CN203490677U - Capacitive touchscreen - Google Patents
Capacitive touchscreen Download PDFInfo
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- CN203490677U CN203490677U CN201320481943.1U CN201320481943U CN203490677U CN 203490677 U CN203490677 U CN 203490677U CN 201320481943 U CN201320481943 U CN 201320481943U CN 203490677 U CN203490677 U CN 203490677U
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Abstract
The utility model relates to the field of capacitive touch control and discloses a capacitive touchscreen. Sensing units including drive electrodes and sensing electrodes are distributed on the capacitive touchscreen. Mutual capacitors are formed between the drive electrodes and the sensing electrodes. The drive electrodes and the sensing electrodes are designed into preset patterns, so that the mutual capacitors make gradient changes along the lengthwise direction of the drive electrodes and the sensing electrodes. Drive signals are applied to the drive electrodes, and a measurement signal is detected through each mutual capacitor. Due to a touch, the capacitors formed between a touch control object and the drive electrodes and the sensing electrodes shunt the signals passing through the capacitors, so that the signals detected by the sensing electrodes change, and the position of the point of the touch is determined based on the change of the detected signals. As the sensing units are designed to be gradually-changed patterns, so that touch positioning is simple in method and high in precision, and thus the touchscreen has the advantages of low costs and high detection precision.
Description
Technical field
The utility model relates to capacitance touching control field, particularly capacitive touch screen.
Background technology
In recent years, development along with touch-control sensing technology, touch-screen net book, touch screen flat panel computer, touch-screen mobile phone have started to popularize, and these platforms, because its touch control display panel (being called for short " touch screen ") has and controls easy advantage, are widely applied.
Touch-control sensing technology can be divided into multiple according to its principle, common are resistance induction type, capacitor induction type and induction etc.Wherein, capacitance sensing is the gordian technique that realizes capacitor induction type touch-control sensing technology.Capacitance sensing can relate to the approaching of input object finger, pointer or certain other object of sensing such as people, contact and/or position.Capacitor induction type touch screen can be divided into self-capacitance screen and mutual capacitance is shielded two types.
At tin indium oxide (ITO for glass surface, a kind of transparent conductive material) be made into laterally and longitudinal electrode array, as shown in Figure 1, these horizontal and vertical electrodes form electric capacity with ground respectively, this electric capacity is exactly usually said self-capacitance, namely electrode electric capacity over the ground.When finger touch arrives capacitance plate, finger electric capacity over the ground will be added in screen body capacitance, and making to shield body capacitance amount increases.When touching detection, self-capacitance screen detects respectively laterally and longitudinal electrode array successively, according to the variation that touches front and back electric capacity, determines respectively lateral coordinates and along slope coordinate, is then combined into the touch coordinate of plane.The scan mode of self-capacitance, is equivalent to the touch point on touch-screen to project to respectively X-axis and Y direction, then in X-axis and Y direction, calculates coordinate respectively, is finally combined into the coordinate of touch point.If single-point touches, the projection in X-axis and Y direction is all unique, and the coordinate being combined into is also unique; If on touch-screen, have 2 touch and these 2 not in same directions X or same Y-direction, at X and Y-direction, have respectively two projections, be combined into 4 coordinates.Obviously, it is real only having two coordinates, and two other is exactly " the terrible point " being commonly called as.Therefore, self-capacitance screen cannot be realized real multiple point touching, and self-capacitance screen is also more easily disturbed and causes erroneous judgement by the electromagnetic signal of periphery.
Mutual capacitance screen is also that ITO makes transverse electrode and longitudinal electrode for glass surface, and it is with the difference of self-capacitance screen, and the place of two arrays of electrodes intersection will form electric capacity, is also the two poles of the earth that this two arrays of electrodes has formed respectively electric capacity.When finger touch arrives capacitance plate, affected the coupling between near two electrodes in touch point, thereby equivalence has changed the electric capacity between these two electrodes.While detecting mutual capacitance size, horizontal electrode sends pumping signal successively, and all electrodes receive signal simultaneously longitudinally, can obtain like this capacitance size of all horizontal and vertical electrode joints, i.e. the capacitance size of the two dimensional surface of whole touch-screen.According to touch screen two-dimensional capacitance change data, can calculate the coordinate of each touch point.Therefore,, even if there are a plurality of touch points on screen, also can calculate the true coordinate of each touch point.
According to the difference of cost and accuracy of detection, occurred on the market at present all kinds self-capacitance formula touch screen and mutual capacitance type touch control screen, but current touch screen is difficult to accomplish the unification of low-cost and high-precision.Such as, shown in Fig. 1, be that a kind of drive electrode and induction electrode are distributed in the crisscross mutual capacitance screen on two-layer, can realize detection accurately, but the two-layer ITO of needs realize respectively drive electrode and induction electrode, cost is higher.Shown in Fig. 2, be the self-capacitance screen of a kind of distribution of electrodes on one deck, it is with low cost, but precision is not high, a little less than antijamming capability.
Utility model content
The purpose of this utility model is to provide a kind of capacitive touch screen, makes capacitive touch screen have advantages of with low cost and high measurement accuracy.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of capacitive touch screen, on described capacitive touch screen, be distributed with some groups of sensing units, each group sensing unit comprises drive electrode and induction electrode, and described drive electrode and described induction electrode form mutual capacitance;
Described drive electrode and described induction electrode are designed to predetermined pattern, make described mutual capacitance become graded along the length direction of described drive electrode or described induction electrode, and exist while touching, touch location changes along described length direction, and the variable quantity of described mutual capacitance becomes graded along described length direction.
The utility model embodiment in terms of existing technologies, on capacitive touch screen, be distributed with the sensing unit that comprises drive electrode and induction electrode, between drive electrode and induction electrode, form mutual capacitance, by drive electrode and induction electrode are designed to default pattern, make mutual capacitance become graded along the length direction of drive electrode and induction electrode; On drive electrode, apply driving signal, see through this mutual capacitance and a measuring-signal can be detected, mutual capacitance is larger, and the signal detecting on induction electrode is larger; On capacitive touch screen, exist while touching, due to the existence touching, the signal shunting of the mutual capacitance that the electric capacity that makes to form between touch control object and drive electrode and induction electrode can form between drive electrode and induction electrode flowing through, cause the signal intensity detecting on induction electrode, according to the variation of this detection signal, can determine the position of touch point; And, because drive electrode and induction electrode are designed to default pattern, make mutual capacitance become graded along the length direction of drive electrode and induction electrode, therefore, the degree of the signal intensity detecting on induction electrode also changes along the length direction of drive electrode and induction electrode, thereby can determine that touch point is in the position of directions X.The utility model makes touch location detection simple by drive electrode and induction electrode being designed to the graphic designs of gradual change, and precision is higher, makes capacitive touch screen have advantages of with low cost and high measurement accuracy.
In addition, described sensing unit comprises: the first drive electrode, the second drive electrode and induction electrode; Described induction electrode is between described the first drive electrode and described the second drive electrode; Described induction electrode and described the first drive electrode form the first mutual capacitance, and described induction electrode and described the second drive electrode form the second mutual capacitance; Wherein, described the first mutual capacitance and described the second mutual capacitance are contrary variation tendency along the length direction of described drive electrode or described induction electrode.
By induction electrode being placed between two drive electrodes, two drive electrodes are engaged on induction electrode and carry out input, can make accuracy of detection higher.
In addition, described sensing unit comprises: the first induction electrode, the second induction electrode and drive electrode; Described drive electrode is between described the first induction electrode and described the second induction electrode; Described drive electrode and described the first induction electrode form the 3rd mutual capacitance, and described drive electrode and described the second induction electrode form the 4th mutual capacitance; Wherein, described the 3rd mutual capacitance and described the 4th mutual capacitance are contrary variation tendency along the length direction of described drive electrode or described induction electrode.
By drive electrode being placed between two induction electrodes, two induction electrodes are engaged on drive electrode and carry out input, can make accuracy of detection higher.
In addition, described default pattern comprises:
The width of described drive electrode becomes graded along the length direction of described drive electrode; Or,
The width of described induction electrode becomes graded along the length direction of described induction electrode; Or,
The width of described drive electrode becomes graded along the length direction of described drive electrode, and the width of described induction electrode becomes graded along the length direction of described induction electrode.
By the size of electrode, realize the graded of mutual capacitance.
In addition, described default pattern comprises: the length of action in unit electrode length direction or the interlock degree of depth or the two all become graded along the length direction of described drive electrode or described induction electrode to described drive electrode with described induction electrode; Wherein, described drive electrode and the described induction electrode shape interlock to preset.
Length variations by the boundary line between drive electrode and induction electrode in unit distance, realizes the graded of mutual capacitance.
In addition, described drive electrode and described induction electrode are with level and smooth circular arc interlock.Make the variation of detection signal on induction electrode be approximated to linear relationship, thereby improve accuracy of detection.
In addition, described default pattern comprises: the spacing between described drive electrode and described induction electrode becomes graded along the length direction of described drive electrode or described induction electrode.By the variation of the spacing between drive electrode and induction electrode, realize the graded of mutual capacitance.
In addition, in the gap between described drive electrode and described induction electrode, be provided with free electrode; Described free electrode is in vacant state;
The density of described free electrode or quantity or the two all become graded along the length direction of described drive electrode or described induction electrode.
By free electrode is set in the gap between drive electrode and induction electrode, can makes the variation of mutual capacitance more even, thereby improve accuracy of detection.
In addition, described sensing unit is arranged in groups in the touch area of described capacitive touch screen.When carrying out touch point position probing, drive electrode is corresponding with induction electrode, makes to detect more convenient.
In addition, described drive electrode and the cross arrangement in the touch area of described capacitive touch screen of described induction electrode.This arrangement mode can carry out input by apply signal on a drive electrode on adjacent induction electrode, makes to diminish in the sweep spacing of Y-direction, thereby improves the resolution of Y-direction.
In addition, the cabling of described drive electrode and described induction electrode leads to respectively the different port of peripheral control unit from outer end separately.By each electrode is connected respectively with peripheral control unit, make, when carrying out touch location detection, each port to be controlled respectively, realize simply, detect more convenient.
In addition, have at least two induction electrodes to be connected to the same port of described peripheral control unit, or have at least two drive electrodes to be connected to the same port of described peripheral control unit.By the port of multiplexing peripheral control unit, can reduce the number of pins from electrode to peripheral control unit, reduce costs.
Accompanying drawing explanation
Fig. 1 is according to the distribution plan of the expensive high-precision sensing unit of prior art;
Fig. 2 is according to the distribution plan of the sensing unit of the low precision of low cost of prior art;
Fig. 3 is according to the schematic diagram of the sensing unit of the capacitive touch screen of the utility model the first embodiment;
Fig. 4 is according to the composition schematic diagram of the sensing unit of the capacitive touch screen of the utility model the second embodiment;
Fig. 5 is according to there being the difference of signal that touches and detect during no touch and the coordinate of directions X schematic diagram one to one;
Fig. 6 forms schematic diagram according to the another kind of the sensing unit of the capacitive touch screen of the utility model the second embodiment;
Fig. 7 is the schematic diagram that sensing unit is arranged in groups in the touch area of capacitive touch screen;
Fig. 8 is the schematic diagram of drive electrode and induction electrode cross arrangement in the touch area of capacitive touch screen;
Fig. 9 A to Fig. 9 C is according to the schematic diagram of the sensing unit of the capacitive touch screen of the utility model the 3rd embodiment;
Figure 10 is the level and smooth circular arc interlock schematic diagram according to the sensing unit of the capacitive touch screen of the utility model the 3rd embodiment;
Figure 11 is according to the schematic diagram of the sensing unit of the capacitive touch screen of the utility model the 4th embodiment;
Figure 12 is according to the schematic diagram of the sensing unit of the capacitive touch screen of the utility model the 5th embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, each embodiment of the present utility model is explained in detail.Yet, persons of ordinary skill in the art may appreciate that in each embodiment of the utility model, in order to make reader understand the application better, many ins and outs have been proposed.But, even without these ins and outs and the many variations based on following embodiment and modification, also can realize each claim of the application technical scheme required for protection.
The first embodiment of the present utility model relates to a kind of capacitive touch screen, is distributed with some groups of sensing units on this capacitive touch screen, and each group sensing unit comprises drive electrode and induction electrode, and drive electrode and induction electrode form mutual capacitance; Drive electrode and induction electrode are designed to predetermined pattern, make mutual capacitance become graded along the length direction of drive electrode or induction electrode, and exist while touching, and touch location changes along its length, and the variable quantity of mutual capacitance becomes graded along this length direction.
Specifically, drive electrode and induction electrode can be realized with one deck ITO, form an electric capacity between drive electrode and induction electrode, are called mutual capacitance.When applying a driving signal on drive electrode, see through mutual capacitance, this driving signal on induction electrode, can be detected.Mutual capacitance is larger, and the signal detecting on induction electrode is larger.When human finger or other property led materials are during across cover plate touch sensing unit, finger can and drive electrode and induction electrode form electric capacity, drive electrode or induction electrode width are larger, the electric capacity between itself and finger is larger.Electric capacity between finger and drive electrode and induction electrode can be shunted the signal of the mutual capacitance of flowing through, and causes the signal detecting on induction electrode to diminish.
The direction of supposing definition sensing unit graded is directions X, the direction vertical with X, and the direction that many group sensing units are arranged is Y-direction.The position probing thinking of directions X and Y-direction is:
When finger is along directions X, when drive electrode and induction electrode graded direction move, the signal detecting on induction electrode changes along with the movement of finger, thereby can identify X coordinate finger position.When finger moves along Y-direction, only have the sensing unit near finger can detect signal intensity, thereby detect Y coordinate position.
At present, mutual capacitance type touch control screen is general by the mutual capacitance forming between a drive electrode and an induction electrode, as shown in Figure 1, when no touch, applies driving signal on drive electrode, detection signal on induction electrode; When there is touch, signal on induction electrode, being detected can change, and can determine the position of touch point by the variation of this signal.Such as, if horizontal, be drive electrode, be longitudinally induction electrode, by applying line by line driving signal, and detect by column, can be easy to determine the position of touch point.In the present embodiment, owing to there not being intersection between drive electrode and induction electrode, its detection mode can change to some extent, as shown in Figure 3, in figure, the width of drive electrode D becomes graded along the length direction of drive electrode, thereby make the mutual capacitance forming between drive electrode D and induction electrode S also become graded, this mutual capacitance can be regarded as along a lot of distribution mutual capacitance of electrode length direction and be formed in parallel thereupon.
On drive electrode, apply driving signal, see through this mutual capacitance and a measuring-signal can be detected, mutual capacitance is larger, and the signal detecting on induction electrode is larger; On capacitive touch screen, exist while touching, due to the existence touching, the signal shunting of the mutual capacitance that the electric capacity that makes to form between touch control object and drive electrode and induction electrode can form between drive electrode and induction electrode flowing through, cause the signal intensity detecting on induction electrode, according to the variation of this detection signal, can determine the position of touch point.Owing to drive electrode or induction electrode being designed to the pattern of gradual change, make two mutual capacitance between electrode become graded along directions X, thereby make to exist while touching, the variable quantity of mutual capacitance also changes along directions X, and corresponding one by one with the position of directions X, therefore, as long as when there is touch, this variable quantity detected, can determine the X coordinate of touch point.That is to say, when finger touches, at drive electrode diverse location along its length, point differently from the contact area of drive electrode, make the change of mutual capacitance different, thereby the degree that signal is diminished is different, accordingly, can determine that touch point is in the position of drive electrode length direction.In the detection of actual touch position, generally, by apply driving signal on drive electrode, on induction electrode, detect induced signal, and determine X coordinate according to the variable quantity of induced signal in no touch and two kinds of situations of existence touch.
In addition, it is worth mentioning that, the cabling of drive electrode and induction electrode can lead to respectively from outer end separately the different port of peripheral control unit, by each electrode is connected respectively with peripheral control unit, make when carrying out touch location detection, each port is controlled respectively, realized simply, detect more convenient.
Or, by the port of multiplexing peripheral control unit, can reduce the number of pins from electrode to peripheral control unit, reduce costs.Specifically, have at least two induction electrodes to be connected to the same port of peripheral control unit, or have at least two drive electrodes to be connected to the same port of peripheral control unit, or, have at least two induction electrodes to be connected to the same port of peripheral control unit, and have at least two drive electrodes to be connected to the same port of peripheral control unit.In this case, for the accuracy that guarantees to touch, the corresponding relation between corresponding relation between induction electrode two drive electrodes adjacent with it two drive electrodes adjacent with it with another multiplexing induction electrode can not be identical.
In addition, drive electrode and induction electrode can, for transparent conductive medium (being commonly called as ITO), be arranged on the substrate of transparent material.And being sheet resistance, the cabling of capacitance plate marginal portion is less than transparent material or the non-transparent material of induction electrode sheet resistance.In the utility model, drive electrode and induction electrode group are distributed in touch area, can increase by reducing the width of single electrode the number of electrode on the one hand, thereby improve resolution and the linearity of touch-screen; On the other hand, because the cabling of induction electrode is all drawn by outer end separately, can suitably increase trace width or select transparent material that sheet resistance is less or requirement that non-transparent material meets electric conductivity.
In addition, what deserves to be explained is, in order to realize mutual capacitance, along the length direction of drive electrode or induction electrode, become graded, by the size of electrode, realize the graded of mutual capacitance.The predetermined pattern of drive electrode and induction electrode can comprise following several situation:
(1) width of drive electrode becomes graded along the length direction of drive electrode;
(2) width of induction electrode becomes graded along the length direction of induction electrode;
(3) width of drive electrode becomes graded along the length direction of drive electrode, and the width of induction electrode becomes graded along the length direction of induction electrode.
The utility model embodiment in terms of existing technologies, on capacitive touch screen, be distributed with the sensing unit that comprises drive electrode and induction electrode, between drive electrode and induction electrode, form mutual capacitance, by drive electrode and induction electrode are designed to default pattern, make mutual capacitance become graded along the length direction of drive electrode and induction electrode; On drive electrode, apply driving signal, see through this mutual capacitance and a measuring-signal can be detected, mutual capacitance is larger, and the signal detecting on induction electrode is larger; On capacitive touch screen, exist while touching, due to the existence touching, the signal shunting of the mutual capacitance that the electric capacity that makes to form between touch control object and drive electrode and induction electrode can form between drive electrode and induction electrode flowing through, cause the signal detecting on induction electrode to diminish, according to the variation of this detection signal, can determine the position of touch point; And, because drive electrode and induction electrode are designed to default pattern, make mutual capacitance become graded along the length direction of drive electrode and induction electrode, therefore, the degree that the signal detecting on induction electrode diminishes also changes along the length direction of drive electrode and induction electrode, thereby can determine that touch point is in the position of directions X.To make to touch precision higher by drive electrode and induction electrode being designed to the graphic designs of gradual change for the utility model, makes capacitive touch screen have advantages of with low cost and high measurement accuracy.
The second embodiment of the present utility model relates to a kind of capacitive touch screen.The second embodiment has been done further improvement on the first embodiment basis, main improvements are: in the utility model the second embodiment, in every group of sensing unit, comprise two drive electrodes or two induction electrodes, by induction electrode being placed between two drive electrodes, two drive electrodes are engaged in and on induction electrode, carry out input, or by drive electrode being placed between two induction electrodes, two induction electrodes are engaged on drive electrode and carry out input, can make accuracy of detection higher.
Specifically, as shown in Figure 4, sensing unit comprises: the first drive electrode D1, the second drive electrode D2 and induction electrode S; Induction electrode is between the first drive electrode and the second drive electrode; Induction electrode and the first drive electrode form the first mutual capacitance, and induction electrode and the second drive electrode form the second mutual capacitance; Wherein, the first mutual capacitance and the second mutual capacitance are contrary variation tendency along the length direction of drive electrode or induction electrode.That is to say, the first mutual capacitance changes from big to small along the length direction of drive electrode or induction electrode, and the second mutual capacitance changes from small to large along the length direction of drive electrode or induction electrode; Or contrary: the first mutual capacitance changes from small to large along the length direction of drive electrode or induction electrode, and the second mutual capacitance changes from big to small along the length direction of drive electrode or induction electrode.On the first drive electrode, apply the first driving signal V
in1, signal V on induction electrode, detected
out1; On the second drive electrode, apply two driving signal V
in2, signal V on induction electrode, detected
out2; When carrying out touch location detection, on the first drive electrode, apply the first driving signal V
in1, signal V ' on induction electrode, detected
out1; On the second drive electrode, apply two driving signal V
in2, signal V ' on induction electrode, detected
out2; If V
out1≠ V '
out1or V
out2≠ V '
out2, the position of the Y-direction that the induction electrode present position that this variation detected is so touch point.Then according to the difference DELTA V of the signal that has while touching and detect during no touch
1=V '
out1-V
out1, Δ V
2=V '
out2-V
out2, can determine the position of directions X.Such as, Δ V
1-Δ V
2or
corresponding one by one with the coordinate of directions X.The sensing unit in Fig. 4 of take is example, Δ V
1-Δ V
2with the corresponding relation schematic diagram of the coordinate of directions X as shown in Figure 5.
In addition, what deserves to be explained is, in actual applications, need specifically determine coordinate according to resolution.For instance, for there being many groups to drive the situation of induction, can, by being averaging or weighted mean, improve accuracy in detection.
Suppose: in first group of sensing unit, the variable quantity recording between the first drive electrode D1 and induction electrode S is V
11, the variable quantity recording between the second drive electrode D2 and induction electrode S is V
12, by that analogy, be respectively V in second group
21and V
22, be respectively V in the 3rd group
31and V
32detect and calculate all variable quantities, if maximal value is wherein greater than predefined threshold value, just think that this frame has detected touch.
Suppose V
31maximum, is exactly that touch point appears at the 3rd group so, can calculate X coordinate and Y coordinate by following formula:
Wherein, K
1the coefficient relevant with the resolution of directions X, K
2the coefficient relevant with the resolution of Y-direction;
V
r=V
21+ V
31+ V
41, maximal value and two adjacent groups and.
V
L=V
22+V
32+V
42
V
n=V
n1+V
n2，n=1,2,3,......
In above-mentioned formula, calculate V
r, also can adopt the variable quantity sum between the first drive electrode and induction electrode in all sensing unit groups,
n=1,2,3 ..., correspondingly, V
lalso can adopt the variable quantity sum between the second drive electrode and induction electrode in all sensing unit groups, summation can be more convenient like this.
Refer to Fig. 6, sensing unit can also comprise: the first induction electrode, the second induction electrode and drive electrode; Drive electrode is between the first induction electrode and the second induction electrode; Drive electrode and the first induction electrode form the 3rd mutual capacitance, and drive electrode and the second induction electrode form the 4th mutual capacitance; Wherein, the 3rd mutual capacitance and the 4th mutual capacitance are contrary variation tendency along the length direction of drive electrode or induction electrode.And the mode of above-mentioned induction electrode between two drive electrodes is similar, on drive electrode, applies and drive signal V
in, signal V on the first induction electrode, detected
out3, signal V on the second induction electrode, detected
out4; When carrying out touch location detection, on drive electrode, apply and drive signal V
in, signal V ' on the first induction electrode, detected
out3, signal V ' on the second induction electrode, detected
out4; If V
out3≠ V '
out3or V
out4≠ V '
out4, the position of the Y-direction that the induction electrode present position that this variation detected is so touch point.The difference DELTA V of the signal detecting when then basis has touch and no touch
3=V '
out3-V
out3, Δ V
4=V '
out4-V
out4, can determine the position of directions X.Such as, Δ V
3-Δ V
4or
corresponding one by one with the coordinate of directions X.
In addition, it is worth mentioning that, the arrangement mode of sensing unit is different, and detection method, detection complexity and accuracy of detection are had to different impacts.Such as, sensing unit is arranged in groups in the touch area of capacitive touch screen, as shown in Figure 7, in figure, drive electrode D1, D2 and induction electrode S1 form one group of sensing unit, drive electrode D3, D4 and induction electrode S2 form another group sensing unit, the like, sensing unit is arranged a group by a group in touch area.When carrying out touch point position probing, drive electrode is corresponding with induction electrode, makes to detect more convenient.
Or, the cross arrangement in the touch area of capacitive touch screen of drive electrode and induction electrode, as shown in Figure 8, in figure, drive electrode D1, D2, D3, D4 and induction electrode S1, S2, S3 cross arrangement.This arrangement mode can carry out input by apply signal on a drive electrode on adjacent induction electrode, makes to diminish in the sweep spacing of Y-direction, thereby improves the resolution of Y-direction.
The 3rd embodiment of the present utility model relates to a kind of capacitive touch screen.The 3rd embodiment and the first embodiment are roughly the same, and key distinction part is: in the first embodiment, by by the size of electrode in predetermined pattern, realize the graded of mutual capacitance.And in the utility model the 3rd embodiment, the length by adjacent edge boundary line between drive electrode and induction electrode becomes graded, realizes the graded of mutual capacitance.
Specifically, default pattern comprises: drive electrode and the length of action of induction electrode in unit electrode length direction become graded along the length direction of drive electrode or induction electrode, as shown in Figure 9 A; Or drive electrode and the interlock degree of depth of induction electrode in unit electrode length direction become graded along the length direction of drive electrode or induction electrode, as shown in Figure 9 C; Or, drive electrode and the length of action of induction electrode in unit electrode length direction become graded along the length direction of drive electrode or induction electrode, and drive electrode and the interlock degree of depth of induction electrode in unit electrode length direction become graded along the length direction of drive electrode or induction electrode; Wherein, drive electrode and the induction electrode shape interlock to preset.In actual applications, can select flexibly as required above-mentioned interlock mode, but its object is all to make the adjacent length of side of two electrodes become graded along electrode length direction, thereby make the distribution mutual capacitance size of two electrodes also become graded, specifically, drive electrode and induction electrode are directly proportional to drive electrode in this unit distance and the adjacent boundary length of induction electrode along the mutual capacitance of electrode length direction unit distance.The adjacent boundary length of each electrode and overlying electrode changes from big to small, changes from small to large with the adjacent boundary length of lower electrodes, or contrary.
In addition, it is worth mentioning that, the interlock between drive electrode and induction electrode can be any shape, such as sawtooth interlock (as shown in Figure 9 A), rectangle interlock are (as shown in Fig. 9 B, 9C, in figure, D is drive electrode, and S is induction electrode), circular arc interlock (as shown in figure 10) etc.Wherein, be that drive electrode and induction electrode are with the schematic diagram of level and smooth circular arc interlock as shown in figure 10.By level and smooth circular arc interlock, make the variation of the adjacent boundary length between electrode smoother, thereby it is also smoother that two mutual capacitance between electrode are changed, on induction electrode, the variation of detection signal is approximated to linear relationship, thereby improves accuracy of detection.
The 4th embodiment of the present utility model relates to a kind of capacitive touch screen.The 4th embodiment and the first embodiment are roughly the same, and key distinction part is: in the first embodiment, by by the size of electrode in predetermined pattern, realize the graded of mutual capacitance.And in the utility model the 4th embodiment, by the spacing between drive electrode and induction electrode, become graded, realize the graded of mutual capacitance.
Specifically, shown in Figure 11, default pattern comprises: the spacing between drive electrode and induction electrode becomes graded along the length direction of drive electrode or induction electrode.In figure, spacing between the first drive electrode D1 and induction electrode S changes from big to small, spacing between the second drive electrode D2 and induction electrode S changes from small to large, thereby the mutual capacitance between the first drive electrode D1 and induction electrode S is changed from small to large, and the mutual capacitance between the second drive electrode D2 and induction electrode S is from size to little variation.Also can be just in time contrary, no matter adopt which kind of specific implementation, all need to determine detection signal on induction electrode and the corresponding relation between the position of directions X, thereby finally determine the position of touch point.
The 5th embodiment of the present utility model relates to a kind of capacitive touch screen.The 5th embodiment has been done further improvement on the first embodiment, the second embodiment, the 3rd embodiment or the 4th embodiment basis, main improvements are: in the utility model the 5th embodiment, by increase free electrode between electrode, make the variation of mutual capacitance more even, improve accuracy of detection.
Specifically, as shown in figure 12, be provided with free electrode F in the gap between drive electrode D and induction electrode S, this free electrode is in vacant state; And the density of free electrode becomes graded along the length direction of drive electrode or induction electrode; Or the quantity of free electrode becomes graded along the length direction of drive electrode or induction electrode; Or the density of free electrode becomes graded along the length direction of drive electrode or induction electrode, and the quantity of free electrode becomes graded along the length direction of drive electrode or induction electrode.In figure, between drive electrode D and induction electrode S, in unit area, the quantity of free electrode changes from big to small, matches with the spacing between drive electrode and induction electrode, makes the variation of mutual capacitance more even, thereby improves accuracy of detection.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above are to realize specific embodiment of the utility model, and in actual applications, can to it, do various changes in the form and details, and do not depart from spirit and scope of the present utility model.
Claims (12)
1. a capacitive touch screen, is characterized in that, is distributed with some groups of sensing units on described capacitive touch screen, and each group sensing unit comprises drive electrode and induction electrode, and described drive electrode and described induction electrode form mutual capacitance;
Described drive electrode and described induction electrode are designed to predetermined pattern, make described mutual capacitance become graded along the length direction of described drive electrode or described induction electrode, and exist while touching, touch location changes along described length direction, and the variable quantity of described mutual capacitance becomes graded along described length direction.
2. capacitive touch screen according to claim 1, is characterized in that, described sensing unit comprises: the first drive electrode, the second drive electrode and induction electrode; Described induction electrode is between described the first drive electrode and described the second drive electrode; Described induction electrode and described the first drive electrode form the first mutual capacitance, and described induction electrode and described the second drive electrode form the second mutual capacitance; Wherein, described the first mutual capacitance and described the second mutual capacitance are contrary variation tendency along the length direction of described drive electrode or described induction electrode.
3. capacitive touch screen according to claim 1, is characterized in that, described sensing unit comprises: the first induction electrode, the second induction electrode and drive electrode; Described drive electrode is between described the first induction electrode and described the second induction electrode; Described drive electrode and described the first induction electrode form the 3rd mutual capacitance, and described drive electrode and described the second induction electrode form the 4th mutual capacitance; Wherein, described the 3rd mutual capacitance and described the 4th mutual capacitance are contrary variation tendency along the length direction of described drive electrode or described induction electrode.
4. capacitive touch screen according to claim 1, is characterized in that, described default pattern comprises:
The width of described drive electrode becomes graded along the length direction of described drive electrode; Or,
The width of described induction electrode becomes graded along the length direction of described induction electrode; Or,
The width of described drive electrode becomes graded along the length direction of described drive electrode, and the width of described induction electrode becomes graded along the length direction of described induction electrode.
5. capacitive touch screen according to claim 1, is characterized in that, described default pattern comprises:
Described drive electrode and the length of action of described induction electrode in unit electrode length direction become graded along the length direction of described drive electrode or described induction electrode; Or,
Described drive electrode and the interlock degree of depth of described induction electrode in unit electrode length direction become graded along the length direction of described drive electrode or described induction electrode; Or,
Described drive electrode and the length of action of described induction electrode in unit electrode length direction become graded along the length direction of described drive electrode or described induction electrode, and described drive electrode and the interlock degree of depth of described induction electrode in unit electrode length direction become graded along the length direction of described drive electrode or described induction electrode;
Wherein, described drive electrode and the described induction electrode shape interlock to preset.
6. capacitive touch screen according to claim 5, is characterized in that, described drive electrode and described induction electrode are with level and smooth circular arc interlock.
7. capacitive touch screen according to claim 1, is characterized in that, described default pattern comprises: the spacing between described drive electrode and described induction electrode becomes graded along the length direction of described drive electrode or described induction electrode.
8. capacitive touch screen according to claim 1, is characterized in that, in the gap between described drive electrode and described induction electrode, is provided with free electrode; Described free electrode is in vacant state;
The density of described free electrode becomes graded along the length direction of described drive electrode or described induction electrode; Or,
The quantity of described free electrode becomes graded along the length direction of described drive electrode or described induction electrode; Or,
The density of described free electrode becomes graded along the length direction of described drive electrode or described induction electrode, and the quantity of described free electrode becomes graded along the length direction of described drive electrode or described induction electrode.
9. capacitive touch screen according to claim 1, is characterized in that, described sensing unit is arranged in groups in the touch area of described capacitive touch screen.
10. capacitive touch screen according to claim 1, is characterized in that, described drive electrode and the cross arrangement in the touch area of described capacitive touch screen of described induction electrode.
11. capacitive touch screens according to claim 1, is characterized in that, the cabling of described drive electrode and described induction electrode leads to respectively the different port of peripheral control unit from outer end separately.
12. capacitive touch screens according to claim 11, is characterized in that,
Have at least two induction electrodes to be connected to the same port of described peripheral control unit; Or,
Have at least two drive electrodes to be connected to the same port of described peripheral control unit; Or,
Have at least two induction electrodes to be connected to the same port of described peripheral control unit, and have at least two drive electrodes to be connected to the same port of described peripheral control unit.
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| CN201320481943.1U CN203490677U (en) | 2013-08-07 | 2013-08-07 | Capacitive touchscreen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320481943.1U CN203490677U (en) | 2013-08-07 | 2013-08-07 | Capacitive touchscreen |
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| CN203490677U true CN203490677U (en) | 2014-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104346009A (en) * | 2013-08-07 | 2015-02-11 | 上海思立微电子科技有限公司 | Capacitance touch screen and touch position detection method on capacitance touch screen |
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2013
- 2013-08-07 CN CN201320481943.1U patent/CN203490677U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104346009A (en) * | 2013-08-07 | 2015-02-11 | 上海思立微电子科技有限公司 | Capacitance touch screen and touch position detection method on capacitance touch screen |
| CN104346009B (en) * | 2013-08-07 | 2018-08-28 | 上海思立微电子科技有限公司 | Touch position detecting method on capacitance touching control screen and capacitance touching control screen |
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