Alternating Multilayer Display Wiring for Narrow-Bezel Signal Integrity
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Solution Overview
Problem
As display devices with increased display areas and reduced non-display areas lead to closer wiring distances, coupling between wirings occurs, degrading image quality due to increased parasitic capacitance and signal interference.
Innovation Solution
The implementation of a display device with first and second transistors of different semiconductor materials (polycrystalline silicon and oxide semiconductor) and wirings at different levels, alternately arranged, along with a capacitor and insulating layers, to reduce coupling between wirings by increasing the distance between adjacent wiring layers and using an organic material layer in the bending area for stress absorption and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display area is increased and non-display area is decreased, then the display resolution and area utilization are improved, but the distance between wirings becomes smaller causing coupling and signal interference
Solution Approach 1:
The patent introduces multiple wiring layers (first wiring layer, second wiring layer, third wiring layer) stacked in the vertical dimension. By routing signals through different layers at different heights, the patent reduces parasitic capacitance and coupling between adjacent wirings on the same layer, thereby solving the signal interference problem while maintaining high display area utilization.
Solution Approach 2:
The patent introduces a fourth wiring layer as an intermediary layer between the third wiring layer and the display elements. This intermediate layer acts as a buffer and signal distribution layer, reducing direct coupling between closely spaced wirings and minimizing signal interference while enabling efficient signal routing to the display area.
2Manufacturing precision
If the number of wirings is increased to provide higher resolution, then the display quality is improved, but the wiring density increases causing coupling and degraded image quality
Solution Approach 1:
The patent utilizes multiple stacked wiring layers to route increasing numbers of signal lines in three dimensions rather than confining all wirings to a single plane. This vertical stacking allows higher wiring density without increasing in-plane coupling, enabling high-resolution displays while maintaining signal integrity through reduced parasitic capacitance between layers.
Data Source
AI summary
Provided is a display device including: a substrate having a display area and a peripheral area outside the display area; a first transistor and a second transistor each located over the display area of the substrate and arranged at different levels on the substrate; and a plurality of wirings located over the peripheral area of the substrate, wherein the plurality of wirings include first wirings and second wirings, the first wirings and the second wirings being located at different levels on the substrate and are alternately arranged with each other.