CN101144911A - Quasi-axial imaging optical projection display system - Google Patents

Abstract

The present invention provides a quasi-axially imaging optical projection displaying system of the projection displaying device of the large screen including back projection and front projection. The system includes a light source, an imaging device, an optical projection system formed by a first imaging light unit and a second imaging light unit, and a display screen. The present invention is characterized in that the focus of the image side of the first imaging light unit coincides with the focus of the object side of the second imaging light unit. The angle Theta between the imaging device and a main optical axis is more than 0 degree, and less than 45 degrees, and the axial magnification M and the magnification m perpendicular to the axis of the system satisfy the following relationship M=Cm<SUP>2</SUP>, in the formula the C is the proportion factor. The quasi-axially imaging optical system using the present invention can ensure the attenuation of the large-screen projection displaying device to be possible. The present invention can use a larger image generator to facilitate the selection of the light source, and can ensure the utilization to be increased obviously.

Description

The optical projection display system of quasi-axial imaging

Technical field

The present invention relates to a kind of optical projection display system of quasi-axial imaging of the large screen projection display device that is used to comprise rear-projection and preceding throwing.

Background technology

At present, in large screen television, projection TV is in screen size and all be better than comprising the direct viewing type TV of CRT, LCD and PDP etc. in price.The projection TV of current trend is pressed the kind branch of imager, and CRT, LCD, LCOS and DLP etc. are arranged.The optical axis with optical system is vertical basically with display screen for the imager of these projection TVs, is subjected to restrictions such as light source in the optical system, imager, optical element and light path design, and the complete machine size is thicker.In the analysis that further above-mentioned factors is influenced the complete machine size, the mutual configuration of finding each ingredient of formation projection display equipment is the selection that is subjected to the relative position and the optical element of imager, display screen and primary optical axis, and light path trend is extremely important influence factor, and the application draws up this and makes improvement.

Summary of the invention

The object of the present invention is to provide a kind of optical projection display system of quasi-axial imaging of the large screen projection display device that is used to comprise rear-projection and preceding throwing.

The objective of the invention is to be realized by following technical proposals: the optical projection display system according to quasi-axial imaging of the present invention comprises a light source, an imager, an optical projection system that constitutes by the first imaging group and the second imaging group, and a display screen composition, it is characterized in that disposing to relation by fiducial axis between said imager and the primary optical axis; The picture side of the imager of the said first imaging group between imager and display screen, the object space of the display screen of the said second imaging group between imager and display screen, the front focus of the back focus of the first imaging group and the second imaging group overlaps on optical axis, and total logitudinal magnification M of optical projection system and total vertical logitudinal magnification m should satisfy:

M＝Cm ²，

Wherein:

$C=\frac{\sqrt{1+\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">m</figure-callout>}}^2}{\mathrm{<figure-callout\; id="2"\; label="tan"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">tan</figure-callout>}}^2\mathrm{\&theta;}}}{\sqrt{1+{\mathrm{<figure-callout\; id="2"\; label="tan"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">tan</figure-callout>}}^2\mathrm{\&theta;}}},$

Be as the criterion in the axial imaging system axial magnification of C is the angle of imager and primary optical axis with scale factor θ between a magnification that hangs down spool, 0 °＜θ＜45 °.

The applicant is in this mandatory declaration, term used in the present invention " quasi-axial imaging " is for axial imaging, be meant the imaging system that imager and primary optical axis have angle, said angle must be greater than zero but is no more than 45 °, so that distinguish with existing vertical projection or axis projection system or device.The said term of the present invention " imaging group " comprises by lens, catoptron and optical system that combination constituted thereof.

For ease of understanding the present invention, at first introduce the ultimate principle that Fig. 1 illustrates axial imaging, as shown in the figure, the optical axis of light group L is Z, focal length is f, and thing is a line segment of placing along optical axis, and AB is an infinitesimal on this line segment, wherein, the coordinate of A is u, the coordinate of B is-(u+du); The length of AB is du.A ' B ' be infinitesimal AB through the picture of light group L on optical axis, wherein, the coordinate of A ' is u ', the coordinate of B ' is u '+du ', the size of the picture A ' B ' of infinitesimal AB is du '.We define thing and picture all the magnification when placing perpendicular to optical axis be vertical logitudinal magnification m; Magnification when thing and picture all lie on the optical axis is logitudinal magnification M.According to imaging formula:

$-\frac{1}{u}+\frac{1}{u\&prime;}=\frac{1}{f}---\left(1\right)$

Can get

$u\&prime;=\frac{\mathrm{uf}}{u+f},---\left(2\right)$

Vertical logitudinal magnification

$m=\frac{u\&prime;}{u}=\frac{f}{u+f},---\left(3\right)$

Logitudinal magnification

$M=\frac{\mathrm{du}\&prime;}{\mathrm{du}}=\frac{1}{{(u+f)}^2}[f(u+f)-\mathrm{uf}]=\frac{f^2}{{(u+f)}^2}.---\left(4\right)$

Relatively (3) formula and (4) formula as can be known, logitudinal magnification be hang down logitudinal magnification square, promptly

M＝m ² (5)

Find out that by (3), (4) formula m and M are the functions of u, promptly the magnification of each pixel is to change with its position u on optical axis.

Axially the optical projection display system of imaging must make the magnification of each pixel not change with u, and its principle as shown in Figure 2.

In Fig. 2, the first imaging group L ₁With the second imaging group L ₂Be that focal length is respectively f ₁And f ₂The imaging group.The first imaging group L ₁Vertical logitudinal magnification be m ₁, the second imaging group L ₂Vertical logitudinal magnification be m ₂As the first imaging group L ₁The rear focus and the second imaging group L ₂Focus in object space when coinciding with F, the vertical logitudinal magnification m=m of this system ₁* m ₂Derive and can draw by simple mathematical:

$\begin{array}{cc}m=-\frac{f_2}{f_1}& M=m^2={\left(\frac{f_2}{f_1}\right)}^2\end{array}---\left(6\right)$

Therefore, throw in the imaging system at axle, hang down logitudinal magnification m and logitudinal magnification M are the constants that does not change with u, have realized the even amplification of axial imaging.

The analysis of front all is based on object plane and optical axis coincidence, but in fact in order to make thing obtain more light sources irradiation, object plane and optical axis is placed at angle, as shown in Figure 3.In Fig. 3, Z is an optical axis, and du is an infinitesimal on the thing, and du ' is the last infinitesimal corresponding with du of picture.The angle of thing and Z axle is θ, is θ ' as the angle with the Z axle.According to image-forming principle, fiducial axis is thrown the magnification of imaging system

M’＝du’/du。(7)

Will $\mathrm{du}=\sqrt{d{x}^2+d{z}^2},$ $\mathrm{du}\&prime;=\sqrt{{\mathrm{dx}\&prime;}^2+d{z\&prime;}^2},$ dx＝dztanθ，dx’＝dz’tanθ’，

X '=mdx, dz '=Mdz substitution (7) formula gets:

$M\&prime;=\frac{\mathrm{du}\&prime;}{\mathrm{du}}=\frac{\sqrt{m^{2}d{x}^2+M^{2}d{z}^2}}{\sqrt{d{x}^2+d{z}^2}}.---\left(8\right)$

Get mtan θ=M tan θ ' by mdx=Mdztan θ ', so (8) formula can be written as again:

$M\&prime;=\left[\frac{\sqrt{1+\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">m</figure-callout>}}^2}{\mathrm{<figure-callout\; id="2"\; label="tan"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">tan</figure-callout>}}^2\mathrm{\&theta;}}}{\sqrt{1+{\tan }^2\mathrm{\&theta;}}}\right]{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">m</figure-callout>}}^2=\mathrm{<figure-callout\; id="2"\; label="C\; m"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">C</figure-callout>}{m}^{}{}^2,---\left(9\right)$

(9) C in the formula be the fiducial axis logitudinal magnification of throwing imaging system with a magnification that hangs down spool between scale factor

$C=\frac{\sqrt{1+\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">m</figure-callout>}}^2}{\mathrm{<figure-callout\; id="2"\; label="tan"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">tan</figure-callout>}}^2\mathrm{\&theta;}}}{\sqrt{1+{\mathrm{<figure-callout\; id="2"\; label="tan"\; filenames="A20061012718400201.png"\; state="\{\{state\}\}">tan</figure-callout>}}^2\mathrm{\&theta;}}}.$

According to the optical projection display system of quasi-axial imaging of the present invention compared with the prior art, change prior art and imager and display screen must have been placed traditional mode with the perpendicular position of optical axis, thereby reduced the thickness of whole rear-projection TV.Secondly, according to its logitudinal magnification of optical projection display system M of axial imaging of the present invention be hang down logitudinal magnification m square doubly, therefore, under the identical condition of projection picture size, the used imager size of the present invention imager size more used than existing rear-projection TV is big, thereby has reduced imager PEL (picture element) density, resolution, the irradiation of anti-high light the and high temperature resistant etc. requirement.The 3rd, have simple in structurely according to the optical projection display system of axial imaging of the present invention, be easy to make the advantage that cost is low.

Description of drawings

Above-mentioned purpose of the present invention and other purpose and advantage thereof will further be understood the present invention by the detailed description below in conjunction with the accompanying drawing illustrated embodiment.Accompanying drawing has:

Fig. 1, basic optical imaging system;

Fig. 2, axle are thrown the imaging system schematic diagram;

Fig. 3, fiducial axis of the present invention are thrown the imaging system schematic diagram;

Fig. 4, throw the system construction drawing of the optical projection display system embodiment of imaging according to fiducial axis of the present invention;

The system construction drawing of Fig. 5, another embodiment of the present invention.

Embodiment

At first with reference to figure 4, shown is according to fiducial axis of the present invention first embodiment to the optical projection display system of projection, shown in figure (6), the turnkey of setting up departments is drawn together a light source 1, this light source can be a high-pressure sodium lamp, also can be other light source that is fit to native system, as LED.A Fresnel Lenses 2 that plays the condenser effect, light source 1 place on the focus in object space of your lens 2 of luxuriant and rich with fragrance Nirvana.The light that light source 1 sends is through 2 one-tenth directional light irradiations of lens thing 3, and according to present embodiment, this lens shape is of a size of 200 * 180mm, and focal length is 130mm.The optical interval of the luxuriant and rich with fragrance Nirvana that lens 2 and the first imaging group 4 is 260mm.In the present embodiment, thing 3 is a chromium plate, it is of a size of 166 millimeters X13.375 millimeters, about 29.21 ° of its plane and optical axis included angle, if after pixel is exaggerated be a square, then the horizontal vertical ratio of pixel is 8 to 1.1457, in this example, pixel is 0.1 millimeter of 0.8 millimeter ratio, and thing 3 places outside the place ahead focus of the first imaging group 4.The first imaging group 4 is made up of 7 eyeglasses, and wherein the structure of each sheet eyeglass from following listed optical system parameter as can be known.First plane mirror 5, its plane and optical axis included angle are 45 °, and second plane mirror 6, its plane and optical axis included angle are 45 °, and the effect of first plane mirror 5 and second plane mirror 6 is that light path is turned back, to reduce overall dimensions.According to present embodiment, the second imaging group 7 is a spherical reflector 8, about 2468 millimeters of radius, about 5 ° with optical axis included angle, the center of curvature of spherical reflector 8 overlaps with the rear focus of the first imaging group 4, and the imaging surface of the second imaging group 8 is the display screen 9 on plane.Wherein the culminating point of the first imaging group, 4 last one sides and the second imaging group, 8 culminating points are at a distance of about 1296 millimeters.Concrete parameter is as follows:

ZEMAX software optic system for outputting face type data.

URFACE?DATA?SUMMARY：

Surf Type Radius Thickness Glass Diameter Conic

OBJTIL TSURF - 84.00205 126.0992

1 STANDARD Infinity 0 air 67.077 0

2 EVENASPH -131.4671 26 ZF2 95 0

3 EVENASPH -301.552 1.7 air 95 0

4 EVENASPH 62.54333 14 K9 89 0

5 EVENASPH 126.3622 1 air 89 0

6 EVENASPH 66.44446 20 ZK11 82 0

7 STANDARD 134.84 8 ZF7 82 0

8 EVENASPH 78.3394 11.6 air 25.37258 0

STO STANDARD Infinity 3 air 16.54242 0

10 EVENASPH -332.2905 35 F2 20.20198 0

11 STANDARD 255.7889 14 ZK11 75 0

12 EVENASPH -70.01809 15.75 air 75 0

13 EVENASPH -68.20695 41 ZF2 80 0

14 EVENASPH -110.4211 1296.3 air 120 0

15 COORDBRK - 0 - -

16 STANDARD -2468.2 -464.8879 MIRROR 1097.498 0

17 COORDBRK - -30 - - -

18 COORDBRK - 0 - - -

IMA STANDARD Infinity 1219.229

SURFACE?DATA?DETAIL：

Surface?OBJ：TILTSURF

X?Tangent：0

Y?Tangent：-1.7884305

Aperture：Rectangular

Aperture

X?Half?Width：63.04958

Y?Half?Width：3

Surface?1：STANDARD

Surface?2：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：9.9825239e-007

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture：Floating?Aperture

Maximum?Radius：47.5

Surface?3：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：-3.2521437e-008

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture：Floating?Aperture

Maximum?Radius：47.5

Surface?4：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：-2.8063217e-006

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture：Floating?Aperture

Maximum?Radius：44.5

Surface?5：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：7.7527921e-007

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture：Floating?Aperture

Maximum?Radius：44.5

Surface?6：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：2.4563298e-006

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture：Floating?Apertu?re

Maximum?Radius：41

Surface?7：STANDARD

Aperture：Floating?Aperture

Maximum?Radius：41

Surface?8：EVENASPH

Coeff?on?r?2：0

Coeff?on?r?4：2.1732482e-006

Coeff?on?r?6：0

Coeff?on?r?8：0

Coeff?on?r?10：0

Maximum?Radius：40

Surface?14：

EVENASPH

Coeff?on?r?2：

0

Coeff?on?r?4：2.2325381e-007

Coeff?on?r?6：

0

Coeff?on?r?8：

0

Coeff?on?r?10：0

Coeff?on?r?12：0

Coeff?on?r?14：0

Coeff?on?r?16：0

Aperture?：Floating

Aperture

Maximum?Radius：60

Surface?15：

COORDBRK

Decenter?X：

0

Decenter?Y：

3

TiltAbout?X：-2.5

Tilt?About?Y：

0

Tilt?About?Z：

0

Order：Decenter?then

tilt

Surface?16：

STANDARD

Aperture：Rectangular

Aperture

X?Half?Width：550

Y?Half?Width：40

Surface?17：

COORDBRK

Decenter?X：

0

Decenter?Y：

-3

Tilt?About?X：

2.5

Tilt?About?Y：

0

Tilt?About?Z：

0

Order：Decenter?then

tilt

Surface?18：COORDBRK

Decenter?X：

0

Decenter?Y：

-20

Tilt?About?X：89.02913

Tilt?About?Y：

0

Tilt?About?Z：

0

Order：Decenter?then

tilt

Surface?IMA：

STANDARD

Aperture：Rectangular

Aperture

X?Half?Width：530

Y?Half?Width：370

According to another embodiment of the present invention, as shown in the figure, light source 11 is made up of led array with reference to figure 5 explanation, and every group of LED forms (not shown) by RGB (red, green, blue) three LEDs, and every group of spacing is 20mm, has 2 * 5 and is 10 groups.Every group has a focal length to be about 20 lens combination 12, and its bore is 20*20mm.Thing 13 is color films, and display pixel is a square, and the horizontal vertical ratio of the pixel on the film is 3.61: 1.05,, with optical axis included angle be 18 the degree about.The first imaging group is a non-spherical reflector 14, and radius is about 1928.825 millimeters to 1300.001 millimeters, and its focal plane is vertical with systematic optical axis; 15 and 16 is respectively plane mirror, they turn back light path, to reduce the size of system, in the present embodiment, plane reflection thing 15 is the cholesteric liquid crystal sheet that the centre wavelength of three reflection kernel wavelength and used three-color LED is complementary, the optical axis included angle of reflecting surface and system is about 86 degree, apart from non-spherical reflector 14 about 660 millimeters, plane mirror 16 is the plane mirrors with high reflectance, its reflectivity is not less than 75%, anomaly face catoptron 15 about 650 millimeters, the second imaging group 17 also is a non-spherical reflector, and radius is about 4696.264 millimeters to 4698.281 millimeters; Second focus of the first imaging group 14 overlaps substantially with first focus of the second imaging group 17.The 18th, screen, the angle of screen and optical axis are about 4.6 °.Concrete parameter is as follows:

ZEMAX software optic system for outputting face type data.

URFACE?DATA?SUMMARY：

Surf Type Radius Thickness Glass Diameter Conic

OBJ TILTSURF - -742.7317 117.7455

1 COORDBRK - 0 - -

STO TOROIDAL 1298.825 0 MIRROR 216.08664 0

3 COORDBRK - 660 - -

4 COORDBRK - 0 - -

5 STANDARD Infinity 0 MIRROR 81.31919 0

6 COORDBRK - - 650 - -

7 COORDBRK - 0 - -

8 STANDARD Infinity 0 MIRROR 196.5455 0

9 COORDBRK - 1702.304 - -

10 COORDBRK - 0 - -

11 TOROIDAL -4696.264 0 MIRROR 497.6951 0

12 COORDBRK - 0 - -

13 COORDBRK - 0 - -

IMA TOROIDAL Infinity BK7 4196.618

SURFACE?DATA?DETAIL：

Surface?OBJ：TILTSURF

X?Tangent：0

Y?Tangent：3.4335624

Aperture：Rectangular?Aperture

X?Half?Width：55.35

Y?Half?Width：21

Surface?1：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：0

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?STO：TOROIDAL

Rad?of?rev.1300.001

Coeff?on?y^2：0

Coeff?on?y^4：0

Coeff?on?y^6：0

Coeff?on?y^8：0

Coeff?on?y^10：0

Coeff?on?y^12：0

Coeff?on?y^14：0

Aperture：Rectangular?Aperture

X?Half?Width：90

Y?Half?Width：90

Surface?3：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：0

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?4：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：-4

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?5：STANDARD

Aperture：Floating?Aperture

Maximum?Radius：40.6596

Surface?6：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：-4

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?7：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：4

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?8：STANDARD

Aperture：Floating?Aperture

Maximum?Radius：98.27274

Surface9：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：4

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?10：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：-2.3245653

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?til?t

Surface?11：TOROIDAL

Rad?of?rev.-4698.2813

Coeff?on?y^2：0

Coeff?on?y^4：0

Coeff?on?y^6：0

Coeff?on?y^8：0

Coeff?on?y^10：0

Coeff?on?y^12：0

Coeff?on?y^14：0

Aperture：Rectangular?Aperture

X?Half?Width：250

Y?Half?Width：120

Surface?12：COORDBRK

Decenter?X：0

Decenter?Y：0

Tilt?About?X：2.3245653

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?13：COORDBRK

Decenter?X：0

Decenter?Y：-90

Tilt?About?X：89.952927

Tilt?About?Y：0

Tilt?About?Z：0

Order：Decenter?then?tilt

Surface?IMA：TOROIDAL

Rad?of?rev.14706.845

Coeff?cn?y^2：0

Coeff?on?y^4：0

Coeff?on?y^6：0

Coeff?on?y^8：0

Coeff?on?y^10：0

Coeff?on?y^12：0

Coeff?on?y^14：0

Aperture：Floating?Aperture

Maximum?Radius：2098.309

The applicant has made detailed description with design of the present invention and embodiment; the professional and technical personnel can make various conversion and improvement on basis of the present invention; but these conversion and improvement all do not break away from spirit of the present invention, all within the protection domain that claims limited.

Claims (9)

1. the optical projection display system of a quasi-axial imaging, comprise a light source, an imager, an optical projection system that constitutes by the first imaging group and the second imaging group, and a display screen composition, it is characterized in that disposing to relation by fiducial axis between said imager and the primary optical axis; The picture side of the imager of the said first imaging group between imager and display screen, the object space of the display screen of the said second imaging group between imager and display screen, the front focus of the back focus of the first imaging group and the second imaging group overlaps on optical axis, and total logitudinal magnification M of optical projection system and total vertical logitudinal magnification m should satisfy:

M＝Cm ²，

Wherein

$C=\frac{\sqrt{1+\frac{1}{m^2}{\tan }^2\mathrm{\&theta;}}}{\sqrt{1+{\tan }^2\mathrm{\&theta;}}}.$

The C scale factor between axial magnification and a magnification that hangs down spool that is as the criterion in the axial imaging system, θ is the angle of imager and primary optical axis, 0 °＜θ＜45 °.

2. according to the optical projection display system of the described quasi-axial imaging of claim 1, it is characterized in that described light source is high-pressure sodium lamp or LED or semiconductor laser.

3. according to the optical projection display system of the described quasi-axial imaging of claim 2, it is characterized in that described LED or semiconductor laser are to become configuration set with red, green, blue three looks.

4. according to the optical projection display system of the described quasi-axial imaging of claim 1, it is characterized in that described optical projection system is constituted by lens, catoptron or its.

5. according to the optical projection display system of the described quasi-axial imaging of claim 4, the first imaging group that it is characterized in that described optical projection system is a lens combination, the second imaging group is a spherical reflector, and a pair of catoptron that becomes certain orthogonal configuration with optical axis is arranged therebetween.

6. according to the optical projection display system of the described quasi-axial imaging of claim 5, it is characterized in that the described first imaging group is made up of seven lens, the second imaging group is a spherical reflector, the parameter of each sheet lens and spherical reflector is as follows:

ZEMAX software optic system for outputting face type data are:

URFACE?DATA?SUMMARY：

Surf Type Radius Thickness Glass Diameter Conic

OBJ TILTSURF - 84.00205 126.0992

1 STANDARD Infinity 0 air 67.077 0

2 EVENASPH -131.4671 26 ZF2 95 0

3 EVENASPH -301.552 1.7 air 95 0

4 EVENASPH 62.54333 14 K9 89 0

5 EVENASPH 126.3622 1 air 89 0

6 EVENASPH 66.44446 20 ZK11 82 0

7 STANDARD 134.84 8 ZF7 82 0

8 EVENASPH 78.3394 11.6 air 25.37258 0

STO STANDARD Infinity 3 air 16.54242 0

10 EVENASPH -332.2905 35 F2 20.20198 0

11 STANDARD 255.7889 14 ZK11 75 0

12 EVENASPH -70.01809 15.75 air 75 0

13 EVENASPH -68.20695 41 ZF2 80 0

14 EVENASPH -110.4211 1296.3 air 120 0

15 COORDBRK - 0 - -

16 STANDARD -2468.2 -464.8879 MIRROR 1097.498 0

17 COORDBRK - -30 - - -

18 COORDBRK - 0 - - -

IMA STANDARD Infinity 1219.229

7. according to the optical projection display system of the described quasi-axial imaging of claim 4, it is characterized in that the described first imaging group and the second imaging group are non-spherical reflector, have a pair of catoptron therebetween.

8. according to the optical projection display system of the described quasi-axial imaging of claim 7, it is characterized in that the parameter of the described first imaging group and the second imaging group is as follows:

ZEMAX software optic system for outputting face type data are:

URFACE?DATA?SUMMARY：

Surf Type Radius Thickness GIass Diameter Conic

OBJ TILTSURF - -742.7317 117.7455

1 COORDBRK - 0 - -

STO TOROIDAL 1298.825 0 MIRROR 216.8664 0

3 COORDBRK - 660 - -

4 COORDBRK - 0 - -

5 STANDARD Infinity 0 MIRROR 81.31919 0

6 COORDBRK - -650 - -

7 COORDBRK - 0 - -

8 STANDARD Infinity 0 MIRROR 196.5455 0

9 COORDBRK - 1702.304 - -

10 COORDBRK - 0 - -

11 TOROIDAL -4696.264 0 MIRROR 497.6951 0

12 COORDBRK - 0 - -

13 COORDBRK - 0 - -

IMA TOROIDAL Infinity BK7 4196.618

9. according to the optical projection monitor system of the described quasi-axial imaging of claim 8, it is characterized in that first plane mirror in the described a pair of catoptron is the cholesteric liquid crystal sheet that the centre wavelength of three reflection kernel wavelength and used three-color LED is complementary, the optical axis included angle of reflecting surface and system is about 86 degree.

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