CN201765574U - Touch control display capable of eliminating touch control influence on display - Google Patents
Touch control display capable of eliminating touch control influence on display Download PDFInfo
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- CN201765574U CN201765574U CN2009202055060U CN200920205506U CN201765574U CN 201765574 U CN201765574 U CN 201765574U CN 2009202055060 U CN2009202055060 U CN 2009202055060U CN 200920205506 U CN200920205506 U CN 200920205506U CN 201765574 U CN201765574 U CN 201765574U
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Abstract
The utility model discloses a touch control display capable of eliminating the touch control influence on the display. The touch control display comprises an active display screen, a display driving circuit, a touch control circuit and a display/touch control signal gating output circuit or a display/touch control signal loaded circuit; a row and column electrodes group is arranged on one substrate of the display screen; a common electrode is arranged on the other substrate of the display screen; a frame blanking time period exists between every two display scanning time periods of display screen electrodes; the display screen does not execute the display driving in the frame blanking time period and stops scanning row electrodes; column electrodes and a COM electrode keep the original output state or a certain preset output signal; part or all of an active devices on the display screen are in cut-off state; in the time period that the display screen electrodes transmit the touch control signal, the instant potential difference of the applied touch control signal among the electrodes leads the active devices on the display screen to keep cut-off state, so as to eliminate the influence of the touch control signal on the display.
Description
Technical field
The utility model relates to touch screen and flat-panel monitor, relates in particular to a kind of touch control display.
Background technology
The touch screen development has been widely used in various fields such as personal computer, smart phone, public information, intelligent appliance, Industry Control so far.In present touch-control field, mainly contain resistance type touch control screen, photo-electric touch screen, ultrasonic type touch screen, flat capacitance type touch screen, projected capacitive touch screen development in recent years is rapidly.But these touch screens all have technical disadvantages separately at present, though cause them widely to adopt at some special occasions, are difficult to apply on the common display screen.
Display screen and touch screen are to twin product, and in the prior art, display screen and touch screen are independently born separately and shown and the touch-control task usually.The flat-panel monitor with touch controllable function of present this discrete constitutes with parts such as display screen, display driver, touch screen, touching signals detecting device, backlights, touch screen has resistance-type, condenser type, electromagnetic type, ultrasonic type and the photo-electric etc. of using different sensing principles, and display screen has passive LCDs (TN/STN-LCD), active matrix liquid crystal display panel (TFT-LCD), organic light-emitting diode (OLED) display screen (OLED, AM-OLED), plasma display panel (PDP) (PDP), CNT display screen, Electronic Paper (e-paper) etc.The flat-panel monitor that has touch screen is that the touch screen of split and display screen is stacked together, detects the planimetric position of touch point by touch screen, makes the cursor on the display screen follow the location, touch point again.The stacked touch control type flat-panel display thickening that makes of touch screen and display screen becomes heavy cost increase; When touch screen placed the display screen front, the reflection that the touch screen sensing electrode produces can make that again demonstration is inhomogeneous and show decrease of contrast under strong ambient light environment, influences display effect.Trackpad and display screen being become one, make the flat-panel monitor with touch controllable function become more frivolous, is the direction that people make great efforts.
Find out a kind of scheme that solves above-mentioned complex structure problem, improve flat-panel monitor reliability, improve display effect, compressed thickness, reduce cost, realize that with succinct method the flat-panel monitor touch controllable function is necessary with touch controllable function.
Application number is 2006100948141, name is called " touch control type flat-panel display " and application number is 2006101065583, name is called the Chinese utility model patent instructions of " flat-panel monitor with touch controllable function ", disclosed the connected mode between a kind of touch-control detection circuit and the display screen electrode respectively, make both transmitting and displaying drive signals of display screen electrode by analog switch or loaded circuit, transmit again and the sensing touching signals, display driver and touch-control are surveyed time division multiplex or shared display screen electrode of while, the display screen electrode not only is used for display driver but also be used for the touch-control detection, thereby has proposed the notion of " touch control type flat-panel display " innovatively.
Application number is 2009102035358, name is called the Chinese utility model patent instructions of " a kind of driving of touch control type flat-panel display realizes ", application number is 2009101399060, name is called the Chinese utility model patent instructions of " a kind of driving of touch control type flat-panel display realizes ", application number is that 200810133417X, name are called the Chinese utility model patent instructions of " a kind of touch control type flat-panel display ", then again touch control type flat-panel display has been made further improvement.
The basic functional principle of this class touch control type flat-panel display that above-mentioned Chinese patent disclosed is, the electrode that utilizes two sets intersect on the display screen is as the touch-control sensing electrode, each strip electrode line of electrode group connects the touch-control driving source, and the touch-control driving source applies the touch-control pumping signal of interchange or direct current to electrode wires.When people's finger or other touch control objects came close to or in contact with certain strip electrode line, touch-control circuit was by surveying the size that each strip electrode line touching signals changes, thereby found out finger or the position of other touch control objects on display screen.This is the unite two into one touch-control Detection Techniques of formula of a kind of brand-new demonstration and touch-control, has significant cost advantage, has vast potential for future development after it is improved.
Summary of the invention
The purpose of this utility model provides a kind of touch control display, solves how to get rid of the influence problem of touching signals to showing.
For this reason, the touch control display that the utility model proposes comprises active display screen, display driver circuit, touch-control circuit, and makes the display screen electrode not only be used for display driver but also be used for demonstration/touching signals gating output circuit or the demonstration/touching signals loaded circuit that touch-control is surveyed; Described touch-control circuit has touch-control driving source and touching signals testing circuit; Described demonstration/touching signals gating output circuit makes the display screen electrode or is communicated with the transmitting and displaying drive signal with display driver circuit, or is communicated with the transmission touching signals with touch-control circuit, and display driver and touch-control are surveyed time division multiplex display screen electrode; Described demonstration/touching signals loaded circuit makes display screen electrode transmitting and displaying drive signal and touching signals simultaneously, and display driver and touch-control are surveyed shared display screen electrode simultaneously; On a plate base of display screen, have active device array and column electrode group that is connected active device array and row electrode group, on another plate base of display screen, have public electrode; In the time period the inside of display screen electrode transmitting display signal therefor, display driver circuit is to the scanning of the column electrode execution sequence on the display screen, and the row electrode on the display screen, COM electrode cooperate the corresponding shows signal of output; There is a frame blanking time period between per two reading scan time periods, this time period the inside display screen is not carried out display driver, scanning stops to column electrode, display driver circuit is all exported non-select signal to all column electrodes, row electrode, COM electrode keep original output state or certain default output signal, and display screen top or whole active devices are in cut-off state; In the period of display screen electrode transmission touching signals, the transient potential that the touching signals that is applied is had between each electrode is poor, makes the active device remain off state on the display screen, gets rid of the influence of touching signals to showing.
Further, in preferred embodiment of the present utility model:
The described active device on display screen top that makes is in cut-off state, is to instigate the active device remain off state that directly is connected with display pixel on the display screen.
The influence of described eliminating touching signals to showing is that the transient potential of the touching signals that applies on the column electrode group that connects active device array and each strip electrode line of row electrode group is poor, makes active device remain off state whole or part on the display screen.
The influence of described eliminating touching signals to showing, the transient potential that is the touching signals that applies on column electrode group that connects active device array or the partial electrode line in the row electrode group and on the public electrode is poor, makes the active device remain off state that connects this partial electrode line.
Active device array on the described display screen substrate is a tft array, the grid that the row-column electrode line connects TFT respectively is with source electrode or be connected grid and the drain electrode of TFT respectively, the transient potential of the touching signals that applies is poor on the column electrode group that connects tft array and each strip electrode line of row electrode group, makes TFT remain off state whole or part on the display screen.
Active device array on the described display screen substrate is a tft array, the grid that the row-column electrode line connects TFT respectively is with source electrode or be connected grid and the drain electrode of TFT respectively, in row electrode lines or row electrode wires, connect on the electrode wires of TFT grid and on the public electrode transient potential of the touching signals that applies poor, make whole or active device remain off state partly on the display screen.
Touching signals relation between described each electrode that applies touching signals is to keep the mean value of potential difference (PD) between these electrodes constant, makes display effect that appreciable variation not take place.
In a period of display screen electrode transmission touching signals, the potential difference (PD) of touching signals has the period that keeps constant between the different electrode groups.
Intersegmental when each of display screen electrode transmission touching signals, the potential difference (PD) of touching signals remains unchanged between the different electrode groups.
Described on the row-column electrode group or the touching signals that applies on the public electrode, be the mixed signal of AC signal or AC signal and direct current signal.
The waveform of the AC signal composition in the described touching signals is a kind of in the AC wave shape such as square wave, sine wave, triangular wave, sawtooth wave.
The frequency of the AC signal composition in the described touching signals is at 10kHz or more than the 10kHz.
Described active display screen is a kind of in Thin Film Transistor-LCD (TFT-LCD) or other active matrix liquid crystal display panels, active organic LED display screen, the active CNT display screen.
The beneficial effect that the utility model is compared with the prior art is:
The technical scheme that the utility model disclosed is by selecting rational touch-control pumping signal scheme, guaranteed that under the touch-control acquisition mode TFT is in cut-off state, allow display effect not be subjected to the influence of touch-control pumping signal, at least this influence is controlled to negligible degree, effectively realized the time division multiplex of display screen electrode.
Description of drawings
Accompanying drawing 2 is structural representations of the demonstration sub-pixel of a kind of TFT-LCD;
Accompanying drawing 3 is sequential charts of the conventional display driver of a kind of TFT-LCD LCDs;
Accompanying drawing 4 is structural drawing of a kind of touch control display of TFT-LCD display screen;
Accompanying drawing 5 is sequential charts of a kind of time division multiplex display screen electrode;
Accompanying drawing 6 is touch-control excitation signal waveforms figure of embodiment one;
Accompanying drawing 7 is touch-control excitation signal waveforms figure of embodiment two;
Accompanying drawing 8 is touch-control excitation signal waveforms figure of embodiment three;
Accompanying drawing 9 is touch-control excitation signal waveforms figure of embodiment four;
Accompanying drawing 10 is touch-control excitation signal waveforms figure of embodiment five;
Accompanying drawing 11 is touch-control excitation signal waveforms figure of embodiment six;
Accompanying drawing 12 is sequential charts of the time division multiplex display screen electrode of embodiment seven, mode eight;
Accompanying drawing 13 is touch-control excitation signal waveforms figure of embodiment seven, mode eight;
Accompanying drawing 14 is positivity liquid crystal material molecules figure that put in order after the match outside;
Accompanying drawing 15 is negative liquid crystal material molecule figure that put in order after the match outside;
Accompanying drawing 16 is time division multiplex display screen electrode sequential charts of embodiment nine;
Accompanying drawing 17 is time division multiplex display screen electrode sequential charts of embodiment ten;
Equivalent circuit diagram when accompanying drawing 18 is the finger touch display screen;
Accompanying drawing 19 is to touch the touching signals leakage current Δ i the produced curve map with frequency change;
Accompanying drawing 20 is that the COM electrode is arranged on upper substrate when on glass, the equivalent circuit diagram during the finger touch display screen;
Accompanying drawing 21 is touch-control pumping signals when being square wave, the touching signals oscillogram of touch-control driving source and touching signals sampled point;
Accompanying drawing 22a, 22b, 22c are touch-control pumping signals when being square wave, the complete synchronizing process synoptic diagram that touch-control is surveyed;
Accompanying drawing 23 is touch-control pumping signals when sinusoidal wave, the touching signals oscillogram of touch-control driving source and touching signals sampled point;
Accompanying drawing 24a, 24b, 24c are the touch-control pumping signals when sinusoidal wave, the complete synchronizing process synoptic diagram that touch-control is surveyed;
Accompanying drawing 25 is touching signals testing circuit structural drawing of a kind of instantaneous method of measuring;
Accompanying drawing 26 is touching signals testing circuit structural drawing of a kind of instantaneous method of measuring;
Accompanying drawing 27 is touching signals testing circuit structural drawing of a kind of instantaneous method of measuring;
Accompanying drawing 28 is touching signals testing circuit structural drawing of a kind of effective value mensuration;
Accompanying drawing 29 is touching signals testing circuit structural drawing of a kind of effective value mensuration;
Accompanying drawing 30 is touching signals testing circuit structural drawing of a kind of effective value mensuration;
Accompanying drawing 31 is that the touch-control pumping signal is a square wave, the temporal characteristics of touching signals sampled point touching signals;
Accompanying drawing 32 is touching signals testing circuit structural drawing of a kind of temporal characteristics mensuration;
Accompanying drawing 33 is touching signals testing circuit structural drawing of a kind of temporal characteristics mensuration;
Accompanying drawing 34 is touching signals testing circuit structural drawing of a kind of phase-shift measurement method;
Accompanying drawing 35 is touching signals testing circuit structural drawing of a kind of phase-shift measurement method;
Accompanying drawing 36 is that a kind of touch control detection mode of single channel sequential scanning detects sequential schematic;
Accompanying drawing 37 is that a kind of touch control detection mode of single channel interval scan detects sequential schematic;
Accompanying drawing 38 is that the touch control detection mode that a kind of single channel coarse scan refinement is swept detects sequential schematic;
Accompanying drawing 39 is that a kind of touch control detection mode of hyperchannel sequential scanning detects sequential schematic;
Accompanying drawing 40 is that a kind of touch control detection mode of hyperchannel interval scan detects sequential schematic;
Accompanying drawing 41 is that the touch control detection mode that a kind of hyperchannel coarse scan refinement is swept detects sequential schematic.
Embodiment
The utility model is applicable to and comprises LCDs (LCD), organic light-emitting diode (OLED) display screen (OLED, AM OLED), plasma display panel (PDP) (PDP), CNT display screen, the Electronic Paper flat-panel monitors such as (e-paper) with column electrode and row electrode.
The content of this instructions is represented the Thin Film Transistor (TFT) LCD with the typical case of active-matrix liquid crystal display, and (ThinFilm Transistor LCD TFT-LCD) sets forth for object.
The Thin Film Transistor (TFT) LCDs is the typical case representative of active matrix liquid crystal display (AM LCD), it with the Thin Film Transistor (TFT) on the substrate (TFT) as switching device.The typical structure of TFT-LCD display is as shown in Figure 1: the 110th, and the TFT liquid crystal display; The 120th, liquid crystal display horizontal direction scan line electrode, 121,122 ..., 12m-1,12m be scanning electrode wire (row electrode lines); The 130th, liquid crystal display vertical orientation data row electrode, 131 ..., 13n is data electrode wire (row electrode wires); The 140th, public electrode (COM electrode), the current potential that public electrode connects are the reference potentials as liquid crystal display pixel; The 150th, the thin film transistor (TFT) TFT on the liquid crystal display, its grid (Gate) is connected to the horizontal direction sweep trace, and source electrode (Source) is connected to the data line of vertical direction, and drain electrode (Drain) then is connected to the display pixel electrode; The 160th, the liquid crystal molecule box of display pixel correspondence is equivalent to an electric capacity on electric, and this electric capacity is commonly defined as CLC; The 170th, (Capacitance Storage Cs), is used for storing the information of display pixel to memory capacitance; The 180th, public electrode reference voltage (Vcom Reference) is responsible for producing in the public electrode voltages source; The 181st, the gate electrode of TFT-LCD (column electrode) driver (Gate Driver) is used for driving the horizontal direction sweep trace; The 182nd, the source electrode of TFT-LCD (row electrode) driver (Source Driver) is used for driving the vertical orientation data line; The 183rd, time schedule controller (Timing Controller) is responsible for receiving RGB data, clock signal C lock, horizontal synchronization Hsync and the vertical synchronizing signal Vsync from the signal of video signal process chip, and, be used to control source electrode (row electrode) driver (Source Driver) and grid (column electrode) driver (Gate Driver) collaborative work with these conversion of signals.
A display pixel generally is made up of three sub-pixels that show three kinds of primary colors of red, green, blue.A structural representation that shows sub-pixel is as shown in Figure 2: Gi represents horizontal direction line scanning electrode wires, is also referred to as capable drive electrode line or grid drive electrode line, and the current potential on the Gi is Vg; Sj represents vertical direction column data electrode wires, is also referred to as row drive electrode line or source drive electrode line, and the current potential on the Sj is Vs; On behalf of TFT, Dij connect the terminal of display pixel, is called drain electrode, and the current potential on the Dij is Vd, is also referred to as the pixel current potential; Each display pixel all disposes field effect transistor (TFT) on the semiconductor switch device-film substrate, can directly control gating by pulse and carry out reading scan, thereby each pixel is relatively independent.Voltage between the grid of TFT (Gate) and source electrode (Source) is Vgs, and the voltage between the grid of TFT (Gate) and drain electrode (Drain) is Vgd.Thin Film Transistor (TFT) (TFT) has two kinds of nmos type and pmos types.Employed Thin Film Transistor (TFT) among most at present TFT-LCD, be to adopt amorphous silicon (amorphous silicon, a-Si) processing procedure, its gate insulator is silicon nitride (SiNx), seize positive charge easily, to in amorphous silicon semiconductor layer, form raceway groove, utilize the positive charge in the silicon nitride to help attract electronics just, therefore use the TFT of amorphous silicon processing procedure mostly to be nmos type to form raceway groove.The content of this instructions mainly is to be that representative is set forth with the nmos type Thin Film Transistor (TFT), and the pmos type Thin Film Transistor (TFT) can be followed the principle that communicates, and enumerates statement no longer separately.
The sequential of the conventional display driver of TFT-LCD LCDs is as shown in Figure 3: in reading scan time period (DisplayTime) the inside, scanning shows display driver circuit to the column electrode execution sequence, row electrode, COM electrode cooperate the corresponding shows signal of output, allow display screen be in show state; Have a frame blanking time period (Vertical Blanking Time) between per two reading scan time periods, this time period the inside display screen is not carried out display driver, scanning stops display driver circuit to column electrode, all column electrodes are all exported the non-select signal of TFT, row electrode, COM electrode keep original output state or certain default output signal, and TFT is in cut-off state.Time division multiplex display screen electrode technology scheme in the utility model is exactly to utilize this frame blanking time period as the time period of multiplexing display screen electrode for detecting electrode.
A kind of touch-control circuit is by control display driver circuit and touch-control circuit collaborative work, allow display screen electrode or be communicated with the transmitting and displaying drive signal with display driver circuit or be communicated with the transmission touching signals with touch-control circuit, display driver and touch-control are surveyed time division multiplex display screen electrode.At display time interval, the display screen electrode is communicated with display driver circuit transmitting and displaying drive signal, and display screen is in the demonstration attitude.Survey the period at touch-control, the display screen electrode is communicated with touch-control circuit transmission touching signals, and detect the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively, change with touching signals and reach certain row electrode lines that imposes a condition and the row electrode wires is the polar curve that gets an electric shock.By the point of crossing that the quilt that detects touches row electrode lines and touched the row electrode wires, determine by contact position.
The cited embodiment 16 of the utility model embodiment has disclosed relevant touching signals testing circuit structure to mode 19.
In addition, the cited embodiment one of the utility model embodiment is by selecting rational touch-control pumping signal scheme to mode six, to avoid the touch-control pumping signal to influence the example of display effect, embodiment seven has proposed to avoid showing several solutions that influence touch-control to mode ten, embodiment 11 has disclosed the selection requirement of touch-control exciting signal frequency to mode 13, when embodiment 14 and mode 15 have disclosed the touch-control detection, touching signals is detected synchronized relation with the touch-control pumping signal that applied, and embodiment 20 has disclosed multiple single channel and multichannel touch control detection scan mode and in proper order to mode 23.These embodiment are the improvement to all the other aspects of touch-control circuit, and whether it adopts the realization that does not influence technical solutions of the utility model, do not influence protection domain of the present utility model.
With TFT-LCD be display screen touch control display 400 electric connecting relation as shown in Figure 4.Comprise TFT-LCD display screen 410; The scan line electrode 420 of TFT-LCD display screen horizontal direction, have row electrode lines 421 ..., 42m; The data rows electrode 430 of TFT-LCD display screen vertical direction, have row electrode wires 431 ..., 43n; The common electrode layer of TFT-LCD display screen (COM electrode) 440; Thin Film Transistor (TFT) TFT 450 on the TFT-LCD display screen, its grid (Gate) is connected to horizontal direction scan line electrode wires, and source electrode (Source) is connected to the data rows electrode wires of vertical direction, and drain electrode (Drain) then is connected to pixel electrode; The liquid crystal cell 460 of display pixel correspondence is equivalent to an electric capacity on electric, this electric capacity is commonly defined as C
LCMemory capacitance (Capacitance Storage, Cs) 470, be used for the display message of storage pixel; The display driver circuit 480 of COM electrode is used for the touch-control driving source 481 of COM electrode, the COM signal gating output circuit 482 of COM electrode during the touch-control acquisition mode; The reading scan driving circuit 483 of column electrode, the touch-control circuit of column electrode (having touch-control driving source and touching signals testing circuit) 484, the capable signal gating output circuit 485 of column electrode; The video data driving circuit 486 of row electrode, the touch-control circuit of row electrode (having touch-control driving source and touching signals testing circuit) 487, the column signal gating output circuit 488 of row electrode; Time schedule controller (Timing Controller) 489 etc.Reading scan driving circuit 483 is connected to column electrode 420 with touch-control circuit 484 by row signal gating output circuit 485; Video data driving circuit 486 is connected to row electrode 430 with touch-control circuit 487 by column signal gating output circuit 488; COM display driver circuit 480 is connected to COM electrode 440 with touch-control driving source 481 by COM signal gating output circuit 482.
At display time interval, capable gating circuit 485, column selection circuit passband 488 and COM signal gating output circuit 482 in the touch control display 400 make display screen line electrode 420, row electrode 430 and COM electrode 440, be communicated with row display driver circuit 483, row display driver circuit 486 and COM display driver circuit 480 transmitting and displaying drive signals respectively, display screen 410 is in the demonstration attitude.
Survey the period at touch-control, capable gating circuit 485, column selection circuit passband 488 and COM signal gating output circuit 482 in the touch control display 400 make display screen line electrode 420, row electrode 430 and COM electrode 440, be communicated with row touch-control circuit 484, row touch-control circuit 487 and COM touch-control driving source 481 transmission touching signals respectively, and detecting the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively, display screen ranks electrode switches and uses as the touch-control sensing electrode; Detect the touching signals of flowing through and change and reach certain row electrode lines that imposes a condition and the row electrode wires is the polar curve that gets an electric shock to go touch-control circuit 484 and row touch-control circuit 487.By the point of crossing that the quilt that detects touches row electrode lines and touched the row electrode wires, determine the position of touch point on display screen 410.
What Fig. 4 illustrated is the structure of typical touch control display, and the explanation to embodiment all is based upon on the basis of this structure below.
Embodiment one
The touch-control driving source is the square-wave signal source that the direct current floors is arranged or do not have the direct current floors.When touch-control was surveyed, to the Gi of TFT as shown in Figure 2, Sj, three electrodes of COM applied touch-control pumping signal as shown in Figure 6 respectively, and three touch-control pumping signals of this that is applied all are the square waves that the direct current floors is arranged or do not have the direct current floors, and its frequency is identical and phase place is consistent.When show state switches to the touch-control acquisition mode, at first allow the transient potential difference Vgs=Vg-Vs of touch-control pumping signal that electrode Gi and electrode Sj are applied be lower than the cut-off voltage that allows TFT be in cut-off state at the display screen electrode; Allow and then COM electrode and electrode Gi are applied suitable touch-control pumping signal, the mean value of pixel electrode current potential Vd and COM electrode potential Vcom is all remained unchanged, and the transient potential difference that makes pixel current potential Vd meet Vgd=Vg-Vd all is lower than this requirement of cut-off voltage that allows TFT be in cut-off state, guarantee that Vgs and Vgd all are lower than the cut-off voltage that allows TFT be in cut-off state, thereby having guaranteed that TFT can remain valid under the touch-control acquisition mode ends, and kept the voltage of display pixel, the influence that allows display effect not surveyed by touch-control.
The touch-control driving source is chosen as the direct current floors or does not have the square-wave signal source of direct current floors, and the frequency of these square-wave signal sources is consistent with phase place, the amplitude of saltus step is also consistent, make the Gi of TFT, Sj, the difference of the pumping signal that three electrodes of COM apply is that constant DC is flat, in fact can adopt the testing circuit of features simple structure just can obtain good detection effect during touch control detection, and the generation of signal source is very convenient, and higher utility is arranged.
Embodiment two
Present embodiment is with the different of embodiment one: the frequency of three touch-control pumping signals of this that is applied (as shown in Figure 7) is inequality.
Embodiment three
Present embodiment is with embodiment one and the different of embodiment two: three touch-control pumping signals of this that executed all are the square waves that the direct current floors is arranged or do not have the direct current floors, and its frequency is identical but phase place is inconsistent, as shown in Figure 8.
Embodiment four
Different is for present embodiment and embodiment one to embodiment three: when touch-control is surveyed, the Gi of TFT as shown in Figure 2, Sj, three electrodes of COM apply touch-control pumping signal as shown in Figure 9 respectively, three touch-control pumping signals that applied all are the sine waves (noticing that embodiment one to three is the square wave non-sinusoidal wave) that the direct current floors is arranged or do not have the direct current floors, and its frequency is identical consistent with phase place.
Embodiment five
Different is for present embodiment and embodiment one to embodiment four, when touch-control is surveyed, the Gi of TFT as shown in Figure 2, Sj, three electrodes of COM apply touch-control pumping signal as shown in figure 10 respectively, three touch-control pumping signals that applied all are the sine waves that the direct current floors is arranged or do not have the direct current floors, and frequency is all identical with phase place, but the amplitude of waveform AC portion is different.
Embodiment six
Different is for present embodiment and embodiment one to embodiment five, when touch-control is surveyed, to the Gi of TFT as shown in Figure 2, Sj, three electrodes of COM apply touch-control pumping signal as shown in figure 11 respectively, the combination of this pumping signal does not make the mean value of pixel electrode current potential Vd and COM electrode potential Vcom all remain unchanged, but can make the mean value of both potential difference (PD) Vd-Vcom remain unchanged, the influence that yet can allow display effect not surveyed by touch-control.
Embodiment seven
The another sequential of show electrode time division multiplex scheme as shown in figure 12.Survey the period as touch-control with the frame blanking time period between per twice display frame.In this time period the inside, earlier simultaneously all row electrode lines Gi of display screen and row electrode wires Sj are applied one and saturated preset driving (predrive, pre-driving), signal waveform on three electrodes of Gi, Sj and COM as shown in figure 13, the touch-control pumping signal is the sine wave that the direct current floors is arranged or do not have the direct current floors.Potential difference (PD) Vgs between Gi-Sj between-the 17V, is lower than the cut-off voltage that allows TFT be in cut-off state at-10.5V, avoids influence to show; Potential difference (PD) Vgc between Gi-COM is 5V at-10.5V to the potential difference (PD) Vsc the between-12V, between Sj-COM, all surpasses the driven saturated voltage of liquid crystal molecule.Under the effect of the driven saturated voltage that is applied, the liquid crystal molecule between liquid crystal molecule, row electrode and the COM electrode in the LCDs between column electrode and the COM electrode, all consistent direction that turns to trend to be parallel to electric field rapidly of orientation.As shown in figure 14, when applying electric field E for the positivity liquid crystal material molecules, the arrangement of liquid crystal molecule is parallel to the ordered state of direction of an electric field.Respectively display screen line electrode wires Gi and row electrode wires Sj are applied the touch-control pumping signal again, and detect the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively; Saturated predrive voltage before makes the Liquid Crystal Molecules Alignment unanimity, got rid of the variation of the distributed capacitance that liquid crystal material dielectric coefficient anisotropy causes, detect on each bar row electrode lines and each bar row electrode wires on during the variation of touching signals, measurement environment on the different diverse locations constantly trends towards unanimity, helps the stability and the consistance of touch-control result of detection.
During to the liquid crystal extra electric field, because liquid crystal molecule is nonpolarity molecule, can not be subjected to the influence of the positive negative direction of electric field as the arrangement of Figure 14 liquid crystal molecule, thus the instantaneous voltage on electrode in the predrive link can just can bear, as long as keep driven saturated to liquid crystal.So be applied to the waveform of pre-drive signal on the same electrode of display screen and touch-control pumping signal or frequency, amplitude can be identical, even pre-drive signal and touch-control pumping signal are adopted same signal.
Embodiment eight
Different with embodiment seven is that TFT-LCD adopts the negative liquid crystal material in this example, as shown in figure 15.
Embodiment nine
The sequential of show electrode time division multiplex scheme as shown in figure 16.After black frame, just respectively display screen line electrode wires Gi and row electrode wires Sj are applied the touch-control pumping signal, and detect the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively.Utilize black frame to be in unanimity by Liquid Crystal Molecules Alignment, got rid of the variation of the distributed capacitance that liquid crystal material dielectric coefficient anisotropy causes, detect on each bar row electrode lines and each bar row electrode wires on during the variation of touching signals, measurement environment on the different diverse locations constantly trends towards unanimity, helps the stability and the consistance of touch-control result of detection.
Embodiment ten
Different with embodiment nine is that a sequential again of show electrode time division multiplex scheme as shown in figure 17.After normal display frame with after the black frame, all respectively display screen line electrode wires Gi and row electrode wires Sj are applied the touch-control pumping signal, and detect the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively.Like this, both utilized the frame blanking time between display frame fully, and all the display screen electrode had been switched to the touch-control sensing electrode in each frame blanking time and use; Utilize black frame Liquid Crystal Molecules Alignment unanimity again, the variation of the distributed capacitance that eliminating liquid crystal material dielectric coefficient anisotropy causes; The inconsistent influence to testing environment of Liquid Crystal Molecules Alignment is eliminated in comprehensive judgement.
Embodiment 11
Usually, finger and one group of interelectrode overlapping width of display screen that uses as the touch-control sensing electrode are below 5mm, and base plate glass thickness is 0.3mm, and coupling capacitance 1831 just is approximately 10pF; Be about 30K Ω for common TFT-LCD sampling resistor 1820 and equivalent resistance 1821 sums, the touching signals on the display screen electrode that uses as the touch-control sensing electrode is partly from coupling capacitance 1831 finger that lets out; When touch-control driving source output Vrms=5V sinusoidal wave, the leakage current Δ i that coupling capacitance 1831 causes with the relation of touch-control driving source frequency change as shown in figure 19.The frequency of touch-control pumping signal constitutes main influence to the capacitive reactance of coupling capacitance 1831, and the capacitive reactance difference, electric current is just different from the size of the touching signals that finger lets out.Frequency is too low, and coupling capacitance 1831 capacitive reactances are too little, and the touch-control of 400 pairs of touch control objects of touch control display is insensitive, and it is disconnected to be easy to generate failing to judge of touch-control.The frequency of touch-control pumping signal is selected bigger to the influence of touch-control detection reliability, particularly when being added with under the situation of protection face-piece before the display again.
As can be seen from Figure 19, in the experimental result of reality, when the frequency of touch-control driving source is lower than 10KHz, i is less for the leakage current Δ, more obviously be difficult to distinguish with neighbourhood noise, touch-control driving source frequency configuration at 10KHz or when above, is only the reasonable circuit parameter that utilizes the display screen electrode to use as the touch-control sensing electrode.
Embodiment 12
Usually, finger and one group of interelectrode overlapping width of display screen that uses as the touch-control sensing electrode are below 5mm, and base plate glass thickness is 0.3mm, and coupling capacitance 2032 just is approximately 10pF; Be about 30K Ω for common TFT-LCD sampling resistor 2020 and equivalent resistance 2021 sums.When people's finger touch touch display screen is surperficial, because the existence of coupling capacitance 2031 and 2032, touching signals on the display screen electrode that uses as the touch-control sensing electrode partly flows to the COM electrode from coupling capacitance 2031, again from coupling capacitance 2032 parts of COM electrode and the finger finger that lets out.When selecting the touch-control pumping signal of high frequency for use, just bigger from coupling capacitance 2031 and the 2032 electric current Δ i that leak, the ability that touching signals penetrates the COM electrode screening is just stronger, can obtain reasonable touch-control detectivity.
Embodiment 13
Display screen line electrode wires Gi and row electrode wires Sj are applied frequency in 1MHz or above touch-control pumping signal, and detect the variation of the touching signals of flow through each bar row electrode lines and each bar row electrode wires respectively.Though the arrangement of liquid crystal molecule is not the same on the diverse location of TFT-LCD, but because the anisotropic effect of dispersion of liquid crystal material dielectric coefficient, for 1MHz or above touch-control pumping signal, still got rid of the variation of the distributed capacitance that liquid crystal material dielectric coefficient anisotropy causes, detect on each bar row electrode lines and each bar row electrode wires on during the variation of touching signals, measurement environment on the different diverse locations constantly trends towards unanimity, helps the stability and the consistance of touch-control result of detection.
Embodiment 14
Touch control display 400 shown in Figure 4, display adopts TFT-LCD.The actual touch-control that carries out normally is that detected object is measured with the voltage signal when surveying.The equivalent electrical circuit of measuring as shown in figure 18.The 1810th, the display screen electrode is provided the touch-control driving source of touch-control pumping signal, the 1820th, the sampling resistor of touching signals testing circuit in the touch-control circuit, 1821 is one group of equivalent resistance as the display screen electrode of touch-control sensing electrode use, 1830 is one group of distributed capacitance as other electrodes in the relative display screen of display screen electrode of touch-control sensing electrode use, the 1831st, finger and one group of interelectrode coupling capacitance of display screen of using as the touch-control sensing electrode, 1832 is one group of display screen electrode that uses as the touch-control sensing electrode and the electric capacity between the COM electrode, the 1841st, the touching signals sampled point of measurement touching signals change in voltage, the 1840th, the detection reference point of measurement touching signals change in voltage, here be to select the output terminal of touch-control driving source 1810 as the reference point, in fact the potential point that can also select other is a reference point, as the ground end of touch-control circuit, or the positive power source terminal of touch-control circuit, or the negative power end of touch-control circuit, or in the contrast circuit a bit, or another group electrode wires etc. can both have good detection effect on the touch screen.Touch-control driving source 1810 is a square-wave signal, because 1830 and 1831 are capacitive loads, the square-wave signal of touch-control excitation waveform occurs discharging and recharging on these two electric capacity.The touching signals waveform of the output waveform of touch-control driving source 1810 and touching signals sampled point 1841 as shown in figure 21.
Present embodiment adopts instantaneous method of measuring to the detection method of touching signals, measure the current potential of touching signals sampled point 1841 on a certain specific phase site, touch information is obtained in the variation of detected this specific phase site current potential in the more different frame blanking time periods; Described a certain specific phase site is meant the specific phase site with respect to touch-control driving source 1810 output terminal waveforms.Circuit shown in Figure 180 with the excitation source signal be on the branch road at circuit source, sampling resistor place be 1830 and 1,831 two electric capacity parallel connections again with 1820 and 1,821 two RC loops that resistance is connected.Survey the period at touch-control, circuit shown in Figure 180 is applied the touch-control pumping signal, circuit will produce charge and discharge process to electric capacity.T1 and T2 section are that electric capacity begins to be charged to the time period that charging is finished between the phase region of T1 on the touching signals sampled point 1841 between the phase region that is fit to sampling among Figure 21, are that electric capacity begins to discharge into the time period that discharge is finished between the phase region of T2.
All be on the specific phase site with respect to touch-control driving source 1810 output terminal waveforms for guaranteeing to demonstrate,prove each time detection to touching signals, need a series of synchronized relation that keeps strict.The synchronized relation here is made up of three synchronized relations: display frame synchronization, synchronous, the touch-control excitation waveform phase-locking of touch-control driving pulse number.Display frame synchronization: begin to apply the touch-control pumping signal at every turn and all be a certain fixed time in the frame blanking time period between twice display frame; The driving pulse number is synchronous: from beginning to apply the touch-control pumping signal to the display screen electrode that uses as the touch-control sensing electrode, begin to calculate touch-control excitation signal pulse number, the moment of at every turn obtaining sampled data all is on the touch-control excitation signal pulse number of same sequence number; The excitation waveform phase-locking: the moment of at every turn obtaining sampled data all is on the specific phase site of touch-control driving source output terminal waveform, and the choice of location in this specific phase site between T1 or these two phase regions of T2 in.A complete synchronizing process is shown in Figure 22 a, Figure 22 b, Figure 22 c.Figure 22 a is the time-multiplexed sequential chart of display screen, the column electrode of display screen, row electrode, COM electrode are in reading scan time period the inside, cooperate the corresponding shows signal of output, order is carried out reading scan, and multiplexing during in the frame blanking time period (H section and K section) at the column electrode of display screen, row electrode, COM electrode in the touch control detection attitude, apply square wave touch-control pumping signal and detect by detecting requirement; Figure 22 b is the enlarged diagram of H section and K section (frame blanking time period) among Figure 22 a, and the same fixed time of display screen electrode in the frame blanking time period begins to apply square wave touch-control pumping signal shown in Figure 22 b, and achieve frame is synchronous; Figure 22 c is the enlarged diagram of X section among Figure 22 b (load pumping signal and detection time section), after display frame blanking time section the inside process frame synchronization, begin to apply the touch-control pumping signal, simultaneously also begin to calculate the excitation signal pulse number, each sample detecting all is to be controlled on the touch-control excitation signal pulse number of same sequence number, and is synchronous to realize touch-control driving pulse number; In this touch-control excitation signal pulse the inside, the moment of at every turn obtaining sampled data all is on certain particular phases of touch-control excitation output terminal waveform, with realize with touch-control excitation waveform phase place synchronously.
Embodiment 15
Different with embodiment 14 is, touch-control driving source 1810 is a sine wave signal, because 1830 and 1831 is capacitive loads, on the sinusoidal wave touch-control driving source band behind the capacitive load, waveform on the touching signals sampled point is still sinusoidal wave, but the variation of amplitude and phase place has taken place, and the touching signals waveform of the output waveform of touch-control driving source 1810 and touching signals sampled point as shown in figure 23.
Present embodiment adopts the phase-shift measurement method to the detection method of touching signals, and the more different frame blanking time periods is gone up the phase shifts in touching signals sampled point 1841 a certain specific phase sites, obtains touch information; Described a certain specific phase site is meant the specific phase site with respect to touch-control driving source 1810 output terminal waveforms.Shown in Figure 180 with the touch-control excitation source signal be on the branch road at circuit source, sampling resistor place be 1830 and 1,831 two electric capacity parallel connections again with 1820 and 1,821 two RC loops that resistance is connected.Survey the period at touch-control, circuit shown in Figure 180 is applied the touch-control pumping signal, the decline of amplitude and the delay of phase place can take place by the RC loop in sine wave; During the finger touch display screen, coupling capacitance 1831 has caused the variation of C in the RC loop, measures the variation of relative 1810 output terminal waveform pass zero point mistimings of touch-control driving source of sinusoidal wave zero crossing at the touching signals sampled point, judges whether touch-control takes place.Measure the variation that the touching signals waveform phase moves on the touching signals sampled point, also can measure on the peak point of sine wave or on other phase points.
Equally, all be on the specific phase site with respect to touch-control driving source 1810 output terminal waveforms, need a series of synchronized relation that keeps strict for guaranteeing each time detection to touching signals.The synchronized relation here is made up of three synchronized relations: display frame synchronization, synchronous, the touch-control excitation waveform phase-locking of touch-control driving pulse number.Display frame synchronization: begin to apply the touch-control pumping signal at every turn and all be a certain fixed time in the frame blanking time period between twice display frame; The driving pulse number is synchronous: from beginning to apply the touch-control pumping signal to the display screen electrode that uses as the touch-control sensing electrode, begin to calculate touch-control excitation signal pulse number, the moment of at every turn obtaining sampled data all is on the touch-control excitation signal pulse number of same sequence number; Excitation waveform phase-locking: will measure the specific phase site of touching signals waveform on the touching signals sampled point, and carry out the comparison of time with touch-control driving source output terminal waveform same phase point; Sinusoidal wave phase shift information is full phase place, so see moving of same specific phase site as long as all be at every turn.A complete synchronizing process is shown in Figure 24 a, Figure 24 b, Figure 24 c.Figure 24 a is the time-multiplexed sequential chart of display screen, the column electrode of display screen, row electrode, COM electrode are in reading scan time period the inside, cooperate the corresponding shows signal of output, order is carried out reading scan, and multiplexing during in the touch control detection attitude in the frame blanking time period (H section and K section) that the column electrode of display screen, row electrode, COM electrode are showing, by detecting requirement loading sine wave exciting signal and detecting; Figure 24 b is the enlarged diagram of H section and K section (the frame blanking time period of demonstration) among Figure 24 a, and the same fixed time of display screen electrode in the frame blanking time period that shows begins to apply sinusoidal wave touch-control pumping signal shown in Figure 24 b, and achieve frame is synchronous; Figure 24 c is the enlarged diagram of X section among Figure 24 b (apply touch-control pumping signal and detection time section), after the frame blanking time period the inside process frame synchronization that shows, begin to apply sinusoidal wave touch-control pumping signal, simultaneously also begin to calculate touch-control excitation signal pulse number, each sample detecting all is to be controlled on the touch-control excitation signal pulse number of same sequence number, and is synchronous to realize the driving pulse number; In this sinusoidal wave touch-control excitation signal pulse the inside, the moment of at every turn obtaining sampled data all is on certain identical specific phase site of touch-control excitation output terminal waveform, with realize with touch-control excitation waveform phase place synchronously.
Embodiment 16
Embodiment 14 and mode 15 all are to use instantaneous method of measuring, come the touch control display 400 of Fig. 4 is carried out the touch-control detection.This instantaneous method of measuring is the detection of carrying out in the utmost point short time period in specific phase site touching signals, and its principal feature is exactly that detection speed is fast.Three kinds of circuit structures realizing that the instantaneous method of measuring touching signals detects such as Figure 25, Figure 26 and shown in Figure 27.Touching signals testing circuit structure all is made up of input passage, data sampling channel and data processing and sequential control circuit.The input passage has impact damper, first order differential amplifier circuit and second level differential amplifier circuit; Data sampling channel has analog to digital conversion circuit; Data processing and sequential control circuit are the central processing units (CPU, MCU) with data operation ability, data input and output interfaces, and central processing unit has Control Software, data processing software.
Shown in Figure 25 is a kind of touching signals testing circuit structural drawing of instantaneous method of measuring, the 2510th, the signal of touching signals sampled point, the 2511st, the signal of detection reference point, the signal 2511 of the signal 2510 of touching signals sampled point and detection reference point is respectively through after impact damper 2520 and impact damper 2521 bufferings, as the input signal of first order differential amplifier 2522; The output of first order differential amplifier 2522 is re-used as one of them input of second level differential amplifier 2523, the 2524th, regulation voltage output, it is as reference potential, connect another input of second level differential amplifier 2523, be used for deducting the floors of first order differential amplifier circuit output signal; Second level differential amplifier 2523 outputs to analog to digital converter 2525,2525 carry out synchronized sampling under the control of the synchronous control signal 2530 that central processing unit (CPU, MPU) 2526 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 2526, carries out data processing and touch-control judgement by central processing unit again.
Shown in Figure 26 is a kind of touching signals testing circuit structural drawing of instantaneous method of measuring, the 2610th, the signal of touching signals sampled point, the 2611st, the signal of detection reference point, the signal 2611 of the signal 2610 of touching signals sampled point and detection reference point is respectively through after impact damper 2620 and impact damper 2621 bufferings, as the input signal of first order differential amplifier 2622; The output of first order differential amplifier 2622 is re-used as one of them input of second level differential amplifier 2623, the output of feedback regulation mimic channel 2624 usefulness second level differential amplifiers 2623 is as feedback input signal and the automatic output voltage of regulating, it is as reference potential, connect another input of second level differential amplifier 2623, be used for deducting the floors of first order differential amplifier circuit output signal; Second level differential amplifier 2623 outputs to analog to digital converter 2625,2625 carry out synchronized sampling under the control of the synchronous control signal 2630 that central processing unit (CPU, MPU) 2626 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 2626, carries out data processing and touch-control judgement by central processing unit again.
Shown in Figure 27 is a kind of touching signals testing circuit structural drawing of instantaneous method of measuring, the 2710th, the signal of touching signals sampled point, the 2711st, the signal of detection reference point, the signal 2711 of the signal 2710 of touching signals sampled point and detection reference point is respectively through after impact damper 2720 and impact damper 2721 bufferings, as the input signal of first order differential amplifier 2722; The output of first order differential amplifier 2722 is re-used as one of them input of second level differential amplifier 2723, central processing unit (CPU, MPU) 2726 sends according to the touch-control operation result and regulates data to digital to analog converter 2724,2724 output voltage is as reference potential, connect another input of second level differential amplifier 2723, be used for deducting the floors of first order differential amplifier circuit output signal; Second level differential amplifier 2723 outputs to analog to digital converter 2725,2725 carry out synchronized sampling under the control of the synchronous control signal 2730 that central processing unit (CPU, MPU) 2726 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 2726, carries out data processing and touch-control judgement by central processing unit again.
The difference of Figure 25, Figure 26, three kinds of instantaneous method of measuring touching signals testing circuits shown in Figure 27 is: scheme shown in Figure 25 is that manual method is provided with a reference potential for the second order difference circuit, and the second order difference circuit is had basic regulating power; Scheme shown in Figure 26 is that the output end signal of second order difference circuit feeds back to the second order difference circuit as reference potential again through mimic channel, and the second order difference circuit is had regulating power from motion tracking; Scheme shown in Figure 27 is that the central processing unit calculated result is fed back to the second order difference circuit as reference potential through D/A converting circuit, and the second order difference circuit is had intelligentized regulating power.
The display screen of different size and resolution, the resistance of its electrode is generally more than 2K, and testing circuit and touch screen power on the tie point of polar curve, because of the input impedance of testing circuit is shunted touching signals, the input impedance of testing circuit is big more, and is more little to the shunting action of touching signals.When the input impedance of testing circuit is more than 2.5 times the time, touching signals can both reflect touch action information, so require the input passage to the input impedance of electrode wires at 5K Ω or more than the 5K Ω, adding upper bumper as Figure 25,26,27 between differential amplifier circuit and touch screen power on the tie point of polar curve is exactly in order to increase the input impedance of testing circuit.
Embodiment 17
Embodiment 14 and mode 15 also can be used the measurement of average value method, come the touch control display 400 of Fig. 4 is carried out the touch-control detection.This measurement of average value method is the detection of carrying out in the regular hour section touching signals, and the mean value that obtains touching signals is as measurement result.Though the measurement of average value method is slower than instantaneous method of measuring, its principal feature can be eliminated the part high frequency interference exactly, the more steady judgement that helps touch-control of measurement data.Effective value is a kind of in the mean value.Three kinds of circuit structures realizing that the measurement of average value method detects touching signals such as Figure 28, Figure 29 and shown in Figure 30.Its touching signals testing circuit structure all is made up of input passage, data sampling channel, data processing and sequential control circuit.The input passage has impact damper, first order differential amplifier circuit, effective value metering circuit and second level differential amplifier circuit; Data sampling channel has analog to digital conversion circuit; Data processing and sequential control circuit are the central processing units (CPU, MCU) with data operation ability, data input and output interfaces, and central processing unit has Control Software, data processing software.
Shown in Figure 28 is a kind of touching signals testing circuit structural drawing of measurement of average value method, the 2810th, the signal of touching signals sampled point, the 2811st, the signal of detection reference point, the signal 2811 of the signal 2810 of touching signals sampled point and detection reference point is respectively through after impact damper 2820 and impact damper 2821 bufferings, as the input signal of first order difference differential amplifier circuit unit 2822; First order difference differential amplifier circuit unit 2822 includes the frequency gating circuit, the gating frequency of gating circuit is the frequency of driving source touching signals, it carries out gating to the output that difference is amplified, output behind the gating is re-used as the input of effective value converter 2823, and 2823 effective value output is as the input of second level differential amplifier 2824; The 2825th, regulation voltage output, it is connected to another input end of second level differential amplifier 2824 as reference potential, is used for deducting the floors of 2823 effective value output signal; Second level differential amplifier 2824 outputs to analog to digital converter 2826,2826 carry out synchronized sampling under the control of the synchronous control signal 2830 that central processing unit (CPU, MPU) 2827 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 2827, carries out data processing and touch-control judgement by central processing unit again.
Shown in Figure 29 is a kind of touching signals testing circuit structural drawing of measurement of average value method, the 2910th, the signal of touching signals sampled point, the 2911st, the signal of detection reference point, the signal 2911 of the signal 2910 of touching signals sampled point and detection reference point is respectively through after impact damper 2920 and impact damper 2921 bufferings, as the input signal of first order difference differential amplifier circuit unit 2922; First order difference differential amplifier circuit unit 2922 includes the frequency gating circuit, the gating frequency of gating circuit is the frequency of driving source touching signals, it carries out gating to the output that difference is amplified, output behind the gating is re-used as the input of effective value converter 2923, and 2923 effective value output is as the input of second level differential amplifier 2924; The output of feedback regulation mimic channel 2925 usefulness second level differential amplifiers 2924 is as feedback input signal and the automatic output voltage of regulating, it is as reference potential, be connected to another input end of second level differential amplifier 2924, be used for deducting the floors of 2923 effective value output signal; Second level differential amplifier 2924 outputs to analog to digital converter 2926,2926 carry out synchronized sampling under the control of the synchronous control signal 2930 that central processing unit (CPU, MPU) 2927 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 2927, carries out data processing and touch-control judgement by central processing unit again.
Shown in Figure 30 is a kind of touching signals testing circuit structural drawing of measurement of average value method, the 3010th, the signal of touching signals sampled point, the 3011st, the signal of detection reference point, the signal 3011 of the signal 3010 of touching signals sampled point and detection reference point is respectively through after impact damper 3020 and impact damper 3021 bufferings, as the input signal of first order difference differential amplifier circuit unit 3022; First order difference differential amplifier circuit unit 3022 includes the frequency gating circuit, the gating frequency of gating circuit is the frequency of driving source touching signals, it carries out gating to the output that difference is amplified, output behind the gating is re-used as the input of effective value converter 3023, and 3023 effective value output is as the input of second level differential amplifier 3024; Central processing unit (CPU, MPU) 3027 sends according to the touch-control operation result and regulates data to digital to analog converter 3025,3025 output voltage is as reference potential, be connected to another input end of second level differential amplifier 3024, be used for deducting the floors of 3023 effective value output signal; Second level differential amplifier 3024 outputs to analog to digital converter 3026,3026 carry out synchronized sampling under the control of the synchronous control signal 3030 that central processing unit (CPU, MPU) 3027 is exported, the transformation result of sampling sends to central processing unit (CPU, MPU) 3027, carries out data processing and touch-control judgement by central processing unit again.
The difference of Figure 28, Figure 29 and three kinds of measurement of average value method touching signals testing circuits shown in Figure 30 is: scheme shown in Figure 28 is that manual method is provided with a reference potential for the second order difference circuit, and the second order difference circuit is had basic regulating power; Scheme shown in Figure 29 is that the output end signal of second order difference circuit feeds back to the second order difference circuit as reference potential again through mimic channel, and the second order difference circuit is had regulating power from motion tracking; Scheme shown in Figure 30 is that the central processing unit calculated result is fed back to the second order difference circuit as reference potential through D/A converting circuit, and the second order difference circuit is had intelligentized regulating power.
The display screen of different size and resolution, the resistance of its electrode is generally more than 2K, and testing circuit and touch screen power on the tie point of polar curve, because of the input impedance of testing circuit is shunted touching signals, the input impedance of testing circuit is big more, and is more little to the shunting action of touching signals.When the input impedance of testing circuit is more than 2.5 times the time, touching signals can both reflect touch action information, so require the input passage to the input impedance of electrode wires at 5K Ω or more than the 5K Ω, adding upper bumper as Figure 28,29,30 between differential amplifier circuit and touch screen power on the tie point of polar curve is exactly in order to increase the input impedance of testing circuit.
Embodiment 18
We mention introducing embodiment ten four o'clock, touch control display 400 shown in Figure 4, and display adopts TFT-LCD, and the equivalent electrical circuit of measurement is as shown in figure 18.Touch-control driving source 1810 is a square-wave signal, because 1830 and 1831 are capacitive loads, the square-wave signal of touch-control excitation waveform occurs discharging and recharging on these two electric capacity.The touching signals waveform of the output waveform of touch-control driving source 1810 and touching signals sampled point 1841 as shown in figure 21, and is for present embodiment is described, existing again to Figure 21 label, as shown in figure 31.
Present embodiment adopts the temporal characteristics mensuration to the detection method of touching signals, measures in touching signals sampled point 1841 charge and discharge process variation in the time interval between two set current potentials, obtains touch information.As shown in figure 31, measure in the charging process of touching signals sampled point 1841 waveforms the time T 423 between two set current potential V422 and the V421, time T 424 in the discharge process between two set current potential V421 and the V422 can reflect the variation of this capacitive load.The coupling capacitance 1831 of Figure 18 equivalent electrical circuit will produce when the finger touch display screen, has changed the capacitive load and the time constant of circuit, and change has also just taken place for time interval T423 and T424 between two set current potentials.The variation of measuring intervals of TIME T423 and T424 just can obtain the information of touch-control, and set current potential V421 and V422 choose two current potentials of sampled point 1841 in the charge and discharge process.
Realize circuit structure such as Figure 32 and shown in Figure 33 that temporal characteristics mensuration touching signals detects.Its touching signals testing circuit structure all is made up of input and data sampling channel, data processing and sequential control circuit.Input and data sampling channel have impact damper, D/A converting circuit or voltage-regulation output unit, comparer, register; Data processing and sequential control circuit are the central processing units (CPU, MCU) with data operation ability, data input and output interfaces, and central processing unit has Control Software, data processing software.
Figure 32 is a kind of touching signals testing circuit structural drawing of temporal characteristics mensuration, the 3210th, the signal of touching signals sampled point, 3211 is set current potentials (V421), produce by voltage-regulation output unit 3220,3212 is set current potentials (V422), is produced by voltage-regulation output unit 3221; The signal 3210 of touching signals sampled point enters comparer 3232 with 3211 these set current potentials and compares through impact damper 3230 buffering outputs; The signal 3210 of touching signals sampled point enters comparer 3233 with 3212 these set current potentials and compares through impact damper 3231 buffering outputs; Central processing unit (CPU, MCU) 3235 produces the numeration pulse signal 3240 of counter 3234, and the output potential of comparer 3233 is as the startup numeration signal of counter 3234, and the output potential of comparer 3232 is as the signal that counts that stops of counter 3234; Reading after counter 3234 stops to count is read by central processing unit (CPU, MCU) 3235, after finishing, reading sends reset signal 3241 zero clearing counters 3234 by central processing unit (CPU, MCU) 3235, ready for reading next time, and carry out data processing and touch-control is judged by central central processing unit (CPU, MCU) 3235.
Figure 33 is a kind of touching signals testing circuit structural drawing of temporal characteristics mensuration, the 3310th, the signal of touching signals sampled point, central processing unit (CPU, MCU) 3327 presets by program or historical the detection judges that exporting corresponding data exports set current potentials 3311 (V421) to digital to analog converter 3320, and also output data is to digital to analog converter 3321 output set current potentials 3312 (V422); The signal 3310 of touching signals sampled point enters comparer 3324 through impact damper 3322 buffering outputs with 3311 these set current potentials; The signal 3310 of touching signals sampled point enters comparer 3325 through impact damper 3323 buffering outputs with 3312 these set current potentials; Central processing unit (CPU, MCU) 3327 produces the numeration pulse signal 3330 of counter 3326, and the output potential of comparer 3325 is as the startup numeration signal of counter 3326, and the output potential of comparer 3324 is as the signal that counts that stops of counter 3326; Reading after counter 3326 stops to count is read by central processing unit (CPU, MCU) 3327, after finishing, reading sends reset signal 3331 zero clearing counters 3326 by central processing unit (CPU, MCU) 3327, ready for reading next time, and carry out data processing and touch-control is judged by central central processing unit (CPU, MCU) 3327.
The difference that Figure 32 and two kinds of temporal characteristics mensuration touching signals shown in Figure 33 detect is: scheme shown in Figure 32 is that manual method is provided with two set current potential V421 and V422 to comparer; Scheme shown in Figure 33 is two set current potential V421 and V422 to comparer to be set by central processing unit, central processing unit presets by program or will export corresponding data to D/A converting circuit after the measurement result computing before, make its output as set relatively current potential, set setting of comparing current potential V421 and V422 is had intelligentized regulating power.
Embodiment 19
Different with embodiment 18, touch-control driving source 1810 is a sine wave signal in this example, because 1830 and 1831 is capacitive loads, on the sinusoidal wave touch-control driving source band behind the capacitive load, waveform on the touching signals sampled point is still sinusoidal wave, but the variation of amplitude and phase place has taken place, and the touching signals waveform of the output waveform of touch-control driving source 1810 and touching signals sampled point 1841 as shown in figure 23.
Present embodiment adopts the phase-shift measurement method to the detection method of touching signals, and the more different frame blanking time periods is gone up the phase shifts in specific phase site on the touching signals sampled point 1841, obtains touch information.Can reflect that as can be seen this touches the influence of electric capacity by the change of Measurement Phase, and the change of phase place also can reflect from measuring intervals of TIME, the detection synoptic diagram in this time interval is also seen as shown in figure 23, when display screen does not have finger touch, because the existence of the distributed capacitance 1830 among Figure 18, the waveform that detects the relative touch-control driving source of the touching signals waveform output terminal 1840 on the touching signals sampled point 1841 has the delay of phase place; The coupling capacitance 1831 of equivalent electrical circuit shown in Figure 180 will produce when the finger touch display screen, increased the capacitive load of circuit, it is big that zero crossing on the touching signals sampled point 1841 and the time T between the zero crossing between the driving source 500 can become, and promptly produces further phase shift.The variation of Measuring Time T500 just can obtain the information of touch-control.According to the difference of touch-control excitation sources waveform, the current potential of specific phase site correspondence can be zero point or other potential point.
Realize circuit structure such as Figure 34 and shown in Figure 35 that phase-shift measurement method touching signals detects.Its touching signals testing circuit structure all is made up of input and data sampling channel, data processing and sequential control circuit.Input and data sampling channel have impact damper, D/A converting circuit or voltage-regulation output unit, comparer, register; Data processing and sequential control circuit are the central processing units (CPU, MCU) with data operation ability, data input and output interfaces, and central processing unit has Control Software, data processing software.
Figure 34 is a kind of touching signals testing circuit structural drawing of phase shift pattern measurement method, the 3410th, the signal of touching signals sampled point, the 3411st, detect the signal of reference point, the 3412nd, the current potential during specific phase site of correspondence of producing by voltage-regulation output unit 3420; The signal 3410 of touching signals sampled point is through impact damper 3430 buffering outputs, and the current potential corresponding with 3412 these specific phase sites enters comparer 3432 and compare; The signal 3411 of touching signals sampled point is through impact damper 3431 buffering outputs, and the current potential corresponding with 3412 these specific phase sites enters comparer 3433 and compare; Central processing unit (CPU, MCU) 3435 produces the numeration pulse signal 3440 of counter 3434, and the output potential of comparer 3433 is as the startup numeration signal of counter 3434, and the output potential of comparer 3432 is as the signal that counts that stops of counter 3434; Reading after counter 3434 numerations stop is read by central processing unit (CPU, MCU) 3435, after finishing, reading sends reset signal 3441 zero clearing counters 3434 by central processing unit (CPU, MCU) 3435, ready for reading next time, and carry out data processing and touch-control is judged by central central processing unit (CPU, MCU) 3435.
Figure 35 is a kind of touching signals testing circuit structural drawing of phase shift pattern measurement method, the 3510th, the signal of touching signals sampled point, the 3511st, the signal of detection reference point, central processing unit (CPU, MCU) 3526 presets according to program or historical detection judgement is exported corresponding data to digital to analog converter 3520, and the current potential 3512 of specific phase site correspondence promptly is the output potential of digital to analog converter 3520; The signal 3510 of touching signals sampled point is through impact damper 3521 buffering outputs, and the current potential corresponding with 3512 these specific phase sites enters comparer 3523 and compare; The signal 3511 of touching signals sampled point is through impact damper 3522 buffering outputs, and the current potential corresponding with 3512 these specific phase sites enters comparer 3524 and compare; Central processing unit (CPU, MCU) 3526 produces the numeration pulse signal 3530 of counter 3525, and the output potential of comparer 3524 is as the startup numeration signal of counter 3525, and the output potential of comparer 3523 is as the signal that counts that stops of counter 3525; Reading after counter 3525 numerations stop is read by central processing unit (CPU, MCU) 3526, after finishing, reading sends reset signal 3531 zero clearing counters 3525 by central processing unit (CPU, MCU) 3526, ready for reading next time, and carry out data processing and touch-control is judged by central central processing unit (CPU, MCU) 3526.
The difference that Figure 34 and two kinds of phase-shift measurement method touching signals shown in Figure 35 detect is: scheme shown in Figure 34 is to set the current potential of specific phase site correspondence with manual method; Scheme shown in Figure 35 is to be set the current potential of specific phase site correspondence by digital to analog converter by central processing unit, central processing unit by program pre-if will before the measurement result computing after the digital to analog converter feedback as the current potential of specific phase site correspondence, has intelligentized regulating power to the setting in specific phase site.
The measured touching signals phase characteristic of present embodiment in fact also is a kind of of temporal characteristics.
Embodiment 20
This also is conventional and the most natural touch control detection mode.
Embodiment 21
Different with embodiment 20, in this example be by a certain set interval i with the mode of scanning detect article one electrode in the N bar touch-control sensing electrode, i+1 bar, 2i+1 bar ..., until to the end N bar touch-control sensing electrode wires, thereby finish whole testing processes of an explore frame.
During i=2, promptly the detection of a touch-control sensing electrode wires scans synoptic diagram as shown in figure 37 at interval.
Embodiment 22
Different with embodiment 21 and 22 is, this example is to carry out touch-control with the detection mode that single channel coarse scan refinement is swept to survey: the touching signals testing circuit has a sense channel or a data sampling channel, the touch-control sensing electrode wires is divided into several subregions by every i bar one zoning, each subregion is chosen one or more touch-control sensing electrode wires and is represented electrode to carry out touch control detection together as the touch-control sensing of this subregion touch-control sensing electrode wires, and the best way is that each subregion whole touch-control sensing electrode wires parallel connection in the inside is represented electrode as a touch-control sensing; Represent electrode to detect by the district to touch-control sensing earlier, determine the zone that the touch-control action takes place; Segment scanning in the inside, zone that has the touch-control action to take place again and detect, obtain touch information more specifically.The purpose of the method is in order to save the time of touch control detection.
During i=3, the detection scanning synoptic diagram that single channel coarse scan refinement is swept as shown in figure 38.
Embodiment 23
This example is carried out touch-control with the detection mode of hyperchannel sequential scanning and surveyed: the touching signals testing circuit has a plurality of touching signals sense channels and a plurality of data sampling channel, whole touch-control sensing electrode wires is divided into the same number of group of number of touching signals sense channel, and each touching signals sense channel is responsible for the detection in the touch-control sensing electrode group.
A kind of scheme is that each touching signals sense channel is carrying out the sequential scanning detection in the group respectively, comprehensive all testing results of touching signals sense channels, the touch information of acquisition full screen simultaneously separately.Scanning sequency synoptic diagram when Figure 39 is three touching signals sense channels.
The another kind scheme is that each touching signals sense channel is carrying out the interval scan detection in the group respectively, comprehensive all testing results of touching signals sense channels, the touch information of acquisition full screen simultaneously separately.Scanning sequency synoptic diagram when Figure 40 is three touching signals sense channels.
Another scheme is that each touching signals sense channel is carrying out the coarse scan refinement and sweeps detection in the group separately respectively simultaneously, and comprehensive all testing results of touching signals sense channels obtain the touch information of full screen.Scanning sequency synoptic diagram when Figure 41 is three touching signals sense channels.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (4)
1. can get rid of the touch control display that the touch-control influence shows for one kind, comprise active display screen, display driver circuit, touch-control circuit, and make the display screen electrode not only be used for display driver but also be used for demonstration/touching signals gating output circuit or the demonstration/touching signals loaded circuit that touch-control is surveyed; Described touch-control circuit has touch-control driving source and touching signals testing circuit; Described demonstration/touching signals gating output circuit makes the display screen electrode or is communicated with the transmitting and displaying drive signal with display driver circuit, or is communicated with the transmission touching signals with touch-control circuit, and display driver and touch-control are surveyed time division multiplex display screen electrode; Described demonstration/touching signals loaded circuit makes display screen electrode transmitting and displaying drive signal and touching signals simultaneously, and display driver and touch-control are surveyed shared display screen electrode simultaneously; On a plate base of display screen, have active device array and column electrode group that is connected active device array and row electrode group, on another plate base of display screen, have public electrode; In the time period the inside of display screen electrode transmitting display signal therefor, display driver circuit is to the scanning of the column electrode execution sequence on the display screen, and the row electrode on the display screen, COM electrode cooperate the corresponding shows signal of output; There is a frame blanking time period between per two reading scan time periods, this time period the inside display screen is not carried out display driver, scanning stops to column electrode, display driver circuit is all exported non-select signal to all column electrodes, row electrode, COM electrode keep original output state or certain default output signal, and display screen top or whole active devices are in cut-off state; It is characterized in that:
In the period of display screen electrode transmission touching signals, the transient potential that the touching signals that is applied is had between each electrode is poor, makes the active device remain off state on the display screen, gets rid of the influence of touching signals to showing.
2. touch control display according to claim 1 is characterized in that:
Active device array on the described display screen substrate is a tft array, the grid that the row-column electrode line connects TFT respectively is with source electrode or be connected grid and the drain electrode of TFT respectively, the transient potential of the touching signals that applies is poor on the column electrode group that connects tft array and each strip electrode line of row electrode group, makes TFT remain off state whole or part on the display screen.
3. touch control display according to claim 1 is characterized in that:
Active device array on the described display screen substrate is a tft array, the grid that the row-column electrode line connects TFT respectively is with source electrode or be connected grid and the drain electrode of TFT respectively, in row electrode lines or row electrode wires, connect on the electrode wires of TFT grid and on the public electrode transient potential of the touching signals that applies poor, make whole or active device remain off state partly on the display screen.
4. touch control display according to claim 1 is characterized in that:
Described active display screen is a kind of in Thin Film Transistor-LCD, active matrix liquid crystal display panel, active organic LED display screen, the active CNT display screen.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202055060U CN201765574U (en) | 2009-09-27 | 2009-09-27 | Touch control display capable of eliminating touch control influence on display |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202055060U CN201765574U (en) | 2009-09-27 | 2009-09-27 | Touch control display capable of eliminating touch control influence on display |
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| CN201765574U true CN201765574U (en) | 2011-03-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013056472A1 (en) * | 2011-10-21 | 2013-04-25 | 智点科技（深圳）有限公司 | Drive method for active touch control system |
| CN104821151A (en) * | 2015-05-28 | 2015-08-05 | 西安诺瓦电子科技有限公司 | LED display control method and LED lamp plate |
| CN113064526A (en) * | 2021-04-13 | 2021-07-02 | 合肥松豪电子科技有限公司 | Scanning method of touch panel TP applied to TDDI chip encountering pit |
| CN113220163A (en) * | 2021-05-17 | 2021-08-06 | Tcl华星光电技术有限公司 | Scanning method, device and system of touch screen |
| CN116386563A (en) * | 2023-06-06 | 2023-07-04 | 惠科股份有限公司 | Driving method and driving device of display panel, display device and storage medium |
-
2009
- 2009-09-27 CN CN2009202055060U patent/CN201765574U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013056472A1 (en) * | 2011-10-21 | 2013-04-25 | 智点科技（深圳）有限公司 | Drive method for active touch control system |
| CN103221905A (en) * | 2011-10-21 | 2013-07-24 | 智点科技（深圳）有限公司 | Drive method for active touch control system |
| CN103221905B (en) * | 2011-10-21 | 2017-09-05 | 敦泰电子（深圳）有限公司 | A kind of driving method of active touch control system |
| CN104821151A (en) * | 2015-05-28 | 2015-08-05 | 西安诺瓦电子科技有限公司 | LED display control method and LED lamp plate |
| CN113064526A (en) * | 2021-04-13 | 2021-07-02 | 合肥松豪电子科技有限公司 | Scanning method of touch panel TP applied to TDDI chip encountering pit |
| CN113220163A (en) * | 2021-05-17 | 2021-08-06 | Tcl华星光电技术有限公司 | Scanning method, device and system of touch screen |
| CN116386563A (en) * | 2023-06-06 | 2023-07-04 | 惠科股份有限公司 | Driving method and driving device of display panel, display device and storage medium |
| CN116386563B (en) * | 2023-06-06 | 2023-08-18 | 惠科股份有限公司 | Driving method and driving device of display panel, display device and storage medium |
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