Flexible Printed Circuit Board Notch Design for LCD Damage Prevention
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Solution Overview
Problem
Conventional liquid crystal display devices suffer from damage to flexible printed circuit boards when they come into contact with the outer frame, as existing solutions fail to prevent such damage due to structural limitations.
Innovation Solution
The design incorporates a flexible printed circuit board that is bent and extends over the surface of the outer frame's bottom surface portion, with notches formed on the end portion, allowing the circuit board to overlap the outer edge at an angle of 45° or less, thereby reducing the risk of damage when contact occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is extended straight without bending, then the electrical connection is simple, but the circuit board comes into contact with the outer frame causing damage
Solution Approach 1:
The flexible printed circuit board is configured to bend at a specific position, creating a curved path that allows it to extend over the bottom surface portion of the outer frame. This curvature prevents direct contact between the circuit board and the outer frame, eliminating the damage issue while maintaining electrical connectivity.
2Reliability
If the circuit board is bent to avoid contact, then damage is prevented, but the bending creates stress concentration points
Solution Approach 1:
A notch is formed in advance at the position where the circuit board bends. This preliminary structural modification allows the circuit board to bend smoothly without creating stress concentration points, maintaining the strength and flexibility of the board while preventing damage from contact with the outer frame.
3Reliability
If the inner frame is projected to prevent contact, then the circuit board is protected, but the structural complexity increases
Solution Approach 1:
The bottom surface portion of the outer frame serves as an intermediary element between the circuit board and the outer frame body. By extending the circuit board to overlap this bottom surface portion, contact is prevented without requiring modifications to the inner frame structure, thus avoiding increased structural complexity.
Data Source
AI summary
A flexible printed circuit board is pulled out to the outside from an end portion of the bottom surface portion. A notch is formed on a tip end of the end portion of the bottom surface portion such that an inner edge of the notch and an outer edge which projects from the notch are contiguously formed. A side of the flexible printed circuit board is arranged so as to overlap the notch. The outer edge of the bottom surface portion which projects overlaps the flexible printed circuit board. An angle made by a straight line which connects an intersecting point between the side of the flexible printed circuit board and the inner edge and a point of inflection between the inner edge and the outer edge and the side of the flexible printed circuit board is set to 45° or less.