摘要 :
A small, hand-held laser projector is developed using a MEMS scanning mirror. The vertical scan is done by the vibrating mirror and the horizontal scan is done by the user’s action to swing this projector. The prototype is equippe...
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A small, hand-held laser projector is developed using a MEMS scanning mirror. The vertical scan is done by the vibrating mirror and the horizontal scan is done by the user’s action to swing this projector. The prototype is equipped with the photo sensor and barcode reader circuit module to identify the real object with the retroreflective barcode. When the user swing this projector, projector begin to search the object with barcode ID, and when the projector detect such object, the annotation associated with the object’s ID is displayed.
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摘要 :
A small, hand-held laser projector is developed using a MEMS scanning mirror. The vertical scan is done by the vibrating mirror and the horizontal scan is done by the users action to swing this projector. The prototype is equipp...
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A small, hand-held laser projector is developed using a MEMS scanning mirror. The vertical scan is done by the vibrating mirror and the horizontal scan is done by the users action to swing this projector. The prototype is equipped with the photo sensor and barcode reader circuit module to identify the real object with the retroreflective barcode. When the user swing this projector, projector begin to search the object with barcode ID, and when the projector detect such object, the annotation associated with the objects ID is displayed.
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摘要 :
Speckle arises when coherent light scattered from a rough surface is detected by an intensity detector that has a finite aperture, such as an observer. In a laser projection display, the presence of speckle tends to mask the image...
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Speckle arises when coherent light scattered from a rough surface is detected by an intensity detector that has a finite aperture, such as an observer. In a laser projection display, the presence of speckle tends to mask the image information and therefore its reduction is highly desirable. Speckle contrast reduction is based on averaging a number of speckle configurations within the spatio-temporal resolution of the detector through diversification of the light parameters -angle, polarization, and wavelength. The maximum speckle contrast reduction for a given system will be derived, and two novel approaches to achieve the maximum reduction will be introduced. Application to the Grating Light Valve~(TM) (GLV~(TM)) laser projection system using the Hadamard diffuser has resulted in a suppression to 8% residual speckle contrast.
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摘要 :
Speckle arises when coherent light scattered from a rough surface is detected by an intensity detector that has a finite aperture, such as an observer. In a laser projection display, the presence of speckle tends to mask the image...
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Speckle arises when coherent light scattered from a rough surface is detected by an intensity detector that has a finite aperture, such as an observer. In a laser projection display, the presence of speckle tends to mask the image information and therefore its reduction is highly desirable. Speckle contrast reduction is based on averaging a number of speckle configurations within the spatio-temporal resolution of the detector through diversification of the light parameters -angle, polarization, and wavelength. The maximum speckle contrast reduction for a given system will be derived, and two novel approaches to achieve the maximum reduction will be introduced. Application to the Grating Light Valve~(TM) (GLV~(TM)) laser projection system using the Hadamard diffuser has resulted in a suppression to 8% residual speckle contrast.
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摘要 :
The laser projector manufactured for World Expo Shanghai combines the white laser module technology with novel heat transfer design. This results in images with an impressive light output of up to 20,000 ANSI lumens ,low power...
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The laser projector manufactured for World Expo Shanghai combines the white laser module technology with novel heat transfer design. This results in images with an impressive light output of up to 20,000 ANSI lumens ,low power consumption and more compact size.
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摘要 :
The laser projector manufactured for World Expo Shanghai combines the white laser module technology with novel heat transfer design. This results in images with an impressive light output of up to 20,000 ANSI lumens, low power con...
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The laser projector manufactured for World Expo Shanghai combines the white laser module technology with novel heat transfer design. This results in images with an impressive light output of up to 20,000 ANSI lumens, low power consumption and more compact size.
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摘要 :
A projective number display device that uses laser-diode as its light source is introduced in this article. The device can project to a very long distance due to the usage of laser-diode. The direction, shape and size of the fond ...
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A projective number display device that uses laser-diode as its light source is introduced in this article. The device can project to a very long distance due to the usage of laser-diode. The direction, shape and size of the fond being projected can also be changed. The overall idea is given in the paper, as well as the structure charts and hardware connecting circuit of the device. The innovation technique about this device has gained Chinese patent of invention.
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摘要 :
A new principle of the projection display based on the laser with the conjugate resonator is offered one of which mirrors is SLM. Intraresonator reading of the image created on SLM, provides oscillation of an optical signal as the...
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A new principle of the projection display based on the laser with the conjugate resonator is offered one of which mirrors is SLM. Intraresonator reading of the image created on SLM, provides oscillation of an optical signal as the generated image with high luminosity and optical resolution.
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摘要 :
A new principle of the projection display based on the laser with the conjugate resonator is offered one of which mirrors is SLM. Intraresonator reading of the image created on SLM, provides oscillation of an optical signal as the...
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A new principle of the projection display based on the laser with the conjugate resonator is offered one of which mirrors is SLM. Intraresonator reading of the image created on SLM, provides oscillation of an optical signal as the generated image with high luminosity and optical resolution.
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摘要 :
Two alternative methods for effectively reducing the speckle noise in laser based rear and front projection displays are studied and demonstrated. Firstly, widening of the laser emission spectrum to nearly 4nm by tailoring the str...
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Two alternative methods for effectively reducing the speckle noise in laser based rear and front projection displays are studied and demonstrated. Firstly, widening of the laser emission spectrum to nearly 4nm by tailoring the structures of 640nm band AlGalnP/GaInP based edge emitting broad-area red laser diode arrays, realized a reduction of speckle contrast from 20% to an acceptable level of 5%. Designing the power/wavelength distribution of the multiple emitters to achieve a flat top profile for the total spectrum plays an important role in maximizing the speckle reduction effect. This approach could easily be adapted to laser diodes arrays of other materials or wavelengths. Secondly, relative oscillation movement within the screen layers can also reduce the speckle contrast to the acceptable level of 5%. The moving layer material and the oscillation period has been studied and optimized to maximize the reduction level for both rear and front projection configurations. The two speckle reduction techniques were evaluated on a front projector utilizing a red laser assisted UHP lamp hybrid light source, and showed significant enhancement in view ability by the suppression of speckle. Combining the two techniques lead to further reduction in speckle and scintillation noise to a supreme level of 2%, enabling a practical solution for wide color gamut and high efficiency laser projection displays.
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