JPH01147421A - Display system - Google Patents

Abstract

PURPOSE:To observe display information and a face and an action of the other party in the same visual field without allowing the display information to be read by the other party by using a volume phase type hologram, etc., as a luminous flux coupling element and deflecting only a luminous flux of specific wavelength to an observer. CONSTITUTION:A luminous flux from a light source 11 becomes a focusing luminous flux by a condenser lens system 12, made incident on an image forming lens 14, and thereafter, led to an observer 10 as focusing light by a condensing action of a luminous flux coupling element 15. An image of a display element 13 becomes an intermediate image 13A by the image forming lens 14, and this intermediate image 13A is generated as a virtual image 13B in the rear of the luminous flux coupling element 15 by an operation of the luminous flux coupling element 15. The luminous flux coupling element 15 is a volume phase type hologram, etc., reflects only a luminous flux of specific wavelength, and allows other luminous flux to transmit through. In such a way, the observer 10 can observe both image information of a face and an action, etc., of the other party 16 and the display information 13B in the same visual field without allowing the display information 13B to be ready by the other party 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a display system, and in particular to a display system that combines first image information of, for example, a person in front and an artificial The present invention relates to a display system that is suitable for simultaneously observing both image information of second display information that has been created.

(Prior Art) Various display systems using display elements such as CRT, liquid crystal, and plasma have been devised in the past.
There are special usage situations, such as when it is necessary to read necessary information without taking your eyes off the other person's face. For example, at a bank's payment counter, if it becomes clear that the card or traveler's check received from a customer is fraudulent, the bank's payment counter must make arrangements without taking their eyes off the other person's (customer's) face and behavior. It is necessary to perform an operation for this purpose.

In addition, when a computer terminal functions as a multifunction terminal to perform manual labor, when holding internal meetings while receiving and receiving e-mails, or when receiving information coming in from outside one after another. When having a meeting or a meeting with an important partner, such as a business partner, it becomes necessary to look at the other party's face and view displayed information at the same time.

In such cases, if you use a conventional CRT or LCD display system, you will have to look away from the other person when you look at the display, which will not only spoil the atmosphere but also cause you to miss the important reaction of the other person. There was a possibility that it would happen.

In order to solve these problems, a method has been proposed in which display information and visual field (image information) are combined using a flat half mirror.

FIG. 7 is a schematic diagram showing a conventional display system using the half mirror. In the figure, a display image 71 (letter "A" in this example) on a CRT 72 is displayed on a transparent substrate 74.
It is reflected by a half mirror 75 disposed above and becomes a display image. This image is observed by the observer 70 as a virtual image 73.

At this time, the face of the person to be observed 76 and the virtual image (display image) 73 are observed in a superimposed manner.

However, at this time, the displayed image 71 on the CRT 72
is a vertically erect image and horizontally reversed image, and there is a high possibility that the contents of the displayed image 71 will be read through the transparent substrate 74 by the person 76 to be observed. This is the other party (observed person 9)
This is very inconvenient if you do not want someone to read the displayed content.

(Problems to be Solved by the Invention) The present invention is used in cash handling counters, conference rooms, etc., and combines image information such as the face and behavior of the other party and display information from a display element using a light beam coupling element. In a display system that superimposes information on each other and observes information from both sides within the same field of view, even if you are at a certain distance or close to the other person, the display information can be seen without being read by the other person, such as the face or behavior of the other person. The object of the present invention is to provide a display system that allows both image information such as ``image information'' and display information to be observed satisfactorily within the same two fields of view.

(Means for Solving the Problem) The light flux coupling element has a display means for displaying image information and a light-transmissive light flux coupling element that guides the light flux from the display means in a predetermined direction, and the light flux coupling element is provided from the front field of view. At the same time, the forward field of view is observed by guiding the light beam that has passed straight through to the observer,
A display for observing the image information by transmitting or reflecting the light flux from the display means by the light beam coupling element and guiding it to the observer, and superimposing the image information on the front field of view. The system is configured to calculate a ratio of the amount of light deflected by the light beam coupling element and guided to the observer out of the light flux from the display means to a proportion of the amount of light deflected by the light flux coupling element and guided to the forward viewing direction. This is because it is larger than the ratio.

(Embodiment) FIG. 1 is a schematic diagram showing a first embodiment of the present invention. In the figure, 11 is a light source, 12 is a condenser lens system,
13 is a display element, 14 is an imaging lens, 15 is a light beam coupling element, 10 is an observer, and the light beam from the light source 11 becomes a condensed light beam by the condenser lens system 12, and after entering the imaging lens 14, the light beam coupling element 15 The light is guided to the observer 10 as a focused light by the light focusing action. 16 is the observed person, 17
．． 18 is a transparent substrate, and 19 is an adhesive layer. The light beam coupling element 15 is adhered onto a transparent substrate 17, and a transparent substrate 18 is overlapped and adhered to the transparent substrate 18 via an adhesive layer 19. (Adhesive layer 19
And the transparent substrate 18 may be omitted. ) On the other hand, the image of the display element 13 becomes an intermediate image 13A by the imaging lens 14, and this intermediate image 13A becomes a virtual image 13B at an infinity position from 15 cm behind the light flux coupling element 15 due to the action of the light flux coupling element 15. occurs.

Here, the beam coupling element 15 is a volume phase type hologram, which will be described later, and has a property of reflecting only a beam of a specific wavelength and transmitting other beams.

Moreover, since it acts as a mere parallel plate for the transmitted light beam, the observer 10 can clearly see the forward visual field information of the observed person 16 and the like. Further, since it acts as a concave mirror for the reflected light beam, it functions to magnify the intermediate image 13A and create a virtual image 13B in the distance.

In this embodiment, the observer 10 displays image information (virtual image) superimposed on the face of the observed person 16, which is front visual field information.
Since he can see 13B, there is no need to look at the other person's face or behavior even for a moment.

Therefore, for example, if it turns out that a passbook submitted by a customer at a bank payment counter has been reported stolen, the contents can be read while looking at the other person's face, which is a good security measure. can increase the effectiveness of

Further, when the display information 13B is, for example, a face photograph, a montage photograph, a portrait, etc. of the criminal, it becomes possible to effectively compare both the display information 13B and the face of the observed person 16. It can also be expected to have a crime prevention effect.

By using a volume phase type hologram as the beam coupling element 15, it is possible to substantially generate only the reflected first-order diffracted light and zero-order light, and as shown in the figure, surface specular reflection is different from surface specular reflection. The light flux from the display device 3 can be deflected in different directions. Assume now that the diffraction grating 15 produces transmitted diffracted light 9 . At this time, if the amount of transmitted diffracted light is large, for example 10% or more, there is a risk that the displayed information 13A of the left and right reversed images will be read by the person 16 to be observed. However, when using volume type phase holograms, specifically recording materials such as polyvinylcarbazole-based recording materials, gum arabic, dichromate gelatin, etc., the transmission diffraction efficiency is easily less than 3% (furthermore, it can be reduced to 1%). (below), and - wide reflection diffraction efficiency can also be made 35% or more.

The surface reflectance of a normal glass surface is 4% on one side and 8% on both sides.
Due to the extent of the display, the displayed information created by the transmitted diffracted light 9 overlaps with the figure of the observer 10, making it difficult to read.

On the other hand, from the side of the observer 10, his own image is reflected on the surfaces of the glass plates 17 and 18 with a reflectance of 8%, but in contrast, the reflection diffraction efficiency of the porogram 15 with respect to the displayed image 13A is 35% or more. This makes it possible to read the displayed information clearly.

Furthermore, the embodiment of FIG. 1 can be modified to make it difficult for the observer 16 to read it. For example, if the transparent substrate 17 is made of gray colored glass that absorbs visible light over the entire visible light range or colored glass that absorbs the displayed image 13, the displayed image 1
3 becomes more difficult to see.

Furthermore, in addition to coloring, providing an absorbing or reflective layer on one or both sides of the substrate 17 makes it difficult for the observer 16 to see the displayed content.

Furthermore, if the distance between the observer 10 and the observed person 16 is quite close, it is possible that the observed person 16 looks directly into the imaging lens 14, but in this case, the image of the displayed information Since the visible area is limited by the eyes of the observed person 16,
In the intermediate image 13A, only the extreme part, for example, the - character position can be read, and since the left and right characters are reversed, it is very difficult to read the intermediate image 13A.

FIGS. 2(A) and 2(B) are schematic diagrams of an embodiment showing a method of manufacturing a light beam coupling element according to the present invention.

FIG. 2A is a schematic diagram showing an exposure optical system using holography technology for producing a volume phase diffraction grating.

FIG. 2B is a perspective view showing a method of manufacturing a light beam coupling element using a concave Fresnel lens.

In the same figure (A), 21 is a laser light source, 22 is a half mirror, 123 and 231 are mirrors, 24 and 24I are microscope objective lenses, 25 and 251 are convergent lenses, 26 is a convergent light, 27 is a diverging light, and 28 is a transparent substrate , 29 are recording material layers bonded to the transparent substrate 28.

A beam of light from a laser light source 21 is processed by a half mirror 22. Among these, the reflected light beam is reflected by the mirror 23 and expanded by the microscope objective lens 24, and then becomes convergent light 26 by the converging lens 25, passes through the transparent substrate 28, and enters the recording material layer 29. do. At this time, the convergent light flux 2
6 may have an appropriate aberration, such as astigmatism or coma.

Further, as the hologram recording material 29, dichromium gelatin, polyvinyl carbazole type photosensitive material, photopolymer, etc. are used.

On the other hand, the light beam transmitted through the beam splitter 22 is reflected by the mirror 231, passes through the microscope objective lens 241, becomes a diverging light beam 27, and passes through the lens 251 to form the recording material 29.
incident on . Here, the lens 251 uses a convex lens, a concave lens, a parallel plate, or a cylindrical lens as necessary.

The exposed recording material 29 is developed to form a volume phase type diffraction grating, which is used as a beam coupling element.

In the same figure (B), 20B is a transparent reflection plate having a serrated reflection surface, a concave Fresnel lens is formed on one surface, and a reflection film is formed on the slope thereof. The serrated reflective surface has the property of reflecting only a specific wavelength of light or an appropriate amount of light in the entire visible light range, and transmitting light of other wavelengths.

20C is a cover transparent plate which is adhered to the transparent reflector plate 20B using an adhesive having a substantially concave refractive index.

As a result, it acts as a parallel plate for straight transmitted light,
In addition, a light beam coupling element having the function of a spherical or aspherical concave mirror for reflected light can be obtained.

In addition, in terms of manufacturing, it is desirable that the slopes of the transparent reflector 20B have a concentric circular structure, or the inclination of each slope may be adjusted.
It is also possible to produce an aspherical effect by using a shape other than a circular arc.

FIG. 3 is a perspective view showing a second embodiment of the invention. This embodiment is a combination of a laptop computer and a display system according to the present invention. In the same figure,
30 is a laptop computer, 31 is an imaging lens,
34 is a substrate, 35 is a light beam coupling element, and 36 is an observer. As shown in the figure, an imaging lens 3, a transparent substrate 34, and a light beam coupling element 35 are arranged on the computer 30.
The user 10 can read the contents of the displayed information with a natural posture and line of sight.

In this embodiment, it is preferable that the beam coupling element 35 has a cylindrical shape, or that the shape can be freely selected from a conical surface, a spherical surface, a spheroidal surface, etc., as required.

If the beam coupling element has a shape other than a plane in this way, the transmitted diffracted light toward the observed person (not shown) will be subject to large astigmatism or comatic aberration, making it even more difficult for the observed person 16 to decipher it. Sex increases.

FIG. 4 is a schematic diagram showing the laptop computer of the embodiment shown in FIG. 3 being used as a conference terminal. In the same figure, 401.402°403.404
are personal laptop computers, and 41 is a large display screen. Each attendee brings their own materials in the form of a floppy disk, and the content to be shared by everyone is displayed on the display screen 41 via a line (not shown).

At the same time, the head-up display device of the present invention is used as display information on one's own computers 401, 402, etc. for information such as presentation contents and reference materials that only one person wants to see or that other attendees do not want to see. The information displayed on the head-up display device is visible only from the user's position, so the content cannot be read even if an attendee next to you looks in or an attendee in front of you looks at it.

Therefore, you can proceed with negotiations with the other party while always checking what you are doing.

Also, by using e-mail technology, it is possible to obtain information regarding changes in external circumstances during negotiations, and to exchange information among colleagues present without informing the negotiation partner of the content.

FIG. 5 is a schematic diagram showing the laptop computer according to the embodiment shown in FIG. 3 being used in a classroom at a school or the like. In the figure, 51 and 52 are students, 54 is a teacher,
53 is a laptop computer, and 55 is a display screen that corresponds to a blackboard.

The teacher 54 brings a floppy disk containing educational software for teachers, and inserts the floppy disk into the disk drive of the laptop computer 53 before starting class. The class proceeds according to the contents of the educational software, and the contents that the teacher 54 and the students 51 etc. need to see together are displayed on the laptop computer 53 and the display screen 55, and the information that the students 51 do not want to see (exercises) is displayed on the laptop computer 53 and the display screen 55. Answers, teaching techniques, such as telling a joke like this here and there) are programmed to be displayed only on the laptop computer 53. The teacher 54 does not have to take his eyes off the students 51 and the like when reading the displayed content, and can proceed with the lesson while watching the reactions of the students, so that he can conduct an effective lesson.

As the light beam coupling element used in the above embodiments, in addition to volume phase diffraction gratings and relief gratings, various devices having similar functions can be used. In addition to the reflective type, a transmissive type can also be used.

FIG. 6 is a schematic diagram showing a third embodiment of the present invention.

This embodiment shows a configuration using a transmission type light beam coupling element. In the figure, 62 is a display element such as a CRT;
60 is a laptop computer, and 64 is a transparent substrate. The information entered manually from the keyboard of the laptop computer 60 or displayed on the floppy disk can be
An intermediate image 65 is displayed on the RT 62 and formed by an imaging lens 63.
image.

The beam coupling element 66 is a transmission type total reflection hologram (
Something similar is disclosed in US Pat. No. 4,309,070. ) The light beam guided through the transparent substrate 64 through repeated total reflections is emitted into the air only after reaching the light beam coupling element 66. At this time, a virtual image (display information) 67 is displayed superimposed on the person 68 to be observed.

In this embodiment, since the light beam is guided through the transparent substrate 64 by total reflection, the dimension in the depth direction of the laptop computer 60 can be made considerably shorter than that in the embodiment shown in FIG.

Furthermore, in this embodiment, even when the observation eye 69 is placed very close to the transparent substrate 64, an aerial image 67 with sufficiently corrected aberrations can be generated at a sufficiently far distance. It can be placed even in a small space.

Moreover, similar to the embodiments shown in FIGS. 1 and 3, information that you do not want to show to the other party while looking closely at the other party's face (for example, the other party's ID number, name, privacy matters, criminal history, whether or not he or she is wanted, etc.) It is possible to read
Its practical effects are significant. The hologram 66 used here may be an amplitude type hologram using a silver salt photosensitive material in addition to a polyvinyl carbazole recording material, or a Brine hologram obtained by whitening this silver salt hologram by seven votes. Accordingly, it is easily achieved that the amount of reflected diffracted light 9 is 3% or less, preferably 1% or less, of the light 65 incident on the hologram.

(Effects of the Invention) According to the present invention, by using a volume phase hologram or the like as a beam coupling element and deflecting only a beam of a specific wavelength toward an observer, it is possible to increase the distance from or approach the observed person (object). Even if the displayed information is not read by the observed person (other party), it is possible to match the displayed information with the observed person's face and behavior.
A display system that can be observed within the field of view can be achieved.

In particular, if this display system is used at a bank counter, conference room, school classroom, etc., display information that you do not want the other party to know while observing the reaction of the other person (in the case of a classroom, students) (without taking your eyes off the other person). Since information can be read, it has advantages such as crime prevention and effective lessons.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention, and FIG.
A>, (B) is an explanatory diagram showing a method of manufacturing a beam coupling element according to the present invention, FIG. 3 is a schematic diagram showing a second embodiment of the present invention, and FIG. 4 is a schematic diagram showing the embodiment of FIG. FIG. 5 is a schematic diagram showing the actual hK example in FIG. 3 being used in a classroom lesson. FIG. 6 is a schematic diagram showing the actual hK example in FIG. FIG. 7 is a schematic diagram showing an example of a conventional head-up display device. In the figure, 11 is a light source, 12 is a condenser lens system, 13
14.23 is a display element, 14.23 is an imaging lens, 15.35 is a light beam coupling element, 17.18, 42°64 is a transparent substrate, 40
is an adhesive layer, 13A, 65 is an intermediate image, 13B, 67 is a virtual image (display information), 10.36.69 is an observer, 30, 60
．． 15 is a laptop computer, and 16.68 is an observed person. Patent Applicant: Canon Co., Ltd. Figure 2 (A) 20C Dragon 3 (2) Mo 4 Zukyu 5 7 Mo 6 Zulu 7 Fig.

Claims (3)

[Claims] (1) It has a display means for displaying image information and a light-transmissive light flux coupling element that guides the light flux from the means in a predetermined direction,
The forward field of view is observed by guiding the light beam from the front field of view that has passed straight through the light beam coupling element to the observer, and at the same time, the light flux from the display means is transmitted and deflected by the light flux coupling element and the light beam is reflected and deflected for the observation. A display system for observing the image information by guiding a person, and superimposing and observing the forward field of view and the image information,
The proportion of the amount of light that is deflected by the light beam coupling element and guided to the observer out of the light flux from the display means is larger than the proportion of the light quantity that is deflected by the light flux coupling element and guided to the forward viewing direction. A display system characterized by: (2) The display system according to claim 1, wherein the light beam coupling element has a reflection type or transmission type diffraction grating. (3) The display system according to claim 1, wherein the light beam coupling element has a sawtooth reflecting surface.