Light Emitting Device With Segmented Luminance Control
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Solution Overview
Problem
Street lamps cause visual discomfort due to sudden increases in luminance when transitioning from illuminated to non-illuminated areas, leading to glare, which is a prominent issue in improving visual comfort.
Innovation Solution
A light emitting device with a first and second light emitting module, where the first light emitting module has a higher luminance than the second, and both luminances are separately controlled to create a visual buffer and reduce glare, featuring a housing with a first light emitting area and a surrounding second light emitting area, with the second area's luminance adjusted to mitigate glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single high-luminance light emitting module is used to illuminate the road surface, then the illumination intensity is sufficient, but the sudden increase in luminance causes glare and visual discomfort
Solution Approach 1:
The light emitting device is divided into two distinct modules: a first light emitting module with high luminance for road illumination and a second light emitting module with lower luminance to reduce glare. This segmentation allows each module to perform its specific function optimally without causing visual discomfort
Solution Approach 2:
Different regions of the light emitting device are assigned different luminance characteristics. The first light emitting module (central region) provides high luminance for effective road illumination, while the second light emitting module (surrounding region) provides lower luminance to prevent glare, creating local quality variations that simultaneously satisfy illumination requirements and visual comfort
2Illumination intensity
If the luminance of the light emitting module is increased to improve illumination, then the illumination area is adequately covered, but the visual comfort deteriorates due to glare
Solution Approach 1:
The illumination function is segmented between two modules with different luminance levels. The first module ensures adequate illumination coverage while the second module maintains visual comfort, allowing the system to achieve both objectives simultaneously through functional division
Solution Approach 2:
The light emitting device creates local quality differences by assigning high luminance to the central first module for illumination coverage and lower luminance to the surrounding second module for visual comfort, enabling different regions to serve different purposes
3Device complexity
If a single uniform luminance is used across the light emitting surface, then the device structure is simple, but it cannot provide visual buffer to reduce glare
Solution Approach 1:
The light emitting device is segmented into two modules with different luminance characteristics. This segmentation introduces the necessary complexity to reduce glare while maintaining relatively simple overall device architecture, as the two modules can be integrated into a single housing structure
Solution Approach 2:
The device implements local quality variations by assigning different luminance levels to different regions (first module vs. second module). This allows the system to provide visual buffer and reduce glare without requiring complex control systems, as the luminance differentiation is built into the structural design
Data Source
AI summary
The present invention discloses a light emitting device. The light emitting device includes a housing, a first light emitting module and a second light emitting module. The first light emitting module is provided with a first light emitting area and is disposed on the housing. The second light emitting module is provided with a second light emitting area and is disposed on the housing and surrounds the first light emitting module. A first luminance in the first light emitting area is higher than a second luminance in the second light emitting area, and the first luminance and the second luminance are separately controlled.