CN102881261A

CN102881261A - Device and method for controlling backlight of 3D (three-dimensional) liquid crystal display screen and liquid crystal display television

Info

Publication number: CN102881261A
Application number: CN2012103701108A
Authority: CN
Inventors: 杨杰; 张士利; 孙明; 郭思敏
Original assignee: Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2012-09-28
Filing date: 2012-09-28
Publication date: 2013-01-16
Anticipated expiration: 2032-09-28
Also published as: CN102881261B

Abstract

The invention discloses a device and a method for controlling a backlight of a 3D (three-dimensional) liquid crystal display screen and a liquid crystal display television, and mainly provides a backlight control method for optimizing display effects of the liquid crystal display screen by adjusting open time periods of the backlight during image scanning. The method for controlling the backlight of the 3D liquid crystal display screen includes: respectively taking continuous N-frame left eye images and continuous N-frame right eye images as an image display group, wherein the image display group at least includes that when scanning of a one-frame image is started, a corresponding backlight is started at the same time, when scanning of the one-frame image is completed, the corresponding backlight is stopped, and starting of the backlight lasts within a time period t. A union set of backlight starting last time periods of the continuous N-frame left eye images is equal to the scanning time, and a union set of backlight starting last time periods of the continuous N-frame right eye images is equal to the scanning time. Using the device and the method for controlling the backlight of the 3D liquid crystal display screen can effectively promote image display effects of the liquid crystal display screen.

Description

The backlight control method of 3D LCDs, device and LCD TV

Technical field

The present invention relates to shutter 3D and show the field, more specifically, particularly relate to a kind of backlight control method, device and LCD TV of 3D LCDs.

Background technology

Show scan-type and the flashing type 3D of shutter 3D LCDs show, wherein said scan-type shows that many groups backlight of referring to LCDs reaches stable opening successively synchronously at the liquid crystal deflecting element of described LCDs and carries out image and show; Described flashing type shows that the many groups backlight that refers to LCDs is opened simultaneously and closed simultaneously to carry out image and shows.

The 3D LCDs is cooperating suitable with it 3D shutter glasses to carry out in the image display process, and for avoiding glasses and backlight when opening simultaneously, glasses have flickering, and backlight is opened after the liquid crystal deflecting element of lens reaches steady state (SS).The LCDs that shows take the 120Hz scan-type is as example, and the liquid crystal deflecting element of lens reached steady state (SS) when backlight was opened, and closed lens when backlight is closed.The LCDs that shows take the 240Hz flashing type is as example, owing to after having shown a frame left-eye image or a frame eye image, all existing a frame to insert image, insert during the image scanning therefore the response time of lens occurs in, the assurance lens deflected into steady state (SS) and closed before next frame left-eye image or eye image arrival and gets final product before backlight is opened.

The LCDs that the 120Hz scan-type shows is cooperating suitable with it 3D shutter glasses to carry out in the image display process, during a frame left-eye image or frame eye image demonstration, be 8.3ms the sweep time of one frame left-eye image or a frame eye image, because the response time of shutter glasses is generally 2ms, therefore the opening time of backlight is generally 6.3ms, less than the sweep time of a two field picture.The LCDs that the 240Hz flashing type shows is cooperating suitable with it 3D shutter glasses to carry out in the image display process, during a frame left-eye image or frame eye image demonstration, be 4.15ms the sweep time of one frame left-eye image or a frame eye image, the opening time of backlight is not subjected to the restriction of shutter glasses, but since the time that the liquid crystal molecule stable state of whole liquid crystal display overlaps be generally 2ms, therefore the opening time of backlight is generally 2ms equally less than sweep time of a two field picture.

So control method of the backlight of existing 3D LCDs, no matter be the LCDs of 120Hz, or the LCDs of 240Hz, based on a frame left-eye image or eye image scan period, all there is the display effect for the image of looking after LCDs middle part scanning area, the opening time of backlight all occurs in the interlude section of image scanning, namely in this image scanning open the opening time t backlight of continuing backlight after the certain hour and before this image scanning finishes, close backlight, with this backlight control mode periodic cycle.Every frame left-eye image that LCDs shows and eye image show that in the middle part scanning area brightness of image is better than the up and down brightness of edge image, also namely the image effect that shows of middle part scanning area will be well and the image display effect in boundary scan zone up and down, cause the brightness irregularities of LCDs whole screen in image display process, and then affect the whole 3D display effect of LCDs.

Summary of the invention

For the problems referred to above, the invention provides a kind of during scan image on the LCDs, the moment of the opening and closing of the backlight by adjusting each two field picture makes the light of backlight cover whole LCDs, and then optimizes control method, device and the LCD TV of backlight of the image display effect of LCDs.

For achieving the above object, the method for controlling backlight thereof of 3D LCDs of the present invention, described 3D LCDs includes backlight control circuit and backlight, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be equal T the sweep time of a described frame left-eye image or eye image, one frame left-eye image or eye image scan period, described backlight reaches at the liquid crystal deflecting element of described glasses to be opened after stable, and lasting opening time is t, and t＜T, described method comprises:

N continuous frame left-eye image is left image demonstration group, and N continuous frame eye image is right image demonstration group, and wherein said N is the integer greater than 1;

In described left image demonstration group, at least include frame left-eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, at least also include a frame left-eye image end of scan, simultaneously, corresponding described backlight is closed in described backlight control circuit control, and the unlatching of described backlight all continues at t in the time period;

In described right image demonstration group, at least include frame eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, at least also include a frame eye image end of scan, simultaneously, corresponding described backlight is closed in described backlight control circuit control, and the unlatching of described backlight all continues at t in the time period;

Wherein, backlight is opened duration section union and is equaled described sweep time of T in the described N continuous frame left-eye image; Backlight is opened duration section union and is equaled described sweep time of T in the described N continuous frame eye image.

Further, in described left image demonstration group, also comprise the moment of the rear pre-timing difference of at least one frame middle left-eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period;

In described right image demonstration group, also comprise the moment that the middle eye image scanning of at least one frame begins rear pre-timing difference, simultaneously, described backlight control circuit is controlled and is opened corresponding described backlight, and the unlatching of described backlight continues at t in the time period.

Especially, adjacent described left-eye image and described eye image be scan period successively, the moment of t1 time after the described left-eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period; In the moment of t2 time after the described eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and described backlight opens and continue at t in the time period, wherein t1=t2.

Particularly, the computing method of described pre-timing difference are: a two field picture sweep time T and image scanning during mistiming of backlight opening time t be (T-t), then the pre-timing difference of the i two field picture in the image demonstration group is (i-1) * (T-t)/N.

In a specific embodiment, described N is specially 3;

The first frame left-eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period;

The first frame eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period;

The second frame left-eye image scans the beginning moment of rear (T-t)/2 time, and simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period;

The second frame eye image scans the beginning moment of rear (T-t)/2 time, and simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period;

The 3rd frame left-eye image end of scan, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the described backlight opening time continues at t in the time period;

The 3rd frame eye image end of scan, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the described backlight opening time continues at t in the time period.

For achieving the above object, the control device of the backlight of 3D LCDs of the present invention, described 3D LCDs includes backlight control circuit and backlight, wherein said backlight control circuit is electrically connected the image controller of described 3D LCDs, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be T the sweep time of a described frame left-eye image or a frame eye image, during one frame left-eye image or eye image show, described backlight is opened after the liquid crystal deflecting element of described glasses is stable, lasting opening time is t, and t＜T, and described device comprises:

It is left image demonstration group that described image controller distributes N continuous frame left-eye image, and N continuous frame eye image is right image demonstration group, and wherein said N is the integer greater than 1;

In described left image demonstration group, when including at least two field picture scanning beginning, simultaneously, described image controller output control signal is controlled described backlight control circuit control and is opened corresponding described backlight, when at least also including a two field picture end of scan, simultaneously, described image controller is controlled the control of described backlight control circuit and is closed corresponding described backlight, and described backlight controller is controlled described backlight and all opened and continue at t in the time period;

In described right image demonstration group, when including at least two field picture scanning beginning, simultaneously, described image controller output control signal is controlled described backlight control circuit control and is opened corresponding described backlight, when at least also including a two field picture end of scan, simultaneously, described image controller is controlled the control of described backlight control circuit and is closed corresponding described backlight, and described backlight controller is controlled described backlight and all opened and continue at t in the time period;

Wherein, described N continuous frame left-eye image backlight module is opened duration section union and is equaled described sweep time of T; Described N continuous frame left-eye image backlight module is opened duration section union and is equaled described sweep time of T.

Further, described backlight control circuit comprises chronotron, exports to described backlight control circuit for the control signal of described image controller output is delayed time;

In described left image demonstration group, left-eye image scanning begins the rear in advance moment of timing difference in the middle of also comprising at least one frame, simultaneously, described chronotron is exported to described backlight control circuit control with the control signal of image controller output and is opened corresponding described backlight, and the unlatching of described backlight continues at t in the time period;

In described right image demonstration group, eye image scanning begins the rear in advance moment of timing difference in the middle of also comprising at least one frame, simultaneously, described chronotron is exported to described backlight control circuit control with the control signal of image controller output and is opened corresponding described backlight, and the unlatching of described backlight continues at t in the time period.

Especially, described backlight control circuit also comprises reproducer, in adjacent described left-eye image and described eye image successively scan period, described backlight control circuit output control signal when the rear t1 of described left-eye image scanning beginning is constantly controlled described backlight and is opened, and described backlight continues at t in the time period; Described reproducer is for the value of storing described t1, and the value of described t1 exported to described backlight control circuit, described backlight control circuit is controlled described backlight according to value output control signal when the rear t2 of described eye image scanning beginning constantly of described t1 and is opened, and described backlight continued at t in the time period, wherein t1=t2.

Particularly, described backlight control circuit also comprises counter, is used for calculating the value of described pre-timing difference and this value being fed back to described delay unit.

For achieving the above object, LCD TV of the present invention comprises the backlight control apparatus of LCDs and LCDs, and described backlight control apparatus is above-mentioned backlight control apparatus.

Compare with the prior art scheme, the technical scheme by among the one or more embodiment in the embodiment of the present application can obtain following technique effect at least:

First, by during continuous N frame left-eye image and continuous N frame eye image show, adjust respectively the opening time of backlight, so that the initial time that the opening time of continuous N frame left-eye image covers two field picture scanning is to whole sweep time of the section of the finish time, the initial time that the opening time of continuous N frame eye image is same to cover two field picture scanning is to whole sweep time of the section of the finish time; Solved in the prior art because the opening time of the backlight of every two field picture all is the interlude sections that occur in image scanning, the brightness in the up and down boundary scan zone of the LCDs that causes is lower than the middle part scanning area, the technical matters of LCDs brightness irregularities has realized it being that the brightness of whole display screen is tending towards uniform technique effect.

Second, owing to having adjusted the opening time of backlight, carrying out left-eye image and eye image when switching for LCDs, produce the picture crosstalk scanning area corresponding variation has also occured, solved that picture crosstalk concentrates on the technical matters that scanning area fixing on the LCDs occurs in the prior art, realized the average technique effect on whole display screen of the generation area of picture crosstalk.

The 3rd, during image scanning, adjust the opening time of backlight, realize brightness and picture crosstalk equalization on whole display screen of liquid crystal display, and then reached the purpose that promotes LCDs 3D display effect.

The backlight control apparatus of 3D liquid crystal display of the present invention, adopt the backlight control signal that changes the output of backlight controller to realize 3D LCD screen backlight control method of the present invention, under the condition that does not increase extra cost, realized the lifting of the 3D rendering display effect of 3D LCDs.

LCD TV of the present invention, adopting the backlight control apparatus of 3D LCDs of the present invention is the backlight control apparatus of LCD TV of the present invention, has promoted the display effect of the 3D rendering of LCD TV.

Description of drawings

Fig. 1 is the sequential chart that existing backlight is opened with scan mode;

Fig. 2 is the embodiment of the invention 1 sequential chart of opening backlight;

Fig. 3 is the sequential chart that existing backlight is opened with scan mode and glasses are opened;

Fig. 4 is the embodiment of the invention 2 sequential charts of opening backlight;

Fig. 5 is existing backlight with the sequential chart that the while unfolding mode is opened and glasses are opened;

Fig. 6 is the embodiment of the invention 3 sequential charts of opening backlight.

Embodiment

The present invention will be further described below in conjunction with Figure of description.

The method for controlling backlight thereof of 3D LCDs of the present invention, described 3D LCDs includes backlight control circuit and backlight, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be equal T the sweep time of a described frame left-eye image or eye image, one frame left-eye image or eye image scan period, described backlight reaches at the liquid crystal deflecting element of described glasses to be opened after stable, lasting opening time is t, and t＜T, and described method comprises:

Wherein, described union refers to, the N situation that equals 2 for example, the T1 time is opened and continue to be opened to the backlight of the first two field picture when this image begins to scan (T1 is the opening time that backlight is reserved in advance, and T1＜T), the backlight of the second two field picture is closed when this image scanning finishes, and continue equally to have opened the T1 time, then the backlight of the second two field picture in this image scanning open in the Tx, as Tx during less than T1, the first two field picture and the second two field picture backlight are opened duration section union and are equaled described sweep time of T, as Tx during greater than T1, it is two periods that the first two field picture and the second two field picture backlight are opened duration section union, the first paragraph time for begin from image scanning the time be carved into a period of time after the T1, the second segment time is a period of time of end from Tx to image scanning.It is as the same when N equals other integers such as 3,4,5.

Accordingly, the control device of the backlight of 3D LCDs of the present invention, described 3D LCDs includes backlight control circuit and backlight, wherein said backlight control circuit is electrically connected the image controller of described 3D LCDs, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be T the sweep time of a described frame left-eye image or a frame eye image, during one frame left-eye image or eye image show, described backlight is opened after the liquid crystal deflecting element of described glasses is stable, lasting opening time is t, and t＜T, and described device comprises:

The present invention optimizes the display effect of LCDs by adjusting the time period illuminate during opening time that described LCDs shows many groups backlight of respective image occurs in this image scanning in the simple eye image on LCDs (left-eye image or the eye image) scanning process.Backlight is controlled in the mode of scanning, namely reach the LCDs display screen of the stable control mode of opening synchronously corresponding backlight group at the liquid crystal deflecting element of described LCDs, opening of its backlight constantly is opening constantly of first group of backlight, close moment is the close moment of last group backlight, the opening time of backlight is carved into a period of time between last group backlight close moment when being opening of first group of backlight, wherein have at least one group of backlight to be in open mode in described opening time.Backlight is controlled with synchronous unfolding mode, it is the LCDs of the control mode that opens and closes simultaneously of many groups backlight corresponding to described LCDs, its moment of opening backlight is the moment that the backlight group is opened simultaneously, the backlight close moment is the moment that the backlight group is closed simultaneously, and the opening time of backlight is that the backlight group is opened a period of time between the moment and the while close moment simultaneously.Being sweep time that time of scanning one frame left-eye image or a frame eye image is 1/120ms for LCDs one two field picture of 120Hz, is that in LCDs one frame left-eye image of picture disply or the time of eye image to be arranged be 1/240ms to scanning one frame for LCDs one two field picture of 240Hz sweep time.

The backlight control method of 3D LCDs of the present invention, in two field picture scan period, the scanning area that the opening time interscan of backlight group is in the liquid crystal molecule steady state (SS) is good viewing area, the image display effect that is in the good viewing area is better, the adjustment of the time period that the opening time of backlight group in every two field picture scanning process is occured is in fact the adjustment to good scanning viewing area, namely to the adjustment of the scan line that comprises in the good scanning viewing area, also namely the good image-region of the display effect of a two field picture in the adjustment of the position of LCDs.During a few frame left-eye image show, adjust respectively backlight opening constantly and close moment during each frame left-eye image shows, so that the continuous left-eye image of several frames show during the union of backlight opening time equal sweep time of a two field picture, it is in fact during a few frame left-eye image show, making the union of scan line of the good viewing area of a few frame left-eye image equal all scan lines of LCDs, also is the good image-region of display effect of a few frame left-eye image equals LCDs in the union of the shared image-region of LCDs viewing area; During a few frame eye image show, adjust respectively backlight opening constantly and close moment during each frame eye image shows, so that the continuous eye image of several frames show during the union of backlight opening time equal sweep time of a two field picture, it is in fact during a few frame eye image show, making the union of scan line of the good viewing area of a few frame eye image equal all scan lines of LCDs, also is the good image-region of display effect of a few frame eye image equals LCDs in the union of the shared image-region of LCDs viewing area; The image display effect of the present invention's integral body of LCDs during by said method has had largely and has improved.

Embodiment 1:

The present embodiment 3D LCD screen backlight control method, 3D LCDs take right and left eyes image display frequency as 120hz describes as example, unfolding mode backlight is scan mode in the present embodiment, namely reaches stable backlight group corresponding to this part LCDs of opening synchronously when the liquid crystal deflecting element of LCDs.This enforcement at 42 inches, comprises on the 3D LCDs of 1080 line scanning row that in the scanning procedure for displaying, the sequential of opening of backlight group is that example is introduced with 5 continuous frame left-eye image and 5 frame eye image.

As shown in Figure 2, the method for controlling backlight thereof of the present embodiment 3D LCDs, described LCDs, illuminate the demonstration of carrying out respectively left-eye image and eye image by 6 groups of backlights, the time that first group of backlight is carved into when opening between last group backlight close moment is 6.3ms, with the predetermined opening time of the whole 6.3ms of the opening time of 6 groups of backlights as backlight, high level represents backlight and opens in the drawings, and low level represents backlight and closes.

In first frame left-eye image L1 scan period, the backlight opening time occurs in by the initial time of left-eye image scanning after continued 6.3ms, and the initial scan line that this two field picture is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; In second frame left-eye image L2 scan period, the moment of time of origin after LCDs begins to scan 1ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; In the 3rd frame left-eye image L3 scan period, the moment of time of origin after LCDs begins to scan 2ms of adjusting the backlight opening time opens backlight until the 3rd frame left-eye image end of scan, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; Thus three frame left-eye image scan periods, the union of backlight opening time equals the sweep time of a two field picture, and the good display effect zone of the three frame left-eye image that namely show continuously on LCDs equals whole LCDs.

The first frame eye image R1 scan period that after described the first frame left-eye image, shows, the backlight opening time of opening of backlight occurs in by the initial time of eye image R1 scanning after continued 6.3ms, and the initial scan line that this two field picture is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; The second frame eye image R2 scan period that after described the second frame left-eye image, shows, the moment of time of origin after LCDs begins to scan 2ms of adjusting the backlight opening time opens backlight until the second frame eye image end of scan, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The union of 2 frame left-eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 2 frame eye image that namely show continuously on LCDs equals whole LCDs.

Equally, in the 4th frame left-eye image L4 scan period, the backlight opening time of opening of backlight occurs in by the initial time of left-eye image L4 scanning after continued 6.3ms, and the initial scan line that this two field picture is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; In the 5th frame left-eye image L5 scan period, the moment of time of origin after LCDs begins to scan 2ms of adjusting the backlight opening time opens backlight until the 5th frame left-eye image end of scan, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The union of 2 frame left-eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 2 frame left-eye image that namely show continuously on LCDs equals whole LCDs.

Equally, during liquid crystal display screen display the 3rd frame eye image R3, the moment of time of origin after LCDs begins to scan 1ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; In the 4th frame eye image R4 scan period, adjust the backlight opening time and occur in by the initial time of eye image scanning after continued 6.3ms, the initial scan line that this two field picture is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; In the 5th frame eye image R5 scan period, the moment of time of origin after LCDs begins to scan 2ms of adjusting the backlight opening time opens backlight until the 5th frame eye image end of scan, and it is better that this two field picture is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The union of 3 frame eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 3 frame eye image that namely show continuously on LCDs equals whole LCDs.

Not limiting in the above-described embodiments the time period that backlight closes distributes between several two field pictures, when not limiting between several two field pictures, the adjusting of backlight time of origin yet, order and rule that backlight is adjusted, satisfy a few frame left-eye image scan period, the union of backlight opening time is the sweep time of a two field picture, a few frame eye image scan period, the union of backlight opening time is to get final product the sweep time of a two field picture.

Accordingly, realize the device of the backlight control method of above-described embodiment 3D LCDs, the present embodiment 3D LCD screen backlight control device, comprise 6 groups of respectively backlight and described backlight control circuits that backlight is electrically connected of organizing of a plurality of scanning areas of corresponding LCDs more, described backlight control circuit is electrically connected the image controller of described 3D LCDs, the synchronous pwm signal of image controller output and the field frequency of the image of liquid crystal display screen display is to backlight control circuit, backlight control circuit is controlled the opening and closing of 6 groups of backlights because backlight employing scan mode control in the present embodiment, then during a two field picture shows 6 groups of backlights open constantly and close moment different, therefore adopt 6 road pwm signals to control respectively the opening and closing of 6 groups of backlights.

The embodiment of corresponding said method, in first frame left-eye image L1 scan period, be in high level state at first via pwm signal corresponding to the first frame left-eye image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In second frame left-eye image L2 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 1ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In the 3rd frame left-eye image L3 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always.

The embodiment of corresponding said method, in first frame eye image R1 scan period, be in high level state at first via pwm signal corresponding to the first frame eye image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In second frame eye image R2 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always.

The embodiment of corresponding said method, in the 4th frame left-eye image L4 scan period, be in high level state at first via pwm signal corresponding to image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In the 5th frame left-eye image L5 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always.

The embodiment of corresponding said method, in the 3rd frame eye image R3 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 1ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In the 4th frame eye image R4 scan period, be in high level state at first via pwm signal corresponding to image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; In the 5th frame eye image R5 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always.

Contrast prior art, show the control mode of 5 frame left-eye image and 5 frame eye image backlights in LCDs.As shown in Figure 1, all occur in the interlude section of scanning at a two field picture scan period opening time backlight, the synchronous backlight that the liquid crystal molecule of the scan line of assurance medium position reaches steady state (SS) is in opening, although optimized the image quality effect at the middle part of every two field picture, but sacrificed the image quality of the image that is in the LCDs upper and lower, caused the brightness irregularities of LCDs.

A kind of LCD TV comprises the backlight control apparatus of LCDs and LCDs, and wherein said backlight control apparatus is above-mentioned backlight control apparatus.

Embodiment 2:

The present embodiment 3D LCD screen backlight control method, the 3D LCDs take right and left eyes image display frequency as 120hz describe as example, and the 3 frame left-eye image and the 3 frame eye image that show continuously on LCDs are a display unit.Unfolding mode backlight is scan mode in the present embodiment, namely reaches stable backlight group corresponding to this part LCDs of opening synchronously when the liquid crystal deflecting element of LCDs.The 3 frame left-eye image that this enforcement shows continuously with a display unit and 3 frame eye image are at 55 cun, comprise on the 3D LCDs of 1080 line scanning row that in the scanning procedure for displaying, the sequential of opening of backlight group is that example is introduced.

As shown in Figure 4, the method for controlling backlight thereof of the present embodiment 3D LCDs, described LCDs, illuminate the demonstration of carrying out respectively left-eye image and eye image by 6 groups of backlights, the time that first group of backlight is carved into when opening between last group backlight close moment is 6.3ms, the mode that backlight scanning is opened is opened backlight and is namely reached stable backlight group corresponding to this part LCDs of opening synchronously at the liquid crystal deflecting element of LCDs, the opening time of 6 groups of backlights is whole, 6.3ms be the opening time that backlight is predetermined, zone1 to zone6 has represented respectively 6 groups of backlights and has been in open mode in the drawings.

In first frame left-eye image L1 scan period, the backlight opening time occurs in by the initial time of left-eye image scanning after continued 6.3ms, and the initial scan line that this frame left-eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; The first frame eye image R1 scan period that after described the first frame left-eye image, shows, the backlight group open sequential and the first frame left-eye image to open sequential identical, the initial scan line that this frame eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; In second frame left-eye image L2 scan period, the moment of time of origin after LCDs begins to scan 1ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; The second frame eye image R2 scan period that after described the second frame left-eye image, shows, the backlight group open sequential and the second frame left-eye image to open sequential identical, it is better that this frame eye image is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; In the 3rd frame left-eye image L3 scan period, the moment of time of origin after LCDs begins to scan 2ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The 3rd frame eye image R3 scan period that after described the 3rd frame left-eye image, shows, the backlight group open sequential and the 3rd frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The union of 3 frame left-eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 3 frame left-eye image that namely show continuously on LCDs equals whole LCDs.In like manner, the union of 3 frame eye image scan period backlight opening times equals the sweep time of a two field picture, and the good display effect zone of the 3 frame eye image that namely show continuously on LCDs equals whole LCDs.

A display unit comprises 3 frame left-eye image and 3 frame eye image totally 6 two field pictures in above-described embodiment, the multiframe left-eye image that then shows continuously on LCDs and eye image scan period, corresponding backlight circulates as the cycle take the sequential of opening of the backlight described in above-described embodiment.

The present embodiment and embodiment 1 adjust the sequential of opening of backlight equally, but the present embodiment, take 3 frame left-eye image as one group, make the union of the good scanning area of 3 two field pictures equal the scanning area of LCDs, take 3 frame eye image as one group, make the union of the good scanning area of 3 two field pictures equal the scanning area of LCDs, and the backlight of an adjacent frame left-eye image and eye image to open sequential identical, simplified the control of backlight; The time difference of opening the moment and close moment of the backlight of two adjacent frame left-eye image is fixed, and compensated the display effect of the image that is in the LCDs upper and lower that is sacrificed in the prior art for 1.65ms, when making the conversion of per two frame left-eye image and eye image, time interval part between the start-up time of the backlight of the close moment of the backlight of previous frame left-eye image and next frame eye image is consistent, can avoid the oversize flicker that causes LCDs of this time interval, be convenient to simultaneously the control of backlight.

As shown in Figure 4, the shutter glasses that cooperates described LCDs in the present embodiment, liquid crystal deflecting element at the left eyeglass Glass_L of the moment shutter glasses that the backlight of corresponding left-eye image is opened reaches steady state (SS), closes the left eye sheet in the moment that backlight is closed; Liquid crystal deflecting element at the right eyeglass Glass_R of the moment shutter glasses that the backlight of corresponding eye image is opened reaches steady state (SS), closes the right eye sheet in the moment that backlight is closed.

Accordingly, the present embodiment 3D LCD screen backlight control device, comprise 6 groups of respectively backlight and described backlight control circuits that backlight is electrically connected of organizing of a plurality of scanning areas of corresponding LCDs more, described backlight control circuit is electrically connected the image controller of described 3D LCDs, the synchronous pwm signal of image controller output and the field frequency of the image of liquid crystal display screen display is to backlight control circuit, backlight control circuit is controlled the opening and closing of 6 groups of backlights, because backlight adopts scan mode control in the present embodiment, then during a two field picture shows 6 groups of backlights open constantly and close moment different, therefore adopt 6 road pwm signals to control respectively the opening and closing of 6 groups of backlights.For realizing that backlight control circuit also comprises chronotron, counter and reproducer described in method the present embodiment corresponding to the present embodiment.

Wherein, described chronotron, be used for when image control unit is exported the first frame left-eye image sweep signal, exporting the control signal of described image control unit output to backlight control circuit, at the initial time of this image scanning, backlight control circuit control backlight is opened and is continued and closes behind the 6.3ms; When image controller is exported the 3rd frame left-eye image, described chronotron is exported to described backlight control circuit with the control signal of the controller output pre-timing difference of delaying time, and described backlight control circuit synchro control backlight behind the pre-timing difference of this image scanning is opened and continued to the finish time of this image scanning and closes; When image controller is exported the second frame left-eye image, described chronotron is exported to described backlight control circuit with the control signal of the described image controller output pre-timing difference of delaying time, and described backlight control circuit synchro control backlight behind the pre-timing difference of this image scanning is opened and continued 6.3ms and closes.

Described counter for the pre-timing difference that calculates 3 frame left-eye image and pre-timing difference, calculates the value of described pre-timing difference and described pre-timing difference and this value is fed back to described delay unit.

Described reproducer, be used for the adjacent described first frame left-eye image of described image demonstration group and described the first frame eye image scan period successively, the backlight of described left-eye image is opened in the time synchronized that this image scanning begins, described reproducer will be stored, and feeding back to described backlight control circuit, described backlight control circuit is adjusted the backlight of described the first frame eye image and is also opened in the time synchronized that this image scanning begins; The unfolding mode of adjacent described the second frame left-eye image and the backlight of described the second frame eye image is as the same; The unfolding mode of adjacent described the 3rd frame left-eye image and the backlight of described the 3rd frame eye image is as the same.

Corresponding said method embodiment, the device of the present embodiment, described controller comprises delay unit and computing unit, described computing unit has the frame number of 3 frame left-eye image and 3 frame eye image according to an image-display units of controller output, during calculating adjacent two frame left-eye image and showing backlight open constantly and the time difference of close moment is respectively 1ms, the time difference of opening the moment and close moment of backlight was respectively 1ms during adjacent two frame eye image showed, this result is exported to delay unit, delay unit is delayed time to 6 road pwm signals respectively according to this time difference result.

In first frame left-eye image L1 scan period, be in high level state at first via pwm signal corresponding to the first frame left-eye image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the first frame eye image R1 shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; In second frame left-eye image L2 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 1ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the second frame eye image R2 shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; In the 3rd frame left-eye image L3 scan period, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always; During the 3rd frame eye image R3 shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows.

Contrast prior art, show the control mode of 3 frame left-eye image and 3 frame eye image backlights in LCDs.As shown in Figure 3, all occur in the interlude section of scanning at a two field picture scan period opening time backlight, the synchronous backlight that the liquid crystal molecule of the scan line of assurance medium position reaches steady state (SS) is in opening, although optimized the image quality effect at the middle part of every two field picture, but sacrificed the image quality of the image that is in the LCDs upper and lower, caused the brightness irregularities of LCDs.Of the prior art, cooperate the sequential of opening of the shutter glasses of 3D LCDs to reach steady state (SS) at the liquid crystal deflecting element of the left eyeglass Glass_L of the moment shutter glasses that the backlight of corresponding left-eye image is opened equally, close the left eye sheet in the moment that backlight is closed; Liquid crystal deflecting element at the right eyeglass Glass_R of the moment shutter glasses that the backlight of corresponding eye image is opened reaches steady state (SS), closes the right eye sheet in the moment that backlight is closed.The enforcement of the present embodiment need to be with left eye sheet and right eye eyeglass open sequential adjustment.

Embodiment 3:

The present embodiment 3D LCD screen backlight control method, the 3D LCDs take right and left eyes image display frequency as 240hz describe as example, and the 3 frame left-eye image and the 3 frame eye image that show continuously on LCDs are a display unit.Unfolding mode backlight is flashing mode in the present embodiment, i.e. the control mode that opens and closes simultaneously of backlight group.The 3 frame left-eye image that this enforcement shows continuously with a display unit and 3 frame eye image are at 60 inches, comprise on the 3D LCDs of 1080 line scanning row that in the scanning procedure for displaying, the sequential of opening of backlight group is that example is introduced.

As shown in Figure 6, the method for controlling backlight thereof of the present embodiment 3D LCDs, described LCDs, illuminate the demonstration of carrying out respectively left-eye image and eye image by 6 groups of backlights, the time that first group of backlight is carved into when opening between last group backlight close moment is 2ms, the mode that backlight scanning is opened is the control mode control that 6 groups of backlights are opened simultaneously, be the predetermined opening time of backlight with the opening time 2ms of 6 groups of backlights, PWM has represented respectively 6 groups of backlights and has been in open mode in the drawings.

In first frame left-eye image L1 scan period, the backlight opening time occurs in by the initial time of left-eye image scanning after continued 2ms, and the initial scan line that this frame left-eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 2ms interscan better; The first frame eye image R1 scan period that after described the first frame left-eye image, shows, the backlight group open sequential and the first frame left-eye image to open sequential identical, the initial scan line that this frame eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 2ms interscan better; In second frame left-eye image L2 scan period, the moment of time of origin after LCDs begins to scan 1.075ms of adjusting the backlight opening time opens backlight and lasting 2ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1.75ms to 3.075ms of LCDs; The second frame eye image R2 scan period that after described the second frame left-eye image, shows, the backlight group open sequential and the second frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1.75ms to 3.075ms of LCDs; In the 3rd frame left-eye image L3 scan period, the moment of time of origin after LCDs begins to scan 2.15ms of adjusting the backlight opening time opens backlight and lasting 2ms closes later on backlight, this frame left-eye image be in LCDs to finish the display effect of scanning area of scanning to the moment that image scanning finishes at 2.15ms better; The 3rd frame eye image R3 scan period that after described the 3rd frame left-eye image, shows, the backlight group open sequential and the 3rd frame left-eye image to open sequential identical, this frame left-eye image be in LCDs to finish the display effect of scanning area of scanning to the moment that image scanning finishes at 2.15ms better; The union of 3 frame left-eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 3 frame left-eye image that namely show continuously on LCDs equals whole LCDs.In like manner, the union of 3 frame eye image scan period backlight opening times equals the sweep time of a two field picture, and the good display effect zone of the 3 frame eye image that namely show continuously on LCDs equals whole LCDs.

The present embodiment, take 3 frame left-eye image as one group, make the union of the good scanning area of 3 two field pictures equal the scanning area of LCDs, take 3 frame eye image as one group, make the union of the good scanning area of 3 two field pictures equal the scanning area of LCDs, and it is identical that an adjacent frame left-eye image and the backlight of eye image are opened sequential, simplified the control of backlight; The time difference of opening the moment and close moment of the backlight of two adjacent frame left-eye image is fixed, and compensated the display effect of the image that is in the LCDs upper and lower that is sacrificed in the prior art for 1.075ms, when making the conversion of per two frame left-eye image and eye image, time interval part between the start-up time of the backlight of the close moment of the backlight of previous frame left-eye image and next frame eye image is consistent, can avoid the oversize flicker that causes LCDs of this time interval, be convenient to simultaneously the control of backlight.

As shown in Figure 6, cooperate the shutter glasses of described LCDs in the present embodiment, because the next frame image of the first frame left-eye image L1 is the first left picture black L1/B, the next frame image of the first frame eye image R1 is the first right picture black R1/B; The next frame image of the second frame left-eye image L2 is the second left picture black L2/B, and the next frame image of the second frame eye image R2 is the second right picture black R2/B; The next frame image of the 3rd frame left-eye image L3 is the 3rd left picture black L3/B, and the next frame image of the 3rd frame eye image R3 is the 3rd right picture black R3/B; The liquid crystal molecule of the left eyeglass lens Glass_L of shutter glasses deflects when left picture black shows, the liquid crystal molecule of the right eye eyeglass Glass_R of shutter glasses deflects when right picture black shows.

Accordingly, realize the device of the backlight control method of above-described embodiment 3D LCDs, the present embodiment 3D LCD screen backlight control device, comprise 6 groups of respectively backlight and described backlight control circuits that backlight is electrically connected of organizing of a plurality of scanning areas of corresponding LCDs more, described backlight control circuit is electrically connected the image controller of described 3D LCDs, the synchronous pwm signal of image controller output and the field frequency of the image of liquid crystal display screen display is to backlight control circuit, backlight control circuit is controlled the opening and closing of 6 groups of backlights, because backlight adopts scan mode control in the present embodiment, then during a two field picture shows 6 groups of backlights open constantly identical with close moment, therefore adopt 1 road pwm signal to control respectively the opening and closing of 6 groups of backlights.

Corresponding said method embodiment, the device of the present embodiment, comprise equally that with above-mentioned embodiment 2 described backlight controllers described controller comprises chronotron, counter and reproducer, the identical function of its realization, described computing unit has the frame number of 3 frame left-eye image and 3 frame eye image according to an image-display units of controller output, during calculating adjacent two frame left-eye image and showing backlight open constantly and the time difference of close moment is respectively 1.085ms, the time difference of opening the moment and close moment of backlight was respectively 1.085ms during adjacent two frame eye image showed, this result is exported to delay unit, delay unit is according to this time difference result, and pwm signal is delayed time.

In first frame left-eye image L1 scan period, be in high level state at the first frame left-eye image 6 groups of pwm signals corresponding to backlight scanning zero hour, pwm signal was in low level state after image scanning had continued 2ms; During the first frame eye image R1 shows, the pwm signal of output during pwm signal difference repeatedly output previous frame left eye figure shows; In second frame left-eye image L2 scan period, the pwm signal that backlight is corresponding behind image scanning 1.085ms is in high level state, and image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 2ms; During the second frame eye image R2 shows, the pwm signal of output during pwm signal difference repeatedly output previous frame left eye figure shows; In the 3rd frame left-eye image L3 scan period, the pwm signal that backlight is corresponding behind image scanning 3.085ms is in high level state, and pwm signal is in high level until this image scanning finishes always; During the 3rd frame eye image R3 shows, the pwm signal of output during pwm signal difference repeatedly output previous frame left eye figure shows.

Contrast prior art, show the control mode of 3 frame left-eye image and 3 frame eye image backlights in LCDs.As shown in Figure 5, all occur in the interlude section of scanning at a two field picture scan period opening time backlight, the synchronous backlight that the liquid crystal molecule of the scan line of assurance medium position reaches steady state (SS) is in opening, although optimized the image quality effect at the middle part of every two field picture, but sacrificed the image quality of the image that is in the LCDs upper and lower, caused the brightness irregularities of LCDs.Of the prior art, because the next frame image of the first frame left-eye image L1 is the first left picture black L1/B, the next frame image of the first frame eye image R1 is the first right picture black R1/B; The next frame image of the second frame left-eye image L2 is the second left picture black L2/B, and the next frame image of the second frame eye image R2 is the second right picture black R2/B; The next frame image of the 3rd frame left-eye image L3 is the 3rd left picture black L3/B, and the next frame image of the 3rd frame eye image R3 is the second right picture black R3/B; The liquid crystal molecule of the left eyeglass lens Glass_L of shutter glasses deflects when left picture black shows, the liquid crystal molecule of the right eye eyeglass Glass_R of shutter glasses deflects when right picture black shows.Therefore the LCDs of the present embodiment does not need to adjust the sequential of opening of lens in use.

Embodiment 4:

The present embodiment 3D LCD screen backlight control method, the 3D LCDs take right and left eyes image display frequency as 120hz describe as example, and the 5 frame left-eye image and the 5 frame eye image that show continuously on LCDs are a display unit.Unfolding mode backlight is scan mode in the present embodiment, namely reaches stable backlight group corresponding to this part LCDs of opening synchronously when the liquid crystal deflecting element of LCDs.The 5 frame left-eye image that this enforcement shows continuously with a display unit and 5 frame eye image are at 55 cun, comprise on the 3D LCDs of 1080 line scanning row that in the scanning procedure for displaying, the sequential of opening of backlight group is that example is introduced.

The method for controlling backlight thereof of the present embodiment 3D LCDs, described LCDs, illuminate the demonstration of carrying out respectively left-eye image and eye image by 6 groups of backlights, the time that first group of backlight is carved into when opening between last group backlight close moment is 6.3ms, the mode that backlight scanning is opened is opened backlight and is namely reached stable backlight group corresponding to this part LCDs of opening synchronously at the liquid crystal deflecting element of LCDs, is the predetermined opening time of backlight with the whole 6.3ms of the opening time of 6 groups of backlights.

In first frame left-eye image scan period of liquid crystal display screen display, the backlight opening time occurs in by the initial time of left-eye image scanning after continued 6.3ms, and the initial scan line that this frame left-eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; The first frame eye image scan period that after described the first frame left-eye image, shows, the backlight group open sequential and the first frame left-eye image to open sequential identical, the initial scan line that this frame eye image is in LCDs is finished the display effect of image of scanning area of scanning to the 6.3ms interscan better; In second frame left-eye image scan period, the moment of time of origin after LCDs begins to scan 0.5ms of adjusting the backlight opening time opens backlight and lasting 6.8ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 0.5ms to 7.8ms of LCDs; The second frame eye image scan period that after described the second frame left-eye image, shows, the backlight group open sequential and the second frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 0.5ms to 7.8ms of LCDs; In the 3rd frame left-eye image scan period, the moment of time of origin after LCDs begins to scan 1ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; The 3rd frame eye image scan period that after described the 3rd frame left-eye image, shows, the backlight group open sequential and the 3rd frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1ms to 7.3ms of LCDs; In the 4th frame left-eye image scan period, the moment of time of origin after LCDs begins to scan 1.5ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1.5ms to 7.8ms of LCDs; The 4th frame eye image scan period that after described the 4th frame left-eye image, shows, the backlight group open sequential and the 4th frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 1.5ms to 7.8ms of LCDs; In the 5th frame left-eye image scan period, the moment of time of origin after LCDs begins to scan 1ms of adjusting the backlight opening time opens backlight and lasting 6.3ms closes later on backlight, and it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The 5th frame eye image scan period that after described the 5th frame left-eye image, shows, the backlight group open sequential and the 5th frame left-eye image to open sequential identical, it is better that this frame left-eye image is in the display effect of the scanning area of finishing scanning in 2ms to 8.3ms of LCDs; The union of 5 frame left-eye image scan period backlight opening times equals the sweep time of a two field picture thus, and the good display effect zone of the 5 frame left-eye image that namely show continuously on LCDs equals whole LCDs.In like manner, the union of 5 frame eye image scan period backlight opening times equals the sweep time of a two field picture, and the good display effect zone of the 5 frame eye image that namely show continuously on LCDs equals whole LCDs.

A display unit comprises 5 frame left-eye image and 5 frame eye image totally 10 two field pictures in above-described embodiment, the multiframe left-eye image that then shows continuously on LCDs and eye image scan period, corresponding backlight circulates as the cycle take the sequential of opening of the backlight described in above-described embodiment.

The present embodiment and embodiment 1 adjust the sequential of opening of backlight equally, but the present embodiment, take 5 frame left-eye image as one group, make the union of the good scanning area of 5 two field pictures equal the scanning area of LCDs, take 5 frame eye image as one group, make the union of the good scanning area of 5 two field pictures equal the scanning area of LCDs, and the backlight of an adjacent frame left-eye image and eye image to open sequential identical, simplified the control of backlight; The time difference of opening the moment and close moment of the backlight of two adjacent frame left-eye image is fixed, and compensated the display effect of the image that is in the LCDs upper and lower that is sacrificed in the prior art for 0.5ms, when making the conversion of per two frame left-eye image and eye image, time interval part between the start-up time of the backlight of the close moment of the backlight of previous frame left-eye image and next frame eye image is consistent, can avoid the oversize flicker that causes LCDs of this time interval, be convenient to simultaneously the control of backlight.

Accordingly, realize the device of the backlight control method of above-described embodiment 3D LCDs, the present embodiment 3D LCD screen backlight control device, comprise 6 groups of respectively backlight and described backlight control circuits that backlight is electrically connected of organizing of a plurality of scanning areas of corresponding LCDs more, described backlight control circuit is electrically connected the image controller of described 3D LCDs, the synchronous pwm signal of image controller output and the field frequency of the image of liquid crystal display screen display is to backlight control circuit, backlight control circuit is controlled the opening and closing of 6 groups of backlights, because backlight adopts scan mode control in the present embodiment, then during a two field picture shows 6 groups of backlights open constantly and close moment different, therefore adopt 6 road pwm signals to control respectively the opening and closing of 6 groups of backlights.

Corresponding said method embodiment, the device of the present embodiment, described backlight controller comprises equally that with above-mentioned embodiment 2 described controller comprises chronotron, counter and reproducer, the identical function of its realization, described computing unit has the frame number of 5 frame left-eye image and 5 frame eye image according to an image-display units of controller output, during calculating adjacent two frame left-eye image and showing backlight open constantly and the time difference of close moment is respectively 0.5ms, the time difference of opening the moment and close moment of backlight was respectively 0.5ms during adjacent two frame eye image showed, this result is exported to delay unit, delay unit is delayed time to 6 road pwm signals respectively according to this time difference result.

During the first frame left-eye image shows, be in high level state at first via pwm signal corresponding to the first frame left-eye image scanning first group of backlight zero hour, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the first frame eye image shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; During the second frame left-eye image is shown, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 0.5ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the second frame eye image shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; During the 3rd frame left-eye image is shown, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 1ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the 3rd frame eye image shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; During the 4th frame left-eye image is shown, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 1.5ms, the rest may be inferred the second road PWM, Third Road PWM, the four road PWM, the five road PWM, image scanning has continued that the pwm signal of the 6th group of backlight is in low level state behind the 6.3ms; During the 4th frame eye image shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows; During the 5th frame left-eye image, first group of first via pwm signal corresponding to backlight is in high level state behind image scanning 2ms, the rest may be inferred the second road PWM, the five road PWM, the four road PWM, the five road PWM, the six road pwm signal of the 6th group of backlight are in high level until this image scanning finishes always; During the 5th frame eye image shows, 6 road pwm signals of output during 6 road pwm signals difference repeatedly output previous frame left eye figure shows.

Contrast prior art, show the control mode of 3 frame left-eye image and 3 frame eye image backlights in LCDs.All occur in the interlude section of scanning at a two field picture scan period opening time backlight, the synchronous backlight that the liquid crystal molecule of the scan line of assurance medium position reaches steady state (SS) is in opening, although optimized the image quality effect at the middle part of every two field picture, but sacrificed the image quality of the image that is in the LCDs upper and lower, caused the brightness irregularities of LCDs.

Above; be preferred embodiment of the present invention only, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; 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

1. the backlight control method of a 3D LCDs, described 3D LCDs includes backlight control circuit and backlight, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be equal T the sweep time of a described frame left-eye image or eye image, one frame left-eye image or eye image scan period, described backlight reaches at the liquid crystal deflecting element of described glasses to be opened after stable, and lasting opening time is t, and t＜T, it is characterized in that, described method comprises:

2. the control method of the backlight of 3D LCDs according to claim 1 is characterized in that, described method also comprises:

In described left image demonstration group, also comprise the moment that the middle left-eye image scanning of at least one frame begins rear pre-timing difference, simultaneously, described backlight control circuit is controlled and is opened corresponding described backlight, and the unlatching of described backlight continues at t in the time period;

3. the control method of the backlight of 3D LCDs according to claim 2 is characterized in that, described method also comprises:

The computing method of described pre-timing difference are: a described frame left-eye image or eye image sweep time T and mistiming of the backlight opening time t of a frame left-eye image or eye image scan period be T-t, in the middle of then described left-eye image or described in the middle of i two field picture in the eye image, in the pre-timing difference of i two field picture be (i-1) * (T-t)/N.

4. the control method of the backlight of 3D LCDs according to claim 3 is characterized in that, described method also comprises:

The left-eye image that same described 3D rendering comprises and eye image be scan period successively, the moment of t1 time after the described left-eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and the unlatching of described backlight continues at t in the time period; In the moment of t2 time after the described eye image scanning beginning, simultaneously, corresponding described backlight is opened in described backlight control circuit control, and described backlight opens and continue at t in the time period, wherein t1=t2.

5. the method for controlling backlight thereof of 3D LCDs according to claim 1 is characterized in that, described N is specially at 3 o'clock, and described method is specially:

6. the control device of the backlight of a 3D LCDs, described 3D LCDs includes backlight control circuit and backlight, wherein said backlight control circuit is electrically connected the image controller of described 3D LCDs, described 3D LCDs is equipped with shutter type 3 D spectacles, when receiving left-eye image that 3D rendering comprises and eye image and carry out alternate sweep and show, described backlight control circuit cooperates control to open or close described backlight, wherein, be T the sweep time of a described frame left-eye image or a frame eye image, during one frame left-eye image or eye image show, described backlight is opened after the liquid crystal deflecting element of described glasses is stable, lasting opening time is t, and t＜T is characterized in that, described device comprises:

7. the backlight source control device of LCDs according to claim 6 is characterized in that,

Described backlight control circuit comprises chronotron, exports to described backlight control circuit for the control signal of described image controller output is delayed time;

8. the backlight control apparatus of 3D LCDs according to claim 7 is characterized in that,

Described backlight control circuit also comprises counter, is used for calculating the value of described pre-timing difference and this value being fed back to described delay unit.

9. the control device of the backlight of 3D LCDs according to claim 8 is characterized in that,

Described backlight control circuit also comprises reproducer, in adjacent described left-eye image and described eye image successively scan period, described backlight control circuit output control signal when the rear t1 of described left-eye image scanning beginning is constantly controlled described backlight and is opened, and described backlight continues at t in the time period; Described reproducer is for the value of storing described t1, and the value of described t1 exported to described backlight control circuit, described backlight control circuit is controlled described backlight according to value output control signal when the rear t2 of described eye image scanning beginning constantly of described t1 and is opened, and described backlight continued at t in the time period, wherein t1=t2.

10. LCD TV comprises the backlight control apparatus of LCDs and LCDs, and it is characterized in that: described backlight control apparatus is the backlight source control device of the arbitrary described 3D LCDs of claim 6 to 9.