CN103487938A - Head mounted display - Google Patents
Head mounted display Download PDFInfo
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- CN103487938A CN103487938A CN201310380202.9A CN201310380202A CN103487938A CN 103487938 A CN103487938 A CN 103487938A CN 201310380202 A CN201310380202 A CN 201310380202A CN 103487938 A CN103487938 A CN 103487938A
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Abstract
The invention discloses a head mounted display which comprises a main frame, a perspective type optical display system, a main control system and a binocular three-dimensional visual system. The perspective type optical display system comprises an image display module, an optical amplification system and a fine adjusting mechanism. The binocular three-dimensional visual system shoots a target object in front of the human eyes and acquires the distance between the target object and the human eyes through a parallax principle distance measuring method. The main control system controls the perspective type optical display system to automatically adjust the distance from the virtual image to the human eyes according to the obtained distance from the target object to the human eyes, therefore, the comfortableness of eye using when a user uses image displayers is ensured, and eyestrain can be relieved. Further, in the augmented reality application, when the depth of field changes, the distance between the virtual image and the human eyes is adjusted automatically to enable the virtual image to fit with the actual environment, the enhanced display effect can be truly achieved, and user experience can be enhanced greatly.
Description
Technical field
The present invention relates to wearable computing and wear field of display devices, relate in particular to a kind of head-wearing display device.
Background technology
Existing HMD(HeadMountDisplay, the wear-type visual device) display system of virtual reality/augmented reality, because optical presentation system is apart from design according to a fixed imaging, therefore the virtual image that image source shows in human eye the place ahead after optical presentation system is fixed apart from the distance of human eye, if such HMD equipment is applied for augmented reality, due to the virtual image apart from human eye the distance be constant, and environment of living in is time changing, the virtual image of seeing by these display systems is exactly showy skyborne, with actual environment, break away from, not only can not reach real enhancing display effect, and the user experiences extreme difference.
Summary of the invention
The purpose of this invention is to provide a kind of head-wearing display device, solve the existing distance nonadjustable defect of the display optical system virtual image apart from human eye of wearing, can be far and near to the distance of human eye according to object, automatically regulate the distance of the virtual image to the human eye distance, the virtual image and actual environment are better merged.
In order to realize the foregoing invention purpose, the invention provides a kind of head-wearing display device, comprise main body frame, perspective formula optical presentation system, master control system and Binocular Stereo Vision System, the perspective formula optical presentation system comprises image display, optical amplification system and micro-adjusting mechanism;
Binocular Stereo Vision System is taken the object in human eye the place ahead, utilizes the method for principle of parallax range finding, obtains the distance of object to human eye;
Master control system is the distance to human eye according to the object obtained, control micro-adjusting mechanism and adjust the axial distance of image display and optical amplification system, and/or control the focal length that micro-adjusting mechanism is adjusted optical amplification system, make the virtual image equal the distance of object to human eye to the human eye distance.
Wherein, Binocular Stereo Vision System comprises two video camera or video cameras that move that focal length is identical, and object calculates with following formula apart from Z apart from video camera:
Wherein, T is the baseline distance, and f is focal length of camera, x
l, x
rbe respectively object through x coordinate in left image and right image, and object is apart from human eye distance L=Z+h, h is that video camera is apart from the human eye distance.
Wherein, the embedded optical index computing module of described master control system, the distance value using object to human eye is input optical index computing module as the virtual image to the human eye distance value, and the optical index computing module calculates automatically needs the optical index of adjusting; Master control system is converted to the discernible instruction of micro-adjusting mechanism by the optical index of the needs adjustment that calculates, to control micro-adjusting mechanism, relevant optical is finely tuned.
In the present invention, the focal length of described adjustment optical amplification system, can select one of following two kinds of modes:
1) change the position relationship of each optical element in optical amplification system with micro-adjusting mechanism, to adjust the focal length of optical amplification system.
2) the one or more optical elements in described optical amplification system adopt liquid lens, and micro-adjusting mechanism changes liquid form to liquid lens impressed voltage or micro-adjusting mechanism by mechanical force, realize adjusting the focal length of optical amplification system.
Preferably, when the axial distance by adjustment image display and optical amplification system, or while by the position relationship that changes each optical element in optical amplification system, adjusting the focal length of optical amplification system, described micro-adjusting mechanism adopts screw thread pair transmission fine-tuning mode, each optical module that need to move is installed one group of micro-adjusting mechanism, and every group of micro-adjusting mechanism comprises driving control panel, micro-step motor, gear pair, rotating screw bolt, travelling nut seat; Need mobile optical module to be fixed on the travelling nut seat, micro-step motor, under the driving that drives control panel, drives the rotating screw bolt in screw thread pair to rotate to drive moving axially of travelling nut seat in the gear pair mode.
Compared with prior art, the present invention has following beneficial effect:
The head-wearing display device virtual image of the present invention can the distance to human eye adjust according to object automatically apart from the distance of human eye, can guarantee to greatest extent user's comfort level with eye when using these image displays, alleviates visual field fatigue; And in the augmented reality application, when the depth of field changes, automatically regulate the distance of the virtual image apart from human eye, make the virtual image and actual environment laminating, can reach real enhancing display effect, can greatly strengthen user's experience.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing:
A kind of structural representation that Fig. 1 is embodiment of the present invention head-wearing display device;
A kind of detailed construction schematic diagram that Fig. 2 is Fig. 1;
Fig. 3 is embodiment of the present invention binocular stereo vision basic principle schematic;
A kind of structural representation that Fig. 4 is perspective formula optical presentation system in embodiment of the present invention head-wearing display device;
A kind of structural representation that Fig. 5 is micro-adjusting mechanism in Fig. 4;
Mark in figure: 1-main body frame, 2-perspective formula optical presentation system, 3-Binocular Stereo Vision System, the 4-master control system, 5-virtual image position, 21-image display, the 22-optical amplification system, 23-micro-adjusting mechanism, the left camera of 31-, the right camera of 32-, 61-drives control panel, 62-micro-step motor, the 63-gear A, the 64-gear B, 65-rotating screw bolt, 66-travelling nut seat.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The structural representation that is embodiment of the present invention head-wearing display device referring to Fig. 1, Fig. 2, described head-wearing display device, comprise being that binocular is worn real device shown in main body frame 1, perspective formula optical presentation system 2(Fig. 1,2, therefore two perspective formula optical presentation systems are arranged), Binocular Stereo Vision System 3 and master control system 4, perspective formula optical presentation system 2 comprises that image display 21, optical amplification system 22 and micro-adjusting mechanism 23(are referring to Fig. 2 and 4).Binocular Stereo Vision System 3 is taken the object in human eye the place ahead, utilize the method for principle of parallax range finding, obtain the distance of object to human eye, Binocular Stereo Vision System 3 can consist of two identical video cameras of focal length, also can consist of the video camera of a motion, video camera 31 and video camera 32 that the Binocular Stereo Vision System shown in Fig. 2 is identical by focal length form; Master control system 4 is the distance to human eye according to the object obtained, control micro-adjusting mechanism 23 and adjust the axial distance of image display 21 and optical amplification system 22, and/or control the focal length that micro-adjusting mechanism 23 is adjusted optical amplification system 22, make the virtual image equal the distance of object to human eye to the human eye distance.
The parallax range measurement principle schematic diagram of Binocular Stereo Vision System 3 is referring to Fig. 3, Binocular Stereo Vision System 3 can consist of twin camera, also can be formed by the single camera of a motion, twin camera obtains two width digital pictures of measured object from different perspectives simultaneously, and single camera is in the two width digital pictures that do not obtain from different perspectives in the same time measured object, and recover the three-dimensional geometric information of object based on principle of parallax, rebuild object three-dimensional contour outline and position.In Fig. 3, O
l, O
rbe respectively twice camera site in two positions, video camera left and right or single camera front and back; T is the baseline distance, and baseline refers to apart from T the level interval that two video cameras are arranged side by side, or the spacing of the twice photographic subjects object in motion cameras front and back; The focal length that f is two video cameras; P is the object position; x
l, x
rbe respectively the x coordinate of object in left image and right image; Object calculates with following formula apart from Z apart from video camera:
In the present invention object to the distance L of human eye equal object apart from video camera apart from the Z+ video camera apart from the human eye distance h, object calculates with following formula apart from the human eye distance L:
The embedded optical index computing module of embodiment of the present invention master control system 4, distance value using object to human eye is input optical index computing module as the virtual image to the human eye distance value, the optical index computing module is optimized processing, automatically calculates and needs the optimum optical index of adjusting; Master control system is converted to the discernible instruction of micro-adjusting mechanism by the optical index of the needs adjustment that calculates, to control micro-adjusting mechanism, relevant optical is finely tuned.
Referring to Fig. 4, it is a kind of structural representation of perspective formula optical presentation system in embodiment of the present invention head-wearing display device; Perspective formula optical presentation system 2 comprises image display 21, optical amplification system 22 and micro-adjusting mechanism 23, image display 21 is for Display control computer synthetic image CGI image (image source), and embodiment of the present invention image display 21 can be OLED, LCD or LCos display; 22 pairs of image sources of optical amplification system play amplification, the passage that simultaneously optical combiner in optical amplification system 22 enters human eye as turnover and the external environment light of light path makes human eye can observe enlarged image source and external environment by whole optical amplification system 22 simultaneously.In Fig. 4, the axial distance between image display 1 and optical amplification system 22 means with L1, and the virtual image means with L4 to the distance of human eye.In embodiment of the present invention Fig. 4, only in image display 21, one group of fine tuning structure has been installed, when actual design, each optical module that need to move all needs to install one group of micro-adjusting mechanism, and those skilled in the art's 4 complete deducibilitys with reference to the accompanying drawings go out to install other accompanying drawings of organizing micro-adjusting mechanisms more.
In the embodiment of the present invention, the virtual image can realize by following several modes to the adjusting of the distance L 4 of human eye:
1) regulate the axial distance L1 between image display 21 and optical amplification system 22, this crosses range request and keeps the distance of display module 21 and optical amplification system 22 in one times of focal range of optical amplification system 22;
2) regulate the focal length of optical amplification system 22;
3) above two kinds of methods is combined with.
Wherein, adjust the focal length of optical amplification system 22, can select one of following two kinds of modes:
A. change the position relationship of each optical element in optical amplification system 22 with micro-adjusting mechanism 23, to adjust the focal length of optical amplification system;
B. the one or more optical elements in described optical amplification system 22 adopt liquid lens, and micro-adjusting mechanism 23 changes liquid form to liquid lens impressed voltage or micro-adjusting mechanism by mechanical force, realize adjusting the focal length of optical amplification system.
In the embodiment of the present invention, micro-adjusting mechanism 23 can be different according to demand, be designed to different structures, for example: when the axial distance of the embodiment of the present invention by adjustment image display 21 and optical amplification system 22, or while by the position relationship that changes each optical element in optical amplification system 22, adjusting the focal length of optical amplification system, micro-adjusting mechanism 23 preferably adopts screw thread pair transmission fine-tuning mode, referring to Fig. 5, every group of micro-adjusting mechanism 23 comprises driving control panel 61, micro-step motor 62, gear pair (gear A 63, gear B 64), rotating screw bolt 65, travelling nut seat 66, rotating screw bolt 65 and travelling nut seat 66 form screw thread pair.Need mobile optical module to be fixed on travelling nut seat 66, each optical module that need to move is installed one group of micro-adjusting mechanism (Fig. 4 take image display 21 be installed on travelling nut seat 66 be example), micro-step motor 62 is under the driving that drives control panel 61, in the gear pair mode, drive rotating screw bolt 65 rotations in screw thread pair to drive moving axially of travelling nut seat 66, thereby drive the optical module operation be fixed on travelling nut seat 66.
And when the present invention changes the focal length of optical amplification system by liquid lens, micro-adjusting mechanism 23 just can not be with above-mentioned screw thread pair drive mechanism, and need corresponding being designed to or to add the structure of mechanical force to the liquid lens impressed voltage, and now micro-adjusting mechanism is connected with optical amplification system.
The above has described each modular construction and the principle of embodiment of the present invention head-wearing display device, below, take and only finely tune the image display axial distance as example, illustrate how the embodiment of the present invention regulates the virtual image to the human eye distance automatically according to the depth of field, and detailed process is:
A: Binocular Stereo Vision System is taken the object in human eye the place ahead, utilizes the Binocular Stereo Vision System range measurement principle, calculates the distance L 4 of the virtual image to human eye;
B: to the distance L 4 of human eye, calculate L1 value according to the virtual image, obtain the △ L1 data that need output (difference of former L1 value and the L1 that newly calculates), △ L1 data are converted into to pulse signal, and export pulse number, umber of pulse is passed to the single-chip microcomputer on drive plate;
C: drive the Single Chip Microcomputer (SCM) program on control panel to control the driver of micro-step motor according to the umber of pulse obtained, micro-step motor is stablized and turned over given step number; Micro-step motor by moment with rotate and to pass to the fine setting screw rod and realize the fine setting of image display, and then realizes that the virtual image arrives the adjusting of human eye distance by gear pair.
Head-wearing display device of the present invention, the virtual image can the distance to human eye adjust according to object automatically apart from the distance of human eye, can guarantee to greatest extent user's comfort level with eye when using these image displays, alleviates visual field fatigue; And in the augmented reality application, when the depth of field changes, can make the virtual image and actual environment laminating by regulating the distance of the virtual image apart from human eye, can reach real enhancing display effect, can greatly strengthen user's experience.
Disclosed all features in this instructions, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing), unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is,, unless special narration, each feature is an example in a series of equivalences or similar characteristics.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosed in this manual, and the arbitrary new method disclosed or step or any new combination of process.
Claims (6)
1. a head-wearing display device, is characterized in that, comprises main body frame, perspective formula optical presentation system, master control system and Binocular Stereo Vision System, and the perspective formula optical presentation system comprises image display, optical amplification system and micro-adjusting mechanism;
Binocular Stereo Vision System is taken the object in human eye the place ahead, utilizes the method for principle of parallax range finding, obtains the distance of object to human eye;
Master control system is the distance to human eye according to the object obtained, control micro-adjusting mechanism and adjust the axial distance of image display and optical amplification system, and/or control the focal length that micro-adjusting mechanism is adjusted optical amplification system, make the virtual image equal the distance of object to human eye to the human eye distance.
2. head-wearing display device as claimed in claim 1, is characterized in that, Binocular Stereo Vision System comprises two video camera or video cameras that move that focal length is identical, and object calculates with following formula apart from the human eye distance L:
Wherein, h be video camera apart from the human eye distance, Z be object apart from the video camera distance, T is the baseline distance, f is focal length of camera, x
l, x
rbe respectively the x coordinate of object in left image and right image.
3. head-wearing display device as claimed in claim 2, is characterized in that, the focal length of described adjustment optical amplification system further comprises: change the position relationship of each optical element in optical amplification system with micro-adjusting mechanism, to adjust the focal length of optical amplification system.
4. head-wearing display device as described as the claims 1 to 3 any one, it is characterized in that, when the axial distance by adjustment image display and optical amplification system, or while by the position relationship that changes each optical element in optical amplification system, adjusting the focal length of optical amplification system, described micro-adjusting mechanism adopts screw thread pair transmission fine-tuning mode, each optical module that need to move is installed one group of micro-adjusting mechanism, and every group of micro-adjusting mechanism comprises driving control panel, micro-step motor, gear pair, rotating screw bolt, travelling nut seat; Need mobile optical module to be fixed on the travelling nut seat, micro-step motor, under the driving that drives control panel, drives the rotating screw bolt in screw thread pair to rotate to drive moving axially of travelling nut seat in the gear pair mode.
5. head-wearing display device as claimed in claim 1 or 2, it is characterized in that, one or more optical elements in described optical amplification system adopt liquid lens, micro-adjusting mechanism changes liquid form to liquid lens impressed voltage or micro-adjusting mechanism by mechanical force, realizes adjusting the focal length of optical amplification system.
6. head-wearing display device as claimed in claim 1 or 2, it is characterized in that, the embedded optical index computing module of described master control system, distance value using object to human eye is input optical index computing module as the virtual image to the human eye distance value, and the optical index computing module calculates automatically needs the optical index of adjusting; Master control system is converted to the discernible instruction of micro-adjusting mechanism by the optical index of the needs adjustment that calculates, to control micro-adjusting mechanism, relevant optical is finely tuned.
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