CN101154356A - Driving method of field-sequence liquid crystal display - Google Patents
Driving method of field-sequence liquid crystal display Download PDFInfo
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- CN101154356A CN101154356A CNA2006101415318A CN200610141531A CN101154356A CN 101154356 A CN101154356 A CN 101154356A CN A2006101415318 A CNA2006101415318 A CN A2006101415318A CN 200610141531 A CN200610141531 A CN 200610141531A CN 101154356 A CN101154356 A CN 101154356A
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Abstract
A field sequence driving method is used to drive an LCD which comprises a plurality of gate lines. The procedures of the field sequence driving method at least include that the gate lines are grouped to a plurality of areas which comprise areas from a first area to an n area; the first area to the n area are addressed in turn, wherein, the addressing procedures of each area at least include that a black signal is written into a pixel of an area and then a white signal is written into the area where the black signal is written into the pixel; color signals are written into the pixels of an area corresponding to the color signals in turn; the light sources from the first area to the n area flicker in turn.
Description
Technical field
The present invention relates to a kind of driving method of LCD, particularly relate to a kind of driving method of field sequence LCD device.
Background technology
Usually the driving method of LCD is divided into two kinds: a colored filter driving method and a preface driving method, its display packing according to color image is distinguished.
The driving method of field sequence LCD device (FS-LCD) is to make tristimulus signal (redness (R) signal, a green (G) signal and a blueness (B) signal) come timesharing ground to show.FS-LCD makes be arranged in the single pixel of three looks backlight of redness (R), green (G) and blue (B), but not be distinguished into R, G and three subpixel of B, so that primaries is by R, G and the B three looks pixel that is provided to backlight, and penetrated liquid crystal (LC), thereby primaries can show under a time separation method in order.
As shown in Figure 1, in traditional F S-LCD, time picture frame of each in the driving method (indicating) has three intervals: first interval is between addressed area 101, in order to write data to this picture frame; Second interval is between the waiting area 102, is the reaction time of liquid crystal; The 3rd interval is to light interval 103, and be backlight in order to open.Please refer to shown in Figure 2, during this picture frame last of short duration in, and between addressed area 101 and the waiting area between after 102, be between some clear zones 103, therefore, if, this light interval 103 too of short duration (be between addressed area 101 and the waiting area between 102 oversize), then be difficult to obtain the high brightness performance.Moreover, because the high impedance of electrode and the low mobility of the TFT on the panel so traditional F S-LCD needs enough sweep speeds, cause a preface (FS) driving method to be difficult to be applied to the display of large tracts of land and high pixel density.Therefore, the conventional ADS driving method has the restriction on the solution, and can't be applicable to the realization of large scale FS-LCD.
In view of this, light the interval so need to prolong this, meaning promptly reduces data write time and LC reaction time, and increases the opening time backlight.Moreover no matter the size of LCD is much all need improve brightness and uniformity coefficient.
Summary of the invention
The present invention is an a kind of preface driving method, in order to drive LCD, to satisfy the longer demand of lighting the interval and increasing the backlight open time that obtains.
The field preface driving method that this kind drives LCD comprises following steps at least: many gate lines are divided into groups, and drive a plurality of pixels in first area and second area; Write first black signal to the first area; After first black signal is written to the first area, write first white signal to the first area; Write colour signal each corresponding pixel to the first area in order, and driven by each gate line in the first area respectively; After colour signal writes, write second black signal to second area; After second black signal writes, write second white signal to second area; Write colour signal each corresponding pixel to the second area in order, and driven by each gate line in the second area respectively; Open a plurality of in order and periodically corresponding to independent first source region in the first area; And open a plurality of in order and periodically corresponding to independent secondary light source zone in the second area.
Wherein, have liquid crystal molecule and switch module in each pixel unit, switch module can make each pixel unit open or close, thereby the reaction time of control liquid crystal molecule, switch module can be thin film transistor (TFT) (Thin-Film Transistor), and liquid crystal molecule can belong to a kind of optical compensation bending mode (Optical Compensated Bend Mode).
Because signal is to be write in order by a zone to another zone, so method of the present invention does not need intactly to scan all gate lines, just can then carry out next procedure: wait the liquid crystal molecule reaction time.In other words, method of the present invention can be after signal writes a zone fully, promptly makes signal write next zone, thereby can reduce the addressing time, with between the waiting area that prolongs time picture frame or light the interval.
Again, in the cycle of inferior picture frame, write first black signal and second black signal in indivedual pixels, in order to as reset signal, with the brightness of compensation LCD.In addition write first black signal and second black signal and can reduce the critical voltage of liquid crystal molecule, thereby reduce operating voltage by deployed condition to a case of bending.
Generally speaking, method of the present invention can obtain the long interval of lighting, thereby obtains higher and brightness uniformly.In addition, owing to have the situation of voltage decline during the case of bending by deployed condition,, thereby improve electrode impedance and the low mobility of the TFT on the display panel so method of the present invention can reduce operating voltage at liquid crystal molecule.
At this, should know that above-mentioned explanation of understanding and following explanation are to illustrate, and explaination further in claims.
Description of drawings
Fig. 1 is the driving synoptic diagram that illustrates according to traditional field sequence LCD device;
Fig. 2 is the driving synoptic diagram that illustrates according to traditional;
Fig. 3 is the driving synoptic diagram that illustrates according to the field preface driving method of one embodiment of the invention;
Fig. 4 is the process flow diagram that illustrates according to the field preface driving method of one embodiment of the invention;
Fig. 5 is the driving synoptic diagram that illustrates according to the field preface driving method of one embodiment of the invention;
Fig. 6 is that the brightness of field preface driving method after writing black signal that illustrates according to one embodiment of the invention changes;
Fig. 7 is that the brightness of field preface driving method after writing white signal that illustrates according to one embodiment of the invention changes.
[primary clustering symbol description]
101: between addressed area 102: between the waiting area
103: light interval 300: inferior picture frame
301: black signal 302: white signal
303: colour signal 304: wait the LC reaction time
305: open light source
401,403,407,409,411,413,415,417: step
511: the first black signals in 510: the first districts
514: 515: the first light sources of inferior picture frame are opened
520: the second 516:LC reaction time the district
522: the second white signals of 521: the second black signals
523: colour signal 524: inferior picture frame
525: secondary light source opens 534,544: inferior picture frame
G1-G240: gate line
Embodiment
Below will application of the present invention be described, please consult corresponding icon simultaneously with a preferred embodiment.Identical object uses same numeral to represent at icon with in describing in detail.
The driving framework of LCD is distinguished into several times picture frame, as shown in Figure 3, inferior picture frame 300 is time sections, and includes five periods: write the black signal period 301, write the white signal period 302, write the colour signal period 303, wait LC reaction period 304 and unlatching light source period 305.Wherein if write about 0.4ms of black signal periods 301; Write about 0.2ms of white signal periods 302; Write about 0.6ms of colour signal periods 303; Wait LC reaction about 3.5ms of periods 304; Open about 1ms of light source periods 305, picture frame T.T. be about 5.7ms then whole time, meaning is that the picture frame frequency is 60Hz.
In Fig. 4, show the process flow diagram of present embodiment.Please refer to Fig. 5, Fig. 5 shows bogie composition according to one preferred embodiment of the present invention, and it is in order to the process flow diagram of key diagram 4.Though following explanation is to come for example with two zones, the present invention is not limited only to be used for two zones, also applicable to multizone more.The step of the driving method of present embodiment is as follows:
In Fig. 5, inferior picture frame 514 is time sections, and it includes five periods: first black signal 511 writes the period, and first white signal 512 writes the period, and colour signal 513 writes the period, waits the LC reaction time 516, and last first light source 515 is opened the period.
In step 409, after colour signal writes, write second black signal to the second district.According to present embodiment, in colour signal 513 is written in first pixel region 510 by gate lines G 1 to G120 defined pixel fully after, second black signal 521 is written in second district 520 by in gate lines G 121 to the G240 defined pixels.
In step 411, after the step that second black signal writes to second district is finished, then write second white signal to the second district.According to present embodiment, second black signal 521 be written to fully second district 520 by gate lines G 121 to G240 defined pixels in after, then write second white signal, 522 to second districts 520 by in gate lines G 121 to the G240 defined pixels.
Then in step 415, open a plurality of independent and in order and periodically corresponding to first light source in first district.It is to carry out between the end region of inferior picture frame 514 that first light source 515 is opened the periods.
Step 417: open a plurality of independent and in order and periodically corresponding to the secondary light source in second district.It is that end at inferior picture frame 524 carries out that secondary light source 525 is opened the periods.
Various the prefaces that driving method of the present invention can be applicable in the LCD drive, for example optical compensation bending mode (Optical Compensated Bend Mode) LCD.According to embodiments of the invention, in first district 510, after the flow for displaying of inferior picture frame 514 finished, the flow for displaying of picture frame 534 was carried out immediately and then next time.Similarly, in second district 520, after the flow for displaying of inferior picture frame 524 finished, the flow for displaying of picture frame 544 was carried out immediately and then next time.In other words, after the flow for displaying of a picture frame finished, the flow for displaying of picture frame can then be carried out immediately next time.Therefore, the primaries that is sent by R, G and B three-color light source can show in the defined pixel of each gate line in corresponding block in order under a time separation method uses, thereby can utilize the instantaneous effect of vision to come the display color image.
According to the above, black signal is written to the beginning of time picture frame, in order to as reset signal, with the brightness of compensation LCD.This evidence is provided among Fig. 6, in black signal inserts the different GTGs of colour signal respectively (as Fig. 6 601 shown in), though the brightness of colour signal still has a little inconsistent when dark attitude, the brightness of colour signal when bright attitude then much at one (as Fig. 6 602 shown in).Therefore, the insertion of black signal can be promoted the luminance uniformity of colour signal.
Yet the replacement time may prolong the cycle of time picture frame.For avoiding this situation to take place, the method needs the shorter reaction time, with the prolongation of compensation cycle.Prove that as Fig. 7 a reaction time includes rise time T
rWith T fall time
f, T wherein
r+ T
f=2.8ms+0.6ms=3.4ms.After inserting white signal, the reaction time is reduced to T
r'+T
f'=2.5ms+0.5ms=3.0ms.Therefore, the method for inserting signal can reduce the reaction time.
Generally speaking, because method separated regions of the present invention scans, so sweep speed can improve, thereby method of the present invention can be applicable in the giant display.In addition, can reduce the reaction time by inserting white signal, thereby long lighting the period can be arranged, and obtain higher and brightness uniformly.In addition, in optical compensation bending mode (Optical CompensatedBend Mode) LCD, owing to have the situation that voltage descends by deployed condition at liquid crystal molecule during case of bending, method of the present invention can reduce operating voltage.
Though the present invention discloses as above with a preferred embodiment, also can realize other embodiment, so the explanation that the present invention preferably implements not is in order to limit the appended spirit and scope that claim defined of the present invention.
Conspicuous, any those skilled in the art can be used for a variety of modifications and variations without departing from the spirit and scope of the present invention, so protection scope of the present invention should be with appended being as the criterion that claim was defined.
Claims (13)
1. field preface driving method, in order to drive a LCD, wherein this LCD includes many gate lines, is used to drive a plurality of pixels, and this method comprises at least:
Write a plurality of black signals to described pixel;
After described black signal is written to described pixel, write a plurality of white signals to described pixel; And
Write a plurality of colour signals in order to described pixel.
2. as claimed in claim 1 preface driving method more comprises:
Described gate line is grouped in a plurality of districts, comprises N district, one first district to, wherein have described pixel in each described district.
3. as claimed in claim 2 preface driving method more comprises:
Light in order light source that should first district to this N district.
4. as claimed in claim 3 preface driving method, wherein this puts the step of bright light source in order, more comprises:
Open a red light source, a green light source and a blue-light source in order.
5. as claimed in claim 1 preface driving method, wherein said colour signal comprises a plurality of danger signals, a plurality of green and a plurality of blue signal.
6. as claimed in claim 1 preface driving method, wherein said black signal belongs to a kind of reset signal, to compensate the brightness of this LCD.
7. as claimed in claim 1 preface driving method, wherein this LCD is an optical compensation bending mode liquid crystal display.
8. preface driving method as claimed in claim 5, wherein said black signal is in order to a plurality of liquid crystal molecules of reducing this optical compensation bending mode liquid crystal display critical voltage by deployed condition to a case of bending.
9. field preface driving method in order to drive a LCD, comprises at least:
Many are assigned in one first district and one second district in order to the gate line that drives a plurality of pixels;
Write the described pixel of a plurality of first black signals to this first district;
Be written to the described pixel in this first district at described first black signal after, write a plurality of first white signals in the described pixel in this first district;
Write a plurality of colour signals each corresponding pixel to this first district in order;
After this colour signal writes, write a plurality of second black signals to the described pixel in this second district;
Write to the described pixel in this second district at described second black signal after, write the described pixel of a plurality of second white signals to this second district;
Write a plurality of colour signals each corresponding pixel in order to this second district;
Open a plurality of in order corresponding to independence first light source in this first district; And
Open a plurality of independent secondary light sources in order corresponding to this second district.
10. as claimed in claim 9 preface driving method, wherein said colour signal comprises a plurality of danger signals, a plurality of green and a plurality of blue signal.
11. as claimed in claim 9 preface driving method, wherein said first black signal and described second black signal belong to a kind of reset signal, to compensate the brightness of this LCD.
12. as claimed in claim 9 preface driving method, wherein this LCD is an optical compensation bending mode liquid crystal display.
13. preface driving method as claimed in claim 12, wherein said black signal is in order to a plurality of liquid crystal molecules of reducing this optical compensation bending mode liquid crystal display critical voltage by deployed condition to a case of bending.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101415318A CN101154356A (en) | 2006-09-29 | 2006-09-29 | Driving method of field-sequence liquid crystal display |
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| CNA2006101415318A CN101154356A (en) | 2006-09-29 | 2006-09-29 | Driving method of field-sequence liquid crystal display |
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| CN101154356A true CN101154356A (en) | 2008-04-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290034A (en) * | 2010-06-21 | 2011-12-21 | 株式会社半导体能源研究所 | Method for driving liquid crystal display device |
| CN102737592A (en) * | 2011-04-15 | 2012-10-17 | 瀚宇彩晶股份有限公司 | Liquid crystal display and method for driving panel by time schedule controller |
| CN104081446A (en) * | 2012-02-10 | 2014-10-01 | 夏普株式会社 | Display device and drive method therefor |
-
2006
- 2006-09-29 CN CNA2006101415318A patent/CN101154356A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290034A (en) * | 2010-06-21 | 2011-12-21 | 株式会社半导体能源研究所 | Method for driving liquid crystal display device |
| CN102290034B (en) * | 2010-06-21 | 2015-07-08 | 株式会社半导体能源研究所 | Method for driving liquid crystal display device |
| CN102737592A (en) * | 2011-04-15 | 2012-10-17 | 瀚宇彩晶股份有限公司 | Liquid crystal display and method for driving panel by time schedule controller |
| CN102737592B (en) * | 2011-04-15 | 2014-12-31 | 瀚宇彩晶股份有限公司 | Liquid crystal display and method for driving panel by time schedule controller |
| CN104081446A (en) * | 2012-02-10 | 2014-10-01 | 夏普株式会社 | Display device and drive method therefor |
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Open date: 20080402 |