Angular Luminance Control in Vehicle Light Emitting Devices
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Solution Overview
Problem
Light emitting devices in vehicles can interfere with drivers, causing safety issues due to the glare from the emitted light, which existing technologies have not adequately addressed.
Innovation Solution
A light emitting device with a light adjustment structure that modifies the luminance distribution of the output light based on specific polar and azimuth angles to reduce glare, ensuring that the light emitted is minimized in directions affecting the driver, while maintaining effective illumination for other users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting device is disposed in vehicle, then illumination function is provided, but light interference to driver occurs
Solution Approach 1:
The patent applies local quality by creating non-uniform luminance distribution across different angular regions. The light emitting device emits light with varying luminance values at different polar angles, specifically reducing luminance in the driver's field of view direction while maintaining higher luminance in other directions. This angular-dependent luminance control allows the same light source to provide adequate illumination for passengers while minimizing glare to the driver.
Solution Approach 2:
The patent implements parameter changes by modifying the luminance parameter as a function of polar angle. The light emitting device is designed to emit light with luminance values that change according to the observation angle, with specific luminance ratios defined between different angular ranges. This parameter variation enables the device to adapt its illumination characteristics based on the viewer's position, effectively reducing driver interference while maintaining illumination functionality.
2Reliability
If luminance is reduced in driver's direction, then safety is improved, but illumination effectiveness for other users may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the illumination space into different angular zones with distinct luminance requirements. The luminance distribution is segmented into multiple polar angle ranges, each with specific luminance values or ratios defined. This segmentation allows independent optimization of illumination for different user groups - passengers in certain angular ranges receive adequate illumination while the driver's direction experiences reduced luminance to improve safety.
Solution Approach 2:
The patent implements local quality by providing differentiated illumination quality across different spatial zones. Each angular zone receives light with luminance characteristics tailored to its specific usage requirements. Passenger areas maintain higher luminance for effective illumination, while the driver's field of view direction experiences reduced luminance to enhance safety, achieving both goals simultaneously through spatially differentiated light distribution.
Data Source
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AI summary
A light emitting device (LD) emitting an output light (OL) includes a light adjustment structure (LS1,LS2,LS3,LS4,LS5,LS6,LS7). A sub light (SL1,SL2) is defined as the output light (OL) corresponding to an azimuth angle (ϕ1, ϕ2), a first value L1 is a sum of a luminance of the sub light (SL1,SL2) corresponding to a polar angle (θ1,θ2) from 115 to 125 degrees, a second value L2 is a sum of a luminance of the sub light (SL1,SL2) corresponding to a polar angle (θ1,θ2) from 95 to 105 degrees, a third value L3 is a sum of a luminance of the sub light (SL1,SL2) corresponding to a polar angle (θ1,θ2) from 75 to 85 degrees, a fourth value L4 is a sum of a luminance of the sub light (SL1,SL2) corresponding to a polar angle (θ1,θ2) from 55 to 65 degrees, wherein L3<L2, and 1.23≤(L1*L3)/(L2*L4)≤2.92.