LED Light Collecting Structure With Reflective Sidewalls
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Solution Overview
Problem
Light emitting display devices face issues with deteriorated luminous efficiency and shortened lifespan due to light leakage and increased power consumption, particularly in outdoor applications requiring high luminance.
Innovation Solution
A display device structure featuring a substrate with a light emitting diode, an insulating layer, a light collecting structure with a reverse tapered shape, and a reflective layer on the side surface to reflect light towards the upper portion, improving luminous efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diode is used to achieve high luminance, then luminance is improved, but luminous efficiency deteriorates due to light leakage to the periphery
Solution Approach 1:
The patent converts the harmful light leakage to the periphery into a beneficial effect by introducing a reflective layer that redirects the leaked light back toward the upper portion of the LED, transforming energy loss into useful light output and improving luminous efficiency
Solution Approach 2:
The patent adds a vertical dimension to light management by using a reflective layer positioned below the LED to redirect downward-leaking light upward, creating a three-dimensional light control structure that recovers otherwise lost light paths
2Illumination intensity
If higher current is applied to compensate for light leakage, then luminance is maintained, but power consumption increases
Solution Approach 1:
The reflective layer converts wasted light energy into useful illumination, allowing the LED to maintain high luminance output without increasing input current, thereby reducing power consumption while preserving brightness
3Illumination intensity
If higher current is applied to compensate for light leakage, then luminance is maintained, but heat generation increases and lifespan shortens
Solution Approach 1:
The reflective layer recovers light energy that would otherwise be wasted, reducing the need for higher current operation and consequently decreasing heat generation, which extends LED lifespan and improves reliability
Solution Approach 2:
The reflective layer provides a preventive measure against heat generation by recovering light energy before it is completely lost, cushioning the LED against the thermal stress that would result from operating at higher currents to maintain luminance
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 structure enhances light collection efficiency, improves luminous efficiency, and extends the lifespan of the display device without increasing current, particularly benefiting outdoor applications.
Implementation Method 1
a reflective layer disposed on a side surface of the light collecting structure... reflects the LED light in the periphery of the LED
Data Source
AI summary
A display device and a manufacturing method of a display device are provided. The display device includes a substrate including a pixel defined thereon; a light emitting diode disposed in the pixel; an insulating layer covering the light emitting diode; a light collecting structure on at least a part of the insulating layer; and a reflective layer disposed at a side surface of the light collecting structure. The side surface of the light collecting structure may have a reverse tapered shape.