Organic Light Emitting Display Double-Level Wiring Transmittance
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Solution Overview
Problem
Conventional transparent organic light emitting display devices have insufficient transmittance due to the large area of wirings, which reduces the desired transmissive region and affects their application in certain uses.
Innovation Solution
The organic light emitting display device is designed with a double level configuration of wirings in the peripheral region, allowing for a reduction in the area occupied by the wirings while increasing the transmissive region, thereby enhancing the transmittance. This is achieved by strategically placing first and second wirings at different levels over the substrate, ensuring they do not overlap and optimizing their configuration to minimize overlap with the sub-pixel and transmissive regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wirings are disposed in a single level configuration, then the device complexity is reduced, but the area occupied by wirings increases, reducing the transmissive region
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-level wiring configuration to a double-level wiring configuration. The first wirings are disposed at a first level and the second wirings are disposed at a second level different from the first level, allowing wirings to be stacked vertically rather than spread horizontally. This resolves the contradiction by reducing the horizontal area occupied by wirings (increasing transmissive region) while managing complexity through systematic multi-level arrangement.
Solution Approach 2:
The patent segments the wiring structure into multiple independent levels. The first wirings and second wirings are separated into different vertical levels with insulating layers between them, allowing each level to be optimized independently for its specific function (signal transmission vs. power supply). This segmentation enables compact spatial arrangement that increases transmissive region area while maintaining functional clarity.
2Reliability
If wirings are made wider to reduce resistance, then the electrical conductivity is improved, but the area occupied by wirings increases, reducing transmittance
Solution Approach 1:
The patent resolves this contradiction by moving the wiring solution from a two-dimensional plane to a three-dimensional multi-level structure. Instead of increasing wiring width in the horizontal plane (which would reduce transmittance), the patent stacks wirings vertically at different levels. This maintains adequate wiring width for electrical conductivity while reducing the horizontal footprint, thereby improving transmittance without sacrificing reliability.
3Ease of manufacture
If the transmissive region area is increased, then the transmittance is improved, but the area available for wiring disposal is reduced
Solution Approach 1:
The patent resolves this spatial contradiction by utilizing the vertical dimension to dispose wirings. The first wirings are disposed in the peripheral region at a first level, while the second wirings are disposed at a second level different from the first level. This vertical stacking approach minimizes the horizontal area occupied by wirings, thereby maximizing the transmissive region area and improving transmittance while still providing adequate space for all necessary wiring connections.
Data Source
AI summary
An organic light emitting display device includes a plurality of pixel regions on a substrate, each having a sub-pixel region, a transmissive region and a peripheral region, a plurality of sub-pixel circuits in the sub-pixel region that control the sub-pixel region, a planarization layer that covers the sub-pixel circuits, a first electrode disposed on the planarization layer in the sub-pixel region, a second electrode disposed on the first electrode, and a plurality of wirings disposed at different levels over the substrate in the peripheral region. The wirings are arranged in at least double level configuration and include first wirings that extend in a first direction over the substrate, and second wirings that extend over the substrate in a second direction substantially perpendicular to the first direction.