The Industry's First High Intensity, High Dissipation White LEDs for Backlight and Illumination

ROHM has developed white LEDs in two types of high-intensity, high-radiation packages: PSML1 and PSML2. Developed as an alternative to CCFL (Cold Cathode Fluorescent Lamp) for backlight and illumination use in sets requiring relatively higher intensities, the products incorporate a novel high heat dissipation package in order to efficiently emit 7cd ? the highest in the industry ? using current in the medium range (50-150mA). Proprietary technology was utilized in order to solve the problems of excessive heat generation and low efficiency that have been plaguing mid-range LEDs by increasing the heat dissipation paths to the substrate and adopting an exposed copper frame with high thermal conductivity. The PSML1 features a heat dissipation of 70℃/W and the PSML2 60℃/W, life span is increased, and high temperature operation is possible with no degradation in light intensity or fluctuation in color. These characteristics make them ideal for any application requiring relatively high intensity backlights, such as car navigation systems, portable DVD players, illumination light sources, interior lighting, vehicle indicator displays, and gaming devices.

Sample shipments began in July 2007 (sample unit price: 2US$) and mass production will begin in November 2007 with a monthly production of ten million units.

· Major features of the PSML1/PSML2

1. World's highest light intensity: 7cd at 100mA
2. Original construction ensures the highest thermal dissipation:
   θj–a Value (Thermal Resistance): PSML1: 70℃/W* PSML2: 60℃/W* (*when mounted on an FR-4 substrate)
3. Two package types available for greater compatibility:
   PSML1: 3.2×2.8×0.8mm PSML2: 4.0×2.0×0.6mm

· Glossary

• θj–a Value (Thermal Resistance):
  indicates the temperature difference between the junction temperature (Tj) and the ambient temperature when the device consumes 1W of power. The lower the value, the better the heat dissipation.

	PSML1 and PSML2 Packages for Backlight and Illumination