JP2013161035A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a picture display device that allows a joint of the element lens to be made inconspicuous in picture display devices using a lens array with an element lens arranged in a two-dimensional array form.SOLUTION: The picture display device comprises: (1) a light-emitting device that can adust light-emitting intensity, respectively and consists of a plurality of luminescent points; (2) a light collection element group that is disposed between the light-emitting device and a viewer, regularly arrayed in longitudinally and laterally in a two-dimensional planar or a two-dimensional curve shape and in which a lateral array direction is substantially parallel with a direction connecting a right eye of the viewer and a left eye thereof; (3) a light modulation element group that is disposed between the light collection group and the viewer and modulates light from the light-emitting device; and (4) a diffuser that diffuses light between the light collection element group and the viewer. Particularly, an array of the light collection element group has a predetermined period in the respective lateral rows, but in an arbitrary lateral row, the array has a different phase from lateral rows above and below the arbitrary lateral row. The diffuser diffuses the light more in a longitudinal direction in comparison with the lateral direction, and controls the light modulation element group to display a picture.

Description

  The present invention relates to an image display device that suppresses the conspicuous seam between element lenses in multi-view imaging using a lens array including a plurality of element lenses.

  Main stereoscopic video display devices include binocular parallax using binocular parallax, multi-view (or super multi-view) that can be viewed from many viewpoints, and integral photography (hereinafter referred to as IP). However, the present invention relates to a multi-view 3D image display apparatus.

  The binocular system gives a pair of stereoscopic images to the right eye and the left eye. 2. Description of the Related Art A twin-lens system that uses glasses for separating a displayed image into a right eye and a left eye is becoming popular in movies and televisions. It is well known that the disadvantage of this method is that there is a contradiction between eye convergence and accommodation, and it gives the observer a feeling of fatigue.

  In addition, in order to alleviate the disadvantage of the multi-view type (or super multi-view type) that the stereoscopic view (hereinafter referred to as viewpoint) is limited in the above-described two-lens type, images from many viewpoints are prepared. They are presented to the observers at each viewpoint.

  Japanese Patent Application Laid-Open No. 7-38926 discloses a three-dimensional display device using a lenticular lens that allows an observer to observe different parallax images as they move. This three-dimensional display device is a three-dimensional display device having a display panel on which a plurality of different parallax images are simultaneously displayed, and a lenticular lens composed of an array of cylindrical lenses. A plurality of three-dimensional signals based on a head position detected by the head detecting device; a plurality of three-dimensional signal sources that output a three-dimensional signal for performing multi-view display; And a three-dimensional signal selection device that selects a three-dimensional signal output from the source. In addition, the two signals selected by the three-dimensional signal selection device are divided into even and odd fields, respectively, and a three-dimensional signal synthesis is performed in which a left-eye parallax image and a right-eye parallax image are alternately displayed on a liquid crystal panel for each line. A device is provided.

  Patent Document 2 (Japanese Patent Laid-Open No. 8-160356) discloses a stereoscopic video display device that controls a light emitting portion of a backlight light source. In this stereoscopic image display apparatus, imaging means or imaging means configured in an array shape is arranged to output a stereoscopic image, and at the rear of the observer's face image is substantially formed or in the vicinity thereof. In order to distribute the left-eye and right-eye stereo images in a time-division manner to the left and right eyes of the observer, a backlight source capable of outputting an image is provided, and the observer and the imaging means or the array are configured. A transparent electro-optic spatial modulation element group capable of displaying a stereo image to be observed by the observer in a time-sharing manner is disposed between the imaging means and the observer's image or infrared image. An image is taken through the imaging means or the imaging means configured in an array, and the obtained modulated image of the observer image is displayed on the backlight light source. As a backlight light source in this disclosure, a monochrome liquid crystal television is used as an image output capable of distributing a correct stereo image to the left and right eyes of an observer in a spatial division. In addition, as the spatial modulation element group, a color liquid crystal television capable of outputting an image to distribute right stereo images to the left and right eyes of the observer in a time division manner is used.

JP 7-38926 A JP-A-8-160356

In a conventional video display device, particularly in a video display device using a lens array in which element lenses are arranged in a two-dimensional array, the joint of the element lenses is conspicuous. For this reason, an image display device in which this joint is not conspicuous is desired.

The video display device of the present invention is a video display device using a lens array composed of a plurality of element lenses, (1) a light emitter composed of a plurality of bright spots each capable of adjusting the light emission intensity, and (2) It is installed between the light emitter and the observer and is regularly arranged vertically and horizontally in a two-dimensional plane or two-dimensional curved surface, and the horizontal arrangement direction is substantially parallel to the direction connecting the right eye and the left eye of the observer. (3) a light modulation element group that is installed between the light collection element group and the observer and modulates light from the light emitter; and (4) the light collection element group. And a diffuser for diffusing light between the viewer and the viewer.
In particular, in the arrangement of the light collecting element groups, each horizontal arrangement has a predetermined period, but an arbitrary horizontal arrangement is an arrangement having a different phase from the upper or lower horizontal arrangement. The diffuser is a diffuser that diffuses in the vertical direction as compared to the horizontal direction, and controls the image by controlling the light modulation element group.
This alleviates the conspicuous seams between the element lenses in the vertical direction as viewed from the observer. The period or phase in the above description relates to a spatial arrangement, the period is the reciprocal of the spatial frequency, and the phase indicates a deviation of the arrangement having the period.

The light emitting element group alternately emits light at different positions, and in synchronization therewith, the light modulation element group alternately displays a right-eye image and a left-eye image for fusing a stereoscopic image to an observer. At this time, the light emitter changes the light emission region of the bright spot for each left eye and right eye, and the light modulation element group modulates the light from the light emitter for each left eye and right eye.

The diffuser is a diffusion plate in which a plurality of micro lenses are arranged in a plane or curved surface. This microlens is not isotropic with respect to the optical axis like a spherical lens, but has anisotropy like a cylindrical lens.

The light from the light emitter includes light of a plurality of hues, and includes a color filter element group that selects light of a hue that is transmitted from light irradiated on each modulation element of the light modulation element group. Is. The plurality of hues indicate hues used as primary colors for mixing in color display.

The arbitrary lateral arrangement of the light collecting element group has a predetermined phase difference from the upper or lower arrangement. Here, it is not necessary to limit the phase difference to be constant.

The light emitting device includes a controller that controls the position of the light emitting region according to the position of the viewer so that light from the light emitting region reaches the left eye and the right eye of the viewer. This control can also be performed by adjusting the light emission intensity in addition to the size, shape or position of the light emitting region of the light emitter.

  The light coming from the joint portion of the lens and the light coming from the center portion are blended, and an image with uniform brightness can be observed. Further, regarding stereoscopic viewing, limiting the diffusion only to the vertical direction does not affect the distribution of the backlight in the left-right direction, so that stereoscopic viewing can also be maintained.

(A) is a display for the right eye, and (b) is a view for the left eye for display by the video display device of the present invention. The backlight 1, which is a light emitter, includes a plurality of bright spots, each of which can adjust the light emission intensity. Here, the bright spot means a point-like region that can output light. The lens array 2 that is a condensing element group is installed between the backlight 1 and the observer 5. In this example, a plurality of element lenses 6 as light condensing elements are regularly arranged in a two-dimensional plane or a two-dimensional curved surface in the vertical and horizontal directions. A liquid crystal panel 4 as a light modulation element group is installed between the light collection element group and the observer, and modulates light from the light emitter. Near the liquid crystal panel 4 between the liquid crystal panel 4 and the observer 6 or between the lens array 2 and the liquid crystal panel 4, a diffusion plate 3 that is a diffuser for diffusing light is provided. The condensing element group is a diagram showing that a plurality of element lenses 6 that are condensing elements are regularly arranged vertically and horizontally on a two-dimensional plane or a two-dimensional curved surface. Here, it is a figure which shows the example of the lens array which used the lenticular lens for the element lens. An example is shown in which the optical path from the backlight 1 to the lens array 2 is partitioned by a double-sided mirror. As a result, the light source is stretched in the vertical direction as viewed from the observer while blocking the light leaking up and down. A configuration in which the directional backlight is controlled to emit light only in the right eye direction and the left eye direction by constantly grasping the three-dimensional positions of both eyes of the observer by using the video camera 7 and the controller 10 for analyzing the position of the observer. FIG.

  In general, the present invention is a video display device using a lens array in which element lenses are arranged in a two-dimensional array, and light is mainly emitted only in the vertical direction between the lens array and a liquid crystal panel that performs spatial modulation. A directional diffuser plate for diffusion is provided. The lens array is, for example, a convex lens array in which hexagonal lenses are arranged in a delta arrangement, and the spatial frequency of the horizontal arrangement in the arrangement has a predetermined value, but the phase is different from that of the upper or lower arrangement. . The present invention improves the problems in the prior art by adopting the arrangement of the lens array and the directional diffuser.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description, devices having the same function or similar functions are denoted by the same reference numerals unless there is a special reason.

The video display device of the present invention can be used as an autostereoscopic video display device or a normal two-dimensional display device, but is a video display device using a condensing element group composed of a plurality of element lenses. . Regarding the display by the video display device of the present invention, FIG. 1A shows the display for the right eye, and FIG. 1B shows the display for the left eye. The backlight 1, which is a light emitter, includes a plurality of bright spots, each of which can adjust the light emission intensity. Here, the bright spot means a point-like region that can output light. The lens array 2 that is a condensing element group is installed between the backlight 1 and the observer 5. For example, as shown in FIG. 2, a plurality of element lenses 6 that are light condensing elements are regularly arranged vertically and horizontally in a two-dimensional plane or a two-dimensional curved surface. Furthermore, it is possible to improve visibility by inserting a large-diameter convex lens in front of the lens array surface and optimizing the uniformity of the brightness of the screen viewed from each viewpoint. In the lens array 2, the horizontal arrangement direction is substantially parallel to the direction connecting the right eye and the left eye of the observer. A liquid crystal panel 4 as a light modulation element group is installed between the light collection element group and the observer, and modulates light from the light emitter. Further, a diffusion plate 3 that is a diffuser for diffusing light is provided between the liquid crystal panel 4 and the observer 6 or near the liquid crystal panel 4 between the lens array 2 and the liquid crystal panel 4. .
In particular, in the arrangement of the lens array 2 as the light condensing element group, each horizontal arrangement has a predetermined spatial period, but an arbitrary horizontal arrangement has a spatially different phase from an upper or lower horizontal arrangement. It is an array with. Further, the diffusion plate 3 as the diffuser diffuses more widely in the vertical direction than in the horizontal direction. The controller 10 controls the image display by controlling the light emission position in the backlight 1 and the liquid crystal panel 4.

  In the example shown in FIG. 1, a convex lens array is used as the lens array 2, and the backlight emits light at a position where a straight line connecting the left and right eyes and the center of each element lens of the lens array 2 intersects the backlight 1. Thereby, a directional backlight in which light reaches only in the direction of each eye is realized. In this method, a change in the standing position of the observer in the depth direction can be dealt with by changing the interval between the light emitting portions, and it is not necessary to control the physical optical distance. Further, since the distance between the lens array 2 and the backlight 1 is substantially equal to the focal length of the element lens 6 of the lens array 2, the use of an element lens 6 having a short focal length can reduce the thickness of the apparatus. Is possible.

  In the configuration example shown in FIG. 4, the optical path from the backlight 1 to the lens array 2 is partitioned by a double-sided mirror. As a result, the light source is stretched in the vertical direction as viewed from the observer while blocking the light leaking up and down.

  As the lens array 2, for example, as shown in FIG. 2, a convex lens array (fly eye lens) in which hexagonal lenses are arranged in a delta arrangement is used. Here, it is also possible in principle to use a lenticular lens for the element lens as a lens array, and an example thereof is shown in FIG.

  In this case, since the joints of the element lenses are conspicuous, a delta-arranged lens array is used, but a directional diffuser plate that diffuses light mainly in the vertical (vertical) direction is inserted on the back side of the liquid crystal panel. Lateral diffusion is permissible as long as it is slight compared to the vertical direction. As a result, the light coming from the joint portion of the lens and the light coming from the center portion are blended, and the observer 6 can observe an image with uniform luminance. For example, the diffusion plate is formed by arranging a plurality of microlenses in a plane or curved surface. However, this microlens is not isotropic with respect to the optical axis like a spherical lens, but has anisotropy like a cylindrical lens. It may be a set of minute lenticular lenses having an infinite lateral focal length. In addition, limiting the main diffusion only to the vertical direction does not affect the left / right distribution of the backlight, so that the stereoscopic view can be maintained.

  When the directional diffuser is sufficiently thin, it can be disposed on the front side of the liquid crystal panel, and in that case, an antiglare effect can be provided. However, since a normal anti-glare film has light diffusion in the horizontal direction, it cannot be applied to the present invention.

  In an environment where the observer's observation position is assumed to be close to the display, if a large-diameter convex lens having a focal length close to the distance between the display and the observer is inserted between the lens array and the diffuser, the observer's It is easy to sort images to the right eye and left eye.

  When there are multiple observers, the backlight position corresponding to the right eye and the left eye is caused to emit light in a broad sense at all places where the straight line connecting the eyes of each observer and the center of the element lens intersects the backlight. It becomes possible for the observer to simultaneously perform autostereoscopic viewing.

  In this method, since the portion of the backlight that emits light is significantly narrowed, if a self-luminous dot matrix backlight is used, significant power saving can be expected. The power saving effect increases as the number of observers is small and the light emitting area is narrow.

  The display for the right eye and the display for the left eye shown in FIGS. 1A and 1B can be alternately performed in a time division manner. At this time, the light emitter changes the light emission region of the bright spot for each left eye and right eye, and the light modulation element group modulates the light from the light emitter for each left eye and right eye.

  If the time division between the backlight and the image display is cut off, a normal two-dimensional image can be observed on this monitor. At that time, if control is performed so that the directional backlight emits light only in the right-eye and left-eye directions, it functions as a power-saving two-dimensional television. In this method, it is desirable to always keep track of the three-dimensional positions of both eyes of the observer. As a position sensor for this purpose, a method of forcing an observer to attach the sensor, such as a well-known magnetic three-dimensional sensor, has the highest reliability. However, when considering consumer electronics applications such as television broadcast reception, a method that eliminates the need for sensor mounting is desirable. As an example of this, as shown in FIGS. 5A and 5B, a computer vision method using a video camera 7 and a controller 10 for analyzing the position of an observer, or Microsoft's kinect (registered trademark). ) A sensor can be used.

  Even when a pinhole group is used instead of the fly-eye lens, it is obvious that the number of pixels can be easily increased or reduced as in the first embodiment. In addition, the present invention can be applied to a parallax barrier system as in the lenticular lens system.

DESCRIPTION OF SYMBOLS 1 Backlight 2 Lens array 3 Diffuser plate 4 Liquid crystal panel 5 Observer 6 Element lens 7 Video camera

Claims (6)

An image display device using a lens array composed of a plurality of element lenses,
A light emitter composed of a plurality of bright spots each capable of adjusting the light emission intensity;
It is installed between the light emitter and the observer and is regularly arranged vertically and horizontally in a two-dimensional plane or two-dimensional curved surface, and the horizontal arrangement direction is substantially parallel to the direction connecting the right eye and the left eye of the observer. A condensing element group,
A light modulation element group that is installed between the light collecting element group and the observer, and modulates light from the light emitter;
A diffuser for diffusing light between the light collecting element group and an observer,
The arrangement of the light collecting element groups has a predetermined period in each horizontal arrangement, but an arbitrary horizontal arrangement is an arrangement having a phase different from the horizontal arrangement above or below it,
The video display device, wherein the diffuser is a diffuser that diffuses in the vertical direction compared to the horizontal direction, and controls the video by controlling the light modulation element group. The light emitting element group alternately emits light at different positions, and in synchronization with the light modulating element group, the right eye image and the left eye image for fusing a stereoscopic image are alternately displayed to an observer. The video display device according to claim 1. 3. The video display device according to claim 1, wherein the diffuser is a diffusion plate in which a plurality of micro lenses are arranged in a plane or curved surface. The light from the light emitter includes light of a plurality of hues, and includes a color filter element group that selects light of a hue that is transmitted from light irradiated on each modulation element of the light modulation element group. The video display device according to claim 1, wherein the video display device is a device. 5. The video display device according to claim 1, wherein an arbitrary horizontal array of the light collecting element groups has a predetermined phase difference from an upper or lower array thereof. 6. . 2. A controller for controlling the position of the light emitting area according to the position of the observer so that light from the light emitting area of the light emitter reaches the left eye and the right eye of the observer. 5. The video display device according to any one of 5 to 5.

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