JPH10123453A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the microdisplay device of a head-up display type which withstands the use of a long time and is safe. SOLUTION: This display device 1 is constituted of a signal/picture converting part 10 converting a picture signal into an actual picture, an optical fiber tube 20 transmitting the picture signal as the shape of the picture itself and a picture displaying part 30 displaying the picture transmitted from the optical fiber tube 20 after being properly picture-processed, and is made as a head-up display type by a spectacles housing type device man body 2 and a pair of bows 4 and 4 freely foldable through hinge parts 3 and 3 on both sides of the device main body 2. A Lippman-Bragg volume hologram is used as the picture displaying part 30. Ambient visual information is simultaneously viewed while viewing an enlarged virtual image by an action where only specified wavelength is reflected in the direction of the certain angle of a hologram and the other spectrum is transmitted and an image enlarging action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called head-up display type microminiature display device using an image conduction tube (image conduit).

[0002]

2. Description of the Related Art Various types of portable display devices such as a head mounted display (HMD) and a head-up display (HUD) have been proposed.

[0003]

However, the conventional display device has a large size and a large weight, which makes it difficult for a user (observer) to endure long-time use. In the case of wearing, since the shape and size are far apart from general glasses, the acceptability of the surrounding person to the user is low, and further, because the sense of discomfort around the user is large, It is not always usable anytime, anywhere, and it is not necessarily easy to use. In addition, many light-emitting units are arranged near the head of the user, and there is a concern about thermal effects on the human body.

Accordingly, the present invention is to provide a display device which is ultra-small, lightweight, highly portable and easy to use.

[0005]

A signal / image converter for converting an image signal into an image, an image conduction tube for transmitting the image signal in the form of an image itself, and an image conduction tube for transmitting the image transmitted from the image conduction tube. An image display unit for displaying is provided, and the signal / image conversion unit and the image display unit are coupled using the image conduction tube so as to be spatially separated.

[0006] The image converted by the signal / image conversion unit is transmitted to the image display unit by the image conduction tube in its own form, where the image is appropriately processed and displayed. Since the signal / image conversion unit and the image display unit are spatially separated by an image conduction tube, for example, a liquid crystal display (LCD), a backlight, a lens, an electric circuit, a power supply, and the like are attached to the face or the like. There is no need to arrange it on the display unit. As a result, an ultra-small and lightweight display device that does not generate heat, electromagnetic waves, or other factors that adversely affect the human body is realized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a very small display device 1 according to an embodiment of the present invention. This display device 1
Is a signal / image converter 10 for converting an electric or optical image signal into an actual image, and an optical fiber tube (image conduction tube) 20 for transmitting the image signal in the form of an image itself.
And a virtual image optical system (image display unit) 30 for appropriately processing and displaying an image transmitted from the optical fiber tube 20. In addition, a pair of handles 4 and 4 that are freely foldable via hinge portions 3 and 3 form a so-called head-up display type.

A signal / image converter 10 includes a backlight (light source) 11 and a transmission type color liquid crystal display (LCD).
12, a diffusion plate 13, and a reduction optical system 14 for fiber coupling composed of large and small convex lenses and the like. The video signal (image signal) is image-converted by the LCD 12 and is illuminated by the backlight 11. The diffusion plate 13 makes it difficult for the observer (user) A to recognize the matrix wiring pattern of the LCD 12, and the diffusion plate 13 allows a good image without pattern noise of the LCD 12 to be observed. The light emitted from the diffusion plate 13 is reduced by the reduction optical system 14 to the diameter of the optical fiber tube 20.
It is to be coupled to.

An optical fiber tube (image conduction tube) 20 is shown in FIG.
As shown in the figure, a plastic fiber is used which comprises a rectangular central portion 21 having a 3: 4 cross-sectional aspect ratio and a peripheral portion 22 having a circular cross-sectional shape. The outer dimensions of the plastic fiber 20 are, for example, Φ3.2 m.
m, the diameter of each fiber is, for example, Φ12 μm, and the resolution is, for example, 60 lp / mm. The signal / image converter 1 is made of plastic fiber 20.
0 and the virtual image optical system (image display unit) 30 are coupled so as to be spatially separated. Further, a part of the plastic fiber 30 on the image exit side is attached to one of the handles 4 (right side in the figure) via a predetermined means.
After the image transmitted by the plastic fiber 20 is adjusted in focus by the visual acuity adjusting lens 5 arranged on the one handle 4 near the image exit of the plastic fiber 20, the holographic image as the virtual image optical system 30 is obtained. The light is incident on the combiner.

As shown in FIG. 3, the holographic combiner 30 is a so-called Lippmann-Bragg volume hologram, which has both reflection wavelength selectivity (wavelength selection function and reflection mirror function) and image magnifying action (concave lens function). is there. That is, this Lippmann-Bragg volume hologram has a characteristic that it reflects only a specific wavelength in a certain angle direction and transmits other spectrums.
Thus, the observer A can see the surrounding visual information while viewing the image on the LCD 12 in a single color (for example, green) (however, the spectrum of the transmitted light lacks green. ing). In addition, due to the image enlarging action of the Lippmann Bragg volume hologram, an image having only the core size of the central portion 21 of the plastic fiber 20 is obtained.
By showing the virtual image (enlarged image) B to the observer A, the image can be enlarged to a sufficient visual field. Also,
As a material of the holographic combiner 30,
For example, there are a photopolymer and a dichromated gelatin. The holographic combiner 30 is attached to a liquid crystal shutter 31 which forms a part of the apparatus main body 2, and the level of the surrounding visual information is controlled by the liquid crystal shutter 31. Also,
A shade 32 is mounted on the upper side of the liquid crystal shutter 31, and the shade 32 blocks extra light from above the apparatus main body 2 to improve image visibility.

Further, an earphone 6 is attached to the lower part of the rear part of one handle 4 which is foldably supported by the apparatus main body 2. Audio information is transmitted to the earphone 6 from the plastic fiber 20 or a normal metal wire (not shown), so that the observer (user) A can obtain audio information in addition to image information.

According to the head-up display (HUD) display device 1 of the above embodiment, the observer A can wear the device main body 2 on the face like a pair of glasses 4 and 4 like glasses. Since the display device 1 can be made small and lightweight like eyeglasses, the observer A can fully enjoy the enlarged image B and the audio information projected on the LCD 12 while using for a long time. In particular, by using the above-described HUD using a holographic combiner as the image display unit 30, it is possible to realize an ultra-compact and lightweight personal portable display device 1. By using this, for example, application to an FM text multiplex broadcast receiving radio, a portable computer display, and the like can be considered, and the versatility of the display device 1 can be further improved.

Further, the display device 1 can be configured by separating the signal / image conversion unit 10 and the image display unit 30 by the optical fiber tube 20. For example, the backlight 11 and the liquid crystal display (LCD) 12. Diffusion plate 1
3. It is not necessary to dispose a reduction optical system 14, a power supply (not shown) and the like in the image display unit 30. Thereby, it is possible to provide a safe display device 1 at low cost, which is free from factors that adversely affect the human body, such as heat generation and electromagnetic noise.

According to the embodiment, the image transmitted from the optical fiber tube can be enlarged and observed by using a Lippmann Bragg volume hologram as a virtual image optical system (image display unit). The image transmitted from the optical fiber tube may be combined with light from the surroundings by using magnifying optical means including a mirror and a convex lens to make it possible to simultaneously magnify and observe. Although a plastic fiber is used as an optical fiber tube (image conduction tube), another image conduction tube such as a glass fiber may be used. Furthermore, although an optical fiber tube in which the vertical and horizontal cross-sectional ratio of the central core shape is 3: 4 is used, the vertical and horizontal cross-sectional ratio of the central core shape is not limited to 3: 4. Of course, a 9:16 rectangular optical fiber tube or a normal circular optical fiber tube may be used.

[0016]

As described above, according to the display device of the present invention, a signal / image converter for converting an image signal into an image, an image conduction tube for transmitting the image signal in the form of an image itself, and The provision of the image display unit for displaying the image transmitted from the image conduction tube enables the signal / image conversion unit and the image display unit to be spatially separated from each other. , And the portability and usability can be further improved. This makes it possible to provide a safe display device that can withstand long-time use and that does not adversely affect the human body such as heat generation and electromagnetic waves.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a very small display device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an optical fiber tube used in the display device.

FIG. 3 is an explanatory diagram of a virtual image optical system (image display unit) used in the display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Device main body, 4, 4 ... Pair of patterns, 10 ... Signal / image conversion part, 20 ... Optical fiber tube (image conduction tube), 21 ... Central part (core), 30 ... Virtual image optical system ( Image display section).

Claims (7)

[Claims] A signal / image converter for converting an image signal into an image; an image conduction tube for transmitting the image signal in the form of an image itself; and an image display for displaying the image transmitted from the image conduction tube. A display device comprising: a signal / image conversion unit; and an image display unit, wherein the signal / image conversion unit and the image display unit are coupled using the image conduction tube so as to be spatially separated. 2. The display device according to claim 1, wherein an optical fiber tube is used as the image conduction tube, and a virtual image optical system is arranged near an image exit of the optical fiber tube as the image display section so that an enlarged image can be observed. A display device, comprising: 3. The display device according to claim 2, wherein the virtual image optical system is arranged in a spectacle-type device main body having a pair of left and right patterns. 4. The display apparatus according to claim 2, wherein an image transmitted from said optical fiber tube is freely magnified by using a Lippmann Bragg volume hologram as said virtual image optical system. 5. The display device according to claim 2, wherein the image transmitted from the optical fiber tube is combined with light from the surroundings by using a half mirror and a magnifying optical means as the virtual image optical system, and simultaneously magnified and observable. A display device, comprising: 6. The display device according to claim 2, wherein the optical fiber tube is made of a plastic fiber having a rectangular shape with a central portion having a predetermined cross-sectional aspect ratio. 7. The display device according to claim 2, wherein the optical fiber tube is made of a glass fiber having a rectangular shape with a predetermined aspect ratio and a cross-sectional aspect ratio of a central core shape.