CN102237057A - Liquid crystal display (LCD) device and driving method - Google Patents
Liquid crystal display (LCD) device and driving method Download PDFInfo
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- CN102237057A CN102237057A CN 201010170236 CN201010170236A CN102237057A CN 102237057 A CN102237057 A CN 102237057A CN 201010170236 CN201010170236 CN 201010170236 CN 201010170236 A CN201010170236 A CN 201010170236A CN 102237057 A CN102237057 A CN 102237057A
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Abstract
The invention provides a driving method of a liquid crystal display (LCD). The LCD is provided with a pixel array. The driving method comprises the following steps of: modulating a first data wire voltage and a first common voltage according to a first frequency in a first period to drive the pixel array; and modulating a second data wire voltage and a second common voltage according to a second frequency in a second period to drive the pixel array. Therefore, the problem of noise generated by frequency resonance of a glass substrate and a driving voltage is improved.
Description
Technical field
The invention relates to the driving method of LCD, and be particularly to be listed as the driving method of counter-rotating.
Background technology
The equivalent electrical circuit of a pixel in traditional LCD comprises sweep trace 101, data line 102, transistor 103, liquid crystal layer equivalent capacity 104, reaches maintenance electric capacity 105 as shown in Figure 1 in the pixel 100.Liquid crystal layer equivalent capacity 104 is connected the shared electrode on the subtend substrate with the other end that keeps electric capacity 105, this shared electrode has common electric voltage Vcom.When sweep trace 101 provides a signal turn-on transistor 103, the conducting that data line 102 is understood because of transistor 103, and data line voltage is applied to liquid crystal equivalent capacity 104 and keeps electric capacity 105.The liquid crystal of liquid crystal layer then can be urged to the state with suitable penetrance according to the cross-pressure of liquid crystal layer equivalent capacity 104.
Generally speaking, before applying a new voltage level, the cross-pressure of liquid crystal layer equivalent capacity 104 is maintained until a few frame (frame) time to I haven't seen you for ages.Yet when applying a direct current voltage for a long time on liquid crystal layer the time, the light-transfer characteristic of liquid crystal may change.This kind change may be permanent, and the quality that causes remedying in the demonstration of liquid crystal panel descends.Therefore, can use the mode of a kind of voltage reversal (inversion) usually, stably change the polarity (polarity) of changing voltage.
Shown in Fig. 2 A, the voltage reversal technology one for when the new pixel column of scanning-line signal driving one, then change the polarity of voltage stride liquid crystal layer equivalent capacity 104, make that polarity is opposite each other between the adjacent pixels row, and the polarity of each pixel column between each frame also can be opposite.This kind method is called row counter-rotating (lineinversion) driving method.
Shown in Fig. 2 B, in frame time common electric voltage Vcom and data line voltage Vdata can be along with the driving of each pixel column alter polarity in regular turn, the driving time that wherein drives each pixel column is T1.
Yet when using the known row inversion driving method of this kind, the glass on the panel can produce resonance because of the reversal of data line voltage and common electric voltage, and then causes noise.In general, the driving time T1 of each pixel column can fix according to frame update rate (frame rate), when in the scope of driving time fixed frequency at 20Hz～20KHz of each pixel column, more can become the noise of being discovered by people's ear easily.
Summary of the invention
The invention provides a kind of driving method of LCD, this LCD has a pel array, and this driving method comprises: modulate one first data line voltage and one first common electric voltage to drive this pel array according to a first frequency between a first phase; And modulate one second data line voltage and one second common electric voltage to drive this pel array according to a second frequency in a second phase.
In the above-mentioned driving method, also comprise periodically according to this first frequency and this second frequency to drive this pel array.
In the above-mentioned driving method, reach this second phase length between this first phase and can be respectively a frame time length, and it is unequal to reach this second phase length between the first phase.
In the above-mentioned driving method, also comprise with the row inversion mode driving this pel array.
Another feature of the present invention provides a kind of liquid crystal indicator, comprising: a display panel has a pel array; And a frequency modulating device, couple this display panel and modulate a data line voltage to drive this pel array according to a first frequency and a second frequency.
According to row inversion driving method of the present invention and liquid crystal indicator, when the present invention can improve tradition and uses row inversion driving liquid crystal indicator, the noise problem that produces because of glass substrate and driving voltage frequency resonance.
Description of drawings
Fig. 1 is the equivalent circuit diagram of a pixel in the conventional liquid crystal.
The polarity synoptic diagram of each pixel in this pel array when Fig. 2 A is the row inversion driving.
When Fig. 2 B is tradition use row inversion driving, the oscillogram of common electric voltage and data line voltage.
When Fig. 3 is the use row inversion driving of one embodiment of the invention, the oscillogram of common electric voltage and data line voltage.
Fig. 4 is the liquid crystal indicator Organization Chart that possesses frequency modulating device of another embodiment of the present invention.
[main element label declaration]
100～pixel; 101～sweep trace;
102～data line; 103～transistor;
104～liquid crystal equivalent capacity; 105～maintenance electric capacity;
400～liquid crystal indicator; 401～source electrode driving device;
402～gate drive apparatus; 403～display panel;
404～frequency modulating device; 405～data line;
406～sweep trace.
Embodiment
Because during traditional row inversion driving, because of the driving frequency of fixing causes the problem of noise, the present invention controls the driving time length of common electric voltage and data line voltage at the driving time control end by frequency modulation (PFM).
When Fig. 3 is the use row inversion driving of one embodiment of the invention, the oscillogram of common electric voltage and data line voltage.The embodiment of the invention changes its output frequency via frequency modulation (PFM) common electric voltage, data line voltage, sweep trace voltage between f1～fn, and according to driving time ta (frequency f a=1/ta; The difference of a=1～n) and can be divided into a plurality of during T1～Tn.During T1, to drive pel array, wherein to drive the time of each row pixel be t1 for data line voltage and common electric voltage according to first frequency f1 modulating data line voltage and common electric voltage.During T2, to drive pel array, wherein to drive the time of each row pixel be t2 for data line voltage and common electric voltage according to second frequency f2 modulating data line voltage and common electric voltage.During Tn, foundation n frequency f n modulating data line voltage and common electric voltage are to drive pel array, wherein to drive the time of each row pixel be tn for data line voltage and common electric voltage, gets back to once more afterwards during the T1, and data line voltage and common electric voltage drive each pixel column with time t1.Further be example explanation present embodiment with n=2, during T1, according to first frequency f1 modulating data line voltage and common electric voltage to drive pel array.During T2, according to second frequency f2 modulating data line voltage and common electric voltage to drive pel array, afterwards periodically according to first frequency f1 and second frequency f2 to drive this pel array.
Wherein (variation of time t1～tn) can be cumulative, decrescence or random number changes to frequency f 1～fn, does not limit.And the time span during each can be the time span that shows a whole frame.
After the circulation through above-mentioned a plurality of stages, noise will not be concentrated in fixing frequency, and can significantly be reduced by different frequency dispersion.
Fig. 4 is the liquid crystal indicator Organization Chart that possesses frequency modulating device of another embodiment of the present invention.Liquid crystal indicator 400 comprises source electrode driving device 401, gate drive apparatus 402, display panel 403, frequency modulating device 404, many data lines 405, multi-strip scanning line 406.Display panel 403 has by many data line 405 and many sweep trace 406 formed pel arrays, wherein the signal Vdata on the data line 405 is provided by source electrode driving device 401, and the signal Vgate on the sweep trace 406 is provided by gate drive apparatus 402.Frequency modulating device 404 couples this display panel, and the signal that will export source electrode driving device 401, gate drive apparatus 402 and common electrode (not shown) to does frequency modulation (PFM), makes panel decline to a great extent because of the noise that driving frequency fixedly causes.
Below only for as embodiment the present invention to be described, the scope of reality of the present invention will be defined by the claim scope.
Claims (6)
1. the driving method of a LCD, this LCD has a pel array, and this driving method comprises:
In between a first phase, modulate one first data line voltage and one first common electric voltage to drive this pel array according to a first frequency; And
Modulate one second data line voltage and one second common electric voltage to drive this pel array in a second phase according to a second frequency.
2. driving method according to claim 1 wherein also comprises:
Periodically according to this first frequency and this second frequency to drive this pel array.
3. driving method according to claim 2 wherein should reach this second phase length and be respectively a frame time length between the first phase.
4. driving method according to claim 3, it is unequal wherein should to reach this second phase length between the first phase.
5. driving method according to claim 1 wherein also comprises:
Drive this pel array with the row inversion mode.
6. liquid crystal indicator comprises:
One display panel has a pel array; And
One frequency modulating device couples this display panel and modulates a data line voltage to drive this pel array according to a first frequency and a second frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010170236 CN102237057A (en) | 2010-04-21 | 2010-04-21 | Liquid crystal display (LCD) device and driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010170236 CN102237057A (en) | 2010-04-21 | 2010-04-21 | Liquid crystal display (LCD) device and driving method |
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| CN 201010170236 Pending CN102237057A (en) | 2010-04-21 | 2010-04-21 | Liquid crystal display (LCD) device and driving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116704970A (en) * | 2023-08-04 | 2023-09-05 | 南京芯视元电子有限公司 | Correction system and method for display signal processing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101527121A (en) * | 2009-04-07 | 2009-09-09 | 华映光电股份有限公司 | Liquid crystal display and method for improving water ripple phenomenon |
| CN100543527C (en) * | 2006-11-10 | 2009-09-23 | 群康科技(深圳)有限公司 | Liquid crystal indicator and driving method thereof |
| US20090303331A1 (en) * | 2008-06-10 | 2009-12-10 | Jeong-Hwan Yoon | Testing apparatus of liquid crystal display module |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100543527C (en) * | 2006-11-10 | 2009-09-23 | 群康科技(深圳)有限公司 | Liquid crystal indicator and driving method thereof |
| US20090303331A1 (en) * | 2008-06-10 | 2009-12-10 | Jeong-Hwan Yoon | Testing apparatus of liquid crystal display module |
| CN101527121A (en) * | 2009-04-07 | 2009-09-09 | 华映光电股份有限公司 | Liquid crystal display and method for improving water ripple phenomenon |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116704970A (en) * | 2023-08-04 | 2023-09-05 | 南京芯视元电子有限公司 | Correction system and method for display signal processing |
| CN116704970B (en) * | 2023-08-04 | 2023-10-24 | 南京芯视元电子有限公司 | Correction system and method for display signal processing |
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Application publication date: 20111109 |