LED Module Reflection Plate for Light Extraction
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Solution Overview
Problem
Conventional light emitting diode (LED) modules have low light extraction efficiency, resulting in decreased luminous efficiency due to light being emitted in non-optimal directions, leading to significant losses and reduced illuminating performance.
Innovation Solution
Incorporating a reflection plate between the light emitting chip and the phosphor layer, with a concavo-convex pattern on its surface, to reflect and diverge light emitted by the phosphor layer, thereby increasing the amount of light emitted outward and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional LED module structure with multiple resin layers is used, then the device is easy to manufacture, but the light extraction efficiency is low resulting in decreased luminous efficiency
Solution Approach 1:
The reflection plate is provided with a concave-convex pattern on its light-emitting surface, creating curved reflective surfaces that diverge light in multiple directions. This curvature pattern increases light extraction efficiency by redirecting light that would otherwise be trapped, while the reflection plate itself remains a simple planar component that is easy to manufacture and integrate into the existing LED module structure.
2Illumination intensity
If light is emitted in all directions by the phosphor layer, then complete light coverage is achieved, but light emitted in downward direction is lost reducing luminous efficiency
Solution Approach 1:
The reflection plate converts the harmful effect of downward-emitted light (which would be lost and reduce luminous efficiency) into a beneficial effect by reflecting this light back upward through the phosphor layer. The concave-convex pattern on the reflection plate ensures that reflected light is diverged in multiple directions, including back through the phosphor layer to exit through the top surface, thereby converting energy loss into useful light output.
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
The solution increases luminous efficiency by 17% compared to conventional LED modules, as measured by lumens per watt of supplied power, by effectively redirecting and emitting light in all desired directions, improving the illuminating performance.
Implementation Method 1
a reflection plate that is disposed between the light emitting chip and the phosphor layer, and that reflects the light emitted from the phosphor layer
Implementation Method 2
light emitted from the blue or ultraviolet light emitting diode and incident on the phosphor material transmits energy to the phosphor material, and thus light with a longer wavelength than incident light is emitted
Data Source
AI summary
A light emitting diode module having improved luminous efficiency is provided. The light emitting diode module includes: a light emitting chip; a phosphor layer formed of phosphor materials emitting light having a wavelength longer than the light emitted from the light emitting chip using light emitted from the light emitting chip as an excitation source; and a reflection plate that is disposed between the light emitting chip and the phosphor layer and that reflects the light emitted by the phosphor layer.