A speckle-dissipating light path and three-color laser projection system

A speckle and optical path technology, applied in optics, optical components, instruments, etc., can solve the problems of high cost of dynamic speckle components, reduced user viewing experience, and inability to meet display requirements, so as to increase the spatial position range and reduce chromatic aberration. , the effect of reducing the number of

Active Publication Date: 2021-03-16
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the high coherence of the laser causes the speckle effect in the laser projection display. Speckle refers to that when a coherent light source illuminates a rough object, the scattered light is generated in space due to the constant phase difference, the same light wave frequency, and the same vibration direction. Interference, some parts interfere constructively, and some parts interfere destructively. The final result is that there are bright and dark spots on the screen, that is, speckle. Cause discomfort, more seriously affect the quality of the projection screen, and reduce the user's viewing experience
[0003] The existing speckle elimination scheme in the laser projection display technology is: setting multiple dynamic or static diffusion components in the illumination light path, or combining dynamic and static components for speckle elimination processing. The achieved speckle dissipation effect still cannot meet the display requirements, and the cost of using more dynamic speckle dissipation components is high and the noise is high. It is still necessary to further optimize the speckle dissipation scheme to achieve the best speckle dissipation effect

Method used

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  • A speckle-dissipating light path and three-color laser projection system
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  • A speckle-dissipating light path and three-color laser projection system

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Embodiment 1

[0088] Such as figure 1 As shown, this embodiment provides a speckle elimination optical path including: a reflection optical path assembly and a dynamic speckle elimination device, the dynamic speckle elimination device includes a vibration controller 301 and a diffusion part 302, and the reflection optical path assembly includes a first mirror 303, a second The reflector 304 and the light rod 40; the diffuser 302 is placed between the first reflector 303 and the second reflector 304; the vibration controller 301 drives the diffuser 302 to vibrate.

[0089] Preferably, in this embodiment, the first reflector 303 and the second reflector 304 are preferably curved reflectors, which can be set as spherical, hyperboloid, parabolic, ellipsoid or free-form surfaces according to the needs of the technical solution.

[0090] Such as Image 6 As shown, in this embodiment, the diffuser 302 is a square diffuser, which can be used as a single piece or a combination of multiple pieces; t...

Embodiment 2

[0099] Such as Figure 8 As shown, in this embodiment, a speckle-eliminating optical path is provided, including: a diffusion component 302, a motor 307, a first mirror 303, a second mirror 304, and a light rod 40;

[0100] Such as Figure 10 As shown, the diffuser 302 is a disc-shaped diffuser, with one or both sides frosted.

[0101] The optical path structure and optical principle of this embodiment are basically the same as those of Embodiment 2, the difference is that the technical solution adopted by the dynamic speckle elimination device in this embodiment is: the motor 307 is coaxially connected with the diffusion part 302, and the motor 307 is placed on the diffusion part 302 , the first reflector 303 and the second reflector 304 are respectively arranged on the same side of the rotation axis of the motor 307 . The motor 307 drives the diffuser 302 to rotate around the axis at a high speed to achieve a better speckle dissipation effect.

[0102] Such as Figure 9 ...

Embodiment 3

[0104] Such as Figure 11 As shown, in this embodiment, a laser speckle-eliminating light path 30 is provided, including: a first condenser lens 305 , a vibration controller 301 , a diffusion component 302 , an ellipsoidal mirror 308 , and a light rod 40 .

[0105] Specifically, the diffuser 302 is placed parallel to the aperture end face of the ellipsoidal mirror 308, and the diffuser 302 is within ±5mm of the first focus 309 and the second focus 310 of the ellipsoid.

[0106] In the present embodiment, the working process of the laser speckle optical path 30 is as follows: the laser beam is incident on the first condenser lens 305, then the laser beam is focused on the first focal point 309 of the ellipsoid mirror 308, and the ellipsoid mirror 308 reflects the laser beam and focuses on On the second focal point 310 , an optical rod 40 is placed in front of the focal point, and the laser beam is incident on the optical rod 40 for uniform light.

[0107] Preferably, the diffu...

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Abstract

The invention discloses a speckle elimination light path and a three-color laser projection system, which relate to the technical field of laser display. The three-color laser projection system comprises a reflective optical path assembly, a dynamic speckle elimination device and an optical rod, wherein the dynamic speckle elimination device comprises a diffusing component and a driving componentconnected with the diffusing component; and the reflective optical path assembly focuses a laser beam passing through the diffusing component to an inlet of the optical rod after at least one reflection. The light path turns for multiple times by means of the reflective optical path assembly, the functions of a plurality of dynamic speckle elimination devices are realized by means of only one dynamic speckle elimination device disclosed by the invention, and a good speckle elimination effect is achieved. The laser speckle elimination light path provided by the invention is simple in structure,the reflection or refraction and reflection combined light path design makes the structure of an optical machine more compact, and the miniaturization of the three-color laser projection system is easy to realize.

Description

technical field [0001] The invention relates to the technical field of laser display, in particular to a speckle-dissipating optical path and a three-color laser projection system. Background technique [0002] As a newly developed projection technology, laser projection uses a diode laser as a light source, and the light is projected on the light modulation chip (DMD, LCD, LCOS, etc.) after being homogenized by the lighting system, and then imaged on the image surface through the projection lens. Among them, the high coherence of the laser causes the speckle effect in the laser projection display. Speckle refers to that when a coherent light source illuminates a rough object, the scattered light is generated in space due to the constant phase difference, the same light wave frequency, and the same vibration direction. Interference, some parts interfere constructively, and some parts interfere destructively. The final result is that there are bright and dark spots on the scr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48G03B21/20
CPCG02B27/48G03B21/206G03B21/2066G03B21/208
Inventor 何龙姜银磊梁其鹏
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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