WO2006057227A1 - 映像表示装置 - Google Patents
映像表示装置 Download PDFInfo
- Publication number
- WO2006057227A1 WO2006057227A1 PCT/JP2005/021408 JP2005021408W WO2006057227A1 WO 2006057227 A1 WO2006057227 A1 WO 2006057227A1 JP 2005021408 W JP2005021408 W JP 2005021408W WO 2006057227 A1 WO2006057227 A1 WO 2006057227A1
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- WIPO (PCT)
- Prior art keywords
- distance
- user
- display device
- imaging distance
- image
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7475—Constructional details of television projection apparatus
- H04N5/7491—Constructional details of television projection apparatus of head mounted projectors
Definitions
- the present invention relates to a video display device, and more specifically, a head mounted display (HMD), a head-up display (HMD) for projecting and displaying an optical image onto a viewer's eye using a hologram element.
- the present invention relates to a video display device such as HUD (Head Up Display).
- a head-mounted image display device such as an HMD or HUD includes an image projection means for projecting an optical image and an eyepiece optical means for guiding the optical image to a user's eye.
- the projected optical image is guided to the user's eye through the eyepiece optical means, so that the user can observe the virtual image of the optical image.
- the position of the virtual image displayed by such a video display device is set to be displayed at a predetermined position from the user's eyes. Therefore, the user needs to focus on the position where the virtual image is displayed when trying to observe the virtual image, and when the video display device is used for a long time, the headache may occur due to an increase in the load on the eyes. There was a medicinal problem, such as to do, and it was not always good to use and use!
- an image display device capable of adjusting the position of a virtual image
- an image display means for displaying an image an optical means for optically generating a virtual image of an image displayed on the image display means, and a virtual image
- An image display comprising adjusting means for adjusting the position, position display means for displaying the position of the virtual image, and control means for automatically controlling the position of the power source or the virtual image in accordance with the position of the virtual image and its display time
- Patent Document 1 Japanese Patent No. 3322283
- the user himself / herself rotates the virtual image position adjusting knob to adjust the position of the virtual image to be displayed. If the distance to the object in the outside world and the position of the virtual image are different, there is a problem that it is difficult to view the object in the outside world and the virtual image at the same time.
- the left and right eyes of a human cannot focus on a plurality of objects at different distances at the same time, it is difficult to visually recognize the objects with individual focal points at the same time. For this reason, it is impossible to visually recognize either a virtual image or a target object at a predetermined position (imaging distance). Accordingly, a virtual image (for example, a road guide image such as a map) cannot be visually recognized while visually recognizing an object (for example, a car or the like) while walking, which is not easy to use. Disclosure of the invention
- the present invention provides a video display device provided with video projection means for projecting an optical image and eyepiece optical means for guiding the optical image projected from the video projection means to the eye, when the video display device is mounted.
- An imaging distance detection means for obtaining an estimated value obtained by calculation based on an actual measurement value of an object distance, which is a distance to an external object recognized by a user, an intrinsic visual condition, or an extrinsic external condition;
- a target imaging distance setting means for setting a target imaging distance corresponding to the object distance detected by the imaging distance detection means, and a target imaging distance set by the target imaging distance setting means.
- an imaging distance control means for controlling the imaging distance of the optical image projected onto the eyepiece optical means.
- FIG. 1 is an external view of a video display device 1 in the present embodiment.
- FIG. 2 is a cross-sectional view of a prism 20R including a display unit 10.
- FIG. 3 is an external view of another example of the video display device 1 in the present embodiment.
- FIG. 4 is a control block diagram of video display device 1 in the present embodiment.
- FIG. 5 is an example of a projection view inside a vehicle on which a user wearing the video display device 1 of the present embodiment is riding.
- FIG. 6 is a conversion graph of the position of the display panel 13 with respect to the target imaging distance.
- FIG. 7 is a conversion graph of viewing angle with respect to speed.
- FIG. 8 is an operation flow for setting a target imaging distance in the present embodiment.
- FIG. 9 is an operational flow of a process for calculating an object distance based on gaze detection that is a visual condition.
- FIG. 10 An operation flow of the object distance calculation processing by the cornea and the lens measurement which is a visual condition.
- Fig. 11 This is an operation flow of the object distance calculation process based on retinal image measurement, which is the visual condition.
- FIG. 12 This is an operational flow of a calculation process of an object distance according to a relative speed change amount and a moving direction between a user and an external object, which are external conditions.
- FIG. 1 shows an external view of a video display device 1 according to the present embodiment.
- the video display device 1 includes a display unit 10, an image processing unit 40, and a data input unit 5.
- control unit 60 pair of left and right prisms 20R, 20L, nose pad unit 31, pair of left and right temples 3
- the display unit 10 is attached to a prism 20R positioned in front of the user's right eye.
- FIG. 2 shows a cross-sectional view of the prism 20R including the display unit 10. As shown in FIG.
- the display unit 10 is a video projection unit that projects an optical image, and includes a light source 11, a condenser lens 12, a display panel 13, a housing 14, and the like.
- the light source 11 includes a light emitting diode (LED) and emits irradiation light to the display panel 13.
- the condenser lens 12 condenses the light from the light source 11 and uniformly guides it to the entire display panel 13.
- the display panel 13 also has a transmissive liquid crystal display (LCD) force, displays an image for display to the user, and is inclined with respect to the surface 21a of the first prism 21. Yes.
- the housing 14 covers and holds the light source 11, the condenser lens 12, and the display panel 13.
- the display panel 13 is supported by a drive mechanism (not shown) that is movable in the direction of the optical axis from the light source 11, and the LCD drive of the control unit 60 is performed. Driven based on the instruction signal, the relative distance to the condenser lens 12 is changed.
- a drive mechanism for moving the display panel 13 in the optical axis direction a mechanism that can be miniaturized and driven with high precision is preferred. For example, a zoom impact drive mechanism (SIDM) can be used.
- SIDM zoom impact drive mechanism
- the prism 20L has a flat plate shape and is formed of a single member, whereas the prism 20R has a flat plate-like force like the prism 20L.
- the first prism 21 does not have a single member.
- the eyepiece optical means is composed of a second prism 22 and a hologram element 23 and guides an optical image projected from the display unit 10 to the eyes of the user.
- the first prism 21 and the second prism 22 constituting the prism 20R have complementary shapes, and are joined so that there is no gap and the surface is continuous.
- the prism 20L, the first prism 21, and the second prism 22 are made of the same material, and there is no difference in refractive index between these three.
- the prisms 20R and 20L have a target shape like a general spectacle lens, except that the first prism 21 has an end portion that is not joined to the second prism 22.
- the first prism 21 is made of transparent glass or resin.
- the portion of the first prism 21 on the side irradiated with light from the display panel 13 has a wedge shape whose edge is thicker than the inner side, and the casing 14 sandwiches the upper end of the wedge shape. In this manner, the first prism 21 is attached.
- the part shape of the first prism 21 joined to the second prism 22 is made so that the front surface (the surface where the eye E force is further away) approaches the rear surface (the surface close to the eye E) as the directional force is in the center of the prism 20R. It is wedge-shaped.
- the front surface of this wedge-shaped part (the joint surface with the second prism 22) is a plane, and on this plane, the hologram element 23 is formed so as to be positioned immediately in front of the user's eye E when the image display device 1 is mounted. ing.
- the first prism 21 guides the image light from the display panel 13 to the user's eye E and displays a virtual image of the image displayed on the display panel 13.
- the first prism 21 guides the image light from the display panel 13 to the inside of the first prism 21 from the surface 21a, and guides it to the hologram element 23 while being totally reflected on the front surface and the rear surface a plurality of times.
- the hologram element 23 diffracts the guided light into a light beam close to parallel light and makes it incident on the eye E. As a result, a virtual image of the image displayed on the display panel 23 is displayed on the user's eye E.
- the hologram element 23 hardly acts on light from the outside world, and the virtual image is the center of the outside world image. It is an optical element that is observed while overlapping the part.
- the user can see the outside through the first and second prisms 21 and 22 and the hologram element 23 when image observation is not performed.
- first prism 21, the second prism 22, and the hologram element 23 constitute an eyepiece optical means having translucency.
- Such an eyepiece optical means has a good see-through property, so the field of view is not disturbed. Even in the virtual image display part provided with the hologram element 23, the outside world can be seen beyond it. It is suitable for displaying car status, traffic information, etc. for actions that require judgment.
- the line of sight is diverted to see a screen on which information such as the current position and direction of travel of the traveling car is displayed.
- this eyepiece optical means reduces the possibility of being inadvertent forward.
- the image processing unit 40 and the control unit 60 are replaced with the display unit 10 and the data input unit.
- the force shown as a configuration provided with 50 The image processing unit 40 and the control unit 60 may be provided separately.
- the video display device 1 of the present embodiment is configured to display an image on the right eye, but may be configured to display an image on the left eye. As shown, it is configured to display video on both eyes.
- FIG. 3 shows an external view of another example of video display device 1 according to the present embodiment.
- the video display device 1 shown in FIG. 3 includes a pair of display units 10, an image processing unit 40, and a data input unit 5
- a control unit 60, and prisms 20R and 20L are provided to display an image on both the left and right eyes, and the configuration of each of the left and right units is the same as that of the image display device 1 shown in FIG.
- FIG. 4 shows a control block diagram of video display device 1 in the present embodiment.
- the video table device 1 is configured as shown in FIGS. 1 to 3, and includes a display unit 10, an image processing unit 40, a data input unit 50, a microphone 71, an earphone 72,
- the communication unit 73 is connected to the control unit 60 so that they can communicate with each other.
- the display unit 10 displays the processed image information !, emits image light as an optical image to the prism 20R, guides it to the user's eye E, and displays a virtual image of the image to the user
- the display unit 10 functions as an LCD drive unit 13a as a drive mechanism that moves the display panel 13 in the optical axis direction based on an LCD drive instruction signal from the control unit 60. Is provided.
- the image processing unit 40 includes a CPU (Central Processing Unit) that controls the entire image processing, a ROM (Read Only Memory) that stores a processing program, a RAM (Random Access Memory) that temporarily stores data, and the like.
- Image processing such as gradation conversion, color conversion, sharpness processing, and image extraction! ⁇ Image processing is performed so that image information can be displayed as video.
- the data input unit 50 includes a selection switch 51, a line-of-sight detection unit 52a, a distance measurement unit 52b, a cornea measurement unit 53a, a crystalline lens measurement unit 53b, a retinal image detection unit 54, a positioning unit 55, a seat position detection unit 56, It has an inter-vehicle distance detection unit 57, an engine drive detection unit 58, a power switch, a mounting detection sensor (not shown), and the like.
- the data input unit 50 uses any one of the line-of-sight detection unit 52a and the distance measurement unit 52b, the cornea measurement unit 53a and the lens measurement unit 53b, the retinal image detection unit 54, and the positioning unit 55, and the video display device 1
- the selection switch 51 selects whether or not to dynamically adjust the imaging distance of the virtual image displayed on the distance to the external object (hereinafter referred to as an object) focused by the user. It is a means. When the selection switch 51 is in the ON state, the imaging distance of the virtual image is dynamically set. When the selection switch 51 is in the OFF state, the virtual image is displayed at the preset imaging distance.
- the line-of-sight detection unit 52a is line-of-sight detection means for detecting the eye movement of the user and detecting the direction of the line of sight.
- an infrared light emitting unit, an infrared light receiving unit, an optical system, a calculation unit, etc. are provided.
- the infrared light emitting unit emits infrared light to the user's eyeball, and the reflected light is received by the infrared light receiving unit. Based on the reflected image obtained from the light receiving unit, the center of the pupil can be extracted to detect the user's line of sight.
- the distance measuring unit 52b is a distance measuring unit that measures the distance to an object existing in the line-of-sight direction detected by the line-of-sight detection unit 52a.
- the distance to the object can be measured using the optical triangulation principle in the optical measurement method.
- a light projecting unit, a light receiving unit, an optical system, a calculation unit, etc. are provided, and the ray is detected in the line-of-sight direction detected from the light projecting unit.
- the light is reflected by the light receiving unit, and the distance to the object can be measured based on the principle of triangulation.
- the distance measuring unit 52 is not limited to this as long as it can measure the distance to the target existing in the line-of-sight direction, and may use an ultrasonic measurement means.
- the cornea measurement unit 53a is a cornea measurement unit that measures the curvature state (corneal curvature radius, curvature, etc.) of the user and detects the refractive power D1 of the cornea.
- it has a light emitting unit, a light receiving unit, an optical system, a calculation unit, etc., and a light emitting unit force is applied to the user's cornea, and the light receiving unit receives the reflected light from the cornea.
- the refractive power D1 of the cornea can be detected by a cornea meter that detects the curved state of the cornea based on the reflected image.
- the crystalline lens measuring unit 53b is a crystalline lens measuring unit that measures the refractive index of the crystalline lens of the user and detects the refractive power D2 of the crystalline lens. For example, it has a light emitting part, a light receiving part, an optical system, a calculation part, etc., and a light emitting part force projects light toward the user's eyeball, and the projected light receives reflected light from the front and back surfaces of the crystalline lens. Can detect the refractive power D2 of the crystal based on the reflected image obtained from the light receiving portion.
- the retinal image detection unit 54 is a retinal image detection unit that detects a retinal image of the user and detects the refractive power D3 of the entire eye of the user.
- it has a light projecting unit, a light receiving unit, an optical system, a calculation unit, etc., projecting index light from the light projecting unit to the fundus of the user, and receiving the reflected image (retinal image) reflected from the fundus
- the refractive power D3 of the entire eye of the user can be detected based on the reflected image (retinal image) obtained from the light receiving unit.
- the positioning unit 55 measures the current position of the user based on the longitude / latitude! /, And direction detection means for detecting the moving direction of the user relative to the external object and the user and the external object. It has a function of a speed detecting means for detecting the relative moving speed of.
- GPS receiver that detects the reception time of GPS signals transmitted from multiple GPS (G1 obal Positioning System) satellites 101, three nearby mobile phones, and mobile wireless phones such as PHS (Personal Handyphone System)
- GPS receiver that detects the reception time of GPS signals transmitted from multiple GPS (G1 obal Positioning System) satellites 101, three nearby mobile phones, and mobile wireless phones such as PHS (Personal Handyphone System)
- a communication terminal that can communicate with the wireless base station 102 can be used, and the current position of the user is measured based on a known three-point surveying method. To detect.
- the seat position detection unit 56 determines which seat of the automobile 200 the user is sitting on. It is for. For example, it detects radio waves generated by radio remote control keys (electronic keys) 201 that can be remotely operated to unlock the doors of automobiles, Z locks, engine start, etc., and infrared sensors 202 provided in the car 202 Based on the signal from the vehicle control unit 210 that can transmit the above signal to the seat position detection unit 56, it is determined whether or not the user is a driver.
- radio remote control keys electronic keys
- the inter-vehicle distance detection unit 57 is a vehicle control unit 210 capable of transmitting signals from the front inter-vehicle distance sensor 203 and the rear inter-vehicle distance sensor 204 provided in the automobile 200 on which the user gets to the inter-vehicle distance detection unit 57.
- the distance from the vehicle ahead in the traveling direction or the distance from the vehicle behind in the traveling direction is detected based on the signal from the vehicle.
- the engine drive detection unit 58 is based on a signal from the vehicle control unit 210 that can transmit a signal from the engine rotation sensor 205 provided in the automobile 200 on which the user gets on to the engine drive detection unit 58.
- the engine 200 driving state is detected.
- the engine rotation sensor 205 a tachometer that detects the number of revolutions of the engine can be used.
- the wearing detection sensor is a sensor that determines whether or not the video display device 1 is worn on the user's head.
- the microphone 71 and the earphone 72 are used when inputting an instruction to the video display device 1 by voice.
- the communication unit 73 receives information on the antenna information for traffic information, television broadcasting, and radio broadcasting, and transmits / receives information on radio base stations.
- An automobile 200 shown in FIG. 4 includes an infrared sensor 202, a front inter-vehicle distance sensor 203, a rear inter-vehicle distance sensor 204, and an engine rotation sensor 205, and is communicably connected to the vehicle control unit 210.
- the automobile 200 may be configured to have a car navigation system including a GPS antenna and map information.
- FIG. 5 shows an example of a projection view inside the vehicle on which the user wearing the video display device 1 according to the present embodiment gets on.
- an electronic key 201 and a plurality of infrared sensors 202 are provided in the vehicle, and a front inter-vehicle distance sensor (not shown) for detecting the inter-vehicle distance from the vehicle ahead in the traveling direction, The distance between the rear vehicles that detects the distance between the vehicle behind the direction A distance sensor (not shown) is provided.
- the front inter-vehicle distance sensor and the rear inter-vehicle distance sensor an optical or electromagnetic distance detection sensor using a CCD or a laser radar, or a configuration similar to the distance measuring unit 52b can be used.
- the positioning unit 55 receives the signal of the GPS antenna power provided in the vehicle, and receives the signal from the vehicle control unit 210. Based on the received signal, the current position of the user is based on the longitude / latitude! Even a configuration that can measure the position.
- the control unit 60 includes a central processing unit (CPU) that controls the entire apparatus, a read only memory (ROM) that stores the control program, a random access memory (RAM) that temporarily stores data, a power supply Part.
- CPU central processing unit
- ROM read only memory
- RAM random access memory
- the power source unit is a power source in the video display device 1 such as the display unit 10, the image processing unit 40, the data input unit 50, the control unit 60, and the like.
- the power supply unit may be configured to supply power to each unit separately by a power cable or the like.
- the control unit 60 determines the imaging distance (target imaging distance) of the virtual image (optical image) to be displayed according to the state of the user (whether or not he is a driver). ) Is calculated and determined each time, and is an imaging distance control means for controlling the virtual image displayed at the determined target imaging distance to be displayed. It has necessary data, a conversion graph of the position of the display panel 13 with respect to the determined target imaging distance, a conversion graph of viewing angle with respect to speed, map information, and the like.
- FIG. 6 shows a conversion graph of the position of the display panel 13 with respect to the target imaging distance.
- FIG. 7 shows a conversion graph of viewing angle with respect to speed.
- the control unit 60 uses the object distance obtained based on the intrinsic visual condition of the user according to various data input from the data input unit 50, This is an imaging distance detecting means for obtaining an object distance obtained based on an external extrinsic external condition, and a target image distance setting means for setting a target imaging distance corresponding to the object distance.
- the distance to the visually recognized external object is obtained by actual measurement or estimation.
- the refractive power D is calculated by detecting the user's line-of-sight direction and measuring the measured value of the distance to the external object, and measuring the state of the cornea and lens of the user's eye or the state of the retinal image.
- the target distance 1 is calculated from the focal length F calculated as the reciprocal of the refractive power D and the distance d between the lens and the retina obtained from the size of the eyeball using Equation (1). is there.
- Measures to determine the object distance based on the external conditions are determined according to the relative speed change amount between the user and the external object, the moving direction, and the map information.
- the control unit 60 drives the gaze detection unit 52a to detect the gaze direction of the user, and drives the distance measurement unit 52b to detect the gaze direction detected. To measure the distance to the object present.
- the control unit 60 drives the cornea measurement unit 53a to measure the curved state of the cornea of the user's eye, and the refractive power of the cornea D1 is detected, and the lens measurement unit 53b is driven to detect the refractive power D2 of the user's lens. Then, the control unit 60 calculates the refractive power D of the entire eye of the user from the sum of the detected refractive power D1 of the cornea and the refractive power D2 of the crystalline lens.
- the reciprocal of the refractive power D is the focal length F of the optical system composed of the cornea and the crystalline lens, and the distance 1 between the crystalline lens and the retina is usually constant, so the object distance is obtained using equation (1).
- the control unit 60 uses the retinal image.
- the detection unit 54 is driven to measure the retinal image of the user's eye, and the refractive power D of the entire user's eye is detected.
- the reciprocal of refractive power D is the focal length F of the optical system consisting of the cornea and the lens, and the distance 1 between the lens and the retina is usually constant, so the object distance is calculated using equation (1).
- the control unit 60 includes the positioning unit. Drive 55 to detect the user's current position (latitude and longitude coordinates), and calculate the movement speed and direction.
- the control unit 60 calculates the viewing angle according to the calculated moving speed and reads the map information according to the detected current position.
- the external object building, sign, etc.
- the external object that occupies the maximum area included in the visual field range assumed from the viewing angle and map information is identified as the target object, and the distance to the specified target object is determined. Let the estimated value be the object distance. Note that when the object that occupies almost the entire area of the viewing field within the viewing angle is a space (for example, sky), the object distance is set to infinity.
- the control unit 60 determines the shortest object distance as the target imaging distance from the object distance determined in this way, and determines the position of the display panel 13 with respect to the determined target imaging distance.
- the target imaging position Z is set based on the conversion graph of the display panel position.
- the control unit 60 outputs an LCD drive instruction signal based on the set position of the display panel 13 to the LCD drive unit 13a.
- the LCD drive unit 13a moves the position of the display panel 13 in the optical axis direction based on the LCD drive instruction signal, so that a virtual image is displayed at the target imaging distance.
- the control unit 60 uses the position of the display panel 13 corresponding to the set target imaging distance as a reference.
- the position is set closer to the condenser lens 12 than the position (0 [ ⁇ m]), and an LCD drive instruction signal is output to the LCD drive unit 13a so that the display panel 13 is placed at the set position.
- the control unit 60 uses the position of the display panel 13 corresponding to the set target imaging distance as a reference. Set it to a position that is further away from the condenser lens 12 than the position (0 [ ⁇ m]), and the display panel 13 The LCD drive instruction signal is output to the LCD drive unit 13a so as to be arranged.
- FIG. 8 shows an operation flow for setting the target imaging distance in the present embodiment.
- control unit 60 After the power switch of video display device 1 is turned on, control unit 60 (after step S1)
- step S2 It is determined whether or not the mounting detection sensor is in the ON state, and it is determined whether or not the video display device 1 is mounted on the user's head (step S2).
- control unit 60 determines that the mounting detection sensor is not in the ON state, the control unit 60 determines that the video display device 1 is not mounted on the user's head (step S2; No) and is mounted. (Return to step S2).
- control unit 60 determines that the mounting detection sensor is in the ON state, the control unit 60 determines that the video display device 1 is mounted on the user's head (step S2; Yes), and the selection switch is turned on. To determine whether or not to adjust the imaging distance (step S3)
- control unit 60 determines that the imaging distance is not adjusted (step S3; No), and sets the target imaging distance to a predetermined reference. Set to the target image distance (step S4).
- the control unit 60 determines to adjust the imaging distance (Step S3; Yes), and determines whether the user is a driver (Step S3). S5).
- control unit 60 When determining whether or not the user is a driver, the control unit 60 makes a determination based on the signal from the seat position detection unit 56 that receives signals from the electronic key 201 and the infrared sensor 202.
- Step S5 determines that the user is not a driver
- the object distance according to the user's visual conditions gaze detection, cornea and lens measurement, retinal image measurement
- Step S6 the object distance according to the user's visual conditions (gaze detection, cornea and lens measurement, retinal image measurement)
- the shortest object distance is detected from the calculated object distances
- Step S8 the imaging distance of the virtual image.
- control unit 60 determines that the user is a driver (step S5; Yes)
- the virtual image conjugation distance is shorter than a predetermined set imaging distance. Nana! Set restrictions.
- the target imaging distance is limited to the nearest distance by setting a limit on the target imaging distance. By limiting so as not to approach too much, safety during driving can be ensured.
- control unit 60 determines whether or not the engine is driven based on a signal from the engine drive detection unit (after step S9). Step S10).
- step S10 When the control unit 60 determines that the engine is not driven (step S10; No), the object distance is calculated based on the user's visual conditions (gaze detection, cornea and lens measurement, retinal image measurement). Each process is performed (step S6), and the shortest object distance is detected among the calculated object distances (step S7), and the shortest object distance detected is determined as the imaging distance of the virtual image (target (Imaging distance) is determined (step S8).
- control unit 60 checks the detection means used to perform the target imaging distance (step S11).
- the control unit 60 includes each detection means (line-of-sight detection unit 52a, distance measurement unit 52b, cornea measurement unit 53a, lens measurement unit 53b, retinal image detection unit 54, positioning unit 55, seat position detection unit 56, inter-vehicle distance. The operation of the detection unit 57) is confirmed, and the detection means that transmits the normal value is set as the object distance detection means.
- the control unit 60 performs the object distance calculation process (step S12), detects the shortest object distance among the calculated object distances (step S13), and detects the shortest detected object distance.
- the short object distance is determined as the imaging distance (target imaging distance) of the virtual image (step S14). However, when the detected shortest object distance is shorter than the set imaging distance, the set imaging distance is determined as the target imaging distance.
- the control unit 60 sets the position of the display panel 13 with respect to the target imaging distance determined with reference to the conversion graph of the position of the display panel 13 with respect to the target imaging distance, and displays the display panel at the set position.
- the LCD drive instruction signal in which 13 is arranged is calculated (step S15), and the calculated LCD drive instruction signal is output to the LCD drive unit 13a.
- the LCD drive unit 13a displays the display parameters in accordance with the LCD drive instruction signal input from the control unit 60.
- the panel 13 is driven and the display panel 13 is arranged at the set position (step S16).
- FIG. 9 shows an operation flow of the object distance calculation processing based on the visual line detection that is the visual condition.
- the control unit 60 drives the line-of-sight detection unit 52a to perform the user's line-of-sight detection processing (step S21).
- the control unit 60 sets the line-of-sight direction detected from the line-of-sight detection unit 52a (step S22), and drives the distance detection unit 53 to perform distance measurement processing to an object existing in the set line-of-sight direction. Perform (step S23), and set the measured actual value as the object distance (step S24).
- FIG. 10 shows an operation flow of the object distance calculation processing based on the cornea and lens measurement as visual conditions.
- the control unit 60 drives the cornea measurement unit 53a to perform the measurement of the corneal curvature of the user, and detects the refractive power D1 of the cornea (step S31).
- the control unit 60 drives the lens measurement unit 53b to perform the refractive power measurement process of the user's lens, and detects the refractive power D2 of the lens (step S32).
- the control unit 60 calculates the sum of the detected refractive power D1 of the cornea and refractive power D2 of the crystalline lens as the refractive power D of the entire eye of the user (step S33).
- control unit 60 calculates the reciprocal of the calculated refractive power D to obtain the focal length F (step
- the control unit 60 calculates and sets the object distance 1 from the focal length F and the distance d between the lens and the retina (step S35).
- the lens refractive power D2 is detected after detecting the refractive power D1 of the cornea.
- the refractive power D1 of the cornea is detected.
- a cornea measurement unit 53a and a crystal measurement unit 53b are provided separately, and the refractive power D1 of the cornea and the refractive power D2 of the crystalline lens are individually provided.
- the detection unit includes the cornea measurement unit 53a and the lens measurement unit 53b, the refractive power D1 of the cornea and the refractive power D2 of the lens may be detected simultaneously.
- Figure 11 shows the operation flow of the object distance calculation process based on visual condition retinal image measurement. Indicates.
- the control unit 60 drives the retinal image detection unit 54 to perform detection processing of the user's retinal image, and detects the refractive power D of the entire user's eye (step S41).
- the control unit 60 calculates the reciprocal of the detected refractive power D and obtains the focal length F (step S42).
- the control unit 60 calculates and sets the object distance 1 from the focal length F and the distance d between the lens and the retina (step S43).
- FIG. 12 shows an operation flow of the object distance calculation process according to the relative speed change amount and the moving direction between the user and the external object, which are external conditions.
- the control unit 60 drives the positioning unit 55 to perform detection processing of the current position (latitude / longitude coordinates) of the user (step S51).
- control unit 60 calculates the moving direction and moving speed of the user (speed change relative to the outside world) (step S52).
- the control unit 60 drives the inter-vehicle distance detection unit 57 to detect the inter-vehicle distance from the preceding vehicle, and determines whether the detected inter-vehicle distance is greater than or equal to a preset reference inter-vehicle distance. Judgment is made (step S53).
- control unit 60 determines that the detected inter-vehicle distance is not greater than or equal to the reference inter-vehicle distance (step a)
- the detected inter-vehicle distance is set as the object distance (step S54).
- control unit 60 determines that the detected inter-vehicle distance is greater than or equal to the reference inter-vehicle distance (step 1)
- step S53 it is determined whether or not the moving speed is greater than or equal to the reference speed (step S55).
- control unit 60 determines that the moving speed is not equal to or higher than the reference speed (step S55; No)
- the reference target imaging distance is set as the object distance (step S56).
- control unit 60 determines that the moving speed is equal to or higher than the reference speed (step S55; Yes)
- step S57 Referring to the conversion graph of viewing angle with respect to speed, set the viewing angle with respect to moving speed (step S57).
- the control unit 60 reads map information based on the detected current position (step S58), and determines an object from the read map information and the set viewing angle (step S59).
- the control unit 60 calculates the distance to the object determined from the current position and the map information, and calculates the distance.
- the distance to the extracted object is set as the object distance (step S60).
- the imaging distance of the virtual image can be dynamically adjusted to a position preferable for the user, the fatigue of the user can be reduced, and the user's usability is improved with safety.
- the video display device 1 can be realized.
- the imaging distance at which the virtual image is displayed can be set, and the external object and the virtual image focused by the user can be set simultaneously.
- An image display device 1 that can be visually recognized can be realized.
- the imaging distance can be set based on the user's external conditions (moving direction and moving speed), a virtual image can be displayed at the viewing position according to the external conditions, The video display device 1 that can ensure safety can be realized.
- the present invention is effective not only for automobiles but also for operation of construction machines such as cranes.
- the display can show the status of the construction machine or the video of the work taken from a position other than the operator.
- the object of the present invention described above is to realize a video display device that can dynamically adjust the imaging distance of a virtual image to a focus that is favorable for the user and improve the usability of the user. .
- the present invention is not limited to the contents of the above-described embodiment, and can be appropriately changed within the scope without departing from the gist of the present invention.
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