Background technology：
As the display terminal of virtual reality, VR Helmet Mounted Displays be by image caused by small two-dimension display byOptical system is amplified, and the light that miniscope is launched makes image because refraction produces similar distant place effect by convex lens,Near objects are amplified to using this effect and views and admires at a distance and reaches so-called panoramic vision.VR Helmet Mounted Display abbreviations VRHead is aobvious, mainly point three classes：VR glasses, the VR helmets and VR all-in-ones.
VR glasses, it is the headset equipment (Mobile VR) of the mobile phone with glasses box, representational equipment hasGoogle Cardboard, Gear VR and storm wind witch mirror, although it is good to experience no VR helmets, because its cost is lowHonest and clean, portable and convenient operation, with the fast lifting of smart mobile phone performance, is turning under current technical conditionsThe main flow that the VR helmets are shown.
The VR helmets, it is necessary to which connect computer immerses headset equipment (HMD), and its representative is exactly Oculus Rift, SonyPlayStation VR, and HTC/Valve VIVE), the VR helmets it is leading at this stage be Game Market.
VR all-in-ones, its design have taken into account light and performance, have allowed user to break away from the constraint of external equipment, built-in placeReason device, internal memory, display screen can meet the needs of most game and video are to hardware, and cost is higher.
Shown using the VR heads of Binocular displays, its display content includes 2D/3D films, 360 ° of panoramic videos, roaming,Picture, VR game etc., these contents can be divided into 2D and the major classes of 3D two.Binocular displays 3D rendering, due to binocularParallax, third dimension is strongly；Binocular displays 2D images, due in the absence of binocular parallax, weakening image in itselfThird dimension.No matter video display, image, or VR pan-shots, 2D contents are and current far more than 3D contentsVR Helmet Mounted Displays do not have this concept of single eye stereo vision, even panoramic video also inhibits part by Binocular displaysTelepresenc, this viewing for the 2D movie and television contents of magnanimity is very unfavorable.The present invention is by single eye stereo vision applicationIn VR heads are aobvious, third dimension and feeling of immersion that lifting 2D contents are shown.
The content of the invention：
The invention discloses the principle and method of a kind of changeable VR Helmet Mounted Displays of monocular binocular, it is therefore intended that by aobviousShow switching, the 3D videos and image of high-resolution can be not only played with binocular, can also be by way of single eye stereo vision2D video display and panoramic video are played, improves third dimension and feeling of immersion.
In order to illustrate single eye stereo vision can improve 2D movie and television contents third dimension and feeling of immersion, it is necessary to simply illustrate three-dimensionalThe mechanism and foundation of vision.
Human stereo vision can be divided into binocular stereo vision and single eye stereo vision.Because spacing be present in two eyes of people,Average value is 6.5cm, and for same scenery, the relative positions of right and left eyes is different, this generates binocular parallax,That is right and left eyes form binocular stereo vision it is seen that discrepant image, is merged in the brain, and binocular parallax is notWhole foundations that stereoscopic vision is formed, but be most strong in various factors；Motion parallax is by observer and scenery hairCaused by raw relative motion, this motion makes the size of scenery and position be changed in the projection of retina, makes productionRaw depth perception, can form single eye stereo vision, stereo perception caused by motion parallax is weaker than binocular parallax；Human eye isFine-tune to focus on by crystalline lens, the change of focal length allows us to see far and near different scenery, focuses onFunctioned both in binocular stereo vision and single eye stereo vision are formed, stereo perception caused by focusing is weaker than binocular parallaxAnd motion parallax.
The objective factors such as linear perspective, shadow distribution, air scattering, color, background density, composition, and peopleThe experience of life is memory of the Stereo Vision of objective object in human brain, can also help people to establish and strengthen three-dimensionalVision.In addition, completely cut off image boundary using increase visual field in VR is shown and the method in the extraneous visual field, reduction are emphasizedThe environmental factor of the plane of delineation, stereoscopic visual effect can also be strengthened.In a word, stereoscopic vision is many factors synthesisThe result of effect.
VR shows that 2D/3D has three kinds of modes：
A. eyes see 3D rendering, have binocular parallax, third dimension is strongly；
B. eyes see 2D images, due in the absence of binocular parallax, enhancing the flatness of display in itself, weakening imageThird dimension, particularly close shot and feature, shifted onto by force at a distance, occurred " giant's phenomenon ", lose tentacleCan and sensation；
C. it is simple eye to see 2D images, when particularly seeing 2D video display, 2D panoramic videos, due to the presence of motion parallax, have veryGood third dimension and feeling of immersion.
First two mode need not switch, and be the aobvious display methods used of current VR heads, and the present invention switches monocular binocularBe applied to VR heads it is aobvious in, realize the monocular stereoscopic display of 2D contents.The switching of monocular binocular can use two kinds of software and hardwareMethod is realized.
Software chang-over method is to set handoff functionality to realize in VR plays APP：
A. when broadcasting content is 3D rendering and video, 3D rendering on the double screen of left and right to showing simultaneously；
B. when broadcasting content is 2D images and video, 2D images are shown simultaneously on the double screen of left and right；
C. when broadcasting content is 2D videos, alternately single screen shows that not shown screen is arranged to black, such as on the screen of left and rightShown in Fig. 1；
D. when broadcasting content is 2D videos, one in closing left and right screen, single screen is shown.
It is only to need the installation APP on VR heads are aobvious to can be achieved with the switching of monocular Binocular displays, letter using the advantages of software exchangeSingle easy, pent screen black background does not reach black when being disadvantageous in that monocular display, our eyeIt is seen that grey, the 2D images seen with another eyes are harassed in brains in the presence of slight in eyeball.
Hardware exchange method is that shutter is set in two groups of the left and right light path that VR heads show, and shutter can see correspondingly when openingScreen picture, corresponding screen picture is can't see during shutter close, monocular Binocular displays are realized by the break-make of shutterSwitching.Shutter can be arranged on any position of light path using mechanically or electrically minor structure, the position of shutter, considerThe design feature shown to VR heads, we use liquid crystal light valve shutter, and shutter is positioned close into eyepiece (5) place, such as schemeShown in 2.Liquid crystal light valve shutter can also be used cooperatively with software chang-over method, accordingly even when liquid crystal light valve occurs slightlyLight leak, be also not in harass.The control signal and voltage of liquid crystal light valve shutter can be shown by VR heads or smart mobile phoneUSB port provides.
Identical with software chang-over method, hardware exchange can also realize above-mentioned 4 kinds of displays, it is apparent that the third left and right is alternateMonocular stereo display method is recommendable, sets suitable alt time T, and monocular, which is shown, brings third dimension with immersingThe lifting highly significant of sense, caused visual fatigue are smaller.The purpose that alternately monocular is shown is for simple eye viewing of releivingCaused visual fatigue, therefore make periodically alternately to be not required in that, in playing process, alt time T can becomeChange, as long as meeting：Do not cause and alternately flash, monocular stereo vision can be achieved, simple eye visual fatigue can be mitigated.ExaminationTest and show, T is appropriate in the scope of 2~30 seconds, and alt time can be adjusted according to the degree of fatigue of right and left eyes, may be used alsoSo that more display times are distributed into the preferable dominant eye of eyesight.
Brief description of the drawings：
Fig. 1 is that VR heads show single screen alternately display 2D video time diagrams.
Fig. 2 is that VR heads show liquid crystal light valve shutter schematic view of the mounting position.
Shown by reference numeral in above-mentioned each accompanying drawing is：
1VR heads show right screen, and 2VR heads show left screen, and 3VR heads show optical system, 4 separation baffles, 5 eyepieces, 6 liquid crystal light valvesRight mirror, the left mirror of 7 liquid crystal light valves, the optical axis of 8 amplification light paths, 9 human eyes, 10 right eye visual fields, 11 left eye visual fields.
The changeable VR Helmet Mounted Displays of monocular binocular disclosed by the invention, realize monocular using simple and easy method and standBody shows that the 2D movie and television contents that magnanimity is watched for people provide a kind of approach and experience that presence is had more than IMAX；Allow 360 ° of pan-shot contents really embody it is three-dimensional, immerse with it is striking can and sensation；From mobile phone, camera, shootingStrong third dimension can be also experienced on the common 2D videos of machine shooting.The changeable VR Helmet Mounted Displays of monocular binocular are realPeople are allowed to experience VR ubiquitous.