CN101762900A - Liquid crystal display device with touch sensing function and touch sensing method thereof - Google Patents
Liquid crystal display device with touch sensing function and touch sensing method thereof Download PDFInfo
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Abstract
The invention discloses a liquid crystal display device with touch sensing function, comprising a pixel gate line which is used for transmitting a pixel gate line signal, a pixel data line which is used for transmitting a pixel data signal, a pixel unit which is electrically connected with the pixel gate line and the pixel data line and is used for outputting an image signal according to the pixel gate line signal and the pixel data signal, a first sensing gate line which is used for transmitting a first sensing gate signal, a second sensing gate line which is used for transmitting a second sensing gate signal, a bias voltage line which is used for transmitting a bias voltage signal, a sensing unit which is electrically connected with the first sensing gate line, the second sensing gate line and the bias voltage line provides a first analogy sense signal according to the first sensing gate signal, the second sensing gate signal and the bias voltage signal, and a first sense line which is electrically connected with a sensing unit and is used for transmitting the first analogy sense signal.
Description
Technical field
The invention relates to a kind of liquid crystal indicator, refer to a kind of liquid crystal indicator and its touch sensing method of tool touch sensing function especially.
Background technology
Liquid crystal indicator (Liquid Crystal Display, LCD) have that external form is frivolous, advantages such as power saving and low radiation, therefore be widely used on the electronic products such as multimedia player, mobile phone, PDA(Personal Digital Assistant), computer monitor or flat-surface television.In addition, the function of utilizing liquid crystal indicator to carry out the touching input gradually becomes popular, that is the application of touch-type liquid crystal indicator more and more widely.Generally speaking, the contact surface plate of touch-type liquid crystal indicator is based on resistance-type contact surface plate and capacitor-type touch panel.The resistance-type contact surface plate is located touch position with voltage drop, but the multi-point touch sensing function can't be provided.Capacitor-type touch panel comprises inductance capacitance usually, and it will make signal Processing and orient touch position corresponding to the capacitance variations of the inductance capacitance of touch points.
Fig. 1 is the structural representation of known contact surface plate device.As shown in Figure 1, contact surface plate device 100 comprises contact surface plate 101, many sense wires 110, a plurality of inductance capacitance 120, a plurality of storage capacitors 140 and a plurality of comparers 150.When contact surface plate 101 is touched, capacitance corresponding to the inductance capacitance 120 of touch position can change, cause its capacitance voltage and then to change, the variation meeting of this capacitance voltage transfers to corresponding storage capacitors 140 via corresponding sense wire 110, utilizes the capacitance voltage of corresponding comparer 150 execution storage capacitors 140 and the comparison process of reference voltage Vref can produce touching read output signal Sro again.Yet along with the increase of the size of contact surface plate 101, the line resistance of sense wire 110 and then increases, so after the variable quantity of the capacitance voltage of inductance capacitance 120 transfers to storage capacitors 140, can significantly reduce because of the pressure drop of line resistance, causes low touching sensitivity.Because the stray capacitance of sense wire 110 also and then increases, so can make the transmission delay of capacitance voltage more serious in addition, thereby reduce the touching reaction velocity.In addition, frivolous for display device cheaply for pursuing external form, be affixed on the contact surface plate 101 of display panel outward and can't meet the demands.
Summary of the invention
According to embodiments of the invention, it discloses a kind of liquid crystal indicator of tool touch sensing function, and its device comprises: the pixel gates line is used for transmitting a pixel gates signal; Pixel data line is used for transmitting a pixel data signal; Pixel cell is electrically connected on pixel gates line and pixel data line, is used for according to pixel gates signal and pixel data signal to export a signal of video signal; The first sensing gate line is used for transmitting one first sensing signal; The second sensing gate line is used for transmitting one second sensing signal; Bias line is used for transmitting a bias voltage signal; Sensing cell is electrically connected on the first sensing gate line, second sensing gate line and the bias line, is used for comparing read output signal with bias voltage signal so that a first kind to be provided according to the first sensing signal, the second sensing signal; And first sense wire, be electrically connected on sensing cell, be used for transmitting the first kind and compare read output signal.
The present invention discloses a kind of touch sensing method in addition, and the liquid crystal indicator that is used for tool touch sensing function is with the location touch position.This liquid crystal indicator comprises the first sensing gate line that is used for transmitting the first sensing signal, is used for transmitting the second sensing gate line of the second sensing signal, the bias line that is used for transmitting bias voltage signal, sensing cell, sense wire and signal processing circuit.Sensing cell is used for according to the first sensing signal, the second sensing signal and bias voltage signal so that the analogy read output signal to be provided.Sense wire transmission analogy read output signal is to signal processing circuit, and signal processing circuit promptly is used for according to the analogy read output signal with the location touch position.
This kind touch sensing method comprises: a liquid crystal indicator of tool touch sensing function is provided, and this liquid crystal indicator comprises: the first sensing gate line is used for transmitting one first sensing signal; The second sensing gate line is used for transmitting one second sensing signal; Bias line is used for transmitting a bias voltage signal; Sensing cell is used for according to the first sensing signal, the second sensing signal and bias voltage signal so that an analogy read output signal to be provided; And sense wire, be used for transmitting the analogy read output signal; In one first period, provide second sensing signal to the second sensing gate line of tool one first pulse wave; In first period, the bias voltage signal that one second pulse wave that the tool and first pulse wave overlap is provided is to bias line; In first period, sensing cell according to second pulse wave of first pulse wave of the second sensing signal and bias voltage signal to carry out a charging procedure; In one second period, sensing cell is carried out a discharge procedures to produce a sensing voltage; And in one the 3rd period, providing first sensing signal to the first sensing gate line of tool 1 the 3rd pulse wave, sensing cell is fed into described sense wire according to the 3rd pulse wave of the sensing voltage and the first sensing signal so that the analogy read output signal to be provided.
Description of drawings
Fig. 1 is the structural representation of known contact surface plate device;
Fig. 2 is the liquid crystal indicator of the tool touch sensing function of first embodiment of the invention;
Fig. 3 is the work coherent signal waveform synoptic diagram of liquid crystal indicator touchless incident in sense period of Fig. 2, and wherein transverse axis is a time shaft;
Fig. 4 is the work coherent signal waveform synoptic diagram that touch event takes place in sense period the liquid crystal indicator of Fig. 2, and wherein transverse axis is a time shaft;
Fig. 5 is the liquid crystal indicator of the tool touch sensing function of second embodiment of the invention;
Fig. 6 is the liquid crystal indicator of the tool touch sensing function of third embodiment of the invention;
Fig. 7 is the liquid crystal indicator of the tool touch sensing function of fourth embodiment of the invention;
Fig. 8 is the process flow diagram of touch sensing method of the present invention.
The main element symbol description:
100 contact surface plate devices
101 contact surface plates
110,220 sense wires
120 inductance capacitances
140 storage capacitors
150,260,360, comparer
460、560
200 liquid crystal indicators
201 pixel gates lines
202 pixel data line
205 pixel cells
210 sensing gate lines
215 bias lines
230,430 sensing cells
231,431 first electric crystals
232,432 second electric crystals
233,433 the 3rd electric crystals
240 touch sensors
250,350,450,550 signal processing circuits
255,355,455,555 switches
270,370,570 multiplexers
280,380,580 storage unit
290,390,590 signal framing unit
900 flow processs
BLn-1, BLn, BLn+1 bias line
CP_j, CP_m comparer
The Clc liquid crystal capacitance
Cst1 first storage capacitors
Cst2 second storage capacitors
DGLn-1, DGLn, DGLn+1 sensing gate line
DXn_m, DXn+1_m sensing cell
It touches electric current
Qpx pixel electric crystal
RLj, RLm sense wire
S910～S980 step
SDGn-1, SDGn, SDGn+1 sensing signal
Spos touch position signal
Sro touches read output signal
Sroa_j, Sroa_m analogy read output signal
Srod_j, Srod_m numeral read output signal
T1, T2, T3, T4, T3 ', T4 ', T5 period
Vb_n-1, Vb_n, Vb_n+1 bias voltage signal
The Vd sensing voltage
The Vdd high power supply voltage
Vh1 first high voltage
Vh2 second high voltage
The Vref reference voltage
The Vsat saturation voltage
The Vss low supply voltage
The Vth critical voltage
Embodiment
Hereinafter according to liquid crystal indicator and its touch sensing method of tool touch sensing function of the present invention, elaborate especially exemplified by the embodiment conjunction with figs., but the embodiment that is provided not is the scope that contains in order to restriction the present invention, carry out precedence and the method flow number of steps is more non-in order to limit it, any execution flow process that reconfigures by method step, the method with impartial effect that produces is all the scope that the present invention is contained.
Fig. 2 is the liquid crystal indicator of the tool touch sensing function of first embodiment of the invention.As shown in Figure 2, liquid crystal indicator 200 comprises many pixel gates lines 201, many pixel data line 202, a plurality of pixel cell 205, many sensing gate lines 210, many bias lines 215, many sense wires 220, a plurality of sensing cell 230 and signal processing circuits 250.Each bar pixel gates line 201 is used for transmitting the respective pixel signal.Each bar pixel data line 202 is used for transmitting the respective pixel data-signal.Each pixel cell 205 comprises pixel electric crystal Qpx, liquid crystal capacitance Clc and the first storage capacitors Cst1.Pixel electric crystal Qpx can be a membrane transistor or an effect electric crystal.Pixel electric crystal Qpx is electrically connected on respective pixel gate line 201 and respective pixel data line 202, be used for according to of the write running of respective pixel signal, and pixel cell 205 is to export corresponding signal of video signal according to the respective pixel data-signal that is written into control respective pixel data-signal.Each bar sense wire 220 is electrically connected on a plurality of corresponding sensing cells 230, is used for transmitting corresponding analogy read output signal.
Signal processing circuit 250 comprises a plurality of switches 255, a plurality of comparer 260, multiplexer 270, storage unit 280 and signal framing unit 290.Each switch 255 is electrically connected on corresponding sense wire 220, is used for the voltage of corresponding analogy read output signal is reset to low supply voltage Vss.Each comparer 260 comprises positive input terminal, negative input end and output terminal, wherein positive input terminal is used for receiving reference voltage Vref, negative input end is electrically connected on corresponding sense wire 220 to receive corresponding analogy read output signal, output terminal is electrically connected on multiplexer 270, is used for exporting the corresponding digital read output signal that corresponding analogy read output signal and reference voltage Vref comparison are produced.For example, comparator C P_j is electrically connected on sense wire RLj, be used for comparing class than read output signal Sroa_j and reference voltage Vref to produce digital read output signal Srod_j, comparator C P_m then is electrically connected on sense wire RLm, be used for comparing class than read output signal Sroa_m and reference voltage Vref to produce digital read output signal Srod_m.In another embodiment, the positive input terminal of comparer 260 is electrically connected on corresponding sense wire 220 receiving corresponding analogy read output signal, and the negative input end of comparer 260 then is used for receiving reference voltage Vref.Multiplexer 270 is electrically connected on a plurality of comparers 260, is used for exporting a plurality of digital read output signal that a plurality of comparers 260 are produced to storage unit 280 in regular turn.Storage unit 280 is electrically connected on multiplexer 270, is used for storing a plurality of digital read output signal that multiplexer 270 is exported in regular turn.Signal framing unit 290 is electrically connected on storage unit 280, is used for according to a plurality of digital read output signals to produce touch position signal Spos.
In the embodiment shown in Figure 2, all adjacent sensing cell 230 of each pixel cell 205.In another embodiment, sensing cell 230 is many pixel gates lines 201 and being provided with at interval, or many pixel data line 202 and being provided with at interval, that is are not that each pixel cell 205 is all adjacent with sensing cell 230.In like manner, sensing gate line 210 and bias line 215 can be accordingly many pixel gates lines 201 and being provided with at interval, or sense wire 220 can be accordingly many pixel data line 202 and being provided with at interval.Each sensing cell 230 comprises first electric crystal 231, second electric crystal 232, the 3rd electric crystal 233, the second storage capacitors Cst2 and touch sensor 240.First electric crystal 231 and second electric crystal 232 can be N type membrane transistor (Thin Film Transistor) or N type field effect electric crystal (Field Effect Transistor).The 3rd electric crystal 233 can be N type film photoelectric crystal (Photo-transistor) or photoelectric crystal is imitated in N type field.Hereinafter according to coupled relation and the circuit operation principles of sensing cell DXn_m so that each element to be described.
First electric crystal 231 comprises first end, second end and gate terminal, and wherein first end is used for receiving high power supply voltage Vdd, and gate terminal is electrically connected on the second storage capacitors Cst2, and second end is electrically connected on second electric crystal 232.Second electric crystal 232 comprises first end, second end and gate terminal, wherein first end is electrically connected on second end of first electric crystal 231, gate terminal is electrically connected on sensing gate line DGLn-1 to receive sensing signal SDGn-1, and second end is electrically connected on sense wire RLm.The second storage capacitors Cst2 is electrically connected between the gate terminal and sensing gate line DGLn of first electric crystal 231.The 3rd electric crystal 233 comprises first end, second end and gate terminal, and wherein first end is electrically connected on the gate terminal of first electric crystal 231, and gate terminal is electrically connected on sensing gate line DGLn to receive sensing signal SDGn, and second end is electrically connected on bias line BLn.Touch sensor 240 is electrically connected between the gate terminal and bias line BLn of first electric crystal 231.Touch sensor 240 based on contact mechanism or induction type mechanism with the gate terminal that changes first electric crystal 231 and the conduction state between the bias line BLn, and then the size that changes touching electric current I t produces corresponding sensing voltage Vd according to this to adjust the velocity of discharge of the second storage capacitors Cst2.As shown in Figure 2, the stored sensing voltage Vd of the second storage capacitors Cst2 is used for controlling the conduction and cut-off state of first electric crystal 231, and then control is fed into sense wire RLm to set the voltage of analogy read output signal Sroa_m with high power supply voltage Vdd, so the variable quantity of sensing voltage Vd is not influenced by the line resistance of sense wire RLm, in other words, touching sensitivity can not reduce because of the increase of the line resistance of sense wire RLm.In addition, owing to sensing cell 230 is integrated in the display panel that comprises pixel cell 205, thus can make the external form of liquid crystal indicator 200 more frivolous, and can reduce its production cost.
Fig. 3 is the work coherent signal waveform synoptic diagram of liquid crystal indicator 200 touchless incident in sense period of Fig. 2, and wherein transverse axis is a time shaft.In Fig. 3, basipetal signal is respectively sensing signal SDGn-1, sensing signal SDGn, bias voltage signal Vb_n, corresponding to the sensing voltage Vd of low ambient light brightness and corresponding to the sensing voltage Vd of high ambient light brightness.As shown in Figure 3, in period T1, the voltage of sensing signal SDGn is the first high voltage Vh1, the 3rd electric crystal 233 of conducting according to this.This moment, bias voltage signal Vb_n had the second high voltage Vh2 greater than the first high voltage Vh1 with the second storage capacitors Cst2 that charges, sensing voltage Vd thereby rise to saturation voltage Vsat.In period T2, the low-voltage of sensing signal SDGn is ended the 3rd electric crystal 233, and the second storage capacitors Cst2 then can be by the leakage current discharge of the 3rd electric crystal 233, so sensing voltage Vd just reduces gradually from saturation voltage Vsat.Be photoelectric crystal owing to the 3rd electric crystal 233 in addition, so environmental light brightness is high more, the leakage current of the 3rd electric crystal 233 is big more, and the velocity of discharge of the second storage capacitors Cst2 is also fast more, that is the decline rate of sensing voltage Vd is fast more.Therefore, as shown in Figure 3, corresponding to the decline rate of the sensing voltage Vd of high ambient light brightness greater than decline rate corresponding to the sensing voltage Vd of low ambient light brightness, no matter but the height of environmental light brightness, sensing voltage Vd continues the critical voltage Vth greater than first electric crystal 231, in other words, first electric crystal 231 continues to remain on conducting state.
In period T3, the voltage of sensing signal SDGn-1 is that the first high voltage Vh1 is with conducting second electric crystal 232, simultaneously because of sensing voltage Vd still greater than critical voltage Vth with conducting first electric crystal 231, so high power supply voltage Vdd can be via first electric crystal 231 and second electric crystal 232 and is fed into sense wire RLm, that is the voltage of analogy read output signal Sroa_m is pulled to high power supply voltage Vdd.At this moment, to produce digital read output signal Srod_m, digital read output signal Srod_m is sent to storage unit 280 via multiplexer 270 to comparator C P_m with the analogy read output signal Sroa_m of tool high power supply voltage Vdd and reference voltage Vref comparison.After digital read output signal Srod_m is stored in storage unit 280, but inductive switch 255 conductings are reset to low supply voltage Vss with the voltage with analogy read output signal Sroa_m.When all digital read output signals were stored in storage unit 280 in regular turn in sense period after, signal framing unit 290 can be according to the stored a plurality of digital read output signal of storage unit 280 to produce touch position signal Spos.
Fig. 4 is the work coherent signal waveform synoptic diagram that touch event takes place in sense period the liquid crystal indicator 200 of Fig. 2, and wherein transverse axis is a time shaft.In Fig. 4, basipetal signal is respectively sensing signal SDGn-1, sensing signal SDGn, bias voltage signal Vb_n, corresponding to the sensing voltage Vd of low ambient light brightness and corresponding to the sensing voltage Vd of high ambient light brightness.As shown in Figure 4, in period T1, the voltage of sensing signal SDGn is the first high voltage Vh1, the 3rd electric crystal 233 of conducting according to this.This moment, bias voltage signal Vb_n had the second high voltage Vh2 greater than the first high voltage Vh1 with the second storage capacitors Cst2 that charges, sensing voltage Vd thereby rise to saturation voltage Vsat.In period T2 (preposition discharge period), the low-voltage of sensing signal SDGn is ended the 3rd electric crystal 233, the second storage capacitors Cst2 then can be by the leakage current discharge of the 3rd electric crystal 233, so sensing voltage Vd just reduces gradually from saturation voltage Vsat.In like manner, if environmental light brightness is high more, then the leakage current of the 3rd electric crystal 233 is big more, and the velocity of discharge of the second storage capacitors Cst2 is also fast more, that is the decline rate of sensing voltage Vd is fast more.
When touch event takes place when, the second storage capacitors Cst2 is mainly by touching electric current I t rapid discharge, suppose that the period takes place to touch comprises period T3, T4 or period T3 ', T4 ', like this then in period T3 and T4, descend fast corresponding to the sensing voltage Vd of low ambient light brightness, and corresponding to the sensing voltage Vd of high ambient light brightness in period T3 ' and the interior quick decline of T4 '.Sensing voltage Vd is interior still greater than the critical voltage Vth of first electric crystal 231 in period T3/ period T3 ', but sensing voltage Vd is interior then less than the critical voltage Vth of first electric crystal 231, so first electric crystal 231 switches to cut-off state in period T4/ period T4 ' in period T4/ period T4 '.Note that the slippage of sensing voltage Vd in period T2 (preposition discharge period), can make first electric crystal 231 in taking place to switch to cut-off state sooner behind the touch event, the time span that therefore can shorten period T4/ period T4 ' is to promote the touching reaction velocity.In addition, the slippage of sensing voltage Vd in period T2 corresponding to high ambient light brightness, greater than the slippage of sensing voltage Vd in period T2, so after touch event took place, the time span of period T3 ' was shorter than the time span of period T3 corresponding to low ambient light brightness.In other words, environmental light brightness is high more, then touch event takes place after, first electric crystal 231 switches to cut-off state more soon, make according to this touching reaction velocity can adjust according to environmental light brightness.
In period T5, the voltage of sensing signal SDGn-1 is that the first high voltage Vh1 is with conducting second electric crystal 232, but because of sensing voltage Vd less than critical voltage Vth with by first electric crystal 231, so high power supply voltage Vdd can't be via first electric crystal 231 and second electric crystal 232 and is fed into sense wire RLm, that is analogy read output signal Sroa_m remains on low-voltage.At this moment, to produce digital read output signal Srod_m, digital read output signal Srod_m is sent to storage unit 280 via multiplexer 270 to comparator C P_m with the analogy read output signal Sroa_m of tool low-voltage and reference voltage Vref comparison.After digital read output signal Srod_m is stored in storage unit 280, but inductive switch 255 conductings are reset to low supply voltage Vss with the voltage with analogy read output signal Sroa_m.In like manner, when all digital read output signals were stored in storage unit 280 in regular turn in sense period after, signal framing unit 290 can be according to the stored a plurality of digital read output signal of storage unit 280 to produce touch position signal Spos.
Fig. 5 is the liquid crystal indicator of the tool touch sensing function of second embodiment of the invention.As shown in Figure 5, liquid crystal indicator 300 is similar to liquid crystal indicator shown in Figure 2 200, and main difference is signal processing circuit 250 is replaced into signal processing circuit 350.Signal processing circuit 350 comprises a plurality of switches 355, multiplexer 370, comparer 360, storage unit 380 and signal framing unit 390.Each switch 355 is electrically connected on corresponding sense wire 220, is used for the voltage of corresponding analogy read output signal is reset to low supply voltage Vss.Multiplexer 370 is electrically connected on many sense wires 220, is used for exporting a plurality of analogy read output signals to comparer 360 in regular turn.Note that multiplexer shown in Figure 2 270 is digital multiplexer, multiplexer 370 then is an analog multiplexer.Comparer 360 comprises positive input terminal, negative input end and output terminal, wherein positive input terminal is used for receiving reference voltage Vref, negative input end is electrically connected on multiplexer 370 to receive the analogy read output signal in regular turn, output terminal is electrically connected on storage unit 380, is used for the digital read output signal that output class produced than read output signal and reference voltage Vref comparison.In another embodiment, the positive input terminal of comparer 360 is electrically connected on multiplexer 370 receiving the analogy read output signal in regular turn, and the negative input end of comparer 360 then is used for receiving reference voltage Vref.Storage unit 380 is electrically connected on comparer 360, is used for storing the digital read output signal that comparer 360 produces in regular turn.Signal framing unit 390 is electrically connected on storage unit 380, is used for according to a plurality of digital read output signals to produce touch position signal Spos.The signal waveform of sensing signal SDGn-1, sensing signal SDGn, bias voltage signal Vb_n and sensing voltage Vd during liquid crystal indicator 300 runnings roughly is same as Fig. 3 and waveform shown in Figure 4, so repeat no more its principle of work.
Fig. 6 is the liquid crystal indicator of the tool touch sensing function of third embodiment of the invention.As shown in Figure 6, liquid crystal indicator 400 is similar to liquid crystal indicator shown in Figure 2 200, and main difference is a plurality of sensing cells 230 are replaced into a plurality of sensing cells 430, and signal processing circuit 250 is replaced into signal processing circuit 450.The inner structure of sensing cell 430 is similar to sensing cell shown in Figure 2 230, and main difference is first electric crystal 231, second electric crystal 232 and the 3rd electric crystal 233 are replaced into first electric crystal 431, second electric crystal 432 and the 3rd electric crystal 433 respectively.First electric crystal 431 and second electric crystal 432 can be P type membrane transistor or P type field effect electric crystal.The 3rd electric crystal 433 can be P type film photoelectric crystal or photoelectric crystal is imitated in P type field.Except first end of first electric crystal 431 is used for receiving low supply voltage Vss, the relation of coupling of the inner member of sensing cell 430 is same as sensing cell 230.
The inner structure of signal processing circuit 450 is similar to signal processing circuit shown in Figure 2 250, and main difference is a plurality of switches 255 are replaced into a plurality of switches 455, and a plurality of comparers 260 are replaced into a plurality of comparers 460.Each switch 455 is electrically connected on corresponding sense wire 220, is used for the voltage of corresponding analogy read output signal is reset to high power supply voltage Vdd.Each comparer 460 comprises positive input terminal, negative input end and output terminal, wherein negative input end is used for receiving reference voltage Vref, positive input terminal is electrically connected on corresponding sense wire 220 to receive corresponding analogy read output signal, output terminal is electrically connected on multiplexer 270, is used for exporting the corresponding digital read output signal that corresponding analogy read output signal and reference voltage Vref comparison are produced.In another embodiment, the positive input terminal of comparer 460 is used for receiving reference voltage Vref, and the negative input end of comparer 460 then is electrically connected on corresponding sense wire 220 to receive corresponding analogy read output signal.All the other of signal processing circuit 450 relation of coupling is same as signal processing circuit 250 with the signal Processing running.The signal waveform of sensing signal SDGn-1, sensing signal SDGn, bias voltage signal Vb_n and sensing voltage Vd during liquid crystal indicator 400 runnings, roughly corresponding to the inversion waveforms up and down of the waveform of Fig. 3 and Fig. 4, for example sensing signal SDGn and the waveform of bias voltage signal Vb_n in period T1 are negative pulse wave, but not Fig. 3 and positive pulse wave shown in Figure 4.In addition, the charging running of the second stored voltage Cst2 in period T1, with so that sensing voltage Vd drops to saturation voltage Vsat, the discharge in period T2 operate then with so that sensing voltage Vd rise gradually from saturation voltage Vsat.
Fig. 7 is the liquid crystal indicator of the tool touch sensing function of fourth embodiment of the invention.As shown in Figure 7, liquid crystal indicator 500 is similar to liquid crystal indicator shown in Figure 6 400, and main difference is signal processing circuit 450 is replaced into signal processing circuit 450.Signal processing circuit 550 comprises a plurality of switches 555, multiplexer 570, comparer 560, storage unit 580 and signal framing unit 590.Each switch 555 is electrically connected on corresponding sense wire 220, is used for the voltage of corresponding analogy read output signal is reset to high power supply voltage Vdd.Multiplexer 570 is electrically connected on many sense wires 220, is used for exporting a plurality of analogy read output signals to comparer 560 in regular turn.Note that multiplexer shown in Figure 6 270 is digital multiplexer, multiplexer 570 then is an analog multiplexer.Comparer 560 comprises positive input terminal, negative input end and output terminal, wherein negative input end is used for receiving reference voltage Vref, positive input terminal is electrically connected on multiplexer 570 to receive the analogy read output signal in regular turn, output terminal is electrically connected on storage unit 580, is used for the digital read output signal that output class produced than read output signal and reference voltage Vref comparison.In another embodiment, the positive input terminal of comparer 560 is used for receiving reference voltage Vref, and the negative input end of comparer 560 then is electrically connected on multiplexer 570 to receive the analogy read output signal in regular turn.Storage unit 580 is electrically connected on comparer 560, is used for storing the digital read output signal that comparer 560 produces in regular turn.Signal framing unit 590 is electrically connected on storage unit 580, is used for according to a plurality of digital read output signals to produce touch position signal Spos.Remove the inner structure and the circuit running of above-mentioned signal processing circuit 550, all the other structures of liquid crystal indicator 500 and circuit running are same as liquid crystal indicator 400, repeat no more.
Fig. 8 is the process flow diagram of touch sensing method of the present invention.Flow process 900 shown in Figure 8 is the touch sensing method of the liquid crystal indicator 500 of the liquid crystal indicator 400 of liquid crystal indicator 300, Fig. 6 of liquid crystal indicator 200, Fig. 5 based on Fig. 2 or Fig. 7.Touch sensing method shown in the flow process 900 comprises the following step:
Step S910: in first period, the sensing signal SDGn that tool first pulse wave is provided is to sensing gate line DGLn;
Step S920: in first period, the bias voltage signal Vb_n that second pulse wave that the tool and first pulse wave overlap is provided is to bias line BLn;
Step S930: in first period, sensing cell according to second pulse wave of first pulse wave of sensing signal SDGn and bias voltage signal Vb_n to carry out charging procedure;
Step S940: in second period, sensing cell is carried out discharge procedures to produce sensing voltage Vd;
Step S950: in the 3rd period, the sensing signal SDGn-1 that tool the 3rd pulse wave is provided is to sensing gate line DGLn-1, and sensing cell is fed into sense wire RLm according to the 3rd pulse wave of sensing voltage Vd and sensing signal SDGn-1 so that analogy read output signal Sroa_m to be provided;
Step S960: in the 3rd period, signal processing circuit is converted to digital read output signal Srod_m with analogy read output signal Sroa_m;
Step S970: in the 4th period, signal processing circuit produces touch position signal Spos according to digital read output signal Srod_m; And
Step S980: in the 4th period, signal processing circuit resets to low supply voltage Vss or high power supply voltage Vdd with the voltage of analogy read output signal Sroa_m.
In the flow process 900 of above-mentioned touch sensing method, discharge procedures is controlled by environmental light brightness and/or touch event.In one embodiment, when touch event does not take place in liquid crystal indicator in second period, sensing cell will be output as analogy read output signal Sroa_m greater than the high power supply voltage Vdd of reference voltage Vref in the 3rd period, and when liquid crystal indicator in second period touch event took place, the voltage of the analogy read output signal Sroa_m that sensing cell was provided in the 3rd period was less than reference voltage Vref.In another embodiment, when touch event does not take place in liquid crystal indicator in second period, sensing cell will be output as analogy read output signal Sroa_m less than the low supply voltage Vss of reference voltage Vref in the 3rd period, and when liquid crystal indicator in second period touch event took place, the voltage of the analogy read output signal Sroa_m that sensing cell was provided in the 3rd period was greater than reference voltage Vref.
In sum, in the running of the sensing cell of liquid crystal indicator of the present invention, sensing voltage system is used for the conduction and cut-off state of first electric crystal of sense of control measurement unit, and then control is fed into sense wire to set the voltage of analogy read output signal with high power supply voltage or low supply voltage, so the variable quantity of sensing voltage is not influenced by the line resistance of sense wire, that is touching sensitivity can not reduce because of the increase of the line resistance of sense wire.In addition, sensing voltage can be by discharge procedures more near critical voltage, so can promote the touching reaction velocity before touch event takes place.In addition, the sensing cell of liquid crystal indicator of the present invention system is integrated in the display panel that comprises pixel cell, thus can make its external form more frivolous, and can reduce production costs.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any have a technical field of the invention know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (20)
1. the liquid crystal indicator of a tool touch sensing function is characterized in that, described liquid crystal indicator comprises:
One pixel gates line is used for transmitting a pixel gates signal;
One pixel data line is used for transmitting a pixel data signal;
One pixel cell is electrically connected on described pixel gates line and described pixel data line, is used for according to described pixel gates signal and described pixel data signal to export a signal of video signal;
One first sensing gate line is used for transmitting one first sensing signal;
One second sensing gate line is used for transmitting one second sensing signal;
One bias line is used for transmitting a bias voltage signal;
One sensing cell, be electrically connected on the described first sensing gate line, the described second sensing gate line and described bias line, be used for comparing read output signal with described bias voltage signal so that a first kind to be provided according to the described first sensing signal, the described second sensing signal; And
One first sense wire is electrically connected on described sensing cell, is used for transmitting the described first kind and compares read output signal.
2. liquid crystal indicator as claimed in claim 1 is characterized in that, described liquid crystal indicator also comprises:
One second reading outlet is used for transmitting one second analogy read output signal;
One first switch is electrically connected on described first sense wire, is used for the described first kind is reset to a supply voltage than the voltage of read output signal;
One second switch is electrically connected on described second reading outlet, is used for the voltage of the described second analogy read output signal is reset to described supply voltage;
One first comparer is electrically connected on described first sense wire, be used for the more described first kind than read output signal and a reference voltage to produce one first digital read output signal; And
One second comparer is electrically connected on described second reading outlet, is used for more described second analogy read output signal and described reference voltage to produce one second digital read output signal;
Wherein said supply voltage is a low supply voltage or a high power supply voltage.
3. liquid crystal indicator as claimed in claim 2 is characterized in that, described liquid crystal indicator also comprises:
One multiplexer is electrically connected on described first comparer and described second comparer, is used for exporting in regular turn the described first digital read output signal and the described second digital read output signal;
One storage unit is electrically connected on described multiplexer, is used for storing the described first digital read output signal and the described second digital read output signal that described multiplexer is exported in regular turn; And
One signal framing unit is electrically connected on described storage unit, is used for producing a touch position signal according to the described first digital read output signal and the described second digital read output signal.
4. liquid crystal indicator as claimed in claim 1 is characterized in that, described liquid crystal indicator also comprises:
One second reading outlet is used for transmitting one second analogy read output signal;
One first switch is electrically connected on described first sense wire, is used for the described first kind is reset to a supply voltage than the voltage of read output signal;
One second switch is electrically connected on described second reading outlet, is used for the voltage of the described second analogy read output signal is reset to described supply voltage;
One multiplexer is electrically connected on described first sense wire and described second reading outlet, is used for exporting in regular turn the described first kind than read output signal and the described second analogy read output signal; And
One comparer, be electrically connected on described multiplexer, be used for the more described first kind than read output signal and a reference voltage producing one first digital read output signal, and be used for the more described second analogy read output signal and described reference voltage to produce one second digital read output signal;
Wherein said supply voltage is a low supply voltage or a high power supply voltage.
5. liquid crystal indicator as claimed in claim 4 is characterized in that, described liquid crystal indicator also comprises:
One storage unit is electrically connected on described comparer, is used for storing the described first digital read output signal and the described second digital read output signal that described comparer produces in regular turn; And
One signal framing unit is electrically connected on described storage unit, is used for producing a touch position signal according to the described first digital read output signal and the described second digital read output signal.
6. liquid crystal indicator as claimed in claim 1 is characterized in that, described sensing cell comprises:
One first electric crystal comprises one first end, one second end and a gate terminal, and wherein said first end is used for receiving a supply voltage;
One second electric crystal, comprise one first end, one second end and a gate terminal, wherein said first end is electrically connected on second end of described first electric crystal, described gate terminal is electrically connected on the described first sensing gate line to receive the described first sensing signal, and described second end is electrically connected on described first sense wire;
One storage capacitors is electrically connected between the gate terminal and the described second sensing gate line of described first electric crystal;
One the 3rd electric crystal, comprise one first end, one second end and a gate terminal, wherein said first end is electrically connected on the gate terminal of described first electric crystal, described gate terminal is electrically connected on the described second sensing gate line to receive the described second sensing signal, and described second end is electrically connected on described bias line; And
One touch sensor is electrically connected between the gate terminal and described bias line of described first electric crystal.
7. liquid crystal indicator as claimed in claim 6 is characterized in that, wherein
Described first electric crystal and described second electric crystal are N type membrane transistor or N type field effect electric crystal; And
Described the 3rd electric crystal is that photoelectric crystal is imitated in N type film photoelectric crystal or N type field.
8. liquid crystal indicator as claimed in claim 7 is characterized in that, the described supply voltage that first end of described first electric crystal is received is a high power supply voltage.
9. liquid crystal indicator as claimed in claim 6 is characterized in that, wherein
Described first electric crystal and described second electric crystal are P type membrane transistor or P type field effect electric crystal; And
Described the 3rd electric crystal is that photoelectric crystal is imitated in P type film photoelectric crystal or P type field.
10. liquid crystal indicator as claimed in claim 9 is characterized in that, the described supply voltage that first end of described first electric crystal is received is a low supply voltage.
11. liquid crystal indicator as claimed in claim 6 is characterized in that, described touch sensor based on contact mechanism or induction type mechanism with the gate terminal that changes described first electric crystal and the conduction state between the described bias line.
12. liquid crystal indicator as claimed in claim 1 is characterized in that, described pixel cell comprises:
One electric crystal, comprise one first end, one second end and a gate terminal, wherein said first end is electrically connected on described pixel data line to receive described pixel data signal, and described gate terminal is electrically connected on described pixel gates line to receive described pixel gates signal;
One liquid crystal capacitance is electrically connected on second end of described electric crystal; And
One storage capacitors is electrically connected on second end of described electric crystal.
13. a touch sensing method is characterized in that, described touch sensing method comprises:
One liquid crystal indicator of tool touch sensing function is provided, and described liquid crystal indicator comprises:
One first sensing gate line is used for transmitting one first sensing signal;
One second sensing gate line is used for transmitting one second sensing signal;
One bias line is used for transmitting a bias voltage signal;
One sensing cell is used for according to the described first sensing signal, the described second sensing signal and described bias voltage signal so that an analogy read output signal to be provided; And
One sense wire is used for transmitting described analogy read output signal;
In one first period, the described second sensing signal that tool one first pulse wave is provided is to the described second sensing gate line;
In described first period, the described bias voltage signal that one second pulse wave that tool and described first pulse wave overlap is provided is to described bias line;
In described first period, described sensing cell according to described second pulse wave of described first pulse wave of the described second sensing signal and described bias voltage signal to carry out a charging procedure;
In one second period, described sensing cell is carried out a discharge procedures to produce a sensing voltage; And
In one the 3rd period, the described first sensing signal that tool 1 the 3rd pulse wave is provided is to the described first sensing gate line, and described sensing cell is fed into described sense wire according to described the 3rd pulse wave of described sensing voltage and the described first sensing signal so that described analogy read output signal to be provided.
14. touch sensing method as claimed in claim 13 is characterized in that, described discharge procedures is controlled by the brightness of surround lighting.
15. touch sensing method as claimed in claim 13 is characterized in that, described discharge procedures is controlled by a touch event.
16. touch sensing method as claimed in claim 13 is characterized in that, described liquid crystal indicator comprises a signal processing circuit in addition, and described touch sensing method comprises in addition:
In described the 3rd period, described signal processing circuit is converted to a digital read output signal with described analogy read output signal;
In one the 4th period, described signal processing circuit produces a touch position signal according to described digital read output signal; And
In described the 4th period, described signal processing circuit resets to a low supply voltage or a high power supply voltage with the voltage of described analogy read output signal.
17. touch sensing method as claimed in claim 13, it is characterized in that, wherein if described liquid crystal indicator in described second period touch event does not take place, then described sensing cell will be output as described analogy read output signal greater than a high power supply voltage of a reference voltage in described the 3rd period.
18. touch sensing method as claimed in claim 17, it is characterized in that, wherein if described touch event took place in described second period described liquid crystal indicator, the voltage of the described analogy read output signal that then described sensing cell was provided in described the 3rd period is less than described reference voltage.
19. touch sensing method as claimed in claim 13, it is characterized in that, wherein if described liquid crystal indicator in described second period touch event does not take place, then described sensing cell will be output as described analogy read output signal less than a low supply voltage of a reference voltage in described the 3rd period.
20. touch sensing method as claimed in claim 19, it is characterized in that, wherein if described touch event took place in described second period described liquid crystal indicator, the voltage of the described analogy read output signal that then described sensing cell was provided in described the 3rd period is greater than described reference voltage.
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| CN2010100006955A CN101762900B (en) | 2010-01-15 | 2010-01-15 | Liquid crystal display device with touch sensing function and touch sensing method thereof |
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| CN2010100006955A CN101762900B (en) | 2010-01-15 | 2010-01-15 | Liquid crystal display device with touch sensing function and touch sensing method thereof |
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| CN101762900A true CN101762900A (en) | 2010-06-30 |
| CN101762900B CN101762900B (en) | 2011-11-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063217A (en) * | 2010-11-09 | 2011-05-18 | 友达光电股份有限公司 | Sensing device and related display device |
| CN102411449A (en) * | 2011-09-15 | 2012-04-11 | 友达光电股份有限公司 | Touch control display panel |
| CN103645821A (en) * | 2013-09-25 | 2014-03-19 | 友达光电股份有限公司 | Photosensitive pixel circuit of touch module |
| CN109541842A (en) * | 2018-09-07 | 2019-03-29 | 友达光电股份有限公司 | Display panel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI497364B (en) * | 2013-01-11 | 2015-08-21 | Ye Xin Technology Consulting Co Ltd | Touch display device |
-
2010
- 2010-01-15 CN CN2010100006955A patent/CN101762900B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102063217A (en) * | 2010-11-09 | 2011-05-18 | 友达光电股份有限公司 | Sensing device and related display device |
| CN102063217B (en) * | 2010-11-09 | 2013-04-03 | 友达光电股份有限公司 | Sensing device and related display device |
| CN102411449A (en) * | 2011-09-15 | 2012-04-11 | 友达光电股份有限公司 | Touch control display panel |
| CN102411449B (en) * | 2011-09-15 | 2014-03-19 | 友达光电股份有限公司 | Touch control display panel |
| CN103645821A (en) * | 2013-09-25 | 2014-03-19 | 友达光电股份有限公司 | Photosensitive pixel circuit of touch module |
| CN109541842A (en) * | 2018-09-07 | 2019-03-29 | 友达光电股份有限公司 | Display panel |
| CN109541842B (en) * | 2018-09-07 | 2022-03-29 | 友达光电股份有限公司 | Display panel |
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| Publication number | Publication date |
|---|---|
| CN101762900B (en) | 2011-11-16 |
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