CN103163666B - Liquid crystal indicator and scanning detection method thereof - Google Patents
Liquid crystal indicator and scanning detection method thereof Download PDFInfo
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- CN103163666B CN103163666B CN201110407593.XA CN201110407593A CN103163666B CN 103163666 B CN103163666 B CN 103163666B CN 201110407593 A CN201110407593 A CN 201110407593A CN 103163666 B CN103163666 B CN 103163666B
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Abstract
Present invention is disclosed a kind of liquid crystal indicator and scanning detection method thereof, solve by the Scanning Detction mode of a kind of point of sequential the impact that scanning gate signal rising edge and negative edge scan for touch control detection.A kind of mode comprises: among the grid scanning of described liquid crystal indicator, insert touch control detection scanning at least one times.By realizing with upper type the function integrating ASG, CTP in liquid crystal cell, avoid the mutual disturbance between signal, ensure that sensitivity and the resolution of touch control detection, therefore the thickness of whole liquid crystal panel, border width can be optimized improvement.Meanwhile, the present invention does not increase extra hardware and technique yet, can not cause harmful effect to cost and yield.
Description
Technical field
The present invention relates to liquid crystal indicator technical field, particularly relate to plane conversion (IPS) liquid crystal indicator and the scanning detection method thereof of the driving of a kind of integrated panel and capacitance touching control.
Background technology
In existing mobile display device, liquid crystal panel is more and more integrated with touch controllable function.Light, ultra-thin, visual angle is good, touch-control sensitive become the trend of present mobile communication equipment development.
CTP is the abbreviation of capacitance touch screen, is that the electric capacity by being formed between finger and touch pad electrode changes along with the change touching distance, finally causes the electric charge punching monitored to put the touch-control system judging touch location.Present a lot of CTP products are plug-in touch-control systems, are attached in LCD screen, between the two sometimes in order to the mutual interference of shielded signal also will add indium tin metal oxide (ITO) screen layer by CTP touch-screen.
With the organization plan of present plug-in capacitor screen, at least need 4 sheet glass: 2 sheet glass complete LCDs, 1 sheet glass makes capacitance touch screen electrode, and 1 sheet glass makes breakage-proof pressing glass (Cover Lens).If the ITO screen layer usually added between adding, too much interface layer can reduce the transmitance of light greatly, causes the reduction of display device brightness, power save properties.Meanwhile, 4 layers of glass also make the thickness of module greatly increase, and do not meet the demand that present device for mobile communication is thinning.In addition, CTP fits pattern due to binding yield problem (e.g., bubble, Mura, frangible etc.), also makes manufacturing cost greatly increase.Therefore, exploitation is integrated with the liquid crystal indicator of touch function, can improving performance and yield greatly.
But, as shown in Figure 1, due to the reason of detection mode, if directly CTP is produced on color film side, is driving the process of liquid crystal display can form electromagnetic interference (EMI) to capacitance plate, thus producing noise (Noise), affecting the detection for touching, forming the situation of wrong report point.Therefore design must be optimized to scanning and detection mode.In addition, consider the problems such as the thickness of border width and liquid crystal panel, need whole system is carried out redesigning and improveing, meet the user demand of its display and touch-control.
Summary of the invention
In view of this, the invention provides a kind of liquid crystal indicator and scanning detection method thereof, to solve the technical matters of touch control detection wrong report point.
For solving above technical matters, the invention provides a kind of scanning detection method of liquid crystal indicator, comprising: among the grid scanning of described liquid crystal indicator, insert touch control detection scanning at least one times.
Further, described insertion at least one times touch control detection scanning insert after the grid end of scan of each frame.
Further, among the grid scanning of each frame, touch control detection scanning is at least one times inserted.
Further, the mode inserting touch control detection scanning at least one times among the grid scanning of each frame is: after every several rows grid scanning, insert touch control detection scanning, until complete the scanning of these frame grid.
Further, when the sweep length of several rows grid scanning reaches 3mm-6mm, touch control detection scanning is inserted.
The present invention separately provides a kind of liquid crystal indicator, comprise: multistage grid drive amorphous silicon circuit, cascade successively, respond a clock signal or inverted clock signal, activate the gate line corresponding to it successively, wherein first order grid drive the amorphous silicon circuit lower work of beginning trigger pip driving together, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid; Touch control unit, couples described start trigger signal and afterbody grid drive amorphous silicon circuit, and outputs signal the trigger pip as the touch control detection end of scan and beginning using the grid that described start trigger signal and afterbody grid drive amorphous silicon circuit final.
Further, the grid output signal that described afterbody grid drive amorphous silicon circuit final is the scanning gate signal of vitual stage.
The present invention also provides a kind of liquid crystal indicator, comprise: multistage grid drive amorphous silicon circuit, cascade successively, respond a clock signal or inverted clock signal, activate the gate line corresponding to it successively, wherein first order grid drive the amorphous silicon circuit lower work of beginning trigger pip driving together, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid; Touch control unit, touch control detection scanning is at least one times inserted among the grid scanning of each frame, it is couple to grid corresponding to insertion position and drives amorphous silicon circuit, and drives the grid output signal of amorphous silicon circuit to start and the trigger pip terminated as touch control detection scanning using the grid of correspondence at least two-stage.
Further, the beginning of touch control detection scanning and the trigger pip at least one of end are the scanning gate signal of vitual stage.
Further, described touch control unit drives amorphous silicon circuit to be coupled to grid every some grades of grid and drives amorphous silicon circuit, and drives the grid output signal of amorphous silicon circuit to start and the trigger pip terminated as touch control detection scanning using the grid of correspondence at least two-stage.
Further, described touch control unit is coupled to grid driving amorphous silicon circuit every the grid sweep length of 3mm-6mm.
Visible, the present invention is by sequential separation scheme, achieve the function integrating ASG, CTP in liquid crystal cell, avoid the mutual disturbance between signal, ensure that sensitivity and the resolution of touch control detection, therefore the thickness of whole liquid crystal panel (containing TP function), border width can be optimized improvement.Meanwhile, the present invention does not increase extra hardware and technique yet, can not cause harmful effect to cost and yield.
Accompanying drawing explanation
Fig. 1 is the waveform schematic diagram of the scanning gate signal of a liquid crystal panel, noise signal and touch control detection sweep signal;
The scanning detection method of a kind of liquid crystal indicator that Fig. 2 provides for the embodiment of the present invention one;
Fig. 3 is a kind of structural representation of liquid crystal indicator;
The principle of work schematic diagram of a kind of liquid crystal indicator that Fig. 4 provides for the embodiment of the present invention one;
The scanning detection method of a kind of liquid crystal indicator that Fig. 5 provides for the embodiment of the present invention two;
The principle of work schematic diagram of a kind of liquid crystal indicator that Fig. 6 provides for the embodiment of the present invention two.
Embodiment
For above-mentioned feature and advantage of the present invention can be become apparent, exemplary embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
When touch control detection, often there is the situation of wrong report point in the existing liquid crystal indicator being integrated with touch function.Concrete reason please refer to Fig. 1, and is described below:
As shown in Figure 1, there is larger change (changing 25V within usual 1 μ s) in the rising edge of the scanning gate signal (signal of Gate shown in figure) of liquid crystal panel and negative edge voltage difference within the very short time, due to the impact of capacitive coupling and panel charging and discharging capabilities, the change of current potential can cause the change (particularly the current potential of public electrode (Common)) of other current potentials of panel, and causes a series of noise (Noise) to disturb thus.Because touch control detection (herein for the touch of capacitance touch screen CTP detects) is judged that by potential difference (PD) the modes such as electric charge discharge and recharge realize, so the wrong report point that the disturbance of public electrode level can cause touch-control to detect.
The present invention considers the existence of above problem, and in order to avoid the impact that scanning gate signal rising edge and negative edge scan for touch control detection, the Scanning Detction mode that have employed a kind of point of sequential solves above technical matters.Specifically please refer to following examples.It should be noted that, in following examples, touch control detection scanning is all for the detection of capacitance touch screen (CTP) scanning, but the present invention is not limited to this, and the Scanning Detction of other touch-screens all can use scanning detection method of the present invention.
Embodiment one:
Please refer to Fig. 2, the scanning detection method of its a kind of liquid crystal indicator provided for the embodiment of the present invention one.Its grid at each frame carry out touch control detection scanning (CTP detected) after scanning (gate scan), namely after the grid scanning of each hardwood, vacate one section of sequential to carry out touch control detection scanning.
The implementation method of the method in liquid crystal indicator is specifically described below in conjunction with Fig. 3 and Fig. 4.
It should be noted that, in order to the design requirement of narrow frame, integrated grid drive amorphous silicon circuit (ASG) to be important selection.Usual ASG circuit be all utilize clock signal C K, inverted clock signal CKB, start trigger signal STV, the rising edge of level signal such as upper level grid output signal Gaten etc., negative edge to modulate high level voltage VGH, low level voltage VGL makes to export grid sweep waveform at the corresponding levels.Wherein, STV is start trigger signal, which determines the work of the ASG circuit of the first order, and then is handed on by circuit one-level one-level.Because amorphous silicon electron mobility is lower, therefore need the thin film transistor (TFT) (TFT) of very large breadth length ratio to make afterbody output circuit, in the panel area that ASG circuit takies, proportion is maximum.
First, as shown in Figure 3, it is a kind of structural representation of liquid crystal indicator.As shown in the figure, this liquid crystal indicator comprises multistage grid driving amorphous silicon circuit (ASG) 100, display unit 200 and touch control unit 300.Wherein, multistage grid drive amorphous silicon circuit cascade successively, respond a clock signal CK or inverted clock signal CKB, activate the gate line corresponding to it successively, wherein first order grid drive amorphous silicon circuit to work under the driving of start trigger signal STV, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid; Touch control unit 300 couples start trigger signal STV and afterbody grid drive amorphous silicon circuit, and using start trigger signal STV as the trigger pip of the touch control detection end of scan, scan using the grid output signal that afterbody grid drive amorphous silicon circuit final the trigger pip started as touch control detection.
In addition, display unit 200 often comprises many gate lines, data line and multiple pixel, each pixel is made up of thin film transistor (TFT) and liquid crystal capacitor, and data drive circuit exports data-signal to data line, and ASG circuit exports gate drive signal to gate line.Due to the technology that this is well known to those skilled in the art, therefore do not describe in detail at this.
Below in conjunction with Fig. 4, describe the principle of work of above liquid crystal indicator in detail.When integrated circuit (IC) exports start trigger signal STV, touch control unit 300 receives STV signal, and this STV signal effective time stop for touch-control scanning, and ASG circuit is started working, export scanning gate signal step by step, to the last one-level exports gate signal effectively (such as, being high level).The touch control procedure that these afterbody grid output signal triggers in touch control unit 300 starts to scan, until IC exports STV signal effectively when next hardwood starts, and so forth.Thus, the function of point sequential grid scanning and touch control detection scanning is just achieved.
Preferably, the grid output signal that afterbody ASG circuit is final is the scanning gate signal of vitual stage (Dummy).This is because the scanning gate signal of Dummy level is not input in liquid crystal panel, so there is not the situation of overlap capacitance coupled level, its rising edge, negative edge also can not impact touch control detection scanning.Simultaneously, ASG circuit as Dummy level inputs owing to not needing to make, only need afterbody ASG circuit design as exporting Dummy sweep signal, therefore the TFT circuit of very large breadth length ratio is not needed, therefore the ASG as Dummy level can save a lot of panel area, can not cause harmful effect to border width.
Embodiment two:
Please refer to Fig. 5, the scanning detection method of its a kind of liquid crystal indicator provided for the embodiment of the present invention two.Its grid at each frame scan among (gate scan) and insert touch control detection scanning (CTPdetected) at least one times.Usual inserted mode is: after every several rows grid scanning, insert touch control detection scanning, until complete the scanning of these frame grid.At this, do not limit the number of times inserting touch-control scanning, those skilled in the art can set as required.But through experiment and analysis, preferably, when the sweep length of several rows grid scanning reaches 5mm, insert touch control detection scanning.Such as, corresponding touch-control spacing, the corresponding 30 row grid scanning left and right of general 5mm, insert touch-control scanning, carry out grid scanning again, and so forth until complete scanning and the detection of whole screen after completing.Meanwhile, through inventor's repetition test, find, when the sweep length of several rows grid scanning is between 3mm-6mm, inserts touch control detection scanning and all can realize good touch control detection effect.
The implementation method of the method in liquid crystal indicator is specifically described below in conjunction with Fig. 3, Fig. 6.
This liquid crystal indicator comprises multistage ASG circuit 100, display unit (not shown) and touch control unit 400.Wherein, the cascade successively of multistage ASG circuit, respond a clock signal CK or inverted clock signal CKB, activate the gate line corresponding to it successively, wherein first order grid drive amorphous silicon circuit to work under the driving of start trigger signal STV, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid.Itself and embodiment one difference are setting and the principle of work of touch control unit 400.As Fig. 6, this touch control unit 400 inserts touch control detection scanning at least one times among the grid scanning of each frame, it is couple to one-level grid corresponding to insertion position and drives amorphous silicon circuit, and using the trigger pip that this grade of grid drive the initial grid output signal of amorphous silicon circuit to start as touch control detection scanning, and when needs terminate touch control detection scanning, drive the trigger pip of grid output signal as the touch control detection end of scan of amorphous silicon circuit using the grid of respective stages.Usually, touch control detection scans corresponding 3-5 level grid and drives amorphous silicon circuit.Visible, the present embodiment utilizes the grid of respective stages to output signal and drives to realize grid the object scanning and be separated with touch-control scanning sequence with the trigger pip terminating touch-control scanning as starting touch-control scanning.
Preferably, utilize the Dummy level scanning gate signal of ASG circuit to realize above function equally, namely when needs insert touch control detection, this grade of ASG circuit design is scanned trigger pip for exporting Dummy, using the trigger pip scanned as touch control detection, in the process of touch control detection, some grades of corresponding ASG circuit export several Dummy signals, when needs terminate touch control detection, this grade of ASG circuit design is for exporting Dummy end of scan signal, to terminate touch control detection scanning, and start grid scanning at next stage ASG circuit, design herein exports Dummy signal, Dummy scans the advantage of trigger pip and Dummy end of scan signal with embodiment one, do not repeat them here.
As can be seen from the figure, touch control unit drives amorphous silicon circuit to couple grid every some grades of grid and drives amorphous silicon circuit, and drives the grid output signal of the respective stages of amorphous silicon circuit to start and the trigger pip terminated as touch control detection scanning using its these grid.Preferably, touch control unit couples a grid driving amorphous silicon circuit every the grid sweep length of 5mm, and preferably, touch control unit is coupled to grid driving amorphous silicon circuit every the grid sweep length of 3mm-6mm.
Embodiment one vacates one section of sequential to carry out touch control detection scanning after the grid scanning of each hardwood.This mode simply easily realizes, and does not especially have extra requirement to ASG circuit design, can realize reducing costs, and improves the object of product yield.Embodiment two inserts touch control detection scanning after the scanning of several rows grid, carries out grid scanning again, and so forth until complete scanning and the detection of whole screen after completing.The method can greatly improve panel touch-control response speed and resolution.
It should be noted that, the invention provides two kinds of sequential separation schemes, also can carry out combination for two schemes and design.Meanwhile, this design also can be used in the separation of plug-in capacitor screen sequential, is used in outer hanging panel and is driven situation about having a strong impact on by grid.
In sum, the liquid crystal panel and the driving integration technology that have touch controllable function in conjunction with CTP, ASG fabrication techniques high-quality is embodiments provided.Avoiding liquid crystal panel and contact panel owing to being produced on mutual interference that in liquid crystal cell, large stray capacitance causes the particularly noise that is coupled out of grid scanning rising edge, negative edge, utilize the existing signal of ASG circuit, under the prerequisite not increasing hardware block, to scanning the differentiation carried out in sequential, avoid mutual interference.Design mainly for sequential circuit logic and system combination, optimize Effect on Detecting.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand; the present invention is not restricted to the described embodiments; the just principle of the present invention described in above-described embodiment and instructions; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in claimed scope of the present invention.The protection domain of application claims is defined by appending claims and equivalent thereof.
Claims (6)
1. a liquid crystal indicator, is characterized in that, comprising:
Multistage grid drive amorphous silicon circuit, cascade successively, respond a clock signal or inverted clock signal, activate the gate line corresponding to it successively, wherein first order grid drive the amorphous silicon circuit lower work of beginning trigger pip driving together, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid;
Touch control unit, couples described start trigger signal and afterbody grid drive amorphous silicon circuit, and outputs signal the trigger pip as the touch control detection end of scan and beginning using the grid that described start trigger signal and afterbody grid drive amorphous silicon circuit final.
2. liquid crystal indicator according to claim 1, is characterized in that, the grid output signal that described afterbody grid drive amorphous silicon circuit final is the scanning gate signal of vitual stage.
3. a liquid crystal indicator, is characterized in that, comprising:
Multistage grid drive amorphous silicon circuit, cascade successively, respond a clock signal or inverted clock signal, activate the gate line corresponding to it successively, wherein first order grid drive the amorphous silicon circuit lower work of beginning trigger pip driving together, work under other grade of grid drive amorphous silicon circuit to drive the driving of the output signal of amorphous silicon circuit successively at upper level grid;
Touch control unit, touch control detection scanning is at least one times inserted among the grid scanning of each frame, it is couple to grid corresponding to insertion position and drives amorphous silicon circuit, and drives the grid output signal of amorphous silicon circuit to start and the trigger pip terminated as touch control detection scanning using the grid of correspondence at least two-stage.
4. liquid crystal indicator according to claim 3, is characterized in that, the beginning of touch control detection scanning and the trigger pip at least one of end are the scanning gate signal of vitual stage.
5. liquid crystal indicator according to claim 3, it is characterized in that, described touch control unit drives amorphous silicon circuit to be coupled to grid every some grades of grid and drives amorphous silicon circuit, and drives the grid output signal of amorphous silicon circuit to start and the trigger pip terminated as touch control detection scanning using the grid of correspondence at least two-stage.
6. the scanning detection method of liquid crystal indicator according to claim 5, is characterized in that, described touch control unit is coupled to grid driving amorphous silicon circuit every the grid sweep length of 3mm-6mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108922464A (en) * | 2018-08-10 | 2018-11-30 | 苏州噜噜猫软件科技有限公司 | Liquid crystal display device and its scanning detection method |
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| CN103412672A (en) * | 2013-07-17 | 2013-11-27 | 北京京东方光电科技有限公司 | Touch display device and driving method thereof |
| KR102088421B1 (en) * | 2013-08-01 | 2020-03-13 | 삼성디스플레이 주식회사 | Liquid crystal display device integrated touch sensor |
| CN104992684A (en) * | 2015-07-07 | 2015-10-21 | 武汉华星光电技术有限公司 | Display used for controlling gate drive timing sequence and corresponding control method |
| CN105117069B (en) * | 2015-09-18 | 2018-11-09 | 上海中航光电子有限公司 | A kind of array substrate, touch-control display panel and touch control display apparatus |
| CN105427789B (en) * | 2015-12-31 | 2019-05-03 | 上海天马微电子有限公司 | Driving circuit, array substrate and display device |
| CN114093329B (en) | 2020-07-31 | 2023-05-23 | 京东方科技集团股份有限公司 | Driving method and driving device of display panel and display device |
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