OLED Display Partition Structure for NFC Eddy Current Control
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Solution Overview
Problem
Display devices using organic light emitting diodes (OLEDs) face issues with eddy currents generated by near field communication antennas due to low resistance in common electrodes, leading to communication interference, and require translucency without compromising display quality.
Innovation Solution
A partition structure with conductive lower and upper portions surrounding subpixels, divided into segments by slits and protrusions, which reduces eddy currents and enhances translucency by allowing light transmission while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode is formed with low resistance material to ensure good electrical conductivity, then electrical connectivity is improved, but eddy current is enhanced causing communication interference
Solution Approach 1:
The common electrode is divided into multiple segments by introducing slits that extend from one end to the other end of the display area. This segmentation increases the resistance of the common electrode, thereby suppressing eddy current while maintaining sufficient electrical connectivity for driving the display elements.
2Reliability
If metal lines are used to provide electrical connectivity, then electrical conductivity is improved, but translucency is decreased due to light shielding
Solution Approach 1:
The patent extracts the light-shielding metal lines from the display area and relocates them to the non-display area. This allows the display area to maintain high translucency while the metal lines in the non-display area provide the necessary electrical connectivity for the display elements.
3Stability of the object's composition
If the common electrode is made continuous to ensure uniform voltage distribution, then electrical uniformity is improved, but eddy current increases causing communication interruption
Solution Approach 1:
The common electrode is segmented into multiple independent regions by slits extending across the display area. This segmentation suppresses eddy current formation while the segments are connected through metal lines in the non-display area, maintaining sufficient voltage uniformity across the display elements.
Solution Approach 2:
Different regions of the common electrode are given different properties: the display area contains slits to suppress eddy current, while the non-display area contains continuous metal lines for electrical connectivity. This local differentiation resolves the contradiction between voltage uniformity and eddy current suppression.
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
Prevents communication interference and improves display quality by minimizing eddy currents and ensuring adequate light transmission, while maintaining effective sealing and electrical connectivity.
Implementation Method 1
eddy current could occur in a common electrode because of a magnetic field generated by the antenna
Implementation Method 2
translucency is required in some display devices
Data Source
AI summary
According to one embodiment, a display device includes a plurality of subpixels arranged in a first direction and a second direction intersecting with the first direction, and a partition which includes a conductive lower portion and an upper portion protruding from a side surface of the lower portion and surrounds the subpixels. The partition includes first and second partitions arranged across an intervening gap in the first direction and extending in the second direction, and a plurality of protrusions extending from the first partition toward the second partition and spaced apart from the second partition.