Foldable Display Pad Layout to Prevent Conductive Ball Shorting
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Solution Overview
Problem
Clumping of conductive balls between pad electrodes in display apparatuses leads to short-circuit defects and potential defects, which are not effectively addressed in existing technologies.
Innovation Solution
The display apparatus is designed with a specific layout of connection lines and pad electrodes, minimizing overlapping areas and using non-overlapping connection lines to prevent clumping of conductive balls, thereby reducing defects and improving flatness and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If connection lines are arranged in a conventional overlapping manner to reduce the number of layers, then device complexity is reduced, but conductive balls clump in overlapping areas causing short-circuit defects and reliability deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional overlapping layout to a three-dimensional non-overlapping arrangement where connection lines are distributed across different spatial zones. Each connection line is positioned to avoid overlapping with others, eliminating the formation of conductive ball clumps in overlapping areas and preventing short-circuit defects.
2Reliability
If connection lines are arranged to avoid overlapping, then conductive ball clumping is prevented improving reliability, but the connection line structure becomes more complex
Solution Approach 1:
The patent segments the connection line layout into distinct non-overlapping zones, where each connection line occupies its own spatial region. This segmentation prevents conductive balls from accumulating in overlapping areas, thereby eliminating short-circuit defects while maintaining a structured and organized connection line arrangement.
3Ease of manufacture
If conventional connection line layouts are used, then manufacturing is simpler, but burnt defects occur due to conductive ball clumping increasing power consumption
Solution Approach 1:
The patent employs a non-overlapping spatial arrangement of connection lines that prevents conductive ball clumping. This eliminates burnt defects caused by excessive current concentration, thereby reducing power consumption while maintaining ease of manufacture through a systematic layout approach.
4Device complexity
If overlapping connection lines are used, then the structure is simpler, but flatness of the pad electrode area deteriorates due to conductive ball accumulation
Solution Approach 1:
The patent distributes connection lines in a non-overlapping configuration across different spatial regions, preventing conductive balls from accumulating in specific areas. This maintains the flatness of the pad electrode surface while keeping the connection line structure organized and manageable.
Data Source
AI summary
A display apparatus includes a substrate which has an active area, a first non-active area, a bending area, and a second non-active area; and a plurality of connection lines which are at least partially disposed in the second non-active area and include a first connection line; a second connection line which is disposed on the first connection line and has one end and the other end respectively disposed at the outside more than one end and the other end of the first connection line; a third connection line which is disposed on the second connection line and has one end disposed at the outside more than the other end of the first connection line; and a fourth connection line which is disposed on the third connection line and has one end disposed at the outside more than the other end of the second connection line.