CN101149483A - Digital optical processing projection display device color-separation color-combination optical system - Google Patents
Digital optical processing projection display device color-separation color-combination optical system Download PDFInfo
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- CN101149483A CN101149483A CNA2006100172075A CN200610017207A CN101149483A CN 101149483 A CN101149483 A CN 101149483A CN A2006100172075 A CNA2006100172075 A CN A2006100172075A CN 200610017207 A CN200610017207 A CN 200610017207A CN 101149483 A CN101149483 A CN 101149483A
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Abstract
This invention is in the field of digital optical processing projector scope technology, especially relating to a color separation and combination structure system. It includes: three DMD devices (R, G, B) to modulate the red, green and blue tricolor light, a X-prism (P1) to separate and combine color, a red color filter (P2), a blue color filter (P3) and two pieces of Al reflectors (M1 and M2). The angle between incident illuminating ray and modulated dark ray is 180 degree. The angle between bright ray and incident ray is four times as microscope running angle in the DMD device. The X-prism is combined with each color filter, to realize separation and combination these two structures. Two Al reflectors are used to fold optical path. This invention only uses one X-prism, two filters and two reflectors, so it can lighten the weight of system, and reduce the cost; it also increases the separate extent between image light path and illuminating light path and avoids the mixed ray shining into projection light path, so it can increase the contrast of system.
Description
Technical field:
The invention belongs to digital light and handle (Digital Light Processing is hereinafter to be referred as DLP) projection display technique field, particularly relate to a kind of color-separation and color-recombination optics system architecture.
Background technology:
The DLP projection display technique has obtained very fast development in recent years, has all obtained using widely in various front projection display system and investigation of projection display system, and the market share of being occupied constantly enlarges.Than liquid crystal display (LCD) and liquid crystal on silicon (LCoS) projection display system, the advantage of DLP projector is the picture exquisiteness, the contrast height, and system architecture is simple, and optical property is stable.The DLP projection display system uses Digital Micromirror Device (Digital Micromirror Device is hereinafter to be referred as DMD) as display unit.DMD be on CMOS SRAM storer based on common chip manufacture, use the moulding of retrofit technology.Interval with 17 μ m on semi-conductor chip forms a hundreds of thousands 16*16 μ m
2Aluminium film mirror.On the thin torsion hinge that the diagonal axis direction forms, suspending micro mirror in midair, because the acting between the landing position of electrostatic force between framework and the storage unit rotated.The rotation angle of micro mirror is subjected to the accurate control of pixel geometry three-dimensional structure, and is the center rotation with the diagonal axis, be inclined to ± 10 °, thereby obtain electromechanical steady state (SS) and can be between this two states speed-sensitive switch.
The color separating and combining system structure of three-chip type DLP projection display system as shown in Figure 1, by the total reflection prism that changes the light path effect (being formed by a and b prism gummed), color separation is formed with the Philips prism system that closes the look effect (being formed by c, d and e prism gummed) and the DMD of three modulated monochromatic light bundles.
Summary of the invention:
Big at color separating and combining system weight in the prior art, the cemented surface of light process is many, and the shortcoming that back focal length is long the purpose of this invention is to provide a kind of raising system contrast, reduces the color separating and combining system of system weight and complexity.
For realizing described purpose, comprise among the present invention: a color-separation and color-recombination prism, two dichroism color filters, two aluminium reflectors, three dmd chips, color-separation and color-recombination prism, red color filter, blue color filter and two aluminium reflectors make up respectively, realize two kinds of color-separation and color-recombination structures of A, B.
Its micromirror rotational angle is ± 10 °.Mainly based on the principle of work of DMD, Fig. 2 is the optical modulation synoptic diagram of DMD: wherein Y is the position on chip plane, the vertical paper of the rotation axis of micromirror in the present invention; A and A ' are respectively micromirror and rotate ± 10 ° position; L and L ' are respectively the normals of A and A ', and intersection point is o.When powering up for a termination electrode, make micromirror be in the A position, when light a became 10 ° of incidents with L, its reflection ray b vertical chip plane Y shone on the screen, and this is bright attitude; When powering up for other end electrode, when making micromirror be in A ' position, reflection ray is b ', becomes 40 ° with the chip plane normal, and projection is less than on the screen, and this is dark attitude.The design allows the normal L incident (as Fig. 3) of the parallel A of incident ray a, and then when micromirror is in A ' position, because of 20 ° of light a and L ' angles, 40 ° of reflection ray b and incident ray a angles allow light b project on the screen, are bright attitude; When micromirror was in the A position, light a was reflected back along former direction, can not project on the screen, and this is dark attitude.
The present invention allows illuminating bundle earlier by a color-separation and color-recombination prism, will be broken down into three kinds of primary lights of RGB and shine respectively on each self-corresponding DMD, and this is the beam split function; Green glow after the modulation directly throws to screen, and the ruddiness after the modulation is synthesized to green glow through a red color filter, and the blue light after the modulation is synthesized to red-green glow through a blue color filter, and this is for closing the light function; Three coloured light that will be synthesized together at last project on the screen.
Because the present invention allows 80 ° of incidents of illuminating bundle and chip plane included angle, secretly the attitude light beam returns along former road, and the angle of bright attitude light and incident ray is four times of micromirror rotation angle in the DMD device.
Advantage of the present invention
1 has increased the separation degree of imaging optical path and illumination path, has reduced the parasitic light in the projecting light path, thereby can improve the contrast of system.
2 are used a color-separation and color-recombination prism, two color filters and two aluminium reflectors, have simple in structure, lightweight advantage.
Description of drawings:
Fig. 1 is a background technology color separating and combining system structural drawing.
Fig. 2 is a DMD optical modulation synoptic diagram in the background technology.
Fig. 3 is a DMD optical modulation synoptic diagram among the present invention.
Fig. 4 is the structural drawing of color separating and combining system 1 of the present invention.It also is Figure of abstract.
Fig. 5 is the structural drawing of color separating and combining system 2 of the present invention.
Embodiment:
The present invention includes the X prism P1 with color-separation and color-recombination function, operating angle is 45 ° red color filter P2 and blue color filter P3, aluminium reflector M1, M2, the DMD device G of the DMD device R of modulated red light, modulation green glow, the DMD device B of modulation blue light.
Embodiment 1
Each optical element and system light path describe light path for convenient as shown in Figure 4, set up the XY plane coordinate system.40 ° of illumination path and projecting light path's angles, projecting light path's paralleled by X axis, colour splitting prism is that operating angle is 45 ° an X prism, the rotation diagonal axis vertical light plane of incidence of three DMD device R, G, B is placed.
X prism P1 resolves into the red-green-blue light beam with the illuminating bundle of incident; Green glow sees through colour splitting prism P1 and instead is radiated on the DMD device G that modulates green glow after being popular in bluish-green color filter P2, green glow is reflected back along former road during dark attitude, the direction of propagation of green glow is changed 140 ° during bright attitude, reflex in the projecting light path parallel, pass through two color filters of P2 and P3 successively with X-axis.The direction of propagation of ruddiness is changed 90 ° by colour splitting prism P1, be radiated on the DMD device R of modulated red light, ruddiness is reflected back along former road during dark attitude, the direction of propagation of ruddiness is changed 140 ° during bright attitude, parallel Y direction and incide on the red color filter P2 with 45, color filter synthesizes ruddiness and green glow in projecting light path.The direction of propagation of blue light is changed-90 ° by colour splitting prism A1, incide on the aluminium mirror M2 with 40 ° of angles earlier, be mapped on the DMD device B of modulation blue light by the aluminium mirror reversal again, blue light reflects back along former road during dark attitude, the direction of propagation of blue light is changed 140 ° during bright attitude, parallel Y direction and incide on the saturating red green color filter P3 of anti-indigo plant with 45, color filter P3 synthesizes blue light and red-green glow in projecting light path.The three primary colours light beam that is synthesized together at last projects on the screen through projection lens set.
Embodiment 2
Each optical element and system light path are as shown in Figure 5.40 ° of illumination path and projecting light path's angles, projecting light path's paralleled by X axis, color-combination prism is that operating angle is 45 ° an X prism, the rotation diagonal axis vertical light plane of incidence of three DMD device R, G, B is placed.
Illuminating bundle at first incides on the red color filter P2, and ruddiness composition is wherein reflexed on the DMD device R of modulated red light by P2, and blue green light incides on the aluminium reflector M1 through P2; By the ruddiness after the R modulation, dark attitude light reflects back along former road, and the then parallel Y direction of bright attitude light incides color-combination prism P1; The blue green light mirror M1 that is reflected reflexes on the blue color filter P3, blue light ingredient is reflected by P3, the green glow composition is radiated on the DMD device G of modulation green glow after directly seeing through P3, green glow is reflected back along former road during dark attitude, the direction of propagation of green glow is changed 140 ° during bright attitude, reflex in the projecting light path parallel, pass through P3 and P1 successively with X-axis.Blue light is reflexed to by P3 on the DMD device B of modulation blue light, and after the B modulation, its dark attitude light is reflected back along former road, and the direction of propagation of bright attitude light is changed 140 °, and parallel Y-axis incides on the color-combination prism P1; Last color-combination prism P1 is synthesized together three coloured light through projection lens set and projects on the screen.
Claims (3)
1. a digital optical processing projection display device color-separation color-combination optical is united, comprise: three DMD device R, G, B that modulate red, green, blue three primary colours light respectively, it is characterized in that also comprising: X prism (P1), red color filter (P2), the blue color filter (P3) of color-separation and color-recombination function are arranged, two aluminium reflectors (M1 and M2); The DMD device at work, dark attitude light becomes 180 ° of angles with incident ray; The angle of bright attitude light and incident ray is four times of micromirror rotation angle in the DMD device, and color-separation and color-recombination prism (P1), red color filter (P2), blue color filter (P3) and aluminium reflector (M1 and M2) make up respectively, realizes two kinds of color-separation and color-recombination structures of A, B.
2. a kind of digital optical processing projection display device color-separation color-combination optical system according to claim 1, it is characterized in that structure A: color-separation and color-recombination prism (P1) is decomposed into the red-green-blue light beam with the illuminating bundle of incident, becomes the color separation structure; Image three-colo(u)r after red color filter (P2) and blue color filter (P3) are modulated three DMD devices is synthesized together, and becomes and closes the look structure.
3. a kind of digital optical processing projection display device color-separation color-combination optical system according to claim 1, it is characterized in that structure B: red color filter (P2) and blue color filter (P3) are decomposed into the red-green-blue light beam with the illuminating bundle of incident, become the color separation structure; The color-separation and color-recombination prism
(P1) image three-colo(u)r after three DMD device modulation is synthesized together, becomes and close the look structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100172075A CN101149483A (en) | 2006-09-22 | 2006-09-22 | Digital optical processing projection display device color-separation color-combination optical system |
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|---|---|---|---|
| CNA2006100172075A CN101149483A (en) | 2006-09-22 | 2006-09-22 | Digital optical processing projection display device color-separation color-combination optical system |
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| CN101149483A true CN101149483A (en) | 2008-03-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661211B (en) * | 2008-08-26 | 2011-05-04 | 佛山普立华科技有限公司 | Projector |
| CN108881889A (en) * | 2018-07-26 | 2018-11-23 | 四川长虹电器股份有限公司 | The historical relic 3D methods of exhibiting shown based on light field |
-
2006
- 2006-09-22 CN CNA2006100172075A patent/CN101149483A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661211B (en) * | 2008-08-26 | 2011-05-04 | 佛山普立华科技有限公司 | Projector |
| CN108881889A (en) * | 2018-07-26 | 2018-11-23 | 四川长虹电器股份有限公司 | The historical relic 3D methods of exhibiting shown based on light field |
| CN108881889B (en) * | 2018-07-26 | 2020-03-17 | 四川长虹电器股份有限公司 | 3D cultural relic display method based on light field display |
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