Flexible Display Conductive Unit with Rounded Terminals
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Solution Overview
Problem
Flexible display devices face challenges in maintaining stable electrical connections between pad terminals and driving terminals, particularly in non-planar shapes and when subjected to mechanical stress, leading to potential disconnection and reliability issues.
Innovation Solution
A flexible display device design featuring a conductive unit with anisotropic conductive film and rounded driving terminals, along with barriers formed from insulating materials, ensures reliable electrical connections between pad terminals and driving terminals, even when the device is folded or rolled, by scattering stress and preventing disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is made flexible to enable non-planar shapes and portability, then adaptability and ease of operation are improved, but the reliability of electrical connections between pad terminals and driving terminals deteriorates due to mechanical stress and potential disconnection
Solution Approach 1:
The driving terminals are designed with rounded edges instead of sharp corners. This curvature distributes mechanical stress more evenly during bending and folding operations, preventing stress concentration at sharp edges that would lead to connection failure. The rounded geometry maintains electrical connection integrity while allowing the display to achieve flexible non-planar shapes.
Solution Approach 2:
A conductive unit with anisotropic conductive film is pre-installed between the pad terminals and driving terminals to provide stress distribution and protection. This conductive unit acts as a cushioning layer that maintains electrical connection stability before mechanical stress occurs, preventing disconnection during flexible operations.
2Reliability
If conventional terminal designs are used without stress distribution features, then device complexity is reduced, but the reliability deteriorates due to stress concentration at terminal edges during bending and folding
Solution Approach 1:
The driving terminals incorporate rounded edges as a simple geometric modification. This curvature feature is easy to manufacture and adds minimal structural complexity while effectively distributing stress during bending and folding, significantly improving connection reliability without substantially increasing device complexity.
Solution Approach 2:
A conductive unit with anisotropic conductive film is introduced as an intermediary element between the pad terminals and driving terminals. This conductive unit serves as a mediator that distributes mechanical stress and maintains electrical connection stability, improving reliability while adding only a thin functional layer that does not substantially increase overall device complexity.
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
The solution enhances the reliability of electrical connections in flexible display devices, maintaining functionality across various shapes and reducing the risk of disconnection, thereby improving the durability and usability of flexible display devices.
Implementation Method 1
a conductive unit with anisotropic conductive film and rounded driving terminals, along with barriers formed from insulating materials, ensures reliable electrical connections between pad terminals and driving terminals
Data Source
AI summary
A flexible display device is disclosed. In one aspect, the display device includes a flexible display panel including a display substrate, wherein the display substrate includes an active area for pixel circuits, an inactive area adjacent to the active area and having a pad area including a plurality of pad terminals, and a thin film encapsulation layer covering the active area. The display device also includes a display driver electrically connected to the pad terminals and a plurality of driving terminals each having a rounding unit. A conductive unit is configured to electrically connect the pad terminals to the respective driving terminals.