Laser Illumination Unit Oscillation Stop Interference Pattern Control
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Solution Overview
Problem
Projectors using laser light sources suffer from speckle patterns, which degrade display quality due to interference patterns that cannot be effectively reduced when the optical device oscillation stops, leading to decreased user convenience.
Innovation Solution
An illumination unit with a laser light source, an optical device that oscillates to reduce speckle patterns, and a control section that decreases light brightness or alerts users when oscillation stops, ensuring continuous reduction of interference patterns regardless of the optical device's operation state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical device oscillates to reduce speckle patterns, then display quality is improved, but the system becomes vulnerable to interference pattern generation when oscillation stops
Solution Approach 1:
The control section continuously monitors the oscillation state of the optical device and provides feedback control. When oscillation stops are detected, the system automatically implements corrective measures (brightness reduction or user notification) to maintain display quality and prevent interference pattern generation.
Solution Approach 2:
The system prepares compensatory measures in advance for potential oscillation stoppage. By having pre-programmed responses (brightness reduction or user alerts) ready before oscillation failure occurs, the system ensures continuous display quality maintenance without interruption or degradation.
2Device complexity
If the oscillation of the optical device stops, then the device complexity is reduced, but the interference pattern reduction function becomes ineffective
Solution Approach 1:
The control section monitors oscillation state and triggers compensatory actions when oscillation stops, ensuring interference pattern reduction remains effective regardless of oscillation status.
Solution Approach 2:
When oscillation stops, the system changes operational parameters by reducing light source brightness to a lower level that prevents interference pattern generation, maintaining display quality through parameter adjustment rather than mechanical operation.
3Object-generated harmful factors
If the light source brightness is decreased when oscillation stops, then interference patterns are reduced, but the illumination intensity is lowered
Solution Approach 1:
The system has pre-programmed brightness reduction levels ready for immediate activation when oscillation stops. This preparatory measure ensures smooth transition to interference-pattern-free operation without abrupt changes or quality degradation.
Solution Approach 2:
The control section dynamically adjusts the light source brightness parameter based on oscillation status. When oscillation stops, the brightness is reduced to an optimal level that eliminates interference patterns while preserving sufficient illumination for acceptable display quality.
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
The solution effectively minimizes the occurrence of interference patterns even when the optical device stops oscillating, maintaining display quality and enhancing user convenience by providing alerts or adjusting light output.
Implementation Method 1
The speckle pattern is generated due to interference of light diffused by points on the diffusing surface in a random phase relationship corresponding to a microscopic irregularity on the surface
Implementation Method 2
the human eye and brain cannot discriminate a flicker of an image in the range from approximately 20 to 50 ms. In other words, images within that time range are integrated and averaged in the human eye
Data Source
AI summary
There are provided an illumination unit and a display apparatus which are capable of improving convenience for users. The illumination unit includes a light source section including a laser light source, an optical device allowing a laser beam from the laser light source to pass therethrough, a drive section allowing the optical device to oscillate, and a control section performing one or both of control of decreasing brightness of emitted light from the light source section and control of outputting to the outside information that oscillation of the optical device has been stopped when the oscillation of the optical device has been stopped during drive operation by the drive section.