CN103425362A - Round projected capacitive touch screen - Google Patents

Abstract

The invention discloses a round projected capacitive touch screen. The round projected capacitive touch screen comprises a panel and a sensing functional sheet, wherein the panel is disposed on the sensing functional sheet, the sensing functional sheet comprises a substrate, a sensing pattern layer, a shielding layer, a circuit layer, a first OC (optic) layer and a second OC layer, the sensing pattern layer and the shielding layer are partitioned by the second OC layer, the first OC layer is disposed between the shielding layer and the circuit layer which is disposed on the substrate, the sensing pattern layer comprises N circular-layer rounds, a round with the radius R2 is designed at the center of the sensing pattern layer to serve the first circular layer, the inner diameter of the Nth circular-layer round is formed on the basis that the outer diameter of the N-1th circular-layer round extends outwards by R1, the inner diameter of the N circular-layer round is extended outwards by R2 to serve as the outer diameter of the Nth circular-layer round, and N is larger than one. The round projected capacitive touch screen has the advantages that a touch screen being of a traditional rectangular structure is extended into round, the current situation that the touch screen structure is single is compensated to a certain degree, and requirements on special-shape touch screens from the markets are met.

Description

A kind of projected capacitive touch screen of circle

Technical field

The present invention relates to a kind of projected capacitive touch screen, relate in particular to a kind of projected capacitive touch screen of circle.

Background technology

General touch screen technology comprises the resistive touch screen that is applicable to mobile device and consumption electronic product and projected capacitive (projected capacitive) touch-screen and for surface capacitance type (surface capacitive) touch-screen, surface acoustic wave (SAW) touch-screen and the infrared touch panel of other application.Wherein projected capacitive touch screen is because possess the function of multiple point touching, so yield unusually brilliant results on consumer-electronics applications.Be provided with the conductive layer be overlying on base material in projected capacitive touch screen, conductive layer is generally ITO conductive layer (two-layer), on every layer of conductive layer, is distributed with electrode strip, and one deck is as row matrix, and one deck is as column matrix.Wire for end points (can and print two kinds of modes and process by plating) at each strip electrode is drawn, and then by flexible PCB, wire is drawn with the external circuit control chip and is connected.The row of the internal electrode of projected capacitive touch screen and row, column and row, or the electric capacity that can produce between row and row.Its principle of work is to touch and changed the capacitance profile of electrode strip in touch place by staff, thereby be identified.

Along with popularizing gradually of smart mobile phone, almost each famous brand has all been released the mobile phone with the projected capacitive touch screen, and screen is increasing.Most of cellies may hesitate to some extent on brand is selected, but basically all can select to buy touch-screen mobile phone.Along with progressively popularizing of projected capacitive touch screen mobile phone, this technology has replaced the four-wire resistance type touch screen technology gradually becomes the market mainstream.In fact, although the consumer understands touch-screen and be few, once projected capacitive touch screen and four-wire resistance type touch screen were used in contrast, better projected capacitive touch screen of effect sense (feel) just is bound to select to touch.

Because the reason of principle of work, the functional areas of existing touch-screen are all the patterns of rectangle, in application, it has the restriction of a lot of occasions, causes now no matter be that smart mobile phone or panel computer are all faced a same problem, and that is exactly similar, outward appearance similar of function.Therefore release the task of top priority that a distinguished product is exactly current each producer, so far, the touch-screen of radian has appearred having, also has transparent display screen etc., and also have circular LCDs to emerge, but but do not have can be supporting with it circular touch-screen, the projected capacitive touch screen that therefore the invention provides a kind of circle comes and this special display screen coupling.

Summary of the invention

The technical problem to be solved in the present invention is, single for touch screen structure in prior art, can not satisfying the market to the defects such as demand of special-shaped touch-screen, provide a kind of can with the projected capacitive touch screen of the circle of existing circular display screen coupling.

The technical solution adopted for the present invention to solve the technical problems is: a kind of projected capacitive touch screen of circle, comprise panel and inducing function sheet, panel is placed on the inducing function sheet, the inducing function sheet comprises substrate, induction patterned layer, screen layer, line layer, OC1 layer and OC2 layer, between induction patterned layer and screen layer, with the OC2 layer, separate, the OC1 layer is between screen layer and line layer, and line layer is placed on substrate; The induction patterned layer comprises N ring layer circle, at a radius of circle centre position design of responding to patterned layer, is R₂Circle as the 1st ring layer, the internal diameter of N ring layer circle is to extend out R on the basis of N-1 ring layer circle external diameter₁Form, on the basis of N ring layer circle internal diameter, extend out R₂As the external diameter of N ring layer circle, N is greater than 1.

In the projected capacitive touch screen of circle of the present invention, bonding by optical glue (LOCA) or optics adhesive tape (OCA) between panel and induction patterned layer.

In the projected capacitive touch screen of circle of the present invention, be evenly distributed with aperture on OC2 layer, OC1 layer and screen layer, and the aperture on screen layer is larger than the aperture on OC2 and OC1 layer.

In the projected capacitive touch screen of circle of the present invention, R₁Be less than 1mm, R₂Span be 4mm-6mm.

In the projected capacitive touch screen of circle of the present invention, N ring layer circle is divided into 4*M sensor block, and M is greater than 1.

In the projected capacitive touch screen of circle of the present invention, induction patterned layer, screen layer and line layer are respectively ITO induction patterned layer, ITO screen layer and ITO line layer.

The principle of work of touch-screen of the present invention is: in touch-screen of the present invention, N ring layer circle is divided into to 4*M sensor block, using the 4*M of each a ring layer sensor block as an induction bar, will an electric capacity in parallel when with hand or felt pen touch sensible piece the time during to touch-screen, original circuit goes, thereby the overall electric capacity on respective scan line is changed to some extent, then described touch-screen is just determined the touch point coordinate position according to the capacitance variations before and after scanning, M is greater than 1, N and is greater than 1.

In touch-screen of the present invention, panel can be tempered glass, PMMA(acryl) etc. known various materials, as optimal way, described material is tempered glass.

In touch-screen of the present invention, described substrate can be selected glass, PC(polycarbonate) and the transparent material such as film.

In touch-screen of the present invention, bonding by optical glue (LOCA) or optics adhesive tape (OCA) between panel and induction patterned layer, optical glue and optics adhesive tape are to be usually used in the bonding special adhesive of transparent optical element, there is water white transparency, transmittance reaches more than 90%, bonding strength is good, high clinging power, high weather-proof, water tolerance, high temperature resistant, uvioresistant and long-time use can not produce xanthochromia, the advantage such as peel off and rotten, therefore use optical glue and optics adhesive tape just can guarantee that panel is larger with induction patterned layer bond strength, water tolerance, high temperature resistant and long-time use can not produce xanthochromia, peel off and rotten etc.

As a kind of improvement to technical scheme of the present invention, be evenly distributed with aperture on OC2 layer and OC1 layer, these apertures are the vias between induction patterned layer and line layer, also be evenly distributed with aperture on screen layer, but the aperture on screen layer is more slightly bigger than the aperture on OC2 layer and OC1 layer, so just can avoid screen layer to follow induction patterned layer or line layer short circuit.

As the another kind to technical scheme of the present invention, improve, N ring layer circle is divided into 4*M sensor block, wherein M is greater than 1, N is greater than 1, and each sensor block is independently controlled, touching one of them zone can't affect the work in other zones, and this has just guaranteed that touch-screen of the present invention can realize multiple point touching.

Preferably, induction patterned layer of the present invention, screen layer and the selected material of line layer are the ITO conductive film.The ITO conductive film is the material that is coated with uniform tin indium oxide (being called for short ITO) conductive layer on transparent PET film substrate, by etch away unwanted ITO on conductive film with strong acid, makes segment as shown in Figure 2.

Advantage of the present invention has been to provide a kind of projected capacitive touch screen of circle, this touch-screen has expanded to circle by the touch-screen of traditional rectangular configuration, make up more to a certain extent the single present situation of present stage touch screen structure, the demand of satisfying the market to special-shaped touch-screen.

The accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:

Fig. 1 is the structural representation of inducing function sheet of the present invention;

Fig. 2 is the design diagram (only illustrated 4 ring layers, the 5th ring layer by that analogy) of the touch piece of induction patterned layer;

Fig. 3 is the schematic diagram of OC1 layer and OC2 layer;

Fig. 4 is the schematic diagram of screen layer;

Fig. 5 is the schematic diagram of line layer;

Fig. 6 is comparative example's design proposal.

Now that the label declaration in accompanying drawing is as follows: 1 is the induction patterned layer, and 2 is screen layer, and 3 is line layer, and 4 is the OC2 layer, and 5 is the OC1 layer, and 6 is substrate.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.

In preferred embodiment of the present invention, the structure of inducing function sheet of the present invention as shown in Figure 1, the inducing function sheet comprises 3 layers of ITO conductive layer and the 2 layers of OC layer that plate on substrate and substrate, 3 layers of ITO conductive layer are kept apart with 2 layers of OC layer, most surface be the induction patterned layer 1, as the patterned layer of touch function, bottom one deck is line layer 2, middle one deck is screen layer 3, as the screen layer between induction patterned layer 1 and line layer 3.By the segment on touch sensible patterned layer 1, can identify the position of touch; As shown in Figure 3, OC1 layer 5 and all be evenly distributed with aperture above OC2 layer 4, these apertures are as the induction patterned layer 1 of the superiors and the via between line layer 3, it below OC2 layer 4, is screen layer 2, as shown in Figure 4, also be evenly distributed with aperture on screen layer 2, these apertures are more slightly bigger than the hole on OC2 layer 4 and OC1 layer 5, so just can avoid dislocation to cause screen layer 2 with induction patterned layer 1 or line layer 3 short circuits; Bottom one deck is line layer 3, and as shown in Figure 5, main being responsible for of line layer 3 drawn circuit, and is connected with control chip.Induction patterned layer 1 comprises N ring layer circle, as shown in Figure 2, at a radius of circle centre position design of responding to patterned layer 1, is R₂Circle as the 1st ring layer, then on the frame of the 1st ring layer, extend out R₁As the internal diameter of the 2nd ring layer circle, the external diameter of the 2nd ring layer circle is to extend out R on the basis in footpath within it₂, and then extend out R on the basis of the 2nd ring layer circle external diameter₁As the internal diameter of the 3rd ring layer circle, by that analogy, design the 3rd ring layer circle, the 4th ring layer circle, until N ring layer circle, N ring layer also needs to be divided into 4*M sensor block, in the present embodiment, R₁Span be preferably 0-1mm, R₂Preferred span is 4mm-6mm, M, N>1.

The 4*M of each a ring layer sensor block is defined as to an induction bar, and hand touches on this induction bar, and touch-screen of the present invention will calculate the change in location in 360 degree scopes in this ring layer circle.Each sensor block is independently controlled, and touches the work that one of them zone can't affect other zones, so touch-screen of the present invention can be realized multiple point touching, M > 1.

The comparative example is as follows: as shown in Figure 6, prior art and embodiment difference just be, the functional areas of existing projected capacitive touch screen are all the patterns of rectangle, and the functional areas of projected capacitive touch screen of the present invention are circular.

Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.

Claims (6)

1. the projected capacitive touch screen of a circle, comprise panel and inducing function sheet, described panel is placed on the inducing function sheet, it is characterized in that, described inducing function sheet comprises substrate (6), induction patterned layer (1), screen layer (2), line layer (3), OC1 layer (5) and OC2 layer (4), between described induction patterned layer (1) and screen layer (2), with described OC2 layer (4), separate, described OC1 layer (5) is positioned between described screen layer (2) and line layer (3), and described line layer (3) is placed on described substrate (6); Described induction patterned layer (1) comprises N ring layer circle, at the radius of circle centre position design of described induction patterned layer (1), is R₂Circle as the 1st ring layer, the internal diameter of N ring layer circle is to extend out R on the basis of N-1 ring layer circle external diameter₁Form, on the basis of described N ring layer circle internal diameter, extend out R₂As the external diameter of N ring layer circle, N is greater than 1.

2. the projected capacitive touch screen of circle according to claim 1, is characterized in that, bonding by optical glue or optics adhesive tape between described panel and induction patterned layer (1).

3. the projected capacitive touch screen of circle according to claim 1, it is characterized in that, be evenly distributed with aperture on described OC2 layer (4), OC1 layer (5) and screen layer (2), and the aperture on described screen layer (2) is larger than the aperture on OC2 layer (4) and OC1 layer (5).

4. the projected capacitive touch screen of circle according to claim 1, is characterized in that, described R₁Be less than 1mm, R₂Span be 4mm-6mm.

5. the projected capacitive touch screen of circle according to claim 1, is characterized in that, described N ring layer circle is divided into 4*M sensor block, and M is greater than 1.

6. the projected capacitive touch screen of circle according to claim 1, is characterized in that, described induction patterned layer (1), screen layer (2) and line layer (3) are respectively ITO induction patterned layer, ITO screen layer and ITO line layer.

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