Flexible Circuit Board Interconnect for Display Panel PCB Assembly
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Solution Overview
Problem
The manufacturing of display devices is costly and involves a complex process due to the large area and high resolution of display panels, which require extensive circuits and electronic devices for signal processing, leading to increased size and number of components.
Innovation Solution
The design includes a display panel divided into areas with adjacent printed circuit boards and flexible circuit boards, where anisotropic conductive films and thermal compression are used to connect pad parts, simplifying the connection structure and process, and reducing the complexity of connecting the printed circuit boards and output flexible circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display panel has large area and high resolution, then the display quality is improved, but the number of circuits and electronic devices increases leading to higher manufacturing cost and complexity
Solution Approach 1:
The control unit is divided into multiple independent printed circuit boards (first PCB, second PCB, third PCB) that can be manufactured separately and then assembled together. Each PCB handles specific functions (control signals, image data, power), reducing the complexity of individual boards while maintaining high-resolution display capabilities through coordinated operation of multiple boards.
2Measurement precision
If more circuits and electronic devices are added to handle large area and high resolution, then the display performance is improved, but the manufacturing cost increases
Solution Approach 1:
Dividing the control unit into multiple PCBs enables parallel manufacturing of simpler individual boards, which can be produced more efficiently and at lower cost than a single complex board. The modular design allows standardization of components and processes across multiple boards.
Solution Approach 2:
Each printed circuit board is designed to perform multiple functions (signal processing, power distribution, control) to reduce the total number of specialized components needed. For example, the first PCB handles both control signals and power for data drivers, consolidating functions that would otherwise require separate circuits.
3Productivity
If the number of circuits and devices is increased for high resolution display, then the data processing capability is improved, but the size of control unit increases
Solution Approach 1:
The control unit is arranged in a three-dimensional configuration with PCBs stacked or positioned at different heights, connected by flexible circuit boards. This vertical arrangement allows high data processing capability while minimizing the horizontal footprint, effectively utilizing the Z-dimension to reduce overall volume.
Solution Approach 2:
The flexible circuit boards are positioned within or between the rigid PCB structures, nesting the connection pathways within the existing component layout. This nested arrangement minimizes additional space requirements for inter-PCB connections.
4Device complexity
If multiple printed circuit boards are used to reduce complexity of individual boards, then the manufacturing process becomes more complex due to additional connection requirements
Solution Approach 1:
Flexible circuit boards are used to connect the rigid PCBs, providing bendable, lightweight interconnections that can accommodate the three-dimensional arrangement of PCBs. These flexible connectors simplify the assembly process compared to rigid wired connections, as they can be pre-assembled and snap-fit into place without complex wiring harnesses.
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 approach reduces manufacturing costs and simplifies the process by enabling efficient connection of circuit boards and data lines, facilitating the driving of display panel areas with control signals and image data, while maintaining effective data transmission.
Implementation Method 1
anisotropic conductive films and thermal compression are used to connect pad parts
Implementation Method 2
the connecting flexible printed circuit board may include a third connection pad part connected to the first connection pad part and a fourth connection pad part connected to the second connection pad part by an anisotropic conductive film
Data Source
AI summary
A display device includes a display panel having a first area and a second area that is adjacent to the first area in a first direction, a first printed circuit board including a first body part facing the first area in a second direction that is different from the first direction and a first extension part extending from the first body part, a second printed circuit board including a second body part facing the second area in the second direction and a second extension part extending from the second body part and facing the first extension part in the second direction, and a connecting flexible circuit board having one end connected to the first extension part and the other end connected to the second extension part.