CN101995743A - Optical projection engine with uniform brightness and color - Google Patents
Optical projection engine with uniform brightness and color Download PDFInfo
- Publication number
- CN101995743A CN101995743A CN2009101094861A CN200910109486A CN101995743A CN 101995743 A CN101995743 A CN 101995743A CN 2009101094861 A CN2009101094861 A CN 2009101094861A CN 200910109486 A CN200910109486 A CN 200910109486A CN 101995743 A CN101995743 A CN 101995743A
- Authority
- CN
- China
- Prior art keywords
- light
- color
- optical engine
- polarization
- projecting optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Projection Apparatus (AREA)
Abstract
The invention relates to an optical projection engine with uniform brightness and color, which comprises a light source module, a polarizing converter, a polarizing beam splitter, a micro display panel and a projection lens, wherein the polarizing converter is provided with a first polarizing beam splitting face; the polarizing beam splitter is arranged on the emergent light path of the polarizing converter and is provided with a second polarizing beam splitting face. If the incidence angle of incident light to the first polarizing beam splitting face is smaller than 45 DEG, then the incidence angle to the second polarizing beam splitting face is greater than 45 DEG; and if the incidence angle of the incident light to the first polarizing beam splitting face is greater than 45 DEG, then the incidence angle to the second polarizing beam splitting face is smaller than 45 DEG. The optical engine partially compensates uniformity variation caused by different incident angles by balancing the two incidence angles, so that the brightness and the color of light irradiating the micro display panel are uniform. The optical engine has the advantages of simple structure and good projection display effect, and is especially applicable to liquid crystal projection using a light source with a large angle of divergence.
Description
Technical field
The present invention relates to projection display technique, relate in particular to a kind of employing Vernonia parishii Hook angle light source, brightness and the uniform projecting optical engine of color.
Background technology
In recent years, crystal projection technology is widely used in aspects such as electronic teaching, office, commercial affairs and advertisement recreational.And along with the raising day by day of development of science and technology and people's living standard, the crystal projection technology also develops towards the high image quality direction.
Generally (Liquid Crystal on Silicon is LCOS) with the first-class composition of projection lens by lighting device, polarizing beam splitter, reflective type silicon-based liquid crystal panel in existing crystal projection.Wherein, the normal employing of lighting device has luminescence efficiency height, long led light source of life-span, the output illumination light, behind polarizing beam splitter, the illumination liquid crystal panel, afterwards, modulate the polarized light that carries image information by liquid crystal panel, enter polarizing beam splitter once more,, output to external screen from projection lens by projection lens projects.Yet, because the angle of divergence of led light source outgoing beam is bigger, when when having the polarizing beam splitter of polarization light-dividing surface, because present polarization light-dividing surface has angular effect, make the transmitance of incident light or reflectivity along with angle and wavelength change and change, it is bigger to fluctuate, and in the time of obviously can making illumination light irradiating liquid crystal panel, uneven phenomenon occurs.For the light of same wavelength, because the difference of incident angle, the difference of its transmissivity or reflectivity can cause the inhomogeneous of the brightness that shines on the liquid crystal panel, influences the Projection Display quality.In addition, the rule of the angular effect of the light of different wave length is also different, and when causing shining same liquid crystal panel, it is even irregular colour to occur, and the unevenness of aggravating whole crystal projection worsens the Projection Display quality.
Summary of the invention
In view of this, must provide a kind of simple in structure, the uniform projecting optical engine of brightness and color, be applicable to and adopt Vernonia parishii Hook angle light source, make the illumination light brightness and the color that shine little display panel even, Projection Display is effective, can satisfy the high-quality demand in market.
The uniform projecting optical engine of a kind of brightness and color comprises the light source module, polarization converter, polarizing beam splitter, little display panel and projection lens.The light source module shines described little display panel.Polarization converter has first polarization light-dividing surface.Polarizing beam splitter is arranged on the emitting light path of described polarization converter, has second polarization light-dividing surface.Little display panel is modulated incident light, and modulates the image light that carries image information.Projection lens is used for the visual information projection on described little display panel is imaged onto screen.Wherein, if incident light to the incident angle of described first polarization light-dividing surface less than 45 °, then to the incident angle of described second polarization light-dividing surface then greater than 45 °; If incident light to the incident angle of described first polarization light-dividing surface greater than 45 °, then to the incident angle of described second polarization light-dividing surface then less than 45 °.
Projecting optical engine of the present invention, by the incident angle of incident light to the first polarization light-dividing surface and the mode that lays respectively at 45 ° both sides to the incident angle of second polarization light-dividing surface, part has compensated the inhomogeneity variation that the difference owing to incident angle causes, and then make the illumination light brightness and the color that shine little display panel even, simple in structure, Projection Display is effective, can satisfy the high-quality demand in market, is particularly useful for adopting the crystal projection of Vernonia parishii Hook angle light source.
Description of drawings
In order to be easy to explanation, the present invention is done to describe in detail by following preferred embodiment and accompanying drawing.
Fig. 1 a is the brightness of first embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 1 b is the synoptic diagram of optic path between polarization converter and polarizing beam splitter among Fig. 1 a;
Fig. 2 is the brightness of second embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 3 is the brightness of third embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 4 is the brightness of four embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 5 is the brightness of fifth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 6 is the brightness of sixth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 7 is the brightness of seventh embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 8 is the brightness of eighth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color;
Fig. 9 is the brightness of ninth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 a is depicted as the brightness of first embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color, and it comprises light source module 10, polarization converter 20, polarizing beam splitter 30, little display panel 40 and projection lens (not shown).
The little display panel 40 of light source module 10 irradiations, it comprises light-emitting component 102, and the shaping mirror group 103 that is used to collect the received light beam of also shaping.In the embodiment of the present invention, light-emitting component 102 is that (Light Emitting Diode, LED) chip are used to send 180 ° light to light emitting diode.And led chip is connected with the controller (not shown), and the sequential that is used for control chip is luminous.Working frequency of chip is set by the required illumination parameter of little display panel, shows best colour vision effect to reach.Again, the quantity of this led chip can be one, also can be a plurality of for what arrange with array way.Adopt of the arrangement of a plurality of led chips, help improving the luminous flux of entire lighting device, and then increase the luminance brightness of projected light beam with array way.In addition, shaping mirror group 103 comprises two tactic positive lenss.In the embodiment of the present invention, be the positive lens of two falcates, its material is a glass, and series arrangement is between light-emitting component 102 and polarization converter 20.
In other embodiment of the present invention, also can adopt plano-convex lens or biconvex lens to form the shaping mirror group, and the quantity of positive lens can be one, also can repeat no more for more than two here.
In the embodiment of the present invention, the quantity of polarization converter 20 is one, is made up of a plurality of parallelogram prisms 211 that are glued at one and two right-angle triangle prisms 212.Wherein, tactic each parallelogram prism 211 all is arranged between two right-angle triangle prisms 212, and first polarization light-dividing surface 221 is arranged on all faying faces between each prism.Be respectively equipped with 1/2nd wave plates 231 on the exit facet of part prism, this 1/2nd wave plate 231 is used for a kind of polarization state light is converted to another kind of polarization state light, for example the P linearly polarized light is converted to the S linearly polarized light, or the S linearly polarized light is converted to the P linearly polarized light.In the embodiment, 1/2nd wave plates 231 are arranged on the prism facets of whole P linearly polarized lights ejaculations.Polarization converter 20 also comprises light shield layer 241, is arranged on the plane of incidence of the prism that is provided with 1/2nd wave plates 231, is used to avoid veiling glare to enter.
In other embodiment of the present invention, polarization converter can also compose other shape by other prism.On the faying face between each prism first polarization light-dividing surface or reflecting surface can be set, and, first polarization light-dividing surface and reflecting surface alternate configurations.
Polarizing beam splitter 30 is arranged on the emitting light path of polarization converter 20, has second polarization light-dividing surface 301.In the embodiment of the present invention, the rule of the angular effect of first polarization light-dividing surface 221 is identical with the rule of the angular effect of second polarization light-dividing surface 301.In the embodiment of the present invention, polarization light-dividing surface 221,301 is formed by polarization spectro membrane stack or wire grid array etc.Again, polarizing beam splitter 30 is the lens type polarizing beam splitter, compose cube shaped by two triangular prisms, surface of contact is provided with second polarization light-dividing surface 301 therebetween, by this second polarization light-dividing surface 301 the S linearly polarized light in the incident light, P linearly polarized light is separated.Certainly, polarizing beam splitter 30 also can compose other shape by other prism, as long as the S linearly polarized light in the incident light, P linearly polarized light can be separated.
In other embodiment of the present invention, this polarizing beam splitter 30 also can be replaced by flat polarizing beam splitter (consulting Fig. 4).
In the embodiment of the present invention, the extended line of the extended line of first polarization light-dividing surface 221 and second polarization light-dividing surface 301 intersects.If incident light to the incident angle of this first polarization light-dividing surface 221 less than 45 °, then to the incident angle of this second polarization light-dividing surface 301 then greater than 45 °; Otherwise, if incident light to the incident angle of this first polarization light-dividing surface 221 greater than 45 °, then to the incident angle of this second polarization light-dividing surface 301 then less than 45 °.Consult Fig. 1 b, in the embodiment of the present invention, the setting that is orthogonal of the extended line of the extended line of first polarization light-dividing surface 221 and second polarization light-dividing surface 301, and the incident angle of first polarization light-dividing surface 221 that arrives with to the incident angle of second polarization light-dividing surface 301 complementary angle each other.
The polarization conversion principle of embodiment of the present invention is: if incident light incides first polarization light-dividing surface 221 of polarization converter 20 respectively with the incident angle of A1, B1, because the effect of polarization light-dividing surface 221, natural light is separated into the first linearly polarized light P
1, P
2With the second linearly polarized light S
1, S
2The first linearly polarized light P that separates
1, P
2Directly pass prism, be incident to 1/2nd wave plates 231, be converted to another second linearly polarized light s1, s2, outgoing is to polarizing beam splitter 30; And the second linearly polarized light S that separates
1, S
2Then be reflected onto another adjacent first polarization light-dividing surface 221, by another first polarization light-dividing surface 221 with the second linearly polarized light S
1Reflex to polarizing beam splitter 30.This second linearly polarized light S
1, S
2And another second linearly polarized light s1, s2 all enter second polarization light-dividing surface 301 of polarizing beam splitter 30 with identical incident angle A2, B2.
In other embodiment of the present invention, the position (consulting Fig. 3) by 1/2nd wave plates 231 in the conversion polarization converter 20 can also all be converted to the P linearly polarized light to incident light, and outgoing is to polarizing beam splitter 30.
Usually, when the design polarization light-dividing surface, the transmissivity of 45 ° of incident angles is the highest.In 0 ° to 45 ° angular range, incident angle is more little, and transmissivity is low more; In 45 ° to 90 ° angular range, incident angle is big more, and transmissivity is more little.Among the present invention, because the incident angle of incident light to the first polarization light-dividing surface 221 and the both sides that lay respectively at 45 ° to the incident angle of second polarization light-dividing surface 301, therefore, by offsetting, part has compensated owing to the different different caused inhomogeneity variations that cause transmissivity of incident angle, has finally improved the illumination uniformity of light that shines little display panel 40.In addition, form example with polarization light-dividing surface 221,301 by the polarization spectro membrane stack, do not considering other forms of energy losses such as absorption, scattering, according to law of conservation of energy, reflectivity=1-transmissivity, therefore, by the counteracting of two incident angles, can partly compensate equally owing to the different different caused inhomogeneity variations that cause reflectivity of incident angle, finally improve the illumination uniformity of light that shines little display panel 40.
In the embodiment of the present invention, 40 pairs of incident lights of little display panel are modulated, and modulate the image light that carries image information.That is, be used for received linearly polarized light is modulated, be converted to another linearly polarized light vertical, and make this another linearly polarized light carry image information with this linearly polarized light.In the present embodiment, little display panel 40 be monolithic reflective type silicon-based liquid crystal panel (Liquid Crystal on Silicon, LCOS).When the linearly polarized light that receives when little display panel 40 is the S linearly polarized light, through after the modulation of little display panel 40, then reflect another linearly polarized light P linearly polarized light that carries image information, behind polarizing beam splitter 30 folded optical paths, this P linearly polarized light is transmitted through on the projection lens.Projection lens in the embodiments of the present invention and the 40 opposing parallel settings of little display panel are used for the visual information projection on little display panel 40 is imaged onto screen.
In other embodiment of the present invention, position by 1/2nd wave plates in the conversion polarization converter, can also all be converted to the P linearly polarized light to incident light, at this moment, the received linearly polarized light of little display panel is the P linearly polarized light, through after the modulation of little display panel, reflect another linearly polarized light S linearly polarized light that carries image information, via polarizing beam splitter this S linearly polarized light is reflexed on the projection lens, mode by the counteracting of two incident angles, can partly compensate the inhomogeneity variation that the difference owing to transmissivity causes equally, and then make the illumination light brightness and the color that shine little display panel even.
Therefore, the uniform projecting optical engine of the brightness of embodiment of the present invention and color, by to the incident angle of first polarization light-dividing surface and the mode that lays respectively at 45 ° both sides to the incident angle of second polarization light-dividing surface, part has compensated the inhomogeneity variation that the difference owing to incident angle causes, and then make the illumination light brightness and the color that shine little display panel even, simple in structure, Projection Display is effective, can satisfy the high-quality demand in market, be particularly useful for adopting the crystal projection of Vernonia parishii Hook angle light source.
Figure 2 shows that the brightness of second embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and first embodiment is basic identical, difference is that the light source module of Fig. 2 is the three-color light source module, and it comprises red-light source module 10r, blue light source module 10b, green-light source module 10g and closes the look mirror.Wherein, closing the look mirror is X-type color combination lens 50.
Red-light source module 10r comprises red light-emitting element 102r, and the first shaping mirror group 103r that is used to collect the received red light beam of also shaping.Blue light source module 10b comprises blue light emitting element 102b, and the second shaping mirror group 103b that is used to collect the received blue light light beam of also shaping.Green-light source module 10g comprises green luminescence element 102g, and the 3rd shaping mirror group 103g that is used to collect the received green beam of also shaping.In the embodiment of the present invention, red light-emitting element 102r, blue light emitting element 102b and green luminescence element 102g are light emitting diode (Light Emitting Diode, LED) chip are used to send 180 ° light.And the first shaping mirror group 103r, the second shaping mirror group 103b and the 3rd shaping mirror group 103g all comprise two tactic positive lenss equally, and series arrangement is between light- emitting component 102r, 102b, 103g and X-type color combination lens 50.
X-type color combination lens 50 is arranged at the intersection of the emitting light path of red-light source module 10r, blue light source module 10b and green-light source module 10g, and being used to merge red light beam, blue light light beam and green beam is a branch of light.In the embodiment of the present invention, X-type color combination lens 50 is tabular X-type color combination lens (X-mirror), and it comprises and is configured to forked first flat board, 501, the second dull and stereotyped the 502 and the 3rd flat boards 503.And first flat board, 501, the second dull and stereotyped the 502 and the 3rd dull and stereotyped 503 surfaces all are coated with film (not indicating among the figure).In the embodiment of the present invention, the quantity of positive lens can design according to the size of X-type color combination lens 50 among the first shaping mirror group 103r, the second shaping mirror group 103b and the 3rd shaping mirror group 103g.As a rule, the size of X-type color combination lens 50 is more little, the angle of divergence of the incident beam that it is required is also more little, and the light beam that sends from led chip just needs progressively to reduce to incide through the convergence of more positive lens the angle of divergence of X-type color combination lens 50, to improve the utilization factor of luminous energy.
In other embodiment of the present invention, X-type color combination lens 50 also can adopt four plate pack to synthesize cross shaped head, certainly, X-type color combination lens 50 also can use prism-like X-type color combination lens (X-cube) to replace, red-light source module 10r, blue light source module 10b and green-light source module 10g then are surrounded on this prism-like X-type color combination lens, repeat no more here.
Again, also be provided with compound eye lens group 70 between light source module and the polarization converter 20, be used for that received light is carried out homogenising and handle, it comprises first microlens array 701 and second microlens array of arranging along the light path sequential parallel 702.Wherein, each microlens array all is a plurality of identical or different lenticular array combination.First microlens array 701 is used for light beam is divided into a plurality of beamlets, focuses on second microlens array 702.Second microlens array 702 and integration lens 60 are imaged on little display panel 40 to the lenticule of first microlens array 601 of correspondence together, and different beamlets are overlapped on little display panel 40, thereby uniform illumination is provided.Again, this first microlens array 701 and second microlens array 702 can be integrated in one by transparent entity (as sheet glass), also can be discrete.
In the embodiment of the present invention, compound eye lens group 70 also has the beam shaping function,, the special-shaped hot spot of incident is converted into the rectangular light spot of shape such as little display panel 40 active zones (being generally 4: 3 or 16: 9) that is.In the embodiment, the aspect ratio consistent size of lenticular aspect ratio size and little display panel 40.For example: longitudinal size: lateral dimension is 3: 4 or 9: 16.Employing has the lenticule with little display panel 40 identical aspect ratio, helps obtaining all reasonable illumination hot spot of capacity usage ratio and homogeneity.Again, this lenticule is spherical lens or non-spherical lens.Lenticule is the rectangle lenticule.
In other embodiment of the present invention, the lenticule on the compound eye lens group 70 can also be a circular microlens.Lenticular radius-of-curvature in first microlens array 701 can be identical with lenticular radius-of-curvature in second microlens array 702, also can be different.Certainly, compound eye lens group 70 can also be that a row microlens array that only is bonded by a plurality of identical or different lenticules constitutes.If projecting optical engine is to inhomogeneity less demanding, this compound eye lens group can also be omitted.
In addition, also be provided with integration lens 60 between polarization converter 20 and the polarizing beam splitter 30, be used for shaping and the picture of compound eye lens group 70 is imaged on little display panel 40.
In the embodiment of the present invention, polarization converter 20 is arranged on the place, focal plane of compound eye lens group 70, make the light of compound eye lens group 70 outgoing focus on effective light region of acceptance (non-light shield layer place) of polarization converter 20, make full use of incident light, effectively improve light efficiency, at this moment, light shield layer also can omit.
In other embodiment of the present invention, polarization converter 20 can also be arranged between light source module and the compound eye lens group 70, perhaps be separately positioned between red-light source module, blue light source module, green-light source module and X-type color combination lens (consulting Fig. 7), repeat no more here.
Therefore, the uniform projecting optical engine of the brightness of present embodiment and color, equally by the incident angle of incident light to the first polarization light-dividing surface and the mode that lays respectively at 45 ° both sides to the incident angle of second polarization light-dividing surface, part has compensated the inhomogeneity variation that the difference owing to incident angle causes, and then make the illumination light brightness and the color that shine little display panel even, it is simple in structure to have suffered Design for optical system, and Projection Display is effective, can satisfy the high-quality demand in market; In addition, by compound eye lens group wherein, little display panel that evenly throws light on improves the Projection Display quality.
Figure 3 shows that the brightness of third embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and second embodiment is basic identical, and difference is in the polarization converter 20 ' of Fig. 3 that 1/2nd wave plates 231 ' are arranged on the prism facets of whole S linearly polarized lights ejaculations.Consult Fig. 3,1/2nd wave plates 231 ' are separately positioned on the different prism facets with light shield layer.This polarization converter 20 ' all is converted to the P linearly polarized light to incident light, and outgoing is to polarizing beam splitter 30.
At this moment, little display panel 40 ' received linearly polarized light is the P linearly polarized light, through after the modulation of little display panel 40 ', reflect another linearly polarized light S linearly polarized light that carries image information, via polarizing beam splitter 30 this S linearly polarized light is reflexed on the projection lens (not shown).Therefore, in the embodiment of the present invention, projection lens and 40 ' the adjacent setting of little display panel.At this moment, projection lens is that the S light that will carry image information on little display panel 40 ' carries out projection imaging.
Mode by two incident angles are offset can partly compensate the different caused inhomogeneity variation that causes transmissivity owing to the difference of incident angle equally, and then make the illumination light brightness and the color that shine little display panel even.
Figure 4 shows that the brightness of four embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and second embodiment is basic identical, and difference is that the polarizing beam splitter 30 of Fig. 4 is flat polarizing beam splitters.This flat polarizing beam splitter is the tabular transparent base (as glass, plastic cement etc.) that a surface has the polarization spectro face, perhaps be made by the tabular crystal that produces the polarization spectro effect through PROCESS FOR TREATMENT, the polarizing beam splitter of this structure has the light-receiving angular width, the little advantage such as in light weight of volume helps the microminiaturization of light engine.
Figure 5 shows that the brightness of fifth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and second embodiment is basic identical, and difference is that the polarization converter of Fig. 5 is an extending type polarization converter 21, is made up of a parallelogram prism and a right-angle triangle prism of being glued at one.Wherein, first polarization light-dividing surface is arranged on the faying face of parallelogram prism and right-angle triangle prism, the face relative with this first polarization light-dividing surface, and promptly lateral surface is reflecting surface./ 2nd wave plates are arranged on the prism facets of P linearly polarized light ejaculation, promptly on the right-angle triangle prism end face.This polarization converter 21 all is converted to the S linearly polarized light to incident light, and outgoing is to polarizing beam splitter 30.
In other embodiment of the present invention, this parallelogram prism can also be formed by two right angled isosceles triangle prism gummeds.
Figure 6 shows that the brightness of sixth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and the 5th embodiment is basic identical, distinguish the extending type polarization converter 22 that is Fig. 6 and be made up of a parallelogram prism and two right-angle triangle prisms gummeds, first polarization light-dividing surface is arranged on the faying face of parallelogram prism and right-angle triangle prism./ 2nd wave plates are arranged on the prism facets of S linearly polarized light ejaculation, promptly on the parallelogram prism outgoing end face.This polarization converter 22 all is converted to the P linearly polarized light to incident light, and outgoing is to polarizing beam splitter 30.
At this moment, little display panel 40 ' received linearly polarized light is the P linearly polarized light.And little display panel 40 ' adjacent setting with projection lens.This projection lens is that the S light that will carry image information on little display panel 40 ' carries out projection imaging.
In other embodiment of the present invention, the parallelogram prism can also be formed by two right angled isosceles triangle prism gummeds.In other words, extending type polarization converter 22 is formed by 2 lens type polarizing beam splitter gummeds.
Figure 7 shows that the brightness of seventh embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and second embodiment is basic identical, difference is that the X-type color combination lens 50 ' of Fig. 7 is prism-like X-type color combination lens (X-cube), and red-light source module 10r ', blue light source module 10b ' and green-light source module 10g ' then are surrounded on this prism-like X-type color combination lens.
In the embodiment of the present invention, the quantity of polarization converter is a plurality of, is separately positioned on red-light source module 10r ', blue light source module 10b ', green-light source module 10g ' and closes between the look mirror 50 '.Among the present invention, the structure of polarization converter can be aforesaid any one mode, is extending type polarization converter as shown in Figure 5 in the embodiment, and incident light all is converted to the S linearly polarized light.Consult Fig. 7, the extended line of first polarization light-dividing surface that closes the polarization converter 23 that look mirror 50 ' be arranged in parallel with polarizing beam splitter 30 at interval is crossing with the extended line of second polarization light-dividing surface.And other 2 polarization converters 23 ', 23 " the extended line of first polarization light-dividing surface also intersect with the extended line of second polarization light-dividing surface.
Mode by two incident angles are offset can partly compensate the different caused inhomogeneity variation that causes transmissivity owing to the difference of incident angle equally, and then make the illumination light brightness and the color that shine little display panel even.
In other embodiment of the present invention, the quantity of this polarization converter can also be 1, is arranged on the emitting light path that closes the look mirror.
Consult Fig. 8,, can also all be converted to the P linearly polarized light to incident light by the position of conversion 1/2nd wave plates.At this moment, little display panel 40 ' received linearly polarized light is the P linearly polarized light.And little display panel 40 ' adjacent setting with projection lens.This projection lens is that the S light that will carry image information on little display panel 40 ' carries out projection imaging.
Figure 9 shows that the brightness of ninth embodiment of the invention and the planar structure synoptic diagram of the uniform projecting optical engine of color.The structure of the projecting optical engine of this projecting optical engine and second embodiment is basic identical, and difference is that the look mirror that closes shown in Figure 9 comprises two dichroic mirrors 501 ", 502 ", be obliquely installed respectively in the intersection of the light emitting light path of each light source module.
Say first dichroic mirror 501 in detail " be obliquely installed in the intersection of the light emitting light path of red-light source module 10r, green-light source module 10g, be used for the transmit red light light beam, the reflect green light light beam.Second dichroic mirror 502 " be obliquely installed between blue light source module 10b and compound eye lens group 70, and be parallel to first dichroic mirror 501 ", be used for the transmit blue bundle, reflect red light beam, green beam.
In other embodiment of the present invention, the position of each light source module also can exchange.
In addition, first dichroic mirror 501 " and second dichroic mirror 502 " between, and second dichroic mirror 502 " and compound eye lens group 70 between be respectively arranged with shaping lens 80, be used to reduce the angle of divergence of emergent light.
Therefore, in the embodiment of the present invention, the light beam of each light source module outgoing is by two dichroic mirrors, be merged into a branch of light, inject compound eye lens group, by the mode that two incident angles are offset, can partly compensate different caused inhomogeneity variation equally, and then make the illumination light brightness and the color that shine little display panel even owing to incident angle.
In sum, projecting optical engine of the present invention, by the incident angle of incident light to the first polarization light-dividing surface and the mode that lays respectively at 45 ° both sides to the incident angle of second polarization light-dividing surface, part has compensated the inhomogeneity variation that the difference owing to incident angle causes, and then making the illumination light brightness and the color that shine little display panel even, simple in structure, Projection Display is effective, can satisfy the high-quality demand in market, be particularly useful for adopting the crystal projection of Vernonia parishii Hook angle light source.
The embodiment of the above is a better embodiment of the present invention, be not to limit concrete practical range of the present invention with this, scope of the present invention comprises and is not limited to this embodiment, for example, red light-emitting element, blue light emitting element and green luminescence element are one or a plurality of laser chips of arranging with array way, perhaps incandescent lamp, perhaps arc lamp etc.In addition, between polarization converter and the polarizing beam splitter, close on the polarizing beam splitter place and also be provided with polaroid, contrast of the image that projects with raising etc.The equivalence variation that all shapes according to the present invention, structure are done all comprises in protection scope of the present invention.
Claims (21)
1. brightness and the uniform projecting optical engine of color comprise:
Little display panel is modulated incident light, and modulates the image light that carries image information;
Projection lens is used for the visual information projection on described little display panel is imaged onto screen;
The light source module shines described little display panel;
Polarization converter has first polarization light-dividing surface;
Polarizing beam splitter is arranged on the emitting light path of described polarization converter, has second polarization light-dividing surface;
It is characterized in that, if incident light to the incident angle of described first polarization light-dividing surface less than 45 °, then to the incident angle of described second polarization light-dividing surface then greater than 45 °; If incident light to the incident angle of described first polarization light-dividing surface greater than 45 °, then to the incident angle of described second polarization light-dividing surface then less than 45 °.
2. brightness according to claim 1 and the uniform projecting optical engine of color is characterized in that, described incident light to the incident angle of described first polarization light-dividing surface with to the incident angle of described second polarization light-dividing surface complementary angle each other.
3. brightness according to claim 1 and the uniform projecting optical engine of color is characterized in that the rule of the angular effect of described first polarization light-dividing surface is identical with the rule of the angular effect of described second polarization light-dividing surface.
4. brightness according to claim 1 and the uniform projecting optical engine of color is characterized in that, the uniform projecting optical engine of described brightness and color also comprises:
Compound eye lens group is arranged on the input path of described polarizing beam splitter, is used for received light is carried out homogenising and shaping processing; And
Integration lens is arranged between described compound eye lens group and the polarizing beam splitter.
5. brightness according to claim 4 and the uniform projecting optical engine of color, it is characterized in that, described compound eye lens group is a plurality of identical or different lenticular array combination, the aspect ratio consistent size of described lenticular aspect ratio size and described little display panel.
6. brightness according to claim 5 and the uniform projecting optical engine of color is characterized in that described lenticule is spherical lens or non-spherical lens.
7. brightness according to claim 1 and the uniform projecting optical engine of color is characterized in that described light source module is the three-color light source module, and it comprises:
The red-light source module, its outgoing red light beam, the first shaping mirror group that comprises the red light-emitting element and be used to collect the received red light beam of also shaping;
The blue light source module, its outgoing blue light light beam, the second shaping mirror group that comprises the blue light emitting element and be used to collect the received blue light light beam of also shaping;
The green-light source module, its outgoing green beam, the 3rd shaping mirror group that comprises the green luminescence element and be used to collect the received green beam of also shaping; And
Close the look mirror, being used to merge described red light beam, blue light light beam and green beam is a branch of light.
8. brightness according to claim 7 and the uniform projecting optical engine of color is characterized in that, the described look mirror that closes is an X-type color combination lens, is arranged at the intersection of the emitting light path of described red-light source module, blue light source module and green-light source module.
9. brightness according to claim 8 and the uniform projecting optical engine of color is characterized in that, described X-type color combination lens is tabular X-type color combination lens or prism-like X-type color combination lens.
10. brightness according to claim 7 and the uniform projecting optical engine of color is characterized in that, the described look mirror that closes comprises two dichroic mirrors, is obliquely installed respectively in the intersection of the light emitting light path of each light source module.
11. the uniform projecting optical engine of brightness according to claim 7 and color, it is characterized in that, described red light-emitting element, blue light emitting element and green luminescence element are one or a plurality of light-emitting diode chip for backlight unit of arranging with array way, perhaps laser chip, perhaps incandescent lamp, perhaps arc lamp.
12. the uniform projecting optical engine of brightness according to claim 4 and color is characterized in that described polarization converter is arranged on the emitting light path of described compound eye lens group.
13. the uniform projecting optical engine of brightness according to claim 12 and color is characterized in that, described polarization converter is arranged on the place, focal plane of described compound eye lens group.
14. the uniform projecting optical engine of brightness according to claim 12 and color is characterized in that, the setting that is orthogonal of the extended line of the extended line of described first polarization light-dividing surface and second polarization light-dividing surface.
15. the uniform projecting optical engine of brightness according to claim 4 and color is characterized in that the quantity of described polarization converter is 1, is arranged on the input path of described compound eye lens group.
16. the uniform projecting optical engine of brightness according to claim 7 and color is characterized in that, the quantity of described polarization converter is a plurality of, is arranged at respectively on the emitting light path of described red-light source module, blue light source module, green-light source module.
17., it is characterized in that described polarization converter comprises according to any described brightness of claim 1 to 16 and the uniform projecting optical engine of color:
At least two prisms are glued at one, and described first polarization light-dividing surface all is set on the faying face between each prism, perhaps are arranged alternately first polarization light-dividing surface and reflecting surface; And
/ 2nd wave plates are arranged on the prism facets of whole P linearly polarized lights or all S linearly polarized light ejaculations.
18. the uniform projecting optical engine of brightness according to claim 17 and color is characterized in that described polarization converter also comprises light shield layer, is arranged on the plane of incidence of part prism.
19., it is characterized in that described polarizing beam splitter is flat polarizing beam splitter or lens type polarizing beam splitter according to any described brightness of claim 1 to 16 and the uniform projecting optical engine of color.
20. according to any described brightness of claim 1 to 16 and the uniform projecting optical engine of color, it is characterized in that, close on described polarizing beam splitter place and also be provided with polaroid.
21., it is characterized in that described little display panel is LCOS according to any described brightness of claim 1 to 16 and the uniform projecting optical engine of color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101094861A CN101995743A (en) | 2009-08-21 | 2009-08-21 | Optical projection engine with uniform brightness and color |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101094861A CN101995743A (en) | 2009-08-21 | 2009-08-21 | Optical projection engine with uniform brightness and color |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101995743A true CN101995743A (en) | 2011-03-30 |
Family
ID=43786069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101094861A Pending CN101995743A (en) | 2009-08-21 | 2009-08-21 | Optical projection engine with uniform brightness and color |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101995743A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885276A (en) * | 2012-12-19 | 2014-06-25 | 卡西欧计算机株式会社 | Light source unit able to emit light which is less influenced by interference fringes and projector provided with light source unit |
| CN103901706A (en) * | 2012-12-26 | 2014-07-02 | 深圳市光峰光电技术有限公司 | Light combination light source and lighting device and projection display device using light combination light source |
| CN107045255A (en) * | 2017-02-03 | 2017-08-15 | 中国电子科技集团公司第五十五研究所 | A kind of slim LC projection display LED polarization light sources |
| CN109270779A (en) * | 2018-11-27 | 2019-01-25 | 深圳市微阵技术有限公司 | Novel dynamic image projection system |
| CN112114482A (en) * | 2019-06-20 | 2020-12-22 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112596332A (en) * | 2020-12-23 | 2021-04-02 | 广景视睿科技（深圳）有限公司 | Projection system and projector |
| CN113741029A (en) * | 2020-05-29 | 2021-12-03 | 日立乐金光科技株式会社 | Virtual image projection device |
| CN117705003A (en) * | 2023-12-12 | 2024-03-15 | 湖北久之洋红外系统股份有限公司 | Digital fringe projector optical system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107819A (en) * | 2000-09-29 | 2002-04-10 | Hitachi Ltd | Video display device and driving circuit |
| KR20030079268A (en) * | 2002-04-03 | 2003-10-10 | 삼성에스디아이 주식회사 | A projection display system |
| CN2602397Y (en) * | 2002-05-14 | 2004-02-04 | 邵剑心 | Optical engine for single chip projection system |
| CN101470337A (en) * | 2007-12-27 | 2009-07-01 | 红蝶科技(深圳)有限公司 | Mobile equipment embedded with projector module |
-
2009
- 2009-08-21 CN CN2009101094861A patent/CN101995743A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107819A (en) * | 2000-09-29 | 2002-04-10 | Hitachi Ltd | Video display device and driving circuit |
| KR20030079268A (en) * | 2002-04-03 | 2003-10-10 | 삼성에스디아이 주식회사 | A projection display system |
| CN2602397Y (en) * | 2002-05-14 | 2004-02-04 | 邵剑心 | Optical engine for single chip projection system |
| CN101470337A (en) * | 2007-12-27 | 2009-07-01 | 红蝶科技(深圳)有限公司 | Mobile equipment embedded with projector module |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885276A (en) * | 2012-12-19 | 2014-06-25 | 卡西欧计算机株式会社 | Light source unit able to emit light which is less influenced by interference fringes and projector provided with light source unit |
| CN103901706A (en) * | 2012-12-26 | 2014-07-02 | 深圳市光峰光电技术有限公司 | Light combination light source and lighting device and projection display device using light combination light source |
| CN103901706B (en) * | 2012-12-26 | 2015-12-09 | 深圳市光峰光电技术有限公司 | Close radiant and use lighting device and the projection display equipment of this conjunction radiant |
| CN107045255A (en) * | 2017-02-03 | 2017-08-15 | 中国电子科技集团公司第五十五研究所 | A kind of slim LC projection display LED polarization light sources |
| CN109270779A (en) * | 2018-11-27 | 2019-01-25 | 深圳市微阵技术有限公司 | Novel dynamic image projection system |
| CN112114482A (en) * | 2019-06-20 | 2020-12-22 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN113741029A (en) * | 2020-05-29 | 2021-12-03 | 日立乐金光科技株式会社 | Virtual image projection device |
| CN112596332A (en) * | 2020-12-23 | 2021-04-02 | 广景视睿科技（深圳）有限公司 | Projection system and projector |
| CN112596332B (en) * | 2020-12-23 | 2022-03-11 | 广景视睿科技（深圳）有限公司 | Projection system and projector |
| CN117705003A (en) * | 2023-12-12 | 2024-03-15 | 湖北久之洋红外系统股份有限公司 | Digital fringe projector optical system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201780448U (en) | Projection optics engine with even and clear image | |
| CN101943845A (en) | Efficient miniature projection optical engine | |
| US11243460B2 (en) | Light source device and projection system | |
| CN101361022B (en) | Polarized, multicolor led-based illumination source | |
| CN201464788U (en) | High-efficiency micro projection optical engine | |
| CN101995743A (en) | Optical projection engine with uniform brightness and color | |
| CN101813290A (en) | Tricolor semiconductor illuminator and minitype projection optical engine use same | |
| CN104603689A (en) | Light source device | |
| US9016865B2 (en) | Illumination device and projection type display device using the same | |
| US9551919B2 (en) | Projection apparatus | |
| CN201237156Y (en) | LED light source and liquid crystal projection equipment employing the same | |
| CN102608855A (en) | Lamp optical system for projected display of 3-LCOS (Liquid Crystal On Silicon) laser | |
| CN101546045B (en) | Polarization converter and projection system using same | |
| CN211375295U (en) | Light source module and projection device | |
| CN101750861A (en) | Micro-projection optical engine | |
| CN102330888A (en) | Light mixing type monochromatic light source with function of fluorescent powder excitation and projection optical engine using same | |
| CN201417358Y (en) | Miniature projection optical engine with high lighting effect | |
| CN101101432B (en) | Optical module | |
| CN201402362Y (en) | High light-efficiency minitype projection optical engine | |
| CN101923272A (en) | Miniature projection optical engine based on three-color light source | |
| CN114185232A (en) | Display device | |
| CN101639195A (en) | Light-emitting diode light source device and liquid crystal projecting device using same | |
| TW201349840A (en) | Light source system for stereoscopic projection | |
| CN101762960B (en) | Projector | |
| JP5334219B2 (en) | Polarized light illumination device and projection display device using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Cui Jing Road Shenzhen City, Guangdong province 518118 Pingshan New District No. 35 No. 1 Building 6 East Applicant after: Butterfly Technology (Shenzhen) Limited Address before: 518057, 301, two, Fengyun technology building, Fifth Industrial Zone, North Ring Road, Shenzhen, Guangdong, Nanshan District Applicant before: Butterfly Technology (Shenzhen) Limited |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110330 |