KR20140042972A - Method and apparatus for overdrive technology to minimize cross-talk and motion blur of 3d display - Google Patents

Abstract

The present invention relates to an overdrive modulation method and an apparatus for minimizing the cross-talk and the motion blur of a 3D display. An image signal is successively inputted to a left eye frame, a black frame, a right eye frame, a block frame (L-B-R-B). It is overdriven by a 3D first lookup table which stores an overdrive value which reduces the cross-talk with regard to a stopped image. It is overdriven by a 3D second lookup table which stores an overdrive value which reduces the motion blur with regard to a moving image. Thereby, the motion blur phenomenon of a 2D image can be reduced, and the cross-talk of the 3D image and the motion blur together can be reduced. [Reference numerals] (310) Frame memory; (320) Overdrive control unit; (330) Image output unit; (AA) Input image signal; (BB) 3D first lookup table; (CC) 3D second lookup table; (DD,EE) Output image signal(3D mode)

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overdrive modulation method and apparatus for minimizing crosstalk and motion blur in a three-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to overmodulation of an apparatus for driving a liquid crystal display (LCD) or the like, and more particularly to an overdrive modulation method for reducing influence of crosstalk and motion blur generated in a three- ) Modulation, a method and an apparatus for enabling a user to directly find a correction value of overdrive modulation.

At present, a liquid crystal display (LCD) is widely used as a video display device, but the liquid crystal display has a disadvantage in that the response characteristic of the liquid crystal itself is slow. In general, a CRT or OLED has a fast response characteristic of several microseconds, while a liquid crystal has a slow response characteristic of several tens of milliseconds. Since the slow response characteristic of such a liquid crystal display device causes motion blur, various studies for improving the motion blur have been made.

As one of the methods for improving the response characteristic of the above-described liquid crystal display device, there is an overdrive technology. The overdriving modulation method is to apply a strong or weak voltage momentarily, that is, a correction value for a change in the luminance value, so that the luminance change over time becomes faster when the luminance value changes with time. Although there are disadvantages in that the over-driving method has high cost and high power consumption, many studies have been conducted to improve the above.

Particularly, in the case of a three-dimensional liquid crystal display device, a motion blur problem caused by a slow response and a cross-talk problem in which a left eye image and a right eye image overlap are simultaneously generated. The overmodulation modulation method applied to the liquid crystal display device can not solve the above problem and a new overmodulation modulation method suitable for the three-dimensional liquid crystal display device is needed.

On the other hand, even in the case of a liquid crystal display device manufactured by the same process, the physical characteristics of components such as liquid crystal may be different from each other. In order to apply the over-driving modulation method to a liquid crystal display device, The value should be extracted and overmodulation should be applied. However, as described above, there is a time and cost problem in applying the overdrive modulation by extracting the correction value for each liquid crystal display device. Therefore, the manufacturer of the liquid crystal display device selects a method of extracting the representative correction value of each liquid crystal display device and applying it to all of the liquid crystal display devices, instead of extracting the correction value for each liquid crystal display device and applying the overdrive modulation.

However, in the liquid crystal display device to which the representative correction value is applied as described above, the problem of motion blur or crosstalk still occurs because the correction value suitable for the device is not applied in spite of the application of the overdrive modulation.

Therefore, in a liquid crystal display device for displaying a three-dimensional image, it is possible to reduce the motion blur phenomenon and the crosstalk phenomenon, and it is possible to find and apply the correction value of the overdrive modulation suitable for the user's own three- There is a need for a method.

The present invention is intended to improve the driving method in a liquid crystal display device displaying the above-described conventional three-dimensional image, and it is an object of the present invention to provide a three- The present invention provides an over-driving modulation method and apparatus for minimizing crosstalk and motion blur in a three-dimensional image display apparatus capable of reducing both a crosstalk phenomenon and a motion blur phenomenon of a 2D image.

In order to achieve the above object, an over-driving modulation method for minimizing crosstalk and motion blur in a three-dimensional image display apparatus according to the present invention is characterized in that the image signal is a left eye frame, a black frame, a right eye frame, a black frame (LBRB) Dimensional three-dimensional look-up table in which an over-driving value for reducing cross-talk is stored for the still image, and a three-dimensional second look-up table for storing the over-driving value for reducing the motion blur for the moving image. And performing overdrive using a look-up table.

The three-dimensional first look-up table includes: (1) a video signal of a frame before the left eye and a video signal of a frame of the left eye are the same, a video signal of a frame before the right eye is the same as a video signal of the right eye current frame, When the signal is different, it is used when switching from the frame before the right eye to the frame of the left eye and switching from the left eye current frame to the right eye current frame, or (2) When the video signal of the previous frame in the right eye and the video signal of the current frame in the right eye are different and the right eye image signal and the left eye image signal are different from each other, when switching from the previous frame in the right eye to the current frame in the left eye, Frame, or (3) the image signal of the frame before the left eye and the frame image of the left eye present frame When the arbitrary video signal is different and the video signal of the previous frame in the right eye and the video signal of the current frame in the right eye are the same and the right eye image signal and the left eye image signal are different from each other, (4) When the video signal of the frame before the left eye and the video signal of the frame of the left eye are the same, and the video signal of the frame before the right eye differs from that of the frame of the right eye, When switching from the previous frame to the previous frame in the right eye and from the current frame in the left eye to the current frame in the right eye,

The three-dimensional second look-up table includes: (1) a video signal of a frame before a left eye and a video signal of a frame of a left eye different from a video signal of a left eye current frame; (2) the video signal of the previous frame is different from the video signal of the current frame of the left eye, and the video signal of the previous frame of the right eye and the current eye signal of the right eye are different from each other, When the video signal of the frame is the same, and the left and right eye current frame image signals are the same, the current image is shifted from the previous frame to the previous frame.

On the other hand, when the video signals of the previous frame of the left eye, the current frame of the left eye, the previous frame of the right eye, and the current frame of the right eye are all the same, the video signal of the current frame is output as it is.

The overdrive value of the three-dimensional first lookup table is formed by forming two patterns L-BOX and R-BOX having the same size, shape, and position in each of the left eye image frame and the right eye image frame, BOX, R-BOX, or R-BOX, the brightness of the overdrive control region OD1 or OD2 is set to the pattern L-BOX, R-BOX, It is extracted by adjusting the brightness compared with the background brightness.

Specifically, the over-driving value of the first look-up table is (1) the pattern L-BOX is displayed on the left eye image, the pattern R-BOX is displayed on the right eye image, A first step of forming and displaying the hyperdrive control areas OD1 and OD2 having the same size, shape and position, respectively; (2) a second step of setting the hyper-driving area OD1 and the gray level of the background screen to G1, and setting the gray level of the pattern L-BOX and R-BOX and the hyper-driving area OD2 to G2; (3) shutting off the right eye of the shutter glasses and adjusting the brightness of the OD1 so that the brightness of the over-driving area OD1 becomes equal to the brightness of the background screen; (4) When the brightness of the hyper-driving area OD1 is compared with the brightness of the background screen, and when they are the same, the gray level of the hyper-driving area OD1 is changed from the gray level G2 to G1, (OD _{G2 -} > _G1 ); (5) closing the left eye of the shutter glasses and adjusting the brightness of OD2 so that the brightness of the over-driving area OD2 becomes equal to the brightness of the pattern R-BOX; (6) The brightness of the overdrive control area OD2 is compared with the brightness of the pattern R-BOX. If the brightness of the overdrive control area OD2 is the same, the second over-driving value (OD _{G1 -> G2} ); (7) Shutting off the right eye of the shutter glasses and comparing the brightness of the overdrive adjustment region OD1 with the brightness of the background screen. If they are the same, the first overdrive value OD _{G2 -> Gl} and the second overdrive value (OD _{G1-> G2)} stored in the memory, a first overdrive the gray level of the area OD1 donggap if different (OD _{G2-> G1),} the second overdrive donggap the gray level of the region OD2 (OD _{G1 - > G2} ), and repeating the sixth step in the third step; . ≪ / RTI >

The overdrive value of the three-dimensional second look-up table is obtained by four patterns L1-BOX, L2-BOX, R1-BOX and R2-BOX having the same size and shape in each of the left eye image frame and right eye image frame in the same direction And the pattern L2-BOX is paired with the R2-BOX so as to scroll along the same locus, and one of the four patterns is displayed so that the pattern L1- The overdrive control area OD is set and displayed on one side of the scroll in the opposite direction of the scroll, and the brightness of the OD is adjusted by comparing the brightness of the overdrive control area OD with the brightness of the background screen.

On the other hand, the length of the area OD parallel to the scroll direction is set to be proportional to the scroll speed.

In order to obtain the over-driving value of the three-dimensional second look-up table, the four patterns are displayed so as to scroll downward, and the over-driving area OD is set on the upper part of the L1-BOX.

Specifically, the over-driving values of the second look-up table are as follows: (1) the overdrive control region OD is displayed on the left-eye image on the patterns L1-BOX and L2-BOX and on the pattern L1- BOX, R2-BOX, R2-BOX, R1-BOX, R2-BOX and the overdrive control region OD are scrolled downward at the same speed; (2) setting a gray level of the patterns L1-BOX, L2-BOX, R1-BOX, and R2-BOX to G2, setting the overdrive control area OD and the gray level of the background screen to G1; (3) adjusting the brightness of the hyper-driving area OD to match the brightness of the background screen G1; (4) When the brightness of the adjusted overdrive control region OD is compared with the brightness of the background screen, and when both are equal, the gray level of the overdrive control region OD at that time is changed from gray level G2 to G1 (OD _{G2 -> G 1} ) and storing the overdrive value (OD _{G2 - > G 1} ) in the memory, and if it is different, returning to the third step and repeating the fourth step .

The three-dimensional liquid crystal display device for performing the driving method of the liquid crystal display device according to the present invention comprises: a frame memory for storing input three-dimensional video signals on a frame basis; Dimensional lookup table and the three-dimensional second lookup table, wherein the three-dimensional first lookup table and the three-dimensional second lookup table are stored in correspondence with the correlation between the video signal stored in the frame memory and the currently input video signal, An over-driving control unit for over-driving and outputting a video signal with reference to any one of the second look-up tables; And an image output unit for receiving a video signal from the overriding control unit and outputting a three-dimensional image.

An over-driving modulation method and apparatus for minimizing crosstalk and motion blur in a three-dimensional image display apparatus according to the present invention is a method and apparatus for adjusting a crosstalk and a motion blur So that crosstalk and motion blur of the three-dimensional image can be reduced, and the image display quality of the liquid crystal display device can be enhanced.

1 is a block diagram schematically showing a configuration of an image display system to which a method of driving a three-dimensional liquid crystal display device according to an embodiment of the present invention is applied.
2 is a diagram illustrating timings of image display used in a three-dimensional image display apparatus according to an embodiment of the present invention.
3 (a) and 3 (b) are diagrams showing a program screen for finding a three-dimensional first lookup table according to an embodiment of the present invention;
4 (a) and 4 (b) are diagrams showing regions through the left eye and right eye in a program for finding a three-dimensional first look-up table according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method of extracting a three-dimensional first lookup table according to an embodiment of the present invention; FIG.
6A to 6D are tables for searching for correction values of a three-dimensional first look-up table and images before and after correction according to an embodiment of the present invention.
Figure 7 is an illustration of a three dimensional first lookup table extracted in accordance with one embodiment of the present invention.
8 (a) and 8 (b) are diagrams showing a program screen for finding a three-dimensional second lookup table according to an embodiment of the present invention;
FIG. 9 is a view showing the pattern of FIG. 8 in a 3D mode when glasses are not worn, according to an embodiment of the present invention.
10 is a flowchart illustrating a method of extracting a three-dimensional second lookup table according to an embodiment of the present invention.
11 is an illustration of a three-dimensional second look-up table extracted in accordance with an embodiment of the present invention.
12 is a configuration diagram showing a configuration of a three-dimensional liquid crystal display device according to an embodiment of the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, FIG. 1 schematically shows a configuration of an image display system to which an embodiment of the present invention is applied.

As shown in FIG. 1, the present invention can be constituted by a liquid crystal display device capable of displaying a three-dimensional image and a three-dimensional display glass. That is, the three-dimensional image is displayed in a shutter glass manner, and the liquid crystal display and the three-dimensional display glasses are synchronized with each other.

Next, FIG. 2 shows a timing chart of the three-dimensional image display in the image display system according to the embodiment of the present invention.

As shown in Fig. 2, the three-dimensional image display apparatus alternately displays the frames of the left image and the right image on the liquid crystal panel, and in synchronism therewith, the shutter of the three-dimensional display glasses is opened and closed, The user can see only the frame of the left eye image with the left eyeglasses, and only the frame of the right eye image with the right eye glasses. As such, different images are displayed on the left and right eyes of the user, so that the user can recognize the three-dimensional image in which the left eye image and the right eye image are fused.

2, in the embodiment of the present invention, a so-called black data insertion (BFI: Black Frame Insertion) driving method in which black data is inserted for each frame in order to reliably separate the left eye image and the right eye image . By performing the BFI driving in this way, the image displayed on the liquid crystal panel is composed of the left eye frame, the black frame, the right eye frame, and the black frame (L-B-R-B) in this order. Hereinafter, the left eye frame is referred to as an 'L' frame, the right eye frame as an 'R' frame, and the black frame as a 'B' frame.

Next, an over-driving modulation method and apparatus for minimizing crosstalk and motion blur in a three-dimensional image display apparatus according to an embodiment of the present invention will be described with reference to FIGS. 3 to 11. FIG.

Normally, when overdriving is applied to a three-dimensional image display apparatus, a correction value is used. A table in which these correction values are gathered is called a " lookup table ".

Hereinafter, a table storing a correction value for reducing the crosstalk phenomenon is referred to as a 'three-dimensional first lookup table', and a table storing a correction value for reducing a motion blur phenomenon is referred to as a ' Lookup table '.

Specifically, (1) the video signal of the frame before the left eye and the video signal of the frame of the left eye are the same, and the video of the frame before the right eye is the same Eye signal and the left eye image signal are different from each other when the signal of the current frame is the same as that of the right eye image and the left eye image signal is different from that of the left eye image, (2) if the video signal of the previous frame of the left eye differs from the video signal of the current frame of the left eye, the video signal of the previous frame of the right eye differs from the video signal of the current frame of the right eye, When switching from the previous frame in the right eye to the current frame in the left eye and the current frame in the left eye, (3) the video signal of the previous frame of the left eye and the video signal of the current frame of the left eye are different, and the video signal of the previous frame of the right eye and the video signal of the current frame of the right eye are the same, (4) the image signal of the frame before the left eye and the image signal of the frame of the left eye of the current frame are different from each other, When the video signal of the previous frame in the right eye and the video signal of the current frame in the right eye are different from each other, it is used when switching from the previous frame to the right eye and switching from the current frame to the right eye to the current frame.

The three-dimensional second look-up table is a table to be used for over-driving the spatially moving image. Specifically, (1) the video signal of the previous frame is different from the video signal of the current frame of the left eye, If the video signal and the video signal of the right eye current frame are different and when the left eye image signal and the right eye image signal are the same, it is used to switch from the previous frame to the left eye and the current frame to the left eye. If the video signal of the left eye current frame is different and the video signal of the previous frame of the right eye is the same as the video signal of the right eye current frame and the left eye current frame video signal and the right eye current frame video signal are the same, And is used for overdrive.

In addition, when the video signals of the previous frame of the left eye, the current frame of the left eye, the previous frame of the right eye, and the current frame of the right eye are all the same, the video signal of the current frame is directly output without applying the three-dimensional first look- .

Therefore, in order to reduce crosstalk and motion blur that occur in a three-dimensional image, the present invention provides a three-dimensional first lookup table and a three-dimensional second lookup table in which correction values applied at the same time are stored We propose a method that can be directly extracted by the user of the 3D image display device.

Hereinafter, with reference to FIG. 3 to FIG. 8, a method of extracting a three-dimensional first lookup table capable of minimizing crosstalk by a user in a three-dimensional image display apparatus according to an exemplary embodiment of the present invention will be described in detail As follows.

3 is a diagram illustrating a program screen required for searching for the 3D first lookup table according to the present invention.

FIG. 3 (a) is a view of a pattern displayed on the left and right eye frame images, in which two patterns having the same size, shape, and position are formed in each of the left eye image frame and the right eye image frame. In the present embodiment, the two patterns are set to have a rectangular shape for the sake of convenience, but it is also possible to set them to another arbitrary shape. Fig. 3 (b) is a description of the role of each pattern displayed in the left eye and right eye image frames in Fig. 3 (a).

The pattern in the left eye image frame is called L-BOX, and the pattern in the right eye image frame is called R-BOX. Also, the hyper-driving regions OD1 and OD2 having the same size, shape, and position are set in a portion of each of the patterns L-BOX and R-BOX. The overdrive control areas OD1 and OD2 are parts where the user directly adjusts the gray level of the video signal. In addition, the gray level of the background screen and L-BOX and R-BOX are fixed.

For reference, 'gray level' used in the present invention means an actual value of brightness information of a corresponding pattern, area or background screen included in a video signal, and 'brightness' means a corresponding pattern included in the inputted video signal, Means the degree of brightness of the corresponding pattern, area or background screen observed on the display after the gray level of the area or background screen is displayed through the display device. That is, 'to adjust the gray level' used below means to change the information value of the actual brightness of the corresponding pattern, area or background screen included in the video signal, and 'comparing brightness' Means that the degree of brightness of a corresponding pattern, area, or background screen displayed through a display device according to a gray level is compared through a human eye or a device.

When two patterns are set for each of the left and right image frames as described above, as shown in FIG. 4, when the right eye is blocked, the hyper-driving area OD1 and the pattern L-BOX are displayed in the left eye image frame , And if the left eye is blocked, the overdrive control area OD2 and the pattern R-BOX are displayed in the right eye image frame. Accordingly, the overdrive value of the three-dimensional first lookup table is obtained by comparing the brightness of the overdrive adjustment areas OD1 and OD2 with the brightness of the pattern L-BOX, R-BOX, or background, Can be extracted by adjusting the brightness of OD1 or OD2 so as not to occur.

More specifically, a method for extracting the three-dimensional first lookup table will be described in detail. FIG. 5 is a flowchart illustrating a method of extracting the three-dimensional first lookup table.

First, as described above, in the 3D mode of the 3D image display apparatus, a pattern L-BOX and a R-BOX having the same size, shape, and position are formed in the left and right eye image frames, The overdrive control areas OD1 and OD2 having the same size, shape, and position are formed on one side of the BOX (S101).

Next, the gray level of the background screen and the hyper-driving control area OD1 is set to G1, and the gray level of the OD2, L-BOX and R-BOX is set to an arbitrary G2 (S102).

The right eye of the shutter glasses is blocked, and the brightness of the OD1 is adjusted so that the brightness of the over-driving area OD1 coincides with the brightness of the background screen (S103).

The brightness of the hyper-driving area OD1 and the brightness of the background screen are compared. If they are the same, the first over-driving value (OD) at the time of switching the gray level of the over driving area OD1 from gray level G2 to G1 _{G2- > G1} ) (S104).

The left eye of the shutter glasses is shut off and the brightness of the OD2 is adjusted so that the brightness of the hyper-driving area OD2 coincides with the brightness of the R-BOX (S105).

The brightness of the overdrive adjustment region OD2 is compared with the brightness of the R-BOX. If they are the same, the second override value at the time of switching the gray level of the overdrive adjustment region OD2 from the gray level G1 to G2 OD _{G1- > G2} ) (S106).

(OD _{G2 - > G1} ) and a second over-driving value (" OD ") are obtained when the right eye of the shutter glasses is blocked and the brightness of the over- OD _{G1-> G2} ) is stored in the memory, and if it is different, the gray level of the overdrive control region OD1 is set to the first overdrive value ODG2- _{> G1} , the gray level of the overdrive control region OD2 is set to the second (ODG1- & gt _{; G2} ), and repeats the above-described step S106 in step S103 (S107).

The above-described three-dimensional first lookup table extraction method S101 to S107 proceeds with the above process while using a shutter glass. Particularly, a device capable of measuring brightness can be used in a part for comparing brightness, It is preferable to proceed with the above process using his or her own eyes.

FIG. 6 is a diagram illustrating a step of extracting a correction value of the three-dimensional first lookup table according to the present invention, and a left-right image before and after the correction.

As shown in FIG. 6 (a), in the above-described steps S101 to S104 for extracting the three-dimensional first lookup table, the gray level is influenced by the hyper-driving region OD2 having the gray level G2, (OD _{G2 - > G1} ) is adjusted by adjusting the brightness of the overdrive adjustment region OD1 so as to match the brightness of the background screen in order to correct for the cross over of the overdrive adjustment region OD1, Respectively. Accordingly, in the left eye image after correcting the gray level of the hyper-driving region OD1 to the first hyperbaric value OD _{G2-> G1} , the brightness of the hyper-driving region OD1 coincides with the brightness of the background screen, .

6 (b), in the above-described steps S105 to S106 for extracting the three-dimensional first lookup table, the gray level of the three-dimensional first lookup table is adjusted to the first hyperbaric value OD _{G2-> G1} , The crosstalk is generated in the hyper-driving region OD2 having the gray level G2 under the influence of the first region OD2, and the gray level of the hyper-driving region OD2 is adjusted to correct the second over- _{G1- > G2} ). Accordingly, in the right eye image after correcting the gray level of the hyper-driving region OD2 to the second hyperbaric value OD G1- _{> G2} , the brightness of the hyper-driving region OD2 coincides with the brightness of the R-BOX, So that the tok does not occur.

6 (c), in step S107 for extracting the three-dimensional first lookup table, the overdrive control area OD2 whose gray level is adjusted to the second overdrive value (ODG1- _{> G2} ) The crosstalk may occur in the hyper-driving region OD1 where the gray level is adjusted to the first hyper actuation value (OD _{G2 - > G1} ). When the crosstalk occurs in this way, The first overdrive value OD _{G2 -> G1} and the second overdrive value OD _{G1 -> G2} are again extracted by repeating the step S106 while adjusting the gray levels of the overdrive control regions OD1 and OD2 again. Accordingly, in the left eye image, the brightness of the controlled hyperdrive adjustment area OD1 coincides with the brightness of the desktop, resulting in no crosstalk.

As shown in FIG. 6 (d), when the first over-drive value (OD _{G2 -> G1} ) and the second over-drive value (OD G1- _{> G2} ) are finally extracted through the steps S101 to S107 , The gray level of which is adjusted to the second driving value (OD _{G1-> G2} ) by the hyper-driving area OD1 whose gray level is adjusted to the first hyper driver (OD _{G2-> G1} ) OD2 is no longer affected. Accordingly, in the right-eye image, the brightness of the hyper-driving region OD2 is displayed to be the same as the brightness of the R-BOX.

Through the extraction process of the three-dimensional first lookup table, it is possible to extract the over-driving value (correction value) when the gray level is converted into G2-> G1 and G1-> G2 in the stopped three-dimensional image, When the extraction process is performed for each of all the gray levels, a three-dimensional first lookup table as shown as an example in FIG. 7 can be extracted.

7, D _PF is the data of the previous frame, and D _CF is the data of the current frame. When the previous frame data is the left eye image and the current frame data is the right eye image when driving the three-dimensional image and vice versa, when the previous frame data is the right eye image and the current frame data is the left eye image, Dimensional first lookup table is applied.

Referring to FIG. 7, if the left eye image of the previous frame has 32 gray levels and the target value of the right eye image of the current frame is 96 gray levels, the over driving value should be corrected to 182 gray levels. If the corrected value is overdriven, the current frame will be able to display the 96-gray level luminance value, i.e., the target luminance value.

Next, with reference to FIGS. 8 to 11, a method for minimizing motion blur by a user in a three-dimensional image display apparatus according to an embodiment of the present invention will be described. FIG.

First, FIG. 8 shows an example of a program screen required for searching the three-dimensional second lookup table.

FIG. 8A is a view showing a pattern displayed on each of the left eye and right eye images, and FIG. 8B is a view explaining the role of each pattern in each of left and right eye images displaying an actual pattern.

First, in the 3D mode of the 3D image display apparatus, four patterns L1-BOX, L2-BOX, R1-BOX and R2-BOX having the same size and shape are formed in the left eye image frame and the right eye image frame, The L1-BOX and the L2-BOX are displayed, and the patterns R1-BOX and R2-BOX are displayed in the right eye image. In this case, the pattern L1-BOX and L2-BOX, R1-BOX, and R2-BOX are displayed to scroll in one direction, and in one embodiment of the present invention, BOX, and the pattern L2-BOX is paired with the R2-BOX and scrolled along the same trajectory.

Further, an overdrive control area OD, which can control a gray level on one side of the selected pattern in the opposite direction of the scroll, is selected and displayed by selecting any one of the four patterns.

FIG. 8 shows an example of the four patterns. The four patterns L1-BOX and L2-BOX, R1-BOX, and R2-BOX are set to have the same size, shape, And the overdrive adjustment region OD is displayed in a rectangular shape on the upper side of the pattern L1-BOX.

FIG. 9 is a view showing a pattern of the program shown in FIG. 8 in a 3D mode when glasses are not worn in a program screen for extracting the three-dimensional second lookup table according to an embodiment of the present invention.

When the four patterns are displayed while being scrolled in the lower direction of the left and right image screen, motion blur phenomenon occurs continuously in the upper region of each pattern. However, while continuously controlling the gray level of the hyper-driving region OD, the motion blur progressively decreases in the hyper-driving region OD and eventually the motion blur phenomenon does not occur in the hyper-driving region OD. Accordingly, the overdrive value of the three-dimensional second lookup table can be extracted by a method of adjusting the gray level of the overdrive control region OD by comparing it with the gray level of the background screen.

On the other hand, the length of the overdrive adjustment region OD parallel to the scroll direction, that is, 'D' in FIG. 8 (a) is set to be proportional to the scroll speed, and the unit thereof is a pixel per frame (ppf). For example, when moving at a speed of 1 ppf, the 'D' has a length of 1 pixel.

In the present embodiment, the hyperopia control region OD is displayed on the left eye image. However, the hyperopia control region OD may be displayed on the right eye image. Hereinafter, it will be described that the hyper-driving region OD is displayed on the left eye image.

Next, a specific method of extracting the over-driving correction value of the three-dimensional second look-up table will be described. FIG. 10 is a flowchart illustrating a method of extracting the three-dimensional second lookup table.

First, as described above, in order to extract the three-dimensional second lookup table, the patterns L1-BOX and L2-BOX are assigned to the left eye image of the three-dimensional image display apparatus, and the patterns R1-BOX and R2- And the pattern L2-BOX is paired with the R2-BOX so that the pattern L1-BOX is scrolled at the same speed in the downward direction, and the pattern L1-BOX of the left- -Box by forming an overactive control region OD (S201).

Next, the gray levels of the patterns L1-BOX, L2-BOX, R1-BOX and R2-BOX are set to G2, and the over driving area OD and the gray level of the background screen are set to G1 (S202).

Next, the brightness of the OD is adjusted so that the brightness of the hyper-driving region OD coincides with the brightness of the background screen G1 (S203).

Then, the brightness of the adjusted overdrive control area OD is compared with the brightness of the background screen. If they are the same, the overdrive value (OD _{G2) at the} time of switching the gray level of the OD at this time from the gray level G2 to G1 _{- > G1} ), and stores the overdrive value (OD _{G2 - > G1} ) in the memory. If it is different, the process returns to step S203 and repeats the operation (S204).

The above-mentioned three-dimensional second lookup table extraction method S201 to S204 is a process for performing the above process without using a shutter glass. Particularly, a device capable of measuring brightness can be used in a part for comparing brightness, It is preferable to proceed with the above process using his or her own eyes.

(Correction value) at the time of converting the gray level from G2 to G1 in the moving three-dimensional image through the extraction process of the three-dimensional second lookup table, and extracting the gray level The three-dimensional second lookup table shown as an example in Fig. 11 can be extracted.

 The three-dimensional second lookup table shown in FIG. 11 is applied to the first frame in which the gray level is switched when the three-dimensional image is driven. Referring to FIG. 11, if the image of the previous frame has 32 gray levels and the target luminance value of the image of the current frame is 64 gray levels, the over driving value should be corrected to 107 gray levels. 107, the present frame becomes able to display the luminance value of 64 gray levels, that is, the target luminance value.

Further, it is also possible to set the pattern, the hyper-driving control area, and the background screen of the left and right image frames through the program in which the first and second lookup table extraction methods are executed and the recording medium on which the method is recorded, And the correction values of the three-dimensional first and second lookup tables can be extracted.

Hereinafter, a three-dimensional liquid crystal display device according to an embodiment of the present invention will be described. The three-dimensional liquid crystal display device according to the embodiment of the present invention can perform the over-driving modulation method for minimizing the crosstalk and the motion blur.

FIG. 12 shows a configuration of a three-dimensional liquid crystal display device according to an embodiment of the present invention. 12, the liquid crystal display device according to the embodiment of the present invention may include a frame memory 310, an over-driving control unit 320, and an image output unit 330.

When a three-dimensional image signal is input, the image signal is stored in the frame memory 310 on a frame-by-frame basis.

The overdrive control unit 320 stores the three-dimensional first lookup table and the three-dimensional second lookup table. According to the correlation between the image signal stored in the frame memory 310 and the currently input image signal, The three-dimensional first lookup table, and the three-dimensional second lookup table.

The image output unit 330 receives a video signal from the over-driving control unit 320 and outputs a three-dimensional image.

In the above-described embodiment of the present invention, the liquid crystal panel is driven by the black data insertion (BFI: Black Frame Insertion) driving method in the shutter glass type three-dimensional image display system. And the present invention are not limited thereto, and may be applied to a three-dimensional image display system different from the above embodiment.

While the present invention has been described with reference to the preferred embodiments described above and the accompanying drawings, it is to be understood that the invention may be embodied in different forms without departing from the spirit or scope of the invention. Therefore, the scope of the present invention is defined by the appended claims, and should be construed as not limited to the specific embodiments described herein.

Also, in this specification, singular forms include plural forms unless specifically stated in the text. &Quot; comprises "and / or" comprising "used in the specification do not exclude the presence or addition of components other than the components mentioned. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs.

Claims (9)

A driving method of a liquid crystal display device for displaying a three-dimensional image,
The video signal is input in the order of the left eye frame, the black frame, the right eye frame, and the black frame (LBRB)
For a still image, an overdrive is performed using a three-dimensional first lookup table storing an over-driving value that reduces cross talk,
An overdrive modulation method for minimizing crosstalk and motion blur in a three-dimensional image display device, wherein the moving image is overdriven using a three-dimensional second lookup table in which an overdrive value for reducing motion blur is stored. The method of claim 1,
Wherein the three-dimensional first lookup table comprises:
When the video signal of the previous frame of the left eye and the video signal of the current frame of the left eye are the same and the video signal of the frame of the previous frame of the right eye and the video signal of the current frame of the right eye are the same and the right eye image signal and the left eye image signal are different, When switching to a frame and switching from the left eye current frame to the right eye current frame,
If the video signal of the previous frame of the left eye differs from the video signal of the current frame of the left eye and the video signal of the previous frame of the right eye differs from the video signal of the current frame of the right eye and the left eye image signal differs, When switching to a frame and switching from the left eye current frame to the right eye current frame,
When the video signal of the previous frame of the left eye and the video signal of the current frame of the left eye are different and the video signal of the previous frame of the right eye and the video signal of the current frame of the right eye are the same and the left eye image signal and the right eye image signal are different, When switching to a frame and switching from the left eye current frame to the right eye current frame,
If the video signal of the previous frame of the left eye and the video signal of the current frame of the left eye are the same and the video signal of the frame of the previous frame of the right eye differs from that of the frame of the current eye of the right eye, When switching to the current frame,
Wherein the three-dimensional second look-
If the video signal of the previous frame of the left eye differs from the video signal of the current frame of the left eye and the video signal of the frame of the current frame of the right eye differs from that of the frame of the current eye of the right eye, , It can be used for over driving,
If the video signal of the previous frame of the left eye differs from the video signal of the current frame of the left eye and the video signal of the frame of the current frame of the right eye is the same as that of the frame of the current frame of the right eye, To the previous frame in the right eye,
When the video signals of the left frame previous frame, the left frame current frame, the right previous frame, and the right current frame are all the same, the video signal of the current frame is outputted as it is. Overdrive modulation method for minimization. The method of claim 1,
Wherein the overriding value of the three-dimensional first look-
BOX and R-BOX having the same size, shape, and position are formed in each of the left eye image frame and the right eye image frame, and a size, a shape, and a position of each of the pattern L-BOX and the pattern R- The same overdrive control areas OD1 and OD2 are set and displayed,
The brightness of the hyper-driving region OD1 or OD2 is adjusted by comparing the brightness of the over-driving region OD1 or OD2 with the brightness of the pattern L-BOX, R-BOX, or background image. An overdriving method for minimizing motion blur. The method of claim 3,
The over-driving value of the first look-
The pattern L-BOX is displayed on the left eye image, the pattern R-BOX is displayed on the right eye image, and the hyperdrive control areas OD1 and OD2 having the same size, shape and position on the inner side of the pattern L- Respectively, and displaying them;
A second step of setting the hyper-driving area OD1 and the gray level of the background screen to G1, and setting the gray level of the pattern L-BOX and R-BOX and the gray level of the hyper-driving area OD2 to G2;
A third step of shutting off the right eye of the shutter glasses and adjusting the brightness of the OD1 so that the brightness of the over driving area OD1 becomes equal to the brightness of the background screen;
(OD _G2-> OD2) when the gray level of the area OD1 at this time is switched from the gray level G2 to the G1 when the brightness of the over driving area OD1 is equal to the brightness of the background screen, _G1 );
A fifth step of shutting off the left eye of the shutter glasses and adjusting the brightness of OD2 such that the brightness of the hyper-driving area OD2 becomes equal to the brightness of the pattern R-BOX;
The brightness of the overdrive adjustment region OD2 is compared with the brightness of the pattern R-BOX. If they are the same, the second overdrive value OD _{G1 at the} time of switching the gray level of the OD2 at this time from the gray level G1 to G2 _{- > G2} );
(OD _{G2 - > G1} ) and a second over driving value (OD _{G1 - > G1} ) when the brightness of the over driving area OD1 is equal to the brightness of the background screen by intercepting the right eye of the shutter glasses. _{-> G2)} stored in the memory, different from the case the gray level of the area OD1 in the first donggap overdrive (OD _{G2-> G1),} the gray level of the region OD2 second donggap overdrive (OD _{G1 -> G2} ), And repeating the sixth step in the third step;
The method of claim 1, wherein the crosstalk and motion blur are minimized in a three-dimensional image display apparatus. The method of claim 1,
Wherein the overriding value of the three-dimensional second look-
BOX, R1-BOX, and R2-BOX, which are the same in size and shape, are displayed on the left eye image frame and the right eye image frame so as to scroll at the same speed in either direction, And the pattern L2-BOX is paired with the R2-BOX so as to scroll along the same locus,
An overdrive adjustment region OD is set and displayed on one side of the four patterns in the opposite direction of the scroll,
And the brightness of the OD is adjusted by comparing the brightness of the overdrive adjustment region OD with the brightness of the background screen. The overdrive modulation for minimizing crosstalk and motion blur in the three- Way. 6. The method of claim 5,
And the length of the hyper-driving area OD parallel to the scroll direction is set to be proportional to the scroll speed. 6. The method of claim 5,
Wherein the four patterns are displayed so as to scroll downward, and the over-driving region OD is set on the upper portion of the L1-BOX to display the four patterns, thereby minimizing crosstalk and motion blur in the three- Overdrive modulation method. 8. The method of claim 7,
The over-driving value of the second look-
BOX and R2-BOX on the left eye image and the overdrive control area OD on the upper part of the pattern L1-BOX, the patterns R1-BOX and R2-BOX are displayed on the right eye image, , L2-BOX, R1-BOX, R2-BOX and the hyper-control region OD are scrolled downward at the same rate;
Setting a gray level of the patterns L1-BOX, L2-BOX, R1-BOX, and R2-BOX to G2, setting the overdrive adjustment region OD and the gray level of the background screen to G1;
A third step of adjusting the brightness of the hyper-driving area OD to match the brightness of the background screen G1;
The brightness of the adjusted overdrive control region OD is compared with the brightness of the background screen. If the brightness of the overdrive control region OD is equal to the brightness of the background screen, the overdrive value at the time of switching the gray level of the overdrive control region OD from G1 to G1 OD _{G2 - > G1} ) and stores the overdriving value (OD _{G2 - > G1} ) in a memory, and if it is different, returns to the third step and repeats the fourth step;
The method of claim 1, wherein the crosstalk and motion blur are minimized in a three-dimensional image display apparatus. A three-dimensional liquid crystal display device which executes the driving method of the liquid crystal display device according to claim 1,
A frame memory for storing the input three-dimensional image signal in units of frames;
Dimensional lookup table and the three-dimensional second lookup table, wherein the three-dimensional first lookup table and the three-dimensional second lookup table are stored in correspondence with the correlation between the video signal stored in the frame memory and the currently input video signal, An over-driving control unit for over-driving and outputting a video signal with reference to any one of the second look-up tables;
An image output unit for receiving a video signal from the overriding control unit and outputting a three-dimensional image;
And an overdrive modulator for minimizing crosstalk and motion blur in the three-dimensional image display apparatus.

Images