CN100543527C - Liquid crystal indicator and driving method thereof - Google Patents
Liquid crystal indicator and driving method thereof Download PDFInfo
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- CN100543527C CN100543527C CNB2006100635749A CN200610063574A CN100543527C CN 100543527 C CN100543527 C CN 100543527C CN B2006100635749 A CNB2006100635749 A CN B2006100635749A CN 200610063574 A CN200610063574 A CN 200610063574A CN 100543527 C CN100543527 C CN 100543527C
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Abstract
The present invention relates to a kind of liquid crystal indicator.This liquid crystal indicator comprises a liquid crystal panel and a frequency variation signal functional module group, and this frequency variation signal functional module group is connected with this liquid crystal panel, and this frequency variation signal functional module group produces the pixel that a variable-frequency scanning signal drives this liquid crystal panel and carries out the frame counter-rotating.Liquid crystal indicator of the present invention realizes that the variable-frequency scanning mode drives liquid crystal panel and carries out the frame counter-rotating, eliminates the film flicker phenomenon, improves display effect.The present invention provides a kind of driving method of this liquid crystal indicator simultaneously.
Description
Technical field
The invention relates to a kind of liquid crystal indicator and driving method thereof, particularly about a kind of super reverse liquid crystal indicator and driving method thereof.
Background technology
At present, with thin-film transistor LCD device (Thin Film Transistor LiquidCrystal Display, TFT-LCD) compare, super reverse liquid crystal indicator (SuperTwisted Nematic Liquid Crystal Display STN-LCD) has advantages such as cost is low, power consumption is little, the construction cycle is short.Therefore, the super liquid crystal indicator that reverses uses liquid crystal indicator to do on the small size panels such as the instrument of display terminal, instrument at mobile communication equipment, game machine and other still to be widely used.
When the liquid crystal molecule two ends apply unidirectional voltage, if this unidirectional voltage continues one period long period, when promptly the picture of liquid crystal indicator showed same GTG always, liquid crystal molecule caused the nonconformity of electricity easily, be electrochemical reaction, cause the photoelectric characteristic of liquid crystal molecule to be damaged.If this unidirectional voltage continues one period long period, even remove display voltage, liquid crystal molecule can can't be answered the variation of electric field again because characteristic is destroyed and be rotated, to form different GTGs.For avoiding the generation of said circumstances, usually display voltage is divided into both positive and negative polarity, under two kinds of polarity liquid crystal molecule turn to opposite fully.Therefore, by the checker that positive-negative polarity does not stop, just can reach the result that the motionless while liquid crystal characteristic of display frame is not destroyed.
Usually the super scan mode of reversing liquid crystal indicator mainly is frame counter-rotating (FrameInversion).
As shown in Figure 1, be the principle schematic that adopts frame inversion scanning mode in the prior art liquid crystal indicator.The picture that constitutes with 4 * 4 pixels is an example, in the scan mode 100 of this frame counter-rotating, when N frame picture 101, it is identical that the polarity of each pixel institute on-load voltage of picture 101 is adjacent each pixel, when N+1 frame picture 102, the polarity of each pixel institute on-load voltage of picture 102 is opposite with its polarity at this N frame picture 101 time institute on-load voltage.Usually adopt the scan mode of frame counter-rotating, all vertical sweep frequency will be fixed.With 60 hertz sweep frequency, the retention time of each frame is about 1/60=16.67ms, and promptly about every 16ms changes the polarity of each pixel of subframe.Adopt the liquid crystal indicator of frame inversion scanning mode, it is simple in structure, and power consumption is less, and is not easy to produce the cross-talk phenomenon.
But, when adopting the scan mode of frame counter-rotating, when fixing sweep signal and surrounding environment light satisfy interference condition, i.e. two signal frequency unanimities, during constant phase difference, the electromagnetic wave that send in the sweep signal source can interfere phenomenon and produce continuous visible undesired signal with the external environment light wave, this undesired signal shows on the picture of liquid crystal indicator, so produce film flicker (Flicker) phenomenon, allow the human eye perceives picture flash, influence display effect.
Summary of the invention
For solving the problem of liquid crystal indicator film flicker in the prior art, be necessary to provide a kind of liquid crystal indicator of eliminating the film flicker phenomenon.
Be necessary to provide a kind of driving method of eliminating the liquid crystal indicator of film flicker phenomenon simultaneously.
A kind of liquid crystal indicator, it comprises a liquid crystal panel and a frequency variation signal functional module group, this frequency variation signal functional module group is connected with this liquid crystal panel, this frequency variation signal functional module group produces the pixel that a variable-frequency scanning signal drives this liquid crystal panel and carries out the frame counter-rotating, and this frequency variation signal functional module group comprises that one scan frequency storage array, reads register, one scan signal output port and an order register; This frequency variation signal functional module group is controlled this by this order register and is read register and read this sweep frequency storage array, and exports a variable-frequency scanning signal by this sweep signal output port.
A kind of driving method of liquid crystal indicator, it may further comprise the steps: a liquid crystal panel is provided; A plurality of sweep frequency signals are provided; Provide one to read a register and an order register; Write command signal to this order register; This command signal is controlled this and is read register cycle and read this sweep frequency signal; This read that register output read by this sweep frequency signal variable-frequency scanning signal of output alternately; This read that register output read by this sweep frequency signal variable-frequency scanning signal of output alternately; This variable-frequency scanning signal drives this liquid crystal panel and carries out frame counter-rotating, display frame.
Compared to prior art, liquid crystal indicator of the present invention, it carries out the frame counter-rotating by the pixel that a frequency variation signal functional module group produces variable-frequency scanning signal driving liquid crystal panel, electromagnetic wave that sends owing to the sweep signal of frequency change and ambient light phase of wave interfere the undesired signal that produces as seen discontinuous, so naked eyes can not felt the existence of this undesired signal yet.Therefore liquid crystal indicator of the present invention has been eliminated the film flicker phenomenon, improves display effect.
Compared to prior art, the driving method of liquid crystal indicator of the present invention, its by one by a plurality of sweep frequency signals alternately the variable-frequency scanning signal of the output pixel that drives liquid crystal panel carry out the frame counter-rotating, electromagnetic wave that sends owing to the sweep signal of frequency change and ambient light phase of wave interfere the undesired signal that produces as seen discontinuous, so naked eyes can not felt the existence of this undesired signal yet.The driving method of liquid crystal indicator of the present invention has been eliminated the film flicker phenomenon of liquid crystal indicator, improves display effect.
Description of drawings
Fig. 1 is a kind of principle schematic of prior art frame inversion scanning mode.
Fig. 2 is the circuit block diagram of the liquid crystal indicator that disclosed of a kind of better embodiment of the present invention.
Embodiment
Seeing also Fig. 2, is the circuit block diagram of the liquid crystal indicator that disclosed of a kind of better embodiment of the present invention.This liquid crystal indicator 200 comprises a frequency variation signal functional module group 210 and a liquid crystal panel 220 that is connected with this frequency variation signal functional module group 210, wherein this frequency variation signal functional module group 210 comprises that successively the one scan frequency storage array 230, that connects reads register 240 and one scan signal output port 250, also has one to read the order register 260 that register 240 is connected with this.
This sweep frequency storage array 230 comprises one first sweep frequency register 231, one second sweep frequency register 232, one the 3rd sweep frequency register 233, one the 4th sweep frequency register 234 and an output terminal 235.The output terminal of four sweep frequency registers 231,232,233,234 of this sweep frequency storage array 230 all is connected to the output terminal 235 of this sweep frequency storage array 230, and it stores different sweep frequency signals respectively.A kind of preferred scheme is: at the sweep frequency signal of 60 hertz of these first sweep frequency register, 231 storages, sweep frequency signal 70 hertz of these second sweep frequency register, 232 storages, at the sweep frequency signal of 75 hertz of the 3rd sweep frequency register 233 storages, at the sweep frequency signal of 80 hertz of the 4th sweep frequency register 234 storages.This four sweep frequency signal is certain, the laterally zygomorphic ac square wave of frequency.
This reads register 240 and comprises a control end 241, an input end 242 that is connected with the output terminal 235 of this sweep frequency storage array 230 and an output terminal 243; This output terminal 243 is connected to this liquid crystal panel 220 by this sweep signal output port 250; This reads register 240 and can control this by the control signal that this control end 241 obtains and read register 240 and read corresponding sweep frequency signal and output to this output terminal 243 to this sweep frequency storage array 230 from this input end 242.
This order register 260 is a programmable register, it comprises a command signal input end 261 and a control signal output ends 262 that is connected with this control end 241 that reads register 240, can realize by the corresponding control signal of this control signal output ends 262 outputs by write instruction to this command signal input end 261.
The principle of work of this liquid crystal indicator 200 is: when after this command signal input end 261 writes instruction, this control signal output ends 262 reads control end 241 outputs one control signal corresponding of register 240 to this; This control signal is controlled this and is read the scope that register 240 is selected its sweep frequency that reads to this sweep frequency storage array 230, and the time interval of the different scanning frequency signal that is read, and correspondingly read the sweep frequency signal of selected sweep frequency register, so obtain an alternately variable-frequency scanning signal of output of the different sweep frequency signal of several frequencies by these input end 242 circulations of reading register 240; This reads register 240 this variable-frequency scanning signal is outputed to this sweep signal output port 250 by its output terminal 243, finally by this sweep signal output port 250 this variable-frequency scanning signal is outputed to this liquid crystal panel 220, the pixel of controlling this liquid crystal panel 220 carries out the frame counter-rotating.
Difference according to extraneous light frequency, can be by this order register 260 be write different command signals, control this and read the corresponding variable-frequency scanning signal of register 240 outputs, make electromagnetic wave that this variable-frequency scanning signal sends and ambient light phase of wave interfere the discrete undesired signal that is produced drop to the naked eyes fundamental sensation less than, realize the elimination of film flicker phenomenon, improve display effect.
According to the actual needs, can also other sweep frequency signal be set to this each sweep frequency register; The quantity of sweep frequency register can also be a plurality of arbitrarily for other in this sweep frequency storage array 230; This order register 260 can also be integrated in this and read register 240 inside.
Compared to prior art, liquid crystal indicator 200 of the present invention, it carries out the frame counter-rotating by the pixel that this frequency variation signal functional module group 210 generations one variable-frequency scanning signal drives this liquid crystal panel 220, because the frequency of this sweep signal can be selected to adjust according to the frequency of surrounding environment light, as seen make electromagnetic wave that this sweep signal sends itself and ambient light phase of wave interfere the undesired signal that produces is discontinuous, by adjusting the variable-frequency scanning signal of these frequency variation signal functional module group 210 outputs, just can realize interfering the undesired signal that produces be reduced to the naked eyes fundamental sensation less than, the final film flicker phenomenon that realizes eliminating this liquid crystal indicator 200 improves display effect.
The driving method of liquid crystal indicator 200 of the present invention is as described below, and this driving method may further comprise the steps:
Step 2 provides four sweep frequency signals, and this four sweep frequency signal is certain, the laterally zygomorphic ac square wave of frequency.
Wherein, this four sweep frequency signals system is provided by sweep frequency storage array 230, and its frequency can be respectively 60 hertz, 70 hertz, 75 hertz and 80 hertz.
Step 3, this four sweep frequency signal is read in circulation, and exports one by this four sweep frequency signal variable-frequency scanning signal of output alternately.
Wherein, read register 240 circulation and read this four sweep frequency signal by write instruction control to order register 260, and to 250 outputs of sweep signal output port by this four sweep frequency signal variable-frequency scanning signal of output alternately.
Step 4, this variable-frequency scanning signal drive this liquid crystal panel 220 and carry out frame counter-rotating, display frame.
Wherein, this sweep signal output port 250 outputs to this liquid crystal panel 220 with this variable-frequency scanning signal; The pixel of this liquid crystal panel carries out frame counter-rotating, display frame under this variable-frequency scanning signal drives.
Difference according to extraneous light frequency, in the driving method of this liquid crystal indicator 200, can be by writing different command signals to this order register 260, control the read range that this reads the sweep frequency signal of 240 pairs of these sweep frequency storage arrays 230 of register, and the time interval of the different scanning frequency signal that is read, make resulting this variable-frequency scanning signal and extraneous light frequency coherence relate to the discrete undesired signal that is produced drop to the naked eyes fundamental sensation less than, realize the elimination of film flicker phenomenon, improve the display effect of liquid crystal indicator.
According to the actual needs, in the driving method of this liquid crystal indicator 200, the quantity of the sweep frequency signal that this sweep frequency storage array 230 provides can also be a plurality of arbitrarily for other; This order register 260 can also be integrated in this and read register 240 inside.
Compared to prior art, the driving method of liquid crystal indicator 200 of the present invention, it is logical Cross and write command signal to this command register 260 and control this and read register 240 circulation and read A plurality of sweep frequency signals, and produce one by this sweep frequency signal alternately the frequency conversion of output sweep The pixel of retouching this liquid crystal panel 220 of signal driver carries out the frame counter-rotating, because this sweep signal Frequency can be selected to adjust the electricity that this sweep signal is sent according to extraneous light frequency As seen the interfering signal that magnetic wave and extraneous light wave interference produce be discontinuous, transfers by instruction Whole this variable-frequency scanning signal can realize that just the interfering signal that this interference produces is reduced to the naked eyes base This is imperceptible, finally eliminates the film flicker phenomenon of this liquid crystal indicator 200, improves aobvious Show effect. In addition, because the power consumption of liquid crystal indicator is relevant with the size of scan frequency, because of This in the driving method of liquid crystal indicator 200 of the present invention, sweeps by instruction control is low The time of retouching frequency just can be reduced the merit of this liquid crystal indicator 200 when accounting in a big way Consumption.
Claims (7)
1. liquid crystal indicator, it comprises a liquid crystal panel, it is characterized in that: this liquid crystal indicator also comprises a frequency variation signal functional module group, this frequency variation signal functional module group is connected with this liquid crystal panel, this frequency variation signal functional module group produces pixel that a variable-frequency scanning signal drives this liquid crystal panel to carry out the frame counter-rotating, and this frequency variation signal functional module group comprises that one scan frequency storage array, reads register, one scan signal output port and an order register; This frequency variation signal functional module group is controlled this by this order register and is read register and read this sweep frequency storage array, and exports a variable-frequency scanning signal by this sweep signal output port.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: this sweep frequency storage array comprises a plurality of sweep frequency registers, and these a plurality of sweep frequency registers are stored different sweep frequency signals respectively.
3. liquid crystal indicator as claimed in claim 2 is characterized in that: the quantity of sweep frequency register is four in this sweep frequency storage array.
4. liquid crystal indicator as claimed in claim 3 is characterized in that: the sweep frequency signal of storing in this sweep frequency register is certain, the laterally zygomorphic ac square wave of frequency.
5. liquid crystal indicator as claimed in claim 4 is characterized in that: the sweep frequency signal of storing in this four sweep frequencies register is respectively 60 hertz, 70 hertz, 75 hertz and 80 hertz.
6. the driving method of a liquid crystal indicator, it may further comprise the steps: a liquid crystal panel is provided; Provide one scan frequency storage array to export a plurality of sweep frequency signals; Provide one to read a register and an order register; Write command signal to this order register; This command signal is controlled this and is read register cycle and read this sweep frequency signal; This read that register output read by this sweep frequency signal variable-frequency scanning signal of output alternately; This variable-frequency scanning signal drives this liquid crystal panel and carries out frame counter-rotating, display frame.
7. driving method as claimed in claim 6 is characterized in that: this sweep frequency signal is certain, the laterally zygomorphic ac square wave of frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100635749A CN100543527C (en) | 2006-11-10 | 2006-11-10 | Liquid crystal indicator and driving method thereof |
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| CNB2006100635749A CN100543527C (en) | 2006-11-10 | 2006-11-10 | Liquid crystal indicator and driving method thereof |
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| CN101178492A CN101178492A (en) | 2008-05-14 |
| CN100543527C true CN100543527C (en) | 2009-09-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237057A (en) * | 2010-04-21 | 2011-11-09 | 奇景光电股份有限公司 | Liquid crystal display (LCD) device and driving method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102511559B1 (en) * | 2018-01-26 | 2023-03-16 | 엘지디스플레이 주식회사 | Liquid crystal display, contraller and driving method thereof |
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237057A (en) * | 2010-04-21 | 2011-11-09 | 奇景光电股份有限公司 | Liquid crystal display (LCD) device and driving method |
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| CN101178492A (en) | 2008-05-14 |
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Granted publication date: 20090923 Termination date: 20161110 |