CN211352342U - Projector with a light source - Google Patents

Abstract

The utility model provides a projector, including laser fluorescence light source and colour separation optical system, the light beam that laser fluorescence light source sent forms discontinuous spectrum, discontinuous spectrum includes first wave band and the second wave band of alternate segregation, form no light wave band between first wave band and the second wave band, colour separation optical system includes first dichroic mirror, first dichroic mirror has the spectral characteristic of settlement, the transition spectral band between reflectance spectral band and the spectral transmittance section among the spectral characteristic corresponds with no light wave band, first dichroic mirror passes through spectral characteristic and separates the light beam that laser fluorescence light source sent into first chromatic light and second chromatic light, the projector that provides in this application is through corresponding the spectral characteristic of settlement of first dichroic mirror and laser fluorescence light beam's no light wave band, the influence of the drift of spectrum to actual beam splitting result has been reduced, the monochromatic field homogeneity of first chromatic light after having guaranteed the beam splitting, so that the color of the light beam transmitted by the projector is more uniform.

Description

Projector with a light source

Technical Field

The utility model relates to a show technical field, particularly, relate to a projector.

Background

In the field of projection technology, a liquid crystal display projector adopts a 3-piece High Temperature Polysilicon (HTPS) LCD liquid crystal panel, referred to as a 3LCD projector, a system generally divides white light generated by a light source into RGB monochromatic lights, which are modulated by corresponding RGB liquid crystal display panels and then synthesized into white light by a light-combining prism, and the white light enters a lens, and a dichroic film on a dichroic sheet is an optical interference film, spectral characteristics of the split color light change with the angle change of incident light, as shown in fig. 1, when the incident angle of light is larger, the half-power wavelength (point with transmittance of 50%) of the spectrum shifts to shorter wavelengths, and thus, the monochromatic fields of the split color light are not uniform.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a projector is provided to solve above problem.

The embodiment of the utility model provides an above-mentioned purpose is realized through following technical scheme.

The embodiment of the utility model provides a projector, including laser fluorescence light source and colour separation optical system, the light beam formation discontinuous spectrum that laser fluorescence light source sent, discontinuous spectrum includes first wave band and the second wave band of alternate segregation, forms no dark wave band between first wave band and the second wave band, colour separation optical system includes first dichroic mirror, first dichroic mirror has the spectral characteristic of settlement, transition spectral band between reflectance spectrum section and the transmission spectrum section is located among the spectral characteristic no dark wave band, first dichroic mirror passes through spectral characteristic will the light beam separation that laser fluorescence light source sent is first chromatic light and second chromatic light, wherein, first chromatic light with first wave band corresponds, the second chromatic light with the second wave band corresponds.

In some embodiments, the wavelength range of the non-optical band is between 470nm and 490 nm.

In some embodiments, the first color light is blue light.

In some embodiments, the projector further includes a second dichroic mirror, located in an optical path formed by the second color light, for separating the second color light into third color light and fourth color light.

In some embodiments, the third color light is red light, the fourth color light is green light, and the optical path length formed by the third color light is longer than that formed by the fourth color light.

In some embodiments, the projector further includes a first condensing lens disposed in the optical path formed by the second color light and located between the first dichroic mirror and the second dichroic mirror, so that the second color light forms a telecentric optical path at the second dichroic mirror.

In some embodiments, the projector further includes a light modulation system including a first modulation portion, a second modulation portion, and a third modulation portion, the first modulation portion being disposed in a light path formed by the first color light, the second modulation portion being disposed in a light path formed by the third color light, and the third modulation portion being disposed in a light path formed by the fourth color light.

In some embodiments, the projector further includes a second condenser lens provided in an optical path formed by the first color light, the second condenser lens being provided between the first dichroic mirror and the first modulation section.

In some embodiments, the projector further includes a third condensing lens provided in an optical path formed by the third color light, the third condensing lens being located between the second dichroic mirror and the third modulating portion.

In some embodiments, the projector further includes at least two relay lenses, and the two relay lenses are disposed in the optical path formed by the third color light.

In some embodiments, the projector further includes a first lens array, a second lens array, and a fourth condensing lens, the first lens array, the second lens array, and the fourth condensing lens are sequentially disposed between the laser fluorescent light source and the first dichroic mirror, and the first lens array is configured to separate the light source light emitted by the laser fluorescent light source into a plurality of partial light beams; the second lens array is used for condensing the plurality of partial light beams.

In some embodiments, the first modulation section, the second modulation section, and the third modulation section are all liquid crystal displays.

In some embodiments, the projector further includes a polarization conversion system disposed between the laser fluorescence light source and the first dichroic mirror, the polarization conversion system configured to convert the light beam emitted by the laser fluorescence light source into polarized light.

In some embodiments, each of the first, second, and third modulating portions includes a liquid crystal panel and two polarization filters, the liquid crystal panel being located between the two polarization filters.

In some embodiments, the projector further includes a reflective lens disposed in the optical path formed by the third color light to bend the optical path formed by the third color light.

In some embodiments, the projector includes at least two relay lenses, and at least two of the relay lenses are disposed in the optical path formed by the third color light.

The utility model provides a transition spectral band that the projecting apparatus is located the no light wave band of waiting to separate the light beam through the reflection spectral band that makes first dichroic mirror and transmission spectral band between, reduces the drift of the spectrum of first chromatic light to the influence of actual beam split result, has guaranteed the monochromatic field homogeneity of first chromatic light behind the beam split for the colour of the light beam that the projecting apparatus transmission or reflection go out is more even.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of a relationship between P-transmittance and wavelength of a dichroic sheet of a conventional projector according to an embodiment of the present invention;

fig. 2 is a schematic structural light path diagram of a projector according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a spectrum of a laser fluorescence light source and a reflection spectrum of a first dichroic mirror of a projector according to an embodiment of the present invention;

fig. 4 is a schematic structural light path diagram from the laser fluorescent light source to the second dichroic mirror of the projector provided in the embodiment of the present invention.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 2, an embodiment of the present invention provides a projector 100, and the projector 100 may adopt a 3-piece High Temperature Poly Silicon (HTPS) LCD panel, referred to as a 3LCD projector for short.

The optical system adopted by the 3LCD projector can decompose the white light emitted from the laser fluorescent light source 10 into color lights of three colors, namely R (red), G (green) and B (blue), and the three color lights respectively penetrate through the corresponding liquid crystal display panels and project images through the projection lens. The image projected by the 3LCD projector has the characteristics of bright, natural and soft light and the like, and the eyes of a viewer are not damaged by the light.

The projector 100 includes a laser fluorescence light source 10 and a color separation optical system 20, the light beam emitted by the laser fluorescence light source 10 forms a discontinuous spectrum, the discontinuous spectrum includes a first waveband W1 and a second waveband W3 which are separated from each other, a lightless waveband W2 is formed between the first waveband W1 and the second waveband W3, the color separation optical system 20 includes a first dichroic mirror 21, the first dichroic mirror 21 is configured to separate the light beam emitted by the laser fluorescence light source 10 into a first color light LB and a second color light LY, the first color light LB corresponds to the first waveband W1, and the second color light LY corresponds to the second waveband W3.

In one embodiment, the first dichroic mirror 21 implements a set spectral characteristic by a plating process, which is expressed as: a transition spectral band between the reflection spectral band and the transmission spectral band in the spectral characteristics corresponds to the non-light band W2 in the laser fluorescent light source, so that after the laser fluorescent light beam is split by the first dichroic mirror 21, the light beams corresponding to the first band W1 and the second band W3 are separated.

The utility model provides a transition spectral band that projecting apparatus 100 is through between the reflection spectral band with first dichroic mirror 21 and the lens spectral band is located no light wave band W2, as shown in FIG. 3, laser fluorescence light's first wave band W1 is located first dichroic mirror 21's reflection spectral band completely, and laser fluorescence light's second wave band W3 is located first dichroic mirror 21's transmission spectral band completely.

Preferably, the reflection spectrum band of the first dichroic mirror 21 includes the first wavelength band W1 and the reserved wavelength band of the laser fluorescence beam, and the transmission spectrum band of the first dichroic mirror 21 includes the second wavelength band W3 and the reserved wavelength band of the laser fluorescence beam. The reserved waveband is realized by the existence of the non-light spectrum section and the correspondence of the transition spectrum section of the first dichroic mirror 21 and the non-light spectrum section. Because the spectrum of the first dichroic mirror 21 may drift with the size of the incident angle, which may affect the uniformity of the monochromatic field of the first color light LB or the monochromatic field of the second color light LY, the transition spectrum between the reflection spectrum of the first dichroic mirror 21 and the lens spectrum is located in the non-light waveband W2, that is, between the first waveband W1 and the second waveband W3, so that due to the existence of the non-light waveband W2, even if a certain shift occurs, the color lights corresponding to the first waveband W1 and the second waveband W3 may not be affected, and therefore, the color lights after being split may not be affected, that is, the drift of the spectrum of the first dichroic mirror 21 may not affect the actual splitting result, which ensures the uniformity of the monochromatic field of the first color light LB after being split, so that the color of the light beam emitted by the projector 100 is more uniform.

Referring to fig. 2, in the present embodiment, the color separation optical system 20 further includes a second dichroic mirror 22, and the second dichroic mirror 22 is disposed on the optical path formed by the second color light LY to separate the second color light LY into a third color light LR and a fourth color light LG.

In the present embodiment, the first dichroic mirror 21 and the second dichroic mirror 22 are both dichroic mirrors that almost completely transmit light of a certain wavelength and almost completely reflect light of other wavelengths. The first dichroic mirror 21 and the second dichroic mirror 22 are both plane glass, the first dichroic mirror 21 and the second dichroic mirror 22 are arranged in parallel, and the incident light surfaces of the first dichroic mirror 21 and the second dichroic mirror 22 intersect with the emergent light path LP of the laser fluorescent light source 10. As an example: an included angle formed by the incident surface of the first dichroic mirror 21 and the emergent light path LP is smaller than 90 °. As the reflection spectrum of the first color light LB shifts with the incident angle of the light source, as can be seen from fig. 3, the reflection spectrum falls into the non-light band W2, the shift range of the reflection spectrum is located in the non-light band W2, and the reflection spectrum does not fall into the first band W1 or the second band W3, so that the shift of the reflection spectrum does not affect the actual splitting result, the uniformity of the monochromatic field of the first color light LB after splitting is ensured, and further, the projector 100 transmits more uniform white light.

In this embodiment, the first dichroic mirror 21 is an anti-blue-yellow dichroic mirror, the second dichroic mirror 22 is an anti-green-red dichroic mirror, and when the light beam of the laser fluorescence light source 10 is emitted to the first dichroic mirror 21, the light beam is separated into blue light and yellow light, i.e. the first color light LB is blue light, and the second color light LY is yellow light, wherein the yellow light is transmitted through the first dichroic mirror 21, and the blue light is reflected by the first dichroic mirror 21. As shown in fig. 3, in the present embodiment, the first wavelength band W1 has a wavelength band ranging from about 440nm to about 470nm, and the second wavelength band W3 has a wavelength band ranging from about 490nm to about 690 nm. As can be seen from fig. 3, there is substantially no light intensity in the wavelength band between the first wavelength band W1 and the second wavelength band W3, i.e. there is no corresponding colored light in this wavelength band, and this wavelength band is a lightless wavelength band W2, and the wavelength band of the lightless wavelength band W2 is approximately between 470nm and 490nm, i.e. the lightless wavelength band W2 is located between the blue and yellow wavelength bands.

In the present embodiment, the first dichroic mirror 21 includes an incident surface S1, the first color light LB is reflected by the incident surface S1, the incident surface S1 is coated with a functional layer, and the coating of the functional layer on the incident surface S1 can make the reflection spectrum formed by the first color light LB fall in the non-light wavelength band W2, so that the reflection spectrum of the first color light LB does not fall in the first wavelength band W1 and the second wavelength band W3, so as to achieve uniformity of the monochromatic field of the first color light LB after being split. As an example: the functional layer may be a multilayer reflective polarizing film, for example: the functional layer may be a film formed of alternating layers of isotropic and birefringent material; the functional layer may use optical thicknesses distributed in various thicknesses, for example: the thickness distribution of one or both of the functional layers may be monotonically varying. That is, the thickness of the optical repeat unit exhibits a tendency to decrease or increase continuously along the thickness of the multilayer reflective polarizing film (e.g., the thickness of the optical repeat unit does not exhibit a tendency to increase along one portion of the multilayer film and decrease along another portion of the multilayer film). The functional layer may comprise a thickness profile comprising one or more band packets. A band packet is a multilayer stack having a range of layer thicknesses such that the multilayer stack reflects a broadband wavelength. For example, the blue band packet may have an optical thickness distribution such that it reflects blue light, i.e., about 400nm to 500 nm. Here, the specific structure and material of the functional layer are not limited as long as the functional layer enables the reflection spectrum of the first color light LB to fall within the no light wavelength band W2.

Referring to fig. 2 again, in the present embodiment, the projector 100 includes a first lens array 31 and a second lens array 32, the first lens array 31 and the second lens array 32 are sequentially disposed between the laser fluorescent light source 10 and the first dichroic mirror 21, and the first lens array 31 is used for dividing the light source light emitted by the laser fluorescent light source 10 into a plurality of partial light beams; the second lens array 32 is used for condensing the plurality of partial light beams.

The first lens array 31 has a plurality of first microlenses (not shown), wherein the plurality of first microlenses are distributed in an array on at least one of the light incident surface or the light emitting surface of the first lens array 31, the second lens array 32 has a plurality of second microlenses (not shown), and the plurality of second microlenses are distributed in an array on at least one of the light incident surface or the light emitting surface of the second lens array 32. The plurality of micro lenses may be arranged in a rectangular array, an elliptical array, or other shaped array. By providing the first lens array 31 and the second lens array 32, incident light is split and superposed, so that the internal illuminance of the image forming area of the system is substantially uniformized.

In the present embodiment, as shown in fig. 4, the projector 100 further includes a first condensing lens 41, the first condensing lens 41 is disposed on the optical path formed by the second color light LY and is located between the first dichroic mirror 21 and the second dichroic mirror 22, so that the second color light LY forms a telecentric optical path at the second dichroic mirror 22, wherein the number of the first condensing lenses 41 may be 1, 2 or more, as an example, at least two first condensing lenses 41 are disposed on the optical path formed by the second color light LY and are both located between the first dichroic mirror 21 and the second dichroic mirror 22, and the two first condensing lenses 41 are used for realizing the overlapping and telecentric functions of the light beams divided by the first lens array 31.

The two first condensing lenses 41 may be biconvex mirrors or monoconvex mirrors, wherein the incident planes of the two first condensing lenses 41 may be aspheric surfaces or spherical surfaces, the first condensing lens 41 may be low refractive index, low dispersion glass lenses, the light beams emitted by the first condensing lens 41 form a telecentric optical path at the first dichroic mirror 21, the incident angles of any light beam emitted by the second lens array 32 on different positions of the first dichroic mirror 21 are the same, since the incident angle of the half-function wavelength of the spectrum is shorter as the optical incident angle is larger, and the uniformity of the white light of the system is affected by whether the incident angle of the light beam LY1 is equal to the incident angle of the light beam LY2, the incident angle of the light beam LY1 is equal to the incident angle of the light beam LY2 by arranging the two first condensing lenses 41, so that the difference of the color coordinates LG of the fourth color light formed after splitting the second color light is small, the uniformity of the monochromatic fields of the third color light LR and the fourth color light LG is ensured, so that the color of the white light transmitted by the projector 100 is more uniform.

When the first condenser lens 41 is a biconvex lens, the spherical image side can be reduced. In addition, the curvatures of the incident surface and the exit surface of the first condenser lens 41 may be the same or different, and may be specifically adjusted according to actual requirements. In some embodiments, the two first condensing lenses 41 are bonded to each other to form an adhesive body, so as to reduce the interval between the two first condensing lenses 41. The two first condensing lenses 41 are provided to further condense the incident light beams, thereby increasing the light intensity.

In the present embodiment, the projector 100 further includes a second condenser lens 42, the number of the second condenser lenses 42 may be 1, 2 or more, as an example, at least two second condenser lenses 42 are disposed between the reflection mirror and the first dichroic mirror 21, the two second condenser lenses 42 may be biconvex mirrors or monoconvex mirrors, wherein the incident surfaces of the two second condenser lenses 42 may be aspheric surfaces or spherical surfaces, and the second condenser lenses 42 may be low-refractive-index, low-dispersion glass lenses. By providing two second condenser lenses 42, the incident light beams can be more condensed, and the light intensity can be increased. The second color light LY can be more uniformized by the second condenser lens 42.

In this embodiment, the projector 100 further includes a third condenser lens 44, the number of the third condenser lenses 44 may be 1, 2 or more, and the third condenser lens 44 is disposed on the optical path of the third color light LR. The entrance surface of the third condenser lens 44 may be aspheric or spherical, and the third condenser lens 44 may be a low refractive index, low dispersion glass lens. By providing the third condenser lens 44, the incident light beam can be more condensed, and the light intensity can be increased. The third condenser lens 44 can further homogenize the third color light LR.

In some embodiments, the projector 100 further includes a fourth condensing lens 45 (as shown in fig. 2), the first lens array 31, the second lens array 32, and the fourth condensing lens 45 are sequentially disposed between the laser fluorescence light source 10 and the first dichroic mirror 21, an incident surface of the fourth condensing lens 45 may be an aspheric surface or a spherical surface, and the fourth condensing lens 45 may be a low refractive index, low dispersion glass lens. By providing the fourth condenser lens 45, the incident light beam can be more condensed, and the light intensity can be increased.

In some embodiments, the projector 100 may further include at least two relay lenses 43, and the two relay lenses 43 may be disposed on the optical path with the longest optical path length, as an example: the optical path length of the third color light LR is longer than the optical path lengths of the first color light LB, the second color light LY, and the fourth color light LG, and both the relay lenses 43 may be provided on the optical path of the third color light LR, thereby preventing a decrease in light use efficiency due to light diffusion or the like. Further, the number of the relay lenses 43 may be 1 or more.

Referring to fig. 2, in the present embodiment, the projector 100 further includes a polarization conversion system 33, the polarization conversion system 33 is disposed between the laser fluorescence light source 10 and the first dichroic mirror 21, and the polarization conversion system 33 is configured to convert the light beam emitted from the laser fluorescence light source 10 into polarized light. Specifically, the polarization conversion system 33 is disposed between the first lens array 31 and the first dichroic mirror 21. The polarization conversion system 33 has a function of adjusting the polarization direction of each partial beam divided by the first lens array 31 to a linearly polarized light in one direction. The polarization conversion system 33 includes polarization separation films and mirrors alternately arranged at predetermined intervals in a direction perpendicular to the emission light path LP of the laser fluorescent light source 10, in which the polarization separation films transmit one of the P-polarized light and the S-polarized light (for example, P-polarized light) included in each partial light beam and reflect the other of the P-polarized light and the S-polarized light (for example, S-polarized light), and the reflected other of the P-polarized light and the S-polarized light (for example, S-polarized light) is bent by the adjacent mirrors and emitted in the emission direction of the one of the P-polarized light (for example, P-polarized light), that is, along the emission light path LP of the laser fluorescent light source 10.

In the present embodiment, the projector 100 further includes a light modulation system 50, the light modulation system 50 includes a first modulation unit 51, a second modulation unit 52, and a third modulation unit 53, the first modulation unit 51 is disposed on the optical path of the first color light LB, the second modulation unit 52 is disposed on the optical path of the third color light LR, and the third modulation unit 53 is disposed on the optical path of the fourth color light LG. The first modulation unit 51, the second modulation unit 52, and the third modulation unit 53 are all Liquid Crystal Displays (LCDs), each of the first modulation unit 51, the second modulation unit 52, and the third modulation unit 53 includes a Liquid Crystal panel 54 and two polarization filters 55, and the Liquid Crystal panel 54 is located between the two polarization filters 55. In each liquid crystal panel 54, liquid crystal as an electro-optical material is sealed between a pair of transparent glass substrates, and for example, a polysilicon TFT is used as a switching element to modulate the polarization direction of polarized light incident thereto in accordance with a supplied image signal. The second condenser lens 42 is provided between the first dichroic mirror 21 and the first modulation unit 51, and the third condenser lens 44 is provided between the second dichroic mirror 22 and the third modulation unit 53.

Each liquid crystal panel 54 may be a non-light emitting and transmissive light modulation device for changing the spatial distribution of the polarization direction of incident color light. The respective color lights incident on the respective liquid crystal panels 54 are adjusted in polarization state on a pixel-by-pixel basis in accordance with a drive signal or a control signal input as an electric signal to the respective liquid crystal panels 54. At this time, the polarization direction of the illumination light incident on each liquid crystal panel 54 is adjusted by the polarization filter 55, and modulated light of a predetermined polarization direction is extracted from the light emitted from each liquid crystal panel 54 by the polarization filter 55.

In the present embodiment, the projector 100 further includes a light combining system 60, and the first color light LB, the third color light LR, and the fourth color light LG are respectively incident to the light combining system 60 and combined to form a color image. The light synthesizing system 60 includes a cross dichroic prism, and synthesizes a color image based on each modulated optical image of each color light emitted from the polarizing filter 55. The cross dichroic prism includes four right-angle prisms bonded to each other, and right-angle sides of two adjacent right-angle prisms are bonded to each other, and a pair of multilayer dielectric films 61, 62 crossing in an X-shape is formed at an interface between the bonded right-angle prisms. One of the multilayer dielectric films 61 reflects red light, and the other multilayer dielectric film 62 reflects blue light. The image light combined by the cross dichroic prism is projected as a color image on a screen (not shown) at an appropriate magnification through a projection lens for enlargement.

In some embodiments, the projector 100 further includes a reflective lens 70, and the reflective lens 70 may be disposed on a light path formed by the color lights to bend the light path. As an example: the reflection lens 70 may be disposed on the optical path of the third color light LR so as to bend the optical path of the third color light LR. For example, the two reflective lenses 70 may be disposed on the light path of the third color light LR at opposite intervals to reflect the light path of the third color light LR twice to bend the light path twice, and a certain included angle is formed between the reflective surfaces of the two reflective lenses 70, and the included angle may be smaller than or equal to 90 °. For example, when the included angle is 90 °, when the light beam of the third color light LR enters one of the reflective lenses at an incident angle of 45 ° and is reflected, and the formed light path is bent by 90 °, the reflected light beam exits the other reflective lens and is reflected again, and the formed light path is bent by 90 °. The reflection lens 70 may be disposed on an optical path formed by other color lights, and for example, the reflection lens 70 may be disposed on the optical path of the first color light LB to reflect and guide the first color light LB. The light path formed by the colored light can be bent and a predetermined light path can be formed by providing the reflection lens 70. The included angle formed between the reflecting surface of the reflecting lens and the incident direction of the colored light can be adjusted according to actual requirements, for example, the included angle formed between the reflecting surface of the reflecting lens and the incident direction of the colored light can be larger than 90 degrees.

The utility model provides a projector 100 falls on no light wave band W2 through the reflectance spectrum with first chromatic light LB for the drift of the reflectance spectrum of first chromatic light LB can not exert an influence to actual beam splitting result, has guaranteed the monochromatic field homogeneity of first chromatic light LB behind the beam splitting, makes the colour of the light beam that projector 100 throws out even more.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (16)

1. A projector, characterized by comprising:

the laser fluorescence light source is used for emitting light beams to form a discontinuous spectrum, the discontinuous spectrum comprises a first wave band and a second wave band which are mutually separated, and a lightless wave band is formed between the first wave band and the second wave band; and

the color separation optical system comprises a first dichroic mirror, the first dichroic mirror has set spectral characteristics, a transition spectral band between a reflection spectral band and a transmission spectral band in the spectral characteristics corresponds to the lightless band, and the first dichroic mirror separates a light beam emitted by the laser fluorescence light source into first color light and second color light through the spectral characteristics, wherein the first color light corresponds to the first wavelength band, and the second color light corresponds to the second wavelength band.

2. The projector as claimed in claim 1, wherein the wavelength range of the non-optical band is between 470nm and 490 nm.

3. The projector of claim 1 wherein the first color light is blue light.

4. The projector according to claim 1, further comprising a second dichroic mirror positioned in an optical path formed by the second color light for separating the second color light into third color light and fourth color light.

5. The projector as claimed in claim 4, wherein the third color light is red light, the fourth color light is green light, and the optical path length of the third color light is longer than that of the fourth color light.

6. The projector according to claim 4 or 5, further comprising a first condensing lens provided in an optical path formed by the second color light and located between the first dichroic mirror and the second dichroic mirror so that the second color light forms a telecentric optical path at the second dichroic mirror.

7. The projector according to claim 4, further comprising a light modulation system including a first modulation section provided on a light path formed by the first color light, a second modulation section provided on a light path formed by the third color light, and a third modulation section provided on a light path formed by the fourth color light.

8. The projector according to claim 7, further comprising a second condenser lens provided in an optical path formed by the first color light, the second condenser lens being provided between the first dichroic mirror and the first modulation section.

9. The projector according to claim 7, further comprising a third condenser lens provided in an optical path formed by the third color light, the third condenser lens being provided between the second dichroic mirror and the third modulation section.

10. The projector according to claim 4, further comprising at least two relay lenses, wherein the two relay lenses are disposed in an optical path formed by the third color light.

11. The projector according to claim 4, further comprising a first lens array, a second lens array and a fourth condensing lens, the first lens array, the second lens array and the fourth condensing lens being sequentially disposed between the laser fluorescence light source and the first dichroic mirror, the first lens array being configured to separate the light source light emitted from the laser fluorescence light source into a plurality of partial light beams; the second lens array is used for condensing the plurality of partial light beams.

12. The projector according to claim 7, wherein the first modulation section, the second modulation section, and the third modulation section are all liquid crystal displays.

13. The projector according to claim 12, further comprising a polarization conversion system provided between the laser fluorescence light source and the first dichroic mirror, the polarization conversion system being configured to convert the light beam emitted from the laser fluorescence light source into polarized light.

14. The projector according to claim 13, wherein each of the first modulation section, the second modulation section, and the third modulation section includes a liquid crystal panel and two polarization filters, the liquid crystal panel being located between the two polarization filters.

15. The projector according to claim 4, further comprising a reflective lens disposed in the optical path of the third color light to bend the optical path of the third color light.

16. The projector of claim 4 wherein the projector includes at least two relay lenses, each of the at least two relay lenses being disposed in an optical path formed by the third color light.

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