Wearable Display Module Electrode Grating for Uniform Sub-Pixels
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Solution Overview
Problem
Wearable electronic devices face challenges in maintaining display uniformity and efficiency due to uneven current distribution across sub-pixels, leading to suboptimal display performance.
Innovation Solution
Incorporating a common electrode with a metal layer disposed inside barrier ribs, forming a grating shape within the display module, which stabilizes current application to each sub-pixel and eliminates the need for separate processes to form barrier ribs, thereby enhancing manufacturing precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a common electrode with a metal layer is disposed inside barrier ribs forming a grating shape, then current distribution uniformity is improved, but device structure complexity increases
Solution Approach 1:
The common electrode integrates both the electrical connection function and the current distribution regulation function into a single structure. The metal layer disposed inside the barrier ribs serves dual purposes: providing electrical connectivity across sub-pixels while simultaneously acting as a current distribution equalizer through its grating shape configuration, thereby reducing the need for separate current regulation structures.
Solution Approach 2:
The metal layer within the common electrode is configured with a grating shape that has varying local properties. The pattern density and metal distribution are locally adjusted to compensate for non-uniform current flow characteristics in different regions of the display, ensuring uniform current distribution across all sub-pixels despite variations in device geometry.
2Manufacturing precision
If barrier ribs are formed through separate processes, then sub-pixel partitioning is achieved, but manufacturing efficiency decreases
Solution Approach 1:
The barrier rib formation process is merged with the common electrode fabrication process. The same photolithography and etching steps that define the common electrode pattern also create the barrier ribs, eliminating the need for separate barrier rib formation processes and reducing total manufacturing steps while maintaining precise sub-pixel partitioning.
Solution Approach 2:
The common electrode structure serves multiple functions simultaneously: it provides electrical connection, defines sub-pixel boundaries through integrated barrier ribs, and regulates current distribution. This multi-functionality reduces the number of specialized components and processes needed, thereby improving manufacturing efficiency without sacrificing precision.
3Reliability
If the common electrode connects light-emitting device units, then electrical connectivity is improved, but color interference between sub-pixels may increase
Solution Approach 1:
The common electrode is segmented into distinct regions by the barrier ribs, creating electrically isolated zones above each sub-pixel. The metal layer is discontinuous and patterned to provide connectivity only where needed for electrical function, while the barrier ribs physically separate the electrode regions to prevent lateral current spread that could cause color interference between adjacent sub-pixels.
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 ensures uniform current distribution across sub-pixels, improving display uniformity and manufacturing efficiency by reducing the number of processing steps and preventing color interference between sub-pixels.
Implementation Method 1
a color conversion layer disposed on an upper portion of the plurality of light-emitting device units and configured to emit excitation light via light emitted from the plurality of light-emitting device units
Data Source
AI summary
Disclosed are a display module and a wearable electronic device comprising same. The disclosed display module may comprise: a substrate; a plurality of light-emitting device units comprising at least one layer arranged on the substrate; barrier ribs extending from the plurality of light-emitting device units and partitioning sub-pixel regions; a color conversion layer disposed on the plurality of light-emitting device units and configured to emit excitation light using light emitted from the plurality of light-emitting device units; a common electrode including a metal layer disposed, as a portion of the plurality of light-emitting device units, on upper portions of the plurality of light-emitting device units connecting the respective light-emitting device units and inside the barrier ribs to be in contact with the upper portions of the plurality of light-emitting device units; and a plurality of individual electrodes respectively disposed on opposite surfaces of light-emitting surfaces of the plurality of light-emitting device units.