JP5436050B2 - 3D image display device - Google Patents

Description

  The present invention relates to a stereoscopic image display device for observing a stereoscopic image, and more specifically, a right-eye image and a left-eye image are sequentially displayed in a time division manner on a liquid crystal panel, and the image is displayed using a spectacle shutter. The present invention relates to a stereoscopic video display device that can suppress 3D crosstalk (mixed video for left eye / right eye) and luminance gradient on a monitor display screen when stereoscopically recognizing.

  FIG. 8 shows a configuration example of a stereoscopic video display device 50 using, for example, a glasses shutter system using liquid crystal.

  The stereoscopic video display device 50 includes a scan converter 51 that converts a stereoscopic video signal into a time-division video signal, a monitor 53 that displays video for left and right eyes in a time-division manner according to an input from the scan converter 51, a left eye unit, and a right eye. A light scattering type liquid crystal eyeglass shutter 57 that includes a light scattering type liquid crystal element 59 in each eye portion and controls transmission / non-transmission, and a liquid crystal shutter drive that drives the light scattering type liquid crystal eyeglass shutter 57 in synchronization with the operation timing of the monitor 53. And a circuit 55.

  In this apparatus, the stereoscopic video signal is converted into a time-division video signal by the scan converter 51, and then the left and right eye video is displayed on the monitor 53 in a time division manner. At this time, the liquid crystal shutter drive circuit 55 causes the liquid crystal element in the left eye to be in a transmissive state corresponding to the field where the left eye image is displayed on the monitor 53, for example, and the liquid crystal element in the right eye is shielded or blocked. It operates so as to be in a scattering state (see, for example, Patent Document 1).

JP 2000-275575 A

  However, in the conventional stereoscopic display device, a left-eye image that is not normally incident on the right eye of the observer, or a right-eye image that is not originally incident on the left eye is incident. 3D crosstalk sometimes occurred.

  Accordingly, an object of the present invention is to provide a stereoscopic video display device that can effectively prevent the occurrence of 3D crosstalk.

  It is another object of the present invention to provide a stereoscopic image display apparatus that can effectively prevent the occurrence of 3D crosstalk and that is less likely to cause a luminance gradient in the liquid crystal panel surface.

  In order to achieve the above-described object, a stereoscopic image display device according to the present invention includes a plurality of active matrix liquid crystal elements and includes n scanning lines extending in the row direction, and includes at least an upper region and a central portion. A liquid crystal panel that is divided into three areas, an area and a lower area, and that scans in the column direction from top to bottom in a time-division manner, a backlight that illuminates the liquid crystal panel, and a left eye And a liquid crystal shutter driving circuit for driving the liquid crystal panel and the eyeglass shutter in synchronization with each other, and each region of the liquid crystal panel includes a left eye image and a right eye eye portion. The corresponding backlight is turned on after a predetermined time has elapsed since any one is displayed, the backlight lighting period corresponding to the lower region, and the subsequent lighting. The lighting period of the partial area does not overlap, and the backlight corresponding to at least a part of the scanning lines of the lower area is caused to emit light earlier than the backlight corresponding to the immediately preceding scanning line, thereby reducing the lighting time ratio. The backlight lighting time ratio corresponding to the scanning lines of other portions is larger than the lighting time ratio.

  The stereoscopic image display device according to the present invention includes a plurality of active matrix liquid crystal elements and includes n scanning lines extending in the row direction, and includes at least an upper region, a central region, and a lower region. A liquid crystal panel that is divided into two regions and scans in the column direction from the top to the bottom to display the left and right eye images in a time-sharing manner, a backlight that illuminates the liquid crystal panel, and a left eye portion and a right eye portion A glasses shutter each having a liquid crystal element; and a liquid crystal shutter driving circuit for driving the liquid crystal panel and the glasses shutter in synchronization with each other, according to the liquid crystal response time of the glasses shutter when the glasses shutter is switched left and right The backlight is not turned on for a time interval.

  The stereoscopic image display device according to the present invention includes a plurality of active matrix liquid crystal elements and includes n scanning lines extending in the row direction, and includes at least an upper region, a central region, and a lower region. A liquid crystal panel that is divided into two regions and scans in the column direction from the top to the bottom to display the left and right eye images in a time-sharing manner, a backlight that illuminates the liquid crystal panel, and a left eye portion and a right eye portion A glasses shutter each having a liquid crystal element; and a liquid crystal shutter driving circuit for driving the liquid crystal panel and the glasses shutter in synchronization with each other, and the back corresponding to at least a part of the scanning line of the upper region in the liquid crystal panel The light emission amount is made larger than the light emission amount of the backlight corresponding to the scanning lines of other portions.

  Furthermore, the stereoscopic image display device of the present invention includes a plurality of scanning lines composed of a plurality of active matrix liquid crystal elements, and sequentially scans these scanning lines to display left and right eye images in a time-sharing manner. And a backlight for illuminating the liquid crystal panel, a spectacle shutter having a liquid crystal element in each of a left eye part and a right eye part, and a liquid crystal shutter driving circuit for driving the liquid crystal panel and the spectacle shutter in synchronization with each other. The active matrix liquid crystal element of the liquid crystal panel is composed of OCB liquid crystal, the liquid crystal element of the eyeglass shutter is composed of OCB liquid crystal, and the 3D crosstalk ratio in the front direction of the liquid crystal panel is 2% or less. It is characterized by.

  According to the present invention, it is possible to provide a stereoscopic video display device that can effectively prevent the occurrence of 3D crosstalk.

  In addition, according to the present invention, it is possible to provide a stereoscopic video display apparatus that can prevent the occurrence of 3D crosstalk and that hardly causes a luminance gradient in the liquid crystal panel surface.

It is the schematic which shows the structure of the three-dimensional video display apparatus concerning the 1st Embodiment of this invention. It is a figure which shows the three-dimensional video display method which concerns on the 1st Embodiment of this invention, (a) is a figure which shows the change with the time of the image | video displayed on a liquid crystal panel, (b) synchronized with (a). The figure which shows the timing of lighting of a backlight, (c) is a figure which shows the switching timing of a spectacle shutter, (d) is a graph which shows the responsiveness of the liquid crystal of liquid crystal panel upper part, (e) is the liquid crystal of the liquid crystal panel center part The graph which shows responsiveness, (f) is a graph which shows the responsiveness of the liquid crystal of a liquid crystal panel lower part. It is a graph which shows the response of a liquid crystal, and the light emission of a backlight, (a) is a graph which shows typically the change of the transmittance | permeability by the time of the general liquid crystal, (b) shows the timing of light emission of a backlight. Timing chart. It is a figure which shows the three-dimensional video display method which concerns on the 2nd Embodiment of this invention, (a) shows the change with the time of the image | video displayed on a liquid crystal panel, and the lighting timing of the backlight synchronized with this. FIG. 4B is a graph showing the response of the liquid crystal of the liquid crystal panel, FIG. 4C is a graph showing the response of the liquid crystal of the glasses shutter, and FIG. FIG. 9 is a reference diagram for explaining a stereoscopic video display method according to a third embodiment of the present invention, in which (a) shows a change in video displayed on a liquid crystal panel with time and a backlight synchronized with the change. The figure which shows the lighting timing of a part, (b) is a figure which shows the backlight light-emission quantity of a liquid crystal panel center part, (c) is a graph which shows the responsiveness of the liquid crystal of a liquid crystal panel center part, (d) is for right eyes The graph which shows the responsiveness of the liquid crystal of a spectacles shutter, (e) is a graph which shows the brightness | luminance of a liquid crystal panel center part, (f) is a figure which shows the switching timing of a spectacles shutter. FIG. 9 is a reference diagram for explaining a stereoscopic video display method according to a third embodiment of the present invention, in which (a) shows a change in video displayed on a liquid crystal panel with time and a backlight synchronized with the change. The figure which shows the timing of lighting of a part, (b) is a figure which shows the backlight light-emission amount of a liquid crystal panel upper part, (c) is a graph which shows the responsiveness of the liquid crystal of a liquid crystal panel upper part, (d) is a spectacle shutter for right eyes The graph which shows the responsiveness of the liquid crystal of this, (e) is a graph which shows the brightness | luminance of a liquid crystal panel upper part, (f) is a figure which shows the switching timing of a spectacles shutter. It is a figure which shows the three-dimensional video display method which concerns on the 3rd Embodiment of this invention, (a) is a change with the time of the image | video displayed on a liquid crystal panel, and lighting of a part of backlight synchronized with this. FIG. 5B is a timing chart, FIG. 5B is a graph showing the amount of backlight emitted from the upper part of the liquid crystal panel, FIG. 6C is a graph showing the response of the liquid crystal on the upper part of the liquid crystal panel, and FIG. (E) is a graph showing the luminance of the upper part of the liquid crystal panel, and (f) is a diagram showing the switching timing of the eyeglass shutter. Schematic which shows the structure of the conventional stereoscopic video display apparatus.

  Hereinafter, a stereoscopic video display device according to an embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows a configuration example of a stereoscopic video display apparatus 10 according to the first embodiment of the present invention.

  The stereoscopic video display device 10 includes a scan converter 1 that converts a stereoscopic video signal into a time-division video signal, a 15.4-inch diagonal liquid crystal panel 2 that displays video for the left and right eyes in a time-division manner, and a liquid crystal panel 2. A backlight 3 that illuminates the eye from behind, a spectacle shutter 7 having a light shutter liquid crystal element 9 in each of the left eye portion and the right eye portion, and a liquid crystal shutter drive circuit that drives the liquid crystal panel 2 and the spectacle shutter 7 in synchronization with each other And 5.

  The liquid crystal panel 2 has n = 800 scanning lines along the row direction, and each scanning line is composed of a plurality of active matrix liquid crystal elements.

  Each of the liquid crystal elements is sandwiched between a pixel electrode disposed via a thin film transistor connected to a gate electrode and a data electrode, and a counter electrode facing the pixel electrode. The scanning lines constituting the liquid crystal panel 2 are scanned line-sequentially in the column direction, and display images for the left and right eyes (and a black image if necessary) in a time-sharing manner.

  As a liquid crystal material used for the liquid crystal layer of the liquid crystal element and the optical shutter liquid crystal element 9, it is possible to use a liquid crystal having high-speed response characteristics, such as a ferroelectric liquid crystal, an antiferroelectric liquid crystal, an OCB (Optically Compensated Bend) liquid crystal, or the like. Desirably, it is preferable to use OCB liquid crystal especially considering high-speed response and viewing angle. In this embodiment, OCB liquid crystal is used as the liquid crystal material used for the liquid crystal layer of the liquid crystal element and the optical shutter liquid crystal element 9. Then, the liquid crystal panel 2 has a sum of rise and fall responses (response speed) of 3 ms which is 5 ms or less, and the optical shutter liquid crystal element 9 has a response speed of 5 ms or less, and further 2.5 ms which is 3 ms or less. It was.

  The backlight 3 can use a cold cathode tube, an LED, an organic EL, or the like as a light source, and is a direct type arranged directly on the back surface of the liquid crystal panel 2 or a side light type converted into a surface light source using a light guide plate. It can be.

  Note that when a black image is inserted between the left and right eye images, it is preferable to turn off the backlight in the area corresponding to the black image because the leakage light of the black image can be further prevented. In this case, for example, it can be realized by dividing the light guide plate into a large number in the scanning direction, or using a prism light guide plate, and sequentially controlling lighting / extinguishing of the corresponding LEDs according to scanning of the scanning lines.

  In the case of an organic EL, a light emitting line that can emit light in red, blue, and green corresponding to one or a plurality of scanning lines of a liquid crystal panel is extended in a row direction, and a large number of parallel lines are used in a planar shape. be able to.

  In this embodiment, a side light system using a prism light guide plate is adopted as the backlight 3, and the lighting / extinguishing of the LEDs can be controlled for each region corresponding to a plurality of adjacent scanning lines. That is, the backlight 3 is configured so that the 15-divided areas corresponding to the scanning lines can be individually controlled. By increasing the number of divisions, better display can be ensured. However, the effect can be obtained even with three or more divisions, and it is desirable that the division is performed so as to correspond to 200 or less scanning lines.

  In this stereoscopic video display device 10, the stereoscopic video signal is converted into a time-division video signal by the scan converter 1, and then the left and right eye video (and a black image if necessary) is displayed on the liquid crystal panel 2 in a time-division manner. . At this time, the liquid crystal shutter drive circuit 5 causes the optical shutter liquid crystal element 9 in the left eye portion to be in a transmissive state corresponding to the field in which the image for the left eye is displayed on the liquid crystal panel 2, for example. The shutter liquid crystal element 9 is operated so as to be in a light shielding state.

  Next, a stereoscopic video display method using the stereoscopic video display device 10 will be described with reference to FIG.

In FIG. 2A, the liquid crystal panel 2 displays the left-eye video, the black image, and the right-eye video sequentially in time division. Here, the liquid crystal panel 2 has a scan line consisting of n pieces extending in the horizontal direction (n = 800), the left-eye video in the first row of the scanning lines of the liquid crystal panel 2 is displayed at time T ₀ Then, the image for the left eye is sequentially displayed on the second line after Δt, the third line after 2Δt, and the 800th line after (n−1) Δt.

  In each scan line, after the left-eye video is displayed at regular intervals, a black image, a right-eye video, a black image, and a left-eye video are further displayed in this order. When displayed on the first line, display starts on the second line after Δt, the third line after 2Δt, and the 800th line after (n−1) Δt.

  Here, while the left eye image is being irradiated to the observer via the liquid crystal panel 2, the left eyeglass shutter is turned on, while the right eyeglass shutter is turned on, as shown in FIG. It is turned off. On the other hand, while the right-eye image is being irradiated to the observer, the right-eye spectacle shutter is turned on while the left-eye spectacle shutter is turned off.

In (b), when the left-eye image starts to be displayed in the first line of the scanning line at time T ₀ , the time required to reach a desired transmittance (transient response time) due to the properties of the liquid crystal is considered ( (Refer to FIG. 3) The backlight corresponding to the scanning line of the first row starts to be turned on after the delay time t has elapsed, and during t _BL until the left-eye video ends (before the start of black image writing). Is lit (see (d)).

Similarly, in the k-th scanning line corresponding to the central region (((n / 3) +1) to (2n / 3)) of the panel, the left eye after (k−1) Δt at time T _0. The backlight corresponding to the k-th scanning line starts to be turned on after the delay time t has elapsed, and the left-eye video is finished (before the start of black image writing). It is turned on between t _BL ((e) reference).

On the other hand, r (r ≧ ((2n / 3) +1), r <n),..., Each scanning line in the lower panel region (((2n / 3) +1) to n) , When the left-eye video starts to be displayed after (r−1) Δt of time T ₀ , the backlight corresponding to the scanning line of n = r,. After '<t) has elapsed, the LEDs start to be turned on all at once, and after t _BL' (t _{BL '} > t _BL ) has passed, the lights are turned off all at once.

This is because, as shown in (c), one for the left eye eyeglass shutter Ru switched from ON to OFF at T _2, the right-eye glasses shutter is turned ON from OFF, the right eye image and recognizable Therefore, the backlights of the area indicated by Z in (b) are turned off all at once, so that the observer does not recognize both the left and right eye images together (3D crosstalk occurs).

In addition, the ratio of time during which the backlight is lit (BL Duty = t _BL / (t + t _BL + t _BK )) is 25% in the upper panel area and the central area as in the conventional case, but the lower panel area In the region corresponding to the r,..., N scanning lines, BL Duty = 33%.

  In the stereoscopic image display apparatus according to the present embodiment, the backlight lighting duty is varied within the panel surface, and the BL duty of the region corresponding to the r,... Since it is set higher than the central area, even if the backlight is turned off in the area indicated by Z in order to prevent the occurrence of 3D crosstalk, the lower area of the panel does not become dark, Occurrence can be suppressed.

  Further, for example, according to the present embodiment, as described above, OCB liquid crystal capable of high-speed response is used as the liquid crystal material used for the liquid crystal layer of the liquid crystal element and the optical shutter liquid crystal element 9, and between the left and right images. By adding black insertion and combining a scan backlight synchronized with panel scanning, the 3D crosstalk rate at 0 ° viewing angle (front direction) is 2% or less (more preferably 0), which does not cause any problem in display. 0.5% or less), and further 0.1% or less, 0.08%. Furthermore, the 3D crosstalk rate at a viewing angle of 60 ° could be 0.14%, which is 2% or less (more preferably 0.5% or less).

  The crosstalk rate used here is (BC) / A × 100% (A: left eye (or right eye) in a state where each of the left and right images is displayed in white) using a luminance meter and a goniometer. Incident luminance, B: Luminance incident on the left eye (or right eye) when the left image is displayed in black and right image is displayed in white, and C: Left eye (or right eye) when the left and right images are displayed in black. The value calculated in (the luminance incident on) is used.

  Furthermore, according to this embodiment, the occurrence of a luminance gradient in the screen due to the lighting control of the scan backlight is also eliminated.

Note that the backlight lighting period (t _BL , t _{BL ′} ) may be appropriately adjusted according to the preference of the observer, for example, by setting a longer period if brightness is important.

Also, the period (t _BK ) during which the black image is displayed is appropriately adjusted according to the preference of the observer, for example, if the video display is emphasized, the period is long, and if the brightness is important, the period is set short. It does not matter if possible.

(Second Embodiment)
Similar to the first embodiment, a second embodiment of a stereoscopic video display method using the stereoscopic video display device 10 shown in FIG. 1 will be described with reference to FIG.

Also in the present embodiment, as shown in FIG. 4A, when the left-eye video starts to be displayed on the first line of the scanning line at time T ₀ , the backlight corresponding to the first scanning line is After the delay time t elapses, the lighting starts, and the lighting is performed for t _BL until the left-eye video ends (before the black image writing starts). Also, the left-eye image starts to be displayed after (k−1) Δt at time T _{0 in} the k-th scanning line that is the central region of the panel, but the backlight corresponding to the k-th scanning line is displayed. Starts to be turned on after the elapse of the delay time t, and is turned on for _tBL until the left-eye video is finished (before the start of writing the black image). Further, r (r ≧ ((2n / 3) +1), r <n),..., Nth scanning line, which is the lower panel region, is left after (r−1) Δt of time T _0. When the eye image starts to be displayed, the backlights corresponding to the scanning lines in the r,..., Nth row start to be turned on simultaneously after the delay time t ′ (t ′ <t) has elapsed, and t _{BL ′.} After (t _{BL ′} > t _BL ) elapses, the lights are turned off all at once.

Further, the ratio of the time during which the backlight is lit (BL Duty = t _BL / (t + t _BL + t _BK )) is 25% in both the upper panel area and the central area, but the lower panel area (scanning line) In the case of n = r,... x), the point being 33% is the same as in the first embodiment.

However, in this embodiment, after the backlight of the lower panel area (scanning lines r,... N) where the left-eye video is displayed is turned off, the right-eye video is displayed on the first scanning line. In the area indicated by Y represented by the time t _Y until the backlight is displayed, the backlight in all areas of the liquid crystal panel is turned off.

This time t _Y is the response time for the liquid crystal transmittance to return to the initial state when the left eyeglass shutter is turned from ON to OFF, and the right eyeglass shutter from OFF, as shown in (c). It is determined in consideration of the response time until the transmittance of the liquid crystal rises to a desired value when turned on.

  Conventionally, even when one of the eyeglass shutters is turned off, 3D crosstalk sometimes occurs when the backlight is turned on due to the transient response of the liquid crystal. According to the present embodiment, the transient response characteristic of the liquid crystal In consideration of this, the backlight in all areas of the liquid crystal panel is turned off during this period, so that the occurrence of 3D crosstalk can be more effectively prevented.

(Third embodiment)
As in the first embodiment, a third embodiment of a stereoscopic video display method using the stereoscopic video display device 10 shown in FIG. 1 will be described with reference to FIGS.

  In the present embodiment, the first embodiment is the same as the first embodiment except that the light emission amount of the backlight corresponding to the scanning line of the panel upper region (1... (N / 3)) in the first embodiment is increased. Operates in the same way as the form.

  In the above-described stereoscopic display device, if the light emission amount of the backlight corresponding to the k-th scanning line which is the panel central region shown in FIG. 5A is represented by area A as shown in FIG. The response of the liquid crystal after the right eye image starts to be displayed on the eye scanning line is indicated by (c), and the response of the liquid crystal after the right eyeglass shutter is turned on is indicated by (d). The luminance when the observer looks at the scanning line of the k-th line is the light emission amount A of the backlight shown in (b), the responsiveness of the liquid crystal at the center of the panel shown in (c), and (d) The area B shown by (e) multiplied by the response of the liquid crystal of the right eyeglass shutter shown.

  On the other hand, the light emission amount of the backlight corresponding to the scanning line of the first row which is the panel upper region shown in FIG. 6A is made equal to the panel central region, and the area is the same as in FIG. When represented by A, the response of the liquid crystal after the right-eye image starts to be displayed on the first scanning line is indicated by (c), and the response of the liquid crystal after the right-eye glasses shutter is turned on is Since it is shown by (d), the brightness when the observer looks at the scanning line of the first row is the responsiveness of the liquid crystal at the top of the panel shown in (c) to the light emission amount A of the backlight shown in (b). And the area C shown by (e) multiplied by the response of the liquid crystal of the right eyeglass shutter shown by (d).

  As shown in FIG. 5, in the central region of the liquid crystal panel, the liquid crystal sufficiently responds to increase the transmittance as shown in (c), and the liquid crystal of the right eyeglass shutter also shows in (d). Since the backlight is turned on after the transmittance becomes high, the luminance does not decrease so much from the area of the initial region A (see the area of the region B in FIG. 5E). In the upper region, as shown in FIG. 6 (d), the backlight is lit in a state where the liquid crystal of the right eyeglass shutter is in a response stage and the transmittance is not sufficiently high. The area (FIG. 6B) decreases to the area C area (FIG. 9E).

  However, in the present embodiment, the light emission amount of the backlight corresponding to the scanning line in the panel upper region shown in FIG. 7A is the light emission amount of FIG. 6B as shown in FIG. It is 1.5 times larger than

  For this reason, for example, the response of the liquid crystal after the right-eye image starts to be displayed on the first scanning line is shown in FIG. 7C, and the response of the liquid crystal after the right-eye glasses shutter is turned on. Therefore, the luminance when the observer looks at the first scanning line is equal to the light emission amount A of the backlight shown in FIG. The area C ′ shown in FIG. 5E is obtained by multiplying the responsiveness of the liquid crystal at the upper portion of the panel shown by the responsiveness of the liquid crystal of the right eyeglass shutter shown in FIG.

  Since the area C ′ is substantially equal to the area B shown in FIG. 5E, the luminance at the top of the panel is almost equal to the luminance when the observer looks at the center of the panel, and the liquid crystal shutter is turned on. It is possible to suppress the luminance gradient caused by the difference between the timing and the panel response ON timing within the panel surface.

  Increasing the amount of light emitted from the backlight at the top of the liquid crystal panel can be achieved by increasing the LED current of the backlight corresponding to this portion.

(Other embodiments)
In the first to third embodiments, an example in which a black image having a predetermined width (25%) is displayed while the right-eye video and the left-eye video are displayed on the liquid crystal panel has been described. The width for inserting the black image can be changed as appropriate. Alternatively, the black image may be omitted and only the right eye video and the left eye video may be displayed.

  Further, the black image displayed on the liquid crystal panel may be a display method in which the display width of the black image changes with time instead of a predetermined width.

1: Scan converter, 2: Liquid crystal panel, 3: Backlight, 5: Liquid crystal shutter drive circuit, 7: Glasses shutter, 9: Optical shutter liquid crystal element, 10: Stereoscopic image display device

Claims (2)

It is composed of a plurality of active matrix liquid crystal elements and consists of n scanning lines extending in the row direction, and is divided into at least three regions, an upper region, a central region, and a lower region. A liquid crystal panel that displays images for the left and right eyes in a time-division manner by scanning in the column direction;
A backlight for illuminating the liquid crystal panel;
Glasses shutters having liquid crystal elements in the left eye part and the right eye part,
A liquid crystal shutter driving circuit for driving the liquid crystal panel and the eyeglass shutter synchronously,
The corresponding backlight is turned on after a lapse of a predetermined time since any one of the left and right eye images is displayed in each area of the liquid crystal panel, and the backlight lighting period that is turned on corresponding to the lower area, and the following The lighting period of the upper region that is turned on does not overlap, and further, by causing the backlight corresponding to at least a part of the scanning lines of the lower region to emit light earlier than the backlight corresponding to the immediately preceding scanning line, A stereoscopic video display apparatus characterized in that the lighting time ratio is made larger than the lighting time ratio of the backlight corresponding to the scanning lines of other portions.   It is composed of a plurality of active matrix liquid crystal elements and consists of n scanning lines extending in the row direction, and is divided into at least three regions, an upper region, a central region, and a lower region. A liquid crystal panel that displays images for the left and right eyes in a time-division manner by scanning in the column direction;
  A backlight for illuminating the liquid crystal panel; glasses shutters each having a liquid crystal element in the left eye part and the right eye part;
  A liquid crystal shutter driving circuit for driving the liquid crystal panel and the eyeglass shutter synchronously,
  A volume of light emitted from the backlight corresponding to at least a part of the scanning lines in the upper region of the liquid crystal panel is made larger than that emitted from the backlight corresponding to the scanning lines in other parts. Video display device.

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