CN103345342B - Capacitance touch screen terminal and touch detecting system thereof - Google Patents

The present invention is applicable to technical field of touch control, it is provided that a kind of capacitance touch screen terminal and touch detecting system thereof.This touch detecting system includes: some first electrode blocks, have at least two drive the driving signal generator module of signal output part, detection module, two latitude coordinates locating modules；The most each first electrode block can form capacitive node with induction electrode block or ground, has at least two signal input part, each first electrode block is divided at least one sub-electrode block；This driving signal generator module is driven according to time ordered pair the first electrode block preset, and makes each position at least one sub-electrode block have different signal intensitys.The present invention utilizes the coordinate driving the strong and weak change of signal to position one-dimensional degree between detection node, this technology is applied to the capacitive touch screen of monolayer wiring, required drive electrode block or the quantity of detecting electrode can be greatly reduced, therefore overall routing greatly reduces, also reduce technology difficulty, also improve the linearity of coordinate.

Capacitance touch screen terminal and touch detecting system thereof

Technical field

The invention belongs to technical field of touch control, particularly relate to a kind of capacitance touch screen terminal and touch detecting system thereof.

Background technology

Touch screen technology is simple as one, nature, easily input mode, has been widely used in each Terminal Type, Resistive touch screen, capacitive touch screen, infrared touch panel etc., wherein capacitance touch is particularly may be divided into according to realizing principle Screen is extensively pursued due to complex operations such as recognizable multiple point touchings.

Capacitive touch screen is divided into again mutual capacitance and self-capacitance two types.Either mutual capacitance or self-capacitance, it passes The traditional design of sensor or monolayer wiring can not be realized, or need a lot of connecting line.Manufacturing process is complicated, relatively costly.

Summary of the invention

The technical problem to be solved is to provide a kind of capacitance touch screen terminal and touch detecting system, purport Simplifying capacitive touch screen wiring.

The present invention is achieved in that the touch detecting system of a kind of capacitance touch screen terminal, including: some first electrodes Block, have at least two drive the driving signal generator module of signal output part, detection module, first latitude coordinates location mould Block, the second latitude coordinates locating module；

Each first electrode block can form capacitive node with induction electrode block or ground, and it has the input of at least two signal End；Each first electrode block is divided at least one sub-electrode block by described at least two signal input part, and drives with described respectively The driving signal output part of dynamic signal generator module connects one to one, and the signal input of each the first electrode block same order End short circuit is in corresponding driving signal output part；

Described at least two drives signal output part to be driven according to the first electrode block described in ordered pair time default, make to Each position on a few sub-electrode block has different signal intensitys；

Described detection module is for detecting each capacitive node initial data under different driving signal；

Described first latitude coordinates locating module is embodied for described raw sensor data and benchmark data are done difference The detection data of touch signal, then carry out interpolation between each capacitive node adjacent detection data, orient the position that is touched Coordinate in the first dimension；

Described second latitude coordinates locating module is for orienting the position coordinate in the second dimension that is touched.

Further, also include that some induction electrode blocks, described first electrode block are drive electrode block, some described drivings With some described induction electrode blocks alternately, adjacent drive electrode block forms capacitive node with induction electrode block to electrode block； Described detection module is connected with some described induction electrode blocks, exists for detecting each capacitive node by described induction electrode block Initial data under different driving signal；Described second latitude coordinates locating module is for by described raw sensor data and benchmark Data are done difference and are obtained embodying the detection data of touch signal, then carry out interpolation between the detection data of adjacent induction electrode block, Orient the position coordinate in the second dimension that is touched.

Further, described first electrode block forms capacitive node as detecting electrode with ground；Described second latitude coordinates Locating module, for interpolation between the detection data of adjacent detecting electrode, orients the position seat in the second dimension that is touched Mark.

Present invention also offers a kind of capacitance touch screen terminal comprising touch detecting system as above.

The touch location technology that the present invention provides utilizes the strong and weak change driving signal between detection node to carry out the elements of a fix, will This technology is applied to the capacitive touch screen of monolayer wiring, and can greatly reduce required drive electrode block (is inspection from hold correspondence Survey electrode) quantity, therefore overall routing greatly reduces, and also reduces technology difficulty, the linearity of the coordinate also improved.

Accompanying drawing explanation

The schematic wiring diagram of the self-tolerant touch screen that Fig. 1 present invention provides；

Fig. 2 is the structure chart of the touch detecting system being applicable to self-tolerant touch screen that the present invention provides；

Fig. 3 is the mutual capacitance touchscreens schematic wiring diagram that first embodiment of the invention provides；

Fig. 4 is the equivalent resistance figure of the mutual capacitance touchscreens wiring shown in Fig. 3；

Fig. 5 A applies to the structure chart of the touch detecting system of mutual capacitance touchscreens shown in Fig. 4；

Fig. 5 B is the driver' s timing figure of touch detecting system shown in Fig. 5 A；

Fig. 6 is the mutual capacitance touchscreens schematic wiring diagram that second embodiment of the invention provides；

Fig. 7 is the mutual capacitance touchscreens schematic wiring diagram that third embodiment of the invention provides；

Fig. 8, Fig. 9 are the mutual capacitance touchscreens schematic wiring diagram that fourth embodiment of the invention provides；

Figure 10 is the mutual capacitance touchscreens schematic wiring diagram that fifth embodiment of the invention provides；

Figure 11 is the mutual capacitance touchscreens schematic wiring diagram that sixth embodiment of the invention provides；

Figure 12 is the mutual capacitance touchscreens schematic wiring diagram that seventh embodiment of the invention provides；

Figure 13 is the mutual capacitance touchscreens schematic wiring diagram that eighth embodiment of the invention provides；

Figure 14 is the mutual capacitance touchscreens schematic wiring diagram that ninth embodiment of the invention provides；

Figure 15 is the mutual capacitance touchscreens schematic wiring diagram that tenth embodiment of the invention provides；

Figure 16 is the mutual capacitance touchscreens schematic wiring diagram that eleventh embodiment of the invention provides；

Figure 17 is the self-capacitance touch screen schematic wiring diagram that twelveth embodiment of the invention provides；

Figure 18 is the self-capacitance touch screen schematic wiring diagram that thriteenth embodiment of the invention provides；

Figure 19 is the self-capacitance touch screen part schematic wiring diagram that fourteenth embodiment of the invention provides；

Figure 20 is the self-capacitance touch screen part schematic wiring diagram that fifteenth embodiment of the invention provides；

Figure 21 is the self-capacitance touch screen part schematic wiring diagram that sixteenth embodiment of the invention provides.

Detailed description of the invention

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

The size of the driving voltage corresponding from each electrode block in traditional touch location technology is that single value is different, this In the touch location technology of bright offer, each detection node on the capacitive node that same electrode block is formed has different driving Dynamic signal intensity so that when finger or felt pen touch diverse location, obtain different detection data, according to each detection joint The situation of change of some detection data, can orient which capacitive node concrete and be touched.

Based on above-mentioned principle, details are as follows for the flow process that realizes of the touch localization method that the present invention provides:

Step A, is driven electrode block, makes each position on sub-electrode block have different signal intensitys.This electricity Pole block forms capacitive node with induction electrode block or ground, and electrode block has at least two driving signal input, and these drive letter Electrode block is divided at least one sub-electrode block by number input.

Exchange or pulsating direct current mode specifically can be used to be driven, such as, for there being three to drive on same electrode block For the application of dynamic signal input part, each scan period can be divided into t₀、t₁、t₂Three time periods, such as Fig. 5 B, t₀Moment to First driving signal input D of electrode block₀Input peak-to-peak value is the sine wave drive signal of 3.3V, D₁、D₂Ground connection, t₁Moment To the second driving signal input D of electrode block₁Input peak-to-peak value is the sine wave drive signal of 3.3V, D₀、D₂Ground connection, t₂Time Carve the 3rd driving signal input D to electrode block₂Input peak-to-peak value is the sine wave drive signal of 3.3V, D₀、D₁Ground connection.

Step B, obtains each capacitive node respectively at t₀、t₁、t₂The detection data in moment, and pass through between detection data Interpolation obtains the position being touched.

It is for instance possible to use the barycentric interpolation method being shown below obtains the position that is touched.

X = Σ i = 0 i = 2 X i * D i Σ i = 0 i = 2 D i

X_iRepresent signal input part D_iThe actual coordinate value of position, D_iRepresent t_iDetection data obtained by moment.

Above-mentioned electrode block structure is extended, this localization method can be applied to self-capacitance and mutual capacitance touchscreens On.Wherein Fig. 1, Fig. 2 set corresponding to the electrode of mutual capacitance corresponding to the electrode design of self-capacitance touch screen, Fig. 3, Fig. 4, Fig. 5 A Meter, the black bars 201 on drive electrode block D0 in Fig. 4, Fig. 5 A represents the equivalent resistance distribution of electrode block.

In the lump with reference to Fig. 2 to Fig. 5 A, the touch detecting system of the capacitance touch screen terminal that the present invention provides includes: Ruo Gan One electrode block D, driving signal generator module 302, detection module 301 and the first latitude coordinates locating module 305 and the second dimension Degree coordinate setting module 306, wherein, drives signal generator module 302 to have at least two and drives signal output part.

First electrode block is one of electrode of a capacitive node, can form capacitive node with induction electrode block or ground, each First electrode block has at least two signal input part, each first electrode block is divided into some sub-electrode blocks, respectively with driving The driving signal output part of signal generator module 302 connects one to one.Self-capacitance node as shown in Figure 2, each first electricity Pole block has two signal input parts, such as three signal input parts on the first electrode block of the leftmost side are respectively S₀、S₄, Three signal input parts on first electrode block on right side are respectively S_n+1、S_n+3, the most each first electrode block only has one Sub-electrode block, these two signal input parts are connected to drive two driving signal output parts of signal generator module 302.Equally For the mutual capacitance node shown in Fig. 5 A, each first electrode block has tri-signal input parts of D0, D1, D2, is respectively connecting to Driving three driving signal output parts of signal generator module 302, each first electrode block is divided into two son electricity by D0, D1, D2 Pole block.And the signal input part short circuit of each the first electrode block same order is in corresponding driving signal output part, such as, will 1st signal input part short circuit of each the first electrode block drives signal output part in drive signal generator module 302 the 1st, will 2nd signal input part short circuit of each the first electrode block drives signal output part in drive signal generator module 302 the 2nd, with This analogizes.Should be appreciated that Fig. 2 and Fig. 5 A respectively by two, illustrate as a example by three signal input parts, specifically can also design Become the signal input part of other numbers.

For the self-capacitance node shown in Fig. 1, Fig. 2, the first electrode block forms capacitive node as detecting electrode and ground, and For the mutual capacitance node shown in Fig. 3 to Fig. 5 A, the first electrode block D0 is as drive electrode block and induction electrode block S0, S1, S2 Forming capacitive node, drive signal generator module 302 to be driven the first electrode block, make at least one sub-electrode block is each Individual position has different signal intensitys.

Detection module 301 is for detecting the initial data of each capacitive node, then by the first latitude coordinates locating module 305 and second latitude coordinates locating module 306 raw sensor data and benchmark data done difference obtain embodying the inspection of touch signal Survey data, the first latitude coordinates locating module 305 each capacitive node each detection data between carry out interpolation, orient by Touch location coordinate in the first dimension.And the second latitude coordinates locating module 306 relocates out the position that is touched second Coordinate (above-mentioned interpolation method can be used equally to position) in dimension.

For mutual capacitance, the first electrode block D is drive electrode block, some drive electrode blocks and some induction electrode blocks Alternately, detection module 301 is connected with some induction electrode blocks, exists for detecting each capacitive node by induction electrode block Detection data the most in the same time.

In the present invention, by the impedance design on drive electrode block and induction electrode block or detecting electrode for being uniformly distributed, with Make pressure drop and linearly change with reference to ratio, it is simple to touching detection calculations.

In sum, every induction electrode synchronization is only able to detect data, the size of these data and finger Or the concrete touch location that felt pen is on corresponding capacitive node (drive, sense or pin drive sensing can) has simultaneously Close, also relevant with contact area, simultaneously the most relevant with the stiffness of coupling of human body or felt pen and detection circuitry ground.Just because of Not the most relevant to position for detected value, so just needing plural detecting electrode, obtaining plural detection Data, utilize interpolation algorithm to remove other factors, obtain touching position information.

The present invention is also respectively directed to mutual capacitance and self-capacitance provides concrete electrode design pattern, and details are as follows.

For mutual capacitance:

Induction electrode block and drive electrode block in Fig. 3 to Fig. 5 A are both designed as strip, can flexible design be the most also Other are variously-shaped, see shown in Fig. 6 to Figure 16 respectively, are described the most respectively.It should be noted that, at Fig. 3 to Figure 16 Middle drive electrode block, induction electrode block all can be laid in the same face of substrate, form monolayer wiring, and driver' s timing is then such as Fig. 5 B Shown in, drive signal generator module 302 that each drive electrode is sequentially scanned, drive to a signal input part input in each moment Dynamic signal, and do not have the signal input part driving signal input to connect fixed voltage, such as, t₀Time-ofday signals input D0 is for driving Signal, and D1, D2 connect fixed voltage (), at t₁And t₂It is then D1 and D2 input drive signal respectively, the remaining two fixing electricity of termination Pressure ().This driver' s timing can equally be well applied to self-capacitance, only drives signal generator module 302 to apply detecting electrode Drive signal.

Embodiment two, as shown in Figure 6, drive electrode block D0 and induction electrode block S0 is transversely arranged to induction electrode block Sn. Induction electrode block 402 is rectangular shape, drive electrode block 401 in wavy, and crest 403 and trough 404 respectively with the sensing of both sides Electrode block 402 is neighbouring.The wavy of drive electrode block 401 can be triangular wave, square wave, sawtooth waveforms or other similar ripple Shape.(distance between crest and crest or trough and trough and ripple is i.e. adjusted by stretching or compressible drive electrode block 401 Height between peak from trough) different impedances can be obtained.

Embodiment three, as it is shown in fig. 7, drive electrode block 401 is in wavy, and crest 403 and trough 404 respectively with both sides Induction electrode block 402 is neighbouring；Induction electrode block includes a strip electrode 501, if strip electrode 501 along it vertically to stretching out Dry induction electrode tooth 502, and induction electrode tooth 502 extends in the space that crest 403 or trough 404 are formed, and forms occlusion Structure.

Combine with the various embodiments described above, embodiment four as shown in Figure 8, Figure 9, drive electrode block and sensing in Fig. 8 Yu Fig. 9 The orientation of electrode block is different, and a longitudinal arrangement one is transversely arranged.In Fig. 8, Fig. 9, drive electrode block is that triangle is wavy, And the crest of triangular wave is neighbouring with the induction electrode block of both sides respectively with trough；Induction electrode block includes a strip electrode, long Strip shaped electric poles is along it vertically to stretching out the induction electrode tooth of some triangles, and the induction electrode tooth of triangle extends into In the space that the crest of triangular wave or trough are formed, form occlusion structure.The 3rd letter is drawn in the centre position of drive electrode block Number input and the 4th signal input part, the 3rd signal input part and the 4th signal input part are adjacent, the 3rd signal input part with 3rd drives signal generator module to connect, and the 4th signal input part is connected with fourth drive signal generation module, and the 3rd drives letter Number generation module and fourth drive signal generation module are respectively to the 3rd signal input part and the 4th signal input part transmission cycle The driving signal of property.

Combining with above-described embodiment, embodiment five, six is as shown in Figure 10 to Figure 11, and the length of induction electrode tooth is variable , when the length of tooth is not reaching to crest or the trough of drive electrode block, induction electrode tooth 502 and crest 403 or trough Some suspension block 601 it are provided with between 404.The light transmission that suspension block 601 can make touch screen overall keeps consistent.

Embodiment seven, as shown in figure 12, drive electrode block 401 in wavy, crest 403 and trough 404 respectively with both sides Induction electrode block 402 is neighbouring, and crest 403 or trough 404 are extended with drive electrode tooth 801 laterally；Induction electrode block 402 wraps Include a strip electrode 501, strip electrode along it vertically to stretching out some induction electrode teeth 502, and induction electrode tooth 502 with Drive electrode tooth 801 forms the structure being mutually twisted.

Combining with the various embodiments described above, embodiment eight as shown in figure 13, is drawn in the centre position of drive electrode block 401 3rd driving signal input 901, wherein, the 3rd signal input part 901 is drawn in drive electrode block 401 middle part.3rd letter Number input 901 drives signal generator module to be connected with the 3rd, and the 3rd driving signal generator module is to the 3rd signal input part 901 Transmission driving signal periodically.

Combining with the various embodiments described above, embodiment nine as shown in figure 14, is also drawn in the centre position of drive electrode block 4th signal input part 902, the 4th signal input part 902 is adjacent with the 3rd signal input part 901, the 4th signal input part 902 Being connected with fourth drive signal generation module, fourth drive signal generation module is to the 4th signal input part 902 transmission periodically Driving signal.

Combine with the various embodiments described above, embodiment ten, embodiment 11 respectively as shown in Figure 15, Figure 16, for Figure 13, Induction electrode block and the transversely arranged of drive electrode block in Figure 14 change longitudinal arrangement into.Longitudinal arrangement induction electrode block and driving Electrode block can reduce the cabling on touch screen both sides, and the frame making touch screen both sides is narrower.

For self-capacitance:

Combining with the various embodiments described above, embodiment 13,14, respectively as shown in Figure 17, Figure 18, touches for self-capacitance The embodiment of screen wire laying mode, detecting electrode is wavy, is certainly also designed to strip.In like manner, it is also possible at detecting electrode Centre position draw a signal input part, two signal input parts or more signal input part, Figure 17 is in longitudinal direction Arrangement detecting electrode position, middle part draw two signal input parts, two signals drawn enter end respectively with detection module It is connected.

Combining with the various embodiments described above, as shown in figure 19, detecting electrode includes a strip electrode to embodiment 15, long Strip shaped electric poles is along it vertically to stretching out some detecting electrode teeth, and detecting electrode tooth extends between adjacent detecting electrode tooth In the space formed, form occlusion structure.

Combining with the various embodiments described above, as shown in figure 20, detecting electrode is wavy to embodiment 16, and wavy can be three Angle ripple, square wave or other waveform, and crest or trough be extended with detecting electrode tooth laterally；The detecting electrode that trough stretches out The detecting electrode tooth arranged adjacent that the crest of tooth and another detecting electrode stretches out.

Combining with the various embodiments described above, as shown in figure 21, detecting electrode is wavy to embodiment 17, and adjacent electrode ripple Peak is mutually twisted with trough, and wavy can be triangular wave, square wave or other waveform, and crest or trough are extended with laterally Detecting electrode tooth；And detecting electrode tooth extends in the space that crest or trough are formed, form occlusion structure.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.