Display Substrate Line Stacking for Lower Signal Attenuation
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Solution Overview
Problem
Current flexible display panels face challenges in reducing impedance and capacitance between adjacent metal lines, which affects display performance due to signal attenuation in the first and last rows of the panel.
Innovation Solution
A display substrate design that includes a first voltage line, an alternating current signal line, and a second voltage line arranged in the non-display region, with specific layering and overlapping configurations to reduce signal interference and improve display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal lines are arranged in a limited space to increase resolution and refresh rate, then display performance is improved, but impedance and capacitance between adjacent lines increase causing signal attenuation
Solution Approach 1:
The patent transitions from planar 2D line arrangement to 3D stacked configuration by placing voltage lines and signal lines in different conductive layers. The first voltage line is on the first conductive layer, the alternating current signal line is on the first conductive layer, and the second voltage line is on the second conductive layer, utilizing vertical stacking to reduce horizontal interference while maintaining high resolution and refresh rate performance
Solution Approach 2:
The patent introduces an insulation layer as an intermediary between the first conductive layer (containing first voltage line and alternating current signal line) and the second conductive layer (containing second voltage line). This insulation layer acts as a mediator that electrically isolates adjacent lines while allowing controlled overlapping, thereby reducing capacitance and impedance between lines without compromising signal integrity
2Reliability
If the overlapping area between voltage lines and signal lines is increased to reduce resistance, then electrical conductivity is improved, but interference between lines increases
Solution Approach 1:
The patent applies different properties to different regions of the overlapping structure. The insulation layer has different dielectric properties in regions where voltage lines overlap with signal lines versus regions where they do not overlap. By controlling the overlap ratio and using protrusions/recesses at specific locations, the patent optimizes local electrical characteristics to achieve low resistance while minimizing interference
Solution Approach 2:
The patent controls the overlap ratio parameter (area of overlapping region to area of orthogonal projection of alternating current signal line) within a specific range. It also adjusts the dimensions and positions of protrusions and recesses to optimize the balance between electrical conductivity and interference reduction, changing geometric parameters to achieve optimal performance
Data Source
AI summary
A display substrate includes a first voltage line, an alternating current signal line and a second voltage line arranged on a substrate, the substrate includes a display region and a non-display region; the display substrate further includes a first conductive layer, a first insulation layer and a second conductive layer laminated one on another on the substrate, the first voltage line and the alternating current signal line are arranged on the first conductive layer, and the second voltage line is arranged on the second conductive layer; the first voltage line is lapped onto the second voltage line through a first groove penetrating through the first insulation layer; and an orthogonal projection of the second voltage line onto the substrate overlaps an orthogonal projection of the alternating current signal line onto the substrate at an overlapping region.