Recessed LED Encapsulant Structure for Uniform Light Distribution
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Solution Overview
Problem
Existing light-emitting diode (LED) devices face challenges in adjusting light spot shape and achieving uniform brightness.
Innovation Solution
A light-emitting device design featuring a substrate, a light-emitting element, and a light-transmissive encapsulant with a recessed portion and surrounding portion, where the ratio of the encapsulant's bottom portion width to the element's width is greater than or equal to 0.3, allowing for improved light-emitting angle and brightness distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional encapsulant structure is used, then the device structure is simple, but the light-emitting angle is limited and brightness is non-uniform
Solution Approach 1:
The encapsulant is segmented into distinct functional regions: a recessed portion directly above the light-emitting element and a surrounding portion extending outward. This segmentation allows each region to perform its specific optical function - the recessed portion controls light extraction angle while the surrounding portion provides structural support and additional light distribution, thereby improving light-emitting angle and brightness uniformity without excessive complexity
Solution Approach 2:
Different portions of the encapsulant are designed with different geometries and optical properties. The recessed portion has a specific depth and width ratio (0.3≤w2/w3) optimized for light extraction, while the surrounding portion has different dimensional characteristics for structural support. This local differentiation of quality enables simultaneous optimization of light-emitting angle and brightness uniformity
2Illumination intensity
If the encapsulant bottom portion width is increased, then light-emitting angle improves, but the ratio constraint (w2/w3≥0.3) must be maintained
Solution Approach 1:
The patent establishes a specific parameter relationship (w2/w3≥0.3) that balances light-emitting angle improvement with manufacturability. By defining this quantitative constraint, the design transforms a complex optimization problem into a straightforward dimensional control requirement, enabling manufacturers to achieve improved light-emitting angle while maintaining precision through a clear design rule
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 design enhances light-emitting angle and uniformity, preventing excessive brightness or darkness, and maintaining light intensity, suitable for applications in display devices and various electronic apparatus.
Implementation Method 1
a light-transmissive encapsulant (30) disposed on the substrate (10) and surrounding the light-emitting element (20)
Implementation Method 2
The recessed portion (32) includes a bottom portion (32B) and a sidewall (32S) surrounding the bottom portion (32B). The surrounding portion (33) is located on the upper surface (30T). The surrounding portion (33) is connected to the sidewall (32S) of the recessed portion (32).
Data Source
AI summary
A light-emitting device and a display device are provided. The light-emitting device includes a substrate, a light-emitting element, and a light-transmissive encapsulant. The light-emitting element is disposed on the substrate. The light-transmissive encapsulant is disposed on the substrate and surrounds the light-emitting element. The light-transmissive encapsulant has an upper surface and a bottom surface. The light-transmissive encapsulant includes a recessed portion and a surrounding portion. The recessed portion is located on the upper surface, directly above the light-emitting element. The recessed portion includes a bottom portion and a sidewall surrounding the bottom portion. The surrounding portion is located on the upper surface and connected to the sidewall of the recessed portion. The surrounding portion extends outward to the bottom surface. A ratio of a width of the bottom portion to a width of the light-emitting element is greater than or equal to 0.3.