Micro LED Display Panel Reflective Layout for Light Extraction
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Solution Overview
Problem
Micro LED display panels face challenges in maximizing light-emitting efficiency while ensuring normal function, as light emitted by micro LEDs is not effectively focused towards the light-emitting side.
Innovation Solution
A display panel structure is designed with reflective layers and barrier layers to direct light emission efficiently, while maintaining electrical connections and transistor functionality by strategically positioning electrodes and reflective layers to avoid overlap and simplify manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If micro LED emits light uniformly in all directions, then the light emission is simple and uniform, but the light-emitting efficiency toward the light-emitting side is low
Solution Approach 1:
The reflective structure is divided into multiple segments: a first reflective layer at the bottom, barrier layers between adjacent light-emitting elements, and a second reflective layer at the top. Each segment serves a specific function in directing light toward the light-emitting side, collectively improving light-emitting efficiency without requiring a completely new structure.
Solution Approach 2:
The patent introduces vertical layering (bottom reflective layer, barrier layers, top reflective layer) to control light propagation. By arranging reflective structures in multiple vertical dimensions, light emitted in all directions is systematically redirected toward the light-emitting side, converting omnidirectional emission into directed emission.
2Loss of energy
If reflective layers are added to focus light, then light-emitting efficiency increases, but the device structure becomes more complex
Solution Approach 1:
The barrier layers serve dual functions: they electrically isolate adjacent light-emitting elements and simultaneously act as reflective structures to direct light toward the light-emitting side. The first and second reflective layers also serve multiple purposes in light management, reducing the need for additional dedicated components.
Solution Approach 2:
The patent merges the barrier layer function (electrical isolation) with the light reflection function by placing reflective materials on the barrier layers. This combination reduces the total number of separate components needed, as the barrier layers perform both electrical and optical functions simultaneously.
3Reliability
If electrodes are positioned to maintain normal function, then electrical connectivity is ensured, but light reflection effectiveness may be reduced
Solution Approach 1:
The reflective layers are strategically positioned in specific local areas: the first reflective layer is placed at the bottom where it won't interfere with electrode connections, while the second reflective layer is positioned on the barrier layers where it can reflect light without blocking electrical pathways. This localized placement ensures both electrical reliability and light reflection effectiveness.
Solution Approach 2:
The patent resolves the conflict by using vertical positioning in different dimensions: electrodes remain in their functional positions for electrical connection, while reflective layers are placed in vertical layers (bottom, middle barrier layers, top) that direct light without interfering with the horizontal electrical connectivity pathways.
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
Enhances light-emitting efficiency and maintains normal panel function by effectively reflecting light towards the emitting side, while simplifying the manufacturing process and reducing light loss.
Implementation Method 1
The first reflective layer is located on a side of the light-emitting element facing the base substrate, and with a direction perpendicular to the base substrate as a projection direction, the first reflective layer at least partially covers the light-emitting element
Implementation Method 2
the second reflective layer is located on a side of the barrier layer facing away from the base substrate, and at least part of the second reflective layer is located on a side wall of the barrier layer facing the light-emitting element
Data Source
AI summary
Provided are display panel and display device. Display panel includes base substrate; light-emitting element located on base substrate; first electrode and second electrode both electrically connected to light-emitting element, both located on side of light-emitting element facing base substrate or on side of light-emitting element facing away from base substrate and both providing voltage signals for light-emitting element; first reflective layer located on side of light-emitting element facing base substrate, and with direction perpendicular to base substrate as projection direction, first reflective layer covering light-emitting element; and voltage signal line located on side of light-emitting element facing base substrate. First electrode and second electrode respectively include first extension part and second extension part, at least one of which is connected to voltage signal line and does not overlap first reflective layer. First electrode and second electrode normally receive voltage signals, and light-emitting efficiency of display panel is improved.