CN219016784U - Fixed wavelength conversion projection system - Google Patents

Abstract

The utility model belongs to the field of projection, and particularly relates to a fixed wavelength conversion projection system, which comprises a light source, a beam splitting wheel, a beam splitting piece, a fixed wavelength conversion module and a collecting lens, wherein the fixed wavelength conversion module is used for converting a first beam splitting beam of a first laser beam into a third beam, and the wavelength of the third beam is different from that of the first laser beam, so that the projected light accords with expected green light; meanwhile, the light source is separated from the fixed wavelength conversion module, so that more space is available for obtaining more blue light through superposition of the first light splitting beam to excite and convert the blue light to generate more green light, and the brightness bottleneck problem of the blue light chip is broken through; the first laser beam is divided into two split beams through the split beam wheel, so that the split beam can be used for exciting and converting green light and can also be used as blue light, the blue light can be fully utilized, the efficiency is improved, and the cost is reduced.

Description

Fixed wavelength conversion projection system

Technical Field

The utility model belongs to the field of projection, and particularly relates to a fixed wavelength conversion projection system.

Background

The LED light source has been the mainstream in the field of projection display by virtue of its advantages of long lifetime, high efficiency, good color, and the like. However, the light emitted by the light source may deviate from the expected color coordinate point on the chromaticity coordinates, or the light may undergo color deviation or chromatic aberration after being refracted or reflected by a plurality of optical components, which affects the color display to be unexpected.

In the practical use process, a red, green and blue LED light source is adopted as a projection light source, wherein the red and blue LED light source usually directly utilizes a light emitting diode to emit light, and a green LED light source usually covers green fluorescent powder on a blue light chip, so that the green fluorescent powder is excited by blue light to obtain more economical green light, but the green light is limited by the bottleneck of the brightness of the blue light at the bottom layer under the condition that the light emitting area is unchanged, and the bottleneck of the brightness of the green light also exists.

Disclosure of Invention

The utility model provides a fixed wavelength conversion projection system, which converts a first split beam of a first laser beam into a third beam by a fixed wavelength conversion module, wherein the wavelength of the third beam is different from that of the first laser beam, so that the projected light accords with expected green light; meanwhile, the light source is separated from the fixed wavelength conversion module, so that more space is available for obtaining more blue light through superposition of the first light splitting beam to excite and convert the blue light to generate more green light, and the brightness bottleneck problem of the blue light chip is broken through; the first laser beam is divided into two split beams through the split beam wheel, so that the split beam can be used for exciting and converting green light and can also be used as blue light, the blue light can be fully utilized, the efficiency is improved, and the cost is reduced.

A stationary wavelength-converted projection system, comprising:

a light source including a first light source for emitting a first laser beam; the first laser beam has a first wavelength, and the first laser beam is a blue light beam;

the beam splitting wheel is obliquely arranged on the light emitting path of the first laser beam and is used for splitting the first laser beam into a first split beam and a second split beam and transmitting the first split beam and reflecting the second split beam;

the light splitting sheet comprises a first light splitting sheet, a second light splitting sheet and a third light splitting sheet; the first beam splitting sheet is positioned on the light emergent path of the first beam splitting and is perpendicular to the beam splitting wheel, and is used for reflecting the first beam splitting; the second light splitting piece is positioned on the light emitting path of the second light splitting beam and is parallel to the light splitting wheel and used for reflecting the second light splitting beam; the third light splitting sheet is positioned on the light emitting path of the second light splitting beam reflected by the second light splitting sheet and is axially symmetrically arranged with the first light splitting sheet for reflecting the second light splitting beam;

the surface of the fixed wavelength conversion module is covered with a green fluorescent layer; the fixed wavelength conversion module is positioned on an emergent light path of the first split beam reflected by the first split sheet and is used for receiving the first split beam reflected by the first split sheet and converting the first split beam into a third beam; the third light beam has a second wavelength different from the first wavelength, and the third light beam is a green light beam.

Converting the first split beam of the first laser beam into a third beam by a fixed wavelength conversion module, wherein the wavelength of the third beam is different from that of the first laser beam, so that the projected light accords with expected green light; meanwhile, the light source is separated from the fixed wavelength conversion module, so that more space is available for obtaining more blue light through superposition of the first light splitting beam to excite and convert the blue light to generate more green light, and the brightness bottleneck problem of the blue light chip is broken through; the first laser beam is divided into two split beams through the split beam wheel, so that the split beam can be used for exciting and converting green light and can also be used as blue light, the blue light can be fully utilized, the efficiency is improved, and the cost is reduced.

Further, the light source further comprises a second light source for emitting a second laser beam, and the second laser beam is a red light beam.

The second light source which emits red light beams is independently arranged and used for constructing the red, blue and green LED light source, so that the red brightness, chromaticity and purity are better.

Further, the first beam splitter is configured to reflect the first beam splitter and the second laser beam and transmit the third beam;

the third beam splitter is used for reflecting the second beam splitter and transmitting the second laser beam and the third beam.

The first light splitting piece and the second light splitting piece selectively reflect or transmit the light beams, so that the light beams are fully utilized, and meanwhile, the space is saved.

Further, the stationary wavelength conversion module includes:

a wavelength conversion layer for converting a first split beam of a first wavelength into a third beam of a second wavelength;

a reflective layer for reflecting the green fluorescent layer;

and the heat conduction layer is used for heat dissipation of the fixed wavelength conversion module.

By arranging the reflecting layer, more green light beams of the laser are reflected to the surface, so that the conversion capability and conversion efficiency of the fixed wavelength conversion module are improved; and meanwhile, the heat conducting layer is arranged, so that the rapid heat dissipation of the fixed wavelength conversion module is facilitated.

Further, the device also comprises a collecting lens; the collecting lens includes:

the first collecting lens is arranged between the first light source and the beam splitting wheel and is positioned on the light emitting path of the first laser beam;

the second collecting lens is arranged between the fixed wavelength conversion module and the first light splitting sheet and is positioned on a light emergent path of the second split beam reflected by the first light splitting sheet and a light emergent path of the third beam converted by the fixed wavelength conversion module;

the third collecting lens is arranged between the second light source and the first light splitting sheet and is positioned on the light emitting path of the second laser beam.

And a plurality of collecting lenses are arranged for converging the collimated light beams, so that the transmission efficiency of the system is improved.

Further, the green phosphor layer includes green phosphor powder, which is formed by sintering ceramic.

The green fluorescent powder formed by sintering the ceramic can greatly improve the problems of thermal saturation and thermal quenching of the green fluorescent powder.

The beneficial effects of the utility model are as follows:

the utility model converts the first split beam of the first laser beam into the third beam through the fixed wavelength conversion module, and the wavelength of the third beam is different from that of the first laser beam, so that the projected light accords with the expected green light; meanwhile, the light source is separated from the wavelength conversion module, so that more space is available for obtaining more blue light through superposition of the first light splitting beam to excite and convert the blue light to generate more green light, and the brightness bottleneck problem of a blue light chip is broken through; the first laser beam is divided into two split beams through the split beam wheel, so that the split beam can be used for exciting and converting green light and can also be used as blue light, the blue light can be fully utilized, the efficiency is improved, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the light beam and the light path of the present utility model.

Reference numerals:

11. a first light source; 111. a first laser beam; 1111. a first split beam; 1112. a second split beam; 12. a second light source; 121. a second laser beam; 13. a third light beam;

2. a beam-splitting wheel;

31. a first beam splitter; 32. a second light splitting sheet; 33. a third light splitting sheet;

4. a stationary wavelength conversion module; 41. a wavelength conversion layer; 42. a reflective layer; 43. a heat conducting layer;

51. a first collection lens; 52. a second collection lens; 53. a third collection lens;

61. a green light path; 62. a blue light path; 63. and a red light path.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Fig. 1 shows a stationary wavelength-converted projection system, which includes a light source, a beam splitter 2, a beam splitter, a stationary wavelength conversion module 4 and a collecting lens, wherein the stationary wavelength conversion module 4 converts a first beam 1111 of a first laser beam 111 into a third beam 13, and the wavelength of the third beam 13 is different from that of the first laser beam 111, so that the projected light meets the expected green light; meanwhile, the light source is separated from the fixed wavelength conversion module 4, so that more space is available for obtaining more blue light through superposition of the first beam 1111 to excite conversion to generate more green light, and the brightness bottleneck problem of the blue light chip is broken through; the first laser beam 111 is divided into two split beams by the split wheel 2, so that the split wheel can be used for exciting and converting green light and can also be used as blue light, the blue light can be fully utilized, the efficiency is improved, and the cost is reduced.

In particular, a light source comprising:

a first light source 11 for emitting a first laser beam 111; the first laser beam 111 has a first wavelength, and the first laser beam 111 is a blue beam;

the second light source 12 is configured to emit a second laser beam 121, and the second laser beam 121 is a red light beam.

By providing the first light source 11 emitting a blue light beam, a part of which can be converted into a third light beam 13 of green light, blue light is fully utilized; by independently providing the second light source 12 emitting red light beams, the LED light sources with three colors of red, blue and green are constructed, so that the brightness, chromaticity and purity of red are better.

Specifically, the spectroscopic wheel 2 is obliquely disposed on the light-emitting path of the first laser beam 111, for dividing the first laser beam 111 into a first spectroscopic beam 1111 and a second spectroscopic beam 1112, and for transmitting the first spectroscopic beam 1111 and reflecting the second spectroscopic beam 1112;

in this embodiment, the beam splitting wheel 2 is 45 degrees to the light outgoing path of the first laser beam 111.

Specifically, a spectroscopic slice, comprising:

a first spectroscopic plate 31, which is located on the light-emitting path of the first spectroscopic beam 1111 and is arranged perpendicular to the spectroscopic wheel 2, for reflecting the first spectroscopic beam 1111;

among them, the first beam splitter 31 is for reflecting the first beam splitter 1111 and the second laser beam 121 and transmitting the third beam 13.

In this embodiment, the upper surface of the first light-splitting sheet 31 is coated with a red-reflecting blue-transmitting film, and the lower surface is coated with a blue-reflecting yellow-transmitting film for reflecting red and blue light and transmitting green light.

A second beam splitter 32, which is disposed on the light outgoing path of the second beam splitter 1112 and parallel to the beam splitter wheel 2, for reflecting the second beam splitter 1112;

in the present embodiment, the second light-splitting sheet 32 is coated with a blue-reflecting film for reflecting blue light.

And a third beam splitter 33 disposed on the light exit path of the second beam splitter 1112 reflected by the second beam splitter 32 and axisymmetrically arranged with the first beam splitter 31 for reflecting the second beam splitter 1112.

The third beam splitter 33 is configured to reflect the second beam splitter 1112 and transmit the second laser beam 121 and the third beam 13.

In this embodiment, the third light-splitting sheet 33 is coated with a blue-reflecting yellow-transmitting film on one side for reflecting blue light and transmitting red-green light.

Specifically, the fixed wavelength conversion module 4 is coated with a green phosphor layer on its surface; the fixed wavelength conversion module 4 is located on the light-emitting path of the first beam 1111 reflected by the first beam splitter 31, and is configured to receive the first beam splitter 1111 reflected by the first beam splitter 31 and convert the first beam splitter into a third beam 13; the third light beam 13 has a second wavelength different from the first wavelength, and the third light beam 13 is a green light beam.

Wherein the stationary wavelength conversion module 4 comprises:

a wavelength conversion layer 41 for converting the first partial beam 1111 of the first wavelength into the third beam 13 of the second wavelength;

a reflective layer 42 for reflecting the green fluorescent layer;

and a heat conductive layer 43 for heat dissipation of the stationary wavelength conversion module 4 itself.

By arranging the reflecting layer 42, more green light beams of the laser are reflected to the surface, so that the conversion capability and conversion efficiency of the fixed wavelength conversion module 4 are improved; and meanwhile, the heat conducting layer 43 is arranged, so that the rapid heat dissipation of the fixed wavelength conversion module 4 is facilitated.

In the method, the green fluorescent layer comprises green fluorescent powder, and the green fluorescent powder is formed by sintering ceramics, so that the problems of thermal saturation and thermal quenching of the green fluorescent powder can be greatly improved.

Specifically, a collection lens, comprising:

a first collecting lens 51 disposed between the first light source 11 and the beam-splitting wheel 2 and on the light-emitting path of the first laser beam 111;

a second collecting lens 52 disposed between the fixed wavelength conversion module 4 and the first beam splitter 31 and on the light-emitting path of the second beam splitter 1112 reflected by the first beam splitter 31 and the light-emitting path of the third beam 13 converted by the fixed wavelength conversion module 4;

the third collecting lens 53 is disposed between the second light source 12 and the first beam splitter 31 and is located on the light-emitting path of the second laser beam 121.

And a plurality of collecting lenses are arranged for converging the collimated light beams, so that the transmission efficiency of the system is improved.

As shown in fig. 2, the working principle of the utility model is as follows:

after the first light source 11 emits the first laser beam 111 with the first wavelength, the first laser beam is collected by the first collecting lens 51 and split into the first split beam 1111 and the second split beam 1112 by the splitting wheel 2; the first beam splitter 1111 transmits to the first beam splitter 31 through the beam splitter wheel 2, and respectively reflects through the first beam splitter 31 and gathers through the second collecting lens 52, then enters the fixed wavelength conversion module 4, converts to generate a third beam 13 with a second wavelength, and then respectively gathers through the second collecting lens 52 and transmits through the first beam splitter 31 and the third beam splitter 33 to form a green light path 61; the second beam 1112 is reflected to the second beam splitter 32 by the beam splitter 2, and then reflected by the second beam splitter 32 and the third beam splitter 33 to form a blue light path 62;

after the second light source 12 emits the second laser beam 121, the second laser beam is collected by the third collecting lens 53 and reflected by the first beam splitter 31 to form a red light path 63.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (6)

1. A stationary wavelength-converted projection system, comprising:

a light source comprising a first light source (11) for emitting a first laser light beam (111); the first laser beam (111) has a first wavelength and the first laser beam (111) is a blue beam;

a spectroscopic wheel (2) which is obliquely disposed on the light-emitting path of the first laser beam (111), for dividing the first laser beam (111) into a first sub-beam (1111) and a second sub-beam (1112), and for transmitting the first sub-beam (1111) and reflecting the second sub-beam (1112);

a light-splitting sheet including a first light-splitting sheet (31), a second light-splitting sheet (32), and a third light-splitting sheet (33); the first light splitting sheet (31) is positioned on the light emitting path of the first light splitting beam (1111) and is perpendicular to the light splitting wheel (2) and is used for reflecting the first light splitting beam (1111); the second beam splitter (32) is positioned on the light emergent path of the second beam splitter (1112) and is parallel to the beam splitter wheel (2) and is used for reflecting the second beam splitter (1112); the third light splitting sheet (33) is positioned on the light emergent path of the second light splitting beam (1112) reflected by the second light splitting sheet (32), and is axially symmetrically arranged with the first light splitting sheet (31) and is used for reflecting the second light splitting beam (1112);

a stationary wavelength conversion module (4) having a green phosphor layer on the surface thereof; the fixed wavelength conversion module (4) is positioned on an emergent light path of the first split beam (1111) reflected by the first light splitting sheet (31) and is used for receiving the first split beam (1111) reflected by the first light splitting sheet (31) and converting the first split beam into a third beam (13); the third light beam (13) has a second wavelength different from the first wavelength, the third light beam (13) being a green light beam.

2. A stationary wavelength-converted projection system according to claim 1, characterized in that the light source further comprises a second light source (12) for emitting a second laser beam (121), the second laser beam (121) being a red light beam.

3. A stationary wavelength converted projection system as claimed in claim 1,

the first beam splitter (31) is used for reflecting the first beam splitter (1111) and the second laser beam (121) and transmitting the third beam (13);

the third beam splitter (33) is configured to reflect the second beam splitter (1112) and transmit the second laser beam (121) and the third beam (13).

4. A stationary wavelength converting projection system according to claim 1, characterized in that the stationary wavelength converting module (4) comprises:

a wavelength conversion layer (41) for converting a first sub-beam (1111) of a first wavelength into a third beam (13) of a second wavelength;

a reflective layer (42) for reflecting the green phosphor layer;

and a heat conduction layer (43) for dissipating heat from the stationary wavelength conversion module (4) itself.

5. The stationary wavelength-converted projection system of claim 2 further comprising a collection lens; the collecting lens includes:

the first collecting lens (51) is arranged between the first light source (11) and the beam splitting wheel (2) and is positioned on the light emergent path of the first laser beam (111);

a second collection lens (52) disposed between the fixed wavelength conversion module (4) and the first beam splitter (31) and on an outgoing optical path of the second beam splitter (1112) reflected by the first beam splitter (31) and an outgoing optical path of the third beam (13) converted by the fixed wavelength conversion module (4);

and a third collecting lens (53) which is disposed between the second light source (12) and the first beam splitter (31) and is positioned on the light-emitting path of the second laser beam (121).

6. The stationary wavelength-converted projection system of claim 1 wherein the green phosphor layer comprises green phosphor powder that is sintered from ceramic.

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