Display Device Electrode Pattern for Voltage Uniformity
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Solution Overview
Problem
High-resolution display devices with numerous pixels face challenges in maintaining uniformity of the driving voltage applied to each pixel, leading to potential variations in light intensity due to voltage drops across the common electrode.
Innovation Solution
The display device incorporates a specific electrode pattern and voltage wiring configuration, including expanded portions and protruding features, to ensure uniform electric potential across the common electrode, with the common electrode contacting only certain exposed portions of the electrode pattern, and the voltage wiring connected through strategically positioned contact holes to maintain uniform voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to achieve high-resolution display, then the display resolution is improved, but the uniformity of driving voltage applied to each pixel deteriorates due to voltage drops across the common electrode
Solution Approach 1:
The common electrode is divided into multiple segmented electrode patterns (first electrode pattern, second electrode pattern, third electrode pattern) arranged in different directions. Each segment is independently connected to the voltage wiring through separate contact holes, distributing the voltage application points across the display area. This segmentation reduces the distance for voltage transmission and minimizes voltage drops, maintaining uniform driving voltage even as pixel count increases for high-resolution displays.
Solution Approach 2:
The electrode patterns extend in multiple directions (first direction, second direction, third direction) rather than a single direction, creating a three-dimensional voltage distribution network. This multi-directional arrangement ensures that voltage is applied uniformly across the entire common electrode area, compensating for the increased voltage drops that occur with higher pixel densities in high-resolution displays.
2Reliability
If the contact hole size is reduced to minimize interference between electrode patterns, then the voltage uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The electrode patterns are designed with expanded portions that create overlapping regions, ensuring that adjacent electrode segments maintain the same electric potential. The expanded portions of the first, second, and third electrode patterns are positioned to overlap with each other, establishing equipotential zones that reduce the need for extremely precise contact hole positioning while maintaining voltage uniformity across the common electrode.
Data Source
AI summary
A display device including a substrate including a display area and an opening area therein, a data conductive layer on the substrate and including a source electrode and a voltage wiring in the opening area, a protective layer on the data conductive layer and covering the source electrode and the voltage wiring, a pixel electrode layer including a pixel electrode connected to the source electrode through a first contact hole, and an electrode pattern connected to the voltage wiring through a second contact hole, a pixel defining layer including an opening exposing the pixel electrode and a hole exposing the electrode pattern, a light emitting layer on the pixel defining layer and a common electrode on the light emitting layer, wherein the hole does not overlap the first and second contact holes.