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Light source for projection

A light source and projection technology, applied in the field of projection light sources, can solve the problems of complex optical path design, low reception, loss of LED beams, etc., and achieve the effect of simplifying the structure of the optical path and increasing the light intensity

Active Publication Date: 2019-10-01
福建省锐驰物联网股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain a light source structure with a wide color gamut, the cost of projectors using laser diodes of three primary colors (red, green, and blue) as light sources is extremely high, and the market acceptance is not high.
It can be seen that the balance between image performance and cost issues is a lack that needs to be improved.
[0005] In addition, because the laser is linearly polarized light, there is a problem of speckle, which affects the projection effect, especially for red lasers, where the problem of speckle is particularly serious. To solve the above problems, there is currently a solution for combining laser beams and LED beams to resolve speckles. But its optical path design is complex
[0006] The light combination of the existing laser beam and LED beam is accomplished through an optical filter, which reflects the laser beam and allows the LED beam to penetrate, thereby realizing light combination. Taking red light as an example, the wavelength range of the red LED beam is It is 590-638nm, the wavelength range of the red laser beam is 633-645nm, the light passing through the wavelength greater than 620nm will be reflected by the filter, and the rest will pass through the filter, so the red LED beam with a wavelength above 620nm will be reflected , which means that LED beams with a wavelength of 620-638nm cannot participate in light synthesis, which will lose a lot of LED beams. Similarly, the combination of green light and blue light will also lose quite a lot of LED beams

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment one, with reference to figure 1 and figure 2 As shown, a light source for projection includes: a laser light source 1 , a speckle-removing light source, a wheel 2 , a light guide assembly, a second filter F2 , a fourth collimating mirror 6 , and a fluorescent wheel 7 .

[0037] Laser light source 1 can generate blue laser beam B1 and red laser beam R1 that work differently at the same time. Fluorescent wheel 7 can be excited by blue laser beam B1 to generate yellow light beam Y1. Speckle-resolving light source includes red LED light source 5 for generating nonlinear For the polarized red speckle-resolving light beam R2, the third collimating mirrors 71, 51 and relay mirrors 42, 41 are successively arranged on the light emitting side of the fluorescent wheel 7 and the red LED light source 5, and the second filter F2 is arranged between the yellow light beam Y1 and the red LED light source 5. On the path of the red speckle-removing beam R2, the yellow beam Y1...

Embodiment 2

[0048] Embodiment two, refer to Figure 4 and Figure 5 As shown, a light source for projection includes: a laser light source 1 , a speckle-removing light source, a rotating wheel 2 , a fluorescent wheel 7 , a light guide assembly, a second filter F2 , and a fourth collimating mirror 6 .

[0049] The laser light source 1 can generate a blue laser beam B1 and a red laser beam R1 that are not working at the same time, and the speckle-removing light source includes a red LED light source 5 for generating a non-linearly polarized red speckle-removing beam R2. The light emitting side of the red LED light source 5 is provided with a third collimating mirror 51 and a relay mirror 41 in sequence, and the second filter F2 is arranged on the path of the red speckle-resolving beam R2, and the red speckle-resolving beam R2 penetrates the second filter Slice F2 then shoots to the runner.

[0050] The wheel 2 is rotatably arranged on the paths of the blue laser beam B1, the red laser bea...

Embodiment 3

[0058] Embodiment three, refer to figure 1 and figure 2 As shown, a light source for projection includes: a laser light source 1 , a rotating wheel 2 , a light guide assembly, a fourth collimating mirror 6 , and a fluorescent wheel 7 .

[0059] The laser light source 1 can generate a blue laser beam B1, and the fluorescent wheel 7 can be excited by the blue laser beam B1 to generate a yellow light beam Y1.

[0060] The wheel 2 is rotatably arranged on the paths of the blue laser beam B1 and the yellow light beam Y1, and the wheel 2 has a reflective area 23, a first filter area 21, a second filter area 22 and a transmissive area arranged along its contour. District 24. The first filter area 21 and the second filter area 22 are formed by plating a filter film on the glass substrate, so that the first filter area 21 and the second filter area 22 can filter out unnecessary wavebands to conform to their wavebands. The beam penetrates.

[0061] The light guide assembly includes...

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PUM

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Abstract

A light source for projection is characterized by comprising a laser light source used for generating a laser beam, a rotating wheel rotationally arranged on the path of the laser beam and having at least one filter area which can be penetrated by the laser beam, and a phosphor capable of being excited by the laser beam penetrating the filter area to generate a composite beam and guiding the composite beam to the rotating wheel, wherein the composite beam penetrates the filter area to generate a projection beam which is guided to a projection direction.

Description

technical field [0001] The invention relates to a projection light source. Background technique [0002] A projector is a device that projects different colors of colored light to a display device to display images through an optical path system composed of a light source, a filter, a phosphor wheel (Phosphor Wheel, PW), and a beam splitter. [0003] Different light sources or different optical path system designs will not only affect the volume and cost of the projector. More directly, it will also affect the brightness and color performance of the final displayed image. [0004] In terms of light source, laser diode light source (Laser Diode) has the advantages of high brightness, long life and minimal heat generation. Therefore, it is the first choice for various light sources in terms of product life, image brightness and color performance. However, in order to obtain a light source structure with a wide color gamut, the cost of a projector using laser diodes of three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/20G02B26/00G02B27/30G02B27/48
CPCG03B21/204G02B26/008G03B21/2066G02B27/30G02B27/48
Inventor 吕素萍苏文露孔建平
Owner 福建省锐驰物联网股份有限公司
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