CN103677450A

CN103677450A - Capacitive touch screen

Info

Publication number: CN103677450A
Application number: CN201210315151.7A
Authority: CN
Inventors: 张钦富; 李政翰
Original assignee: Empia Technology Inc
Current assignee: Egalax Empia Technology Inc
Priority date: 2012-08-30
Filing date: 2012-08-30
Publication date: 2014-03-26

Abstract

The invention relates to a mutual capacitance type multi-touch screen. When the states and patterns of conductive strips facilitate that the contact scope between each external conductive object and the a mutual capacitance type multi-touch screen is larger than a preset condition, the amount that each external conductive object is coupled on each first conductive strip in a capacitive mode is larger than the amount that each external conductive object is coupled on each second conductive strip in a capacitive mode, so that the proportions between drive signals transmitted out of the conductive strips from at least one first external conductive object among the external conductive objects and drive signals transmitted into the second conductive strips from at least one second external conductive object among the external conductive objects will decrease along with the increase of the quantity of the second external conductive objects.

Description

Capacitive touch screen

Technical field

The present invention relates to a kind of capacitive touch screen, particularly relate to a kind of negative capacitive touch screen that touches impact that reduces.

Background technology

Please refer to shown in Figure 1A, when driving signal D through a driven bus, signal I may flow to the second finger B by the first finger A of the same hand, cause in scanning the process of sensing information SI, sensed bus corresponding to the first finger A and the second finger B all can sense the variation of mutual capacitance coupled signal, respectively as shown in touching associated sensed information SA and SB.By Figure 1A, can be learnt, wherein touch the variation lifting reversed in order of associated sensed information SA and SB, that is signal be contrary.

Touching associated sensed information SA representative, corresponding to the sensed bus at the first finger A place and the capacitively coupled variation in driven bus intersection district, exists and just touches (real touch).Similarly, touching associated sensed information SB representative is corresponding to the sensed bus at the second finger B place and the capacitively coupled variation in driven bus intersection district, yet, the intersection district of touching associated sensed information SB representative is not touched, judged out negative (unreal touch), the i.e. terrible point (phantom touch) of touching by accident.In the following description, the signal that flows out bus because of the capacitive couplings of the first finger A is called and just touches signal, and the signal that flows into bus because of the capacitive couplings of second finger B is called the negative signal that touches.Therefore by bus, detect corresponding to just tactile signal and the negative capacitive couplings of touching signal and change the touching associated sensed information that is respectively just tactile and bear tactile touching associated sensed information.

Please refer to shown in Figure 1B, when the first finger A and the second finger B are positioned at close or identical sensed bus, touch accordingly associated sensed information SA with SB because signal causes and cancels out each other on the contrary mutually, signal is diminished.When touching associated sensed information SA and SB intensity approach, may cause signal gets too small and cannot interpretation go out just tactile.In the following description, because the negative signal that touches is called the negative effect of touching with the contiguous situation of the just tactile capacitive couplings variable quantity distortion detecting that causes of just tactile signal.

In above-mentioned example, the first finger A and the second finger B are across insulation top layer and bus capacitive couplings, and when insulation top layer is thinner, negative tactile effect is larger.That is the just tactile capacitive couplings variable quantity distortion detecting must be more serious.In addition, when causing the quantity of negative tactile second finger B more, the total amount of negative tactile signal is larger, and the just tactile capacitive couplings variable quantity distortion detecting must be more serious, even the just tactile touching associated sensed information of script is rendered as to negative tactile touching associated sensed information.In other words, under worst-case conditions (worst case), all the second finger B and the first finger A are positioned at identical by detecting bus (detected electrode strips), and now the negative effect of touching be maximum.Apparently, when mutual capacitance type is detected, to the negative tolerance of touching effect determined whether correctly to detect just tactile position with can detect simultaneously just touch the quantity of position.

Above-mentioned negative tactile effect is even more serious on portable apparatus, and this is because the ground of portable apparatus system is different from the ground of human body contact.Due to the demand in market, portable apparatus is required more and more thinner, thus capacitive touch screen be also required must be more and more thinner.Capacitive touch screen is often configured in above display, the continuous interference capacitors formula touch-screen of noise meeting that display conduction comes, the most direct method is that the back side (near the part of display) at capacitive touch screen adds last layer back of the body shield layer (rear shielding layer), on back of the body shield layer, load earthing potential, the noise coming to isolate display conduction.Yet the increase of back of the body shield layer, must increase the thickness of capacitive touch screen, is relatively difficult to accord with the demands of the market.

Will not increase under the situation of back of the body shield layer, reduce the interference of the next noise of display conduction simultaneously, the technological means the most often adopting is exactly at double-decker (DITO; Double ITO) in, by being provided, drive the bus (driven bus) of signal to be placed in lower floor, and sensed bus is placed in to upper strata, wherein driven bus covers most display, except being provided the bus that drives signal, all be provided earthing potential, produce the effect of similar back of the body shield layer.Because sensed bus is on upper strata, in order to reduce the negative effect of touching, the just attenuation effectively of thickness on insulation top layer.When insulation top layer use be glass material time, sensed bus need and finger between need to remain on about 1.1mm more than.Even fit for the glass of supporting with plastic material, more than needing to remain on about 0.7mm between sensed bus needs and finger.In the situation that the thickness on insulation top layer has so strict restriction, just can only dwindle the thickness of the insulation intermediary layer between driven bus and sensed bus.

With respect to double-decker, single layer structure (SITO; Single ITO) also there is the thickness limits on same insulation top layer on insulation top layer, but due to the intermediary layer that do not insulate, integral thickness is thin many with respect to double-decker, but has also lost the effect of above-mentioned similar back of the body shield layer.If cannot effectively reduce the interference of the next noise of display conduction, single layer structure is applicable to being arranged in display (In cell).If be placed in display top, the selection that back of the body shield layer just may necessitate.

The interference of the noise that display conduction comes has reduced the ability of judging just tactile position, and the negative many abilities of just touching positions of judgement of having touched effects.Apparently, the thickness reduction of capacitive touch screen may be needed to consider sensed bus needs and the distance between finger, even also consider possibly the interference how anti-display conducts the noise coming.

As can be seen here, above-mentioned prior art obviously has inconvenience and defect, and the utmost point is waited to be further improved.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but have no for a long time applicable design is completed by development always, and common product and method do not have appropriate structure and method to address the above problem, this is obviously the problem that the anxious wish of relevant dealer solves.Therefore how to found a kind of new technology, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.

Summary of the invention

While carrying out multiple spot mutual capacitance type detecting (mutual capacitive multi-touch detection) in mutual capacitance type multi-point touch screen (mutual capacitive multi-touch screen), drive signal with the first finger in palm, to be circulated to the second finger by capacitive couplings warp, may reduce, for representing signal or the change amount signal of just tactile position, to cause just tactile erroneous judgement.Object of the present invention is reducing the negative effect of touching of circulation between referring to.

While carrying out multiple spot mutual capacitance type detecting (mutual capacitive multi-touch detection) in capacitive touch screen (mutual capacitive multi-touch screen), the capacitive couplings of the signal circulating between a plurality of external conductive objects flows into mutual capacitance type multi-point touch screen may cause the just tactile capacitive couplings variable quantity serious distortion being detected, for fear of this problem, the effectively attenuation of thickness on insulation top layer.

Therefore, the object of the invention is to, by the bus aspect of capacitive touch screen, impel the capacitive couplings of driven bus and external conductive object to be greater than by the capacitive couplings of detecting bus and external conductive object, reduce and drive signal to flow into by the ratio of detecting bus again from bus flows out across the capacitive couplings of top layer by a plurality of external conductive objects that insulate.Whereby, the negative effect of touching can be lowered, and along with negative reduction of touching signal, the thickness on insulation top layer just can be thinner.

In addition, by the mode with difference or two differences presents by the capacitive couplings signal being provided by detecting bus, effectively reduce the noise from behind display, save the setting of back of the body shield layer, can further reduce the thickness of the many touch-screens of mutual capacitance type.Wherein, by the mode with two differences presents by the capacitive couplings signal being provided by detecting bus, more can reduce the distorted signals problem causing because of pressurized deformation simultaneously.

In the many touch-screens of a kind of mutual capacitance type that propose in the present invention, the area that exposes that the aspect of bus impels the contact range of effective touching that can be detected tram to be covered in shielding aspect was greater than by the exposing area or be greater than the area that exposes of bus aspect of detecting bus, or contact range is covered in shielding aspect and is greater than with the area that exposes of driven bus the area external conductive object of being detected bus.Therefore driving signal when the capacitive couplings of top layer by a plurality of external conductive objects that insulate flows into bus again from bus flows out, flow into by the signal of detecting bus and can relatively reduce the impact of position detecting.

In the many touch-screens of another kind of mutual capacitance type that the present invention proposes, be to be greater than and by detecting bus, apart from the distance of external conductive object, the capacitive couplings of driven bus and external conductive object to be greater than detected the capacitive couplings of bus apart from the distance of external conductive object with driven bus.Therefore driving signal when the capacitive couplings of top layer by a plurality of external conductive objects that insulate flows into bus again from bus flows out, flow into by the signal of detecting bus and can relatively reduce the impact of position detecting.

Apparently, in the many touch-screens of aforesaid mutual capacitance type, with respect to the bus of being detected, driven bus can be larger close to external conductive object and the area that exposes, has both advantages concurrently.

The object of the invention to solve the technical problems realizes by the following technical solutions.The method for detecting of the capacitive touch screen proposing according to the present invention, in order to detect approaching or touching of external conductive object, it comprises: capacitive touch screen is provided, rectangular, there are two relative long limits and two relative minor faces, comprise: while detecting for mutual capacitance type, be operatively provided many first buss that drive signal, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is the outstanding Extendible flake in every one side by four limits of square or rhombus, wherein said the first bus is parallel with minor face, and many second buss that mutual capacitance coupled signal is provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is that wherein said the second bus is parallel with long limit by a sinking space of every one side depression on four limits of square or rhombus, and provide this driving signal, and when being provided this driving signal, at least one bus receives described mutual capacitance coupled signal by described the second bus, by long limit, provide and drive signal at least one the first buss, and at minor face, by described the second bus, receive aforementioned mutual capacitance coupled signal when at least one the first buss are provided this driving signal.

The object of the invention to solve the technical problems also realizes by the following technical solutions.The device of the tool capacitive touch screen proposing according to the present invention, in order to detect approaching or touching of external conductive object, it comprises: capacitive touch screen: while detecting for mutual capacitance type, be operatively provided many first buss that drive signal, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is the outstanding Extendible flake in every one side by four limits of square or rhombus; And many second buss that mutual capacitance coupled signal is provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is the sinking space of every one side depression by four limits of square or rhombus; And control circuit, this driving signal is provided, and by described the second bus, receives described mutual capacitance coupled signal when at least one bus is provided this driving signal; One of wherein said the first bus mutually exposes with described the second bus and is separated, and the accommodating described Extendible flake of each sinking space.

The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.

Preferably, the device of aforesaid tool capacitive touch screen, the area that wherein each first conducting strip is removed described Extendible flake is equal to or greater than the area that each second conducting strip adds the above sinking space, and the area that described the first conducting strip is exposed is greater than the area of described the second conducting strip.

Preferably, the device of aforesaid tool capacitive touch screen, wherein said the first conducting strip and described the second conducting strip are in the same plane.

Preferably, the device of aforesaid tool capacitive touch screen, the quantity of wherein said the first bus is greater than the quantity of described the second bus.

Preferably, the device of aforesaid tool capacitive touch screen, wherein each first connecting line strides across one of described second connecting line or each the second connecting line strides across one of described first connecting line, is insulated thing and separates between the first connecting line of its centre-exchange-meeting and the second connecting line.

Preferably, the device of aforesaid tool capacitive touch screen, not at grade, the second described bus of wherein said the first bus approaches external conductive object for wherein said the first conducting strip and described the second conducting strip.

Preferably, the device of aforesaid tool capacitive touch screen, wherein this capacitive touch screen also comprises that insulation course is between described the first bus and described the second bus.

Preferably, the device of aforesaid tool capacitive touch screen, it also comprises display, wherein between this display and described the second conducting strip, do not exist and be provided the maybe back of the body shield layer of this driving signal of a DC potential, wherein this DC potential maybe this driving signal be to be provided when described the second bus provides described mutual capacitance coupled signal.

Preferably, the device of aforesaid tool capacitive touch screen, not at grade, the first described bus of wherein said the second bus approaches this display for wherein said the first conducting strip and described the second conducting strip.

Preferably, the device of aforesaid tool capacitive touch screen, wherein this capacitive touch screen is rectangle, there are two relative long limits and two relative minor faces, wherein said the first bus is arranged in parallel with two minor faces between two minor faces, and the second described bus is arranged in parallel with two long limits between two long limits.

Preferably, the device of aforesaid tool capacitive touch screen, wherein this capacitive touch screen also comprises that Yu Liangtiao second side, both sides bus that two first side buss lay respectively at described the first bus lays respectively at the both sides of described the second bus, wherein each first side bus is comprised of many first connecting lines a plurality of half sheet the first conducting strips of connecting, and each second side bus is comprised of many second connecting lines a plurality of half sheet the second conducting strips of connecting.

Preferably, the device of aforesaid tool capacitive touch screen, wherein said the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-1 difference according to described mutual capacitance coupled signal, and each difference is that the mutual capacitance coupled signal of a pair of adjacent the second bus of foundation respectively subtracts each other to produce.

Preferably, the device of aforesaid tool capacitive touch screen, wherein said the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-2 two difference according to described mutual capacitance coupled signal, and each two difference is according to the difference of mutual capacitance coupled signal of front two electricity two buss and the difference of the mutual capacitance coupled signal of rear two electricity two buss in three the second adjacent buss, to subtract each other to produce respectively.

Preferably, the device of aforesaid tool capacitive touch screen, there are a plurality of the 3rd isolated conducting strips in the space of exposing between wherein said the first bus and described the second bus, and described conducting strip is identical material with the first described bus.

Preferably, the device of aforesaid tool capacitive touch screen, it also comprises display, does not exist shielding from the back of the body shield layer of the noise of display between described the first bus and display.

Preferably, the device of aforesaid tool capacitive touch screen, wherein said the first conducting strip is to have the square of leg-of-mutton Extendible flake or ten hexagons that rhombus extends out formation, and described the second conducting strip is to have ten hexagons that leg-of-mutton sinking space square or rhombus inside contract formation.

The object of the invention to solve the technical problems also realizes by the following technical solutions.The capacitive touch screen proposing according to the present invention, in order to detect approaching or touching of external conductive object, it comprises: while detecting for mutual capacitance type, be operatively provided many first buss that drive signal, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is the outstanding Extendible flake in every one side by four limits of square or rhombus; And many second buss that mutual capacitance coupled signal is provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is the sinking space of every one side depression by four limits of square or rhombus; One of wherein said the first bus mutually exposes with described the second bus and is separated, and the accommodating described Extendible flake of each sinking space.

Preferably, aforesaid capacitive touch screen, the area that wherein each first conducting strip is removed described Extendible flake equals the area that each second conducting strip adds the above sinking space, and the area that described the first conducting strip is exposed is greater than the area of described the second conducting strip.

Preferably, aforesaid capacitive touch screen, wherein said the first conducting strip and described the second conducting strip are in the same plane.

Preferably, aforesaid capacitive touch screen, the quantity of wherein said the first bus is greater than the quantity of described the second bus.

Preferably, aforesaid capacitive touch screen, wherein each first connecting line strides across one of described second connecting line or each the second connecting line strides across one of described first connecting line, is insulated thing and separates between the first connecting line of its centre-exchange-meeting and the second connecting line.

Preferably, aforesaid capacitive touch screen, not at grade, the second described bus of wherein said the first bus approaches external conductive object for wherein said the first conducting strip and described the second conducting strip.

Preferably, aforesaid capacitive touch screen, its Yu Liangtiao second side, both sides bus that also comprises that two first side buss lay respectively at described the first bus lays respectively at the both sides of described the second bus, wherein each first side bus is comprised of many first connecting lines a plurality of half sheet the first conducting strips of connecting, and each second side bus is comprised of many second connecting lines a plurality of half sheet the second conducting strips of connecting.

By technique scheme, capacitive touch screen of the present invention at least has following advantages and beneficial effect: with respect to offering external conductive object that signal flows out to bus in prior art, more negative to touch effect larger, in disclosed technical scheme, offering external conductive object that signal flows out to bus, more negative to touch effect less, contrary with prior art.Also representing that for void, to touch the tolerance of effect higher, the thickness on insulation top layer also can be thinner.

Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other object of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.

Accompanying drawing explanation

Figure 1A and Figure 1B are the negative schematic diagram that touches effect in prior art;

Fig. 1 C and Fig. 1 D are the schematic diagram of a position detection system;

The structural representation that Fig. 1 E-Fig. 1 H is sensed layer;

Fig. 2 A and Fig. 2 B are the empty analysis schematic diagram that touches effect;

Fig. 3 A-Fig. 3 D is the structural representation of bus aspect;

Fig. 4 is the schematic diagram of capacitive touch screen; And

Fig. 5 is the schematic flow sheet of leading the method for detecting of capacitive touch screen.

[main element symbol description]

A, B: finger D: drive signal

I: signal SI: sensing information

SA, SB: touching associated sensed information 100: arrangement for detecting

110: display 120: sensing apparatus

120A: the first sensed layer 120B: the second sensed layer

130: driving/detecting unit 140: bus

160: controller 161: processor

162: storer 170: main frame

171: CPU (central processing unit) 173: storage element

11,13,14,16: 12: the second connecting lines of conducting strip

Within 15: the first, connecting line 17: dielectric base

18: insulation course 19: insulation top layer

SD: drive signal P1: the first contact region

P2: the second contact region H1: the first finger

H2: second finger

140A, Tx1, Tx2: the first bus

140B, Rx1, Rx2: the second bus

Sg: the signal that is flow to ground by human body

S1: the signal that flows out bus

S2: the signal that flows into bus

Sr1, Sr2: the signal of being detected

Ctr1: the capacitive couplings amount between the first bus Tx1 and the second bus Rx1

Cht1: the capacitive couplings amount between the first bus Tx1 and the first finger H1

Chr1: the capacitive couplings amount between the second bus Rx1 and the first finger H1

Ctr2: the capacitive couplings amount between the first bus Tx2 and the second bus Rx2

Cht2: the capacitive couplings amount between the first bus Tx2 and second finger H2

Chr2: the capacitive couplings amount between the second bus Rx2 and second finger H2

Chg: the capacitive couplings amount between health and device

R: impedance

Cr: the capacitive couplings amount between second finger and the second bus

Cg: second finger and be provided the capacitive couplings amount between the circuit of direct current signal

Ir: the electric current that flows into the second bus

Ig: the electric current that flows into the circuit that is provided direct current signal

32: the second buss of 31: the first buss

34: the second conducting strips of 33: the first conducting strips

36: the second connecting lines of 35: the first connecting lines

37: Extendible flake 38: sinking space

39: the three conducting strips 40: capacitive touch screen

41: minor face 42: long limit

Embodiment

For further setting forth the present invention, reach technological means and the effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of capacitive touch screen, structure, feature and effect thereof to proposing according to the present invention, be described in detail as follows.

It is as follows that the present invention will describe some embodiment in detail.Yet except disclosed embodiment, the embodiment that the present invention can also be used in other widely implements.Scope of the present invention is not subject to the restriction of described embodiment, is that the scope with claims is as the criterion.And can understand summary of the invention of the present invention for clearer description being provided and making to be familiar with this skill person, in diagram, each several part is not drawn according to its relative size, some size is highlighted and the exaggeration that seems with the ratio regular meeting of other scale dependent, and incoherent detail section is not also drawn completely, in the hope of illustrated succinct.

Please refer to Fig. 1 C, the present invention proposes a kind of position detecting apparatus 100, comprises sensing apparatus 120, with driving/detecting unit 130.Sensing apparatus 120 has sensed layer, in one example of the present invention, can comprise the first sensed layer 120A and the second sensed layer 120B, the first sensed layer 120A and the second sensed layer 120B have respectively a plurality of buss 140, wherein a plurality of the second bus 140B crossovers of a plurality of the first bus 140A of the first sensed layer 120A and the second sensed layer 120B.In another example of the present invention, a plurality of the first bus 140A and the second bus 140B can be configured in coplanar sensed layer.Driving/detecting unit 130 produces sensing information according to the signal of a plurality of buss 140.For example, when self-capacitance formula is detected, be the driven bus 140 of detecting, and when mutual capacitance type detect, be what to detect is there is no driven partially conductive bar 140.In addition, sensing apparatus 120 can be to be configured on display 110, and 110 of sensing apparatus 120 and displays can be to have configuration back of the body shield layer (shielding layer) (not showing in icon) or do not configure back of the body shield layer.In a preferable example of the present invention, in order to make the thickness of sensing apparatus 120 thinner, 110 of sensing apparatus 120 and displays do not configure back of the body shield layer.

Aforementioned the first bus and the second bus can be many row buss and the row buss of arranging with row or column, can also be many first dimension buss and the second dimension bus of arranging with the first dimension and the second dimension, or along many first axle buss and the second axle bus of the first axle and the arrangement of the second axle.In addition, aforementioned the first bus and the second bus can be with quadrature crossover to each other, can also be with nonopiate crossover.For example, in a polar coordinate system, one of described the first bus or second bus can be radial arrangement, and another of described the first bus or the second bus can be annular arrangement.Moreover one of described the first bus or second bus can be drive bus, and another of described the first bus or the second bus can be detecting bus.Described " the first dimension " all can be used to represent aforesaid " first " and " second " bus with " detecting ", " driven " with " by detecting " bus with " the second axle ", " driving " with " the second dimension ", " the first axle ", including but not limited to form orthogonal grid (orthogonal grids), can also be to form how much frameworks (geometric configurations) that other has the first dimension and the second dimension crossover (intersecting) bus.

Position detecting apparatus 100 of the present invention can be to be applied in calculator system, and the example as shown in Fig. 1 D comprises controller 160 and main frame 170.Controller comprises driving/detecting unit 130, with the sensing apparatus 120 that is operatively coupled (not showing in diagram).In addition, controller 160 can comprise processor 161, controls driving/detecting unit 130 and produces sensing information, and sensing information can be to be stored in storer 162, for processor 161 accesses.In addition, main frame 170 forms the main body of computing system, mainly comprises CPU (central processing unit) 171, and the storage element 173 that supplies CPU (central processing unit) 171 accesses, and the display 110 that shows operation result.

In another example of the present invention, 170, controller 160 and main frame comprise transport interface, controller transmits data to main frame by transport interface, and those skilled in the art can know transport interface by inference and include but not limited to the various wired or wireless transport interface such as UART, USB, I2C, Bluetooth, WiFi, IR.In one example of the present invention, the data of transmission can be position (as coordinate), identification result (as gesture code), order, sensing information or the available information of other controller 160.

In one example of the present invention, sensing information can be to control by processor 161 the initial sensing information (initial sensing information) producing, transfer to main frame 170 to carry out position analysis, for example position analysis, gesture judgement, order identification etc.In another example of the present invention, sensing information can be first to be analyzed by processor 161, then the position judging, gesture, order etc. are submitted to main frame 170.The present invention includes but be not limited to aforesaid example, those skilled in the art can know the interaction between other controller 160 and main frame 170 by inference.

At the crossover area of each bus, upper with under bus form the two poles of the earth.Each crossover area can be considered the pixel (pixel) in image (image), when having one or more external conductive objects to approach or touching, described image can be considered the image (if finger touches is in the aspect (pattern) of sensing apparatus) that photographs touching.

When driven bus is provided driving signal, driven bus itself forms self-capacitance (self capacitance), and each crossover area on driven bus forms mutual capacitance (mutual capacitance).The detecting of aforesaid self-capacitance formula is the self-capacitance of all buss of detecting, be specially adapted to judge single external conductive object near to or in contact with.

Aforesaid mutual capacitance type detecting, when driven bus is provided driving signal, by electric capacity or the capacitance change of all crossover areas on all sensed bus detecting driving bus with driven bus different dimensions arrangement, to be considered as the row pixel in image.Accordingly, the pixel of collecting all row forms described image.When having one or more external conductive objects to approach or during touching, described image can be considered the image that photographs touching, be specially adapted to judge a plurality of external conductive objects near to or in contact with.

Please refer to shown in Fig. 1 E, is a kind of aspect (pattern) of condenser type touch sensor, comprises a plurality of conducting strips (conductive plate) and many connecting lines.These connecting lines comprise many first connecting lines and many second connecting lines.These first connecting lines are with first direction (as one of horizontal or longitudinal) configuration, connect a part for these conducting strips, to form many buss of arranging towards first direction.Similarly, these second connecting lines are with second direction (as horizontal or longitudinal another) configuration, connect another part of these conducting strips, to form many buss of arranging towards second direction.

These buss (the first bus and the second bus) can be to consist of transparent or opaque material, for example, can be to consist of transparent tin indium oxide (ITO).Structurally can be divided into single layer structure (SITO; Single ITO) with double-decker (DITO; Double ITO).The ordinary person of the art can know the material of other bus by inference, is repeating no more.For example, carbon nanotube.

In example of the present invention, be to using longitudinally as first direction, and using laterally as second direction, therefore bus is the first bus longitudinally, and horizontal bus is the second bus.Those skilled in the art can know one of above-mentioned example that is illustrated as invention by inference, are not used for limiting the present invention.For example, can be to using laterally as first direction, and using longitudinally as second direction.

Fig. 1 F is the sectional view at I place in Fig. 1 E, comprise dielectric base 17 (substrate), the second bus a part (containing conducting strip 11, the second connecting line 12, conducting strip 13), insulation course 18, with a part (containing the first connecting line 15) and the insulation top layer 19 of the first bus.In one example of the present invention, substrate 17, insulation course 18 can be to form with transparent or opaque material with insulation top layer 19, as glass or plastic sheeting (film), those skilled in the art can know other constituted mode of this example by inference, do not repeat them here.

In one example of the present invention, Fig. 1 G is the sectional view at II place in Fig. 1 E, for a kind of structural representation of double-layer capacitance formula touch sensor, comprise dielectric base 17 (substrate), the second bus a part (containing the second connecting line 12), insulation course 18, with a part (containing conducting strip 14, the first connecting line 15, conducting strip 16) and the insulation top layer 19 of the first bus.

In one example of the present invention, Fig. 1 H is the sectional view at I place in Fig. 1 E, for a kind of structural representation of individual layer condenser type touch sensor, comprise dielectric base 17 (substrate), the second bus a part (containing the second connecting line 12), insulation course 18, with a part (containing conducting strip 14, the first connecting line 15, conducting strip 16) and the insulation top layer 19 of the first bus.The second connecting line 12 of the conducting

strip

14,15 of the first bus and the second bus is copline, and the first connecting line 15 strides across the second connecting line 12 in the mode of building bridge, and wherein 12 of the first connecting line 15 and the second connecting lines are completely cut off by insulation course 18.Those skilled in the art can know other bridge formation mode by inference, do not repeat them here., with respect to the upwards bridge formation mode of this example, can be for example the mode of building bridge downwards.

Please refer to Figure 1A, touching associated sensed information SA presents be the first finger A with driven bus, sensed bus between the variation of mutual capacitance coupling, and touching associated sensed information SB presents, be the variation that the mutual capacitance between the second finger B and sensed bus is coupled.

When approaching simultaneously or touching sensed bus due to the first finger A of same palm and the second finger B, just tactile signal may be reduced by the opposite signal of circulation between referring to, as shown in Figure 1B, the direct mode addressing this is that is that the signal that will be circulated to sensed bus between referring to reduces.Based on capacitively coupled degree, be meaning is that capacitively coupled degree C is directly proportional to capacitively coupled area A, and capacitively coupledly apart from d, is inversely proportional to.

Due between finger and sensed bus across one deck insulation top layer, one of mode therefore signal that is circulated to sensed bus between referring to being reduced is by the thickness increase of insulation top layer insulation meter layer.In one example of the present invention, insulation top layer can be skin glass, and suitable thickness is 1.1mm or more than 1.0mm.

Yet, because portable apparatus is more and more emphasized frivolous, the thickness of skin glass is also required more and more thinner, in one example of the present invention, the insulation top layer insulation meter layer thickness being required may be below 0.7mm, therefore in one example of the present invention, the another way that the signal that is circulated to sensed bus between referring to is reduced is that the area that exposes of sensed bus is reduced.

Please refer to Fig. 2 A, the first finger and the second finger of human body touches the first contact region P1 and the second contact region P2 of capacitive touch screen, the first contact region P1 covers the crossover area of the first bus Tx1 and the second bus Rx1, and the second contact region P2 covers the crossover area of the first bus Tx2 and the second bus Rx2.When the first bus Tx1 is provided driving signal SD, all the other first buss that comprise the first bus Tx2 are provided direct current signal, and each second bus is detected respectively.In one example of the present invention, the second bus of not yet being detected can be to be provided direct current signal.Described direct current signal can be to be provided by grounding circuit or the circuit that maintains direct current signal, and therefore in the present invention, the circuit that is coupled in grounding circuit or direct current signal can be to be provided direct current signal, as the circuit being grounded or the bus that is grounded.In like manner, being coupled in and providing the circuit of driving signal can be considered as being provided driving signal, is driven circuit, as driven bus.In addition, drive signal SD to be provided for many first buss, in a preferable example of the present invention, can be many adjacent buss, as two or three bus simultaneously.The bus of while drive part, can adaptability ground (adaptively) control (reinforcements) by the signal being detected by detecting bus, and can reduce when self-capacitance formula is detected the impact causing because being attached to the aqueous vapor that insulate on top layer or conducting particles.

In icon, while driving signal SD to be provided for the first bus Tx1, the finger of contact the first contact region P1 is for just tactile, and when driving signal SD to be provided for the first bus Tx2, the finger of contact the second contact region P2 is for just tactile.Similarly, cause negative tactile finger also can change with driving signal SD to be provided to the first different buss.For convenience of description, in following explanation, using just tactile finger as the first finger, causing the negative finger that touches effect is second finger.

Accordingly, be relevant to the first contact region P1 part, the capacitive couplings amount of formation comprises: capacitive couplings amount Cht1, the second bus Rx1 between the capacitive couplings amount Ctr1 between the first bus Tx1 and the second bus Rx1, the first bus Tx1 and the first finger H1 and the capacitive couplings amount Chr1 between the first finger H1.Similarly, be relevant to the second contact region P2 part, the capacitive couplings amount of formation comprises: the capacitive couplings amount Chr2 between the capacitive couplings amount Cht2 between the capacitive couplings amount Ctr2 between the first bus Tx2 and the second bus Rx2, the first bus Tx2 and second finger H2, the second bus Rx2 and second finger H2.

In addition, remain the capacitive couplings amount Chg between the health that is connected with second finger H2 at the first finger H1 and device, this value is generally between 10pf to 250pF, and the signal of wherein flowing through is Sg.

Therefore, when driving signal SD to be provided for the one or more the first bus Tx1, can be by the signal of each the second bus of detecting, represent or obtain the signal of the overlapping area that each second bus and the first bus Tx1 change mutually or change amount signal (change amount signal of the signal when not being touched).In like manner, can drive signal SD to other the first bus by providing, represent or obtain signal or the change amount signal of all overlapping areas.For example, by the second bus Rx1 and Rx2 sensing signal Sr1 and Sr2 respectively, can represent capacitively coupled amount on overlapping area, and the capacitively coupled amount comparison while not being touched with same overlapping area, change amount signal can be obtained.Therefore when having external conductive object (as finger) contact, can represent the position being touched by capacitively coupled amount or the variable quantity of these overlapping areas.Although capacitive couplings is in first bus and second bus respectively for the first finger H1 and second finger H2 in diagram, those skilled in the art can know by inference, and each finger can be that capacitive couplings is in many buss.

When driving signal SD not merely to flow out with signal Sr1, likely from bus, flowing out to external conductive object becomes signal S1, as flowed out to the first finger H1 by bus with capacitive couplings.All or part of becomes signal S1 signal Sg and with capacitive couplings, flow to ground or the ground of system by external conductive object, wherein a part of signal S1 may become the signal S2 external conductive object of flowing through and flow to bus with capacitive couplings, and for example flowing to the second bus becomes signal Sr2 or/and flow to the first bus that is provided direct current signal.

Therefore not only can detect the capacitively coupled variation of the overlapping area that represents that the first bus Tx1 and the second bus Rx1 change mutually, also can detect the capacitively coupled variation of the overlapping area that represents that the first bus Tx1 and the second bus Rx2 change mutually.On the overlapping area changing mutually due to the first bus Tx1 and the second bus Rx2, there is not actual capacitive couplings, yet but by the signal detecting, indicate capacitively coupled variation, form non-existent negative touching.Again because signal is to flow to second finger H2 by the first finger H1, the signal that the second bus Rx1 is detected with Rx2 presents contrary situation, during signal that the signal Sr1 of the true contact detecting as the second bus Rx1 is regarded as just touching, the signal Sr2 that the second bus Rx2 detects false contact can be considered as negative tactile signal.When if the first contact region P1 and corresponding the second bus of the second contact region P2 approach or the first contact region P1 and the second contact region P2 extend to identical the second bus, just touching with negative tactile signal and can cause the situation of cancelling out each other, likely making the signal gets too small of just touching and cannot be detected.When negative tactile quantity is more, this situation is obvious, even likely just tactile signal cancellation is become to negative tactile signal.With impedance/electrovolumetric analysis, at the second contact region P2, to being provided the electric capacity of the circuit of direct current signal, be Chg+Cht2 (while being provided driving signal because of the first bus Tx1, the first bus Tx2 is provided direct current signal (as ground connection)), negative tactile signal and the electric capacity of the second bus Rx2 are Chr2.So negative tactile and just tactile ratio GTR=(Chr2)/(Chg+Cht2).Negative tactile and just tactile ratio GTR is less, and negative tactile signal is less with the effect of just tactile signal cancellation.Remove or reduce the negative signal that touches and align tactile caused impact, capable of regulating is provided the area of the circuit of direct current signal, make second finger H2 near to or in contact with time, most contact range all covers on the circuit (driving the first bus of signal as not being provided) that is provided direct current signal.

Solve because just touching with negative tactile signal cancellation and cause the method for just touching erroneous judgement, will bear as much as possible to touch signal reduction, the most direct way, is exactly by the distance strengthening between external conductive object and the second bus, as strengthened the distance between second finger H2 and the second bus Rx2.In one example of the present invention, when insulation top layer is the about 1.1mm of distance between glass and second finger H2 and the second bus Rx2, can effectively solve single just touching and the single problem of bearing tactile signal cancellation.Yet, when the problem facing is single just touching with a plurality of negative while touching signal cancellation, may the distance between finger and the second bus be added to larger.Apparently, just can tolerate touch can not cause with negative tactile signal cancellation the limited ability that just touching position erroneous judgement in point and the second bus between distance, such distance is difficult to be less than 0.7mm.Therefore, the negative signal that touches be reduced as far as possible, just the distance between finger and the second bus must be strengthened as far as possible.Yet, on this and market, wish that the demand that capacitive touch screen is more and more thinner runs in the opposite direction.

By negative touching with just tactile ratio GTR proposed by the invention, can be learnt, GTR=(Chr2)/(Chg+Cht2), reduce the impact (hereinafter to be referred as the negative effect of touching) of just touching with negative tactile signal cancellation, capacitive couplings amount Chr2 between the second bus and finger need to be reduced, and/or the capacitive couplings amount (Chg+Cht2) of pointing and being coupled between direct current signal circuit is increased.

Accordingly, in one example of the present invention, many first buss of a bus aspect and many mutual crossovers of the second bus and mutually expose, and the area that the first described bus exposes is greater than the area that the second described bus exposes.In another example of the present invention, externally shaping claviform near to or in contact with one when effectively the capacitive couplings scope of contact is large enough to be judged out a position, the area that bus aspect makes to cover in capacitive couplings scope or capacitive couplings is exposed in the first bus is greater than and covers or area that capacitive couplings is exposed in the second bus.The area that for example the second bus exposes is less than half of area that the first bus exposes, and capacitive couplings scope is greater than the area of each crossover area.At the first bus and when the second bus is covered with or convergence is covered with the active region (active area) of capacitive touch screen, such bus aspect impel the area that capacitive couplings scope covers or capacitive couplings is exposed in the first bus across any effective contact of a plurality of crossover areas be greater than the area that exposes in the second bus of covering or capacitive couplings.

Aforesaid external conductive object is to be greater than when pre-conditioned and to cause effective touching in contact range, and wherein effectively touching can be facilitated signal or the change amount signal that is enough to judge position, and preset range can be width (length), area etc.For example the maximum of contact range or minimum widith are greater than pre-conditioned or area and are greater than pre-conditioned.Therefore, in single layer structure, the capacitive couplings amount of second finger H2 and the second bus by be less than and direct current signal between capacitive couplings amount.

In addition, in double-decker, the first bus is positioned at upper strata, and the second bus is positioned at lower floor, that is the first bus is positioned at the one deck that approaches external conductive object.Therefore, at any external conductive object, to the contact range of this capacitive touch screen, be greater than pre-conditioned and form effectively touching, and when the area that contact range covers the first bus is more than or equal to contact range and covers the area of the second bus, the capacitive couplings amount of second finger H2 and the second bus by be less than and direct current signal circuit between capacitive couplings amount.

In the prior art, the capacitive couplings amount of not guaranteeing second finger H2 and the second bus be less than and direct current signal circuit between the situation of capacitive couplings amount under, the quantity of second finger H2 is more, and the signal that is flowed into the second bus by the capacitive couplings of two finger H2 and the second bus is more.

Please refer to Fig. 2 B, is the negative schematic diagram that touches signal S2 inflow bus, and the impedance R in diagram represents that the negative signal S2 of touching flows into the impedance before bus.Because drive signal capacitive couplings in the signal of the first finger H1 can via second finger H2 form with the capacitive couplings Cr of the second bus and with the capacitive couplings Cg that is provided the circuit (as not being provided the first bus that drives signal) of direct current signal, and form and flow in the signal Ir of the second bus and the signal Ig of the circuit that inflow is provided direct current signal respectively.Apparently, drive signal at capacitive couplings the second bus and circuit that is provided direct current signal of flowing in parallel after the first finger H1, when second finger H2 increases, relatively the amount of capacitive couplings Cr and Cg also can increase.If the amount that capacitive couplings Cr increases is greater than the amount that capacitive couplings Cg increases, because resistance and electric capacity are inversely proportional to, signal Ir will increase, and signal Ig will reduce, that is bear tactile effect increase.

Therefore, along with causing, the quantity of negative tactile second finger H2 is more, and the distance between the second bus and second finger H2 also must be larger, need to be thicker as insulation top layer, could tolerate negative impact of touching effect, the unlikely erroneous judgement that causes just tactile position.Yet the thickening of insulation top layer is contrary with the target of capacitive touch screen attenuation.

Accordingly, in one example of the present invention, reducing the negative technological means of touching effect is to adopt a kind of bus aspect, the contact range of effectively touching be greater than pre-conditioned under, the design of bus aspect is to be greater than pre-conditioned contact range and to cover exposing area and must being greater than the area that exposes that covers the second bus of the first bus based on any.Therefore when the quantity of second finger H2 increases, the amount that capacitive couplings Cg increases is greater than the amount that capacitive couplings Cr increases, and because resistance and electric capacity are inversely proportional to, signal Ig will increase, and signal Ir will reduce, that is bears tactile effect minimizing.

Under the pattern of the best of the present invention, the first bus is to be positioned at double-deck upper strata, and the second bus is to be positioned at double-deck lower floor.

According to above-mentioned, the many touch-screens of a kind of mutual capacitance type that provide in the present invention's one example, the aspect of described bus facilitates each external conductive object to be greater than when pre-conditioned the contact range of the many touch-screens of this mutual capacitance type, each external conductive object capacitive couplings is greater than capacitive couplings in the amount of the second described bus in the amount of the first described bus, thereby make to drive signal to flow out after described bus again by least one the first external conductive object in described external conductive object the ratio that the second external conductive object of at least one in described external conductive object flows into the second described bus, along with the quantity of the second described external conductive object increases and reduces.

In the present invention, with capacitive couplings, flow out under the condition that the semaphore of bus is identical, the quantity of second finger H2 is more, and the signal that is flowed into the second bus by the capacitive couplings of two finger H2 and the second bus is fewer.Under this condition, as long as the thickness on insulation top layer can be tolerated the negative tactile impact that a second finger H2 causes, be also equal to the negative tactile impact that can tolerate that more second finger H2 cause.The negative tactile impact of above-mentioned tolerance refers to while there is negative the touching that one or more second finger H2 cause, still can be by each just tactile correct position judgement.

According to above-mentioned, when capacitive touch screen is while being opaque, for example, during as mobile computer touch-control indicator device (touch pad), sensed bus (as the second bus) is attenuated, also can reduce the negative effect of touching.But if sensed bus is too sparse, when finger is tiltedly drawn straight line, represent that a succession of coordinate of finger position may be the jagged oblique line of line, the configuration of sensed bus is more sparse, and jagged degree is more serious.

In addition, for example, when capacitive touch screen while being transparent while forming touch-sensitive display (touch sensitive display) (be covered in display), for penetrability can be tried one's best evenly, wire bar on capacitive touch screen needs to be evenly covered with as much as possible the active region (active area) on capacitive touch screen, for example, shown in Fig. 1 E.Although the conducting strip in diagram is rhombus, it can also be the polygons such as hexagon, octagon that those skilled in the art can know conducting strip by inference, or other geometric figure.

Please refer to shown in Fig. 3 A to Fig. 3 D, is a kind of capacitive touch screen proposing according to an example of the present invention, in order to detect approaching or touching of external conductive object.Capacitive touch screen comprises that many first buss 31 and many second bus 32, the first buss 31 expose mutually with the second bus 32 and is separated.

Described the first bus 31 is to be operatively provided driving signal while detecting for mutual capacitance type, wherein each first bus 31 is comprised of many a plurality of the first conducting strips 33 of the first connecting line 35 series connection, and every a slice the first conducting strip 33 is the outstanding Extendible flakes 37 in every one side by four limits of square or rhombus.In a preferable example of the present invention, Extendible flake 37 is triangle, makes the first conducting strip 33 become ten hexagons.The technician that the art has common knowledge can know by inference, and Extendible flake 37 can be also rectangle, rhombus or other polygon.

The second described bus 32 provides mutual capacitance coupled signal, wherein each second bus 32 is comprised of many a plurality of the second conducting strips 34 of the second connecting line 36 series connection, and every a slice the second conducting strip 34 is the sinking space 38 of every one side depression by four limits of square or rhombus.Wherein, one of accommodating described Extendible flake 37 of each sinking space 38.In a preferable example of the present invention, sinking space 38 is triangle, makes the second conducting strip 34 become ten hexagons.The technician that the art has common knowledge can know by inference, and sinking space 38 can be also rectangle, rhombus or other polygon.

In an optimal mode of the present invention, the first conducting strip 33 is for to have the square of Extendible flake 37 or ten hexagons that rhombus extends out formation, and the second conducting strip 34 inside contracts ten hexagons of formation for having sinking space 38 squares or rhombus.

The space of exposing that described the first bus 31 and the second bus are 32 can be to have a plurality of isolated the 3rd conducting strips 39 (dummy pad), and described conducting strip 39 can be identical material with the first described bus 31.In addition, described conducting strip 39 can be identical material with the second described bus 32.

In one example of the present invention, the area that each first conducting strip 33 is removed described Extendible flake 37 equals the area that each second conducting strip 34 adds the above sinking space 38, and the area that described the first conducting strip 33 is exposed is greater than the area of described the second conducting strip 34.In another example of the present invention, the area that each first conducting strip 33 is removed described Extendible flake 37 is less than the area that each second conducting strip 34 adds the above sinking space 38, and the area that described the first conducting strip 33 is exposed is greater than the area of described the second conducting strip 34.In fact, area and each second conducting strip 34 of the described Extendible flake 37 of each first conducting strip 33 removal add the area that the area differing between the area of the above sinking space 38 is about or equals to be surrounded on each second conducting strip 34 the 3rd conducting strip 39 around.

In addition,, in one example of the present invention, capacitive touch screen is to adopt single layer structure (SITO; Single ITO).Described the first conducting strip 33 is in the same plane with described the second conducting strip 34.Each first connecting line 35 strides across one of described second connecting line 36 or each the second connecting line 36 strides across one of described first connecting line 35, and the first connecting line 35 of its centre-exchange-meeting and 36 of the second connecting lines are insulated thing (not showing in diagram) and separate.

In another example of the present invention, capacitive touch screen is to adopt double-decker (DITO; Double ITO).Not at grade, the second described 34 of conductions of wherein said the first bus 33 approach external conductive object for described the first conducting strip 33 and described the second conducting strip 34.

In addition, in one example of the present invention, aforesaid the first conducting strip 33 and the second conducting strip 34 do not comprise the first bus 31 and the second bus 32 incomplete conducting strips in two ends.The first bus 31 two ends are respectively the first conducting strip half, also belong to a part for the first bus, by the first connecting line 35, are connected to the first conducting strip 33.Similarly, be respectively the second conducting strip half with the second bus 32 two ends.By the second connecting line 36, be connected to the second conducting strip 34.

In another example of the present invention, capacitive touch screen can also comprise that Yu Liangtiao second side, both sides bus that two first side buss lay respectively at described the first bus lays respectively at the both sides of described the second bus, wherein each first side bus is comprised of many first connecting lines a plurality of half sheet the first conducting strips of connecting, and each second side bus is comprised of many second connecting lines a plurality of half sheet the second conducting strips of connecting.

Aforesaid driving signal is AC signal, can be string ripple (as sin wave) or square wave (as PWM).

Please refer to Fig. 4, in an optimal mode of the present invention, capacitive touch screen 40 is rectangular, has two relative long limits 42 and two relative minor faces 41, wherein said the first bus 31 is parallel with minor face 41, and the second described bus 32 is parallel with long limit 42.In other words, capacitive touch screen is rectangular, have two relative long limits 42 and two relative minor faces 41, wherein said the first bus 31 is arranged in parallel with two minor faces 41 41 of two minor faces, and the second described bus 32 is arranged in parallel on 42, two long limit and two long limits 42.In one example of the present invention, the quantity of the first bus 31 is greater than the quantity of the second bus 32.In other words, the quantity that is provided the first bus 31 that drives signal is greater than the quantity of the second bus 32 that mutual capacitance coupled signal is provided.

As discussed previously, the mutual capacitance coupled signal that the second bus 32 provides can be to provide to controller 160, and controller 160 can be integrated circuit (IC, integrated ciucuit).Control circuit 160 provides above-mentioned driving signal, and by described the second bus 32, receives described mutual capacitance coupled signal when at least one bus 31 is provided driving signal.Accordingly, the present invention adopts controller 160 and capacitive touch screen to form a kind of device of tool capacitive touch screen.

In one example of the present invention, mutual capacitance coupled signal is to be received simultaneously, needs the element of equal number to receive mutual capacitance coupled signal.By minor face, be connected to the second described bus 32 and be better than being connected to the first described bus 31 from long limit, because can receive with less element mutual capacitance coupled signal, to obtain image.

In another example of the present invention, described the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-1 difference according to described mutual capacitance coupled signal, and each difference is that the mutual capacitance coupled signal of a pair of adjacent the second bus of foundation respectively subtracts each other to produce.

In another example of the present invention, described the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-2 two difference according to described mutual capacitance coupled signal, and each two difference is according to the difference of mutual capacitance coupled signal of front two electricity two buss and the difference of the mutual capacitance coupled signal of rear two electricity two buss in three the second adjacent buss, to subtract each other to produce respectively.

Suitable owing to being subject to coming from the noise of display between adjacent bus, therefore the signal difference producing after the signal of the second adjacent bus 32 is received simultaneously can be offset the noise that major part comes from display, therefore can not need between capacitive touch screen, adds last layer back of the body shield layer (shielding layer).When general driving signal is provided, back of the body shield layer is provided maybe this driving signal of DC potential, to shield the noise from display.

According to aforementioned, the invention provides a kind of method for detecting of capacitive touch screen, in order to detect approaching or touching of external conductive object, as shown in Figure 5.First, as shown in step 510, provide above-mentioned capacitive touch screen, rectangular, there are two relative long limits and two relative minor faces.Capacitive touch screen comprises many first buss and many second buss.Described the first bus is operatively provided driving signal while detecting for mutual capacitance type, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is that wherein said the first bus is parallel with minor face by the outstanding Extendible flake in every one side on four limits of square or rhombus.Described the second bus provides mutual capacitance coupled signal, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is that wherein said the second bus is parallel with long limit by a sinking space of every one side depression on four limits of square or rhombus.Next, as shown in step 520, by long limit, provide and drive signal at least one the first buss, and at minor face, by described the second bus, receive aforementioned mutual capacitance coupled signal when at least one the first buss are provided this driving signal.

The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims

1. a method for detecting for capacitive touch screen, in order to detect approaching or touching of external conductive object, is characterized in that it comprises:

Capacitive touch screen is provided, rectangular, there are two relative long limits and two relative minor faces, comprising:

During for mutual capacitance type detecting, be operatively provided many first buss that drive signal, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is that wherein said the first bus is parallel with minor face by the outstanding Extendible flake in every one side on four limits of square or rhombus; And

Many the second buss of mutual capacitance coupled signal are provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is that wherein said the second bus is parallel with long limit by a sinking space of every one side depression on four limits of square or rhombus; And

This driving signal is provided, and by described the second bus, receives described mutual capacitance coupled signal when at least one bus is provided this driving signal;

By long limit, provide and drive signal at least one the first buss, and at minor face, by described the second bus, receive aforementioned mutual capacitance coupled signal when at least one the first buss are provided this driving signal.

2. a device for tool capacitive touch screen, in order to detect approaching or touching of external conductive object, is characterized in that it comprises:

Capacitive touch screen:

During for mutual capacitance type detecting, be operatively provided many first buss that drive signal, wherein each first bus is comprised of many first connecting lines a plurality of the first conducting strips of connecting, and every a slice the first conducting strip is the outstanding Extendible flake in every one side by four limits of square or rhombus; And

Many the second buss of mutual capacitance coupled signal are provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is the sinking space of every one side depression by four limits of square or rhombus; And

Control circuit, provides this driving signal, and by described the second bus, receives described mutual capacitance coupled signal when at least one bus is provided this driving signal;

One of wherein said the first bus mutually exposes with described the second bus and is separated, and the accommodating described Extendible flake of each sinking space.

3. the device of tool capacitive touch screen according to claim 2, it is characterized in that each first conducting strip removes the area of described Extendible flake and be equal to or greater than the area that each second conducting strip adds the above sinking space, the area that described the first conducting strip is exposed is greater than the area of described the second conducting strip.

4. the device of tool capacitive touch screen according to claim 2, is characterized in that described the first conducting strip and described the second conducting strip are in the same plane.

5. the device of tool capacitive touch screen according to claim 2, is characterized in that the quantity of described the first bus is greater than the quantity of described the second bus.

6. the device of tool capacitive touch screen according to claim 2, it is characterized in that each first connecting line strides across one of described second connecting line or each the second connecting line strides across one of described first connecting line, between the first connecting line of its centre-exchange-meeting and the second connecting line, be insulated thing and separate.

7. the device of tool capacitive touch screen according to claim 2, is characterized in that described the first conducting strip and described the second conducting strip not at grade, and the second described bus of wherein said the first bus approaches external conductive object.

8. the device of tool capacitive touch screen according to claim 7, is characterized in that this capacitive touch screen also comprises that insulation course is between described the first bus and described the second bus.

9. the device of tool capacitive touch screen according to claim 2, it is characterized in that it also comprises display, wherein between this display and described the second conducting strip, do not exist and be provided the maybe back of the body shield layer of this driving signal of a DC potential, wherein this DC potential maybe this driving signal be to be provided when described the second bus provides described mutual capacitance coupled signal.

10. the device of tool capacitive touch screen according to claim 2, is characterized in that described the first conducting strip and described the second conducting strip not at grade, and the first described bus of wherein said the second bus approaches this display.

The device of 11. tool capacitive touch screens according to claim 2, it is characterized in that this capacitive touch screen is rectangle, there are two relative long limits and two relative minor faces, wherein said the first bus is arranged in parallel with two minor faces between two minor faces, and the second described bus is arranged in parallel with two long limits between two long limits.

The device of 12. tool capacitive touch screens according to claim 2, it is characterized in that Yu Liangtiao second side, both sides bus that this capacitive touch screen also comprises that two first side buss lay respectively at described the first bus lays respectively at the both sides of described the second bus, wherein each first side bus is comprised of many first connecting lines a plurality of half sheet the first conducting strips of connecting, and each second side bus is comprised of many second connecting lines a plurality of half sheet the second conducting strips of connecting.

The device of 13. tool capacitive touch screens according to claim 2, it is characterized in that described the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-1 difference according to described mutual capacitance coupled signal, and each difference is that the mutual capacitance coupled signal of a pair of adjacent the second bus of foundation respectively subtracts each other to produce.

The device of 14. tool capacitive touch screens according to claim 2, it is characterized in that described the second bus is sequentially arranged in parallel, and there is N bar, N is natural number, wherein control circuit produces N-2 two difference according to described mutual capacitance coupled signal, and each two difference is according to the difference of mutual capacitance coupled signal of front two electricity two buss and the difference of the mutual capacitance coupled signal of rear two electricity two buss in three the second adjacent buss, to subtract each other to produce respectively.

The device of 15. tool capacitive touch screens according to claim 2, it is characterized in that the space of exposing between described the first bus and described the second bus exists a plurality of the 3rd isolated conducting strips, described conducting strip is identical material with the first described bus.

The device of 16. tool capacitive touch screens according to claim 2, is characterized in that it also comprises display, does not exist shielding from the back of the body shield layer of the noise of display between described the first bus and display.

The device of 17. tool capacitive touch screens according to claim 1, it is characterized in that described the first conducting strip is to have the square of leg-of-mutton Extendible flake or ten hexagons that rhombus extends out formation, and described the second conducting strip is to have ten hexagons that leg-of-mutton sinking space square or rhombus inside contract formation.

18. 1 kinds of capacitive touch screens, in order to detect approaching or touching of external conductive object, is characterized in that it comprises:

Many the second buss of mutual capacitance coupled signal are provided, wherein each second bus is comprised of many second connecting lines a plurality of the second conducting strips of connecting, and every a slice the second conducting strip is the sinking space of every one side depression by four limits of square or rhombus;

19. capacitive touch screens according to claim 18, it is characterized in that each first conducting strip removes the area of described Extendible flake and equal the area that each second conducting strip adds the above sinking space, the area that described the first conducting strip is exposed is greater than the area of described the second conducting strip.

20. capacitive touch screens according to claim 18, is characterized in that described the first conducting strip and described the second conducting strip are in the same plane.

21. capacitive touch screens according to claim 18, is characterized in that the quantity of described the first bus is greater than the quantity of described the second bus.

22. capacitive touch screens according to claim 18, it is characterized in that each first connecting line strides across one of described second connecting line or each the second connecting line strides across one of described first connecting line, between the first connecting line of its centre-exchange-meeting and the second connecting line, be insulated thing and separate.

23. capacitive touch screens according to claim 18, is characterized in that described the first conducting strip and described the second conducting strip not at grade, and the second described bus of wherein said the first bus approaches external conductive object.

24. capacitive touch screens according to claim 18, it is characterized in that its Yu Liangtiao second side, both sides bus that also comprises that two first side buss lay respectively at described the first bus lays respectively at the both sides of described the second bus, wherein each first side bus is comprised of many first connecting lines a plurality of half sheet the first conducting strips of connecting, and each second side bus is comprised of many second connecting lines a plurality of half sheet the second conducting strips of connecting.

The device of 25. tool capacitive touch screens according to claim 18, it is characterized in that described the first conducting strip is to have the square of leg-of-mutton Extendible flake or ten hexagons that rhombus extends out formation, and described the second conducting strip is to have ten hexagons that leg-of-mutton sinking space square or rhombus inside contract formation.