Display Panel-FPC Connection Lines for High-Resolution Bonding
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Solution Overview
Problem
The challenge of accurately bonding pads on a flexible printed circuit board with pads on a display panel becomes more pronounced with increasing resolution, leading to alignment issues and potential short circuits due to small gaps between these components.
Innovation Solution
A manufacturing method involving a flexible printed circuit board and a display panel with integrated connection lines formed by laser beam radiation, allowing precise alignment and bonding without precise initial alignment, forming a single and indivisible body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of pad and pitch is decreased to achieve high resolution, then the image resolution is improved, but the alignment precision between flexible printed circuit board and display panel deteriorates
Solution Approach 1:
The bonding structure is divided into multiple segments: a first bonding pad on the display panel, a second bonding pad on the flexible printed circuit board, and a connection line bridging them. This segmentation allows each component to be optimized independently while maintaining overall alignment accuracy through the connection line's extended path.
Solution Approach 2:
The connection line extends in the thickness direction (vertical dimension) to connect the first bonding pad and second bonding pad. This dimensional transition allows the connection to bridge horizontal misalignment gaps by utilizing the vertical space between the bonded surfaces, effectively converting a 2D alignment problem into a 3D solution.
2Measurement precision
If the gap between flexible printed circuit board and display panel is reduced to achieve higher resolution, then the image quality is improved, but the risk of short circuit increases
Solution Approach 1:
The connection line is positioned specifically in the non-display region where it can provide electrical connection without interfering with the display pixels. This localized placement allows the connection line to bridge the gap safely without creating short circuits in the sensitive display region, while still enabling high-resolution imaging.
Solution Approach 2:
The connection line acts as an intermediary element that bridges the first bonding pad and second bonding pad across the gap between the display panel and flexible printed circuit board. This intermediary structure provides a controlled electrical path that prevents direct contact between adjacent pads, thereby eliminating short circuit risk while maintaining signal transmission.
3Manufacturing precision
If precise initial alignment is required for bonding pads, then the bonding accuracy is improved, but the manufacturing complexity increases
Solution Approach 1:
The connection line is pre-formed on the flexible printed circuit board before bonding to the display panel. This preliminary action allows the connection line to be precisely positioned and formed in advance, reducing the alignment complexity during the final bonding process while ensuring accurate electrical connection between the first and second bonding pads.
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
Enables accurate electrical connection between the components, preventing short circuits and ensuring high-resolution image implementation.
Implementation Method 1
forming, by radiating a laser beam onto the first integration pad, a first opening and a second opening through the first integration pad
Data Source
AI summary
A display apparatus includes: a substrate including a display region and a non-display region outside the display region; a first line disposed on an upper surface of the substrate in the non-display region of the substrate, where the first line has a first height; a flexible printed circuit board; a second line disposed on a lower surface of the flexible printed circuit board, where the second line has a second height; and a connection line located in a portion in which the substrate and the flexible printed circuit board overlap each other and disposed between the substrate and the flexible printed circuit board, where in the connection lines has a third height greater than each of the first height and the second height, one end of the connection line is connected to the first line, and another end of the connection line is connected to the second line.