First monolithic GaN microLED microdisplay for AR
Porotech in Cambridge has developed the world’s first single-panel, full-colour microLED microdisplay for augmented reality (AR) applications.
The microdisplay uses Dynamic Pixel Tuning (DPT) technology, where microLED pixels can emit any visible colour when driven with a specific current density. The 0.26in active matrix monolithic microdisplay, along with an AR development platform, will be shown at the SID Display Week in Los Angeles next week.
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The 1280×720 microdisplay integrates a proprietary driving method developed by Porotech that rapidly displays red, green and blue light to enable a full-color RGB display and richly saturated colours. The display is built with a single LED epitaxial growth and a one-step wafer-to-wafer bonding to the CMOS backplane, simplifying the microLED manufacturing process, increasing yield and reducing costs.
Based on existing backplane technology, the 3.5-micron microLEDs are fabricated on a 4.5-micron pixel pitch. Porotech’s microLEDs emitter size can be larger while keeping the resolution because subpixels are no longer required.
The DPT pixel architectures can be implemented in monolithic display architectures or as discrete devices that can be mass transferred for direct-view LED applications.
”This new single panel full colour microdisplay marks a significant milestone for Porotech and the entire microLED industry, as only DPT pixels can meet the specification, performance, reliability, and cost required for AR glasses,” said Porotech founder and CEO Tongtong Zhu “DPT also opens the market for additional display applications using microLEDs beyond AR/VR including smart watches, smart phones, tablets, flat panel TVs to large panel displays for commercial outdoor signage.”
