Segmented LED Cell Layout for Stable Automotive Light Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automotive light emitting devices face instability due to fluctuating battery voltage, leading to inefficient energy use and increased size due to heat generation, which limits their usability in narrow spaces.
Innovation Solution
A light emitting device with a base substrate, multiple light-emitting cells connected in series by connection metal layers, and controlled by a control unit to manage current distribution, allowing for various light-emitting patterns and efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light emitting device uses a single light-emitting cell, then the device structure is simple, but the device cannot adapt to fluctuating voltage and releases excess energy as heat
Solution Approach 1:
The light emitting device is divided into multiple light-emitting cells (first, second, third, and fourth light-emitting cells) that can be independently controlled. Each cell can be selectively activated or deactivated based on the input voltage level, allowing the device to adapt to fluctuating voltage while maintaining energy efficiency by matching the number of active cells to the available voltage.
2Reliability
If the light emitting device includes multiple light-emitting cells connected in series, then the device can adapt to voltage fluctuations, but the device size increases due to heat sink requirements
Solution Approach 1:
The device employs a dynamic control mechanism where the control unit selectively activates specific light-emitting cells based on the detected voltage level. This dynamic adaptation allows the device to maintain reliable operation across voltage fluctuations without requiring a heat sink sized for maximum power dissipation, thereby reducing overall device volume.
3Illumination intensity
If the light emitting device operates at high voltage, then the light emission intensity is high, but the energy efficiency decreases due to heat generation
Solution Approach 1:
Instead of always operating all light-emitting cells at high voltage, the control unit applies partial action by selectively activating only the necessary number of cells based on the input voltage. When voltage is high, more cells can be activated to increase light intensity; when voltage is low, fewer cells are activated to maintain energy efficiency, preventing excessive heat generation.
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 solution stabilizes light emission and improves energy efficiency by managing current distribution, reducing heat generation, and maintaining a compact size suitable for narrow spaces.
Implementation Method 1
a plurality of light-emitting cells arranged on a surface of the base substrate to emit light
Implementation Method 2
a plurality of connection metal layers connecting the plurality of light-emitting cells so that the plurality of light-emitting cells are electrically connected in series
Data Source
AI summary
A light-emitting device according to an embodiment includes: a base substrate; a plurality of light-emitting cells disposed on the surface of the base substrate and configured to generate light; a plurality of connection metal layers for connecting the plurality of light-emitting cells so that the plurality of light-emitting cells are electrically connected in series; a plurality of bump pads respectively disposed on the plurality of connection metal layers; and a control unit configured to apply current to at least some of the plurality of bump pads so that light is generated from at least one of the plurality of light-emitting cells.