CN101576701A - Projector with functions of reducing dimension and improving contrast grade - Google Patents

Projector with functions of reducing dimension and improving contrast grade Download PDF

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Publication number
CN101576701A
CN101576701A CNA2008100887857A CN200810088785A CN101576701A CN 101576701 A CN101576701 A CN 101576701A CN A2008100887857 A CNA2008100887857 A CN A2008100887857A CN 200810088785 A CN200810088785 A CN 200810088785A CN 101576701 A CN101576701 A CN 101576701A
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prism
light
angle
projector
micromirror
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CN101576701B (en
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林明坤
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Qisda Corp
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Qisda Corp
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Abstract

The invention discloses a projector with smaller dimension and higher contrast grade, which comprises a prism group, an illumination system and a micro-mirror module. In a luminous state, a light ray emitted by the illumination system is reflected on a screen by the prism group and the micro-mirror module. In a dark state, the light ray emitted by the illumination system is reflected in the projector by the prism group and the micro-mirror module but not reflected to the screen. The prism group comprises two prisms and one dielectric layer. The prism group properly designs the shapes of the two prisms so that the projector enables the reflected light ray to form two times of total internal reflect in the prism group but not be reflected to the screen in the dark state and can reduce the volume of the prism group so as to reduce the dimension of the projector.

Description

Has the projector that reduces size and improve contrast
Technical field
The present invention relates to a kind of projector, more particularly, relate to a kind of projector of prism group to reduce the size while and to improve contrast with innovative design.
Background technology
Please refer to Fig. 1.Fig. 1 is the synoptic diagram of the projector 100 of a background technology tool reduced size.As shown in Figure 1, projector 100 comprises an illuminator 110, a lens group 120, a micro-mirror module (DigitalMicro-mirror Device, DMD) 130 and one prism group (prism assembly) 140.
Illuminator 110 produces light, and injects prism group 140, reflexes to micro-mirror module 130 then, and micro-mirror module 130 reflects light again.Micro-mirror module 130 has a dust cap and a plurality of micromirror M.Micromirror M in the micro-mirror module 130 is used for the light of reflective illumination system 110 via prism group reflection.Each micromirror M according to a turning axle, rotates to bright attitude (onstate) S then respectively according to a control signal ON(the solid line part in Fig. 1 micro-mirror module 130) or extremely dark attitude (offstate) S OFF(dotted portion in Fig. 1 micro-mirror module 130).Micromirror M can be forward or is rotated an angle θ inversely SMore particularly, micromirror M is flat attitude S when not receiving control signal FLAT, be parallel to the dust cap of micro-mirror module 130.When receiving the control of turning signal, micromirror M is anglec of rotation θ forward SWhen receiving the control signal of closing, micromirror M retrograde rotation angle θ STherefore, micromirror M is at bright attitude S ONWith dark attitude S OFFBetween angle be 2 θ SAt bright attitude S ONThe time, micromirror M can reflect incident ray, via prism group 140, enters lens group 120, with ray cast on screen.At dark attitude S OFFThe time, micromirror M can rotate 2 θ SAngle, and with incident ray reflection, via prism group 140, make it by prism group 140 after promptly to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.
Prism group 140 comprises two prism T AWith T BAn and dielectric layer X.Prism T A, prism T BCommon is the glass cylinder, prism T AComprise three plane P 1, P 2And P 3, prism T BComprise three plane P 4, P 5And P 6Dielectric layer X is common to be air layer, is arranged at prism T APlane P 2With prism T BPlane P 4Between.Prism T A, T BHas a refractive index N 1, dielectric layer X has a refractive index N 2, refractive index N 2Less than refractive index N 1, meaning is that dielectric layer X is compared to prism T AWith T BIt is a thin medium.Be incident to prism T when light from illuminator 110 APlane P 2, and incident angle less than prism T AAngle of total reflection situation under, in plane P 2Total reflection takes place.In addition, plane P 3Be parallel to micro-mirror module 130, plane P 5(meaning is promptly perpendicular to the optical axis A of lens group 120 to be parallel to lens group 120 2).Plane P 1With P 2Between angle be β.Plane P 2With P 3Between angle be α.Plane P 6With P 5Between angle be γ, and angle γ is an acute angle or right angle, meaning is that the angle of angle γ is less than or equal to a right angle.
Illuminator 110 is common to be gas-discharge lamp, light is converged and prolongs an optical axis A by the ellipsoid lampshade 1Penetrate.In other words, illuminator 110 is one to have the light source of burnt number f/# (f-number), its optical axis A 1Rough perpendicular to plane P 1
Please continue with reference to figure 1.Illuminator 110 is followed optical axis A 1The light of advancing is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to the plane (being the dust cap of micro-mirror module 130) of micro-mirror module 130, and with the normal angle on the plane of micro-mirror module 130 be θ AOIMicromirror M reflects incident ray more then.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 1) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 1) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.
Please refer to Fig. 2.Fig. 2 is projector 100 not good synoptic diagram of contrast when dark attitude of background technology.The light at illuminator 110 edges is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130.Because illuminator 110 has burnt number F, so the light at illuminator 110 edges is inequality with the radiation direction of central authorities.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 2) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 2) can pass through plane P 3, in plane P 2To P 4Between reflect, be incident upon plane P then 6, and in plane P 6After total reflection takes place, again from plane P 5Penetrate, and as shown in Figure 2, enter lens group 120.So, the contrast of projector 100 just can reduce.
Please refer to Fig. 3.Fig. 3 is the synoptic diagram of the projector 200 of a background technology tool high-contrast.In Fig. 3, except that prism group 240, all the other elements are all identical with projector 100, and related functionality is described and do not repeated them here.
Prism group 240 equally also comprises two prism T AWith T BAn and dielectric layer X.Illuminator 110 is followed optical axis A 1The light of advancing is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130, and with the normal angle of micro-mirror module 130 be θ AOIMicromirror M reflects incident ray more then.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 3) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 3) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.
Please refer to Fig. 4.Fig. 4 is contrast improves in the projector 200 of background technology when dark attitude a synoptic diagram.The light at illuminator 110 edges is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130.Because illuminator 110 has burnt number F, so the light at illuminator 110 edges is inequality with the radiation direction of central authorities.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 4) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 3Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 4) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, and as shown in Figure 4, can't enter lens group 120.So, therefore the contrast of projector 200 can improve.Yet, being compared to prism group 140, prism group 240 has large-size, and makes the volume of projector 200 increase, and also can cause user's inconvenience.
Therefore, the projector 100 of background technology when dark attitude, can't depart from all light lens group 120 (that is, still having veiling glare incident lens group 120), causes the contrast of projector 100 not good, even the situation of light leak is arranged.So poor image quality has improved necessity really.And the projector 200 of background technology strengthens prism T in the prism group 240 for improving contrast BSize, related projector's 200 volumes that influence increase, and cause user's inconvenience.
Summary of the invention
The invention provides a kind of projector that reduces size and improve contrast that has.This projector comprises an illuminator, has a primary optic axis, is used for launching this first light; One micro-mirror module comprises a plurality of micromirror, and these a plurality of micromirror can rotate to one first angle or one second angle; One prism group comprises a dielectric layer, has one with reference to refractive index; One first prism is arranged at one first side of this dielectric layer and has a prismatic refraction rate, this prismatic refraction rate greater than this with reference to refractive index, this first prism be used for receiving this first light and with respect to this first side total reflection, one second light to this micro-mirror module; And one second prism, be arranged at one second side of this dielectric layer and have this prismatic refraction rate; And a lens group, have one second optical axis, when these a plurality of micromirror of this micro-mirror module rotated to this first angle, these a plurality of micromirror reflected this second light and are incident to this lens group via this first prism, this dielectric layer, this second prism; Wherein when these a plurality of micromirror of this micro-mirror module rotate to this second angle, these a plurality of micromirror reflect this second light to this prism group, and this second light penetrates this prism group with the direction away from this second optical axis after via twice total reflection in this prism group.
Description of drawings
Fig. 1 is the synoptic diagram of the projector of a background technology tool reduced size;
Fig. 2 is projector's synoptic diagram that contrast reduces when dark attitude of background technology tool reduced size;
Fig. 3 is the synoptic diagram of the projector of a background technology tool higher contrast;
Fig. 4 is contrast improves in the projector of background technology when dark attitude a synoptic diagram;
Fig. 5 is the synoptic diagram according to the projector of one first embodiment of spirit realization according to the present invention;
The prism group that Fig. 6 utilizes first embodiment of the invention for explanation with improve contrast and and then reduce the synoptic diagram of light leak;
Fig. 7 is the synoptic diagram of the size comparison of the prism group of the projector of prism group and the background technology tool higher contrast of the explanation first embodiment of the present invention;
Fig. 8 is the synoptic diagram according to the projector of one second embodiment of spirit realization according to the present invention;
The prism group that Fig. 9 utilizes second embodiment of the invention for explanation with improve contrast and and then reduce the synoptic diagram of light leak;
Figure 10 is the synoptic diagram of the size comparison of the prism group of the projector of prism group and the background technology tool higher contrast of the explanation second embodiment of the present invention;
Figure 11 is the actual numerical value figure of the present invention according to the angle that limits.
The main element symbol description
100,200,300,400 projectors
110 illuminators
120 lens group
130 micro-mirror module
140,240,340,440 prism groups
T A, T BPrism
P 1, P 2, P 3, P 4, P 5, P 6, P 7The plane
α, β, γ, θ AOI, θ SAngle
S ONBright attitude
S OFFDark attitude
S FLATFlat attitude
A 1, A 2Optical axis
The burnt number of F
The M micromirror
Embodiment
Therefore, the present invention proposes a kind of prism group of improvement, with contrast and the size of taking into account projector.
Please refer to Fig. 5.Fig. 5 is the synoptic diagram according to the projector 300 of one first embodiment of spirit realization according to the present invention.In Fig. 5, except that prism group 340, all the other elements are all identical with projector 100, and related functionality is described and do not repeated them here.
Prism group 340 contracts in the part block with prism group 140, to form shape as shown in Figure 5.Similarly, prism group 340 comprises two prism T AWith T BAn and dielectric layer X.Prism T A, prism T BBe exemplified as the glass cylinder, prism T AComprise three plane P 1, P 2And P 3, prism T BComprise three plane P 4, P 5And P 6Dielectric layer X is exemplified as air layer, is arranged at prism T APlane P 2With prism T BPlane P 4Between.Prism T A, T BHas a refractive index N 1, dielectric layer X has a refractive index N 2, refractive index N 2Less than refractive index N 1In addition, plane P 3Be parallel to micro-mirror module 130, plane P 5(meaning is promptly perpendicular to the optical axis A of lens group 120 to be parallel to lens group 120 2).Plane P 1With P 2Between angle be β.Plane P 2With P 3Between angle be α.Plane P 5With P 6Between angle be γ, and the present invention is an obtuse angle at the angle γ that is characterized as of this embodiment.
Please continue with reference to figure 5.Illuminator 110 is followed optical axis A 1The light of advancing is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130, and with the normal angle of micro-mirror module 130 be θ AOIMicromirror M reflects incident ray again.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 5) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 5) can pass through plane P 3, in plane P 2To P 4Between reflect, be incident upon plane P then 6, in plane P 6Total reflection for the first time takes place, and reflexes to plane P then 5, again in plane P 5Total reflection for the second time takes place, then from plane P 1Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.In addition, Fig. 5 dotted line partly is prism group 140 emitted light under dark attitude of explanation background technology.
Please refer to Fig. 6.The prism group that Fig. 6 utilizes first embodiment of the invention for explanation is to improve contrast and and then to reduce the synoptic diagram of light leak.The light at illuminator 110 edges is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130.Because illuminator 110 has burnt number F, so the light at illuminator 110 edges is inequality with the radiation direction of central authorities.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 6) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 3Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 6) can pass through plane P 3, in plane P 2To P 4Between reflect, be incident upon plane P then 6, in plane P 6Total reflection for the first time takes place, and reflexes to plane P then 5, again in plane P 5Total reflection for the second time takes place, then from plane P 1Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.Compared to the light (Fig. 6 dotted line part) that the projector 100 of background technology penetrates at this state, the present invention will can not enter lens group 120 and cause contrast not good in the light that this state penetrates.So, utilize the prism group 340 of the first embodiment of the present invention, just can be under prism group finite size, effectively improve projector contrast, lower the situation of projector at dark attitude light leak.
Please refer to Fig. 7.Fig. 7 is the prism group 240 sizes synoptic diagram relatively of prism group 340 with the background technology of the explanation first embodiment of the present invention.As shown in the figure, the prism group 340 of the first embodiment of the present invention is compared to the prism group 240 of background technology, still has less size, and can improve the contrast of projector equally.
Please refer to Fig. 8.Fig. 8 is the synoptic diagram according to the projector 400 of one second embodiment of spirit realization according to the present invention.In Fig. 8, except that prism group 440, all the other elements are all identical with projector 100, and related functionality is described and do not repeated them here.
Prism group 440 contracts in the part block with prism group 140, and in plane P 2With P 3Between, an xsect P is set 7, to form shape as shown in Figure 8.Similarly, prism group 440 comprises two prism T AWith T BAn and dielectric layer X.Prism T A, prism T BBe exemplified as the glass cylinder, prism T AComprise the face P of Siping City 1, P 2, P 3And P 7, prism T BComprise three plane P 4, P 5And P 6In other words, prism group 440 is with the prism T of prism group 340 APlane P 2With P 3Clip part, to produce xsect P 7Dielectric layer X is exemplified as air layer, is arranged at prism T APlane P 2With prism T BPlane P 4Between.Prism T A, T BHas a refractive index N 1, dielectric layer X has a refractive index N 2, refractive index N 2Less than refractive index N 1In addition, plane P 3Be parallel to micro-mirror module 130, plane P 5(meaning is promptly perpendicular to the optical axis A of lens group 120 to be parallel to lens group 120 2).Plane P 1With P 2Between angle be β.Plane P 2With P 3Between angle be α.
Please continue with reference to figure 8.Illuminator 110 is followed optical axis A 1The light of advancing is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130, and with the normal angle of micro-mirror module 130 be θ AOIMicromirror M reflects incident ray more then.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 8) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 8) can pass through plane P 3, at xsect P 7Total reflection for the first time takes place, and reflexes to plane P then 2, in plane P 2Total reflection for the second time takes place, then from plane P 1Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.In addition, Fig. 5 dotted line partly is prism group 140 emitted light under dark attitude of explanation background technology.
Please refer to Fig. 9.The prism group that Fig. 9 utilizes second embodiment of the invention for explanation is to improve contrast and and then to reduce the synoptic diagram of light leak.The light at illuminator 110 edges is through plane P 1, inject prism T AAfterwards, in plane P 2Total reflection takes place, through plane P 3, be incident to micro-mirror module 130.Because illuminator 110 has burnt number F, so the light at illuminator 110 edges is inequality with the radiation direction of central authorities.At bright attitude S ONThe time, the light that micromirror M reflected (solid line part among Fig. 9) can pass through plane P 3, in plane P 2To P 4Between reflect, then from plane P 5Penetrate, enter lens group 120.At dark attitude S OFFThe time, the light that micromirror M reflected (dotted portion among Fig. 9) can pass through plane P 2, at xsect P 7Total reflection for the first time takes place, and reflexes to plane P then 2, in plane P 2Total reflection for the second time takes place, then from plane P 1Penetrate, to depart from the optical axis A of lens group 120 2Direction before so that do not enter lens group 120.Compared to the light (Fig. 9 dotted line part) that the projector 100 of background technology penetrates in this state, the present invention will can not enter lens group 120 and cause contrast not good in the light that this state penetrates.Utilize the prism group 440 of the second embodiment of the present invention, just can be under prism group finite size, effectively improve projector contrast, lower the situation of projector at dark attitude light leak.
Please refer to Figure 10.Figure 10 is the prism group 240 sizes synoptic diagram relatively of prism group 440 with the background technology of the explanation second embodiment of the present invention.As shown in the figure, the prism group 440 of the second embodiment of the present invention is compared to the prism group 240 of background technology, has less size, and can improve the contrast of projector equally.
In addition, it should be noted that in the first embodiment of the present invention and second embodiment incident angle θ AOIRough more than or equal to micromirror M angle rotatable 2 θ S, to improve via micro-mirror module 130 light reflected at prism T A, T BPenetrance.For instance, rotatable angle 2 θ of micromirror M SBe 24 when spending, in the projector of background technology, incident angle θ AOIBe set at 24 degree equally, so just can be when bright attitude, the light that illuminator is launched is parallel to the optical axis A of lens group 120 2Penetrate.Yet this kind practice, at light by prism T AEnter into prism T BThe time, incident angle is bigger, and makes that the penetrance of light is lower.And in the present invention, as rotatable angle 2 θ of micromirror M SBe 24 when spending, incident angle θ AOICan be designed to 25 degree.So when bright attitude, the light that illuminator is launched will be via after refraction and the reflection, with the rough optical axis A that is inclined to lens group 120 2Direction penetrate, and can make simultaneously and enter into prism T at light BThe time, incident angle is less, and makes that the penetrance of light is higher.And the present invention adjusts incident angle θ AOIMode, can be the rotation illuminator 110 angle, just adjust optical axis A 1Angle, make optical axis A 1Still with plane P 1Still rough vertical, but incident angle θ AOICan therefore increase to 25 degree.
In addition, the present invention more defines the size of angle α, β and γ, more to improve the contrast of projector.Limit as follows:
α＝(α IN?+α OUT)/2...(1)
β＝α+sin -1[sin(θ AOI)/N 1]...(2)
γ＝(180-θ CRI-α)...(3)
Wherein:
α IN＝θ CRI-sin -1[sin(2θ S-θ CONE)/N 1]
α OUT＝θ CRI-sin -1[sin(θ CONE+θ AOI-2θ S)/N 1]
θ CRI＝sin -1(1/N 1)
θ CONE＝sin -1(NA)
NA＝1/(2F)
Wherein NA be illuminator 110 numerical aperture (Numerical Aperture, NA), angle theta CRIEnter critical angle, the θ of the total reflection condition of prism group of the present invention from air for light CONEBe illuminator 110 emission light beam and optical axis A 1Angle.Because the energy of light source is a Gaussian distribution, α equals α when angle INOr α OUTThe time, the light quantity that projector is projected when bright attitude is minimum.Therefore the present invention just is defined as α with angle α INWith α OUTAverage, the light quantity that so projector is projected when bright attitude just can be maximum.
Please refer to Figure 11.Figure 11 draws the synoptic diagram of the actual numerical value of angle α and β according to above-mentioned qualification for the present invention.As shown in figure 11, in Class1, burnt number F is 2.4, incident angle θ AOIBe set at 24 degree, then α and β be respectively 33.37 and 48.92 spend, in type 3, burnt number F is 2.4, incident angle θ AOIBe set at 26 degree, then α and β are respectively 32.07 and 48.87 degree, and in type 2, burnt number F is 2.4, incident angle θ AOIBe set at 25 degree, then α and β are respectively 32.72 and 48.89 degree.Wherein type 2 has the design of the highest performance for projection function of the present invention.
In sum, the present invention proposes a kind of prism group of improvement, so that projector is when dark attitude, light can be through just penetrating after twice total reflection in the prism group, so can improve projector contrast and and then the phenomenon of light leak when being reduced in dark attitude, the size that also reduces the prism group simultaneously is to increase user's convenience.And according to spirit of the present invention, the prism group of one first embodiment that is proposed can be dwindled prism packet size originally, and then makes and utilize the projector of prism group of the present invention can have less size and have higher contrast ratio simultaneously.And according to spirit of the present invention, the prism group of one second embodiment that is proposed, prism packet size originally can be dwindled equally, and utilize the angle of a prism in the prism group to be the obtuse angle, improve contrast and and then reduce light leakage phenomena, and then make and utilize the projector of prism group of the present invention can have less size and have higher contrast ratio simultaneously.Therefore, the user can utilize prism group provided by the present invention and projector, reduces the usage space of projector, simultaneously and promote the contrast of projector, and obtains bigger convenience.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.

Claims (10)

1. one kind has the projector that reduces size and improve contrast, comprises:
Illuminator has primary optic axis, is used for launching this first light;
Micro-mirror module comprises a plurality of micromirror, and these a plurality of micromirror can rotate to first angle or second angle;
The prism group comprises:
Dielectric layer has one with reference to refractive index;
First prism is arranged at first side of this dielectric layer and has a prismatic refraction rate, this prismatic refraction rate greater than this with reference to refractive index, this first prism be used for receiving this first light and with respect to this first side total reflection, second light to this micro-mirror module; And
Second prism is arranged at second side of this dielectric layer and has this prismatic refraction rate; And
Lens group has second optical axis, and when these a plurality of micromirror of this micro-mirror module rotated to this first angle, these a plurality of micromirror reflected this second light and are incident to this lens group via this first prism, this dielectric layer, this second prism;
Wherein when these a plurality of micromirror of this micro-mirror module rotate to this second angle, these a plurality of micromirror reflect this second light to this prism group, and this second light penetrates this prism group with the direction away from this second optical axis after via twice total reflection in this prism group.
2. projector as claimed in claim 1, wherein this first prism comprises:
First, be used for receiving this first light;
Second, connect this first and be arranged at this first side of this dielectric layer, be used for reflecting this first light to form this second light; And
The 3rd, connect this first and this second, and be parallel to this micro-mirror module.
3. projector as claimed in claim 2, wherein this second prism comprises:
Fourth face is arranged at this second side of this dielectric layer;
The 5th, connect this fourth face and perpendicular to this second optical axis of this lens group; And
The 6th, connect this fourth face and the 5th, when these a plurality of micromirror of this micro-mirror module rotate to this second angle, these a plurality of micromirror reflect the 6th of this second light to the second prism, this second light is in the 6th of this second prism the 5th that the prism of total reflection to the second for the first time takes place, and takes place to penetrate this prism group with the direction away from this second optical axis after the total reflection for the second time at the 5th.
4. projector as claimed in claim 3, wherein when these a plurality of micromirror of this micro-mirror module rotate to this first angle, these a plurality of micromirror reflect this second light, this second light via the 3rd of this first prism, this second of this first prism, this fourth face of this dielectric layer, this second prism and this second prism the 5th to this lens group.
5. projector as claimed in claim 3, wherein second first angle α with the 3rd of this of this first prism sets according to following formula:
α＝(α IN+α OUT)/2；
α IN＝θ CRI-sin -1[sin(2θ S-θ CONE)/N 1]；
α OUT＝θ CRI-sin -1[sin(θ CONE+θ AOI-2θ S)/N 1]；
θ CRI=sin -1(1/N 1); And
θ CONE＝sin -1(NA)；
Wherein α represents this first angle, the N between this second and the 3rd 1Be this prismatic refraction rate, θ AOIBe incident in incident angle, 2 θ of this micro-mirror module via this prism group for this second light SDifference, θ for this first angle and this second angle CRIThe cirtical angle of total reflection, the NA that enter this prism group for light are numeric aperture values, the θ of this illuminator CONEThis first light and this primary optic axis angle for this illuminator.
6. projector as claimed in claim 5, wherein this θ AOIBe slightly larger than this 2 θ approximately S
7. projector as claimed in claim 5, wherein first this one second angle of second with this first prism of this of this first prism sets according to following formula:
β＝α+sin -1[sin(θ AOI)/N 1]；
Wherein β be this first of this first prism with this this second angle of second.
8. projector as claimed in claim 7, wherein the 5th of this second prism the one the 3rd angle with the 6th sets according to following formula:
γ＝(180-θ CRI-α)；
Wherein γ be the 5th of this second prism with the 6th the 3rd angle.
9. projector as claimed in claim 2, wherein this first prism more comprises an xsect, is arranged between this second and the 3rd of this first prism.
10. projector as claimed in claim 9, wherein when these a plurality of micromirror of this micro-mirror module rotate to this second angle, these a plurality of micromirror reflect this second light this xsect to this first prism, this second to this first prism of total reflection for the first time takes place in this xsect of this first prism in this second light, and penetrates this first prism with the direction away from this second optical axis after this second generation total reflection for the second time of this first prism.
CN2008100887857A 2008-05-07 2008-05-07 Projector with functions of reducing dimension and improving contrast grade Active CN101576701B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2008100887857A CN101576701B (en) 2008-05-07 2008-05-07 Projector with functions of reducing dimension and improving contrast grade

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105403985A (en) * 2015-12-30 2016-03-16 中国华录集团有限公司 Miniaturized TIR prism system for DLP projector
US10620522B2 (en) 2014-09-04 2020-04-14 Bae Systems Plc DMD projector with TIR prism
CN113671780A (en) * 2021-08-31 2021-11-19 青岛海信激光显示股份有限公司 Light emitting unit, light source system, and laser projection apparatus
CN113671776A (en) * 2021-08-31 2021-11-19 青岛海信激光显示股份有限公司 Light emitting unit, light source system, and laser projection apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10620522B2 (en) 2014-09-04 2020-04-14 Bae Systems Plc DMD projector with TIR prism
CN105403985A (en) * 2015-12-30 2016-03-16 中国华录集团有限公司 Miniaturized TIR prism system for DLP projector
CN105403985B (en) * 2015-12-30 2018-04-20 中国华录集团有限公司 DLP projector miniaturization TIR prism system
CN113671780A (en) * 2021-08-31 2021-11-19 青岛海信激光显示股份有限公司 Light emitting unit, light source system, and laser projection apparatus
CN113671776A (en) * 2021-08-31 2021-11-19 青岛海信激光显示股份有限公司 Light emitting unit, light source system, and laser projection apparatus
CN113671776B (en) * 2021-08-31 2023-03-07 青岛海信激光显示股份有限公司 Light emitting unit, light source system, and laser projection apparatus

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