CN103713433A - Thin film transistor touch display panel device and driving method thereof - Google Patents
Thin film transistor touch display panel device and driving method thereof Download PDFInfo
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- CN103713433A CN103713433A CN201210376042.6A CN201210376042A CN103713433A CN 103713433 A CN103713433 A CN 103713433A CN 201210376042 A CN201210376042 A CN 201210376042A CN 103713433 A CN103713433 A CN 103713433A
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Abstract
The invention provides a thin film transistor touch display panel device and a driving method thereof. Multiple transmission lines are distributed along a first direction, multiple receiving lines are distributed along a second direction, each of multiple thin film transistors is positioned at a junction of one transmission line and the corresponding receiving line and connected to the corresponding transmission line, the receiving line and a power source, and generates a back passage current when a position corresponding to the thin film transistor is touched, a control unit is connected to the transmission lines to sequentially provide a control signal to the same respectively, and a current sensing unit is connected to the receiving lines to sequentially sense currents generated by the thin film transistors at a sensing time point respectively.
Description
Technical field
The invention relates to the technical field of contact panel, especially refer to a kind of thin film transistor (TFT) touch-control display panel device and driving method thereof.
Background technology
Known external hanging touch panel is formed by three layers of above glass combination such as liquid crystal display panel of thin film transistor (TFT LCD), touch sensing glass (Touch Sensor Glass), this kind of more known display panels of design is thick and heavy, does not meet the light-weighted demand of product.
Simultaneously, display panels, when adding the design of touch sensing (Touch Sensor), if use transparency conducting layer as touch-control electrode, can cause the penetrance of display panels to decline, if use opaque conductive layer, can cause the aperture opening ratio of display panels to reduce.
Summary of the invention
The object of the present invention is to provide a kind of thin film transistor (TFT) touch-control display panel device and driving method thereof, to improve the defect existing in known technology.
For achieving the above object, thin film transistor (TFT) touch-control display panel device provided by the invention, comprises:
Most transmission lines, distribute along first direction;
Most bars receive line, along second direction, distribute, and this first direction is roughly vertical with second direction;
A most thin film transistor (TFT), each this thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, wherein, each this thin film transistor (TFT) is connected to corresponding this transmission line, this reception line and a power supply, with when there is touch-control this thin film transistor (TFT) corresponding position, this thin film transistor (TFT) produces a back of the body channel current;
One control module, is connected to this majority transmission lines, sequentially to provide respectively, controls signal to this majority transmission lines; And
One electric current sensing unit, is connected to this majority bar and receives line, with sequentially respond to this those thin film transistor (TFT) respectively and produced in a sensitive time this by channel current.
Described thin film transistor (TFT) touch-control display panel device, wherein, this control signal is one to have the signal of floating potential.
Described thin film transistor (TFT) touch-control display panel device, wherein, comprises:
Most show picture element, each shows that picture element is corresponding to a thin film transistor (TFT), each this demonstration picture element comprises a grid scanning linear, a data line, a switching transistor and a storage capacitors, and this reception line that this thin film transistor (TFT) is corresponding is the same line with the corresponding data line of this demonstration picture element.
Described thin film transistor (TFT) touch-control display panel device, wherein, the switching transistor of the demonstration picture element that this each thin film transistor (TFT) is display panel, its power supply is the corresponding storage capacitors that shows picture element.
Described thin film transistor (TFT) touch-control display panel device, wherein, comprise a top glass substrate and a lower glass substrate, this majority thin film transistor (TFT) is arranged between this top glass substrate and lower glass substrate, in this top glass substrate, form an ITO layer, this ITO layer is in to offering respectively borehole in most thin film transistor (TFT)s places.
The driving method of thin film transistor (TFT) touch-control display panel device provided by the invention, wherein, this thin film transistor (TFT) touch-control display panel device comprises and is mutually most transmission lines of substantially vertical distribution and most bar receives line, most thin film transistor (TFT)s, each thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, this thin film transistor (TFT) is connected to corresponding this transmission line, this reception line and a power supply, and the method comprises:
With this power supply, provide a current signal to each this thin film transistor (TFT);
Provide respectively a control signal to this majority transmission lines; And
Via those, receive line and receive respectively in the sensing time electric current that this majority thin film transistor (TFT) produces.
Described method, wherein, this control signal is in this sensing time, to have the signal of a floating potential.
Described method, wherein, this control signal has a set potential signal, and this set potential signal is to transfer floating potential in this sensing time.
Described method, wherein, this control signal has on one and draws current potential signal and a drop-down current potential signal, and this sensitive time is on this, to draw potential region.
Described method, wherein, the switching transistor of the demonstration picture element that this each thin film transistor (TFT) is display panel, its power supply is to showing a storage capacitors of picture element.
Described method, wherein, this control signal is during one of demonstration lines show picture frame, to provide to have that on one, to draw current potential signal and a drop-down current potential signal, this sensing time be before drop-down current potential transfers to and draws current potential.
Described method, wherein, transfers to before drawing current potential on this precharge signal is provided at this drop-down current potential, and this sensing time is between this precharge signal region.
Described method, wherein, on this, drawing current potential is the high grid voltage of thin film transistor (TFT).
Described method, wherein, this thin film transistor (TFT) touch-control display panel device comprises a driver element, when this controls signal output floating potential to this thin film transistor (TFT), this driver element output one first current potential signal is to this corresponding reception line, and wherein this first current potential signal is a blank time signal.
Described method, wherein, the voltage of this first current potential signal is for fixing.
Described method, wherein, this control signal is sequentially at N-1 and N, to show during one of lines show picture frame, to provide to have on one, to draw current potential signal and a drop-down current potential signal, this sensing time be N show the drop-down current potential of lines transfer to draw current potential before and at N-1, show and on lines, draw after current potential transfers drop-down current potential to, central N is greater than 2 natural number.
Described method, wherein, this control signal be sequentially N-1 and N show lines to the N+i show during one of lines show picture frame, provide have on one, draw current potential signal and a drop-down current potential signal, this sensing time be N show lines to the N+i show the drop-down current potential of lines transfer to draw current potential before and on N-1 demonstration lines, draw after current potential transfers drop-down current potential to.
Effect of the present invention is:
1) thin film transistor (TFT) touch-control display panel device provided by the invention and driving method thereof, effectively to improve the accuracy of detected position of touch.
2) thin film transistor (TFT) touch-control display panel device provided by the invention and driving method thereof, can utilize the thin film transistor (TFT) on known display panels to carry out touch sensing, and can not increase the hardware cost of known display panels.
3) thin film transistor (TFT) touch-control display panel device provided by the invention and driving method thereof, can solve in known technology, touch resolution cannot be too high problem.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of thin film transistor (TFT) touch-control display panel of the present invention device.
Fig. 2 A is the running schematic diagram of the present invention's one thin film transistor (TFT).
Fig. 2 B is the structural representation of the present invention's one thin film transistor (TFT).
Fig. 3 is the use schematic diagram of the present invention's one thin film transistor (TFT).
Fig. 4 is the schematic diagram of an embodiment of thin film transistor (TFT) of the present invention.
Fig. 5 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.
Fig. 6 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.
Fig. 7 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.
Fig. 8 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.
Fig. 9 is the structural representation of the another thin film transistor (TFT) of the present invention.
Figure 10 is the process flow diagram of the driving method of a kind of thin film transistor (TFT) touch-control display panel of the present invention device.
Primary clustering symbol explanation in accompanying drawing:
Thin film transistor (TFT) touch-control display panel device 300; Transmission line 310; Receive line 320; A most thin film transistor (TFT) 330; Control module 340; Electric current sensing unit 350; Top glass substrate 41; Lower glass substrate 42; ITO layer 45; Borehole 46; Show picture element 710; Grid scanning linear 711; Data line 712; Switching transistor 713; Storage capacitors 714; Storage capacitors 810; Step (A)～(C).
Embodiment
According to a characteristic of the present invention, the present invention proposes a kind of thin film transistor (TFT) touch-control display panel device, comprises most transmission lines (control line), most bar reception line (sensor line), most thin film transistor (TFT)s, a control module and electric current sensing units.This majority transmission lines is to distribute along first direction.It is to distribute along second direction that this majority bar receives line, and this first direction is roughly vertical with second direction.Each this thin film transistor (TFT) of this majority thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, wherein, each this thin film transistor (TFT) is connected to corresponding transmission line, this reception line and a power supply, with when there is touch-control this thin film transistor (TFT) corresponding position, this thin film transistor (TFT) produces a back of the body channel current.This control module is connected to this majority transmission lines, to provide respectively, controls signal to this majority transmission lines.This electric current sensing unit is connected to this majority bar and receives line, with sequentially in the sensitive time respond to respectively this majority thin film transistor (TFT) in produced this by channel current.
According to another characteristic of the present invention, the present invention proposes a kind of driving method of thin film transistor (TFT) touch-control display panel device, wherein this thin film transistor (TFT) touch-control display panel device comprises and is mutually most transmission lines of substantially vertical distribution and most bar receives line, most thin film transistor (TFT)s, each thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, this thin film transistor (TFT) is connected to corresponding this transmission line, this reception line and a power supply, and the method first provides an electric current electric signal to each this thin film transistor (TFT) with this power supply; Provide respectively again a control signal to this majority transmission lines; Finally by receiving line by those, in the sensing time, receive respectively the electric current that this majority thin film transistor (TFT) produces.
Below in conjunction with accompanying drawing, the present invention is elaborated.
Fig. 1 is the schematic diagram of a kind of thin film transistor (TFT) touch-control display panel of the present invention device 300, and this thin film transistor (TFT) touch-control display panel device 300 comprises most transmission lines (control line) 310, most bar receives line (sensor line) 320, most individual thin film transistor (TFT) 330, a control module 340 and an electric current sensing unit 350, a driver element (figure does not illustrate).
This majority transmission lines (control line) 310 is along first direction distribution (directions X).
This majority bar receives line (sensor line) 320 and distributes along second direction (Y-direction), and this first direction is roughly vertical with second direction.
Each thin film transistor (TFT) 330 in this majority thin film transistor (TFT) 330 is positioned at the infall 320 that a transmission line (control line) 310 and receives line (sensor line), wherein, this thin film transistor (TFT) has a grid G and is connected to corresponding transmission line (control line) 310,1 first source/drain electrode S/D and is connected to corresponding reception line (sensor line) 320 and 1 second source/drain electrode S/D and is connected to a power supply 331, when there is touch-control grid G corresponding position, this thin film transistor (TFT) 330 conductings and in this first source/drain electrode S/D generation current.Control module 340 is sequentially sent into signal to transmission line 310 and is made thin film transistor (TFT) 330 conductings, because making channel layer, the pressure reduction between power supply 331 and reception line 320 have electric current to produce, when there is touch-control thin film transistor (TFT) 330 corresponding positions, because back of the body passage (back channel) effect produces a back of the body channel current, the curent change of the channel layer that makes to flow through.Wherein, this power supply 331 provides a direct current electric signal or an alternating current signal.Direct current signal can be a fixed voltage, for example 5V or 0V.
This control module 340 is connected to this majority transmission lines (control line) 310, sequentially to provide respectively, controls signal to this majority transmission lines (control line).
This electric current sensing unit 350 is connected to this majority bar and receives line (sensor line) 320, sequentially to respond to respectively in the sensitive time electric current that this majority thin film transistor (TFT) 330 is produced in this first source/drain electrode S/D.
Fig. 2 A is the running schematic diagram of the present invention's one thin film transistor (TFT) 330, and Fig. 2 B is the structural representation of the present invention's one thin film transistor (TFT) 330, and it shows that thin film transistor (TFT) 330 of the present invention is arranged between a top glass substrate 41 and lower glass substrate 42.And as shown in Figure 2 A, this power supply 33 1 is fixed voltage 0V.When transmission line 310 is admitted to signal and makes thin film transistor (TFT) conducting, power supply 331 and the pressure reduction receiving between line 320 make channel layer have electric current to produce, when there is touch-control thin film transistor (TFT) corresponding position, because backchannel effect make the to flow through electric current of channel layer changes, this electric current sensing unit 350 is via corresponding reception line (sensor line) 320 these electric currents of induction, and this control module 340 also can have been judged whether that by the size of this electric current finger is near this thin film transistor (TFT) 330.
The difference of electric current is to be in when subcritical district (sub-thresholdregion) because of this thin film transistor (TFT) 330, because flowing through drain electrode and the electric current I d of source electrode, to be subject to the impact of grid potential very serious, therefore when finger touches, can cause the obvious difference of electric current I d, the present invention utilizes this phenomenon to judge touchless.That is finger touching is to should thin film transistor (TFT) 330 position time, the effect via back of the body passage (Back channel), changes the threshold voltage (Vt) of this thin film transistor (TFT) 330, thereby causes the difference of the electric current I d that flows through drain electrode and source electrode.
Fig. 3 is the use schematic diagram of the present invention's one thin film transistor (TFT) 330.This control module 340 provides controls signal to transmission lines (control line) 310.Wherein, this control signal has a set potential signal, and this set potential signal is to transfer floating potential in this sensing time.That is in the sensing time, this control signal is one to have the signal of floating potential (floating).
As shown in Figure 3, in the situation 1 of the online signal of transmission, this signal with floating potential is a set potential V1 and periodically when set potential V1, transfers floating potential to; Or in the situation 2 of the online signal of transmission, this signal with floating potential be drop-down current potential V1 and periodically on being pulled up to, draw current potential V2 after transfer floating potential to; Or in the situation 3 of the online signal of transmission, this signal with floating potential be drop-down current potential V1 and periodically on being pulled up to, draw current potential V2 after be fixed on and draw current potential V2, then be pulled low to drop-down current potential V1.For example, this drop-down current potential V1 is-7V that on this, drawing current potential V2 is 0V.
As shown in Figure 3, in the sensing time, in receiving the situation 1 of the upper signal of line (sensor line), reception line is floating potential (floating); Or in receiving the situation 2 of the upper signal of line (sensor line), reception line is set potential.
Transmission line (control line) 310 can connect single or plurality of films transistor 330.This power supply 331 is a signal source, comprises direct current or AC signal.
Fig. 4 is the schematic diagram of an embodiment of thin film transistor (TFT) of the present invention.As shown in Figure 4, one of thin film transistor (TFT) 330 and a display panel shows that the switching transistor 713 of picture element 710 coexists, and its power supply is the corresponding storage capacitors 714 that shows picture element.This demonstration picture element 710 is comprised of grid scanning linear 711, data line 712, switching transistor 713 and storage capacitors 714, and it is general liquid crystal display picture element 710, repeats no more.Wherein, in the present embodiment, this receives line (sensor line) 320 is the same line with the data line 712 of liquid crystal display picture element 710.
As shown in Figure 4, when time T 1, be that the image that carries out picture frame n-1 shows, when time T 2, be to carry out touch sensing.Therefore in time T 1, when wish shows a certain display line, corresponding grid scanning linear 711 can be pulled up on one and be drawn current potential signal V3 by drop-down current potential V1, display pixel data are write to corresponding storage capacitors 714 (charging) by data line 712.Afterwards, corresponding grid scanning linear 711 draws current potential signal V3 to draw and is down to drop-down current potential V1, with the storage capacitors 714 by corresponding, keeps the display pixel data (maintenance) that write from above.For example, above drawing current potential signal V3 is Vgh.Wherein, on this, drawing current potential V3 is the high grid voltage (Vgh) of thin film transistor (TFT), and Vgh is set between 15V～33V in current product.
As shown in Figure 4, this control signal has on one and draws current potential signal and a drop-down current potential signal, and this sensitive time is on this, to draw potential region.That is between picture frame n-1 and picture frame n, (T2) is blank time (blanking) of demonstration for some time, touch sensing is carried out in utilization of the present invention during this period of time.It is one to have the signal of floating potential (floating) that this control module 340 provides to the control signal of this majority transmission lines 310.When time T 2, the signal that this on this transmission line 310 has a floating potential is for transferring floating potential (floating) to and transfer drop-down current potential V1 to during for drop-down current potential V1, at drop-down current potential V1 in (time T 2 of picture frame n-1) during a demonstration picture frame.Or this signal with floating potential in (time T 2 of picture frame n-1) during a demonstration picture frame for drop-down current potential V1, be pulled up to and draw current potential V2, transfer to during above transferring floating potential (floating) to while drawing current potential V2, at floating potential and draw current potential V2 and return to drop-down current potential V1.
In this embodiment, blank (data blanking) time of data while utilizing picture frame to show is carried out touch sensing.In this embodiment, can in touch sensing in the time, start plurality of transmission lines 310 (for example 5) simultaneously, to coordinate electric current sensing unit detecting current size requirement, not affect display frame.
Fig. 5 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.As shown in Figure 5, the switching transistor of the demonstration picture element that this each thin film transistor (TFT) 330 is display panel, its power supply is the corresponding storage capacitors 810 that shows picture element.This reception line (sensor line) 320 is the same line with the data line of liquid crystal display picture element.This transmission line (control line) the 310th, with the grid scanning linear of liquid crystal display picture element be the same line.
As shown in Figure 5, when time T 1, be that the image that carries out line k-1 shows, when time T 2, be to carry out touch sensing.Between online k-1 and line k, (T2) is blank time (blanking) of demonstration for some time, and touch sensing is carried out in utilization of the present invention during this period of time.
It is one to have the signal of floating potential (floating) that this control module 340 provides to the control signal of this majority transmission lines 310.This signal with floating potential for (time T 1 of line k-1) during demonstration lines on draw signal V3, display pixel data are write to corresponding storage capacitors 810 (charging) by reception line (sensor line) 320.Afterwards, corresponding transmission line (control line) 310 draws signal V3 to draw and is down to drop-down signal V2 from above, with the storage capacitors 810 by corresponding, keep the display pixel data that write, maintain drop-down signal V2 (maintenance), transfer floating potential (floating) when (time T 2 of line k-1) is by drop-down signal V2 during these demonstration lines to.
Or this signal with floating potential for (time T 1 of line k-1) during a demonstration picture frame on draw signal V3, so that storage capacitors is charged, with display pixel.Then, signal is pulled low to drop-down signal V2, maintains the display pixel data (maintenance) of drop-down signal V2 to keep writing.When time T 2, signal be pulled up to precharge signal V1 and when precharge signal V1, transfer floating potential (floating) to, then when switching to next and show picture frame, this floating potential transfers precharge signal V1 to and is pulled up to and draws signal V3.Wherein, on this, drawing signal V3 is the high grid voltage (Vgh) of thin film transistor (TFT).
As shown in Figure 5, when time T 1, output potential signal Vp (+) is to corresponding reception line (sensor line) for one driver element (figure does not illustrate), and this current potential signal Vp (+) is the corresponding voltage of the pixel data of respective pixel in last picture frame.When time T 2, this signal with floating potential is when floating potential, this control module 340 output the first current potential signal Vdata_blank are to corresponding reception line (sensorline), and wherein this first current potential signal is a blank time (Vdata_blank) signal
Wherein, current potential signal Vp (+) with the pass of the first current potential signal Vdata_blank is:
Vp(+)-Vdata_blan?k＝Vds，
In the middle of, Vds is a default voltage.
The present invention first measures thin film transistor (TFT) 330 under different source electrodes and drain voltage (Vds), when finger has touchless thin film transistor (TFT) 330, when flowing through the electric current I d difference maximum of drain electrode and source electrode, corresponding source electrode and drain voltage (Vds) are recorded, usingd as this default voltage Vds.As shown in Figure 5, when wanting when n picture frame k bar line carries out touch sensing, the voltage of the display pixel data of the k bar line of the storage capacitors 810 previous picture frames of maintenance (n-1 picture frame), be current potential signal Vp (+), now in time T 2, one driver element is exported the first current potential signal Vdata_blank to corresponding reception line (sensor line) 320, therefore the source electrode of thin film transistor (TFT) 330 and the voltage of drain electrode are this default voltage Vds, therefore, when having or not finger touches, the difference that flows through the source electrode of thin film transistor (TFT) 330 and the electric current of drain electrode can be maximum.Can make this electric current sensing unit 350 easily judge whether finger touches.
Fig. 6 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention.It is from Fig. 5 Main Differences: the present invention first measures thin film transistor (TFT) 330 and clamps under Vt in different runnings, when finger has touchless thin film transistor (TFT) 330, flows through the data of the electric current I d of drain electrode and source electrode, and is made into the form that running clamps Vt and electric current.
When wanting when n picture frame k bar line carries out touch sensing, the voltage of the display pixel data of the k bar line of the storage capacitors 810 previous picture frames of maintenance (n-1 picture frame), be current potential signal Vp (+), now in time T 2, this driver element IC exports the first current potential signal Vs to corresponding reception line (sensorline) 320, therefore the source electrode of thin film transistor (TFT) 330 and the voltage of drain electrode are this running cramping Vt, wherein, the voltage of this first current potential signal Vs is fixing.Therefore,, when time T 2, current potential signal Vp (+) with the pass of the first current potential signal Vs is:
Vp(+)-Vs＝Vt。
When having or not finger touches, after this electric current sensing unit 350 induction current Id, by electric current I d and running, clamp Vt, this control module 340 can, by form, judge whether finger touches.
Fig. 7 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention, this control signal sequentially shows during one of lines show picture frame, to provide to have at N-1 and N and on one, draws current potential signal and a drop-down current potential signal, this sensing time be N show the drop-down current potential of lines transfer to draw current potential before and at N-1, show and on lines, draw after current potential transfers drop-down current potential to, central N is greater than 2 natural number.As shown in Figure 7, when time T dc, corresponding to N-2, show that this signal with floating potential of lines draws signal V3 on during a N-2 shows lines being, to storage capacitors charging, with display pixel, and when time T tc, is pulled low to drop-down signal V2.Now, N-2 is shown the storage capacitors charging of a pixel of lines.Central N is an index value, and it is to be greater than 2 natural number.
When time T tc, it is drop-down signal V2 that this that shows lines corresponding to N-2 has floating potential, shows that this signal with floating potential of lines is pulled up to draw signal V3 corresponding to N.That is between online N-2 and line N-1, (Ttc) is blank time (blanking) of demonstration for some time, utilization of the present invention is carried out default voltage Vd via reception line (sensor line) 320 during this period of time and is write, this storage capacitors is charged to this voltage Vd.This storage capacitors shows the thin film transistor (TFT) 330 on lines corresponding to N.That is, N-2 is shown the storage capacitors charging of a pixel of lines when time T dc, to carry out image demonstration, N is shown the storage capacitors charging of a pixel of lines when time T tc, to prepare to carry out touch sensing.
When time T a, corresponding to N-1, show that this signal with floating potential of lines draws signal V3 on during a N-1 shows lines being, N-1 is shown to the storage capacitors charging of a pixel of lines, to carry out image demonstration, when time T s, be pulled low to drop-down signal V2.When time T s, when this that shows lines corresponding to N-1 has floating potential and be drop-down signal V2, corresponding to N, show that this signal with floating potential of lines transfers floating potential to, to carry out touch sensing.When time T s, carry out touch sensing, now receiving line (sensor line) 320 set potentials is the first current potential signal Vs, and the grid that simultaneously maintains thin film transistor (TFT) 330 is floating potential (floating).
When time T dc2, the signal that this that shows lines corresponding to N has a floating potential on draw signal V3, N is shown to the storage capacitors charging of lines, to show the pixel of N demonstration lines.Now repeating abovementioned steps, therefore repeat no more.Need it should be noted that after time T tc and between time Tdc2, due to N, show that the storage capacitors of lines is defaulted as this voltage Vd, therefore and cannot correctly show that N shows the image of lines.Yet compole is short in the time of this section, user's eyes also cannot be discovered, therefore generally speaking, user still can correctly watch the shown image of LCD screen.After time T dc2, N shows that lines can correctly show again that N shows the image of lines.
Fig. 8 is the schematic diagram of the another embodiment of thin film transistor (TFT) of the present invention, this control signal be sequentially N-1 and N show lines to the N+i show during one of lines show picture frame, provide have on one, draw current potential signal and a drop-down current potential signal, this sensing time be N show lines to the N+i show the drop-down current potential of lines transfer to draw current potential before and on N-1 demonstration lines, draw after current potential transfers drop-down current potential to.As shown in Figure 8, when time T dc, corresponding to N-2, show that this signal with floating potential of lines draws current potential V3 on during a N-2 shows lines being, with to storage capacitors charging, with display pixel, and when time T tc, is pulled low to drop-down current potential V2.Now, N-2 is shown the storage capacitors charging of a pixel of lines.
When time T tc, when this that shows lines corresponding to N-2 has floating potential and be drop-down current potential V2, corresponding to N, show that lines to the N+i shows that this signal with floating potential of lines is pulled up to and draws current potential V3.That is between online N-2 and line N-1, (Ttc) is blank time (blanking) of demonstration for some time, utilization of the present invention is carried out default voltage Vd via reception line (sensor line) 320 during this period of time and is write, this storage capacitors is charged to this voltage Vd.This storage capacitors is to show that corresponding to N lines to the N+i shows the thin film transistor (TFT) 330 on lines.Central i is an index value, and it is to be greater than 1 natural number.That is, N-2 is shown the storage capacitors charging of a pixel of lines when time T dc, to carry out image demonstration, when time T tc, N is shown to lines to the N+i shows the storage capacitors charging of a pixel of lines, to prepare to carry out touch sensing.
When time T ta, corresponding to N-1, show that this signal with floating potential of lines draws current potential V3 on during a N-1 shows lines being, N-1 is shown to the storage capacitors charging of a pixel of lines, to carry out image demonstration, when time T s, be pulled low to drop-down current potential V2.When time T s, when this that shows lines corresponding to N-1 has floating potential and be drop-down current potential V2, corresponding to N, show that lines to the N+i shows that this signal with floating potential of lines transfers floating potential to, to carry out touch sensing.When time T s, carry out touch sensing, now receiving line (sensor line) 320 set potentials is the first current potential signal Vs, and the grid that simultaneously maintains thin film transistor (TFT) 330 is floating potential (floating).(Embodiment6-1，original)
The embodiment of Fig. 8 will receive line (sensor line) 320 and extend to i+1 bar, therefore can produce more electric current compared with Fig. 7 when touch sensing.It carries out storage capacitors current potential replacement (or charging to this voltage Vd) when time T tc, when time T s, carries out touch sensing (current sense), when time T dc, completes display signal and writes.
The technology of the present invention applies to rotary-type (the In Panel Switching that lies low; IPS) during panel; as shown in Figure 9; can in this top glass substrate 41, form an ITO layer 45; come protective surface intralamellar part to set up and drive the electric field of liquid crystal not disturbed; therefore this ITO layer 45, in to offering respectively borehole 46 in most thin film transistor (TFT) 330 places, exposes thin film transistor (TFT) 330 of the present invention, carrys out the touching of finger sensing head.In addition, also can for example, in the ITO layer of IPS panel lower glass substrate (: common electrode) offer respectively borehole corresponding to thin film transistor (TFT) 330 places).
Figure 10 is the process flow diagram of the driving method of a kind of thin film transistor (TFT) touch-control display panel of the present invention device, in the lump with reference to the thin film transistor (TFT) touch-control display panel device shown in aforementioned figures, wherein this thin film transistor (TFT) touch-control display panel device comprises most transmission lines 310 and the most bar reception line (sensor line) 320 that is mutually substantially vertical distribution, a most thin film transistor (TFT) 330, each thin film transistor (TFT) 330 is positioned at the infall that a transmission line 310 and receives line (sensor line) 320, this thin film transistor (TFT) 330 has a grid G and is connected to corresponding transmission line, one first source/drain electrode S/D is connected to corresponding reception line (sensor line), and one second source/drain electrode S/D be connected to a power supply 33 1.The method is prior to providing the second source/drain electrode S/D of a current signal to each thin film transistor (TFT) 330 with this power supply 331 in step (A).
In step (B), provide respectively a control signal to this majority transmission lines 310.
In step (C), via those, receive line and receive respectively this majority thin film transistor (TFT) in produced electric current in the sensing time.
From above stated specification, the technology of the present invention can utilize the thin film transistor (TFT) on known display panels to carry out touch sensing, and can not increase the hardware cost of known display panels.The technology of the present invention also can coexist thin film transistor (TFT) 330 and the thin film transistor (TFT) on known display panels, and carries out touch sensing.No matter be whichever, it all can improve the accuracy of detected position of touch effectively.Also can solve in known technology, touch resolution cannot be too high problem.
From the above, the present invention, no matter with regard to object, means and effect, all showing that it is totally different in the feature of known technology, has practical value.Only it should be noted, above-mentioned many embodiment only give an example for convenience of explanation, and the interest field that the present invention advocates should be as the criterion certainly described in the claim scope of application, but not only limits to above-described embodiment.
Claims (17)
1. a thin film transistor (TFT) touch-control display panel device, comprises:
Most transmission lines, distribute along first direction;
Most bars receive line, along second direction, distribute, and this first direction is roughly vertical with second direction;
A most thin film transistor (TFT), each this thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, wherein, each this thin film transistor (TFT) is connected to corresponding this transmission line, this reception line and a power supply, with when there is touch-control this thin film transistor (TFT) corresponding position, this thin film transistor (TFT) produces a back of the body channel current;
One control module, is connected to this majority transmission lines, sequentially to provide respectively, controls signal to this majority transmission lines; And
One electric current sensing unit, is connected to this majority bar and receives line, with sequentially respond to this those thin film transistor (TFT) respectively and produced in a sensitive time this by channel current.
2. thin film transistor (TFT) touch-control display panel device according to claim 1, wherein, this control signal is one to have the signal of floating potential.
3. thin film transistor (TFT) touch-control display panel device according to claim 2, wherein, comprises:
Most show picture element, each shows that picture element is corresponding to a thin film transistor (TFT), each this demonstration picture element comprises a grid scanning linear, a data line, a switching transistor and a storage capacitors, and this reception line that this thin film transistor (TFT) is corresponding is the same line with the corresponding data line of this demonstration picture element.
4. thin film transistor (TFT) touch-control display panel device according to claim 2, wherein, this each thin film transistor (TFT) is display panel a switching transistor that shows picture element, its power supply be the storage capacitors of corresponding demonstration picture element.
5. thin film transistor (TFT) touch-control display panel device according to claim 1, wherein, comprise a top glass substrate and a lower glass substrate, this majority thin film transistor (TFT) is arranged between this top glass substrate and lower glass substrate, in this top glass substrate, form an ITO layer, this ITO layer is in to offering respectively borehole in most thin film transistor (TFT)s places.
6. the driving method of a thin film transistor (TFT) touch-control display panel device, wherein, this thin film transistor (TFT) touch-control display panel device comprises and is mutually most transmission lines of substantially vertical distribution and most bar receives line, most thin film transistor (TFT)s, each thin film transistor (TFT) is positioned at the infall that a transmission line and receives line, this thin film transistor (TFT) is connected to corresponding this transmission line, this reception line and a power supply, and the method comprises:
With this power supply, provide a current signal to each this thin film transistor (TFT);
Provide respectively a control signal to this majority transmission lines; And
Via those, receive line and receive respectively in the sensing time electric current that this majority thin film transistor (TFT) produces.
7. method according to claim 6, wherein, this control signal is in this sensing time, to have the signal of a floating potential.
8. method according to claim 7, wherein, this control signal has a set potential signal, and this set potential signal is to transfer floating potential in this sensing time.
9. method according to claim 7, wherein, this control signal has on one and draws current potential signal and a drop-down current potential signal, and this sensitive time is on this, to draw potential region.
10. method according to claim 7, wherein, this each thin film transistor (TFT) is display panel a switching transistor that shows picture element, its power supply is for to showing a storage capacitors of picture element.
11. methods according to claim 10, wherein, this control signal is during one of demonstration lines show picture frame, to provide to have that on one, to draw current potential signal and a drop-down current potential signal, this sensing time be before drop-down current potential transfers to and draws current potential.
12. methods according to claim 11, wherein, transfer to before drawing current potential on this precharge signal are provided at this drop-down current potential, and this sensing time is between this precharge signal region.
13. methods according to claim 11, wherein, on this, drawing current potential is the high grid voltage of thin film transistor (TFT).
14. methods according to claim 11, wherein, this thin film transistor (TFT) touch-control display panel device comprises a driver element, when this controls signal output floating potential to this thin film transistor (TFT), this driver element output one first current potential signal is to this corresponding reception line, and wherein this first current potential signal is a blank time signal.
15. methods according to claim 14, wherein, the voltage of this first current potential signal is for fixing.
16. methods according to claim 10, wherein, this control signal is sequentially at N-1 and N, to show during one of lines show picture frame, to provide to have on one, to draw current potential signal and a drop-down current potential signal, this sensing time be N show the drop-down current potential of lines transfer to draw current potential before and at N-1, show and on lines, draw after current potential transfers drop-down current potential to, central N is greater than 2 natural number.
17. methods according to claim 10, wherein, this control signal be sequentially N-1 and N show lines to the N+i show during one of lines show picture frame, provide have on one, draw current potential signal and a drop-down current potential signal, this sensing time be N show lines to the N+i show the drop-down current potential of lines transfer to draw current potential before and on N-1 demonstration lines, draw after current potential transfers drop-down current potential to.
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Address after: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Applicant after: Innolux Display Group Address before: 518109 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 1, floor 4, Applicant before: Qunkang Technology (Shenzhen) Co., Ltd. Applicant before: Chimei Optoelectronics Co., Ltd. |
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