CN101226291B - Field sequence LCD and drive method thereof - Google Patents
Field sequence LCD and drive method thereof Download PDFInfo
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- CN101226291B CN101226291B CN200710003878A CN200710003878A CN101226291B CN 101226291 B CN101226291 B CN 101226291B CN 200710003878 A CN200710003878 A CN 200710003878A CN 200710003878 A CN200710003878 A CN 200710003878A CN 101226291 B CN101226291 B CN 101226291B
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Abstract
The invention relates to a field sequential drive method, which comprises providing a liquid crystal display provided with a display unit and a back light unit, while the display unit comprises a plurality of pixel units, actuating a white light source of the back light unit in the first frame period of the frame period of the liquid crystal display, providing red number pixel data in the first frame period to drive the first pixel of the pixel units, providing blue number pixel data in the first frame period to drive the second pixel of the pixel units, actuating the green light source of theback light unit in the second frame period of the frame period, and providing green number pixel data in the second frame period to drive the third pixel in the pixel units.
Description
Technical field
The relevant a kind of LCD (Liquid Crystal Display) of the present invention, and particularly relevant for a kind of preface (Field Sequential) LCD.
Background technology
Conventional liquid crystal is many with white light source, as white light emitting diode (Light EmittingDiode, LED) or cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp CCFL) comes as (Backlight) backlight source.Conventional liquid crystal also with white backlight via the dot structure that comprises redness, green and blue sub-pixels, show by red, green and the blue chromatic image of forming.Yet conventional liquid crystal has some shortcomings.
Please refer to Fig. 1, it is the CIE model chromatic diagram (ChromaticityDiagram) of conventional liquid crystal.C1 and C2 define the American National TV council (National Television SystemCommittee, NTSC) colour gamut of colour gamut of standard television system (Gamut) and conventional liquid crystal respectively.Conventional liquid crystal makes conventional liquid crystal have the shortcoming of displayable green light color saturation degree deficiency because of the saturation degree (Saturation) of the green glow that white light source collocation green tint colo(u)r filter can show is lower.
In addition, because the green light color saturation degree deficiency of conventional liquid crystal, make it can show that colour gamut is in fact less than the colour gamut of ntsc television system standard.So, conventional liquid crystal also has the narrower shortcoming of the colour gamut of demonstration.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of preface (Field Sequential) LCD and a preface driving method.A field sequence LCD device of the present invention and a preface driving method can overcome conventional liquid crystal green light color saturation degree deficiency effectively and can show the shortcoming that colour gamut is narrower.
According to purpose of the present invention, a kind of preface (Field Sequential) LCD is proposed, comprising control module, back light unit and display unit.Control module is in order to receive pixel data, comprising red, green, blueness and black time pixel data.Control module is output red and blue sub-pixels data in the frame period first time in frame period, the green time pixel data of output in its frame period for the second time.Back light unit comprises white light source and green light source, and white light and green glow are sent in its driving that is controlled the unit respectively in first and second time frame period, and white and green light source in second and the frame period for the first time in be disabled.Display unit comprises a plurality of pixel cells, and each pixel cell comprises pixel first, second and third time.Pixel comprises Red lightscreening plate (Color Filter) for the first time, and in the frame period first time, pixel shows the red data picture according to red time pixel data and white light for the first time.Pixel comprises blue color filter for the second time, and in the frame period first time, pixel shows the blue data picture according to blue sub-pixels data and white light for the second time.Pixel comprises green color filter for the third time, and in the frame period second time, pixel shows the green data picture according to green time pixel data and green glow for the third time.Wherein, control module in the frame period second time, provide black time pixel data to the first and this second time pixel, black time pixel data pixel extremely for the third time was provided in the frame period first time.
According to purpose of the present invention, another kind of field sequence LCD device is proposed, comprising control module, back light unit and display unit.Control module is in order to receive pixel data, comprising red, green, blueness and black time pixel data.Control module is output red and blue sub-pixels data in the frame period first time in frame period, the green time pixel data of output in its frame period for the second time.Back light unit comprises white light source and green light source, and white light and green glow are sent in its driving that is controlled the unit respectively in first and second time frame period, and white and green light source in second and the frame period for the first time in be disabled.Display unit comprises a plurality of pixel cells, and each pixel cell comprises pixel first, second and third time.Pixel comprises Red lightscreening plate for the first time, and in the frame period first time, pixel shows the red data picture according to red time pixel data and white light for the first time.Pixel comprises blue color filter for the second time, and in the frame period first time, pixel shows the blue data picture according to blue sub-pixels data and white light for the second time.Pixel is used to show the green data picture according to green time pixel data and green glow in the frame period for the second time for the third time.Wherein, control module in the frame period second time, provide black time pixel data to the first and this second time pixel.
According to another object of the present invention, a kind of preface driving method proposed, it comprises following step.At first, provide LCD,, comprise a plurality of pixel cells in the display unit comprising back light unit and display unit.Then, in the frame period first time in frame period of LCD, the white light source of activation back light unit.Then, in the frame period first time, provide red pixel data to drive the pixel first time in the pixel cell, and it is to show the red data pixel in response to white light and red time pixel data.Then, in the frame period first time, provide the blue sub-pixels data to drive the pixel second time in the pixel cell, and it is in response to white light and blue sub-pixels data presentation blue data pixel.Then, in the frame period second time in frame period, the green light source of activation back light unit.Afterwards, in the frame period second time, provide green pixel data to drive pixel for the third time in the pixel cell, it is to show the green data pixel in response to green glow and green time pixel data.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, now be elaborated as follows especially exemplified by a preferred embodiment and conjunction with figs.:
Description of drawings
Fig. 1 is the CIE model chromatic diagram (Chromaticity Diagram) of conventional liquid crystal.
Fig. 2 is the calcspar according to the field sequence LCD device of first embodiment of the invention.
Fig. 3 is the plan structure figure of display unit 130 among Fig. 2.
Fig. 4 is the detailed plan structure figure of pixel cell 132 among Fig. 3.
Fig. 5 is the sequential chart of field sequence LCD device 200 related signals among Fig. 2.
Fig. 6, it is the CIE model chromatic diagram according to the field sequence LCD device 200 of first embodiment of the invention.
Fig. 7 illustrates the process flow diagram according to the field preface driving method of first embodiment of the invention.
Fig. 8 is another the detailed plan structure figure according to the pixel cell 132 of Fig. 3 of second embodiment of the invention.
Fig. 9 is the related signal sequential chart according to the field sequence LCD device 200 of Fig. 5 of third embodiment of the invention.
Embodiment
First embodiment
Please refer to the 2nd～5 figure, Fig. 2 illustrates the calcspar according to the field sequence LCD device of first embodiment of the invention, Fig. 3 is the plan structure figure of display unit 130 among Fig. 2, Fig. 4 is the detailed plan structure figure of pixel cell 132 among Fig. 3, and Fig. 5 is the sequential chart of field sequence LCD device 200 related signals among Fig. 2.Field sequence LCD device 200 comprises control module 110, back light unit 120 and display unit 130, and back light unit 120 and display unit 130 electrically connect with control module 110.
The control module 110 of present embodiment also in the frame period second time output black time pixel data SDD in inferior pixel 132a and 132b, and in the frame period first time output black time pixel data SDD in inferior pixel 132c, pass through wrong inferior pixel 132a～132c with white light and the green glow of avoiding back light unit 120 to send, and show wrong data display.
Please refer to Fig. 6, it is the CIE model chromatic diagram (Chromaticity Diagram) according to the field sequence LCD device 200 of first embodiment of the invention.Curve C 3 defines the demonstration colour gamut of the field sequence LCD device 200 of present embodiment.The field sequence LCD device 200 of present embodiment shows the green data picture with the green glow collocation green tint colo(u)r filter CG that the green LED array is sent.Compared to conventional liquid crystal, the green glow that the white light collocation green tint colo(u)r filter CG that sends with white light-emitting diode shows has preferable color saturation (Saturation), and its green CIE coordinate for example is (0.17,0.7).
So, the field sequence LCD device 200 displayable green glows of present embodiment and the American National TV council (National Television System Committee, NTSC) green glow of standard has close in fact saturation degree.So, the LCD 200 of present embodiment can overcome the shortcoming of the displayable green light color saturation degree of conventional liquid crystal deficiency effectively, and the color saturation that has displayable green glow in fact is preferable, and can make the comparatively bright-coloured advantage of green composition of the display frame of LCD 200.
In addition, the demonstration colour gamut (Gamut) of the field sequence LCD device 200 of present embodiment also can promote along with the lifting of the color saturation that can show green glow, and the demonstration colour gamut of field sequence LCD device 200 that makes present embodiment is in fact near the colour gamut of NTSC institute standard.So, the field sequence LCD device 200 of present embodiment also has the wider advantage of the colour gamut of demonstration.
Please refer to Fig. 7, it is the process flow diagram according to the field preface driving method of first embodiment of the invention.At first, as step 702, provide field sequence LCD device 200, comprising display unit 130 and back light unit 120, and display unit 130 comprises a plurality of pixel cells 132.Then, as step 704, the white light-emitting diode array in the frame period first time of frame period F (n) F1 (n) in the activation back light unit 120 sends white light.Then, as step 706, provide red pixel data SDR to drive inferior pixel 132a in the pixel cell 132.Inferior pixel 132a shows the red data picture according to red time pixel data SDR and white light.Then, in step 708, also in the frame period first time of frame period F (n) F1 (n), provide blue sub-pixels data SDB to drive inferior pixel 132b in the pixel cell 132.Inferior pixel 132b shows the blue data picture according to blue sub-pixels data SDB and white light.
Then, in step 710, the green LED array of activation back light unit 120 sends green glow in the frame period second time of frame period F (n) F2 (n).Afterwards, as step 712, in frame period second time F2 (n), provide green pixel data SDG to drive inferior pixel 132c in the pixel cell 132.Inferior pixel 132c shows the green data picture according to green time pixel data SDG and green glow.
Wherein, in step 704～708 of the field of present embodiment preface driving method, also being included in provides black time pixel data SDD to drive inferior pixel 132c in the pixel cell 132 among the frame period F1 (n) for the first time, make it show black picture and avoid white light to pass through the display effect that time pixel 132c generation green glow influences blueness and red data picture.Provide black time pixel data SDD to drive inferior pixel 132a and 132b in the pixel cell 132 among the frame period F2 (n) for the second time and in the step 710 and 712 of the field of present embodiment preface driving method, also be included in, influence the display effect of green data picture by inferior pixel 132a and 132b generation ruddiness and blue light and avoid filtering.
Field sequence LCD device of the present invention has the back light unit that comprises white light source and green light source and comprises the dot structure of redness, blueness and green time pixel.White and green light source are respectively at activation in first and second time frame period in the frame period of LCD.Redness and blue sub-pixels receive redness and blue sub-pixels data respectively in the frame period first time, to show redness and blue field preface picture, green time pixel receives green time pixel data to show green field preface picture in the frame period second time.So, the field sequence LCD device of present embodiment can promote the color saturation of green glow via the green time pixel of green glow collocation that green light source sent.So, the field sequence LCD device of present embodiment can overcome the shortcoming of conventional liquid crystal displayable green light color saturation degree deficiency and display frame colour gamut deficiency effectively, and has the wider advantage of displayable green light color saturation degree colour gamut higher and display frame.
Second embodiment
Please refer to Fig. 8, it is another the detailed plan structure figure according to the pixel cell 132 of Fig. 3 of second embodiment of the invention.Field sequence LCD device 200 differences of the field sequence LCD device of present embodiment and first embodiment are that the field sequence LCD device of present embodiment is not use green color filter CG, and replacing green color filter CG in the pixel cell 132 with white optical filter CT, the field sequence LCD device 200 that also is present embodiment is to show green picture via the green glow that white optical filter CT collocation green LED array is sent.
Because the green glow that is sent with white optical filter CT collocation green LED array can show that the displayable optical filtering Se Baodu of field sequence LCD device of the color saturation of green glow and first embodiment is for close in fact.So, the field sequence LCD device of present embodiment also can overcome the shortcoming of conventional liquid crystal displayable green light color saturation degree deficiency and display frame colour gamut deficiency effectively, and has the wider advantage of displayable green light color saturation degree colour gamut higher and display frame.
Though the situation that only replaces green color filter CG with white optical filter CT is that example explains in the present embodiment, and is right, also can not use any optical filter to reach identical effect in white optical filter CT position.
The 3rd embodiment
Please refer to Fig. 9, it is the related signal sequential chart according to the field sequence LCD device 200 of Fig. 5 of third embodiment of the invention.The field sequence LCD device difference of the field sequence LCD device of present embodiment and second embodiment is that control module 110 is via United States Patent (USP) case number the 5929843rd, 6724934 or 6536904 video data processing methods of being mentioned redness, green and blue sub-pixels data SDR, SDG and SDB to be changed into red compensation time pixel data SDR ', green compensation time pixel data SDG ', blue compensation time pixel data SDB ' and white compensation time pixel data SDW '.
And the control module difference of the control module 110 of present embodiment and first embodiment also is among the frame period F1 (n) for the first time to export red, blueness and white compensation time pixel data SDR ', SDB ' and SDW ' in the pixel cell 132 inferior pixel 132a, 132b and 132c respectively, with demonstration redness respectively, blueness and white data picture, but not output red, green and black time pixel data SDR, SDB and SDD drive time pixel 132a, 132b and 132c respectively.
The control module 110 of present embodiment exports green compensation time pixel data SDG ' to inferior pixel 132c in the pixel cell 132 in frame period second time F2 (n), with demonstration green data picture; Its also in frame period second time F2 (n) output black time pixel data SDD ' export inferior pixel 132a and 132b in the pixel cell 132 to so that it shows the black data picture respectively.
And the field preface driving method of present embodiment and first and second embodiment difference are that the field preface driving method of present embodiment is not provide black time pixel data SDD to time pixel 132c in step 704～708, and white compensation time pixel data SDW ' is provided the inferior pixel 132c to pixel cell 132, with the display white data display.
The field sequence LCD device of present embodiment is to comprise that with the back light unit collocation that comprises white and green light source the dot structure of redness, white and blue sub-pixels demonstrates the colour picture that comprises redness, green, blueness and white data picture.And the field sequence LCD device of present embodiment also can promote the color saturation of green glow via the green glow collocation white time pixel that green light source sent.So, the field sequence LCD device of present embodiment also can overcome the shortcoming of conventional liquid crystal displayable green light color saturation degree deficiency and display frame colour gamut deficiency effectively, and has the wider advantage of displayable green light color saturation degree colour gamut higher and display frame.
In sum, though the present invention with preferred embodiment announcement as above, yet it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various changes that are equal to and retouching.Therefore, protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defined.
Claims (12)
1. field sequence LCD device comprises:
One control module, receive a pixel data, this pixel data comprises one red pixel data, one green pixel data, blue sub-pixels data and a black time pixel data, this control module is this redness of output and this blue sub-pixels data in a frame period for the first time in a frame period, this green of output time pixel data in a frame period for the second time in this frame period;
One back light unit, comprise a white light source and a green light source, this white and this green light source are subjected to the driving of this control module respectively, with in this first and this frame period second time in send a white light and a green glow, this white and this green light source respectively at this second and this frame period for the first time in be disabled; And
One display unit comprises a plurality of pixel cells, and each pixel cell comprises:
One pixel for the first time comprises a Red lightscreening plate, and in this frame period for the first time, this first time, pixel showed a red data picture according to the inferior pixel data of this redness and this white light;
One pixel for the second time comprises a blue color filter, and in this frame period for the first time, this, pixel showed a blue data picture according to these blue sub-pixels data and this white light second time; And
One pixel for the third time comprises a green color filter, in this frame period for the second time, this for the third time pixel show a green data picture according to this green time pixel data and this green glow;
Wherein, this control module in the frame period second time, provide this black time pixel data to this first and this second time pixel, in this frame period first time, provide the inferior pixel data of this black to this pixel for the third time.
2. field sequence LCD device as claimed in claim 1 is characterized in that this white light source is a white light emitting diode, and this green light source is a green light LED.
3. field sequence LCD device comprises:
One control module, receive a pixel data, this pixel data comprises one red pixel data, one green pixel data, blue sub-pixels data and a black time pixel data, and in a frame period for the first time in a frame period, export this redness and this blue sub-pixels data, this green of output time pixel data in a frame period for the second time in this frame period;
One back light unit, comprise a white light source and a green light source, this white and this green light source are subjected to the driving of this control module respectively, with in this first and this frame period second time in send a white light and a green glow, this white and this green light source respectively at this second and this frame period for the first time in be disabled; And
One display unit comprises a plurality of pixel cells, and each pixel cell comprises:
One pixel for the first time comprises a Red lightscreening plate, and in this frame period for the first time, this first time, pixel showed a red data picture according to the inferior pixel data of this redness and this white light;
One pixel for the second time comprises a blue color filter, and in this frame period for the first time, this, pixel showed a blue data picture according to these blue sub-pixels data and this white light second time; And
One pixel for the third time shows a green data picture according to this green time pixel data and this green glow in this frame period second time;
Wherein, this control module in the frame period second time, provide this black time pixel data to this first and this second time pixel.
4. field sequence LCD device as claimed in claim 3 is characterized in that this control module provides this black time pixel data to this pixel for the third time in this frame period first time.
5. field sequence LCD device as claimed in claim 3 is characterized in that this pixel data also comprises a white time pixel data, and this control module is this white of output time pixel data in this frame period first time.
6. field sequence LCD device as claimed in claim 5, it is characterized in that this for the third time pixel also receive this white time pixel data in the frame time this first time, and export a white data picture according to this white time pixel data and this white light.
7. field sequence LCD device as claimed in claim 3, it is characterized in that this for the third time pixel comprise a white optical filter.
8. field sequence LCD device as claimed in claim 3 is characterized in that this white light source is a white light emitting diode, and this green light source is a green light LED.
9. field preface driving method comprises:
One LCD is provided, and this LCD comprises a display unit and a back light unit, and this display unit comprises a plurality of pixel cells;
In a frame period for the first time in a frame period, a white light source of this back light unit of activation sends a white light;
In this frame period for the first time, provide one red pixel data to drive the pixel for the first time of one in those pixel cells, this first time, pixel showed a red data picture according to the inferior pixel data of this redness and this white light;
In this frame period for the first time, provide blue sub-pixels data to drive the pixel for the second time of one in these pixel cells, this, pixel showed a blue data picture according to these blue sub-pixels data and this white light second time;
In a frame period for the second time in this frame period, a green light source of this back light unit of activation sends a green glow; And
In this frame period for the second time, provide one green pixel data to drive the pixel for the third time of one in these pixel cells, this for the third time pixel show a green data picture according to this green time pixel data and this green glow.
10. as claimed in claim 9 preface driving method is characterized in that also comprising:
In this frame period for the second time, provide a black time pixel data drive this first and this second time pixel.
11. as claimed in claim 9 preface driving method is characterized in that also comprising:
In this frame period for the first time, provide black time pixel data to drive this pixel for the third time.
12. as claimed in claim 9 preface driving method is characterized in that also comprising:
In this frame period for the first time, provide a white time pixel data to drive this pixel for the third time, this for the third time pixel export a white data picture according to this white time pixel data and this white light.
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| CN200710003878A CN101226291B (en) | 2007-01-15 | 2007-01-15 | Field sequence LCD and drive method thereof |
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| CN200710003878A CN101226291B (en) | 2007-01-15 | 2007-01-15 | Field sequence LCD and drive method thereof |
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| CN101226291B true CN101226291B (en) | 2010-05-19 |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8743035B2 (en) * | 2009-02-27 | 2014-06-03 | GuoPing Chen | Driving method for dynamically driving a field sequential color liquid crystal display |
| EP2557453A4 (en) * | 2010-04-07 | 2013-04-24 | Sharp Kk | Color image display device and control method thereof |
| CN101908328B (en) * | 2010-08-02 | 2012-05-23 | 友达光电股份有限公司 | Field color gamut display and drive method thereof |
| CN102427075B (en) * | 2010-10-12 | 2013-08-21 | 友达光电股份有限公司 | Light emitting diode device and field sequence display |
| CN103135277B (en) * | 2011-11-22 | 2016-06-29 | 上海天马微电子有限公司 | A kind of semitransparent semi-reflective liquid crystal display device and pixel cell thereof |
| JP2013205661A (en) * | 2012-03-29 | 2013-10-07 | Nichia Chem Ind Ltd | Display device and display method using the same |
| TWI457904B (en) | 2012-04-20 | 2014-10-21 | Hung Ta Liu | Display control method for displaying device |
| CN103390390B (en) * | 2012-05-10 | 2016-05-11 | 刘鸿达 | For the display control method of display |
| CN103440826B (en) * | 2013-08-27 | 2016-03-30 | 京东方科技集团股份有限公司 | A kind of display device |
| CN104036739B (en) * | 2014-05-08 | 2016-05-25 | 深圳市华星光电技术有限公司 | A kind of field sequential liquid crystal display drive method and display unit |
| CN104111557B (en) * | 2014-06-25 | 2017-02-15 | 京东方科技集团股份有限公司 | Color membrane substrate, backlight source and display device |
| WO2018062091A1 (en) * | 2016-09-30 | 2018-04-05 | シャープ株式会社 | Field sequential image display device and image display method |
| CN107195279B (en) * | 2017-07-27 | 2019-11-26 | 武汉华星光电技术有限公司 | A kind of drive control method of display panel |
| US10573216B2 (en) | 2017-07-27 | 2020-02-25 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Driving control method by sequentially turning on all of the first, all of the second, all of the third and all of the white color sub-pixels for display panel |
| CN109461421B (en) * | 2018-12-26 | 2021-04-23 | 昆山龙腾光电股份有限公司 | Field sequence display and driving method |
| CN112669780B (en) * | 2020-12-31 | 2022-12-13 | 深圳Tcl数字技术有限公司 | Image display method, liquid crystal display device, apparatus, and storage medium |
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| US6448951B1 (en) * | 1998-05-11 | 2002-09-10 | International Business Machines Corporation | Liquid crystal display device |
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