The driving circuit and method of touching display screen, display screen and display comprising itTechnical field
The present invention relates to field of display technology, and in particular to the driving of touch display technology more particularly to touching display screenCircuit and method, display screen and display comprising it.
Background technique
In the prior art, dual chip scheme usually can be used in the driving circuit of touching display screen, that is, includes display drivingChip (DDIC) and touch chip (TPIC).When realizing, it usually needs two panels flexible circuit board (Flexible PrintedCircuit, FPC), usually referred to separately as TP FPC and main FPC.Sensing electrode RX is connected to TPIC by TP FPC, is passed through simultaneouslyConnector realizes the communication between TPIC, DDIC, host.
Fig. 1 is the driving circuit 100 of the driving electrodes TX of existing touching display screen, includes scanning element 10 and gating output20 two parts of unit.
For scanning element 10 for realizing the scanning step by step of driving electrodes TX, input includes: scanning trigger signal SDST, the1 scan clock signal SDCK1, the 2nd scan clock signal SDCK2, reset signal RESET.
Output unit 20 is gated according to the output of prime scanning element 10, determines the output level of TX.It includes: choosing that it, which is inputted,Logical control C, is connected with the output of scanning element 10, and idle switches switching signal HRSW, scanning switching switching signal TXSW, scanningPulse high level TXH and scanning pulse low level TXL.
Fig. 2 is the truth table for gating output unit 20.Wherein, scanning pulse high level TXH indicates that output is high level, sweepsRetouching pulses low TXL indicates that output is low level, and Hi-z indicates that output is vacant state.In existing design, gating control C withThe output COUT of scanning element 10 is connected, and idle switching switching signal HRSW is fixed as low level Low, scanning pulse high levelTXH connection high level VTPH, scanning pulse low level TXL connection common level VCOM.When the output of scanning element 10 COUT is high,The output for gating output unit 20 is determined by scanning switching switching signal TXSW；When the output of scanning element 10 COUT is low, drivingElectrode TX output is determined by idle switching switching signal HRSW, when idle switching switching signal HRSW is fixed as low level Low,Driving electrodes TX output is scanning pulse low level TXL (i.e. common level VCOM).
Fig. 3 is the timing diagram of the touch control electrode driving circuit of the touching display screen of Fig. 1.It include that 29 TX are with driving circuit, in a frame time, (VFP) and vertical flyback (VBP) are swept before carrying out vertically first, then, alternately shows scanning (displayCorresponding region) and touch-control scanning (the 1st driving electrodes TX_1 or the 2nd driving electrodes TX_2~29th piece driving electrodes in figureThe corresponding region TX_29).After the completion of 29 TX scannings, it will do it 3 noise detectings (N_1, N_2 and N_3 in figure).
As shown in figure 3, DDIC and TPIC detects signal (TSVD-Touch by touching synchronous verticalSynchronization Vertical Detection), touch level of synchronization detect signal (TSHD-TouchSynchronization Horizontal Detection), external scan driving signal EXVCOM1 communicated.
It touches synchronous vertical detection signal TSVD and TPIC is sent to by DDIC, when notice TPIC, which starts progress touch-control, is sweptIt retouches.After TPIC detects that touching synchronous vertical detects signal TSVD failing edge, start single pass.
It touches level of synchronization detection signal TSHD and TPIC is sent to by DDIC, when is notice each driving electrodes TX of TPICIt is scanned.After TPIC detects that touching synchronous vertical detects signal TSVD failing edge, scanning pulse is not sent at once, is being examinedIt measures after touching level of synchronization detection signal TSHD rising edge, just sends single pass pulse.
External scan driving signal EXVCOM1 is sent to DDIC by TPIC, which is scanning pulse signal.DDIC is defeatedExternal scan driving signal is depended on to the scanning switching switching signal TXSW signal of the driving circuit of driving electrodes TX outEXVCOM1。
When certain root driving electrodes TX does not work and (is not scanned), the output COUT of corresponding scanning circuit be it is low, due to the spare timeWhen switch switching signal HRSW fixed reception gate driving low level VGL, according to fig. 2 truth table, driving electrodes TX output is public affairsThe flat VCOM of common-battery.
When nth root driving electrodes TX_N (n=1,2 ..., 29) works, in Fig. 3, " nth root driving electrodes TX_N is correspondingRegion and display area followed by ", the output COUT of corresponding scanning circuit are height, according to fig. 2 truth table, driving electrodes TXOutput is determined by scanning switching switching signal TXSW.The corresponding region nth root driving electrodes TX_N, scanning switching switching signal TXSWFor scanning pulse, the output for gating output unit 20 is also scanning pulse；Display area, TXSW are low level low, and TX output isCommon level VCOM.
However, under certain abnormal conditions, when between DDIC and TPIC between communication abnormality or TPIC and FPC not yetStart to communicate or in the case that the non-burning of TPIC is used to store the firmware of program code, external scan driving signal EXVCOM1It may always be high level.In " the nth root corresponding region driving electrodes TX_N and display area " followed by, nth root is drivenMoving electrode TX_N output all for touch-control drive high level VTPH (generally in 5V or more), be no longer common level VCOM (generally-0.1V~-0.4V).If the corresponding region nth root driving electrodes TX_N is just crossed in display area, it is added in the pressure at liquid crystal both endsDifference significantly increases, the corresponding close white in display area.
Specifically, for full HD display screen (Full High Definition, FHD), resolution ratio 1080×1920.Assuming that TX in the display screen is 29, cannot be divided exactly by 29 due to 1920, so when public electrode divides, partDriving electrodes TX can occupy more line numbers.Assuming that first driving electrodes TX_1 and the 29th driving electrodes TX_29 crosses over 69 rows,Every driving electrodes TX in the 27 driving electrodes TX in centre crosses over 66 rows (69 × 2+66 × 27=1920).
Under 60Hz report point rate, a frame, which is shown, carries out a touch-control scanning in the time, and the touching of each TX is directed to comprising 29 timesControl scanning and 3 noise detectings.According to driver' s timing, display scanning and the touch-control for each TX scan (or noise detecting)It is alternately.The 29 touch-control scanning for each TX is equably inserted into a frame with 3 noises detectings and shows the timeIt is interior.1920/ (29+3)=60, every to have shown 60 rows, carrying out the 1 touch-control scanning for each TX, (or 1 noise is detectdIt surveys).
It is shown in Figure 4, keep driving circuit timing when high level singularly for external scan driving signal EXVCOM1Figure.It is shown in Figure 5, it is display area and the corresponding relationship of driving electrodes TX of touching display screen.
As shown in figure 5, display area 1 (corresponding 1~60 row) crosses over preceding 60 row in the region TX_1.At this point, as shown in Figure 4,TX_1 not yet starts to scan, and exports common level VCOM, and display is normal.
Since first driving electrodes TX_1 crosses over 69 rows, 9 rows fall in TX_1 before display area 2 (corresponding 60~120 rows)Region, behind 51 rows fall in the region TX_2.As shown in Figure 4, when showing preceding 9 row, TX_1 output is high (41 regions in such as Fig. 4),Display is abnormal, then the pressure difference for being added in liquid crystal both ends significantly increases, and is easy to cause liquid crystal polarization；When showing 51 row below, TX_2 is defeatedOut to be low, display is normal.
15 rows fall in the region TX_2 before display area 3 (corresponding 121~180 rows), behind 45 rows fall in the region TX_3.By scheming4 it is found that TX_2 output is high (42 regions in such as Fig. 4) when showing preceding 15 row, and display is abnormal；When showing 45 row below, TX_3 is defeatedOut to be low, display is normal.
And so on, when the touch-control scanning area before some display area and it has overlapping, overlapping region is shown justIt can be abnormal.The line number crossed over due to display area line number (60) and every driving electrodes TX (is end to end 69, centre is 66) not phaseDeng overlapping region is first gradually increased, and is gradually reduced later.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, it is intended to provide driving circuit and the side of a kind of touching display screenMethod, display screen and display comprising it, can guarantee the normal display of touching display screen.
In a first aspect, the embodiment of the present application provides a kind of driving circuit of touching display screen, for a frame periodIn be alternately performed display driving and touch-control driving；Driving circuit includes: scanning element, for exporting gate control signal；GatingOutput unit, the gate control signal for being exported according to scanning element sweep the driving electrodes of touching display screen step by stepIt retouches；And control unit, for controlling the output level of gating output unit, so that in display driving period, output level etc.In common level.
Second aspect, the embodiment of the present application also provides a kind of driving methods of touching display screen, comprising: scanning element is defeatedGate control signal out；The gate control signal that gating output unit is exported according to scanning element, the driving to touching display screenElectrode is scanned step by step；And the output level of control unit control gating output unit, so that in display driving period, it is defeatedLevel is equal to common level out.
The third aspect, the embodiment of the present application also provides a kind of touching display screen, including be oppositely arranged first substrate,Two substrates, and the liquid crystal layer being arranged between first substrate and the second substrate are provided with drive as described above on first substrateDynamic circuit.
Fourth aspect, the embodiment of the present application also provides a kind of displays, including touching display screen as described above.
Scheme provided by the embodiments of the present application, by making TX electrode, in low level, ensure that touch-control during displayDisplay screen is normally shown, prevents the polarization of liquid crystal molecule, extends the service life of touching display screen.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is otherFeature, objects and advantages will become more apparent upon:
Fig. 1 shows the schematic diagram of the driving electrodes driving circuit of existing touching display screen；
Fig. 2 shows in the driving electrodes driving circuit of the touching display screen of Fig. 1, the truth table of output unit is gated；
Fig. 3 shows the timing diagram of the driving electrodes driving circuit of the touching display screen of Fig. 1；
When Fig. 4 shows the EXVCOM1 in Fig. 3 and keeps high level singularly, the driving electrodes of the touching display screen of Fig. 1 are drivenThe timing diagram that dynamic circuit is respectively held；
Fig. 5 shows the corresponding relationship of display area and driving electrodes；
Fig. 6 shows the schematic diagram of the driving circuit of the touching display screen of the application first embodiment；
Fig. 7 is shown in the driving circuit of Fig. 6, gates the truth table of output unit；
When Fig. 8 shows EXVCOM1 and keeps high level singularly, the driving circuit of the touching display screen of the embodiment of the present applicationThe timing diagram respectively held；
When the scanning pulse that Fig. 9 shows EXVCOM1 extends to display driving period singularly, the touching of the embodiment of the present applicationThe timing diagram that the driving circuit of control display screen is respectively held；
Figure 10 shows the schematic diagram of the driving circuit of the touching display screen of the application second embodiment；
Figure 11 shows schematic structure of the driving circuit of the touching display screen of the embodiment of the present application in actual fabricationFigure；
Figure 12 shows the schematic flow chart of the driving method of the touching display screen of the embodiment of the present application.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouchedThe specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order toConvenient for description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phaseMutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 6 shows the schematic diagram 600 of the driving circuit of the touching display screen of the application first embodiment, the realityThe driving circuit for applying example can be used for being alternately performed display driving and touch-control driving in a frame period.
As shown in fig. 6, the driving circuit 600 of touching display screen includes scanning element 610 and gating output unit 620.
Scanning element 610 therein can be used for exporting gate control signal.Gating output unit 620 can be used for according to scanningThe gate control signal that unit 610 exports, scans driving electrodes TX_1~TX_N of touching display screen step by step.Control is singleMember 630 can be used for controlling the output level of gating output unit 620, so that the corresponding region of a certain driving electrodes TX_N is aobviousShow driving period, output level is equal to common level VCOM.
In some implementations, scanning element 610 may include more than two concatenated shift registers 611.Each displacementRegister 611 is based on scan clock signal SDCK1 or SDCK2 and is sequentially output gate control signal.
Gating output unit 620 may include that more than two gatings for being correspondingly connected with respectively with each shift register 611 are defeatedModule 621 out, each gating output module 621 are correspondingly connected with one in a driving electrodes TX_1~TX_N.
Gating output module 621 can be based on the gate control signal and control that shift register 611 connected to it exportsThe control signal that unit 630 exports is scanned driving electrodes TX_1~TX_N connected to it.
It is shown in Figure 7, it is that the gating in the driving circuit 600 of the touching display screen of the application first embodiment exports listThe truth table of member 620.
It can be seen from figure 7 that when common level gating switch signal VCOMSEL is low level (Low), driving electrodes TXOutput OUT is low level TXL.
It therefore, can be by the logic control of control unit 630, so that driving electrodes TX_1~TX_N is in display driving periodOutput level be common level VCOM, so, for example, can pass through setting common level gating switch signal VOMSELIt is connected in display driving period and common level, so that its output valve is low level, and is high level in touch-control driving period,So that driving electrodes TX_1~TX_N is similarly low level in display driving period, and then avoids and be input to gating outputWhen the level exception of unit 620, driving electrodes TX_1~TX_N generates abnormal level shown in 41 and 42 regions in Fig. 4.
For example, in application scenes, when external scan driving signal EXVCOM1 remains high level singularly,As shown in figure 8, it is low that driving electrodes TX_1~TX_N is still maintained in the output level of display driving period.
In other application scenarios, when the scanning pulse of external scan driving signal EXVCOM1 extend to singularly it is aobviousWhen showing driving period, as shown in figure 9, driving electrodes TX_1~TX_N display driving period output level still maintain forIt is low.
In order to realize level logic relationship as shown in Figure 7, so that gating output unit 620 is in the defeated of display driving periodOut level be equal to common level VCOM, in one implementation, control unit 630 can realize for door.
External scan driving signal VCOMSEL and scanning switching switching signal can be respectively connected to two input terminals of doorTXSW, output end are connected to the scanning switching switch input terminal of gating output unit 620, that is, gate the scanning of output unit 620Switch switching signal TXSW input terminal.
However, in practical applications, the realization with door has certain difficulty, thus, to realize the logic function with door,Cascade NAND gate and NOT gate can be used to replace and door.
Figure 10 shows the schematic diagram 1000 of the driving circuit of the touching display screen of the application second embodiment.
The difference of second embodiment and first embodiment is only that, in a second embodiment, passes through cascade NAND gate1031 and 1032 composition control unit 1030 of NOT gate, to replace first embodiment and door 630.
In the present embodiment, the input terminal of NAND gate 1031 receives external scan driving signal VCOMSEL and scanning respectivelySwitch switching signal TXSW, and the output end of NOT gate 1032 and the scanning switching switching signal TXSW of gating output unit 1020 are defeatedEnter end electrical connection.
Figure 11 shows schematic structure of the driving circuit of the touching display screen of the embodiment of the present application in actual fabricationFigure.
As previously mentioned, dual chip scheme usually can be used in the driving circuit of touching display screen, that is, it include display driver chip(DDIC) and touch chip (TPIC).Therefore, the driving circuit of the touching display screen of the embodiment of the present application can also include displayDriving unit 111.Display driver element 111 can be used for sending scan clock signal to scanning element 1110.
In some implementations, the control unit 1130 in the driving circuit of the touching display screen of the embodiment of the present application canTogether, to be set on panel (PANEL) 112 with scanning element 1110, gating output unit 1120.Alternatively, in other realitiesIn existing mode, the control unit 1130 in the driving circuit of the touching display screen of the embodiment of the present application can also be set to display and driveIn moving cell 111.
Figure 12 shows the schematic flow chart 1200 of the driving method of the touching display screen of the embodiment of the present application.
Specifically, in step 1210, scanning element exports gate control signal.Then, in step 1220, gateThe gate control signal that output unit is exported according to scanning element scans the driving electrodes of touching display screen step by step.It connects, in step 1230, the output level of control unit control gating output unit, so that in display driving period, output electricityEquality is in common level.
In some implementations, common level signal can be for example low level in display driving period, drive in touch-controlIt is high level during dynamic.
Disclosed herein as well is a kind of touching display screen, including be oppositely arranged first substrate, the second substrate, and settingLiquid crystal layer between first substrate and the second substrate.Wherein, it is provided with driving circuit as described above on the first substrate.
In some implementations of touching display screen, it may also include the driving for the first side being formed in the second substrateElectrode, driving electrodes can receive the output signal of driving circuit.Herein, the first side can be the second substrate one towards liquid crystal layerSide.
In some implementations, the touching display screen of the embodiment of the present application can also include be formed in the second substrate theSensing electrode on two sides, sensing electrode can be used for sensing the touch operation of outer bound pair touching display screen.Herein, second side withFirst side is opposite.For example, indium oxide layer tin (ITO) can be plated in second side of the second substrate as sensing electrode.
Disclosed herein as well is a kind of displays comprising touching display screen as described above.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the artMember is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristicScheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent featureAny combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed hereinCan technical characteristic replaced mutually and the technical solution that is formed.