Flexible Display Terminal Electrode Segmentation for Connection Reliability
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Solution Overview
Problem
The manufacturing yield of flexible organic electroluminescence (EL) display devices is compromised due to connection failures during the crimping of flexible printed circuit boards (FPCs) to terminal portions, which can result from foreign matter attachment, misalignment, non-uniform crimping pressure, and insufficient heating.
Innovation Solution
The display device incorporates a configuration where terminal portions have sequentially arranged first and second terminal electrodes, and corresponding counter electrodes on the flexible printed circuit boards, with electrical connections established through an anisotropic conductive film, allowing for improved alignment and connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible printed circuit board is crimped to terminal portion using anisotropic conductive film, then electrical connection is achieved, but connection failure occurs due to foreign matter attachment, misaligned crimping, non-uniform crimping pressure, or insufficient heating
Solution Approach 1:
The terminal portion is divided into multiple terminal portions, and the flexible printed circuit board is divided into multiple flexible printed circuit boards. This segmentation allows independent crimping operations for each board-terminal pair, reducing the impact of misalignment or connection failures on the entire assembly. Each crimping operation can be independently controlled and optimized, improving overall connection reliability while maintaining manufacturing precision.
2Reliability
If flexible printed circuit board is crimped to terminal portion, then electrical connection is established, but damage occurs on part or the like during crimping process
Solution Approach 1:
The invention provides configurations that prevent damage during the crimping process. By carefully designing the terminal portion structure and the flexible printed circuit board configuration, and by controlling the crimping parameters (pressure, temperature, time), the invention cushions against potential damage to the organic EL display panel, the terminal portions, or the flexible printed circuit boards during assembly, thereby maintaining structural integrity while achieving reliable electrical connection.
3Productivity
If multiple flexible printed circuit boards are mounted to multiple terminal portions, then manufacturing complexity increases, but manufacturing yield improves through reduced connection failures
Solution Approach 1:
The invention divides the connection system into multiple independent terminal portions and flexible printed circuit boards. This segmentation allows for modular assembly where each board-terminal pair can be independently mounted, inspected, and replaced if necessary. While the overall device has multiple components, the modular nature actually simplifies the assembly process compared to a single complex connection, as each unit can be handled and processed independently, thereby improving manufacturing yield without excessively increasing assembly 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
This configuration enhances the manufacturing yield of the display device by reducing connection failures and enabling the reuse of display panels with mounting failures, thus minimizing waste and improving production efficiency.
Implementation Method 1
electrical connection is established through an anisotropic conductive film
Implementation Method 2
crimping using an anisotropic conductive film (ACF)... insufficient heating
Data Source
AI summary
A plurality of terminal portions provided in a frame region include first and second terminal electrodes sequentially arranged from a display region side and electrically connected to each other, COFs provided corresponding to the plurality of terminal portions, respectively, include first and second counter electrodes sequentially arranged from the display region side to be opposed to the first and second terminal electrodes, respectively, and electrically connected to each other, and in at least one terminal portion of the plurality of terminal portions, the second terminal electrode and the second counter electrode are electrically connected to each other through an anisotropic conductive film.