Displays

Compact LEDs boast reduced light leakage

11th May 2020
Mick Elliott

Compact high output surface mount LEDs designed with moulded lenses to optimise intensity are available at distributor TTI.

This new line-up includes 18 devices, comprised of the Rohm Semiconductor CSL0901 Series featuring standard brightness and the high brightness CSL0902 series.

LEDs are optimised for uses in industrial, medical and automotive systems.

This newest series consists of automotive-grade products that ensure high reliability in vehicle instrument clusters which operate under harsh environments.

Raising the light source position from 0.18mm in standard products to 0.49mm allowed Rohm to significantly reduce light leakage.

Meanwhile, size was reduced by approximately 18x compared to conventional reflector-type LEDs.

In addition, all devices are designed to prevent light degradation even under harsh high temperature environments.

Rohm also developed a new type of resin for blue, green and white LEDs to achieve higher reliability.

As a result, during high temperature testing with blue LEDs (85°C, IF=20mA, 1,000hrs operation), the residual luminosity rate was imporved by approximately 80% over conventional products, contributing to greater application reliability.

Furthermore, achieving higher precision during the manufacturing process (i.e. die bonding, moulding) while maintaining the compact 1608 size (1.6x0.8mm) made it possible to increase core brightness by 5 to 7 times over conventional LEDs.

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