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Doug Dykaar: Ultimate supreme executive chairmanPast Role: Sirific Wireless, Lab Manager
-Displays are a $100B market and Active-Matrix Organic Light-Emitting Diodes (AM-OLEDs) are a key technology for next generation displays. In order to make these large area displays, AM-OLEDs require a high-performance transistor backplane that can deliver current at high speed to drive the light emitting pixels. Existing amorphous Si devices used
in Liquid Crystal Display (LCDs) do not have the necessary performance for large AM-OLED displays.Fundamentally, LCDs use voltage devices, and AM-OLEDs require current devices.
Currently, the transistor backplane technologies, Exotic metal oxides, poly-crystalline Si and amorphous Si are all used in AM-OLED displays, and all suffer from low driving current and carrier mobility in addition to cost and manufacturability issues. Single crystalline silicon, with electron mobility 10 times higher than that of poly-Si, offers the necessary performance, but Si wafers are far too small.
Here a ceramic substrate is patterned and the holes populated with single-crystal Si spheres. The assembly is planarized to expose the interior Si surface.
The flat cross section and planar surface allows the use of standard photolithographic device fabrication techniques. Because the spheres are purified in a separate process, high-purity single-crystal material can be realized using high temperature processes not available to amorphous silicon on glass substrates because the glass substrate melts at temperatures lower than standard silicon processing temperatures. Standard display fabrication processes can then be used.
https://www.researchgate.net/publication/263701906_44.4L_Late-News_Paper_Large_Area_Display_Backplane_Using_Embedded_Single-Crystal_Silicon_Particles
