What They Say
VueReal of Canada published a release that said that its vertical LED structure for microLEDs is now capable of producing LEDs with edge sizes of less than 8?m with production yields of 99.9996%, compared to ‘well below 90%’ for flipchip competitors.
Dr. Fathi, VP of Technology at VueReal, explained that
“the traditional way of making flipchip microLED is based on a two step mesa process that requires twice the processing steps compared to vertical devices. In addition, it makes the main mesa smaller and adds a mechanical weak point for the integration process at the joint boundary.”
The other method used by VueReal’s competitors is based on making the step into a VIA which suffers from the yield loss in passivation opening in the VIA process, relatively large VIA, sensitivity to ESD, and complex process steps.
What We Think
In looking back through our coverage of VueReal, it has been very focussed on the firm’s catridge-based mass transfer technology with few details released of how it makes the very small LEDs. (BR)
VueReal Flipchip microLED (30×15 um²), almost all the microLED area is emitting light.
