Light-Emitting Diode Light-Reflecting Resist Structure
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Solution Overview
Problem
The scaling-down of light emitting diodes (LEDs) for enhanced display resolution leads to increased difficulty in manufacturing and reduced control over lateral light guiding, resulting in light loss and mixing, particularly in confined areas.
Innovation Solution
A light emitting device is fabricated with a substrate and multiple LEDs, where a light-reflecting resist is disposed between and around the LEDs, directly contacting their side surfaces, to reflect and divert light, thereby reducing loss and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LED size is scaled down to enhance display resolution, then the display resolution is improved, but the manufacturing difficulty increases and control over lateral light guiding is reduced
Solution Approach 1:
A light-reflecting resist structure is introduced as an intermediary element between adjacent LEDs. This resist structure directly contacts the side surfaces of LEDs and includes light-reflecting portions that act as mediators to guide lateral light back into the LED, thereby maintaining control over light propagation even as LED size is reduced for higher resolution displays.
2Measurement precision
If the LED size is scaled down to enhance display resolution, then the display resolution is improved, but light loss and mixing increase due to reduced control over lateral light guiding
Solution Approach 1:
The light-reflecting resist structure converts the harmful effect of lateral light leakage (which causes light loss and mixing) into a beneficial effect by reflecting this escaped light back into the LED. The light-reflecting portions specifically designed in the resist structure capture laterally propagating light and redirect it, thereby reducing light loss and preventing color mixing between adjacent LEDs.
3Loss of energy
If a light-reflecting resist is disposed between and around the LEDs to reflect light back, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The light-reflecting resist structure serves multiple functions simultaneously: it acts as an insulating layer between adjacent LEDs, provides mechanical support, and functions as a light-reflecting structure through its specifically designed light-reflecting portions. By combining these multiple functions into a single structure, the patent improves light efficiency without proportionally increasing device complexity.
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-reflecting resist effectively increases light efficiency and reliability by reflecting light back into the LEDs, minimizing loss and mixing, and enhancing the light emission angle.
Implementation Method 1
a light-reflecting resist is disposed between and around the LEDs, directly contacting their side surfaces, to reflect and divert light
Data Source
AI summary
A light emitting device includes a substrate, multiple light emitting diodes disposed on the substrate and a light-reflecting resist. The light emitting diode has a first electrode and a second electrode, both of which are disposed on a first surface of the light emitting diode facing the substrate. The light-reflecting resist is disposed between the light emitting diodes and directly contacts a side surface of the light emitting diode. At least a portion of the light-reflecting resist is disposed between the first electrode and the second electrode.