KR101951297B1 - Image display device - Google Patents

Abstract

The present invention relates to an image display apparatus, which comprises a display panel for displaying left and right eye images; An optical path changing cell for changing paths of the left eye image and the right eye image; An optical path changing cell driver for driving the optical path changing cell; And a mode conversion unit for generating a mode conversion signal for implementing the left eye image and the right eye image in a horizontal display mode or a vertical display mode, wherein the first to third electrodes are formed in the optical path change cell, And the two electrodes are formed to be inclined by a first angle with respect to the first axis of the display panel.

Description

IMAGE DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus, and more particularly, to an image display apparatus capable of realizing a pivot function using an electrode arrangement and a view overlap of an optical path changing cell while maintaining an appropriate viewing distance.

As the information society has developed in recent years, the demand for the display field has been increasing in various forms, and image display devices capable of realizing not only two-dimensional plane images but also three-dimensional stereoscopic images have been developed in connection with the image realization method.

In addition to the binocular disparity due to the distance between the two eyes, there are psychological and memorizing factors for the depth and stereoscopic effect of the human image.

One of the three-dimensional stereoscopic image display methods using these factors is a stereoscopic type in which stereoscopic effect is felt using physiological factors of both eyes.

The stereoscopic type is the ability to generate the spatial information before and after the display surface in the process of fusion of the brain by providing the plane image of the plane including the parallax information in the left and right, That is, stereography is used.

Such a three-dimensional representation system includes a spectacle system in which a viewer wears special glasses according to a substantial three-dimensional sense generation position and a spectacle system in which a lens array such as a parallax barrier or a lenticular on the display surface side uses a lens array . ≪ / RTI >

Generally, the non-eyeglass system is superior to the eyeglass system in terms of 3D luminance.

The non-eyeglass image display apparatus includes a display panel for displaying left and right eye images, and an optical path changing cell disposed at the top or bottom of the display panel. The user can view the stereoscopic image without any separate tool It is being actively developed.

Here, the optical path changing cell may include a lens array such as a parallax barrier or a lenticular lens.

In particular, it is possible to construct a lens array using a liquid crystal lens panel including a liquid crystal layer. In this case, whether or not the liquid crystal layer functions as a lens can be determined depending on whether a voltage is applied or not.

Generally, a lens controls the path of incident light by using a difference in refractive index between air and the substance constituting the lens.

On the other hand, in the case of a liquid crystal lens panel, an imaginary lens is formed by an electric field formed by applying to each electrode, and the path of incident light incident from the display panel like the actual lens can be controlled by the phase-

An image display device including such a liquid crystal lens panel has an advantage that a two-dimensional (2D) mode and a three-dimensional (3D) mode can be selectively displayed.

Meanwhile, in recent years, functions implemented in a video display device are becoming more and more diversified, for example, a pivot function.

To describe this in detail, conventionally, an image display apparatus has been usually designed to display only one of a landscape image whose width in the horizontal direction is larger than the height in the vertical direction or a portrait image which is opposite thereto.

However, recently, an image display device having a pivot function for displaying a horizontal image or a vertical image by rotating the display device has been produced.

The image display device is controlled to operate in a landscape display mode or a portrait display mode according to the user's needs.

Hereinafter, a problem of implementing a pivot function with respect to an image display apparatus for displaying a stereoscopic image will be described with reference to the drawings.

1 is a diagram for explaining a driving principle for implementing a stereoscopic image in a general image display apparatus.

In order to implement a stereoscopic image in a general image display apparatus, the viewer must be spaced apart from the optical path changing cell 20 by the viewing distance D as shown in FIG. 1, It is necessary to be formed so as to be spaced from the cell 20 by the rear distance S.

At this time, the viewing distance D corresponds to the distance between the optical path changing cell 20 and the viewer, and the position separated by the viewing distance D from the optical path changing cell 20 is the distance between the left and right eye images Position.

The back distance S corresponds to the distance between the optical path changing cell 20 and the display panel 10 as a distance required to arrange the left eye image and the right eye image at a desired position.

Although not shown, the image display apparatus can implement a plurality of view images according to the viewing angle (direction).

In this way, an image display device implementing a plurality of viewpoint images suitable for each viewing angle (direction) so that an image can be expressed as it is according to a viewing angle (direction) is referred to as a multi-view image display device.

On the other hand, the relationship between the viewing distance D and the rear distance S is expressed by Equation (1).

[Equation 1]

In this case, D is the viewing distance, S is the back distance, E is the binocular distance, and P is the width of the stereoscopic image unit.

Here, since the binocular interval of the viewer is a fixed value, it is necessary to appropriately adjust the viewing distance D and the back distance S according to the width P of the stereoscopic image unit in order to realize a stereoscopic image in the image display apparatus have.

FIGS. 2A and 2B are views showing the arrangement of the stereoscopic image unit and the liquid crystal lens of the image display apparatus in the horizontal display mode and the vertical display mode, respectively. FIG. 3 illustrates a problem in implementing the pivot function in the conventional image display apparatus . ≪ / RTI > Will be described with reference to Fig.

2A, in the horizontal display mode, the plurality of stereoscopic image units 12 are arranged such that the long axis 3P of the stereoscopic image unit 12 is parallel to the long axis of the lens 28. [

At this time, the image displayed in the horizontal display mode is a landscape image in which the width in the horizontal direction (first direction) is larger than the height in the vertical direction (second direction).

Therefore, in the horizontal display mode, the direction of the long axis of the lens is parallel to the longitudinal direction (second direction) of the horizontal image.

2B, in the vertical display mode, the plurality of stereoscopic image units 12 are arranged such that the long axis 3P of the stereoscopic image unit 12 is parallel to the long axis of the lens 28. [

At this time, the image displayed in the portrait mode is a portrait image in which the width in the horizontal direction (first direction) is smaller than the height in the vertical direction (second direction).

Therefore, in the horizontal display mode, the direction of the long axis of the lens is parallel to the horizontal direction (first direction) of the vertical image.

In this case, the viewer can view the stereoscopic image in the horizontal display mode of the video display device, but the viewer can not view the stereoscopic video in the vertical display mode.

3, in the case of the horizontal display mode in which the horizontal image is displayed, the left eye image IL and the right eye image IR outputted from the display panel 10 are displayed by the optical path changing cell 20 Left and right.

Left and right eye images IL and right eye images IR are transmitted to the left and right eyes of the viewer, respectively, so that the viewer can recognize the stereoscopic images.

On the other hand, in the case of the vertical display mode in which the image display apparatus 1 is rotated by 90 degrees and the vertical image is displayed, the left eye image IL and the right eye image IR emitted from the display panel 10 are displayed on the optical path change cell 20 in the vertical direction.

Therefore, the left and right eye images IL and the right eye images IR can not be properly transmitted to the left and right eyes of the viewer, so that the viewer can not recognize the stereoscopic images.

The reason for such a problem arises from the arrangement of a plurality of electrodes for implementing the lens 28 in the optical path changing cell 20 for separating an image.

More specifically, when the display panel 10 and the optical path changing cell 20 are combined in the image display device 1, the optical path changing cell 20 is aligned (aligned) according to the arrangement of polarization axes of the display panel 10 the plurality of electrodes for realizing the lens 28 are arranged to correspond to the direction of the polarization axis of the display panel 10.

Therefore, even if the image display apparatus 1 performs the pivot function, the longitudinal direction of the lens 28 can not be changed due to the arrangement of the plurality of electrodes for realizing the lens 28 even when the display mode is changed to the portrait display mode.

As a result, in the vertical display mode, since the left eye image and the right eye image are separated vertically by the optical path changing cell, it is difficult to perform the pivot function in the image display device for displaying the stereoscopic image.

It is an object of the present invention to provide an image display device capable of realizing a pivot function using an electrode arrangement and view overlapping of an optical path changing cell and maintaining an appropriate viewing distance .

According to an aspect of the present invention, there is provided an image display apparatus including: a display panel for displaying a left eye image and a right eye image; An optical path changing cell for changing paths of the left eye image and the right eye image; An optical path changing cell driver for driving the optical path changing cell; And a mode conversion unit for generating a mode conversion signal for realizing the left eye image and the right eye image in a horizontal display mode or a vertical display mode, wherein a first electrode is formed in the optical path change cell, And is formed to be inclined by a first angle with reference to a short axis of the panel.

Here, the optical path change cell driver may control the formation of a lens or a slit by applying a driving voltage corresponding to the first electrode.

When the mode conversion signal is a horizontal display mode conversion signal, the optical path change cell driver controls the width of the lens or slit of the optical path change cell to be a first width, And a width of the lens or slit of the optical path changing cell is a second width larger than the first width in the case of a mode conversion signal.

The first electrode constitutes an electrode group for implementing the lens or the slit of the light path changing cell, and the electrode group may be a first electrode group for realizing the first width, And may be a second electrode group.

When the display panel is operated in the horizontal display mode, the width of the stereoscopic image unit of the display panel is P, and when the display panel operates in the vertical display mode, P '.

The display panel can output N view images (N is a natural number of 2 or more) according to a plurality of viewing directions.

Here, it is preferable that the interval between the N view-point images is 65 * k (0 < k? 1, k is a rational number) mm.

The liquid crystal rubbing direction of the light path changing cell may be the same as the direction of the polarization axis of the second substrate of the display panel.

As described above, in the image display apparatus according to the present invention, the pivot function can be realized by changing the electrode arrangement of the optical path changing cell and manufacturing the rubbing direction of the liquid crystal so as to match the direction of the polarization axis of the display panel.

The proper viewing distance can be maintained by changing the unit width of the optical path changing cell and the arrangement of the stereoscopic image units.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining a driving principle for realizing a stereoscopic image of a general image display apparatus. FIG.
2A and 2B are views showing the arrangement of the stereoscopic image unit and the liquid crystal lens of the image display apparatus in the horizontal display mode and the vertical display mode, respectively.
3 is a diagram for explaining a problem in implementing a pivot function in a conventional video display device.
4 is a view schematically showing an image display apparatus according to an embodiment of the present invention.
5 is a schematic cross-sectional view of an image display apparatus according to an embodiment of the present invention.
6A and 6B are views for explaining the arrangement of the lens and the stereoscopic image unit in the image display apparatus according to the embodiment of the present invention.
7A and 7B are views for explaining the size of a plurality of viewpoint images and the luminance distribution of an image in the image display device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a schematic view illustrating an image display apparatus according to an embodiment of the present invention, and FIG. 5 is a schematic cross-sectional view of an image display apparatus according to an embodiment of the present invention.

4, the image display apparatus according to the embodiment of the present invention includes a display panel 110, a light path changing cell 120, a display panel driving unit 130, and an optical path change driving unit 140 can do.

5, the display panel 110 includes a first substrate 111 and a second substrate 115 spaced from each other and spaced apart from each other and a first substrate 111 and a second substrate 115, And a first liquid crystal layer 117 formed thereon.

In the display panel 110, a plurality of stereoscopic image units may be defined that display the left eye image and the right eye image or display N (N is a natural number of 2 or more) view images according to the viewing angle (direction).

The distances between the axes of the liquid crystal lenses 129 are preferably the same.

In other words, the distances between the axes of the hypothetical liquid crystal lenses 129 must be the same so that the direction of the viewpoint images formed by the respective stereoscopic image units can be formed at uniform intervals.

Although not shown, a pixel electrode and a common electrode may be formed on the inner surfaces of the first substrate 111 and the second substrate 115. A data voltage is applied to the pixel electrode and a common voltage is applied to the common electrode, (117) is driven.

A first polarizer (not shown) and a second polarizer (not shown) are selectively attached to the outer surfaces of the first substrate 111 and the second substrate 115 to selectively transmit only specific light.

The optical path changing cell 120 includes a third substrate 121 and a fourth substrate 125 facing each other and a second liquid crystal layer (not shown) formed between the third substrate 121 and the fourth substrate 125 127).

At this time, the optical path changing cell 120 changes the path of the left eye image and the right eye image, and may be, for example, a barrier cell or a liquid crystal lens cell. Here, for convenience of explanation, I will explain it.

A plurality of first electrodes 122 spaced apart from each other are formed on the third substrate 121. An insulating layer 123 is formed on the plurality of first electrodes 122 and an insulating layer 123 is formed on the insulating layer 123 A plurality of spaced apart second electrodes 124 are formed.

Here, the plurality of first electrodes 122 are formed to correspond to the spacing intervals of the plurality of second electrodes 124, and the plurality of second electrodes 124 correspond to the spacing intervals of the plurality of first electrodes 122 .

In other words, the plurality of first electrodes 122 and the plurality of second electrodes 124 may be alternately arranged.

At this time, the plurality of first electrodes 122 and the plurality of second electrodes 124 may be the same electrode formed on the same layer.

A third electrode 128 is formed on the lower surface of the fourth substrate 125 and a second liquid crystal layer 127 is formed on the second substrate 124 and the second electrodes 124 and the fourth substrate 125, And is formed between the lower third electrodes 128.

The rubbing direction of the liquid crystal of the second liquid crystal layer 127 may be the same as the polarizing axis of the second polarizing plate (not shown) of the display panel 110.

A first driving voltage to a third driving voltage may be applied to the plurality of first electrodes 122, the plurality of second electrodes 124, and the third electrodes 128, respectively.

As the first to third driving voltages are suitably adjusted, the second liquid crystal layer 127 can be driven to serve as a virtual liquid crystal lens 129 which separates the incident light and emits the light in different directions.

Here, the first driving voltage to the third driving voltage may be supplied to the optical path changing cell 120.

The plurality of first electrodes 122 and the plurality of second electrodes 124 are arranged on the first axis (short axis) of the display panel 110 in the optical path changing cell 120 according to the present invention, As shown in FIG.

The plurality of first electrodes 122 and the plurality of second electrodes 124 may be grouped into electrode groups for implementing the liquid crystal lenses 129 of the light path changing cells 120 or slits.

At this time, the electrode group may be divided into a plurality of electrode groups for realizing the width of the liquid crystal 129 or the slit with different widths.

At this time, the number of electrodes constituting each electrode group may be different from each other.

For example, the electrode group may be a liquid crystal lens 129 or a first electrode group or a liquid crystal lens 129 which realizes the width of the slit to be a first width or a second electrode group which realizes a width of the slit to be a second width It can be divided.

This will be described in detail in FIGS. 6A and 6B.

Referring again to FIG. 4, the display panel driver 130 may control the display panel driver 130 to display the image signals RGB, the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the data enable signal DE, and the clock signal CLK And transmits the generated gate control signal and data signal to the display panel 110. The display panel 110 includes a display panel 110,

The display panel driver 130 may be mounted on a printed circuit board (PCB).

The optical path change cell driver 140 generates an optical path change cell drive signal using the interface signal, and transmits the generated optical path change cell drive signal to the optical path change cell 120.

That is, the optical path changing cell driver 140 controls the optical path changing cell 120 to transmit a light path changing cell driving signal (a plurality of driving voltages) to form a liquid crystal lens 129 or a slit (not shown) It plays a role.

The optical path changing cell driver 140 may control the width of the liquid crystal lens 129 or the slit of the optical path changing cell 120 to be changed in accordance with the mode conversion signal received from the mode changing unit .

For example, when the mode conversion signal is the horizontal display mode conversion signal, the width of the liquid crystal lens 129 or the slit of the optical path changing cell 120 is controlled to be the first width,

It is possible to control the width of the liquid crystal lens 129 of the optical path changing cell 120 to be the second width when the mode conversion signal is the longitudinal display mode conversion signal. (First width < second width)

The optical path change cell driver 140 may be formed in the form of an integrated circuit (IC) and mounted on a printed circuit board (PCB).

The system unit 150 outputs the video signal RGB, the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the data enable signal DE, and the clock signal CLK to the display panel drive unit 130 For example, a TV system or a graphics card.

Although not shown, the image display apparatus according to the present invention further includes a mode converter (not shown) for implementing the left eye image and the right eye image in the horizontal display mode or the vertical display mode.

Here, the mode converter generates a mode conversion signal and transmits the generated mode conversion signal to the optical path change cell driver 140.

Here, the mode conversion signal may be a horizontal display mode conversion signal for controlling conversion to a horizontal display mode for implementing a horizontal image, or a vertical display mode conversion signal for controlling conversion to a vertical display mode for implementing a vertical image.

The image display apparatus according to the present invention realizes a stereoscopic image using the parallax of both eyes.

At this time, in order to realize the stereoscopic image using the parallax of the binocular, the left eye image and the right eye image emitted from the display panel 110 need to be separated to the left and right eyes and transmitted to the left and right eyes of the viewer, respectively.

For example, a plurality of images output from the display panel 110 are changed by the optical path changing cell 120 so that the paths of the images are changed to separate the left eye image and the right eye image.

At this time, the separated left eye image and right eye image may be view images according to the viewing angle (direction).

Thus, the image display device separates a plurality of images output from the display panel 110 into a plurality of viewpoint images in the left and right directions as the path of the image is changed by the optical path changing cell 120, (Viewing direction), respectively.

Then, different viewpoint images are transmitted to the left and right eyes of the viewer, so that the viewer can feel the three-dimensional feeling and view appropriate images according to the viewing angle (direction).

That is, the image display apparatus according to the embodiment of the present invention can realize a stereoscopic image by using the optical path changing cell 120 without using special glasses such as polarizing glasses and shutter glasses.

6A and 6B are views for explaining the arrangement of the lens and the stereoscopic image unit in the image display apparatus according to the embodiment of the present invention. Will be described with reference to FIG.

6A, when the image display apparatus according to the embodiment of the present invention operates in the horizontal display mode, the liquid crystal lens 129 has its long axis aligned with the first axis (y axis) of the display panel Is formed to be inclined by one angle [theta].

The width of the liquid crystal lens 129 may be 'w1', which is the first width.

At this time, the width and height of the stereoscopic image unit 112 of the display panel 110 may be 'P' and '3P', respectively. For example, 'P' may be 105 um.

Here, the ratio of the width to the height of the stereoscopic image unit 112 is shown to be 1: 3, but it is not limited thereto and may be formed at various ratios such as 1: 1, 1: 2, and so on.

The electrode group for realizing the width of the liquid crystal lens 129 with the first width w1 when the image display apparatus according to the embodiment of the present invention operates in the horizontal display mode may be the first electrode group.

At this time, the first electrode group may be defined as m1 electrodes.

6B, when the image display apparatus according to the embodiment of the present invention operates in the portrait display mode, the liquid crystal lens 229 has its long axis aligned with the second axis (x axis) of the display panel By the first angle?.

The width of the liquid crystal lens 229 may be 'w2' which is the second width. (w2 > w1)

At this time, the width and height of the stereoscopic image unit 212 of the display panel 110 may be '3P' and 'P', respectively.

The electrode group for realizing the width of the liquid crystal lens 229 with the second width w2 when the image display apparatus according to the embodiment of the present invention operates in the vertical display mode may be the second electrode group.

At this time, the second electrode group may be defined as m2 electrodes. (m2 > m1)

Hereinafter, the reason why the liquid crystal lens is formed to be inclined in the image display apparatus according to the present invention will be described.

The relationship between the viewing distance and the back distance in the horizontal display mode and vertical display mode will be described with reference to Equation (2).

&Quot; (2) &quot;

D ', P', S ', and E' are the viewing distance in the horizontal display mode, the width of the stereoscopic image unit, the back distance, and the binocular interval, respectively. Viewing distance, width of the stereoscopic image unit, back distance, and binocular interval.

The width P 'of the stereoscopic image unit in the vertical display mode is three times the width P of the stereoscopic image unit in the horizontal display mode. (P '= 3P)

The binocular interval E 'in the vertical display mode is the same as the binocular interval E in the horizontal display mode. (E '= E)

On the other hand, since the rear distance is fixed, the rear distance S 'in the vertical display mode is the same as the rear distance S in the horizontal display mode. (S '= S)

As a result, the viewing distance D 'in the vertical display mode is one-third of the viewing distance D in the horizontal display mode. (D '= D / 3)

In other words, in the vertical display mode, as the width P 'of the stereoscopic image unit increases, the horizontal length of the image and the interval between the images also increase.

However, since the rear distance S 'and the binocular distance E' are fixed values, the distance between the viewer and the image display device (viewing distance) must be close to each other for the viewer to recognize the image.

In this case, the viewing distance can be maintained by using the view overlap (image overlap). In order to overlap the view, the liquid crystal lens needs to be formed so as to be inclined.

For example, when the interval between images is 65 / 2mm in the horizontal display mode, the interval between the two images is 195 / 2mm in the vertical display mode.

Accordingly, in the present invention, since the liquid crystal lens is formed so as to be inclined, the interval between the two images can be reduced by using the view overlap in which at least one image is arranged between the two images.

7A and 7B are views for explaining the size of a plurality of viewpoint images and the luminance distribution of an image in the image display device according to the embodiment of the present invention.

7A, when an image display apparatus according to an embodiment of the present invention is operated in the horizontal display mode, an image output from the two stereoscopic image units 112a and 112b is captured by a liquid crystal lens 229 Images.

In this case, the interval between two separated images is 'a', and the horizontal length of the image is 'c'.

7B, when the image display apparatus according to the embodiment of the present invention operates in the portrait display mode, the images output from the three stereoscopic image units 212a, 212b, and 212c are transmitted through the liquid crystal lenses 129 ) Into three images.

In this case, the interval between two separated images is 'b', and the horizontal length of the image is 'd'.

In this case, the interval (b) between two images in the vertical display mode can be changed according to the view overlap degree, and 65 * b (0 <k?

Since the width P 'of the stereoscopic image unit in the vertical display mode is three times (P' = 3P) of the width P of the stereoscopic image unit in the horizontal display mode, the interval between images is also tripled.

For example, if the interval (a) between two images in the horizontal display mode is 65 / 2mm, if there is no view overlap, the interval between two images in vertical display mode becomes 195 / 2mm.

That is, the interval between the images output to the first and second stereoscopic image units 212a and 212b is 195 / 2mm.

However, in the image display apparatus according to the present invention, since the image output from the third stereoscopic image unit 212c is disposed between the images output to the first stereoscopic image unit 212a and the second stereoscopic image unit 212b The interval between neighboring images is 'b', where b = 195 / 4mm.

The interval between neighboring images may vary depending on the degree of view overlapping.

That is, the number of images arranged between the images output to the first and second stereoscopic image units 212a and 212b.

As described above, in the image display apparatus according to the present invention, the electrode arrangement of the optical path changing cell is changed so as to be inclined by a certain angle with reference to the vertical axis (y axis) of the display panel, The rubbing direction is made in the same direction as the polarization axis direction of the display panel.

As a result, even if the image display device performs a pivot function and converts into a horizontal display mode or a portrait display mode, a large number of images are separated into right and left eyes and transmitted to the left and right eyes of a viewer.

The embodiments of the present invention as described above are merely illustrative, and those skilled in the art can make modifications without departing from the gist of the present invention. Accordingly, the protection scope of the present invention includes modifications of the present invention within the scope of the appended claims and equivalents thereof.

110: display panel 111: first substrate
115: second substrate 120: optical path changing cell
121: third substrate 125: fourth substrate
130: Display panel driver 140: Optical path change driver

Claims (9)

A display panel including a plurality of stereoscopic image units displaying a left eye image and a right eye image;
An optical path changing cell formed with a first electrode inclined by a first angle with respect to a minor axis of the display panel to change a path of the left eye image and the right eye image;
A light path change cell driver driving the light path change cell;
And a mode converter for generating a mode conversion signal for implementing the left eye image and the right eye image in a first display mode or a second display mode,
The width P 'of the stereoscopic image unit of the display panel in the second display mode is larger than the width P of the stereoscopic image unit in the first display mode (P'> P)
Wherein when the mode conversion signal is the first display mode conversion signal, the optical path changing cell separates an image output from the two stereoscopic image units, and the optical path changing cell driver drives the light path changing cell, Is controlled to be the first width,
Wherein when the mode conversion signal is a second display mode conversion signal, the optical path change cell separates an image output from the three stereoscopic image units, and the optical path change cell driver drives the light path changing cell, Is controlled to be a second width larger than the first width
The method according to claim 1,
Wherein the optical path changing cell driving unit controls the driving unit to apply a driving voltage corresponding to the first electrode to form a lens or a slit.


delete The method according to claim 1,
The first electrode constitutes an electrode group for implementing the lens or slit of the optical path changing cell,
Wherein the electrode group is a first electrode group for realizing the first width or a second electrode group for realizing the second width.
delete The method according to claim 1,
Wherein the display panel outputs N (N is a natural number of 2 or more) viewpoint images in a plurality of viewing directions.
The method according to claim 6,
Wherein the interval between the N view-point images is 65 * k (0 < k? 1, k is a rational number) mm.
The method according to claim 1,
Wherein the optical path changing cell includes a liquid crystal layer and the liquid crystal alignment direction of the liquid crystal layer is the same as the polarization direction of light output from the display panel.
delete

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