CN101866241A - Method for reducing noise for touch panel - Google Patents
Method for reducing noise for touch panel Download PDFInfo
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- CN101866241A CN101866241A CN 201010212214 CN201010212214A CN101866241A CN 101866241 A CN101866241 A CN 101866241A CN 201010212214 CN201010212214 CN 201010212214 CN 201010212214 A CN201010212214 A CN 201010212214A CN 101866241 A CN101866241 A CN 101866241A
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Abstract
The invention discloses a method for reducing noise for a touch panel, comprising the following steps: during a test process of the displayer, taking a synchronous reference signal, and searching out a signal emergence time point with the minimum noise by taking the initial point of the synchronous reference signal as a reference, thus noise interference resulted from data coupling of data lines can be avoided for detection of judgment of a touch instruction on the touch panel at any time in other relative tests of the displayer or the application process of users.
Description
Technical field
The present invention relates to a kind of method that reduces noise for touch panel, especially refer to a kind of by the signal on the contact panel is taken a sample, and and then find out time point and decide the best of the electric capacity on the contact panel to discharge and recharge the time with minimal noise, to reduce the method for noise on the contact panel.
Background technology
See also Fig. 1, it is for generally having the simple synoptic diagram of part of a display 100 of contact panel.As shown in Figure 1, display 100 comprises a contact panel 110 and a display panel 120.Display 100 has been covered with gate line (not illustrating) and data line (for example illustrated data line D1 of Fig. 1, D2, D3, D4) with matrix-style on the display panel 120, so that can be tackled the clock pulse signal that transmits in gate line and data line institute data signals transmitted in display panel 120 display pixel data.Contact panel 110 itself has electric capacity, and by the capacitance variation on the induction contact panel 110, display 100 can know on the contact panel 110 accurately by the position that the user triggered, and then various single-point touch instructions or the multi-point touch instruction differentiating the user according to this and triggered.Yet, owing between contact panel 110 and the display panel 120 very easily because between the two coupling capacitance (capacitor C 1, C2, C3 for example shown in Figure 1) produces data be coupled (Data Coupling), therefore institute's data signals transmitted can be disturbed with the form generation of noise the capacitance detecting of being carried out on the contact panel 110 on the data line, and has influence on the accuracy of display 100 when the differentiation of implementing the touch-control instruction or the demonstration of pixel data.If in order to avoid the coupling of this kind data, the time that the detection frequency that detects capacitance on the contact panel 110 is reduced to avoid the data line transmission of data signals can be feasible way originally, yet contact panel can't be instructed by the instant 110 induction touch-controls that the user triggered.
Summary of the invention
The present invention discloses a kind of method that reduces noise for touch panel.This method comprises (a) by determining a synchronous reference signal in the employed at least a clock pulse signal on the display panel; (b) in one first schedule time, with the inductor of a contact panel on a pairing test position on this display panel, this test position is carried out a sample of signal, to produce a sampled signal; (c) determine a maximum sampled signal of intensity maximum in these a plurality of sampled signals and a minimum sample signal of intensity minimum; (d) determine the intensity difference of this maximum sampled signal and this minimum sample signal, to produce a noise estimating signal; (e) intensity of the intensity of this noise estimating signal and an existing minimal noise estimating signal relatively, and determine the intensity of this existing minimal noise estimating signal according to comparative result; (f) correspond to the phase differential of this synchronizing datum signal and the time of occurrence point of this synchronizing datum signal according to this existing minimal noise estimating signal, determine and write down the time of occurrence point of this existing minimal noise estimating signal; (g) it is a time interval with one second schedule time, execution in step (b), (c), (d), (e), (f) once more, till one the 3rd schedule time finished, wherein the 3rd schedule time was contained a plurality of these first schedule times and a plurality of this second schedule time; And, drive many data lines of this display panel, to transfer data on this display panel (h) according to the time of occurrence point of this synchronizing datum signal with present this existing minimal noise estimating signal that writes down.
Description of drawings
Fig. 1 is for generally having the simple synoptic diagram of part of a display of contact panel;
Fig. 2 discloses the process flow diagram that reduces the method for noise on the contact panel for the present invention;
The sequential synoptic diagram that Fig. 3 carries out sample of signal when implementing the described step of Fig. 2, wherein transverse axis is represented the time, and the intensity of vertical axis represent signal;
Fig. 4 is the sequential chart of employed various clock pulse signals on the display panel shown in Figure 1.
Wherein, Reference numeral
100 displays
110 contact panels
120 display panels
D1, D2, D3, D4 data line
C1, C2, C3 electric capacity
The 202-222 step
T1, t2, t3, t_delay, t_min time
S_min, s_max signal
Err noise estimating signal
YCLK gate line clock pulse signal
YOE gate line switching signal
Signal is adjusted at the YV1C edge
The XPOL polarity inversion signal
XSTB data write control signal
Embodiment
In order to solve the problem that the data coupling influence between the contact panel and display panel in the above-mentioned prior art shows at touch-control command detection or pixel data to display, the present invention discloses a kind of by the signal on the contact panel is taken a sample, and and then find out time point and decide the best of the electric capacity on the contact panel to discharge and recharge the time with minimal noise, to reduce the method for noise on the contact panel.
See also Fig. 2, it is the process flow diagram of the method for noise on the disclosed reduction contact panel of the present invention.As shown in Figure 2, to comprise step as follows for the method disclosed in the present:
Step 202: by determining a synchronous reference signal in the employed at least a clock pulse signal on the display panel, and execution in step 204;
Step 204: in one first schedule time,, this test position is carried out a sample of signal with the inductor of a contact panel on a pairing test position on this display panel, producing a sampled signal, and execution in step 206;
Step 206: determine in this first schedule time a maximum sampled signal of intensity maximum and a minimum sample signal of intensity minimum at present sampled a plurality of sampled signals, and execution in step 208;
Step 208: determine whether this first schedule time finishes; When this first schedule time has finished, execution in step 210, otherwise execution in step 204;
Step 210: determine the intensity difference of this maximum sampled signal and this minimum sample signal, producing a noise estimating signal, and execution in step 212;
Step 212: the intensity of the intensity of this noise estimating signal and an existing minimal noise estimating signal relatively, and determine the intensity of this existing minimal noise estimating signal according to comparative result; When the intensity of this noise estimating signal is lower than the intensity of this existing minimal noise estimating signal, execution in step 214, otherwise execution in step 216;
Step 214: the intensity that the intensity of this noise estimating signal is updated to this existing minimal noise estimating signal, and this noise estimating signal corresponded to the phase differential of this synchronizing datum signal and the time of occurrence point of this synchronizing datum signal, determine and be recorded as the time of occurrence point of this existing minimal noise estimating signal;
Step 216: waited for for one second schedule time, and execution in step 218;
Step 218: confirm whether one the 3rd schedule time finished, wherein the 3rd schedule time was contained a plurality of these first schedule times and a plurality of this second schedule time; When the 3rd schedule time finished, execution in step 220, otherwise execution in step 204;
Step 220:, drive many data lines of this display panel, to transfer data on this display panel according to the time of occurrence point of this synchronizing datum signal with present this existing minimal noise estimating signal that writes down.
For the described step of clear interpretation Fig. 2, please consult Fig. 3 simultaneously.The sequential synoptic diagram that Fig. 3 carries out sample of signal when implementing the described step of Fig. 2, wherein transverse axis is represented the time, and the intensity of vertical axis represent signal.Fig. 3 represents an inductor detected signal intensity of contact panel 110 on pairing test position on the display panel 120, and the described step of Fig. 2 is with the reference of this signal intensity as judgement noise size.
Application drawing 2 described methods are when display 100 shown in Figure 1, in step 202, need go out the time point t_min (as shown in Figure 3) of a noise minimum at one section set time build-in test, with as after driving data lines with transfer data to standard time point on the display panel, time t3 shown in Figure 3 is this section set time.Yet, the start time point of time t3 also needs decision in advance, to find out the phase differential t_delay between this starting point and the time point t_min, and after actual when starting display 100, as long as can learn start time point and the phase differential t_delay of time t3, just can estimate the position of time point t_min on time shaft of representing the noise minimum.The start time point of time t3 is by finding a synchronizing datum signal to decide in different types of clock pulse signal on the display panel 120, and test meeting is afterwards carried out as starting point with this synchronizing datum signal.See also Fig. 4, it is the sequential chart of employed various clock pulse signals on the display panel 120 shown in Figure 1.Fig. 4 figure is shown with a gate line clock pulse signal YCLK, a gate line switching signal YOE, edge adjustment signal YV1C, a polarity inversion signal XPOL, reaches the sequential of a data write control signal XSTB, and wherein each signal is only represented its activation/disabled state with high electronegative potential.Gate line clock pulse signal YCLK represents the employed time clock of each gate line on the display panel 120, and whether gate line switching signal YOE is used for control gate line clock pulse signal YCLK effective to the triggering of gate line, in other words, when gate line clock pulse signal YCLK and gate line control signal YOE were enabled simultaneously, the gate line on the display panel 120 can be triggered and start.Polarity inversion signal XPOL is used for controlling and takes advantage of the light emitting diode that carries on the display panel 120, to implement the reversal of poles of display panel 120.Data write control signal XSTB is used for controlling the sequential that data line is unlocked on the display panel 120, writes with the pixel data that carries out on the display panel 120.Observe Fig. 4 as can be known, has different phase differential between each clock pulse signal, if can not also determine the starting point of time t3 according to this as synchronizing datum signal, also can't be used for the running of display 100 to reduce noise even then known the size of phase differential t_delay with one of them clock pulse signal.In a preferred embodiment of the present invention, as shown in Figure 4, adjust among the signal YC1C one period that is not enabled (that is dutycycle (Duty Cycle)) as time t3 shown in Figure 3 with the edge.
Step 204-208 is corresponding to time t1 shown in Figure 3, and time t1 is as the sample of signal time to single test position on the contact panel 110.As shown in Figure 3, can carry out sample of signal in time t1 with the inductor corresponding to a fc-specific test FC position on the display panel 120 on the contact panel 110, to obtain a plurality of discrete sampled signals (four signals being contained as time t1 among Fig. 3).In step 206, can be by finding out a signal of signal intensity maximum and a signal of signal intensity minimum in a plurality of signals of in time t1, having taken a sample at present (may not be all four signals of being contained among Fig. 3 as yet).In step 208, when time t1 has finished, that is time t1 shown in Figure 3 contained all sampled the finishing of four signals the time, just can determine the signal s_max of intensity maximum in this four signals as shown in Figure 3 and the signal s_min of intensity minimum.
In step 210, intensity difference between signal s_max and the s_min can be decided to be a noise estimating signal err, is used for being used as the representative noise of the signal group that time t1 as shown in Figure 3 contained (that is set of four signals containing of time t1 shown in Figure 3).General situation before execution in step 212 is a display 100 at the existing noise estimating signal err that has collected in a plurality of above-mentioned signal group separately, and be used as an existing minimal noise estimating signal by the noise estimating signal err that has wherein found out the signal intensity minimum, and the state of this existing minimal noise estimating signal before time t3 finishes is variable (variable).Thus, when obtaining a new noise estimating signal err after the execution of step 210 again, in step 212, noise estimating signal that can this is new compares with the signal intensity of this existing minimal noise estimating signal.The signal intensity that shows new noise estimating signal err when comparative result is during less than this existing minimal noise estimating signal, can be in step 214 will this existing minimal noise estimating signal relevant information be updated to the relevant information of new noise estimating signal err, intensity that for example will this existing minimal noise estimating signal and corresponding phase differential t_delay are updated to the intensity of new noise estimating signal err and its and correspond to mistiming (that is phase differential) between the time t3 starting point etc.Otherwise, the signal intensity that shows new noise estimating signal err when comparative result is not during less than this existing minimal noise estimating signal, then keep the relevant information of this existing minimal noise estimating signal, for example keep the intensity of this existing minimal noise estimating signal and correspond to the phase differential of this synchronizing datum signal.
Observing Fig. 3 as can be known, in the present invention, can be that unit takes a sample with signal group at the same test position on the contact panel 110, and the set time t2 of can being separated by between the signal group; This second schedule time of the described wait of step 216 is time t2 shown in Figure 3, and whether no matter is sampled to new noise estimating signal err less than existing minimal noise estimating signal in step 212, and t2 as shown in Figure 3 all can wait for a period of time.Observe Fig. 3 as can be known, time t3 has been contained a plurality of time t1 and t2, and under general situation, the length of time t1 can be much smaller than the time span of time t2.Can determine in step 218 whether time t3 finishes, whether stop sampling this test position on the contact panel 110 with decision.When time t3 does not finish as yet, i.e. representative need be proceeded sampling to this test position, and execution in step 202, otherwise then represent the relevant information (for example time of occurrence point) that has obtained existing minimal noise estimating signal on this test position at present, and execution in step 220.When step 220 representative finishes or carries out follow-up performance test in display 100 manufacturings afterwards, can drive the electric capacity on the contact panel 110 according to the time of occurrence point of present resultant existing minimal noise estimating signal, under the prerequisite of estimation noise minimum, contact panel 110 is discharged and recharged, and the noise of avoiding data coupling as described in the prior art that contact panel is brought whereby, to reduce the noise on the contact panel, improve the accuracy of contact panel when detecting the touch-control instruction.
Note that time t2 shown in Figure 3 and t3 can according to the default settings in technology or the test or user buy behind the display 100 set up on their own determine that and the length of time t1 is much smaller than time t2, to carry out intensive sample of signal in the short time at one section utmost point.
The present invention discloses a kind of method that reduces noise on the contact panel.In the method disclosed in the present, get a fixed synchronous reference signal, and the epoch point that is as the criterion and in test process, finds out the noise minimum with the starting point of this synchronizing datum signal, with after can avoid the noise that the data coupling of data line brings in other dependence tests of display or user's the use at any time and interfere with the detection and the judgement of touch-control instruction on the contact panel.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (5)
1. a method that reduces noise for touch panel is characterized in that, comprises:
(a) by determining a synchronous reference signal in the employed at least a clock pulse signal on the display panel;
(b) in one first schedule time, with the inductor of a contact panel on a pairing test position on this display panel, this test position is carried out a sample of signal, to produce a sampled signal;
(c) determine a maximum sampled signal of intensity maximum in these a plurality of sampled signals and a minimum sample signal of intensity minimum;
(d) determine the intensity difference of this maximum sampled signal and this minimum sample signal, to produce a noise estimating signal;
(e) intensity of the intensity of this noise estimating signal and an existing minimal noise estimating signal relatively, and determine the intensity of this existing minimal noise estimating signal according to comparative result;
(f) correspond to the phase differential of this synchronizing datum signal and the time of occurrence point of this synchronizing datum signal according to this existing minimal noise estimating signal, determine and write down the time of occurrence point of this existing minimal noise estimating signal;
(g) it is a time interval with one second schedule time, execution in step (b), (c), (d), (e), (f) once more, till one the 3rd schedule time finished, wherein the 3rd schedule time was contained a plurality of these first schedule times and a plurality of this second schedule time; And
(h), drive many data lines of this display panel, to transfer data on this display panel according to the time of occurrence point of this synchronizing datum signal with present this existing minimal noise estimating signal that writes down.
2. method according to claim 1 is characterized in that, step (e) comprises:
When the intensity of this noise estimating signal is lower than the intensity of this existing minimal noise estimating signal, the intensity of this existing minimal noise estimating signal is updated to the intensity of this noise estimating signal; And
The phase differential that this noise estimating signal is corresponded to this synchronizing datum signal is recorded as the phase differential that this existing minimal noise estimating signal corresponds to this synchronizing datum signal.
3. method according to claim 1 is characterized in that, step (e) comprises:
When the intensity of this noise estimating signal is not lower than the intensity of this existing minimal noise estimating signal, keeps the intensity of this this existing minimal noise estimating signal and correspond to the phase differential of this synchronizing datum signal.
4. method according to claim 1 is characterized in that,
Wherein this at least a clock pulse signal comprises an edge and adjusts signal, and the sequential that data line that signal is used for adjusting these display panel both sides reads is adjusted at this edge, with prevent and the central area of this display panel between the time for reading of data line poor;
Wherein step (a) comprises:
It is this synchronizing datum signal that signal deciding is adjusted at this edge;
Wherein the length of the 3rd schedule time determines according to a dutycycle of this edge adjustment signal.
5. method according to claim 1 is characterized in that, the time span of this second schedule time and the 3rd schedule time determines according to a default settings and/or a user's setting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102122147A CN101866241B (en) | 2010-06-22 | 2010-06-22 | Method for reducing noise for touch panel |
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| CN2010102122147A CN101866241B (en) | 2010-06-22 | 2010-06-22 | Method for reducing noise for touch panel |
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| CN101866241B CN101866241B (en) | 2012-06-27 |
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| CN2010102122147A Expired - Fee Related CN101866241B (en) | 2010-06-22 | 2010-06-22 | Method for reducing noise for touch panel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221934A (en) * | 2011-05-17 | 2011-10-19 | 友达光电股份有限公司 | Touch display device and method for reading touch signal thereof |
| CN103914166A (en) * | 2013-01-08 | 2014-07-09 | 东莞万士达液晶显示器有限公司 | Touch panel and driving method thereof |
| TWI506518B (en) * | 2012-08-07 | 2015-11-01 | Japan Display Inc | Display device with touch sensor, and electronic apparatus |
| CN106814905A (en) * | 2016-09-01 | 2017-06-09 | 友达光电股份有限公司 | Time schedule controller and noise suppression method of touch panel |
| CN106886327A (en) * | 2012-07-27 | 2017-06-23 | 禾瑞亚科技股份有限公司 | The measuring signal method and apparatus of touch-screen |
| CN109324717A (en) * | 2018-11-14 | 2019-02-12 | 友达光电股份有限公司 | Touch display device and touch driving method |
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| US6657610B1 (en) * | 1999-03-15 | 2003-12-02 | Seiko Epson Corporation | Liquid-crystal display device and method of driving the same |
| CN101488065A (en) * | 2009-03-09 | 2009-07-22 | 友达光电股份有限公司 | Touch control detection method |
| CN101639743A (en) * | 2009-07-06 | 2010-02-03 | 友达光电股份有限公司 | Touch-control detection method |
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2010
- 2010-06-22 CN CN2010102122147A patent/CN101866241B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6657610B1 (en) * | 1999-03-15 | 2003-12-02 | Seiko Epson Corporation | Liquid-crystal display device and method of driving the same |
| CN101488065A (en) * | 2009-03-09 | 2009-07-22 | 友达光电股份有限公司 | Touch control detection method |
| CN101639743A (en) * | 2009-07-06 | 2010-02-03 | 友达光电股份有限公司 | Touch-control detection method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221934A (en) * | 2011-05-17 | 2011-10-19 | 友达光电股份有限公司 | Touch display device and method for reading touch signal thereof |
| CN106886327A (en) * | 2012-07-27 | 2017-06-23 | 禾瑞亚科技股份有限公司 | The measuring signal method and apparatus of touch-screen |
| TWI506518B (en) * | 2012-08-07 | 2015-11-01 | Japan Display Inc | Display device with touch sensor, and electronic apparatus |
| CN103914166A (en) * | 2013-01-08 | 2014-07-09 | 东莞万士达液晶显示器有限公司 | Touch panel and driving method thereof |
| CN106814905A (en) * | 2016-09-01 | 2017-06-09 | 友达光电股份有限公司 | Time schedule controller and noise suppression method of touch panel |
| CN109324717A (en) * | 2018-11-14 | 2019-02-12 | 友达光电股份有限公司 | Touch display device and touch driving method |
| CN109324717B (en) * | 2018-11-14 | 2022-03-29 | 友达光电股份有限公司 | Touch display device and touch driving method |
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| CN101866241B (en) | 2012-06-27 |
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