Overlapping Transistor Pixel Layout for High-Resolution Displays
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Solution Overview
Problem
Current display devices face challenges in achieving high resolution and reliable light emission efficiency due to limitations in element reliability and light emission efficiency.
Innovation Solution
A display device design featuring a substrate with a transparent electrode, a reflective electrode, and a light emitting element where the transistor overlaps the light emitting element, with a reflective electrode covering the light emitting element to enhance light emission efficiency and a planarization layer surrounding the light emitting element to improve element reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transistor is disposed adjacent to the light emitting element, then the device structure is simpler, but the resolution is reduced and area is increased
Solution Approach 1:
The transistor is moved from a planar adjacent arrangement to a vertical stacked arrangement above the light emitting element. This dimensional transition allows the pixel components to be arranged in the thickness direction rather than the plane direction, achieving high resolution without increasing pixel area.
Solution Approach 2:
The transistor is positioned to overlap and nest above the light emitting element, with the reflective electrode extending to cover both components. This nested arrangement consolidates multiple pixel components into a vertical stack, maximizing space utilization and maintaining small pixel area while achieving high resolution.
2Use of energy by moving object
If a reflective electrode is formed on the light emitting element, then light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The reflective electrode serves multiple functions simultaneously: it reflects light to improve emission efficiency, provides electrical connection to the transistor, and acts as a common electrode for both the light emitting element and transistor. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity while improving light emission efficiency.
Solution Approach 2:
The reflective electrode is designed to extend and cover both the light emitting element and the transistor, merging these components under a single electrode structure. This consolidation simplifies the overall electrode architecture while maintaining the light reflection function necessary for high emission efficiency.
3Manufacturing precision
If the transistor overlaps the light emitting element, then the pixel area is reduced for high resolution, but element reliability may be compromised
Solution Approach 1:
The transistor is arranged in the vertical dimension above the light emitting element rather than in the same plane, allowing overlapping without planar interference. This vertical stacking achieves high resolution through compact pixel area while maintaining element reliability by separating the functional regions in the thickness direction.
Solution Approach 2:
The transistor and light emitting element are nested in a vertical stack with the reflective electrode covering both components. This nested configuration allows the transistor to be positioned above the light emitting element without compromising either component's integrity, as they occupy different vertical spaces while sharing the same horizontal footprint.
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 solution improves element reliability and light emission efficiency, enabling the creation of high resolution display devices by directly bonding the light emitting element onto a first electrode and forming a reflective electrode on the light emitting element, which enhances light emission and reduces material selection limitations.
Implementation Method 1
a second electrode, which is a reflective electrode, on the light emitting element, and light emission efficiency may be improved
Data Source
AI summary
A display device includes: a substrate; a transparent electrode on one surface of the substrate; a reflective electrode on the transparent electrode; a transistor on the reflective electrode; and a light emitting element between the transparent electrode and the reflective electrode. The transistor overlaps the light emitting element.