Light Source With Voltage-Thresholded LED Groups
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Solution Overview
Problem
Existing lighting devices with light-emitting elements connected in series face challenges in efficient voltage management, where all elements are not uniformly activated, leading to suboptimal lighting performance and alignment issues during assembly.
Innovation Solution
A lighting device with a substrate having first and second electrodes, where light-emitting elements are grouped and connected in series, with a first light-emitting element activated at a lower voltage and subsequent elements activated at a higher voltage, allowing for precise positioning and efficient voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all light-emitting elements are connected in series with the same voltage threshold, then the circuit is simple to design, but uniform lighting performance cannot be achieved when voltage varies
Solution Approach 1:
The patent applies local quality by differentiating the voltage thresholds of light-emitting elements based on their positions. The first light-emitting element has a first voltage threshold, while second light-emitting elements have a second voltage threshold that is higher than the first. This local differentiation ensures that elements at different positions activate at appropriate voltage levels, achieving uniform lighting performance across the entire array despite voltage variations.
2Device complexity
If light-emitting elements are arranged without a reference indicator, then the structure is simpler, but alignment precision during assembly deteriorates
Solution Approach 1:
The patent implements self-service by making the first light-emitting element serve dual functions: as a regular light-emitting element and as a reference indicator for alignment. When voltage exceeds the first voltage threshold, this element emits light first, automatically providing a visual reference for center alignment during assembly without requiring additional external indicators or complex positioning structures.
3Use of energy by moving object
If voltage is applied without differentiated thresholds, then power consumption is lower, but lighting performance becomes suboptimal
Solution Approach 1:
The patent applies preliminary action by designing the voltage threshold hierarchy in advance, where the first light-emitting element is configured with a lower threshold to activate first. This preliminary configuration ensures that as voltage increases from low to high, elements activate in the optimal sequence, achieving uniform lighting performance across different voltage conditions without requiring excessive power consumption.
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
This configuration enables uniform lighting and facilitates easier alignment and assembly by allowing the first light-emitting element to indicate the center of the light source, improving overall performance and manufacturing efficiency.
Implementation Method 1
a first light-emitting element 1d that is configured to start emitting light when a voltage applied to the light-emitting elements 1 exceeds a first voltage value, and the light-emitting elements 1 except the first light-emitting element 1d are configured to start emitting light when the voltage exceeds a second voltage value that is higher than the first voltage value
Data Source
AI summary
In a first aspect of the present inventive subject matter, a light source includes a substrate that includes a first electrode and a second electrode, and light-emitting elements arranged in an area and divided into groups each including a same number N of light-emitting elements that are electrically connected to one another in series in each group of the groups and that are electrically connected in series to the first electrode and to the second electrode of the substrate, and the light-emitting elements include a first light-emitting element that is configured to start emitting light when a voltage applied to the light-emitting elements exceeds a first voltage value, and the light-emitting elements except the first light-emitting element are configured to start emitting light when the voltage exceeds a second voltage value that is higher than the first voltage value. Also, a lighting device including the light source is disclosed.