Direct Factory Night Vision Backlit Bicycle Speedometer

This device integrates a low‑power LCD with electroluminescent backlight optimized for night‑time readability and a Hall‑effect sensor that measures wheel rotation to compute speed in real time.

Operating Principle

A permanent magnet attached to the spokes passes a Hall sensor mounted on the fork or chainstay each revolution, generating a pulse train. The internal microcontroller counts pulses over a fixed interval and converts the frequency to linear speed using the wheel circumference entered during setup.

The electroluminescent panel is driven by a constant‑current driver that maintains luminance above 30 cd/m² across the operating temperature range (‑20 °C to +50 °C) while consuming less than 5 mA at 12 V.

Key Technical Specifications

Material and Construction

The housing is molded from UV‑stabilized polycarbonate with a tensile strength of ~65 MPa and a flexural modulus of 2.3 GPa, providing impact resistance to 5 J drops from 1 m height. The lens is coated with an anti‑scratch hard‑coat (pencil hardness 9H) to maintain optical clarity after >10 000 abrasion cycles.

The electroluminescent layer uses a phosphor‑doped dielectric stack encapsulated in a thin‑film PET barrier, preventing moisture ingress while allowing uniform light emission.

Typical Applications

• Urban commuting bicycles where riders need reliable speed data in low‑light conditions without external lighting.
• Off‑road mountain bikes operating at dusk or dawn, where glare from headlights can wash out conventional displays.
• Fleet‑managed delivery e‑bikes requiring tamper‑proof speed logging for compliance and maintenance scheduling.
• Specialized velodrome training bikes that demand high‑update‑rate speed feedback for interval training.

Quality Control and Testing

Each unit undergoes a functional test that verifies pulse count accuracy within ±0.2 km/h at 30 km/h, luminance uniformity across the display area (variation <10 %), and insulation resistance >100 MΩ at 500 V DC.

Environmental testing includes thermal cycling (‑20 °C ↔ +50 °C, 100 cycles), humidity soak (85 % RH, 240 h), and vibration sweep (10‑500 Hz, 2 g) per IEC 60068‑2‑6.

Packaging and Lead Time

Standard packaging places each speedometer in an anti‑static PET tray, sealed in a corrugated cardboard box with 50 % recycled content, dimensions 120 mm × 80 mm × 30 mm, gross weight ≈120 g.

Production lead time for stock configurations is 10‑12 working days after receipt of purchase order; customized configurations (backlight color, temperature range, IP rating) add 5‑7 days for tooling validation.

Request a Quotation

To obtain a detailed quotation, please provide the following information: required quantity, desired backlight colour, any special temperature or IP requirements, and preferred delivery terms (EXW, FOB, CIF).

Submit quotation request