Micro LED Connection Electrode Structure for Reflective Light Redirection
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Solution Overview
Problem
In micro LED displays, the conductive electrodes used to connect driving circuits with light emitting diodes shade and reduce light output efficiency, leading to a decrease in brightness and uniformity of the light field.
Innovation Solution
The use of a first connecting electrode that encapsulates the light emitting layer, ensuring its normal projection over the array substrate is within the electrode's projection, allowing the electrode to shade and reflect upper output light, thereby increasing the brightness of the lower output light and providing a uniform light field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive electrode is used to connect the driving circuit with the light emitting diode, then good electrical connection is achieved, but light output efficiency is reduced due to shading
Solution Approach 1:
The patent converts the harmful shading effect of the conductive electrode into a beneficial reflection mechanism. By designing the electrode with specific reflective properties and geometric configuration (extending beyond the light emitting layer projection), the electrode reflects upward-traveling light downward toward the display surface, transforming the previously harmful light blockage into a useful light redirection mechanism that enhances overall light output efficiency.
2Reliability
If the conductive electrode is made larger to improve connection reliability, then electrical connection is enhanced, but light output efficiency decreases due to increased shading area
Solution Approach 1:
The patent transforms the electrode's extended area, which would normally cause more shading, into a beneficial reflective surface. The electrode is designed to extend beyond the normal projection of the light emitting layer in specific directions, creating a reflective barrier that redirects light that would otherwise escape upward back toward the display surface, thereby converting the extended area's potential harm into a useful light management function.
Solution Approach 2:
The patent applies different functional properties to different regions of the electrode structure. The portion of the electrode underlying the light emitting layer maintains high electrical conductivity for connection, while the extended portions are configured with reflective properties to manage light direction. This local differentiation of function allows the same component to simultaneously achieve reliable electrical connection and effective light output management without compromise.
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 enhances the lower light output efficiency of the display panel and tiled displays by increasing the brightness of the lower output light by 30% compared to control groups, while ensuring a uniform light field.
Implementation Method 1
the first connecting electrode can shade an upper output light of the light emitting diode efficiently and reflects the upper output light, thereby increasing a brightness of the lower output light
Data Source
AI summary
The display panel includes an array substrate, a light emitting diode and a first connection electrode. The array substrate includes a driving circuit layer. The light emitting diode is disposed on the array substrate. The light emitting diode includes a first semiconductor layer, a second semiconductor layer and a light emitting layer. The light emitting layer is disposed between the first semiconductor layer and the second semiconductor layer. The first connection electrode is electrically connected to the driving circuit layer and the first semiconductor layer. The first connection electrode wraps the light emitting layer such that a normal projection of the light emitting layer over the array substrate is within a normal projection of the first connection electrode over the array substrate.