LED Package Light Guide Structure for Uniform Brightness
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Solution Overview
Problem
Existing LED packages suffer from uneven brightness and dark bands between adjacent packages, leading to reduced overall brightness uniformity.
Innovation Solution
The LED package incorporates a first light guide with reflective surfaces positioned between LED units, reflecting light towards the side surfaces of the encapsulant to enhance light-emitting angle and reduce efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted directly from LED units without light guide, then light-emitting intensity is high, but light-emitting angle is narrow and brightness uniformity is poor
Solution Approach 1:
A light guide is introduced as an intermediary component between the LED units and the external environment. The light guide receives light from the LED units and redistributes it through its side surfaces, achieving uniform brightness and expanded light-emitting angle without directly modifying the LED units themselves.
Solution Approach 2:
The light guide transforms the light distribution from a point-source radial pattern to a planar surface emission pattern. By utilizing the side surfaces of the light guide as emission surfaces, the light is distributed across a two-dimensional area, achieving uniform brightness and wide viewing angle.
2Illumination intensity
If light guide reflects light toward side surfaces, then light-emitting angle is enhanced, but light loss increases
Solution Approach 1:
The light guide is designed with reflective surfaces and specific geometric features before light enters, to pre-direct and concentrate light toward the side surfaces. This preliminary arrangement ensures that light is efficiently redirected without requiring multiple reflections, minimizing energy loss while achieving enhanced light-emitting angle.
3Productivity
If multiple LED packages are arranged closely, then device integration is improved, but dark bands appear between packages reducing brightness uniformity
Solution Approach 1:
Adjacent light guides are designed to have their side surfaces positioned close together, creating a continuous or near-continuous light-emitting surface when multiple packages are arranged. This merging of light-emitting surfaces eliminates dark bands and achieves uniform brightness across the entire device.
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 effectively improves light-emitting angle and reduces light loss, resulting in enhanced brightness uniformity and efficiency.
Implementation Method 1
The first light guide includes a plurality of reflective surfaces positioned between the top portion and the bottom portion, and each reflective surface corresponds to a respective LED unit to reflect a portion of the light emitted from the LED units toward the side surfaces of the encapsulant
Data Source
AI summary
A light-emitting diode (LED) package is provided, which includes a plurality of LED units, an encapsulant, and a first light guide. The encapsulant covers the LED units and has a recessed portion. The recessed portion is between the LED units, and the encapsulant has a plurality of side surfaces surrounding the LED units and the recessed portion. The first light guide is disposed in the recessed portion of the encapsulant, wherein the first light guide has a top portion and a bottom portion, with the top portion having a larger area than the bottom portion. The first light guide includes a plurality of reflective surfaces between the top portion and the bottom portion, and each reflective surface corresponds to a respective LED unit to reflect a portion of the light emitted from the LED units toward the side surfaces of the encapsulant.