CN103049148A - Capacitive touch display device - Google Patents
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- CN103049148A CN103049148A CN2011103547793A CN201110354779A CN103049148A CN 103049148 A CN103049148 A CN 103049148A CN 2011103547793 A CN2011103547793 A CN 2011103547793A CN 201110354779 A CN201110354779 A CN 201110354779A CN 103049148 A CN103049148 A CN 103049148A
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Abstract
A capacitive touch display device comprises a capacitive touch panel and a capacitive touch sensor. The capacitive touch sensor includes a plurality of driving lines, a plurality of sensing lines and a sensing circuit. The first and second driving lines are used for inputting first and second driving voltages with different phases and different voltages. The first and second sensing lines arranged adjacently are respectively overlapped with the first and second driving lines to form a first node and a second node. The first and second nodes are coupled out of the first and second mutual inductance capacitors, and further coupled out of the first and second sensing voltages, and output by the first and second sensing lines. The sensing circuit subtracts the first and second sensing voltages to obtain a sensing voltage difference.
Description
Technical field
The present invention is relevant with liquid crystal display; Particularly, the invention relates to a kind of capacitive touch control display device, it is by the staggered drive electrode of great-jump-forward or sensing electrode, so that the sensing voltage that adjacent sense wire senses under the same time can be respectively from the different driving line that different driving voltage is provided, promote thus its signal to noise ratio (S/N ratio) (Signal-Noise Ratio, SNR).
Background technology
Along with science and technology is fast-developing, membrane transistor liquid crystal display (TFT LCD) progressively replaces traditional monitor, and has been widely used on the various electronic products such as TV, flat-panel screens, mobile phone, panel computer and projector.For the membrane transistor liquid crystal display with touch controllable function, touch control sensor is one of its important module, and the quality of its performance also directly affects the overall efficiency of liquid crystal display.
As shown in Figure 1, the capacitance type touch control sensor that generally is formed at the touch point on the capacitance type touch-control panel in order to sensing includes drive electrode (driving electrode) DE and sensing electrode (sensing electrode) SE that is vertically aligned with each other, wherein the overlap each other part of (overlap) of drive electrode DE and sensing electrode SE is referred to as node (node) NO, and mutual inductance type (mutual capacitance type) capacitance touching control sensing method is the capacitance change of each node on the sensing contact panel.Suppose that capacitance type touch control sensor includes J drive electrode and K sensing electrode, so altogether be formed with (JxK) individual node.Because each drive electrode all can provide a driving voltage and crossing with K sensing electrode, so each node all can be coupled out an Inductance and Capacitance Cm, and each Inductance and Capacitance Cm all can be coupled out sensing voltage.When capacitance type touch-control panel is touched, will change corresponding to the Inductance and Capacitance Cm of the node of touching place thereupon, its sensing voltage that is coupled out also can change, so it is touched to utilize this characteristic to go to judge whether capacitance type touch-control panel has.
Under the same time, the sensing voltage that adjacent sensing electrode senses cooperates sensing circuit to carry out sensing all from same drive electrode again.The method for sensing of sensing circuit can be current sense formula, charge transfer type or voltage sensing formula, and those method for sensing can adopt again the form of single-ended input or differential input, and is wherein best with the antinoise effect of the form of differential input.
For example, as shown in Figure 2, capacitance type touch control sensor CT includes 8 drive wire Y0～Y7 and 8 sense wire X0～X7, thus altogether be formed with 64 node N00, N10, N20 ..., N67, N77.Yet, because the sensing voltage V that adjacent sense wire X0 and X1 sensed in the same time
S0With V
S1Be respectively the driving voltage V that node N00 and N10 coupling provides from same drive wire Y0
D0, that is the sensing voltage V that senses of adjacent sensing electrode X0 and X1
S0With V
S1All have same phase, therefore, although sensing circuit SC is with the adjacent sense wire X0 of differential input and the sensing voltage V of X1
S0With V
S1Can fall low noise influence degree after subtracting each other, the intensity of itself also can be lowered behind the signal subtraction of same phase but have, so its signal to noise ratio (S/N ratio) and can't effectively being significantly improved causes the usefulness of capacitive touch control display device to be restricted.
In view of this, the present invention proposes a kind of capacitive touch control display device, to address the above problem.
Summary of the invention
A category of the present invention is to provide a kind of capacitive touch control display device.In a preferred embodiment, capacitive touch control display device comprises capacitance type touch-control panel and capacitance type touch control sensor at least.Capacitance type touch control sensor is arranged on the capacitance type touch-control panel, is formed at touch point on the capacitance type touch-control panel in order to sensing.Capacitance type touch control sensor includes a plurality of drive wires, a plurality of sense wires and sensing circuit.In this embodiment, these a plurality of drive wires are adopted great-jump-forward and are arranged.
These a plurality of drive wires comprise one group of drive wire arranging according to first direction.This group drive wire is to be made of relatively staggered the first drive wire and the second drive wire.Under the time, the first drive wire and the second drive wire have respectively the first driving voltage and second driving voltage of out of phase and different voltages in order to input.These a plurality of sense wires comprise according to the first sense wire of the adjacent arrangement of second direction and the second sense wire.The first sense wire and the first drive wire overlap to form first node, and the second sense wire and the second drive wire overlap to form Section Point.First node and Section Point are coupled out respectively the first Inductance and Capacitance and the second Inductance and Capacitance, and the first Inductance and Capacitance and the second Inductance and Capacitance are coupled out respectively the first sensing voltage and the second sensing voltage, and export the first sensing voltage and the second sensing voltage by the first sense wire and the second sense wire respectively.Sensing circuit receives the first sensing voltage and the second sensing voltage and the first sensing voltage and the second sensing voltage is subtracted each other, to obtain the sensing voltage difference.
In an embodiment, when the sensing voltage difference that obtains when sensing circuit increased, the corresponding signal to noise ratio (S/N ratio) of sensing voltage difference also increased thereupon.
In an embodiment, if the first driving voltage and the second driving voltage all have positive phase, the sensing voltage difference levels off to the first sensing voltage and deducts the value of the second sensing voltage, and the sensing voltage difference is corresponding to the first signal to noise ratio (S/N ratio).
In an embodiment, be zero if the first driving voltage has positive phase and the second driving voltage, the sensing voltage difference levels off to the value of the first sensing voltage, and the sensing voltage difference is corresponding to the second signal to noise ratio (S/N ratio).The second signal to noise ratio (S/N ratio) is greater than the first signal to noise ratio (S/N ratio).
In an embodiment, if the first driving voltage has positive phase and the second driving voltage has minus phase, the sensing voltage difference levels off to the first sensing voltage and adds the value of the second sensing voltage, and the sensing voltage difference is corresponding to the 3rd signal to noise ratio (S/N ratio).The 3rd signal to noise ratio (S/N ratio) is greater than the first signal to noise ratio (S/N ratio).
In an embodiment, if the first driving voltage be zero and the second driving voltage have minus phase, the sensing voltage difference levels off to the value of the second sensing voltage, and the sensing voltage difference is corresponding to the 4th signal to noise ratio (S/N ratio).The 4th signal to noise ratio (S/N ratio) is greater than the first signal to noise ratio (S/N ratio).
In an embodiment, sensing circuit comprises differential motion amplifying unit, differential motion amplifying unit comprises first input end, the second input end and output terminal, after first input end and the second input end receive respectively the first sensing voltage and the second sensing voltage, differential motion amplifying unit deducts the second sensing voltage with after obtaining the sensing voltage difference and the sensing voltage difference being amplified with the first sensing voltage, the sensing voltage difference after being amplified by output terminal output.
In another preferred embodiment, capacitive touch control display device comprises capacitance type touch-control panel and capacitance type touch control sensor at least.Capacitance type touch control sensor is arranged on the capacitance type touch-control panel, is formed at touch point on the capacitance type touch-control panel in order to sensing.Capacitance type touch control sensor includes a plurality of drive wires, a plurality of sense wires and sensing circuit.In this embodiment, these a plurality of sense wires are adopted great-jump-forward and are arranged.
These a plurality of drive wires comprise according to the first drive wire of the adjacent arrangement of first direction and the second drive wire.Under the time, the first drive wire and the second drive wire have respectively the first driving voltage and second driving voltage of out of phase and different voltages in order to input.These a plurality of sense wires comprise one group of sense wire arranging according to second direction.This group sense wire comprises relatively staggered the first sense wire and the second sense wire.The first sense wire and the first drive wire overlap to form first node, and the second sense wire and the second drive wire overlap to form Section Point.First node and Section Point are coupled out respectively the first Inductance and Capacitance and the second Inductance and Capacitance, and the first Inductance and Capacitance and the second Inductance and Capacitance are coupled out respectively the first sensing voltage and the second sensing voltage, and export the first sensing voltage and the second sensing voltage by the first sense wire and the second sense wire respectively.Sensing circuit receives the first sensing voltage and the second sensing voltage and the first sensing voltage and the second sensing voltage is subtracted each other, to obtain the sensing voltage difference.
Compared to prior art, capacitive touch control display device according to the present invention is to change into great-jump-forward and be staggered by the configuration of electrodes of the drive wire of capacitance type touch control sensor or sense wire is arranged by formal style chessboard originally, so that the sensing voltage that adjacent sensing electrode senses under the same time can be respectively from the different driving electrode that different driving voltage is provided, that is the sensing voltage that adjacent sensing electrode senses can have out of phase, therefore, sensing circuit not only can effectively fall low noise impact after the sensing voltage of the adjacent sensing electrode of differential input is subtracted each other, signal itself can't be lowered, so its signal to noise ratio (S/N ratio) can effectively be significantly improved.Thus, capacitance type touch control sensor of the present invention can carry out the sensing of touch points more exactly for capacitance type touch-control panel, significantly to reduce the probability of its erroneous judgement.
Can be by following detailed Description Of The Invention and appended graphic being further understood about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 illustrates traditionally the synoptic diagram that is coupled out Inductance and Capacitance on the node that the electrode of drive wire and sense wire overlaps to form.
Fig. 2 illustrates the drive wire of traditional capacitive touch control display device and node that sense wire overlaps to form is arranged synoptic diagram.
Fig. 3 illustrates the drive wire of the capacitive touch control display device in the preferred embodiment of the present invention and the node arrangement synoptic diagram of sense wire.
Fig. 4 illustrates the drive wire of this embodiment and the electrode lay-out synoptic diagram of sense wire.
Fig. 5 A to Fig. 5 C then illustrates respectively the node with different types.
Fig. 6 illustrates the drive wire of the capacitive touch control display device in another preferred embodiment of the present invention and the node arrangement synoptic diagram of sense wire.
Fig. 7 illustrates the drive wire of this embodiment and the electrode lay-out synoptic diagram of sense wire.
The main element symbol description
DE: drive electrode SE: sensing electrode
NO: node Cm: Inductance and Capacitance
Y0～Y15: drive wire X0～X15: sense wire
N00 ..., N157..., N715: node
V
D0, V
D1: driving voltage C1～C2: electric capacity
SC: sensing circuit DA: differential motion amplifying unit
+: first input end-: the second input end
OUT: output terminals A 1～A4: amplifier
SW1～SW4: switch CT: capacitance type touch control sensor
Embodiment
A preferred embodiment according to the present invention is capacitive touch control display device.In this embodiment, this capacitive touch control display device includes capacitance type touch-control panel and capacitance type touch control sensor at least, capacitance type touch control sensor can adopt mutual inductance type (mutual capacitance type) touch-control sensing method sensing to be formed at the touch point on the capacitance type touch-control panel, but not as limit.
Please refer to Fig. 3, Fig. 3 is that the drive wire (electrode) that illustrates capacitive touch control display device of the present invention and the node that sense wire (electrode) overlaps to form are arranged synoptic diagram.In this embodiment, those drive wires of capacitive touch control display device are adopted great-jump-forward and are arranged.It should be noted that what Fig. 3 illustrated only is one embodiment of the invention, drive wire (electrode) is arranged with the node of sense wire (electrode) also can other different types, not as limit.
As shown in Figure 3, drive wire Y0～Y15 and sense wire X0～X7 arrange according to horizontal direction and vertical direction respectively.Drive wire Y0～Y15 can be divided into 8 groups of drive wires altogether, from top to bottom is respectively: the 1st group of drive wire Y0 and Y1, the 2nd group of drive wire Y2 and Y3, the 3rd group of drive wire Y4 and Y5, the 4th group of drive wire Y6 and Y7, the 5th group of drive wire Y8 and Y9, the 6th group of drive wire Y10 and Y11, the 7th group of drive wire Y12 and Y13, the 8th group of drive wire Y14 and Y15.
It should be noted that, two drive wires (for example Y0 and Y1) in each group drive wire are staggered toward each other, and two drive wire is all corresponding to same row node (first row node N00 for example, N11, N20, N31, N40, N51, N60, N71), wherein a drive wire (for example Y0) connects the N00 in the first row node, N20, N40 and N60, (for example Y1) then connects the N11 in the first row node as for another drive wire, N31, N51 and N71, that is two drive wires (for example Y0 and Y1) are all adopted great-jump-forward and are cross-linked each node in the same row node.
As shown in Figure 3, sense wire X0～X7 and drive wire Y0～Y15 altogether be formed with 64 node N00, N11, N20, N31 ..., N614 and N715.Compared to the prior art of Fig. 2, although the interstitial content of Fig. 3 and sense wire number with shown in Figure 2 the same, the drive wire number of Fig. 3 obviously drive wire number more shown in Figure 2 has more one times.Please refer to Fig. 4, Fig. 4 illustrates a kind of synoptic diagram of pattern of the electrode lay-out (layout) of drive wire among this embodiment and sense wire.It should be noted that as space is limited, Fig. 4 only draws local drive wire Y0～Y7 and the part of sense wire X0～X3.
In more detail, take two drive wire Y0 of same group and Y1 as example, drive wire Y0 overlaps to form node N00, N20, N40 and N60 with sense wire X0, X2, X4 and X6 respectively, drive wire Y1 then overlaps to form node N11, N31, N51 and N71 with sense wire X1, X3, X5 and X7 respectively, all the other all can the rest may be inferred, do not give unnecessary details separately in this.
If take two sense wire X0 of adjacent arrangement and X1 as example, sense wire X0 respectively with drive wire Y0, Y2, Y4 ..., Y14 overlap to form node N00, N02, N04 ..., N014, and sense wire X1 respectively with drive wire Y1, Y3, Y5 ..., Y15 overlap to form node N11, N13 ..., N115, all the other all can the rest may be inferred, do not give unnecessary details separately in this.
What need to specify is, under the same time, adjacent two drive wire Y0 and Y1 are in order to input respectively the driving voltage V with out of phase and different voltages
D0And V
D1In practical application, the driving voltage V under the same time
D0And V
D1Big or small visual actual demand adjust, as long as driving voltage V
D0Phase place and V
D1Phase place different, can reach the effect that promotes signal to noise ratio (S/N ratio).
Because the driving voltage V of drive wire Y0 input
D0The node N00 that itself and sense wire X0 overlap to form that flows through, thus will be coupled out Inductance and Capacitance in node N00 place, and and then on sense wire X0, be coupled out sensing voltage Vs00.Driving voltage V as for drive wire Y1 input
D1The node N11 that itself and sense wire X1 overlap to form that flows through, thus will be coupled out Inductance and Capacitance in node N11 place, and and then on sense wire X1, be coupled out sensing voltage Vs11.Therefore, sensing circuit SC respectively self-induction survey line X0 and sense wire X1 receives sensing voltage Vs00 and Vs11, and sensing voltage Vs00 and Vs11 are subtracted each other to obtain the sensing voltage difference.It should be noted that the resulting sensing voltage difference of sensing circuit SC will affect the size of its signal to noise ratio (S/N ratio), when the sensing voltage difference increased, it is large that its signal to noise ratio (S/N ratio) also can become thereupon.
In practical application, sensing circuit SC comprises differential motion amplifying unit DA, and differential motion amplifying unit DA comprise first input end+, the second input end-and output terminal OUT.Behind first input end+and the second input end-receive respectively sensing voltage Vs00 and Vs11, differential motion amplifying unit DA deducts Vs11 with after obtaining the sensing voltage difference and the sensing voltage difference being amplified with sensing voltage Vs00, by the sensing voltage difference after the output terminal OUT output amplification, and through behind the follow-up signal handler, judge according to this whether capacitance type touch-control panel is touched.
Next, the driving voltage with out of phase and different voltages that will input by several different actual conditions explanation adjacent driven lines is on the impact of its signal to noise ratio (S/N ratio).
In the first situation, suppose under the same time driving voltage V that drive wire Y0 inputs
D0The driving voltage V that inputs with drive wire Y1
D1All has positive phase, because both noises will roughly be repealed by implication, the resulting sensing voltage difference DELTA of sensing circuit SC Vs1 levels off to the sensing voltage Vs00 of sense wire X0 and deducts the value of the sensing voltage Vs11 of sense wire X1, and sensing voltage difference DELTA Vs1 is corresponding to the first signal to noise ratio snr 1.In like manner, driving voltage V
D0With V
D1The situation that all has minus phase is also similar, does not give unnecessary details separately in this.
In the second situation, suppose under the same time driving voltage V that drive wire Y0 inputs
D0Have positive phase, and the driving voltage V that drive wire Y1 inputs
D1Be zero, because both noises will roughly repeal by implication, the resulting sensing voltage difference DELTA of sensing circuit SC Vs2 levels off to the value of sensing voltage Vs00 of sense wire X0, and sensing voltage difference DELTA Vs2 is corresponding to the second signal to noise ratio snr 2.Compared to the first situation, because sensing voltage Vs00 needn't deduct synchronous sensing voltage Vs11, sensing voltage difference DELTA Vs2 can be greater than sensing voltage difference DELTA Vs1, so the second signal to noise ratio snr 2 should be able to be greater than the first signal to noise ratio snr 1.
In the third situation, suppose under the same time driving voltage V that drive wire Y0 inputs
D0Have positive phase, and the driving voltage V that drive wire Y1 inputs
D1Has minus phase, because both noises will roughly be repealed by implication, the resulting sensing voltage difference DELTA of sensing circuit SC Vs3 levels off to the sensing voltage Vs00 of sense wire X0 and adds the value of the sensing voltage Vs11 of sense wire X1, and sensing voltage difference DELTA Vs3 is corresponding to the 3rd signal to noise ratio snr 3.Compared to the first situation, because sensing voltage Vs00 needn't subtract each other with sensing voltage Vs11, but with sensing voltage Vs11 addition, sensing voltage difference DELTA Vs3 can be greater than sensing voltage difference DELTA Vs1, so the 3rd signal to noise ratio snr 3 should be able to be greater than the first signal to noise ratio snr 1.In like manner, the driving voltage V that inputs of drive wire Y0
D0Have minus phase, and the driving voltage V that drive wire Y1 inputs
D1Situation with positive phase is also similar, does not give unnecessary details separately in this.
In the 4th kind of situation, suppose under the same time driving voltage V that drive wire Y0 inputs
D0Be zero, and the driving voltage V that drive wire Y1 inputs
D1Have minus phase, because both noise will roughly repeal by implication, the resulting sensing voltage difference DELTA of sensing circuit SC Vs4 levels off to the value of sensing voltage Vs11 of sense wire X1, and sensing voltage difference DELTA Vs4 is corresponding to the 4th signal to noise ratio snr 4.Compared to the first situation, because sensing voltage Vs11 needn't subtract each other with synchronous sensing voltage Vs00, sensing voltage difference DELTA Vs4 can be greater than sensing voltage difference DELTA Vs1, so the 4th signal to noise ratio snr 4 should be able to be greater than the first signal to noise ratio snr 1.
Then illustrate respectively various node N00 and N11 with different types as for Fig. 5 A to Fig. 5 C, the mode of its electrode shape by changing sense wire and drive wire to be increasing its contact area, but not as limit.
Next, please refer to Fig. 6, Fig. 6 is that the drive wire (electrode) that illustrates the capacitive touch control display device in another preferred embodiment of the present invention is arranged synoptic diagram with the node that sense wire (electrode) overlaps to form.In this embodiment, those sense wires of capacitive touch control display device are adopted great-jump-forward and are arranged.It should be noted that what Fig. 6 illustrated only is one embodiment of the invention, drive wire (electrode) is arranged with the node of sense wire (electrode) also can other different types, not as limit.
As shown in Figure 6, drive wire Y0～Y7 and sense wire X0～X15 arrange according to horizontal direction and vertical direction respectively.Sense wire X0～X15 can be divided into 8 groups of sense wires altogether, is respectively from left to right: the 1st group of sense wire X0 and X1, the 2nd group of sense wire X2 and X3, the 3rd group of sense wire X4 and X5, the 4th group of sense wire X6 and X7, the 5th group of sense wire X8 and X9, the 6th group of sense wire X10 and X11, the 7th group of sense wire X12 and X13, the 8th group of sense wire X14 and X15.
It should be noted that, two sense wires (for example X0 and X1) in each group sense wire are staggered toward each other, and two sense wire is all corresponding to same cribbing point (first row node N00 for example, N11, N02, N13, N04, N15, N06, N17), wherein a sense wire (for example X0) connects the N00 in the first row node, N02, N04 and N06, (for example X1) then connects the N11 in the first row node as for another sense wire, N13, N15 and N17, that is two sense wires (for example X0 and X1) are all adopted great-jump-forward and are cross-linked each node in the same cribbing point.
As shown in Figure 6, sense wire X0～X15 and drive wire Y0～Y7 altogether be formed with 64 node N00, N11, N02, N13 ..., N146 and N157.Compared to the prior art of Fig. 2, although the interstitial content of Fig. 6 and drive wire number with shown in Figure 2 the same, the sense wire number of Fig. 6 obviously drive wire number more shown in Figure 2 has more one times.Please refer to Fig. 7, Fig. 7 is the synoptic diagram that illustrates a kind of pattern of the drive wire of this embodiment and the electrode lay-out of sense wire (layout).It should be noted that as space is limited, Fig. 7 only draws local drive wire Y0～Y3 and the part of sense wire X0～X7.
In more detail, take two sense wire X0 of same group and X1 as example, sense wire X0 overlaps to form node N00 and N02 with drive wire Y0 and Y2 respectively, and sense wire X1 then overlaps to form node N11 and N13 with drive wire Y1 and Y3 respectively, all the other all can the rest may be inferred, do not give unnecessary details separately in this.
If take two drive wire Y0 of adjacent arrangement and Y1 as example, drive wire Y0 respectively with sense wire X0, X2, X4 ..., X14 overlap to form node N00, N20, N40 ..., N140, and drive wire Y1 respectively with sense wire X1, X3, X5 ..., X15 overlap to form node N11, N31 ..., N151, all the other all can the rest may be inferred, do not give unnecessary details separately in this.
What need to specify is, under the same time, adjacent two drive wire Y0 and Y1 are in order to input respectively the driving voltage V with out of phase and different voltages
D0And V
D1In practical application, the driving voltage V under the same time
D0And V
D1Big or small visual actual demand adjust, as long as driving voltage V
D0Phase place and V
D1Phase place different, can reach the effect that promotes signal to noise ratio (S/N ratio).
Because the driving voltage V of drive wire Y0 input
D0The node N00 that itself and sense wire X0 overlap to form that flows through, thus will be coupled out Inductance and Capacitance in node N00 place, and and then on sense wire X0, be coupled out sensing voltage Vs00.Driving voltage V as for drive wire Y1 input
D1The node N11 that itself and sense wire X1 overlap to form that flows through, thus will be coupled out Inductance and Capacitance in node N11 place, and and then on sense wire X1, be coupled out sensing voltage Vs11.Therefore, sensing circuit SC respectively self-induction survey line X0 and sense wire X1 receives sensing voltage Vs00 and Vs11, and sensing voltage Vs00 and Vs11 are subtracted each other to obtain the sensing voltage difference.It should be noted that the resulting sensing voltage difference of sensing circuit SC will affect the size of its signal to noise ratio (S/N ratio), when the sensing voltage difference increased, it is large that its signal to noise ratio (S/N ratio) also can become thereupon.
In practical application, sensing circuit SC comprises differential motion amplifying unit DA, and differential motion amplifying unit DA comprise first input end+, the second input end-and output terminal OUT.Behind first input end+and the second input end-receive respectively sensing voltage Vs00 and Vs11, differential motion amplifying unit DA deducts Vs11 with after obtaining the sensing voltage difference and the sensing voltage difference being amplified with sensing voltage Vs00, by the sensing voltage difference after the output terminal OUT output amplification, and through behind the follow-up signal handler, judge according to this whether capacitance type touch-control panel is touched.
Compared to prior art, capacitive touch control display device according to the present invention is changed into great-jump-forward and is staggered by the configuration of electrodes of the drive wire of capacitance type touch control sensor or sense wire is arranged by formal style chessboard originally, so that the sensing voltage that adjacent sensing electrode senses under the same time can be respectively from the different driving electrode that different driving voltage is provided, that is the sensing voltage that adjacent sensing electrode senses can have out of phase, therefore, sensing circuit not only can effectively fall low noise impact after the sensing voltage of the adjacent sensing electrode of differential input is subtracted each other, signal itself can't be lowered, so its signal to noise ratio (S/N ratio) can effectively be significantly improved.Thus, capacitance type touch control sensor of the present invention can carry out the sensing of touch points more exactly for capacitance type touch-control panel, significantly to reduce the probability of its erroneous judgement.
By the above detailed description of preferred embodiments, be to wish more to know to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention wish application.
Claims (20)
1. capacitive touch control display device comprises:
One capacitance type touch-control panel; And
One capacitance type touch control sensor is arranged on this capacitance type touch-control panel, and this capacitance type touch control sensor comprises:
A plurality of drive wires, comprise one group of drive wire arranging according to a first direction, this group drive wire is to be made of relatively staggered one first drive wire and one second drive wire, under the time, this first drive wire and this second drive wire have respectively one first driving voltage and one second driving voltage of out of phase and different voltages in order to input;
A plurality of sense wires, comprise one first sense wire and one second sense wire according to the adjacent arrangement of a second direction, this first sense wire and this first drive wire overlap to form a first node, this second sense wire and this second drive wire overlap to form a Section Point, this first node and this Section Point are coupled out respectively one first Inductance and Capacitance and one second Inductance and Capacitance, and this first Inductance and Capacitance and this second Inductance and Capacitance are coupled out respectively one first sensing voltage and one second sensing voltage, and export this first sensing voltage and this second sensing voltage by this first sense wire and this second sense wire respectively; And
One sensing circuit is coupled to this a plurality of sense wires, and this sensing circuit receives this first sensing voltage and this second sensing voltage and this first sensing voltage and this second sensing voltage are subtracted each other, to obtain a sensing voltage difference.
2. capacitive touch control display device as claimed in claim 1, when this sensing voltage difference that wherein obtains when this sensing circuit increased, the corresponding signal to noise ratio (S/N ratio) of this sensing voltage difference also increased thereupon.
3. capacitive touch control display device as claimed in claim 1, if wherein this first driving voltage and this second driving voltage all have positive phase, this sensing voltage difference levels off to this first sensing voltage and deducts the value of this second sensing voltage, and this sensing voltage difference is corresponding to one first signal to noise ratio (S/N ratio).
4. capacitive touch control display device as claimed in claim 1, if wherein to have positive phase and this second driving voltage be zero to this first driving voltage, this sensing voltage difference levels off to the value of this first sensing voltage, and this sensing voltage difference is corresponding to one second signal to noise ratio (S/N ratio).
5. capacitive touch control display device as claimed in claim 1, if wherein this first driving voltage has positive phase and this second driving voltage has minus phase, this sensing voltage difference levels off to this first sensing voltage and adds the value of this second sensing voltage, and this sensing voltage difference is corresponding to one the 3rd signal to noise ratio (S/N ratio).
6. capacitive touch control display device as claimed in claim 1, if wherein this first driving voltage be zero and this second driving voltage have minus phase, this sensing voltage difference levels off to the value of this second sensing voltage, and this sensing voltage difference is corresponding to one the 4th signal to noise ratio (S/N ratio).
7. such as claim 3 or 4 described capacitive touch control display devices, wherein this second signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
8. such as claim 3 or 5 described capacitive touch control display devices, wherein the 3rd signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
9. such as claim 3 or 6 described capacitive touch control display devices, wherein the 4th signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
10. capacitive touch control display device as claimed in claim 1, wherein this sensing circuit comprises a differential motion amplifying unit, this differential motion amplifying unit comprises a first input end, one second input end and an output terminal, after this first input end and this second input end receive respectively this first sensing voltage and this second sensing voltage, this differential motion amplifying unit deducts this second sensing voltage to obtain this sensing voltage difference also with after this sensing voltage difference amplification, this sensing voltage difference after being amplified by this output terminal output with this first sensing voltage.
11. a capacitive touch control display device comprises:
One capacitance type touch-control panel; And
One capacitance type touch control sensor is arranged on this capacitance type touch-control panel, and this capacitance type touch control sensor comprises:
A plurality of drive wires, comprise one first drive wire and one second drive wire according to the adjacent arrangement of a first direction, under the time, this first drive wire and this second drive wire have respectively one first driving voltage and one second driving voltage of out of phase and different voltages in order to input;
A plurality of sense wires, comprise one group of sense wire arranging according to a second direction, this group sense wire comprises relatively staggered one first sense wire and one second sense wire, this first sense wire and this first drive wire overlap to form a first node, this second sense wire and this second drive wire overlap to form a Section Point, this first node and this Section Point are coupled out respectively one first Inductance and Capacitance and one second Inductance and Capacitance, and this first Inductance and Capacitance and this second Inductance and Capacitance are coupled out respectively one first sensing voltage and one second sensing voltage, and export this first sensing voltage and this second sensing voltage by this first sense wire and this second sense wire respectively; And
One sensing circuit is coupled to this a plurality of sense wires, and this sensing circuit receives this first sensing voltage and this second sensing voltage and this first sensing voltage and this second sensing voltage are subtracted each other, to obtain a sensing voltage difference.
12. capacitive touch control display device as claimed in claim 11, when this sensing voltage difference that wherein obtains when this sensing circuit increased, the corresponding signal to noise ratio (S/N ratio) of this sensing voltage difference also increased thereupon.
13. capacitive touch control display device as claimed in claim 11, if wherein this first driving voltage and this second driving voltage all have positive phase, this sensing voltage difference levels off to this first sensing voltage and deducts the value of this second sensing voltage, and this sensing voltage difference is corresponding to one first signal to noise ratio (S/N ratio).
14. capacitive touch control display device as claimed in claim 11, if wherein to have positive phase and this second driving voltage be zero to this first driving voltage, this sensing voltage difference levels off to the value of this first sensing voltage, and this sensing voltage difference is corresponding to one second signal to noise ratio (S/N ratio).
15. capacitive touch control display device as claimed in claim 11, if wherein this first driving voltage has positive phase and this second driving voltage has minus phase, this sensing voltage difference levels off to this first sensing voltage and adds the value of this second sensing voltage, and this sensing voltage difference is corresponding to one the 3rd signal to noise ratio (S/N ratio).
16. capacitive touch control display device as claimed in claim 11, if wherein this first driving voltage be zero and this second driving voltage have minus phase, this sensing voltage difference levels off to the value of this second sensing voltage, and this sensing voltage difference is corresponding to one the 4th signal to noise ratio (S/N ratio).
17. such as claim 13 or 14 described capacitive touch control display devices, wherein this second signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
18. such as claim 13 or 15 described capacitive touch control display devices, wherein the 3rd signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
19. such as claim 13 or 16 described capacitive touch control display devices, wherein the 4th signal to noise ratio (S/N ratio) is greater than this first signal to noise ratio (S/N ratio).
20. capacitive touch control display device as claimed in claim 11, wherein this sensing circuit comprises a differential motion amplifying unit, this differential motion amplifying unit comprises a first input end, one second input end and an output terminal, after this first input end and this second input end receive respectively this first sensing voltage and this second sensing voltage, this differential motion amplifying unit deducts this second sensing voltage to obtain this sensing voltage difference also with after this sensing voltage difference amplification, this sensing voltage difference after being amplified by this output terminal output with this first sensing voltage.
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| TW100137563 | 2011-10-17 | ||
| TW100137563A TWI459272B (en) | 2011-10-17 | 2011-10-17 | Capacitive touch display apparatus |
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| CN103049148A true CN103049148A (en) | 2013-04-17 |
| CN103049148B CN103049148B (en) | 2015-09-09 |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201317868A (en) | 2013-05-01 |
| TWI459272B (en) | 2014-11-01 |
| CN103049148B (en) | 2015-09-09 |
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