CN113406850B - Projection system - Google Patents
Projection system Download PDFInfo
- Publication number
- CN113406850B CN113406850B CN202110729252.8A CN202110729252A CN113406850B CN 113406850 B CN113406850 B CN 113406850B CN 202110729252 A CN202110729252 A CN 202110729252A CN 113406850 B CN113406850 B CN 113406850B
- Authority
- CN
- China
- Prior art keywords
- light
- light source
- source
- combining mirror
- green
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention discloses a projection system, at least comprising: the light source comprises a first light source, a second light source, a third light source, a fourth light source, a fifth light source, a first light combiner and a second light combiner; the first light source is used for emitting light rays of a first wave band, the second light source is used for emitting light rays of a second wave band, the third light source is used for emitting light rays of a third wave band, and the fourth light source is used for irradiating and exciting the second light source so as to increase the stimulated emission times of the fluorescent powder layer in the second light source and improve the total intensity of fluorescent light in the light source; the fifth light source is used for irradiating and exciting the third light source so as to increase the stimulated emission times of the fluorescent powder layer in the third light source and improve the total intensity of the fluorescent light in the light source. And finally, the first light combining lens combines emergent light of the first light source and the second light source and then emits the combined light to the second light combining lens, and the second light combining lens combines emergent light of the first light combining lens and emergent light of the third light source and then emits the combined light to form white light, so that the output brightness of the light source is improved, and the display effect of the projection system is optimized.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to a projection system.
Background
The projection display is a method or an apparatus for controlling a light source by plane image information, enlarging and displaying an image on a projection screen using an optical system and a projection space. With the development of projection display technology, projection display is gradually applied to the fields of business activities, conference exhibition, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment and the like, and the advantages of large display screen size, clear display and the like are also suitable for the requirement of large-screen display.
However, some projection light sources in the related art have low brightness and cannot satisfy the display of large-size pictures.
Disclosure of Invention
In some embodiments of the invention, a projection system comprises: five light sources and two light-combining mirrors. The first light source is used for emitting light of a first wave band, the second light source is used for emitting light of a second wave band, the third light source is used for emitting light of a third wave band, the fourth light source is used for irradiating and exciting the second light source so as to increase stimulated emission times of the fluorescent powder layer in the second light source, and the fifth light source is used for irradiating and exciting the third light source so as to increase stimulated emission times of the fluorescent powder layer in the third light source and improve total intensity of fluorescence in the light sources. And finally, the first light combining lens combines emergent light of the first light source and the second light source and then emits the combined light to the second light combining lens, and the second light combining lens combines emergent light of the first light combining lens and emergent light of the third light source and then emits the combined light to form white light, so that the output brightness of the light source is improved, and the display effect of the projection system is optimized.
In some embodiments of the present invention, the second light source and the third light source are disposed in parallel, the fourth light source and the fifth light source are disposed in parallel, and the light emitting directions of the first light source and the other four light sources are perpendicular to each other. The first light combining mirror is positioned between the second light source and the fourth light source and forms an angle of 45 degrees with the light outgoing directions of the second light source and the fourth light source; the second light combining mirror is positioned between the third light source and the fifth light source and forms an angle of 45 degrees with the light outgoing directions of the third light source and the fifth light source. The reflected light and the transmitted light of the light combination component form an included angle of 90 degrees, and then the light rays are parallel to each other when finally emitted by the second light combination mirror.
In some embodiments of the present invention, the first light source, the fourth light source and the fifth light source are configured to emit blue light.
In some embodiments of the present invention, the first light source, the fourth light source, and the fifth light source may each employ a blue light emitting diode or a blue laser.
In some embodiments of the present invention, the second light source and the third light source are both light emitting diodes, and both include a light emitting chip emitting blue light, the second light source includes a first phosphor layer, the third light source includes a second phosphor layer, and the phosphor layers in the light sources are excited by the blue light to emit different colors of fluorescence.
In some embodiments of the present invention, the second light source is a yellow light emitting diode, and the third light source is a green light emitting diode; the first fluorescent powder layer is a yellow fluorescent powder layer; the second fluorescent powder layer is a green fluorescent powder layer; the light combination component also comprises a third light combination mirror positioned between the fifth light source and the second light combination mirror, and the first light combination mirror is used for transmitting blue light and reflecting yellow light; the second light combining mirror is used for transmitting blue light and red light and reflecting green light; the third light combining mirror is used for transmitting blue light and reflecting green light. Because the yellow light wave band contains the green light wave band, after the yellow light reaches the second light combining mirror, the green light in the yellow light wave band is reflected by the second light combining mirror, the reflected green light is incident to the third light combining mirror and then reflected back to the second light combining mirror, and then reflected back to the first light combining mirror by the second light combining mirror, finally the green light is reflected back to the yellow fluorescent powder layer by the first light combining mirror, the yellow fluorescent powder layer is re-excited to generate yellow light, and the steps are repeated. The reflected green light can thus be used continuously for re-exciting the yellow phosphor layer, so that the total intensity of the stimulated emission of yellow light can be increased.
In some embodiments of the present invention, the second light source is a green light emitting diode, and the third light source is a red light emitting diode; the first fluorescent powder layer is a green fluorescent powder layer; the second fluorescent powder layer is a red fluorescent powder layer; the first light combining mirror is used for transmitting blue light and reflecting green light; the second combiner is for transmitting blue and green light and reflecting red light.
In some embodiments of the present invention, the second light source is a red light emitting diode, and the third light source is a green light emitting diode; the first fluorescent powder layer is a red fluorescent powder layer; the second fluorescent powder layer is a green fluorescent powder layer; the first light combining mirror is used for transmitting blue light and reflecting red light; the second combiner is for transmitting blue and red light and reflecting green light.
In some embodiments of the present invention, the second light source is a green light emitting diode, and the third light source is a yellow light emitting diode; the first fluorescent powder layer is a green fluorescent powder layer; the second fluorescent powder layer is a yellow fluorescent powder layer; the first light combining mirror is used for transmitting blue light and reflecting green light; the second combiner is for transmitting blue and green light and reflecting red light. The excitation efficiency of the yellow fluorescent powder layer is higher than that of the red fluorescent powder layer, so that the yellow fluorescent powder layer is adopted to replace the red fluorescent powder layer, the yellow fluorescent powder layer is excited by the light source to generate yellow light, and then red light is extracted from the yellow light by the second light combining mirror to be reflected, so that the brightness of red light and green light in three-color light is improved, the proper brightness ratio of three-primary-color light is achieved, and the display effect of the projection system is improved.
In some embodiments of the present invention, the wavelength of the light emitted by the excited red phosphor layer is 600-680 nm.
In some embodiments of the present invention, the wavelength of the light emitted by the green phosphor layer is 500-570 nm.
In some embodiments of the present invention, the wavelength of the light emitted by the excited yellow phosphor layer is 500-680 nm.
In some embodiments of the invention, the projection system further comprises: the device comprises a light homogenizing component, an imaging lens group, an illumination light path, a light valve modulation component and a projection lens; the light valve modulation component can be a digital micro-mirror device, and the light emitted by the second light combining mirror is incident to the illumination light path through the dodging of the dodging component and the convergence of the imaging lens group. After passing through the illumination light path, the light beam conforms to the illumination size and incident angle required by the digital micromirror device. The reflected light is made to enter the projection lens by controlling the deflection angle of the digital micro-mirror device, and is used for projection imaging after being imaged by the projection lens.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a projection light source according to the prior art;
fig. 2 is a schematic structural diagram of a projection light source according to an embodiment of the present invention;
FIG. 3 is a second schematic view of a projection light source according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a projection light source according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a projection system according to an embodiment of the present invention.
The light source system comprises 11-a first light source, 12-a second light source, 13-a third light source, 14-a fourth light source, 15-a fifth light source, 21-a first light combining lens, 22-a second light combining lens, 23-a third light combining lens, 31-a first fluorescent powder layer, 32-a second fluorescent powder layer, 40-a light homogenizing part, 50-an imaging lens group, 60-an illumination light path, 70-a light valve modulating part and 80-a projection lens.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described in conjunction with the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
The projection display is a method or an apparatus for controlling a light source by plane image information, enlarging and displaying an image on a projection screen using an optical system and a projection space. With the development of projection display technology, projection display is gradually applied to the fields of business activities, conference exhibition, scientific education, military command, traffic management, centralized monitoring, advertising entertainment and the like, and the advantages of large display picture size, clear display and the like are also suitable for the requirement of large-screen display.
A commonly used projection system is a Digital Light Processing (DLP) architecture, and a Digital micro mirror Device (DMD) is used as a core Device, and Light emitted from a projection Light source is incident on the DMD to generate an image, and then the Light emitted from the image generated by the DMD is incident on a projection lens, is imaged by the projection lens, and is finally received by a projection screen.
Fig. 1 is a schematic structural diagram of a projection light source in the prior art.
As shown in fig. 1, a three-channel light source (including three light sources) is provided for emitting three primary lights, and the three primary lights are mixed to form white light and emit the white light. The three light sources are a first light source 11, a second light source 12 and a third light source 13; the first light source 11 emits blue light, the second light source 12 emits green light, and the third light source 13 emits red light. The blue light emitted from the first light source 11 and the green light emitted from the second light source 12 are combined by the first light combining mirror 21 and then are incident on the second light combining mirror 22, and the light emitted from the first light combining mirror 21 and the red light emitted from the third light source 13 are combined by the second light combining mirror 22 and then are mixed into white light to be emitted.
The primary light emitted by the second light source 12 and the third light source 13 is generally emitted by LED, and the brightness improvement by adopting the three-channel light source is subject to a bottleneck, which affects the effect of projection display. On the other hand, the red light LED has low luminous efficiency due to the limitation of the light emitting principle, and in order to ensure the display requirement, a red light supplement light source is generally required to be added, which may cause the increase of the light source volume, and is not beneficial to the application in the micro-projection field.
In view of this, the projection system provided in the embodiment of the present invention improves the projection light source, and is used to increase the output brightness of the projection light source and optimize the display effect of the projection system.
Fig. 2 is a schematic structural diagram of a projection light source according to an embodiment of the present invention.
As shown in fig. 2, the projection light source provided in the embodiment of the present invention includes five light sources and a light combining assembly.
The five light sources are respectively: a first light source 11, a second light source 12, a third light source 13, a fourth light source 14, and a fifth light source 15; the second light source 12 and the third light source 13 are arranged in parallel, the fourth light source and the fifth light source 15 are arranged in parallel, the fourth light source 14 and the second light source 12 are arranged oppositely, and the fifth light source 15 and the third light source 13 are arranged oppositely.
The light combining component comprises: the first light combining mirror 21 and the second light combining mirror 22 are arranged in parallel; the first light combining mirror 21 is located at the intersection of the outgoing lights of the first light source 11 and the second light source 12, and is used for emitting the outgoing light combining of the first light source 11 and the second light source 12 to the second light combining mirror 22; the second light combining mirror 22 is located at the intersection of the emergent light of the first light combining mirror 21 and the emergent light of the third light source 13, and is used for combining the emergent light of the first light combining mirror 21 and the emergent light of the third light source 13 to emit light.
As shown in fig. 2, the plane of the first light combining mirror 21 and the light emitting directions of the first light source 11 and the second light source 12 form a set included angle; the plane of the second light combining mirror 22 and the light emitting direction of the third light source 13 form a set included angle.
In practical implementation, the light emitting directions of the first light source 11 and the second light source 12 are perpendicular to each other, and the light emitting directions of the second light source and the third light source 13 are parallel to each other. An included angle between the plane of the first light combining mirror 21 and the light emitting directions of the first light source 11 and the second light source 12 can be set to be 45 degrees; the included angle between the plane of the second light combining mirror 22 and the light emitting direction of the third light source is set to be 45 degrees. Therefore, included angles between the first light combining mirror 21 and the second light combining mirror 22 and the light emitting direction of any one light source are 45 degrees, the reflected light and the transmitted light of the light combining mirrors form an included angle of 90 degrees, and finally the light emitted by the second light combining mirror 22 is parallel to each other.
The light emitted from the first light source 11 covers the first wavelength band, the light emitted from the second light source 12 covers the second wavelength band, and the light emitted from the third light source 13 covers the third wavelength band. The light of the first, second and third wavelength bands may correspond to different colors, for example, the light of the three primary colors may be respectively matched.
The first light combining mirror 21 is used for transmitting the light ray of the first wave band and reflecting the light ray of the second wave band; the second beam combiner 22 is configured to transmit the light of the first wavelength band and the light of the second wavelength band and reflect the light of the third wavelength band. Therefore, the light emitted from the second light combining mirror 22 finally covers the light of the first wavelength band, the light of the second wavelength band and the light of the third wavelength band, and the light of the three wavelength bands is mixed into white light to be emitted.
In the embodiment of the present invention, the first light source 11 may be configured to emit blue light, and specifically, a blue light emitting diode or a blue laser may be adopted. The second light source 12 and the third light source 13 convert the light of the second wavelength band and the light of the third wavelength band to be emitted by adopting a blue light chip to excite the fluorescent powder, and the luminance same as that of the blue light cannot be achieved due to the limitation of the conversion efficiency of the fluorescent powder. Therefore, two sets of excitation light sources are arranged oppositely in the projection light source, specifically, when the fourth light source 14 irradiates the second light source 13, the phosphors in the second light source 13 can be excited to emit again, and when the fifth light source 15 irradiates the third light source 13, the phosphors in the third light source 13 can be excited to emit again. Therefore, the times of exciting the fluorescent powder are increased, and the stimulated emission light of the fluorescent powder is multiplied, so that the total intensity of the stimulated emission fluorescent light is increased, the output brightness of the light source is improved, and the display effect of the projection system is optimized.
The fluorescent powder in the second light source 12 is excited by the light emitting chip in the second light source and the fourth light source 14, and the fluorescent powder in the third light source 13 is excited by the light emitting chip in the third light source and the fifth light source 15, so that the excited frequency of the fluorescent powder is increased, the excited emitted light of the fluorescent powder is multiplied, the output brightness of the fluorescent light in the emergent light of the light sources is improved, and the display effect of the projection system is optimized.
As shown in fig. 2, the second light source 12 includes light emitting chips and a first phosphor layer 31 on the light emitting sides of the light emitting chips, and the third light source 13 includes light emitting chips and a second phosphor layer 32 on the light emitting sides of the light emitting chips.
In specific implementation, the light emitting chips in the second light source 12 and the third light source 13 may be blue light emitting chips. The first phosphor layer 31 emits fluorescence of a second wavelength band under excitation of the blue light emitting chip, and the second phosphor layer 32 emits fluorescence of a third wavelength band under excitation of the blue light emitting chip. A fourth light source 14 is disposed on the opposite side of the second light source 12, and a fifth light source 15 is disposed on the opposite side of the third light source 13, so that the fourth light source 14 may excite the first phosphor layer 31, so that the first phosphor layer 31 is excited to emit fluorescent light of the second wavelength band again, and the fifth light source 15 may excite the second phosphor layer 32, so that the second phosphor layer 32 is excited to emit fluorescent light of the third wavelength band again.
The fourth light source 14 and the fifth light source 15 are both used for emitting excitation light, and then the fourth light source 14 and the fifth light source 15 may both emit blue light to excite the corresponding phosphor layer to emit fluorescence. When a blue laser is adopted, the excitation power of the fluorescent material can be improved, and the improvement of the light-emitting brightness of fluorescence is facilitated.
Fig. 3 is a second schematic structural diagram of a projection light source according to an embodiment of the invention.
Referring to fig. 3, in some embodiments, the second light source 12 may be a yellow light emitting diode, the third light source 13 may be a green light emitting diode, and then the first phosphor layer 31 in the second light source 12 may be a yellow phosphor layer; the second phosphor layer 32 in the third light source 13 may be a green phosphor layer. At this time, the first light source 11 emits blue light with a corresponding wavelength band of 430nm to 470 nm; the second light source 12 emits yellow light with a corresponding wavelength of 500-680 nm; the third light source 13 emits green light with the corresponding wavelength band of 500-570 nm.
Wherein, the light combination component further comprises a third light combination lens 23. The third light combining mirror 23 is located between the fifth light source 15 and the second light combining mirror 22, and the plane of the third light combining mirror 23 is perpendicular to the light outgoing direction of the fifth light source 15.
In practical implementation, the first light combining mirror 21 is used for transmitting blue light and reflecting yellow light; the second light-combining mirror 22 is used for transmitting blue light and red light and reflecting green light; the third combiner 23 is configured to transmit blue light and reflect green light.
In fig. 3, a represents a green light propagation path, b represents a red light propagation path, c represents a blue light propagation path, and d represents a yellow light propagation path. Specifically, the blue light emitted from the first light source 11 is emitted through the first light combiner 21 and the second light combiner 22 in sequence. The excitation light in the third light source 13 is incident to the green phosphor layer to generate green light, and the blue light emitted from the fifth light source 15 is incident to the green phosphor layer through the third light combiner 23 and the second light combiner 22 to generate green light; the green light enters the second combiner 22 and is reflected, and the reflected green light exits from the second combiner 22 side. The excitation light in the second light source 12 is incident to the yellow phosphor layer to generate yellow light, and the blue light emitted from the fourth light source 14 is incident to the yellow phosphor layer through the first light combiner 21 to generate yellow light; the yellow light is reflected by the first light combining mirror 21 and enters the second light combining mirror 22; since the wavelength band 500-680nm of the yellow color includes the wavelength band 600-680nm of the red light, after the yellow light enters the second light combining mirror 22, the red light in the wavelength band of the yellow color is emitted through the second light combining mirror 22. And finally, mixing the green light, the red light and the blue light into white light to be emitted.
In addition, it should be noted that, since the band 500-680nm of the yellow color includes the band 500-570nm of the green light, after the yellow light reaches the second light combining mirror 22, the green light in the band of the yellow color is reflected by the second light combining mirror 22, the reflected green light is incident on the third light combining mirror 23 and then reflected back to the second light combining mirror 22, and then reflected back to the first light combining mirror 21 by the second light combining mirror 22, and finally the green light is reflected back to the yellow phosphor layer by the first light combining mirror 21, and the yellow phosphor layer is re-excited to generate the yellow light, and this is repeated. The reflected green light can thus be used continuously for re-exciting the yellow phosphor layer, so that the total intensity of the stimulated emission of yellow light can be increased. The excitation efficiency of the yellow fluorescent powder layer is higher than that of the red fluorescent powder layer, so that the yellow fluorescent powder layer is adopted to replace the red fluorescent powder layer in the embodiment of the invention, the yellow fluorescent powder layer is excited by the light source to generate yellow light, and then the red light is extracted from the yellow light by the second light combining mirror 22 to be transmitted, so that the brightness of the red light and the green light in the three-color light is improved, the proper brightness ratio of the three-color light is achieved, the light efficiency is improved, the light loss is reduced, and the display effect of the projection system is improved.
The second light combining mirror 22 provided in the embodiment of the present invention can extract red light with a specific wavelength range from yellow light generated by exciting a yellow phosphor layer according to requirements of different projection systems, thereby improving a color gamut of the red light and improving a display effect of the projection system.
In some embodiments, the wavelength ranges of the light in the second wavelength band emitted by the first phosphor layer 31 and the light in the third wavelength band emitted by the second phosphor layer 32 are not overlapped, that is, the light emitted by the first phosphor layer 31 and the light emitted by the second phosphor layer 32 belong to different colors, so that channels of different color components can be clearly distinguished, and finally white light is synthesized.
Referring to fig. 2, in some embodiments, the second light source 12 may be a green light emitting diode, the third light source 13 may be a red light emitting diode, and then the first phosphor layer 31 in the second light source 12 may be a green phosphor layer; the second phosphor layer 32 in the third light source 13 is a red phosphor layer; the first color combining mirror 21 is used for transmitting blue light and reflecting green light; the second light combiner 22 is used for transmitting blue light and green light and reflecting red light.
At this time, the first light source 11 emits blue light with a corresponding wavelength band of 430nm to 470 nm; the second light source 12 emits green light with the corresponding wave band of 500-570 nm; the third light source 13 emits red light with a wavelength band of 600-680 nm.
In fig. 2, a represents a green light propagation path, b represents a red light propagation path, and c represents a blue light propagation path. Specifically, the blue light emitted from the first light source 11 is emitted through the first light combiner 21 and the second light combiner 22 in sequence. The excitation light in the second light source 12 is incident to the green fluorescent powder layer to generate green light, and the blue light emitted by the fourth light source 14 is incident to the green fluorescent powder layer through the first light combining mirror 21 to generate green light; the green light is reflected by the first light combining mirror 21 and enters the second light combining mirror 22; and finally exits through the second combiner 22. The excitation light in the third light source 13 is incident to the red phosphor layer to generate red light, and the blue light emitted from the fifth light source 15 is incident to the red phosphor layer through the second light combiner 22 to generate red light; the red light is reflected by the second light combining mirror 22 and then emitted. Finally, the green light, the red light and the blue light are mixed into white light to be emitted.
The five-channel light source provided by the embodiment of the invention is provided with two groups of opposite excitation light sources for respectively exciting to generate green fluorescence and red fluorescence, so that the green fluorescent powder layer generates green light under the excitation of the second light source 12 and the fourth light source 14 twice, the red fluorescent powder layer generates red light under the excitation of the third light source 13 and the fifth light source 15 twice, the excitation times of exciting the green fluorescent powder layer and the red fluorescent powder layer are increased, the brightness of the red light and the green light in the three primary colors is increased, the proper brightness ratio of the three primary colors is achieved, and the display effect of the projection system is further improved.
Fig. 4 is a third schematic structural diagram of a projection light source according to an embodiment of the present invention.
Referring to fig. 4, in some embodiments, the second light source 12 may be a green light emitting diode, the third light source 13 may be a yellow light emitting diode, and then the first phosphor layer 31 in the second light source 12 is a green phosphor layer; the second phosphor layer 32 in the third light source 13 is a yellow phosphor layer; the first light combining mirror 21 is used for transmitting blue light and reflecting green light; the second light combiner 22 is used for transmitting blue light and green light and reflecting red light.
At this time, the first light source 11 emits blue light with a corresponding wavelength band of 430nm to 470 nm; the second light source 12 emits green light with the corresponding wave band of 500-570 nm; the third light source 13 emits yellow light with a wavelength band of 500-680 nm.
In fig. 4, a represents a green light propagation path, b represents a red light propagation path, c represents a blue light propagation path, and d represents a yellow light propagation path. Specifically, the blue light emitted from the first light source 11 is emitted through the first light combiner 21 and the second light combiner 22 in sequence. The blue light emitted from the fourth light source 14 passes through the first light combining mirror 21 and enters the green phosphor layer to generate green light; the green light is reflected by the first light combining mirror 21 and enters the second light combining mirror 22; and finally exits through the second combiner 22. The excitation light in the third light source 13 is incident to the yellow phosphor layer to generate yellow light, and the blue light emitted from the fifth light source 15 is incident to the yellow phosphor layer through the second combiner 22 to generate yellow light; since the wavelength band 500-680nm of the yellow color includes the wavelength band 600-680nm of the red light, after the yellow light enters the second light combining mirror 22, the red light in the wavelength band of the yellow color is reflected, and the reflected red light is emitted from the second light combining mirror 22 side. Finally, the green light, the red light and the blue light are mixed into white light to be emitted.
The five-channel light source provided by the embodiment of the invention can enable the green fluorescent powder layer to generate green light under the excitation of the second light source 12 and the fourth light source 14 twice, and enable the yellow fluorescent powder layer to generate yellow light under the excitation of the third light source 13 and the fifth light source 15 twice, so that the times of respectively exciting the green fluorescent powder layer and the yellow fluorescent powder layer are increased, and the total intensity of the excited and emitted fluorescent light is increased. Because the excitation efficiency of the yellow fluorescent powder layer is higher than that of the red fluorescent powder layer, the yellow fluorescent powder layer is adopted to replace the red fluorescent powder layer in the embodiment of the invention, the yellow fluorescent powder layer is excited by the light source to generate yellow light, and then red light is extracted from the yellow light by the second light combining mirror 22 to be reflected, so that the brightness of red light and green light in three-color light is improved, the proper brightness ratio of the three-color light is achieved, and the display effect of the projection system is further improved.
The second light combining mirror 22 provided in the embodiment of the present invention can extract red light with a specific wavelength range from yellow light generated by exciting a yellow phosphor layer according to requirements of different projection systems, thereby improving a color gamut of the red light and improving a display effect of the projection system.
In the embodiment provided by the invention, the light combining mirrors in the light combining assembly can adopt dichroic mirrors, the dichroic mirrors are formed by coating on the surfaces of the transparent flat plates by using a thin film interference principle, and when the design is carried out, when the incident angle of light incident to the dichroic mirrors is 35-55 degrees, the transmittance of the dichroic mirrors to light with an anti-reflection wavelength is more than 95%, and the transmittance of the dichroic mirrors to light with an anti-reflection wavelength is less than 1%, so that a better light extraction effect can be realized.
Fig. 5 is a schematic structural diagram of a projection system according to an embodiment of the present invention.
Referring to fig. 5, the projection system provided in the embodiment of the present invention further includes: a dodging component 40, an imaging lens group 50, an illumination light path 60, a light valve modulation component 70 and a projection lens 80.
The dodging part 40 is positioned on the light emergent path of the second light combining mirror 22; the imaging lens group 50 is positioned on the light-emitting side of the dodging component 40; the illumination light path 60 is located on the side of the imaging lens group 50 away from the dodging component 40; the light valve modulation section 70 is located on the light exit side of the illumination light path 60; the projection lens 80 is located on the light exit side of the light valve modulating member 70.
Specifically, the light valve modulating component 70 may be a DMD, which is a core device of the whole projection system. The monolithic DMD application will be described below as an example. The DMD is a reflective light valve device, and the light emitted from the second light combiner 22 passes through the dodging of the dodging component 40 and the convergence of the imaging lens group 50 to enter the illumination light path 60. After passing through illumination path 60, the light beam conforms to the required illumination size and angle of incidence for the DMD. The DMD surface includes thousands of minute mirrors, each of which can be individually driven to deflect, and the reflected light is made incident to the projection lens 80 by controlling the deflection angle of the DMD, and used for projection imaging after being imaged by the projection lens.
According to a first inventive concept, a projection system comprises: five light sources and two light-combining mirrors. The first light source is used for emitting light of a first wave band, the second light source is used for emitting light of a second wave band, the third light source is used for emitting light of a third wave band, the fourth light source is used for irradiating and exciting the second light source so as to increase stimulated emission times of the fluorescent powder layer in the second light source, and the fifth light source is used for irradiating and exciting the third light source so as to increase stimulated emission times of the fluorescent powder layer in the third light source and improve total intensity of fluorescence in the light sources. And finally, the first light combining lens combines emergent light of the first light source and the second light source and then emits the combined light to the second light combining lens, and the second light combining lens combines emergent light of the first light combining lens and emergent light of the third light source and then emits the combined light to form white light, so that the output brightness of the light source is improved, and the display effect of the projection system is optimized.
According to the second inventive concept, the second light source and the third light source are arranged in parallel, the fourth light source and the fifth light source are arranged in parallel, and the light emitting directions of the first light source and the other four light sources are perpendicular to each other. The first light combining mirror is positioned between the second light source and the fourth light source and forms an angle of 45 degrees with the light outgoing directions of the second light source and the fourth light source; the second light combining mirror is positioned between the third light source and the fifth light source and forms an angle of 45 degrees with the light emitting directions of the third light source and the fifth light source. The reflected light and the transmitted light of the light combination component form an included angle of 90 degrees, and then the light rays are parallel to each other when finally emitted by the second light combination mirror.
According to the third inventive concept, the first light source, the fourth light source, and the fifth light source are used to emit blue light, and may each employ a blue light emitting diode or a blue laser.
According to a fourth inventive concept, the second light source and the third light source are both light emitting diodes and both include light emitting chips emitting blue light, the second light source includes a first phosphor layer, the third light source includes a second phosphor layer, and the phosphor layers in the light sources are excited by the blue light to emit different colors of fluorescence.
According to the fifth inventive concept, the second light source is a yellow light emitting diode, and the third light source is a green light emitting diode; the first fluorescent powder layer is a yellow fluorescent powder layer; the second fluorescent powder layer is a green fluorescent powder layer; the light combination component also comprises a third light combination mirror, and the first light combination mirror is used for transmitting blue light and reflecting yellow light; the second light combining mirror is used for transmitting blue light and red light and reflecting green light; the third light combining mirror is used for transmitting blue light and reflecting green light; because the waveband 500-680nm of the yellow light comprises the waveband 500-570nm of the green light, after the yellow light reaches the second light combining mirror, the green light in the waveband of the yellow light is reflected by the second light combining mirror, the reflected green light is incident on the third light combining mirror and then reflected back to the second light combining mirror, and then reflected back to the first light combining mirror by the second light combining mirror, and finally the green light is reflected back to the yellow fluorescent powder layer by the first light combining mirror, and the yellow fluorescent powder layer is re-excited to generate the yellow light, and the steps are repeated. The reflected green light can thus be used continuously for re-exciting the yellow phosphor layer, so that the total intensity of the stimulated emission of yellow light can be increased. The excitation efficiency of the yellow fluorescent powder layer is higher than that of the red fluorescent powder layer, so that the yellow fluorescent powder layer is adopted to replace the red fluorescent powder layer, the yellow fluorescent powder layer is excited by the light source to generate yellow light, and then red light is extracted from the yellow light by the second light combining mirror to be reflected, so that the brightness of red light and green light in three-color light is improved, the proper brightness ratio of three-primary-color light is achieved, and the display effect of the projection system is improved.
According to the sixth inventive concept, the second light source is a green light emitting diode, and the third light source is a yellow light emitting diode; the first fluorescent powder layer is a green fluorescent powder layer; the second fluorescent powder layer is a yellow fluorescent powder layer; the first light combining mirror is used for transmitting blue light and reflecting green light; the second light combining mirror is used for transmitting blue light and green light and reflecting red light; the green fluorescent powder layer generates green light under the excitation of the second light source and the fourth light source twice, and the yellow fluorescent powder layer generates yellow light under the excitation of the third light source and the fifth light source twice, so that the times of respectively exciting the green fluorescent powder layer and the yellow fluorescent powder layer are increased, and the total intensity of the fluorescence emitted by excitation is increased. The excitation efficiency of the yellow fluorescent powder layer is higher than that of the red fluorescent powder layer, so that the yellow fluorescent powder layer is adopted to replace the red fluorescent powder layer, the yellow fluorescent powder layer is excited by the light source to generate yellow light, and then red light is extracted from the yellow light by the second light combining mirror to be reflected, so that the brightness of red light and green light in three-color light is improved, the proper brightness ratio of three-primary-color light is achieved, and the display effect of the projection system is improved.
According to the seventh inventive concept, the second light combining mirror can extract red light with a specific wavelength range from yellow light generated by exciting the yellow fluorescent powder layer according to requirements of different projection systems, so that the color gamut of the red light is improved, and the display effect of the projection system is improved.
According to the eighth inventive concept, the light combining mirrors in the light combining assembly can all adopt dichroic mirrors, the dichroic mirrors are formed by coating films on the surfaces of the transparent flat plates by using the thin film interference principle, and when the light enters the dichroic mirrors at an incident angle of 35-55 degrees, the transmittance of the dichroic mirrors to the light with the anti-reflection wavelength is greater than 95%, and the transmittance of the dichroic mirrors to the light with the anti-reflection wavelength is less than 1%, so that a good light extraction effect can be realized.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A projection system, comprising:
five light sources which are divided into a first light source, a second light source, a third light source, a fourth light source and a fifth light source; wherein the fourth light source and the second light source are oppositely arranged, and the fifth light source and the third light source are oppositely arranged; the emergent light of the first light source covers a first waveband, the emergent light of the second light source covers a second waveband, the emergent light of the third light source covers a third waveband, the fourth light source is used for irradiating and exciting the second light source, and the fifth light source is used for irradiating and exciting the third light source;
the light combination component is positioned at the intersection of emergent light of the light source and used for mixing the emergent light of the light source into white light to be emitted; the light combination component comprises a first light combination lens and a second light combination lens; the first light combining mirror is positioned at the intersection of emergent lights of the first light source and the second light source and is used for transmitting the light rays of the first wave band and reflecting the light rays of the second wave band; the second light combining mirror is positioned at the intersection of the emergent light of the first light combining mirror and the emergent light of the third light source and is used for transmitting the light rays of the first wave band and the second wave band and reflecting the light rays of the third wave band to form white light emergent light;
wherein the first light source, the fourth light source, and the fifth light source are configured to emit blue light;
the second light source comprises a first phosphor layer, and the third light source comprises a second phosphor layer; the first fluorescent powder layer is a yellow fluorescent powder layer, and the second fluorescent powder layer is a green fluorescent powder layer;
the light combining component further comprises: the third light combining mirror is positioned between the fifth light source and the second light combining mirror;
the first light combining mirror is used for transmitting blue light and reflecting yellow light; the second light combining mirror is used for transmitting blue light and red light and reflecting green light; the third light combining mirror is used for transmitting blue light and reflecting green light;
red light in the yellow light reflected by the first light combining mirror is transmitted by the second light combining mirror, and green light is reflected by the second light combining mirror to the third light combining mirror; the green light incident to the third light combiner is reflected by the third light combiner, the second light combiner and the first light combiner in sequence and then incident to the second light source again.
2. The projection system of claim 1, wherein the second light source and the third light source are juxtaposed and the fourth light source and the fifth light source are juxtaposed.
3. The projection system of claim 1, wherein the first light source, the fourth light source, and the fifth light source are blue light emitting diodes or blue lasers.
4. The projection system of claim 1, wherein the second light source and the third light source are light emitting diodes.
5. The projection system of claim 4, wherein the second light source is a yellow light emitting diode for emitting yellow light; the third light source is a green light emitting diode and is used for emitting green light.
6. The projection system of any of claims 1-5, further comprising:
the light homogenizing component is positioned on the light emergent path of the second light combining mirror;
the imaging lens group is positioned on the light outlet side of the dodging component;
an illumination light path which is positioned on one side of the imaging lens group, which is far away from the dodging component;
the light valve modulation component is positioned on the light emitting side of the illumination light path; and
and the projection lens is positioned on the light emitting side of the light valve modulation component.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110729252.8A CN113406850B (en) | 2021-06-29 | 2021-06-29 | Projection system |
| PCT/CN2022/101462 WO2023274130A1 (en) | 2021-06-29 | 2022-06-27 | Projection apparatus |
| CN202280047132.2A CN117616332A (en) | 2021-06-29 | 2022-06-27 | Projection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110729252.8A CN113406850B (en) | 2021-06-29 | 2021-06-29 | Projection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113406850A CN113406850A (en) | 2021-09-17 |
| CN113406850B true CN113406850B (en) | 2022-09-23 |
Family
ID=77680128
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110729252.8A Active CN113406850B (en) | 2021-06-29 | 2021-06-29 | Projection system |
| CN202280047132.2A Pending CN117616332A (en) | 2021-06-29 | 2022-06-27 | Projection apparatus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280047132.2A Pending CN117616332A (en) | 2021-06-29 | 2022-06-27 | Projection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN113406850B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023274130A1 (en) * | 2021-06-29 | 2023-01-05 | 青岛海信激光显示股份有限公司 | Projection apparatus |
| WO2023245936A1 (en) * | 2022-06-23 | 2023-12-28 | 青岛海信激光显示股份有限公司 | Light source device and projection system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012053057A1 (en) * | 2010-10-19 | 2012-04-26 | Ｎｅｃディスプレイソリューションズ株式会社 | Lighting device and projection type display device using same |
| EP3282317B1 (en) * | 2015-04-09 | 2021-08-04 | Appotronics Corporation Limited | Light-emitting device and projection system |
| CN207992666U (en) * | 2018-03-23 | 2018-10-19 | 杭州有人光电技术有限公司 | A kind of projecting illumination system of LED and laser light source composition |
| CN108415212A (en) * | 2018-03-23 | 2018-08-17 | 杭州有人光电技术有限公司 | A kind of projecting illumination system of LED and laser light source composition |
| CN209514288U (en) * | 2019-04-17 | 2019-10-18 | 杭州有人光电技术有限公司 | A kind of projecting illumination system of laser induced fluorescence and laser composition |
| CN215006225U (en) * | 2021-06-29 | 2021-12-03 | 青岛海信激光显示股份有限公司 | Projection system |
-
2021
- 2021-06-29 CN CN202110729252.8A patent/CN113406850B/en active Active
-
2022
- 2022-06-27 CN CN202280047132.2A patent/CN117616332A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN113406850A (en) | 2021-09-17 |
| CN117616332A (en) | 2024-02-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107505807A (en) | A kind of LASER Light Source and projection display apparatus | |
| EP3599509A2 (en) | Light source apparatus and image projection apparatus | |
| CN113625522B (en) | Laser projection system | |
| CN112147836B (en) | Light source system and display device | |
| CN113406850B (en) | Projection system | |
| CN113448159A (en) | Laser light source device and projection system | |
| US11402735B2 (en) | Projection system for projection display | |
| WO2020216263A1 (en) | Light source system and display device | |
| CN215006225U (en) | Projection system | |
| WO2022037196A1 (en) | Three-color light source device and projection display device | |
| US10551031B2 (en) | Light source apparatus and projection display apparatus | |
| US11156907B2 (en) | Light source apparatus and projection display apparatus | |
| CN218413176U (en) | Projection equipment | |
| CN215181380U (en) | Laser light source device and projection system | |
| CN112213908B (en) | Light source system and display device | |
| CN115113472A (en) | Light source device and projection system | |
| CN218099912U (en) | Light source device and projection system | |
| CN112147835B (en) | Optical engine system and display device | |
| CN113885285A (en) | Light source assembly and projection equipment | |
| US11175578B2 (en) | Light source system and projection system using the same | |
| CN217879958U (en) | Light source device and projection system | |
| CN217767174U (en) | Light source device and projection system | |
| CN115343903A (en) | Light source device and projection system | |
| CN220040950U (en) | Light source and optical machine | |
| WO2021109781A1 (en) | Projection optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |