CN102097064B - Method and system for controlling scanning pause and reply of liquid crystal display - Google Patents
Method and system for controlling scanning pause and reply of liquid crystal display Download PDFInfo
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- CN102097064B CN102097064B CN 200910259008 CN200910259008A CN102097064B CN 102097064 B CN102097064 B CN 102097064B CN 200910259008 CN200910259008 CN 200910259008 CN 200910259008 A CN200910259008 A CN 200910259008A CN 102097064 B CN102097064 B CN 102097064B
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Abstract
The invention discloses a method and a system for controlling scanning pause and reply of a liquid crystal display. The method comprises the following steps of: monitoring a video source, and recording current scanning line position and corresponding polarity; when an abnormal video source is detected, stopping scanning of a liquid crystal panel from the pause scanning line of a pause frame, wherein the pause scanning position corresponds to a pause polarity; when a normal video source is detected, determining a reply scanning line or/and a reply polarity; replying the scanning of the liquid crystal panel from the reply scanning line, wherein the replying position is as same as the pause scanning line; or/and when the reply polarity is matched with the pause polarity, performing reply.
Description
Technical field
The present invention relates to liquid crystal display, particularly relate to the system and method that a kind of scanning of controlling liquid crystal display suspends and replys.
Background technology
Liquid crystal display generally is used in televisor and various electronic installation.Characteristic according to liquid crystal molecule; usually can be in fixed intervals; for example each frame (frame), every delegation, each row or each pixel; use reversal of poles (polarity inversion) mechanism to change the direction of electric field, make electric polarity to be changed in each frame, every delegation, each row or each pixel.Fig. 1 shows two consecutive frames that use row counter-rotatings (row inversion).In frame N, the polarity of first row is just "+", that the polarity of secondary series becomes is negative " ", by that analogy.In frame N+1, the polarity of first row is negative "-", and it is in contrast to the first row polarity of former frame N.
In television broadcasting or general electronic communication, usually can be subject to the impact of noise or interference.After liquid crystal TV set receives this noise, can cause onlooker's interference.The 4th row that Fig. 2 is illustrated in frame N are subject to the interference of noise, thereby suspend the demonstration of remaining columns.After interrupting reply, frame N+1 namely begins to show from first row.It should be noted that the last display column (that is, the 3rd row) of frame N and next row that continue of frame N+1 (that is the 4th is listed as) have identical polarity "+", as arrow indication in figure, this kind situation can allow the onlooker feel flicker.
In view of conventional liquid crystal can't be replied effectively from the interruption that noise causes, therefore need badly and propose a kind of novel mechanism, in order to flicker or other interference of avoiding causing because of Recovery Process, and promoted the quality that video signal shows.
Summary of the invention
In view of above-mentioned, one of purpose of the embodiment of the present invention is to propose the system and method that a kind of scanning of controlling liquid crystal display suspends and replys, and makes the Recovery Process of interruption can be more steady or continuous, to reduce or to avoid flicker.
According to the embodiment of the present invention, the video signal source that monitors to be detecting the abnormal of video signal source, and records current scanline line position and corresponding polarity.When detecting when abnormal, i.e. the scanning of stop solution crystal panel, wherein the liquid crystal panel position that begins to stop scanning is defined as one and suspends sweep trace, and its corresponding polarity is defined as one and suspends polarity, and corresponding frame definition is a pause frame.When the video signal source to be detected be normal, namely determine one of following parameters or reply sweep traces at two: one, its position is same as the time-out sweep trace; Reach one and reply polarity, it makes the polarity of replying frame be same as the polarity of pause frame.According to one of following condition or two scannings with the reply liquid crystal panel: reply in replying the sweep trace place; And the polarities match of working as the reply frame is replied in the polarity chron of pause frame.
Description of drawings
Fig. 1 shows two consecutive frames that use the row counter-rotating.
Fig. 2 is illustrated in the interference that frame N is subject to noise, and replys from interruption in frame N+1.
Fig. 3 shows the functional block diagram of liquid crystal display.
The functional block diagram of Fig. 4 shows that the scanning of controlling liquid crystal display suspends and the system of reply.
The process flow diagram of Fig. 5 shows that the scanning of controlling liquid crystal display suspends and the method for reply.
The sequential chart of Fig. 6 A view similar, it has shown start signal STV and output enable signal OE.
Fig. 6 B shows that start signal STV, output enable signal OE, polarity inversion signal POL are near the expansion sequential chart time t1 (Fig. 6 A).
Fig. 6 C shows that start signal STV, output enable signal OE, polarity inversion signal POL are near the expansion sequential chart time t2 (Fig. 6 A).
The reference numeral explanation
30 time schedule controllers
32 scanner drivers
34 liquid crystal panels
36 data drivers
The system that 4 gated sweeps suspend and reply
41 detecting units
43 record cells
45 control signal generators
47 positions/polarity determining means
The method that 5 gated sweeps suspend and reply
The 51-57 step
LV LVDS video signal
LVCLK video signal frequency
The OE output enable signal
The POL polarity inversion signal
The STV start signal
Embodiment
Fig. 3 shows the functional block diagram of liquid crystal display.Time schedule controller (Tcon) 30 receiving video sources, for example Low Voltage Differential Signal form (low-voltage differential signaling, LVDS) video signal LV and corresponding video signal frequency LVCLK.Time schedule controller 30 produces output enable signal OE to scanner driver (or gate drivers) 32.When output enable signal OE was active (for example " 0 "), scanner driver 32 namely sequentially scanned each pixel column of liquid crystal panel 34; When output enable signal OE was non-active (for example " 1 "), scanner driver 32 was the scanning of stop solution crystal panel 34.Time schedule controller 30 is gone back polarization reverse signal POL to data driver (or source electrode driver) 36, and the video signal data that makes data driver 36 export has the suitable potential corresponding to pixel polarity.
The functional block diagram of Fig. 4 shows that the scanning of controlling liquid crystal display suspends and the system 4 of reply, and liquid crystal display wherein can be liquid crystal display shown in Figure 3.The process flow diagram of Fig. 5 shows that the scanning of controlling liquid crystal display suspends and the method 5 of reply.
In the present embodiment, system 4 can be implemented on time schedule controller 30 inside of Fig. 3.Detecting unit 41 monitors that the video signal source is to detect abnormal (step 51) in video signal source.In the present embodiment, detecting unit 41 monitors video signal frequency LVCLK, whether is positioned at the confining spectrum of normal video signal frequency LVCLK with the frequency that determines video signal frequency LVCLK.Abnormal video signal frequency LVCLK represents that video signal LV may just be subject to the impact of noise or interference.
When monitoring, record cell 43 records current scanline line position and corresponding polarity (step 52) constantly or off and on.For example, for the row inversion mechanism, be to record current scanline line position (or number) and corresponding polarity.
When detecting unit 41 when video signal frequency LVCLK to be detected be abnormal (step 53), control signal generator 45 namely produces time-out/reply control signal, in order to output enable signal OE being become non-active (or its current potential is drawn high), thereby the scanning (step 54) of stop solution crystal panel 34.By this, the scanning demonstration namely is suspended.In this simultaneously, this time-out sweep trace also is recorded unit 43 and records.In other words, liquid crystal panel 43 begin the sweep trace that stops showing by special annotation for suspending sweep trace.Moreover this time-out sweep trace suspends accordingly polarity or corresponding the first pixel polarity of pause frame also goes on record.
The sequential chart of Fig. 6 A view similar, it has shown start signal STV and output enable signal OE.Start signal STV normally produces according to vertical synchronizing signal, in order to represent the initial of a frame.In order figure, the n sweep trace of (originating in time t1's) pause frame is subject to noise, thereby the current potential of output enable signal OE is drawn high at this moment.In other words, in this example, the time-out sweep trace is the n sweep trace.Fig. 6 B shows that start signal STV, output enable signal OE, polarity inversion signal POL are near the expansion sequential chart time t1 (Fig. 6 A).Sequential chart illustrated according to Fig. 6 B is negative "-" corresponding to the first pixel polarity of this pause frame.
Next, when detecting unit 41 detects video signal frequency LVCLK and replied (step 55), position/polarity determining means 47 namely determines an appropriate location (or sweep trace) and polarity, in order to the scanning of reply liquid crystal panel 34.In the present embodiment, position/polarity determining means 47 can be kept the state of time-out, until the reply polarity of a frame can be mated (identical) in suspending polarity (step 56).In polarities match the time, output enable signal OE namely becomes initiatively (or current potential drags down), makes when replying scan line position to be same as when suspending scan line position, begins to reply to scan (step 57).At this moment, control signal generator 45 is that the polarization control signal is to time schedule controller 30, in order to export a suitable polarity inversion signal POL to data driver 36.According to another embodiment, it does not wait for the coupling of polarity, but at reply scan line position place, the forcibly changing electric polarity makes it become required reply polarity.
Consult Fig. 6 A, after polarities match, output enable signal OE is dragged down in the n sweep trace place of (originating in time t2's) reply frame.In other words, the reply sweep trace is the n sweep trace, and it is same as the time-out sweep trace.Fig. 6 C shows that start signal STV, output enable signal OE, polarity inversion signal POL are near the expansion sequential chart time t2 (Fig. 6 A).Sequential chart illustrated according to Fig. 6 C is negative "-" corresponding to this reply polarity of replying the first pixel of frame.
According to above-described embodiment, reply by allowing the same position that sweep trace originates in the time-out sweep trace, thereby make liquid crystal panel 34 be replied reposefully scanning.Except same position, the polarity of replying sweep trace also is same as the polarity of suspending sweep trace.By this, can avoid the flicker that causes as traditional Recovery Process or other to disturb, thereby be promoted the quality that video signal shows.
According to another embodiment of the present invention, it uses polarity determination device but not position shown in Figure 4/polarity determining means 47.In the present embodiment, do not need to record the position of suspending sweep trace, need not determine to reply the position of sweep trace yet.In the present embodiment, in case after polarities match (step 56), namely locate to begin to reply scanning in article one sweep trace (but not reply sweep trace of last embodiment) of replying frame.
According to further embodiment of this invention, its use location determination device but not position shown in Figure 4/polarity determining means 47.In the present embodiment, do not need record to suspend polarity, need not determine to reply polarity yet.In the present embodiment, in case detecting unit 41 detects video signal frequency LVCLK and has replied rear (step 55), namely in the reply scan line position of (present frame or next frame) (that is, be same as the position of suspending sweep trace), begin to reply scanning (step 57).
The above is only preferred embodiment of the present invention, is not to limit claim of the present invention; All other do not break away from the equivalence of completing under the spirit that invention discloses and changes or modify, and all should be included in claim of the present invention.
Claims (20)
1. control the scanning time-out of liquid crystal display and the method for replying for one kind, comprise:
Monitor a video signal source, to detect the abnormal of this video signal source;
Record current scanline line position and corresponding polarity;
When detecting this when abnormal, namely stop the scanning of a liquid crystal panel, wherein this liquid crystal panel position of beginning to stop scanning is defined as one and suspends sweep trace, and its corresponding polarity is defined as one and suspends polarity, and corresponding frame definition is a pause frame;
When this video signal source to be detected be normal, namely determine following parameters: one replied sweep trace, and its position is same as this time-out sweep trace; Reach one and reply polarity, it makes a polarity of replying frame be same as the polarity of this pause frame; And
According to following condition to reply the scanning of this liquid crystal panel: the place is replied in this reply sweep trace; And work as this polarities match of replying frame in the polarity chron of this pause frame, reply.
2. control as claimed in claim 1 the method that the scanning of liquid crystal display suspends and replys, wherein above-mentioned video signal source comprises a video signal frequency.
3. control as claimed in claim 2 the scanning time-out of liquid crystal display and the method for replying, wherein the frequency of above-mentioned video signal frequency is monitored, whether is positioned at the confining spectrum of normal video signal frequency to determine it.
4. control as claimed in claim 1 the scanning time-out of liquid crystal display and the method for replying, in stopping in scanning step of above-mentioned liquid crystal panel, become an output enable signal that is fed to the scanner driver of this liquid crystal display non-active.
5. control as claimed in claim 4 the scanning time-out of liquid crystal display and the method for replying, in the reply scanning step of above-mentioned liquid crystal panel, this output enable signal is become initiatively.
6. control as claimed in claim 1 the scanning time-out of liquid crystal display and the method for replying, wherein the polarity of above-mentioned reply frame is the electric polarity by this liquid crystal panel of forcibly changing, makes it be matched with the polarity of this pause frame.
7. control as claimed in claim 1 the method that the scanning of liquid crystal display suspends and replys, wherein the polarity of above-mentioned sweep trace is a polarity inversion signal that is decided by to be fed to the data driver of this liquid crystal display.
8. control as claimed in claim 1 the scanning time-out of liquid crystal display and the method for replying, when this reply scanning did not originate in this reply sweep trace, this reply frame was namely replied since the first sweep trace.
9. control as claimed in claim 1 the scanning time-out of liquid crystal display and the method for replying, wherein the time-out polarity of above-mentioned pause frame is the polarity that is defined as the first pixel of this time-out sweep trace or this pause frame.
10. control as claimed in claim 1 the method that the scanning of liquid crystal display suspends and replys, wherein the first pixel of above-mentioned frame is defined by an initial signal, and this start signal is that the vertical synchronizing signal according to this video signal source produces.
11. control the scanning time-out of liquid crystal display and the system of replying, comprise for one kind:
One detecting unit in order to monitoring a video signal source, to detect the abnormal of this video signal source, by this, when detecting this when abnormal, namely stops the scanning of a liquid crystal panel;
One record cell, in order to record current scanline line position and corresponding polarity, wherein this liquid crystal panel position of beginning to stop scanning is defined as one and suspends sweep trace, and its corresponding polarity is defined as one and suspends polarity, and corresponding frame definition is a pause frame;
One position/polarity determining means, when this video signal source to be detected be normal, namely determine following parameters: one replied sweep trace, and its position is same as this time-out sweep trace; Reach one and reply polarity, it makes a polarity of replying frame be same as the polarity of this pause frame; And
One control signal generator, its according to the result of this detecting unit and this position/polarity determining means producing control signal, and according to following condition to reply the scanning of this liquid crystal panel: the place is replied in this reply sweep trace; And work as this polarities match of replying frame in the polarity chron of this pause frame, reply.
12. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein above-mentioned video signal source comprises a video signal frequency.
13. control as claimed in claim 12 the system that the scanning of liquid crystal display suspends and replys, wherein the frequency of above-mentioned video signal frequency is monitored, whether is positioned at the confining spectrum of normal video signal frequency to determine it.
14. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein above-mentioned liquid crystal panel to stop scanning be according to this control signal, become an output enable signal that is fed to the scanner driver of this liquid crystal display non-active.
15. control as claimed in claim 14 the system that the scanning of liquid crystal display suspends and replys, wherein the reply of above-mentioned liquid crystal panel scanning is according to this control signal, and this output enable signal is become initiatively.
16. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein the polarity of above-mentioned reply frame is the electric polarity by this liquid crystal panel of forcibly changing, makes it be matched with the polarity of this pause frame.
17. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein the polarity of above-mentioned sweep trace is a polarity inversion signal that is decided by to be fed to the data driver of this liquid crystal display.
18. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, when this reply scanning did not originate in this reply sweep trace, this reply frame was namely replied since the first sweep trace.
19. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein the time-out polarity of above-mentioned pause frame is the polarity that is defined as the first pixel of this time-out sweep trace or this pause frame.
20. control as claimed in claim 11 the system that the scanning of liquid crystal display suspends and replys, wherein the first pixel of above-mentioned frame is defined by an initial signal, this start signal is that the vertical synchronizing signal according to this video signal source produces.
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| CN 200910259008 CN102097064B (en) | 2009-12-09 | 2009-12-09 | Method and system for controlling scanning pause and reply of liquid crystal display |
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| CN 200910259008 CN102097064B (en) | 2009-12-09 | 2009-12-09 | Method and system for controlling scanning pause and reply of liquid crystal display |
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| CN109830213B (en) * | 2017-11-23 | 2021-12-21 | 奇景光电股份有限公司 | Display device |
| TWI649744B (en) * | 2018-02-09 | 2019-02-01 | 友達光電股份有限公司 | Image display device, drive control circuit thereof and drive method thereof |
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|---|---|---|---|---|
| US6084562A (en) * | 1997-04-02 | 2000-07-04 | Kabushiki Kaisha Toshiba | Flat-panel display device and display method |
| US6469684B1 (en) * | 1999-09-13 | 2002-10-22 | Hewlett-Packard Company | Cole sequence inversion circuitry for active matrix device |
| CN1746949A (en) * | 2004-09-06 | 2006-03-15 | 索尼株式会社 | Image display unit and method for driving the same |
| CN101000752A (en) * | 2006-01-10 | 2007-07-18 | Nec液晶技术株式会社 | Flashing control system of liquid crystal display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6812911B2 (en) * | 2000-12-04 | 2004-11-02 | Hitachi, Ltd. | Liquid crystal display device |
| TWI242666B (en) * | 2002-06-27 | 2005-11-01 | Hitachi Displays Ltd | Display device and driving method thereof |
| KR20060124485A (en) * | 2005-05-31 | 2006-12-05 | 삼성에스디아이 주식회사 | Electron emission display and driving method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6084562A (en) * | 1997-04-02 | 2000-07-04 | Kabushiki Kaisha Toshiba | Flat-panel display device and display method |
| US6469684B1 (en) * | 1999-09-13 | 2002-10-22 | Hewlett-Packard Company | Cole sequence inversion circuitry for active matrix device |
| CN1746949A (en) * | 2004-09-06 | 2006-03-15 | 索尼株式会社 | Image display unit and method for driving the same |
| CN101000752A (en) * | 2006-01-10 | 2007-07-18 | Nec液晶技术株式会社 | Flashing control system of liquid crystal display device |
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