CN203433192U - Head mounted display HMD - Google Patents

Abstract

The utility model discloses a head mounted display HMD. The HMD comprises a lens rack, a display system and a control system, wherein the display system comprises a micro image display, a curved surface prism, a compensation prism and a pixel level visual permeability rate adjustable display screen, wherein the curved surface prism is a free curved surface prism with three optical surfaces, and viewed from a viewer, the compensation prism is arranged on the outer side of the curved surface prism and optically cemented with the curved surface prism; the micro image display is used for displaying computer generated images CGI, and the pixel level visual permeability rate adjustable display screen is arranged on the outer side of the compensation prism and used for controlling the proportion of the external scene light ray into the eyes. The special optical system structure of the HMD makes the exit pupil diameter large and makes the distortion small. The visual permeability rate can be controlled in the pixel level, the requirements of users for HMD comfort degree, definition or the like are met to the maximum extent, the eye fatigue due to using the HMD is lightened, and the availability of the HMD is greatly improved.

Description

A kind of head-wearing display device HMD

Technical field

The utility model relates to wearable computing and wears field of display devices, relates in particular to a kind of head-wearing display device HMD.

Background technology

Head-mounted display (HMD, Head mounted display) claim again HUD (HUD, Head up display), be a kind of nearly eye display device that at least comprises a micro display device (image source system), corresponding optical system and supporting structure (back-up system).Depending on saturating formula HMD, there is its special man-machine interaction characteristic, can, in conjunction with augmented reality, be widely used in the every field such as scientific research, military affairs, industry, game, video, education, emulation.Optical system plays key effect in HMD, if well the differing and distorting of corrective system of optical system, what user saw will be distortion and unsharp image, and in prior art, distortion correction effect is all general.In addition under different photoenvironments, also directly determine that user is to the Experience Degree of HMD (what describe depending on saturating rate is the effect of looking depending on saturating formula HMD) depending on whether saturating rate is suitable.Existingly depending on saturating formula HMD, conventionally adopt semi-transparent semi-reflecting membrane technology or liquid crystal light valve to realize the control to saturating formula rate, the optical parametric of semi-transparent semi-reflecting film is fixed, and once completing, it is also determined the attenuation degree of light thereupon, can not be adjusted automatically.That is to say, we cannot make 50/50 plated film, both realized transmissivity and reflectivity each 50%, realize again 60% transmissivity and 40% reflectivity.And the liquid crystal layer integral body of brilliant light valve is a large pixel, so liquid crystal light valve is to take the liquid crystal panel of light valve as square measure to the adjusting depending on saturating rate, cannot reach the adjusting that Pixel-level is looked rate.

Utility model content

The purpose of this utility model is to provide a kind of head-wearing display device HMD, solves existing HMD optical system and looks the defect in rate adjusting problem, realizes the adjusting that Pixel-level is looked rate.

In order to realize above-mentioned utility model object, the utility model provides a kind of head-wearing display device HMD, comprise mirror holder, display system and control system, described display system comprises that miniature image display, curved surface prism, compensating prism and Pixel-level look rate adjustable display screen, described curved surface prism is the free curved surface prism with three optical surfaces, from observer's side, compensating prism is positioned at curved surface prism outside, and compensating prism and curved surface prism optical veneering; Pixel-level is positioned at compensating prism outside depending on saturating rate adjustable display screen; Miniature image display is for Display control computer synthetic image CGI image, Pixel-level is injected the ratio of human eye for controlling extraneous scene light depending on saturating rate adjustable display screen, the light that miniature image display sends first enters curved surface prism through the first surface transmission of curved surface prism, then in the inner side of second surface, there is total reflection, again through the 3rd surface reflection, finally through second surface, transmission enters human eye again, and the 3rd surface of described curved surface prism is coated with part reflective semitransparent film; First extraneous scene light look the transmission of rate adjustable display screen through Pixel-level, then through the transmission of compensating prism second surface, enters compensating glass, and then the 3rd surface and the second surface through compensating prism first surface, curved surface prism enters human eye.

Preferably, the face type of the first surface of compensating prism and second surface respectively with the second surface of curved surface prism, the face type on the 3rd surface is identical.

Preferably, the face type of three of curved surface prism optical surfaces equation that meets the following conditions:

$\begin{array}{c}z(x,y)=\frac{C(x^2+y^2)}{1+\sqrt{1-(1+k)C^2(x^2+y^2)}}\\ +c_4{x}^2+c_6{y}^2\\ +c_8{x}^{2}y+c_{10}{y}^3\\ +c_{11}{x}^4+c_{13}{x}^2{y}^2+c_{15}{y}^4\\ +c_{17}{x}^{4}y+c_{19}{x}^2{y}^2+c_{21}{y}^5\\ +...\end{array}$

Wherein C is curvature of curved surface radius, c_jfor multinomial coefficient.

Preferably, described control system comprises memory module, control processor, display module circuit and peripheral circuit, wherein: display module circuit comprises graphic process unit, graphic process unit output two-path video signal, one tunnel provides CGI image for miniature image display, and another road is that Pixel-level is provided for controlling the picture signal of the rate of looking depending on saturating rate adjustable display screen; Peripheral circuit comprises external communication interface, and for carrying out alternately with head-wearing display device, described external communication interface comprises one or more in Wi-Fi, bluetooth, GPS, GPRS, USB.

Preferably, described HMD also comprises the photosensitive device for perception environmental light intensity, photosensitive device sends to graphic process unit by intensity signal through control processor, graphic process unit regulates depending on the whole region of the saturating rate adjustable display screen rate of looking Pixel-level according to intensity signal, sets in advance light intensity and the mapping relations of looking rate in described control system.

Preferably, graphic process unit, according to the region that is lit of the miniature image display detecting, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

Preferably, graphic process unit presents area information according to the virtual information that extracts from application program on miniature image display, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

Preferably, graphic process unit, according to one or more in user speech, gesture, touch instruction, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

Preferably, described Pixel-level is transparent monochromatic LCD display or transparent monochromatic OLED display screen depending on saturating rate adjustable display screen.

Preferably, described miniature image display is a kind of in LCD display, OLED display screen, LCoS display screen.

Compared with prior art, the utlity model has following beneficial effect:

The HMD of the utility model embodiment, adopt the free curved surface prism of three optical surfaces in conjunction with compensating prism on the one hand, make the optical system exit pupil diameter of whole HMD large, distort little, adopted on the other hand a Pixel-level to control the rate of looking that regulates HMD depending on the display screen of saturating rate, can farthest meet the demand of user to aspects such as HMD comfort level, sharpness, reduce sense of fatigue when HMD is used, eyes being caused, improve greatly the availability of HMD.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing:

Fig. 1 is a kind of structural representation of the utility model embodiment head-wearing display device HMD;

Fig. 2 is the structural representation of the display system in the utility model embodiment head-wearing display device;

Fig. 3 a is the MTF curve of display system in the utility model embodiment head-wearing display device;

Fig. 3 b is the distortion curve of display system in the utility model embodiment head-wearing display device;

Fig. 4 is the structural representation of control system in the utility model embodiment head-wearing display device;

Fig. 5 is the method flow schematic diagram that the utility model embodiment head-wearing display device regulates the rate of looking;

Fig. 6 a is the utility model embodiment when surround lighting is weak, emphasizes that joint looks the effect schematic diagram of rate;

Fig. 6 b be the utility model embodiment when surround lighting is stronger, emphasize that joint looks the effect schematic diagram of rate;

Fig. 7 a is the utility model Embodiment C GI display area schematic diagram;

Fig. 7 b is that the utility model embodiment regulates the effect schematic diagram of the rate of looking according to the CGI display area of Fig. 5 a;

Fig. 8 a is the utility model embodiment A R viewing area schematic diagram;

Fig. 8 b is that the utility model embodiment regulates the effect schematic diagram of the rate of looking according to the AR viewing area in Fig. 6 a;

Mark in figure: 1-miniature image display, 2-curved surface prism first surface, 3-curved surface prism second surface, 4-curved surface prism the 3rd surface, the first surface of 5-compensating prism, the first surface of 6-compensating prism, 7-Pixel-level is looked rate adjustable display screen, 10-mirror holder, 20-display system.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.

HMD described in the utility model embodiment can be monocular HMD, can be also binocular HMD, when being monocular, only has one group of display system, and binocular has two groups of display systems.Described in the utility model embodiment is exactly transmissivity depending on saturating rate, high depending on saturating rate, and reflectivity is just low.

Referring to Fig. 1, a kind of structural representation for the utility model embodiment head-wearing display device HMD, comprisemirror holder 10,display system 20 and control system (control system is not shown in Fig. 1), that Fig. 1 illustrates is binocular HMD, there are two groups of identical display systems, the structural representation of every group of display system can be referring to Fig. 2, comprises that miniature image display 1, curved surface prism, compensating prism and Pixel-level look rate adjustable display screen 7.In Fig. 2,8 is emergent pupil, i.e. position of human eye; Described curved surface prism is the free curved surface prism with three optical surfaces, from image source to observer's direction, is followed successively byfirst surface 2,second surface 3, the threesurfaces 4, and wherein the3rd surface 4 is coated with part reflective semitransparent film; Described compensating prism comprises two optical surfaces, be respectivelyoptical surface 5 and 6,5 are also called the first surface of compensating prism, 6 are also called the second surface of compensating prism, thefirst surface 5 of compensating prism and second surface 6 respectively with thesecond surface 3 of curved surface prism, the face type on the3rd surface 4 identical (be thatface 5 is identical with 3 types of face, 4 types of face 6 and face are identical).From observer's side, compensating prism is positioned at curved surface prism outside, compensating prism and curved surface prism optical veneering; Pixel-level is positioned at compensating prism outside depending on saturating rateadjustable display screen 7, injects the ratio of human eye for controlling extraneous scene light; Miniature image display 1 is positioned at the outside of curved surface prismfirst surface 2, for Display control computer synthetic image CGI image.The actual light path of Fig. 2 display system is divided into two-way, be respectively: the light that 1) miniature image display 1 sends first enters curved surface prism throughfirst surface 2 transmissions of curved surface prism, then in the inner side ofsecond surface 3, there is total reflection, through the3rd surface 4 reflections, finally through second surface, 3 transmissions enter human eye again again; 2) first extraneous scene light look 7 transmissions of rate adjustable display screen through Pixel-level, then through 6 transmissions of compensating prism second surface, enters compensating glass, and then the3rd surface 4 and thesecond surface 3 through compensating prismfirst surface 5, curved surface prism enters human eye.

In the utility model embodiment, the face type of three optical surfaces of the curved surface prism equation that meets the following conditions:

$\begin{array}{c}z(x,y)=\frac{C(x^2+y^2)}{1+\sqrt{1-(1+k)C^2(x^2+y^2)}}\\ +c_4{x}^2+c_6{y}^2\\ +c_8{x}^{2}y+c_{10}{y}^3\\ +c_{11}{x}^4+c_{13}{x}^2{y}^2+c_{15}{y}^4\\ +c_{17}{x}^{4}y+c_{19}{x}^2{y}^2+c_{21}{y}^5\\ +...\end{array}$

Wherein C is curvature of curved surface radius, c_jfor multinomial coefficient, during design, choose reasonable polynomial expression, is controlled to plane symmetry curved surface by free form surface.

Preferably, the Optical System Design in embodiment of the present utility model is following optical characteristics: the catercorner length of miniature image display 1 is 0.61 inch, and resolution is 800*600; Optical System Design diagonal field of view when imaging in infinite distance is 52 degree, emergent pupil distance is 22mm, and curved surface prism exit surface (in Fig. 2, face 3) is 22mm to the air line distance betweenemergent pupil 8, exit pupil diameter is 8mm, and the air line distance between miniscope 1 and curved surface prism is 5mm.By this scheme, visual field, the present embodiment Zhong center transfer function values is greater than 0.3 at 30lp/mm place, and visual field, edge is greater than 0.1, MTF curve as shown in accompanying drawing 3a at 30lp/mm place, and distortion curve is as shown in accompanying drawing 3b.

In the utility model embodiment, described Pixel-level depending on saturating rateadjustable display screen 7, can may occur for transparent monochromatic LCD display, transparent monochromatic OLED display screen etc. are existing or future any take pixel and control the display screen of screen display as unit.Described miniature image display 1 can be LCD display, can be also OLED display screen, LCoS(Liquid Crystal on Silicon, liquid crystal on silicon) the conventional miniature display screen such as display screen.

LCD display (Liquid Crystal Display, LCDs), this is liquid chemical substance liquid crystal, the same with the metal in magnetic field, and when being subject to external electrical field and affecting, its molecule can produce accurate ordered arrangement.If to the arrangement of molecule suitable control in addition, liquid crystal molecule can be controlled the transmissivity of light.In LCD display, the crystal drop of liquid crystal is all comprised in tiny cell structure, and one or more cells form a pixel on screen.When the electrode in LCD produces electric field, liquid crystal molecule will produce distortion, thereby the light passing through is wherein carried out to well-regulated refraction, realizes the control of the rate of looking.Because each pixel of LCD display can be controlled separately, so the utility model can adopt monochromatic transparent LCD to control to look rate, realize the control that Pixel-level is looked rate.And OLED display screen (Organic Light-Emitting Diode, Organic Electricity laser display) can be take pixel as unit, regulate the gray-scale value of each pixel, gray-scale value is larger, lower depending on saturating rate.

Referring to Fig. 4, be the structural representation of control system in the utility model embodiment head-wearing display device, described control system comprises memory module, control processor, display module circuit and peripheral circuit.Memory module is system storage, and control program and the data of whole HMD have been stored in the inside; Control processor is equivalent to computer CPU, and various data processing work all complete in this module; Display module circuit comprises graphic process unit, graphic process unit is by 2 video output interface output two-path video signals, one tunnel provides CGI image for miniature image display, and another road is that Pixel-level is provided for controlling the picture signal of the rate of looking depending on saturating rate adjustable display screen; Peripheral circuit comprises external communication interface, and for carrying out alternately with head-wearing display device, described external communication interface comprises one or more in Wi-Fi, bluetooth, GPS, GPRS, USB.

The utility model embodiment can be according to following one or more conditions regulating depending on saturating rate HMD:

1) the environment for use light intensity of HMD;

2) viewing area of computer generated image CGI;

3) in augmented reality AR technology, the region that needs emphasis to strengthen.

Realize with environmental light intensity and control the rate of looking, need to wear real device surface at the utility model embodiment the photosensitive device (light sensor) for perception environmental light intensity is installed, photosensitive device is submitted to control processor by intensity signal, after control processor is processed current intensity signal, send steering order to graphics controller, graphic process unit regulates depending on the whole region of the saturating rate adjustable display screen rate of looking Pixel-level according to intensity signal.In the utility model embodiment, in the control system of HMD, need the mapping relations that set in advance light intensity Yu look rate, mapping relations are that environmental light intensity is stronger, lower depending on saturating rate, occurrence does not limit at this, can set arbitrarily according to demand.As Fig. 6 a, for the utility model is implemented in surround lighting when weak, emphasize that joint looks the effect schematic diagram of rate, when surround lighting is weak, need to improve Pixel-level depending on the rate of looking of saturating rate adjustable display screen, to improve the CGI display effect of micro-aobvious screen; Fig. 6 b be the utility model embodiment when surround lighting is stronger, emphasize that joint looks the effect schematic diagram of rate, when surround lighting is stronger, can suitably reduce Pixel-level depending on the rate of looking of saturating rate adjustable display screen, to improve the CGI display effect of micro-aobvious screen.

Due in actual application, CGI image might not take whole display screen, sometimes CGI image can only occupy sub-fraction display screen, as Fig. 7 a, therefore, in order to improve display effect, need to reduce Pixel-level depending on the rate of looking of the viewing area that overlaps with CGI image on saturating rate adjustable display screen.Implementation is: graphic process unit is according to the region that is lit of the miniature image display detecting, regulate Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region, what show as Fig. 7 a be CGI image shared region on miniature image display, and what Fig. 7 b showed looks the schematic diagram of rate reduction for Pixel-level depending on corresponding region on saturating rate adjustable display screen.

In HMD application, the most worth the wait augmented reality AR technology, is about to virtual information and is added in real scene, under augmented reality application scenarios, is the outstanding shown information of augmented reality, the rate of looking in relative region can be reduced.Implementation is: graphic process unit presents area information according to the virtual information that extracts from application program on miniature image display, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.Referring to Fig. 8 a, what Fig. 8 a showed is the virtual information presenting on miniature image display, and what Fig. 8 b showed looks the schematic diagram of rate reduction for Pixel-level depending on virtual information corresponding region on saturating rate adjustable display screen.

Above-mentioned adjusting can separately be used depending on three kinds of methods of saturating rate, also can be combined with, and referring to Fig. 5, be above-mentioned three kinds of embodiment that method is combined with.HMD control system is after receiving the environmental light intensity signal that light sensor sends, judge whether environmental light intensity changes, if sending, environmental light intensity changes, according to the environmental light intensity of Installed System Memory storage and the corresponding relation depending on saturating rate, regulate Pixel-level depending on the rate of looking (as Fig. 6 a, 6b) of the whole screen area of saturating rate adjustable display screen, if unchanged, continue testing environment light intensity and whether change.After the regulating according to light intensity signal depending on saturating rate of whole screen, detect miniature image display and whether show CGI image, if, according to CGI region, the rate of looking (as Fig. 7 a, 7b) in Pixel-level depending on saturating rate adjustable display screen adjusted corresponding region, this is further to reduce the rate of looking at whole screen on depending on the basis of saturating rate depending on saturating rate.After the CGI rate of looking region regulates, detect in CGI image whether have augmented reality information, if having, regulate the rate of looking (as Fig. 8 a, 8b) in AR region, this is further to reduce the rate of looking in CGI region on depending on the basis of saturating rate depending on saturating rate.

Said method is described is self-adaptation and regulates and look rate method, and user can also pass through voice or gesture instruction, direct to the switch depending on saturating rate, depending on saturating ratio and region, manually control, to meet the needs of user under various environment.Implementation is: graphic process unit, according to modes such as user speech, gesture, touch instructions, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

The HMD of the utility model embodiment, adopts the free curved surface prism of three optical surfaces in conjunction with compensating prism on the one hand, makes the optical system exit pupil diameter of whole HMD large, distorts little; Adopted on the other hand a Pixel-level to control the rate of looking that regulates HMD depending on the display screen of saturating rate, can farthest meet the demand of user to aspects such as HMD comfort level, sharpness, reduce sense of fatigue when HMD is used, eyes being caused, improved greatly the availability of HMD.

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 narration especially all can be replaced by other equivalences or the alternative features with similar object.That is,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.

The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.

Claims (10)

1. a head-wearing display device HMD, comprise mirror holder, display system and control system, it is characterized in that, described display system comprises that miniature image display, curved surface prism, compensating prism and Pixel-level look rate adjustable display screen, described curved surface prism is the free curved surface prism with three optical surfaces, from observer's side, compensating prism is positioned at curved surface prism outside, and compensating prism and curved surface prism optical veneering; Pixel-level is positioned at compensating prism outside depending on saturating rate adjustable display screen; Miniature image display is for Display control computer synthetic image CGI image, and Pixel-level is injected the ratio of human eye for controlling extraneous scene light depending on saturating rate adjustable display screen;

The light that miniature image display sends first enters curved surface prism through the first surface transmission of curved surface prism, then in the inner side of second surface, there is total reflection, again through the 3rd surface reflection, finally through second surface, transmission enters human eye again, and the 3rd surface of described curved surface prism is coated with part reflective semitransparent film;

First extraneous scene light look the transmission of rate adjustable display screen through Pixel-level, then through the transmission of compensating prism second surface, enters compensating glass, and then the 3rd surface and the second surface through compensating prism first surface, curved surface prism enters human eye.

2. head-wearing display device HMD as claimed in claim 1, is characterized in that, the face type of the first surface of compensating prism and second surface respectively with the second surface of curved surface prism, the face type on the 3rd surface is identical.

3. head-wearing display device HMD as claimed in claim 2, is characterized in that, the face type of three optical surfaces of the curved surface prism equation that meets the following conditions:

$z(x,y)=\frac{C(x^2+y^2)}{1+\sqrt{1-(1+k)C^2(x^2+y^2)}}$

$+c_4{x}^2+c_6{y}^2$

$+c_8{x}^{2}y+c_{10}{y}^3$

$+c_{11}{x}^4+c_{13}{x}^2{y}^2+c_{15}{y}^4$

$+c_{17}{x}^{4}y+c_{19}{x}^2{y}^2+c_{21}{y}^5$

$+\·\·\·$

Wherein C is curvature of curved surface radius, c_jfor multinomial coefficient.

4. head-wearing display device HMD as claimed any one in claims 1 to 3, is characterized in that, described control system comprises memory module, control processor, display module circuit and peripheral circuit, wherein:

Display module circuit comprises graphic process unit, and graphic process unit output two-path video signal ，Yi road provides CGI image for miniature image display, and another road is that Pixel-level is provided for controlling the picture signal of the rate of looking depending on saturating rate adjustable display screen;

Peripheral circuit comprises external communication interface, and for carrying out alternately with head-wearing display device, described external communication interface comprises one or more in Wi-Fi, bluetooth, GPS, GPRS, USB.

5. head-wearing display device HMD as claimed in claim 4, it is characterized in that, described HMD also comprises the photosensitive device for perception environmental light intensity, photosensitive device sends to graphic process unit by intensity signal through control processor, graphic process unit regulates depending on the whole region of the saturating rate adjustable display screen rate of looking Pixel-level according to intensity signal, sets in advance light intensity and the mapping relations of looking rate in described control system.

6. head-wearing display device HMD as claimed in claim 4, is characterized in that, graphic process unit, according to the region that is lit of the miniature image display detecting, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

7. head-wearing display device HMD as claimed in claim 4, it is characterized in that, graphic process unit presents area information according to the virtual information that extracts from application program on miniature image display, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

8. head-wearing display device HMD as claimed in claim 4, is characterized in that, graphic process unit, according to one or more in user speech, gesture, touch instruction, regulates Pixel-level depending on the rate of looking of saturating rate adjustable display screen institute corresponding region.

9. head-wearing display device HMD as claimed any one in claims 1 to 3, is characterized in that, described Pixel-level is transparent monochromatic LCD display or transparent monochromatic OLED display screen depending on saturating rate adjustable display screen.

10. head-wearing display device HMD as claimed any one in claims 1 to 3, is characterized in that, described miniature image display is a kind of in LCD display, OLED display screen, LCoS display screen.

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