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>> The world's first InGaN red Micro LED microdisplay 9th,Nov,2021
On October 19th, Porotech, a spin-off company of the University of Cambridge, stated that its microdisplay broke through the commercialization of AR glasses and created the world's first Micro LED display based on native red InGaN LEDs. This display is a 0.55" diagonal panel with a resolution of 960x540.
So far, only gallium nitride-based light-emitting devices can be used to produce blue and green microdisplays, while red light-emitting devices rely on AlInGaP devices. However, AllnGaP faces a problem under the small pixel size required by AR. As the device size decreases, the efficiency will drop sharply. Moreover, in order to produce a full-color display, the light from different panels must be combined.
Porotech's breakthrough means that a single tool chain can be used to produce all three types of light-emitting elements-it eliminates the complexity of hybrid devices based on different material structures.
"AR technology will change the rules of the game, and Micro LED is particularly important for the advancement of AR interfaces." Porotech CEO and co-founder Dr. Zhu Tongtong said, "In traditional liquid crystal displays (LCD), the light of the image depends on modulation and filtering. Therefore, most of the light generated by the panel is wasted. In addition to this inefficiency, the various filtering, diffusion, and modulation stages of LCD displays also limit the weight of the final display.
"On the other hand, light-emitting display technologies only generate the light they need. Self-luminous displays based on inorganic semiconductors can also be produced in a monolithic manner. Compared with traditional LCD or organic semiconductor displays, they are easier to reduce in size, thereby manufacturing Smaller, lighter, brighter and reliable high-resolution displays."
The obstacle so far is the need to combine light-emitting devices based on different material structures. One solution is to use a prism-but this is a relatively large and cumbersome method.
Overlaying light-emitting layers is another option, but this will result in a different depth of each emitted light color-which will complicate the optical design. Combining LEDs of different materials horizontally on a panel is an alternative method, but this requires very precise placement of each individual LED component and other optical components.
"Porotech's new porous gallium nitride semiconductor material is now redefining what is possible-combining high-efficiency and bright natural red gallium nitride Micro LEDs and microdisplays." Dr. Zhu said. "So far, this has always been our missing piece. In addition to reducing costs, natural red can also achieve wavelengths up to 640nm or higher. Our breakthrough will now accelerate the commercialization of AR glasses, and also herald smart phones and Products such as smart watches will usher in a new era of brighter, clearer, and more vivid micro-displays."
It is reported that Porotech worked with China's Jade Bird Display in August to use porous gallium nitride (GaN) for higher resolution and brighter Micro LED displays in portable designs. It is speculated that the two smart glasses that Xiaomi and TCL Thunderbird released recently use Micro LED, both of which use JBD's Micro LED panels.
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