Flexible Display Double-Layer Electrode Mask Reduction
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Solution Overview
Problem
Conventional flexible display panels face challenges in reducing bezel width, leading to compromised electrical performance and increased production costs due to the use of multiple masks for double-layered source/drain electrode metal layers made of the same material, which hinders mass production.
Innovation Solution
A flexible display panel with a double-layered source/drain electrode structure where the second source/drain electrode metal layer is connected to the first through a through hole, reducing the need for additional masks and materials, and utilizing a passivation layer to planarize the electrode metal layer, thereby saving costs and improving uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layered source/drain electrode metal layer structure is used to reduce voltage drop, then electrical performance is improved, but more masks are needed which increases production costs and time
Solution Approach 1:
The patent combines the source electrode and drain electrode into a single double-layered source/drain electrode metal layer structure. The first source/drain electrode metal layer and the second source/drain electrode metal layer are integrated to form a unified conductive path, eliminating the need for separate source and drain electrode formation processes and reducing the number of masks required while maintaining electrical performance
Solution Approach 2:
The patent transitions from a single-layer source/drain electrode structure to a double-layered structure by adding a vertical dimension. The first source/drain electrode metal layer is positioned at a lower level and the second source/drain electrode metal layer is positioned at a higher level, creating a three-dimensional conductive path that reduces voltage drop without requiring additional lateral space or masks
2Area of stationary object
If the bezel width is reduced to increase screen ratio, then display area is improved, but the width of voltage signal lines is reduced compromising electrical performance
Solution Approach 1:
The patent utilizes the vertical dimension by creating a double-layered source/drain electrode metal layer structure. The first source/drain electrode metal layer and the second source/drain electrode metal layer are stacked vertically to increase the effective cross-sectional area of the voltage signal lines without increasing their horizontal width, thereby maintaining electrical performance while allowing for reduced bezel width
Solution Approach 2:
The patent employs a composite structure consisting of two different metal layers with distinct properties. The first source/drain electrode metal layer and the second source/drain electrode metal layer are made of different materials optimized for their respective functions, creating a composite conductive path that achieves superior electrical performance in a compact configuration
Data Source
AI summary
A flexible display panel includes a flexible substrate, a blocking layer, a buffering layer, an active layer, a first gate electrode insulating layer, a gate electrode metal layer, a second gate electrode insulating layer, a first source/drain electrode metal layer, an interlayer insulating layer, a first passivation layer, a second source/drain electrode metal layer, a second passivation layer, an anode metal layer, a pixel isolation layer, and a pixel support layer. The second source/drain electrode metal layer is connected to the active layer and the first source/drain electrode metal layer via two through holes.