JPH07270711A - Information display device - Google Patents

Abstract

PURPOSE:To enable an information viewer to stereoscopically view the information based on the luminous fluxes subjected to light modulation by a simple constitution without using an imaging optical system by adequately adjusting photoirradiation on the surface of a diffusion screen in correspondence to the spacing between both eyes of the information viewer. CONSTITUTION:The distance between points 13, 14 is defined as Wa, the distance between the right eye and the left eye as Wb, the distance between the diffusion screen 5 and the pupils as db and the distance between an intersected point 17 and the diffusion screen as da, then da=Wa.db/(Wb-Wa) is obtd. Since the distance db and the spacing wb are fixed, the position where the information is to be displayed, i.e., the distance da from the diffusion screen 5 to the display information, is changed by changing the distance Wa within a range smaller than the distance Wb. The distance Wa of this time is set by adjusting the light modulation by an optical modulator 2 within the range smaller than the distance Wb according to the scanning speed by a scanning system in the positions 13, 14 where laser beams are made incident on the diffusion screen. As a result, the information is displayed and observed at an arbitrary distance from the diffusion screen 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information display device capable of stereoscopically displaying information, and the present invention spatially superimposes the displayed information and the information such as landscapes on the same field of view. The present invention relates to an information display device suitable for a head-up display or the like to be observed.

[0002]

2. Description of the Related Art Conventionally, driving information of a passenger car, such as panel information such as vehicle speed, direction indication, remaining fuel amount, time, mileage, etc., is displayed on an instrument panel such as a meter or a lamp. Was displayed. In this case, the visual recognition of various signs and the visual recognition of panel information on the road and its periphery have a large gap in both the direction of the line of sight and the distance at which the eyes are focused, which is not a little problematic for safe driving.

In order to solve this problem, special table 3-500340
In the gazette, a part of the windshield is a semi-transparent mirror and the necessary information is displayed on a display such as a liquid crystal panel provided inside the panel, and it is guided to the observer's eye through an imaging lens and a semi-transparent mirror. A head-up display device has been proposed which displays information on a display device at a position 1 to 2 m in front of a windshield.

Further, in Japanese Patent Laid-Open No. 62-5288, a volume hologram having a diffuser plate as an object is provided in a part of a windshield instead of the semi-transparent mirror, and a modulator-equipped laser is provided in an instrument panel. A head-up display device has been proposed in which a volume hologram is scanned by the beam scanner, and thereby information to be displayed is observed through the hologram surface.

[0005]

However, in the case of the head-up display device using the semi-transparent mirror, since the virtual image of the screen of the display is used, considering the brightness of the display and the visibility of the display, The size of the imaging lens is preferably close to the instrument panel. Therefore, the focal length becomes large, and the distance between the display screen and the imaging lens is close to the focal length, which causes a problem that the entire apparatus becomes bulky.

Further, in the case of a head-up display device using a volume hologram, the volume hologram surface is scanned by one beam, and therefore, 1 to 2 m in front of the windshield.
There is a problem that the information is visually recognized at the position of when viewed with only one eye, and when viewed with both eyes, the windshield surface becomes the information display surface.

Further, the volume hologram has a production problem that, unlike the relief hologram, the hologram has to be prepared individually, and at the present stage, the hologram photosensitive material has long-term reliability. There was a problem that it was difficult to get.

The present invention uses a light beam that has been optically modulated to make a diffusion screen.
When the information based on the light beam modulated by the light is stereoscopically viewed through the diffusion screen surface, the information is projected onto the diffusion screen surface corresponding to the distance between the eyes of the information viewer. It is an object of the present invention to provide an information display device capable of three-dimensionally visually recognizing information based on the light beam that has been light-modulated by a simple configuration by appropriately adjusting the light irradiation of (3) without using an imaging optical system.

[0009]

In the information display device of the present invention, (1-1) a light beam modulated by light is scanned on a diffusion screen surface through a scanning system, and the light beam is passed through the diffusion screen surface. , When visually recognizing information based on the light-modulated light flux at a position separated by a finite distance from that, visual recognition of one point of the information is performed at an interval narrower than the distance between both eyes of the information viewer on the diffusion screen. The feature is that it is performed by irradiating two points with light. In particular, (1-1-1) the diffusion screen has a diffusion characteristic that allows information located on the opposite side of the information viewer to sandwich the diffusion screen to be visually recognized through the diffusion screen.

(1-1-2) Information based on the light beam modulated by the light and information located on the side opposite to the information viewer across the diffusion screen are spatially arranged via the diffusion screen. Both of them were observed in the same visual field.

(1-1-3) The diffusion screen is a directivity limited screen.

(1-1-4) The directivity limited screen
He regularly embedded a large number of spherical semi-transparent mirrors with small rectangular openings in a transparent resin plate and controlled the width and height of the rectangular openings to control the light diffusion characteristics. It is characterized by such things.

(1-2) The light-modulated light beam is scanned on the diffusion screen surface via the scanning system, and the light-modulated light beam is passed through the diffusion screen surface and at a position finite distance from the diffusion screen surface. When visually recognizing information based on the above, for visual recognition of one point of the information, two display systems for irradiating light on two points on the diffusion screen that are narrower than the distance between both eyes of the information viewer are provided.
It is characterized in that the wavelengths of the light beams in the two display systems are different from each other so that the respective information can be visually recognized with different colored lights. In particular, (1-2-1) the diffusion screen is a directivity limited screen.

(1-2-2) The directivity limited screen
He regularly embedded a large number of spherical semi-transparent mirrors with small rectangular openings in a transparent resin plate and controlled the width and height of the rectangular openings to control the light diffusion characteristics. It is characterized by such things.

[0015]

The information display device according to the present invention optically scans a diffusion screen with a light beam which has been modulated, and at that time, irradiates the diffusion screen surface with light corresponding to the distance between both eyes of an information viewer. The information based on the light beam modulated by the light is stereoscopically viewed through the diffusion screen surface by appropriately adjusting the light. The light is modulated by a simple configuration without using an imaging optical system. Information based on luminous flux can be viewed in three dimensions

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of the essential portions of a first embodiment of the present invention, and FIG.
FIG. 2 is a perspective view of a part of FIG. 1. In the figure, 1 is a laser light source, 2 is an optical modulator, 3 is a deflector (light beam vertical deflector)
Is composed of a plane mirror, has a rotation axis or a vibration axis parallel to the mirror surface and parallel to the paper surface, and scans the light flux in a direction perpendicular to the paper surface. Reference numeral 4 denotes a deflector (light beam horizontal deflector) which is composed of a plane mirror, has a rotation axis or a vibration axis parallel to the mirror surface and perpendicular to the paper surface, and scans the light beam in the paper surface. Reference numeral 5 denotes a diffusion screen, which is composed of a transmissive screen having a diffusion surface 6 having directivity. 7,
Reference numerals 8 are the right and left eyes of the information viewer.

In the present embodiment, each element 1, 2, 3, 4, 5 constitutes one display system.

The horizontal direction of the diffusion screen 5 (vertical direction in the plane of the drawing) is x-axis, the direction perpendicular to the plane of the drawing is y-axis, and the traveling direction of light (left-right in the plane of the drawing) is z-axis.

In this embodiment, the laser light from the laser light source 1 is optically modulated by the optical modulator 2 based on the display information and then is incident on the deflector 3. Then, the light 10 reflected and deflected in the y-axis direction by the deflector 3 is guided to the deflector 4, and the light 11 (12) reflected and deflected in the x-axis direction by the deflector 4 causes the diffusion screen 5 surface. The top is scanned two-dimensionally. The deflectors 3 and 4 are composed of rotary mirrors, galvano mirrors, rotary polygon mirrors, etc., and perform optical scanning by rotating or vibrating.

In this embodiment, the laser light from the laser light source 1 is controlled to be turned on / off based on the information displayed by the optical modulator 2, and the passing light is optically modulated to thereby diffuse the diffusion screen. −
On the screen 5 based on information (two-dimensional image information)
Optical scanning with the light.

Now, a case will be described in which the information viewer visually recognizes information about one point among information having a predetermined area through the diffusion screen 5 with the right eye 7 and the left eye 8.

The laser light irradiates points 13 and 14 on the surface of the diffusion screen 5 by the optical modulation of the optical modulator 2 through the scanning system. Diffused light is emitted from points 13 and 14. Of these, a part 15 of the diffused light from the point 13 is incident on the right eye 7, and a part 16 of the diffused light from the point 14 is incident on the left eye 8. At this time, it is desirable that the diffusion screen 5 has a diffusion characteristic so that the scattered light from the point 13 (point 14) does not enter the left eye 8 (right eye 7).

The information viewer visually recognizes the light beam 15 and the light beam 16 through the diffusion screen 5 as a light beam emitted from the intersection 17 when they are extended. That is, the information viewer stereoscopically views the information through the diffusion screen 5 as if an information point was displayed at the intersection 17.

Next, the setting of the distance from the diffusion screen 5 which visually recognizes that information is displayed to the intersection 17 in the present embodiment will be described.

As shown in FIG. 1, the distance between the points 13 and 14 is w _a , the distance between the right eye and the left eye is w _b , the distance from the diffusion screen 5 to the pupil is d _b , and the intersection 17 From diffusion screen
If the distance to the down and _{d a, d a = w a} · d b / (w b -w a) and made (1).

Since the distance d _b and the interval w _b are set to be constant, in the present embodiment, by changing the distance w _a within a range smaller than the distance w _b , the position at which information should be displayed, That is, the distance d _a from the diffusion screen 5 to the display information is variously changed. In this case the distance w _a Les - The - light diffusing screen - incident on emission surface position 13, 1
4 is set by adjusting the light modulation by the light modulator 2 within a range smaller than the distance w _b according to the scanning speed of the scanning system.

In this embodiment, this results in the diffusion screen 5.
Information is displayed at an arbitrary distance from the
It is possible to observe through the computer 5. In this embodiment, the laser light modulated by the optical modulator based on the information may be emitted from the laser light source.

FIG. 2 is an explanatory view of the main part when the arrow pattern is visually recognized as information through the diffusion screen 5 as information. A laser beam is applied to the diffusing surface 6 of the diffusing screen 5 by a scanning system (not shown) and an optical modulator (not shown) at positions corresponding to the arrow patterns 18 and 19. There is. At this time, part of the scattered light from the arrow pattern 18 enters the right eye 7 of the information viewer, and part of the scattered light from the arrow pattern 19 enters the left eye 8 of the information viewer. Then, the information viewer stereoscopically views the light incident on both eyes via the diffusion screen 5 as if the arrow pattern 20 is displayed at the intersection of the oppositely extended lights.

FIG. 3 is a schematic view of the essential portions of Embodiment 2 of the present invention. This embodiment is different from the embodiment of FIG. 1 in that the laser light source 1
(1a, 1b), optical modulator 2 (2a, 2b), deflector 3
(3a, 3b), 4 (4a, 4b), and two identical display systems 31 with diffusion screen 5 (5a, 5b).
They are different in that (31a, 31b) are provided for the right eye and the left eye, respectively, and the light flux based on information is guided to the corresponding eye, respectively, and the other configurations and the functions of the respective elements are the same. Is.

This embodiment is different from the first embodiment in that the deflectors 3 and 4 are
The feature is that the scanning width for optical scanning becomes narrower and the overall size of the device can be easily reduced. In this embodiment, the two diffusion screens 5a and 5b may be integrally formed.

FIG. 4 is a schematic view of the essential portions of Embodiment 3 of the present invention. In this embodiment, two display systems shown in the embodiment of FIG. 1 are provided,
Laser light sources having different oscillation wavelengths are used for the laser light sources 1a and 1b, and laser light sources for the optical modulators 2a and 2b are used.
The light source 1a, 1b is used to perform optical modulation corresponding to the oscillation wavelength. The information viewer visually recognizes the information related to the display system 41a (point 17a) and the information related to the display system 41b (point 17b) with different color lights in the same visual field. This improves the identification of information.

FIG. 5 is a schematic view of the essential portions of Embodiment 4 of the present invention. In this embodiment, a reflection type diffusion screen 36 is used as the diffusion screen as compared with the embodiment of FIG. 1, and the laser light source 1, the optical modulator 2 and the scanning system are replaced with the diffusion screen 36. On the other hand, the difference is that it is provided on the information viewer side, and the other configurations are the same.

Next, the diffusion screen used in each of the above embodiments will be described. The diffusion screens that are widely used at present are both transmission type and reflection type as shown in FIG. 6 (a).
It has the diffusion characteristics as shown in. This diffusion screen
Since the spread angle of the diffused light is large, if this is used in the information display device of FIG. 1, for example, a part of the diffused light at the point 13 will enter the left eye 8 as noise light although it is weak. Similarly, part of the diffused light from the point 14 enters the right eye as noise light. These are weakly visible as ghosts on either side of point 17. In order to avoid this problem, as shown in FIG. 6 (b), a diffusion screen in which the diffusion characteristics are controlled so that the diffused light is limited to a certain narrow range.
You can use (Hereinafter, this screen is referred to as "directivity limited screen".) An example of such a directivity limited screen is a screen composed of a fly-eye lens in which a plurality of minute lenses are densely spread. -It is known. If the shape of the opening of this fly-eye lens is made rectangular, the spread angle of diffused light in the width direction and the spread angle of diffused light in the height direction can be controlled individually by changing the width and height of the rectangle. You can do it. If the diffusion screen of the first embodiment is replaced with such a directivity limited screen, the divergence angle in the x direction is reduced, and the ghost is eliminated by increasing the divergence angle in the y direction. In addition, it is possible to cope with changes in the vertical position of the eyes of the information viewer and is optimized. Such a directivity limited screen exerts an excellent effect in all the other embodiments.

Next, a head-up display of an automobile or the like
A description will be given of the structure of the reflection-type directivity-limited screen, which gives good results when used in an apparatus. FIG. 7 is a partially enlarged view of the reflective directivity limited screen 36. A thin metal film such as aluminum or SiO is formed on the fly-eye lens surface side of the sheet 33 in which a plurality of minute fly-eye lenses 34 are molded on one surface of a resin substrate such as acrylic or polyester.
_2. An inorganic thin film such as MgO is attached by a method such as vapor deposition or sputtering to form a half mirror reflection surface. At this time, the thickness of the thin film is controlled to control the reflectance of the fly-eye lens surface 34. Next, the fly-eye lens surface 34 side of this sheet is filled with another resin 35 to form a structure in which the fly-eye lens surface 34 is embedded in the parallel plate sheet. Instead of the resin 35, a parallel plate sheet of resin may be attached to the sheet 33 with an adhesive.

When a light beam 37 from a scanning system (not shown) on the information viewer's side is incident on the reflection type directivity limited screen 36 thus obtained, the incident light is, for example, 25.
% Becomes a reflected light flux 38 with limited directivity,
A part 39 thereof is incident on the eye 47. A part of the reflected light beam, in which the directivity of the other incident light beam is limited, also enters the other eye. The light fluxes incident on the respective eyes are extended in the opposite directions and visually recognized as if the display information 41 exists at the intersecting positions. On the other hand, the light beam 4 emitted from the real object 42 such as a landscape on the opposite side of the observer with the directivity limited screen 36 interposed therebetween.
25% of 3 is reflected by the fly-eye lens surface 34 and becomes diffuse reflected light 44, but the remaining 75% is transmitted through the screen 36 as it is, becomes a transmitted light beam 45, and is incident on the eye 47.
As a result, the information viewer clearly sees the slightly darkened real object 42 through the screen 36. Such a reflective limited-direction screen 36 can be easily mass-produced by a resin molding technique and a continuous vapor deposition technique.

FIG. 8 is a schematic view of the essential portions of Embodiment 5 of the present invention. In this embodiment, a limited directivity screen 36 is provided on a part of the windshield of an automobile to provide a head-up display.
(HUD) is an information display device. In the figure, reference numeral 48 is a vehicle dashboard, and 49 is an opening. In the present embodiment, the light flux from the scanning system (not shown)
The light is emitted toward the reflection-type directivity limited screen 36 provided on at least a part of the optical axis 0 and is optically scanned. The screen 36 is irradiated with light relating to, for example, the arrow pattern 18 for the right eye 7 and the arrow pattern 19 for the left eye.
The driver visually recognizes one arrow pattern 20 at a position where the eyes of the respective arrow patterns 18 and 19 of the respective eyes intersect.

[0037]

According to the present invention, the diffusion screen is optically scanned by the light beam modulated as described above, and the information based on the light beam modulated by the light is stereoscopically viewed through the diffusion screen surface. In this case, by appropriately adjusting the light irradiation on the diffusion screen surface in accordance with the distance between the eyes of the information viewer, the light beam modulated by the simple structure can be obtained without using the imaging optical system. It is possible to achieve an information display device capable of stereoscopically viewing based information.

In addition to this, the present invention has many excellent effects as follows.

(2-1) Since the image forming optical system for re-imaging the information displayed on the display surface of the display is not required, the apparatus becomes compact.

(2-2) By using the laser as the light source, the brightness of the display information is increased and the display device is easy to see.

(2-3) The screen used in the present invention is not a hologram screen but an inexpensive and stable directivity limited diffusion screen, which is advantageous in terms of mass productivity and reliability. .

(2-4) Screen for displaying one point
By adjusting the position and interval of the two bright spots on the screen, you can set the display position of the display information at the same time as the depth,
3D display is possible by displaying information in different directions.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a first embodiment of the present invention.

FIG. 2 is an explanatory view of a main part showing a display state of the first embodiment.

FIG. 3 is a schematic view of the essential portions of Embodiment 2 of the present invention.

FIG. 4 is a schematic view of the essential portions of Embodiment 3 of the present invention.

FIG. 5 is a schematic view of the essential portions of Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram of diffusion characteristics of a diffusion screen. (A) is a diffusion characteristic of a normal diffusion screen. (B) is a diffusion characteristic of a directivity limited screen used in the present invention.

FIG. 7 is an enlarged cross-sectional view of a reflective directivity limited screen and its optical function.

FIG. 8 is a schematic view of the essential portions of Embodiment 5 of the present invention.

[Explanation of symbols]

1 light source 31a, 31b display system 2 light modulator 41a, 41b display system 3 deflector (light flux vertical deflector) 36 reflection type directivity limited screen 4 deflector (light flux horizontal deflector) 48 car dashboard
Do 5 Diffuse screen 49 Scanning light exit window 6 Diffusing surface 50 Windshield 7 Observer's right eye 8 Observer's left eye 13 Right eye irradiation point 14 Left eye irradiation point 17 Virtual image of display point

Claims (8)

[Claims] 1. A light-modulated light beam is scanned on a diffusion screen surface through a scanning system, and information based on the light-modulated light beam is passed through the diffusion screen surface and at a finite distance from the diffusion screen surface. When visually recognizing the information, the information regarding one point of the information is visually recognized on the diffusion screen by irradiating two points having a distance narrower than the distance between both eyes of the information viewer. Display device. 2. The diffusion screen has a diffusion characteristic such that information located on the opposite side of the information viewer with the diffusion screen interposed therebetween can be visually recognized through the diffusion screen. Item 1 information display device. 3. Information based on the light-modulated light flux and information located on the opposite side of the information viewer across the diffusion screen are spatially superimposed via the diffusion screen, The information display device according to claim 1, wherein both are observed in the same visual field. 4. The diffusion screen is a directivity limited screen according to claim 1, wherein the diffusion screen is a directivity limited screen.
Information display device. 5. The directivity limiting screen comprises a transparent resin plate in which a large number of spherical semi-transparent mirrors having small rectangular openings are regularly embedded, and the width and height of the rectangular openings are controlled to diffuse light. The information display device according to claim 4, wherein the information is controlled in characteristics. 6. A light-modulated light beam is scanned on a diffusion screen surface through a scanning system, and information based on the light-modulated light beam is passed through the diffusion screen surface and at a finite distance from the diffusion screen surface. When visually recognizing, the visual recognition of one point of the information is performed by providing two display systems for illuminating two points on the diffusion screen, which are closer to each other than the two eyes of the information viewer. An information display device characterized in that wavelengths of light beams in the system are made different from each other so that respective information can be visually recognized by different colored lights. 7. The information display device according to claim 6, wherein the diffusion screen is a directivity limited screen. 8. The directivity limiting screen comprises a transparent resin plate in which a large number of spherical semi-transparent mirrors having minute rectangular openings are regularly embedded, and the width and height of the rectangular openings are controlled to diffuse light. The information display device according to claim 7, wherein the information is controlled in characteristics.