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Speckle-eliminating part, laser light source, and laser projection device

A laser light source and speckle dissipation technology, applied in the field of projection display, can solve problems such as degradation of projected image quality, reduced user viewing experience, dizziness and discomfort, etc., to reduce speckle effect, improve user experience and product competitiveness, and reduce speckle spot effect

Inactive Publication Date: 2017-02-22
HISENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The high coherence of the laser also brings about the speckle effect in the laser projection display. The speckle is the scattered light when the coherent light source irradiates a rough object. Since the wavelength is the same and the phase is constant, it will interfere in space. , some parts of the space interfere constructively, and some parts interfere destructively. The final result is granular light and dark spots on the screen. It will cause dizziness and discomfort, which will also cause the degradation of the projected image quality and reduce the user's viewing experience

Method used

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  • Speckle-eliminating part, laser light source, and laser projection device
  • Speckle-eliminating part, laser light source, and laser projection device
  • Speckle-eliminating part, laser light source, and laser projection device

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Embodiment 1

[0039] Embodiment 1 of the present invention provides a speckle dissipating component, such as Picture 1-1 As shown, to receive the irradiation of laser beams, it specifically includes a first diffusion sheet 11 and a second diffusion sheet 12 , and a driving component 13 . Wherein, the first and second diffusing sheets 11, 12 have a common rotating shaft 15, and the driving part 13 drives the common rotating shaft 15 to respectively drive the first and second diffusing sheets 11, 12 to rotate, wherein, the first diffusing sheet 11 is fixed on the common On the rotating shaft 15 , the second diffusing sheet 12 is movably connected to the common rotating shaft 15 , specifically, the second diffusing sheet 12 is connected to the common rotating shaft 15 through a movable connection 14 .

[0040] In a specific implementation, the movable link 14 can be a bearing structure, the bearing is sleeved on the common rotating shaft 15 through balls, and can slide relative to the common r...

Embodiment 2

[0060] In order to describe the technical solutions provided by the embodiments of the present invention more clearly, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings by taking the embodiment of the laser light source using the speckle dissipating component of the present invention as an example.

[0061] see figure 2 , is a schematic diagram of an optical architecture based on a two-color light source using a speckle dissipating component in an embodiment of the present invention.

[0062] As shown in FIG. 1 , the structure of the two-color laser light source includes: a red laser array 201 and a blue laser array 202 , which respectively emit red laser light and blue laser light. And the wavelength converting device 206 is specifically a fluorescent wheel in this embodiment. The fluorescent wheel is provided with green fluorescent powder, which can receive blue laser light as excitation light for wave...

Embodiment 3

[0075] Based on the speckle elimination component introduced in Embodiment 1, this embodiment also provides an optical architecture of a three-color laser light source, using the speckle elimination component described above.

[0076] see image 3 , the optical structure of the laser light source in this embodiment includes: a semiconductor laser group 301 , a light combining lens group 502 , a speckle elimination component 303 , a focusing lens 304 , a fly-eye lens group 305 , and an integrating lens 306 .

[0077] Wherein, the semiconductor laser group 501 may specifically include three-color lasers, which emit three-color laser beams, that is, the laser light source in this embodiment is a pure laser light source. Generally, the beam emitted by the laser will be slightly divergent. In order to facilitate the utilization of the optical path, the laser emitted by the semiconductor laser needs to be collimated. The three-color laser beams are collimated and arrive at the ligh...

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Abstract

The invention discloses a speckle-eliminating part. The speckle-eliminating part comprises a first diffusion sheet, a second diffusion sheet and a driving part, the first diffusion sheet and the second diffusion sheet have a common rotating shaft, the driving part drives the common rotating shaft to respectively drive the first diffusion sheet and the second diffusion sheet to rotate, the first diffusion sheet is fixed on the common rotating shaft, and the second diffusion sheet is movably connected to the common rotating shaft so that the first diffusion sheet and the second diffusion sheet form driving and driven asynchronous rotation, the diversity of the divergence angles of incident laser beams through two continuous diffusion sheets can be improved, the probability for generating random phase is increased, the random phase can generate random speckle patterns, the coherence of the laser beams is reduced, and the speckle effect is greatly reduced through the human eye integration action. The invention also provides a laser light source and a laser projection device employing the speckle-eliminating part.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a speckle dissipating component, a laser light source and a laser projection device using the component. Background technique [0002] Laser is a light source with high brightness, strong directionality, and monochromatic coherent light beam. As an excellent coherent light source, laser light source has the advantages of good monochromaticity, strong directionality, and high luminous flux. Projection display technology field. [0003] The high coherence of the laser also brings about the speckle effect in the laser projection display. The speckle is the scattered light when the coherent light source irradiates a rough object. Since the wavelength is the same and the phase is constant, it will interfere in space. , some parts of the space interfere constructively, and some parts interfere destructively. The final result is granular light and dark spots on the screen. The feelin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G02B27/48
CPCG03B21/2013G02B27/48G03B21/204G03B21/208
Inventor 李巍
Owner HISENSE
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