Display Electrode Layout With Recessed Contact for Lower Resistance
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Solution Overview
Problem
Display devices with self-luminous elements, such as OLEDs, face challenges in reducing the number of conductive layers and preventing increased resistance when these layers are in contact with each other, which affects their performance and efficiency.
Innovation Solution
The proposed solution involves a display device design with a semiconductor layer configuration that includes specific gate insulating layers and connecting electrodes with protrusions and recesses, allowing for reduced conductive layers and optimized contact points to minimize resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive layers are used in the display device, then the electrical connection and signal transmission are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges multiple conductive layers into a single integrated conductive structure. The conductive layer is designed to simultaneously form gate electrodes, source/drain electrodes, and connecting electrodes, reducing the total number of separate conductive layers while maintaining all necessary electrical connections for device operation
Solution Approach 2:
The conductive layer is designed with multi-functionality to serve multiple purposes: it forms gate electrodes for transistor control, source/drain electrodes for current flow, and connecting electrodes for inter-layer electrical connections. This universal design eliminates the need for separate dedicated conductive layers for each function
2Reliability
If conductive layers are in contact with each other, then the electrical connection is established, but the resistance increases at contact points
Solution Approach 1:
The patent transitions from point-contact connections to area-contact connections by designing overlapping regions where conductive layers contact each other over extended surfaces. The connecting electrodes are positioned to overlap with semiconductor regions in planar view, creating large contact areas that significantly reduce contact resistance compared to traditional point contacts
Solution Approach 2:
The semiconductor region serves as an intermediary conductive path between different electrode structures. By positioning connecting electrodes to directly contact semiconductor regions rather than requiring contact between separate metal layers, the patent creates a low-resistance electrical pathway that reduces energy loss at connection points
Data Source
AI summary
A display device includes a first base part, a semiconductor layer including a first semiconductor part disposed on the first base part and a second semiconductor part adjacent to a first side of the first semiconductor part in a first direction, a gate insulating layer disposed on the semiconductor layer and including a first gate insulating layer and a second gate insulating layer spaced apart from each other, and a gate conductive layer including a gate electrode disposed on the first gate insulating layer and overlapping the first semiconductor part and a first connecting electrode overlapping the second gate insulating layer and the second semiconductor part. The first connecting electrode includes a protrusion, the second gate insulating layer includes a recess, and the protrusion of the first connecting electrode overlaps the recess of the second gate insulating layer.