Dynamic speckle eliminating device for laser projection display

A technology of laser projection and dispersing speckle, which is applied in projection devices, optics, optical components, etc., can solve the problem of unsatisfactory dispersing speckle effect of red light and green light, and achieve the effect of reducing phase coherence and better dispersing speckle

Inactive Publication Date: 2019-02-22
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the three-color laser display technology, this solution is not ideal for the speckle dissipation effect of red light and green light, and further optimization of the speckle dissipation device in the optical path is still needed to achieve a better viewing effect

Method used

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  • Dynamic speckle eliminating device for laser projection display
  • Dynamic speckle eliminating device for laser projection display
  • Dynamic speckle eliminating device for laser projection display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as figure 1 As shown, in this embodiment, a laser projection display system is provided, including a laser light source module 10, a dynamic speckle elimination device 20, a condenser lens 30, and a light rod 40; the dynamic speckle elimination device 20 includes a driving component 201 and Prism 202.

[0041] Such as figure 2 As shown, the prism 202 is an isosceles right-angle prism, including the first diffusing surface A as the light incident surface, the reflecting surface B as the total reflection surface, and the second diffusing surface C as the light emitting surface, preferably the first diffusing surface and the second The scattering mode of the diffuse surface is Gaussian scattering.

[0042] Further, the driving component 201 is a vibration controller, and the driving component 201 drives the prism 202 to vibrate periodically according to a preset trajectory.

[0043] Such as image 3 As shown, the laser beam is vertically incident on the point o o...

Embodiment 2

[0056] Such as Figure 8 As shown, a laser projection display system is provided in Embodiment 2 of the present invention, including a laser light source module 10, a dynamic speckle elimination device 20, a condenser lens 30, and a light rod 40; the dynamic speckle elimination device 20 includes a driving component 201 , a prism 202 , a first diffusion component 203 and a second diffusion component 204 ;

[0057] Further, the drive part 201 is a vibration controller; the prism 202 is an isosceles right-angle prism, and all surfaces are plane; the first diffusion part 203 and the second diffusion part 204 are diffusion sheets, single-sided or double-sided Surface diffuse scattering.

[0058] Further, in this embodiment, the first diffusion member 203 , the second diffusion member 204 and the prism 202 are placed in close contact, or there is a gap of 0-5 mm between them.

[0059] Further, the first diffusion component 203 and the second diffusion component 204 are combined i...

Embodiment 3

[0063] Such as Figure 9 As shown, Embodiment 3 of the present invention provides a laser projection display system, including a laser light source module 10, a dynamic speckle elimination device 20, a condenser lens 30, and a light rod 40; the dynamic speckle elimination device 20 includes a driving component 201 , mirror 205, first diffusion component 203 and second diffusion component 204;

[0064] Further, the reflector 205 is at an angle of 45° to the incident laser beam, and may be a plane reflector or a curved reflector; the first diffuser 203 is placed perpendicular to the incident light, and the second diffuser 204 is placed perpendicular to the outgoing beam, that is The first diffusion part 203 and the second diffusion part 204 are placed vertically.

[0065] Both the first diffusion part 203 and the second diffusion part 204 are diffusion sheets, and the two are combined into a diffusion assembly through structural members; the diffusion assembly and the reflector...

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PUM

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Abstract

The invention disclose a dynamic speckle eliminating device for laser projection display, relates to the technical field of laser projection display, and aims at improving the speckle eliminating effect. The dynamic speckle eliminating device comprises a prism and a driving part, the prism includes first and second diffusing surfaces and a reflection surface, and a laser beam is input in the firstdiffusing surface, reflected in the reflection surface and finally output from the second diffusing surface; and the driving part drives the prism to vibrate according to a preset track and period. In the vibration process of the dynamic speckle eliminating device, the two diffusing surfaces generate different vibration tracks, so that the phase coherence of the laser beam is reduced greatly, anda better speckle eliminating effect is achieved. The dynamic speckle eliminating device is suitable for a laser projector.

Description

technical field [0001] The invention relates to the technical field of laser projection display, in particular to a dynamic speckle elimination device for laser projection display. Background technique [0002] With the development of laser display technology, laser display products have been widely used in household, education and other fields, but the high coherence of laser causes the speckle effect in laser projection display. Due to the constant phase difference, the same light wave frequency, and the same vibration direction, the resulting light interferes in space, some parts interfere constructively, and some parts interfere destructively. The final result is that bright and dark spots appear on the screen, that is, Speckle, these unfocused spots appear to flicker to the human eye, which can easily cause discomfort when viewed for a long time, seriously affect the quality of the projected image, and reduce the user's viewing experience. [0003] In the existing lase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/48G03B21/20
CPCG02B27/48G03B21/2033G03B21/208
Inventor 何龙姜银磊梁其鹏
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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