CN103955068A - Laser projector speckle-eliminating device - Google Patents
Laser projector speckle-eliminating device Download PDFInfo
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- CN103955068A CN103955068A CN201110461752.4A CN201110461752A CN103955068A CN 103955068 A CN103955068 A CN 103955068A CN 201110461752 A CN201110461752 A CN 201110461752A CN 103955068 A CN103955068 A CN 103955068A
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Abstract
The invention discloses a laser projector speckle-eliminating device. An output end of a red-green-blue three-color semiconductor laser device is provided with a first fly-eye lens, a fly-eye lens assembly and a decoherence rotation wheel. The decoherence rotation wheel rotates in high speed under the driving of a motor. The fly-eye lens includes a metal light-shielding plate, a fly-eye lens and a PCS polarization splitting prism. Light emitted from the fly-eye lens assembly is efficiently converted into S polarized light. The S polarized light is spread forwards and passes the decoherence rotation wheel, and the decoherence rotation wheel rotates in high speed so that phases of different positions on the laser spots are all different and thus an objective of decoherence is achieved. Three-primary-color laser after the decoherence enters three corresponding red, green and blue light valves. The device eliminates a speckle phenomenon on the screen, improves the picture quality of laser display and improves the watching comfort of audiences.
Description
Technical field
The invention belongs to display technique field, the front projection that the is specifically related to a kind of laser projection speckle device that disappears.
Background technology
Using laser is an important component part of following main flow projection display apparatus as the projector of light source.Utilize laser to do its advantage of projection light source to be: 1, the life-span long, at room temperature the life-span can reach 100000h; 2, due to the high color purity of laser, the color reducibility of laser projection is good, and it is much larger that the colour gamut of laser display shows than light-emitting phosphor, and the image color that laser display technology shows is abundanter; While 3, using laser as projection light source, its optical system can not need colour splitting system, and without lens focus, so projected image can not produce distortion or distortion yet.But, use laser also fairly obvious as the shortcoming of light source, this shortcoming is exactly speckle phenomena.Speckle phenomena refers to when human eye is watched the image on screen, and human eye can feel to be a mass of on screen little shining point close and numerously, and can feel dizzy.The interventionist nature that in this essence of phenomena is laser causes, and speckle phenomena has had a strong impact on the performance of laser projection.
In laser display long-run development process, many researchers all once propose to suppress a lot of methods of speckle, as utilize the light source of different wave length, and single fiber or fibrous bundle illumination etc. reduces laser coherence, thereby weakens speckle; Utilize the methods such as vibration of the stack of pulse laser, mobile scatterer, mobile aperture diaphragm, ultrasound wave, screen to reduce speckle.These methods are all by reducing time or the spatial coherence of laser, and suppress speckle under Near Field., in laser display, these methods are to be difficult to change time of laser or spatial coherence under the prerequisite that guarantees laser power and beam quality.
Summary of the invention
The above-mentioned defect existing for solving prior art, the object of the present invention is to provide a kind of long-life, high brightness, and rich color, high definition, without the laser projection of the speckle phenomena speckle device that disappears.
For achieving the above object, the technical solution used in the present invention is: this laser projection speckle device that disappears, it is characterized in that: red, green, the output terminal of blue three look semiconductor lasers is respectively equipped with first fly's-eye lens, fly's-eye lens assembly and eliminating coherence runner, described eliminating coherence runner drives High Rotation Speed by motor, described fly's-eye lens is by metal shadow shield, fly's-eye lens and PCS polarization splitting prism form, from fly's-eye lens assembly light Efficient Conversion out, it is S polarized light, S polarized light is propagated forward through eliminating coherence runner, eliminating coherence runner High Rotation Speed, make the phase place of each position on laser facula all not identical, reach the object of eliminating coherence, tricolor laser after eliminating coherence incides corresponding red, green, in blue 3 light valves.
Described eliminating coherence runner is made by the extraordinary glass material of light transmission features.
Described light valve is DMD, LCD panel or LCOS panel, is added with coloured image modulating signal circuit on light valve.
Adopt the beneficial effect of technique scheme: this laser projection speckle device that disappears is comprised of first fly's-eye lens, second fly's-eye lens, PCS polarization splitting prism, eliminating coherence runner, and coordinates reflective mirror, light valve (ruddiness light valve, green glow light valve and blue light light valve), color-combination prism and projection lens to form laser projection dissipation spot optical projection system.After laser enters projector, through first fly's-eye lens, being focused on fly's-eye lens assembly, is S polarized light from fly's-eye lens assembly light Efficient Conversion out, compares with polaroid mode, and the capacity usage ratio of light doubles.S polarized light is propagated forward through eliminating coherence runner, and eliminating coherence runner is the most important device of this device, and he is made by transparent material in uneven thickness, under the drive of motor, runner High Rotation Speed, thus it is all not identical to realize the phase place of each position on laser facula, reaches the object of eliminating coherence.Tricolor laser after eliminating coherence incides in 3 light valves of corresponding red, green, blue, light valve can be DMD, LCD panel or LCOS panel, on light valve, be added with coloured image modulation signal, red, green, blue three look laser are after light valve (reflected by light valve or see through), there is variation in luminous flux, thereby become red, green, blue image light signals, red, green, blue three look laser image light signals enter after X prism color, incide projection lens, then project and on screen, obtain laser display image by projecting lens.
The generation condition of interference of light is: only have two row light wave frequencies identical, phasic difference is constant, and the coherent source that direction of vibration is consistent could produce interference of light.So destroy interference of light as long as of destroying in these three conditions just can destroy interference of light.The light of laser instrument output, wave spread is very narrow, and light frequency is identical.Take output ruddiness helium-neon laser be example, its light wavelength distribution range can be too narrow to 2 * 10
-9nanometer.This shows the laser that a laser instrument sends, its frequency is identical, and cannot change sharp light frequency, so first condition cannot be destroyed.The laser of laser instrument transmitting, is exactly innately that the divergence of light beam is minimum, approximately only has 0.001 radian towards a direction ejaculation, approaches parallelly, and due to shear wave only, thereby it is consistent to derive the direction of vibration of laser, and the 3rd condition also cannot be destroyed.The phasic difference of laser is also constant, and the present invention changes the phasic difference of laser by optical device, so second condition can be destroyed.The core eliminating coherence device using in the present invention is eliminating coherence runner, and this runner is made by the extraordinary glass material of light transmission features, its distribution in uneven thickness.This runner drives rapidly rotation by direct current generator.The principle of work of this eliminating coherence device is: when runner rapidly rotates, be irradiated to laser on runner through in the process of runner, in uneven thickness due to runner, and the refractive index of glass material is greater than 1, so the bit phase delay degree of laser beam is all not identical, destroyed second condition interfering, the phase difference constant of ascending the throne, thus realized the object of eliminating coherence, eliminated the speckle phenomena on screen, improve the image quality of laser display, promoted spectators' the comfort level of viewing and admiring.
The significant advantage of comparing this eliminating coherence device with eliminating coherence method is in the past:
1. eliminating coherence is in the past scarcely real eliminating coherence, but utilizes the integrating effect of human eye to light, makes the existence of the imperceptible speckle of people.This device has fundamentally destroyed the condition that laser interferes, and is genuine eliminating coherence.
2. analyze theoretically, the effect of the eliminating coherence of this device is very good.The character of analyzing interference fringe from physics is determined by formula below.
From formula above, can find out when phasic difference is integer wavelength, be bright fringes on screen, when odd-multiple that phasic difference is half-wavelength, is dark fringe on screen.Because eliminating coherence runner is in uneven thickness, and runner is at High Rotation Speed, so the wavelength difference of a certain position all the time among changing, can not form obvious speck or blackening, so speckle phenomena has just disappeared on screen.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, specific embodiment of the invention is described in further detail.
Fig. 1 is eliminating coherence rotaring wheel structure schematic diagram.
Tu2Wei projector of the present invention inner body structural drawing.
Embodiment
The speckle device that disappears of laser projection as shown in Figure 1, 2, output terminal at red, green, blue three look semiconductor lasers 1,2,3 consists of first fly's-eye lens 4, fly's-eye lens assembly 5 and eliminating coherence runner 6 successively, and coordinates reflective mirror M1, M2, light valve 8 (ruddiness light valve, green glow light valve and blue light light valve), color-combination prism 9 and projection lens 10 to form laser projection dissipation spot optical projection system.Fly's-eye lens assembly is comprised of metal shadow shield, fly's-eye lens and polarization splitting prism PCS.Described eliminating coherence runner drives High Rotation Speed by motor.
After laser enters projector, through first fly's-eye lens 4, being focused on fly's-eye lens assembly 5, is S polarized light from fly's-eye lens assembly light Efficient Conversion out, compares with polaroid mode, and the capacity usage ratio of light doubles.S polarized light is propagated forward through eliminating coherence runner, and eliminating coherence runner is the most important device of this device, and he is made by transparent material in uneven thickness, under the drive of motor, runner High Rotation Speed, thus it is all not identical to realize the phase place of each position on laser facula, reaches the object of eliminating coherence.Tricolor laser after eliminating coherence incides in 3 light valves of corresponding red, green, blue, light valve can be DMD, LCD panel or LCOS panel, on light valve, be added with coloured image modulating signal circuit, red, green, blue three look laser are after light valve (reflected by light valve or see through), there is variation in luminous flux, thereby become red, green, blue image light signals, red, green, blue three look laser image light signals enter after X prism color, incide projection lens, then project and on screen, obtain laser display image by projecting lens.
Claims (3)
1. the laser projection speckle device that disappears, it is characterized in that: red, green, the output terminal of blue three look semiconductor lasers is respectively equipped with first fly's-eye lens, fly's-eye lens assembly and eliminating coherence runner, described eliminating coherence runner drives High Rotation Speed by motor, described fly's-eye lens is by metal shadow shield, fly's-eye lens and PCS polarization splitting prism form, from fly's-eye lens assembly light Efficient Conversion out, it is S polarized light, S polarized light is propagated forward through eliminating coherence runner, eliminating coherence runner High Rotation Speed, make the phase place of each position on laser facula all not identical, reach the object of eliminating coherence, tricolor laser after eliminating coherence incides corresponding red, green, in blue 3 light valves.
2. the laser projection according to claim 1 speckle device that disappears, is characterized in that: described eliminating coherence runner is made by the extraordinary glass material of light transmission features.
3. the laser projection according to claim 1 speckle device that disappears, is characterized in that: described light valve is DMD, LCD panel or LCOS panel, is added with coloured image modulating signal circuit on light valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110461752.4A CN103955068A (en) | 2011-12-30 | 2011-12-30 | Laser projector speckle-eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110461752.4A CN103955068A (en) | 2011-12-30 | 2011-12-30 | Laser projector speckle-eliminating device |
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| Publication Number | Publication Date |
|---|---|
| CN103955068A true CN103955068A (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110461752.4A Pending CN103955068A (en) | 2011-12-30 | 2011-12-30 | Laser projector speckle-eliminating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181937A (en) * | 2017-07-31 | 2017-09-19 | 歌尔股份有限公司 | Image projecting method and device |
| CN110308608A (en) * | 2018-03-27 | 2019-10-08 | 精工爱普生株式会社 | Optical unit and display device |
| CN111308840A (en) * | 2018-11-23 | 2020-06-19 | 中强光电股份有限公司 | Illumination system and projection device |
-
2011
- 2011-12-30 CN CN201110461752.4A patent/CN103955068A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107181937A (en) * | 2017-07-31 | 2017-09-19 | 歌尔股份有限公司 | Image projecting method and device |
| CN110308608A (en) * | 2018-03-27 | 2019-10-08 | 精工爱普生株式会社 | Optical unit and display device |
| CN111308840A (en) * | 2018-11-23 | 2020-06-19 | 中强光电股份有限公司 | Illumination system and projection device |
| CN111308840B (en) * | 2018-11-23 | 2021-10-01 | 中强光电股份有限公司 | Illumination system and projection device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140730 |