Micro LED Anode and Wiring Layout for Luminance Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inorganic electroluminescent displays using micro LEDs experience a decrease in luminance and deteriorating display characteristics due to increased temperature, which affects the luminous efficiency of the inorganic LEDs.
Innovation Solution
The display device incorporates a substrate with transistors having positive temperature characteristics, an anode electrode that protrudes from the inorganic light-emitting element, and coupling wiring that efficiently transmits heat generated by the LEDs to the substrate and transistors, thereby maintaining the drive current and preventing temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inorganic LEDs are used as display elements, then light use efficiency is improved and environmental resistance is enhanced, but luminous efficiency decreases with temperature rise causing luminance deterioration
Solution Approach 1:
The patent introduces a heat dissipation structure comprising a heat dissipation layer and a heat dissipation pattern as an intermediary between the inorganic LED and the substrate. This mediator transfers heat away from the LED, preventing temperature rise that would otherwise cause luminance deterioration, thus resolving the contradiction between maintaining high light use efficiency and ensuring luminance stability.
Solution Approach 2:
The patent modifies the thermal parameters of the display device by introducing materials with specific thermal conductivity characteristics in the heat dissipation path. By changing the thermal parameters (conductivity, capacity) of certain layers, the system maintains stable operating temperature despite the inherent temperature sensitivity of inorganic LEDs, thereby preserving luminance stability.
2Power
If heat is generated by inorganic LEDs, then light emission is achieved, but temperature rise occurs causing luminance decrease
Solution Approach 1:
The patent converts the harmful heat generated by LED operation into a beneficial thermal gradient that drives heat flow toward the heat dissipation structure. By designing the heat dissipation pattern with appropriate thermal conductivity and geometry, the naturally generated heat is redirected away from the LED active region, transforming the harmful thermal effect into a useful heat transfer mechanism that maintains low operating temperature.
Solution Approach 2:
The heat dissipation layer acts as a thermal intermediary that decouples the light emission process from temperature accumulation. It provides a dedicated thermal conduction path that separates the optical function (light emission) from the thermal management function, allowing high power operation without proportional temperature rise.
3Area of stationary object
If display elements are arranged densely to improve resolution, then area utilization is improved, but heat dissipation becomes more difficult causing temperature rise
Solution Approach 1:
The patent segments the heat dissipation function into multiple independent heat dissipation patterns distributed across the substrate. Each pattern serves a local LED, creating modular thermal management zones. This segmentation allows efficient heat dissipation even when LEDs are densely packed, as each heat dissipation unit operates independently to manage local thermal load.
Solution Approach 2:
The patent extends heat dissipation from a two-dimensional plane to a three-dimensional structure by introducing vertically stacked heat dissipation layers and patterns at different heights and depths. This dimensional extension provides additional thermal conduction paths and increases the effective heat dissipation surface area, enabling effective thermal management in high-density displays.
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 maintains the luminance and prevents deterioration of display characteristics by effectively managing heat generated by the inorganic LEDs, ensuring stable operation even at elevated temperatures.
Implementation Method 1
coupling wiring that efficiently transmits heat generated by the LEDs to the substrate and transistors
Data Source
AI summary
A display device includes a substrate, a plurality of pixels arrayed on the substrate, an inorganic light-emitting element provided to each of the pixels, an anode electrode electrically coupled to the inorganic light-emitting element, a transistor provided on a first surface of the substrate, and coupling wiring that couples the anode electrode and the transistor. The anode electrode protrudes from an inside to an outside of the inorganic light-emitting element in planar view from a normal direction of the substrate.