Speckle-Eliminating Light Path Structure for Compact Laser Projection
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Solution Overview
Problem
Laser projection products suffer from speckle effects due to high coherence, which degrade consumer experience and picture quality.
Innovation Solution
A speckle-eliminating light path structure that includes a laser light source, a speckle-eliminating element, and a reflective light path assembly, where the laser beam passes through the speckle-eliminating element at least twice, changing direction via reflective surfaces to suppress speckles, and emits at an angle of 60° to 90° relative to the element's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laser beam passes through the speckle-eliminating element multiple times via reflective light path assembly, then the speckle suppression effect is improved, but the light path length increases
Solution Approach 1:
The reflective light path assembly is nested within the compact structure of the projection device, allowing the laser beam to pass through the speckle-eliminating element multiple times in a confined space. The reflective surfaces are arranged to fold the light path back on itself, enabling multiple passes without significantly increasing the overall device length.
Solution Approach 2:
The reflective light path assembly utilizes multi-dimensional spatial arrangement to redirect the laser beam through the speckle-eliminating element multiple times. By changing the direction of the beam in three-dimensional space rather than simply extending the light path linearly, the design achieves multiple passes within a compact volume.
2Use of energy by moving object
If the laser beam emits at a large angle (60° to 90°) from the speckle-eliminating element, then the luminous efficacy is improved, but the light path becomes more complex
Solution Approach 1:
The reflective light path assembly is designed to dynamically redirect the laser beam at specific angles (60° to 90°) relative to the speckle-eliminating element surface. This angular configuration optimizes the extraction of light energy while maintaining a manageable light path structure through strategic placement of reflective surfaces.
3Reliability
If conventional speckle reduction measures are used, then the coherence of laser is reduced, but the speckle elimination effect is limited
Solution Approach 1:
The speckle-eliminating element is positioned in the light path before the beam reaches the projection screen. The element is designed to scatter and randomize the laser beam phase and direction in advance, preventing speckle formation at the screen. The reflective light path assembly is configured to pass the beam through this pre-treatment element multiple times to maximize speckle suppression.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses speckles, improves luminous efficacy, and shortens the projection light path while maintaining a compact structure and low cost.
Implementation Method 1
a reflective light path assembly including a reflective surface, in which the laser beam emitted by the laser light source enters the speckle-eliminating element, then reaches the reflective surface, is reflected by the reflective surface
Implementation Method 2
a speckle-eliminating element configured to transmit the laser beam emitted by the laser light source; the laser beam emitted by the laser light source passes through the speckle-eliminating element at least twice in a process of changing direction through the reflective surface
Data Source
AI summary
A speckle-eliminating light path structure and a laser projection apparatus are provided. The speckle-eliminating light path structure includes a laser light source, a speckle-eliminating element, and a reflective light path assembly. A laser beam emitted by the laser light source enters the speckle-eliminating element, reaches a reflective surface of the reflective light path assembly, is reflected by the reflective surface, and enters the speckle-eliminating element. The laser beam emitted by the laser light source passes through the speckle-eliminating element at least twice in a process of changing a direction through the reflective surface of the reflective light path assembly so as to suppress speckles of the laser beam at least twice, and emits from the speckle-eliminating element. The laser beam transmitted from the speckle-eliminating element emits at an angle of 60° to 90° relative to a surface of the speckle-eliminating element and then enters a post-stage light path.