Vibrating Beam-Shaping Lens for Laser Speckle Reduction
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Solution Overview
Problem
Existing projection display devices using lasers suffer from speckle issues due to the high coherence of laser beams, which deteriorate image quality, and existing methods to reduce speckles require additional devices that increase costs, complexity, and reduce optical efficiency.
Innovation Solution
A speckle reduction device that uses a beam-shaping lens to shape laser beams and a vibration unit to vibrate the lens in multiple axes, creating diverse patterns that reduce speckle occurrence without the need for additional optical devices, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a separate device such as a diffuser sheet is added to change phases of laser beams, then speckle occurrence is reduced, but device complexity and cost increase
Solution Approach 1:
The patent combines the speckle reduction function with the existing beam-shaping lens by adding a vibration unit, merging multiple functions into a single component system rather than adding separate optical devices
Solution Approach 2:
The patent introduces dynamic vibration of the beam-shaping lens in multiple axes to dynamically change the optical path and reduce speckle, transforming a static optical system into a dynamic one
2Object-affected harmful factors
If a separate device such as a diffuser sheet is added to change phases of laser beams, then speckle occurrence is reduced, but optical efficiency is lowered
Solution Approach 1:
The vibration unit is integrated with the existing beam-shaping lens, combining speckle reduction with beam shaping in one component to avoid additional optical elements that would reduce efficiency
Solution Approach 2:
The patent uses mechanical vibration of the lens to achieve speckle reduction through phase modulation, which is more efficient than using diffuser sheets that scatter and lose optical energy
3Object-affected harmful factors
If a separate device such as a diffuser sheet is added to change phases of laser beams, then speckle occurrence is reduced, but the size of the display device is increased
Solution Approach 1:
The speckle reduction functionality is merged into the existing beam-shaping lens assembly, eliminating the need for separate optical components and reducing overall device footprint
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 reduces speckle occurrence using an optical element within the projection optical system, maintaining optical efficiency and enhancing display quality without the need for separate speckle reduction devices.
Implementation Method 1
a beam-shaping lens configured to shape at least one laser beam emitted from at least one light source, and transmit the shaped laser beam to a panel
Implementation Method 2
a vibration unit configured to vibrate the beam-shaping lens in directions of two or more vibration axes such that a direction of the laser beam to be transmitted to the panel is changed to form a plurality of different patterns
Data Source
AI summary
A speckle reduction device includes: a beam-shaping lens to shape at least one laser beam emitted from at least one light source, and to transmit the shaped laser beam to a panel; and a vibration unit to vibrate the beam-shaping lens in directions of two or more vibration axes such that a direction of the laser beam to be transmitted to the panel is changed to forms a plurality of different patterns.