CN101930136B - Touch control type liquid crystal display (LCD) and operating method thereof - Google Patents
Touch control type liquid crystal display (LCD) and operating method thereof Download PDFInfo
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- CN101930136B CN101930136B CN2009101496889A CN200910149688A CN101930136B CN 101930136 B CN101930136 B CN 101930136B CN 2009101496889 A CN2009101496889 A CN 2009101496889A CN 200910149688 A CN200910149688 A CN 200910149688A CN 101930136 B CN101930136 B CN 101930136B
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Abstract
The invention relates to a touch control type liquid crystal display (LCD) and an operating method thereof. The touch control type LCD comprises a gate driver, a plurality of sensing units and a judging unit, wherein the gate driver is used for generating a scanning signal; each sensing unit comprises a data reading line, a liquid crystal capacitor, a first switching transistor, a second switching transistor and a third switching transistor; when the scanning signal switches the first switching transistor on, bias voltage is used for charging the liquid crystal capacitor by the first switching transistor; and when the scanning signal switches the third switching transistor on, the bias voltage is used for generating dynamic current to the data reading line by the third switching transistor and the second switching transistor; the judging unit is used for judging whether the sensing units are touched and pressed or not according to the dynamic current; and when the first switching transistor is not switched on and the sensing units are not touched and pressed, the bias voltage of the liquid crystal capacitor is zero.
Description
Technical field
The present invention relates to a kind of LCD, particularly a kind of touch-control liquid crystal display and How It Works thereof.
Background technology
In recent years, LCD has become one of main member of various consumption electronic product, and the appearance of touch-control liquid crystal display has further promoted the ease of use of LCD.In the known touch-control liquid crystal display, extra Trackpad must be set in addition, and change to judge the position coordinates of touch point through the magnitude of voltage that detects touch point on the Trackpad.Yet the Trackpad of extra setting will increase the thickness of LCD and reduce the transmittance of LCD.
For addressing the above problem, industry has proposed in-building type optical touch control type LCD.In this kind optical touch control type LCD, be provided with optical sensor and distribute with the light intensity that detects display pannel the place ahead, thus the position of touch point on the judgement display pannel.Yet; Because the Strength Changes of this kind optical touch control type LCD through ambient light is to press the judgement of incident; Therefore judgment mechanism must be set respectively according to the different operation environment; For example under indoor and outdoor different operation environment, because the environment light intensity is obviously different, the decision mechanism that presses incident then need be proofreaied and correct.Preferably, pressing the decision mechanism of incident can be dynamically and automatically proofread and correct according to operating environment, so that the touch control operation of LCD can be more accurately and hommization, yet so will significantly increase the design complexities of product.
Fig. 1 shows the synoptic diagram of another kind of in-building type capacitance touching control formula LCD, comprises a plurality of capacitance sensing line S that vertically are provided with that laterally reach
TAnd S
LTo read the voltage V that delegation and is listed as in the liquid crystal panel respectively
Out(x) and V
Out(y).When liquid crystal panel receives when pressing the liquid crystal capacitance C of touch point
LCCapacitance can change, cause the voltage V that is detected
Out(x) and V
Out(y) produce corresponding variation, thereby detect the incident that presses and and then judgement touch point coordinate.Yet this kind capacitance touching control formula LCD has two problems at least: (1) is because capacitance sensing line S
TAnd S
LHave bigger stray capacitance, this kind structure also is not suitable for large size panel.(2) because Δ C
LC/ C
Ref(Δ C
LC=C
LCVariation) can become with panel size and diminish greatly, so have lower sensitivity and degree of accuracy.
In view of this, the present invention proposes the in-building type touch-control liquid crystal display of a kind of compact, high sensitivity, pinpoint accuracy and simplicity of design.
Summary of the invention
The present invention provides a kind of touch-control liquid crystal display and How It Works thereof, changes the dynamic current variable quantity that is produced through detecting each sensing unit internal cause liquid crystal capacitance, presses the position thereby accurately detect.
The present invention also provides a kind of touch-control liquid crystal display and How It Works thereof, does not wherein receive when pressing when sensing unit, and this sensing unit liquid crystal capacitance operates in zero-bias, thereby improves detection sensitivity.
The present invention provides a kind of touch-control liquid crystal display, comprises gate drivers, a plurality of sensing unit and identifying unit that is arranged.This gate drivers is in order to produce sweep signal.Each sensing unit comprises data read line, first grid polar curve, second grid line, first switching transistor, liquid crystal capacitance, second switch transistor, the 3rd switching transistor and MM CAP; This data read line is in order to the output dynamic current; This first grid polar curve and this second grid line couple this gate drivers and receive this in regular turn and scan signal; This first switching transistor has that control end couples this first grid polar curve, first end couples node and second end couples bias voltage; This liquid crystal capacitance is coupled between this node and the common electric voltage; This second switch transistor has that control end couples this node and first end couples this data read line; The 3rd switching transistor has that control end couples this second grid line, first end couples this bias voltage and second end couples transistorized second end of this second switch.This MM CAP is coupled between this first grid polar curve and this node.This identifying unit couples this data read line and judges according to this dynamic current whether this sensing unit is pressed; Wherein, when this first switching transistor is not unlocked and this sensing unit does not receive when pressing, this liquid crystal capacitance bias voltage is zero.
The present invention also provides a kind of sensing unit of touch-control liquid crystal display, comprises first grid polar curve, second grid line, data read line, liquid crystal capacitance, first switching transistor, second switch transistor, the 3rd switching transistor and MM CAP.This first grid polar curve and this second grid line receive sweep signal in regular turn; This data read line is in order to the output dynamic current; This first switching transistor has control end and couples first end and second end that this first grid polar curve, first end couple this liquid crystal capacitance and couple bias voltage; This second switch transistor has first end and first end that control end couples this liquid crystal capacitance and couples this data read line; The 3rd switching transistor has that control end couples this second grid line, first end couples this bias voltage and second end couples transistorized second end of this second switch; This MM CAP is coupled between first end and this first grid polar curve of this liquid crystal capacitance; Wherein, this dynamic current is in order to judge whether this sensing unit is pressed; When this first switching transistor is not unlocked and this sensing unit does not receive when pressing, this liquid crystal capacitance bias voltage is zero.
The present invention also provides a kind of How It Works of touch-control liquid crystal display; This touch-control liquid crystal display comprises a plurality of sensing units that are arranged, and each sensing unit comprises first grid polar curve and second grid line and receives sweep signal, liquid crystal capacitance, first switching transistor in regular turn and have control end and couple first end and second end that this first grid polar curve, first end couple this liquid crystal capacitance and couple bias voltage; The second switch transistor has first end, first end output dynamic current that control end couples this liquid crystal capacitance; The 3rd switching transistor has that control end couples this second grid line and first end couples this bias voltage and second end couples transistorized second end of this second switch; This How It Works comprises the following step: at very first time interval; Utilize this to scan signal and open this first switching transistor through this first grid polar curve, this bias voltage is to this liquid crystal capacitance charging; In second time interval, utilize this to scan signal and close this first switching transistor so that the voltage of this liquid crystal capacitance changes through this first grid polar curve; And in the 3rd time interval, utilize this to scan signal and open the 3rd switching transistor through this second grid line, this bias voltage produces this dynamic current through this second and third switching transistor; And judge according to this dynamic current whether sensing unit is pressed, and wherein not receiving when pressing when sensing unit, this liquid crystal capacitance will be changed to zero-bias in second time interval.
Above-mentioned touch-control liquid crystal display also comprises array substrate and colored filter substrate, and wherein this bias voltage can couple the common electric voltage of this array substrate, and this common electric voltage can couple the common electric voltage of this colored filter substrate.This bias voltage is set at that to be higher than this common electric voltage predeterminated voltage poor; Thereby feasible sensing unit when this touch-control liquid crystal display does not receive when pressing; This liquid crystal capacitance is maintained zero-bias, and wherein this predeterminated voltage difference determines peak value, this liquid crystal capacitance value and this storage capacitance value according to the peak that this scans signal.
Description of drawings
Fig. 1 shows the partial circuit figure of known touch control type LCD panel.
Fig. 2 a shows the synoptic diagram the when liquid crystal molecule in the liquid crystal indicator receives none zero bias.
Fig. 2 b shows the synoptic diagram the when liquid crystal molecule in the liquid crystal indicator receives zero-bias.
Fig. 2 c shows that liquid crystal indicator receives the synoptic diagram that external force presses.
Fig. 3 shows the calcspar of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 4 shows the partial circuit figure of sensing unit of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 5 shows the time sequences figure of sensing unit of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 6 a figure shows the running synoptic diagram of sensing unit in very first time interval of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 6 b shows the running synoptic diagram of sensing unit in second time interval of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 6 c shows the running synoptic diagram of sensing unit in the 3rd time interval of the touch-control liquid crystal display of the embodiment of the invention.
Fig. 7 shows that the switching transistor of sensing unit of touch-control liquid crystal display of the embodiment of the invention is in the conducting state of different time at interval.
Embodiment
In order to let above-mentioned and other purposes of the present invention, characteristic and the advantage can be more obvious, hereinafter elaborates conjunction with figs. as follows.
Ultimate principle of the present invention at first is described.In the in-building type capacitance touching control formula LCD, the capacitance change when the increase panel is pressed can increase detection sensitivity and degree of accuracy relatively.
Please with reference to shown in Fig. 2 a to 2c, the skeleton diagram that it shows liquid crystal indicator respectively comprises two transparent substrates and is located in a plurality of liquid crystal molecules between two transparent substrates; For the purpose of simplifying the description, other members have been omitted among Fig. 2 a to 2c.Fig. 2 a shows the synoptic diagram the when liquid crystal between two transparent substrates receives the 5V bias voltage, and the effective dielectric constant (dielectric constant) of hypothesis liquid crystal molecule this moment is ε
//Fig. 2 b shows the synoptic diagram the when liquid crystal between two transparent substrates receives zero-bias (no-bias), and the effective dielectric constant of hypothesis liquid crystal molecule this moment is ε
⊥Fig. 2 c shows when the top transparent substrates receives external force and presses the variable in distance that the back produces Δ d, and supposes that effective dielectric constant at this moment is ε=(ε
//+ 2 ε
⊥)/3, wherein ε
//＞ε＞ε
⊥
According to capacitance equation C=ε A/d, wherein A is the area of two transparent substrates up and down, and d is the distance between two transparent substrates, and capacitor C is represented liquid crystal capacitance.When under LCD is in none zero bias, receiving external force and pressing (that is be changed to Fig. 2 c from Fig. 2 a), can reduce and cause electric capacity to increase between two glass substrate apart from d, but since effective dielectric constant by ε
//Be changed to ε, it will make electric capacity reduce; The result that two effects offset can produce lower capacitance variations.On the other hand, when under liquid crystal indicator is in zero-bias, receiving external force and pressing (that is be changed to Fig. 2 c from Fig. 2 b), effective dielectric constant will be by ε
⊥Be changed to ε, it will make electric capacity increase; Cooperation can produce bigger capacitance variations because of reducing the electric capacity that is increased apart from d.The present invention promptly utilizes this characteristic to propose a kind of touch liquid crystal display, and when liquid crystal indicator did not receive external force and presses, the liquid crystal capacitance of each sensing unit operated in zero-bias, thereby increases detection sensitivity.
Please with reference to shown in Figure 3, the calcspar that it shows the touch-control liquid crystal display 100 of the embodiment of the invention comprises display panels 101, gate drivers 102, source electrode driver 103 and identifying unit 104.This display panels 101 comprises the sensing unit 110 (as shown in Figure 4) and the pixel cell (not shown) of a plurality of arranged.This gate drivers 102 is through a plurality of gate lines G
1～G
nCouple this display panels 101, and each gate line couples delegation's sensing unit and pixel cell; This gate drivers 102 is through said these gate lines G
1～G
nThe transmission sweep signal drives each row sensing unit and pixel cell of this display panels 101 in regular turn.This source electrode driver 103 is through multiple source polar curve S
1～S
nCouple this display panels 101, and each source electrode line couples a biographies sense unit and a pixel cell; This source electrode driver 103 is through said these source electrode lines S
1～S
nEach row pixel cell that this display panels 101 is provided required voltage when showing.This identifying unit 104 is through a plurality of data read line R
1～R
nReceive in each sensing unit the dynamic current that change in voltage produced because of liquid crystal capacitance; Thereby whether judgement has sensing unit to be pressed and judges the sensing unit position that is pressed; Before wherein sensing unit was pressed, the bias voltage of the liquid crystal capacitance of this sensing unit was zero.In addition, scrutable is that the position that is provided with of this identifying unit 104 is not in order to limit the present invention among Fig. 3.
Please with reference to shown in Figure 4, the synoptic diagram of the sensing unit 110 of the touch-control liquid crystal display 100 of its demonstration embodiment of the invention comprises the first switching transistor T
1, the second switch transistor T
2, the 3rd switching transistor T
3, MM CAP C
s, liquid crystal capacitance C
Lc, two adjacent gate polar curve G
N-1, G
nAnd data read line R
mThis first switching transistor T
1Control end be coupled to this gate lines G
N-1, its first end is coupled to node P; Its second end is coupled to bias voltage V
Bias, the common electric voltage of the array substrate (not shown) of this touch-control liquid crystal display 100 for example.This second switch transistor T
2Control end be coupled to this node P, its first end is coupled to this data read line R
mThe 3rd switching transistor T
3Control end be coupled to this gate lines G
n, its first end is coupled to this first switching transistor T
1Second end (this bias voltage V
Bias); Its second end is coupled to this second switch transistor T
2Second end.This MM CAP C
sFirst end be coupled to this gate lines G
N-1, its second end is coupled to this node P.This liquid crystal capacitance C
LcFirst end be coupled to this node P, its second end is coupled to common electric voltage V
Com, the common electric voltage of the colored filter substrate (not shown) of this touch control type LCD device 100 for example; As previously mentioned, in the present invention, this identifying unit 104 is through this data read line R
mRead dynamic current, as this first switching transistor T
1Be not unlocked and this sensing unit 110 does not receive when pressing, this liquid crystal capacitance C
LcOperate in zero-bias.When this sensing unit 110 is pointed or during the pressing of pointer, this liquid crystal capacitance C
LcTwo interelectrode distances reduce and effective dielectric constant increases this liquid crystal capacitance C
LcCapacitance then be increased significantly.In addition, for making this liquid crystal capacitance C
LcCan operate in zero-bias, this bias voltage V
BiasBe set at and be higher than this common electric voltage V
ComOne predeterminated voltage is poor, shown in (1):
V
Bias=V
Com+ Δ V
g* (C
s/ (C
Lc(0)+C
s)) formula (1)
Wherein, Δ V
gFor the peak of sweep signal to peak value (peak-to-peak value), C
Lc(0) is this liquid crystal capacitance C
LcCapacitance when zero-bias.
Please with reference to shown in Figure 5, it shows the time sequences figure of the touch-control liquid crystal display 100 of the embodiment of the invention, wherein this gate lines G
N-1At very first time interval t
1Receive sweep signal.Then, through second time interval t
2After, this gate lines G
nAt the 3rd time interval t
3Receive this sweep signal.At the 4th time interval t
4, 102 of this gate drivers are sent to next bar gate line (gate lines G with this sweep signal
N+1Or the 1st gate line).As shown in the figure, this peak that scans signal is set at Δ V to peak value
gScrutablely be, after accomplishing once circulation (having scanned all gate lines), this gate lines G
N-1And G
nTo receive sweep signal once more, like time interval t
1'～t
4' shown in, that is this gate lines G
N-1And G
nTo receive sweep signal in the fixed cycle.Dotted line is depicted as the voltage V of node P in this sensing unit 110 among Fig. 5
P
Please with reference to shown in Fig. 6 a to 6c, it is distinguished in the different time interval of displayed map 5, the running synoptic diagram of this sensing unit 110.Fig. 6 a shows very first time interval t
1Interior running synoptic diagram; Fig. 6 b shows second time interval t
2Interior running synoptic diagram; Fig. 6 c shows the 3rd time interval t
3Interior running synoptic diagram.In addition, for ease of explanation, Fig. 7 shows each time interval t
1～t
4(t
1'～t
4') in said these switching transistors T
1～T
3Conducting state.
Please be simultaneously with reference to shown in Fig. 5 to 7, the below How It Works of explanation touch-control liquid crystal display 100 of the present invention, and hypothesis sensing unit 110 is in very first time interval T
1Pressed, so the bias voltage of this node P equals this common electric voltage V before
ComAt very first time interval t
1, this gate lines G
N-1Receive sweep signal, the maximal value of its voltage for example is that 16 volts and minimum value are for example between-8 volts.This moment this switching transistor T
1Conducting, this bias voltage V
Bias, for example 17 volts, to this liquid crystal capacitance C
LcCharging, (Fig. 6 a).In addition, at time interval t
1Interior this second switch transistor T
2Conducting and the 3rd switching transistor T
3Close this common electric voltage V
ComFor example can be 5 volts.
Second time interval t
2For this gate drivers 102 drives this gate lines G
N-1And G
nBetween a period of time at interval, that is this gate lines G
N-1And G
nAll do not receive this and scan signal.At this moment, this first switching transistor T
1And the 3rd switching transistor T
3All not conductings (Fig. 6 b).At time interval t
2In, this gate lines G
N-1Change in voltage be Δ V
g, for example become-8 volts from 16 volts.According to capacitance coupling effect, this liquid crystal capacitance C
LcPartial charge will be released into this MM CAP C
s, and this liquid crystal capacitance C
LcChange in voltage can try to achieve and be Δ V
g* (C
s/ (C
Lc+ C
s)).According to formula (1), the voltage of this node P then is changed to V
Com, therefore, this liquid crystal capacitance C
LcCan operate in zero-bias.
At the 3rd time interval t
3, this gate lines G
nReceive this and scan signal and conducting the 3rd switching transistor T
3(Fig. 6 c); This moment this gate lines G
N-1Do not receive sweep signal, so this first switching transistor T
1Not conducting.This second switch transistor T
2Control end according to the voltage of this node P and conducting.In view of the above, dynamic current I is from this bias voltage V
BiasThe 3rd switching transistor T flows through
3, this second switch transistor T
2And data read line R
mAnd read by this identifying unit 104, and the size of this dynamic current I is by being coupled in this second switch transistor T
2Control end voltage (this node P voltage) decision.104 sizes according to this dynamic current I of this identifying unit judge whether this sensing unit 110 is pressed.
At the 4th time interval t
4, this gate drivers 102 transfers to this gate lines G with sweep signal
nNext bar gate line (gate lines G
N+1Or the 1st gate line), to accomplish the running program of a sensing unit.
Please refer again to shown in Figure 5, when through a scan period, this gate lines G
N-1To receive sweep signal once again, for example time interval t
1'～t
4'.Suppose that this sensing unit 110 received external force and pressed and make this liquid crystal capacitance C this moment
LcIncrease to C
Lc', C wherein
Lc'＞C
LcHere, time interval t
1' during the function mode and the time interval t of this sensing unit 110
1Identical, so repeat no more at this.
At time interval t
2', this gate lines G
N-1And G
nAll do not receive sweep signal, so this first switching transistor T
1And second switch transistor T
2All not conductings (Fig. 6 b).At this moment, this gate lines G
N-1Change in voltage be Δ V
g, for example become-8 volts from 16 volts.According to capacitance coupling effect, this liquid crystal capacitance C
Lc' Partial charge is discharged to this MM CAP C
s, this liquid crystal capacitance C
Lc' change in voltage be Δ V
g* (C
s/ (C
Lc'+C
s)).According to formula (1) and condition C
Lc'＞C
Lc, the voltage of this node P will be than common electric voltage V
ComHeight, as shown in Figure 5.Therefore, at the 3rd time interval t
3', because this second switch transistor T
2Control end be coupled to higher voltage, this identifying unit 104 will can read bigger dynamic current I, so this sensing unit 110 of decidable receives external force and presses.At the 4th time interval t
4' in, because the external force that presses at this sensing unit 110 does not remove the voltage V of this node as yet
pStill be maintained at higher voltage.
In sum, known in-building type capacitance touching control LCD has lower degree of accuracy and sensitivity.The present invention passes through to detect the change in voltage of liquid crystal capacitance in the sensing unit, and because liquid crystal capacitance operates in zero-bias when being pressed, can effectively increase capacitance change.Therefore the present invention can increase sensitivity and the degree of accuracy that touch point is judged.
Though the present invention discloses with previous embodiment, so it is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention, when doing various modification and modification in order to qualification the present invention.Therefore protection scope of the present invention is as the criterion with accompanying claims.
Claims (12)
1. touch-control liquid crystal display comprises:
Gate drivers is in order to produce sweep signal;
A plurality of sensing units that are arranged, each sensing unit comprises:
Data read line is in order to the output dynamic current;
First grid polar curve and second grid line couple said gate drivers and receive said sweep signal in regular turn;
First switching transistor has the control end that couples said first grid polar curve, couples first end of node and couples second end of bias voltage;
Liquid crystal capacitance is coupled between said node and the common electric voltage;
The second switch transistor has the control end that couples said node and couples first end of said data read line;
The 3rd switching transistor has the control end that couples said second grid line, couples first end of said bias voltage and couples second end of transistorized second end of said second switch; And
MM CAP is coupled between said first grid polar curve and said node; And
Identifying unit couples said data read line and judges according to said dynamic current whether said sensing unit is pressed;
Wherein, when said first switching transistor is not unlocked and said sensing unit does not receive when pressing, said liquid crystal capacitance bias voltage is zero,
Wherein, it is poor that said bias voltage is higher than said common electric voltage one predeterminated voltage.
2. touch-control liquid crystal display according to claim 1 also comprises the colored filter substrate, and wherein said common electric voltage is the common electric voltage of said colored filter substrate.
3. touch-control liquid crystal display according to claim 1, wherein, said predeterminated voltage difference is according to the value decision of said liquid crystal capacitance and said MM CAP.
4. touch-control liquid crystal display according to claim 1, wherein, when said sweep signal is opened said the 3rd switching transistor, said bias voltage through the said the 3rd and the second switch transistor produce said dynamic current.
5. the sensing unit of a touch-control liquid crystal display comprises:
First grid polar curve and second grid line receive sweep signal in regular turn;
Data read line is in order to the output dynamic current;
Liquid crystal capacitance;
First switching transistor, first end of first end that have the control end that couples said first grid polar curve, couples said liquid crystal capacitance and couple second end of bias voltage;
The second switch transistor has the control end of first end that couples said liquid crystal capacitance and couples first end of said data read line; And
The 3rd switching transistor has the control end that couples said second grid line, couples first end of said bias voltage and couples second end of transistorized second end of said second switch; And
MM CAP is coupled between first end and said first grid polar curve of said liquid crystal capacitance;
Wherein, said dynamic current is in order to judge whether said sensing unit is pressed; When said first switching transistor is not unlocked and said sensing unit does not receive when pressing, said liquid crystal capacitance bias voltage is zero,
Wherein, second end of said liquid crystal capacitance couples common electric voltage,
Wherein, it is poor that said bias voltage is higher than said common electric voltage one predeterminated voltage.
6. the sensing unit of touch-control liquid crystal display according to claim 5, wherein, said common electric voltage is the common electric voltage of colored filter substrate.
7. the sensing unit of touch-control liquid crystal display according to claim 5, wherein, said predeterminated voltage difference is according to the value decision of said liquid crystal capacitance and said MM CAP.
8. the sensing unit of touch-control liquid crystal display according to claim 5, wherein, when said sweep signal is opened said the 3rd switching transistor, said bias voltage through the said the 3rd and the second switch transistor produce said dynamic current.
9. the How It Works of a touch-control liquid crystal display, said touch-control liquid crystal display comprises a plurality of sensing units that are arranged, and each sensing unit comprises: first grid polar curve and second grid line receive sweep signal in regular turn; Liquid crystal capacitance; First switching transistor, first end of first end that have the control end that couples said first grid polar curve, couples said liquid crystal capacitance and couple second end of bias voltage; The second switch transistor has the control end of first end that couples said liquid crystal capacitance, first end of output dynamic current; The 3rd switching transistor; Have the control end that couples said second grid line, couple first end of said bias voltage and couple second end of transistorized second end of said second switch; Each sensing unit also comprises first end that is coupled to said liquid crystal capacitance and the MM CAP between the said first grid polar curve, and said How It Works comprises the following step:
At very first time interval, utilize said sweep signal to open said first switching transistor through said first grid polar curve, said bias voltage charges to said liquid crystal capacitance;
In second time interval, utilize said sweep signal to close said first switching transistor so that the voltage of said liquid crystal capacitance changes through said first grid polar curve;
In the 3rd time interval, utilize said sweep signal to open said the 3rd switching transistor through said second grid line, said bias voltage produces said dynamic current through said second and third switching transistor; And
Judge according to said dynamic current whether sensing unit is pressed, wherein,, will be changed to zero-bias at liquid crystal capacitance described in second time interval when said sensing unit does not receive when pressing,
Wherein, second end of said liquid crystal capacitance couples common electric voltage,
Wherein, it is poor that said bias voltage is higher than said common electric voltage one predeterminated voltage.
10. How It Works according to claim 9, wherein, in said second time interval, said liquid crystal capacitance is discharged to said MM CAP so that the voltage of said liquid crystal capacitance changes.
11. How It Works according to claim 9, wherein, said common electric voltage is the common electric voltage of colored filter substrate.
12. How It Works according to claim 9, wherein, each sensing unit also comprises the data read line that receives said dynamic current.
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| CN103677420B (en) * | 2013-12-17 | 2015-12-30 | 合肥京东方光电科技有限公司 | Touch control unit, array base palte, display device and method of toch control |
| CN108415624B (en) | 2018-05-31 | 2020-07-28 | 京东方科技集团股份有限公司 | Touch circuit, touch detection method, display panel and display device |
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| CN101308301A (en) * | 2007-05-17 | 2008-11-19 | 株式会社半导体能源研究所 | Liquid crystal display device |
| CN101419350A (en) * | 2007-10-22 | 2009-04-29 | 株式会社半导体能源研究所 | Display device |
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|---|---|
| CN101930136A (en) | 2010-12-29 |
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