Optical Light Distribution in Vehicle Emitters to Reduce Driver Glare
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Solution Overview
Problem
The light emitted by light emitting devices in vehicles can interfere with drivers, posing safety concerns.
Innovation Solution
A light emitting device with an optical structure that adjusts the output light distribution by defining specific luminance values for different polar angles, ensuring the luminance at certain angles is reduced to minimize interference with drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light emitting device emits light with high luminance in all directions, then the display brightness and visibility are improved, but the interference with drivers increases causing safety problems
Solution Approach 1:
The patent applies local quality by creating non-uniform luminance distribution across different angular regions. The optical structure selectively adjusts luminance in specific polar angle ranges (e.g., reducing luminance in the 75-85 degree range that corresponds to driver viewing angles) while maintaining or enhancing luminance in other regions for display visibility, thereby achieving spatially differentiated light properties
Solution Approach 2:
The patent changes the luminance parameter as a function of polar angle. By defining specific luminance values L1-L4 at different polar angle ranges and establishing relationships between them (such as L3 < L2 and (L2+L3) > (L1+L4)), the optical structure transforms the light emission characteristics to reduce driver interference while preserving display functionality
2Object-affected harmful factors
If the optical structure is designed to reduce luminance in driver-facing directions, then driver interference is minimized, but the overall light output and display effectiveness may be reduced
Solution Approach 1:
The patent optimizes the luminance distribution parameters L1-L4 to achieve a balance where luminance is reduced only in specific angular ranges affecting drivers, while maintaining sufficient overall light output. The mathematical relationships between L1-L4 ensure that reduction in driver-facing directions does not excessively compromise total luminous flux
Solution Approach 2:
The optical structure applies selective luminance modification only in specific angular regions rather than uniformly reducing light output in all directions. This localized approach preserves light output in directions that do not interfere with drivers, thereby maintaining display effectiveness while reducing harmful interference
Data Source
AI summary
A light emitting device emitting an output light includes an optical structure. A sub light is defined as the output light corresponding to an azimuth angle, a first value L1 is a sum of a luminance of the sub light corresponding to a polar angle from 115 to 125 degrees, a second value L2 is a sum of a luminance of the sub light corresponding to a polar angle from 95 to 105 degrees, a third value L3 is a sum of a luminance of the sub light corresponding to a polar angle from 75 to 85 degrees, a fourth value L4 is a sum of a luminance of the sub light corresponding to a polar angle from 55 to 65 degrees. The first value L1, the second value L2, the third value L3 and the fourth value L4 satisfy L3≠L2, and (L2+L3)>(L1+L4).