CN215006225U

CN215006225U - Projection system

Info

Publication number: CN215006225U
Application number: CN202121476502.3U
Authority: CN
Inventors: 罗李浩男; 李巍
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-12-03
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a projection system includes at least: the light source comprises a first light source, a second light source, a third light source, a fourth light source, a first light combining mirror and a second light combining mirror; 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. 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

Projection system

Technical Field

The utility model relates to a projection display technology field especially relates 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.

At present, a projection light source generally comprises three channels which are used for emitting blue light, green light and red light respectively, light of three colors emitted by the three channels is mixed into white light to be emitted, however, the brightness of the final emitted light by adopting the three-channel light source is low, and therefore the projection display effect is influenced.

SUMMERY OF THE UTILITY MODEL

In some embodiments of the present invention, the projection system includes: at least four light sources and two light-combining mirrors. 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. 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.

The utility model discloses in some embodiments, still include the fifth light source, the fifth light source sets up with the fourth light source side by side, sets up relatively with the third light source for shine and arouse the third light source, improve the luminance of third light source stimulated emission light from this.

In some embodiments of the present invention, the first light source, the fourth light source and the fifth light source are used for emitting blue light, and can adopt blue light emitting diode or blue laser.

In some embodiments, the second light source and the third light source are both leds, 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 layer in the light source is excited by the blue light to emit different colors of fluorescent 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 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 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 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.

In some embodiments of the present invention, the wavelength of the light emitted by the 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 yellow phosphor layer is 500-680 nm.

In some embodiments of the present invention, the light emitting directions of the first light source and the second light source, the third light source, the fourth light source and the fifth light source are mutually perpendicular. The included angles between the first light combining mirror and the second light combining mirror and the light emitting direction of any one light source are 45 degrees, so that the reflected light and the transmitted light of the light combining assembly form a 90-degree included angle, and the light rays are finally parallel to each other when being emitted by the second light combining mirror.

In some embodiments of the present 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 required 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 for those skilled in the art, other drawings can be obtained according to these 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 structural diagram 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 present invention;

fig. 5 is a fourth schematic structural view of a projection light source according to an embodiment of the present invention;

fig. 6 is a fifth schematic view of a projection light source according to an embodiment of the present invention;

fig. 7 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 above objects, features and advantages of the present invention more comprehensible, the present invention will be further described with reference to 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 for expressing the position and direction described in the present invention are all the explanations given by taking the drawings as examples, but can be changed according to the needs, and the changes are all included in the protection scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship and do not represent true proportions.

A commonly used projection system is a Digital Light Processing (DLP) architecture, and a Digital Micromirror Device (DMD) is used as a core Device, Light emitted from a projection Light source is incident on the DMD to generate an image, and then the emergent Light of the image generated by the DMD is incident on a projection lens, and is imaged by the projection lens and 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 usually provided in the prior art, and is respectively used for emitting tricolor light, and finally, the tricolor light is mixed to form white light to be emitted. 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 from the second light source 12 and the third light source 13 is generally blue light to excite the fluorescent light emitted from the phosphor, and the efficiency of exciting the phosphor by using the three-channel light source is low, so that the brightness of the red light and the green light in the final emergent light is low, and the effect of projection display is affected.

In view of this, the embodiment of the present invention provides a projection system, which improves a projection light source for improving the output brightness of the projection light source and optimizing 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, a projection light source provided in the embodiment of the present invention includes at least four light sources and a light combining component.

The at least four light sources are respectively: a first light source 11, a second light source 12, a third light source 13 and a fourth light source 14; the second light source 12 and the third light source 13 are arranged in parallel, and the fourth light source 14 and the second light source 12 are arranged opposite to each other.

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, the 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 used for transmitting the light of the first wave band and the light of the second wave band and reflecting the light of the third wave band. Therefore, the light emitted from the second combiner 22 finally covers the first, second, and third wavelength bands, and the light in the three wavelength bands is mixed into white light to be emitted.

In the embodiment of the present invention, the first light source 11 can be used for emitting blue light, and specifically can adopt a blue light emitting diode or a blue laser. 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 the embodiment of the utility model provides an at least fourth light source 14 has been increased in projection light source, and when fourth light source 14 shines second light source 13, can arouse the phosphor powder stimulated emission once more in second light source 13, increase the number of times of arousing the phosphor powder from this, make the phosphor powder stimulated emission light increase at double to increased the total intensity of the fluorescence of stimulated emission, improved the output luminance of light source, and then optimized projection system's display effect.

Fig. 3 is a second schematic structural diagram of a projection light source according to an embodiment of the present invention.

As shown in fig. 3, a fifth light source 15 is added to the projection light source in order to further increase the luminance of the fluorescent light in the light emitted from the projection light source.

The fifth light source 15 and the fourth light source are arranged in parallel, are arranged opposite to the third light source 13, and are used for irradiating and exciting the third light source 13. Therefore, the fluorescent powder in the second light source 12 is simultaneously 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 simultaneously 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 emission 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 further optimized.

As shown in fig. 3, 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.

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. 3, 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. 3, 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. And finally, mixing the green light, the red light and the blue light into white light to be emitted.

Compared with a three-channel light source, the embodiment of the utility model provides a five-channel light source has increased fourth light source 14 and fifth light source 15, make green phosphor layer produce green light under second light source 12 and fourth light source 14's twice excitation, red phosphor layer produces red light under third light source 13 and fifth light source 15's twice excitation, the number of times of arousing green phosphor layer and red phosphor layer has been improved, improve the luminance of red light and green light in the three primary colors light from this, reach the suitable luminance ratio of three primary colors light, and then the display effect of projection system has been 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 red 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 red phosphor layer; the second phosphor layer 32 in the third light source 13 may be a green phosphor layer; the first light combining mirror 21 is used for transmitting blue light and reflecting red light; the second light combiner 22 is used to transmit blue light and red light and reflect green 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 red light with a corresponding wavelength band of 600 and 680 nm; the third light source 13 emits green light with the corresponding wavelength band of 500-570 nm.

In fig. 4, 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 red phosphor layer to generate red light, and the blue light emitted from the fourth light source 14 is incident to the red phosphor layer through the first light combiner 21 to generate red light; the red light is reflected by the first light combining mirror 21 and then 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 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 second combiner 22 to generate green light; the green light is reflected by the second light combining mirror 22 and then emitted. And finally, mixing the red light, the green light and the blue light into white light to be emitted.

Compared with a three-channel light source, the embodiment of the utility model provides a five-channel light source has increased fourth light source 14 and fifth light source 15, red phosphor layer produces red light under second light source 12 and fourth light source 14's twice excitation, green phosphor layer produces green light under third light source 13 and fifth light source 15's twice excitation, the number of times of arousing red phosphor layer and green phosphor layer has been improved, improve the luminance of red light and green light in the three primary colors light from this, reach the suitable luminance ratio of three primary colors light, and then the display effect of projection system has been improved.

Because the red phosphor layer is limited by the properties of the red phosphor, and the excitation efficiency is not high, the embodiment of the present invention provides another implementation manner.

In some embodiments, there is an overlapping region of the wavelength ranges of the second wavelength band that is excited to be emitted by the first phosphor layer 31 and the third wavelength band that is excited to be emitted by the second phosphor layer 32. That is, the light emitted by the first phosphor layer 31 or the second phosphor layer 32 is mixed light, so that monochromatic light with a desired wavelength band can be separated from the mixed light, and finally white light is synthesized.

Fig. 5 is a fourth schematic structural view of a projection light source according to an embodiment of the present invention.

Referring to fig. 5, 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. 5, 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. And finally, mixing the green light, the red light and the blue light into white light to be emitted.

Compared with a three-channel light source, the embodiment of the utility model provides a five-channel light source can make green phosphor layer produce green light under the twice excitation of second light source 12 and fourth light source 14, and yellow phosphor layer produces yellow light under the twice excitation of third light source 13 and fifth light source 15, has increased the number of times that green phosphor layer and yellow phosphor layer were aroused respectively, makes the total intensity increase of the fluorescence of stimulated emission. Because the excitation efficiency of yellow phosphor layer is greater than the excitation efficiency of red phosphor layer, consequently the embodiment of the utility model provides an adopt yellow phosphor layer to replace red phosphor layer, the light source arouses yellow phosphor layer to produce yellow light, adopts the second to close light mirror 22 to extract red light in yellow light again and reflects, improves the luminance of red light and green light in the three-color light from this, reaches the suitable luminance ratio of three primary colors light, and then has improved projection system's display effect.

The embodiment of the utility model provides a second closes light mirror 22 can be according to different projection system's demand, draws the ruddiness of specific wavelength range in the yellow light that arouses yellow phosphor layer to produce, and then promotes the colour gamut of red light, improves projection system's display effect.

Fig. 6 is a fifth schematic view of a projection light source according to an embodiment of the present invention.

Referring to fig. 6, 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. 6, 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. And the excitation efficiency on yellow phosphor layer is greater than the excitation efficiency on red phosphor layer, consequently the embodiment of the utility model provides an adopt yellow phosphor layer to replace red phosphor layer, the light source arouses yellow phosphor layer to produce yellow light, adopts the second to close light mirror 22 to extract red light in yellow light again and transmits, improves the luminance of red light and green light in the three-color light from this, reaches the suitable luminance ratio of three primary colors light, and then has improved projection system's display effect.

The utility model provides an in the embodiment, the dichroic mirror all can be adopted to the light combination mirror that closes in the optical subassembly, and the dichroic mirror utilizes the film to interfere the principle and forms at transparent dull and stereotyped surface coating, when designing, and the incident angle that incides the dichroic mirror when light is 35-55, and the transmittance of dichroic mirror to the light of anti-reflection wavelength is greater than 95%, is less than 1% to the transmittance of the light of increasing anti-wavelength, can realize better light extraction effect from this.

Referring to fig. 7, an embodiment of the present invention provides a projection system, further including: 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 lens 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 the core device of the entire 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 aspect of the invention, a projection system comprises: at least four light sources and two light-combining mirrors. 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. 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 utility model, the projection system further comprises a fifth light source, the fifth light source is arranged in parallel with the fourth light source and is arranged opposite to the third light source, and the fifth light source is used for irradiating and exciting the third light source, thereby improving the brightness of the stimulated emission light of the third light source.

According to the third utility model concept, first light source, fourth light source and fifth light source are used for outgoing blue light, all can adopt blue light emitting diode or blue laser.

According to the fourth utility model, the second light source and the third light source are light emitting diode, all include the luminescence chip of outgoing blue light, and the second light source includes first phosphor layer, and the third light source includes the second phosphor layer, and the phosphor layer in the light source receives the blue light to arouse the fluorescence of different colours of outgoing.

According to a fifth novel concept, 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 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, the red fluorescent powder layer generates red light under the excitation of the third light source and the fifth light source 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 color light is increased, the proper brightness ratio of the three primary color light is achieved, and the display effect of the projection system is further improved.

According to the concept of the sixth utility model, 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 light combining mirror is used for transmitting blue light and red light and reflecting green light; the red fluorescent powder layer generates red light under the excitation of the second light source and the fourth light source twice, the green fluorescent powder layer generates green light under the excitation of the third light source and the fifth light source twice, the excitation times of exciting the red fluorescent powder layer and the green fluorescent powder layer are increased, the brightness of the red light and the green light in the three primary color light is increased, the proper brightness ratio of the three primary color light is achieved, and the display effect of the projection system is further improved.

According to the seventh utility model, 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 eighth utility model, 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 band 500-680nm of the yellow color comprises the band 500-570nm of the green light, after the yellow light reaches the second light combining mirror, the green light in the band of the yellow color 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, 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 ninth utility model discloses think about, the second closes the light mirror can be according to different projection system's demand, draws the ruddiness of specific wavelength range in the yellow light that arouses yellow fluorescent powder layer to produce, and then promotes the colour gamut of red light, improves projection system's display effect.

According to the tenth utility model discloses think, close the light mirror among the light subassembly and all can adopt the dichroic mirror, the dichroic mirror utilizes the film to interfere the principle and forms at transparent dull and stereotyped surface coating, when carrying out the design, when the incident angle that light incides the dichroic mirror is 35-55, the transmittance of dichroic mirror to the light of anti-reflection wavelength is greater than 95%, is less than 1% to the transmittance of the light of increasing anti-wavelength, can realize better light extraction effect from this.

While the 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. It is therefore intended that the appended claims be interpreted as including the preferred embodiment 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 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 and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A projection system, comprising:

at least four light sources, which are divided into a first light source, a second light source, a third light source and a fourth light source; the second light source and the third light source are arranged in parallel, and the fourth light source and the second light source are arranged oppositely; 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, and the fourth light source is used for irradiating and exciting the second 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 located at the intersection of the emergent light of the first light combining mirror and the emergent light of the third light source and used for transmitting the light of the first wave band and the second wave band and reflecting the light of the third wave band to form white light emergent.

2. The projection system of claim 1, wherein the light source further comprises: a fifth light source; the fifth light source is arranged opposite to the third light source, is arranged in parallel with the fourth light source, and is used for irradiating and exciting the third light source.

3. The projection system of claim 2, wherein the first light source, the fourth light source, and the fifth light source are to emit blue light.

4. The projection system of claim 3, wherein the first light source, the fourth light source, and the fifth light source are blue light emitting diodes or blue lasers.

5. The projection system of claim 4, wherein the second light source and the third light source are light emitting diodes; the second light source includes a first phosphor layer and the third light source includes a second phosphor layer.

6. The projection system of claim 5, wherein the second light source is a green light emitting diode for emitting green light, and the first phosphor layer is a green phosphor layer; the third light source is a red light emitting diode and is used for emitting red light, and 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 light combining mirror is used for transmitting blue light and green light and reflecting red light.

7. The projection system of claim 5, wherein the second light source is a red light emitting diode for emitting red light, the first phosphor layer is a red phosphor layer; the third light source is a green light emitting diode and is used for emitting green light, and 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 light combining mirror is used for transmitting blue light and red light and reflecting green light.

8. The projection system of claim 5, wherein the second light source is a green light emitting diode for emitting green light, and the first phosphor layer is a green phosphor layer; the third light source is a yellow light emitting diode and is used for emitting yellow light, and the second fluorescent powder layer is a yellow fluorescent powder layer;

9. The projection system of claim 5, wherein the second light source is a yellow light emitting diode for emitting yellow light, and the first phosphor layer is a yellow phosphor layer; the third light source is a green light emitting diode and is used for emitting green light, and the second fluorescent powder layer is a green fluorescent powder layer;

the light combination 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;

wherein, the red light in the yellow light reflected by the first light combining mirror is transmitted by the second light combining mirror, and the 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.

10. The projection system of any of claims 1-9, further comprising:

the light homogenizing component is positioned on a 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;

a light valve modulation component, which is positioned on the light-emitting side of the illumination light path; and

and the projection lens is positioned on the light outlet side of the light valve modulation component.