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Micro LED Displays Could Have 90% Non-Active Area
October 3, 2017

Another advantage of Micro LEDs displays is that on average the LEDs occupy only 10% of the total panel area, meaning the remaining 90% is transparent. They can be adopted for transparent displays for retail stores. Alternatively, the empty space can accommodate sensors for measuring temperatures, air pollution particles, and others, making micro LED panels a candidate for smart displays. In Sony's micro LED-based CLEDIS (crystal LED integrated structure) display, the area of a single RGB pixel is 80 x 38 micrometers with a pitch of 1,260 micrometers, which means about 99% of total panel area is vacant. An Apple patent shows that micrometer-size infrared (IR) micro LED chips are embedded in TFT-LCD panels for fingerprint recognition. Key components of conventional fingerprint-recognition modules are IR LED devices, CMOS image sensors and optical lenses. If IR LED devices and optical lenses are replaced with IR micro LEDs and micro optical lenses respectively, the dimensions can be reduced from 33 x 5 x 33mm to 3.5 x 2.5 x 3.5mm.
Chunghwa Picture Tubes indicated at the Touch Taiwan exhibition, that they have overcome the obstacles to manufacturing and expect to have an electroluminescent QD product ready for mass production in two years.  To be fair, thus far they have produced QLED light in their laboratory only, but through an ink-jet printing process, they say they can move the lab work into volume production.  Quantum Dot proponents cite the fact that quantum dots are not made of materials that use heavy metals such as Iridium and Platinum, and are easy to manufacture, control color consistency, and generate high brightness. While CPT is optimistic about being able to solve phase 3 (electroluminescent) quantum dot issues, transferring them to mass production and building the infrastructure needed to support such a change is a significant task. .