Reflective Wall Pixel Structure to Prevent Sub-Pixel Light Mixing
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Solution Overview
Problem
Existing display devices face issues with light mixing between adjacent sub-pixels, which affects image clarity and color accuracy.
Innovation Solution
The display device incorporates a reflective wall that defines a closed curve shape around each light emitting element, filling a groove through the passivation and common electrode layers, and is made of a material with low light transmittance and high reflectance to prevent light mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If no reflective wall is used, then the device structure is simpler, but light mixing between adjacent sub-pixels occurs reducing image clarity
Solution Approach 1:
The reflective wall divides the display structure into separate optical zones for adjacent sub-pixels. By introducing this partitioning element that extends vertically through multiple layers, light from each sub-pixel is confined to its designated area, preventing cross-contamination and improving image clarity while adding controlled structural complexity.
Solution Approach 2:
The reflective wall utilizes the vertical dimension by extending from the substrate through the common electrode layer upward. This vertical segmentation creates distinct optical paths in the depth direction, effectively separating light from adjacent sub-pixels and enhancing image quality without requiring horizontal expansion.
2Manufacturing precision
If a reflective wall is introduced, then light mixing is prevented improving image clarity, but the device structure becomes more complex
Solution Approach 1:
The reflective wall segments the optical path for each sub-pixel, ensuring that light of specific colors from adjacent pixels does not mix. This segmentation maintains color purity and accuracy by creating distinct optical channels, while the segmented structure is integrated into the existing layer stack.
Solution Approach 2:
The reflective wall serves multiple functions simultaneously: it acts as an optical reflector to prevent light mixing, provides structural support within the layered architecture, and defines the vertical boundaries of the light emitting regions. This multi-functionality reduces the need for additional separate components.
3Loss of energy
If the reflective wall extends through multiple layers, then light reflection is enhanced, but manufacturing complexity increases
Solution Approach 1:
The groove for the reflective wall is formed by combining multiple etching steps that penetrate through different layers (substrate, common electrode, and intermediate layers). By merging these processing steps into a unified groove formation process, the manufacturing complexity is managed while achieving the desired deep reflective structure for enhanced light reflection.
Solution Approach 2:
The groove structure acts as an intermediary form that guides the reflective wall material to the correct position and depth. By creating this preparatory groove through the layered structure, the subsequent filling process becomes more controlled and manufacturable, bridging the gap between the complex multi-layer structure and the final reflective wall formation.
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 reflective wall effectively reflects light to prevent mixing between adjacent sub-pixels, enhancing image clarity and color accuracy by minimizing interference.
Implementation Method 1
a reflective wall defining a closed curve shape of a reflective opening surrounding the light emitting element in a plan view, and the reflective wall fills a groove passing through the second passivation layer and the common electrode in a direction facing the pixel circuit layer
Data Source
AI summary
A display device includes a common electrode, a light emitting element between a pixel electrode and the common electrode, a reflective layer covering a side surface of the light emitting element, an element insulating layer disposed between the reflective layer and the light emitting element, a first passivation layer disposed between a pixel circuit layer and the common electrode, a second passivation layer disposed on the common electrode, and a reflective wall defining a closed curve shape of a reflective opening surrounding the light emitting element in a plan view, and the reflective wall fills a groove passing through the second passivation layer and the common electrode in a direction facing the pixel circuit layer.