CN213423689U

CN213423689U - Lighting system

Info

Publication number: CN213423689U
Application number: CN202021216225.8U
Authority: CN
Inventors: 陈宗平; 王柏霖
Original assignee: Young Optics Inc
Current assignee: Young Optics Inc
Priority date: 2020-02-11
Filing date: 2020-06-28
Publication date: 2021-06-11
Anticipated expiration: 2030-06-28
Also published as: TWI809249B; TW202131056A; CN113253555B; CN113253555A

Abstract

A lighting system includes a first light source, a second light source, a third light source, a fourth light source, a first light splitting element, a second light splitting element, and a third light splitting element. The first light splitting element is arranged on the light path of the first light source and the second light source, the second light splitting element is arranged on the light path of the third light source, and the third light splitting element is arranged on the light path of the third light source and the fourth light source. The third light source and the fourth light source are red light sources with the wavelength within the range of 600 nanometers to 680 nanometers, and the wavelength peak value difference between the third light source and the fourth light source is between 10 nanometers and 50 nanometers.

Description

Lighting system

Technical Field

The utility model relates to an illumination system especially relates to an illumination system suitable for projector.

Background

With the development of solid-state lighting and projection technology in recent years, projection apparatuses mainly using solid-state lighting such as light-emitting diodes (LEDs) and laser diodes (laser diodes) have been gaining popularity in the market.

In a typical projector architecture, an illumination system is typically provided to provide illumination light. The illumination light passes through the light valve and then is converted into image light, and the image light can be projected on a screen or a wall surface after passing through the projection lens. The brightness of the image light output by the projector depends on the brightness of the illumination light provided by the illumination system. In the illumination system of a general projector, a blue light source can output blue light to excite green phosphor to generate green light. The above-mentioned green light and one red light output by the red light source and one blue light output by the blue light source together form the three primary colors (RGB) of the illumination light output by the illumination system. In a conventional projector structure, a blue light source is usually additionally disposed to provide blue light to the green phosphor through other light paths to enhance the intensity of the green light excited by the green phosphor, thereby increasing the brightness of the light output by the illumination system.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lighting system, the light of lighting system output has higher luminance and the colour gamut of preferred, and its component configuration is compact (compact).

The utility model discloses lighting system includes first light source, second light source, third light source, fourth light source. The illumination system further comprises a first light splitting element, a second light splitting element and a third light splitting element. The first light splitting element is arranged on the light path of the first light source and the second light source, the second light splitting element is arranged on the light path of the third light source, and the third light splitting element is arranged on the light path of the third light source and the fourth light source. The third light source and the fourth light source are red light sources with the wavelength within the range of 600 nm to 680 nm, and the peak value difference of the wavelengths of the third light source and the fourth light source is between 10 nm and 50 nm.

The utility model discloses lighting system includes first light emitting component, second light emitting component, third light emitting component, fourth light emitting component, first optics beam splitting element, second optics beam splitting element. The first optical light splitting element is arranged at the downstream of the optical paths of the first light emitting element and the second light emitting element, and the second optical light splitting element is arranged at the downstream of the optical paths of the third light emitting element and the fourth light emitting element, so that the light emitted by the third light emitting element can penetrate through the second optical light splitting element, and the light emitted by the fourth light emitting element can be reflected. Wherein, the light emitted by the third light-emitting element and the light emitted by the fourth light-emitting element are unpolarized light rays with the same color system.

In view of the above, in the related embodiments of the present invention, since the wavelength peak of the output spectrum of the illumination system is increased from 630nm to 680 nm, when the illumination system is applied to a projection apparatus, for example, the output spectrum of the projection apparatus has a higher brightness and a better color gamut. In addition, in the lighting system according to the related embodiment of the present invention, since the internal space of the lighting system is properly used to enhance the light output of the lighting system by additionally providing the deep red light source, the component configuration of the lighting system is compact, and the dead space thereof is reduced.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram illustrating an architecture of a projection apparatus.

Fig. 2 is a schematic view illustrating an architecture of a lighting system according to a first embodiment of the present invention.

Fig. 3 is a schematic view illustrating an architecture of a lighting system according to a second embodiment of the present invention.

Fig. 4 is a schematic view illustrating an architecture of a lighting system according to a third embodiment of the present invention.

Fig. 5 is a schematic view illustrating an architecture of a lighting system according to a fourth embodiment of the present invention.

Fig. 6 is a schematic diagram illustrating an architecture of a lighting system according to a fifth embodiment of the present invention.

Fig. 7 is a schematic view illustrating an architecture of a lighting system according to a sixth embodiment of the present invention.

Fig. 8 is a schematic view illustrating an architecture of a lighting system according to a seventh embodiment of the present invention.

FIG. 9 is a spectrum diagram of the first, second, third, fourth, and fifth excitation light according to various embodiments.

Fig. 10 is a spectrum diagram of the second light guide member, the third light guide member, the fourth light ray and the fifth light ray in the embodiment of fig. 5.

Detailed Description

The optical element of the present invention is formed by a partially or totally reflective or transmissive material, and generally includes glass or plastic. The lens of the present invention refers to an optical element that allows at least part of light to pass through and at least one of the light incident surface and the light emitting surface is not a plane, such as a flat glass, i.e. is not a lens. The light combining means that more than one light beam can be combined into one light beam for outputting. The light splitting of the present invention means that one light beam can be split into several light beams for output.

Fig. 1 is a schematic diagram of a projection apparatus, in which a projection apparatus 100 includes an illumination system 110, a light valve 120, a projection lens 130, and a light path adjusting mechanism 140. The illumination system 110 has a light source 112 adapted to provide an illumination beam 114, and a light valve 120 disposed on a transmission path of the illumination beam 114. The light valve 120 is adapted to convert the light beam 114 into an image beam 114 a. In addition, the projection lens 130 is disposed on the transmission path of the image beam 114a, and the light valve 120 is located between the illumination system 110 and the projection lens 130. The optical path adjusting mechanism 140 may be disposed between the light valve 120 and the projection lens 130, for example, between the light valve 120 and the tir prism 119 or between the tir prism 119 and the projection lens 130, and is located on the transmission path of the image beam 114 a. In the projection apparatus 100, the light source 112 may include, for example, a red light emitting diode 112R, a green light emitting diode 112G, and a blue light emitting diode 112B, color lights emitted by the light emitting diodes are combined by a light combining device 116 to form an illumination beam 114, and the illumination beam 114 sequentially passes through a light uniformizing element 117, such as a lens array (lens array) or a light integrating rod (light integrating rod), a lens set 118, and a total internal reflection Prism (TIR Prism) 119. The tir prism 119 then reflects the beam 114 to the light valve 120. At this time, the light valve 120 converts the light beam 114 into the image light beams 114a, and the image light beams 114a sequentially pass through the tir prism 119 and the optical path adjusting mechanism 140, and are projected onto the screen 150 through the projection lens 130.

Fig. 2 illustrates a lighting system 110a according to a first embodiment of the present invention. In the present embodiment, the first light source S1 may output a first light L1, the second light source S2 may output a second light L2, the third light source S3 may output a third light L3, the fourth light source S4 may output a fourth light L4, and the fifth light source S5 may output a fifth light L5. The first light source S1, the second light source S2, the third light source S3, the fourth light source S4, and the fifth light source S5 each include, for example, a Laser Diode (LD) chip, a light-emitting diode (LED) chip, or any of the packages thereof, which can emit various visible lights. In the present embodiment, the first light source S1, the second light source S2 and the third light source S3 include a blue light emitting diode (blue) chip, and the color of the first light L1, the second light L2 and the third light L3 is substantially blue. The fourth light source S4 includes a red light emitting diode (red) chip, the fifth light source S5 includes a deep red light emitting diode (deep red) chip, the color of the fourth light L4 is substantially red, and the color of the fifth light L5 is substantially deep red. The difference between the peak wavelength of the fourth light and the peak wavelength of the fifth light is between 10 nm and 50 nm, and the colors of the fourth light and the fifth light belong to the red color system in the broad sense.

In addition, the wavelength conversion element P1 is located downstream in the optical path of the first light source S1 and the second light source S2, and P1 means an optical element including at least one phosphor. More specifically, the wavelength conversion element P1 is a transparent colloid, a fluorescent wheel, a fluorescent sheet, or other optical elements including fluorescent powder and having wavelength conversion function, such as a Laser Diode (LD) chip, a light-emitting diode (LED) chip, or any of the above packages, which has fluorescent powder and can emit various visible lights. In the present embodiment, the wavelength converting element P1 is disposed on the optical path downstream of the first light source S1 and the second light source S2, that is, the wavelength converting element P1 is disposed on the transmission path of the first light L1 and the second light L2. The wavelength conversion element P1 can receive light and convert the light to generate excitation light by Photoluminescence (Photoluminescence) phenomenon. Specifically, the wavelength conversion element P1 may receive blue light of the first light L1 and generate green light of the first excitation light (Pump light) PL1, and may receive blue light of the second light L2 and generate green light of the second excitation light PL2, for example. The first excitation light PL1 and the second excitation light PL2 have spectra respectively, the wavelength peaks of the spectra are between 490 nanometers and 590 nanometers respectively, and the difference between the wavelength peaks of the spectra is less than 10 nanometers. More specifically, the first excitation light PL1 and the second excitation light PL2 have a corresponding spectral energy distribution curve in a spectral energy distribution diagram, and the peak of the distribution curve falls within the wavelength interval of green (e.g. between 490 nm and 590 nm).

Furthermore, the first light guide G1a, the second light guide G2a, and the third light guide G3a of the present invention are a beam splitter, a polarizer, a light filter, an X-type plate, a reflector, a lens, a plate glass, a prism, an integration rod, a light guide rod, or a combination of at least one of the foregoing. In detail, the spectroscopic plate refers to an optical element having a spectroscopic function, such as a half mirror, a polarizing plate for splitting light with P, S polarity, various wave plates, various prisms for splitting light at an incident angle, a spectroscopic plate for splitting light with a wavelength, and the like. Specifically, in the present embodiment, the first light guide G1a, the second light guide G2a, and the third light guide G3a have wavelength selectivity, and are dichroic filters, such as Dichroic Mirrors (DM), which use wavelength (color) for light splitting. In a related embodiment, the first light guide G1a, the second light guide G2a, and the third light guide G3a may be independent devices, optical elements with color separation function, or color separation films or coatings plated on other components, which is not limited by the present invention. In the embodiment, the first light guide G1a allows blue light L1 and L3 to reflect and allows green light PL1 and PL2 to penetrate, the second light guide G2a allows red light L4 to reflect and allows other colors of light to penetrate, and the third light guide G3a allows deep red light L5 to reflect and allows other colors of light to penetrate. In the present embodiment, the third light L3, the fourth light L4, the fifth light L5, the first excitation light PL1 and the second excitation light PL2 are output through the second light guide G2a and the third light guide G3a, respectively, to form the illumination light 114.

In detail, the illumination system 110a may further include a light uniformizing element 117 disposed on the transmission path of the illumination light for uniformizing the intensity distribution of the illumination light. Specifically, the light uniformizing element 117 may be an optical element such as Fly-eye lens (Fly-eye lens) or light integrating column (light integrating rod), but the present invention is not limited thereto. In another embodiment, the light uniformizing element 117 may not be included. The illumination system 110a may further include other optical elements such as a lens, a diffuser, a reflector, a prism, etc. according to the actual requirement, the invention is not limited thereto.

The light valve 120 of the present invention includes a plurality of individual cells spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical signals or electric signals, and various physical effects (such as Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, electro-optic effect of semiconductor, and photorefractive effect) are utilized to change the optical characteristics of the unit, so that the illuminating light illuminating the independent units is modulated, and image light is output. The independent unit is an optical element such as a micro-reflector, a liquid crystal unit and the like. In detail, the light valve 120 of the present invention is a digital micro-mirror device (DMD), a Liquid Crystal On Silicon (LCOS) panel or a transmissive liquid crystal panel. In this embodiment, the light valve is a digital micromirror device, however, in other embodiments, the light valve 120 may also be a transmissive liquid crystal panel or other spatial light modulator, which is not limited by the present invention.

In addition, the projection lens 130 is composed of at least one lens. The projection lens 130 may be provided with an aperture stop or optical path, and the aperture stop is provided with at least one lens in front of and behind the aperture stop to adjust the shape and aberration of the image light.

The following exemplarily illustrates the arrangement of the components and the light transmission process of the illumination system 110a of the first embodiment in fig. 2. In the present embodiment, the first light source S1 outputs the first blue light L1, which is reflected by the first light guide G1a to reach the wavelength conversion element P1, and excites the first excitation light PL1 converted into green. The second light source S2 outputs the second light L2 of blue, and the second light L2 of blue reaches the wavelength converting element P1 and excites the second excitation light PL2 converted into green. The first light guide G1a is inclined with respect to the first light source S1, such that the incident angle of the first light L1 to the first light guide G1a is, for example, about 45 degrees. Specifically, when the first excitation light PL1 and the second excitation light PL2 of green color leave the wavelength conversion element P1 by reflection and/or penetration, penetrate through the first light guide G1a, reach the second light guide G2a and the third light guide G3a, and penetrate through them, the second light guide G2a is substantially parallel to the first light guide G1a, and the third light guide G3a is substantially perpendicular to the second light guide G2 a. In addition, the third light source S3 outputs the blue third light L3, and the third light L3 is reflected by the first light guide G1a to reach the second light guide G2a and the third light guide G3a and penetrate through the light guide. The fourth light source S4 outputs a red fourth light L4, the fourth light L4 is reflected by the second light guide G2a to reach the third light guide G3a and penetrate through the third light guide, the fifth light source S5 outputs a deep red fifth light L5, and the fifth light L5 is reflected by the third light guide G3a to reach the second light guide G2a and penetrate through the second light guide G3 a.

In the present embodiment, the first excitation light PL1, the second excitation light PL2, and the third light L3 penetrating through the second light guide G2a and the third light guide G3a, the fifth light L5 penetrating through the second light guide G2a, and the fourth light L4 penetrating through the third light guide G3a are combined into the illumination light 114 and output from the illumination system 110. In detail, the color of the third light L3 is, for example, blue, the colors of the fourth light L4 and the fifth light L5 are, for example, red and deep red, and the colors of the first excitation light PL1 and the second excitation light PL2 are, for example, green. Therefore, the first excitation light PL1, the second excitation light PL2, the third light L3, the fourth light L4 and the fifth light L5 can provide the three primary colors (RGB) of the illumination light. In the present embodiment, the illumination light 114 is transmitted to the light valve 120, and the light valve 120 is used for converting the illumination light 114 into the image beam 114 a. In addition, the projection lens 130 is used for projecting the image beam 114a onto an imaging plane or a screen 150 to form an image frame.

Please refer to fig. 9, which is a spectrum diagram of each of the above-mentioned light sources. The blue light (L1, L2, L3) refers to light having a spectrum with a peak wavelength of 400 nm to 460 nm. The green excitation light (PL1, PL2) refers to light having a spectrum with a peak wavelength between 490 nm and 590 nm. The red light (L4) refers to a light spectrum with a wavelength peak between 600 nm and 630 nm. The deep red light (L5) refers to a light spectrum with a peak wavelength between 630nm and 680 nm. Therefore, the light (deep red light) with the peak wavelength of the spectrum output by the illumination system 110 between 630nm and 680 nm is increased, so that the light output by the projection apparatus 100 has higher brightness and better color gamut. Wherein, the brightness can be improved by about 12-17%, and the color gamut can be improved by about 4%.

It is to be noted that, although the blue light emitted from the first light source and the second light source is used to deactivate the wavelength conversion element, the first excitation light and the second excitation light are converted into green. However, only the blue light of one light source may be used to deactivate the wavelength conversion element, and at this time, the illumination system may output the three primary colors (RGB) of the illumination light only using four light sources, wherein the peak wavelength value of the third light source is between 600 nm and 630nm, and the peak wavelength value of the fourth light source is between 630nm and 680 nm; the peak wavelength value of the light emitted by the third light-emitting element is between 630 nanometers and 680 nanometers, and the peak wavelength value of the light emitted by the fourth light-emitting element is between 600 nanometers and 630 nanometers. In another embodiment, blue light emitted from the first light source and the second light source may be used to deactivate the wavelength conversion element and convert the blue light into red first excitation light and red second excitation light, wherein the color of the fourth light L4 is substantially green, and the color of the fifth light L5 is substantially dark green. The difference between the peak wavelength of the fourth light and the peak wavelength of the fifth light is between 10 nm and 50 nm, and the colors of the fourth light and the fifth light belong to the green color system in the broad sense. Furthermore, in another embodiment, the red light and the deep red light are unpolarized light.

Please refer to fig. 3 for explaining an illumination system 110b according to a second embodiment of the present invention. In the present embodiment, the illumination system 110b is similar to the illumination system 100a of the embodiment of fig. 2, and the main differences are as follows. In the present embodiment, the first excitation light PL1 and the second excitation light PL2 of green and the third light L3 of blue reach the second light guide G2b through the first light guide G1b and penetrate through them. The fourth red light L4 penetrates through the third light guide G3b to reach the second light guide G2b and is reflected by the second light guide G2b, and the fifth dark red light L5 is reflected by the third light guide G3b to reach the second light guide G2b and is reflected by the second light guide G2 b. Thereby, the first excitation light PL1, the second excitation light PL2, and the third light L3 penetrating through the second light guide G2b, and the fourth light L4 and the fifth light L5 reflected by the second light guide G2b are combined into the illumination light 114 and output from the illumination system 110 b.

Please refer to fig. 4 for a description of an illumination system 110c according to a third embodiment of the present invention. In the present embodiment, the illumination system 110c is similar to the illumination system 100a of the embodiment of fig. 2, and the main differences are as follows. In the present embodiment, the first excitation light PL1 and the second excitation light PL2 of green and the third light L3 of blue penetrate the second light guide G2c and the third light guide G3c through the first light guide G1 c. The red fourth light L4 reaches the third light guide G3c by being reflected by the second light guide G2c, and penetrates through the third light guide G3c, and the dark red fifth light L5 is reflected by the third light guide G3 c. Thereby, the first excitation light PL1, the second excitation light PL2, the third light L3, the fourth light L4 penetrating through the third light guide G3c and the fifth light L5 reflected by the third light guide G3c are combined into the illumination light 114 and output from the illumination system 110 c.

Please refer to fig. 5 for explaining an illumination system 110d according to a fourth embodiment of the present invention. In the present embodiment, the illumination system 110d is similar to the illumination system 100a of the embodiment of fig. 2, and the main differences are as follows. In the present embodiment, the first excitation light PL1 and the second excitation light PL2 of green and the third light L3 of blue sequentially pass through the second light guide G2d, the first lens array 117a and are reflected by the third light guide G3d via the first light guide G1 d. The fourth red light L4 is reflected by the second light guide G2d, then penetrates through the first lens array 117a and is reflected by the third light guide G3d, and the fifth dark red light L5 penetrates through the second lens array 117b and the third light guide G3 d. Thereby, the fifth light L5 penetrating through the third light guide G3d and the first excitation light PL1, the second excitation light PL2, the third light L3 and the fourth light L4 reflected by the third light guide G3d are combined into the illumination light 114 and output from the illumination system 110 d.

In addition, please refer to fig. 10 for further description of the second light guide G2d, the third light guide G3d, the fourth light L4 and the fifth light L5 of the present embodiment. The second light guide G2d is a wavelength-splitting beam splitter that allows visible light with a wavelength of about 570nm or less to pass through, but blocks visible light with a wavelength of about 590nm or more. The third light guide G3d is also a beam splitter that uses wavelength splitting, but it blocks visible light with wavelengths below about 620nm, but highly transmits visible light with wavelengths above about 630 nm. Therefore, by using the characteristics of the second light guide G2d and the third light guide G3d, the fourth red light L4 can be blocked by the second light guide G2d and the third light guide G3d and reflected, but the fifth dark red light L5 penetrates through the third light guide G3 d. The present invention provides a light guide member, which can be used by a person skilled in the art to change the design of a coating film to achieve the function of penetrating or blocking any light.

Please refer to fig. 6 for a description of an illumination system 110e according to a fifth embodiment of the present invention. In the present embodiment, the illumination system 110e is similar to the illumination system 100a of the embodiment of fig. 2, and the main differences are as follows. In the present embodiment, the first excitation light PL1 and the second excitation light PL2 of green light reach the second light guide G2e through the first light guide G1e and penetrate through the first light guide. The blue third light L3 is reflected by the second light guide G2 e. The red fourth light L4 penetrates through the third light guide G3e to reach the first light guide G1e, and is reflected by the first light guide G1e to reach the second light guide G2e and penetrate through it. The dark red fifth light L5 is reflected by the third light guide G3e to reach the first light guide G1e, and is reflected by the first light guide G1e to reach the second light guide G2e and penetrate through the second light guide G2 e. Thereby, the first excitation light PL1, the second excitation light PL2, the fourth light L4, the fifth light L5 penetrating through the second light guide G2e and the third light L3 reflected by the second light guide G2e are combined into the illumination light 114 and output from the illumination system 110 e.

Please refer to fig. 7 for a sixth embodiment of an illumination system 110f of the present invention. In the present embodiment, the first light source S1 outputs the blue first light L1, penetrates the first light guide G1f to reach the wavelength conversion element P1, and excites the first excitation light PL1 converted into green. The second light source S2 outputs the second light L2 of blue, and the second light L2 of blue reaches the wavelength converting element P1 and excites the second excitation light PL2 converted into green. The first light guide G1f is inclined with respect to the first light source S1, such that the incident angle of the first light L1 to the first light guide G1f is, for example, about 45 degrees. Specifically, when the green first excitation light PL1 and the green second excitation light PL2 leave the wavelength conversion element P1 by reflection and/or transmission, they are reflected by the first light guide G1 f. The blue third light L3 is reflected by the second light guide G2f and penetrates through the third light guide G3f and the first light guide G1 f. The fourth red light L4 penetrates through the second light guide G2f, the third light guide G3f and the first light guide G1 f. The deep red fifth light L5 is reflected by the third light guide G3f and penetrates through the second light guide G2f and the first light guide G1 f. Thereby, the third light L3, the fourth light L4 and the fifth light L5 penetrating through the first light guide G1f and the first excitation light PL1 and the second excitation light PL2 reflected by the first light guide G1f are combined into the illumination light 114 and output from the illumination system 110 f.

Please refer to fig. 8 for a lighting system 110g according to a seventh embodiment of the present invention. In the present embodiment, the illumination system 110g is similar to the illumination system 100a of the embodiment of fig. 2, with the main differences as described below. In the present embodiment, the first excitation light PL1 and the second excitation light PL2 of green color penetrate the first light guide G1G. The blue third light L3 penetrates through the second light guide G2G and the third light guide G3G, and is reflected by the first light guide G1G. The red fourth light L4 is reflected by the second light guide G2G, penetrates the third light guide G3G to reach the first light guide G1G, and is reflected by the first light guide G1G. The dark red fifth light L5 is reflected by the third light guide G3G, penetrates through the second light guide G2G, reaches the first light guide G1G, and is reflected by the first light guide G1G. Thereby, the first excitation light PL1, the second excitation light PL2 penetrating through the first light guide G1G, and the third light L3, the fourth light L4, and the fifth light L5 reflected by the first light guide G1G are combined into the illumination light 114 and output from the illumination system 110G.

The light source of the present invention is an optical element capable of generating light. More specifically, the optical device capable of generating light is a light emitting diode chip, a laser diode chip, a module packaged by the aforementioned chips, or other devices or combinations thereof capable of achieving the same effect.

In summary, in the related embodiments of the present invention, since the wavelength peak of the spectrum output by the illumination system 110 is increased between 630nm and 680 nm, when the illumination system is applied to a projection apparatus, for example, the light output by the projection apparatus has a higher brightness and a better color gamut. In addition, in the lighting system according to the related embodiment of the present invention, since the internal space of the lighting system is properly used to enhance the light output of the lighting system by additionally providing the deep red light source, the component configuration of the lighting system is compact, and the dead space thereof is reduced.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make many modifications or equivalent variations by using the above disclosed method and technical contents without departing from the technical scope of the present invention, but all the simple modifications, equivalent variations and modifications made by the technical spirit of the present invention to the above embodiments are within the scope of the technical solution of the present invention.

Claims

1. An illumination system, comprising:

a first light source;

a second light source;

a third light source;

a fourth light source;

the first light splitting element is arranged on the light path of the first light source and the second light source;

the second light splitting element is arranged on the light path of the third light source; and

a third light splitting element arranged on the light path of the third light source and the fourth light source,

the third light source and the fourth light source are red light sources with the wavelength within the range of 600 nanometers to 680 nanometers, and the peak value difference of the wavelengths of the third light source and the fourth light source is between 10 nanometers and 50 nanometers.

2. The illumination system of claim 1, wherein the second light splitting element and the third light splitting element are combined into an X shape.

3. The illumination system of claim 1, wherein the illumination system satisfies one of the following conditions: (1) the light source further comprises a first lens array and a second lens array, wherein the first lens array is positioned between the second light splitting element and the third light splitting element, the second lens array is positioned between the fourth light source and the third light splitting element, and (2) the lens array is not included.

4. The illumination system of claim 1, wherein the third light source has a peak wavelength between 600 nm and 630nm and the fourth light source has a peak wavelength between 630nm and 680 nm.

5. An illumination system as set forth in any one of claims 1 through 4, applicable to a projector.

6. An illumination system, comprising:

a first light emitting element;

a second light emitting element;

a third light emitting element;

a fourth light emitting element;

the first optical light splitting element is arranged on the downstream of the optical paths of the first light emitting element and the second light emitting element; and

a second optical splitting element, disposed downstream of the third light-emitting element and the fourth light-emitting element in the optical path, for allowing unpolarized light emitted by the third light-emitting element to pass through and allowing unpolarized light emitted by the fourth light-emitting element to be reflected,

the unpolarized light rays emitted by the third light-emitting element and the unpolarized light rays emitted by the fourth light-emitting element are light rays with the same color system.

7. The illumination system of claim 6, wherein the unpolarized light emitted by the third light-emitting element and the unpolarized light emitted by the fourth light-emitting element have spectra with peak wavelength differences between 10 nm and 50 nm.

8. The illumination system of claim 6, wherein the third light-emitting element emits light with a peak wavelength between 630nm and 680 nm, and the fourth light-emitting element emits light with a peak wavelength between 600 nm and 630 nm.

9. The illumination system of claim 6, wherein the illumination system satisfies one of the following conditions: (1) the light source further comprises a first lens array and a second lens array, wherein the first lens array is located between the first optical light splitting element and the second optical light splitting element, the second lens array is located between the third light emitting element and the second optical light splitting element, and (2) the light source does not comprise the lens arrays.

10. An illumination system as set forth in any one of claims 6 through 9, applicable to a projector.