Flexible Display Voltage Routing Across a Bending Area
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Solution Overview
Problem
Existing display devices face limitations in design freedom and display characteristics, particularly in the integration of flexible and bendable display areas, which affect the performance and reliability of light-emitting diode displays.
Innovation Solution
The display device incorporates a substrate with a bending area, a conductive overlap layer, and a structured contact hole design that allows for the connection of driving voltage transmission lines across the bending area, enhancing the flexibility and reliability of the display by maintaining electrical continuity and reducing leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible and bendable, then design freedom is improved, but electrical connection reliability deteriorates
Solution Approach 1:
The contact hole is divided into multiple segments (first contact hole and second contact hole) that are separated by an insulating layer. This segmentation allows the conductive overlap layer to maintain electrical connection across the bending area while accommodating the flexible structure, resolving the contradiction between design freedom and connection reliability.
Solution Approach 2:
The conductive overlap layer acts as an intermediary element that bridges the driving voltage transmission line and the transistor gate electrode across the bending area. This intermediary structure ensures reliable electrical connection while allowing the substrate to be flexible and bendable, thus maintaining both design freedom and reliability.
2Reliability
If the overlap layer is added to improve transistor control, then display characteristics are improved, but device complexity increases
Solution Approach 1:
The conductive overlap layer is merged with the existing transistor structure and integrated into the pixel circuit design. By combining the overlap layer functionality with the existing gate electrode and driving voltage transmission line structures, the patent improves display characteristics without significantly increasing device complexity.
Solution Approach 2:
The conductive overlap layer serves multiple functions: it acts as a gate electrode control element, provides electrical connection across the bending area, and improves transistor switching characteristics. This multi-functionality reduces the need for separate components, thereby improving display characteristics without proportionally increasing device complexity.
3Reliability
If contact holes are formed in the bending area, then electrical connection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The contact hole structure is segmented into multiple smaller contact holes (first and second contact holes) rather than forming a single large contact hole. This segmentation reduces the precision requirements for each individual contact hole while maintaining overall electrical connection reliability in the bending area.
Solution Approach 2:
The conductive overlap layer serves as an intermediary that facilitates electrical connection through the bending area. By using this intermediary structure, the patent can form contact holes with relaxed precision requirements while still achieving reliable electrical connection, as the overlap layer bridges any gaps or misalignments.
Data Source
AI summary
A display device includes a substrate including a display area including a plurality of pixels, a peripheral area around the display area, and a bending area disposed in the peripheral area. A plurality of transistors is disposed in each pixel; a driving voltage line is disposed in the display area and transmits a driving voltage; a driving voltage transmission line is disposed in the peripheral area and is connected to the driving voltage line; and a conductive overlap layer overlaps at least one of the plurality of transistors.