OLED Electrode Link-Line Stacking for Narrow-Bezel Displays
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Solution Overview
Problem
There is a growing demand for OLED display devices with larger sizes, higher resolutions, and improved display quality, while also needing to reduce the planar areas of non-display regions and bezels to enhance image size and visual experience.
Innovation Solution
The OLED display device incorporates a substrate with a display area and non-display area, featuring a link line structure composed of sequentially stacked first, second, and third conductive lines, with the second electrode directly on the third conductive line in the non-display area, and a thin film encapsulation layer including inorganic and organic layers to prevent moisture infiltration, allowing for a flexible substrate that can be bent to reduce bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the planar area of non-display regions is reduced to increase image size, then the display quality and visual experience are improved, but the routing space for conductive lines becomes more limited and device complexity increases
Solution Approach 1:
The patent transitions from planar routing to three-dimensional stacked routing by forming first, second, and third conductive lines at different vertical levels. This allows conductive lines to be routed in the thickness direction of the substrate, effectively utilizing the Z-dimension to overcome the limited planar space in reduced-bezel designs.
Solution Approach 2:
The conductive line routing is segmented into multiple discrete layers (first conductive line layer, second conductive line layer, third conductive line layer) separated by organic layers. This segmentation allows independent routing paths at different levels, reducing interference and enabling complex routing patterns within limited space.
2Adaptability or versatility
If the substrate is made flexible to enable narrow bezel designs, then the adaptability and design flexibility are improved, but the reliability and moisture resistance may deteriorate
Solution Approach 1:
The patent employs composite encapsulation structures combining organic layers (first organic layer, second organic layer) with conductive line structures. The organic layers provide both mechanical flexibility and moisture barrier properties, while the stacked conductive lines maintain electrical functionality. This composite approach allows the substrate to be flexible while maintaining reliability.
Data Source
AI summary
An OLED display device including: a substrate including a display area and a non-display area; an organic light emitting element including a first electrode, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer; a first conductive line at the non-display area of the substrate; a first organic layer on the first conductive line; a second conductive line on the first organic layer and connected to the first conductive line; a second organic layer on the second conductive line; and a third conductive line on the second organic layer and connected to the second conductive line. The third conductive line is connected to the second electrode. The first electrode is at the display area of the substrate.