CN1247362A - LCD having reduced carton residual image and having background light - Google Patents
LCD having reduced carton residual image and having background light Download PDFInfo
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- CN1247362A CN1247362A CN 99110886 CN99110886A CN1247362A CN 1247362 A CN1247362 A CN 1247362A CN 99110886 CN99110886 CN 99110886 CN 99110886 A CN99110886 A CN 99110886A CN 1247362 A CN1247362 A CN 1247362A
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Abstract
The present invention provides a liquid crystal display device in which the display quality is improved by providing a back light and reducing animation residual image. The solution of the present invention is provided with a frame memory 2, a data serial- parallel converting circuit 3, and a pulse period converting circuit 4. A signal writing device is also provided to write video signals against a display panel 7 with high speed. Furthermore, a back light controlling circuit 8 is provided to control a back light so that, when the video signals equivalent to a next screen is written with the signal writing means, the back light is turned off during the writing time of the video signals and during the liquid crystal response time, and the back light is turned on till the writing operation starts for the video signals equivalent to the next frame.
Description
The present invention relates to liquid crystal indicator, particularly relate to the liquid crystal indicator with bias light improves the liquid crystal indicator of display quality because of minimizing animation afterimage formation.
Usually, the display mode of liquid crystal indicator has, and is known as Semitransmissive, transmission-type with bias light, and the mode that is known as reflection-type.Semitransmissive or transmissive liquid crystal display device with bright display frame, the light source of bias light use for example fluorescent light etc., and bias light is lighted under the liquid crystal indicator user mode usually always.
The display board of liquid crystal indicator is for example showing the animated image occasion, on the time the preceding image not do not disappear and residual unintelligiblely, after passing through certain hour, disappear, produce the phenomenon of so-called animation afterimage.This animation afterimage is if produce, and the fast animation that then moves can become very ugly, thereby produces the problem that display quality reduces.
The objective of the invention is provides a kind of liquid crystal indicator in order to address the above problem, and it can make transmission-type or transflective liquid crystal display device with bias light reduce the animation afterimage and improve display quality.
For achieving the above object, liquid crystal indicator of the present invention is, have in the liquid crystal board of clamping liquid crystal layer between the pair of electrodes substrate to dispose a plurality of pixels, and the signal that writes picture signal on above-mentioned a plurality of pixels repeatedly writes member; Also has the bias light control member, it is when being write member by signal and write the picture signal of a picture, on above-mentioned a plurality of pixels, write in the time of picture signal at least once and the liquid crystal response time that above-mentioned liquid crystal layer reaches the regulation transmissivity, make from the bias light of above-mentioned liquid crystal board backlight and extinguish, after this, in time till when the write activity of the picture signal of next picture begins, make the above-mentioned background luminous point bright.
, consider the various reasons that the animation afterimage produces, the inventor etc. are conceived to following each point, have expected formation of the present invention.
Fig. 6 is the figure of the response characteristics of the general liquid crystal of expression.Transverse axis is time t among the figure, and the longitudinal axis is the transmissivity T of liquid crystal.This family curve is expressed, at t=0, and during T=0, liquid crystal action after applying voltage on the liquid crystal, transmissivity begins to increase, and through t=τ on, after the optical transmission rate was constant, voltage one cut off, transmissivity begins again to lower, and begins the off through t=τ when voltage cuts off, and becomes T=0.I.e. " τ on " till apply voltage at liquid crystal and play light transmission constant is arranged " rise time ", " τ off " cuts off from voltage and begins to recovering " fall time " till the original state.
Like this because corresponding to voltage application, liquid crystal replied hysteresis, for example transmissivity is that 0 o'clock picture shows black, transmissivity one regularly is decided to be white, in the τ on time be from black reply to white transition during, what see after the equalization in people's the eyes is grey.Think when so, showing animated image that this is one of reason of the afterimage of seeing that the image of front is thin out.
Therefore, in the present invention, be used in the time of a picture picture signal write in the write time of liquid crystal board and the liquid crystal response time that liquid crystal layer reaches the regulation transmitance bias light is extinguished, in the remaining time bias light is lighted.Promptly, owing to just light bias light after liquid crystal is replied fully, light in during the transition of liquid crystal is replied does not enter in user's the eye, so the influence that the image of front produces as afterimage has not just had, can access the few qualitative picture of animation afterimage.
In above formation of the present invention, put down in writing " when writing member by signal and write the picture signal of a picture; on above-mentioned a plurality of pixels, write in the time of picture signal at least once and the liquid crystal response time that above-mentioned liquid crystal layer reaches the regulation transmissivity, make from the bias light of above-mentioned liquid crystal board backlight and extinguish ... ".Here the meaning that " writes the time of at least picture signal " is as described below.
Picture scanning has " sequential scanning " that sweep trace one rule is scanned successively, makes sweep trace cross " staggered scanning " of the scanning of regulation bar number, partly scans the modes such as " part scannings " of a picture.These scan modes are used for occasion of the present invention, when writing the picture signal of a picture, use sequential scan mode, write time is once, use interlace mode, a plurality of for the field that constitutes a picture is had, the write time has secondary at least, and the part scan mode write time also is to have secondary at least.Therefore, as above record, represent " time that writes picture signal at least once ".
In addition, the occasion of liquid crystal indicator of the present invention is compared with the liquid crystal indicator of existing bias light Chang Liang, though the time that bias light is lighted is short, if the brightness of this section bias light is improved, the picture deepening can not take place.
For realizing above-mentioned formation of the present invention, picture signal is write the required time (write time) of whole pixels on the liquid crystal board compared with existing, be necessary to shorten.Make the member of write activity high speed or make the member of write activity high speed by gate driver so pointed out particularly respectively in the present invention by data driver.
As this side's of data driver member, having respectively, driving constitutes a plurality of sweep traces of above-mentioned a plurality of pixels and a plurality of gate drivers and the data driver of a plurality of signal wires; Also has direct join rank transformation member, it is that the above-mentioned member that writes will be lined up picture signal in upright arrangement and be divided into the plurality of data driver, and the data that each has been divided are tasked the signal train arranged side by side of these corresponding data drivers together as branch, give corresponding respectively data driver simultaneously these signal trains arranged side by side.
Member as this side of gate driver, the a plurality of sweep traces of the above-mentioned a plurality of pixels of driving formation respectively and a plurality of gate drivers and the data driver of a plurality of signal wires are arranged, also have above-mentioned signal to write member and will give the member that the scanning impulse cycle of the scanning-line signal of above-mentioned gate driver shortens.
These two members only adopt any one all to be fine, and two members have both also passable.In the occasion that has both above-mentioned two members, can obtain the such altogether effect of high speed effect that produces by single member.For example, by the member write time from this side of data driver be existing 1/2, by the member write time from this side of gate driver also is existing 1/2, and the occasion write time of then adopting two members is existing 1/4, can make write activity high speed more.With this formation occasion, the write time can shorten fully, so the bias light fall time short (time of lighting is long) even do not improve the brightness of bias light especially, also can obtain fully bright picture.
Fig. 1 is the block scheme that the summary of the liquid crystal indicator of expression one embodiment of the invention constitutes;
Fig. 2 is in the liquid crystal indicator of the above-mentioned same embodiment of expression, the digital signal of changing processing is side by side supplied with the figure of the state of display board from each data driver;
Fig. 3 is in the liquid crystal indicator of the above-mentioned same embodiment of expression, the form of the data of digital signal before and after arranged side by sideization processing;
Fig. 4 is in the liquid crystal indicator of the above-mentioned same embodiment of expression, the longitudinal diagram of display board part;
Fig. 5 is in the liquid crystal indicator of above-mentioned same embodiment, is the sequential chart of action of explanation liquid crystal indicator;
Fig. 6 is the figure of the response characteristics of the existing general liquid crystal of expression.
Below, describe one embodiment of the present of invention in detail with reference to accompanying drawing.
Fig. 1 is the block scheme that the summary of the liquid crystal indicator of expression present embodiment constitutes.The liquid crystal indicator of present embodiment is the optical transmission type liquid crystal indicator of having powerful connections.
The liquid crystal indicator of present embodiment, as shown in Figure 1, A/D transducer 1, frame memory 2, data direct join rank transformation circuit 3, recurrence interval translation circuit 4 are arranged, synchronizing separator circuit 5, lcd controller 6, gate driver G, 6 data driver D1～D6, display board 7, bias light control circuit 8, bias light 9 etc.The light source of bias light 9 uses xenon lamp etc.In the present embodiment, frame memory 2, data direct join rank transformation circuit 3,4 three inscapes of recurrence interval translation circuit are equivalent to " writing member " (the with dashed lines frame illustrates among Fig. 1) in claims.
Display board, as shown in Figure 4, its formation is to establish transparency electrode 12,13 on the face of respectively facing of a pair of glass substrate 10,11; Also on this each transparency electrode 12,13, establish oriented film 14,15; Set liquid crystal layer 16 14,15 of these oriented films.And, establish first, second Polarizer 17,18 respectively in the outside of glass substrate 10,11, in the outside of second Polarizer 18 bias light 9 is housed.
Along signal flow the formation that device is all is described, at first, vision signal (picture signal) input A/D transducer 1, be transformed to digital signal after, digitized vision signal input frame memory 2.Frame memory 2 is used for a picture unit or field unit or divided frame storage of video signal.
On the other hand, composite synchronizing signal (Csync) input synchronizing separator circuit 5, in synchronizing separator circuit 5, carry out processing that horizontal-drive signal (Hsync) is separated with vertical synchronizing signal (Vsync), and will be used to make the signal of the image synchronization of input to output to lcd controller 6.
In the present embodiment, for the data write activity that makes display board 7 than the existing high speed of wanting, use by this side of data driver and this side of gate driver and make the write activity high speed.As high speed member, be provided with frame memory 2 and data direct join rank transformation circuit 3 by this side of data driver.Therefore, lcd controller 6 will be for will output to data direct join rank transformation circuit 3 from the digital signal of A/D transducer 1 input frame memory 2, then with respect to frame memory 2 output signals.Simultaneously, lcd controller 6 outputs signal to data direct join rank transformation circuit 3, this signal is for control data direct join rank transformation circuit 3, be divided into six parts of 6 data driver D1～D6 so that will output to lining up of data direct join rank transformation circuit 3 digital signal in upright arrangement from frame memory 2, and the data of each division are tasked each data driver D1～D6's and column signal as branch together, output to simultaneously with the corresponding separately data driver D1～D6 of these and column signal in.
Fig. 2 will supply with the figure of the state of display board 7 from each data driver D1～D6 through the digital signal of arranged side by sideization processing, and Fig. 3 is the figure of data form that represents the arranged side by sideization processing front and back of digital signal.As shown in Figure 3, existing hypothesis is S11 as digital signal before the arranged side by sideization processing of a sweep trace, S41, and S12 ..., 18 of S63 etc. line up data in upright arrangement on sequential.So, in data direct join rank transformation circuit 3, according to instruction from lcd controller 6, these 18 data are divided into six parts of 6 data driver D1～D6, the signal that data driver D1 uses is S11, S12, S13, and the signal that data driver D2 uses is S21, S22, S23 ..., respectively assign 3 data corresponding to each data driver D1～D6, form 6 groups of signal trains arranged side by side.
And as shown in Figure 2, these 6 groups and column signal are exported accordingly to data driver D1～D6 simultaneously, and supply with display board 7 through each data driver D1～D6.By carrying out such processing, because time of just exporting 3 data time of 18 data of output, so the data output time is existing 1/6.In addition, be with the explanation of the data instance of a sweep trace herein, but in fact output to display board from data direct join rank transformation circuit 3 through data driver with time of 1/6 corresponding to the signal of whole sweep trace G1～Gn.
High speed member as by this side of gate driver is provided with recurrence interval translation circuit 4.Driving the gateable clock signal that each sweep trace G1～Gn uses exports with respect to gate driver G from lcd controller, and in the present embodiment, the gateable clock signal at first outputs to recurrence interval translation circuit 4, and the mode of recurrence interval of giving the gateable clock signal of gate driver G with shortening in recurrence interval translation circuit 4 is come conversion gateable clock signal.
And, lcd controller 6 control bias lights 9 and output is used for the signal that bias light control circuit 8 makes bias light 9 light or extinguish, in bias light control circuit 8, adopted the driving of sequential scan mode in sweep trace, in the liquid crystal response time of the whole pixels on the display board 7 being carried out the transmissivity (for example can suitably be set at 90%) that write time once in the above-mentioned the sort of write activity and liquid crystal layer 16 reach regulation, the signal that 8 outputs are extinguished bias light 9 to the bias light control circuit, after this write activity finishes, when the signal liquid crystal of corresponding each pixel is replied end, export the signal that bias light 9 is lighted with respect to bias light control circuit 8.
Fig. 5 represents the action timing diagram of the liquid crystal indicator of above-mentioned formation.As shown in Figure 5, in the time t1 (time of a frame) of the pulse of each vertical synchronizing signal Vsync, predetermined data writes frame memory 2 repeatedly, writes data from frame memory 2 to display board 7 in the time t2 in a frame time t1.The write activity of data begins simultaneously, and liquid crystal is replied also and begun, and write activity finishes back t3 time delay, liquid crystal reply end, after this, liquid crystal illustrates the transmissivity (like this, the liquid crystal response time is t2+t3) of regulation.Therefore, among the time t1 of a frame, bias light 9 extinguishes in the time t2+t3 in the early stage, and bias light 9 is lighted in remaining time t4.
At the liquid crystal indicator of present embodiment, write member owing to be provided with by what frame memory 2, data direct join rank transformation device 3, recurrence interval translation circuit 4 were formed, than conventional device, can make the action high speed that writes picture signal to display board 7.Owing to data are sent to 6 data driver D1～D6 side by side and the write time becomes 1/6,, make the write time shorten to common 1/12 so by the effect of two aspects if make the recurrence interval of gateable clock signal shorten to 1/2.In addition, in a frame time, in write time and liquid crystal response time bias light 9 is extinguished, bias light 9 is lighted in excess time.That is, light owing to fully reply rear backdrop light 9 at liquid crystal, the transmitted light during the transition of liquid crystal is replied does not enter in end user's the eye, and previous image can not produce any influence as afterimage, so can obtain the few qualitative picture of animation afterimage.
In addition, technical scope of the present invention is not limited to the foregoing description, and all changes are possible in addition in the scope that does not exceed purport of the present invention.For example, be to use by this side of data driver with by this side of gate driver to be used as constituting of write activity high speed in the above-described embodiments, but also can be only with wherein any.In addition, as scan mode, except that sequential scanning, also applicable staggered scanning, part scanning.
As above-mentioned detailed description, according to liquid crystal indicator of the present invention, be that bias light extinguishes in write time and liquid crystal response time, it is bright that liquid crystal is replied end rear backdrop luminous point, because the light during the transition of liquid crystal is replied does not enter in end user's the eye, so do not exist as the influence of the afterimage of image before, can obtain the image of the few high-quality of animation afterimage.
Claims (3)
1. liquid crystal indicator is characterized in that, have in the liquid crystal board of clamping liquid crystal layer between the pair of electrodes substrate to dispose a plurality of pixels, and the signal that writes picture signal on described a plurality of pixels repeatedly writes member; Also has the bias light control member, this member is when writing member by described signal and write the picture signal of a picture, on described a plurality of pixels, write in the time of picture signal at least once and the liquid crystal response time that above-mentioned liquid crystal layer reaches the regulation transmissivity, make from the bias light of above-mentioned liquid crystal board backlight and extinguish, after this, in time till when the write activity to the picture signal of next picture begins, make the above-mentioned background luminous point bright.
2. liquid crystal indicator according to claim 1 is characterized in that, having respectively, driving constitutes a plurality of sweep traces of above-mentioned a plurality of pixels and a plurality of gate drivers and the data driver of a plurality of signal wires; Also has direct join rank transformation member, this member is that above-mentioned signal writes member and will line up the umber that picture signal in upright arrangement is divided into a plurality of data drivers, and the data that each has been divided are tasked the signal train arranged side by side of these corresponding data drivers together as branch, and give corresponding respectively data driver simultaneously these signal trains arranged side by side.
3. liquid crystal indicator according to claim 1 is characterized in that, having respectively, driving constitutes a plurality of sweep traces of above-mentioned a plurality of pixels and a plurality of gate drivers and the data driver of a plurality of signal wires; Also having above-mentioned signal writes member and will give the member that the scanning impulse cycle of the scanning-line signal of above-mentioned gate driver shortens.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP222079/1998 | 1998-08-05 | ||
| JP10222079A JP2000056738A (en) | 1998-08-05 | 1998-08-05 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1247362A true CN1247362A (en) | 2000-03-15 |
| CN1149526C CN1149526C (en) | 2004-05-12 |
Family
ID=16776804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991108868A Expired - Fee Related CN1149526C (en) | 1998-08-05 | 1999-07-23 | LCD having reduced carton residual image and having background light |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2000056738A (en) |
| CN (1) | CN1149526C (en) |
| TW (1) | TW451180B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437725C (en) * | 2003-12-19 | 2008-11-26 | 三星电子株式会社 | Impulsive driving liquid crystal display and driving method thereof |
| CN101137071B (en) * | 2006-08-31 | 2010-09-29 | 财团法人工业技术研究院 | Stereo picture display apparatus and method to reduce interference of stereo picture |
| CN101388176B (en) * | 2007-09-12 | 2010-10-27 | 立锜科技股份有限公司 | Display system with frame displacement backlight regulation and regulating method thereof |
| CN102194413A (en) * | 2010-03-19 | 2011-09-21 | 友达光电股份有限公司 | Writing-in device for rewritable displaying medium |
| US8072443B2 (en) | 2005-06-29 | 2011-12-06 | Intel Corporation | Techniques to switch between video display modes |
| US8786539B2 (en) | 2006-08-16 | 2014-07-22 | Industrial Technology Research Institute | Stereo-image displaying apparatus and method for reducing stereo-image cross-talk |
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| JP4212791B2 (en) | 2000-08-09 | 2009-01-21 | シャープ株式会社 | Liquid crystal display device and portable electronic device |
| KR100365501B1 (en) * | 2000-12-22 | 2002-12-18 | 엘지.필립스 엘시디 주식회사 | Method Of Driving Liquid Crystal Display |
| JP4210040B2 (en) * | 2001-03-26 | 2009-01-14 | パナソニック株式会社 | Image display apparatus and method |
| KR100818013B1 (en) * | 2004-02-19 | 2008-03-31 | 샤프 가부시키가이샤 | Video display device and video display method |
| JP2006091242A (en) * | 2004-09-22 | 2006-04-06 | Mitsubishi Electric Corp | Translucent type display device |
| US8913089B2 (en) | 2005-06-15 | 2014-12-16 | Sharp Laboratories Of America, Inc. | Methods and systems for enhancing display characteristics with frequency-specific gain |
| US8922594B2 (en) | 2005-06-15 | 2014-12-30 | Sharp Laboratories Of America, Inc. | Methods and systems for enhancing display characteristics with high frequency contrast enhancement |
| US8947465B2 (en) | 2004-12-02 | 2015-02-03 | Sharp Laboratories Of America, Inc. | Methods and systems for display-mode-dependent brightness preservation |
| US9083969B2 (en) | 2005-08-12 | 2015-07-14 | Sharp Laboratories Of America, Inc. | Methods and systems for independent view adjustment in multiple-view displays |
| KR100732845B1 (en) | 2005-11-17 | 2007-06-27 | 이승호 | Flat lamp device for tft-lcd using carbon nano tube |
| KR101320495B1 (en) | 2006-06-30 | 2013-10-22 | 엘지디스플레이 주식회사 | Back light driving method for liquid crystal display |
| JP2008020611A (en) * | 2006-07-12 | 2008-01-31 | M & S Fine Tec Kk | Liquid crystal display device and method for reducing afterimage in same |
| US20080079686A1 (en) * | 2006-09-28 | 2008-04-03 | Honeywell International Inc. | LCD panel with scanning backlight |
| KR20080101680A (en) | 2007-05-18 | 2008-11-21 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | Liquid crystal display device, electronic device, and driving methods thereof |
| WO2009063797A1 (en) | 2007-11-14 | 2009-05-22 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device |
| US9177509B2 (en) | 2007-11-30 | 2015-11-03 | Sharp Laboratories Of America, Inc. | Methods and systems for backlight modulation with scene-cut detection |
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-
1998
- 1998-08-05 JP JP10222079A patent/JP2000056738A/en not_active Withdrawn
-
1999
- 1999-07-15 TW TW88112026A patent/TW451180B/en not_active IP Right Cessation
- 1999-07-23 CN CNB991108868A patent/CN1149526C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437725C (en) * | 2003-12-19 | 2008-11-26 | 三星电子株式会社 | Impulsive driving liquid crystal display and driving method thereof |
| US8072443B2 (en) | 2005-06-29 | 2011-12-06 | Intel Corporation | Techniques to switch between video display modes |
| US8786539B2 (en) | 2006-08-16 | 2014-07-22 | Industrial Technology Research Institute | Stereo-image displaying apparatus and method for reducing stereo-image cross-talk |
| CN101137071B (en) * | 2006-08-31 | 2010-09-29 | 财团法人工业技术研究院 | Stereo picture display apparatus and method to reduce interference of stereo picture |
| CN101388176B (en) * | 2007-09-12 | 2010-10-27 | 立锜科技股份有限公司 | Display system with frame displacement backlight regulation and regulating method thereof |
| CN102194413A (en) * | 2010-03-19 | 2011-09-21 | 友达光电股份有限公司 | Writing-in device for rewritable displaying medium |
| CN102194413B (en) * | 2010-03-19 | 2012-10-03 | 友达光电股份有限公司 | Writing-in device for rewritable displaying medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000056738A (en) | 2000-02-25 |
| TW451180B (en) | 2001-08-21 |
| CN1149526C (en) | 2004-05-12 |
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