LETI Exhibits GaN-Based Video Micro Display

Highest resolution, smallest pitch prototype on show during Display Week in Los Angeles

Leti is demonstrating what it says is the world’s first wide video graphic array (WVGA) GaN microdisplay with 10micron pixel pitch during Display Week in Los Angeles (May 21-26).

The prototype microdisplay, based on a self-emissive GaN-based technology, features a monochrome (blue or green) active-matrix prototype with WVGA resolution of 873 x 500 pixels, believed to be the highest resolution with the smallest pixel pitch ever presented.

According to LETI, the technology will help address the growing demand for augmented-reality glasses for consumer and professional users, head-up displays for vehicle drivers and for pico projectors and other compact projectors.

The display is made using a technique developed by LETI called micro-tube hybridisation, in which high-density microLED arrays are bonded to a CMOS circuit

“With this result, Leti’s technology has reached an important milestone,” said François Templier, project manager. “We will continue to work towards a 5-micron pixel pitch and, beyond that, on a new technology that will take GaN LED microdisplays to less than a 5-micron pixel pitch.”

Leti is presenting the new technology at Display Week in an invited talk, ‘A Novel Process for Fabricating High-Resolution and Very Small Pixel-pitch GaN LED Microdisplays’. The presentation at 5 pm, May 23, will demonstrate the feasibility of LED arrays with pixel pitch as small as 3micron, which is a world record.

These results presented by Leti were obtained under a collaborative work program with III-V Lab.