Reflective Capping Layout for Higher-Output Display Pixels
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Solution Overview
Problem
Existing display devices face challenges in achieving high light output efficiency, particularly in high-temperature environments, with inorganic light emitting diodes exhibiting superior blue light emission efficiency compared to organic counterparts.
Innovation Solution
A display device design featuring a light emitting element with capping portions and a reflective layer that do not overlap the thin film transistor, along with a color conversion element layer, enhancing light reflection and output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional light emitting element structure is used, then the device structure is simple, but the light output efficiency is insufficient
Solution Approach 1:
The light emitting element is divided into multiple functional segments: a light emitting layer, a first capping layer, a second capping layer, and a reflective layer. Each segment performs a specific function in light generation, direction control, and reflection, collectively improving light output efficiency while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces vertical layering (thickness direction) to control light emission. By stacking multiple layers with different optical properties in the thickness direction, the device achieves improved light output efficiency without increasing planar area, effectively utilizing the third dimension to resolve the contradiction
2Use of energy by moving object
If inorganic light emitting diodes are used, then blue light emission efficiency is higher, but durability in high temperature environments is reduced
Solution Approach 1:
The light emitting element employs a composite structure combining inorganic light emitting diodes with multiple protective and functional layers including capping layers and reflective layers. This composite approach maintains the high blue light emission efficiency of inorganic materials while the layered structure provides thermal management and environmental protection to improve high temperature durability
3Productivity
If capping portions and reflective layer overlap the thin film transistor, then manufacturing is simpler, but light output efficiency is reduced
Solution Approach 1:
The patent implements local spatial separation where the capping portions and reflective layer are positioned to overlap specific regions while avoiding the thin film transistor area. This local quality differentiation allows light to be efficiently reflected and directed in the display region without interfering with the electrical function of the transistor, achieving both high light output efficiency and manufacturing feasibility
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 design improves light output efficiency by reflecting and converting light effectively, addressing the inefficiencies in existing technologies.
Implementation Method 1
a reflective layer covering the first capping portion and the second capping portion
Implementation Method 2
a light emitting element on the via insulating layer and having first and second ends with different polarities from each other
Data Source
AI summary
A display device includes: a first substrate; a thin film transistor on the first substrate; a via insulation layer on the thin film transistor; a light emitting element on the via insulating layer and having first and second ends with different polarities from each other; a first capping portion on the first end of the light emitting element and forming a first closed space; a second capping portion spaced apart from the first capping portion, on the second end of the light emitting element, and forming a second closed space; and a reflective layer covering the first capping portion and the second capping portion. The light emitting element, the first capping portion, and the second capping portion do not overlap the thin film transistor in a thickness direction.