CN114296166A - Reflection rotating wheel device and application thereof in laser speckle elimination - Google Patents
Reflection rotating wheel device and application thereof in laser speckle elimination Download PDFInfo
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Abstract
The invention discloses a reflection rotating wheel device and application thereof in laser speckle elimination, belonging to the technical field of laser display. The reflection rotating wheel device comprises a high-heat-conductivity high-reflection layer and a driving device, the high-heat-conductivity high-reflection layer is arranged on the upper surface of the driving device, the driving device drives the high-heat-conductivity high-reflection layer to rotate, the diffuse reflection intensity of the high-heat-conductivity high-reflection layer is not less than 65%, and the heat conductivity of the high-heat-conductivity high-reflection layer is not less than 30W m‑ 1K‑1. The reflection rotating wheel device is simple, convenient and practical, comprises the high-heat-conduction high-reflection layer and the driving device, and the high-heat-conduction high-reflection layer can realize high-intensity diffuse reflection and high-efficiency heat dissipation, so that the speckle effect of laser display is effectively weakened, and the reflection rotating wheel device can be widely applied to laserThe optical display device attenuates the laser speckle phenomenon.
Description
Technical Field
The invention relates to the technical field of laser display, in particular to a reflection rotating wheel device and application thereof in laser speckle elimination.
Background
The laser has the advantages of good directivity, good monochromaticity, high brightness, linear spectrum and the like, and is very suitable for being applied to the display field. Compared with other display technologies, laser projection display has the advantages of wide color gamut display, high color saturation, high color resolution, energy conservation, environmental protection and the like, and is considered as the next generation of mainstream display technology. However, due to the high coherence of the laser light, when the laser light is irradiated onto the surface of a rough object, the laser light interferes and is superimposed on the surface of the object to form a speckle phenomenon. The existence of speckle seriously affects the imaging quality of laser display, degrades the contrast and resolution of the image, and has become one of the main reasons for restricting and hindering the marketization of laser display. Therefore, in the field of laser display, eliminating laser speckle is a very important task. The existing reflection rotating wheel device cannot solve the laser speckle effect existing in laser display and cannot meet the requirement of high-power laser display.
In order to eliminate laser speckle, the prior art discloses a laser projection device, which comprises a laser light source, a driving modulation power supply, a reflecting rotating wheel and a rotation driving device, wherein the rotation driving device drives a rotating shaft of the reflecting rotating wheel to rotate; the outer peripheral surface of the reflection rotary wheel is provided with a reflection surface composed of various patterns. The laser projection device mainly solves the problems of low brightness and large chromatic aberration of laser projection by arranging the reflecting surface consisting of various patterns and adjusting the laser light source on the periphery of the laser reflection rotating wheel, and does not relate to the reduction of speckle effect existing in related laser display.
Disclosure of Invention
The invention aims to overcome the defects and differences of laser speckles in the existing laser display, and provides a reflection rotating wheel device which can effectively weaken the laser speckle phenomenon.
Another object of the present invention is to provide a reflective rotating wheel device for use in laser speckle reduction.
The above purpose of the invention is realized by the following technical scheme:
a reflection rotating wheel device is characterized in that the reflection rotating wheel device comprises a high heat conduction high reflection layer and a driving device, the high heat conduction high reflection layer is arranged on the upper surface of the driving device, the driving device drives the high heat conduction high reflection layer to rotate,
the diffuse reflection intensity of the high-thermal-conductivity high-reflection layer is more than or equal to 65%, and the thermal conductivity is more than or equal to 30W m-1K-1。
The high-thermal-conductivity high-reflection layer is high in reflectivity of 400-700nm, the thermal conductivity is about 30W m-1K-1, and the requirement of high-power laser display is met.
The action mechanism of the reflection rotating wheel device for weakening laser speckles is as follows:
when the laser beam irradiates the reflection rotating wheel device, on one hand, due to the high diffuse reflection intensity of the high heat conduction high reflection layer, a static random phase structure exists on the surface of the reflection rotating wheel, the laser generates Lambert reflection on the surface of the reflection rotating wheel to generate a plurality of reflected light beams with different angles, and the coherence of the laser is reduced; on the other hand, the high-speed rotation introduces a dynamic random phase structure, and the coherence of the laser is further reduced. The finally obtained light source has disordered phase and low coherence, thereby effectively weakening the speckle effect of laser display.
Preferably, the diffuse reflection intensity of the high-thermal-conductivity high-reflection layer is 80-92%. The higher the diffuse reflection intensity is, the better the corresponding laser speckle elimination effect is.
Preferably, the thickness of the high-thermal-conductivity and high-reflection layer is 10-40 μm.
Further preferably, the thickness of the high thermal conductivity and high reflection layer is 20-30 μm.
When the thickness of the reflecting material is 20-30 micrometers, the high-heat-conductivity high-reflection layer can ensure high reflectivity and high heat conductivity.
Preferably, the high-thermal-conductivity high-reflection layer comprises a high-reflection layer and a high-thermal-conductivity substrate layer from top to bottom, the high-reflection layer and the high-thermal-conductivity substrate layer are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
Among them, it should be noted that:
the high-heat-conductivity substrate layer can be a transparent sapphire sheet, and the high-reflection layer can be TiO2Or BaSO4The formed slurry layer was dispersed.
The specific preparation steps of the high thermal conductivity and high reflection layer can be referred to as follows:
s1, placing a high-reflection material, glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
and S3, repeating the step S2 to obtain the high-heat-conduction high-reflection layer with different thicknesses of the reflection material.
Preferably, the glass powder is one or more of silicate glass, borosilicate glass, phosphate glass and tellurite glass.
Further preferably, the glass frit is silicate glass and/or borosilicate glass.
When the glass powder is silicate glass and borosilicate glass, the reflectivity of the high-heat-conduction high-reflection layer is highest, and the high-reflection material and the high-heat-conduction substrate are compounded more firmly.
In another specific embodiment, the driving device may be a micro dc motor.
The high-heat-conductivity high-reflection layer is arranged on the upper surface of the driving device, in a specific implementation mode, the high-heat-conductivity high-reflection layer can be connected and arranged on the upper surface of the driving device through industrial glue, and the adopted industrial glue can be one or more of instant adhesive, epoxy glue, ultraviolet curing glue and the like.
The reflection rotating wheel device has the characteristics of high heat conduction and high reflection, reduces the coherence of laser so as to effectively weaken the speckle effect of laser display, has good laser speckle elimination effect and heat dissipation performance, can be widely applied to laser speckle elimination, and particularly protects the application of the reflection rotating wheel device in the laser speckle elimination.
Compared with the prior art, the invention has the beneficial effects that:
the reflecting rotating wheel device is simple, convenient and practical, and comprises the high-heat-conduction high-reflection layer and the driving device, the high-heat-conduction high-reflection layer can realize high-intensity diffuse reflection and high-efficiency heat dissipation, the static random phase structure on the surface of the reflecting rotating wheel is reflected, laser generates lambertian reflection rays at different angles on the surface of the reflecting rotating wheel, and the coherence of the laser is reduced; on the other hand, the driving device drives the reflection rotating wheel device to rotate at a high speed and introduces a dynamic random phase structure, so that the coherence of laser is further reduced, and finally the obtained light source is disordered in phase and low in coherence, so that the speckle effect of laser display is effectively weakened, and the device can be widely applied to a laser display device to weaken the laser speckle phenomenon.
Drawings
FIG. 1 is a schematic structural diagram of a reflective wheel device for reducing laser speckle
Fig. 2 is a laser speckle pattern obtained by a common reflector.
FIG. 3 is a laser speckle pattern without rotation for a reflective wheel apparatus for reducing laser speckle made in example 1.
FIG. 4 is a laser speckle pattern under rotation for a reflective wheel apparatus for reducing laser speckle made in example 1.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
Example 1
A reflection rotating wheel device for weakening laser speckle is shown in figure 1, the reflection rotating wheel device comprises a high heat conduction high reflection layer 1 and a driving device 2, the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, silicate glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 30 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 2
A reflection rotating wheel device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, borosilicate glass and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 30 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 3
A reflection rotating wheel device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, phosphate glass and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 30 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 4
A reflection rotating wheel device for weakening laser speckle comprises a high heat conduction high reflection layer 1 and a driving device 2, wherein the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, tellurate glass and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 30 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 5
A reflection rotating wheel device for weakening laser speckle is shown in figure 1, the reflection rotating wheel device comprises a high heat conduction high reflection layer 1 and a driving device 2, the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, silicate glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a high-heat-conduction high-reflection layer;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 10 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 6
A reflection rotating wheel device for weakening laser speckle is shown in figure 1, the reflection rotating wheel device comprises a high heat conduction high reflection layer 1 and a driving device 2, the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, silicate glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 20 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 7
A reflection rotating wheel device for weakening laser speckle is shown in figure 1, the reflection rotating wheel device comprises a high heat conduction high reflection layer 1 and a driving device 2, the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, silicate glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 25 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Example 8
A reflection rotating wheel device for weakening laser speckle is shown in figure 1, the reflection rotating wheel device comprises a high heat conduction high reflection layer 1 and a driving device 2, the high heat conduction high reflection layer 1 is arranged on the upper surface of the driving device 2, the driving device 2 drives the high heat conduction high reflection layer 1 to rotate,
the high-thermal-conductivity high-reflection layer 1 comprises a high-reflection layer 101 and a high-thermal-conductivity substrate layer 102 from top to bottom, the high-reflection layer 101 and the high-thermal-conductivity substrate layer 102 are formed by sintering and bonding, and glass powder is used as a bonding agent in the sintering process.
The driving device 2 is a micro direct current motor, and the high heat conduction and high reflection layer 1 is combined with the micro direct current motor by using industrial glue.
The preparation method comprises the following steps:
s1, placing a high-reflection material, silicate glass powder and an organic dispersant in a mortar, and fully grinding and mixing to prepare slurry;
s2, uniformly printing the slurry on a transparent sapphire sheet through a silk screen; sintering at high temperature in a muffle furnace; cooling and taking out to obtain a composite material;
s3, repeating the step S2 for three times to obtain a high-heat-conductivity high-reflection layer with the thickness of the reflection material being about 40 mu m;
and S4, bonding the high-thermal-conductivity high-reflection layer with the micro direct-current motor by using industrial glue epoxy glue to obtain the reflection rotating wheel device.
Result detection
(1) Diffuse reflectance Spectroscopy testing
The test was completed using a Cary-5000 uv-vis-nir spectrophotometer. The test range is 400-700 nm.
Firstly, testing the diffuse reflection of a reference sample (the test selects the total-reflection barium sulfate powder) in a corresponding wave band, and then testing the diffuse reflection of the sample in the corresponding wave band to finally obtain the diffuse reflection spectrum. And selecting the diffuse reflection intensity at 450nm as a standard to compare results.
The detection results are shown in Table 1
TABLE 1. examples diffuse reflectance intensity at 450nm
| Diffuse reflection intensity (%) | Diffuse reflection intensity (%) | ||
| Example 1 | 91.5 | Example 5 | 65.3 |
| Example 2 | 90.5 | Example 6 | 90.1 |
| Example 3 | 82.0 | Example 7 | 89.4 |
| Example 4 | 78.9 | Example 8 | 85.3 |
As can be seen from the data in table 1, the high thermal conductivity and high reflection layer of the reflective wheel device of the present invention has a higher diffuse reflection intensity, which can be up to 91.5%, and the higher diffuse reflection intensity of the high thermal conductivity and high reflection layer is more favorable for obtaining a laser light source with a disordered phase and a lower coherence when the laser beam is irradiated, so as to reduce the speckle effect of laser display.
As can be seen from examples 1 to 4, the type of the glass frit has a great influence on the diffuse reflection intensity of the sample. When the glass powder is silicate glass and borosilicate glass, the diffuse reflection intensity of the sample is better.
As can be seen from examples 5 to 8, the thickness of the reflective material has a great influence on the diffuse reflection intensity of the sample. When the thickness of the reflecting material is 20-30 micrometers, the diffuse reflection intensity of the sample is better.
(2) Laser speckle testing
The speckle contrast is obtained by testing the laser speckle pattern with a laser speckle tester SM01VS09 SERIES.
Fig. 2 is a laser speckle pattern of a conventional reflective wheel device (without a highly thermally conductive and highly reflective layer). It can be seen that the speckle phenomenon is very severe, and the tested speckle contrast is 9%.
FIG. 3 is a laser speckle pattern without rotation for a reflective wheel apparatus for reducing laser speckle made in example 1. It can be seen that compared with fig. 2, the speckle phenomenon is greatly improved, and the tested speckle contrast is 2.4%.
FIG. 4 is a laser speckle pattern under rotation for a reflective wheel apparatus for reducing laser speckle made in example 1. It can be seen that compared with fig. 3, the speckle phenomenon is further suppressed, and the tested speckle contrast is 2.2%.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A reflection rotating wheel device is characterized by comprising a high-heat-conductivity high-reflection layer (1) and a driving device (2), wherein the high-heat-conductivity high-reflection layer (1) is arranged on the upper surface of the driving device (2), the driving device (2) drives the high-heat-conductivity high-reflection layer (1) to rotate,
the diffuse reflection intensity of the high-thermal-conductivity high-reflection layer is more than or equal to 65%, and the thermal conductivity is more than or equal to 30W m-1K-1。
2. The reflective wheel apparatus according to claim 1, wherein the high thermal conductivity and high reflectivity layer (1) has a diffuse reflection intensity of 80-92%.
3. The reflective wheel apparatus according to claim 1, wherein the highly heat conductive and highly reflective layer (1) has a thickness of 10 to 40 μm.
4. The reflective wheel apparatus according to claim 3, wherein the highly heat conductive and highly reflective layer (1) has a thickness of 20 to 30 μm.
5. The reflective wheel device according to claim 1, wherein the highly heat conductive and highly reflective layer (1) comprises a highly reflective layer (101) and a highly heat conductive substrate layer (102) from top to bottom, the highly reflective layer (101) and the highly heat conductive substrate layer (102) are formed by sintering and bonding, and glass powder is used as a bonding agent during sintering.
6. The reflective wheel apparatus of claim 5, wherein the glass powder is one or more of silicate glass, borosilicate glass, phosphate glass, and tellurate glass.
7. The reflective wheel apparatus of claim 6, wherein said glass frit is a silicate glass and/or a borosilicate glass.
8. The reflective wheel assembly of claim 1, wherein said drive means (2) is a micro dc motor.
9. The reflective wheel assembly of claim 1, wherein the highly heat conductive and highly reflective layer (1) is attached to the upper surface of the driving means (2) by industrial glue.
10. Use of a reflective wheel assembly as claimed in any one of claims 1 to 9 for laser speckle reduction.
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