Flexible Circuit Board Side Attachment for Slim Bezel Displays
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Solution Overview
Problem
The challenge in display apparatus manufacturing is to minimize the bezel width while ensuring reliable electrical contact, as existing designs often suffer from increased bezel width due to driving circuits and wirings, leading to potential electrical contact failures.
Innovation Solution
The implementation of a display apparatus with a flexible circuit board attached to the side surface of the display panel using a first anisotropic conductive film (ACF) and a conductive paste part, along with a second ACF film, which includes conductive balls arranged in a matrix form to ensure secure electrical connections and prevent contact failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving circuits and wirings are disposed in the bezel to enable display function, then the display apparatus can operate, but the bezel width is increased and design quality is lowered
Solution Approach 1:
The flexible circuit board is attached to the side surface of the display panel, moving the wiring path from the horizontal bezel area to the vertical side surface area. This dimensional transition allows electrical connections to be routed along the edge of the panel rather than consuming horizontal bezel space, thereby reducing bezel width while maintaining electrical connectivity.
Solution Approach 2:
A flexible circuit board with thin film structure is used to route signals from the side surface to the display area. The flexible nature of this thin film allows it to conform to the side surface geometry and provide electrical connections without requiring additional horizontal space, thus reducing bezel width while ensuring reliable electrical contact.
2Length of stationary object
If the flexible circuit board is attached close to the display area to reduce bezel width, then the design quality improves, but electrical contact reliability deteriorates due to misalignment risk
Solution Approach 1:
An anisotropic conductive film is introduced as an intermediary layer between the flexible circuit board and the display panel. This film contains conductive particles that can bridge misaligned contact points, ensuring reliable electrical connection even when the flexible circuit board is positioned close to the display area with potential alignment variations.
Solution Approach 2:
The anisotropic conductive film changes the electrical conduction parameters by providing conductive pathways in the vertical direction while maintaining insulation in horizontal directions. This parameter change allows electrical contact to be maintained reliably at reduced distances from the display area, enabling slim bezel design without compromising contact reliability.
3Reliability
If multiple layers of ACF film and conductive paste are used to ensure electrical contact, then electrical contact reliability improves, but the device complexity increases
Solution Approach 1:
Multiple functional layers (ACF film, conductive paste, flexible circuit board) are merged into an integrated assembly that is attached as a single unit to the side surface of the display panel. This merging approach ensures reliable electrical contact through the combined action of multiple conductive elements while managing the overall structure as one coordinated system, thereby reducing the practical complexity of assembly and maintenance.
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 allows for a slim bezel design while maintaining reliable electrical contact, even with slightly misaligned components, and prevents electrical contact failures, ensuring stable operation of the display apparatus.
Implementation Method 1
a first anisotropic conductive film (ACF) and a conductive paste part, along with a second ACF film, which includes conductive balls arranged in a matrix form to ensure secure electrical connections
Data Source
AI summary
A display apparatus includes a display panel including a lower base substrate and a connecting portion disposed on the lower base substrate, a flexible circuit board attached on a side surface of the display panel, and including a base film and a conductive pattern disposed on the base film, a conductive paste part disposed between the side surface of the display panel and the flexible circuit board, a first anisotropic conductive film (ACF) film disposed between the side surface of the display panel and the conductive paste part, and a second ACF film disposed between the conductive paste part and the flexible circuit board. The connecting portion is exposed at the side surface of the display panel, and the first ACF film directly makes contact with the connecting portion.