OLED Electro-Optical Device Wiring Resistance Reduction
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Solution Overview
Problem
Existing electro-optical devices using OLEDs face challenges in reducing the resistance of wiring lines for power source potential supply, leading to instability and deterioration in display quality due to voltage drops.
Innovation Solution
The electro-optical device incorporates a conductive wiring line that overlaps with the data-signal outputting circuit and is supplied with power source potential through mounting terminals, with power-supply wiring lines strategically positioned between data lines to reduce wiring line resistance, using a mesh-like configuration to minimize voltage drop and ensure uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wiring line configuration is used, then device complexity is reduced, but wiring line resistance increases causing voltage drops and display quality deterioration
Solution Approach 1:
The patent introduces a conductive wiring line that overlaps with the data-signal outputting circuit in the vertical dimension (through-layer connection), transforming a planar wiring arrangement into a three-dimensional structure. This dimensional change allows power supply paths to be established independently from data signal paths, reducing resistance without increasing planar complexity
Solution Approach 2:
The power supply network is segmented into multiple independent paths: a conductive wiring line for main power supply and multiple power-supply wiring lines branching to different regions. This segmentation distributes current flow across multiple parallel paths, reducing overall resistance and preventing voltage drops in specific display regions
2Reliability
If wiring line resistance is reduced by increasing conductor cross-section, then voltage drop is minimized, but manufacturing precision requirements increase
Solution Approach 1:
Instead of increasing the cross-sectional area of planar wiring lines, the patent utilizes the vertical dimension by creating overlapping conductive layers connected through conductors. This approach reduces resistance through increased effective conductive area in 3D space without requiring tighter planar alignment precision
Solution Approach 2:
The patent introduces intermediate connection structures (conductors penetrating through insulating layers) that bridge the conductive wiring line and power-supply wiring lines. These intermediaries provide reliable electrical connection while accommodating manufacturing tolerances in layer alignment
Data Source
AI summary
An electro-optical device is provided. The electro optical device includes: a light emitting element configured to emit light according to a current flowing between a pixel electrode and a common electrode; a plurality of power-supply wiring lines provided at a side of the pixel electrode and configured to be supplied with a power source potential; a plurality of data lines; a data-signal outputting circuit configured to output a data signal to a data line; a conductive wiring line provided to overlap with the data-signal outputting circuit in plan view and configured to be supplied with the power source potential through a plurality of mounting terminals, in which each of the plurality of power-supply wiring lines is provided between the plurality of data lines in plan view and electrically coupled to the conductive wiring line.