Planar Light Source Circuit Board Fixing Structure
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Solution Overview
Problem
In planar light source devices, the position of Flexible Printed Circuit (FPC) boards can shift due to external forces during connector insertion or removal, leading to connection defects, unstable power supply to point light sources, and reduced display quality due to non-uniform brightness.
Innovation Solution
A planar light source device configuration with a circuit board having a protruding portion that is fixed both internally and externally within a frame, preventing shifts during connector operations, ensuring reliable connection and stable power supply to point light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the FPC is fixed using a general double-stick tape, then the FPC position is stabilized, but the connector may shift when external force is applied during connector insertion or removal
Solution Approach 1:
The FPC is divided into two separate fixing portions: a first fixing portion for stabilizing the overall FPC position, and a second fixing portion specifically for securing the connector position. This segmentation allows each portion to optimize its function independently, preventing connector shift during insertion/removal while maintaining overall FPC stability.
Solution Approach 2:
Different fixing mechanisms are applied to different locations of the FPC. The first fixing portion uses a general double-stick tape for overall positioning, while the second fixing portion employs a specialized structure (such as a clamp or additional adhesive mechanism) specifically at the connector location to prevent shift during external force application.
2Reliability
If a double-stick tape with strong adhesive strength is selected to prevent FPC shift, then connection reliability improves, but cost and thickness increase
Solution Approach 1:
The fixing system is segmented into two portions with different adhesive strength requirements. The first fixing portion uses a standard double-stick tape for general positioning, while the second fixing portion uses a targeted, stronger fixing mechanism only where needed (at the connector location), avoiding the need for a uniformly strong adhesive across the entire FPC.
Solution Approach 2:
Instead of applying strong adhesive uniformly across the entire FPC, the strong fixing mechanism is applied locally only at the connector portion where shift prevention is critical. This localized approach maintains connection reliability while reducing overall material usage, cost, and thickness.
Data Source
AI summary
A planar light source device includes: a point light source that emits light; a circuit board that has a mounting portion, on which the point light source mounted, and a fixing portion, on which a connector supplying electric power to the point light source is mounted; and a frame that holds the circuit board with the point light source, wherein the circuit board has a protruding portion that protrudes from an end portion of the fixing portion, and wherein the fixing portion of the circuit board is fixed at an inner portion of the frame, and wherein the protruding portion of the circuit board is fixed at an outer portion of the frame, which is opposite to the inner portion of the fixing portion.