CN101900906B - 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
- Publication number
- CN101900906B CN101900906B CN2010102345821A CN201010234582A CN101900906B CN 101900906 B CN101900906 B CN 101900906B CN 2010102345821 A CN2010102345821 A CN 2010102345821A CN 201010234582 A CN201010234582 A CN 201010234582A CN 101900906 B CN101900906 B CN 101900906B
- Authority
- CN
- China
- Prior art keywords
- signal
- electrically connected
- transistor
- liquid crystal
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention relates to a liquid crystal display device with a touch-sensing function. The liquid crystal display device comprises a display panel and a sensing unit integrated on the display panel, wherein the display panel is provided with a scanning line used for transmitting scanning signals and a read-out line used for transmitting read-out signals; the sensing unit resets the sensing voltage according to the low-level voltage of the scanning signals and also increase the sensing voltage according to the high-level voltage of the scanning signals; the addition of the sensing voltage is controlled by the touch event; and the read-out signals are generated by the sensing unit according to the sensing voltage and the high-level voltage of the scanning signals.
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), graphoscope 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 main with resistance-type contact surface plate and capacitor-type touch panel.The resistance-type contact surface plate is with voltage drop location touch position, 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 show because of the pressure drop of line resistance and reduce, causes low touching sensitivity.In addition, so can make from the transmission delay of the capacitance voltage of inductance capacitance 120 to storage capacitors 140 more seriously, thereby reduce the touching reaction velocity because the stray capacitance of sense wire 110 also and then increases.In addition, for pursue external form frivolous with have cheaply for the display device of touch sensing function, be affixed on the contact surface plate 101 of display panel outward and can't meet the demands.
Summary of the invention
Disclose a kind of liquid crystal indicator of tool touch sensing function according to embodiments of the invention, it comprises sweep trace, sensing cell and the sense wire that is used for transmitting sweep signal.Sensing cell is electrically connected on sweep trace, is used for according to sweep signal so that analog readout signal to be provided.Sensing cell comprises the first transistor, first electric capacity, second electric capacity and transistor seconds.The first transistor comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace, and second end is electrically connected on gate terminal.First electric capacity is electrically connected between second end of sweep trace and the first transistor.Second electric capacity comprises first end and second end, and wherein first end is electrically connected on second end of the first transistor, and second end is used for receiving share voltage.Transistor seconds comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace, and gate terminal is electrically connected on second end of the first transistor, and second end is used for exporting analog readout signal.Sense wire is electrically connected on second end of transistor seconds, is used for the transportation simulator read output signal.In the running of sensing cell, the capacitance of second electric capacity is to change with touch event, produces the analog readout signal corresponding to touch event according to this.
The present invention also discloses a kind of touch sensing method, and it comprises: the liquid crystal indicator of tool touch sensing function is provided, and this liquid crystal indicator comprises: sweep trace is used for transmitting sweep signal; Sensing cell is electrically connected on this sweep trace, is used for according to this sweep signal so that first analog readout signal to be provided; This sensing cell comprises: the first transistor; Comprise first end, second end and gate terminal, wherein this first end is electrically connected on this sweep trace, and this second end is electrically connected on this gate terminal; First electric capacity is electrically connected between second end of this sweep trace and this first transistor; Second electric capacity comprises first end and second end, and wherein first end of this second electric capacity is electrically connected on second end of this first transistor, and second end of this second electric capacity is with adopting the reception share voltage; And transistor seconds; Comprise first end, second end and gate terminal; Wherein first end of this transistor seconds is electrically connected on this sweep trace; The gate terminal of this transistor seconds is electrically connected on second end of this first transistor, and second end of this transistor seconds is used for exporting this first analog readout signal; And first sense wire, be electrically connected on second end of this transistor seconds, be used for transmitting this first analog readout signal; Wherein the capacitance of this second electric capacity is to change with a touch event, produces this first analog readout signal corresponding to this touch event according to this; In first period, this sweep signal that the tool low level voltage is provided is to this sweep trace; In this first period, this sensing cell resets to this low level voltage according to this sweep signal with a sensing voltage; In second period, this sweep signal that the tool high level voltage is provided is to this sweep trace; In this second period, draw this sensing voltage more than the high level voltage of this sensing cell according to this sweep signal, wherein the recruitment of this sensing voltage is to be controlled by a touch event; And in this second period, this sensing cell is fed into this first sense wire according to this sweep signal of this sensing voltage and this high level voltage of tool so that this first analog readout signal to be provided.
Description of drawings
Fig. 1 is the structural representation of known contact surface plate device.
Fig. 2 is the first embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 3 is the work coherent signal waveform synoptic diagram of liquid crystal indicator shown in Figure 2, and wherein transverse axis is a time shaft.
Fig. 4 is the second embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 5 is the 3rd embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 6 is the 4th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 7 is the 5th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 8 is the 6th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Fig. 9 is the 7th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Figure 10 is the 8th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.
Figure 11 is the process flow diagram of touch sensing method of the present invention.
[main element label declaration]
Embodiment
Hereinafter is according to liquid crystal indicator and its touch sensing method of tool touch sensing function of the present invention; The special embodiment that lifts cooperates appended graphic elaborating; But the embodiment that is provided not is the scope that contains in order to restriction the present invention, carries out precedence, any execution flow process that is reconfigured by method step and the method flow number of steps is more non-in order to limit it; The method with impartial effect that produces is all the scope that the present invention is contained.
Fig. 2 is the first embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 2, liquid crystal indicator 200 comprises multi-strip scanning line 201, many data lines 202, a plurality of pixel cell 205, many sense wires 220, a plurality of sensing cells 230 and signal processing circuit 250.Each bar sweep trace 201 is used for transmitting corresponding sweep signal.Each bar data line 202 is used for transmitting the corresponding data signal.Each pixel cell 205 comprises pixel transistor Qpx1, liquid crystal capacitance Clc1 and storage capacitors Cst1.Pixel transistor Qpx1 can be thin film transistor (TFT) or field-effect transistor.Pixel transistor Qpx1 comprises first end, second end and gate terminal; Wherein first end is electrically connected on respective data lines 202 to receive the corresponding data signal; Gate terminal is electrically connected on corresponding sweep trace 201 to receive corresponding sweep signal, and second end is electrically connected on liquid crystal capacitance Clc1 and storage capacitors Cst1.Pixel transistor Qpx1 is used for according to the write running of corresponding sweep signal with control corresponding data signal, and pixel cell 205 is with the output corresponding image signals according to the corresponding data signal that is written into.Each bar sense wire 220 is electrically connected on a plurality of corresponding sensing cells 230, is used for transmitting corresponding analog readout signal.
In the embodiment shown in Figure 2, all adjacent sensing cell 230 of each pixel cell 205.In another embodiment, sensing cell 230 is multi-strip scanning line 201 and being provided with at interval, or many data lines 202 and being provided with at interval, that is is not that each pixel cell 205 is all adjacent with sensing cell 230.In like manner, sense wire 220 can be accordingly many data lines 202 and being provided with at interval.Each sensing cell 230 comprises the first transistor 231, first electric capacity 232, second electric capacity 233 and transistor seconds 234.The first transistor 231 can be thin film transistor (TFT) (Thin Film Transistor) or field-effect transistor (Field Effect Transistor) with transistor seconds 234.Hereinafter is according to coupled relation and the circuit operation principles of sensing cell DXn_m so that each element to be described.
The first transistor 231 comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace SLn to receive sweep signal SSn, and second end is electrically connected on gate terminal.First electric capacity 232 comprises first end and second end, and wherein first end is electrically connected on sweep trace SLn, and second end is electrically connected on second end of the first transistor 231.In preferred embodiment, second end of first electric capacity 232 is directly connected in the gate terminal of the first transistor 231, dwindles circuit layout area according to this.Second electric capacity 233 comprises first end and second end, and wherein first end is electrically connected on second end of the first transistor 231, and second end is used for receiving share voltage Vcom.Transistor seconds 234 comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace SLn, and second end is electrically connected on sense wire RLm, and gate terminal is electrically connected on first end of second electric capacity 233 to receive sensing voltage VDn_m.When sweep signal SSn tool low level voltage, the first transistor 231 is in conducting state, according to this sensing voltage VDn_m is reset to low level voltage.When sweep signal SSn switches to high level voltage by low level voltage; The first transistor 231 switches to cut-off state makes sensing voltage VDn_m become suspension joint voltage; Simultaneously can draw sensing voltage VDn_m more than the coupling through first electric capacity 232, by on the sensing voltage VDn_m that draws can formula (1) expression.
In formula (1), C1 is the capacitance of first electric capacity 232, and C2 is the capacitance of second electric capacity 233, and Vgh is the high level voltage of sweep signal SSn, and Vgl is the low level voltage of sweep signal SSn.The capacitance C2 of second electric capacity 233 changes with touch event, control according to this sensing voltage VDn_m by on the recruitment of drawing.In one embodiment, when corresponding to the positions of panels generation touch event of sensing cell DXn_m, the capacitance C2 of second electric capacity 233 can increase, thus reduce sensing voltage VDn_m by on the recruitment of drawing.In the running of sensing cell DXn_m; Sensing voltage VDn_m is used for controlling the conduction and cut-off state of transistor seconds 234; And then the high level voltage of controlling sweep signal SSn is fed into sense wire RLm to set the voltage of analog readout signal Sroa_m; So the effect of sensing voltage VDn_m can't reduce usefulness because of the increase of the line resistance of sense wire RLm, in other words, the touching sensitivity of sensing cell DXn_m can't 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 shown in Figure 2, and wherein transverse axis is a time shaft.In Fig. 3, basipetal signal is respectively sweep signal SSn-1, sweep signal SSn, sensing voltage VDn-1_m and sensing voltage VDn_m.As shown in Figure 3, in period T1, sweep signal SSn-1 and the equal tool low level voltage of sweep signal SSn Vgl are low level voltage Vgl so sensing voltage VDn-1_m and sensing voltage VDn_m all are reset.In period T2, sweep signal SSn-1 switches to high level voltage Vgh by low level voltage Vgl, so sensing cell DXn-1_m can be pulled to the first high voltage Vh1 with sensing voltage VDn-1_m according to the coupling of its first electric capacity 232.In period T3, sweep signal SSn switches to high level voltage Vgh by low level voltage Vgl, so sensing cell DXn_m can be pulled to the first high voltage Vh1 with sensing voltage VDn_m according to the coupling of its first electric capacity 232.In period T4, sweep signal SSn-1 and the equal tool low level voltage of sweep signal SSn Vgl are low level voltage Vgl so sensing voltage VDn-1_m and sensing voltage VDn_m are reset again.
In period T5; Sweep signal SSn switches to high level voltage Vgh by low level voltage Vgl; This moment is owing to first touch event takes place the positions of panels corresponding to sensing cell DXn_m; Cause the capacitance of second electric capacity 233 of sensing cell DXn_m to rise; So sensing voltage VDn_m is pulled to the second high voltage Vh2 that is lower than the first high voltage Vh1, and the transistor seconds 234 of sensing cell DXn_m promptly according to the second high voltage Vh2 with output corresponding to the analog readout signal Sroa_m of first touch event, make signal processing circuit 250 can produce touch position signal Spos according to this corresponding to first touch event.In period T6; Sweep signal SSn-1 switches to high level voltage Vgh by low level voltage Vgl; This moment is owing to second touch event takes place the positions of panels corresponding to sensing cell DXn-1_m; Cause the capacitance of second electric capacity 233 of sensing cell DXn-1_m to rise; So sensing voltage VDn-1_m is pulled to the 3rd high voltage Vh3 that is lower than the first high voltage Vh1, and the transistor seconds 234 of sensing cell DXn-1_m promptly according to the 3rd high voltage Vh3 with output corresponding to the analog readout signal Sroa_m of second touch event, make signal processing circuit 250 can produce touch position signal Spos according to this corresponding to second touch event.
Fig. 4 is the second embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 4, 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 switch 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 analog readout 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 analog readout signals to comparer 360 in regular turn.Note that multiplexer shown in Figure 2 270 is digital multiplexer, multiplexer 370 then is the simulation 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 analog readout signal in regular turn; Output terminal is electrically connected on storage unit 380, is used for exporting the digital read output signal that analog readout signal and reference voltage Vref comparison are produced.In another embodiment, the positive input terminal of comparer 360 is electrically connected on multiplexer 370 receiving analog readout 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.All the other functional operations of liquid crystal indicator 300 are to be analogous to liquid crystal indicator 200, repeat no more.
Fig. 5 is the 3rd embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 5, 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 330.The inner structure of sensing cell 330 is to be similar to sensing cell shown in Figure 2 230, and main difference is to be provided with in addition the 3rd transistor 235, is used for according to the output running of sweep signal with the control analog readout signal.The 3rd transistor 235 comprises first end, second end and gate terminal, and wherein first end is electrically connected on second end of transistor seconds 234, and gate terminal is electrically connected on sweep trace 201 to receive sweep signal, and second end is electrically connected on sense wire 220.The 3rd transistor 235 can be thin film transistor (TFT) or field-effect transistor.When sweep signal tool low level voltage, the 3rd transistor 235 is in the output running of cut-off state with the decapacitation analog readout signal, that is this moment, the 3rd transistor 235 was used for auxiliary transistor seconds 234 to stop to export analog readout signal.Perhaps, when sweep signal tool high level voltage, the 3rd transistor 235 is in the output running of conducting state with the activation analog readout signal.All the other functional operations of liquid crystal indicator 400 are to be analogous to liquid crystal indicator 200, repeat no more.
Fig. 6 is the 4th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 6, liquid crystal indicator 500 is similar to liquid crystal indicator shown in Figure 5 400, and main difference is signal processing circuit 250 is replaced into signal processing circuit 350.The inner structure of signal processing circuit 350 and functional operation have been specified in the explanation of liquid crystal indicator 300, repeat no more.
Fig. 7 is the 5th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 7, liquid crystal indicator 600 comprises multi-strip scanning line 601, many data lines 602, many gate lines 603, a plurality of pixel cell 605, many sense wires 620, a plurality of sensing cells 630 and signal processing circuit 250.Each bar sweep trace 601 is used for transmitting corresponding sweep signal.Each bar data line 602 is used for transmitting the corresponding data signal.Each bar gate line 603 is used for transmitting corresponding signal.Please note; The frequency of signal can be identical or be different from the frequency of sweep signal; The high level voltage of signal can be identical or be different from the high level voltage of sweep signal, and the low level voltage of signal can be identical or be different from the low level voltage of sweep signal.Each pixel cell 605 comprises pixel transistor Qpx2, liquid crystal capacitance Clc2 and storage capacitors Cst2.Pixel transistor Qpx2 can be thin film transistor (TFT) or field-effect transistor.Pixel transistor Qpx2 comprises first end, second end and gate terminal; Wherein first end is electrically connected on respective data lines 602 to receive the corresponding data signal; Gate terminal is electrically connected on corresponding gate line 603 to receive corresponding signal, and second end is electrically connected on liquid crystal capacitance Clc2 and storage capacitors Cst2.Pixel transistor Qpx2 is used for according to the write running of corresponding signal with control corresponding data signal, and pixel cell 605 is with the output corresponding image signals according to the corresponding data signal that is written into.Each bar sense wire 620 is electrically connected on a plurality of corresponding sensing cells 630, is used for transmitting corresponding analog readout signal.The inner structure of signal processing circuit 250 and functional operation be specified in liquid crystal indicator 200 explanation in, repeat no more.
In the embodiment shown in fig. 7, all adjacent sensing cell 630 of each pixel cell 605.In another embodiment, sensing cell 630 is many gate lines 603 and being provided with at interval, or many data lines 602 and being provided with at interval, that is are not that each pixel cell 605 is all adjacent with sensing cell 630.In like manner, sweep trace 601 can be accordingly many gate lines 603 and being provided with at interval, and sense wire 620 can be accordingly many data lines 602 and being provided with at interval.Each sensing cell 630 comprises the first transistor 631, first electric capacity 632, second electric capacity 633 and transistor seconds 634.The first transistor 631 can be thin film transistor (TFT) or field-effect transistor with transistor seconds 634.Hereinafter is according to coupled relation and the circuit operation principles of sensing cell DYn_m so that each element to be described.
The first transistor 631 comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace SLn to receive sweep signal SSn, and second end is electrically connected on gate terminal.First electric capacity 632 comprises first end and second end, and wherein first end is electrically connected on sweep trace SLn, and second end is electrically connected on second end of the first transistor 631.In preferred embodiment, second end of first electric capacity 632 is directly connected in the gate terminal of the first transistor 631, dwindles circuit layout area according to this.Second electric capacity 633 comprises first end and second end, and wherein first end is electrically connected on second end of the first transistor 631, and second end is used for receiving share voltage Vcom.Transistor seconds 634 comprises first end, second end and gate terminal, and wherein first end is electrically connected on sweep trace SLn, and second end is electrically connected on sense wire RLm, and gate terminal is electrically connected on first end of second electric capacity 633 to receive sensing voltage VDn_m.The functional operation of the first transistor 631, first electric capacity 632, second electric capacity 633 and transistor seconds 634 is the functional operations that are analogous to the first transistor shown in Figure 2 231, first electric capacity 232, second electric capacity 233 and transistor seconds 234, so the touching sensitivity of sensing cell DYn_m can't reduce because of the increase of the line resistance of sense wire RLm.In addition, owing to sensing cell 630 is integrated in the display panel that comprises pixel cell 605, thus can make the external form of liquid crystal indicator 600 more frivolous, and can reduce its production cost.
Fig. 8 is the 6th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 8, liquid crystal indicator 700 is similar to liquid crystal indicator shown in Figure 7 600, and main difference is signal processing circuit 250 is replaced into signal processing circuit 350.The inner structure of signal processing circuit 350 and functional operation have been specified in the explanation of liquid crystal indicator 300, repeat no more.
Fig. 9 is the 7th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.As shown in Figure 9, liquid crystal indicator 800 is similar to liquid crystal indicator shown in Figure 7 600, and main difference is a plurality of sensing cells 630 are replaced into a plurality of sensing cells 730.The inner structure of sensing cell 730 is to be similar to sensing cell shown in Figure 7 630, and main difference is to be provided with in addition the 3rd transistor 635, is used for according to the output running of sweep signal with the control analog readout signal.The 3rd transistor 635 comprises first end, second end and gate terminal, and wherein first end is electrically connected on second end of transistor seconds 634, and gate terminal is electrically connected on sweep trace 601 to receive sweep signal, and second end is electrically connected on sense wire 620.The 3rd transistor 635 can be thin film transistor (TFT) or field-effect transistor.When sweep signal tool low level voltage, the 3rd transistor 635 is in the output running of cut-off state with the decapacitation analog readout signal, that is this moment, the 3rd transistor 635 was used for auxiliary transistor seconds 634 to stop to export analog readout signal.Perhaps, when sweep signal tool high level voltage, the 3rd transistor 635 is in the output running of conducting state with the activation analog readout signal.All the other functional operations of liquid crystal indicator 800 are to be analogous to liquid crystal indicator 600, repeat no more.
Figure 10 is the 8th embodiment synoptic diagram of the liquid crystal indicator of tool touch sensing function of the present invention.Shown in figure 10, liquid crystal indicator 900 is to be similar to liquid crystal indicator shown in Figure 9 800, and main difference is signal processing circuit 250 is replaced into signal processing circuit 350.The inner structure of signal processing circuit 350 and functional operation have been specified in the explanation of the liquid crystal indicator 300 of Fig. 4, repeat no more.
Figure 11 is the process flow diagram of touch sensing method of the present invention.Flow process 990 shown in Figure 11 is the touch sensing method based on the liquid crystal indicator 200～900 of the invention described above first to the 8th embodiment.Touch sensing method shown in the flow process 990 comprises the following step:
Step S910: in first period, the sweep signal that the tool low level voltage is provided is to sweep trace;
Step S915: in first period, sensing cell resets to low level voltage according to sweep signal with sensing voltage;
Step S920: in second period, the sweep signal that the tool high level voltage is provided is to sweep trace;
Step S925: in second period, draw sensing voltage more than the high level voltage of sensing cell according to sweep signal, wherein the recruitment of sensing voltage is to be controlled by touch event;
Step S930: in second period, sensing cell is fed into sense wire according to the sweep signal of sensing voltage and tool high level voltage so that analog readout signal to be provided;
Step S935: in second period, signal processing circuit converts analog readout signal into digital read output signal;
Step S940: in the 3rd period, signal processing circuit produces the touch position signal according to digital read output signal; And
Step S945: in the 3rd period, signal processing circuit resets to low supply voltage with the voltage of analog readout signal.
In the flow process 990 of above-mentioned touch sensing method; Sensing cell in addition can be in first period according to the output running of the low level voltage of sweep signal with this analog readout signal of decapacitation, and in second period according to the output running of the high level voltage of sweep signal with this analog readout signal of activation.
In sum; In the running of the sensing cell of liquid crystal indicator of the present invention; Sensing voltage is used for the conduction and cut-off state of transistor seconds of sense of control measurement unit; And then control is fed into sense wire setting the voltage of analog readout signal with the high level voltage of sweep signal, so the effect of sensing voltage can't reduce usefulness because of the increase of 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, the sensing cell of liquid crystal indicator of the present invention 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 common knowledge the knowledgeable with the affiliated technical field of the present invention; Do not breaking away 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 appended the claim scope person of defining.
Claims (18)
1. the liquid crystal indicator of a tool touch sensing function, it comprises:
Sweep trace is used for transmitting sweep signal;
Sensing cell is electrically connected on this sweep trace, is used for according to this sweep signal so that first analog readout signal to be provided, and this sensing cell comprises:
The first transistor comprises first end, second end and gate terminal, and wherein this first end is electrically connected on this sweep trace, and this second end is electrically connected on this gate terminal;
First electric capacity is electrically connected between second end of this sweep trace and this first transistor;
Second electric capacity comprises first end and second end, and wherein first end of this second electric capacity is electrically connected on second end of this first transistor, and second end of this second electric capacity is used for receiving share voltage; And
Transistor seconds; Comprise first end, second end and gate terminal; Wherein first end of this transistor seconds is electrically connected on this sweep trace, and the gate terminal of this transistor seconds is electrically connected on second end of this first transistor, and second end of this transistor seconds is used for exporting this first analog readout signal; And
First sense wire is electrically connected on second end of this transistor seconds, is used for transmitting this first analog readout signal;
Wherein the capacitance of this second electric capacity is to change with a touch event, produces this first analog readout signal corresponding to this touch event according to this.
2. liquid crystal indicator according to claim 1, wherein this first transistor and this transistor seconds are thin film transistor (TFT) or field-effect transistor.
3. liquid crystal indicator according to claim 1, wherein this sensing cell also comprises:
The 3rd transistor; Comprise first end, second end and gate terminal; Wherein the 3rd transistorized first end is electrically connected on second end of this transistor seconds, and the 3rd transistorized gate terminal is electrically connected on this sweep trace, and the 3rd transistorized second end is electrically connected on this first sense wire.
4. liquid crystal indicator according to claim 3, wherein the 3rd transistor is thin film transistor (TFT) or field-effect transistor.
5. liquid crystal indicator according to claim 1 also comprises:
The second reading outlet is used for transmitting second analog readout signal;
First switch is electrically connected on this first sense wire, is used for the voltage of this first analog readout signal is reset to low supply voltage;
Second switch is electrically connected on this second reading outlet, is used for the voltage of this second analog readout signal is reset to this low supply voltage;
First comparer is electrically connected on this first sense wire, is used for relatively this first analog readout signal and reference voltage to produce the first digital read output signal; And
Second comparer is electrically connected on this second reading outlet, is used for relatively this second analog readout signal and this reference voltage to produce the second digital read output signal.
6. liquid crystal indicator according to claim 5 also comprises:
Multiplexer is electrically connected on this first comparer and this second comparer, is used for exporting in regular turn this first digital read output signal and this second digital read output signal;
Storage unit is electrically connected on this multiplexer, is used for storing this first digital read output signal and this second digital read output signal that this multiplexer is exported in regular turn; And
The signal framing unit is electrically connected on this storage unit, is used for producing the touch position signal according to this first digital read output signal and this second digital read output signal.
7. liquid crystal indicator according to claim 1 also comprises:
The second reading outlet is used for transmitting second analog readout signal;
First switch is electrically connected on this first sense wire, is used for the voltage of this first analog readout signal is reset to low supply voltage;
Second switch is electrically connected on this second reading outlet, is used for the voltage of this second analog readout signal is reset to this low supply voltage;
Multiplexer is electrically connected on this first sense wire and this second reading outlet, is used for exporting in regular turn this first analog readout signal and this second analog readout signal; And
Comparer is electrically connected on this multiplexer, is used for relatively this first analog readout signal and reference voltage producing the first digital read output signal, and is used for relatively this second analog readout signal and this reference voltage to produce the second digital read output signal.
8. liquid crystal indicator according to claim 7 also comprises:
Storage unit is electrically connected on this comparer, is used for storing this first digital read output signal and this second digital read output signal that this comparer produces in regular turn; And
The signal framing unit is electrically connected on this storage unit, is used for producing the touch position signal according to this first digital read output signal and this second digital read output signal.
9. liquid crystal indicator according to claim 1 also comprises:
Data line is used for transmission of data signals; And
Pixel cell is electrically connected on this sweep trace and this data line, is used for according to this sweep signal and this data-signal with output image signal.
10. liquid crystal indicator according to claim 9, wherein this pixel cell comprises:
Pixel transistor comprises first end, second end and gate terminal, and wherein first end of this pixel transistor is electrically connected on this data line to receive this data-signal, and the gate terminal of this pixel transistor is electrically connected on this sweep trace to receive this sweep signal;
Liquid crystal capacitance is electrically connected on second end of this pixel transistor; And
Storage capacitors is electrically connected on second end of this pixel transistor.
11. liquid crystal indicator according to claim 1 also comprises:
Gate line is used for transmitting signal;
Data line is used for transmission of data signals; And
Pixel cell is electrically connected on this gate line and this data line, is used for according to this signal and this data-signal with output image signal.
12. liquid crystal indicator according to claim 11, wherein this pixel cell comprises:
Pixel transistor comprises first end, second end and gate terminal, and wherein first end of this pixel transistor is electrically connected on this data line to receive this data-signal, and the gate terminal of this pixel transistor is electrically connected on this gate line to receive this signal;
Liquid crystal capacitance is electrically connected on second end of this pixel transistor; And
Storage capacitors is electrically connected on second end of this pixel transistor.
13. liquid crystal indicator according to claim 11, wherein the frequency of this signal is the frequency that differs from this sweep signal.
14. liquid crystal indicator according to claim 11, wherein the high level voltage of this signal is the high level voltage that differs from this sweep signal.
15. liquid crystal indicator according to claim 11, wherein the low level voltage of this signal is the low level voltage that differs from this sweep signal.
16. a touch sensing method, it comprises:
The liquid crystal indicator of tool touch sensing function is provided, and this liquid crystal indicator comprises: sweep trace is used for transmitting sweep signal; Sensing cell is electrically connected on this sweep trace, is used for according to this sweep signal so that first analog readout signal to be provided; This sensing cell comprises: the first transistor; Comprise first end, second end and gate terminal, wherein this first end is electrically connected on this sweep trace, and this second end is electrically connected on this gate terminal; First electric capacity is electrically connected between second end of this sweep trace and this first transistor; Second electric capacity comprises first end and second end, and wherein first end of this second electric capacity is electrically connected on second end of this first transistor, and second end of this second electric capacity is used for receiving share voltage; And transistor seconds; Comprise first end, second end and gate terminal; Wherein first end of this transistor seconds is electrically connected on this sweep trace; The gate terminal of this transistor seconds is electrically connected on second end of this first transistor, and second end of this transistor seconds is used for exporting this first analog readout signal; And first sense wire, be electrically connected on second end of this transistor seconds, be used for transmitting this first analog readout signal; Wherein the capacitance of this second electric capacity is to change with a touch event, produces this first analog readout signal corresponding to this touch event according to this;
In first period, this sweep signal that the tool low level voltage is provided is to this sweep trace;
In this first period, this sensing cell resets to this low level voltage according to this sweep signal with a sensing voltage;
In second period, this sweep signal that the tool high level voltage is provided is to this sweep trace;
In this second period, draw this sensing voltage more than the high level voltage of this sensing cell according to this sweep signal, wherein the recruitment of this sensing voltage is to be controlled by a touch event; And
In this second period, this sensing cell is fed into this first sense wire according to this sweep signal of this sensing voltage and this high level voltage of tool so that this first analog readout signal to be provided.
17. touch sensing method according to claim 16, wherein this liquid crystal indicator also comprises signal processing circuit, and this touch sensing method also comprises:
In this second period, this signal processing circuit converts this analog readout signal into digital read output signal;
In the 3rd period, this signal processing circuit produces the touch position signal according to this numeral read output signal; And
In the 3rd period, this signal processing circuit resets to low supply voltage with the voltage of this analog readout signal.
18. touch sensing method according to claim 16 also comprises:
In this first period, this sensing cell is according to the output running with this analog readout signal of decapacitation of the low level voltage of this sweep signal; And
In this second period, this sensing cell is according to the output running with this analog readout signal of activation of the high level voltage of this sweep signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102345821A CN101900906B (en) | 2010-07-20 | 2010-07-20 | Liquid crystal display device with touch-sensing function and touch-sensing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102345821A CN101900906B (en) | 2010-07-20 | 2010-07-20 | Liquid crystal display device with touch-sensing function and touch-sensing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101900906A CN101900906A (en) | 2010-12-01 |
| CN101900906B true CN101900906B (en) | 2012-03-21 |
Family
ID=43226563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102345821A Expired - Fee Related CN101900906B (en) | 2010-07-20 | 2010-07-20 | Liquid crystal display device with touch-sensing function and touch-sensing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101900906B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101255283B1 (en) * | 2009-09-29 | 2013-04-15 | 엘지디스플레이 주식회사 | Liquid Crystal Display Device |
| TWI407405B (en) * | 2010-12-10 | 2013-09-01 | Au Optronics Corp | Liquid crystal display having touch sensing functionality and touch sensing method thereof |
| CN110489002B (en) * | 2018-05-15 | 2023-03-24 | 元太科技工业股份有限公司 | Driver device |
| CN110489021B (en) * | 2018-05-15 | 2023-03-24 | 元太科技工业股份有限公司 | Touch sensor, electronic paper display panel and electronic paper display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101276252A (en) * | 2008-05-21 | 2008-10-01 | 友达光电股份有限公司 | Touch control type panel and portable electronic device with the same |
| CN101598862A (en) * | 2008-06-06 | 2009-12-09 | 群康科技(深圳)有限公司 | Touch control liquid crystal display device and manufacture method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090109359A1 (en) * | 2007-10-30 | 2009-04-30 | Po-Sheng Shih | Display device and related positioning method |
| KR101320500B1 (en) * | 2008-11-20 | 2013-10-22 | 엘지디스플레이 주식회사 | Touch type electrophoretic display device |
-
2010
- 2010-07-20 CN CN2010102345821A patent/CN101900906B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101276252A (en) * | 2008-05-21 | 2008-10-01 | 友达光电股份有限公司 | Touch control type panel and portable electronic device with the same |
| CN101598862A (en) * | 2008-06-06 | 2009-12-09 | 群康科技(深圳)有限公司 | Touch control liquid crystal display device and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101900906A (en) | 2010-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102062966B (en) | liquid crystal display device with touch sensing function and touch sensing method thereof | |
| CN102750062B (en) | A kind of capacitance type in-cell touch panel and display device | |
| CN103514847A (en) | Liquid crystal display device and driving method thereof | |
| CN101726890B (en) | Embedded capacitive induction input display device | |
| CN105824143B (en) | Liquid crystal display device | |
| CN106328074B (en) | Image display system and gate driving circuit | |
| CN203760057U (en) | Shift register unit, grid electrode driving circuit and display device | |
| CN105513522B (en) | Shift register and its driving method, drive circuit and display device | |
| CN101430628B (en) | Touch control type panel and its control method | |
| CN102270070B (en) | Light sensing device suitable for optical touch display panel | |
| CN103400601A (en) | Shift register circuit | |
| CN103943083A (en) | Gate drive circuit and method and display device | |
| CN104200768A (en) | Array substrate, driving method and display device | |
| CN103680636A (en) | Shifting register unit, gate driving circuit and display device | |
| CN101900906B (en) | Liquid crystal display device with touch-sensing function and touch-sensing method thereof | |
| CN106951123A (en) | Touch-control driver element and its driving method, touch drive circuit, display device | |
| CN104679365A (en) | Touch sensing system | |
| CN104699368A (en) | Display device and method of driving the same | |
| CN103677420B (en) | Touch control unit, array base palte, display device and method of toch control | |
| CN105404429A (en) | Touch control circuit and touch control display device | |
| CN101762900B (en) | Liquid crystal display device with touch sensing function and touch sensing method thereof | |
| TWI435244B (en) | Liquid crystal display having touch sensing functionality and touch sensing method thereof | |
| CN201622819U (en) | Driving device for touch control FPD | |
| CN102778982B (en) | Active touch sensing circuit device | |
| CN104991677A (en) | Touch liquid crystal display panel and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120321 Termination date: 20200720 |