CN102707480B - Embedded multipoint touch control liquid crystal display panel system - Google Patents
Embedded multipoint touch control liquid crystal display panel system Download PDFInfo
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- CN102707480B CN102707480B CN201210218175.0A CN201210218175A CN102707480B CN 102707480 B CN102707480 B CN 102707480B CN 201210218175 A CN201210218175 A CN 201210218175A CN 102707480 B CN102707480 B CN 102707480B
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Abstract
The invention provides an embedded multipoint touch control liquid crystal display panel system, which comprises a touch control liquid crystal display panel and a touch control display control subsystem, wherein the touch control liquid crystal display panel is provided with a thin film transistor layer, a sensing electrode layer, a common electrode and touch control driving layer; the thin film transistor layer is provided with K grid drive wires and L source drive wires for performing display operation; the sensing electrode layer is provided with M first conductor wires, and is used for sensing an approaching external object according to a touch control driving signal; the common electrode and touch control driving layer is provided with N second conductor wires, and is used for receiving a common voltage during displaying, and receiving a touch control driving signal during touch control sensing; the K grid drive wires are separated into N groups; each group of grid drive wires corresponds to one of N second conductor wires; and when one group of grid drive wires is provided with a display driving signal, corresponding second conductor wires are connected to a common voltage.
Description
Technical field
The present invention relates to contact panel field, particularly relate to a kind of In-cell multi-touch liquid crystal display panel system.
Background technology
The know-why of contact panel is when finger or other medium contact are to screen, according to different induction mode, and detecting voltage, electric current, sound wave or infrared ray etc., and then measure the coordinate position of touch point.Such as electric resistance touch-control panel is and utilizes upper and lower interelectrode potential difference (PD), detects touch point place in order to calculate compression point position.Capacitance type touch-control panel is the capacitance variations utilizing the electrostatical binding between the transparency electrode of arrangement and human body to produce, and detects its coordinate from produced curtage.
According to capacitance touching control know-why, it can be divided into surface-type capacitance touching control to sense (Surface Capacitive) and these two kinds of technology of projecting type capacitor touch-control sensing (Projected Capacitive).Though surface-type capacitive sensing technology framework simple structure, but not easily realize multi-point touch and more difficultly overcome electromagnetic interference (EMI) (Electromagnetic Disturbance, EMI) and the problem of news of making an uproar, make mostly now to develop towards projected capacitive touch detection technology.
Projecting type capacitor touch-control sensing technology can be divided into again self-induction capacitor type (Self capacitance) and Inductance and Capacitance type (Mutual capacitance).Self-induction capacitor type refers to and produces capacitive coupling between touch control object and conductor lines, and the capacitance variations measuring conductor lines determines that touching occurs, but Inductance and Capacitance type is then when touching occurs, and can produce capacitive coupling phenomenon between contiguous two-layer conductor lines.
Known self-induction electric capacity (self capacitance) detection technology is each strip conductor line ground capacitance (Cs) of sensing, judge whether that object is near capacitance type touch-control panel by the change of ground capacitance value, wherein, self-induction electric capacity or ground capacitance are not entity capacitance, and it is parasitism and the stray capacitance of each strip conductor line.Fig. 1 is the schematic diagram that known self-induction electric capacity (self capacitance) senses, it is in the cycle very first time, first driven the conductor lines of first direction by the driving of first direction and sensor 110, the self-induction electric capacity (Cs) in order to the conductor lines to first direction charges.Again in the second time cycle, to drive and sensor 110 detects the online voltage of the conductor of first direction, in order to obtain m data.Again in the 3rd time cycle, driven the conductor lines of second direction by the driving of second direction and sensor 120, with the self-induction capacitor charging of the conductor lines to second direction.Again in the 4th time cycle, to drive and sensor 120 detects the online voltage of the conductor of second direction, to obtain n data.Therefore, m+n data can altogether be obtained.
Simultaneously known self-induction electric capacity (self capacitance) method for sensing in Fig. 1 is connected with driving circuit and sensing circuit online at same conductor, after first conductor lines being driven, again same conductor lines is sensed to the variable quantity of its signal, to determine self-induction capacitance size.Its benefit is:
(1) data volume is less, and the single image (image) of contact panel only has m+n data, saves hardware cost;
(2) image untreatment datas (image raw data) obtain fast, therefore the time of sensing needed for touch points is less.Because all first direction conductor lines can sense (certainly also can sense one by one) simultaneously, and then the conductor lines all to second direction drives and senses simultaneously, the different directions conductor lines sensor operation of twice just can finish a picture frame, therefore data volume is less, simultaneously also few a lot of in the time that sensing signal is transferred to needed for digital signal by simulating signal by execution; And
(3) amount due to data processing is less, so have lower power consumption.
But the corresponding shortcoming of self-induction electric capacity (self capacitance) method for sensing is then:
(1) when contact panel there being suspension joint conductor (as water droplet, oil stain etc.), touch points is easily caused to judge by accident; And
(2) when contact panel there being multi-point touch simultaneously, have the phenomenon of ghost, cause self-induction electric capacity (self capacitance) method for sensing to be difficult to support the application of multi-point touch.
But, the method that capacitance type touch-control panel drives is sensing mutual induction electric capacity (mutual capacitance, Cm) size variation, in order to have judged whether that object is near contact panel, similarly, mutual induction electric capacity (Cm) is entity capacitance not, and it is mutual induction electric capacity (Cm) between the conductor lines of first direction and the conductor lines of second direction.Fig. 2 is the schematic diagram that known mutual induction electric capacity (Cm) senses, as shown in Figure 2, driver 210 is configured on first direction (Y), sensor 220 is configured in second direction (X), before very first time cycle T 1 during the semiperiod, driven by the conductor lines 230 of driver 210 pairs of first directions, it uses voltage Vy_1 to charge to mutual induction electric capacity (Cm) 250, when the very first time in the 1 later half cycle of cycle T, all the sensors 220 senses the voltage (Vo_1 in the conductor lines 240 of all second directions, Vo_2, ..., Vo_n), to obtain n data, after m drive cycle, m × n data can be obtained.
The advantage of mutual induction electric capacity (Cm) method for sensing is:
(1) the signal different directions of suspension joint conductor and earth conductor, therefore can determine whether that human body is touched very easily; And
(2), owing to there being the true coordinate of each point, when multiple spot touches simultaneously, can tell the actual position of each point, mutual induction electric capacity (Cm) method for sensing easily supports the application of multi-point touch.
Contact panel and flat-panel screens are directly carried out upper and lower coinciding by known touch control type planar display system, because the contact panel coincided is transparent panel, thus the image of flat-panel screens can penetrate coincide contact panel thereon and then show image, and by contact panel as the medium of input or interface.
But this known technology, because in time coinciding, the weight of a contact panel must be increased, flat-panel screens weight is increased significantly, do not meet current market for the compact requirement of display, illustrate further, and directly coincide contact panel and flat-panel screens time, on thickness, add the thickness of contact panel itself, reduce the penetrance of light, increase reflectivity and mist degree, the quality of screen display is had a greatly reduced quality.
For aforesaid shortcoming, touch control type planar display changes adopts embedded type touch control technology.The main at present developing direction of embedded type touch control technology can be divided into On-Cell and In-Cell two kinds of technology.On-Cell technology is that the induction electrode of projected capacitive touch technology (Sensor) is produced on panel color optical filter (Color Filter, CF) the back side (namely attaching Polarizer face), is integrated into the structure of colored filter.In-Cell technology is then insert in the middle of the structure of liquid crystal born of the same parents (LCD Cell) by induction electrode (Sensor), touch control component is integrated in display panel by In Cell technology, display panel is made inherently to possess touch controllable function, therefore do not need the processing procedure carrying out in addition fitting with contact panel or assembling, such technology is all developed by TFT LCD factory usually.In-cell multi-touch panel (In-Cell Multi-Touch Panel) technology is gradually ripe, and touch controllable function is directly integrated in panel procedure for producing, does not need to add one deck touch-control glass again, therefore can maintain the thinness of former panel and then reduce cost.
Fig. 3 A is the configuration diagram of known In-cell multi-touch panel (In-Cell Multi-Touch Panel) 300, is from bottom to top sequentially lower polarizing layer (lower polarizer) 310, lower glass substrate 320, tft layer (TFT or LTPS) 330, liquid crystal layer 340, common electrode and touch-control and drives layer 350, chromatic filter layer (color filter) 360, top glass substrate 370, induction electrode layer 380 and upper polarizing layer (upper polarizer) 390.As shown in Figure 3A, in order to save cost, touch-control sensor is integrated in display panels by it, and the common electrode layer (Vcom) in display panels and the driving in touch-control sensor are shared same layer, to form this common electrode and touch-control driving layer 350, to save cost.380, induction electrode layer is positioned at the top of this top glass substrate 370.This tft layer (TFT or LTPS) 330 is made up of thin film transistor (TFT) or low-temperature polysilicon film transistor (Low-Temperature Poly-Si Thin FilmTransistors, LTPS TFTs) 332 and transparency electrode 331.
Fig. 3 B is another configuration diagram of known In-cell multi-touch panel.The difference of itself and Fig. 3 A is that induction electrode layer 380 is positioned at the below of top glass substrate 370.
Fig. 3 C is the another configuration diagram of known In-cell multi-touch panel.The difference of itself and Fig. 3 A is that this common electrode and touch-control drive layer 350 to be positioned at the below of liquid crystal layer 340.
Fig. 3 D is the another configuration diagram of known In-cell multi-touch panel.The difference of itself and Fig. 3 C is that induction electrode layer 380 is positioned at the below of top glass substrate 370.
No matter be the In-cell multi-touch panel framework of Fig. 3 A, Fig. 3 B, Fig. 3 C or Fig. 3 D, it is all utilize time-sharing approach, (display cycle) and touch-control sensing cycle (touch cycle) will be cut into the display cycle in the time of a display frame (frame), reach the common electrode layer (Vcom) of shared display panel and the object of the driving layer in touch-control sensor.Its clock respectively as such as Fig. 4 A, Fig. 4 B, Fig. 4 C or and Fig. 4 D shown in.
As shown in Figure 4 A, it is divided into a display cycle and a touch-control sensing cycle by the time of a display picture frame frame, and first performs the frame picture frame display of display panel, then performs touch-control sensing.As shown in Figure 4 B, it first performs touch-control sensing, then performs the frame picture frame display of display panel.As shown in Figure 4 C, it first performs the part lines of display picture frame frame in period A, then performs touch-control sensing, in period B, finally perform the residue lines of this picture frame frame of display.As shown in Figure 4 D, it changes the vertical synchronizing signal (Vsync) of display, with when vertical synchronizing signal (Vsync) is for noble potential, performs the frame display of display panel, when vertical synchronizing signal (Vsync) is for electronegative potential, perform touch-control sensing.
In the early stage publication US 2012/0050217 of United States Patent (USP), the strategy identical with Fig. 4 A taked by the clock of the FIG.8 of its first embodiment, first performs the picture frame frame display of display panel, then perform touch-control sensing.The strategy identical with Fig. 4 C then taked by its clock showing the FIG.17 of the second embodiment, and it first first performs the part lines of display picture frame frame in period A, then performs touch-control sensing, in period B, finally perform the residue lines of this picture frame frame of display.The read clock of the FIG.19 of its display the 3rd embodiment is identical with its first embodiment, that is take the strategy identical with Fig. 4 A, itself and the first embodiment difference are to utilize common electrode layer (Vcom) bifurcation thixotroping (toggle) shown as triggering, to carry out touch detection.Its first embodiment and the 3rd embodiment are use the method for timesharing to be dispersed in by touch-control sensing in each article of display line, and the second embodiment uses the method for timesharing to be disperseed by touch-control sensing in each display picture frame frame (frame), no matter the first embodiment, the 3rd embodiment or the second embodiment, the setting time (Settling time) of display data and touch data all can be sacrificed.
But, this kind of time-sharing work (time sharing) mode along with the resolution of display panel more and more higher, the required pixel promoted of display driving integrated circuit also gets more and more, and the time therefore needed is also more and more longer.But because display frame turnover rate (display frame rate) must maintain more than 60Hz, namely each frame all only has 16.6 milliseconds, but it is more and more higher in the resolution due to display panel, video picture and touch-control sensing to be performed in 16.6 milliseconds, also more and more difficult, also limit the lifting of image resolution, in known techniques, there is the problem that touch-control display panel resolution cannot promote.Therefore, the real space be still improved of known In-cell multi-touch liquid crystal display panel system.
Summary of the invention
The invention provides a kind of In-cell multi-touch panel system, to solve the problem that in known techniques, display panel resolution cannot promote, simultaneously without the need to changing the read clock of existing display panel, and the common electrode layer (Vcom) in display panels can be allowed still can to share same layer transparent conductive body, to save cost with the driving in touch-control sensor.
The technological means that the present invention adopts is as follows: a kind of In-cell multi-touch liquid crystal display panel system, comprising:
Touch control LCD (Liquid Crystal Display) panel, it has:
Tft layer, it has K bar raster data model line and L bar source drive line, and according to display pixel signal and display drive signals, in order to drive corresponding transistor and electric capacity, and then perform display operation, wherein, K, L are positive integer;
Induction electrode layer, it has M bar first conductor lines, and whether according to touch-control drive singal, have external object close in order to induction, wherein, M is positive integer; And
Common electrode and touch-control drive layer, it has N bar second conductor lines, when being used to perform described display operation, accept common voltage, and when performing touch-control sensing, accept described touch-control drive singal, wherein, N is positive integer, and K is greater than N, described M bar first conductor lines and L bar source drive line are positioned at first direction, and described K bar raster data model line and N bar second conductor lines are positioned at second direction; And
Touch-control display and control subsystem, be connected to described tft layer, induction electrode layer, common electrode and touch-control drive layer, for sequentially supplying described display drive signals to described K bar raster data model line, so that the described transistor of correspondence is opened, and supply described display pixel signal to described L bar source drive line, and then perform described display operation, and described touch-control display and control subsystem is for supplying described touch-control drive singal to described N bar second conductor lines, and sample induced voltage by described M bar first conductor lines, whether there is external object close with detecting,
Described K bar raster data model line is divided into N group, each group raster data model line corresponds to second conductor lines respectively, when one group of raster data model line receives described display drive signals, its corresponding described second conductor lines is then connected to described common voltage, when described touch-control display and control subsystem is for the described touch-control drive singal to the i-th of supply the second conductor lines, described touch-control display and control subsystem first judges whether the same time has described display drive signals to the i-th group raster data model line of supply, if not, described touch-control display and control subsystem supplies described touch-control drive singal to the i-th the second conductor lines.
Adopt In-cell multi-touch liquid crystal display panel system provided by the invention, except touch control sensing circuit being integrated in known display panels, simultaneously, common electrode layer (Vcom) in display panels and the driving in touch-control sensor can be shared same layer transparent conductive body, and then save cost.Further, the present invention can drive liquid crystal display through different driving clocks simultaneously and carry out touch-control sensing, can also solve display and touch-control sensing timesharing in known techniques completely and drive the problem of rear deficiency of time, and then can not hinder display panel increase resolution.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of known self-induction capacitance sensing;
Fig. 2 is the schematic diagram of known mutual induction capacitance sensing;
Fig. 3 A to Fig. 3 D is the configuration diagram of known In-cell multi-touch panel;
Fig. 4 A to Fig. 4 D is the clocking schemes of known In-cell multi-touch panel;
Fig. 5 is the calcspar of In-cell multi-touch liquid crystal display panel system of the present invention;
Fig. 6 is the clock figure that touch-control display and control subsystem of the present invention carries out video picture and touch-control sensing one embodiment simultaneously;
Fig. 7 is the clock figure that touch-control display and control subsystem of the present invention carries out video picture and another embodiment of touch-control sensing simultaneously;
Fig. 8 is the clock figure that touch-control display and control subsystem of the present invention carries out video picture and the another embodiment of touch-control sensing simultaneously;
Fig. 9 is the clock figure that touch-control display and control subsystem of the present invention carries out video picture and the another embodiment of touch-control sensing simultaneously;
Figure 10 is that Fig. 9 embodiment carries out the differential ference spiral structural drawing of touch detection to touch-control drive singal;
Figure 11 is that Fig. 9 embodiment carries out the differential ference spiral processing procedure figure of touch detection to touch-control drive singal;
To be Fig. 9 embodiment will move on to the expansion of more than DC-VCOM on whole for string wave voltage to Figure 12;
Figure 13 is that Fig. 9 embodiment changes string ripple the expansion of square wave into;
Figure 14 is that Fig. 9 embodiment changes string ripple into square wave, and output level is all moved on to the expansion above DC-VCOM;
Figure 15 is the detailed circuit diagram of In-cell multi-touch liquid crystal display panel system of the present invention;
Figure 16 is the clock figure that this touch-control display and control subsystem 520 of the present invention carries out video picture and touch-control sensing one embodiment simultaneously;
Primary clustering symbol illustrates:
Drive and sensor 110 drives and sensor 120
Driver 210 sensor 220
Lower polarizing layer 310 lower glass substrate 320
Tft layer 330 liquid crystal layer 340
Common electrode and touch-control drive layer 350
Chromatic filter layer 360 top glass substrate 370
Polarizing layer 390 on induction electrode layer 380
In-cell multi-touch liquid crystal display panel system 500
Touch control LCD (Liquid Crystal Display) panel 510 touch-control display and control subsystem 520
Source electrode driving device 905 gate drive apparatus 910
Sensing apparatus 915 touch-control drive singal generation device 920
Common voltage generation device 925 switching device shifter 930
Control device 935 can gain-programmed amplifier 940
Analog-to-digital converter 945 coordinate judgment means 950
Read clock controller 9351 touch-control clock controller 9353;
Embodiment
Clearly understand to make object of the present invention, technical scheme and advantage, below in conjunction with drawings and Examples, the present invention is further elaborated, is to be understood that, specific embodiment described herein only for explaining the present invention, is not intended to limit the present invention.
Fig. 5 is the calcspar of In-cell multi-touch liquid crystal display panel system 500 of the present invention, and this In-cell multi-touch liquid crystal display panel system 500 comprises touch control LCD (Liquid Crystal Display) panel 510 and a touch-control display and control subsystem 520.
This touch control LCD (Liquid Crystal Display) panel 510 has tft layer 330, induction electrode layer 380, common electrode and touch-control drives layer (Vcom) 350, and the permutation and combination of the stacked manner of the tft layer 330 of this touch control LCD (Liquid Crystal Display) panel 510, common electrode and touch-control driving layer (Vcom) 350 and induction electrode layer 380 can be any one in Fig. 3 A to Fig. 3 D.
This tft layer 330 has K bar raster data model line (G1, G2 ..., GK) and L bar source drive line (SOURCE 1, SOURCE2, ..., SOURCEL), in order to foundation one display pixel signal and a display drive signals, the transistor driving the pixel on display panels corresponding and electric capacity, to perform display operation, wherein, K, L are positive integer.For convenience of description, in the present embodiment, K is 800, L is 600.
The driving component of this tft layer 330 is thin film transistor (TFT) (TFT) in the present embodiment, low-temperature polysilicon film transistor (Low Temperature Poly-silicon TFT, LTPS TFT), indium oxide gallium zinc thin film transistor (TFT) (Indium Gallium Zinc Oxide TFT, IGZO TFT) or continuous silicone particle (continuous grain silicon, CGS) is can be in other embodiment.
This induction electrode layer 380 has M bar first conductor lines (RX1, RX2 .., RXM), and according to a touch-control drive singal, in order to respond to close external object, wherein, M is positive integer, and in the present embodiment, M is 12.
This common electrode and touch-control drive layer (Vcom) 350 its have N bar second conductor lines (Vcom1, Vcom2 ..., VcomN), when showing, accept a common voltage (Vcom), and when touch-control sensing, accept this touch-control drive singal, wherein, N is positive integer, and K is greater than N, in the present embodiment, N is 20.
This M bar first conductor lines (RX1, RX2 .., RXM) and L bar source drive line (SOURCE 1, SOURCE 2 ... SOURCE L) be positioned at a first direction (Y), this K bar raster data model line (G1, G2 ..., and this N bar second conductor lines (Vcom1 GK), Vcom2 ..., VcomN) be positioned at a second direction (X).Wherein, this first direction and this second direction orthogonal.
In the present embodiment, this K bar raster data model line (G1, G2 ..., GK) and this N bar second conductor lines (Vcom1, Vcom2, ..., VcomN) there is corresponding relation, that is raster data model line G1 to G40 corresponds to the second conductor lines Vcom1, raster data model line G41 to G80 corresponds to the second conductor lines Vcom2, sequentially analogizes.That is raster data model line G1 to G40 is first group, raster data model line G41 to G80 is second group ..., raster data model line G761 to G800 is the 20 group.Illustrate further, first group of raster data model line G1 to G40 ties up to this tft layer 330, and the second conductor lines Vcom1 of correspondence ties up to this common electrode and touch-control drives same position place in layer (Vcom) 350, and other is also like this., even if K is the integral multiple of N, do not need certain average packet herein yet, only need K bar raster data model line to be divided into N group, set up corresponding relation.
When K is not the integral multiple of N, such as, K is 802, when N is 20, raster data model line G1 to G41 corresponds to the second conductor lines Vcom1, and raster data model line G42 to G82 corresponds to the second conductor lines Vcom2, raster data model line G83 to G122 corresponds to the second conductor lines Vcom3, sequentially analogizes.Certainly, also according to other modes, K bar raster data model line can be divided into N group, respectively corresponding N bar second conductor lines.
This touch-control display and control subsystem 520 is connected to this tft layer 330, this induction electrode layer 380, and this common electrode and touch-control drive layer (Vcom) 350, this touch-control display and control subsystem 520 sequentially supply should display drive signals to this K (800) bar raster data model line, in order to the transistor of correspondence is opened, and for should display pixel signal to this L (600) bar source drive line, to perform display operation, this touch-control display and control subsystem 520 sequentially supply should touch-control drive singal to this N bar second conductor lines (Vcom1, Vcom2, ..., Vcom20), and by this M bar first conductor lines (RX1, RX2, .., RX12) induced voltage is sampled, whether there is external object close in order to detecting.
This K (800) bar raster data model line is divided into N (20) group, each group raster data model line corresponds to second conductor lines, when wherein one group of raster data model line receives this display drive signals, this corresponding second conductor lines is then connected to this common voltage (Vcom), in order to as ground connection during display.
The principle of work of this touch-control display and control subsystem 520 of the present invention is: when this touch-control display and control subsystem 520 for should touch-control drive singal to the i-th the second conductor lines time, this touch-control display and control subsystem 520 first judges whether to have for should display drive signals to the i-th group raster data model line simultaneously, if not, the confession of this touch-control display and control subsystem 520 should touch-control drive singal to the i-th the second conductor lines.By this, realize video picture and touch-control sensing simultaneously.If so, the order that touch signal drives is changed, such as: first drive i+1 bar second conductor lines.
Fig. 6 is the clock figure that this touch-control display and control subsystem 520 of the present invention carries out an embodiment of video picture and touch-control sensing simultaneously.First, when this touch-control display and control subsystem 520 for should display drive signals to the 1st group of raster data model line time, this touch-control display and control subsystem 520 for should common voltage (Vcom) to this N bar second conductor lines, be connected to this common voltage (Vcom) to allow this N bar second conductor lines.
When this touch-control display and control subsystem 520 for should display drive signals to the i-th group raster data model line time, this touch-control display and control subsystem 520 for should touch-control drive singal to the i-th-1 the second conductor lines, wherein, i=2 ~ N.
When this touch-control display and control subsystem 520 is for should after display drive signals to N group raster data model line, the confession of this touch-control display and control subsystem 520 should touch-control drive singal to N article of the second conductor lines.
In the clock figure of Fig. 6, the clock of display section completely without the need to changing, that is this touch-control display and control subsystem 520 supply display drive signals to K bar raster data model line (G1, G2 ..., G800) clock identical with the clock of original LCD.As shown in Figure 6, after vertical synchronizing signal (Vsync) has been come, first group of raster data model line G1 to G40, namely first sequentially drive at the raster data model line G1 to G40 of the second conductor lines Vcom1 same position, now the second conductor lines Vcom1 does not change, namely this touch-control display and control subsystem 520 do not supply should touch-control drive singal to this second conductor lines Vcom1.This touch-control display and control subsystem 520 for should common voltage (Vcom) to the second conductor lines of the second conductor lines Vcom1 and other N-1 bar, be connected to this common voltage (Vcom) to allow this N bar second conductor lines.
After raster data model line is sequentially driven to G40, this touch-control display and control subsystem 520 start for should touch-control drive singal to this second conductor lines Vcom1, and by this M bar first conductor lines (RX1, RX2, .., RX12) sample induced voltage, whether have this external object close in order to detect this second conductor lines Vcom1 region.
After raster data model line is sequentially driven to G80, this touch-control display and control subsystem 520 start for should touch-control drive singal to this second conductor lines Vcom2, and by this M bar first conductor lines (RX1, RX2, .., RX12) sample induced voltage, whether have external object close in order to detect this second conductor lines Vcom2 region.Sequentially analogize.
As shown in Figure 6, sequentially the display in the second conductor lines Vcom1 ~ Vcom20 region and touch data are all finished, the clock wherein as display can not need because of performing touch detection do timesharing or shorten driving time completely.
Fig. 7 is the clock figure that this touch-control display and control subsystem 520 of the present invention carries out video picture and another embodiment of touch-control sensing simultaneously.As shown in Figure 7, this touch-control display and control subsystem 520 according to after a Preset Time simultaneously for should display drive signals to this N group raster data model line (G1, G2, ..., G800) and for should touch-control drive singal to this N bar second conductor lines (Vcom1, Vcom2 ..., Vcom20).As shown in Figure 7, this touch-control display and control subsystem 520 after vertical synchronizing signal (Vsync) through a VBP time (choosing of this VBP time is determined according to application), this touch-control display and control subsystem 520 in this Preset Time (after the VBP time) sequentially for should display drive signals to the 1st group of raster data model line to N group raster data model line.Meanwhile, this touch-control display and control subsystem 520 in this Preset Time (after the VBP time) sequentially supply should touch-control drive singal to the 2nd article of the second conductor lines to N article of the second conductor lines and the 1st article of the second conductor lines.
Figure 7 shows that the control clock of another kind of same concept, time needed for its hypothesis driven second conductor lines Vcom1 is less than the time driven needed for a group raster data model line G1 to G40, therefore, after vertical synchronizing signal (Vsync), this touch-control display and control subsystem 520 first sequentially drives first group of raster data model line G1 to G40, wherein, this first group of raster data model line G1 to G40 drives the position of layer (Vcom) 350 identical with this second conductor lines Vcom1 at this common electrode and touch-control in the position of this tft layer 330.During the first sequentially driving of this touch-control display and control subsystem 520 first crowd of raster data model line G1 to G40, this touch-control display and control subsystem 520 is for should touch-control drive singal to the second conductor lines Vcom2, and sequentially supply should touch-control drive singal to the second conductor lines Vcom3, Vcom4, ..., Vcom20, finally supplying should touch-control drive singal to the second conductor lines Vcom1, and then the touch-control completing a whole touch-control picture scans program.
Illustrate further, adopt driving method of the present invention, only need to confirm for should touch-control drive singal to the second conductor lines Vcom1 time, this touch-control display and control subsystem 520 for should display drive signals to after G40, would not problem be had.
Meanwhile, please note touch-control line scan that frequency not necessarily will equal display line scan frequency.Touch Screen scan that frequency also not necessarily will equal display screen scan frequency.The beginning scan time of Touch Screen also not necessarily will to start displaying time synchronous with display screen.In addition, the driving frequency of touch-control drive singal on the second wire body (Vcom), does not also need identical with display line sweep frequency, for example, when the renewal frequency of display screen is 60Hz, and the scanning frequency and can not be limited to 60Hz of Touch Screen.
Fig. 8 is the clock figure that this touch-control display and control subsystem 520 of the present invention carries out video picture and the another embodiment of touch-control sensing simultaneously.When this touch-control display and control subsystem 520 non-coherently (non-sequential) for should touch-control drive singal to the i-th the second conductor lines time, this touch-control display and control subsystem 520 first judges whether to have for should display drive signals to the i-th group raster data model line simultaneously, if have, this touch-control display and control subsystem 520 for should touch-control drive singal to other second conductor lines except i-th the second conductor lines, if no, this touch-control display and control subsystem 520 for should touch-control drive singal to this i-th the second conductor lines.As shown in Figure 8, the confession of this touch-control display and control subsystem 520 non-coherently (non-sequential) should touch-control drive singal to the i-th the second conductor lines.
Fig. 9 is the clock figure that touch-control display and control subsystem 520 of the present invention carries out the another embodiment of developing device touch-control sensing simultaneously.When this touch-control display and control subsystem 520 supplies plural touch-control drive singal to the i-th the second conductor lines simultaneously, namely there are most VCOM the same time simultaneously as touch-control drive end.These touch-control drive singal, at one time the summation convergence 0 of the coupling electricity of counter plate, effectively can reduce the interference of other display on counter plate, and increase the enlargement factor of back end signal.Referring to Fig. 9, drive with string ripple for two touch-control drive singal simultaneously, can find to drive for a pair between two simultaneously, its amplitude, frequency are identical, phase 180 degree, therefore the coupling effect of other signal on counter plate, just can offset, and then significantly alleviate the interference of touching signals to other signals.Algorithm (the Demodulate Method Of Differential Sensing Capacitive Touch of recycling priority patent US2012/0050217, as Figure 10 and Figure 11, specific practice is see US2012/0050217, repeat no more) herein, smoothly by data demodulates out, touch detection can be completed.
Drive the second conductor lines based on plural touch-control drive singal simultaneously, and eliminate coupling effect interference display system, there is following advantage: touch-control drive singal disturbs the display of display panels hardly, touch-control can be completed with display driver simultaneously drive, not take displaying time; Touch-control drive singal is not limited to display, can adjust frequency arbitrarily, with neighbourhood noise of dodging; More single touch-control drive singal, touch-control drive singal can use larger amplitude and not disturb the display of display panel, that is SNR can be significantly improved.
Figure 12 is the expansion of Fig. 9, just on whole for string wave voltage, moves on to more than DC-VCOM.This kind of waveform is easier to realize in reality, and can not have much impact to usefulness.
Figure 13 is the expansion of Fig. 9, just changes string ripple into square wave.Square wave comparatively string ripple easily realizes.
Figure 14 is the expansion of Fig. 9, just changes string ripple into square wave, and is all moved on to above DC-VCOM by output level.
Figure 15 is the detailed circuit diagram of In-cell multi-touch liquid crystal display panel system 500 of the present invention, and this touch-control display and control subsystem 520 comprises common device for generating voltage 925, switching device shifter 930, control device 935, a group of one source pole drive unit 905, gate drive apparatus 910, sensing apparatus 915, touch-control drive singal generation device 920, can gain-programmed amplifier 940, one group of analog-to-digital converter 945 and a coordinate judgment means 950.
This source electrode driving device 905 is connected to this touch control LCD (Liquid Crystal Display) panel 510, in order to drive this touch control LCD (Liquid Crystal Display) panel 510 according to this display pixel signal.
This gate drive apparatus 910 is connected to this touch control LCD (Liquid Crystal Display) panel 510, produces this display drive signals, in order to drive this touch control LCD (Liquid Crystal Display) panel 510.
This sensing apparatus 915 is connected to this touch control LCD (Liquid Crystal Display) panel 510, in order to sense the signal of this touch control LCD (Liquid Crystal Display) panel 510.
This touch-control drive singal generation device 920, in order to produce this touch-control drive singal VIN, wherein, this touch-control drive singal generation device 920 can produce self-induction electric capacity (selfcapacitance) detection technology or the touch-control drive singal VIN of mutual induction electric capacity (mutual capacitance) needed for detection technology.
This common voltage generation device 925 is in order to produce a common voltage (Vcom), and this common voltage can be direct current common voltage (DC-Vcom) or exchanges common voltage (AC-Vcom).
This switching device shifter 930 is connected to this touch control LCD (Liquid Crystal Display) panel 510, this touch-control drive singal generation device 920 and this common voltage generation device 925.
This control device 935 comprises read clock controller 9351 and a touch-control clock controller 9353.This control device 935 is connected to this source electrode driving device 905, this gate drive apparatus 910, this common voltage generation device 925, this sensing apparatus 915, this touch-control drive singal generation device 920, and this switching device shifter 930, this group can gain-programmed amplifier 940, this group of analog-to-digital converter 945, and this coordinate judgment means 950, in order to set this switching device shifter 930, so that this touch-control drive singal or this common voltage (Vcom) are provided to this N bar second conductor lines, set this gate drive apparatus 910 and sequentially export this display drive signals to this K bar raster data model line, and set this source electrode driving device 905 and export this display pixel signal to this L bar source drive line.
This read clock controller 9351 is connected to this source electrode driving device 905, this gate drive apparatus 910 and this common voltage generation device 925, in order to for source electrode driving device 905 and this gate drive apparatus 910 exporting the clock of this display pixel signal and this display drive signals, and control the clock that this common voltage generation device produces this common voltage (Vcom).
This touch-control clock controller 9353 is connected to this read clock controller 9351, this sensing apparatus 915, this touch-control drive singal generation device 920 and this switching device shifter 930, in order to set this switching device shifter 930, so that this touch-control drive singal or this common voltage (Vcom) are provided to this N bar second conductor lines.
This group can be connected to this sensing apparatus 915 by gain-programmed amplifier 940, in order to amplify this M detection signal, and then produces M amplification detection signal.
This group of analog-to-digital converter 945 is connected to this group can gain-programmed amplifier 940, is converted to M digital detection signal in order to this M to be amplified detection signal.
This coordinate judgment means 950 is connected to this group of analog-to-digital converter device 945, according to this M digital detection signal, in order to judge the coordinate position of close external object.
This M bar first conductor lines and this N bar second conductor lines have stray capacitance and stray capacitance respectively, repeatedly locating mutually between this M bar first conductor lines with this N bar second conductor lines forms Inductance and Capacitance mutual induction electric capacity (mutual capacitance, Cm) respectively.First conductor lines (RX1, RX2 .., RX12) and the second conductor lines (Vcom1, Vcom2 ..., Vcom20) in the ground capacitance of each strip conductor line be self-induction electric capacity (Cs).
There is in this sensing apparatus 915 M sensing circuit, in order to detect aforementioned Inductance and Capacitance, and then produce a corresponding M detection signal.
Each sensing circuit of this sensing apparatus 915 is formed 9153 by an operational amplifier 9151 and a back coupling electric capacity, one end of this back coupling electric capacity 9153 is connected to the inverting input of this operational amplifier 9151, the other end is connected to the output terminal of this operational amplifier 9151, the inverting input of this operational amplifier 9151 be connected to this M bar first conductor lines one of them, the non-inverting input of this operational amplifier 9151 is connected to this common voltage (Vcom).
Figure 16 is that this touch-control display and control subsystem 520 of the present invention carries out showing and the clock figure of touch-control sensing one embodiment simultaneously.It exchanges common voltage (AC-Vcom) with Fig. 7 Main Differences for this common voltage generation device 925 produces, that is this touch-control display and control subsystem 520 sequentially supply should display drive signals to the 1st group of raster data model line G1 ~ G40 time, in the same time, this common voltage generation device 925 produces and exchanges common voltage (AC-Vcom) to this corresponding second conductor lines Vcom1, for exchanging common voltage (AC-Vcom) on this second conductor lines Vcom1, but not this touch-control drive singal.Now, 520 confessions of this touch-control display and control subsystem should touch-control drive singal to the second conductor lines Vcom2.
From aforementioned explanation, the present invention is except being integrated in known display panels by touch control sensing circuit, meanwhile, and the common electrode layer (Vcom) in display panels and the driving in touch-control sensor are shared same layer, and then save cost.Compared to known techniques, in order to will show and touch-control sensing employing time-sharing work, and the common electrode layer of non-invention in display panels (Vcom) and the driving of touch-control sensing still can share same layer transparent conductive body, illustrate further, the present invention can drive liquid crystal display through different driving clocks simultaneously and carry out touch-control sensing, can also solve the problem of known techniques display and the rear deficiency of time of touch-control sensing timesharing driving completely.
The embodiment one of the early stage publication US 2012/0050217 of United States Patent (USP) uses the method for timesharing to be dispersed in by touch-control sensing in each display line, and embodiment two uses the method for timesharing to be disperseed by touch-control sensing in each display picture frame (frame), the setting time (Settling time) of display data and touch data therefore can be sacrificed.Embodiment three utilizes common electrode layer (Vcom) bifurcation thixotroping (toggle) of display as triggering in addition, to carry out touch detection, although be that display is carried out with touch-control equally simultaneously, but the signal that the common electrode layer (Vcom) sharing display is touch-control, but touch detection can be limited to the clock of display, suitable touch detection frequency therefore cannot be selected.
Given this, known advantage of the present invention is as follows:
1. can adopt on original framework, the common electrode layer (Vcom) in display panels still can share same layer transparent conductive body, in order to save cost with the driving in touch-control sensor.
2. when display panels drive time, except showing raster data model line (G1, G2 ..., GK) corresponding to the second conductor lines outside, have at least one can carry out driving to detect touch-control in remaining second conductor lines simultaneously.That is, the present invention can carry out in Display panel and touch detection simultaneously, and use respective signal (DC-Vcom, AC-Vcom, VIN) at the second conductor lines (Vcom1 of different bar, Vcom2, ..., VcomN) get, so do not need the time of sacrificing any Display panel and touch detection simultaneously.
3. the raster data model line (G1 of display panels, G2, ..., and source drive line (SOURCE 1 GK), SOURCE 2, SOURCE L) clock need not coordinate touch-control sensing and do and change, computing is made via reading display panels coherent signal (such as: Vsync/Hsync) completely by this touch-control clock controller, in order to the second conductor lines (Vcom1 of display panels just corresponding to update area that dodge, Vcom2 ..., VcomN).
4. technology of the present invention, the raster data model line that touching signals can be made automatically to dodge showing (G1, G2 ..., GK) the second conductor lines (Vcom1 corresponding to, Vcom2 ..., VcomN), with so as not to supply simultaneously should common voltage (Vcom) and this touch-control drive singal at same second conductor lines (Vcom1, Vcom2 ..., VcomN).So, the clock (display timing) of Display panel does not need to do any change.That is touch detection does not also need synchronous with Display panel, can realize easily if Display panel is 60Hz, but the touch detection situation that to be 100Hz etc. asynchronous.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (15)
1. an In-cell multi-touch liquid crystal display panel system, comprising: touch control LCD (Liquid Crystal Display) panel and touch-control display and control subsystem;
Wherein, touch control LCD (Liquid Crystal Display) panel, it has:
Tft layer, it has K bar raster data model line and L bar source drive line, and according to display pixel signal and display drive signals, in order to drive corresponding transistor and electric capacity, and then perform display operation, wherein, K, L are positive integer;
Induction electrode layer, it has M bar first conductor lines, and whether according to touch-control drive singal, have external object close in order to induction, wherein, M is positive integer;
It is characterized in that, described touch control LCD (Liquid Crystal Display) panel also comprises common electrode and touch-control drives layer, and it has N bar second conductor lines, when being used to perform described display operation, accept common voltage, and when performing touch-control sensing, accept described touch-control drive singal, wherein, N is positive integer, and K is greater than N, described M bar first conductor lines and L bar source drive line are positioned at first direction, and described K bar raster data model line and N bar second conductor lines are positioned at second direction; And
Touch-control display and control subsystem is connected to described tft layer, induction electrode layer, common electrode and touch-control and drives layer, for sequentially supplying described display drive signals to described K bar raster data model line, so that the described transistor of correspondence is opened, and supply described display pixel signal to described L bar source drive line, and then perform described display operation, and described touch-control display and control subsystem is for supplying described touch-control drive singal to described N bar second conductor lines, and sample induced voltage by described M bar first conductor lines, whether there is external object close to detect;
Described K bar raster data model line is divided into N group, each group raster data model line corresponds to second conductor lines respectively, when one group of raster data model line receives described display drive signals, its corresponding described second conductor lines is then connected to described common voltage, when described touch-control display and control subsystem is for the described touch-control drive singal to the i-th of supply the second conductor lines, described touch-control display and control subsystem first judges whether the same time has described display drive signals to the i-th group raster data model line of supply, if not, described touch-control display and control subsystem supplies described touch-control drive singal to the i-th the second conductor lines.
2. In-cell multi-touch liquid crystal display panel system according to claim 1, it is characterized in that, when described touch-control display and control subsystem supplies described display drive signals to the i-th group raster data model line, described touch-control display and control subsystem supplies described touch-control drive singal to the i-th-1 the second conductor lines, in the middle of, i=2 ~ N.
3. In-cell multi-touch liquid crystal display panel system according to claim 2, it is characterized in that, when described touch-control display and control subsystem supplies described display drive signals to the 1st group of raster data model line, described touch-control display and control subsystem supplies described common voltage to described N bar second conductor lines, is connected to described common voltage in order to make described N bar second conductor lines.
4. In-cell multi-touch liquid crystal display panel system according to claim 3, it is characterized in that, when described touch-control display and control subsystem is for should after display drive signals to N group raster data model line, described touch-control display and control subsystem supplies described touch-control drive singal to N article of the second conductor lines.
5. In-cell multi-touch liquid crystal display panel system according to claim 1, it is characterized in that, described touch-control display and control subsystem is according to side by side supplying described display drive signals after Preset Time to described N group raster data model line and described touch-control drive singal extremely described N bar second conductor lines, described touch-control display and control subsystem sequentially supplies described display drive signals in the 1st group of raster data model line to N group raster data model line after described Preset Time, described touch-control display and control subsystem sequentially supplies described touch-control drive singal in the 2nd article of the second conductor lines to N article of the second conductor lines after described Preset Time, and the 1st article of the second conductor lines.
6. In-cell multi-touch liquid crystal display panel system according to claim 5, is characterized in that, described touch-control display and control subsystem non-coherently supplies described touch-control drive singal to the i-th the second conductor lines.
7. In-cell multi-touch liquid crystal display panel system according to claim 5, is characterized in that, a plurality of described touch-control drive singal to the i-th the second conductor lines of described touch-control display and control subsystem supply.
8. In-cell multi-touch liquid crystal display panel system according to claim 7, is characterized in that, described a plurality of touch-control drive singal is two, and described two touch-control drive signal amplitude, frequency are identical, phase 180 degree.
9. In-cell multi-touch liquid crystal display panel system according to claim 8, is characterized in that, described touch-control drive singal is string ripple or square wave.
10. In-cell multi-touch liquid crystal display panel system according to claim 6, is characterized in that, described touch-control display and control subsystem comprises:
Source electrode driving device, is connected to described touch control LCD (Liquid Crystal Display) panel, in order to drive described touch control LCD (Liquid Crystal Display) panel according to described display pixel signal;
Gate drive apparatus, is connected to described touch control LCD (Liquid Crystal Display) panel, in order to produce described display drive signals, and then drives described touch control LCD (Liquid Crystal Display) panel;
Sensing apparatus, is connected to described touch control LCD (Liquid Crystal Display) panel, in order to sense the signal of described touch control LCD (Liquid Crystal Display) panel;
Touch-control drive singal generation device, in order to produce described touch-control drive singal;
Common voltage generation device, in order to produce described common voltage;
Switching device shifter, is connected to described touch control LCD (Liquid Crystal Display) panel, described touch-control drive singal generation device, and described common voltage generation device; And
Control device, be connected to described source electrode driving device, gate drive apparatus, common voltage generation device, sensing apparatus, touch-control drive singal generation device and switching device shifter, in order to set described switching device shifter, and then described touch-control drive singal or described common voltage are provided to described N bar second conductor lines, set described gate drive apparatus and sequentially export described display drive signals to described K bar raster data model line, and set described source electrode driving device and export described display pixel signal to described L bar source drive line.
11. In-cell multi-touch liquid crystal display panel system according to claim 10, is characterized in that, described control device comprises:
Read clock controller, be connected to described source electrode driving device, gate drive apparatus and common voltage generation device, export the clock of described display pixel signal and described display drive signals in order to supply described source electrode driving device and described gate drive apparatus, and described common voltage generation device produces the clock of described common voltage; And
Touch-control clock controller, is connected to described read clock controller, sensing apparatus, touch-control drive singal generation device and switching device shifter, in order to set switching device shifter, so that described touch-control drive singal or described common voltage are provided to described N bar second conductor lines.
12. In-cell multi-touch liquid crystal display panel system according to claim 11, it is characterized in that, described M bar first conductor lines and described N bar second conductor lines have stray capacitance and stray capacitance respectively, repeatedly locate to form Inductance and Capacitance respectively mutually between described M bar first conductor lines with described N bar second conductor lines.
13. In-cell multi-touch liquid crystal display panel system according to claim 12, is characterized in that, described sensing apparatus has M sensing circuit, in order to detect described Inductance and Capacitance, and then produce a corresponding M detection signal.
14. In-cell multi-touch liquid crystal display panel system according to claim 13, is characterized in that, described touch-control display and control subsystem more comprises:
One group can gain-programmed amplifier, is connected to described sensing apparatus, in order to amplify a described M detection signal, and then produces M amplification detection signal;
One group of analog-to-digital converter, being connected to described group can gain-programmed amplifier, is converted to M digital detection signal described M to be amplified detection signal; And
Coordinate judgment means, is connected to described one group of analog-to-digital converter device, according to described M digital detection signal, to judge the coordinate position of described close external object.
15. In-cell multi-touch liquid crystal display panel system according to claim 14, it is characterized in that, a described M sensing circuit is made up of operational amplifier and back coupling electric capacity respectively, one end of described back coupling electric capacity is connected to the inverting input of described operational amplifier, the other end is connected to the output terminal of described operational amplifier, the inverting input of described operational amplifier be connected to described M bar first conductor lines one of them, the non-inverting input of described operational amplifier is connected to described common voltage.
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