Display Panel Grid Wiring for IR Drop Reduction
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Solution Overview
Problem
The IR Drop phenomenon in display panels causes non-uniform brightness and visually visible display mura, and adding an extra metal layer to form net-shaped voltage drain drain signal lines increases process difficulty.
Innovation Solution
The display panel incorporates grid-shaped voltage dividing wires on the same layer as the bottom gate of the thin film transistor, intersecting with voltage drain drain signal lines and connected through via holes, forming a net-shaped structure without additional process complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an extra metal layer is added to form net-shaped voltage drain drain signal lines, then IR Drop is reduced and brightness uniformity is improved, but process difficulty increases due to additional photomask manufacture procedure
Solution Approach 1:
The patent merges the voltage dividing wires with the bottom gate metal layer by arranging them on the same layer and connecting them through via holes at intersecting positions. This integration eliminates the need for an separate extra metal layer, thereby reducing process complexity while maintaining the net-shaped structure that reduces IR Drop and improves brightness uniformity.
Solution Approach 2:
The bottom gate metal layer is given multiple functions: it serves both as the gate electrode for the thin film transistor and as the voltage dividing wire structure. This multi-functionality reduces the number of separate metal layers needed, simplifying the manufacturing process while achieving the IR Drop reduction effect.
2Area of stationary object
If voltage drain drain signal line routing is narrowed to increase aperture ratio, then aperture ratio is improved, but IR Drop phenomenon occurs causing non-uniform brightness and display mura
Solution Approach 1:
The patent segments the voltage supply path by introducing voltage dividing wires that intersect with the voltage drain drain signal lines. This segmentation creates multiple parallel current paths, distributing the current flow and reducing the IR Drop in each individual line, thereby maintaining brightness uniformity even with narrowed routing for high aperture ratio.
Solution Approach 2:
The patent adds a dimensional solution by introducing via holes that connect different layers (bottom gate layer and voltage drain drain signal line layer). This vertical connection creates a three-dimensional net-shaped structure that provides additional current paths without increasing the planar routing width, thus maintaining aperture ratio while reducing IR Drop.
Data Source
AI summary
The present disclosure relates to a display panel and a display device. The display panel comprises a thin film transistor and a plurality of voltage drain drain signal lines, the thin film transistor comprises a bottom gate and a top gate opposite to each other, the voltage drain drain signal lines are arranged on the same layer as a source electrode and a drain electrode, the display panel further comprises a plurality of voltage dividing wires arranged on the same layer as the bottom gate, the plurality of voltage dividing wires and the plurality of voltage drain drain signal lines intersect with one another to be in grid-shaped distribution, and at least part of intersecting positions of the voltage dividing wires and the voltage drain drain signal lines are electrically connected through via holes.