CN105301792A - Laser speckle inhibition method - Google Patents
Laser speckle inhibition method Download PDFInfo
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- CN105301792A CN105301792A CN201510689745.8A CN201510689745A CN105301792A CN 105301792 A CN105301792 A CN 105301792A CN 201510689745 A CN201510689745 A CN 201510689745A CN 105301792 A CN105301792 A CN 105301792A
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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
Abstract
The invention discloses a laser speckle inhibition method, and relates to the technical field of laser display. The method comprises that multiple laser units are arranged in an array form with the same light output direction to form an array laser source; multiple laser units are selected from the array laser source as a first laser unit group, and other laser units form a second laser unit group; the first laser unit group is changed from the first brightness to the second brightness and then to the first brightness; and when the first laser unit group reaches the second brightness, the second laser unit group is changed from the first brightness to the second brightness and then to the first brightness. According to the method, multiple separate laser units emit light alternatively, the difference of the amplitude of adjacent laser units is large, the contrast of speckles gradually reduces, and the speckles are eliminated finally.
Description
Technical field
The present invention relates to technical field of laser display, particularly relate to a kind of method suppressing laser speckle.
Background technology
The picture that people show video in recent years requires to improve constantly, and constantly pursues the exquisiteness of picture and gorgeous, and this just requires that display device can present the image of color more horn of plenty.In the light source of numerous display device, laser has that monochromaticity is good, directivity is high because of it and brightness advantages of higher is widely used as the light source of display device.The spectrum line of laser is line spectrum line, and color-resolution is high, and color saturation is high, can show very clear and chromatic colour.The alternative spectral line of laser is a lot, has more ripe laser instrument, can form large colour gamut chromatic triangle like this, thus can press close to the colour gamut sensing region of human eye most from 400nm to 700nm.Meanwhile, it is long that laser display technology also has the life-span, therefore receives increasing concern without advantages such as harmful electromagnetic x radiation xs.
But we are except can seeing the image of display on the screen of laser display, many light and dark, granular speckles can also be seen.The generation of speckle is the coherence stack due to laser a certain position i.e. screen in the middle of space, is added by the optical wavelength complex amplitude that multiple phase place is random.Because the graininess distribution of these speckles causes image information content excalation, reduce the resolution of image, the serious viewing quality affecting laser display.Only have and speckle contrast is suppressed to less than 4%, human eye just cannot differentiate speckle.
The method of speckle is suppressed to have in prior art multiple, as rotating light nanofarads, control laser resonance cell method, vibrations screen method, many fiber beam splittings method, ultrasonic grating dissipation spot, carry out phase-modulation suppression speckle etc. by rotation phase plate, but existing method needs the process through eliminating coherence element after laser beam outgoing, make the efficiency of light energy utilization greatly impaired, reduce the quality of light beam, be difficult to be applied in the display of laser television.
Summary of the invention
The technical problem to be solved in the present invention is: the problem how effectively suppressing speckle under the prerequisite ensureing beam quality.
For realizing above-mentioned goal of the invention, the invention provides a kind of method of laser speckle that suppresses and comprising:
Multiple laser cell is arranged with the form of array, and light direction identical formation array laser light source;
Choosing several laser cells in described array laser light source is the first laser cell group, and remaining laser cell is the second laser cell group;
Control described first laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness; When described first laser cell group reaches the second brightness, control described second laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness;
Wherein, described first laser cell group is identical with the cycle that the second laser cell group changes;
The laser cell number of described first laser cell group is identical with the laser cell number of the second laser cell group or differ one.
Wherein more preferably, described first laser cell group and the second laser cell group by the first brightness be changed to the second brightness again the second brightness be changed to the first brightness, be even variation.
Wherein more preferably, described in choose several laser cells in described array laser light source be the first laser cell group, be by described array laser light source often the interval that puts in order of row laser cell choose.
Wherein more preferably, described in choose in described array laser light source several laser cell light emitting step, several laser cells in described array laser light source are controlled by the electric signal of change.
Wherein more preferably, the change of the described first laser cell group of described control and the first laser cell group is that the electric signal being triangular pulse by form controls;
Wherein, the pulse height of described triangular pulse is 5A, and pulse width is 8ms, and pulse rise time and fall time are 4ms.
Wherein more preferably, described in multiple laser cell is arranged with the form of array, be what to make multiple laser cell with the even arrangement of array.The invention provides a kind of method suppressing laser speckle.Wherein, the method is alternately luminous by the multiple laser cell light and shades in array laser light source when ensureing that total light intensity is constant, amplitude between adjacent laser unit is differed greatly, the contrast of speckle is reduced gradually, finally eliminates speckle.In addition, the method is not processed by optical element after laser beam injection, therefore effectively ensure that the quality of light beam, can be applicable in the display of laser television.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is the suppression laser speckle method flow diagram that first embodiment of the invention provides;
Fig. 2 is the rectangular pulse signal schematic diagram that first embodiment of the invention provides;
Fig. 3 is a kind of array laser light source schematic diagram that first embodiment of the invention provides;
Fig. 4 is the another kind of array laser light source schematic diagram that first embodiment of the invention provides;
Fig. 5 is the method schematic diagram of a kind of suppression laser speckle be applied in a kind of laser television that second embodiment of the invention provides;
Fig. 6 is the method schematic diagram that another kind that second embodiment of the invention provides is applied in the suppression laser speckle in a kind of laser television.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
Present embodiments provide a kind of method suppressing laser speckle, comprising:
S101, multiple laser cell is arranged with the form of array, and light direction identical formation array laser light source;
Wherein more preferably, multiple laser cell is evenly distributed on array laser light source.Laser cell preferably adopts red laser diode, green laser diode or blue laser diode.Accordingly, the wavelength of laser diode is respectively 671nm, 532nm, 473nm; Power is respectively 3.5W, 0.32W, 1.3W.
S102, to choose several laser cells in array laser light source be the first laser cell group, and remaining laser cell is the second laser cell group.Wherein, the laser cell number of the first laser cell group is identical with the laser cell number of the second laser cell group or differ one, ensures that laser array gross output is constant with this.
In order to the clearer method understood the present embodiment and provide, to how to choose be illustrated below.
Fig. 2 shows each row in array laser light source and comprises a kind of spread pattern of even number laser cell.Wherein, distributed four laser cells in each row of array laser light source.The first row in array laser light source: by laser cell arrangement order from top to bottom, to choose sequence be the laser cell (first laser cell 11, the 3rd laser cell 13) of odd number is the first laser cell group, and remaining laser cell (second laser cell 12, the 4th laser cell 14) is the second laser cell group.Similarly, other in array laser light source arrange also Using such method and choose.
It is apparent that in this situation shown in Fig. 2, the number choosing the LASER Light Source that the first laser cell group of obtaining and the second laser cell group comprise is identical.
Fig. 3 shows each row in array laser light source and comprises a kind of spread pattern of odd number laser cell.Wherein, distributed five laser cells in each row of array laser light source.Choose from the first row in array laser light source: by laser cell arrangement order from top to bottom, to choose sequence be the laser cell (first laser cell 21, the 3rd laser cell 23, the 5th laser cell 25) of odd number is the first laser cell group, and remaining laser cell (second laser cell 12, the 4th laser cell 14) is the second laser cell group.Then, in a second column, by laser cell arrangement order from the bottom to top, to choose sequence be the laser cell (the 7th laser cell 27 etc.) of even number is the first laser cell group, and remaining laser cell (the 6th laser cell 26 etc.) is the second laser cell group.
It is apparent that in this situation shown in Fig. 3, the number choosing the LASER Light Source that the first laser cell group of obtaining and the second laser cell group comprise is difference one.
Certainly can understand, choosing method of the present invention is not limited only to above-mentioned two kinds of describing, as long as the result chosen makes each laser cell and adjacent laser cell not at same group, achieve being alternately arranged of the first laser cell group and the second laser cell group.
S103, control the first laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness; When the first laser cell group reaches the second brightness, control the second laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness.
Wherein, the first laser cell group is identical with the cycle that the second laser cell group changes.Preferably, the change of the first laser cell group and the second laser cell group is by Current Control.As shown in Figure 4, the electric current controlling change is triangular pulse formula electric current, and pulse height is 5A, and pulse rise time and fall time are 4ms, and pulse width is 8ms.For a better understanding of the present invention, will illustrate how to control the first laser cell group and the second laser cell group changes below: in 0-4ms, increased gradually by the brightness of Current Control first laser cell group, be changed to the second brightness by the first brightness.Wherein more preferably, the first brightness is non-luminous brightness, and the second brightness is maximum luminosity.When 4ms, the first laser cell group reaches the second brightness, now starts to control the second laser cell group.In 4-8ms, reduced gradually by the brightness of Current Control first laser cell group, be changed to the first brightness by the second brightness.The brightness under the control of electric current of second laser cell group increases gradually, is changed to the second brightness by the first brightness.Within the cycle afterwards, control method by that analogy, just repeated no longer one by one at this for saving length.
By the control method that above-mentioned first laser cell group and the second laser cell group light and shade alternately gradually change, amplitude between adjacent laser unit is differed greatly, interference fringe light and shade is distinguished very micro-, decrease the interference between light beam, speckle contrast is reduced gradually.When lower than less than 4%, human eye just discovers being present in less than speckle, thus effectively can suppress the formation showing speckle.
Embodiment two
Present embodiments provide a kind of method of the suppression laser speckle be applied in a kind of laser television.As shown in Figure 5, array laser light source is ruddiness array laser light source 101, green glow array laser light source 102 and blue light array laser light source 103.The speckle making ruddiness array laser light source 101, green glow array laser light source 102 and blue light array laser light source 103 penetrate laser by the method for embodiment one obtains suppression.Through a series of process such as modulator-demodular units 2, laser is penetrated on laser television display screen 3, and the speckle formed due to the laser injected obtains effective suppression, and therefore laser television display screen 3 cannot see speckle, thus improve display effect.
Embodiment three
Present embodiments provide a kind of method of the suppression laser speckle be applied in another kind of laser television.As shown in Figure 6, array laser light source 1 is ruddiness array laser light source, green glow array laser light source or blue light array laser light source.The speckle making array laser light source 1 penetrate laser by the method for embodiment one obtains suppression.Through crystal or photoconduction 4 for generating RGB tri-kinds of colors, laser is penetrated on laser television display screen 3, and the speckle formed due to the laser injected obtains effective suppression, and therefore laser television display screen 3 cannot see speckle, thus improve display effect.
In sum, the invention provides a kind of method suppressing laser speckle.Wherein, the control method that the method is alternately gradually changed by above-mentioned first laser cell group and the second laser cell group light and shade, amplitude between adjacent laser unit is differed greatly, interference fringe light and shade is distinguished very micro-, decrease the interference between light beam, speckle contrast is reduced gradually, finally eliminates speckle.Meanwhile, because the first laser cell group is identical with the laser cell number that the second laser cell group comprises or differ one, ensure that the stable of whole LASER Light Source general power.In addition, the present invention, from the angle of light source, does not set up any optical element in light path, therefore improves the utilization factor of luminous energy, also improves laser display quality.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. suppress a method for laser speckle, it is characterized in that, comprising:
Multiple laser cell is arranged with the form of array, and light direction identical formation array laser light source;
Choosing several laser cells in described array laser light source is the first laser cell group, and remaining laser cell is the second laser cell group;
Control described first laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness; When described first laser cell group reaches the second brightness, control described second laser cell group and be changed to the second brightness by the first brightness, then be changed to the first brightness;
Wherein, described first laser cell group is identical with the cycle that the second laser cell group changes;
The laser cell number of described first laser cell group is identical with the laser cell number of the second laser cell group or differ one.
2. the as claimed in claim 1 method suppressing laser speckle, is characterized in that, described first laser cell group and the second laser cell group by the first brightness be changed to the second brightness again the second brightness be changed to the first brightness, be even variation.
3. the method suppressing laser speckle as claimed in claim 1, it is characterized in that, it is described that to choose several laser cells in described array laser light source be the first laser cell group, be by described array laser light source often the interval that puts in order of row laser cell choose.
4. the method suppressing laser speckle as claimed in claim 1, it is characterized in that, in described several laser cell light emitting step chosen in described array laser light source, several laser cells in described array laser light source are controlled by the electric signal of change.
5. the method eliminating laser display speckle as claimed in claim 1, is characterized in that, the change of the described first laser cell group of described control and the first laser cell group, is that the electric signal being triangular pulse by form controls;
Wherein, the pulse height of described triangular pulse is 5A, and pulse width is 8ms, and pulse rise time and fall time are 4ms.
6. LASER Light Source as claimed in claim 5, is characterized in that, described in multiple laser cell is arranged with the form of array, be what to make multiple laser cell with the even arrangement of array.
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| CN201510689745.8A CN105301792A (en) | 2015-10-22 | 2015-10-22 | Laser speckle inhibition method |
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| CN201510689745.8A CN105301792A (en) | 2015-10-22 | 2015-10-22 | Laser speckle inhibition method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6577429B1 (en) * | 2002-01-15 | 2003-06-10 | Eastman Kodak Company | Laser projection display system |
| CN101263421A (en) * | 2005-09-14 | 2008-09-10 | 松下电器产业株式会社 | Image forming device |
| CN101276198A (en) * | 2007-03-31 | 2008-10-01 | 索尼德国有限责任公司 | Illumination device and method for illuminating uniformly an image generating micro display |
| CN101339300A (en) * | 2008-08-13 | 2009-01-07 | 哈尔滨工业大学 | Double light beam interference adjustable gain laser writing filtering method and apparatus |
| US20120281943A1 (en) * | 2006-11-13 | 2012-11-08 | Sbg Labs Inc. | Laser illumination device |
-
2015
- 2015-10-22 CN CN201510689745.8A patent/CN105301792A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6577429B1 (en) * | 2002-01-15 | 2003-06-10 | Eastman Kodak Company | Laser projection display system |
| CN101263421A (en) * | 2005-09-14 | 2008-09-10 | 松下电器产业株式会社 | Image forming device |
| US20120281943A1 (en) * | 2006-11-13 | 2012-11-08 | Sbg Labs Inc. | Laser illumination device |
| CN101276198A (en) * | 2007-03-31 | 2008-10-01 | 索尼德国有限责任公司 | Illumination device and method for illuminating uniformly an image generating micro display |
| CN101339300A (en) * | 2008-08-13 | 2009-01-07 | 哈尔滨工业大学 | Double light beam interference adjustable gain laser writing filtering method and apparatus |
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Application publication date: 20160203 |
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