LCD Backlight Through Hole for FPC to PCB Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing manufacturing processes for liquid crystal display (LCD) apparatuses face challenges in efficiently and reliably connecting flexible printed circuits (FPCs) and printed circuit boards (PCBs) without additional bulky components, which complicates the manufacturing procedure, increases costs, and may lead to defects and reduced durability of the electrical connection.
Innovation Solution
The implementation of a through hole in the backlight unit that allows for direct electrical connection between the FPC and the PCB, utilizing conductive members, projection parts, or elastic members to ensure contact and stability, thereby eliminating the need for additional volume and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional bulky components are used to connect FPC and PCB, then connection reliability is improved, but device volume and complexity increase
Solution Approach 1:
The patent merges the connection function into the existing backlight unit structure by forming conductive patterns directly on the backlight unit's inner surface. The FPC is bent and positioned such that its conductive pattern contacts the conductive pattern on the backlight unit, which in turn contacts the PCB, eliminating the need for separate connection components and reducing overall device volume while maintaining connection reliability.
Solution Approach 2:
The backlight unit is given a dual function: it serves both as the light source component and as the electrical connection medium between FPC and PCB. The conductive pattern formed on the backlight unit's inner surface enables electrical connection while the backlight unit itself performs its primary function of providing illumination, thereby eliminating the need for additional dedicated connection components.
2Reliability
If traditional connection methods are used, then connection stability is ensured, but manufacturing complexity and costs increase
Solution Approach 1:
The patent combines the connection function into the backlight unit manufacturing process itself. The conductive pattern is formed on the backlight unit's inner surface during its fabrication, and the FPC is bent and positioned to contact this pattern. This integration eliminates separate connection assembly steps, simplifying the manufacturing procedure while ensuring connection stability through the direct contact design.
Solution Approach 2:
The conductive pattern is pre-formed on the backlight unit's inner surface during its manufacturing process, before the FPC and PCB assembly. The FPC is also pre-bent to the required shape. These preliminary actions ensure that when components are assembled, the electrical connection is already established and stable, reducing assembly complexity and improving connection reliability.
3Ease of manufacture
If FPC is connected externally without through hole, then manufacturing is simpler, but connection durability decreases
Solution Approach 1:
The patent implements a nested structure where the FPC is bent and positioned such that it passes through the backlight unit's thickness, with its conductive pattern contacting the conductive pattern on the backlight unit's inner surface. The PCB is positioned on the opposite side, also contacting the same conductive pattern. This nested arrangement within the backlight unit provides protected, durable electrical connections while maintaining manufacturing simplicity.
Solution Approach 2:
The patent transitions from a planar connection approach to a three-dimensional arrangement by bending the FPC and positioning it through the backlight unit's thickness. The conductive patterns are arranged in different spatial dimensions - on the backlight unit's inner surface and on the FPC and PCB - enabling durable electrical connection through vertical stacking rather than lateral connection, thus improving durability without complicating manufacturing.
Data Source
AI summary
A liquid crystal display (LCD) apparatus includes a liquid crystal panel, a printed circuit board (PCB) that generates a driving signal to drive the liquid crystal panel, and a backlight unit between the liquid crystal panel and the PCB. The backlight unit has a through hole formed therein. The LCD also includes a flexible printed circuit (FPC) electrically connected to a driving integrated circuit (IC) of the liquid crystal panel and electrically connected to the PCB in the through hole.