TWI475548B - Stereoscopic image display device and driving method for the same - Google Patents

Description

Stereoscopic image display device and driving method thereof

The present invention relates to a stereoscopic image display device, and more particularly to a stereoscopic image display device capable of minimizing flicker when a viewer changes position and a driving method thereof.

Currently, services for rapid dissemination of information are built on high-speed information communications, which have evolved from simple "listening and speaking" services such as current telephones to multimedia services based on digital viewing and listening. Among them, digital terminals are used for high-speed processing of characters, sounds and images. It is expected that these services will eventually develop into hyperspace three-dimensional information communication services, enabling virtual reality and stereoscopic viewing without time and space constraints.

Generally, a three-dimensional stereoscopic image is realized by the principle of stereo vision based on the eyes of the viewer. However, since the eyes of the viewer are spaced apart from each other by about 65 mm, that is, binocular parallax, the left and right eyes perceive slightly different images due to the difference in position between the eyes. This difference in image due to the positional difference between the two eyes is called binocular disparity.

The three-dimensional image display device is designed based on binocular disparity, allowing the left eye to only view the image for the left eye, and the right eye only viewing the image for the right eye, thereby assisting the viewer to realize the binocular aberration. 3D imagery. In particular, the left and right eyes respectively view different two-dimensional images. If two different images are transmitted to the brain through the retina, the brain accurately combines these images to reproduce the depth recognition and realism of the original 3D image. This ability is often referred to as stereoscopic imaging (stereoscopic imaging), and display devices using stereoscopic imaging are called stereoscopic displays. Device.

Meanwhile, the stereoscopic display device is classified into a glasses-type stereoscopic display device and a non-glasses-type stereoscopic display device according to methods and features for realizing three-dimensional images. The glasses-free stereoscopic display device is divided into a switchable panel type device and a lenticular lens type device according to the shape of the structure for realizing the three-dimensional image. In the switchable panel type device, a display panel for transmitting a two-dimensional image is provided on a three-dimensional panel for converting a two-dimensional image into a three-dimensional panel, thereby realizing a three-dimensional image. The lenticular lens type device realizes a three-dimensional image using a semi-cylindrical column piece joined to the display panel.

In the switchable panel type device, a switchable panel for converting a two-dimensional image into a three-dimensional image is provided on a display panel that emits a two-dimensional image to ensure realization of a three-dimensional image. The switchable panel type device is divided into a switchable barrier type device and a switchable liquid crystal lens type device.

In particular, in the case of a switchable barrier type device, a voltage is selectively applied to a plurality of electrodes of the switchable panel such that the liquid crystal layer is divided into a barrier region and a transmission region by alignment of liquid crystal molecules (transmitting region) Region). Because the function of the barrier area is to optically separate the left and right images, the viewer can see the 3D image.

The switchable barrier type stereoscopic image display device generally includes a display panel and a switchable panel, wherein the display panel emits a two-dimensional image, the switchable panel is formed on the display panel, and is transmitted according to the two-dimensional image received from the display panel. 3D imagery.

However, since the switchable barrier type stereoscopic image display device includes a barrier formed at a fixed position, if the position of the viewer is relatively tangible due to, for example, rotation of the device When the barrier-type stereoscopic image display device moves and deviates from the standard viewing position, the viewer cannot see the three-dimensional image.

Accordingly, the present invention provides a stereoscopic image display device and a method of driving the same that substantially obviate one or more of the problems caused by the limitations and disadvantages of the prior art.

It is an object of the present invention to provide a stereoscopic image display device and a method of driving the same in which a barrier region is moved by adjusting an aperture ratio of a transmissive region in a switchable region, thereby minimizing flicker perceived by a viewer who changes position.

Other advantages, objects, and features of the invention will be set forth in part in the description which follows, It is understood or can be derived from the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the <RTIgt;

In order to achieve the objects and other advantages of the present invention, the present invention will be embodied and broadly described. A stereoscopic image display device includes: a display panel for displaying images; and a switchable panel located on the display panel and having a plurality of switchable areas, the switchable panel is used to convert the image into a three-dimensional image; a voltage application unit is used to apply the voltage to the switchable panel, thereby dividing each switchable area into a barrier area and a transmissive area; and a control And a voltage application unit for controlling the position of the barrier region and the width of the barrier region in each switchable region.

The controller controls the voltage application unit to change the voltage applied to the switchable panel, Thus, in the case where the viewer changes position, the width of the barrier area within one switchable area is reduced.

Here, the ratio of the transmissive area to the one switchable area can be maximized to be in the range of 1% or less of the three-dimensional crosstalk.

In addition, the switchable panel includes a first substrate and a second substrate, a plurality of lower electrodes, and an upper electrode arranged in a direction opposite to each other, and the liquid crystal layer is disposed between the first substrate and the second substrate, and the lower electrodes are formed on the first substrate The upper electrode is formed on the entire surface of the second substrate.

In the case where the viewer has not changed the position for more than one critical time period, the ratio of the transmissive area to each switchable area is lowered. In this case, the ratio of the transmissive area to each switchable area is lowered such that the ratio is equal to the initial ratio before the viewer changes position.

According to another aspect of the present invention, a driving method including the above three-dimensional image display device includes: tracking a position of a viewer who views the stereoscopic image display device; and changing a width of the barrier region in the switchable region if the viewer changes the position; And if the viewer does not change position for more than one critical time period, the ratio of the transmissive area to each switchable area is reduced.

Here, the step of reducing the ratio of the transmissive area to each of the switchable areas is performed such that the ratio is equal to the initial ratio before the viewer changes position.

The barrier region of the switchable area has a first width when the viewer is stationary, and the second width when the viewer changes position, the second width being shorter than the first width.

In addition, the step of changing the width of the barrier region includes: detecting a first step of changing a position of the viewer; and changing a second step of the width of the barrier region to a second width; And shifting the barrier region to a third step corresponding to the change in position of the viewer.

The first step involves detecting by means of a user tracking method.

The second and third steps include adjusting the barrier region forming voltage and the transmissive region forming voltage to apply from the voltage application unit to the lower electrodes of each switchable region.

The second step includes increasing the amount of voltage applied to the transmissive regions of the lower electrodes to the left and to the right, such that the number of transmissive region forming voltages applied to the lower electrodes corresponds to a change in the barrier region from the first width to the second width.

Further, the third step includes shifting a barrier region having a second width in accordance with a movement of the viewer by adjusting a barrier region to be applied to the lower electrodes to form a voltage.

Moreover, the step of reducing the ratio of the transmissive area to each of the switchable areas further comprises detecting, by the user tracking method, that the viewer has not changed the position for more than one critical time.

It is to be understood that the foregoing general description of the invention and the claims

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

Hereinafter, a stereoscopic image display device of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a three-dimensional image display device of the present invention, and FIG. 2 is a schematic view showing a voltage application method of an electrode under the "first drawing".

As shown in FIG. 1 and FIG. 2, the stereoscopic image display device of the present invention includes a display panel 100 for displaying images, and is formed on the display panel 100. Switchable panel 200 on. The switchable panel 200 is configured to convert an image emitted by the display panel into a three-dimensional image, and is divided into a plurality of switchable regions. Each switchable area is divided into a barrier area B and a transmissive area T, and the barrier area B and the transmissive area T are alternately placed in the switchable panel 200. That is, in the switchable panel 200, there is one transmissive area between the two barrier areas, and one barrier area B exists between the two transmissive areas T. "FIG. 1" represents one of several switchable areas in the switchable panel 200, including two barrier areas and one transmission area separating the two barrier areas. However, as shown in "Fig. 5" and "Fig. 6B", one switchable area in the switchable panel may include two transmissive areas T and one barrier area B separating the two transmissive areas.

In the switchable panel 200, the same switchable area is repeated, so that the transmissive areas adjacent to the two switchable areas are continuous, and the two barrier areas adjacent to the two switchable areas are separated. Here, each switchable area has a width 'S'. In addition, how many switchable areas can be included in a switchable panel depends on the size of the stereoscopic image display device.

Each switchable region performs a switching function in accordance with whether or not an electrode formed therein is applied with a voltage. More specifically, the barrier region in each switchable region acts as a barrier to block light emitted from the display panel 100. When the barrier region is not formed, the switchable region functions as a single transmission region, directly emitting a two-dimensional image of the display panel 100 from below.

The switchable panel 200 includes a first substrate 200a and a second substrate 200b that are arranged to face each other with the liquid crystal layer 230 interposed therebetween. The switchable panel 200 further includes a plurality of lower electrodes 210 and one upper electrode 240, wherein the plurality of lower electrodes 210 are formed in the first

On a substrate 200a, an upper electrode 240 is formed on the entire surface of the second substrate 200b opposite to the first substrate 200a. In this case, as shown in "Fig. 1", the plurality of lower electrodes 210 are divided into two groups, and the two sets of lower electrodes are arranged on different layers with an insulating layer 220 interposed therebetween. A plurality of lower electrodes 210 may be precisely divided into a group and formed on a single layer as occasion demands.

The display panel 100 may be a flat display panel such as a liquid crystal display panel, an organic light emitting display panel, a plasma display panel, a field emission display panel, an electrophoretic display panel, and a quantum dot display panel. In the switchable panel 200 formed on the display panel 100, a plurality of lower electrodes 210 are connected to one voltage application unit 300 such that liquid crystal molecules of the liquid crystal layer 230 are selectively aligned according to the voltage received from the voltage application unit 300.

In particular, if a voltage is selectively applied to the plurality of lower electrodes 210, according to the alignment of the liquid crystal molecules of the liquid crystal layer 230, the liquid crystal layer 230 of one switchable region is changed into a barrier region and a transmissive region, and the switchable region is The width corresponds to a pitch. The liquid crystal molecules in the barrier region are aligned to block light guided from the backlight unit (not shown) through the display panel 100 to the switchable panel 200, and liquid crystal molecules in the transmissive region are aligned to transmit light.

More specifically, the barrier region and the transmissive region are not actual components of the liquid crystal layer 230 because the light guided by the backlight unit is blocked in accordance with the alignment of the liquid crystal molecules, which appears to form a barrier in the liquid crystal layer 230. Therefore, the switchable panel 200 ensures that the image transmitted by the display panel 100 is divided into a left image and a right image, thereby realizing a three-dimensional image using the switching function of the switchable panel. In this way, when the left eye only perceives the image for the left eye, and the right eye only perceives the image for the right eye point, the observer 3D images can be viewed.

If the viewer changes position, whereby the viewer's viewing angle deviates from the specific position, a portion of the two-dimensional image to be transmitted through the switchable panel is blocked by the barrier region, making it impossible to implement a three-dimensional image. Therefore, it is necessary to sense the movement of the viewer and change the position of the barrier area, thereby ensuring that the viewer can continuously view the three-dimensional image after changing the position to the final position and when changing the position.

Although not shown in the figure, in order to detect the movement of the viewer, a method such as user tracking is implemented. The user tracking system is a method of mounting a camera for the display panel 100 or the switchable panel 200 or a camera for a system including both the display panel 100 and the switchable panel 200, and perceives the movement of the pupil of the viewer's eyes or the viewer's head. The movement of the part to detect the final position of the viewer.

When the pupil movement is sensed, if the position of the viewer changes, the camera detects the center position of the left and right pupils, and senses a change in the center position. Alternatively, when sensing the movement of the face, if the viewer twists or moves his or her head, the camera perceives the movement of the head based on the difference between the face and the background color, thereby detecting the final position of the viewer.

Based on the detected change in position of the viewer, the controller 400 controls the voltage application unit 300 to supply a voltage to the plurality of lower electrodes 210 such that the voltage sequence applied to the lower electrode 210 in accordance with the voltage application unit 300 connected to the controller 400 is applied. , changing the position of the barrier area within each switchable area. That is, by perceiving the final position of the viewer who has changed the position, and changing the voltage sequence applied to the plurality of lower electrodes 210 according to the perspective of the viewer, the barrier area is moved to suit the viewing position of the viewer.

The "Fig. 3" shows an example of moving the barrier area in the stereoscopic image display device of "Fig. 1" in accordance with the change in the position of the viewer. The "figure 4" is a graph showing the relationship between the brightness and the angle of view when the position of the viewer shown in "Fig. 3" changes. As shown in "Fig. 3", when the viewer stops changing the position, "the width of the transmissive area in one switchable area having a pitch width is wider than the width of the barrier area" (hereinafter referred to as the aperture ratio) is fixed at About 37%. In the case where the user is perceived to change position, the barrier area moves in accordance with the changed position of the viewer in accordance with a method such as user tracking, thereby changing the viewing position. However, when the position of the viewer changes, for example, as shown in "Fig. 4", when the viewer moves in the direction of increasing viewing angle (i.e., when the viewer watching the center of the screen gradually reverses his head) The brightness gradually changes as the position of the viewer changes from the first position to the second position.

In general, the greater the change in brightness, the more visually perceived by the viewer is the change in brightness. This visual perception of brightness changes is known as moving flicker. In "Fig. 4", the thick solid line indicates the brightness perceived by the viewer under the observation condition in which the viewing angle is gradually increased. In particular, it is experimentally confirmed that the viewer perceives severe motion flicker at an intermediate position between the first position and the second position because of the intermediate position between the first position (first dashed line) and the second position (second dashed line) Has a great change in brightness.

Hereinafter, a driving method of the stereoscopic image display device of the present invention will be described with reference to "fifth drawing", "figure 6A", "figure 6B", "7A", "7B" and "8th".

When the user changes position, this method is used to adjust the width of the transmission area. To reduce motion flicker.

In the driving method of the stereoscopic image display device of the present invention, as shown in "Fig. 5", "Fig. 6A" and "Fig. 8", in the initial state in which the viewer is still (in step A), each switchable The width of the barrier region of the panel is expressed as a first width B1 (100S). In this case, the aperture ratio is about 37%, that is, T1/S is about 37%. Herein, the width of one switchable area is 'S', and the width 'T1' of the transmission area is 'S-B1'.

Next, the position of the viewer viewing the switchable panel is tracked, for example, by user tracking.

In this case, if it is actually detected that the viewer changes position, the width of the barrier area in each switchable area is changed by the second width B2 ("Step 5" and "Step 6B" step B) (120S). If it is actually detected that the viewer has not changed position, the width of the barrier area of each switchable area remains at the first width B1 (130S).

More specifically, if a viewer is actually detected to change position, the controller controls the voltage application unit to change the voltage sequence applied to the plurality of lower electrodes 210, thereby increasing the width of the transmissive region (from width T1 to width T2 and T2>T1). That is, the voltage to which the plurality of lower electrodes 210 provided in the switchable lens are applied is classified into a barrier region forming voltage and a transmissive region forming voltage. In this case, when it is desired to expand the transmission region, it is necessary to increase the number of formation voltages of the transmission region. Step B of "Fig. 5" indicates that the aperture ratio is increased to about 50%, that is, T2/S is 50%. Herein, the width 'T2' of the transmission area is 'S-B2'. The reason for increasing the aperture ratio as described above is as follows, and the degree of decrease in luminance depending on the visual change decreases as the aperture ratio increases.

Next, the viewer tracking method is used to detect whether the viewer viewing the switchable panel continuously changes its position (140S).

As shown in step C of "Fig. 5", if the viewer continuously changes the position (in step C), the barrier area remains with the lowered second width B2 (150S), and the switchable area is shifted according to the position change. That is to say, the aperture ratio is kept at about 50%, and the barrier area shown in "Fig. 5" is shifted to the right. In this case, the shift of the switchable region means the shift of the voltage applied to the lower electrode. Through this shift, in step B, the barrier region moves together with the transmissive region while maintaining the width T2 of the transmissive region. In this case, the shift of the voltage applied to the lower electrode shifts the barrier region having the second width B2 to correspond to the movement of the viewer. Step C can be omitted as the case requires.

Next, if the viewer stops changing the position (in step D), the width of the transmissive area is restored to the initial width (155S). In this case, in order to detect that the viewer stops changing position, user tracking is used to detect that the user has not changed position for more than one critical time period. For example, assume that the critical time period is one second, and if it is detected that the viewer has not changed position for more than one second, it is determined that the viewer has reached its final position.

In the stereoscopic image display device of the present invention, when the viewer changes position, the barrier region shifts and the aperture ratio increases (for example, from the width T1 to the width T2), if the viewer does not change the position for more than one critical time period, the viewer's The position is perceived as the final position and the aperture ratio is reduced (eg, from width T2 to width T1). In this case, the aperture ratio corresponding to the final position after the viewer ends the position change is equal to the aperture ratio (ie, the width T1) of the initial state before the user changes the position.

Here, when the viewer is at rest, the width of the barrier region in each switchable region is equal to the first width B1. When the viewer changes position, the width of the barrier region in each switchable region is equal to the second width B2, and the second width B2 is greater than the first width B1 short.

In other words, the driving method of the stereoscopic image display device of the present invention is characterized in that the width of the transmissive area is increased when the viewer changes position, thereby reducing a degree of brightness reduction according to a change in the viewing angle of view, thereby reducing motion flicker.

Therefore, in the stereoscopic image display device of the present invention, if the viewer actually detects the change of position, the controller affects the control, thereby increasing the aperture ratio with respect to the state in which the viewer is stationary, thereby ensuring that even when the position is changed, the viewer remains High quality 3D images can be viewed.

The "Fig. 6A" and "Fig. 6B" are diagrams showing changes in the widths of the barrier region and the transmissive region before and after the viewer changes position in the stereoscopic image display device of the present invention. In "6A" and "6B", the switchable area starting from 'R (right view)' and the switchable area starting from 'L (left view)' are marked together to fully indicate the transmissive area and the barrier area. .

As shown in "Fig. 6A", when the viewer is stationary, the transmissive area in the switchable area maintains the width T1. Then, when a change in position is detected, the transmissive area expands to the left and right to a width T2. That is, the expansion of the transmission area is achieved with respect to the width T1 of the transmission area before the position change is detected.

Here, the plurality of lower electrodes 210 are respectively connected to the voltage application unit 300, so that the voltages can be individually applied to the plurality of lower electrodes 210.

More specifically, the plurality of lower electrodes 210 in the switchable panel 200 are connected to the voltage application unit 300, wherein the voltage application unit 300 is connected to the controller 400. The controller 400 senses the positional change and final position of the viewer, and changes the voltage to be applied to the plurality of lower electrodes 210 to ensure that the viewer is in the final position and the changed position. Watch 3D images. In this case, the controller 400 controls the voltage application unit 300 to adjust the barrier region to be applied to the plurality of lower electrodes 210 to form a voltage and a transmissive region forming voltage, thereby ensuring that the aperture ratio when the viewer is stationary is different from when the viewer changes the position. The aperture ratio. During the change of position, the number of transmission region forming voltages applied in each switchable region is increased, and the amount of applied barrier region forming voltage is decreased. Further, at the final position after changing the position, in accordance with the shift of the switchable area, the application sequence in which the barrier region forming voltage and the transmissive region form a voltage is shifted from the initial applied order.

Figures 7A and 7B are graphs showing changes in the viewing angles of "Fig. 3" and "5th".

In this case, as shown in "Fig. 7A", a rapid drop in luminance occurs at the intersection of the transmission curve of the first position and the transmission curve of the second position. Therefore, an area where the brightness is rapidly lowered is perceived by the viewer as flicker, resulting in deterioration of display quality.

However, as shown in "Fig. 7B", the stereoscopic image display device of the present invention increases the aperture ratio when the viewer is detected to move. That is, when it is detected that the viewer changes position, the aperture ratio is increased, thereby reducing the brightness reduction degree by reducing the barrier area and increasing the transmission area according to the change in the angle of view.

During this period, the greater the ratio of the transmissive area to each switchable area, the more three-dimensional crosstalk. That is to say, three-dimensional crosstalk occurs when the left eye image is involved in the right eye and the right eye image is involved in the left eye. 50% of 3D crosstalk means that 50% of the left eye image is involved in the right eye. An increase in three-dimensional crosstalk may result in deterioration of image quality in the stereoscopic image display device. Therefore, when the viewer changes position, only the aperture ratio is maximized. It is preferable to add it in a range of 1% or less in three-dimensional crosstalk.

"Fig. 7B" shows the case where the aperture ratio is increased to 50%. It can be seen that the degree of brightness reduction between the previous position and the next position is lowered. Therefore, even if the viewer views the three-dimensional image while changing the position, the viewer can still view the high-quality three-dimensional image.

As described above, the stereoscopic image display device of the present invention is for increasing the aperture ratio, thereby ensuring that the viewer can reduce the viewing of the three-dimensional image with a minimized brightness while the viewer changes position. With this method, the degree of brightness reduction is reduced, thereby minimizing the motion flicker of the barrier and increasing the display quality.

During the above description, although the aperture ratio is described as approximately 37% when the positional change does not occur, and is 50% when the positional change occurs, the aperture ratio is not always limited thereto. The aperture ratio can be varied in accordance with the distance between the switchable panels, the electrode spacing provided in the switchable panel, and the number of electrodes.

As apparent from the above description, in the stereoscopic image display device and the driving method thereof of the present invention, if the viewer changes the position, the barrier area is changed by, for example, user tracking, in such a manner as to ensure that even when the viewer changes the position, the viewer can watch. To high quality 3D images. In addition, by increasing the aperture ratio of the transmissive area relative to the barrier area within a switchable area, the viewer is allowed to minimally perceive the change in brightness. Therefore, so-called motion flicker can be avoided.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

100‧‧‧ display panel

200‧‧‧Switchable panel

200a‧‧‧first substrate

200b‧‧‧second substrate

210‧‧‧ lower electrode

220‧‧‧Insulation

230‧‧‧Liquid layer

240‧‧‧Upper electrode

B‧‧‧Block area

T‧‧‧Transmission area

S‧‧‧Width

L‧‧‧left view

R‧‧‧Right view

300‧‧‧Voltage application unit

400‧‧‧ Controller

B1‧‧‧first width

B2‧‧‧ second width

T1, T2‧‧‧ width

1 is a cross-sectional view of a three-dimensional image display device of the present invention; FIG. 2 is a schematic view showing a voltage application method of the lower electrode shown in FIG. 1; and FIG. 3 is a first view; A schematic diagram of an example in which a moving barrier region is changed according to a position of a viewer in a stereoscopic image display device; and FIG. 4 is a graph showing a relationship between luminance and a viewing angle when a position of a viewer shown in FIG. 3 is changed; FIG. 5 is a schematic view showing an example of adjusting the width and position of the barrier region according to the position change when the viewer changes position in the stereoscopic image display device of the present invention; FIGS. 6A and 6B are diagrams showing the present invention. A schematic diagram of a change in width of a barrier region and a transmissive region before and after a viewer changes position in a stereoscopic image display device; FIGS. 7A and 7B are graphs showing brightness changes with viewing angles of FIGS. 3 and 5; 8 is a flow chart showing a driving method of the stereoscopic image display device of the present invention.

100‧‧‧ display panel

200‧‧‧Switchable panel

200a‧‧‧first substrate

200b‧‧‧second substrate

210‧‧‧ lower electrode

220‧‧‧Insulation

230‧‧‧Liquid layer

240‧‧‧Upper electrode

B‧‧‧Block area

T‧‧‧Transmission area

S‧‧‧Width

L‧‧‧left view

R‧‧‧Right view

Claims (15)

A stereoscopic image display device includes: a display panel for displaying an image; a switchable panel located on the display panel and having a plurality of switchable regions, wherein the switchable panel is configured to convert the image into a three-dimensional image; a voltage application unit for applying a voltage to the switchable panel to divide each switchable area into a barrier area and a transmissive area; and a controller for controlling the voltage application unit to adjust each switchable a location of the barrier region within the region and a width of the barrier region, wherein the controller controls the voltage application unit to change a voltage applied to the switchable panel to reduce the amount of each switchable region when the viewer changes position The width of the barrier area. The stereoscopic image display device of claim 1, wherein the ratio of the transmissive area to each of the switchable areas is maximized to be within a range of 1% or less of the three-dimensional crosstalk. The three-dimensional image display device of claim 1, wherein the switchable panel comprises a first substrate and a second substrate, a plurality of lower electrodes and an upper electrode arranged opposite each other, the first substrate and the first substrate A liquid crystal layer is disposed between the second substrates, and the lower electrodes are formed on the first substrate, and the upper electrodes are formed on the entire surface of the second substrate. The stereoscopic image display device of claim 1, wherein the viewer has more than one In the case where the critical time period has not changed position, the ratio of the transmissive area to each switchable area is lowered. The stereoscopic image display device of claim 4, wherein a ratio of the transmissive area to each switchable area is decreased such that the ratio is equal to an initial ratio before the viewer changes position. A method for driving a stereoscopic image display device, the stereoscopic image display device comprising a display panel, a switchable panel on the display panel having a plurality of switchable regions, and a voltage application unit for applying a voltage to the Switching the panel to divide each switchable area into a barrier area and a transmissive area, the driving method comprising: tracking the position of the viewer viewing the stereoscopic image display device; if the viewer changes the position, changing each switchable area The width of the barrier region; and if the viewer does not change position for more than one critical time period, the ratio of the transmissive region to each switchable region is reduced. The method of driving a stereoscopic image display device according to claim 6, wherein the step of reducing a ratio of the transmissive region to each of the switchable regions is performed such that the ratio is equal to an initial ratio before the viewer changes the position. The driving method of the stereoscopic image display device of claim 6, wherein the barrier region of each switchable region has a first width when the viewer is stationary, and has a second width if the viewer changes position. The second width ratio The first width is short. The driving method of the stereoscopic image display device of claim 8, wherein the step of changing the width of the barrier region comprises: detecting a first step of changing a position of the viewer; changing a width of the barrier region to the second a second step of width; and a third step of shifting the barrier region to correspond to a change in position of the viewer. The method for driving a stereoscopic image display device according to claim 9, wherein the first step comprises detecting by using a user tracking method. The driving method of the stereoscopic image display device of claim 9, wherein the switchable panel comprises a first substrate and a second substrate, a plurality of lower electrodes and an upper electrode, a liquid crystal layer, which are arranged opposite each other And being disposed between the first substrate and the second substrate, the lower electrodes are formed on the first substrate, and the upper electrode is formed on an entire surface of the second substrate. The method for driving a stereoscopic image display device according to claim 11, wherein the second step and the third step comprise adjusting a barrier region forming voltage and a transmissive region forming voltage to apply from the voltage application unit to each Switching the lower electrodes of the region. The method for driving a stereoscopic image display device according to claim 12, wherein the second step comprises adding a number of voltages applied to the transmissive regions of the lower electrodes to the left and right, so as to be applied to the The amount of voltage formed by the transmissive region of the electrode corresponds to the barrier region from the first width to the second width Change. The driving method of the stereoscopic image display device of claim 12, wherein the third step comprises: forming a voltage by adjusting the barrier region to be applied to the lower electrodes, and having a second width according to a movement shift of the viewer The barrier area. The method for driving a stereoscopic image display device according to claim 6, wherein the step of reducing the ratio of the transmissive region to each of the switchable regions further comprises detecting, by the user tracking method, that the viewer has more than one critical time. Change the location.