Low-Voltage LED Light Strip with Constant Current Segmentation
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Solution Overview
Problem
Existing low-voltage LED light strips suffer from severe light attenuation, instability, and poor uniformity due to voltage differences and refractive index mismatches between LED chips and encapsulants, limiting their length and usability.
Innovation Solution
A low-voltage light strip design featuring a constant current circuit, an LED light string with a transparent ceramic film as a first optical layer between the LED chip and encapsulant, and a flexible protective sleeve with a second optical layer to reduce refractive index differences and enhance light emission efficiency and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a low-voltage LED light strip is made longer, then the coverage area increases, but the voltage drop becomes more severe causing head-tail brightness difference
Solution Approach 1:
The light strip is divided into multiple independent light-emitting units, each with its own constant current circuit. This segmentation allows each unit to operate independently with stable current, eliminating the cumulative voltage drop effect that occurs in series-connected long strips, thereby maintaining uniform brightness across the entire extended length.
Solution Approach 2:
A constant current circuit is introduced as an intermediary between the power source and the LED light string. This intermediary component actively regulates and stabilizes the current flowing through the LEDs, compensating for voltage variations and ensuring consistent brightness regardless of the light strip's length.
2Loss of energy
If high refractive index encapsulant is used to reduce light loss, then light extraction from LED chip improves, but refractive index mismatch with LED chip remains large causing reflection loss
Solution Approach 1:
A first optical layer with intermediate refractive index is introduced as a mediator between the LED chip and the encapsulant. This intermediate layer has a refractive index that is higher than the LED chip material but lower than the encapsulant, creating a gradual transition that reduces reflection and improves light extraction efficiency.
Solution Approach 2:
The refractive index parameter is changed by introducing a multi-layer structure with progressively different refractive indices. The first optical layer has a refractive index of 1.6-2.0, which is higher than the LED chip material (typically 2.2-2.5) but lower than the encapsulant (typically 1.4-1.5), creating an optimized optical pathway that reduces reflection loss.
3Loss of energy
If high refractive index protective sleeve is used to improve light extraction, then light emission efficiency improves, but refractive index difference with air causes light loss at outer surface
Solution Approach 1:
A second optical layer is introduced as an intermediary between the protective sleeve and the air. This second optical layer has a refractive index lower than the protective sleeve but higher than air, creating a gradual refractive index transition that reduces reflection and improves light extraction from the protective sleeve outer surface.
4Illumination intensity
If constant current circuit is added to each light-emitting unit, then brightness uniformity improves, but device complexity increases
Solution Approach 1:
The light strip is divided into multiple independent light-emitting units, each with its own constant current circuit. This segmentation allows each unit to operate independently with stable current, eliminating the cumulative voltage drop effect that occurs in series-connected long strips, thereby maintaining uniform brightness across the entire extended length.
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 ensures consistent brightness along the light strip, increases light emission efficiency, and allows for longer, more adaptable ultra-long low-voltage LED strips with improved uniformity and extended service life.
Implementation Method 1
a first optical layer arranged between the encapsulant and the LED chip; the first optical layer covers a surface of the LED chip, a refractive index thereof being between a refractive index of the LED chip and a refractive index of the encapsulant
Implementation Method 2
a surface of the flexible protective sleeve is provided with a second optical layer, a refractive index of the second optical layer being between the refractive index of the flexible protective sleeve and a refractive index of air
Data Source
AI summary
The present invention discloses a low-voltage light strip including a light strip body, a light-emitting unit and a flexible protective sleeve; wherein, each light-emitting unit includes a constant current circuit and an LED light string, the LED light string including an LED light bead; the LED light bead includes an LED chip, an encapsulant, and a first optical layer arranged between the encapsulant and the LED chip; a surface of the flexible protective sleeve is provided with a second optical layer. By providing the constant current circuit, the invention achieves a uniform head and tail brightness as well as an ultra-long connection of the low-voltage light strip. Total reflection of light is also avoided by an arrangement of a first and a second optical layers, thereby improving the light-emitting efficiency.