CN101650922B - Backlight scanning control method and device of 3D liquid crystal television - Google Patents
Backlight scanning control method and device of 3D liquid crystal television Download PDFInfo
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Abstract
The invention provides a backlight scanning control method and device of a 3D liquid crystal television, and a corresponding 3D liquid crystal television. By the mode of backlight control, the backlight scanning control method and device can realize the purpose of displaying images of the left eye and the right eye at different time and can eliminate the crosstalk of the images of the left eye and the right eye on the basis of no increase of the field frequency, thereby achieving good 3D display effect.
Description
Technical field
The present invention relates to a kind of 3D LCD TV, more specifically, relate to a kind of backlight scanning control method and device of 3D LCD TV.
Background technology
Stereotelevision is that the 3D TV tech mainly is the visual theory according to the mankind, obtain two width of cloth images of same object on different angles, and this two width of cloth image is projected to respectively in people's the left eye and right eye, thereby make the image in people's images of left and right eyes have certain parallax, brain synthesizes the left-and right-eye images with parallax, will produce depth perception, promptly form the display effect of stereo-picture.
The method that has multiple generation and demonstration stereo-picture at present.Aspect demonstration, comprise and use color filter or polarized lenses to separate left-and right-eye images, and utilize the left-and right-eye images that shutter device transmits continuously to timesharing to carry out instantaneous selection.
What adopt in the 3D TV mainly is 3D timesharing display technique, and the left-and right-eye images timesharing on television screen that is about to have certain parallax shows continuously.Spectators wear the glasses with timesharing photoswitch, and the timesharing photoswitch when showing left-eye image before the left eye is opened, the timesharing photoswitch closure before the right eye; Otherwise the timesharing photoswitch when showing eye image before the right eye is opened, the timesharing photoswitch closure before the left eye, thus the images of left and right eyes that guarantees spectators is imported corresponding left and right image respectively, realizes the 3D display effect.
Yet, when the 3D televisor adopts LCD screen, because the intrinsic display characteristic of liquid crystal causes it having some defectives aspect the 3D timesharing demonstration.LCD TV has two key properties: the one, and liquid crystal molecule has certain response time.As shown in Figure 1, the response time be meant liquid crystal material after applying voltage TrR and TrD sum (TrR represents that liquid crystal molecule powers up the back light transmission and changed to for 90% used time by 10%; TrD represents that liquid crystal molecule powers up the back light transmission and became for 10% used time by 90% again), at present about general about 8ms of the response time of the used liquid crystal display of TV.The 2nd, liquid crystal molecule has retention characteristics, and its interelectrode capacity energy storage can not disappear at once behind the loss of voltage that applies of liquid crystal material in other words, and the deflection angle of liquid crystal molecule can't recover original state, keeps up to applying a voltage to liquid crystal once more always.
Because liquid crystal display is to refresh demonstration from top to bottom line by line, as shown in Figure 2, line-scan circuit drives the wherein delegation that opens liquid crystal display, and sample-and-hold circuit drives the column data that writes this row, promptly finishes the demonstration of data line.When refreshing the next line video data, lastrow is because the liquid crystal interelectrode capacity can not be discharged, and video data still can keep, and the video data of this row refreshes it in next.Because the existence of this characteristic, in fact each field picture of liquid crystal display demonstration comprises two parts content as can see from Figure 2, promptly the image more than current refreshed rows is the content when the front court, and the part below current refreshed rows still is left the picture material of previous field.For common 2D signal because the relevant continuity on the image life period between adjacent two, human eye can not feel to have difference, but the timesharing for the 3D signal shows, as described above, because adjacent two field picture is respectively left-and right-eye images, there is bigger difference in two field picture because of having parallax, according to this mode that refreshes, left-and right-eye images mixed in the most of the time, human eye can't be distinguished the picture material of right and left eyes by the glasses of timesharing photoswitch, thereby does not have the effect of watching of 3D.
At above-mentioned display frame cross-interference issue in the 3D LCD TV, Samsung company has proposed a kind of settling mode that inserts black at present, is about to left-and right-eye images and inserts a complete black image after each display frame.As shown in Figure 3, insert a black signal again after showing a width of cloth left-eye image, promptly earlier liquid crystal is closed, like this when showing next width of cloth eye image since on one for black, do not have the residual of left-eye image again, thereby can not cause crosstalking of images of left and right eyes picture, thereby realize effective demonstration of 3D.But, can see also that from Fig. 3 this settling mode must improve field frequency, the field frequency of 120Hz is risen to 240Hz, can insert black.
At present, still do not improve field frequency in the prior art, promptly on the basis that keeps the 120Hz field frequency, realizing the 3D technique for displaying scheme that no left-and right-eye images is crosstalked.
Summary of the invention
The invention provides a kind of backlight scanning control method and device of 3D LCD TV, and corresponding 3D LCD TV.The present invention realizes that by the mode of backlight control the timesharing of left-and right-eye images shows, can eliminate crosstalking of above-mentioned left-and right-eye images on the basis of not improving field frequency, reaches good 3D display effect.
The backlight scanning control method of 3D LCD TV of the present invention comprises: LCDs and back light unit are divided into corresponding N zone with the direction of going; Data interlace refresh LCDs with left-and right-eye images field with certain parallax; After all row in the zone of LCDs were finished refresh response to the data of present image field, the respective regions of back light unit was opened, and other zone of back light unit is closed; Wherein the response time TrR of LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal.
Known in those skilled in the art, the liquid crystal molecule that response time TrR refers to powers up the back light transmission and changed to for 90% used time by 10%.And the value of wherein said N should be more than or equal to 4, otherwise can't reach satisfied time-division display effect.The numerical value of N is selected, and promptly the region quantity of LCDs and back light unit depends primarily on the time of above-mentioned TrR, and the zone of division is many more, and the light efficiency of backlight can be high more, but the corresponding reduction of light output quantity meeting can reduce the display brightness of picture to some extent.Those skilled in the art can be at the TrR time of dissimilar LCDs, and the value of suitable selection N is to take into account backlight efficient and display brightness.
The present invention also provides a kind of scan controller backlight of 3D LCD TV, comprising: LCDs and back light unit, and it is divided into corresponding N zone by the direction with row; Sweep circuit is with the data interlace refresh LCDs of left-and right-eye images field with certain parallax; Backlight control unit, after all row in the zone of LCDs were finished refresh response to the data of present image field, the respective regions of control back light unit was opened, and other zone of control back light unit is closed; The response time TrR of wherein said LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal.
Wherein, described back light unit can adopt led light source, enhancement mode LED (ELED) light source or similar backlight.Described backlight control unit can adopt fpga chip, by each regional led light source or the similar local light source output drive signal of this chip to back light unit.
Described sweep circuit refreshes LCDs in order line by line with the data of present image field.After refresh response to the data of present image field is finished in all provisional capitals in zone of LCDs, think that then this zone finished refresh response.Described sweep circuit comprises: line-scan circuit drives the wherein delegation that opens LCDs; Sample-and-hold circuit drives the view data that writes on this row.
The present invention also provides a kind of 3D LCD TV, and it comprises: LCDs and back light unit, and it is divided into corresponding N zone by the direction with row; Sweep circuit is with the data interlace refresh LCDs of left-and right-eye images field with certain parallax; Backlight control unit, after refresh response to the data of present image field was finished in a zone of LCDs, the respective regions of control back light unit was opened, and other zone of control back light unit is closed; Wherein, the response time TrR of described LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal; And described 3D LCD TV further comprises timesharing photoswitch glasses, and the change-over switch of its images of left and right eyes and described LCDs be actual, and to finish the sequential of response synchronous.
The present invention can be under the constant situation of the field frequency that keeps picture signal, by control mode backlight guarantee to show a left side (right side) eye pattern as the time keep a last width of cloth right side (left side) eye picture to occur LCD screen the backlight of zone close, reach the purpose that the right and left eyes picture separates, efficiently solved left and right sides picture cross-interference issue.The present invention can adopt and the identical driving circuit of common liquid crystals screen, only needs the backlight area that illumination is provided is added Region control, promptly can solve the problem that left and right sides picture is crosstalked, and the existing relatively settling mode of implementation is simple.
In addition, the present invention also has other two big advantages: one, because this scan mode backlight is always just opened backlight after liquid crystal molecule is finished the data response, liquid crystal can not seen by the people at the false picture that the improper biasing attitude of liquid crystal of TrR in during this period of time presented, therefore eliminate the fuzzy of image greatly, can effectively improve the contrast of 3D.Two, scanning backlight is similar has adopted the PWM adjusting to backlight, can effectively improve source efficiency, also meets development trend aspect energy-conservation.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the synoptic diagram of LCDs response time principle of the prior art.
Fig. 2 is the synoptic diagram of LCDs refresh process of the prior art.
Fig. 3 is the synoptic diagram of elimination left-and right-eye images crosstalk method of the prior art.
Fig. 4 A is the sequential schematic diagram of the backlight scanning control method of the embodiment of the invention one.
Fig. 4 B is the synoptic diagram of the back light unit area dividing of the embodiment of the invention one.
Fig. 5 A is the schematic diagram of the scan controller backlight of the embodiment of the invention two
Fig. 5 B is the synoptic diagram of the backlight control chip interface circuit of the embodiment of the invention two.
Embodiment
In order to make those skilled in the art person understand technical scheme of the present invention better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with embodiment and embodiment accompanying drawing.
Embodiment one
Fig. 4 A is the sequential schematic diagram of the backlight scanning control method of the embodiment of the invention one.A is the signal timing diagram that expression images of left and right eyes signal alternates among Fig. 4 A, and in an embodiment of the present invention, the view data of images of left and right eyes shows with the mode interlace refresh of field frequency 120Hz.LCDs and back light unit are divided into A, B, four zones of C, D, and timesharing refreshes and controls, shown in Fig. 4 B.
B is the actual sequential chart of finishing response of LCDs among Fig. 4 A.Because the response time TrR of liquid crystal molecule (for convenience of explanation, the present embodiment hypothesis liquid crystal G-G response time is that 2ms considers), t1 begins the 1st row with the Refresh Data liquid crystal display of present image field constantly, just finishes response (reaching normal deflection state) through TrR to t2 moment back liquid crystal display the 1st row.Shown in c among Fig. 4 A, after finishing the response of present image field data, provisional capitals all in the A district again the backlight of A district opened, and this moment is A district display image only, and other parts are for black; Finish after the response of the data of front court when the liquid crystal of guaranteeing the B district and to open the backlight of B district again, and the like, the demonstration of view picture picture finished.
Because the existence of response time TrR, when LCDs begins with next field picture data (data of the left-eye image field Ln Frame among Fig. 4 A) when refreshing during the A district, control backlight may show the still content of present image field (first eye image field Rn Frame among Fig. 4 A) in C or D district.This moment the A district backlight still closing, finish behind the refreshing and show of present image field data up to the D district, just might open the demonstration of carrying out left-eye image field Ln Frame data backlight in A district once more.As seen, method for controlling backlight thereof of the present invention can be eliminated the problem that left-and right-eye images is crosstalked.But, need to guarantee response time TrR＜3*Ts/4, wherein Ts is the cycle of picture field, the field frequency signal 3*Ts/4=6.25ms for 120Hz promptly requires G-G time T rR＜6.25ms.For the used 120Hz liquid crystal display of LCD TV, the TrR parameter can both meet the demands substantially.So just, can guarantee also not have the phenomenon that left-and right-eye images is crosstalked in each viewing area in each visible demonstration.Because the signal field frequency is 120Hz, the backlight of adjacent area is stepless control successively, therefore also do not have the flickering of image.
Embodiment two
Fig. 5 A is the schematic diagram of scan controller backlight of the present invention.As shown in the figure, LCDs 501 and back light unit 502 are divided into corresponding A, B, four zones of C, D by the direction with row, and area dividing is consistent with the dividing mode among Fig. 4 B.Sweep circuit 503 receives the continuous left-and right-eye images field with certain parallax, the represented left and right picture field aligned phase signal of a among picture field and Fig. 4 A.Sweep circuit 503 is with the data interlace refresh LCDs 501 of received left-and right-eye images field.Generally with the data of present image field, the order by from top to bottom refreshes LCDs 501 to sweep circuit 503 line by line.Sweep circuit 503 comprises: line-scan circuit 503A drives the wherein delegation that opens LCDs 501; Sample-and-hold circuit 503B drives the view data that writes on this row.
Backlight control unit 504 is after refresh response to the data of present image field is finished in A, the B of LCDs 501, C, D one of them zone, zone (for example a-quadrant), to the respective regions of back light unit 502 (promptly, a-quadrant on the back light unit 502) sends signal, open the backlight of this zone, and other zone of control back light unit 502 is closed.And then, finish after the data response of front court when whole pixels in the B district of LCDs 501, open the backlight of B district again, it is backlight to close the A district simultaneously.And the like, up to finishing the demonstration of view picture when the picture of front court.
The back light unit 503 of 3D LCD TV can adopt led light source, the backlight of enhancement mode led light source (ELED) or other similar type.Sequential control backlight can be finished by fpga chip, and the FPGA interface circuit is seen Fig. 5 B, by this chip the led light source of each backlight area or similar light source output LED drive signal is controlled it and lights or close.
The user is watching 3D LCD TV sequential to wear timesharing photoswitch glasses, and the sequential of b among the change-over switch of timesharing photoswitch glasses images of left and right eyes and Fig. 4 A is synchronous, and the 3D of time-sharing format that so just can fine realization 120Hz shows.
The division of backlight area is minimum should to be 4.The quantity in zone depends primarily on the TrR time of LCDs.The zone of dividing is many more, and the light efficiency of backlight can be high more, but the reduction of light output quantity, the brightness meeting reduces to some extent, and those skilled in the art can take in definite according to the different TrR performances of LCDs.
The above only is the embodiment of invention.Protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (8)
1. the backlight scanning control method of a 3D LCD TV is characterized in that: LCDs and back light unit are divided into corresponding N zone with the direction of going; Data interlace refresh LCDs with left-and right-eye images field with certain parallax; After all row in the zone of LCDs were finished refresh response to the data of present image field, the respective regions of back light unit was opened, and other zone of back light unit is closed; The response time TrR of wherein said LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal.
2. the backlight scanning control method of 3D LCD TV according to claim 1 and 2 is characterized in that: the value of described N is more than or equal to 4.
3. the scan controller backlight of a 3D LCD TV is characterized in that, comprising:
LCDs and back light unit, it is divided into corresponding N zone by the direction with row;
Sweep circuit is with the data interlace refresh LCDs of left-and right-eye images field with certain parallax;
Backlight control unit, after all row in the zone of LCDs were finished refresh response to the data of present image field, the respective regions of control back light unit was opened, and other zone of control back light unit is closed; The response time TrR of wherein said LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal.
4. the scan controller backlight of 3D LCD TV according to claim 3 is characterized in that: the value of described N is more than or equal to 4.
5. the scan controller backlight of 3D LCD TV according to claim 3 is characterized in that: described back light unit adopts led light source or enhancement mode led light source.
6. the scan controller backlight of 3D LCD TV according to claim 5 is characterized in that: described backlight control unit can adopt fpga chip, exports the LED drive signal by this chip to each regional led light source of described back light unit.
7. the scan controller backlight of 3D LCD TV according to claim 3 is characterized in that: described sweep circuit comprises: line-scan circuit drives the wherein delegation that opens LCDs; Sample-and-hold circuit drives the view data that writes on this row.
8. a 3D LCD TV is characterized in that, comprising:
LCDs and back light unit, it is divided into corresponding N zone by the direction with row;
Sweep circuit is with the data interlace refresh LCDs of left-and right-eye images field with certain parallax;
Backlight control unit, after refresh response to the data of present image field was finished in a zone of described LCDs, the respective regions of control back light unit was opened, and other zone of control back light unit is closed;
Wherein, the response time TrR of described LCDs is less than (N-1) * Ts/N, and Ts is the field duration of left-and right-eye images signal;
And described 3D LCD TV further comprises timesharing photoswitch glasses, and the change-over switch of its images of left and right eyes and described LCDs be actual, and to finish the sequential of response synchronous.
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Address after: 266004, No. 218, Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee after: Hisense Video Technology Co., Ltd Address before: 266004, No. 218, Bay Road, Qingdao economic and Technological Development Zone, Shandong Patentee before: HISENSE ELECTRIC Co.,Ltd. |