Display Device Driving Pad Spacing for Corrosion Prevention
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Solution Overview
Problem
Display devices face challenges in achieving reliable bonding between flexible films and display panels, particularly due to electrochemical corrosion and potential differences in signal potentials, which can lead to galvanic corrosion and electrical short circuits.
Innovation Solution
The display device incorporates a configuration where driving pads with varying potential differences are spaced apart by different intervals, and side electrodes are either directly bonded or connected through an anisotropic conductive film, with specific intervals to prevent electrochemical corrosion, using materials like copper and silver, and employing ultrasonic bonding for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving pads with different potential differences are spaced apart by different intervals, then bonding reliability is improved by preventing galvanic corrosion, but device complexity increases due to non-uniform spacing requirements
Solution Approach 1:
The patent applies local quality by differentiating the spacing intervals between driving pads based on their specific potential differences. Pads with larger potential differences (≥7V) are spaced at a first interval (≥140μm) to prevent galvanic corrosion, while pads with smaller potential differences are spaced at a second interval (<140μm). This localized differentiation optimizes reliability without unnecessarily increasing overall device complexity.
2Area of stationary object
If the flexible film is disposed on a side surface of the display panel, then display area is increased and bezel width is decreased, but bonding reliability deteriorates due to electrochemical corrosion and potential differences
Solution Approach 1:
The patent enables side-surface flexible film disposition by implementing local quality control through differentiated spacing intervals. This allows the flexible film to be positioned on the side surface (increasing display area) while specific driving pad pairs are spaced at appropriate intervals to prevent galvanic corrosion, thus maintaining bonding reliability despite the challenging configuration.
3Length of moving object
If driving pads are spaced closer together, then device size is reduced, but electrical short circuits may occur due to galvanic corrosion from potential differences
Solution Approach 1:
The patent resolves this contradiction by applying local quality principles: driving pads with small potential differences (<7V) can be spaced closely (<140μm) to minimize device size, while pads with large potential differences (≥7V) are spaced farther apart (≥140μm) to prevent galvanic corrosion and electrical short circuits. This selective spacing optimizes both compactness and reliability.
4Ease of manufacture
If uniform spacing is used between all driving pads, then manufacturing is simplified, but bonding reliability decreases due to galvanic corrosion from potential differences
Solution Approach 1:
The patent addresses this contradiction by implementing local quality through differentiated spacing intervals based on potential difference thresholds. While this requires non-uniform spacing configuration, the clear classification criteria (7V threshold, 140μm interval threshold) simplify the manufacturing process by providing explicit design rules, thereby balancing manufacturing ease with bonding reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances bonding reliability by minimizing galvanic corrosion and electrical short circuits, ensuring stable connections between the display panel and the gate circuit film, thereby increasing the display area and reducing the non-display area.
Implementation Method 1
a flexible film that includes a plurality of lead electrodes in contact with the plurality of side electrodes
Implementation Method 2
employing ultrasonic bonding for improved reliability
Data Source
AI summary
Disclosed is a display device comprising a display panel which includes a display area and a non-display area surrounding the display area, the display panel including a plurality of driving lines disposed on the non-display area, and a plurality of driving pads connected to the plurality of driving lines, a plurality of side electrodes disposed on a side surface of the display panel and in contact with side surfaces of the plurality of driving pads, and a flexible film that includes a plurality of lead electrodes in contact with the plurality of side electrodes. The plurality of driving pads includes first to third driving pads that are sequentially arranged in a first direction. A first interval between the first and second driving pads is different from a second interval between the second and third driving pads.