JP2002228980A - Stereoscopic image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device with which a stereoscopic image can satisfactorily be observed even when an observer's observation position changes. SOLUTION: The stereoscopic image display device has a light source means, an optical means, and a display device. After directivity is given to luminous flux emitted from the light source means by the optical means, the luminous flux is transmitted through left or right stripe pixels displayed on the display device, and the stereoscopic image is visually recognized by the observer. The stereoscopic image display device has a first position change means which changes at this time at least part of the light source means and at least part of horizontal relative position of the optical means or/and a second position change means which changes at least part of the light source means and at least part of the relative position of cross direction of the optical means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional image display device, and more particularly to a television, a video, and a computer capable of satisfactorily observing a three-dimensional image displayed on a display even if an observer changes the observation position in various ways. This is suitable for performing stereoscopic observation of image information on a monitor, a game machine, or the like.

[0002]

2. Description of the Related Art Conventionally, as a method of displaying a stereoscopic image, the polarization state of a light beam based on a parallax image for the left eye and that for the right eye is made different, and the light beam enters the left eye and the right eye via polarized glasses. There is a method of separating the left and right parallax images and observing a stereoscopic image. In this method, a liquid crystal shutter is provided on the display side to change the polarization state, and the polarization state is switched in synchronization with the field signal of the display image on the display. Separates the left and right parallax images by eye,
Observation allows stereoscopic viewing. But,
In the stereoscopic observation method using the polarized light, the observer must always wear polarized glasses, which has a disadvantage that it is troublesome.

On the other hand, a stereoscopic image display method for observing a stereoscopic image without using polarized glasses is disclosed in
In Japanese Patent No. 312941, the horizontal stripe composite parallax image LRP as shown in FIG. 2 is spatially separated into a left eye region and a right eye region over the entire screen at a wide observation position in the vertical direction, and the left and right eyes of the observer are separated. A method of observing a stereoscopic image by setting each region has been proposed.

In the stereoscopic observation system disclosed in Japanese Patent Application Laid-Open No. 9-31294, an observer is spatially separated into a left eye region and a right eye region set based on an average binocular center distance of about 65 mm. I have a stereoscopic view within the range. In the method disclosed in the publication, there is room for further improvement in that the observer needs to observe with the position of the head fixed in order to set the left and right eyes in the respective areas.

On the other hand, Japanese Patent Laid-Open No. Hei 10-7856 discloses a system which enables stereoscopic viewing without fixing the head position.
No. 3 proposes this. In this method, a position detecting means for detecting the position of the observer is provided, and the shape of the light beam can be changed by using a spatial modulation element or the like in a part of the light source means for emitting the light beam from a checkered opening. It is like that. The position of the left eye region and the right eye region that are spatially separated are changed by changing the opening shape of the light beam having a checkered opening shape according to the position of the observer.

For example, it is assumed that a checkerboard-shaped opening pattern is configured such that a pair of horizontal openings and a light-shielding portion are twice the pixel size of the spatial light modulator. In this case, when the patterns of the checkerboard-shaped opening and the light-shielding portion are reversed (replaced), the spatial relationship between the spatially separated left-eye region and right-eye region is reversed (replaced). In other words, when the position of the observer moves to the position of reverse stereoscopic viewing, reverse stereoscopic viewing can be avoided by inverting the pattern of the checkerboard-shaped opening and the light-shielding portion. In this example, when the position of the observer is at the boundary between the left eye region and the right eye region that are spatially separated, crosstalk is observed. Furthermore, when the pattern of the checkerboard-like opening and the light-shielding part is reversed, the switching between the spatially separated left-eye region and right-eye region is discontinuous, and the observer observes the display screen flickering. In that regard,
There is room for further improvement. FIGS. 29A and 29B are explanatory diagrams of a checkerboard pattern displayed on the spatial light modulator and a horizontal cross section of a scanning line displaying the horizontal stripe composite parallax image LRP for the left eye. is there.

As shown in FIG. 29A, for example, a pair of openings and a light-shielding portion in a checkered pattern in the horizontal direction are constituted by ten pixels of a spatial modulation element. In this case, FIG.
As shown in FIG. 9 (B), the pattern of the checkerboard-shaped opening and the light-shielding portion can be changed in units of one pixel of the spatial light modulator, so that the pattern smoothly follows the observer's movement and spatially follows the observer. Separated left and right eye regions can be presented. Furthermore, by changing the pixel pitch in the horizontal direction of the spatial modulation element forming the checkered pattern, it is possible to present the stereoscopic observation area while following the observer's movement in the front-back direction.

In this example, a black matrix portion in a checkered opening is observed as a dark portion (black stripe pattern).

Japanese Patent Application Laid-Open No. 2000-502225 discloses position detecting means for detecting the position of an observer, a checkered pattern mask with a taper, and a lens-shaped screen with a taper. The position in the left-right direction controls the position in the left-right direction of the tapered checkered pattern mask, and the position in the front-rear direction controls the vertical position of the tapered lenticular screen.

In the tapered lens-shaped screen in this example, the radius of curvature of the lens gradually changes along the taper, and it is difficult to manufacture such a tapered lens with high accuracy.

[0011]

SUMMARY OF THE INVENTION The present invention further improves each of the above-described stereoscopic image display devices, and enables a stereoscopic observation area in which a stereoscopic image can be observed in the left, right, front and rear directions while smoothly following the observer's observation position. It is an object of the present invention to provide a three-dimensional image display device which can observe a high-quality three-dimensional image which is not affected by a black matrix.

[0012]

The three-dimensional display device according to the present invention comprises a light source means, optical means having different optical functions in horizontal and vertical directions, and a transmissive display device. A left stripe pixel and a right stripe pixel obtained by dividing the parallax image for the left eye and the parallax image for the right eye into a plurality of stripe-shaped pixels are alternately arranged in a predetermined order on the device to form one image. A stripe composite image is displayed, and the luminous flux emitted from the light source means is given directivity by the optical means, and then transmitted through the left or right stripe pixel displayed on the display device to be separated into different areas, respectively, to thereby form a three-dimensional image. In a three-dimensional image display device that allows an image to be visually recognized by an observer, a relative position in a front-rear direction of at least a part of the light source unit and at least a part of the optical unit is changed. It is characterized by having a second position changing means.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided first position changing means for changing a horizontal relative position of at least a part of the light source means and at least a part of the optical means. It is characterized by:

According to a third aspect of the present invention, there is provided a three-dimensional display device comprising: a light source means; optical means having different optical functions in a horizontal direction and a vertical direction; and a transmission type display device. A left stripe pixel and a right stripe pixel obtained by dividing each of the parallax image for right eye and the parallax image for the right eye into a plurality of stripe pixels are alternately arranged in a predetermined order to display a stripe composite image as one image. Then, after giving a directivity to the light beam emitted from the light source means by the optical means, the left or right stripe pixel displayed on the display device is transmitted and separated into different areas to allow a three-dimensional image to be visually recognized by an observer. In the three-dimensional image display device to be shown, observation position input means for inputting observation position information of the observer, at least a part of the light source means and a small number of the optical means are provided. At least a second position changing means for changing a relative position in the front-rear direction and a second position control means for controlling the relative position in the front-rear direction according to the output from the observation position input means. It is characterized by having.

According to a fourth aspect of the present invention, in the third aspect of the invention, first position changing means for changing a horizontal relative position of at least a part of the light source means and at least a part of the optical means, and the observation position. And a first position control means for controlling the relative position in the horizontal direction in accordance with an output from the input means.

According to a fifth aspect of the present invention, there is provided a three-dimensional image display apparatus comprising: a light source means; optical means having different optical functions in a horizontal direction and a vertical direction; and a transmission type display device.
A left stripe pixel and a right stripe pixel obtained by dividing each of the left-eye parallax image and the right-eye parallax image into a plurality of stripe-shaped pixels are alternately arranged in a predetermined order on the display device to form one image. After the stripe composite image is displayed, the luminous flux emitted from the light source means is given directivity by the optical means, and then the left or right stripe pixels displayed on the display device are transmitted and separated into different areas. A three-dimensional image display device that allows a viewer to view a three-dimensional image is characterized by having position changing means for changing a vertical relative position of the stripe image on the display device and the light source means.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, an observation position input means for inputting observation position information of an observer, and the relative position is controlled in accordance with an output from the observation position input means. And position control means.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the optical means is a first type comprising a plurality of vertically long cylindrical lenses arranged in a horizontal direction.
And a second cylindrical lens array in which a plurality of cylindrical lenses that are long in the horizontal direction are arranged in the vertical direction.

According to an eighth aspect of the present invention, in the light emitting device according to the seventh aspect, the light source means is configured to illuminate a mask substrate or a spatial light modulator having a checkerboard-shaped opening and a light shielding portion with a surface light source, or to emit light by itself. A light emitting pattern comprising a checkered light emitting portion and a non-light emitting portion is formed on the light emitting surface of the display device, and a pair of horizontal pitches of the checkered pattern of the light source means is the first cylindrical lens array. Are formed corresponding to the horizontal pitch, and the stripe composite image is obtained by dividing each of the parallax image for the left eye and the parallax image for the right eye into a plurality of stripe-shaped pixels in the horizontal direction. It is characterized by comprising a horizontal stripe image in which each stripe pixel is alternately arranged in a predetermined order in the vertical direction to form one image.

A ninth aspect of the present invention is characterized in that, in the eighth aspect of the present invention, stripe pixels for the left and right eyes constituting the horizontal stripe image are alternately displayed for each scanning line of the display device.

According to a tenth aspect of the present invention, in the seventh aspect, the vertical pitch of the second cylindrical lens array constitutes a pair of vertical pitches of the checkerboard pattern of the light source means and the horizontal stripe image. It is formed corresponding to each stripe pixel pitch.

According to an eleventh aspect of the present invention, in the third, fourth or sixth aspect, the observation position input means sets observation position detection means for detecting observation position information of the observer, or sets observation position information. Observation position setting means for performing
Characterized by having at least one of the following.

According to a twelfth aspect of the present invention, in accordance with the eleventh aspect of the present invention, there is provided an index presenting means for presenting an auxiliary index for setting the observation position by the observer in accordance with an output from the observation position setting means. And

According to a thirteenth aspect of the present invention, in the eleventh aspect of the present invention, the observation position setting means is provided for the observer to set an observation position by remote control from an observation position separated by a predetermined distance from the stereoscopic image display device. It is characterized by having remote input operation means for performing operations.

According to a fourteenth aspect of the present invention, the observation position detecting means detects the horizontal position of the observer in the invention of the eleventh aspect, and the observation position setting means sets the position of the observer in the longitudinal direction of the observation. It is characterized by doing.

According to a fifteenth aspect of the present invention, in the eighth aspect of the present invention, a mark index for detecting the position of the mask substrate is provided on the mask substrate on which the openings of the checkerboard pattern and the light shielding portions are formed. .

In a sixteenth aspect, in the seventh aspect, the first position changing means changes a horizontal position of the light source means or the first cylindrical lens array.

According to a seventeenth aspect of the present invention, in the invention according to any one of the first to sixth aspects, the optical means comprises: a first cylindrical lens array comprising a plurality of vertically long cylindrical lenses arranged in a horizontal direction; The second is composed of vertically long cylindrical lenses
Wherein the second position changing means changes the position of the light source means or the first cylindrical lens array in the front-rear direction.

According to an eighteenth aspect of the present invention, the position of the first cylindrical lens in the generatrix direction and the position in the front-rear direction of the first cylindrical lens are changed by a parallel link mechanism.

According to a nineteenth aspect of the present invention, in the invention according to any one of the first to sixth aspects, the optical means comprises: a first cylindrical lens array formed by arranging a plurality of vertically long cylindrical lenses in a horizontal direction; The second is composed of vertically long cylindrical lenses
Wherein the first position changing means changes the horizontal position of the light source means, and the second position changing means changes the front-back position of the first cylindrical lens array. The first position changing unit and the second position changing unit change the position of the light source unit or the first cylindrical lens array in the horizontal direction and the front-back direction.

According to a twentieth aspect of the present invention, in the second or fourth aspect, the light source means has a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction, and the light source means is a checkered pattern. A mask substrate or a spatial modulation element having a light-emitting portion and a light-shielding portion is configured to be illuminated with a surface light source, or a light-emitting portion composed of a checkered light-emitting portion and a non-light-emitting portion is provided on the light-emitting surface of a self-luminous display element. A pattern is formed, and a pair of horizontal pitches of the checkerboard pattern of the light source means is formed corresponding to a horizontal pitch of the first cylindrical lens array, so that the observer can correctly see the three-dimensional pattern. X represents a distance moved in the horizontal direction from a reference position where an image can be visually recognized, and air exchange between the observer and the first cylindrical lens array at the reference position. Distance Lh1, the equivalent air distance between said light source and said means in said reference position first cylindrical lens array Lh2, the horizontal pitch of the openings or light-shielding portion of the checkered pattern of the light source means Hm,
Assuming that the horizontal pitch of the cylindrical lenses of the first cylindrical lens array is HL, the light source means is moved in a horizontal direction from a position where the observer is at the reference position.

[0032]

(Equation 8)

Moving in the direction opposite to the direction in which the observer has moved by the distance D represented by the following formula, or moving the first cylindrical lens array in a horizontal direction from the position where the observer is at the reference position. It is characterized in that it moves in the same direction as the direction in which the observer has moved by the distance D.

According to a twenty-first aspect of the present invention, in the first, second, third, or fourth aspect, the optical means has a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction. The distance that the observer has moved in the front-rear direction from the reference position where the observer can correctly view the stereoscopic image is Z, and the first cylindrical lens array is moved in the front-rear direction from the position when the observer is at the reference position. Moves in a direction away from the display device,

[0035]

(Equation 9)

When the observer moves in a direction approaching the display device,

[0037]

(Equation 10)

Move in the same direction as the direction in which the observer has moved by the distance C1 represented by Or when the observer moves in the direction away from the display device in the front and rear direction from the position where the observer is at the reference position or the light source means,

[0039]

[Equation 11]

When the observer moves in a direction approaching the display device,

[0041]

(Equation 12)

The observer moves in a direction opposite to the direction in which the observer moves by a distance C2 represented by

The invention of claim 22 is characterized in that, in the invention of claim 5 or 6, the position changing means changes the vertical relative position of the display device and the light source means by a mechanical drive mechanism.

According to a twenty-third aspect of the present invention, the distance between the eyes of the observer is E, the pixel pitch in the vertical direction of the display device is Vd, the opening or the light-shielding part of the checkerboard pattern of the light source means. If the vertical pitch of Vm is Vm, and the distance horizontally moved from the reference position where the observer can correctly view the stereoscopic image is substantially equal to an odd multiple of the interocular distance E, the observer is positioned at the reference position. Inverting the left-right relationship of the left and right horizontal stripe pixels that make up the horizontal stripe image when in, or moving the display device more vertically than the position when the observer is in the reference position.

[0045]

(Equation 13)

Moving the light source means in the vertical direction from the position where the observer is at the reference position.

[0047]

[Equation 14]

It is characterized in that the light source means only moves, or the positional relationship between the checkerboard-like opening of the light source means and the light-shielding part or the light-emitting part and the non-light-emitting part is reversed when the observer is at the reference position. .

[0049]

[First Embodiment] FIG. 1 is a perspective view of a main part of a first embodiment of a stereoscopic image display apparatus according to the present invention.

In FIG. 1, reference numeral 1 denotes a transmission type display device, which is constituted by a liquid crystal element (LCD). The display device 1 displays a stripe image having parallax as described later. Reference numeral 2 denotes a display pixel portion including a liquid crystal layer formed between two glass substrates 3. In the figure, a display device 1 includes a polarizing plate, a color filter, an electrode, a black matrix,
The antireflection film and the like are omitted.

Reference numeral 4 denotes a backlight (surface light source) serving as an illumination light source. Display device 1 and backlight 4
A mask 5 having a checkered pattern and two lenticular lenses 8 and 9 are arranged between them.

The mask 5 has a checkered opening 6t and a light shielding portion 6
s having a mask pattern 6 and a mask substrate 7,
The mask pattern 6 is manufactured by patterning a metal deposition film such as chromium or a light absorbing material on a mask substrate 7 made of glass or resin. The backlight 4, the mask 5, and the like constitute one element of the light source means.

The two lenticular lenses 8 and 9 constitute one element of the optical means, are disposed between the mask 5 and the display device 1, and are made of a transparent resin or a glass material. The lenticular lens (first lenticular lens) 8 includes a first cylindrical lens array formed by arranging a plurality of cylindrical lenses 8a long in the vertical direction (V direction) in the horizontal direction (H direction).

The lenticular lens (second lenticular lens) 9 is composed of a second cylindrical lens array in which a plurality of cylindrical lenses 9a long in the horizontal direction (H direction) are arranged in the vertical direction (V direction).

Reference numeral 10 denotes a position sensor (observation position detection means) for detecting the position of the observer 101, for example, the pupil position. There have been many proposals for the method of detecting the position of the observer, and in the present embodiment, various methods capable of detecting the position of the observer in the horizontal direction and the front-back direction can be used. For example, a method is used in which an image of the observer's head is photographed with a TV camera, and the center position of the observer's face is obtained by image processing. In addition, the front-back direction of the observer (observation front-back direction)
For the position detection, a known autofocus method such as a camera or a method using a stereo camera may be used.

M1 is first driving means (first position control means) for displacing the position of the mask 5. M2 is second driving means (second position control means) for displacing the position of the lenticular lens 8.

Reference numeral 11 denotes a drive control device. The drive control device 11 receives the position information on the observer detected by the position sensor 10, and receives the first drive unit M1 and the second drive unit M2.
To output a drive signal to the controller.

FIG. 2 is an explanatory diagram of an image (parallax image) displayed on the display device 1.

FIG. 2A is a parallax image LP for the left eye, and FIG.
(B) is a parallax image RP for the right eye.

As shown in FIG. 2A, the parallax image for the left eye is divided into a plurality of horizontal stripe pixels L1, L2,... L (2n-1), L (2n) in the horizontal direction. Similarly, as shown in FIG. 2B, the horizontal stripe pixels R1, R2,... R (2n−
1) Divide into R (2n).

The parallax image L for the left and right eyes thus divided
P and RP are, for example, parallax images L1, R2, L3, R4,... L (2n-1) from the screen as shown in FIG.
R (2n) and a horizontal stripe-shaped composite parallax image LRP, which is arranged alternately for each scanning line to form one image, are displayed on the display device 1.

FIG. 3 is a conceptual diagram showing the observation state of a stereoscopic image.

The horizontal stripe composite parallax image LRP displayed on the display device 1 as shown in FIG. 3 is oriented using the optical means and the optical systems 8 and 9 so as to converge on the left eye EL and the right eye ER of the observer, respectively. A three-dimensional image is displayed by alternately illuminating parallax images for each scanning line with the obtained light flux. Such an illumination light beam is generated by an illumination optical system LI0 composed of a backlight 4, a mask 5, and lenticular lenses 8, 9.

FIG. 4 shows an LIO horizontal plane (H) of the illumination optical system.
The optical function V) will now be described.

Each parameter in FIG. 4 is as follows.

Fh: focal length of the cylindrical lens 8a Lh1: optical distance (air equivalent distance) between the observer 101 and the lenticular lens (up to the principal point of the lenticular lens 8) Lh2: mask 5 and lenticular Optical distance of the lens 8 HL: pitch of the lenticular lens 8 Hm: horizontal pitch between the opening 6t of the mask 5 and the light-shielding portion 6s E: distance between the eyes of the observer 101 FIG. 4A shows a composite parallax image of a horizontal stripe. Horizontal stripe pixel L of display device 1 displaying LRP
FIG. 4 is a cross-sectional view taken along a horizontal plane passing through (2n-1), and FIG.
(B) is an explanatory diagram on a horizontal plane (plane HV) passing through the horizontal stripe pixel R (2n).

In FIGS. 4A and 4B, the position of the opening 6t of the mask 5 and the position of the light shielding portion 6s are interchanged in the horizontal direction. As described above, the row of the horizontal openings 6t and the light-shielding portions 6s of the mask 5 has the openings 6t for each of the horizontal stripe pixels L (2n-1) and R (2n) of the display device 1.
And the positions of the light shielding portions 6s are interchanged.

A line connecting the center of each opening 6t of the mask 5 and the center of each cylindrical lens 8a of the lenticular lens 8 corresponds to the left eye position EL of the observer in FIG. 4A and the right line in FIG. The horizontal pitch Hm of the opening 6t of the mask 5 and the light shielding portion 6s and the horizontal pitch HL of the lenticular lens 8 are set so as to intersect at the eye position ER. Each cylindrical lens 8a is connected to each opening 6t.
Is set so that the divergent light beam from the backlight 4 that has passed through is converted into a parallel light beam.

In FIGS. 4A and 4B, the lenticular lens 9 acts as a parallel means having no refractive power.

The conditions in the horizontal direction for each element described above are expressed as follows.

[0071]

[Equation 15]

Equation (1) defines the focal length fh of each cylindrical lens 8a constituting the lenticular lens 8 for converting the divergent light beam from the backlight 4 passing through the opening 6t of the mask 5 into a parallel light beam. It is.

[0073]

(Equation 16)

Equation (2) is a condition that the horizontal width of the observation area in the observation position at a distance Lh1 from the lenticular lens 8 is the interocular distance E.

[0075]

[Equation 17]

Equation (3) indicates that a straight line connecting the center of each opening 6t of the mask 5 and the center of each cylindrical lens 8a constituting the lenticular lens 8 is the position (EL or ER) of the left or right eye on the observation screen. Is a condition for crossing one point.

Therefore, the divergent light beams from the backlight 4 that have passed through the openings 6t of the mask 5 become parallel light beams by the respective cylindrical lenses 8a of the lenticular lens 8 so as to gather at the position of the left eye EL or the right eye ER of the observer. , Illuminating the horizontal stripe pixels L (2n-1) and R (2n) of the display device 1 respectively,
Reach left or right eye. In this way, the observer at the optimum observation distance L can view the horizontal stripe composite parallax image LRP displayed on the display device 1 while being spatially separated. That is, stereoscopic vision is made possible.

FIGS. 5, 6, and 7 illustrate the optical function of the illumination optical system LI0 on the vertical plane (VZ).

FIG. 5A is an explanatory diagram on a vertical plane including the left eye EL, and FIG. 5B is an explanatory diagram on a vertical plane including the right eye ER.

Each parameter in FIG. 5 is as follows.

Fv: focal length of the cylindrical lens 9a Lv1: optical distance between the display pixel section 2 and the lenticular lens 9 Lv2: optical distance between the mask 5 and the lenticular lens 9 Vd: vertical pixel pitch VL of the display pixel section 2 : Pitch of lenticular lens 9 Vm: Vertical pitch of opening 6t of mask 5 and light-shielding portion 6s The vertical plane is the center of each opening 6t of mask 5, the center of cylindrical lens 9a constituting lenticular lens 9, and the display device. 1 horizontal stripe pixel L
(2n-1) and the center of R (2n) are arranged in a straight line. The divergent luminous flux from the backlight 4 that has passed through the openings 6t arranged in the horizontal direction of the mask 5 is given directivity to the left or right eye direction by the action of the lenticular lens 8 as described above, The horizontal stripe pixels L (2n-1) and R of the display device 1 are formed by the cylindrical lenses 9a constituting the lens 9.
(2n). That is, the illumination light having directivity in the direction of the left eye EL or the right eye ER due to the action of the lenticular lens 8 is applied to the corresponding horizontal stripe pixels L without crosstalk.
Only (2n-1) and R (2n) are illuminated.

In the vertical plane (VZ), the lenticular lens 8 only functions as a parallel flat plate.

FIGS. 6 and 7 are conceptual diagrams of a vertical plane.

In FIG. 6, the divergent light beam transmitted through the opening 6t of the mask 5 is converted into a plurality of horizontal stripe pixels L (2n−) of the display device 1 corresponding to the left eye EL by the respective cylindrical lenses 9a constituting the lenticular lens 9.
1) is illuminated. In FIG. 7, one horizontal stripe pixel L (2n-1) of the display device 1 is shown.
Is illuminated with a divergent light beam transmitted through a plurality of openings 6t in the vertical direction. In other words, all the luminous fluxes provided with directivity so as to gather at the left eye EL position always illuminate the horizontal stripe pixels L (2n-1) for the left eye, and no crosstalk occurs. This relationship holds true for the right eye as well, and the horizontal stripe pixel L (2n−
The light beams converged on 1) and R (2n) become divergent light beams from the light beams and spread in the vertical direction toward the observation position, forming a wide viewing area in the vertical direction on the optimum observation viewing plane.

The conditions in the vertical direction for each element described above are expressed as follows.

[0086]

(Equation 18)

The equation (4) defines the focal length of each cylindrical lens 9 a so that the mask pattern 6 of the mask 5 forms an image on the display pixel portion 2 of the display device 1 by each cylindrical lens 9 a of the lenticular lens 9. It is.

[0088]

[Equation 19]

Formula (5) defines the image magnification and Vm so that the vertical pitch Vm of the opening 6t and the light shielding portion 6s of the mask 5 is formed to fill the vertical pitch Vd of the horizontal stripe pixels of the display device 1. Is what you do.

[0090]

(Equation 20)

Equation (6) is a condition for diverging light beams transmitted through each opening 6t of the mask 5 to illuminate a horizontal stripe pixel of the display device 1 with respect to one corresponding eye by each cylindrical lens 9a of the lenticular lens 9. is there.

The operation of the illumination optical system in the horizontal and vertical directions described above describes the main lobe, and the divergent light beam transmitted through the opening 6t of the mask 5 forms a side lobe. When these are combined, as shown in FIG. 3, in the observation region on the optimum observation viewing plane, side lobes are alternately formed in a vertical stripe shape around the main lobe at a period twice as long as the interocular distance E. The observer can correctly observe a stereoscopic image in an appropriate stereoscopic viewing area in which a left-eye parallax image can be observed in the left eye EL and a right-eye parallax image can be observed in the right eye ER.

In the first embodiment, the position of the observer 101 is detected by the position sensor 10, and some components of the illumination optical system are driven and controlled in accordance with the position so that the observer follows the stereoscopic vision region. I have to. First, a case where the observer 101 moves in the left-right direction will be described.

As shown in FIG. 3, for example, the observer 101
The left eye reference position X ₁ in which the position of the left eye EL is set in advance
, It is assumed that the observer has correctly observed the stereoscopic image. When the viewer's left eye position is moved to a position X ₂ which is shifted a distance X in the horizontal direction from the position X _1, generally crosstalk and inverse stereoscopic outside the proper stereoscopic vision region is generated, the correct stereoscopic image I can't observe. In the present embodiment, the position of the observer 101 is detected, and the mask 5 or the lenticular lens (vertical lenticular lens) 8 is moved in the horizontal direction in accordance with the position, thereby correcting crosstalk and reverse stereoscopic vision and appropriately. A stereoscopic image is observed by correctly following a stereoscopic viewing area. At this time, the mask 5
May be electrically moved in the horizontal direction between the opening of the mask 5 and the light-shielding portion.

FIG. 8 shows a horizontal stripe pixel L (2n-1).
Is a cross-sectional view of a horizontal plane through the is an explanatory view when the left eye of the observer moves to a position X ₂ which is shifted a distance X in the horizontal direction from the position X _1.

In order to form an appropriate stereoscopic viewing area at the position X ₂ , each of the openings 6 t
Must meet the condition that the line connecting the center of the lenticular lens 8 and the center of each cylindrical lens 8a of the lenticular lens 8 intersect at the left eye position of the observer. In the present embodiment, as shown in FIG. 8, the distance D in the horizontal direction of the mask 5 from the position D ₁
By moving to a position shifted by D _2, we shall meet this condition.

That is, when the observer has moved the distance X to the right, the mask 5 is moved leftward (in the direction opposite to the movement of the observer) by the distance D. As a result, the observation area in the form of a vertical stripe on the optimal observation viewing plane as shown in FIG. 3 moves horizontally to the right by the distance X as a whole, and the observer can correctly observe the stereoscopic image.

In this case, the moving distance X of the observer and the mask 5
Can be expressed by the following equation from a geometric relationship as shown in FIG.

[0099]

[Equation 21]

Further, from Expressions (3) and (7), it can be expressed as follows.

[0101]

(Equation 22)

Lh1, Lh2, Hm, and HL are determined when designing to satisfy the equations (1) to (6), respectively, and the equations (7) and (8) are based on the predetermined left eye reference. by measuring the movement distance X in the horizontal direction from the position X _1, shows that the amount D to move the mask 5 in the horizontal direction seen.

Although the mask 5 is moved by the distance D in the present embodiment, the observation area can be moved by the distance X in the horizontal direction even if the lenticular lens 8 is moved by the distance D. In this case, the lenticular lens 8 is moved in the same direction as the movement of the observer.

Next, the observer moves in the front-back direction (observation front-back direction).
The case where the user has moved to will be described.

[0105] As shown in FIG. 3, for example, when in the reference position Z ₁ of the left-eye left eye EL position of the observer is set in advance, the viewer is to have been properly observe a stereoscopic image. When the viewer's left eye position is a position Z ₂ shifted distance Z in the longitudinal direction from the position Z _1, generally crosstalk generated deviates from the optimum observation viewing surface, it is impossible to correctly observe the stereoscopic image .

FIG. 9 illustrates this situation.
It is sectional drawing in the horizontal plane (HZ plane) containing both eyes of an observer. Observer is indicative of if you observe the correct stereoscopic image at the position Z _1, right at the optimum viewing plane including the position Z ₁ as shown, and the left-eye observation area ELS a width of interocular distance E The eye observation areas ERS are formed alternately. In particular, in the region of the main lobe distributed in the front central portion of the display device 1, the observer can correctly observe the stereoscopic image in the region of the distance Za in the front-rear direction,
In a region exceeding this, crosstalk occurs and a stereoscopic image cannot be observed.

In this embodiment, the position of the observer is detected by the position sensor 10, and the mask 5 or the lenticular lens 8 is moved in the front-rear direction in accordance with the position.
The crosstalk in the observation viewing plane is corrected, and an appropriate stereoscopic vision area is followed so that a stereoscopic image is correctly observed.

FIGS. 10 and 11 show horizontal stripe pixels L.
Is a cross-sectional view at (2n-1) horizontal plane through the is an explanatory view when the left eye of the observer moves to a position Z ₂ shifted Z in the longitudinal direction from the position Z _1. FIG. 10 shows the case where the observer can be separated from the display 1, and FIG. 11 shows the case where the observer approaches the display.

In order to form a proper stereoscopic viewing area at the position Z ₂ , each of the openings 6 t
Must meet the condition that the line connecting the center of the lenticular lens 8 and the center of each cylindrical lens 8a of the lenticular lens 8 intersect at the left eye position of the observer. In the present embodiment, FIG.
0, as shown in FIG. 11, by moving to a position C ₂ in which the front-rear direction displacement distance C lenticular lens 8 from the position C _1, meets this condition. That is, observer 1
When 01 moves away from or near display 1 by distance Z, lenticular lens 8 also moves by distance C in the same direction as the observer moves. Optimal observation viewing plane from the plane including the position Z ₁ Thus, the display 1
Is formed on the surface including the position Z ₂ which is moved in a direction by a distance Z which direction or closer away from.

FIG. 12 is a cross-sectional view of a horizontal plane including both eyes of the observer for explaining the enlargement of the observation area in the front-back direction. Offset distance Z in the longitudinal direction of the observation area of the main lobe from the position Z ₁ in FIG. 9, and is formed at a position Z _2. As shown in the figure, the observer moves the distance Z in the front-back direction.
It is possible to correctly observe a stereoscopic image in the area b. In other words, this indicates that the observation area in the front-back direction is enlarged by Zb-Za.

At this time, the optically converted optical distance between the mask 5 and the lenticular lens 8 is from Lh2 to Lh2 + C
In order to satisfy the condition of Expression (1), the focal length f of each cylindrical lens 8a of the lenticular lens 8
h must be changed. However, it is difficult to arbitrarily change the focal length of the lenticular lens 8 made of transparent resin or glass. For this reason, since the image formation relationship between the mask 5 and the lenticular lens 8 is disrupted, crosstalk occurs in a part of the illuminating light having directivity in the left eye or right eye direction.

[0112] Figure 13, Figure 14 is for explaining this state, FIG. 13 is a light distribution of the left-eye and right-eye image light distribution and horizontal one line at the position Z _1. FIG.
Is the same light distribution at the position Z _2. In the figure, the solid line shows the light distribution for the left eye, and the dotted line shows the light distribution for the right eye.
G1 and G2 indicate areas where crosstalk occurs where the left-eye image and the right-eye image intersect.

As shown, the area where the crosstalk occurs is G1 <G2. In other words, this indicates that the region where crosstalk occurs is increased due to the image formation relationship between the mask 5 and the lenticular lens 8 being disrupted.

At this time, the width of the region where the observer can correctly observe the stereoscopic image is E-G1 in FIG. 13 and E-G1 in FIG.
G2. As described above, the present embodiment detects the position of the observer even when the observer moves in the horizontal direction, corrects crosstalk and reverse stereoscopic vision, follows an appropriate stereoscopic vision area, and observes a stereoscopic image correctly. Let it. By following the observer and presenting the regions E-G1 and E-G2 in FIGS. 13 and 14 to both eyes of the observer, the observer can observe a correct stereoscopic image. That is, in the present embodiment, the focal length fh of each cylindrical lens 8a of the lenticular lens 8 (= the cylindrical lens 8a
Without changing the radius of curvature), the observation region can be enlarged in the front-rear direction. However, assuming that the diameter of the pupil of the observer is Ed, it must be within a range satisfying the condition of E−G2> Ed.

The moving distance Z of the observer and the moving distance C of the lenticular lens 8 are determined by the observer
The direction away from is represented by the following equation from a geometric relationship as shown in FIG.

[0116]

[Equation 23]

The direction in which the observer approaches the display device 1 can be similarly considered. FIG.
Can be expressed by the following equation from the geometrical relationship shown in FIG.

[0118]

(Equation 24)

Equations (9) and (10) differ only in the sign of the observer's moving distance Z and moving distance C. Assuming that Lh1 is the reference for the forward and backward movement of the observer, Lh2 is the reference for the forward and backward movement of the lenticular lens 8, and the direction from the display device 1 toward the observer is the positive direction,
Equations (9) and (10) are the same.

Lh1, Lh2, Hm, and HL are determined when designing to satisfy the equations (1) to (6), respectively, and the equations (9) and (10) are based on the predetermined left eye reference. by measuring the moving distance Z in the longitudinal direction from the position Z _1, shows that the amount to move the lenticular lens 8 in the longitudinal direction C is found.

When the observer moves a distance Z from the display in the front-rear direction, the lenticular lens 8 also moves by the distance C in the same direction as the observer's movement, so that the optimal observation viewing plane is the same as the observer's movement from the display. It is formed at a position shifted by a distance Z in the direction.

In the present embodiment, the lenticular lens 8 is moved by the distance C. However, even if the mask 5 is moved, the optimum observation viewing plane can be moved in the front-rear direction.

FIGS. 15 and 16 show the geometric relationship when the mask 5 is moved in the front-back direction. FIG.
Indicates a state in which the observer moves away from the display device 1, and in this case, the following equation is established.

[0124]

(Equation 25)

FIG. 16 shows the display device 1
. In this case, the following equation is established.

[0126]

(Equation 26)

In the equations (11) and (12), only the sign of the moving distance Z and the moving distance C ′ of the observer is different. Lh1 is used as a reference for movement of the observer in the front-rear direction, and Lh2 is used as a mask 5.
Of the display device 1
If the direction from to the observer is assumed to be the positive direction, equation (11)
And Equation (12) are the same.

Lh1, Lh2, Hm, and HL are determined when designing so as to satisfy the equations (1) to (6), respectively, and the equations (11) and (12) are based on a predetermined left eye reference. by measuring the moving distance Z in the longitudinal direction from the position Z _1, shows that the apparent amount C 'for moving the mask 5 in the front-rear direction.

When the observer moves forward and backward from the display 1 by a distance Z, the optimal observation viewing plane is moved from the display by moving the mask 5 forward and backward by a distance C 'in the opposite direction to the observer's movement. It is formed at a position moved by the distance Z in the same direction as the movement of the observer.

However, also in this case, the distances Lh2 and Lv2 change due to the movement of the mask 5 in the front-rear direction, so that the conditions of the equations (1) and (4) cannot be satisfied. For this reason, the region where crosstalk occurs increases as in the case described above. However, when the width E-G2 of the region where the observer can correctly observe the stereoscopic image satisfies E-G2> Ed as described above,
By presenting the region of E-G2 following both eyes of the observer, the focal length fh of the cylindrical lens 8a (=
The observation region in the front-rear direction can be enlarged without changing the radius of curvature of the cylindrical lens 8a and the focal length fv of the cylindrical lens 9a (= radius of curvature of the cylindrical lens 9a).

FIG. 17 is an explanatory diagram of the first driving means M1 and the second driving means M2 in this embodiment.

The first driving means M1 constitutes an element of a first position changing means for changing a horizontal relative position of at least a part of the light source means and at least a part of the optical means, and a second driving means. M2 constitutes an element of a second position changing means for changing a relative position of at least a part of the light source means and at least a part of the optical means in the front-rear direction. The first and second driving means M1 and M2 are respectively a first position control means for controlling the relative position in the horizontal direction in accordance with an output from the observation position input means, and an output from the observation position input means. Constitutes an element of the second position control means for controlling the relative position in the front-rear direction according to

The first driving means M1 has four sliders S1.
And a drive mechanism K1 and a first position sensor 12.

The slider S1 has a linear bearing 15 which reciprocates linearly along a rail 14 provided on a base substrate 13. In the present embodiment, one end of the linear bearing 15 is attached to two horizontal sides of the mask 5, and the mask 5 is held so as to be able to reciprocate linearly in the horizontal direction (X direction).

The driving mechanism K1 includes a rack gear 16, a pinion gear 17, and a wheel gear 1 provided at one end of the mask.
8, a worm gear 19 and a motor 20. The rotational motion of the motor 20 is reduced and converted into a linear motion and transmitted to the mask 5. The motor 20 is connected to the drive control device 11 and receives a drive signal from the drive control device 11.

The first position sensor 12 is provided at one end of the mask 5, detects the position of the mask 5, and sends the position information to the drive control device 11.

The second driving means M2 has two sliders S2
And a drive mechanism K2 and a second position sensor 21.

The slider S2 is the same as the slider S1 described above.
In the present embodiment, one end of a linear bearing 15 is attached to the lenticular lens 8, and the lenticular lens 8 is held so as to be able to reciprocate linearly in the front-rear direction (Z direction).

The drive mechanism K2 comprises the same components as the drive mechanism K1 described above, and comprises a rack gear 16, a pinion gear 17, a wheel gear 18, a worm gear 19, and a motor 20 provided at one end of the lenticular lens 8. . The rotational motion of the motor 22 is reduced and converted into a linear motion and transmitted to the lenticular lens 8. The motor 22 is connected to the drive control device 11 and receives a drive signal from the drive control device 11.

The second position sensor 21 is provided at one end of the lenticular lens 8, detects the position of the lenticular lens 8, and sends the position information to the drive control device 11.

As shown in FIG. 18, the first position sensor 12 has a mark index 2 for position detection on a part of the mask 5.
3, the mark index 23 and the mark index detector 24 may be formed. The mark index 23 can be formed in the same step as the step of forming the mask pattern 6.

FIG. 19 shows a lenticular lens 8.
Another embodiment of the drive mechanism K2 will be described. The upper and lower ends of the lenticular lens 8 are parallel link members 2
5 and the other end of the parallel link member 25 is
3 is held. By changing the inclination angle θ of the parallel link member 25, the lenticular lens 8 can be moved in the front-rear direction (Z direction). At this time, the lenticular lens 8 is also displaced in the generatrix direction of each of the cylindrical lenses 8a constituting the lenticular lens 8, but has no effect since the generatrix direction is vertical.

Next, the control of this embodiment will be described.

When the position of the observer 101 is at a predetermined reference position (X ₀ , Z ₀ ) in the horizontal direction and the front-back direction,
The observer is set to correctly observe the stereoscopic image. It is assumed that the observer has moved to the position ( _Xt1 , _Zt1 ) at time t1. The position sensor 10 includes an observer 10
1 at the time t1 in the horizontal and previous directions (X _t1 , Z
_t1 ) is detected, and the position information is sent to the drive control device 11.

Further, the first position sensor 12 is in the
The position D of the mask 5 at the previous time t0) _t0And the second place
Position sensor 21 is a wrench of the current state (t0 before following).
Position C of the lens 8_t0Detects these location information
To the drive control device 11.

The drive control device 11 receives the signal from the position sensor 10 and shifts the observer's horizontal direction from a preset reference position (X ₀ , Z ₀ ) in the horizontal direction and the front-rear direction.
X _t1 -X ₀ | and the longitudinal direction of the deviation | Z _t1 -Z ₀ | is calculated,
In the position of the viewer o'clock _{t1 (X t1, Z t1)} , calculates the position C _t1 position D _t1 and the lenticular lens 8 of the mask 5 for forming so as to follow the proper stereoscopic vision region.

The drive control device 11 is provided with a first position sensor.
-12, the position D _t1And position D_t0Compare
And the moving amount of the mask 5 | D_t1-D_t0｜ Calculate the moving direction
And outputs a drive signal to the motor 20 of the first drive means M1.
Power.

[0148] At the same time, the drive control unit 11 receives a signal from the second position sensor 21, by comparing the position C _t0 and the position C _t1, the amount of movement of the lenticular lens 8 | C _t1 -C _t0
| And the moving direction are calculated and the motor 2 of the second driving unit M2 is calculated.
2 to output a drive signal.

The first driving means M1 moves the mask 5 to a desired position _Dt1 , and the second driving means M2 moves the lenticular lens 8 to a desired position _Ct1 . Thereby, the observer at the time t1 corrects the crosstalk on the observation visual plane, follows the appropriate stereoscopic vision area, and allows the observer to correctly observe the stereoscopic image.

By repeating the above-described control process in order of t1, t2,... Tn, the observer can observe a wide observation area.
It is possible to correctly observe a stereoscopic image.

In the present embodiment, the method of driving and controlling the mask 5 in the horizontal direction is used to follow the observer in the left and right direction, and the method of driving and controlling the lenticular lens 8 in the front and rear direction is used for following the front and rear directions. The drive mechanism of each of the lens 5 and the lenticular lens 8 can have a simple structure, and there is no need to use a complicated control system.

The same effect can be obtained by using a method in which only one of the mask 5 and the lenticular lens 8 is driven and controlled in the horizontal and front-back directions to follow the observer in both the left-right and front-back directions. An image display device can be provided. In this case, since only one drive member is required, the number of components can be reduced as compared with the embodiment.

Further, in this embodiment, the optical means is constituted by using the first cylindrical lens array and the second cylindrical lens array, but the toric lens having different focal lengths in the horizontal and vertical directions is used. It is also possible to use a toric lens array arranged two-dimensionally in the horizontal and vertical directions. [Embodiment 2] Fig. 20 is a perspective view of a main part of a stereoscopic image display apparatus according to Embodiment 2 of the present invention.

In the figure, components having the same reference numerals as those in the first embodiment perform the same functions as those in the first embodiment.

In the first embodiment, the light source means is constituted by using the backlight 4, the mask 5 including the checkerboard-shaped openings and the light-shielding portion. In the second embodiment, the light source means is replaced by the second mask. The transmission type display device (spatial modulation element) 26 of the above is used. In this case, the second transmissive display device 26 displays, for example, a checkerboard pattern having openings 6t and light-shielding portions 6s in units of six pixels as shown in FIG. When a checkerboard pattern is formed in units of a plurality of pixels, as described in the conventional example, black stripes are generated by a black matrix having a pixel structure. However, in the second embodiment, as in the first embodiment, the second transmission type display device 26 is driven by the first driving unit M in accordance with the position information of the observer detected by the position sensor 10.
1 controls the movement in the horizontal direction. Therefore, FIG.
Since only the bright part can be presented to the observer while avoiding the dark part shown in (1), the influence of the black stripes caused by the black matrix can be eliminated.

The case where the observer 101 moves in the left-right direction will be described. When a position located near the front of the center of the display device 1 where the observer can observe the stereoscopic image correctly is set as a reference position, and the distance moved in the horizontal direction from this reference position is substantially equal to an even multiple of the inter-eye distance E of the observer. Remain in the state of the reference position. On the other hand, when the distance moved in the horizontal direction from this reference position is substantially equal to an odd multiple of the distance E between the eyes of the observer, the following method is used to correctly follow the movement of the observer in the horizontal direction. It is possible to observe a stereoscopic image. (A-1) The positions of the checkered opening and the light-shielding portion displayed on the second transmissive display device 26 are displayed in reverse video. (A-2) A horizontal stripe composite parallax image LRP as shown in FIG.
Second horizontal stripe composite parallax image LR as shown in FIG.
P is displayed on the display device 1. That is, the left / right relationship of the horizontal stripe pixels of the parallax images for the left and right eyes forming the horizontal stripe composite parallax image is reversed.

FIG. 30 is a vertical sectional view of the stereoscopic display of the present invention, and particularly illustrates the relationship among the display device 1, the second transmissive display device 26, and the lenticular lens 9.

The vertical aperture ratio α _m (α _m <1) of the second transmissive display device 26 and the vertical aperture ratio α _d (α _d <1) of the display device 1 are assumed.

The magnification is set by the lenticular lens 9 so that the vertical pitch Vm of the second transmissive display device 26 becomes Vd at the position of the display device 1.

At this time, the second transmissive display device 26

[0161]

[Equation 27]

In the position of the display device 1,

[0163]

[Equation 28]

Is obtained. Display device 1

[0165]

(Equation 29)

The second transmission type display device 2
At position 6

[0167]

[Equation 30]

Is obtained. Thus, (A-3) the position of the display device 1 is set in the vertical direction.

[0169]

[Equation 31]

Move only. (A-4) The display position of the checkered image on the second transmissive display device 26 is set in the vertical direction.

[0171]

(Equation 32)

Move only

This holds true even if the checkered mask 5 is replaced.

Here, (A-1) to (A-4) are position change means for changing the relative position of the stripe image on the display device and the light source means in the vertical direction, and the observation position input means. This is performed by position control means for controlling the relative position according to the output.

If the observer has moved from the reference position in the horizontal direction but is not an integral multiple of the observer's interocular distance E, the observer smoothly follows the observer's horizontal movement in the same manner as in the first embodiment. It is possible to correctly observe a stereoscopic image.

When the observer moves in the front-rear direction, the observer follows the observer's movement in the front-rear direction by a method similar to that disclosed in Japanese Patent Application Laid-Open No. H10-78563, which is shown in Conventional Example 2. It is possible to correctly observe a stereoscopic image.

In the second embodiment, the light source means constituted by using the backlight 4 and the second transmissive display device 26 is provided with a checkered light emitting portion and a non-light emitting The light emitting pattern may be formed by forming a light emitting pattern. [Embodiment 3] FIG. 24 is a perspective view of a main part of Embodiment 3 of a stereoscopic image display apparatus of the present invention.

In the figure, components having the same reference numerals as those in the first embodiment perform the same functions as those in the first embodiment.

In the first embodiment, the position sensor 10 (observation position detecting means) for detecting the position of the observer is used. In the third embodiment, the observer is operated by a switch input operation instead of the position sensor 10. Uses an observation position setting switch 27 for setting an observation position.

FIG. 25 shows an example of an observation position setting switch (observation position setting means) 27. In this embodiment, there is provided a light projecting section 28a for projecting infrared rays and a light receiving section 28b for receiving infrared rays. An infrared wireless switch 28 is provided. By using an input key 29 for setting the observation position provided on the observation position setting switch 27 and operating the input key 29, the infrared light projecting portion 28a emits light, and this light is received by the infrared light receiving portion 28b. . The input keys 29a, 29b, 29c, and 29d are for setting the observation position to the left, the input key 29a to the left, the input key 29b to the right, the input key 29c to the front, and the input key 29d to the rear. .

The observation position setting switch 27 is connected to the drive control device 11 and the character synthesizing device 30. The character synthesizing device 30 has a first position sensor 1.
2 and the second position sensor 21 are connected. The input to the input key 29 is transmitted to the drive control device 11 and the character synthesizing device 30 by the observation position setting switch 27.
The drive control device 11 receives a signal from the observation position setting switch 27 and outputs a drive signal to the first drive unit M1 and the second drive unit M2. Similarly, the character synthesizing device 30 receives the signal of the observation position setting switch 27, and
A character index 31 for setting an observation position is created and transmitted to a display control unit 32. Upon receiving this signal, the display control unit 32
Displays the character index 31 on the display device 1.

Here, the character synthesizing device 30, the character index 31, and the element control section 32 constitute one element of the index presenting means.

In the third embodiment, the observation position setting switch 27
In response to a switch input operation, the components of the optical system are drive-controlled to set the stereoscopic viewing area at a desired position.

As described in the first embodiment, when the left eye position of the observer shown in FIG. 3 is at the preset left-right reference position X ₁ and front-back reference position Z ₁ , It is assumed that the person has correctly observed the stereoscopic image. If the position of the left eye of the observer deviates from the position X ₁ and the position Z ₁ , as described in the first embodiment, the observer deviates from the appropriate stereoscopic viewing area, and crosstalk and inverse stereoscopic vision generally occur. I cannot see the image.

In this embodiment, crosstalk and reverse stereoscopic vision are corrected by moving the mask 5 or the lenticular lens 8 in the horizontal direction and the front-back direction by a switch input operation to the observation position setting switch 27, and thereby to obtain an appropriate stereoscopic image. A viewing area is set and a stereoscopic image is observed correctly. Mask 5
Alternatively, the principle of changing the stereoscopic viewing area by moving the lenticular lens 8 in the horizontal direction and the front-back direction is the same as in the first embodiment.

The procedure for setting the stereoscopic viewing area of the stereoscopic image display device of the third embodiment to a desired position will be described. About 100mm observer left eye from the reference position X ₁ in the horizontal direction to the left, from the reference position Z ₁ in the longitudinal direction assumed that in the position approximately 100mm forward. (See FIG. 3) The observer operates the input keys 29a,
When any one of 9b, 29c and 29d is input, the switch 28 receives this signal, and the character index 31 is displayed on the display device 1 by the character synthesizing device 30 and the display control unit 32 which have received the signal. .
As the character index 31, for example, at the left and right ends of the image area as shown in FIG. 26, a horizontal stripe combined parallax image LR in which a character “L” is written in the left-eye image and a character “R” is written in the right-eye image is shown. Display on the display device 1. The "L" at this time is a character index 31L,
“R” is a character index 31R.

The character indices 31L and 31R are recognized only by the observer's left eye when the stereoscopic image is correctly observed in the appropriate stereoscopic viewing area, and the character indices 31R are observed by the observer's right eye. Only visible. On the other hand, when it is not possible to correctly observe a stereoscopic image by deviating from an appropriate stereoscopic viewing area, FIGS.
In the region where crosstalk occurs as indicated by G1 and G2, the character indices 31L and 31R are mixed and observed by the left or right eye of the observer and cannot be recognized as the character "L" or "R". Also,
In the reverse stereoscopic viewing area, the character index 31R is visually recognized only by the left eye of the observer, and the character index 31L is visually recognized only by the right eye of the observer. That is, by observing the state of the character indexes 31L and 31R, the observer can determine whether or not the observer is observing in an appropriate stereoscopic viewing area.

At this time, the character synthesizing device 30
27, a scale-like character index 31X that assists in setting a horizontal observation position as shown in FIG. 27, and a scale-like character that assists in setting a front-back observation position as shown in FIG. The index 31Z is displayed on the display device 1.

In the figure, the main scales of the character indices 31X and 31Z indicated by thick lines indicate 100 mm of the observation area, and the auxiliary scales indicated by thin and short lines indicate 10 mm of the observation area. 31Xa is a point index indicating the optimal observation area in the horizontal direction of the stereoscopic image display device of the present invention,
1Za is a point index indicating the optimal observation area in the front-rear direction of the stereoscopic image display device of the present invention. Point index 31X
a is the first position sensor 12, and the point index 31Za is the output signal of the second position sensor 21 by the character synthesizing device 30 and the display control unit 32.
Is displayed.

Here, when the observer is at the preset reference position X _{1 in} the left-right direction and the reference position Z ₁ in the front-rear direction of the left eye in which the observer can correctly observe the stereoscopic image, that is, at E-G 1 in FIG. When a stereoscopic image is correctly observed with the indicated main lobe, the point indices 31Xa and 31Za are set on the central main scale 31X1 of the character index 31X and the central main scale 31Z1 of the character index 31Z. That is, the observer is the character index 31
Point indices 31Xa, 31Z shown on X, 31Z
By observing the state of “a” and comparing it with the current observation position, it can be determined whether or not the observation is performed in an appropriate stereoscopic viewing area.

The observer operates the input key 29a or 29b of the observation position setting switch 27, and
Xa is set to indicate the first main scale to the left from 31X1 of the character index 31X. The drive control unit 11 by the input signal at this time outputs a drive signal to the first drive means M1, the position indicated by the point indicators 31Xa offset approximately 100mm leftward horizontal viewing area from the position X ₁ of the left eye The drive of the mask 5 is controlled so as to move.

Similarly, by operating the input key 29c or 29d, the point index 31Za is changed to the character index 31Z.
Is set so as to show the first main scale upward from 31Z1. The drive control unit 11 by the input signal at this time outputs a drive signal to the second drive means M2, moved to the position indicated by the point indicators 31Za offset about 100mm in front is the front-rear direction of the observation area from the position Z ₁ of the left eye The lenticular lens 8 is driven and controlled so as to perform the operation.

[0193] observation area of the left eye of the observer by such operation of about 100mm from the position X ₁ to the left, is roughly adjusted from the position Z ₁ to the position of approximately 100mm forward.

Next, the observation area of the left eye of the observer is finely adjusted. Wider than the horizontal viewing area towards the longitudinal direction of the observation region is at a position Z ₁ or position Z ₂ in the longitudinal direction of the left eye as shown in FIG. 12. That is, in the stereoscopic image display device of the present invention, the allowable movement amount in the front-rear direction is larger than the allowable movement amount in the horizontal direction. For this reason, the fine adjustment adjusts the observation region in the horizontal direction where the movement allowance is small. The observer operates the input key 29a or 29b, and finely adjusts so that the character index 31L can be visually recognized only with the left eye and the character index 31R can be visually recognized only with the right eye. At this time, since the infrared wireless switch 28 is used as the observation position setting switch 27, the observer can remotely operate the input keys 29a or 29b from the observation position while watching the character indicators 31L and 31R at the observation position.

Here, the input keys 29a, 29b of the infrared wireless switch 28 constitute one element of the remote input operation means.

Similarly to the above, the drive of the mask 5 is controlled by the input signal at this time, and an appropriate stereoscopic viewing area is presented.

In this embodiment, the infrared wireless switch 28 is used. However, remote control is performed using another wireless switch or a wired switch having a length capable of connecting the observation position and the stereoscopic image display device of the present invention. You may do it.

In the third embodiment, the switch 5 is operated to control the mask 5 and the lenticular lens 8 as components of the optical system to set the stereoscopic viewing area to a desired position by the switch input operation to the observation position setting switch 27 described above. I have to.

Thus, in the present embodiment, it is possible to correct the crosstalk on the observation viewing plane of the observer and present an appropriate stereoscopic viewing area without using the position sensor 10 for detecting the position of the observer. Is possible. For this reason, the observer can observe a stereoscopic image correctly in a wide observation area. [Embodiment 4] FIG. 28 is a perspective view of a main part of a stereoscopic image display apparatus according to Embodiment 4 of the present invention.

In the figure, components having the same numbers as in the third embodiment perform the same functions as those in the third embodiment.

In the third embodiment, the observation position setting switch 27 for setting the observation position by a switch input operation is used. In the fourth embodiment, a horizontal position for detecting the position of the observer in the horizontal direction (left and right direction) is used. An observation position setting switch 34 for setting an observation position in the front-back direction by a position sensor 33 and a switch input operation is provided.

There have conventionally been many proposals for a method of detecting the observer's horizontal position. In this embodiment, various methods capable of detecting the observer's horizontal position can be used. For example, a method is used in which an image of the observer is photographed with a TV camera, and the center position of the observer's face is obtained by image processing. The observation position setting switch 34 is provided with a lever that can be tilted up and down, and the observation position in the front-rear direction is set by this lever tilting operation.

[0203] The horizontal position sensor 33 is
It is connected to the. The signal of the horizontal position sensor 33 is transmitted to the drive control device 11, and the drive control device 11 receives this signal and outputs a drive signal to the first drive means M1.

The observation position setting switch 34 is connected to the drive control device 11 and the character synthesizing device 30. The character synthesizing device 30 includes a second position sensor 2.
1 is connected. The input to the observation position setting switch 34 is transmitted to the drive control device 11 and the character synthesizing device 30. The drive control device 11 includes the observation position setting switch 3
4 to output a drive signal to the second drive means M2. Similarly, the character synthesizing device 30 receives the signal from the observation position setting switch 34, creates a character index 31 for setting the observation position, and transmits the character index 31 to the display control unit 32. Upon receiving this signal, the display control unit 32 displays the character index 31 on the display device 1. Here, in the fourth embodiment, only the character index 31Z in the front-back direction is displayed on the display device 1.

As described in the third embodiment, in the stereoscopic image display device of the present invention, the allowable movement amount in the front-rear direction is larger than the allowable movement amount in the horizontal direction. In the fourth embodiment, the horizontal observation area having a small allowable movement amount is set by the horizontal position sensor 33, and the observation area in the front-rear direction having a large allowable movement amount is set by a switch input operation to the observation position setting switch 34. The components of the system are drive-controlled to set the stereoscopic viewing area at a desired position.

For setting the observation area in the horizontal direction of the observer, the observer's position signal from the horizontal position sensor 33 is transmitted to the drive control device 11, and the following procedure is performed in the same manner as described in the first embodiment. The observation region in the direction is set so as to follow the position of the observer.

For setting the observation area in the front-back direction of the observer, the observer operates the lever of the observation position setting switch 34, and the point index 31Za is changed to the character index 31Z.
Is set to indicate the scale of the desired observation position from 31Z1. In response to the input signal at this time, the drive control device 11 outputs a drive signal to the second drive unit M2, and controls the drive of the lenticular lens 8 so that the observation region in the front-rear direction of the left eye moves to the position indicated by the point index 31Za. . With this operation, the observation region in the front-back direction of the left eye of the observer is adjusted.

As described above, in the fourth embodiment, the horizontal observation area is set by the horizontal position sensor (observation position detecting means) 33, and the observation position setting switch (observation position setting means) 3 is set.
The mask 5 and the lenticular lens 8 are set so that the observation area in the front-back direction is set by a switch input operation to the switch 4.
Is controlled to set the stereoscopic viewing area at a desired position.

As a result, in the present embodiment, it is possible to correct the crosstalk on the observation viewing plane of the observer and present an appropriate stereoscopic viewing area. For this reason, the observer can observe a stereoscopic image correctly in a wide observation area.

As described above, Embodiments 1 and 2
In, the stereoscopic observation area can be presented smoothly following the movement of the observer in the front-rear direction and the left-right direction, so that the observation position does not need to be fixed, and the observation area can be enlarged in the front-rear and left-right directions. Moreover, there is no influence of the black matrix, and the first lenticular lens is made of a lens having a constant radius of curvature that can be manufactured with high precision, so that the image quality is good.

[0211] Further, tracking in the left-right direction can be performed by controlling the movement of the mask, and tracking in the front-rear direction can be performed by controlling the movement of the first lenticular lens. Since the moving objects are individually moved in this manner, control is easy. Alternatively, the first lenticular lens (or mask)
Only the movement can be controlled. In this case, only one moving object is required, and the mounting of the optical system can be simplified, and the number of components constituting the driving unit can be reduced.

In the third embodiment, since the stereoscopic observation area can be set according to the position of the observer in the front-rear direction and the left-right direction, the observation area can be enlarged in the front-rear and left-right directions.
In addition, since the first lenticular lens is not affected by the black matrix and is constituted by a lens having a constant radius of curvature that can be manufactured with high accuracy, the image quality is good.

Further, since an expensive observer position detection sensor is not used, the stereoscopic image display device having the above-described effects can be manufactured at a low cost.

In the fourth embodiment, the stereoscopic observation area can be set according to the position of the observer in the front-back direction, and the stereoscopic observation area can be presented smoothly following the observer's left-right movement. Therefore, the observation position in the left-right direction does not need to be fixed, and the observation region can be enlarged in the front-rear, left-right direction. In addition, there is no influence of the black matrix,
Since the lenticular lens is made of a lens having a constant radius of curvature that can be manufactured with high precision, the image quality is good.

Further, since the setting of the observation area in the front-back direction with a large permissible movement amount is performed by the switch input operation, an expensive observer position detection sensor is not used. The image display device can be made inexpensive.

[0216]

According to the present invention, a stereoscopic observation area in which a stereoscopic image can be observed in the left-right and front-to-rear directions while smoothly following the observer's observation position is enlarged, and a high-quality stereoscopic image free from the influence of the black matrix is obtained. A stereoscopic image display device capable of observing an image can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a stereoscopic image display device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an image displayed on a display device.

FIG. 3 is a configuration perspective view of a stereoscopic image display device according to the present invention.

FIG. 4 is a diagram illustrating an optical action in the horizontal direction of the illumination optical system in FIG. 1;

FIG. 5 is a diagram illustrating an optical function of the illumination optical system in FIG. 1 in a vertical direction.

FIG. 6 is a diagram illustrating the optical function of the illumination optical system in FIG. 1 in the vertical direction.

FIG. 7 is a diagram illustrating the optical function of the illumination optical system of FIG. 1 in the vertical direction.

8 is a cross-sectional view on a horizontal plane passing through a horizontal stripe pixel L (2n-1) in FIG.

FIG. 9 is an explanatory diagram of an observation region in the front-rear direction in FIG. 1;

FIG. 10 is an explanatory diagram of a geometric relationship when the lenticular lens 8 of FIG. 1 is moved.

11 is an explanatory diagram of a geometric relationship when the lenticular lens 8 of FIG. 1 is moved.

FIG. 12 is an explanatory diagram of an observation region in the front-back direction of observation.

FIG. 13 is an explanatory diagram of light distribution on an observation visual plane.

FIG. 14 is an explanatory diagram of light distribution on an observation viewing plane.

FIG. 15 is an explanatory diagram of a geometric relationship when the checkered mask 5 is moved.

FIG. 16 is an explanatory diagram of a geometric relationship when the checkered mask 5 is moved.

FIG. 17 shows a first driving unit M1 and a second driving unit M2.
Illustration of

FIG. 18 is an explanatory diagram of another embodiment of the first position sensor 12.

FIG. 19 is an explanatory view of another embodiment of the drive mechanism K2.

FIG. 20 is a perspective view of a main part of a stereoscopic image display device according to a second embodiment of the present invention.

FIG. 21 is an explanatory diagram of the checkered pattern in FIG. 20;

FIG. 22 is an explanatory view of a black stripe by a black matrix.

FIG. 23 is an explanatory diagram of a second horizontal stripe composite parallax image.

FIG. 24 is a perspective view of a main part of a stereoscopic image display device according to a third embodiment of the present invention.

FIG. 25 is an explanatory diagram of an example of an observation position setting switch 27.

FIG. 26 is an explanatory diagram of character indices 31L and 31R.

FIG. 27 is an explanatory diagram of character indices 31X and 31Z.

FIG. 28 is a perspective view of a main part of a stereoscopic image display device according to a fourth embodiment of the present invention.

FIG. 29 is an explanatory diagram of a conventional stereoscopic image display device.

FIG. 30 is an explanatory view in the vertical direction of the stereoscopic display according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 display device 2 display pixel portion 3 glass substrate 4 backlight 5 mask 6 mask pattern 7 mask substrate 8 first lenticular lens 9 second lenticular lens 10 position sensor 11 drive controller 12 first position sensor 13 base substrate 13 14 Rail 15 linear bearing 16 rack gear 17 pinion gear 18 wheel gear 19 worm gear 20 motor 21 second position sensor 22 motor 23 mark index 24 mark index detector 25 parallel link member 26 second transmission type display device 27 observation position setting switch 28 infrared wireless Switch 29 Input key 30 Character synthesizer 31 Character index 32 Display controller 33 Horizontal position sensor 34 Observation position setting switch

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[Procedure amendment]

[Submission date] April 13, 2001 (2001.4.1)
3)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 13/04 H04N 13/04 (72) Inventor Tsutomu Osaka 6-145 Hanasaki-cho, Nishi-ku, Yokohama-shi, Kanagawa Stock F-term (reference) in MIR Systems Research Laboratories 2H059 AA21 AB13 5C061 AA06 AA11 AB12 AB16 AB17 AB24

Claims (23)

[Claims] 1. A light source unit, an optical unit having different optical functions in a horizontal direction and a vertical direction, and a transmissive display device, wherein the display device has a parallax image for the left eye and a parallax for the right eye. A left stripe pixel and a right stripe pixel obtained by dividing each of the images into a plurality of stripe pixels are alternately arranged in a predetermined order to display a stripe composite image as one image, and a light beam emitted from the light source means. After giving the directivity by the optical means, the left or right stripe pixels displayed on the display device are transmitted and separated into different areas, respectively, in a three-dimensional image display device that allows a viewer to visually recognize a three-dimensional image. A second position changing unit that changes a relative position of at least a part of the light source unit and at least a part of the optical unit in the front-rear direction. 3D image display device. 2. The three-dimensional object according to claim 1, further comprising first position changing means for changing a horizontal relative position of at least a part of said light source means and at least a part of said optical means. Image display device. 3. A light source means, optical means having different optical actions in horizontal and vertical directions, and a transmissive display device, wherein the display device has a parallax image for the left eye and a parallax for the right eye. A left stripe pixel and a right stripe pixel obtained by dividing each of the images into a plurality of stripe pixels are alternately arranged in a predetermined order to display a stripe composite image as one image, and a light beam emitted from the light source means. After giving the directivity by the optical means, the left or right stripe pixel displayed on the display device is transmitted and separated into different areas to allow a viewer to visually recognize a three-dimensional image. Observation position input means for inputting observation position information of a person, and relative positions of at least a part of the light source means and at least a part of the optical means in the front-rear direction A second position changing unit for changing the relative position in the front-rear direction according to an output from the observation position input unit. Image display device. 4. A first position changing means for changing a horizontal relative position of at least a part of said light source means and at least a part of said optical means, and said horizontal position according to an output from said observation position input means. The three-dimensional image display device according to claim 3, further comprising first position control means for controlling a relative position in the direction. 5. A light source means, optical means having different optical actions in horizontal and vertical directions, and a transmissive display device, wherein the display device has a parallax image for the left eye and a parallax for the right eye. A left stripe pixel and a right stripe pixel obtained by dividing each of the images into a plurality of stripe pixels are alternately arranged in a predetermined order to display a stripe composite image as one image, and a light beam emitted from the light source means. A stereoscopic image display device which transmits the left or right stripe pixels displayed on the display device and separates the pixels into different regions so that a stereoscopic image can be visually recognized by an observer. A three-dimensional object comprising: a position changing unit that changes a vertical relative position between the stripe image on the device and the light source unit. Image display device. 6. An observation position input means for inputting observation position information of an observer, and position control means for controlling the relative position according to an output from the observation position input means. 6. The three-dimensional image display according to claim 5, wherein: 7. The optical means includes a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction, and a second cylindrical lens in which a plurality of horizontally long cylindrical lenses are arranged in a vertical direction. The three-dimensional image display device according to claim 1, further comprising an array. 8. The light source means is configured to illuminate a mask substrate or a spatial light modulator having a checkerboard-shaped opening and a light-shielding portion with a surface light source, or to provide a checkerboard on a light-emitting surface of a self-luminous display element. And a pair of horizontal pitches of the checkerboard pattern of the light source means is formed corresponding to a horizontal pitch of the first cylindrical lens array. The striped composite image is obtained by dividing each of the left-eye parallax image and the right-eye parallax image into a plurality of stripe-shaped pixels in the horizontal direction, and alternately obtains respective stripe pixels in a predetermined order. 8. The three-dimensional image display device according to claim 7, wherein the three-dimensional image display device comprises a horizontal stripe image arranged as one image in the vertical direction. 9. The left and right stripe pixels constituting the horizontal stripe image are one of the display devices.
9. The three-dimensional image display device according to claim 8, wherein the display is performed alternately for each scanning line. 10. A vertical pitch of the second cylindrical lens array is formed corresponding to a pair of vertical pitches of the checkerboard pattern of the light source means and a pitch of each stripe pixel forming the horizontal stripe image. The three-dimensional image display device according to claim 7, wherein: 11. The observation position input unit includes at least one of an observation position detection unit for detecting observation position information of the observer and an observation position setting unit for setting observation position information. The three-dimensional image display device according to claim 3, wherein the three-dimensional image display device has: 12. The stereoscopic image according to claim 11, further comprising an index presenting unit that presents an auxiliary index for setting the observation position by the observer in accordance with an output from the observation position setting unit. Display device. 13. The observation position setting means includes remote input operation means for performing an input operation for setting an observation position by remote control from the observation position at a predetermined distance from the stereoscopic image display device. The stereoscopic image display device according to claim 11, wherein: 14. The observation position detection means detects a horizontal position of the observer, and the observation position setting means sets the position of the observer in the front-back direction of observation. 3. The stereoscopic image display device according to claim 1. 15. The three-dimensional image display device according to claim 8, wherein a mark index for detecting the position of the mask substrate is provided on the mask substrate on which the openings of the checkerboard pattern and the light shielding portions are formed. . 16. The three-dimensional image display device according to claim 7, wherein said first position changing means changes a horizontal position of said light source means or said first cylindrical lens array. 17. The optical means includes a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction, and a second cylindrical lens in which a plurality of horizontally long cylindrical lenses are arranged in a vertical direction. 7. An array according to claim 1, wherein the second position changing unit changes a position of the light source unit or the first cylindrical lens array in a front-rear direction. 8. Stereoscopic image display device. 18. The three-dimensional image display device according to claim 17, wherein the position of the first cylindrical lens in the generatrix direction and the position in the front-rear direction are changed by a parallel link mechanism. 19. The optical means includes a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction, and a second cylindrical lens in which a plurality of horizontally long cylindrical lenses are arranged in a vertical direction. An array, wherein the first position changing means changes the horizontal position of the light source means,
The second position changing means changes the position of the first cylindrical lens array in the front-rear direction, or the first position changing means and the second position changing means change the light source means or the first position changing means. The stereoscopic image display device according to any one of claims 1 to 6, wherein the positions of the cylindrical lens array in the horizontal direction and the front-back direction are changed. 20. The light source means has a first cylindrical lens array formed by arranging a plurality of vertically long cylindrical lenses in a horizontal direction, and the light source means is a mask substrate having a checkered opening and a light shielding part. Alternatively, the spatial light modulator is configured to be illuminated by a surface light source, or a self-luminous display element is formed by forming a light emitting pattern including a checkered light emitting portion and a non-light emitting portion on a light emitting surface, A pair of horizontal pitches of the checkered pattern are formed corresponding to the horizontal pitch of the first cylindrical lens array, and the observer moves in a horizontal direction from a reference position where a stereoscopic image can be visually recognized correctly. X, the distance in air between the observer and the first cylindrical lens array at the reference position is Lh1, and the light source distance at the reference position is Lh1. The air-equivalent distance between the step and the first cylindrical lens array is Lh2, the horizontal pitch of the openings or light-shielding portions of the checkerboard pattern of the light source means is Hm, and the horizontal pitch of the cylindrical lenses of the first cylindrical lens array is Hm. When the pitch in the direction is HL, the light source means is shifted in the horizontal direction from the position when the observer is at the reference position. Moving in the direction opposite to the direction in which the observer has moved by the distance D represented by, or moving the first cylindrical lens array in the horizontal direction from a position where the observer is at the reference position. The stereoscopic image display device according to claim 2, wherein the stereoscopic image display device moves in the same direction as the direction in which the observer has moved by D. 21. The optical means has a first cylindrical lens array in which a plurality of vertically long cylindrical lenses are arranged in a horizontal direction, and the optical means extends in a front-rear direction from a reference position where the observer can correctly view a stereoscopic image. Assuming that the moved distance is Z, when the observer moves the first cylindrical lens array in the front-back direction away from the display device from the position where the observer is at the reference position, ] If the observer moves in a direction approaching the display device, Move in the same direction as the direction in which the observer moves by the distance C1 represented by. Alternatively, when the observer moves the light source means in the front-back direction away from the display device when the observer is at the reference position, If the observer moves in a direction approaching the display device, The stereoscopic image display device according to claim 1, wherein the observer moves in a direction opposite to a direction in which the observer moves by a distance C2 represented by: 22. The apparatus according to claim 5, wherein said position changing means changes a vertical relative position between said display device and said light source means by a mechanical drive mechanism.
Or the stereoscopic image display device according to 6. 23. The distance between the eyes of the observer is E, the vertical pixel pitch of the display device is Vd, the vertical pitch of the checkerboard pattern opening or light-shielding portion of the light source means is Vm, If the distance that the observer correctly moves in the horizontal direction from the reference position where the stereoscopic image can be visually recognized is substantially equal to an odd multiple of the interocular distance E, the horizontal stripe image is formed when the observer is at the reference position. Inverting the horizontal relationship between the left and right horizontal stripe pixels, or moving the display device in the vertical direction from the position where the observer is at the reference position. Or the light source means is moved more vertically than the position when the observer is at the reference position. 23. The method according to claim 22, wherein when the observer is at the reference position, the positional relationship between the checkered opening of the light source means and the light-shielding part or the light-emitting part and the non-light-emitting part is reversed. 3. The stereoscopic image display device according to 1.