Laser Projection Display Light Adjustment Level Control
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Solution Overview
Problem
Portable image display apparatuses face challenges in adjusting light levels across various brightness environments, particularly in low luminance conditions, while maintaining image quality.
Innovation Solution
The apparatus includes a laser light source unit, a scanning mirror unit, a light source driving unit, a bit shift processing unit, and a dimming processing unit that adjusts pixel brightness through bit shifting and dimming processing to achieve a wide range of light adjustment levels, ensuring image quality across different luminance conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser light source emits light at high intensity to ensure visibility in bright environments, then the image is visible in high luminance conditions, but the image quality deteriorates in low luminance conditions due to excessive brightness
Solution Approach 1:
The patent implements dynamic adjustment of laser beam intensity through a light adjustment level determination unit that adapts the emission intensity based on ambient luminance conditions. The system switches between multiple light adjustment levels (first light adjustment level for bright environments, second light adjustment level for dark environments) to optimize both visibility and image quality across varying luminance conditions.
2Reliability
If the laser beam intensity is reduced for low luminance environments, then image quality improves in dark conditions, but the image becomes invisible or hard to see in bright environments
Solution Approach 1:
The system dynamically adapts laser beam intensity to ambient luminance conditions by determining the appropriate light adjustment level. In dark environments, the system selects a lower light adjustment level to prevent excessive brightness and maintain image quality, while in bright environments, it selects a higher light adjustment level to ensure visibility.
3Device complexity
If the image display apparatus uses a fixed light emission level, then the device complexity is reduced, but the adaptability to various brightness environments deteriorates
Solution Approach 1:
The patent introduces a light adjustment level determination unit that dynamically selects between multiple pre-defined light adjustment levels based on ambient luminance detection. This dynamic approach enables the system to adapt to various brightness environments without requiring complex real-time intensity modulation, thus maintaining relatively simple device architecture while achieving high adaptability.
Solution Approach 2:
The system changes the light emission parameter (intensity level) based on detected ambient luminance conditions. By implementing multiple discrete light adjustment levels and selecting the appropriate level according to environmental brightness, the system achieves adaptability to various brightness environments while keeping the control mechanism relatively simple.
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
This solution allows for precise adjustment of light levels, enabling clear image display in varying brightness environments without compromising image quality, by controlling pixel brightness and emission intensity.
Implementation Method 1
a laser light source unit configured to output a luminous flux
Implementation Method 2
a scanning mirror unit configured to reflect the luminous flux by reciprocating driving in a main-scanning direction and a sub-scanning direction
Data Source
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AI summary
A light source unit configured to output a luminous flux, a scanning mirror unit configured to reflect the luminous flux from the light source unit by reciprocating driving in a main-scanning direction and a sub-scanning direction, a light source driving unit configured to drive the light source unit based on image data, and a dimming processing unit configured to control brightness of a display image by not displaying a pixel included in the image data according to a predetermined rule are included. In a laser scanning type projection display, it is possible to further secure a lower limit of a light adjustment level while keeping image quality.