Array Substrate Concave-Convex Contact for Narrow Bezel AMOLED
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Solution Overview
Problem
The narrow bezel design in flexible AMOLED panels results in reduced contact area between the cathode and connection lines, leading to increased contact resistance and nonuniform brightness, which affects display quality.
Innovation Solution
The array substrate incorporates a concave-convex curved surface contact between the connection and outgoing lines, with an insulating layer having a matching concave-convex structure, and the use of materials like magnesium-silver alloy for the outgoing lines and indium tin oxide for auxiliary connection lines, to increase the contact area and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bezel space is narrowed to achieve flexible display with narrow border, then the display area is increased, but the contact area between connection line and outgoing line is reduced
Solution Approach 1:
The patent transitions from planar contact to three-dimensional overlapping contact. The connection line is designed with a first surface and second surface that overlap with the outgoing line in the vertical dimension, creating a contact area that extends beyond the planar projection. This dimensional change allows sufficient contact area while maintaining narrow bezel width.
Solution Approach 2:
The connection line is positioned within the overlapping region of the outgoing line, creating a nested configuration where the connection line's first surface and second surface are both covered by the outgoing line. This nesting arrangement maximizes contact area within the limited lateral space of the narrow bezel.
2Reliability
If the contact area is increased to reduce contact resistance, then the display quality is improved, but the border space is widened
Solution Approach 1:
Instead of increasing contact area by widening the border horizontally, the patent utilizes the vertical dimension by creating overlapping surfaces. The connection line extends vertically with a first surface and second surface that overlap the outgoing line, achieving increased contact area without increasing the horizontal border space.
Solution Approach 2:
The patent employs curved surface geometry for the connection line and outgoing line interfaces. The concave-convex curved surface design increases the effective contact area through surface curvature, allowing reduced contact resistance without requiring additional border space.
3Reliability
If the contact area is increased through overlapping and connection, then the contact resistance is reduced, but the manufacturing precision requirements are increased
Solution Approach 1:
The patent uses concave-convex curved surface designs for the connection line and outgoing line. These curved surfaces provide tolerance compensation during manufacturing, as the curved geometry naturally accommodates minor alignment variations while maintaining effective contact area, thereby reducing the stringency of manufacturing precision requirements.
Solution Approach 2:
The patent modifies the geometric parameters of the connection line, specifically creating a structure with a first surface and second surface that overlap the outgoing line. By changing the contact interface from a simple line contact to a multi-surface overlapping contact, the patent increases contact area and reduces contact resistance while the curved surface parameters provide manufacturing tolerance.
Data Source
AI summary
The present disclosure provides an array substrate and a display device. The array substrate includes a display region and a non-display region located at a periphery of the display region. The display region includes a plurality of pixel structures, and an outgoing line of each of the pixel structures is overlapped with and connected to a connection line. The connection line receives a signal provided by a signal supply circuit. An area of a contact interface between at least part of the connection line and the outgoing line is larger than an area of an orthographic projection of the contact interface on a plane where the array substrate is located.