CN102707480A - 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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- CN102707480A CN102707480A CN2012102181750A CN201210218175A CN102707480A CN 102707480 A CN102707480 A CN 102707480A CN 2012102181750 A CN2012102181750 A CN 2012102181750A CN 201210218175 A CN201210218175 A CN 201210218175A CN 102707480 A CN102707480 A CN 102707480A
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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 the contact panel field, relate in particular to a kind of embedded multi-point touch display panels system.
Background technology
The know-why of contact panel is when finger or other medium when touching screen, according to different induction modes, and detecting voltage, electric current, sound wave or infrared ray etc., and then measure the coordinate position of touch point.For example electric resistance touch-control panel is and utilizes upper and lower interelectrode potential difference (PD), goes out the touch point place in order to calculate the compression point position probing.The capacitance type touch-control panel capacitance variations that to be the transparency electrode of utilize arranging with static between the human body combine is produced detects its coordinate from the curtage that is produced.
According to the capacitance touching control know-why, it can be divided into surface-type capacitance touching control sensing (Surface Capacitive) and these two kinds of technology of projecting type capacitor touch-control sensing (Projected Capacitive).Though surface-type capacitance sensing Technical Architecture simple structure; But be difficult for to realize multi-point touch and difficulty overcome electromagnetic interference (EMI) (Electromagnetic Disturbance; EMI) and the problem of the news of making an uproar, make and to develop towards the projected capacitive touch detection technology mostly now.
Projecting type capacitor touch-control sensing technology can be divided into self-induction capacitor type (Self capacitance) and Inductance and Capacitance type (Mutual capacitance) again.The self-induction capacitor type is meant between touch control object and conductor lines and produces capacitive coupling, and the definite touching generation of the capacitance variations of measurement conductor lines, yet the Inductance and Capacitance type is when touching generation, can between the two-layer conductor lines of vicinity, producing the capacitive coupling phenomenon.
The self-induction electric capacity of convention (self capacitance) detection technology is each strip conductor line ground capacitance (Cs) of sensing; Judged whether that through the variation of ground capacitance value object is near capacitance type touch-control panel; Wherein, Self-induction electric capacity or ground capacitance are not entity capacitance, and it is the parasitism and the stray capacitance of each strip conductor line.Fig. 1 is the synoptic diagram of convention self-induction electric capacity (self capacitance) sensing, and it is in the cycle very first time, and the conductor lines that drives first directions by the driving and the sensor 110 of first direction earlier is in order to self-induction electric capacity (Cs) charging to the conductor lines of first direction.In second time cycle, the online voltage of conductor of driving and sensor 110 detecting first directions is in order to obtain m data again.Again in the 3rd time cycle, the conductor lines that drives second directions by the driving and the sensor 120 of second direction is with the self-induction electric capacity charging to the conductor lines of second direction.In the 4th time cycle, the online voltage of conductor of driving and sensor 120 detecting second directions is to obtain n data again.Therefore, can obtain m+n data altogether.
Convention self-induction electric capacity (self capacitance) method for sensing among Fig. 1 is at online driving circuit and the sensing circuit of being connected with simultaneously of same strip conductor; After earlier conductor lines being driven; Again to the variable quantity of same its signal of conductor lines sensing, with decision self-induction capacitance size.Its benefit is:
(1) data volume is less, and the single image (image) of contact panel has only m+n data, saves hardware cost;
(2) image untreatment datas (image raw data) are obtained fast, so required time of sensing touch points is less.Because all first direction conductor lines are sensing (certainly also sensing) one by one simultaneously; And then simultaneously all conductor lines of second direction are driven and sensing; Twice different directions conductor lines sensor operation just can be finished a picture frame; So data volume is less, it is also few a lot of to transfer sensing signal to the digital signal required time by simulating signal in execution simultaneously; And
(3) because the amount of data processing is less, so have lower power consumption.
But the corresponding shortcoming of self-induction electric capacity (self capacitance) method for sensing then is:
When (1) suspension joint conductor (like water droplet, oil stain or the like) being arranged on contact panel, cause the touch points erroneous judgement easily; And
(2) when simultaneously multi-point touch being arranged on the contact panel, 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.
Yet; The capacitance type touch-control panel method of driving is sensing mutual induction electric capacity (mutual capacitance; Cm) size variation is in order to have judged whether that object is near contact panel, likewise; Mutual induction electric capacity (Cm) is not entity capacitance, and it is a mutual induction electric capacity (Cm) between the conductor lines of conductor lines and second direction of first direction.Fig. 2 is the synoptic diagram of convention mutual induction electric capacity (Cm) sensing, and as shown in Figure 2, driver 210 is disposed on the first direction (Y); Sensor 220 is disposed on the second direction (X), before very first time cycle T 1 during the semiperiod, is driven by the conductor lines 230 of 210 pairs of first directions of driver; Its working voltage Vy_1 is to mutual induction electric capacity (Cm) 250 charging, when later half cycle of very first time cycle T 1, and the voltage (Vo_1 on the conductor lines 240 of all the sensors 220 all second directions of sensing; Vo_2 ..., Vo_n); To obtain n data, behind m drive cycle, can obtain m * n data.
The advantage of mutual induction electric capacity (Cm) method for sensing is:
(1) the signal different directions of suspension joint conductor and earth conductor is so can judge whether to be the human body touching very easily; And
(2) because the true coordinate of each point is arranged, when multiple spot touches simultaneously, can tell the actual position of each point, mutual induction electric capacity (Cm) method for sensing is supported the application of multi-point touch easily.
Coinciding about the touch control type planar display of convention system directly carries out contact panel and flat-panel screens; Because the contact panel that is coincided is transparent panel; Thereby the image of flat-panel screens can penetrate contact panel and then the show image that coincides above that, and through media or the interface of contact panel as input.
Yet the technology of this convention because when coinciding, must increase the weight of a contact panel; Make flat-panel screens weight increase significantly, do not meet current market, illustrate further for the compact requirement of display; And when directly coinciding contact panel and flat-panel screens, on thickness, increased the thickness of contact panel itself; Reduced the penetrance of light, increased reflectivity and mist degree, the quality of screen display is had a greatly reduced quality.
To aforesaid shortcoming, touch control type planar display changes the embedded type touch control technology of adopting.Embedded type touch control technology main developing direction at present can be divided into On-Cell and two kinds of technology of In-Cell.The On-Cell technology is that the induction electrode (Sensor) with projected capacitive touch technology is produced on the panel color optical filter (Color Filter, back side CF) (promptly attaching the Polarizer face) are integrated into the structure of colored filter.The In-Cell technology then is that induction electrode (Sensor) is inserted in the middle of the structure of liquid crystal born of the same parents (LCD Cell); In Cell technology is integrated in touch control component in the display panel; Make display panel itself just possess touch controllable function; Therefore do not need to carry out in addition to fit or the processing procedure of assembling with contact panel, technology all is to be developed by TFT LCD panel factory usually like this.Embedded multi-point touch panel (In-Cell Multi-Touch Panel) technology is ripe gradually, and touch controllable function directly is integrated in the panel procedure for producing, does not need to add one deck touch-control glass again, therefore can keep the thinness of former panel and then reduce cost.
Fig. 3 A is the configuration diagram of the embedded multi-point touch panel of convention (In-Cell Multi-Touch Panel) 300, from bottom to top is following polarizing layer (lower polarizer) 310, lower glass substrate 320, tft layer (TFT or LTPS) 330, liquid crystal layer 340, common electrode and touch-control Drive Layer 350, chromatic filter layer (color filter) 360, top glass substrate 370, induction electrode layer 380 in regular turn, reaches and go up polarizing layer (upper polarizer) 390.Shown in Fig. 3 A; In order to save cost, it is integrated into touch-control sensor in the display panels, and same one deck is shared in common electrode layer (Vcom) in the display panels and the driving in the touch-control sensor; To form this common electrode and touch-control Drive Layer 350, to save cost.380 top that is positioned at this top glass substrate 370 of induction electrode layer.This tft layer (TFT or LTPS) 330 is by thin film transistor (TFT) or low-temperature polysilicon film transistor (Low-Temperature Poly-Si Thin FilmTransistors, LTPS TFTs) 332 and 331 compositions of transparency electrode.
Fig. 3 B is another configuration diagram of the embedded multi-point touch panel of convention.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 the embedded multi-point touch panel of convention.The difference of itself and Fig. 3 A is that this common electrode and touch-control Drive Layer 350 are positioned at the below of liquid crystal layer 340.
Fig. 3 D is the another configuration diagram of the embedded multi-point touch panel of convention.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 embedded multi-point touch panel framework of Fig. 3 A, Fig. 3 B, Fig. 3 C or Fig. 3 D; It all is to utilize time-sharing approach; Be cut into the display cycle (display cycle) and touch-control sensing cycle (touch cycle) in time with a display frame (frame), reach the common electrode layer (Vcom) of shared display panel and the purpose of the Drive Layer in the touch-control sensor.Its clock respectively as as Fig. 4 A, Fig. 4 B, Fig. 4 C or and Fig. 4 D shown in.
Shown in Fig. 4 A, be divided into a display cycle and a touch-control sensing cycle in its time, and carry out the frame picture frame demonstration of display panel earlier a demonstration picture frame frame, carry out touch-control sensing again.Shown in Fig. 4 B, it carries out touch-control sensing earlier, and the frame picture frame of carrying out display panel again shows.Shown in Fig. 4 C, it carries out the part lines that show the picture frame frame earlier in period A, carry out touch-control sensing again, the last residue lines that show this picture frame frame of in period B, carrying out.Shown in Fig. 4 D, it changes the vertical synchronizing signal (Vsync) that shows, with when vertical synchronizing signal (Vsync) is noble potential, the frame of carrying out display panel shows, when vertical synchronizing signal (Vsync) is electronegative potential, carries out touch-control sensing.
Disclose among the case US 2012/0050217 in early days in United States Patent (USP), the clock of the FIG.8 of its first embodiment is taked the strategy identical with Fig. 4 A, and the picture frame frame of carrying out display panel earlier shows, carries out touch-control sensing again.It shows that the clock of the FIG.17 of second embodiment then takes the strategy identical with Fig. 4 C, and it carries out the part lines that show the picture frame frame earlier earlier in period A, carry out touch-control sensing again, the last residue lines that show this picture frame frame of in period B, carrying out.Its read clock of FIG.19 that shows the 3rd embodiment is identical with its first embodiment; That is take the strategy identical with Fig. 4 A; Common electrode layer (Vcom) the bifurcation thixotroping (toggle) that itself and the first embodiment difference are to utilize demonstration is as triggering, to carry out touch detection.Its first embodiment and the 3rd embodiment are dispersed in touch-control sensing in each bar display line for the method for using timesharing; And second embodiment uses the method for timesharing to disperse each to show in the picture frame frame (frame) touch-control sensing; No matter first embodiment, the 3rd embodiment or second embodiment all can sacrifice the setting time (Settling time) of video data and touch-control data.
Yet this kind time-sharing work (time sharing) mode is along with the resolution of display panel is increasingly high, and the pixel of the required promotion of display driving integrated circuit is also more and more, and the time that therefore needs is also more and more longer.But because display frame turnover rate (display frame rate) must maintain more than the 60Hz; Just each frame all has only 16.6 milliseconds; Yet, in 16.6 milliseconds, to carry out video picture and touch-control sensing, also more and more difficult because the resolution of display panel is increasingly high; Also limit the lifting of image resolution, existing the problem that touch-control display panel resolution can't promote in the known techniques.Therefore, the real space that still has improvement of the embedded multi-point touch display panels of convention system.
Summary of the invention
The invention provides a kind of embedded multi-point touch panel system; To solve the problem that display panel resolution can't promote in the known techniques; Need not to change the read clock of existing display panel simultaneously; And can let the common electrode layer (Vcom) in the display panels still can share with one deck transparent conductive body with the driving in the touch-control sensor, to save cost.
The technological means that the present invention adopts is following: a kind of embedded multi-point touch display panels system comprises:
Touch control LCD (Liquid Crystal Display) panel, it has:
Tft layer, it has K bar gate driving line and L bar source drive line, according to display pixel signal and display drive signals, in order to driving corresponding transistor and electric capacity, and then carries out display operation, and wherein, K, L are positive integer;
The induction electrode layer, whether it has M bar first conductor lines, according to the touch-control drive signal, have external object approaching in order to induction, and wherein, M is a positive integer; And
Common electrode and touch-control Drive Layer, it has N bar second conductor lines, when being used to carry out said display operation; Accept common voltage, and when carrying out touch-control sensing, accept said touch-control drive signal; Wherein, N is a positive integer, and K is greater than N; Said M bar first conductor lines and L bar source drive line are positioned at first direction, and said K bar gate driving line and N bar second conductor lines are positioned at second direction; And
Touch-control shows RACS; Be connected to said tft layer, induction electrode layer, common electrode and touch-control Drive Layer; Be used for supplying in regular turn said display drive signals to said K bar gate driving line,, and supply said display pixel signal to said L bar source drive line with said transistor unlatching with correspondence; And then carry out said display operation; And said touch-control shows that RACS is used to supply said touch-control drive signal to said N bar second conductor lines, and by said M bar first conductor lines sampling induced voltage, with detecting whether have external object near;
Said K bar gate driving line is divided into the N group; Each group gate driving line corresponds to one second conductor lines respectively; When one group of gate driving line receives said display drive signals; Its corresponding said second conductor lines then is connected to said common voltage, and when said touch-control showed that the RACS desire is supplied said touch-control drive signal to the i bar second conductor lines, said touch-control showed RACS judges earlier with the time whether said display drive signals to the i group of supply gate driving line is arranged; If not, said touch-control demonstration RACS is supplied said touch-control drive signal to the i bar second conductor lines.
Adopt embedded multi-point touch display panels provided by the invention system; Except can touch control sensing circuit being integrated in the display panels of convention; Simultaneously; Can common electrode layer (Vcom) in the display panels and the driving in the touch-control sensor be shared with one deck transparent conductive body, and then save cost.And, the present invention see through different drive clock simultaneously driving liquid crystal with carry out touch-control sensing, can also solve fully and show in the known techniques and the touch-control sensing timesharing drives the problem of back deficiency of time, and then can not hinder display panel resolution and promote.
Description of drawings
Fig. 1 is the synoptic diagram of convention self-induction capacitance sensing;
Fig. 2 is the synoptic diagram of convention mutual induction capacitance sensing;
Fig. 3 A to Fig. 3 D is the configuration diagram of the embedded multi-point touch panel of convention;
Fig. 4 A to Fig. 4 D is the clock synoptic diagram of the embedded multi-point touch panel of convention;
Fig. 5 is the calcspar of the embedded multi-point touch display panels of the present invention system;
Fig. 6 carries out the clock figure of video picture and touch-control sensing one embodiment simultaneously for touch-control of the present invention shows RACS;
Fig. 7 carries out the clock figure of video picture and another embodiment of touch-control sensing simultaneously for touch-control of the present invention shows RACS;
Fig. 8 carries out the clock figure of video picture and the another embodiment of touch-control sensing simultaneously for touch-control of the present invention shows RACS;
Fig. 9 carries out the clock figure of video picture and the another embodiment of touch-control sensing simultaneously for touch-control of the present invention shows RACS;
Figure 10 carries out the differential ference spiral structural drawing of touch detection to the touch-control drive signal for Fig. 9 embodiment;
Figure 11 carries out the differential ference spiral processing procedure figure of touch detection to the touch-control drive signal for Fig. 9 embodiment;
Figure 12 moves on to expansion DC-VCOM more than with the string wave voltage on whole for Fig. 9 embodiment;
Figure 13 changes the string ripple into for Fig. 9 embodiment the expansion of square wave;
Figure 14 changes the string ripple into square wave for Fig. 9 embodiment, and will export the expansion that accurate position all moves on to the DC-VCOM top;
Figure 15 is the detailed circuit diagram of the embedded multi-point touch display panels of the present invention system;
Figure 16 carries out the clock figure of video picture and touch-control sensing one embodiment simultaneously for this touch-control of the present invention shows RACS 520;
The explanation of primary clustering symbol unit:
Drive and sensor 110 driving and sensors 120
Following polarizing layer 310 lower glass substrate 320
Common electrode and touch-control Drive Layer 350
Polarizing layer 390 on the induction electrode layer 380
Embedded multi-point touch display panels system 500
Touch control LCD (Liquid Crystal Display) panel 510 touch-controls show RACS 520
Source electrode driving device 905 gate drive apparatus 910
Common voltage generation device 925 switching device shifters 930
But control device 935 gain-programmed amplifiers 940
Analog-to-digital converter 945 coordinate judgment means 950
Read clock controller 9351 touch-control clock controllers 9353;
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer; Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated, be to be understood that; Specific embodiment described herein only is used to explain the present invention, and is not used in qualification the present invention.
Fig. 5 is the calcspar of the embedded multi-point touch display panels of the present invention system 500, this embedded multi-point touch display panels system 500 comprise a touch control LCD (Liquid Crystal Display) panel 510, and a touch-control show RACS 520.
This touch control LCD (Liquid Crystal Display) panel 510 has a tft layer 330, an induction electrode layer 380, a common electrode and touch-control Drive Layer (Vcom) 350, and the tft layer 330 of this touch control LCD (Liquid Crystal Display) panel 510, common electrode and touch-control Drive Layer (Vcom) 350, and the permutation and combination of the storehouse mode of induction electrode layer 380 can be among Fig. 3 A to Fig. 3 D any.
This tft layer 330 have K bar gate driving line (G1, G2 ...; GK) and L bar source drive line (SOURCE 1, SOURCE2 ...; SOURCEL), in order to according to a display pixel signal and a display drive signals, come corresponding transistor and the electric capacity of pixel on the driving liquid crystal panel; To carry out display operation, wherein, K, L are positive integer.For the purpose of convenient explanation, in present embodiment, K is 800, and L is 600.
The driving component of this tft layer 330 is thin film transistor (TFT) (TFT) in present embodiment; In other embodiment, can be 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).
This induction electrode layer 380 have M bar first conductor lines (RX1, RX2 .., RXM), according to a touch-control drive signal, in order to respond to approaching external object, wherein, M is a positive integer, in 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 signal, wherein, N is a positive integer; And K is greater than N, and in 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) and be positioned at a first direction (Y), this K bar gate driving line (G1; G2 ..., GK) and this N bar second conductor lines (Vcom1; Vcom2 ..., VcomN) be positioned at a second direction (X).Wherein, this first direction and this second direction are orthogonal.
In present embodiment, this K bar gate driving line (G1, G2;, GK) with this N bar second conductor lines (Vcom1, Vcom2; ..., VcomN) have corresponding relation, that is gate driving line G1 to G40 corresponds to the second conductor lines Vcom1; Gate driving line G41 to G80 corresponds to the second conductor lines Vcom2, analogizes in regular turn.That is gate driving line G1 to G40 is first group, and gate driving line G41 to G80 is second group ..., gate driving line G761 to G800 is the 20 group.Illustrate further, first group of gate driving line G1 to G40 ties up to this tft layer 330, and the second corresponding conductor lines Vcom1 ties up to same position place in this common electrode and the touch-control Drive Layer (Vcom) 350, and other also is like this.,, do not need certain average packet here yet, only need K bar gate driving line be divided into the N group, set up corresponding relation and get final product even K is the integral multiple of N.
When K was not the integral multiple of N, for example, K was 802; N is 20 o'clock, and gate driving line G1 to G41 corresponds to the second conductor lines Vcom1, and gate driving line G42 to G82 corresponds to the second conductor lines Vcom2; Gate driving line G83 to G122 corresponds to the second conductor lines Vcom3, analogizes in regular turn.Certainly, also can K bar gate driving line be divided into N crowd, respectively corresponding N bar second conductor lines according to other modes.
This touch-control shows that RACS 520 is connected to this tft layer 330, this induction electrode layer 380, reaches this common electrode and touch-control Drive Layer (Vcom) 350, and this touch-control demonstration RACS 520 is supplied this display drive signals to this K (800) bar gate driving line in regular turn, in order to the transistor of correspondence is opened; And supply this display pixel signal to this L (600) bar source drive line, to carry out display operation, this touch-control demonstration RACS 520 is supplied this touch-control drive signal in regular turn to this N bar second conductor lines (Vcom1; Vcom2; ..., Vcom20), and by this M bar first conductor lines (RX1; RX2; .., RX12) whether the sampling induced voltage has external object approaching in order to detecting.
This K (800) bar gate driving line is divided into N (20) group; Each group gate driving line corresponds to one second conductor lines; When wherein one group of gate driving line received this display drive signals, this corresponding second conductor lines then was connected to this common voltage (Vcom), the ground connection when showing in order to conduct.
This touch-control of the present invention shows that the principle of work of RACS 520 is: when this touch-control shows RACS 520 this touch-control drive signal to the of supply i bars second conductor lines; This touch-control shows that RACS 520 judges whether to have simultaneously this display drive signals to the of supply i group gate driving line earlier; If not, this touch-control shows RACS 520 this touch-control drive signal to the of supply i bars second conductor lines.By this, realize video picture and touch-control sensing simultaneously.If change the order that the touch-control signal drives, for example: drive i+1 bar second conductor lines earlier.
Fig. 6 carries out the clock figure of an embodiment of video picture and touch-control sensing simultaneously for this touch-control of the present invention shows RACS 520.At first; When this touch-control shows 1 group of gate driving line of RACS 520 these display drive signals to the of supply; This touch-control shows that RACS 520 these common voltages of supply (Vcom) are to this N bar second conductor lines, to let this N bar second conductor lines be connected to this common voltage (Vcom).
When this touch-control showed RACS 520 this display drive signals to the of supply i group gate driving lines, this touch-control showed RACS 520 this touch-control drive signal to the of supply i-1 bars second conductor lines, wherein, and i=2 ~ N.
After this touch-control showed RACS 520 this display drive signals to the of supply N group gate driving lines, this touch-control showed RACS 520 this touch-control drive signal to the of supply N bars second conductor lines.
Among the clock figure of Fig. 6, the clock of display part need not to change fully, that is these touch-control demonstration RACS 520 supply display drive signals to K bar gate driving lines (G1, G2 ..., clock G800) is identical with the clock of original LCD panel.Can know by Fig. 6; After vertical synchronizing signal (Vsync) has been come; First group of gate driving line G1 to G40; Just the gate driving line G1 to G40 in the second conductor lines Vcom1 same position drives earlier in regular turn, and this moment, the second conductor lines Vcom1 did not change, and promptly this touch-control demonstration RACS 520 is not supplied this touch-control drive signal to this second conductor lines Vcom1.This touch-control shows second conductor lines of RACS 520 this common voltage of supply (Vcom) to the second conductor lines Vcom1 and other N-1 bars, to let this N bar second conductor lines be connected to this common voltage (Vcom).
Along with the gate driving line is driven to after the G40 in regular turn; This touch-control shows that RACS 520 begins to supply this touch-control drive signal to this second conductor lines Vcom1; And by this M bar first conductor lines (RX1, RX2 ..; RX12) whether the sampling induced voltage has this external object approaching in order to detect this second conductor lines Vcom1 zone.
After the gate driving line is driven to G80 in regular turn; This touch-control shows that RACS 520 begins to supply this touch-control drive signal to this second conductor lines Vcom2; And by this M bar first conductor lines (RX1, RX2 ..; RX12) whether the sampling induced voltage has external object approaching in order to detect this second conductor lines Vcom2 zone.Analogize in regular turn.
As shown in Figure 6, in regular turn demonstration in second conductor lines Vcom1 ~ Vcom20 zone and touch-control data are all finished, wherein can need not do timesharing fully because of carrying out touch detection or shorten driving time as the clock that shows.
Fig. 7 carries out the clock figure of video picture and another embodiment of touch-control sensing simultaneously for this touch-control of the present invention shows RACS 520.As shown in Figure 7, this touch-control shows that RACS 520 is according to supplying this display drive signals behind the Preset Time simultaneously to this N group gate driving line (G1, G2; ..., G800) and supply this touch-control drive signal to this N bar second conductor lines (Vcom1, Vcom2;, Vcom20).As shown in Figure 7; Afterwards through a VBP time (choosing according to using of this VBP time confirmed), supply 1 group of gate driving line to the of this display drive signals to the N in regular turn in this Preset Time (VBP is after the time) and organize the gate driving line by this touch-control demonstration RACS 520 in vertical synchronizing signal (Vsync) for this touch-control demonstration RACS 520.Simultaneously, this touch-control demonstration RACS 520 is supplied 2 second conductor lines to the N of this touch-control drive signal to the bar, second conductor lines in regular turn, is reached the 1st second conductor lines in this Preset Time (VBP is after the time).
Shown in Figure 7 is the control clock of another kind of same concept; Required time of one second conductor lines Vcom1 of its hypothesis driven is less than driving a group gate driving required time of line G1 to G40; Therefore; When vertical synchronizing signal (Vsync) later; This touch-control shows that RACS 520 drives first group of gate driving line G1 to G40 earlier in regular turn, and wherein, this first group of gate driving line G1 to G40 is identical in the position of this common electrode and touch-control Drive Layer (Vcom) 350 with this second conductor lines Vcom1 in the position of this tft layer 330.This touch-control shows when RACS 520 drives first crowd of gate driving line G1 to G40 earlier in regular turn; This touch-control shows RACS 520 this touch-control drive signal to the second conductor lines of supply Vcom2; And supply this touch-control drive signal to the second conductor lines Vcom3, Vcom4 in regular turn ..., Vcom20; Supply this touch-control drive signal to the second conductor lines Vcom1 at last, and then the touch-control of accomplishing a whole touch-control picture scans program.
Illustrate further, adopt driving method of the present invention, when only needing to confirm this touch-control drive signal to the second conductor lines of supply Vcom1, these touch-control demonstration RACS 520 these display drive signals of supply after G40, just do not have problem.
Simultaneously, please note the frequency that scans that frequency not necessarily will equal display line that scans of touch-control line.Touch Screen scan the frequency that scans that frequency also not necessarily will equal display screen.The beginning of Touch Screen scans the time and also not necessarily will show time synchronized with display screen beginning.In addition, the driving frequency of touch-control drive signal on second wire body (Vcom), also do not need identical with the display line sweep frequency, for instance, when the renewal frequency of display screen is 60Hz, the scanning frequency and can not be subject to 60Hz of Touch Screen.
Fig. 8 carries out the clock figure of video picture and the another embodiment of touch-control sensing simultaneously for this touch-control of the present invention shows RACS 520.When this touch-control shows that RACS 520 non-(non-sequential) is in proper order supplied this touch-control drive signal to the i bar second conductor lines; This touch-control shows that RACS 520 judges whether to have simultaneously this display drive signals to the of supply i group gate driving line earlier; If have; This touch-control shows that RACS 520 these touch-control drive signals of supply are to other second conductor lines except i bar second conductor lines; If do not have, this touch-control shows that RACS 520 these touch-control drive signals of supply are to this i bar second conductor lines.As shown in Figure 8, this touch-control demonstration RACS 520 non-(non-sequential) in proper order supplies this touch-control drive signal to the i bar second conductor lines.
Fig. 9 carries out the clock figure of the another embodiment of developing device touch-control sensing simultaneously for touch-control of the present invention shows RACS 520.When this touch-control showed that RACS 520 is supplied plural touch-control drive signal to the i bar second conductor lines simultaneously, just there were most VCOM the same time simultaneously as the touch-control drive end.These touch-control drive signals, the summation convergence 0 of the coupling electric weight of counter plate can effectively reduce the interference of other shows signal on the counter plate at one time, and the enlargement factor that increases back end signal.Referring to Fig. 9, use the string ripple to drive simultaneously with two touch-control drive signals and be example, can find a pair of in twos driving simultaneously; Its amplitude, frequency are identical, phase phasic difference 180 degree, so the coupling effect of other signal on the counter plate; Just can offset, and then significantly alleviate the interference of touching signals other signals.Utilize algorithm (the Demodulate Method Of Differential Sensing Capacitive Touch of previous patent US2012/0050217 again; Like Figure 10 and Figure 11; Specific practice is referring to US2012/0050217; Repeat no more here), can smoothly data demodulates be come out, accomplish touch detection.
Drive second conductor lines simultaneously based on plural touch-control drive signal; And eliminate coupling effect and disturb display system; Following advantage is arranged: the touch-control drive signal is disturbed the demonstration of display panels hardly, can accomplish touch-control simultaneously with display driver and drive, and does not take the demonstration time; The touch-control drive signal is not subject to shows signal, can adjust frequency arbitrarily, with the neighbourhood noise of dodging; More single touch-control drive signal, touch-control drive signal can be used bigger amplitude and not disturb the demonstration of display panel, that is SNR can be significantly improved.
Figure 12 is the expansion of Fig. 9, just the string wave voltage is moved on to more than the DC-VCOM on whole.This kind waveform is easier to realize in reality, and can have much impact to usefulness.
Figure 13 is the expansion of Fig. 9, just changes the string ripple into square wave.Square wave is realized than the string ripple easily.
Figure 14 is the expansion of Fig. 9, just changes the string ripple into square wave, and will export accurate position and all move on to the DC-VCOM top.
Figure 15 is the detailed circuit diagram of the embedded multi-point touch display panels of the present invention system 500, comprises the common device for generating voltage of one source pole drive unit 905, a gate drive apparatus 910, a sensing apparatus 915, a touch-control drive signal generation device 920, one 925, a switching device shifter 930, a control device 935, one group of gain-programmed amplifier 940, one group of analog-to-digital converter 945, reaches a coordinate judgment means 950 but this touch-control shows RACS 520.
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 the signal of this touch control LCD (Liquid Crystal Display) panel 510 of sensing.
This touch-control drive signal generation device 920; In order to produce this touch-control drive signal VIN; Wherein, this touch-control drive signal generation device 920 can produce self-induction electric capacity (selfcapacitance) detection technology or the required touch-control drive signal VIN of mutual induction electric capacity (mutual capacitance) 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 signal generation device 920, reaches this common voltage generation device 925.
This control device 935 comprises a read clock controller 9351, an and touch-control clock controller 9353.But 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 signal generation device 920, reaches this switching device shifter 930, this group of gain-programmed amplifier 940, this group of analog-to-digital converter 945, reaches this coordinate judgment means 950; In order to set this switching device shifter 930; So that this touch-control drive signal or this common voltage (Vcom) are provided to this N bar second conductor lines; Set this gate drive apparatus 910 and export this display drive signals in regular turn, and set these source electrode driving device 905 these display pixel signals of output to this L bar source drive line to this K bar gate driving line.
This read clock controller 9351 is connected to this source electrode driving device 905, this gate drive apparatus 910, reaches this common voltage generation device 925; In order to supply the clock of this source electrode driving device 905 and this gate drive apparatus 910 these display pixel signals of output and this display drive signals, reach the clock that this common voltage generation device of control 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 signal generation device 920, reaches this switching device shifter 930; In order to set this switching device shifter 930, so that this touch-control drive signal or this common voltage (Vcom) are provided to this N bar second conductor lines.
But this group of gain-programmed amplifier 940 is connected to this sensing apparatus 915, in order to this M detection signal is amplified, and then produces M amplification detection signal.
But this group of analog-to-digital converter 945 is connected to this group of gain-programmed amplifier 940, converts M digital detection signal in order to amplify detection signal with this M.
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 approaching external object.
This M bar first conductor lines and this N bar second conductor lines have stray capacitance and stray capacitance respectively, between this M bar first conductor lines and this N bar second conductor lines mutually repeatedly the place form respectively Inductance and Capacitance mutual induction electric capacity (mutual capacitance, Cm).First conductor lines (RX1, RX2 .., RX12) and second conductor lines (Vcom1, Vcom2 ..., the ground capacitance of each the strip conductor line in Vcom20) is self-induction electric capacity (Cs).
Have M sensing circuit in this sensing apparatus 915, in order to detecting aforementioned Inductance and Capacitance, and then produce a corresponding M detection signal.
Each sensing circuit of this sensing apparatus 915 forms 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 shows that for this touch-control of the present invention RACS 520 shows simultaneously and the clock figure of touch-control sensing one embodiment.It exchanges common voltage (AC-Vcom) with the main difference of Fig. 7 for this common voltage generation device 925 produces; That is this touch-control shows when RACS 520 is supplied 1 group of gate driving line G1 of this display drive signals to the ~ G40 in regular turn; In the same time; This common voltage generation device 925 produces interchange common voltage (AC-Vcom) and gives corresponding this second conductor lines Vcom1, and this second conductor lines Vcom1 goes up and is interchange common voltage (AC-Vcom), but not this touch-control drive signal.At this moment, this touch-control shows this touch-control drive signal to the second conductor lines of 520 supplies of RACS Vcom2.
Can know that by above stated specification the present invention be except being integrated into touch control sensing circuit in the display panels of convention, simultaneously, and common electrode layer (Vcom) in the display panels and the driving in the touch-control sensor shared same one deck, and then save cost.Compared to known techniques; In order to will show and touch-control sensing employing time-sharing work; But not the common electrode layer (Vcom) of the present invention in display panels still can be shared with one deck transparent conductive body with the driving of touch-control sensing; Illustrate further, the present invention see through different drive clock simultaneously driving liquid crystal with carry out touch-control sensing, can also solve fully that known techniques shows and the touch-control sensing timesharing drives the problem of back deficiency of time.
The embodiment one that United States Patent (USP) discloses case US 2012/0050217 in early days uses the method for timesharing that touch-control sensing is dispersed in each bar display line; And embodiment two uses the method for timesharing to disperse each to show in the picture frame (frame) touch-control sensing, therefore can sacrifice the setting time (Settling time) of video data and touch-control data.Embodiment three utilizes common electrode layer (Vcom) the bifurcation thixotroping (toggle) that shows as triggering in addition; To carry out touch detection; Though be to show with touch-control to carry out simultaneously equally; But share the common electrode layer (Vcom) that shows is the signal of touch-control, but touch detection can be subject to the clock of demonstration, therefore can't select suitable touch detection frequency.
Given this, but the advantage of knowledge capital invention is following:
1. can prolong with on original framework, the common electrode layer (Vcom) in the display panels still can be shared with one deck transparent conductive body with the driving in the touch-control sensor, in order to save cost.
2. when display panels is driving, except the gate driving line that showing (G1, G2 ..., GK) outside pairing second conductor lines, have at least one can drive simultaneously in remaining second conductor lines in order to the detecting touch-control.That is the present invention can carry out in panel demonstration and touch detection simultaneously, and use signal (DC-Vcom, AC-Vcom, VIN) separately is at the second conductor lines (Vcom1 of different bars; Vcom2; ..., VcomN) get simultaneously, any panel shows and the time of touch detection so need not sacrifice.
The gate driving line of display panels (G1, G2 ...; GK) and the source drive line (SOURCE 1, and SOURCE 2 ... SOURCE L) clock needn't cooperate touch-control sensing and do change, fully by this touch-control clock controller via (for example: Vsync/Hsync) make computing, upgrading area relative second conductor lines (Vcom1 reading the display panels coherent signal in order to the display panels of dodging; Vcom2 ..., VcomN).
4. technology of the present invention, gate driving line (G1, the G2 that touching signals can be dodged automatically showing; ..., GK) pairing second conductor lines (Vcom1, Vcom2; ..., VcomN), with in order to avoid supply this common voltage (Vcom) and this touch-control drive signal simultaneously at same second conductor lines (Vcom1; Vcom2 ..., VcomN).So, the clock (display timing) of panel demonstration need not done any change.That is touch detection does not also need and the panel display synchronization, can realize easily being shown as 60Hz like panel, but touch detection is asynchronous situations such as 100Hz.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (15)
1. an embedded multi-point touch display panels system is characterized in that, comprising:
Touch control LCD (Liquid Crystal Display) panel, it has:
Tft layer, it has K bar gate driving line and L bar source drive line, according to display pixel signal and display drive signals, in order to driving corresponding transistor and electric capacity, and then carries out display operation, and wherein, K, L are positive integer;
The induction electrode layer, whether it has M bar first conductor lines, according to the touch-control drive signal, have external object approaching in order to induction, and wherein, M is a positive integer; And
Common electrode and touch-control Drive Layer, it has N bar second conductor lines, when being used to carry out said display operation; Accept common voltage, and when carrying out touch-control sensing, accept said touch-control drive signal; Wherein, N is a positive integer, and K is greater than N; Said M bar first conductor lines and L bar source drive line are positioned at first direction, and said K bar gate driving line and N bar second conductor lines are positioned at second direction; And
Touch-control shows RACS; Be connected to said tft layer, induction electrode layer, common electrode and touch-control Drive Layer; Be used for supplying in regular turn said display drive signals to said K bar gate driving line,, and supply said display pixel signal to said L bar source drive line with said transistor unlatching with correspondence; And then carry out said display operation; And said touch-control shows that RACS is used to supply said touch-control drive signal to said N bar second conductor lines, and by said M bar first conductor lines sampling induced voltage, with detecting whether have external object near;
Said K bar gate driving line is divided into the N group; Each group gate driving line corresponds to one second conductor lines respectively; When one group of gate driving line receives said display drive signals; Its corresponding said second conductor lines then is connected to said common voltage, and when said touch-control showed that the RACS desire is supplied said touch-control drive signal to the i bar second conductor lines, said touch-control showed RACS judges earlier with the time whether said display drive signals to the i group of supply gate driving line is arranged; If not, said touch-control demonstration RACS is supplied said touch-control drive signal to the i bar second conductor lines.
2. embedded multi-point touch display panels according to claim 1 system; It is characterized in that; When said touch-control shows that RACS is supplied said display drive signals to the i group gate driving line; Said touch-control demonstration RACS is supplied said touch-control drive signal to the i-1 bar second conductor lines, in the middle of, i=2 ~ N.
3. embedded multi-point touch display panels according to claim 2 system; It is characterized in that; When said touch-control shows that RACS is supplied 1 group of gate driving line of said display drive signals to the; Said touch-control shows that RACS supplies said common voltage to said N bar second conductor lines, with so that said N bar second conductor lines is connected to said common voltage.
4. embedded multi-point touch display panels according to claim 3 system; It is characterized in that; After said touch-control showed this display drive signals to the of RACS supply N group gate driving line, said touch-control demonstration RACS was supplied said touch-control drive signal to the N bar second conductor lines.
5. embedded multi-point touch display panels according to claim 1 system; It is characterized in that; Said touch-control shows side by side supplies said display drive signals to said N group gate driving line and said touch-control drive signal to said N bar second conductor lines after RACS is according to Preset Time; Said touch-control demonstration RACS is supplied said display drive signals in regular turn in the 1st group of gate driving line to the N group gate driving line behind said Preset Time; Said touch-control demonstration RACS is supplied said touch-control drive signal in regular turn in the 2nd second conductor lines to the N bar second conductor lines behind said Preset Time, and the 1st second conductor lines.
6. embedded multi-point touch display panels according to claim 5 system is characterized in that, said touch-control shows that RACS is non-and supplies said touch-control drive signal to the i bar second conductor lines in proper order.
7. embedded multi-point touch display panels according to claim 5 system is characterized in that, said touch-control shows that RACS supplies a plurality of said touch-control drive signal to the i bar second conductor lines.
8. embedded multi-point touch display panels according to claim 7 system is characterized in that said a plurality of touch-control drive signals are two, and said two touch-control drive signal amplitude, frequency are identical, phase phasic difference 180 degree.
9. embedded multi-point touch display panels according to claim 8 system is characterized in that said touch-control drive signal is string ripple or square wave.
10. embedded multi-point touch display panels according to claim 6 system is characterized in that said touch-control shows that RACS comprises:
Source electrode driving device is connected to said touch control LCD (Liquid Crystal Display) panel, in order to drive said touch control LCD (Liquid Crystal Display) panel according to said display pixel signal;
Gate drive apparatus is connected to said touch control LCD (Liquid Crystal Display) panel, in order to producing said display drive signals, and then drives said touch control LCD (Liquid Crystal Display) panel;
Sensing apparatus is connected to said touch control LCD (Liquid Crystal Display) panel, in order to the signal of the said touch control LCD (Liquid Crystal Display) panel of sensing;
Touch-control drive signal generation device is in order to produce said touch-control drive signal;
The common voltage generation device is in order to produce said common voltage;
Switching device shifter is connected to said touch control LCD (Liquid Crystal Display) panel, said touch-control drive signal generation device, and said common voltage generation device; And
Control device; Be connected to said source electrode driving device, gate drive apparatus, common voltage generation device, sensing apparatus, touch-control drive signal generation device and switching device shifter; In order to set said switching device shifter; And then said touch-control drive signal or said common voltage provided to said N bar second conductor lines; Set said gate drive apparatus and export said display drive signals to said K bar gate driving line in regular turn, and set said source electrode driving device and export said display pixel signal to said L bar source drive line.
11. embedded multi-point touch display panels according to claim 10 system is characterized in that said control device comprises:
The read clock controller; Be connected to said source electrode driving device, gate drive apparatus and common voltage generation device; In order to supplying the clock that said source electrode driving device and said gate drive apparatus are exported said display pixel signal and said display drive signals, and said common voltage generation device produces the clock of said common voltage; And
The touch-control clock controller is connected to said read clock controller, sensing apparatus, touch-control drive signal generation device and switching device shifter, in order to set switching device shifter, so that said touch-control drive signal or said common voltage are provided to said N bar second conductor lines.
12. embedded multi-point touch display panels according to claim 11 system; It is characterized in that; Said M bar first conductor lines and said N bar second conductor lines have stray capacitance and stray capacitance respectively, between said M bar first conductor lines and said N bar second conductor lines mutually repeatedly the place form Inductance and Capacitance respectively.
13. embedded multi-point touch display panels according to claim 12 system is characterized in that said sensing apparatus has M sensing circuit, in order to detecting said Inductance and Capacitance, and then produces a corresponding M detection signal.
14. embedded multi-point touch display panels according to claim 13 system is characterized in that said touch-control shows that RACS more comprises:
But one group of gain-programmed amplifier is connected to said sensing apparatus, in order to a said M detection signal is amplified, and then produces M amplification detection signal;
One group of analog-to-digital converter, but be connected to said group of gain-programmed amplifier, convert M digital detection signal into to amplify detection signal with said M; And
The coordinate judgment means is connected to said one group of analog-to-digital converter device, according to said M digital detection signal, to judge the coordinate position of said approaching external object.
15. embedded multi-point touch display panels according to claim 14 system; It is characterized in that; A said M sensing circuit is made up of operational amplifier and back coupling electric capacity respectively; One end of said back coupling electric capacity is connected to the inverting input of said operational amplifier; The other end is connected to the output terminal of said operational amplifier, the inverting input of said operational amplifier be connected to said M bar first conductor lines one of them, the non-inverting input of said operational amplifier is connected to said common voltage.
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