Display Device Extension Wire Layer Routing
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Solution Overview
Problem
The challenge in display devices is to reduce the size of the peripheral area while maintaining high resolution and speed, as the area occupied by drivers increases, limiting the expansion of the display area.
Innovation Solution
The display device incorporates a substrate with a first and second display area, where the second pixel circuit portion and emitting diode are connected through an extension wire in a different layer, allowing the driving circuit to overlap the emitting diode, thus simplifying wiring and preventing short circuits, and includes a bridge electrode to connect the extension wire and connection electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the driver area is increased to support high resolution and high speed operation, then the display quality is improved, but the display area is reduced
Solution Approach 1:
The extension wire is routed through a different layer (third conductor layer) rather than staying in the same plane as the pixel electrode, utilizing the vertical dimension to achieve longer wiring paths without increasing the planar display area footprint
Solution Approach 2:
The wiring path is divided into multiple segments across different layers: connection electrode in the second conductor layer, extension wire in the third conductor layer, and pixel electrode in the fourth conductor layer, allowing flexible routing to reach distant emitting diodes
2Device complexity
If the extension wire is disposed in the same layer as the pixel electrode, then the wiring is simpler, but short circuit risk increases
Solution Approach 1:
The extension wire is placed in the third conductor layer while the pixel electrode is in the fourth conductor layer, separating them vertically to prevent lateral short circuits while maintaining electrical connection through the layered structure
Solution Approach 2:
The extension wire acts as an intermediary conductor that bridges the connection electrode and pixel electrode through different layers, providing a controlled path that isolates signal lines from each other while maintaining functional connectivity
3Area of stationary object
If the display area is expanded by reducing peripheral area, then the display size is increased, but the driver area becomes more constrained
Solution Approach 1:
The driving circuit portion is positioned in the second display area (peripheral area) and connected to emitting diodes in the first display area through extension wires in the third conductor layer, utilizing vertical routing to reduce lateral driver area requirements
Solution Approach 2:
The extension wires are embedded within the layered conductor structure, nesting the wiring paths within the existing device architecture rather than adding external routing paths, thereby integrating the expanded display function into the existing driver layout
Data Source
AI summary
A display device includes: a substrate having a first display area and a second display area. A first pixel circuit portion is disposed on the substrate. A first emitting diode includes a first pixel electrode connected to the first pixel circuit portion. A second pixel circuit portion is disposed on a second display area of the substrate. An extension wire is connected to the second pixel circuit portion. A second emitting diode includes a second pixel electrode connected to the extension wire, and a driving circuit portion is connected to the first pixel circuit portion and the second pixel circuit portion, and overlaps the second emitting diode. The extension wire is disposed in a different layer from the second pixel electrode.