CN105301793A - Speckle removing device of laser display - Google Patents
Speckle removing device of laser display Download PDFInfo
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- CN105301793A CN105301793A CN201510689758.5A CN201510689758A CN105301793A CN 105301793 A CN105301793 A CN 105301793A CN 201510689758 A CN201510689758 A CN 201510689758A CN 105301793 A CN105301793 A CN 105301793A
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- 239000004065 semiconductor Substances 0.000 claims description 10
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- 230000010354 integration Effects 0.000 abstract description 7
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- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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Abstract
The invention discloses a speckle removing device of laser display, and relates to the technical field of laser display. The device comprises laser sources and optical components, at least part of the optical components is placed in the light extraction directions of the laser sources, the optical components of transmission type are rotatable, and comprise uneven laser incidence planes respectively, and when the optical components rotate, laser beams emitted by the laser sources continuously pass the laser incidence planes. The rotary optical components are additionally arranged behind the laser sources to change the spatial coherence of laser, enable speckle to overlap continuously in the integration time, reduce the contact of speckles, and weaken the speckles. In addition, the laser sources are constant in the speckle removing process, so that the speckles can be effectively removed on the premise that the laser power and quality of laser beams are ensured, and the display quality is improved.
Description
Technical Field
The invention relates to the technical field of laser display, in particular to a laser display speckle removing device.
Background
Laser display is a new generation technology following black and white display, color display and digital display, is called as the revolution in human visual history, and with the increasing maturity of laser display technology, the laser display technology will become the mainstream of high-end display in the future due to the characteristics of wide color gamut range, long service life, high reliability, energy conservation, environmental protection and the like. The laser display technology uses red, green and blue lasers as light sources, the red, green and blue lasers are respectively subjected to beam expansion, shimming and decoherence and then are incident on corresponding light valves, image modulation signals are added on the light valves, the modulated three-color lasers are incident on a projection objective after color combination by an X prism, and finally the modulated three-color lasers are projected on a screen through the projection objective to obtain laser display images.
Because the high coherence of the laser can generate the self-coherence effect, when the laser irradiates on the surface of a rough object, interference fringes are generated in the diffuse reflection process, and because the interference distribution is determined along with the determination of a plane, a granular pattern with high contrast and fine size, namely speckles, is formed in the space, so that the imaging quality is seriously limited, the resolution and the contrast of an image are reduced, the three-dimensional display and the naked eye display have serious crosstalk and the like, and the wide application and popularization of the laser display are limited. The existing methods for suppressing speckles in laser display generally adopt light sources with different wavelengths for illumination, and utilize pulse laser superposition and other modes.
Although the conventional methods have a certain effect of reducing the contrast of the speckles and reducing the influence of the speckles, the methods are all realized by changing the laser light source, so that the power of the emitted laser and the quality of the light beam are difficult to ensure, and the final display effect is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem of can't eliminate laser display speckle under the prerequisite of guaranteeing laser power and light beam quality among the prior art is solved.
To achieve the above object, the present invention provides a laser display speckle removing apparatus, comprising: the laser device comprises a laser light source and an optical element, wherein at least one part of the optical element is positioned in the light emitting direction of the laser light source;
wherein,
the optical element is a rotatable, transmissive optical element;
the optical element further includes a rugged laser light entrance face;
when the optical element rotates, the laser beam emitted by the laser light source continuously passes through the laser light incidence surface.
Preferably, the laser incident surface comprises a plurality of grooves which are adjacently arranged;
wherein the depth of two adjacent grooves is different.
Preferably, the width of the plurality of grooves is the same, being in the order of ten times the wavelength of the laser beam.
Preferably, the optical element is a circular sheet structure, and the laser incident surface is a surface of the circular sheet;
the optical element rotates by taking a straight line perpendicular to the surface of the circular sheet as an axis, and the axis is parallel to but not coincident with the optical path of the laser beam.
Preferably, the optical element is a tubular structure with a circular cross section, and the laser entrance surface is an inner surface of the tubular structure;
the laser light source is positioned inside the tubular structure, and the light emitting direction is the radial direction of the tubular structure;
the optical element rotates with a straight line in the axial direction of the tubular structure as an axis.
Preferably, the optical element rotates at a speed of 10000 r/min.
Preferably, a light screen is also included;
the optical screen is positioned in the light emitting direction of the laser light source and used for displaying an image of the laser beam after passing through the optical element.
Preferably, the laser light source is one or more of a red semiconductor laser, a green semiconductor laser, and a blue semiconductor laser.
The invention provides a laser display speckle removing device. The space coherence of the laser is changed by additionally arranging a rotating optical element behind the light source, so that speckles are continuously superposed in the integration time, the speckle contrast is continuously reduced, and the speckles are finally removed. In addition, the invention only adds an optical element behind the original laser light source, and the laser light source is constant in the process of removing the speckles, so the invention can effectively remove the speckles on the premise of ensuring the laser power and the beam quality and improve the display quality.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a laser display speckle removal apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a laser incident surface according to a first embodiment of the invention;
FIG. 3 is a schematic diagram of a laser display speckle removal apparatus according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a laser display speckle removal apparatus according to a third embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the present invention provides a laser display speckle removal apparatus. The device specifically includes: the laser light source 11, 21, 31, and the optical element 12, 22, 32, at least a part of which is located in the light emitting direction of the laser light source. Wherein the optical elements 12, 22, 32 are rotatable, transmissive optical elements; the optical element 12, 22, 32 further includes a rugged laser light entrance face 13, 23, 33; when the optical elements 12, 22, 32 rotate, the laser beams emitted by the laser light sources 11, 21, 31 continuously pass through the laser entrance surfaces 13, 23, 33; finally, the screener 14, 24, 34 will present an image of the laser beam after it has passed through the optical element 12, 22, 32. The laser display speckle removing device provided by the invention is explained in detail below.
Example one
As shown in fig. 1, the present embodiment provides a laser display speckle removal apparatus, including: a laser light source 11 and an optical element 12 positioned in the light exit direction of the laser light source 11. The surface of the optical element 12 facing the laser light source 11 is a laser light entrance surface 13. Furthermore, the device preferably comprises a light screen 14, preferably a white screen, arranged in the light exit direction. The light screen 14 is located on the side of the optical element 12 remote from the laser light source 11. Preferably, the laser light source 11 is one or more of a red semiconductor laser, a green semiconductor laser, and a blue semiconductor laser. Correspondingly, the wavelengths of each semiconductor laser are 671nm, 532nm and 473nm respectively; the power is 3.5W, 0.32W or 1.3W, respectively.
As shown in fig. 2, the laser incident surface 13 further includes several grooves disposed adjacently, and the grooves are preferably etched grooves formed by an etching process. Wherein, the depth of a plurality of grooves is different, so that the laser incident surface 13 is in a convex-concave shape. Preferably, the width of the plurality of grooves is the same, being in the order of ten times the wavelength of the laser beam.
When the laser beam emitted from the laser light source 11 is speckle-removed, the optical element 12 rotates at a high speed, preferably at 10000r/min, around a straight line perpendicular to the laser light incident surface 13 as an axis under the action of external force. The laser beam is emitted from the laser light source 11 and enters the laser light entrance surface 13 of the optical element 12. Since the surface of the laser light incident surface 13 is rugged and in a state of rotating at a high speed, the optical path of the incident laser beams is changed, thereby eliminating spatial coherence between the laser beams. Finally, the laser beam with the changed optical path is irradiated on the optical screen 14 to form a different speckle pattern. Based on the integration effect of the human eye on light, the speckle structure will be continuously superimposed on the light screen 14 during an integration period, so that the contrast of the speckle gradually decreases. When the speckle contrast is reduced to below 4%, human eyes can not recognize the speckles, so that the purpose of eliminating the laser display speckles is achieved. In addition, in this embodiment, only the optical element 12 is added behind the laser light source 11, and the laser light source 11 is kept constant in the process of removing the speckles, so that the laser power and the beam quality are also kept constant, and therefore, the embodiment can eliminate the speckles in laser display on the premise of ensuring the laser power and the beam quality, and thus the display quality is improved.
Example two
As shown in fig. 3, the present embodiment is substantially the same as the first embodiment, except that the optical element 22 in the present embodiment is a circular sheet structure, wherein the surface of the circular sheet structure is a laser light incident surface 23.
When the laser beam emitted from the laser light source 21 is speckle-removed, the optical element 22 is rotated at a high speed, preferably at 10000r/min, by an external force, preferably with a straight line perpendicular to the laser light incident surface 23 as an axis. Wherein the axis is parallel to the laser beam, such that the optical element 22 rotates at a high speed in a manner perpendicular to the laser beam. The laser beam whose optical path is changed by the optical element 22 is irradiated on the optical screen 24, and in an integration period of a human eye, the speckle structures are continuously superposed to gradually reduce the contrast of the speckles, and when the contrast of the speckles is reduced to below 4%, the human eye can not recognize the speckles, so that the speckles in the laser display are effectively eliminated.
It should be understood that the optical element in the present invention is not limited to the circular sheet structure provided in the present embodiment, but may be other structures such as square sheets, diamond sheets, and the like. When the optical element rotates at a high speed, the optical element is not only limited to be perpendicular to the laser beam, but also can form a certain included angle with the laser beam. The present invention can be implemented as long as the laser beam can be made to continuously pass through the laser light entrance surface while the optical element is rotated at high speed.
EXAMPLE III
As shown in fig. 4, the present embodiment is also substantially the same as the first embodiment, except that the optical element 32 in the present embodiment is a tube-shaped structure with a circular cross section, wherein the inner surface of the tube-shaped structure is a laser light incident surface 33. The laser source 31 is located inside the tube structure, and the light emitting direction of the laser source 31 is perpendicular to the axial direction of the tube structure, so that only a part of the optical element 32 is located in the light emitting direction of the laser source 31.
When the speckle of the laser beam emitted by the laser source 31 is removed, the optical element 32 rotates at a high speed by taking the straight line of the tubular structure in the axial direction as an axis under the action of external force, and the rotating speed of the optical element is preferably 10000 r/min. Wherein the axis is perpendicular to the laser beam, such that the optical element 32 rotates at a high speed while maintaining a shape parallel to the laser beam. The laser beam whose optical path is changed by the optical element 32 is irradiated on the optical screen 34, in an integration period of human eyes, the speckle structure is continuously superposed to gradually reduce the contrast ratio of the speckles, and when the contrast ratio of the speckles is reduced to below 4%, the human eyes can not identify the speckles, thereby effectively eliminating the speckles in the laser display.
It should also be understood that the optical element in the present invention is not limited to the tube-shaped structure with a circular cross section provided in the present embodiment, but may also be other structures, such as a tube-shaped structure with an oval cross section, a tube-shaped structure with an asymmetric upper bottom surface and a lower bottom surface, and so on. When the optical element rotates at a high speed, the optical element is not only limited to be parallel to the laser beam, but also can form a certain included angle with the laser beam. The present invention can be implemented as long as the laser light source can be surrounded so that the laser beam continuously passes through the laser light entrance surface when the optical element is rotated at high speed.
In summary, the present invention provides a laser speckle removal device for displaying. The space coherence of the laser is changed by additionally arranging a rotating optical element behind the light source, so that speckles are continuously superposed in the integration time, the speckle contrast is continuously reduced, and the speckles are finally removed. In addition, the invention only adds an optical element behind the original laser light source, and the laser light source is constant in the process of removing the speckles, so the invention can effectively remove the speckles on the premise of ensuring the laser power and the beam quality and improve the display quality.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (8)
1. A laser display speckle removal apparatus, comprising: the laser device comprises a laser light source and an optical element, wherein at least one part of the optical element is positioned in the light emitting direction of the laser light source;
wherein,
the optical element is a rotatable, transmissive optical element;
the optical element further includes a rugged laser light entrance face;
when the optical element rotates, the laser beam emitted by the laser light source continuously passes through the laser light incidence surface.
2. The laser-display speckle removal apparatus of claim 1, wherein the laser entrance surface comprises a plurality of grooves arranged adjacently;
wherein the depth of two adjacent grooves is different.
3. The laser-display speckle removal apparatus of claim 2, wherein the plurality of grooves have the same width, on the order of ten times the wavelength of the laser beam.
4. The laser-display speckle removal apparatus of claim 1, wherein the optical element is a circular flake structure, and the laser entrance surface is a surface of the circular flake;
the optical element rotates by taking a straight line perpendicular to the surface of the circular sheet as an axis, and the axis is parallel to but not coincident with the optical path of the laser beam.
5. The laser-display speckle removal apparatus of claim 1, wherein the optical element is a tubular structure having a circular cross section, and the laser entrance surface is an inner surface of the tubular structure;
the laser light source is positioned inside the tubular structure, and the light emitting direction is the radial direction of the tubular structure;
the optical element rotates with a straight line in the axial direction of the tubular structure as an axis.
6. The laser-display speckle removal apparatus of claim 1, wherein the optical element rotates at a speed of 10000 r/min.
7. The laser-display speckle removal apparatus of claim 1, further comprising a light screen;
the optical screen is positioned in the light emitting direction of the laser light source and used for displaying an image of the laser beam after passing through the optical element.
8. The laser-display speckle removal apparatus of any one of claims 1 to 7, wherein the laser light source is one or more of a red semiconductor laser, a green semiconductor laser, and a blue semiconductor laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510689758.5A CN105301793A (en) | 2015-10-22 | 2015-10-22 | Speckle removing device of laser display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510689758.5A CN105301793A (en) | 2015-10-22 | 2015-10-22 | Speckle removing device of laser display |
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| CN105301793A true CN105301793A (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510689758.5A Pending CN105301793A (en) | 2015-10-22 | 2015-10-22 | Speckle removing device of laser display |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254415A (en) * | 2018-10-31 | 2019-01-22 | 四川长虹电器股份有限公司 | The laser of engraving external diffusion disappears speckle device in a kind of multidimensional |
| CN112494136A (en) * | 2020-12-16 | 2021-03-16 | 刘奇为 | Superfine endoscope system with laser and illumination light sharing optical fiber and light source generating device |
| WO2021210260A1 (en) * | 2020-04-14 | 2021-10-21 | ソニーグループ株式会社 | Optical element, illumination device, and projection-type display device |
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| EP0479490A2 (en) * | 1990-10-02 | 1992-04-08 | Physical Optics Corporation | Volume holographic diffuser |
| US20120218615A1 (en) * | 2011-02-24 | 2012-08-30 | Stanley Electric Co., Ltd. | Light scattering element, optical scanning device, and image displaying device |
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN103869474A (en) * | 2012-12-17 | 2014-06-18 | 财团法人工业技术研究院 | Light beam generating device |
| CN104965307A (en) * | 2015-07-28 | 2015-10-07 | 山东大学 | Device and method being capable of achieving light beam shaping dodging and speckle eliminating at the same time |
-
2015
- 2015-10-22 CN CN201510689758.5A patent/CN105301793A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0479490A2 (en) * | 1990-10-02 | 1992-04-08 | Physical Optics Corporation | Volume holographic diffuser |
| US20120218615A1 (en) * | 2011-02-24 | 2012-08-30 | Stanley Electric Co., Ltd. | Light scattering element, optical scanning device, and image displaying device |
| CN103869474A (en) * | 2012-12-17 | 2014-06-18 | 财团法人工业技术研究院 | Light beam generating device |
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN104965307A (en) * | 2015-07-28 | 2015-10-07 | 山东大学 | Device and method being capable of achieving light beam shaping dodging and speckle eliminating at the same time |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254415A (en) * | 2018-10-31 | 2019-01-22 | 四川长虹电器股份有限公司 | The laser of engraving external diffusion disappears speckle device in a kind of multidimensional |
| CN109254415B (en) * | 2018-10-31 | 2020-07-28 | 四川长虹电器股份有限公司 | Laser speckle eliminating device for multi-dimensional inner engraving and outer diffusion |
| WO2021210260A1 (en) * | 2020-04-14 | 2021-10-21 | ソニーグループ株式会社 | Optical element, illumination device, and projection-type display device |
| CN112494136A (en) * | 2020-12-16 | 2021-03-16 | 刘奇为 | Superfine endoscope system with laser and illumination light sharing optical fiber and light source generating device |
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