Porotech Shows New MicroLED Devices and Solutions at DisplayWeek

Porotech showed Adaptive DPT and new microLED devices coming from their partnerships with TSMC and Foxconn to develop the microLED ecosystem.

Chris Chinnock for Insight Media at DisplayWeek 24 in the Porotech booth. Let’s take a look at their microLEDs. The first thing I want to highlight here is an innovation in their DPT, that’s Dynamic Pixel Tuning. So Dynamic Pixel Tuning is a technology that Porotech developed where a single LED device can take on any of these colors. It’s just a matter of current and waveform. So, you can choose anything between the blue, the green, or the red depending on what you choose and how you drive it. So that’s really powerful because it could give you all kinds of flexibility in how you design your microLED.  For example, you could have higher density or bigger devices with lower resolution. Lots of options. What they’re talking about here is adaptive DPT. The idea is if you have AR glasses on and you’re looking at a specific environment, an outdoor environment or whatever environment, you can change the AR image. If you have a monochrome display, if it’s monochrome green and you’re looking at content with a green background, the contrast is going to be hard to see, right. There are ways to solve that. You can use a camera to look at that background and do image processing to change the image so it would instead of being green it might go to some other color.  But that takes power and signal processing. With the DPT it’s different and that’s what this demo shows. It has a little camera sensor here that’s looking at the scene that’s playing on the screen. It senses that background but instead of doing image processing it can just change the waveform to change the color of that DPT pixel. So, if you start with a DPT array, here I’m trying to get into the field of view but I don’t think the camera’s going to be able to do this, but I can tell you having seen the demo that the color does change. You can see it go from red to green to orange depending on the background. So that’s actually pretty cool. Let’s also talk about some of the other products that they’ve got here.

New for the show is this 0.12  device. It is green only right now with these specifications: 640x 480, 3.75-micron pitch and three micron device. This is the smallest one they’re making right now. The idea is to prove it out on green then they’ll move on to red, blue, and DPT. They also have a prototype that is a color converted device. I’m not sure of – they weren’t too clear on the size, but it is full HD resolution with a 3×8 micron device. This is obviously color converted with quantum dots and photo lithography. It is still in development obviously. And then they just have some demos here of this this new 0.12 device integrated into a waveguide. They’re also showing the 0.26-inch devices that they’ve had for a couple of years.

And then there is a new device also. This is a 0.61-inch device with red, green, and blue versions of this are available as well. What they’ve done here is put this together as a Pico projector demo. They bought a backplane from a supplier, and they processed red, green, and blue wafers. Those are then cut up and packaged and put into an X cube combination for this projector demo as shown here. They don’t have the luminance on this on this guy but it’s not too bad. I mean pico projectors are pretty dim to begin with so this could be, maybe, a viable product. It’s XGA resolution. That same device, but a green only version, was put into this AR HUD demonstrator over here. It’s not really an AR HUD because it’s just limited field of view, I mean, there’s no real specs on what this thing is as a HUD. They just put this kind of arbitrary configuration here to show it could be put into a HUD application. They’re really putting this together to see if they can attract customers for a device like this. Obviously, a panel that’s bigger, like this 0.61 inch allows you to use bigger microLEDs and allows you to get to higher luminance.

This is their full workflow. They basically buy and process the LED Epi Wafers themselves because they have this special PoroGaN layer to create the DPT pixel. This is all done on Silicon. Then, they mate the microLED wafer in a wafer bonding process to the driving circuit in the CMOS wafer and separate them. This is one of the key microLED ecosystems that’s starting to develop. It’s Porotech, TSMC and the Foxconn group trying to develop a more mass-produced ecosystem for microLEDs.   And then you’ve also got the AUO, PlayNitride group also trying to develop their own ecosystem. So that’s pretty much the story here at DisplayWeek in the Porotech booth. Chris Chinnock for Insight Media.

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