KR19980055980A - Video indicator for viewing stereoscopic and flat images - Google Patents

Abstract

The present invention provides a color stereoscopic and flat screen that enables viewing of stereoscopic and flat images having excellent clarity without using glasses by combining a projection optical system including a Fresnel lens or a holographic screen using an existing flat TV as an image source. It relates to a video display device. The stereoscopic and planar imaging system according to the present invention is a pair of image generators arranged to be symmetrical with respect to the time axis of a central viewer among the viewers, and a pair of image generators for generating planar images, and disposed on an optical path of an image from the image generator and the time axis. A pair of reflectors for reflecting the planar images from the image generator in the time axis direction, each disposed in an optical path of the planar image reflected from the reflector, each of the reflected planar images Corresponding to each of these, a pair of chromatographic lenses for superimposing the planar images, reducing color dispersion, and enlarging the superimposed images, and disposed in the optical path of the image from the chromium lenses, the image from the chromium lenses Is diffracted means to be transmitted back to have a wide field of view It should. Unlike the conventional stereoscopic image display, which can only watch stereoscopic images, the imaging apparatus can also view planar images, which can alleviate eye fatigue caused by viewing stereoscopic images. In addition, compared to the conventional autostereoscopic display, it has a reverse range and has a very wide field of view.

Description

Video indicator for viewing stereoscopic and flat images

TECHNICAL FIELD The present invention relates to stereoscopic and planar image indicators, and more particularly to color stereoscopic and planar image indicators made by combining a conventional flat TV and a projection lens system including a Fresnel lens or a holographic screen.

In general, a person sees a stereoscopic image because a different image is projected to both eyes of a person and a stereoscopic image is felt due to its effect. As shown in Fig. 1, when a human's eyes are in the A position where two different images are projected, a stereoscopic image is seen. However, if you observe at the B position where the same image is visible to both eyes, you will see a planar image.

There are two ways to implement three-dimensional images, glasses and glasses-free.

In the case of eyeglasses, the viewer wears special glasses whose transmittance varies depending on light intensity, polarization, and time at the left and right eye positions, and the viewer views an image displayed on the screen. In the case of a head mount display used in virtual reality, images to be projected to the left and right eyes appear on each liquid crystal display, and the images are projected to the corresponding eyes through independent optical channels. In the case of such glasses type, there is a problem in that the stereoscopic feeling is reduced due to the discomfort of wearing glasses and a difference in the visual acuity between the left and right eyes of most viewers.

In the case of the autostereoscopic type, the image corresponding to the left and right eyes is directly projected to the corresponding eye in an optical manner or the depth of the projected image is used to make the 3D effect directly. Among the autostereoscopic display methods, the lenticular method is most commonly used at present. The lenticular method is a method of projecting an image corresponding to the left and right eyes to a corresponding eye through a lenticular plate in which semi-cylindrical lenses are arranged one-dimensionally. However, when using such glasses-free, the number of viewers that can be viewed due to the limited viewing area and field of view is limited, and there is a problem that the eye fatigue is red because the viewer can not change the position of the eye is not enough. In addition, since the shape of the lenticular plate overlaps with the image, there is a problem in that the sharpness of the image is lowered.

Therefore, when eye fatigue occurs while watching a stereoscopic image, a stereoscopic and planar imaging system capable of reducing eye fatigue by moving an eye or a posture to view a planar image is needed. In addition, the field of view and field of view is much wider than the conventional autostereoscopic 3D display, which requires a 3D and planar imaging system that can watch images without interruption and has good clarity.

1 illustrates a general stereoscopic image generation principle;

2 is a block diagram of a color stereoscopic and planar image display according to the present invention;

FIG. 3 shows the principle of inverse formation by a holographic screen; FIG.

4 illustrates viewing a screen by a color stereoscopic and planar image display using a holographic screen in accordance with the present invention.

Explanation of symbols on the main parts of the drawings

100: projection lens system

10: lamp

20: diffuser

30: converging lens

40: liquid crystal panel / CRT

50: Sapphire Lens / Composite Lens

60: reflector

70: lighting unit

200: holographic screen / fresnel lens

300: city station

70: viewers

60: planar image viewing area

50: stereoscopic viewing

2 is a block diagram of a stereoscopic and planar imaging system according to the present invention. 100 is a projection light system for projecting two images in combination. The reference numeral 200 is a holographic screen or a Fresnel lens for determining the size of an image projected by the projection light system 100 and allowing the viewing area to be formed at various places. Reference numeral 300 denotes a spatial position where a viewing area is formed by focusing an image transmitted through the holographic screen / fresnel lens 200.

First, the configuration and operation of the projection light system 100 are described as follows. The light from the light source 10 becomes a converging beam having a uniform intensity distribution by the diffuser 20 and the converging lens 30. At this time, the diffuser 20 used a lenticular plate made by crossing each other vertically. Here, the lighting unit 70 is formed by the light source 10, the diffuser 20, and the parallelizing lens 30. The beam emitted from the lighting unit 70 is irradiated to the liquid crystal panel 40. The liquid crystal panel 40 may be directly connected to a camcorder or a video recorder to generate an image to be projected to the left and right eyes of a person. When the CRT is used instead of the liquid crystal panel, the lighting unit 70 is not necessary. Reflectors 60 arranged symmetrically with respect to the time axis A project an image of the liquid crystal panel incident on it to corresponding achromatic lenses 50. The state of the image projected on this chrominance lens is shown as [state of the screen at 50] in FIG. The chrominance lenses 50 reduce dispersion of an image incident on the left and right liquid crystal panels / CRTs and magnify the image so that the images overlap on the holographic screen / fresnel lens 40. At this time, the state of the superimposed image is the same as [the state of the screen at 200]. The left and right chromatium lenses have a rectangular shape, and the center of the lens is at the center of the rectangle. The contact surfaces of these chromium lenses coincide with time axis A and the lenses are arranged perpendicular to time axis A. In this way, the illumination unit 70, the liquid crystal panel / CRT 40, the reflector 60, and the color removal lens 40 constitute the projection lens system 100.

The angle formed by the reflector and the visual axis A is set to be an angle at which the image to be projected to the left and right eyes is precisely superimposed on the Fresnel lens or the holographic screen 1 by the color image lens. To further magnify the image, the projection lens system 100 and the holographic screen 200 may be adjusted such that the image enlarged by the chrominance lens is formed inside the front focal point of the Fresnel lens or the holographic screen.

The viewing zone in which stereoscopic images can be viewed is within the range of the distance between human eyes in the horizontal direction about the visual axis at the position 300 at which the images of the left and right homogeneous chromium lenses are formed by the Fresnel lens or the holographic screen. . Positioning the viewer's eye 70 within this range enables viewing of stereoscopic images. When the left and right eyes are on either side of the visual axis, the planar image can be viewed from either side. The viewing area for viewing the planar image is determined by the size of the image projected by the chromium lens and the Fresnel lens or the holographic screen. In the case of using a holographic screen, the viewing area is formed at various places 50, so that a plurality of viewers can simultaneously watch.

In FIG. 2, the viewing areas of the stereoscopic image are sequentially formed along the horizontal direction according to the present invention. However, the present invention is not limited thereto, and viewing areas of a stereoscopic image may be formed along the vertical direction. This is described later with reference to FIG.

Next, with reference to Figures 3 (A) and 3 (B) will be described a process in which the inverse is made again by the holographic screen. When a reference laser beam and a plurality of signal beams are incident on the holographic photosensitive plate shown in Fig. 3A, a holographic screen having a plurality of viewing areas is formed. When the image 80 from the projection light system 100 is projected on the thus formed holographic screen, viewing areas are formed in various places as shown in FIG. 3 (B), so that several people can view a stereoscopic image at a time.

Referring to FIG. 4, it is described that viewing areas of a stereoscopic image are formed at various places along the vertical direction by the holographic screen. As shown in Fig. 4, when the stereoscopic image is made at various places using the holographic screen, the image projector is disposed at the same position as the viewer when viewed on the holographic screen. When making the holographic screen as shown in Fig. 3, the signal beam should be irradiated so that the viewing field is generated in the vertical direction. Accordingly, when a stereoscopic image is incident on the holographic screen in the projection optical system, a plurality of viewing areas for generating a stereoscopic image along the vertical direction are generated by the object wave shaping function of the holographic screen, and the viewer may view the image at different heights. You can watch.

According to the present invention, a combination of the viewing area in the horizontal direction as shown in FIG. 2 and the viewing area in the vertical direction as shown in FIG. 4 form a plurality of viewing areas in a matrix form in front of the viewer. Accordingly, a number of viewing areas for viewing stereoscopic images can be spatially formed, and thus the number of viewers for viewing stereoscopic images is not limited.

Viewers can choose to view stereoscopic or planar images at locations tens of centimeters or more away from the Fresnel lens or holographic screen. Therefore, while watching a stereoscopic image by changing the viewing area to a planar image can reduce eye fatigue. When using a holographic screen, the viewing area is formed in various places and the field of view is widened, so that several people can watch at the same time.

Claims (7)

A stereoscopic and planar imaging system for allowing a plurality of viewers to selectively view stereoscopic and planar images, A pair of image generators arranged to be symmetrical with respect to the time axis of the central viewer among the viewers and for generating planar images; A pair of reflectors disposed in an optical path of an image from the image generator and symmetrical with respect to the time axis, each reflecting the planar images from the image generator in the time axis direction, A pair of chromatization lenses disposed in an optical path of the planar image reflected from the reflector and each of the reflected planar images is projected correspondingly to overlap the planar images and enlarge the overlapped image; and A diffraction means disposed in an optical path of an image from the chromium lens, and allowing the image from the chromium lens to be transmitted so as to have an inverse and wide field of view again, The image transmitted through the diffraction means forms viewing regions arranged in a plurality of matrix forms each having a stereoscopic image and a planar image along two directions orthogonal to a plane perpendicular to the visual axis, so that a plurality of viewers simultaneously view a stereoscopic image and Stereoscopic and planar imaging systems for viewing planar images. The stereoscopic and planar imaging system of claim 1, wherein each of the viewing areas arranged in a plurality of matrix forms includes a stereoscopic image in a central region thereof and a planar image around the stereoscopic image. The stereoscopic and planar imaging system of claim 1, wherein the image generating means is a CRT. 2. The light source according to claim 1, wherein the image generating means includes a light source for generating light, a diffuser for scattering light from the light source, a focusing lens for focusing light from the light diffuser, and light from the focusing lens. This stereoscopic and planar imaging system comprising a projected liquid crystal display. The stereoscopic lens of claim 1, wherein the chromium lens has a rectangular shape, the center of the lens is at the center of the rectangle, and a contact surface of the chromium lenses coincides with the time axis, and the chromium lenses are disposed to be perpendicular to the time axis. And planar imaging systems. The stereoscopic and planar imaging system of claim 1, wherein the diffraction means is a holographic screen with back inverse. The stereoscopic and planar imaging system of claim 1, wherein the diffraction means is a Fresnel lens.