JP2007304609A - Stereoscopic two-dimensional image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stereoscopic two-dimensional image display device having simple structure. <P>SOLUTION: The stereoscopic two-dimensional image display device has: a display part having a plane image display surface on which a two-dimensional image including an image to be displayed and a black background is displayed; an image transmission panel arranged separately in parallel with the image display surface, comprising a microlens array comprising a plurality of lenses and having effective area wider than the image to be displayed and a lens frame area surrounding the periphery of the effective area of the microlens array and generating an image forming surface on which the real image of the two-dimensional image is displayed in space positioned ahead of the lens frame area on an opposite side to the display part of the microlens array; an image forming spot display object arranged in the vicinity of the image forming surface; and a housing surrounding an optical path between the display part and the image transmission panel and making it dark. The display part comprises an organic electroluminescence display, a plasma display or a color liquid crystal display device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display device that displays a two-dimensional image including a stereoscopic image.

  As a reproduction of a stereoscopic image, there is a polarization method in which a viewer wears polarized glasses and visually observes left and right parallax images based on different polarization states, but there is a drawback that it is difficult for the viewer to wear polarized glasses.

  As a stereoscopic image display device that does not use polarized glasses, a stripe image alternately arranged from two right and left parallax images, that is, a parallax image corresponding to both eyes of the viewer is supplied to both eyes of the viewer using a lenticular lens. For example, a display method for recognizing a stereoscopic image is known.

  This method has a drawback that the resolution when displaying a stereoscopic image is reduced to half.

  Therefore, when viewing a stereoscopic image using a lenticular lens, display is performed by using polarizing means in which polarizing plates having polarization axes in directions orthogonal to each other are appropriately arranged at a predetermined pitch alternately in a predetermined direction. A stereoscopic image display device that prevents unnecessary reflected light on a surface or reduces moiré, color shift, or the like is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-221644.

  However, in any conventional stereoscopic image display device, a parallax image corresponding to both eyes of the viewer is required from the stage of imaging, and many means for supplying the image are necessary.

  An object of the present invention is to solve such problems and to provide an image display device capable of displaying a stereoscopic image with a simple configuration.

A stereoscopic two-dimensional image display device according to claim 1 of the present invention includes a display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background,
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The display unit is composed of an organic electroluminescence display.

A stereoscopic two-dimensional image display device according to claim 2 according to the present invention includes a display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background,
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The display unit includes a plasma display.

A stereoscopic two-dimensional image display device according to claim 3 according to the present invention includes a display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background;
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The display unit includes a color liquid crystal display device.

  A stereoscopic two-dimensional image display device according to a fourth aspect of the present invention is the stereoscopic two-dimensional image display device according to the third aspect, wherein the display unit covers the entire surface of the backlight illumination unit and the backlight illumination. A color liquid crystal unit disposed in the backlight unit, a monochrome liquid crystal unit disposed between the backlight illumination unit and the color liquid crystal unit, and the color liquid crystal unit includes a two-dimensional image including the image to be displayed. A video signal supply unit that supplies a video signal, and a mask signal generation and supply unit that supplies a mask signal for masking a background portion of the two-dimensional image to the monochrome liquid crystal unit.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an example of an embodiment of an image display device that displays a two-dimensional image including a stereoscopic image according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an image display device that displays a two-dimensional image including a stereoscopic image. The image display device includes a color liquid crystal display device (LCD) 10 and an image transmission panel 20 supported by a support member 15 fixed to the LCD. The image transmission panel 20 generates an image plane 30 in a space located on the opposite side of the LCD.
The LCD 10 is a display unit having a planar image display surface for displaying a two-dimensional image including a stereoscopic image. The display unit is not limited to the LCD, and for example, a display device using a cathode ray tube, a plasma display, an organic electroluminescence display, or the like can be used. In the case of the LCD 10, the LCD includes a color liquid crystal panel 10a having a flat image display surface, a backlight illumination unit 10b, and a color liquid crystal driving circuit 10c. The color liquid crystal driving circuit 10c is connected to a video signal supply unit 11 that supplies a video signal for a two-dimensional image including a stereoscopic image.
The image transmission panel 20 includes a microlens array 22 and a lens frame area 23 surrounding the effective area thereof, for example, a lens frame. The support member 15 supports the lens frame region 23, and the image transmission panel 20 is positioned in parallel with the image display surface of the color liquid crystal panel 10a. The microlens array 22 is an erecting equal-magnification optical system for viewing a two-dimensional image including a three-dimensional image written on the image display surface, and has a wider effective area than the three-dimensional image in the two-dimensional image. Yes. In this embodiment, the effective area of the microlens array 22 is the same as the area of the image display surface of the color liquid crystal panel 10. The lens frame region 23 exhibits a dark color such as black, and suppresses the degree to which the viewer is aware of the presence of the microlens array.
The microlens array 22 is composed of a plurality of microlenses arranged two-dimensionally. As shown in FIG. 1, the microlens array 22 is a micro convex lens plate in which two lens array halves 24 are integrated as a set. In the micro-convex lens plate, a plurality of lens systems composed of a pair of convex lenses having optical axes arranged coaxially are arranged two-dimensionally so that the optical axes are parallel to each other. FIG. 2 is a cross-sectional view of the microlens array 22 cut along a plane including the optical axis 26 of each convex lens 25. The convex lens 25 formed on the right side of the lens array half 24 on the right side of the figure has a larger curvature than other convex lenses, and the image side focal point (imaging) of the lens array half 24 on the right side of the figure. The distance L2 between the surface 30) and the lens surface is longer than the distance L1 between the liquid crystal panel 10a and the lens surface of the lens array half 24 on the left side of FIG. Therefore, the image plane 30 is sufficiently separated from the image transmission panel 20 and the depth of the image display device can be made compact. Therefore, the image plane 30 is sufficiently separated from the image transmission panel 20 and the depth of the image display device can be made compact. As shown in FIG. 2, the convex lenses 25 are made of the same material and have the same shape. For example, the convex lenses 25 are aligned and formed adjacent to each other in a matrix on a transparent flat plate. The optical axes 26 of the convex lenses 25 coincide with each other in adjacent lens array halves 24 in pairs. The material of the convex lens 25 and the transparent flat plate 27 is acrylic, but glass may be used for the transparent flat plate.
The operation of the image display apparatus will be described. As shown in FIG. 3, an LCD 10 is prepared on a stage 19 that exhibits a dark color such as black, with a black surrounding 10 d of a liquid crystal panel 10 a that displays a two-dimensional image including a stereoscopic image. A support plate, which is a support member 15, is fixed around the liquid crystal panel 10a of the LCD 10 so as to be vertical so as to block the visual field in the horizontal direction. This support member 15 is also black at least inside the liquid crystal panel 10a. The free edge portion of the support plate is provided with a carrier portion 15a at the lower end and a spring portion 15b that can apply an elastic force in the horizontal direction opposite to each other at the upper portion.
The lens frame region 23 of the image transmission panel 20 is inserted so as to be sandwiched between the spring portions 15b, and the image transmission panel is placed on the support portion 15a, and is spaced apart from and parallel to the image display surface of the LCD 10. Since the lens frame region 23 is black, the support member 15 can be hidden from the viewing side. The image display surfaces of the image transmission panel 20 and the LCD 10 have a relative positional relationship in which the image display surface and the object-side focal plane of the microlens array 22 are matched in advance. In this way, when an image (stereoscopic image) of the subject is formed on the image display surface of the LCD 10, it is formed on the image side focal plane, and the real image of the stereoscopic image can be viewed from substantially the optical axis direction. become. In this case, a reproduced image is obtained from a three-dimensional image formed on the image display surface of the LCD 10, and therefore the image display surface side is the object side.
If a two-dimensional image including a three-dimensional image to be displayed is a two-dimensional image in which a non-stereoscopic image such as a background exhibits a dark color such as black by a known image signal processing method that separates image signals according to luminance level and color level. Further, since the periphery 10d of the liquid crystal panel 10a and the support member 15 also have a dark color such as black inside at least the liquid crystal panel 10a side, only a stereoscopic image (real image) to be displayed is projected forward from the viewer, as if it is three-dimensional It can be recognized as an image. The stereoscopic image target is preferably a dynamic object such as a moving animal or vehicle rather than a static object.
Further, by disposing an actual object 31, that is, an imaging location display part in the vicinity of, or before and after, the imaging plane 30 where the real image P of the stereoscopic image is generated, the parallax is viewed from the viewer. A stereoscopic two-dimensional image having no image information is recognized more stereoscopically. In the above embodiment, the example in which the image transmission panel 20 is detachably fixed around the liquid crystal panel 10a of the LCD 10 via the support member 15 has been described. However, as another embodiment, as shown in FIGS. The support member 15 can be expanded so that the image transmission panel 20 side, at least the light path side, has a dark color such as black, so that an integrated housing 40 surrounding the light path can be obtained. It is preferable that the display surface width of the liquid crystal panel 10a and the effective width of the microlens array 22 are made uniform, that is, the effective areas of both are substantially the same. For this purpose, slit portions 41 corresponding to the thicknesses of the image transmission panel 20 and the liquid crystal panel 10a are respectively provided in the integrated housing 40, and both are fitted and fixed at a predetermined distance. As a result, the lens frame region 23 around the microlens array 22 need not be black, and instead the front surface 40a of the housing 40 is darkened. Furthermore, a circuit storage portion 43 for storing components such as a drive circuit can be provided inside the integrated housing 40 on the back side of the liquid crystal panel 10a. With the above configuration, a compact stereoscopic image display apparatus can be achieved.
In addition, as another embodiment, the video signal supply unit 11 of the stereoscopic two-dimensional image display device has a function of supplying a video signal that becomes a two-dimensional image exhibiting a dark color other than the stereoscopic image to the drive circuit and the display unit. Can be provided. As still another embodiment, as shown in FIG. 6, a backlight illuminator 10b, a color liquid crystal panel 10a arranged to cover the entire surface of the backlight illuminator, a backlight illuminator 10b, and a color liquid crystal panel 10a A display unit 10 including a black and white liquid crystal unit 12 disposed therebetween can be provided. In this case, the stereoscopic two-dimensional image display device is connected to the black and white liquid crystal driving circuit 10f and the video signal supply unit 11 that supplies a video signal including a two-dimensional image including a stereoscopic image. A mask signal generation / supply unit 10g that generates a mask signal for masking the portion and supplies the mask signal to the black and white liquid crystal driving circuit 10f is provided. With this configuration, during image reproduction, the color liquid crystal driving circuit 10c drives the color liquid crystal panel 10a to form all two-dimensional images, and at the same time, the black and white liquid crystal driving circuit 10f drives the black and white liquid crystal unit 12 to generate a mask signal. A portion other than the corresponding stereoscopic image is masked. Therefore, in a two-dimensional image including a three-dimensional image to be displayed, a non-stereoscopic image such as a background can be a dark color such as black.
Further, as a further embodiment, as shown in FIG. 6, without providing the monochrome liquid crystal unit 12 and its driving circuit 10f, the mask signal of the mask signal generation and supply unit 10g is applied to the mask processing circuit 10h indicated by a broken line. A video signal in which a portion other than a three-dimensional image is masked in circuit can be generated and supplied to the color liquid crystal driving circuit 10c.
[The invention's effect]

As described above, according to the present invention, the microlens array is held so that the image display surface on which the two-dimensional image including the stereoscopic image is displayed coincides with the object-side focal plane of the microconvex lens. Since the array forms a real image of the upright image of the two-dimensional image on the image plane without providing a diffusing plate such as a screen, a two-dimensional image including a three-dimensional image is stereoscopically formed with a very simple configuration. Can be displayed. Further, unlike the conventional method, the polarizing glasses are not required and the resolution of the stereoscopic image is not lowered.
Since the microlens array is relatively inexpensive and excellent in mass productivity, a stereoscopic image display device can be easily configured by combining with a two-dimensional (planar) display.

1 is a schematic cross-sectional view of a stereoscopic image display device according to the present invention. The fragmentary sectional view of the micro lens array of the stereoscopic image display device by this invention. 1 is a schematic perspective view of a stereoscopic image display device according to the present invention. Sectional drawing of line AA shown in FIG. The front view of the three-dimensional image display apparatus of other embodiment by this invention. The schematic sectional drawing of the three-dimensional image display apparatus of the other Example by this invention.

Explanation of symbols

10 LCD
10a color liquid crystal panel 10b backlight illumination unit 10c color liquid crystal drive circuit 10d 10f surrounding liquid crystal panel black and white liquid crystal drive circuit 10g mask signal generation supply unit 11 video signal supply unit 12 monochrome liquid crystal unit 15 support member 15a support unit 15b spring unit 19 stage 20 Image transmission panel 22 Micro lens array 23 Lens frame area 24 Lens array half 25 Convex lens 26 Optical axis 22 of convex lens Micro lens array 31 Actual object 40 Case 41 Slit part 43 Circuit storage part

Claims (4)

A display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background;
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The three-dimensional two-dimensional image display device, wherein the display unit is composed of an organic electroluminescence display. A display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background;
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The three-dimensional two-dimensional image display device, wherein the display unit is a plasma display. A display unit having a planar image display surface for displaying a two-dimensional image including an image to be displayed and a black background;
A microlens array which is arranged in parallel with the image display surface and has a plurality of lenses and has a wider effective area than the image to be displayed; and a lens frame region surrounding the periphery of the effective region of the microlens array And an image transmission panel that generates an imaging surface that displays a real image of the two-dimensional image in a space that is opposite to the display unit of the microlens array and in front of the lens frame region;
An imaging location display object disposed in the vicinity of the imaging plane;
And a dark housing surrounding the optical path between the display unit and the image transmission panel,
The three-dimensional two-dimensional image display device, wherein the display unit is a color liquid crystal display device.   The display unit includes a backlight illumination unit, a color liquid crystal unit disposed so as to cover the entire surface of the backlight illumination, and a monochrome liquid crystal unit disposed between the backlight illumination unit and the color liquid crystal unit. A video signal supply unit for supplying a video signal including a two-dimensional image including the image to be displayed to the color liquid crystal unit; and a mask signal for masking a background portion of the two-dimensional image to the monochrome liquid crystal unit. The stereoscopic two-dimensional image display device according to claim 3, further comprising a mask signal generation and supply unit that supplies the mask signal.

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