LED Spacer Design for Edge-Lit Backlight Vibration Resistance
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Solution Overview
Problem
Liquid crystal display devices with edge-light type backlights using LEDs are prone to failure due to contact issues between LEDs and optical guides, leading to reliability and lifespan concerns.
Innovation Solution
Incorporating spacers between LEDs and optical guides to prevent direct contact, ensuring proper alignment and impact resistance, thus preventing LED failure and enhancing display reliability and lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are disposed close to the optical guide in an edge-light configuration, then power consumption is reduced and illumination efficiency is improved, but the solder part of the LED is prone to cracking under vibration or shock, causing LED failure
Solution Approach 1:
A resin layer is introduced as an intermediary substance between the LED and the optical guide. This resin layer fills the gap between these components, providing mechanical cushioning and stress distribution that prevents solder joint cracking during vibration or shock, while still allowing close proximity for efficient light coupling
Solution Approach 2:
The resin layer is applied in advance between the LED and optical guide before final assembly, creating a pre-positioned cushioning layer that absorbs and distributes mechanical stresses from future vibrations or shocks, preventing solder joint failure before it occurs
Data Source
AI summary
Plural light-emitting diodes are disposed in an on-line arrangement on a surface a circuit board facing an optical guide and spacers having a projecting dimension larger than the projecting dimension of this light-emitting diode from the surface are disposed adjacent to the light-emitting diode on the surface of the circuit board.