WO2013027433A1

WO2013027433A1 - Image display device

Info

Publication number: WO2013027433A1
Application number: PCT/JP2012/057695
Authority: WO
Inventors: 智生小堀; 大内　敏; 瀬尾　欣穂; 横山　淳一
Original assignee: 日立コンシューマエレクトロニクス株式会社
Priority date: 2011-08-22
Filing date: 2012-03-26
Publication date: 2013-02-28
Also published as: JP5685689B2; JP2013044779A

Abstract

The present invention makes a special lens system or optical system configuration for aberration correction, distortion correction, or the like unnecessary when making interpupillary distance adjustments for individuals or making various adjustments for matching convergence distance or visual range in a binocular type head mounted display (HMD). Swinging mirrors (6, 7) make beam light from a light source (10) deviate two-dimensionally by means of reflective mirrors. Eyepiece optical systems (15 - 17) separate the beam light coming from the swinging mirrors, and guide the beam light to the left and right eyes (18), respectively. A mirror drive unit (5) makes the swing angles of the swinging mirrors different for right and left eye image signals according to the difference in light path length arising because of the interpupillary distance (∆d) in the eyepiece optical systems, or an image processing unit (8) makes the length of the display period for the right and left eye image signals different according to the difference in light path length arising because of the interpupillary distance (∆d).

Description

Video display device

The present invention relates to an image display apparatus that displays an image by applying a light beam to a swinging and rotating reflecting mirror and projecting and scanning the obtained reflected light on a display surface, and particularly displays an image suitable for a head-mounted display (HMD). Relates to the device.

The head mounted display (HMD) is excellent in convenience and portability, and various implementation forms have been proposed by improving display device technology and visibility technology. As a main type of HMD, a binocular goggle type using a pair of liquid crystal panels, a headphone type, and a compact and lightweight monocular type eyeglass type using a single liquid crystal panel are known. When using a binocular type HMD, the eye width and the like are different for each person, so it is necessary to add some adjustment function to the HMD side to ensure visibility so as to match the eye width of each person.

For example, Patent Document 1 discloses an optical path splitting unit that splits a light beam from one original image into two light beams in order to provide an optical system that does not cause out-of-focus even when eye width adjustment is performed. A relay lens system for forming a secondary image is provided. The relay lens system includes a first relay system in which the front focal point is located at the position of the original image, and a second relay in which the rear focal point is located at the position of the secondary image. The optical path splitting means is configured to split the optical path between the first relay system and the second relay system.

In Patent Document 2, the left and right images constituting the stereoscopic image are displayed on the display surface in order to make the viewing distance and the convergence distance coincide with each other while maintaining the stereoscopic effect so that natural stereoscopic viewing is possible and no mechanical mechanism is required. And a video shift unit that shifts at least one of the left and right videos displayed on the display unit in the horizontal direction so that the convergence distance is substantially fixed in time.

On the other hand, as a new video display method, a light beam emitted from a light source is scanned two-dimensionally by deflecting means such as a reflecting mirror, and a two-dimensional image is displayed on the screen by the afterimage effect. Type video display devices have been proposed. It is also possible to apply this scanning image display apparatus to the above-described HMD.

JP 7-287188 A JP-A-9-322197

In the binocular HMD using a single display element, the configurations disclosed in Patent Documents 1 and 2 make various adjustments when adjusting the eye width of an individual person or matching the convergence distance and the viewing distance. At this time, the lens system and the optical system configuration such as aberration correction and distortion correction become complicated, leading to an increase in the size and weight of the apparatus, which may impair the original convenience and portability of the HMD.

In addition, when displaying different images on the left and right using a single display element, the image is time-divided using shutter glasses, or the image is time-divided or divided into regions using polarized glasses. The method is common. In the case of an HMD that looks at the outside scene at the same time, the polarization component of the outside scene to be viewed is shielded by the amount of time division or polarization separation, and the brightness may be reduced. Moreover, there is a possibility of promoting a feeling of occlusion of the visual field due to the adjustment mechanism entering the visual field.

An object of the present invention is to provide a special lens system or an optical system such as aberration correction or distortion correction when adjusting the eye width of an individual person in a binocular type HMD, or when making various adjustments so that the convergence distance and the viewing distance coincide with each other. An object of the present invention is to provide a video display device that does not require a configuration.

The present invention relates to a binocular display in which a beam light is emitted two-dimensionally and an image is displayed on a binocular type display screen, respectively, and a light source that emits the beam light and an input video signal are processed. An image processing unit that outputs a left / right eye video signal to be displayed on the screen, a light source driving unit that drives a light source in accordance with the left / right eye video signal, and emits beam light, and 2 A oscillating mirror that deflects dimensionally, a mirror drive unit that oscillates and rotates the oscillating mirror at a predetermined angle in synchronization with the video signal for the left / right eye, and beam light from the oscillating mirror for the left / right eye And an eyepiece optical system that separates the beam into a left beam and a right eye display surface. Here, the eyepiece optical system can adjust the eye width, which is the distance between the display surfaces for the left / right eyes, and the mirror driver can move the left / right eye from the oscillating mirror generated by adjusting the eye width of the eyepiece optical system. The oscillating mirror is driven with different oscillating rotation angles with respect to the video signal for the left / right eye according to the difference in the optical path length to the display surface.

Alternatively, in the video display device, the eyepiece optical system can adjust the eye width which is the interval between the display surfaces for the left / right eyes, and the image processing unit can be a fluctuation generated by adjusting the eye width of the eyepiece optical system. Depending on the difference in the optical path length from the moving mirror to the left / right eye display surface, the length of the display period of the left / right eye video signal is varied and output.

In the video display device of the present invention, when adjusting the eye width of an individual person in a binocular type HMD, or when making various adjustments to make the convergence distance and the viewing distance coincide with each other, a special lens system, aberration correction, distortion correction, etc. An optical system configuration is unnecessary, which leads to a reduction in the size and weight of the apparatus, and can make use of the original convenience and portability of the HMD.

Also, the brightness of the visually recognized outside scene can be maintained in an HMD that displays the same or different images on the left and right using a single display element for stereoscopic viewing and that simultaneously views the outside scene.

It is a block diagram which shows the video display apparatus by a 1st Example (Example 1). 6 is a diagram illustrating timing signals for video display of the left eye and the right eye in Embodiment 1. FIG. It is a block diagram which shows the video display apparatus by a 2nd Example (Example 2). It is a figure which shows the timing signal of the video display of the left eye and right eye in Example 2. FIG. FIG. 3 is a diagram illustrating a left eye and right eye scanning area and an image display area in the first embodiment. It is a figure which shows the scanning area | region and video display area | region of the left eye and right eye in Example 2. FIG. It is a block diagram which shows the video display apparatus by a 3rd Example (Example 3). It is a block diagram which shows the video display apparatus by a 4th Example (Example 4).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a video display apparatus according to a first embodiment of the present invention. This embodiment is a type of HMD that uses a single display element to display the same or different images on the left and right in a time-division manner and stereoscopically view, and to view the outside scene at the same time. The display method is a method in which a light beam emitted from a light source is reflected by a oscillating mirror, projected onto left and right display surfaces, and scanned two-dimensionally to display an image. The video display apparatus will be described separately for an optical system and a control system.

The optical system is composed of red (R), green (G), and blue (B) laser light sources 10r / g / b, a collimating lens 11, a mirror and a dichroic prism, and combines light beams of the respective colors. Unit 12, polarization conversion unit 14 that repeats transmission and polarization conversion in a time-sharing manner, two-axis oscillating

mirrors

6 and 7 that deflect beam light two-dimensionally, a polarizing beam splitter 15 and a mirror 16 as an eyepiece optical system, It has an eye part 17L / R and is configured to project an image from the right eye side on the left / right eye 18L / R of the user as a display surface. Each laser light source 10 emits the light beam of the same polarization state (P-polarized light in this embodiment) modulated by the video signal, and becomes the light beam 13 aligned on the same axis in the optical multiplexing unit 12. The light beam is switched alternately between the P-polarized light and the S-polarized light in a time division manner by the polarization converter 14, and the biaxial oscillating

mirrors

6 and 7 oscillate and rotate the reflecting mirrors horizontally and vertically at a predetermined angle. Thus, the beam light is deflected two-dimensionally. In the polarizing beam splitter 15, when the deflected beam light is S-polarized light, it is reflected and proceeds to the eyepiece 17R for the right eye, and when it is P-polarized light, it is transmitted and passed through the mirror 16 to the eyepiece 17L for the left eye. To the user's right eye 18R and left eye 18L, which are display surfaces, respectively, and displays an image.

The configuration of the control system includes a timing generation unit 3 that generates a timing signal, a mirror control unit 4 that sets a swing condition of the

swing mirrors

6 and 7, a mirror drive unit 5 that drives the

swing mirrors

6 and 7, and an input video. It has an image processing unit 8 that processes a signal to generate a display video signal, and a light source driving unit 9 that drives a laser light source 10. The input video signal 2 is separated into a left-eye video signal and a right-eye video signal by the image processing unit 8, and the light source driving unit 9 drives the laser light source 10 in accordance with each video signal (R, G, B). Supply signal. The timing generation unit 3 determines the display timing of the video signal for the left eye and the right eye in accordance with the swing timing of the

swing mirrors

6 and 7, and switches the P polarization / S polarization of the polarization conversion unit 14. Control. The eye width signal 1 indicating the interval (eye width Δd) between the left / right eyes 18L / R of the user is input to the timing generation unit 3 and sent to the mirror control unit 4. The mirror control unit 4 sets the swing angle of the

swing mirrors

6 and 7 for left eye display and right eye display according to the eye width Δd, and the mirror drive unit 5 swings the swing angle with respect to the

swing mirrors

6 and 7. The drive signal according to the is supplied.

Hereinafter, the configuration of each unit will be described. As the light source of this embodiment, a laser light source 10 that can easily modulate the light quantity of the beam light at high speed is used. Of course, instead of the laser light source, an LED light source may be used together with an optical component for beam condensing and a light amount modulating component. The spot diameter of the light beam (beam diameter) is defined as a spot diameter where the radiant intensity is 1 / e ² (13.5%) of the peak value or the value on the optical axis. The video to be displayed satisfies the desired resolution. The wavelengths of the

laser light sources

10r, 10g, and 10b are visible light having λr = 640 nm, λg = 530 nm, and λb = 450 nm.

In the polarization conversion unit 14, transmission is performed in a time division manner (P-polarized output) in accordance with the display period of the left eye / right eye based on the switching signal (LR_SW) between the left eye video and the right eye video from the timing generation unit 3. And polarization conversion (S-polarized light output) are repeated.

The biaxial oscillating mirrors 6 and 7 oscillate the reflecting mirror two-dimensionally, and the drive system may be any of electromagnetic induction, piezoelectric drive, electrostatic drive, and the like. As a specific example of the oscillating mirrors 6 and 7, the oscillating mirror 6 for horizontally scanning the display screen (H_scan) has a size of φL = 1.5 mm and an oscillation period of 25 kHz. On the other hand, the oscillating mirror 7 that vertically scans the display screen (V_scan) oscillates at a period of 60 Hz. The mirror driving unit 5 supplies a 25 kHz horizontal drive signal (H_drive) and a 60 Hz vertical drive signal (V_drive) to the oscillating mirrors 6 and 7. Further, the horizontal / vertical swing angle (rotation angle) of the swing mirrors 6 and 7 is adjusted by changing the horizontal / vertical drive signal amplitude. In the vertical drive, the screen is scanned in one direction (for example, from the top to the bottom), but in the horizontal drive, the screen is scanned back and forth in two directions (left to right and right to left).

Eye width adjustment is performed at the eyepiece 17L / R. If the fixed optical path length from the oscillating mirror 6 to the right eye 18R is d and the eye width of the user is Δd, the optical path length from the oscillating mirror 6 to the left eye 18L is d + Δd. In the eye width adjustment, after the position of the eyepiece 17R is adjusted to the right eye 18R of the user, the position of the eyepiece 17L is moved to match the left eye 18L of the user by using an adjustment mechanism (not shown). This adjustment may be performed not only when the HMD is mounted but also during video display.

When the mirror control unit 4 and the mirror driving unit 5 acquire information on the fixed optical path length d and the adjusted eye width Δd from the eyepiece unit 17L / R, the left eye and the right eye each have a desired scanning range. Then, the swinging conditions of the swinging mirrors 6 and 7 are set and driven. The image processing unit 8 sets and processes image processing conditions so that each of the left eye and the right eye has a desired video display size.

As described above, in this embodiment, the swing angle of the swing mirrors 6 and 7 is set according to the difference in the optical path length from the swing mirrors 6 and 7 caused by the user's eye width Δd, and the left eye image display and It is characterized in that the rocking angles of the rocking mirrors 6 and 7 are switched when displaying the right eye image.

FIG. 2 is a diagram showing timing signals for video display of the left eye and the right eye. The upper side of the drawing shows the timing signal in the vertical direction of the screen, and the lower side shows the timing signal in the horizontal direction of the screen.

The timing generation unit 3 generates vertical / horizontal start reference signals (V_start, H_start) from the swing position signals (V_position, H_position) of the swing mirrors 6 and 7 detected by the mirror drive unit 5, and based on this, the video A signal frame start signal (V_sync) and a line start signal (H_sync) are generated. Further, the timing generation unit 3 is a switching signal for switching the mirror drive signals (V_drive, H_drive) between the left eye and the right eye in order to realize time division display of the left eye (L-ch) and the right eye (R-ch). A switching signal (LR_SW) for switching the video display period (V_disp, H_disp) between the left eye and the right eye (LR_SW_M) is generated.

In the adjustment of the swing angle, the horizontal / vertical scan amount (raster scan amount) at the left and right eyepieces 17L / R with respect to the optical path length d from the swing mirror 6 to the right eye and the optical path length d + Δd from the left eye. The left / right eye swing angle θL / R of the

mirrors

6 and 7 is determined so that RSh / RSv match. For example, when the optical path length to the right eye is d = 50 mm and the eye width is Δd = 80 mm, the left-eye swing angle θL = atan (RSh / RSh / 2 / (d + Δd)) = ± 2.2 ° and the right-eye swing angle θR = atan (RSh / 2 / d) = ± 5.7 °. The vertical oscillating mirror 7 is similarly determined according to the vertical raster scan amount RSv.

The mirror drive unit 5 gives drive signals (H_drive, V_drive) to the oscillating mirrors 6 and 7 so as to oscillate at the oscillation angle θL / R. Assuming that the swing angle is proportional to the drive voltage, as shown in FIG. 2, the drive signal amplitude for the right eye drive period is 5.7 (relative value), and the drive signal amplitude for the left eye drive period is By setting the value to 2.2 (relative value), the horizontal / vertical raster scan amounts RSh / RSv with the left / right eye can be matched.

Further, the timing generation unit 3 adjusts the video display area (period) signal (period) so that the resolution matches the video display area in the left and right eyepieces 17L / R in accordance with the rocking conditions of the rocking mirrors 6 and 7. V_disp, H_disp) and left / right eye pixel clocks (clk_l, clk_r) are generated. The image processing unit 8 performs frame rate conversion, scaling, and resolution so that the input video signal Video for left / right eye is synchronized with the video display area signal (V_disp, H_disp) and the pixel clock (clk_l, clk_r). Conversion and the like are performed and output to the light source drive unit 9.

The video display area signal (V_disp) in the vertical direction has a right eye display start time t1, a right eye display area time t2, a left eye display start time t3, and a left eye display area time t4 based on the vertical synchronization signal (V_sync). It is a signal to determine. The horizontal video display area signal (H_disp) is scanned in the forward direction (from left to right) with the horizontal synchronization signal (H_sync) as a reference within the period of the right eye display area time t2 and the left eye display area time t4. It is determined separately in the right direction) and the reverse direction (from right to left). For the right eye, a forward display start time t21, a forward display area time t22, a backward display start time t23, and a backward display area time t24 are defined, and for the left eye, a forward display start time t41 and a forward display. An area time t42, a reverse display start time t43, and a reverse display area time t44 are determined.

In the configuration of this embodiment, as described above, since the scanning area (raster scanning amount) is matched with the left / right eye, the video display area signals (V_disp, H_disp) and the pixel clocks (clk_l, clk_r) are left Same condition for eyes and right eye.

FIG. 5 is a diagram showing a scanning area and an image display area for the left eye and the right eye. As described above, the scanning area 20L / R and the video display area 21L / R in the eyepiece 17L / R are driven under the same conditions for both the left and right eyes. However, in order to view stereoscopic images without a sense of incongruity due to individual differences among users and the usage status of the HMD, it is necessary to match the convergence distance and viewing distance between the left and right eyes. Do. In the display position shift adjustment, the vertical display start times t1 and t3 and the horizontal display start times t21, t23, t41, and t43 are adjusted in the video display area signals (V_disp, H_disp) in FIG. As a result, the video display area 21L / R in the scanning area 20L / R shown in FIG. 5 is shifted up, down, left, and right, and the user can view the stereoscopic video without a sense of incongruity.

As described above, in the present embodiment, in a binocular type HMD using a single display element, when adjusting the eye width of each person, or when making various adjustments so that the convergence distance and the viewing distance coincide with each other, Therefore, a special lens system and an optical system configuration such as aberration correction and distortion correction are not necessary. Accordingly, the size and weight of the apparatus can be reduced, and this can be realized without impairing the original convenience and portability of the HMD.

In addition, the brightness of the outside scene to be viewed can be maintained in a type of HMD that uses the single display element to display the same or different images on the left and right for stereoscopic viewing and simultaneously view the outside scene. In addition, it is possible to reduce the deterioration in visibility such as the color breakage characteristic of the video image and the crosstalk (mixing) of the left and right video images, which is a device that uses the same element in time division.

Furthermore, even when a flashing body is present in the outside scene in the field of view, there is no period for blocking external light, and therefore flicker (flashing) due to the relationship between the flashing cycle of the flashing body and the operation cycle of the display element does not occur. In addition, since the configuration does not include polarized glasses or polarized shutter glasses, the polarization component of the external light can be stored and visually recognized, so that the brightness of the outside scene can be suppressed.

In the present embodiment, the following modifications and replacements are possible. In this embodiment, the P / S polarization is switched for switching between the left eye and the right eye, but right / left circular polarization may be used. When the light source is a non-polarized light source such as an LED element or phosphor excitation light, it may be aligned with any of the P / S polarized light components, or the polarization converter 14 may change the P polarized light or S polarized light components. You may select by division | segmentation.

The oscillating mirrors 6 and 7 are configured to mechanically oscillate the mirror surface, but may be configured by an electric deflection element that electrically controls the amount of diffraction and refraction of light. The optical path from the oscillating mirror 6 to the eyepiece 17L / R is not limited to the configuration shown in FIG. 1, and may be configured to be incident from the left eye side if the left / right eye has different polarization components. good.

Although the raster scan amount has been described in the optical system on the premise of direct drawing, a configuration in which the raster scan amount is adjusted by arranging an enlargement / reduction optical system corresponding to the beam diameter, for example, in the eyepiece portion 17L / R. A detector for detecting the left eye / right eye gazing point may be added to the eyepiece 17L / R, and the video display area may be shifted based on the gazing point information.

FIG. 3 is a block diagram showing a video display apparatus according to the second embodiment of the present invention. In the present embodiment, in the configuration of the first embodiment (FIG. 1), the swing condition (H_drive) of the horizontal swing mirror 6 is the same in the drive period for the left / right eye, and the image processing unit 8 The length of the display period in the horizontal direction of the output video signal for the left / right eye is different. Hereinafter, the change of the display period is referred to as “scaling process”. This method is used when it is difficult to switch the oscillating angle (amplitude) of the oscillating mirror 6 to a high speed (for example, 25 kHz) in the left / right eye driving period due to the influence of the resonance frequency characteristics of the oscillating mirror 6. It becomes effective.

In this embodiment, since the horizontal left / right eye swing angles are the same (θL = θR), the left / right eye horizontal raster scan amount RSh is proportional to the respective optical path lengths and corresponds to the eye width Δd. There will be a difference as much as you do. Under the numerical conditions in the first embodiment, the horizontal raster scan amount RSh for the left eye is increased to 130/50 = 2.6 times that of the right eye, so the video display period for the left eye is increased to 1 / 2.6 times. Reduce (scaling process) to match the display size of the left / right eye. On the other hand, since the raster scan amount RSv in the vertical direction is the same for the left / right eye, the scaling process is not performed.

FIG. 4 is a diagram showing timing signals for video display of the left eye and the right eye. The upper side of the drawing shows a timing signal in the vertical direction of the screen, and the lower side shows a timing signal in the horizontal direction of the screen. The vertical drive signal (V_drive) for the oscillating mirror 7 gives different amplitudes for the left and right eyes as in the first embodiment (FIG. 2), but the horizontal drive signal (H_drive) is the same for the left and right eyes. Give the amplitude.

Regarding the video display area signal (V_disp) in the vertical direction, the left eye and the right eye may have the same conditions. For the horizontal video display area signal (H_disp), scaling processing is performed so that the left and right eyes have the same video display area, and the left eye display area time is reduced to t42 ′ and t44 ′. The eye display start time is changed to t41 ′ and t43 ′. In addition, the frequency (modulation speed) of the pixel clock (clk_l) is increased in order to maintain the resolution of the display image of the left eye by reducing the display area time. Further, the laser light source 10r / g / b is adjusted and driven so that a desired luminance can be obtained according to the light emission time per pixel.

FIG. 6 is a diagram showing a left eye and right eye scanning area and a video display area. Although the scanning area 20L / R is different on the left and right, the video display area 21L / R can be the same on the left and right. Furthermore, the display area shift adjustment for matching the convergence distance and the viewing distance between the left and right eyes is the same as in the first embodiment, in the vertical display start times t1 and t3 in FIG. 4 and the horizontal display start time t21. , T23, t41 ′, t43 ′.

In this embodiment, even when the high frequency characteristics of the oscillating mirror are limited, the left and right display areas can be electrically processed so as to be the same. In addition, when adjusting the eye width of each person, or when making various adjustments so that the convergence distance and the viewing distance coincide with each other, it is configured to electrically adjust based on the timing signal, so a special lens system, aberration correction, An optical system configuration such as distortion correction becomes unnecessary.

In the above embodiment, the swing condition (H_drive) of the horizontal swing mirror 6 is the same for the left / right eye, but the swing condition (V_drive) of the vertical swing mirror 7 is set to the left / right. It can be the same for the right eye. In that case, the scaling process may be applied to the vertical display period of the video signal for the left / right eye.

FIG. 7 is a block diagram showing a video display device according to a third embodiment of the present invention. In this embodiment, the configuration of the first embodiment (FIG. 1) is such that the polarization conversion unit 14 is eliminated and two light sources having different polarization directions for each wavelength are used as the laser light source 10r / g / b. is there. Here, two elements having a polarization state of P-polarized light and S-polarized light are arranged, and a total of six light beams are emitted. The optical combiner 12 combines them, aligns them on the same axis, and combines them into one beam light 13 '.

In this embodiment, the light source driver 9 ′ drives / stops each of the two elements (for P-polarized light and S-polarized light) of the laser light source 10r / g / b at the timing of the switching signal (LR_SW) shown in the first embodiment. Switch. As described in the first embodiment, the left and right video display areas in the eyepiece 17L / R are switched as shown in FIG. 5 by switching the swing angle of the swing mirrors 6 and 7 between the left eye and the right eye. 21L / R is the same.

Alternatively, as another method, the light source driver 9 ′ emits P-polarized light and S-polarized light from the laser light source 10r / g / b at the same time, and the left eye image and the right eye image are displayed on the eyepiece 17L / R. It can also be displayed at the same time. In this case, the synthesized light beam 13 'is superimposed with the left-eye P-polarized light and the right-eye S-polarized light, so that the oscillating mirrors 6 and 7 are driven under a single oscillating condition. At that time, the image processing (scaling processing in the horizontal direction and the vertical direction) described in the second embodiment is performed on the video signal for the left eye (P-polarized light), so that the eyepiece 17L / R as shown in FIG. The left and right video display areas 21L / R can be made the same.

FIG. 8 is a block diagram showing a video display device according to a fourth embodiment of the present invention. In this embodiment, in the configuration of the first embodiment (FIG. 1), a movable focus lens mechanism 19 used in a pickup device such as a CD / DVD is replaced by a polarization converter 14 and swing mirrors 6 and 7. It is arranged on the beam optical path between. Then, the focus position is switched by the above-described switching signal (LR_SW) between the left eye image and the right eye image, and control is performed so that the left and right images have the same beam diameter in the eyepiece 17L / R. By adjusting the beam diameter, it is possible to obtain a desired resolution regardless of the optical path lengths of the left and right images. The focus position may be on the retina of the eyeball.

The present invention is not limited to the above-described embodiments, and a part of the configuration of one embodiment may be replaced with the configuration of another embodiment, or the configuration of another embodiment may be added to the configuration of one embodiment. It is also possible to do.

In each of the above-described embodiments, the video display device suitable for the HMD has been described. However, the present invention is not limited to direct drawing on the eyeball, and displays at least two videos (same angle of view or different angles of view) with different projection areas. The present invention can also be applied to a projection display device that is configured to achieve the same effect.

1: eye width signal (Δd), 2: video signal, 3: timing generation unit, 4: mirror control unit, 5: mirror drive unit, 6, 7: biaxial oscillating mirror, 8: image processing unit, 9, 9 ': light source drive unit, 10r / g / b: light source, 11: collimating lens, 12: optical multiplexing unit, 13, 13': beam light, 14: polarization conversion unit, 15: polarization beam splitter, 16: mirror, 17L / R: eyepiece, 18L / R: left / right eye, 19: focus lens mechanism, 20L / R: scanning area, 21L / R: video display area, V_drive, H_drive: mirror drive signal, V_disp, H_disp: Video display area signal.

Claims

In an image display device that deflects beam light two-dimensionally and displays an image on a binocular display screen,
A light source that emits beam light;
An image processing unit that processes an input video signal and outputs a left / right-eye video signal to be displayed on the binocular type display surface;
A light source driving unit for driving the light source in accordance with the left / right eye video signal and emitting beam light;
An oscillating mirror for deflecting the beam light two-dimensionally by a reflecting mirror;
A mirror driving unit that swings and rotates the oscillating mirror at a predetermined angle in synchronization with the video signal for the left / right eye;
An eyepiece optical system that separates the beam light from the oscillating mirror into a left / right eye beam and guides it to the display surface for the left / right eye, respectively.
The eyepiece optical system is capable of adjusting an eye width that is an interval between the display surfaces for the left / right eyes,
The mirror driving unit applies the left / right-eye video signal to the left / right-eye video signal according to a difference in optical path length from the oscillating mirror to the left / right-eye display surface caused by adjusting the eye width of the eyepiece optical system. An image display device, wherein the oscillating mirror is driven with different oscillating rotation angles.
In an image display device that deflects beam light two-dimensionally and displays an image on a binocular display screen,
A light source that emits beam light;
An image processing unit that processes an input video signal and generates a left / right eye video signal to be displayed on the binocular type display surface;
A light source driving unit for driving the light source in accordance with the left / right eye video signal and emitting beam light;
An oscillating mirror for deflecting the beam light two-dimensionally by a reflecting mirror;
A mirror driving unit that swings and rotates the oscillating mirror at a predetermined angle in synchronization with the video signal for the left / right eye;
An eyepiece optical system that separates the beam light from the oscillating mirror into a left / right eye beam and guides it to the display surface for the left / right eye, respectively.
The eyepiece optical system is capable of adjusting an eye width that is an interval between the display surfaces for the left / right eyes,
The image processing unit is configured to output the video signal for the left / right eye according to a difference in optical path length from the oscillating mirror to the display surface for the left / right eye generated by adjusting an eye width of the eyepiece optical system. An image display device characterized in that a display period is output in different lengths.
In an image display device that deflects beam light two-dimensionally and displays an image on a binocular display screen,
A light source that emits beam light;
An image processing unit that processes an input video signal and generates a left / right eye video signal to be displayed on the binocular type display surface;
A light source driving unit for driving the light source in accordance with the left / right eye video signal and emitting beam light;
An oscillating mirror for deflecting the beam light two-dimensionally by a reflecting mirror;
A mirror driving unit that swings and rotates the oscillating mirror at a predetermined angle in synchronization with the video signal for the left / right eye;
An eyepiece optical system that separates the beam light from the oscillating mirror into a left / right eye beam and guides it to the display surface for the left / right eye, respectively.
The eyepiece optical system is capable of adjusting an eye width that is an interval between the display surfaces for the left / right eyes,
The mirror driving unit applies the left / right-eye video signal to the left / right-eye video signal according to a difference in optical path length from the oscillating mirror to the left / right-eye display surface caused by adjusting the eye width of the eyepiece optical system. While driving the swing mirror with different swing rotation angles in the screen vertical direction,
The image processing unit is configured to output the left / right eye video signal according to a difference in optical path length from the oscillating mirror to the left / right eye display surface generated by adjusting an eye width of the eyepiece optical system. An image display device characterized in that a display period in the horizontal direction of the screen is output with different lengths.
In the video display device according to any one of claims 1 to 3,
The image processing unit shifts and outputs the display position of the video signal for the left / right eye in order to match the convergence distance or the viewing distance of the left / right eye in the eyepiece optical system. Display device.
In the video display device according to any one of claims 1 to 4,
The light source emits a light beam in a first polarization state;
Before the oscillating mirror, a polarization conversion unit that converts the polarization state of the beam light from the first polarization state to a second polarization state different from the first polarization state,
A polarization beam splitter that separates the beam light in the first polarization state and the beam light in the second polarization state after the oscillating mirror;
The polarization conversion unit performs polarization conversion on the beam light emitted from the light source in synchronization with the switching of the video signal for the left / right eye, and converts the beam light in the first polarization state and the second polarization state. Alternately output
The eyepiece optical system guides the beam light in the first polarization state and the beam light in the second polarization state separated by the polarization beam splitter to the display surface for the left / right eye. Video display device.
In the video display device according to any one of claims 1 to 4,
The light source can emit beam light in a first polarization state and beam light in a second polarization state different from the first polarization state,
The light source driving unit alternately outputs the light beams of the first polarization state and the second polarization state from the light source in synchronization with the switching of the video signal for the left / right eye,
A polarization beam splitter that separates the beam light in the first polarization state and the beam light in the second polarization state after the oscillating mirror;
The eyepiece optical system guides the beam light in the first polarization state and the beam light in the second polarization state separated by the polarization beam splitter to the display surface for the left / right eye. Video display device.
The video display device according to claim 2,
The light source is capable of simultaneously emitting beam light in a first polarization state and beam light in a second polarization state different from the first polarization state,
The light source driving unit simultaneously outputs the light beam in the first polarization state corresponding to the video signal for the left eye and the light beam in the second polarization state corresponding to the video signal for the right eye from the light source. Output
A polarization beam splitter that separates the beam light in the first polarization state and the beam light in the second polarization state after the oscillating mirror;
The eyepiece optical system guides the beam light in the first polarization state and the beam light in the second polarization state separated by the polarization beam splitter simultaneously to the display surface for the left / right eye. Video display device.
The video display device according to any one of claims 1 to 6,
A movable focus lens mechanism in front of the oscillating mirror;
A video display device, wherein the focus position of the focus lens mechanism is switched in synchronization with the switching of the video signal for the left / right eye.