OSRAM LED Light Source KRTTB CRLML1.33

Micro-projection optical engines combined with waveguide technology have proven to be the best choice for lightweight augmented reality glasses. Among them, display optical engines using LCOS/DLP + LED solutions are relatively mature in technology and represent an important technological direction for micro-projection optical engines to further advance in key parameters such as lightweighting, full color, large field of view, high resolution, and low cost.

ams' latest compact 4-in-1 RGGB LED KRTTB CRLML1.33 from OSRAM LED boasts advantages such as high luminous efficiency, small size, easy heat dissipation, and integration, making it an excellent choice for high brightness, miniaturization, and full color in micro-projection optical engines.

1. Solution Advantages and Key Features

2. Technical Principles - Optical Design

For the illumination system of a micro-projector, the most important thing is how to achieve a relatively uniform illumination field in terms of color and brightness, and how to make the entire optical system compact to better meet the special application scenario of glasses.

The OSRAM LED KRTTB CRLML1.33 integrates four high-efficiency red/green/green/blue LED chips, reducing the overall light-emitting size to 1.1mm x 1.1mm. This reduces the number of optical components required for homogenization and color mixing, lowers the assembly difficulty and precision of the optical engine, and significantly reduces its size. However, the asymmetrical arrangement of the chips also presents challenges for homogenization and color mixing, especially for red and blue illumination. Since the chips are only distributed across 1/4 of the overall light-emitting area, uneven brightness and color are more likely to occur within the overall illumination area after homogenization and color mixing.

OSRAM LED KRTTB CRLML1.33 Chip Arrangement and Light-Emitting Surface Size

This places high demands on the homogenization component of the optical design. Currently, the main homogenization and color mixing methods in the industry include light guides and compound eye lenses. Compound eye lenses, as the name suggests, are composed of a series of small lenses. Their high light utilization and good homogenization and color mixing effects are widely used, effectively eliminating color differences and achieving a uniform illumination field.