LED Light Exit Layout for Directional Irradiation Uniformity
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Solution Overview
Problem
Existing light-emitting devices with uniformly connected LED elements struggle to enhance irradiation in a specific direction due to equal light emission, making it difficult to achieve directional control and leading to color unevenness.
Innovation Solution
The device employs a configuration with two distinct light-emitting element groups, where the first group has higher average luminance at the centroid and the second group has lower luminance, with tighter spacing between elements to reduce color unevenness and enhance directional lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED elements are connected in identical parallel groups with equal current, then the device is simple to manufacture and maintains stable operation, but directional irradiation enhancement is difficult to achieve
Solution Approach 1:
The patent applies local quality by creating different light emission characteristics in different regions of the light-emitting surface. Specifically, it defines a first light-emitting element group with a first average luminance and a second light-emitting element group with a second average luminance, where the first average luminance is higher than the second average luminance. This local differentiation enables enhanced irradiation in the direction of the first light-emitting element group while maintaining overall device functionality and manufacturability.
2Illumination intensity
If LED elements are densely arranged to increase luminance, then directional irradiation is enhanced, but color unevenness occurs
Solution Approach 1:
The patent addresses color unevenness by locally differentiating the light emission characteristics. By ensuring that the first light-emitting element group has a higher average luminance than the second light-emitting element group, and by controlling the clearance between elements in each group, the patent achieves both enhanced directional irradiation and reduced color unevenness. The local quality approach allows different regions to compensate for each other, maintaining overall color uniformity while enhancing specific directional irradiation.
3Device complexity
If identical current is supplied to all LED elements, then the device structure is simple, but light emission variation occurs
Solution Approach 1:
The patent applies local quality by creating different light emission characteristics in different regions. It defines a first light-emitting element group with a first average luminance and a second light-emitting element group with a second average luminance, where the first average luminance is higher than the second average luminance. This local differentiation enables enhanced irradiation in the direction of the first light-emitting element group while maintaining overall device functionality and manufacturability.
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 configuration allows for efficient directional irradiation with reduced color unevenness and lower energy consumption, contributing to environmentally friendly lighting with less light pollution.
Implementation Method 1
a plurality of first light-emitting elements (31) and a plurality of second light-emitting elements (32) which are configured to emit light by supplying electric power between the pair of power supply terminals
Data Source
AI summary
A light-emitting device includes a substrate, power supply terminals on the substrate, first light-emitting elements and second light-emitting elements configured to emit light by supplying electric power between the power supply terminals, and a light exit surface configured to allow exit of light emitted from these light-emitting elements. The light exit surface includes a first light exit region being a plane region, and second light exit regions being a plane region not including the first light exit region. A light-emitting element group has a first light-emitting element group configured with a plurality of first light-emitting elements in the first light exit region, and a second light-emitting element group configured with a plurality of second light-emitting elements in the second light exit region. An average luminance of light exited from the first light exit region is higher than that from the second light exit region.