KR102055134B1 - Three Dimensional Image Display Device And Method Of Driving The Same - Google Patents

Abstract

The present invention, the detection unit for detecting the point where the viewer is located; A control unit for calculating an expected point by adding a distance to which the viewer moves during the delay time; A barrier panel having a barrier located at a barrier expected point corresponding to the expected point and a slit disposed alternately with the barrier; Provided is a 3D image display device including a display panel for transmitting a left eye image and a right eye image to the viewer through the barrier panel.

Description

3D image display device and driving method thereof {Three Dimensional Image Display Device And Method Of Driving The Same}

The present invention relates to a three-dimensional image display device, and more particularly, to a three-dimensional image display device and a driving method thereof in which the display quality of the three-dimensional image is improved by setting the barrier position in consideration of the movement of the viewer according to the delay time. .

The technology of realizing 3D image that allows you to feel 3D depth and 3D feeling from 2D image is widely used in direct related fields such as display, home appliances, communication industry, aerospace, art industry and automobile business field. The technical ripple effect is expected to be higher than the current high definition television (HDTV).

The most important factor for human sense of depth and three-dimensionality is binocular disparity due to the gap between the two eyes, but in addition, there is a deep relationship between psychological and memory factors. Based on whether a 3D image can be provided to a user, it is generally classified into a volumetric (volumetric type), a three-dimensional (holographic type), and a stereoscopic type (stereoscopic type).

Among them, the stereoscopic expression method is a method of making a stereoscopic feeling by using physiological factors of both eyes, specifically, a plane of parallax information included in the left and right eyes of a human being about 65 mm apart. When the associated image is seen, the brain generates spatial information before and after the display surface in the process of fusing them, and uses stereography (stereoography).

This stereoscopic expression method is called a multi-eye display method, and the spectacle method using the special glasses on the observer's side or the parallax barrier, lenticular or integral on the display side depending on the actual stereoscopic generation position. It can be divided into an autostereoscopic method using a lens array of the back.

Recently, a barrier panel which is formed of two electrodes facing a parallax barrier or a lens array and a liquid crystal layer interposed therebetween so as to change the position and size of the slit and barrier by voltage applied to the two electrodes. This technology is being developed, and a technology for changing the position of the slit and barrier of the barrier panel by tracking the viewer's eyes has been proposed.

1A and 1B are diagrams for explaining an eye tracking operation of a conventional eye tracking type 3D image display device, and show luminance and crosstalk according to a viewing angle at a point where a stationary viewer is located, respectively. .

As shown in FIGS. 1A and 1B, when the stationary viewer is located at the first to third points P1, P2, and P3, the eye-tracking type three-dimensional image display apparatus may be used as a viewer. By detecting the position of the and changing the position of the slit and the barrier of the barrier panel (not shown) according to the detected position, the image of the display panel (not shown) is the first to third points (P1, P2, P3) Make sure it is delivered to your viewers.

Specifically, when the stationary viewer is located at the first point P1, the gaze tracking type 3D image display device allows the barrier of the barrier panel to be located at the first barrier point B1, thereby providing the first highest value. The image having the luminance L1 and the lowest first crosstalk C1 is transmitted to the viewer.

Similarly, when the stationary viewer is located at the second point P2, the gaze tracking three-dimensional image display device causes the barrier of the barrier panel to be located at the second barrier point B2, thereby providing the second luminance with the highest value. When the image having L2 and the lowest second crosstalk C2 is transmitted to the viewer, and the stationary viewer is located at the third point P3, the gaze tracking three-dimensional image display device is a barrier panel. By positioning the barrier at the third barrier point B3, an image having the highest value of the third luminance L3 and the lowest value of the third crosstalk C3 is transmitted to the viewer.

As such, when the stationary viewer is located at the first to third points P1, P2, and P3, the gaze tracking type 3D image display device may be configured according to the first to third points P1, P2, and P3. By changing the position of the barrier of the barrier panel, the viewer can watch an image of optimum quality with high luminance and low crosstalk.

However, when the viewer is moving, a difference occurs between the viewer's real time position and the changed position of the barrier, which will be described with reference to the drawings.

FIG. 2A and FIG. 2B are diagrams for explaining an eye tracking operation of a conventional eye tracking type 3D image display device. FIG. 2A and FIG. 2B show luminance and crosstalk according to a viewing angle at a position where a viewer in a moving state is located. .

As shown in FIGS. 2A and 2B, when the viewer starts from the first point P1 and passes through the second point P2 to arrive at the third point P3, the gaze tracking type 3D image display device may include: The position of the viewer is sensed, and the position of the slit and barrier of the barrier panel (not shown) is changed according to the detected position, and the position detection and the barrier change take a certain time.

Specifically, when the viewer is located at the first point P1, the gaze tracking type 3D image display device allows the barrier of the barrier panel to be positioned at the first barrier point B1 so that the first luminance L1 of the highest value is obtained. And an image having the lowest first crosstalk C1 to the viewer.

Then, when the viewer moves from the first point (P1) to the second point (P2), the gaze tracking three-dimensional image display device detects the second point (P2) as a new location of the viewer, the detected second point The second barrier point B2 corresponding to P2 is calculated, and the barrier panel is driven so that the barrier of the barrier panel is located at the second barrier point B2.

However, since the position detection of the viewer is performed periodically, the detection of the new position of the viewer takes one or more cycles of detection time.

In addition, a predetermined calculation time is required to calculate the new position of the barrier corresponding to the new position of the viewer, and a predetermined response time is also required to drive the barrier panel composed of the two electrodes and the liquid crystal layer.

That is, after the viewer detects the position, calculates the position of the barrier, and delays for driving the barrier panel, the barrier of the barrier panel is positioned at the second barrier point B2.

However, during the delay time, the viewer continuously moves and is positioned at the second moving point P2 ', so that the second point P2 detected by the eye tracking type 3D image display device and the second moving point where the actual viewer is located are located. A position difference ΔP occurs between the points P2 '.

Then, the second luminance L2 felt by the viewer located at the second point P2 and the second moving luminance L2 'felt by the viewer located at the second crosstalk C2 and the second moving point P2'. ) And the second mobile crosstalk C2 'generate a luminance difference ΔL and a crosstalk difference ΔC.

That is, the viewer located at the second moving point P2 'has the second moving luminance L2' lower than the second luminance L2 of the highest value of the barrier located at the second barrier point B2 and the lowest value. An image having a second mobile crosstalk C2 'higher than the second crosstalk C2 is viewed, so that the display quality of the image displayed by the eye-tracking three-dimensional image display device is degraded.

As described above, when the gaze tracking 3D image display device displays a 3D image by tracking the position of the viewer in a moving state, calculating the changed position of the barrier according to the time for detecting the position of the viewer and the detected position. After the delay time such as the time for driving, the time for driving the barrier panel composed of the liquid crystal layer and the electrode, the barrier of the barrier panel has a changed position, and during this delay, the viewer moves back to the new position. As a result, defects such as flicker and crosstalk may occur, resulting in a decrease in display quality of the 3D image.

The present invention has been proposed to solve this problem, and by changing the position of the barrier in consideration of the moving distance of the viewer corresponding to the delay time, defects such as flicker and crosstalk are prevented and the display quality of the 3D image is improved. An object of the present invention is to provide an improved three-dimensional image display device.

In order to solve the above problems, the present invention, the detection unit for detecting the location of the viewer; A control unit for calculating an expected point by adding a distance to which the viewer moves during the delay time; A barrier panel having a barrier located at a barrier expected point corresponding to the expected point and a slit disposed alternately with the barrier; Provided is a 3D image display device including a display panel for transmitting a left eye image and a right eye image to the viewer through the barrier panel.

The delay time may include a time for the sensing unit to detect the point of the viewer, a time for the controller to calculate the barrier predicted point, and a time for driving the barrier panel.

The controller may calculate a moving speed of the viewer by calculating a moving speed of the viewer and multiplying the moving speed by the delay time according to a delay factor.

The delay element may include a sensing period, a change distance of the barrier, and a response speed of the barrier panel, and the controller may store the delay time according to the delay element as a lookup table.

In addition, the barrier panel may include: first and second substrates spaced apart from each other; A plurality of first electrodes formed on an inner surface of the first substrate; A second electrode formed on an inner surface of the second substrate; It may include a liquid crystal layer formed between the plurality of first electrodes and the second electrode.

The 3D image display device generates first and second voltages corresponding to the positions of the slits and the barriers and supplies them to the plurality of first electrodes, and generates a common voltage to supply the second electrodes. A barrier driving unit; A display driver for generating data signals corresponding to the left eye image and the right eye image by using image data and supplying the data signals to the display panel; The apparatus may further include a generator configured to combine the left eye image data and the right eye image data to generate the image data.

On the other hand, the present invention comprises the steps of sensing the location where the viewer is located; Calculating an expected point of the viewer by adding a distance that the viewer moves during the delay time to the point; Driving a barrier panel such that the barrier is located at a barrier expected point corresponding to the expected point; A method of driving a 3D image display device comprising transmitting a left eye image and a right eye image to the viewer through the barrier panel.

The delay time may include a time for detecting the point of the viewer, a time for calculating the barrier predicted point, and a time for driving the barrier panel.

The calculating of the expected point may further include calculating a moving speed of the viewer from the point; And calculating a distance that the viewer moves during the delay time by multiplying the movement speed by the delay time according to a delay factor.

According to the present invention, by changing the position of the barrier in consideration of the moving distance of the viewer corresponding to the delay time, defects such as flicker and crosstalk are prevented and the display quality of the 3D image is improved.

1A and 1B are views for explaining an eye tracking operation of a viewer in a stationary state of a conventional eye tracking type 3D image display device.
2A and 2B are diagrams for explaining a gaze tracking operation of a viewer in a moving state of a conventional gaze tracking type 3D image display device.
3 is a diagram illustrating a gaze tracking type 3D image display device according to an exemplary embodiment of the present invention.
4 is a view for explaining a method of driving a gaze tracking type 3D image display device according to an exemplary embodiment of the present invention.
5A and 5B are views for explaining an eye tracking operation of a viewer in a moving state of the eye tracking type 3D image display device of the present invention.

Hereinafter, an eye-tracking type 3D image display apparatus according to the present invention will be described with reference to the accompanying drawings.

3 is a diagram illustrating a gaze tracking type 3D image display device according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the eye tracking 3D image display apparatus 110 according to an exemplary embodiment of the present invention may include a display panel 120, a barrier panel 130, a display driver 140, and a barrier driver 142. ), A detector 150, a controller 160, and a generator 170.

The display panel 120 displays a left eye image and a right eye image using a plurality of pixels, and includes, for example, a liquid crystal display (LCD), an organic light emitting diode (OLED), and the like. The same may be a flat panel display (FPD).

The barrier panel 130 separates the left eye image and the right eye image emitted from the display panel 120 using slits (not shown) and barriers (not shown) which are alternately arranged to transmit and block light, respectively. The position of the slit and barrier can be changed according to the position of.

For example, the slits and barriers may be alternately arranged in the form of vertical stripes.

Although not shown, the barrier panel 130 may include a plurality of first and second substrates facing each other, a plurality of first electrodes formed on an inner surface of the first substrate, a second electrode formed on an inner surface of the second substrate, and a plurality of substrates. It may include a liquid crystal layer formed between the first electrode and the second electrode of.

The display driver 140 generates a plurality of data signals by using one frame of image data, supplies the plurality of data signals to the pixels of the display panel 120, and generates a plurality of gate signals to generate the plurality of gate signals. Can be supplied to the pixel.

The barrier driver 142 generates first and second voltages corresponding to the positions of the slit and barrier of the barrier panel 130 and supplies them to the plurality of first electrodes of the barrier panel 130 according to the viewer's position information. The common voltage VCOM is generated and supplied to the second electrode of the barrier panel 130.

The detection unit 150 grasps information on a position at which the image of the display panel 120 should reach, such as the left and right eyes of the viewer, for example, a charge-coupled device (CCD) camera and a thermal sensor. It may include at least one of the radar.

The controller 160 controls the barrier driver 142 so that the positions of the slit and barrier of the barrier panel 130 are changed according to the viewer's position information received from the detector 150, and the left eye image data 172 and The generation unit 170 is controlled to generate the image data of one frame by combining the right eye image data 174.

Herein, the controller 160 adds a distance moved by the viewer during a delay time such as a time for detecting the viewer's position, a time for calculating the changed position of the barrier, and a time for driving the barrier panel, to the detected position of the viewer. To calculate the changed position of the viewer.

The generation unit 170 generates the image data of one frame by combining the left eye image data 172 and the right eye image data 174, and supplies the generated image data to the display driver 140.

In the eye tracking 3D image display apparatus 110, the detector 150 detects the viewer's location information, and the controller 160 adds the distance traveled by the viewer during the delay time to the viewer's detected location information. Calculate the changed position information of the viewer, and the barrier driver 142 generates the first and second voltages respectively applied to the first and second electrodes according to the changed position information of the viewer, and supplies them to the barrier panel 130. , The position of the slit and barrier of the barrier panel 130 is changed due to the moving distance of the viewer during the delay time, and as a result, the flicker and crosstalk of the 3D image displayed by the eye tracking 3D image display device 110 are displayed. Such defects are prevented and the display quality is improved.

A method of changing the position of the slit and the barrier of the eye tracking 3D image display apparatus 110 will be described with reference to the drawings.

4 is a view for explaining a method of driving a gaze tracking type 3D image display device according to an exemplary embodiment of the present invention, which will be described with reference to FIG. 3.

As shown in FIG. 4, when the viewer in a moving state moves from the first point P1 to the third point P3 through the second point P2, the gaze tracking type 3D image display device 110 The controller detects the viewer's position, calculates the viewer's expected position by adding the distance traveled by the viewer during the delay time to the detected position, and drives the barrier panel 130 to correspond to the expected position.

Specifically, the sensing unit 150 detects the first point P1 where the viewer in the moving state is located, and the controller 160 detects the time of the viewer's position, time for calculating the position of the barrier, and barrier panel 130. The first predicted point P1 'of the viewer is calculated from the distance to which the viewer moves during a delay time such as a time for driving), and the barrier driver 142 determines that the barrier corresponds to the first predicted point P1'. The barrier panel 130 is driven to be located at the one barrier expected point B1 '(st10).

Accordingly, the viewer may view the left eye image and the right eye image of the display panel 120 through the barrier panel 130 having the barrier of the first barrier predicted point B1 'at the first predicted point P1'.

In addition, the detector 150 detects the second point P2 where the viewer in the moving state is located, and the controller 160 detects the time of the viewer's position, time for calculating the position of the barrier, and barrier panel 130. The second predicted point P2 'of the viewer is calculated from the distance that the viewer moves during a delay time such as a time for driving the second, and the barrier driving unit 142 determines that the barrier corresponds to the second predicted point P2'. The barrier panel 130 is driven to be located at the barrier expected point B2 '(st20).

Accordingly, the viewer may view the left eye image and the right eye image of the display panel 120 through the barrier panel 130 having the barrier of the second barrier predicted point B2 'at the second predicted point P2'.

In addition, the detector 150 detects the third point P3 where the viewer in the moving state is located, and the controller 160 detects the viewer's position, time for calculating the position of the barrier, and barrier panel 130. The third predicted point P3 'of the viewer is calculated from the distance that the viewer moves during a delay time such as a time for driving of the target, and the barrier driving unit 142 determines that the barrier corresponds to the third predicted point P3'. The barrier panel 130 is driven to be located at the barrier anticipated point B3 '(st30).

Accordingly, the viewer may view the left eye image and the right eye image of the display panel 120 through the barrier panel 130 having the barrier of the third barrier predicted point B3 'at the third predicted point P3'.

Here, the controller 160 calculates the moving speed of the viewer by dividing the distance between the two positions of the viewer by the time the viewer moves between the two positions, and delays the detection period, the change distance of the barrier, the liquid crystal response speed, and the like. The distance traveled by the viewer during the delay time can be calculated by multiplying the calculated movement speed by the delay time according to the factor.

In this case, the controller 160 may store the delay time according to the delay element in the form of a look-up table.

As such, the gaze tracking type 3D image display apparatus 110 according to an exemplary embodiment of the present invention calculates an expected position of a viewer in a moving state during a delay time and determines the position of the barrier so as to correspond to the luminance and luminance. A three-dimensional image with improved crosstalk can be displayed, and the principle of such display quality improvement will be described with reference to the drawings.

5A and 5B are diagrams for explaining an eye tracking operation of an eye tracking type 3D image display device according to the present invention. FIG. 5A and FIG. 5B show luminance and crosstalk according to a viewing angle at a position where a viewer in a moving state is located. Indicates.

As shown in FIGS. 5A and 5B, when the viewer starts from the first point P1 and passes through the second point P2 to arrive at the third point P3, the eye tracking 3D image display apparatus ( 110 detects the position of the viewer, and changes the position of the slit and barrier of the barrier panel 130 according to the detected position and the distance to move during the delay time.

In detail, when the viewer is located at the first point P1, the gaze tracking type 3D image display device 110 allows the barrier of the barrier panel 130 to be positioned at the first barrier point B1 to provide the highest value. The image having the first luminance L1 and the lowest first crosstalk C1 is transmitted to the viewer.

Subsequently, when the viewer moves from the first point P1 to the second point P2, the gaze tracking type 3D image display apparatus 110 detects the second point P2 as a new location of the viewer and detects the detected point. The second expected point (P2) by adding a distance to the viewer during the delay time, such as the time for the viewer's position detection, the time for calculating the position of the barrier, the time for driving the barrier panel 130, etc. P2 ') is calculated and the barrier panel 130 is driven so that the barrier of the barrier panel 130 is located at the second barrier predicted point B2' corresponding to the second predicted point P2 '.

Since the viewer continuously moves from the second point P2 for a delay time and is positioned at the second predicted point P2 ', the viewer may detect the second point P2 detected by the eye-tracking type 3D image display device 110. A position difference ΔP occurs between the second expected point P2 ′ where the actual viewer is located.

However, the viewer located at the second predicted point P2 'has a second predicted luminance L2' of the highest value of the barrier located at the second barrier predicted point B2 'and a second predicted crosstalk of the lowest value ( C2 '), the second expected luminance (L2') is the same as the second luminance (L2) of the highest value of the barrier located at the second barrier point (B2), the second expected cross The torque C2 'is the same level as the second crosstalk C2 of the lowest value of the barrier located at the second barrier point B2, and the second predicted luminance felt by the viewer located at the second expected point P2'. A luminance difference ΔL substantially between L2 'and the second expected crosstalk C2' and the second luminance L2 and the second crosstalk C2 felt by the viewer located at the second point P2. And crosstalk difference ΔC is eliminated. (ΔL ~ 0, ΔC ~ 0)

That is, the barrier of the barrier panel 130 corresponds to the second predicted point B2 'considering the moving distance during the delay time instead of the second barrier point B2 corresponding to the detected second point P2. By being located at the second barrier predicted point B2 ', luminance and crosstalk can be improved.

For example, when the delay time is about 50 ms, the viewer moving to about 20 cm / s moves about 1 cm further during the delay time, and the viewer is located about 30 cm in front of the gaze tracking type 3D image display device 110. You can feel the difference in the viewing angle of about 2 degrees.

In the eye tracking 3D image display apparatus 110, an estimated point is calculated by adding about 1 cm to the detected position, and the position of the barrier is changed to correspond to the expected point, thereby improving a 3D image having improved luminance and crosstalk. I can display it.

Thereafter, when the viewer is located at the third point P3, the gaze tracking type 3D image display device 110 causes the barrier of the barrier panel 130 to be positioned at the third barrier point B3 to display the first value. The image having the 3 luminance L3 and the lowest third crosstalk C3 is transmitted to the viewer.

In the above, the barrier panel 130 having the slit and the barrier has been described as an example, but the same applies to the lenticular panel having the lenticular array.

In addition, the moving barrier type for changing the position of the barrier according to the movement of the viewer has been described as an example, but the same applies to the image moving type for changing the position of the image according to the movement of the viewer. can do.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

110: 3D image display device 120: display panel
130: barrier panel 140: display driver
142: barrier driving unit 150: detection unit
160: control unit 170: generation unit

Claims (10)

A detector for detecting a measurement point at which the viewer is located;
A controller configured to calculate an expected point by adding a moving expected distance to which the viewer will move during the delay time to the measurement point;
A barrier panel having a barrier that is different from the barrier point corresponding to the measurement point and positioned at a barrier predicted point corresponding to the expected point, and a slit alternately with the barrier;
A display panel for delivering a left eye image and a right eye image to the viewer through the barrier panel.
Including,
The controller calculates the movement expected distance by multiplying the movement speed of the viewer by the delay time according to a delay element including a sensing period of the detection unit.
The luminance of the highest value of the barrier located at the barrier point is the same as the luminance of the maximum value of the barrier located at the barrier anticipated point,
And a crosstalk of the lowest value of the barrier located at the barrier point and a crosstalk of the lowest value of the barrier located at the barrier expected point.
The method of claim 1,
The delay time may include a time for the sensing unit to detect the measurement point of the viewer, a time for the control unit to calculate the barrier predicted point, and a time for driving the barrier panel.
The method of claim 2,
And the control unit calculates the moving speed of the viewer by dividing the distance between the two measurement points by the time when the viewer moves between the two measurement points.
The method of claim 3, wherein
The delay element further includes a change distance of the barrier and a response speed of the barrier panel.
The controller may be configured to store the delay time according to the delay element as a lookup table.
The method of claim 1,
The barrier panel,
First and second substrates facing each other;
A plurality of first electrodes formed on an inner surface of the first substrate;
A second electrode formed on an inner surface of the second substrate;
Liquid crystal layer formed between the plurality of first electrodes and the second electrode
3D image display device comprising a.
The method of claim 5, wherein
A barrier driver configured to generate first and second voltages corresponding to the positions of the slit and the barrier and supply the first and second voltages to the plurality of first electrodes, and generate a common voltage to supply the second electrodes;
A display driver for generating data signals corresponding to the left eye image and the right eye image by using image data and supplying the data signals to the display panel;
A generation unit generating the image data by combining the left eye image data and the right eye image data
3D image display device further comprising.
Detecting a measurement point at which the viewer is located;
Calculating an expected point of the viewer by adding a moving predicted distance to be moved by the viewer during the delay time to the measurement point;
Driving the barrier panel so that the barrier is located at a barrier prediction point different from the barrier point corresponding to the measurement point and corresponding to the expected point;
Delivering a left eye image and a right eye image to the viewer through the barrier panel;
Including,
The calculating of the expected point may include calculating the expected moving distance by multiplying the moving speed of the viewer by the delay time according to a delay element including a sensing period of a sensing unit.
The luminance of the highest value of the barrier located at the barrier point is the same as the luminance of the maximum value of the barrier located at the barrier anticipated point,
And a crosstalk of the lowest value of the barrier located at the barrier point and a crosstalk of the lowest value of the barrier located at the barrier expected point are equal to each other.
The method of claim 7, wherein
The delay time may include a time for sensing the measurement point of the viewer, a time for calculating the barrier predicted point, and a time for driving the barrier panel.
The method of claim 7, wherein
The calculating of the predicted point may further include calculating the moving speed of the viewer by dividing a distance between two measurement points by a time when the viewer moves between the two measurement points. Method of driving display device.
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