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a 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 optical path structure and improving the light intensity

Active Publication Date: 2022-06-07
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

[0035] Embodiment 1, refer to figure 1 and figure 2 As shown, a light source for projection includes: a laser light source 1 , a speckle removal light source, a rotating wheel 2 , a light guide component, a second filter F2 , a fourth collimating mirror 6 , and a fluorescent wheel 7 .

[0036] The laser light source 1 can generate a blue laser beam B1 and a red laser beam R1 that do not work at the same time, the fluorescent wheel 7 can be excited by the blue laser beam B1 to generate a yellow beam Y1, and the speckle light source includes a red LED light source 5, which is used to generate nonlinear The polarized red de-spotting beam R2, the third collimating mirrors 71, 51 and the relay mirrors 42, 41 are arranged on the light-emitting side of the fluorescent wheel 7 and the red LED light source 5 in turn, and the second filter F2 is arranged on the yellow beam Y1 and On the path of the red de-speckling beam R2, the yellow beam Y1 can be reflected by the second filter F2 a...

Embodiment 2

[0047] Embodiment 2, 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 component, a second filter F2 , and a fourth collimating mirror 6 .

[0048] The laser light source 1 can generate a blue laser beam B1 and a red laser beam R1 that do not work at the same time, and the de-speckling light source includes a red LED light source 5 for generating a non-linearly polarized red de-speckling beam R2. A third collimating mirror 51 and a relay mirror 41 are arranged on the light-emitting side of the red LED light source 5 in sequence, and the second filter F2 is arranged on the path of the red de-speckling beam R2, and the red de-speckling beam R2 penetrates the second filter. After the film F2 shoots to the runner.

[0049] The wheel 2 is rotatably arranged on the path of the blue laser beam B1, the red laser beam R1, and the red de...

Embodiment 3

[0057] Embodiment 3, 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 .

[0058] 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 beam Y1.

[0059] The wheel 2 is rotatably arranged on the path of the blue laser beam B1 and the yellow light beam Y1, and the wheel 2 has a reflection area 23, a first filter area 21, a second filter area 22 and a penetrating area arranged along its outline. District 24. The first filter area 21 and the second filter area 22 are formed by coating a filter film on a glass substrate, so that the first filter area 21 and the second filter area 22 can filter out the unnecessary wavelength bands and make the wavelength bands fit. The beam penetrates.

[0060] The light guide assembly include...

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PUM

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Abstract

A light source for projection, characterized in that it includes: a laser light source, used to generate a laser beam; a wheel, rotatably arranged on the path of the laser beam, the wheel has at least one filter area, and the laser beam It can penetrate the filter area; a fluorescent body can be excited by the laser beam penetrating the filter area to generate a composite beam and guide the wheel, and the composite beam passes through the filter area to generate a projection beam and guide it to a projection direction.

Description

technical field [0001] The present invention relates to a projection light source. Background technique [0002] Projector is a device that projects color light of different colors to a display device to display images through an optical path system composed of optical elements such as a light source, a filter, a Phosphor Wheel (PW), and a beam splitter. [0003] Different light sources or different optical path system designs will not only affect the size 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 diod...

Claims

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Application Information

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Patent Type & Authority Patents(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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