Embodiment
Figure 1 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model first embodiment, it comprises the light source module, polarization converter 13, compound eye (fly ' s eye) lens combination 14, optically focused shaping lens group 15, polarizing beam splitter 16, little display panel 17 of monolithic and projecting lens (not shown).Wherein, the light source module is used for outgoing three look nonpolarized lights, and it comprises a plurality of light-emitting components 11 and shaping mirror group 12.
A plurality of light-emitting components 11 comprise at least one red light-emitting element of outgoing ruddiness, at least one blue light emitting element of outgoing blue light and at least one green luminescence element of outgoing green glow.In the utility model embodiment, red light-emitting element, blue light emitting element and green luminescence element are installed on the same substrate (not indicating among the figure), (Light Emitting Diode, LED) chip are used to send 180 ° light to be light emitting diode.And led chip is connected with the controller (not shown), and the sequential that is used for control chip is luminous.Each 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 four: two green light LED chips, a red LED chip and a blue-light LED chip, also can for arrange with array way more than four.Adopt of the arrangement of a plurality of led chips, help improving the luminous flux of whole light source module, and then increase the luminance brightness of projected light beam with array way.
Shaping mirror group 12 covers a plurality of light-emitting components 11, promptly covers red light-emitting element, blue light emitting element and green luminescence element simultaneously, is used to collect and received red light beam, blue light light beam and the green beam of shaping, reduces the angle of divergence.In the utility model embodiment, shaping mirror group 12 comprises two tactic positive lenss.In the embodiment, be the positive lens of two falcates, its material is a glass, and series arrangement is between a plurality of light-emitting components 11 and polarization converter 13.And the curved surface 121 that closes on polarization converter 13 in the shaping mirror group 12 is aspheric surface, and its single compound eye 141 according to compound eye lens group 14 plane of incidence places carries out little five equilibrium design.Little five equilibrium design as referred to herein is that the pairing lens surface of single compound eye is divided into multistage, adjusts it and goes out light effect, determines shape, and afterwards, the lens surface that merges all single compound eye correspondences is a complete aspheric surface, determines the shape of lens with this.
In other embodiment of the utility model, also can adopt plano-convex lens or biconvex lens to form shaping lens group, and the quantity of positive lens can be one, also can be for more than two, as a rule, the size of the end face at polarization converter 13 reception incident light places is more little, and the angle of divergence of the incident beam that it is required is also more little, the light beam that sends from led chip just needs progressively to reduce to incide through the convergence of more lens the angle of divergence of polarization converter 13, to improve the utilization factor of luminous energy.
Polarization converter 13 is arranged on the emitting light path of light source module, embodiment is on the emitting light path of shaping mirror group 12, be used for received nonpolarized light, be a branch of three look nonpolarized lights of 11 outgoing of a plurality of light-emitting components: the nonpolarized light of red light beam, blue light light beam, green beam, be converted to two bundles with equidirectional advance, the polarized light of same polarization state.This polarization converter 13 comprises at least 3 prisms, quarter-wave plate 132 and reverberator 133.Wherein, at least 3 prisms are glued at one, have a plurality of faying faces, are coated with the polarization spectro rete at least one faying face, are used for three look nonpolarized lights are separated into first polarized light and second polarized light.Reverberator 133 is arranged at a side of prism, is used for the wherein a branch of polarized light of reflection, so that it has identical direct of travel with another bundle polarized light.Quarter-wave plate 132 is arranged between prism and the reverberator, is used for second polarized light is converted to another first polarized light.
Consult Fig. 1, in the utility model embodiment, polarization converter 13 comprises 3 prisms 1311,1312,1333, linear array, is glued at one.Specifically, be 2 right-angle triangle prisms 1311,1312 and be clipped in an isosceles triangle prism 1313 in the middle of it.Wherein, all be coated with the polarization spectro rete on the faying face between isosceles triangle prism 1313 and the right-angle triangle prism 1311,1312.Reverberator 133 is a catoptron, is arranged at 1/2nd exit facet places of isosceles triangle prism 1313.Quarter-wave plate 132 is glued on another 1/2nd end face of isosceles triangle prism 1313.Principle of work is: the nonpolarized light of light source module outgoing is incident to polarization converter 13.When nonpolarized light entered the faying face of isosceles triangle prism 1313 and right-angle triangle prism 1312, because the effect of polarization spectro rete, nonpolarized light was separated into first polarized light and second polarized light, i.e. p1 polarized light and s1 polarized light.Wherein, first polarized light, the p1 polarized light directly passes right-angle triangle prism 1312, and outgoing is to compound eye lens group 14; And second polarized light, the s1 polarized light then is reflected onto on the faying face of isosceles triangle prism 1313 and right-angle triangle prism 1311, by entering quarter-wave plate 132 after this faying face reflection, incide on the reverberator 133 after passing quarter-wave plate 132, reverberator 133 makes incident light return prism 1313 along former road, when light beam passes through quarter-wave plate 132 once more, is converted to another first polarized light, be the p2 polarized light, this p2 polarized light passes prism 1311 outgoing to compound eye lens group 14.Herein, the effect of quarter-wave plate 132 is: make second polarized light, promptly s1 polarized light 2 times is by being converted to another first polarized light behind the quarter-wave plate 132, and promptly the p2 polarized light further improves light utilization efficiency.
In the utility model embodiment, light source module and reverberator 133, quarter-wave plate 132 parallel same prism, i.e. the same sides of isosceles triangle prism 1313 of being arranged at.First polarized light through prism 1312 direct transmissions: p1 polarized light, and through reverberator 133 reflections, again after wave plate 132 conversions, another first polarized light from prism 1311 transmissions: the p2 polarized light all exports compound eye lens group 14 to, promptly, the nonpolarized light of light source module outgoing all be converted to two bundles with equidirectional advance, the light of same polarization state, the p polarized light exports compound eye lens group 14 to, improves the efficiency of light energy utilization; Simultaneously, because part light (through the light of reverberator reflection) repeatedly passes through the polarization spectro rete, make another polarized light of outgoing: the p2 polarized light is purer.
In other embodiment of the utility model, because p1 polarized light through prism 1312 direct transmissions, and between the p2 polarized light of prism 1311 transmissions, there is optical path difference, the lens (consulting Fig. 4) of different focal can also be set between prism 1311,1312 and compound eye lens group 14, be used for shaping, to eliminate optical path difference, use the light beam unanimity that is incident upon compound eye lens group 14.
Compound eye lens group 14 is arranged on the emitting light path of polarization converter 13, is used for received polarized light, and for example p1 polarized light, p2 polarized light are done homogenising and handled.In the utility model embodiment, fly's-eye lens and back fly's-eye lens before compound eye lens group 14 comprises.Wherein, each fly's-eye lens constitutes by a plurality of single compound eyes.Preceding fly's-eye lens is used for light beam is divided into a plurality of beamlets, focuses on the fly's-eye lens of back.Back fly's-eye lens is used for single compound eye 141 of corresponding preceding fly's-eye lens is imaged on the little display panel 17 of monolithic, and different beamlets are overlapped on the little display panel 17 of monolithic, thereby uniform illumination is provided.
Optically focused shaping lens group 15 is arranged on the emitting light path of compound eye lens group 14, the little display panel 17 of the monolithic that is used to throw light on, shaping and outgoing meet the hot spot of little display panel 17 sizes of monolithic, and it comprises lens, in the utility model embodiment, it is a plano-convex lens, and, close on the curved surface 151 of compound eye lens group 14, embodiment is a convex surface, be aspheric surface, this aspheric surface is that the single compound eye 142 according to compound eye lens group 14 exit facet places carries out little five equilibrium design.In the utility model, by controlling the angle of each bundle emergent light on each compound eye, make angle, position, the homogeneity of the little display panel 17 of each bundle emergent light irradiation monolithic all controlled, control the brightness of the little display panel 17 of monolithic, realize evenly illumination with this.Therefore, by the design of little five equilibrium, can effectively raise the efficiency and the homogeneity of whole optical engine.
In other embodiment of the utility model, optically focused shaping lens group 15 can also comprise two or more lens, and the curved surface that closes on compound eye lens group 14 is similarly aspheric surface, repeats no more here.
Polarizing beam splitter 16 is arranged on the emitting light path of optically focused shaping lens group 15, is used for polarization input beam and folded optical path.In the utility model embodiment, polarizing beam splitter 16 is the lens type polarizing beam splitter, compose cube shaped by two triangular prisms, be coated with the polarization spectro rete therebetween on the surface of contact, form a polarization light-dividing surface by this polarization spectro rete, this polarization light-dividing surface can be converted to nonpolarized light polarized light and isolate the s polarized light and the p polarized light.Certainly, polarizing beam splitter 16 also can compose other shape by other prism, is converted into the polarized light outgoing as long as satisfy the nonpolarized light of incident.
In other embodiment of the utility model, this polarizing beam splitter 16 also can be replaced by flat polarizing beam splitter.Flat polarizing beam splitter is the tabular transparent base (as glass, plastic cement etc.) that a surface has the polarization spectro rete, 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.
The little display panel 17 of monolithic is arranged at a non-adjacent side of polarizing beam splitter 16 and optically focused shaping lens group 15, be used to modulate the polarized light that carries image information, promptly, be used for received polarized light is modulated, be converted to another polarized light vertical, and make this another polarized light carry image information with this polarized light.In the utility model embodiment, the little display panel 17 of monolithic is the reflective type silicon-based liquid crystal panel, its received polarized light is the p polarized light, after the modulation through the little display panel 17 of monolithic, be converted to the S polarized light that carries image information, and on its reflected back polarizing beam splitter 17,, this S polarized light is reflexed on the projecting lens by polarizing beam splitter 17 folded optical paths.In other words, the little display panel 17 of projecting lens and monolithic is arranged at respectively on the adjacent two sides of polarizing beam splitter 16.At this moment, projecting lens is to be used to throw the polarized light that carries image information, promptly carries the S polarized light of image information.
In other embodiment of the utility model, the little display panel 17 of monolithic can also receive s polarized light (consulting Fig. 2).
Therefore, in the micro projection optical engine based on three-color light source of the present utility model, polarization converter is converted to two bundles to a branch of three look nonpolarized lights of light source module institute outgoing and advances with equidirectional, the polarized light of same polarization state, export compound eye lens group to and carry out the homogenising processing, light after homogenising is handled is successively by the optically focused shaping lens group, behind the polarizing beam splitter, the little display panel of illumination monolithic, be full of whole front panel, afterwards, modulate the polarized light that carries image information by the little display panel of monolithic, enter polarizing beam splitter once more, throw by projecting lens, output to external screen from projecting lens, its design of Optical System process only relates to the light source module, a polarization converter, compound eye lens group, the optically focused shaping lens group, a polarizing beam splitter, little display panel of monolithic and projecting lens do not relate to other optical device (for example closing optical element), employed optical element is less, simple in structure, compactness, good uniformity, efficiency of light energy utilization height, and, light path is shorter, and size is less, satisfies the market microminiaturization, light-weighted demand.
Figure 2 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model second embodiment, the structure of the light engine of this light engine and first embodiment is basic identical, and difference is that light source module shown in Figure 2 and reverberator 233, quarter-wave plate 232 are arranged at the relative both sides of different prisms respectively.This polarization converter 23 comprises 4 right-angle triangle prisms 2311,2312,2313,2314, and gummed constitutes first polarizing beam splitter and second polarizing beam splitter that includes the polarization spectro rete mutually.That is, prism 2311,2312 constitutes first polarizing beam splitter; Prism 2313,2314 constitutes second polarizing beam splitter.The light source module, promptly a plurality of light-emitting components 21, shaping mirror group 22 are arranged at the light entrance face place of first polarizing beam splitter.Reverberator 233, quarter-wave plate 232 are arranged at a side of second polarizing beam splitter.
In the utility model embodiment, the nonpolarized light of light source module outgoing by polarization converter 23 all be converted to two bundles with equidirectional advance, the light of same polarization state, promptly the s polarized light exports compound eye lens group 24 to.Its principle of work is: the nonpolarized light that a plurality of light-emitting components 21 produce is incident to polarization converter 23 by the refraction of shaping mirror group 22.When nonpolarized light was incident to first polarizing beam splitter, because the effect of polarization spectro rete, nonpolarized light was separated into first polarized light (s1 polarized light) and second polarized light (p1 polarized light).Wherein, s1 polarized light reflection back outgoing is to compound eye lens group 24; The p1 polarized light then is transmitted to second polarizing beam splitter, after being transmitted through quarter-wave plate 232, reverberator 233 by second polarizing beam splitter, return second polarizing beam splitter along former road, be converted to another first polarized light (s2 polarized light), by the reflection of second polarizing beam splitter, outgoing is to compound eye lens group 24 again.
Closing on the curved surface that closes on compound eye lens group in the curved surface, optically focused shaping lens group 25 of polarization converter 23 in the shaping mirror group 22 and be aspheric surface, all is to carry out little five equilibrium design according to single compound eye, repeats no more here.
In the utility model embodiment, the polarized light that the little display panel 27 of monolithic receives is the s polarized light.After the modulation through monolithic little display panel 27, will be converted to the P polarized light that carries image information, and with on its reflected back polarizing beam splitter 26, by polarizing beam splitter 26 folded optical paths, with this P polarized light transmission to projecting lens.In other words, projecting lens and the little display panel 27 of monolithic are arranged at the relative both sides of polarizing beam splitter 26, are used to throw the polarized light that carries image information, promptly carry the P polarized light of image information.
In the utility model embodiment, polarizing beam splitter 26 can repeat no more here for lens type polarizing beam splitter or flat polarizing beam splitter.
Figure 3 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model the 3rd embodiment, the structure of the light engine of this light engine and first embodiment is basic identical, difference is that polarization converter shown in Figure 3 33 comprises 3 right- angle triangle prisms 3311,3312,3313, and linear array is glued at one.Wherein 2 prisms 3311,3312 constitute the polarizing beam splitter that contains the polarization spectro rete, and are coated with reflective coating on the inclined-plane of another prism 3313 in 3 prisms.Light source module and reverberator 333, quarter-wave plate 332 are arranged at the adjacent both sides of same prism 3311 respectively.
The principle of work of this polarization converter 33 is: the nonpolarized light of light source module outgoing is incident to polarization converter 33.When nonpolarized light was incident to the polarizing beam splitter that prism 3311,3312 composes, because the effect of polarization spectro rete, nonpolarized light was separated into first polarized light (p1 polarized light) and second polarized light (s1 polarized light).Wherein, the p1 polarized light directly is transmitted through on the prism 3313, the reflection of the reflective coating of process prism 3313 end faces, and outgoing is to compound eye lens group 34; The s1 polarized light then is reflected, and by the prism 3311 that turns back again behind quarter-wave plate 332, the reverberator 333, is converted to another first polarized light, and promptly the p2 polarized light sees through prism 3312 outgoing to compound eye lens group 34.
Figure 4 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model the 4th embodiment, the structure of the light engine of this light engine and first embodiment is basic identical, difference is also to walk abreast between polarization converter shown in Figure 4 43 and the compound eye lens group 44 and is provided with first lens 481 and second lens 482, is used for shaping, eliminates the optical path difference that polarization converter 43 produces.In the utility model embodiment, first lens 481 and second lens 482 are simple lens, and the focal length of first lens 481 is greater than the focal length of second lens 482; By the lens of different focal are set, be used for shaping, eliminate optical path difference, use the light beam unanimity that is incident upon compound eye lens group 44.
In other embodiment of the utility model, first lens and second lens can also be the lens combination that contains a plurality of lens, as long as the satisfied light beam that is incident upon compound eye lens group of using is consistent.
Figure 5 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model the 5th embodiment, the structure of the light engine of this light engine and first embodiment is basic identical, difference is that polarization converter shown in Figure 5 53 comprises a parallelogram prism 531 and a Tp (not indicating among the figure), this parallelogram prism 531 is coated with polarization spectro rete 5311 with the one side that Tp glues together mutually, the one side that this parallelogram prism 531 is relative with being coated with the polarization spectro rete is coated with reflective coating 5312, and uncoated light-emitting face is provided with 1/2nd wave plates 532.This 1/2nd wave plate 532 can be glued on the end face of parallelogram prism 531.In the utility model embodiment, light source module and 1/2nd wave plates 532 are oppositely arranged.
The principle of work of this polarization converter 53 is: the nonpolarized light that a plurality of light-emitting components 51 produce is incident to polarization converter 53 by shaping mirror group 52.When nonpolarized light was incident to the polarization spectro rete 5311 of parallelogram prism 531, because the effect of polarization spectro rete, nonpolarized light was separated into first polarized light (p1 polarized light) and second polarized light (s1 polarized light).Wherein, the p1 polarized light directly is transmitted through compound eye lens group 54; The s1 polarized light then is reflected onto the reflective coating 5312 of parallelogram prism 531 end faces, and by reflective coating 5312 reflections, the deflection of 1/2nd wave plates 532 is converted to another first polarized light (p2 polarized light) outgoing to compound eye lens group 54.
Figure 6 shows that the planar structure synoptic diagram based on the micro projection optical engine of three-color light source of the utility model the 6th embodiment, the structure of the light engine of this light engine and first embodiment is basic identical, difference is that polarization converter shown in Figure 6 63 comprises a flat-plate polarizing beam splitter 631 that is obliquely installed between light source module and compound eye lens group 64, the reverberator 633 that be arranged in parallel with flat-plate polarizing beam splitter 631, and be arranged at 1/2nd wave plates 632 between compound eye lens group 64 and the reverberator 633.Wherein, light source module and 1/2nd wave plates 632 are oppositely arranged.Flat-plate polarizing beam splitter is the tabular transparent base (as glass, plastic cement etc.) that a surface has the polarization spectro rete, 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.
The principle of work of this polarization converter 63 is: the nonpolarized light that a plurality of light-emitting components 61 produce is incident to polarization converter 63 by shaping mirror group 62.When nonpolarized light was incident to flat-plate polarizing beam splitter 631, because the effect of polarization spectro rete, nonpolarized light was separated into first polarized light (p1 polarized light) and second polarized light (s1 polarized light).Wherein, the p1 polarized light directly is transmitted through compound eye lens group 64; The s1 polarized light then is reflected onto reverberator 633, reflexes to 1/2nd wave plates 632 by reverberator 633, and deflection is converted to another first polarized light (p2 polarized light) outgoing to compound eye lens group 64.
Therefore, in the micro projection optical engine based on three-color light source of the present utility model, polarization converter a branch of three look nonpolarized lights of light source module institute outgoing be converted to two bundles with equidirectional advance, the polarized light of same polarization state, improve the efficiency of light energy utilization; Secondly, by being set, compound eye lens group improves homogeneity; In addition, three coloured light that the light source module sends are directly by polarization converter, compound eye lens group, the output of optically focused shaping lens group, behind polarizing beam splitter, offer the little display panel of monolithic, afterwards, the little display panel of monolithic modulates image light and enters projecting lens by polarizing beam splitter once more, output to external screen from projecting lens, the optical element of use is less, though the whole optical system design is based on three-color light source, close optical element but omitted, simple in structure, compact, and light path is shorter, size is less, satisfies market microminiaturization, light-weighted demand.
The embodiment of the above is a better embodiment of the present utility model, be not to limit concrete practical range of the present utility model with this, scope of the present utility model comprises and is not limited to this embodiment, for example, red light-emitting element, blue light emitting element and green luminescence element are laser chip.Reverberator can also be the prism that is coated with reflective coating.In each embodiment, all can between polarization converter and compound eye lens group, be provided for shaping and eliminate the lens of the optical path difference that polarization converter produces.These lens can be first lens and second lens of mutual parallel arranged.And first lens and second lens can be the lens combination that contains a plurality of lens.In addition, the little display panel of monolithic is a transmissive liquid crystal panel etc.The equivalence variation that all shapes according to the utility model, structure are done all comprises in the protection domain of the present utility model.