JP7137273B2 - Video display device and video display system - Google Patents

Description

The present invention relates to a video display device and a video display system.

2. Description of the Related Art Conventionally, a video display device using a light guide plate typified by a head-mounted display is known.

In relation to the above-described image display device using a light guide plate (hereinafter referred to as a light guide plate method), for example, Patent Document 1 discloses that a directional laser beam is emitted from the tip of a fiber, A technique related to a fiber scanning image generation device that generates an image by scanning is disclosed. According to the fiber scanning image generating apparatus, a projection lens for projecting an image is not required, so that the size of the apparatus can be reduced.

Further, Patent Literature 2 discloses a technique related to a light guide plate that enlarges the pupil size, which is the luminous flux diameter of image light displayed on an image display device, and transmits the image light to the pupil of the user's eye. According to the light guide plate, the eye box (area where the user can visually recognize the image) can be enlarged by enlarging the pupil size.

WO2017/163386 WO2016/020643

By combining the light guide plate described in Patent Document 2 and the fiber scanning image generation device described in Patent Document 1, it is possible to reduce the size of the light guide plate type image display device. However, in the case of such a configuration, the diameter of the exit pupil of the image light supplied to the light guide plate from the fiber scanning image generation device is substantially equal to the diameter of the directional laser light. It is very small compared to the interval of the image light of . Therefore, the plurality of image lights output from the light guide plate do not overlap each other, and the image light does not enter the pupil of the user's eye, and the user may not be able to see at least part of the image. It can happen.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide plate type image display device that allows a user to visually recognize an entire image.

The present application includes a plurality of means for solving at least part of the above problems, and examples thereof are as follows. In order to solve the above problems, an image display device according to an aspect of the present invention includes an image projection unit that scans light to generate image light with a predetermined angle of view, and an image light that has entered from an optical input unit. and an image light duplicating unit for duplicating the ray of the image light, wherein the image light duplicating unit has substantially the same angle of view as the incident image light. It is characterized by duplicating two or more image lights that it has.

According to the present invention, it is possible to realize a light guide plate type image display device that allows a user to visually recognize the entire image.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a block diagram showing a configuration example of a video display system according to an embodiment of the invention; FIG. 1 is a block diagram showing a first configuration example of a video display device; FIG. FIG. 3 is a diagram showing an example of a video generation device that can be employed in a video projection unit; FIG. 4 is a diagram for explaining propagation of image light in a light guide plate; FIG. 4 is a diagram showing an example of diffraction directions of image light by a light guide plate; FIG. 4 is a cross-sectional view showing a first configuration example of an image light duplicator in the first configuration example of the image display device; FIG. 4 is a cross-sectional view showing a second configuration example of an image light duplicator in the first configuration example of the image display device; FIG. 11 is a cross-sectional view showing a third configuration example of an image light replication unit in the first configuration example of the image display device; FIG. 11 is a block diagram showing a second configuration example of the image display device; FIG. 10 is a cross-sectional view showing a first configuration example of a light guide plate including a video light duplicator in a second configuration example of the image display device; FIG. 11 is a cross-sectional view showing a second configuration example of a light guide plate including a video light duplicator in the second configuration example of the video display device; FIG. 11 is a cross-sectional view showing a third configuration example of a light guide plate including a video light duplicator in the second configuration example of the image display device; FIG. 11 is a cross-sectional view showing a fourth configuration example of the light guide plate including the image light duplicator in the second configuration example of the image display device; FIG. 11 is a block diagram showing a third configuration example of the video display device; FIG. 11 is a cross-sectional view showing a configuration example of a light guide plate to which a video light duplicator is bonded in a third configuration example of the video display device; FIG. 10 is a cross-sectional view showing a first modification of the first configuration example of the image display device; FIG. 11 is a cross-sectional view showing a second modification of the first configuration example of the image display device; FIG. 11 is a cross-sectional view showing a modification of the second configuration example of the image display device;

A plurality of embodiments according to the present invention will be described below with reference to the drawings. In principle, the same members are denoted by the same reference numerals in all the drawings for explaining each embodiment, and repeated description thereof will be omitted. In addition, in the following embodiments, the constituent elements (including element steps, etc.) are not necessarily essential, unless otherwise specified or clearly considered essential in principle. Needless to say. In addition, when saying "consisting of A", "consisting of A", "having A", or "including A", other elements are excluded unless it is explicitly stated that only those elements are included. It goes without saying that it is not something to do. Similarly, in the following embodiments, when referring to the shape, positional relationship, etc. of components, etc., unless otherwise specified or in principle clearly considered otherwise, the shape is substantially the same. It shall include things that are similar or similar to, etc.

<Configuration Example of Image Display System According to One Embodiment of the Present Invention>
FIG. 1 shows a configuration example of a video display system according to one embodiment of the present invention.

The video display system 10 has a video display device 11 , a control device 12 , a video signal processing device 13 , a power supply device 14 , a storage device 15 , a sensing device 16 , a communication device 18 and an audio processing device 20 .

The image display device 11 is a display device of a light guide plate type using a light guide plate represented by, for example, a head-mounted display. The video display device 11 receives a video signal generated by the video signal processing device 13 and supplied via the control device 12, and displays a video image based on the video signal to the user. Details of the image display device 11 will be described later.

The control device 12 centrally controls the entire video display system 10 . The control device 12 can realize its functions by executing a predetermined program by, for example, a CPU (Central Processing Unit), a computer, or the like.

The video signal processing device 13 generates video signals to be supplied to the video display device 11 . The power supply device 14 supplies power to each device that configures the image display system 10 .

The storage device 15 stores programs executed by the control device 12, information necessary for processing of each device constituting the video display system 10, information generated by each device, and the like. The storage device 15 includes, for example, RAM (Random Access Memory), flash memory, HDD (Hard Disk Drive), SSD (solid state drive), CD-R (Compact Disc-Recordable), DVD-RAM (Digital Versatile Disk-Random Access Memory). Memory) or other writable and readable storage media or a storage media drive device.

The sensing device 16 detects surrounding conditions using sensors connected via the sensor input/output unit 17 . The sensors include, for example, a tilt sensor that detects the user's posture, orientation, and movement, an acceleration sensor, a line-of-sight sensor that detects the user's physical condition, a temperature sensor, and a GPS (Global Positioning System) that detects the user's position information. A receiver, a pressure sensor, a capacitance sensor, a bar code reader, etc. can be mentioned.

The communication device 18 performs wireless communication using, for example, Bluetooth (registered trademark), Wi-Fi (registered trademark), UHF (Ultra-High Frequency) waves, VHF (Very High Frequency) waves, etc., via the communication input/output unit 19. Alternatively, communication is performed by connecting to a predetermined communication network (mobile phone communication network, Internet, etc.) using wired communication.

The audio processing device 20 is connected to a microphone, an earphone, or the like via an audio input/output unit 21 to input/output audio signals.

<First Configuration Example of Image Display Device 11>
Next, FIG. 2 shows an image display device 101 as a first configuration example of the image display device 11. As shown in FIG.

The image display device 101 comprises an image projection section 200 , an image light replication section 210 and a light guide plate 220 .

The video projection unit 200 receives a video signal generated by the video signal processing device 13 and supplied via the control device 12, and based on the video signal, generates video light to be displayed by the video display device 11. and projected to the later stage. In the case of the figure, the image light projected by the image projection unit 200 is incident on the image light replication unit 210 .

FIG. 3 shows an example of an image generation device that can be employed in the image projection unit 200. As shown in FIG. FIG. 2A shows a fiber scanning projector 201 that can be used in the image projection unit 200. FIG. FIG. 2B shows a mirror scanning projector 202 that can be employed in the image projection unit 200. As shown in FIG.

A fiber-scanning projector 201 shown in FIG. 1A includes a light source unit 900 , a fiber 901 , a fiber scanning element 902 and a collimating lens 903 .

The light source unit 900 emits laser light, for example. A laser beam emitted by the light source unit 900 propagates inside the fiber 901 and is emitted from the end surface 904 of the fiber 901 . Light emitted from the fiber 901 becomes light having high directivity by passing through the collimating lens 903 .

A fiber scanning element 902 attached to the fiber 901 vibrates the end surface 904 of the fiber 901 to scan the emitted light from the fiber 901 . The fiber scanning projector 201 can project an image by synchronizing the intensity of the laser light output by the light source unit 900 and the vibration of the end face 904 by the fiber scanning element 902 with the image signal.

A mirror scanning projector 202 shown in FIG.

The scanning element 911 has a scanning mirror (not shown). The laser light output from the light source unit 900 has directivity, and the laser light is incident on the scanning mirror of the scanning element 911 and reflected. At this time, the reflected light can be scanned by the scanning element 911 vibrating the scanning mirror. By synchronizing the intensity of the laser light output by the light source unit 900 and the vibration of the scanning element 911 with the image signal, the mirror scanning projector 202 can project an image.

Return to FIG. The image light duplicator 210 duplicates two or more rays of the image light while substantially preserving the angle of view of the incident image light, and outputs the duplicated two or more image lights to the light guide plate 220 . The details of the image light duplication unit 210 will be described later.

The light guide plate 220 has a light input portion 221 into which the image light from the image light replicating portion 210 is incident, and a light output portion 222 from which the image light is emitted to the user's eyes.

Next, FIG. 4 is a diagram for explaining propagation of image light in the light guide plate 220. As shown in FIG.

The image light k from the image light replication unit 210 enters the light guide plate 220 from the light input unit 221 (upper surface in the figure), and is reflected on the inner reflecting surfaces 223 and 224 facing each other parallel to the xz plane of the light guide plate 220. It propagates inside the light guide plate 220 by reflection.

The light guide plate 220 has a function of enlarging the pupil size, which is the luminous flux diameter of the image light displayed by the image display device 101, and duplicates the image light k incident on the light guide plate 220 from the light input section 221 into a plurality of pieces. and output from the light output section 222 (bottom surface in the drawing). As a result, image light having a pupil size φ2 larger than the pupil size φ1, which is the luminous flux diameter of the image light k incident on the light guide plate 220 from the light input unit 221 (in the case of FIG. 3, three duplicated image light k). can be output from the optical output unit 222 .

Next, FIG. 5 is a diagram showing an example of the light guide plate 220. As shown in FIG. It should be noted that illustration of the image light replication unit 210 provided between the image projection unit 200 and the light guide plate 220 is omitted in FIG.

A light guide plate 801, which is an example of the light guide plate 220 shown in FIG.

The diffraction area 802 has a structure that diffracts light substantially parallel to the y-axis in a direction substantially parallel to the z-axis. The diffraction region 803 has a structure that diffracts light substantially parallel to the z-axis in the xz-plane in a direction substantially parallel to the x-axis. The diffraction area 804 has a structure that diffracts light substantially parallel to the x-axis in a direction substantially parallel to the y-axis. The pitches of the diffraction structures of the diffraction regions 802 and 804 are substantially equal to each other, and the pitch of the diffraction structures of the diffraction region 803 is substantially equal to 1/√2 times the pitch of the diffraction structure of the diffraction region 802 .

In the light guide plate 801 , image light from the image projection section 200 enters a diffraction area 802 corresponding to the light input section 221 . The image light incident on the diffraction area 802 is diffracted, taken into the light guide plate 801 , guided through total reflection inside the light guide plate 801 , and reaches the diffraction area 803 . Part of the image light reaching the diffraction area 803 is diffracted by the diffraction area 803 , and the image light not diffracted is totally reflected inside the light guide plate 801 and reaches the diffraction area 803 again. Then, the image light is replicated in a plurality of times each time it reaches the diffraction area 803 , and the replicated image light is totally reflected and guided inside the light guide plate 801 and reaches the diffraction area 804 corresponding to the light output section 222 .

Part of the image light reaching the diffraction area 804 is diffracted by the diffraction area 804 , and the image light not diffracted is totally reflected inside the light guide plate 801 and reaches the diffraction area 804 again. Then, every time the image light reaches the diffraction area 804 , the image light is duplicated into a plurality of copies and emitted from the light guide plate 801 .

Therefore, according to the light guide plate 801, the pupil size, which is the luminous flux diameter of the image light, can be expanded in the two-dimensional direction. Although the light guide plate 801 has three diffraction regions 802 to 804, for example, two diffraction regions may be provided in the light guide plate, and the directions and periods (pitch) of the diffraction structures of the two diffraction regions may be substantially the same. . Thereby, the structure of the light guide plate can be simplified, and the cost of the light guide plate can be reduced.

Next, a light guide plate 811, which is an example of the light guide plate 220 shown in FIG.

The diffraction region 812 has a structure that diffracts light substantially parallel to the y-axis in a direction substantially parallel to the x-axis within the xz plane. The diffraction region 813 has a structure that diffracts light approximately parallel to the x-axis in two directions of approximately 60 degrees and −60 degrees counterclockwise from the x-axis on the xz plane. The pitches of the diffraction structures in the diffraction region 812 and the pitches of the diffraction structures in the two directions in the diffraction region 813 are all substantially equal to each other.

In the light guide plate 811 , image light from the image projection section 200 enters a diffraction area 812 corresponding to the light input section 221 . The image light incident on the diffraction area 812 is diffracted, taken into the light guide plate 811 , is totally reflected and guided inside the light guide plate 811 , and reaches the diffraction area 813 corresponding to the light output section 222 . The diffraction area 813 has a structure that diffracts the image light in two directions. Image light is emitted from the light guide plate 811 .

Therefore, the light guide plate 811 can also enlarge the pupil size, which is the luminous flux diameter of the image light, in the two-dimensional direction.

Next, a light guide plate 821, which is an example of the light guide plate 220 shown in FIG.

The plurality of partially reflecting surfaces 823 are a plurality of beam splitter surfaces that are parallel to each other, reflect at least part of the incident light, and transmit the rest.

In the light guide plate 821 , image light from the image projection section 200 is incident on an incident surface 822 corresponding to the light input section 221 . The image light incident on the entrance surface 822 is guided by total reflection inside the light guide plate 821 and reaches a plurality of partial reflection surfaces 823 . Image light is emitted from the light output surface 824 corresponding to the light output section 222 by reflecting the image light on each of the beam splitter surfaces constituting the plurality of partially reflecting surfaces 823 .

Therefore, according to the light guide plate 821, it is possible to expand the pupil size, which is the luminous flux diameter of the image light, in the one-dimensional direction.

As described above, part of the image light emitted from the light guide plates 801 , 811 and 821 enters the user's eye 120 . By perceiving the light incident on the eyes 120, the user can visually recognize the image displayed by the image display device 101. FIG.

Note that the pupil size φ2 ( FIG. 4 ) of the image light output from the light output unit 222 of the light guide plate 220 is the pupil size of the image light incident on the light guide plate 220 due to the pupil size enlarging function of the light guide plate 220 . φ1 (FIG. 4). This makes it possible to widen the area (eyebox) in which the user can visually recognize the image when the user's eye 120 moves.

However, the image projection unit 200 employs an image generation device that scans directional light (laser light) to generate an image, such as the fiber scanning projector 201 and the mirror scanning projector 202 shown in FIG. In this case, the exit pupil diameter of the image light is approximately equal to the diameter of the directional light, which is about 0.1 to 2.0 mm.

Since the exit pupil diameter of the image light, which is about 0.1 to 2.0 mm, is smaller than the distance of about 2 mm to 8 mm between the plurality of image light beams output from the light guide plate 220, the plurality of image light beams output from the light guide plate 220 have a diameter of about 0.1 to 2.0 mm. When the lights do not overlap each other and the user's eyes are positioned between a plurality of image lights, there is a case where no or little image light enters the pupil of the user's eye. In this case, the user may not be able to see at least a portion of the video, or a portion of the video may appear significantly darker.

In order to prevent such a situation from occurring, the image display device 101 is provided with an image light replicating section 210 between the image projection section 200 and the light guide plate 220 . The image light duplication unit 210 will be described in detail below.

<First Configuration Example of Image Light Duplicator 210>
Next, FIG. 6 is a cross-sectional view showing a first configuration example of the image light replication unit 210 in the image display device 101. As shown in FIG.

A first configuration example of the image light replication unit 210 is composed of an image light replication prism 301 . The image light replication prism 301 is made of a transparent glass material or resin, and has an input surface 302, an output surface 303, and at least two image light splitting surfaces 304 which are approximately flat and approximately parallel to each other. In the case of the figure, the image light replication prism 301 has two image light splitting surfaces 304A and 304B.

In the image light replication prism 301, the image light from the image projection unit 200 enters from the input surface 302 and reaches the image light branch surface 304A. The image light branching surface 304A reflects at least part of the incident light and transmits the rest. Therefore, the image light that has reached and passed through the image light branching surface 304 A is emitted from the output surface 303 . In addition, the image light that reaches and is reflected by the image light branching surface 304A reaches the image light branching surface 304B. The image light branching surface 304B reflects at least part of the light. Therefore, the light that reaches the image light splitting surface 304B and is reflected is emitted from the output surface 303. FIG.

Since the image light splitting surfaces 304A and 304B are both substantially flat surfaces and substantially parallel to each other, the image light replication prism 301 splits two image light beams having substantially the same angle of view as the image light beams incident on the image light replication prism 301. It is possible to copy and output to

Both of the two image lights output by the image light replication prism 301 enter the light input section 221 of the light guide plate 220 . The two image lights that have entered the light input section 221 are duplicated by the function of enlarging the pupil size of the light guide plate 220 and output from the light output section 222 .

The two image lights output by the image light replicating prism 301 are incident on different locations of the light input section 221 of the light guide plate 220 , and are output from different locations of the light output section 222 . Therefore, the gap between the image lights output from the light guide plate 220 is reduced. As a result, the image light enters the pupil of the user's eye, and the user can visually recognize the entire image.

The image light branching surface 304B (the image light branching surface 304 on which the image light reaches last among the plurality of image light branching surfaces 304) desirably reflects all the image light. This makes it possible to improve the light utilization efficiency.

If RA is the energy reflectance (hereinafter abbreviated as reflectance) of the image light branching surface 304A, and RB is the reflectance of the image light branching surface 304B, (1-RA) is approximately equal to RA×RB. It is desirable to form the image light splitting planes 304A and 304B as follows.

In particular, when the image light branching surface 304B totally reflects the image light, that is, when RB=1, it is desirable to set RA=0.5. As a result, the intensities of the two image lights emitted from the image light replication prism 301 become substantially equal to each other, and the image viewed by the user can be made more uniform.

Although the image light replication prism 301 has two image light branching surfaces 304 in the figure, it may have two or more image light branching surfaces 304 . Even when the image light duplicating prism 301 has two or more image light branching surfaces 304, all the image light branching surfaces 304 are formed substantially flat and substantially parallel to each other.

For example, the number of image light branching surfaces 304 is N, and among the N image light branching surfaces 304, the first, second, . In this case, the image light incident from the input surface 302 enters the first image light splitting surface 304 . At least part of the light incident on the first image light branching surface 304 is transmitted through the first image light branching surface 304 and emitted from the output surface 303, and at least part of the light incident on the first image light branching surface 304 Part of it is reflected by the first image light branching surface 304 and enters the second image light branching surface 304 . At least part of the light incident on the k-th image light branching surface 304 is reflected by the k-th image light branching surface 304 and emitted from the output surface 303 for an integer k of 2 or more and (N−1) or less. , at least part of the light incident on the k-th image light branching surface 304 passes through the k-th image light branching surface 304 and enters the (k+1)th image light branching surface 304 . At least part of the light incident on the Nth image light branching surface 304 is reflected by the Nth image light branching surface 304 and emitted from the output surface 303 . As a result, the image light replication prism 301 can replicate and output N image light beams having substantially the same angle of view as the image light beams incident on the image light replication prism 301 .

Further, among the first to Nth image light branching surfaces 304, the reflectance of the first image light branching surface 304 is the highest, and the reflectance of the second to Nth image light branching surfaces 304 is the same as that of the input surface. It is good to configure so that the closer it is, the lower it becomes. Preferably, the reflectance of the first image light branching surface 304 is (N−1)/N, and the reflectance of the k-th image light branching surface 304 is 1 for an integer k of 2 or more and N or less. /(N−k+1). This makes it possible to make the image visually recognized by the user more uniform.

Furthermore, in the image light replicating prism 301, the image light incident on the image light replicating prism 301 from the input surface 302 enters an end surface of the image light replicating prism 301 other than the output surface 303 before entering the image light splitting surface 304. It is desirable to configure it so that it does not. This can prevent stray light from being generated.

Furthermore, the image light duplicating prism 301, before the light reflected by the first image light branching surface 304 is reflected by the second to N image light branching surfaces 304 other than the first image light branching surface 304, It is desirable to configure such that the light does not enter the end face of the image light replicating prism 301 . This can prevent stray light from being generated.

As another image light replication prism 301, the image light replication prism 301 is used so that the light that enters the image light replication prism 301 and is reflected by the first image light splitting surface 304 is emitted from the output surface 303. good too. For example, the image light incident from the input surface 302 enters the first image light splitting surface 304 . At least part of the light incident on the k-th image light branching surface 304 is reflected by the k-th image light branching surface 304 and emitted from the output surface 303 for an integer k of 1 or more (N−1) or less. , at least part of the light incident on the k-th image light branching surface 304 passes through the k-th image light branching surface 304 and enters the (k+1)th image light branching surface 304 . At least part of the light incident on the Nth image light branching surface 304 is reflected by the Nth image light branching surface 304 and emitted from the output surface 303 . This makes it possible to increase the degree of freedom in arrangement. Also, the reflectance of the first to N-th image light splitting surfaces 304 should preferably be configured so that the closer they are to the input surface, the lower the reflectance. Preferably, the reflectance of the k-th image light splitting surface 304 is 1/(N−k+1) for an integer k of 1 or more and N or less. This makes it possible to make the image visually recognized by the user more uniform.

Furthermore, when the image light replication prism 301 has an aperture size of φPJ (not shown) for emitting the image light of the image projection unit 200 and an arrangement interval of the N image light branching surfaces 304 of the image light replication prism 301 is DistP. , DistP should be substantially equal to φPJ or smaller than φPJ. As a result, two or more image light beams output by the image light replicating prism 301 overlap each other, making it possible to make the image visually recognized by the user more uniform.

From another point of view, when the image light replication prism 301 has a function of enlarging the pupil size of the light guide plate 220 and the interval between the plurality of image light beams output from the light guide plate 220 is Dwg (not shown), DistP is It is preferably configured to be approximately equal to 1/N of Dwg or approximately equal to an integral multiple of 1/N of Dwg. As a result, the gap between the image lights output from the light guide plate 220 can be further reduced, and the image visually recognized by the user can be made more uniform.

<Second Configuration Example of Image Light Duplicator 210>
Next, FIG. 7 is a cross-sectional view showing a second configuration example of the image light replication unit 210 in the image display device 101. As shown in FIG.

A second configuration example of the image light replicating section 210 consists of an image light replicating diffraction element 311 . The image light duplicating diffraction element 311 is made of a transparent glass material or resin, and has an input surface 312 and an output surface 313 . Input surface 312 includes a diffractive region 314 that diffracts at least some of the light. Output face 313 comprises a plurality of diffractive regions 315 that diffract at least some of the light. In the same figure, the output face 313 comprises two diffractive regions 315A, 315B.

The direction and period (pitch) of the diffraction structures of the diffraction regions 314 and 315 are substantially the same. In this figure, the groove direction of the diffraction structures of the diffraction regions 314 and 315 is the z-axis direction, and the pitch direction is the x-axis direction.

In the image light replication diffraction element 311 , the image light from the image projection unit 200 is incident on the diffraction area 314 of the input surface 312 . Diffraction region 314 generates 0th order light, 1st order light, and −1st order light. The 0th-order light, the 1st-order light, and the -1st-order light emitted from the diffraction region 314 propagate inside the image light replicating diffraction element 311, respectively. The zero-order light from the diffraction area 314 is output to the light guide plate 220 from the area of the output surface 313 where the diffraction area 315 is not provided. The −1st-order light from the diffraction region 314 reaches the diffraction region 315 A, undergoes 1st-order diffraction, and is output to the light guide plate 220 . The 1st-order light from diffraction region 314 reaches diffraction region 315B, undergoes −1st-order diffraction, and is output to light guide plate 220 .

As described above, the directions and periods (pitch) of the diffraction structures of the diffraction regions 314 and 315 are substantially the same. As a result, the image light duplicating diffraction element 311 can duplicate and output three image light beams having substantially the same angle of view as the image light incident on the image light duplicating diffraction element 311 .

It is desirable that the diffraction efficiencies of the diffraction regions 314 other than the three diffraction orders of the 0th order, the 1st order, and the −1st order be substantially zero. Moreover, it is desirable that both the 1st-order diffraction efficiency of the diffraction region 315A and the −1st-order diffraction efficiency of the diffraction region 315B be approximately 1. Thereby, light utilization efficiency can be improved.

Furthermore, it is desirable that the diffraction efficiencies of the 0th-order diffraction, the 1st-order diffraction, and the −1st-order diffraction of the diffraction region 314 are substantially equal to each other. As a result, the intensities of the three image light beams output from the image light replication diffraction element 311 can be made substantially equal, and the image visually recognized by the user can be made more uniform.

Further, a point that internally divides the center point of the diffraction region 315A and the center point of the diffraction region 315B at a ratio of 1:1, It is desirable that the intersection points are at approximately the same position. As a result, the structure of the image light replicating diffraction element 311 can be simplified, and the cost of the image light replicating diffraction element 311 can be reduced.

From another point of view, the point that internally divides the center point of the image light incident on the diffraction region 315A and the center point of the image light incident on the diffraction region 315B at 1:1 and the image light incident on the diffraction region 314 It is desirable that the intersection of the perpendicular line drawn from the center point of the light to the output surface 313 and the output surface 313 be at substantially the same position. As a result, the structure of the image light replicating diffraction element 311 can be simplified, and the cost of the image light replicating diffraction element 311 can be reduced.

The image light replication diffraction element 311 has an aperture size of φPJ for emitting the image light of the image projection unit 200, and a distance between the center point of the diffraction area 315A and the center point of the diffraction area 315B as DistG1 (both not shown). In this case, DistG1 is preferably approximately twice φPJ or less than approximately twice. As a result, the three image lights output by the image light replication diffraction element 311 overlap with each other, making it possible to make the image visually recognized by the user more uniform.

From another point of view, when the distance between the center point of the image light incident on the diffraction region 315A and the center point of the image light incident on the diffraction region 315B is DistG2 (not shown), DistG2 is approximately 2 of φPJ. It is desirable to be less than double or about double. As a result, the three image lights output by the image light replication diffraction element 311 overlap with each other, making it possible to make the image visually recognized by the user more uniform.

In the above description, the diffraction region 314 outputs three orders of diffracted light, that is, the 0th order, the 1st order, and the −1st order of diffraction. It is also possible to output diffracted light of two orders, such as diffraction orders. Thereby, the structure of the image light replicating diffraction element 311 can be simplified, and the cost of the image light replicating diffraction element 311 can be reduced.

Alternatively, the diffraction region 314 may output N (N is an integer equal to or greater than 2) diffracted light orders such as the 0th order, the 1st order, the −1st order, the 2nd order, and the −2nd order of diffraction. . Where k is an integer, the light diffracted in the diffraction region 314 in the k-th order is diffracted in the diffraction region 315 provided on the output surface 313 in the -k-th order, and is output from the image light replicating diffraction element 311 . As a result, the image light replicating diffraction element 311 can replicate N image light beams having substantially the same angle of view as the image light beams incident on the image light replicating diffraction element 311 and output them. can be made more uniform.

Further, the image light duplicating diffraction element 311 may be configured such that the region of the output surface 313 where the light diffracted by the k-th order in the diffraction region 314 reaches has a diffraction region with high diffraction efficiency for −k-th order diffraction. Furthermore, it is desirable that the area of the output surface 313 where the 0th-order diffracted (not diffracted) light reaches the diffraction area 314 does not have a diffraction area. This makes it possible to increase the light utilization efficiency.

Furthermore, a distance DistG3 (not shown) between adjacent image light beams diffracted by the diffraction region 314 and reaching the output surface 313 is approximately equal to the aperture size φPJ through which the image light beams of the image projection unit 200 are emitted, or φPJ Smaller is desirable. As a result, two or more image light beams output by the image light replicating diffraction element 311 overlap each other, making it possible to make the image visually recognized by the user more uniform.

From another point of view, when Dwg is the interval between a plurality of image light beams output from the light guide plate 220 by the function of enlarging the pupil size of the light guide plate 220, DistG3 is approximately equal to 1/N of Dwg, or Dwg It is preferable to configure the image light replication diffraction element 311 so as to be approximately equal to an integral multiple of 1/N of . As a result, the gap between the image lights output from the light guide plate can be further reduced, and the image visually recognized by the user can be made more uniform.

<Third Configuration Example of Image Light Duplicator 210>
Next, FIG. 8 is a cross-sectional view showing a third configuration example of the image light replication unit 210 in the image display device 101. As shown in FIG.

A third configuration example of the image light replication unit 210 is composed of an image light replication beam splitter 321 . The image light duplicating beam splitter 321 is made of a transparent glass material or resin, and has an input surface 322 and an output surface 323 . The image light duplicating beam splitter 321 is formed such that the angle formed by the output surface 323 and the light input section 221 is greater than 0 degrees, and the input surface 322 and the output surface 323 are parallel to each other.

In the image light replication beam splitter 321 , the image light from the image projection unit 200 enters from the input surface 322 , and at least part of the incident image light propagates inside the image light replication beam splitter 321 . The image light propagated inside the image light replication beam splitter 321 reaches the output surface 323 . Output surface 323 transmits at least some light and reflects at least some light. The light transmitted through the output surface 323 is emitted from the image light replication beam splitter 321 . The light reflected by the output surface 323 propagates inside the image light replication beam splitter 321, reaches the input surface 322, is reflected by the input surface 322, and reaches the output surface 323 again. Each time light incident from the input surface 322 reaches the output surface 323 , image light is emitted from the output surface 323 .

As described above, the input surface 322 and the output surface 323 are formed parallel to each other, so that the image light duplication beam splitter 321 has substantially the same image as the image light incident on the image light duplication beam splitter 321 . It is possible to duplicate and output at least two or more of a plurality of image light beams having corners.

It is desirable that the transmittance of the area of the input surface 322 where the image light from the image projection unit 200 is incident is approximately 1. Thereby, the light utilization efficiency can be increased.

Further, it is desirable that the reflectance of the region of the input surface 322 where the image light reflected by the output surface 323 is incident is approximately 1. Thereby, light utilization efficiency can be improved.

The area in the output surface where the image light incident from the input surface 322 reaches is the first arrival area, k is an integer of 1 or more, and the image light reflected by the input surface 322 is reflected by the k-th arrival area. A region within the output plane that reaches the output plane 323 is defined as a (k+1)-th reaching region. Also, let N be an integer of 2 or more, the output surface 323 has first to N-th arrival areas, and the image light replication beam splitter 321 outputs N image lights. In this case, it is desirable that the reflectance of the k-th reachable area is higher than the reflectance of the (k+1)th reachable area. Preferably, the reflectance of the k-th reaching area is (N−k)/(N−k+1). As a result, the intensities of the image light beams output by the image light duplication beam splitter 321 become substantially equal to each other, so that the image visually recognized by the user can be made more uniform.

From another point of view, the image light replication beam splitter 321 is desirably configured so that at least one of the input surface 322 and the output surface 323 has a substantially uniform reflectance. This makes it possible to reduce the cost of the image light replication beam splitter 321 .

According to the image display device 101 including the image light duplication unit 210 described above, the image projection unit 200 projects an image having a small exit pupil such as the fiber scanning projector 201 or the mirror scanning projector 202 shown in FIG. Even if the generation device is employed, the image light is incident on the pupil of the user's eye, so the user can visually recognize the entire image. In other words, an image generating device with a small exit pupil, such as the fiber scanning projector 201 or the mirror scanning projector 202 shown in FIG. Therefore, the size of the image display device 11 can be reduced.

<Second Configuration Example of Image Display Device>
Next, FIG. 9 shows a video display device 102 as a second configuration example of the video display device 11. As shown in FIG. Among the constituent elements of the image display device 102, those that are common to the constituent elements of the image display device 101 (FIG. 2) are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The image display device 102 comprises an image projection section 200 and a light guide plate 400 . The light guide plate 400 has a light input section 221 , an image light replicating section 230 and a light output section 222 .

In the image display device 102 , image light from the image projection section 200 enters the light guide plate 400 from the light input section 221 , propagates through the light guide plate 400 , and enters the image light replication section 230 . The image light duplicator 230 duplicates and outputs at least two rays of the image light while substantially preserving the angle of view of the incident image light. The image light replicated by the image light replication unit 230 propagates inside the light guide plate 400 and is emitted from the light output unit 222 to the outside of the light guide plate 400 .

<Configuration Example of Light Guide Plate 400 Including Image Light Duplicator 230>
Next, a plurality of configuration examples of the light guide plate 400 including the image light replicating section 230 will be described with reference to FIGS. 10 to 13. FIG.

FIG. 10 is a cross-sectional view showing a first configuration example of the light guide plate 400. As shown in FIG. A light guide plate 410, which is a first structural example of the light guide plate 400, is composed of a light input portion 221, a light output portion 222, and transparent flat plates 401A, 401B, and 402. FIG.

The transparent flat plates 401A and 401B correspond to the image light replicating section 230. FIG. The transparent flat plates 401A, 401B, 402 are each made of a transparent glass material or resin. The transparent flat plate 401A and the transparent flat plate 401B are bonded together by a transparent adhesive or optical contact on a bonding surface 403 parallel to the xz plane. Similarly, the laminated transparent flat plates 401A and 401B and the transparent flat plate 402 are laminated together by a transparent adhesive or optical contact on a laminated surface 404 parallel to the yz plane.

Further, when the thickness of the transparent flat plate 401A is t1, the thickness of the transparent flat plate 401B is t2, and the thickness of the transparent flat plate 402 is tt, the thickness tt of the transparent flat plate 402 is the thickness of the transparent flat plates 401A and 401B. It has a relationship substantially equal to the added value t1+t2.

In the light guide plate 410 , the image light from the image projection unit 200 enters the inside of the light guide plate 410 through the light input unit 221 . The light incident inside the light guide plate 410 propagates inside the transparent flat plate 401 A and reaches the bonding surface 403 . At least a part of the bonding surface 403 reflects at least part of the image light and transmits at least part of the image light. As a result, the image light reaching the bonding surface 403 is duplicated into two depending on whether it is reflected by the bonding surface 403 or transmitted therethrough.

The image light reflected by the bonding surface 403 is totally reflected by the total reflection surface 405A of the transparent flat plate 401A and reaches the bonding surface 403 again. On the other hand, the image light transmitted through the bonding surface 403 is totally reflected by the total reflection surface 405B of the transparent flat plate 401B and reaches the bonding surface 403 again. Each time the image light reaches the bonding surface 403 , it is duplicated into two depending on whether it is reflected by the bonding surface 403 or transmitted therethrough. As a result, the image light incident on the image light duplication unit 230 is duplicated into a plurality of duplicates and reaches the bonding surface 404 . A plurality of image lights that have reached the bonding surface 404 are incident on the transparent flat plate 402 from the image light replicating section 230 and reach the light output section 222 .

A plurality of image lights from the image light duplicator 230 are further duplicated by the function of enlarging the pupil size of the light guide plate 410 and output from different locations of the light output section 222 . Therefore, the gap between the image lights emitted from the light guide plate 410 is reduced. As a result, the image light enters the pupil of the user's eye, and the user can visually recognize the entire image.

When the thickness t1 of the transparent flat plate 401A and the thickness t2 of the transparent flat plate 401B are formed to be substantially equal, it is possible to prevent thinning of the transparent flat plates 401A and 401B and increase the strength of the light guide plate 410. becomes possible. Further, in this case, the image light duplicator 230 can duplicate the image light into two.

Moreover, it is desirable that the reflectance of the bonding surface 403 of the transparent flat plates 401A and 401B is approximately 0.5. This makes it possible to make the intensities of the plurality of light rays output by the image light duplicator 230 substantially equal to each other, thereby making it possible to make the image visually recognized by the user more uniform.

From another point of view, when the relationship between the thickness t1 of the transparent flat plate 401A and the thickness t2 of the transparent flat plate 401B is 0.2≦t2/t1<5, the strength of the light guide plate 410 is not reduced. , the number of image lights output by the image light duplicator 230 can be increased.

For example, when t2/t1=0.5 or t2/t1=2, the image light replicating section 230 can replicate the image light into three beams. As a result, the gap between the image lights emitted from the light guide plate 410 can be further reduced, and the image visually recognized by the user can be made more uniform.

Next, FIG. 11 is a cross-sectional view showing a second configuration example of the light guide plate 400. As shown in FIG. A light guide plate 420, which is a second configuration example of the light guide plate 400, is obtained by adding a transparent flat plate 406 directly below the light input section 221 to the light guide plate 410 (FIG. 10).

The transparent flat plate 406 is made of a transparent glass material or resin. The laminated transparent flat plates 401A and 401B and the transparent flat plate 406 are laminated together by a transparent adhesive or optical contact on a laminated surface 407 parallel to the yz plane.

In the light guide plate 420 , the image light from the image projection unit 200 enters the inside of the light guide plate 420 through the light input unit 221 . The light incident inside the light guide plate 410 propagates inside the transparent flat plate 406 and enters the image light replication section 230 from the bonding surface 407 . Propagation of the image light after entering the image light replicating section 230 is the same as that of the light guide plate 410, so the description thereof will be omitted.

The image light duplicated by the image light duplicating unit 230 is further duplicated by the pupil size enlarging function of the light guide plate 420 and output from different locations of the light output unit 222 . Therefore, the gap between the image lights emitted from the light guide plate 420 is reduced. As a result, the image light enters the pupil of the user's eye, and the user can visually recognize the entire image.

Next, FIG. 12 is a cross-sectional view showing a third configuration example of the light guide plate 400. As shown in FIG. A light guide plate 430 , which is a third structural example of the light guide plate 400 , comprises a light input section 221 , a light output section 222 , a transparent flat plate 441 and a transparent flat plate 442 .

The image light duplicator 230 is implemented by a transparent flat plate 441 and part of the transparent flat plate 442 .

The transparent flat plate 441 and the transparent flat plate 442 are bonded together by a transparent adhesive or optical contact on a bonding surface 443 parallel to the xz plane. At least part of the bonding surface 443 reflects at least part of the image light and transmits at least part of the image light.

In light guide plate 430 , image light from image projection unit 200 enters light guide plate 440 from light input unit 221 and reaches bonding surface 443 . On the bonding surface 443, two copies are made depending on whether the image light is reflected or transmitted. As a result, the image light incident on the image light duplicator 230 is duplicated. A plurality of image lights output from the image light duplicator 230 are duplicated by the pupil size enlarging function of the light guide plate 430 and output from different locations of the light output section 222 . Therefore, the gap between the image lights output from the light guide plate 430 is reduced. As a result, the image light enters the pupil of the user's eye, and the user can visually recognize the entire image.

In the light guide plates 410, 420, and 430 described above, the image light replication section 230 is formed by two transparent flat plates, but the image light replication section 230 may be formed by two or more transparent flat plates.

Next, FIG. 13 is a cross-sectional view showing a fourth configuration example of the light guide plate 400. As shown in FIG. A light guide plate 440, which is a fourth structural example of the light guide plate 400, comprises a light input portion 221, a light output portion 222, a transparent flat plate 402, and three transparent flat plates 421A to 421C.

The image light replication unit 230 is implemented by three transparent flat plates 421A-421C. The transparent flat plates 421A and 421B forming the image light duplicating unit 230 are bonded at a bonding surface 423A parallel to the xz plane, and the transparent flat plates 421B and 421C are bonded at a bonding surface 423B parallel to the xz plane. Bonded by adhesive or optical contact. The bonded transparent flat plates 421A to 421C and the transparent flat plate 402 are bonded together by a transparent adhesive or optical contact on a bonding surface 424 parallel to the yz plane.

When the thickness of the transparent flat plate 421A is t1, the thickness of the transparent flat plate 421B is t2, the thickness of the transparent flat plate 421C is t3, and the thickness of the transparent flat plate 402 is tt, the thickness tt of the transparent flat plate 402 is equal to the thickness of the transparent flat plate. It is substantially equal to the added value t1+t2+t3 of the thicknesses of 421A, 421B and 421C.

At least a portion of each of the bonding surfaces 423A and 423B reflects at least a portion of the image light and transmits at least a portion of the image light.

By increasing the number of transparent plates forming the image light duplicating unit 230, the number of image light beams duplicated by the image light duplicating unit 230 can be increased. As a result, the gap between the image lights output from the light guide plate 440 can be further reduced, and the image visually recognized by the user can be made more uniform.

According to the image display device 102 including any one of the light guide plates 410 to 440 described above, in addition to the effects and effects that the image display device 101 described above can obtain, Since no optical components are required, the image display device 11 can be made more compact.

<Third Configuration Example of Image Display Device>
Next, FIG. 14 shows a video display device 103 which is a third structural example of the video display device 11. As shown in FIG. Among the constituent elements of the image display device 103, those that are common to the constituent elements of the image display device 101 (FIG. 2) are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The image display device 103 comprises an image projection section 200 , an image light replication section 250 and a light guide plate 700 . The image light duplicator 250 is bonded to the light guide plate 700 with a transparent adhesive or optical contact.

The light guide plate 700 has a light input portion 221 , a total reflection light guide portion 240 and a light output portion 222 .

In the image display device 103 , the image light from the image projection unit 200 enters the light guide plate 700 through the light input unit 221 and is totally reflected and guided by the total reflection light guide unit 240 . Then, the image light propagates to the image light replicating section 250 in the process of total reflection guiding. The image light duplicating unit 250 duplicates and outputs at least two or more while substantially preserving the angle of view of the propagating image light. The image light output from the image light replication unit 250 is again incident on the total reflection light guide unit 240 and is totally reflected and guided. The image light emitted from the total reflection light guide section 240 is emitted from the light output section 222 to the outside of the light guide plate 700 .

FIG. 15 is a cross-sectional view showing a configuration example of the light guide plate 700 to which the image light replicating section 250 is attached.

The image light duplicator 250 consists of a transparent flat plate 431A made of a transparent glass material or resin. The total reflection light guide section 240 is composed of a transparent flat plate 432 made of a transparent glass material or resin.

The transparent flat plate 431A and the transparent flat plate 432 are bonded together by a transparent adhesive or optical contact on a bonding surface 433 parallel to the xz plane.

In the light guide plate 700, the image light from the image projection unit 200 enters the inside of the light guide plate 700 from the light input unit 221, and is totally reflected and guided inside the transparent flat plate 432 (total reflection light guide unit 240). The image light reaches the bonding surface 433 in the process of being totally reflected and guided inside the transparent flat plate 432 . At least a portion of the bonding surface 433 transmits at least a portion of the image light and reflects at least a portion of the light. The image light transmitted through the bonding surface 433 is totally reflected and guided inside the transparent flat plate 431 and reaches the bonding surface 433 again. On the other hand, the image light reflected by the bonding surface 433 is totally reflected and guided inside the transparent flat plate 432 and reaches the bonding surface 433 again. Therefore, the image light is duplicated each time it reaches the bonding surface 433, and thus the image light duplicator 250 can output a plurality of image lights.

A plurality of image lights output by the image light duplicator 250 are duplicated by the pupil size enlarging function of the light guide plate 700 and output from different locations of the light output section 222 . Therefore, the gap between the image lights output from the light guide plate 700 is reduced. As a result, the image light enters the pupil of the user's eye, and the user can visually recognize the entire image.

The thickness t1 of the transparent flat plate 431A and the thickness t2 of the transparent flat plate 432 are formed so as to satisfy the relationship of t1<t2. As a result, the distance of one round trip of total reflection inside the transparent flat plate 431A is shortened, the number of copies of the image light by the image light duplicator 250 can be increased, and the image viewed by the user can be made more uniform. becomes.

According to the image display device 103 including the light guide plate 700 described above, in addition to the effects and effects of the image display device 101 described above, the optical components arranged between the image projection unit 200 and the light guide plate 700 are Since it becomes unnecessary, the image display device 11 can be made more compact.

<First Modification of Image Display Device 101>
Next, a first modified example of the image display device 101, which is a first configuration example of the image display device 11, will be described. As shown in FIGS. 6 to 8, the above-described image display device 101 replicates the image light from the image projection unit 200 in the image light replication unit 210 so that it is incident on one light guide plate 220. However, the plurality of image lights duplicated by the image light duplicator 210 may be transformed so as to be incident on the plurality of light guide plates 220 .

FIG. 16 shows a first modification of the image display device 101. As shown in FIG. The first modification includes three light guide plates 220A, 220B, and 220C stacked in the y-axis direction.

The light input portion 221A of the light guide plate 220A takes in at least part of the image light incident from the image light duplication portion 210 into the light guide plate 220A and transmits at least part of it. The light input portion 221B of the light guide plate 220B takes in at least part of the image light transmitted through the light input portion 221A into the light guide plate 220B and transmits at least part of it. The light input portion 221C of the light guide plate 220C takes in at least part of the image light transmitted through the light input portion 221B into the light guide plate 220C.

The light guide plates 220A to 220C are designed to have characteristics of propagating light of different wavelengths. For example, the light guide plate 220A has the characteristic of propagating light in the blue band, the light guide plate 220B has the characteristic of propagating light in the green band, and the light guide plate 220C has the characteristic of propagating light in the red band. let me have

Accordingly, the image light can be propagated through any one of the light guide plates 220A to 220C according to the color of the image light. Furthermore, since the wavelength of the image light propagating through each of the light guide plates 220A to 220C can be made narrow band, by optimizing the configuration of each light guide plate 220 to the wavelength of the light propagating, optical efficiency such as light utilization efficiency can be improved. It is possible to improve the characteristics.

<Second Modification of Image Display Device 101>
Next, a second modification of the image display device 101, which is the first configuration example of the image display device 11, will be described. In the image display device 101 described above, as shown in FIGS. 6 to 8, the image light from the image projection unit 200 is replicated in the one-dimensional direction (x-axis direction) by the image light replication unit 210 and guided. Although it is designed to be incident on the light plate 220 , the image light replicating unit 210 may replicate the image light in two-dimensional directions (x-axis direction and y-axis direction) and transform the image light so that it is incident on the light guide plate 220 .

FIG. 17 shows a second modification of the video display device 101. FIG. 17A is a cross-sectional view of the second modification in the xy plane, and FIG. 2 is a cross-sectional view of the yz plane of the modification of No. 2. FIG.

The image light replicating section 210 in the second modification consists of image light replicating prisms 301A and 301B. The image light replication prism 301A replicates the image light from the image projection unit 200 in the x-axis direction and outputs it to the image light replication prism 301B. The image light duplicating prism 301B duplicates the image light from the image light duplicating prism 301A in the z-axis direction and enters the light guide plate 220 from the light input section 221 .

Therefore, in the second modified example, the image light from the image projection unit 200 can be two-dimensionally duplicated by the image light duplication unit 210 before entering the light guide plate 220 . As a result, the gap between the image lights emitted from the light guide plate 220 can be further reduced, and the image visually recognized by the user can be made more uniform.

In addition, in the second modification shown in FIG. 17, the image light duplication unit 210 is composed of the two image light duplication prisms 301A and 301B. It may be composed of an image light replication diffraction element 311 (FIG. 7) or two image light replication beam splitters 321 (FIG. 8).

<Modified Example of Image Display Device 102>
Next, a modification of the image display device 102, which is a second configuration example of the image display device 11, will be described. As shown in FIGS. 10 to 13, the image display device 102 described above has the image light from the image projection unit 200 incident on one light guide plate 400. However, the image light from the image projection unit 200 Image light may be incident on a plurality of light guide plates 400 .

FIG. 18 shows a modification of the image display device 102. As shown in FIG. The modified example includes three light guide plates 400A, 400B, and 400C stacked in the y-axis direction.

The light input unit 221A of the light guide plate 400A takes in at least part of the image light from the image projection unit 200 into the light guide plate 400A and transmits at least part of it. The light input portion 221B of the light guide plate 400B takes in at least part of the image light transmitted through the light input portion 221A into the light guide plate 400B and transmits at least part of it. The light input portion 221C of the light guide plate 400C takes in at least part of the image light transmitted through the light input portion 221B into the light guide plate 400C.

The light guide plates 400A to 400C are designed to have characteristics of propagating light of different wavelengths. For example, the light guide plate 400A has the characteristic of propagating light in the blue band, the light guide plate 400B has the characteristic of propagating light in the green band, and the light guide plate 400C has the characteristic of propagating light in the red band. let me have

This makes it possible to propagate the image light through one of the light guide plates 400A to 400C according to the color of the image light. Furthermore, since the wavelength of the image light propagating through each of the light guide plates 400A to 400C can be made narrow band, by optimizing the configuration of each light guide plate 400 for the wavelength of the light propagating, optical efficiency such as light utilization efficiency can be improved. It is possible to improve the characteristics.

Note that the effects described in this specification are merely examples and are not limited, and other effects may be provided.

The present invention is not limited to the above-described embodiments, and includes various modifications. For example, each of the above-described embodiments has been described in detail in order to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the described components. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

DESCRIPTION OF SYMBOLS 10... Video display system 11... Video display apparatus 12... Control apparatus 13... Video signal processing apparatus 14... Power supply apparatus 15... Storage device 16... Sensing device 17 Sensor input/output unit 18 Communication device 19 Communication input/output unit 20 Voice processing unit 21 Voice input/output unit 101 to 104・Image display device 120 Eyes 200 Image projection unit 201 Fiber scanning projector 202 Mirror scanning projector 210 Image light replication unit 220 Light guide plate 220 Light guide plate 221 Light input section 222 Light output section 223 Inner reflecting surface 224 Inner reflecting surface 230 Image light duplication Section 240 Total reflection light guide section 250 Image light replication section 301 Image light replication prism 302 Input surface 303 Output surface 304 Image light Splitting surface 311 Image light replicating diffraction element 312 Input surface 313 Output surface 314 Diffraction area 315 Diffraction area 315A Diffraction area 315B Diffraction region 321 Image light replication beam splitter 322 Input surface 323 Output surface 400 Light guide plate 401 Transparent flat plate 402 Transparent flat plate 403 ... bonding surface 404 ... bonding surface 405 ... total reflection surface 406 ... transparent flat plate 407 ... bonding surface 410 ... light guide plate 420 ... Light guide plate 421 Image light duplicator 421 Transparent flat plate 423 Bonding surface 424 Bonding surface 430 Light guide plate 431 Transparent flat plate 431 432 Transparent flat plate 433 Bonding surface 440 Light guide plate 441 Transparent flat plate 442 Transparent flat plate 443 Bonding Surface 700... Light guide plate 801... Light guide plate 802... Diffraction area 803... Diffraction area 804... Diffraction area 811... Light guide plate 812... Diffraction area , 813... diffraction area, 821... light guide plate, 822... entrance surface, 823... partial reflection surface, 824... light output surface, 900... light source section, 901... fiber , 902... fiber scanning element, 903... collimating lens, 904... end surface, 911... scanning element

Claims (10)

an image projection unit that scans light to generate image light with a predetermined angle of view;
a light guide plate that internally propagates the image light incident from the light input portion and outputs the image light from the light output portion;
an image light replicating unit that replicates the rays of the image light from the image projection unit and outputs them to the light input unit of the light guide plate;
with
The image light duplication unit is
an input surface on which the image light from the image projection unit is incident;
An image light replicating prism having a plurality of parallel image light branching surfaces that reflect the incident image light or reflect a part of the image light and transmit the rest of the image light,
duplicating a plurality of image lights having substantially the same angle of view as the incident image light and outputting them to the light guide plate;
An arrangement interval DistP of the plurality of image light branching surfaces is substantially equal to an aperture size φPJ of the image light from the image projection unit.
An image display device characterized by: The video display device according to claim 1,
The image display device, wherein the reflectance of the plurality of image light branching surfaces is lower toward the input surface, except for the image light branching surface closest to the input surface. The video display device according to claim 1,
In the image light replicating unit, the arrangement interval DistP of the plurality of image light branching surfaces is approximately equal to 1/N of the interval Dwg between the plurality of image light beams output from the light guide plate, or an integral multiple of 1/N. An image display device characterized by: an image projection unit that scans light to generate image light with a predetermined angle of view;
a light guide plate that internally propagates the image light incident from the light input portion and outputs the image light from the light output portion;
an image light replicating unit that replicates the rays of the image light from the image projection unit and outputs them to the light input unit of the light guide plate;
with
The image light duplication unit is
an input surface including a diffraction area that diffracts the image light incident from the image projection unit;
an image light replicating diffraction element having an output surface comprising a plurality of diffraction regions for diffracting the image light diffracted by the diffraction regions of the input surface;
the directions and periods of the diffraction structures of the diffraction regions on the input surface and the diffraction regions on the output surface are substantially the same;
duplicating a plurality of image lights having substantially the same angle of view as the incident image light and outputting them to the light guide plate;
An interval between the plurality of image lights output to the light guide plate is substantially equal to an aperture size φPJ of the image light from the image projection unit.
An image display device characterized by: The image display device according to any one of claims 1 to 4 ,
The image display device, wherein the image projection unit is composed of a fiber scanning projector. The image display device according to any one of claims 1 to 4 ,
An image display device, wherein the image projection unit is a mirror scanning projector. The image display device according to any one of claims 1 to 6 ,
The light guide plate has a plurality of diffraction areas,
The image display device, wherein the light input section and the light output section are each one of the plurality of diffraction areas. In the image display device according to any one of claims 1 to 6 ,
The light guide plate is
an incident surface corresponding to the light input section;
a plurality of partially reflecting surfaces arranged substantially parallel,
An image display device, wherein each of the plurality of partially reflecting surfaces reflects at least part of the image light incident from the incident surface and transmits the rest of the image light. a video signal processing device that generates a video signal;
a video display device that displays a video based on the video signal;
with
The video display device
a video projection unit that scans light based on the video signal to generate video light with a predetermined angle of view;
a light guide plate that internally propagates the image light incident from the light input portion and outputs the image light from the light output portion;
an image light replicating unit that replicates the light beam of the image light from the image projection unit and outputs the image light to the light input unit of the light guide plate;
The image light duplication unit is
an input surface on which the image light from the image projection unit is incident;
An image light replicating prism having a plurality of parallel image light branching surfaces that reflect the incident image light or reflect a part of the image light and transmit the rest of the image light,
duplicating a plurality of image lights having substantially the same angle of view as the incident image light and outputting them to the light guide plate;
An arrangement interval DistP of the plurality of image light branching surfaces is substantially equal to an aperture size φPJ of the image light from the image projection unit.
An image display system characterized by: a video signal processing device that generates a video signal;
a video display device that displays a video based on the video signal;
with
The video display device
an image projection unit that scans light to generate image light with a predetermined angle of view;
a light guide plate that internally propagates the image light incident from the light input portion and outputs the image light from the light output portion;
an image light replicating unit that replicates the light beam of the image light from the image projection unit and outputs the image light to the light input unit of the light guide plate;
The image light duplication unit is
an input surface including a diffraction area that diffracts the image light incident from the image projection unit;
an image light replicating diffraction element having an output surface comprising a plurality of diffraction regions for diffracting the image light diffracted by the diffraction regions of the input surface;
the directions and periods of the diffraction structures of the diffraction regions on the input surface and the diffraction regions on the output surface are substantially the same;
duplicating a plurality of image lights having substantially the same angle of view as the incident image light and outputting them to the light guide plate;
An interval between the plurality of image lights output to the light guide plate is substantially equal to an aperture size φPJ of the image light from the image projection unit.
An image display system characterized by:

Images