LED Backlit Membrane Switch: Complete Design & Technology Guide
LED Backlit Membrane Switch: Complete Design & Technology Guide An LED backlit membrane switch integrates a thin, flexible membrane circuit with LED illumination to create a user interface (UI) that is durable, low-profile, and visible in low-light or harsh environments. It is widely used in medical devices, industrial control panels, consumer electronics (e.g., home appliances), and automotive dashboards. Below is a comprehensive breakdown of its design principles, core technologies, manufacturing processes, and key considerations. 1. Core Components of an LED Backlit Membrane Switch A typical LED backlit membrane switch consists of 7–9 layered structures, each with a specific function. The layers are laminated under controlled pressure and temperature to ensure adhesion, flexibility, and electrical performance. Layer Name Material Key Function Top Graphic Overlay Polyester (PET, 0.1–0.2mm) - Protective surface (scratch/wear-resistant) - Displays UI element...