of products, so can be replaced by liquid optical cement gradually in actual applications.

Liquid optical cement produces the problem of bubble in the time of can solving upper substrate and infrabasal plate applying well, it as number of patent application 2009101049175 the disclosed technology of Chinese invention patent Shen Qing Publication instructions, but the problem that the method exists is: ITO (tin indium oxide) glass, be that infrabasal plate itself will or be crimped on flexible circuit board (being called for short FPC) 17 connections, in this connection or crimping part, nature can form a projection, as shown in Figure 2, because the thickness of FPC is generally 0.05mm～0.15mm, cause whole touch screen can form high low shape on one side on one side, like this, on the capacitive touch screen, the gap of infrabasal plate, and the touch-screen consistency of thickness just can not guarantee that promptly the flatness of touch-screen does not reach requirement.

Summary of the invention

The purpose of this utility model provides a kind of capacitive touch screen, is intended to solve existing touch panel after applying, and variable thickness causes, irregular problem.

A kind of capacitive touch screen that the utility model provides, comprise the upper and lower substrate that fits together, the flexible circuit board that is connected with electrode wires on the described substrate, described flexible circuit board is crimped between the described upper and lower substrate, be electrically connected the projection that part forms with substrate in described flexible circuit board and be placed in just, be provided with on another substrate with described raised position, the corresponding groove of shape in.

Convex shape is as described: long for L, wide thickness for D, flexible circuit board are the cuboid projection of H, then described groove just is the long L that is ₁, wide be D ₁, the degree of depth is H ₁The cuboid groove, and L ₁〉=L, wide be D ₁〉=D, depth H ₁〉=H.

Capacitive touch screen provided by the utility model, because flexible circuit board is electrically connected the projection that part forms with substrate, just be placed in the groove that is provided with on another substrate, like this, just can effectively improve existence because of the thickness of flexible circuit board own, cause the rugged problem of whole touch screen, improve the surface smoothness of touch-screen; Meanwhile, can also significantly reduce after two baseplate-laminatings up and down, the glue consumption of adhesive substrates is also reduced in the gap between the apparent surface thus significantly, reduces the cost of product.

Description of drawings

Fig. 1 is the sectional structure chart of existing capacitive touch screen;

Fig. 2 is that the defective that existing capacitive touch screen exists after applying forms synoptic diagram;

Fig. 3 is the side view of touch-screen upper substrate described in the utility model;

Fig. 4 is the vertical view of touch-screen upper substrate described in the utility model;

Fig. 5 is a capacitive touch screen structural representation described in the utility model;

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Referring to Fig. 3, Fig. 4, the capacitive touch screen that the utility model provides, comprise the upper substrate 11, the infrabasal plate 16 that fit together, the flexible circuit board 17 that is connected with electrode wires on the described substrate, described flexible circuit board is crimped between the described upper and lower substrate, is electrically connected the projection 18 that part forms with substrate in described flexible circuit board and is placed in just, be provided with on another substrate with described protruding 18 positions, the corresponding groove 19 of shape in.

Convex shape is as described: long for L, wide thickness for D (not shown), flexible circuit board are the cuboid projection of H, then described groove just is the long L that is ₁, wide be D ₁, the degree of depth is H ₁The cuboid groove, and L ₁〉=L, wide be D ₁〉=D, depth H ₁〉=H, promptly groove 19 is a bit larger tham projection 18, so that projection 18 can be placed in the groove 19, and matches with groove 19 shapes.

The method that realizes said structure is: flexible circuit board 17 and described touch-screen are had the substrate of electrode wires, realize being electrically connected as infrabasal plate 16; And on another substrate of described touch-screen, promptly upper substrate 11 is opened a groove 19, and it is corresponding to make described groove 19 shapes, position and described flexible circuit board be electrically connected projection 18 shapes, position that part forms naturally with substrate;

Upper and lower two substrates with described touch-screen bond together by bonding agent again, and described groove, projection are contained togather just, treat that described bonding agent diffusion levelling is to the binding face that is full of upper and lower substrate; Treat after the described glue curing, encapsulate and make the capacitive touch screen after the applying.

The utility model is owing to projection, groove are corresponding, match, and be placed in fully together, can reduce the gap between upper and lower two substrates of capacitive touch screen, reduction or elimination cause whole touch screen to form high, the low defective in one side on one side after applying because of the existence of flexible circuit board.

Claims

1. capacitive touch screen, comprise the upper and lower substrate that fits together, the flexible circuit board that is connected with electrode wires on the described substrate, described flexible circuit board is crimped between the described upper and lower substrate, it is characterized in that: be electrically connected the projection that part forms with substrate in described flexible circuit board and be placed in just, be provided with on another substrate with described raised position, the corresponding groove of shape in.

2. capacitive touch screen according to claim 1 is characterized in that: convex shape is as described: long for L, wide thickness for D, flexible circuit board are the cuboid projection of H, then described groove just is the long L that is ₁, wide be D ₁, the degree of depth is H ₁The cuboid groove, and L ₁〉=L, wide be D ₁〉=D, depth H ₁〉=H.