Stereoscopic Display Brightness Control Using Pulsed Fluorescent Scanning
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Solution Overview
Problem
Existing stereoscopic display devices fail to control the state of stereoscopic images based on the observation situation, such as brightness, contrast, or resolution, leading to suboptimal viewing experiences.
Innovation Solution
A stereoscopic display device that includes a laser light source, a converter, a scanner, a distance detector, and an intensity control unit to adjust the laser beam's intensity and focal distance based on observation distance and ambient illuminance, using a fluorescent material to emit light at controlled positions and intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser beam intensity is increased to improve image brightness, then the brightness is improved, but the fluorescent material may be damaged or the image contrast deteriorates
Solution Approach 1:
The patent applies periodic pulsed laser irradiation instead of continuous irradiation. The laser beam is emitted in pulses with specific duty cycles, allowing the fluorescent material to recover between pulses. This periodic action enables maintaining high average brightness while preventing material damage from cumulative energy absorption.
Solution Approach 2:
The patent dynamically changes laser irradiation parameters including intensity, pulse width, and duty cycle based on the required image brightness and material conditions. By adjusting these parameters adaptively, the system optimizes the balance between achieving sufficient brightness and preventing fluorescent material degradation.
2Illumination intensity
If the laser beam intensity is increased to improve image brightness, then the brightness is improved, but the image contrast and resolution deteriorate
Solution Approach 1:
The patent applies different laser irradiation intensities to different regions of the fluorescent material based on the image content requirements. High-intensity irradiation is applied to regions requiring high brightness, while lower intensities are applied to regions requiring high contrast and detail, enabling local optimization of image quality parameters.
Solution Approach 2:
By using pulsed irradiation with controlled duty cycles, the system can achieve high peak brightness when needed while maintaining lower average intensity in other regions. This temporal modulation enables simultaneous optimization of brightness and contrast/resolution across different image areas.
3Productivity
If the scanning speed is increased to improve productivity, then the productivity is improved, but the image quality and brightness deteriorate
Solution Approach 1:
The patent uses pulsed laser irradiation synchronized with the scanning motion. By concentrating energy into short pulses at specific moments during the scanning cycle, the system achieves high scanning speeds while maintaining sufficient irradiation intensity for quality image formation. The pulsed nature allows high peak power delivery without requiring continuous high power that would damage the material.
4Manufacturing precision
If the number of light emission positions is increased to improve resolution, then the resolution is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The patent employs fluorescent material that spontaneously emits light when irradiated by the laser beam. This self-emission characteristic eliminates the need for complex active control of individual emission positions. The system simply needs to control the laser irradiation positions and intensities, and the fluorescent material automatically provides the light emission, significantly reducing control system complexity while achieving high resolution.
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
Enables dynamic control of stereoscopic image states such as brightness, contrast, and resolution according to the observation situation, enhancing the viewing experience.
Implementation Method 1
a scanner configured to three-dimensionally scan a light condensing position of the laser beam by using a drawing space including a fluorescent material which is excited to spontaneously emit light with irradiation with a laser beam
Data Source
AI summary
A stereoscopic display device includes a laser light source, a converter configured to convert the laser beam to a collimated beam with a predetermined diameter, a scanner configured to three-dimensionally scan a light condensing position of the laser beam by using a drawing space including a fluorescent material which is excited to spontaneously emit light with irradiation with a laser beam as a scan target range and changing a focal distance at which the collimated beam converges and an optical axis direction in which the collimated beam is emitted, a distance detector configured to detect a distance between an observer who observes the drawing space and the drawing space, and a distance correction information acquiring unit configured to acquire distance correction information from a storage unit in which a correlation between the distance and an intensity of the laser beam is stored as the distance correction information.