CN203773160U - Mini-type near-eye display optical system - Google Patents

Abstract

The utility model discloses a mini-type near-eye display optical system. The system comprises a liquid crystal on silicon (LCOS) image source; an LED light source; a first polarization beam splitter for reflecting S light of the LED light source to the LCOS image source and allowing P light sent by the LCOS image source to pass through; a second polarization beam splitter used for allowing the P light to pass through and reflecting the S light; a first 1/4 wavelength plate for receiving the P light passing through the second polarization beam splitter; a first reflector for reflecting the P light back so as to enable the P light to pass through the first 1/4 wavelength plate; a second 1/4 wavelength plate for receiving the S light passing through the first 1/4 wavelength plate for the second time and reflecting by the second polarization beam splitter; a second reflector for reflecting the S light back so as to enable the S light to pass through the second 1/4 wavelength plate; a coupling prism; and a waveguide device for receiving the P light output from the coupling prism. The mini-type near-eye display optical system provided by the utility model is compact in structure, and light and convenient, and has a large visual field and a wide application prospect.

Description

A kind of miniature nearly eye display optical system

Technical field

The utility model relates to the optical device field that shows use, is specifically related to a kind of miniature nearly eye display optical system.

Background technology

Near-eye display system is also referred to as Helmet Mounted Display, a kind ofly for virtual reality etc., to be presented at the visual displays having on user's head, be mainly used at first military affairs and scientific research field, along with scientific and technological progress and social development, people are more and more to the understanding of nearly eye display technique and study, and nearly eye display technique progressively enters people's life.Combined with virtual display technique and augmented reality, the application of nearly eye display technique expands to the aspects such as education, training, Commercial Exhibition, medical treatment, amusement.

Along with the development of display device, the size of imaging device and weight are also in continuous decline.Near-eye display system will be worn over head for a long time, and near-eye display system should be convenient to wear and carry.Therefore more and more outstanding for microminiaturization, portability and the high performance requirement of display device.

Application publication number is that CN102998799A(application number is 201210512881.6) Chinese invention patent application disclose Yu Shi border, a kind of empty border and merged near-eye display system, comprise video interface, nearly eye display device and in order to obtain the first outdoor scene capturing apparatus and concatenation module of the place ahead scene, the vision signal of inputting from described video interface after concatenation module is processed, produces the picture signal of inputting described nearly eye display device with the foreground signal being generated by described the first outdoor scene capturing apparatus.Described nearly eye display device comprises display member, in order to the driving circuit that drives described display member to show, the light that described display member is sent, transfers to the waveguide member of eyes side and the coupled apparatus that is optically coupled into waveguide member that described display member is sent.The LCOS display member of described display member for being formed by the micro-display screen of LCOS, pointolite, even tabula rasa and polarization beam apparatus; The light that described pointolite sends, after even tabula rasa is discrete, is projected to described polarization beam apparatus, by described polarization beam apparatus reflective polarizer, forms S light; Described S light is projected to the micro-display screen of LCOS, and part S light is transformed into the P light that carries image information through the micro-display screen of described LCOS, after the P light transmission polarization beam apparatus of the micro-display screen reflection of described LCOS, is projected to described coupled apparatus.Above-mentioned display member structure is still compact not, and its portability needs further to be improved.

Publication number is that CN1316063A(application number is 00801242.3) Chinese invention patent application a kind of head-mounted display is disclosed, be provided with image display and optical system, this optical system comprises semi-permeable mirror, lens element, polariscope and two λ/4 slice for beam combination, thereby the image that will form is incident upon on user's retina by image display, from image display, λ/4 slice, semi-permeable mirror, lens element, the 2nd λ/4 slice and polariscope are placed one by one.By this order of these optical elements, light can scioptics original paper three times, finally forms image.Although this technical scheme simplifies the structure, effectively saved cost, the structural compactness of this head-mounted display still needs further to be improved.

Utility model content

The utility model provides a kind of miniature near eye display optical system of large visual field of compactness.

A miniature nearly eye display optical system, comprising:

For the LCOS image source of image is provided;

Be used to described LCOS image source that the LED light source of light source is provided;

The first polarization beam apparatus passing through for the P light that the S light of described LED light source is reflexed in described LCOS image source and allow described LCOS image source launch;

The second polarization beam apparatus that passes through and S light is reflected for the P light that described the first polarization beam apparatus is passed through;

For receiving the one 1/4 wavelength plate of the P light that described the second polarization beam apparatus passes through;

For the P light that described the one 1/4 wavelength plate is received, be reflected back the first catoptron through described the one 1/4 wavelength plate;

For receive described the one 1/4 wavelength plate return through and the 2 1/4 wavelength plate of S light after described the second polarization beam apparatus reflection;

For the S light that described the 2 1/4 wavelength plate is received, be reflected back the second catoptron through described the 2 1/4 wavelength plate;

For receiving the couple prism that described the 2 1/4 wavelength plate penetrated and passed through the P light of described the second polarization beam apparatus;

For receiving from the P fiber waveguide device of described couple prism output.

In the utility model, the light that LED light source sends enters the first polarization beam apparatus (PBS1), on the polarization light-dividing surface of the first polarization beam apparatus (PBS1), S light is reflected, incide in LCOS image source, LCOS image source is illuminated, the light reflection of LCOS image source outgoing is to the polarization light-dividing surface of the first polarization beam apparatus (PBS1), because LCOS image source changes 90 degree by the polarization state of light, therefore, S light is become to P polarized light, be irradiated to light on the first polarization beam apparatus (PBS1) successively through the second polarization beam apparatus (PBS2) and the one 1/4 wavelength plate, incide on the first catoptron, after reflection, again pass through the one 1/4 wavelength plate, its polarization state is again rotated and is changed, by P light before, become S light, incide on the polarization light-dividing surface of the second polarization beam apparatus (PBS2), secondary reflection is by the 2 1/4 wavelength plate again, through the second catoptron reflection, return to the 2 1/4 wavelength plate, polarisation of light state becomes again P light, through the second polarization beam apparatus, by couple prism, be coupled in waveguide device, light is first propagated with total reflection form in waveguide device, arrive the semi-transparent semi-reflecting coupling output terminal of the waveguide sheet in waveguide device, after being reflected, a part sees through waveguide surface output, by human eye, received, part light wave sees through waveguide sheet to be continued to propagate.

As preferably, described the first polarization beam apparatus and the second polarization beam apparatus are linearly arranged, and the polarization light-dividing surface of the first described polarization beam apparatus is parallel with the polarization light-dividing surface of the second polarization beam apparatus, facilitate on the one hand the propagation of light signal, on the other hand, make the miniature nearly eye display optical system more compact structure of the utility model.

Polarization beam apparatus is polarization splitting prism, further preferably, the first described polarization beam apparatus comprises with coplanar the first right-angle prism being oppositely arranged in inclined-plane and the second right-angle prism, the second described right-angle prism is near described the second polarization beam apparatus, the inclined-plane of the first described right-angle prism and the intersection, inclined-plane of the second right-angle prism are provided with polarization light-dividing surface, can be coated with spectro-film by the intersection, inclined-plane at the first right-angle prism and the second right-angle prism and realize.Further preferred, described LCOS image source is positioned at the face place, right angle of first right-angle prism at the straight line place that described the first polarization beam apparatus and the second polarization beam apparatus linearly arrange, described LED light source is positioned at another face place, right angle of described the first right-angle prism, can realize passing through and reflecting of light path on the one hand, on the other hand, make structure very compact.

Further preferably, the second described polarization beam apparatus comprises with coplanar the 3rd right-angle prism being oppositely arranged in inclined-plane and the 4th right-angle prism, the 3rd described right-angle prism is near described the first polarization beam apparatus, the intersection, inclined-plane of the inclined-plane of described the 3rd right-angle prism and the 4th right-angle prism is provided with polarization light-dividing surface, by the intersection, inclined-plane at the 3rd right-angle prism and the 4th right-angle prism, is coated with spectro-film and realizes.Further preferred, the one 1/4 described wavelength plate and the first catoptron are positioned at the face place, right angle of the 4th right-angle prism at the straight line place that described the first polarization beam apparatus and the second polarization beam apparatus linearly arrange, the 2 1/4 described wavelength plate and the second catoptron are positioned at another face place, right angle of described the 4th right-angle prism, and the one 1/4 described wavelength plate is between described the first catoptron and the 4th right-angle prism, the 2 1/4 described wavelength plate is between described the second catoptron and the 4th right-angle prism, can realize passing through and reflecting of light path on the one hand, on the other hand, make structure very compact.

Again further preferably, the edged surface always of the 3rd described right-angle prism is near described the second right-angle prism, another face place, right angle of the 3rd described right-angle prism is connected to described couple prism, described couple prism is connected with described waveguide device, light is first propagated with total reflection form in waveguide device, arrives the semi-transparent semi-reflecting coupling output terminal of the waveguide sheet in waveguide device, sees through waveguide surface output after a part is reflected, by human eye, received, a part of light wave sees through waveguide sheet to be continued to propagate.

In the utility model, described waveguide device is comprised of the waveguide chip arrays of N semi-transparent semi-reflecting coupling output, between waveguide sheet, be parallel to each other, wherein, N=2-6, and N is integer.

Compared with prior art, the utlity model has following advantage:

The miniature nearly eye display optical system of the utility model, by simple optical element, and arrange through specific optical path, make the miniature nearly eye display optical system structure of the utility model very compact, simultaneously, the miniature nearly eye display optical system of the utility model has large visual field, the miniature nearly eye display optical system compact conformation and light of the utility model, therefore can be arranged on the near-eye display system of various structures or wear in display system, be conducive to the marketization and apply, have broad application prospects.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of miniature near-eye display system of the present utility model;

Fig. 2 is the light transmition schematic diagram of the miniature near-eye display system of the utility model embodiment;

Fig. 3 is the light transmition schematic diagram that the luminous half-angle of the utility model embodiment is θ;

Fig. 4 is the geometric relationship figure of the utility model embodiment the first catoptron reflection ray;

Fig. 5 is the geometric relationship figure of the utility model embodiment the second catoptron reflection ray;

Fig. 6 is the propagation schematic diagram of the utility model embodiment light in waveguide device;

Fig. 7 is that the miniature near-eye display system of the utility model embodiment is embedded into the side view in spectacle frame;

In figure, 1.LED light source, 2.LCOS image source, 3. the first polarization beam apparatus, 4. the second polarization beam apparatus, 5. the one 1/4 wavelength plate, 6. the first catoptron, 7. the 2 1/4 wavelength plate, 8. the second catoptron, 9. couple prism, 10. waveguide device, 11. human eyes.

Embodiment

Fig. 1 is a kind of miniature nearly eye display optical system structural representation of the present utility model.As shown in Figure 1, along optical propagation direction, miniature nearly eye display optical system comprises LED light source 1, the first polarization beam apparatus 3, LCOS image source 2, the second polarization beam apparatus the 4, the 1 wavelength plate 5, the first catoptron the 6, the 2 1/4 wavelength plate 7, the second catoptron 8, couple prism 9 and waveguide device 10 successively, finally, human eye 11 is for accepting the image light signals of the miniature nearly eye display optical system of the utility model.Particularly, LCOS image source 2 is for providing image, LED light source 1 is used to LCOS image source 2 that light source is provided, the first polarization beam apparatus 3 is for reflexing in LCOS image source 2 by the S light of LED light source 1 and allowing the P light of LCOS image source 2 transmittings pass through, the second polarization beam apparatus 4 for P light that the first polarization beam apparatus 3 is passed through by and S light is reflected, the P light that the one 1/4 wavelength plate 5 passes through for receiving the second polarization beam apparatus 4, the first catoptron 6 is reflected back through the one 1/4 wavelength plate 5 for the P light that the one 1/4 wavelength plate 5 is received, the 2 1/4 wavelength plate 7 for receive the one 1/4 wavelength plate return through and S light after the second polarization beam apparatus 4 reflection, the second catoptron 8 is reflected back through the 2 1/4 wavelength plate 7 for the S light that the 2 1/4 wavelength plate 7 is received, couple prism 9 penetrates and passes through the P light of the second polarization beam apparatus 4 for receiving the 2 1/4 wavelength plate 7, waveguide device 10 is for receiving from the P light of couple prism 9 outputs.

The first polarization beam apparatus 3 and the second polarization beam apparatus 4 are linearly arranged, and the polarization light-dividing surface of the first polarization beam apparatus 3 is parallel with the polarization light-dividing surface of the second polarization beam apparatus 4.The first polarization beam apparatus 3 comprises with coplanar the first right-angle prism being oppositely arranged in inclined-plane and the second right-angle prism, the second right-angle prism is near the second polarization beam apparatus 4, the intersection, inclined-plane of the inclined-plane of the first right-angle prism and the second right-angle prism is provided with polarization light-dividing surface, LCOS image source 2 is positioned at the face place, right angle of first right-angle prism at the straight line place that the first polarization beam apparatus 3 and the second polarization beam apparatus 4 linearly arrange, and LED light source 1 is positioned at another face place, right angle of the first right-angle prism.The second polarization beam apparatus 4 comprises with coplanar the 3rd right-angle prism being oppositely arranged in inclined-plane and the 4th right-angle prism, the 3rd right-angle prism is near the first polarization beam apparatus 3, the intersection, inclined-plane of the inclined-plane of the 3rd right-angle prism and the 4th right-angle prism is provided with polarization light-dividing surface, the one 1/4 wavelength plate 5 and the first catoptron 6 are positioned at the face place, right angle of the 4th right-angle prism at the straight line place that the first polarization beam apparatus 3 and the second polarization beam apparatus 4 linearly arrange, the 2 1/4 wavelength plate 7 and the second catoptron 8 are positioned at another face place, right angle of the 4th right-angle prism, and the one 1/4 wavelength plate 5 is between the first catoptron 6 and the 4th right-angle prism, the 2 1/4 wavelength plate 7 is between the second catoptron 8 and the 4th right-angle prism, the edged surface always of the 3rd right-angle prism is near the second right-angle prism, another face place, right angle of the 3rd right-angle prism is connected to couple prism 9, couple prism 9 is connected with waveguide device 10.Waveguide device 10 is comprised of the waveguide chip arrays of the semi-transparent semi-reflecting coupling output of N, between waveguide sheet, is parallel to each other, wherein, N=2-6, and N is integer, in the present embodiment, and concrete N=2.

The light that LED light source 1 sends enters the first polarization beam apparatus (PBS1) 3, on the polarization light-dividing surface of the first polarization beam apparatus (PBS1) 3, S light is reflected, incide in LCOS image source 2, LCOS image source 2 is illuminated, illuminate the rear light reflection of LCOS image source 2 to the polarization light-dividing surface of the first polarization beam apparatus (PBS1) 3, because LCOS image source 2 changes 90 degree by the polarization state of light, become P light, therefore be irradiated on the first polarization beam apparatus (PBS1) 3 successively through the second polarization beam apparatus (PBS2) 4 and the one 1/4 wavelength plate 5, polarisation of light state rotation 45 degree, after the first catoptron 6 reflections, again pass through the one 1/4 wavelength plate 5, its polarization state is rotated 45 degree again, by P light before, become S light, incide on the polarization light-dividing surface of the second polarization beam apparatus (PBS2) 4, reflection is by the 2 1/4 wavelength plate 7, through the second catoptron 8 reflections, return to the 2 1/4 wavelength plate 7, polarisation of light state becomes again P light, through the second polarization beam apparatus 4, in the couple prism 9 coupled into waveguide devices 10 that connect by waveguide device 10, light is propagated with the form of total reflection at waveguide device 10, arrive the semi-transparent semi-reflecting coupling output face of waveguide sheet, after the reflection of part light, through the output of waveguide sheet surface, enter human eye 11, part light continues to propagate, arrive next semi-transparent semi-reflecting.

Fig. 2 is the light transmition schematic diagram of the miniature nearly eye display optical system of the utility model embodiment.Fig. 3 is the light transmition schematic diagram that the luminous half-angle of the utility model embodiment is θ.LED light source 1 is area source, and for LCOS image source is thrown light on uniformly, LED array size is identical with the dimension scale of LCOS.The luminous half-angle of getting LED array is θ, in figure, light 12 is with θ outgoing, refraction enters in the first polarization beam apparatus 3 and propagates, be irradiated to afterwards LCOS image source 2, the light refraction that LCOS image source 2 is reflected back enters the first polarization beam apparatus 3 from A point, incide the B point reflection of the first catoptron 6, reflection ray incides the C point on the polarization light-dividing surface of the second polarization beam apparatus 4, reflected light propagates into the D point on the second catoptron 8, secondary reflection again, be coupled in fiber waveguide device 10, propagate into the E point of waveguide device 10, multiple reflections in optical waveguide, incide on semi-transparent semi-reflecting 14 of optical waveguide, after reflection, from waveguide sheet surface refraction, export, by human eye 11, received, as shown in light 13.

Take light 12 as example, and the light beam half-angle of LED is θ, and the refractive index of the first polarization beam apparatus 3 and the first polarization beam apparatus 4 is n, from the light of LED light source 1 outgoing, from air refraction, enters the first polarization beam apparatus 3, and refraction angle is θ ₁, according to refraction law

nsinθ ₁=sinθ

Therefore, ${\mathrm{\θ}}_1=\arcsin \frac{\sin \mathrm{\θ}}{n}.$

Light is irradiated on the polarization light-dividing surface of the first polarization beam apparatus 3 after the plane of incidence refraction of the first polarization beam apparatus 3, S light is reflected, during from the first polarization beam apparatus 3 outgoing, again reflect, propagate into afterwards in LCOS image source 2, image source is illuminated, and the polarization state reflecting changes, and enters in the first polarization beam apparatus 3 after refraction, as shown in Figure 3, refraction angle

${\mathrm{\θ}}_2={\mathrm{\θ}}_1=\arcsin \frac{\sin \mathrm{\θ}}{n}.$

Light is at two PBS(i.e. the first polarization beam apparatus 3 and the second polarization beam apparatus 4) and catoptron (i.e. the first catoptron 6 and the second catoptron 8) in propagation, be converted into geometric relationship, as shown in Figure 4.The length of getting the first polarization beam apparatus 3 and the second polarization beam apparatus 4 is L, and the thickness of the one 1/4 wavelength plate 5 and the 2 1/4 wavelength plate 7 is ignored, and the thickness of the first catoptron 6 is l ₁, radius is r ₁, the size of LCOS image source 2 is designated as P.Light enters the first polarization beam apparatus 3 and the second polarization beam apparatus 4 and propagates from the refraction of A point, see through successively the first polarization beam apparatus 3 and the second polarization beam apparatus 4 and the one 1/4 wavelength plate 5, finally be irradiated to the B point on the first catoptron 6, the angle of establishing incident ray and the first catoptron 6 normals is θ ₃.Be converted into geometrical issues, in figure, note L ₁=2L+l ₁, establish GF=x, AB=s, scos θ ₂=L ₁-x;

In triangle BOG, $r_1^2={(r_1-x)}^2+{[s\sin {\mathrm{\θ}}_2+(P/2)]}^2$

That is, 2s[r ₁cos θ ₂-L ₁cos θ ₂+ (P/2) sin θ ₂]+s ²=2r ₁l ₁-L ₁ ²-(P/2) ²

$s=\mathrm{AB}=\sqrt{2r_1{L}_1-{L_1}^2-{(P/2)}^2+{[\sin {\mathrm{\θ}}_{2}P/2+(r_1-L_1)\cos {\mathrm{\θ}}_2]}^2}-[{\sin \mathrm{\θ}}_2\×P/2+(r_1-L_1)\cos {\mathrm{\θ}}_2]$

$=\sqrt{2r_1{L}_1-{L_1}^2-{(P/2)}^2+{[\sin \mathrm{\θ}\×P/2n+(r_1-L_1)\sqrt{1-{(\sin \mathrm{\θ}/n)}^2}]}^2}-\sin \mathrm{\θ}\×P/2n+(L_1-r_1)\sqrt{1-{(\sin \mathrm{\θ}/n)}^2}$

In triangle AOB, according to the cosine law,

$\cos {\mathrm{\θ}}_3=\frac{s^2+r_1^2-[{(P/2)}^2+{(L_1-r_1)}^2]}{2s\×r_1}=\frac{s^2-{(P/2)}^2-L_1^2+2L_1{r}_1}{2s\×r_1}$

$=\frac{2s^2+2s[r_1\cos {\mathrm{\θ}}_2-L_1\cos {\mathrm{\θ}}_2+(P/2)\sin {\mathrm{\θ}}_2]}{2s\×r_1}$

$=\frac{1}{r_1}\sqrt{2r_1{L}_1-{L_1}^2-{(P/2)}^2+{[\sin {\mathrm{\θ}}_{2}P/2+(r_1-L_1)\cos {\mathrm{\θ}}_2]}^2}$

$=\frac{1}{r_1}\sqrt{2r_1{L}_1-{L_1}^2-{(P/2)}^2+{[\sin \mathrm{\θ}\×P/2n+(r_1-L_1)\sqrt{1-{(\sin \mathrm{\θ}/n)}^2}]}^2}$

${\mathrm{\θ}}_3=\arccos \frac{1}{r_1}\sqrt{2r_1{L}_1-{L_1}^2-{(P/2)}^2+{[\sin \mathrm{\θ}\×P/2n+(r_1-L_1)\sqrt{1-{(\sin \mathrm{\θ}/n)}^2}]}^2}$

The position B point of light on the first catoptron 6 can be determined, establishes the B o'clock distance to the second polarization beam apparatus 4 upper surfaces and is designated as h, to the distance in the second polarization beam apparatus 4 left sides, is designated as x, obtains

x=(L-P)/2-ssinθ ₂=(L-P)/2-ssinθ/n

$h=s\cos {\mathrm{\θ}}_2-2L=s\sqrt{1-{(\sin \mathrm{\θ}/n)}^2}-2L$

The light of B point reflection is through the one 1/4 wavelength plate 5, and polarization state changes again, incides on the polarization light-dividing surface of the one 1/4 wavelength plate 5, is designated as C point, and Fig. 5 is the geometric relationship figure of the utility model embodiment the second catoptron 8 reflection rays.

In triangle OBC,

∠B=θ ₄=θ ₂+2θ ₃

∠OCB=45°-∠B=45°-θ ₄

By sine $\frac{\mathrm{OC}}{\sin \∠B}=\frac{\mathrm{BO}}{\sin \∠\mathrm{OCB}}$

Solve $\mathrm{OC}=\frac{\sqrt{2}(h+x)}{\cot {\mathrm{\θ}}_4-1}$

Top and the limit, left side of C point distance the second polarization beam apparatus 4 are:

$c=\frac{\sqrt{2}}{2}(\sqrt{2}x+\mathrm{OC})=x+\frac{h+x}{\cot {\mathrm{\θ}}_4-1}$

$=(L-P)/2-s\sin \mathrm{\θ}/n+\frac{1}{n(\cot {\mathrm{\θ}}_4-1)}[s(\sqrt{n^2-{\sin }^2\mathrm{\θ}}-\sin \mathrm{\θ})-(L+P)/2]$

The axial line distance of C point distance the second catoptron 8 is

$c_1=\frac{L}{2}-c=P/2+s\sin \mathrm{\θ}/n-\frac{1}{n(\cot {\mathrm{\θ}}_4-1)}[s(\sqrt{n^2-{\sin }^2\mathrm{\θ}}-\sin \mathrm{\θ})-(L+P)/2]$

The horizontal range of distance the second catoptron 8 is

$c_2=L-c=(L+P)/2+s\sin \mathrm{\θ}/n-\frac{1}{n(\cot {\mathrm{\θ}}_4-1)}[s(\sqrt{n^2-{\sin }^2\mathrm{\θ}}-\sin \mathrm{\θ})-(L+P)/2]$

Represent that light is to be θ with the second catoptron 8 optical axises ₄angle incident, at the surface reflection of the second catoptron 8, the thickness of the second catoptron 8 is designated as l ₂.

Light is mapped on the D point of the second catoptron 8, and the distance that light is ordered to D from C point is:

$s_1=\mathrm{CD},L_2=c_2+l_2=L+l_2-x-\frac{h+x}{\cot {\mathrm{\θ}}_4-1}$

$s_1=\sqrt{2r_2{L}_2-{L_2}^2-{c_1}^2+{[(r_2-L_2)\cos {\mathrm{\θ}}_4-c_1\sin {\mathrm{\θ}}_4]}^2}-(r_2-L_2)\cos {\mathrm{\θ}}_4+c_1\sin {\mathrm{\θ}}_4$

In like manner the computation process of the first catoptron 6 is constructed triangle in the light path of the second catoptron 8, and the angle of establishing incident ray and the second catoptron 8 normals is θ ₅, according to the cosine law

$\cos {\mathrm{\θ}}_5=\frac{{s_1}^2+{r_2}^2-c_1^2-{(r_2-L_2)}^2}{2s_1{r}_2}=\frac{{s_1}^2-c_1^2+{2r}_2{L}_2-{L_2}^2}{2s_1{r}_2}$

$=\frac{s_1+(r_2-L_2)\cos {\mathrm{\θ}}_4-c_1\sin {\mathrm{\θ}}_4}{r_2}$

$=\frac{1}{r_2}\sqrt{2r_2{L}_2-{L_1}^2-{c_1}^2+{[(r_2-L_2)\cos {\mathrm{\θ}}_4-c_1\sin {\mathrm{\θ}}_4]}^2}$

Obtain, ${\mathrm{\θ}}_5=\arccos \frac{1}{r_2}\sqrt{2r_2{L}_2-{L_1}^2-{c_1}^2+{[(r_2-L_2)\cos {\mathrm{\θ}}_4-c_1\sin {\mathrm{\θ}}_4]}^2}$

Fig. 6 is the propagation schematic diagram of the utility model embodiment light in waveguide device 10.Light on the second catoptron 8 with θ ₅angle reflection, see through the second polarization beam apparatus 4, spread into waveguide device 10.The coupling angle of couple prism 9 is v, and the coupling angle of waveguide device 10 is u, and the semi-transparent semi-reflecting coupling output face of waveguide sheet and surperficial angle are w, and light wave incides on waveguide sheet with angle i.

i=u+v-(2θ ₅-θ ₄)

Light wave is coupled in waveguide sheet and propagates, in waveguide after total reflection several times, incide on semi-transparent semi-reflecting of first waveguide sheet, after the light reflection of half, from surperficial outgoing, the light of half continues to propagate through semi-transparent semi-reflecting, finally, from penetrating, enter human eye 11 waveguide surface refraction.

α=2w-i=2w-u-v+2θ ₅-θ ₄

nsinα=sinβ

β=arcsin(nsinα)=arcsin[nsin(2w-u-v+2θ ₅-θ ₄)]

In the utility model embodiment, field angle

FOV=2β=2arcsin[nsin(2w-u-v+2θ ₅-θ ₄)]

In above formula, θ ₅, θ ₄all with the size L of the first polarization beam apparatus 3 and the second polarization beam apparatus 4, the size P of LCOS image source 2, radius and the thickness of the first catoptron 6 and the second catoptron 8, the luminous half-angle of LED light source is relevant, so the field angle FOV of system is θ, P, L, r ₁, r ₂, l ₁, l ₂function,

FOV=f(θ,P,L,r ₁,r ₂,l ₁,l ₂)

Wherein, function f is provided by the computation process of top.Therefore, the size of the field angle of system and LCOS image source 2, the size of the first polarization beam apparatus 3 and the second polarization beam apparatus 4, radius and the thickness of the first catoptron 6 and the second catoptron 8, the luminous half-angle of LED light source 1 is relevant.

According to computing formula, establish: the length L=9mm of the first polarization beam apparatus 3 and the second polarization beam apparatus 4, the size P=6mm of LCOS image source 2, r ₁=r ₂=15mm, l ₁=l ₂=2mm, v=30 °, u=23 °, w=28 °, the luminous half-angle of LED light source 1 is θ=5 °, the field angle FOV of computing system.The partial parameters numerical value relating in computation process is as shown in table 1.

Opticator calculation of parameter value example when table 1LED light source 1 luminous half-angle is 5 °

θ 2	3.30889609377018°
		L 1(mm)	20
s(mm)	19.4546956648936°

θ 3	12.6448000236707°
		θ 4	28.5984961411116°
x(mm)	0.37709374132222
		h(mm)	1.4222620965698
c（mm）	2.53396295733334
		c 1（mm）	1.96603704266666
c 2（mm）	6.46603704266666
		L 2（mm）	8.46603704266666
s 1（mm）	9.39727651441846
		θ 5	18.8798738944984°
i	43.8387483521148°
		α	12.1612516478852°
β	18.5481951678244°
		FOV	37.09°

As can be seen from Table 1, when the luminous half-angle of LED light source 1 is 5 °, by given parameter, can be obtained 37 ° of the field angle FOV ≈ of optical system.Being about as 20mm of optical system PBS and mirror portion, wide is 11mm.When the thickness of optical system is 10mm, the utility model optical system is got 2.51g/cm except the weight of waveguide device and couple prism is about 6g(density of material ³).

Fig. 7 is the side view that the miniature near-eye display system of the utility model embodiment is embedded into the near-eye display system of spectacle frame.Near-eye display system 15 comprises spectacle frame 16, lens 20, optical presentation system 19 and be fixed to the drive electronics 21 on the leg of spectacles 17 of spectacle frame.In figure, 17 is a leg of spectacles, and 18 is second leg of spectacles, and leg of spectacles 18 can have the optical system of another glasses, also can not have.Leg of spectacles 17 and 18 can have common part.Spectacle frame 16 crutch glasses sheets 20, lens 20 is eyeglasses of any materials, has arbitrary refractive index, can have the function of myopia correction or long sight.Spectacle frame 16 also supports miniature near-eye display system 19, and the light of LCOS image source 2 reflections finally, by semi-transparent semi-reflecting coupling output of waveguide device medium wave guide card 22, enters human eye.Waveguide sheet 22, for coupling output terminal is semi-transparent semi-reflecting, can not block demonstration image.Power supply and data-interface 23 are by wire 24, or radio, and optical delivery etc. are connected to drive electronics 21.Power supply and data-interface 23 can be battery and miniature data connecting electronic equipment, are integrated in spectacle frame 16.Miniature near-eye display system of the present utility model is compact and light, therefore can be arranged on the near-eye display system of various structures, or wear in display system.

Claims (8)

1. a miniature nearly eye display optical system, is characterized in that, comprising:

For the LCOS image source of image is provided;

Be used to described LCOS image source that the LED light source of light source is provided;

The first polarization beam apparatus passing through for the P light that the S light of described LED light source is reflexed in described LCOS image source and allow described LCOS image source launch;

The second polarization beam apparatus that passes through and S light is reflected for the P light that described the first polarization beam apparatus is passed through;

For receiving the one 1/4 wavelength plate of the P light that described the second polarization beam apparatus passes through;

For the P light that described the one 1/4 wavelength plate is received, be reflected back the first catoptron through described the one 1/4 wavelength plate;

For receive described the one 1/4 wavelength plate return through and the 2 1/4 wavelength plate of S light after described the second polarization beam apparatus reflection;

For the S light that described the 2 1/4 wavelength plate is received, be reflected back the second catoptron through described the 2 1/4 wavelength plate;

For receiving the couple prism that described the 2 1/4 wavelength plate penetrated and passed through the P light of described the second polarization beam apparatus;

For receiving from the P fiber waveguide device of described couple prism output.

2. miniature near eye display optical system according to claim 1, it is characterized in that, described the first polarization beam apparatus and the second polarization beam apparatus are linearly arranged, and the polarization light-dividing surface of the first described polarization beam apparatus is parallel with the polarization light-dividing surface of the second polarization beam apparatus.

3. miniature near eye display optical system according to claim 2, it is characterized in that, the first described polarization beam apparatus comprises with coplanar the first right-angle prism being oppositely arranged in inclined-plane and the second right-angle prism, the second described right-angle prism is near described the second polarization beam apparatus, and the inclined-plane of the first described right-angle prism and the intersection, inclined-plane of the second right-angle prism are provided with polarization light-dividing surface.

4. miniature near eye display optical system according to claim 3, it is characterized in that, the face place, right angle of first right-angle prism at the straight line place that the first polarization beam apparatus described in described LCOS image source is positioned at and the second polarization beam apparatus are linearly arranged, described LED light source is positioned at another face place, right angle of described the first right-angle prism.

5. miniature near eye display optical system according to claim 3, it is characterized in that, the second described polarization beam apparatus comprises with coplanar the 3rd right-angle prism being oppositely arranged in inclined-plane and the 4th right-angle prism, the 3rd described right-angle prism is near described the first polarization beam apparatus, and the intersection, inclined-plane of the inclined-plane of the 3rd described right-angle prism and the 4th right-angle prism is provided with polarization light-dividing surface.

6. miniature near eye display optical system according to claim 5, it is characterized in that, the face place, right angle of the 4th right-angle prism at the straight line place that the first polarization beam apparatus described in the one 1/4 described wavelength plate and the first catoptron are positioned at and the second polarization beam apparatus are linearly arranged, the 2 1/4 described wavelength plate and the second catoptron are positioned at another face place, right angle of described the 4th right-angle prism, and the one 1/4 described wavelength plate is between described the first catoptron and the 4th right-angle prism, the 2 1/4 described wavelength plate is between described the second catoptron and the 4th right-angle prism.

7. miniature near eye display optical system according to claim 6, it is characterized in that, the edged surface always of the 3rd described right-angle prism is near described the second right-angle prism, another face place, right angle of the 3rd described right-angle prism is connected to described couple prism, and described couple prism is connected with described waveguide device.

8. miniature nearly eye display optical system according to claim 1, is characterized in that, described waveguide device is comprised of the waveguide chip arrays of N semi-transparent semi-reflecting coupling output, between waveguide sheet, be parallel to each other, wherein, N=2-6, and N is integer.