Asymmetric Reflective Sidewall for Light Forwarding Angle Control
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Solution Overview
Problem
Conventional light emitting device packages lack the ability to adjust light forwarding angles effectively, leading to inefficient light distribution and potential losses in luminous efficiency, especially in thin form factor display devices.
Innovation Solution
The design incorporates an asymmetric reflective sidewall with varying heights and slope angles, including protrusions, around the light emitting device to adjust the light forwarding angle, allowing for customized light distribution and improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional symmetric reflective sidewall is used, then the device structure is simple, but the light forwarding angle cannot be adjusted effectively leading to inefficient light distribution
Solution Approach 1:
The reflective sidewall is designed with asymmetric structure where one sidewall has a first slope angle and another sidewall has a second slope angle different from the first. This asymmetry enables different light forwarding angles in different directions, allowing effective adjustment of light distribution patterns without requiring multiple separate optical components.
Solution Approach 2:
Different portions of the reflective sidewall are given different local properties through varying slope angles and heights. Specifically, adjacent sidewalls have different slope angles relative to the substrate, and protrusions are added to certain sidewalls with specific slope angles. This local differentiation enables precise control of light reflection angles in specific directions while maintaining a relatively simple overall structure.
2Length of moving object
If the display device thickness is reduced for slim form factor, then the aesthetic appeal and portability improve, but light quantity loss increases due to insufficient light guidance
Solution Approach 1:
The patent addresses the thickness reduction challenge by introducing vertical dimension features (protrusions with specific heights and slope angles) on the reflective sidewalls. These three-dimensional structures manipulate light reflection angles in the vertical dimension, enabling effective light guidance and distribution even when the overall device thickness is minimized, thus preventing light quantity loss in slim form factors.
Solution Approach 2:
The reflective sidewall structure incorporates adjustable slope angles and protrusion heights that can be optimized for different light forwarding requirements. This dynamic design capability allows the light guidance system to maintain high efficiency across varying device thicknesses, ensuring that light quantity loss is minimized regardless of the slim form factor constraints.
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 asymmetric light forwarding angle design enhances light distribution and reduces light quantity loss, particularly in slim display devices, by optimizing the reflection and guidance of light from the light emitting device package.
Implementation Method 1
a reflective sidewall disposed on the first lead frame and the second lead frame to surround the light emitting device
Data Source
AI summary
An embodiment discloses a light emitting device package including a first lead frame and a second lead frame disposed spaced from each other, a light emitting device disposed on the first lead frame, and a reflective sidewall disposed on the first lead frame and the second lead frame to surround the light emitting device, wherein a portion of the reflective sidewall has a height higher than the other portion of the reflective sidewall.