Flip-Chip LED Light-Splitting Structure for Wide-Angle Emission
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Solution Overview
Problem
Existing large-angle mini LEDs face challenges in achieving both wide light emission angles and high light-emitting efficiency due to light absorption during multiple reflections within the chip, particularly when using reflective layers like metal vapor deposition and DBR.
Innovation Solution
A flip-chip light-emitting diode structure with a light-splitting layer that reflects light at specific complementary angles and transmits light at other angles, reducing internal absorption and enhancing light emission from the side surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If reflective layers such as metal vapor deposition and DBR are used on the light-emitting surface to control light emission from the side, then the light-emitting angle is improved, but the light-emitting efficiency deteriorates due to light absorption during multiple reflections
Solution Approach 1:
The patent segments the light emission control into two distinct functional layers: a light-splitting layer with specific refractive index for angle control and an insulating reflective layer for efficiency enhancement. This segmentation allows each layer to perform its specialized function without the trade-off present in conventional single-layer designs, resolving the contradiction between light-emitting angle and light-emitting efficiency
Solution Approach 2:
The patent applies local quality by positioning the light-splitting layer with specific optical properties (refractive index between 1.3-1.7) at the light-emitting surface for angle control, while the insulating reflective layer with high reflectivity is positioned at the backlight surface for efficiency enhancement. Each layer has locally optimized properties tailored to its specific function, eliminating the need for compromise
2Shape
If multiple reflections are used to achieve large-angle light emission, then the light-emitting angle is improved, but light is absorbed by the epitaxial layer and metal during reflection, reducing light-emitting efficiency
Solution Approach 1:
The patent introduces an insulating reflective layer as an intermediary between the epitaxial layer and the metal contact layer. This intermediary layer prevents direct interaction between light and the metal, eliminating light absorption while maintaining the reflective function needed for large-angle emission. The light-splitting layer acts as another intermediary to control light distribution angles
Solution Approach 2:
The patent converts the potentially harmful light absorption by metal into a benefit by introducing the insulating reflective layer that reflects light without absorption. The metal layer's reflective property is preserved and enhanced while its harmful absorptive property is eliminated, turning a disadvantage into an advantage for light-emitting efficiency
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 light-splitting layer improves light-emitting angle and efficiency by minimizing light leakage and absorption, resulting in enhanced brightness and symmetry of light emission.
Implementation Method 1
The light-splitting layer is configured to reflect predetermined light with an incident complementary angle of a first angle, transmit predetermined light with an incident complementary angle of a second angle, and reflect predetermined light with an incident complementary angle of a third angle
Implementation Method 2
The light-splitting layer is configured to reflect predetermined light with an incident complementary angle of a first angle, transmit predetermined light with an incident complementary angle of a second angle, and reflect predetermined light with an incident complementary angle of a third angle
Implementation Method 3
The insulating reflective layer is configured to reflect incident predetermined light
Data Source
AI summary
A light-emitting element, a light-emitting device and a display device are provided, which relate to the technical filed of semiconductor devices. The light-emitting element is a flip-chip light-emitting diode, and has a light-emitting surface and a backlight surface respectively located on outermost sides of the flip-chip light-emitting diode and opposite to each other; the flip-chip light-emitting diode includes an epitaxial staked layer configured to generate predetermined light; and a light-splitting layer disposed on a side of the epitaxial stacked layer proximate to the light-emitting surface; the light-splitting layer is configured to reflect predetermined light with an incident complementary angle of a first angle, transmit predetermined light with an incident complementary angle of a second angle, and reflect predetermined light with an incident complementary angle of a third angle; and the first angle is smaller than the second angle, and the second angle is smaller than the third angle.