CN102270441B - Method and device for reducing ghost images and crosstalk of 3D (Three-dimensional) television - Google Patents
Method and device for reducing ghost images and crosstalk of 3D (Three-dimensional) television Download PDFInfo
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- CN102270441B CN102270441B CN201110228832.5A CN201110228832A CN102270441B CN 102270441 B CN102270441 B CN 102270441B CN 201110228832 A CN201110228832 A CN 201110228832A CN 102270441 B CN102270441 B CN 102270441B
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Abstract
The invention discloses a method for reducing ghost images and crosstalk of a 3D television. The method comprises the steps of: driving a liquid-crystal screen to continuously display a same frame picture for n times; judging whether the proportion ps of a screen area, which meets liquid-crystal display response time 1r, occupying a full screen is larger than or equal to 1 or not when the same frame picture is displayed for n times; and turning on a full-screen backlight to display the same frame picture when ps is larger than or equal to 1, or else, turning on the backlight in a strip-by-strip way by adopting a backlight strip scanning approach so as to display the same frame picture. The invention further provides a corresponding device. According to the method and the device for reducing the ghost images and the crosstalk of the 3D television, provided by the invention, the ghost images and the crosstalk of a shutter glass type 3D television can be reduced.
Description
Technical field
The present invention relates to field of liquid crystal display, specially refer to method and device that a kind of 3D of reduction ghost image of the tv is harassed.
Background technology
The 3D TV of main flow is divided into polarization type and active-shutter at present, and both all need user to wear 3D glasses.
The former polarization type 3D TV, adopt and on liquid crystal display, paste very, the light polarizing film of even line interlacing, its odd-numbered line pad pasting sees through clockwise polarized light, even number line pad pasting sees through anticlockwise polarization light, user wears by clockwise circular polarization left eyeglass lens and anticlockwise circular polarization right eye eyeglass, like this, user's transmitted through glasses, what left eye was seen is the left image content of odd-numbered line on screen, can't see the right image content of even number line, the right image content of even number line on screen and right eye is seen, can't see the left image content of odd-numbered line, thereby see the 3D effect of video.Circular polarization glasses due to what adopt, the picture that user sees is harassed and (is referred to that left eye sees the right picture of video, right eye is seen the left picture of video, also be Cross-talk) less, but because every eyes can only be seen corresponding odd-numbered line or even number line image, so picture vertical definition will reduce half.
The latter's active-shutter 3D TV, shows left picture and right picture at liquid crystal display sequentially, launches the synchronizing signal of display frame by synchronous transmitter simultaneously, shutter glasses receives after synchronizing signal, and the left eyeglass of rotation control is opened, right eyeglass closes and right eyeglass is opened, left eyeglass closes, so, when the left picture of liquid crystal screen display, left eyeglass is opened, and right eyeglass is closed, in like manner, when the right picture of liquid crystal screen display, left eyeglass is closed, and right eyeglass is opened, thereby user sees the 3D effect of video.What show because liquid crystal display is each is the left picture of view picture or right picture, so the sharpness of picture is good, do not suffer a loss, still, due to the intrinsic response time l of liquid crystal in LCDs
r, in left picture, right picture Alternation Display process, if liquid crystal deflection not yet completely, user will see former frame image content, cause ghost image to crosstalk.
Summary of the invention
Method and the device of fundamental purpose of the present invention for providing a kind of 3D of reduction ghost image of the tv to harass, reduces shutter 3D ghost image of the tv and harasses.
The present invention proposes a kind of method that the 3D of reduction ghost image of the tv is harassed, and comprising:
Drive LCDs that same frame picture is shown n time continuously;
When described same frame picture shows for the n time, judgement meets liquid crystal response time l
rscreen area account for full frame ratio p
swhether be more than or equal to 1;
P
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
Preferably, described p
sobtain by following formula:
P
s=(F
r× T
g-1-L
r× F
r) × 100%, F
rfor the refreshing frequency of LCDs, T
gfor the switching time of the corresponding shutter glasses of LCDs.
Preferably, described in, carrying out backlight scanning comprises:
According to described p
scalculating need be lighted the number of backlight;
From top to bottom, one by one, circulate and light backlight of described number.
Preferably, opening full frame backlightly or to adopt backlight scan mode to open one by one backlight when showing described same frame picture, strengthen backlight drive electric current.
Preferably, show continuously during n time at described same frame picture, maintain the deflection polarity of liquid crystal until next frame picture starts demonstration.
The present invention also proposes the device that a kind of 3D of reduction ghost image of the tv is harassed, and comprising:
Driver module, for driving LCDs that same frame picture is shown n time continuously;
Judge module, while demonstration for the n time for described same frame picture, judgement meets liquid crystal response time l
rscreen area account for full frame ratio p
swhether be more than or equal to 1;
Light module, for p
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
Preferably, described judge module is specifically for obtaining p by following formula
s:
P
s=(F
r× T
g-1-L
r× F
r) × 100%, F
rfor the refreshing frequency of LCDs, T
gfor the switching time of the corresponding shutter glasses of LCDs.
Preferably, described in, lighting module comprises:
Computing unit, for according to described p
scalculating need be lighted the number of backlight;
Scanning element, for from top to bottom, one by one, circulation lights backlight of described number.
Preferably, described device also comprises:
Backlight drive module, for opening full frame backlightly or to adopt backlight scan mode to open one by one backlight when showing described same frame picture, strengthens backlight drive electric current.
Preferably, described device also comprises:
Deflection module, for showing continuously during n time at described same frame picture, maintains the deflection polarity of liquid crystal until next frame picture starts demonstration.
Method and device that a kind of 3D of reduction ghost image of the tv that the present invention proposes is harassed, make LCDs open again the user of allowing backlight after obtaining enough response times, deflection and see picture, so, user just can not see the content of a upper picture again, thereby the ghost image that greatly reduces shutter 3D TV is crosstalked.
Brief description of the drawings
Fig. 1 the present invention reduces the schematic flow sheet of method one embodiment that 3D ghost image of the tv harasses;
Fig. 2 the present invention reduces the schematic flow sheet of backlight scanning in method one embodiment that 3D ghost image of the tv harasses;
Fig. 3 the present invention reduces a sequential chart in method one embodiment that 3D ghost image of the tv harasses;
Fig. 4 the present invention reduces the sequential chart of backlight scanning in method one embodiment that 3D ghost image of the tv harasses;
Fig. 5 the present invention reduces the schematic flow sheet of the another embodiment of method that 3D ghost image of the tv harasses;
Fig. 6 the present invention reduces the structural representation of device one embodiment that 3D ghost image of the tv harasses;
Fig. 7 the present invention reduces the structural representation of lighting module in device one embodiment that 3D ghost image of the tv harasses;
Fig. 8 the present invention reduces the structural representation of the another embodiment of device that 3D ghost image of the tv harasses.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, propose the present invention and reduce method one embodiment that 3D ghost image of the tv is harassed, comprising:
Step S10, driving LCDs show same frame picture n time continuously;
When step S11, described same frame picture show for the n time, judgement meets liquid crystal response time l
rscreen area account for full frame ratio p
swhether be more than or equal to 1;
Step S12, p
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
With reference to Fig. 2, step S12 can further comprise:
Step S121, according to described p
scalculate backlight number;
Step S122, from top to bottom, one by one, circulation lights backlight of described backlight number.
In order to reserve enough response times to LCDs, need to improve the refreshing frequency of LCDs, after can not having brushed the left picture signal of a frame, just directly brush the right picture signal of next frame, and the mode that adopts brush multipass is brushed same frame picture continuously, the refresh time of multipass same frame accumulates to reach liquid crystal response time l
rrequirement.Current LCDs, in the time that every frame refreshes, liquid crystal will change deflection polarity to solve ghost problem, and in the present embodiment, in the time that the same frame picture of brush is with accumulative total refresh time continuously, liquid crystal deflection polarity is also needed to do respective handling, after liquid crystal deflection reversing, liquid crystal response time l
rto restart to calculate, therefore, in the process of the continuous picture refreshing of multipass same number of frames, maintain the current deflection polarity of liquid crystal, only, in the time refreshing the picture of different frame, change the deflection polarity of liquid crystal.This is that although deflection polarity does not change, picture is identical due in the time refreshing identical picture, can not produce ghost, and in the time of the Picture switch of different frame, just change the deflection polarity of liquid crystal, avoids ghost.
The switch controlling signal frequency that 3D glasses are set is Gf, and the refreshing frequency of LCDs is F
r, the time of each eyeglass switch of 3D glasses
(formula 1), the refresh time that LCDs is each
(formula 2).In now need be during an eyeglass is opened, complete the picture of n same number of frames of continuous brush, so,
(formula 3).Every n the same frame picture of liquid crystal brushed, and the deflection polarity of liquid crystal changes once.
In the time starting to brush the n time same frame picture, the time that n-1 time accumulated before
(formula 4), can obtain starting to brush the n time thus time, meets liquid crystal response time l
rscreen area account for full frame number percent
(formula 5).
Meet liquid crystal response time l
rscreen area can present to user and watch and avoided harassing of former frame picture.Work as p
s>=1 o'clock, illustrate and starting to brush before the n time, it is that deflection is complete that the liquid crystal that whole frame picture is corresponding has obtained enough response times all, can the disposable full frame user of presenting to watch.Work as p
swhen < 1, only has p
sthe liquid crystal deflection that the screen area of ratio is corresponding is complete, can be presented to user and watch, and then often refreshes the picture of same percentage and again the screen area just having refreshed is presented to user.For p
s>=1 situation, can adopt full frame backlight control switch to realize, in the time will presenting picture and watch to user, open full frame backlight, user's visible picture content.Work as p
swhen < 1, can close full frame backlightly, also can adopt backlight scan mode to present picture, backlight number L
ncan learn by formula calculating below:
(formula 6).Should be noted, if L
nnon-integer, need round and add 1 again.In the time of backlight scanning, the refreshing frequency of image content is P
b=(1/L
n) × 100% (formula 7), in order to reach minimum ghost image crosstalk effect, only light correct position backlight, close and close backlight of opening, so from top to bottom, one by one, circulation lights.
The problem reducing in order to solve brightness that backlight lightening time shorten brings, can open full frame backlightly or to adopt backlight scan mode to open one by one backlight with during showing described same frame picture, and the mode that strengthens backlight drive electric current promotes brightness.
In the present embodiment, make LCDs obtaining enough response times, after liquid crystal deflection, open again the user of allowing backlight and see picture, so, user just can not see the content of a upper picture again, thereby the ghost image that greatly reduces shutter 3D TV is crosstalked.
With reference to Fig. 3, Fig. 4, further illustrate the present embodiment as an example of backlight scan mode and full mode backlight example respectively, Figure 3 shows that LCDs drives the sequential chart of signal (display), 3D glasses switch synchronizing signal and backlight switch control signal, wherein, T
wRfor refreshing right image time, T
wLfor refreshing left image time, T
rfor the frame period, T
dLfor between left picture visibility period, T
dRfor between right picture visibility period, GL is during left eyeglass is opened, and GR is during right eyeglass is opened, BL
oFFfor down periods backlight, BL
oNduring backlight opening.BL
oNduring this time, backlight have full frame backlight and backlight to scan two kinds of modes.
1, backlight scan mode: 3D glasses switch controlling signal frequency is Gf=60 (HZ), and the refreshing frequency of LCDs is F
r=480 (HZ) are l when the liquid crystal response time of LCDs
rwhen=0.006 (second), by (formula 3) can be during an eyeglass be opened domestic demand frequency n=4 of the identical display of the same frame of brush continuously, liquid crystal drive needs to change a deflection polarity every 4 times.Can be in the time starting to brush the 4th by (formula 4), the time of accumulating for 3 times of brush was 0.00625 (second) before.Can be in the time starting to brush the 4th by (formula 5), the picture of Ps=12% has met liquid crystal response time l
rrequirement, due to 12% < 100%, so need to adopt backlight scan mode to process.As shown in Figure 4, PW is LCDs width, and PH is LCDs width, BL
b1～BL
b9for backlight sequence number, B1
on～B9
onfor during backlight of correspondence opens.Can obtain backlight number L by (formula 6)
n=8.33, round after adding 1 again and obtain L
n=8+1=9 (bar).So, be can be calculated by (formula 7), in the time realizing scanning backlight, the every renewal of image content refreshes and reaches P
b=11.1% time, open correct position backlight, close and close backlight of opening, light so from top to bottom, one by one and realize scanning backlight.The present embodiment is not limited in sequential shown in Fig. 2, and any thought of patent thus expands, derivative scanning sequence is all in this scope of patent protection.
2, full frame mode backlight: 3D glasses switch controlling signal frequency is Gf=60 (HZ), and the refreshing frequency of LCDs is F
r=480 (HZ) are l when the liquid crystal response time of LCDs
rwhen=0.006 (second), by (formula 3) can be during an eyeglass be opened domestic demand frequency n=4 of the identical display of the same frame of brush continuously), liquid crystal drive needs to change a deflection polarity every 4 times.Be can be calculated in the time starting to brush the 4th by (formula 4), the time of accumulating for 3 times of brush was 0.00625 (second) before.Be can be calculated in the time starting to brush the 4th by (formula 5), the picture of Ps=108% has met liquid crystal response time l
rrequirement, due to 108% > 100%, so can adopt the mode of full frame backlight control switch to realize.
With reference to Fig. 5, propose the present invention and reduce the another embodiment of method that 3D ghost image of the tv is harassed, in the above-described embodiments, also comprise:
Step S13, in the time that above-mentioned same frame display starts to show for the 1st time, send synchronizing signal to corresponding shutter glasses, control the eyeglass that described display is corresponding and open until above-mentioned same frame picture shows end the n time.
Taking the sequential chart shown in Fig. 3 as example, same frame picture (taking left picture signal as example) connects brush 4 times, in the time starting to brush the 1st time, sends synchronizing signal to 3D glasses, and control 3D glasses are opened left eyeglass and closed right eyeglass until brushed the left picture signal of the 4th.Should be noted that, except above-mentioned better implementation, can also design other implementation, as in the time starting to brush the left picture signal of the 4th, send synchronizing signal to 3D glasses, control 3D glasses are opened left eyeglass and are closed right eyeglass.
With reference to Fig. 6, propose the present invention and reduce device one embodiment that 3D ghost image of the tv is harassed, comprising:
Driver module 10, for driving LCDs that same frame picture is shown n time continuously;
Judge module 20, while demonstration for the n time for described same frame picture, judgement meets liquid crystal response time l
rscreen area account for full frame ratio p
swhether be more than or equal to 1;
Light module 30, for p
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
With reference to Fig. 7, the above-mentioned module 30 of lighting comprises:
Computing unit 31, for according to described p
scalculating need be lighted the number of backlight;
Scanning element 32, for from top to bottom, one by one, circulation lights backlight of described number.
With reference to Fig. 8, in the above-described embodiments, the device that reduction 3D ghost image of the tv is harassed also comprises:
Deflection module 40, for showing continuously during n time at described same frame picture, maintains the deflection polarity of liquid crystal until next frame picture starts demonstration.
Backlight drive module 50, for opening full frame backlightly or to adopt backlight scan mode to open one by one backlight when showing described same frame picture, strengthens backlight drive electric current.
Synchronization module 60, in the time that above-mentioned same frame display starts to show for the 1st time, sends synchronizing signal to corresponding shutter glasses, controls the eyeglass that described display is corresponding and opens until above-mentioned same frame picture shows end the n time.
The device that the reduction 3D ghost image of the tv of the present embodiment is harassed can be LCDs, can be also the device being connected with LCDs.In order to reserve enough response times to LCDs, need to improve the refreshing frequency of LCDs, after can not having brushed the left picture signal of a frame, just directly brush the right picture signal of next frame, and the mode that adopts brush multipass is brushed same frame picture continuously, the refresh time of multipass same frame accumulates to reach liquid crystal response time l
rrequirement.Current LCDs, in the time that every frame refreshes, liquid crystal will change deflection polarity to solve ghost problem, and in the present embodiment, in the time that the same frame picture of brush is with accumulative total refresh time continuously, deflection module 40 need be done respective handling to liquid crystal deflection polarity, after liquid crystal deflection reversing, and liquid crystal response time l
rto restart to calculate, therefore, in the process of the continuous picture refreshing of multipass same number of frames, deflection module 40 maintains the current deflection polarity of liquid crystal, and only, in the time refreshing the picture of different frame, deflection module 40 changes the deflection polarity of liquid crystal.This is that although deflection polarity does not change, picture is identical due in the time refreshing identical picture, can not produce ghost, and in the time of the Picture switch of different frame, just change the deflection polarity of liquid crystal, avoids ghost.
The switch controlling signal frequency that 3D glasses are set is Gf, and the refreshing frequency of LCDs is F
r, the time of each eyeglass switch of 3D glasses
(formula 1), the refresh time that LCDs is each
(formula 2).Driver module 10 completes the picture of n same number of frames of continuous brush in need be during an eyeglass is opened, so,
(formula 3).Every n the same note picture of liquid crystal brushed, and the deflection polarity of liquid crystal changes once.
In the time starting to brush the n time same note picture, the time that n-1 time accumulated before
(formula 4), can obtain starting to brush the n time thus time, meets liquid crystal response time l
rscreen area account for full frame number percent
(formula 5).
Meet liquid crystal response time l
rscreen area can present to user and watch and avoided harassing of former frame picture.Judge module 20 judges p
swhether be more than or equal to 1, work as p
s>=1 o'clock, illustrate and starting to brush before the n time, it is that deflection is complete that the liquid crystal that whole frame picture is corresponding has obtained enough response times all, can the disposable full frame user of presenting to watch.Work as p
swhen < 1, only has p
sthe liquid crystal deflection that the screen area of ratio is corresponding is complete, can be presented to user and watch, and then often refreshes the picture of same percentage and again the screen area just having refreshed is presented to user.For p
s>=1 situation, lights module 30 and can adopt full frame backlight control switch to realize, in the time will presenting picture and watch to user, open full frame backlight, user's visible picture content.Work as p
swhen < 1, light module 30 and can close full frame backlightly, also can adopt backlight scan mode to present picture, backlight number L
ncan be learnt by formula calculating below by computing unit 31:
(formula 6).Should be noted, if L
nnon-integer, computing unit 31 need round and add 1 again.In the time of backlight scanning, the refreshing frequency of image content is P
b=(1/L
n) × 100% (formula 7), in order to reach minimum ghost image crosstalk effect, 32 of scanning elements are lighted backlight of correct position, close and close backlight of opening, so from top to bottom, one by one, circulation lights.
The problem reducing in order to solve brightness that backlight lightening time shorten brings, backlight drive module 50 can opened full frame backlightly or to adopt backlight scan mode to open one by one backlight with during showing described same frame picture, and the mode that strengthens backlight drive electric current promotes brightness.
Because the picture (taking left picture signal as example) of same number of frames connects brush n time, in the time starting to brush the 1st time, synchronization module 60 sends synchronizing signal to 3D glasses, and control 3D glasses are opened left eyeglass and closed right eyeglass until brushed left picture signal the n time.Should be noted that, except above-mentioned better implementation, can also design other implementation, as in the time starting to brush the n time left picture signal, send synchronizing signal to 3D glasses, control 3D glasses are opened left eyeglass and are closed right eyeglass.
In the present embodiment, make LCDs obtaining enough response times, after liquid crystal deflection, open again the user of allowing backlight and see picture, so, user just can not see the content of a upper picture again, thus the ghost image that greatly reduces shutter 3D TV crosstalk, improved image quality.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. reduce the method that 3D ghost image of the tv is harassed, it is characterized in that, comprising:
Drive LCDs that same frame picture is shown n time continuously, and show continuously during n time at described same frame picture, maintain the deflection polarity of liquid crystal until next frame picture starts demonstration; Wherein n=Fr × T
g, F
rfor the refreshing frequency of LCDs, T
gfor the switching time of the corresponding shutter glasses of LCDs;
When described same frame picture shows for the n time, judge time and the liquid crystal response time L that front n-1 the accumulation of this frame picture refreshes
rdifference and the ratio p of the each refresh time of LCDs
swhether be more than or equal to 1; Wherein p
s=(F
r× T
g-1-L
r× F
r) × 100%;
P
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
2. the method for claim 1, is characterized in that, described backlight scanning comprises:
According to described p
scalculating need be lighted the number of backlight;
From top to bottom, one by one, circulate and light backlight of described number.
3. the method for claim 1, is characterized in that, opening full frame backlightly or to adopt backlight scan mode to open one by one backlight when showing described same frame picture, strengthens backlight drive electric current.
4. reduce the device that 3D ghost image of the tv is harassed, it is characterized in that, comprising:
Driver module, for driving LCDs that same frame picture is shown n time continuously;
Deflection module, for showing continuously during n time at described same frame picture, maintains the deflection polarity of liquid crystal until next frame picture starts demonstration; Wherein n=Fr × T
g, F
rfor the refreshing frequency of LCDs, T
gfor the switching time of the corresponding shutter glasses of LCDs;
Judge module, while demonstration for the n time, judges time and the liquid crystal response time L that front n-1 the accumulation of this frame picture refreshes for described same frame picture
rdifference and the ratio p of the each refresh time of LCDs
swhether be more than or equal to 1; Wherein p
s=(F
r× T
g-1-L
r× F
r) × 100%;
Light module, for p
s>=1 o'clock, open full frame backlightly to show described same frame picture, otherwise it is backlight to show described same frame picture to adopt backlight scan mode to open one by one.
5. device as claimed in claim 4, is characterized in that, described in light module and comprise:
Computing unit, for according to described p
scalculating need be lighted the number of backlight;
Scanning element, for from top to bottom, one by one, circulation lights backlight of described number.
6. device as claimed in claim 4, is characterized in that, also comprises:
Backlight drive module, for opening full frame backlightly or to adopt backlight scan mode to open one by one backlight when showing described same frame picture, strengthens backlight drive electric current.
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| CN102685540B (en) * | 2012-04-26 | 2015-03-04 | 青岛海信电器股份有限公司 | Method for optimizing 3D (three-dimensional) display effect and 3D television |
| CN102708808B (en) * | 2012-06-18 | 2016-08-10 | 深圳Tcl新技术有限公司 | The driving method of backlight of television LED, drive circuit and television set |
| CN111968586B (en) * | 2020-09-07 | 2022-02-22 | 京东方科技集团股份有限公司 | Backlight source, driving method thereof, storage medium and display panel |
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| CN101512627A (en) * | 2006-09-06 | 2009-08-19 | 夏普株式会社 | Liuid crystal display device and its driving method |
| CN101604511A (en) * | 2008-06-11 | 2009-12-16 | 胜华科技股份有限公司 | The driving method of three-dimensional display |
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| JP5243439B2 (en) * | 2006-10-06 | 2013-07-24 | スリーエム イノベイティブ プロパティズ カンパニー | Backlight module for autostereoscopic 3D display device and scanning backlight for LCD device |
| KR101637490B1 (en) * | 2009-12-30 | 2016-07-08 | 삼성전자주식회사 | Apparatus and method for displaying 3-dimension image and controlling shutter glasses |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101512627A (en) * | 2006-09-06 | 2009-08-19 | 夏普株式会社 | Liuid crystal display device and its driving method |
| CN101604511A (en) * | 2008-06-11 | 2009-12-16 | 胜华科技股份有限公司 | The driving method of three-dimensional display |
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