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Double-color laser light source

A laser light source, red laser technology, applied in the field of projection display, can solve problems such as the reduction of projected image quality, and achieve the effects of reducing speckle phenomenon, reducing usage, and improving speckle dissipation efficiency

Active Publication Date: 2015-11-25
HISENSE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a two-color laser light source, which consists of a first diffusion part and a second diffusion part controlled to rotate to form a speckle dissipation system, which can simultaneously dissipate the speckle of the blue laser and the red laser, effectively weaken the speckle phenomenon, and solve the problem of Solved the technical problem in the prior art that the quality of the projected image is degraded due to the speckle effect caused by the use of the laser light source

Method used

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Embodiment 1

[0034] Embodiment 1 of the present invention provides a two-color laser light source, such as figure 1 As shown, it includes a blue laser array 11 and a red laser array 12, which emit blue laser light and red laser light respectively, and a fluorescent wheel 4, whose surface is coated with green phosphor powder, which emits green fluorescence when excited by the blue laser light, wherein , the blue laser and the red laser will also be shaped by the beam shaping device 2 before entering the fluorescent wheel 4 and the light-combining component 5, and the beam shaping device 2 includes the first diffusion part 31 of the speckle elimination system 3, wherein the first diffusion part 31 is controlled to rotate, and is located in the beam shaping optical path of the blue laser and the red laser, and is used for diffusing the blue laser and the red laser. The blue laser light is reflected to the fluorescent wheel through the light-combining component 5, and then reaches the light-co...

Embodiment 2

[0038] Embodiment 2 of the present invention provides a laser light source, such as figure 2 As shown, the blue laser array 11 for outputting blue laser and the red laser array 12 for outputting red laser are vertically arranged, and the beams emitted by the vertically arranged arrays are also perpendicular to each other. This arrangement helps to reduce the volume occupied by the laser, and at the same time facilitates the sharing of beam shaping devices.

[0039] Because the laser spot emitted by the laser may have uneven brightness and excessive beam area, resulting in low light transmittance of optical components, low fluorescence excitation efficiency, and low laser collection efficiency due to the spread angle of the laser beam being greater than the collection angle of the light bar Affects many problems such as the brightness of the projection light source, so it is necessary to perform a series of beam shaping such as reflection and refraction on the laser, reduce its ...

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Abstract

The invention discloses a double-color laser light source which comprises a blue laser and a red laser which emit blue laser light and red laser light respectively; and a fluorescent wheel, the surface of which is coated with green fluorescent powders, wherein the green fluorescent powders emit green fluorescence when excited by the blue laser light. The double-color laser light source also comprises a speckle dissipation system. The speckle dissipation system comprises a first diffusion portion which is controlled to rotate, is arranged in a beam shaping optical path of the blue laser light and red laser light and is used for diffusing the blue laser light and the red laser light; and a second diffusion portion which is controlled to rotate, is arranged before a blue laser light, red laser light and green fluorescence incident light bar, and is used for at least penetrating the blue laser light and the red laser light sequentially and forming blue light and red light output. The double-color laser light source can effectively reduce speckle effect and improve display quality of projected images.

Description

technical field [0001] The invention relates to the field of projection display, in particular to a two-color laser light source. Background technique [0002] Laser is a light source with high brightness, strong directionality, and monochromatic coherent light beam. Due to its many advantages, it has been gradually used as a light source in the field of projection display technology in recent years. However, due to the high coherence of laser, speckle effect is inevitable. This phenomenon is not only obvious in the scheme using pure laser as light source, but also exists in the scheme of mixed light source of laser and fluorescent light, as well as laser and LED. The so-called speckle means that when a coherent light source irradiates a rough object, the scattered light will interfere in space because of the same wavelength and constant phase. The final result is that there are granular light and dark spots on the screen, that is, some unfocused spots flicker, and it is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G02B27/48G02B27/09
CPCG02B27/09G02B27/48G03B21/20
Inventor 田有良刘显荣李巍
Owner HISENSE
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