In May 2019, Apple received a few micro-LED patents based on Quantum Dot technologies. In April, Apple won a third patent for micro-LED displays that can be used in future iMac, MacBook, iDevices and even a TV. At the end of July, a rumor surfaced that two Taiwanese micro-LED vendors had been selected to produce a future Apple Watch with advanced micro-LED displays.
Yesterday, Apple discovered a new micro-LED display patent published in Europe on August 1, 2019. Apple begins their application that "State of the art displays for portable electronics, computers and televisions often uses thin-film transistors (TFTs) to control the backlight transmission through liquid-crystal pixels, and later emissive screens like those based on organic light-emitting diodes (OLEDs) have been introduced.
Even recently [1
Apple's invention covers embodiments describing light-emitting structures and methods for forming light-emitting structures. devising a method of forming a light emitting structure to form one or more plurality of LED coupons on one or more corresponding temporary substrates, transferring one or more plurality of LED vouchers to a carrier substrate, patterning one or more plurality of LED vouchers to LED mesa structures, and the transfer of LED mesa structures to a screen surface.
In some embodiments, well structures may also be formed around the LED mesa structures before being transferred to the display support. In addition, hybrid bonding can be used for bonding to the screen backing. The processing sequences according to embodiments can be used to form both monochromatic and full color screens.
In accordance with some embodiments, the processing sequence may enable integration of scaling of the LEDs into small micro-dimensions, and integration of optical structures around and above LEDs with reduced alignment challenges. In addition, integration of reflective well structures and micro-optical elements can additionally enhance light extraction efficiency on the axis.
Apple's patent FIG. 1 below, a process stream and associated cross-sectional side images cover a method of forming a light emitting structure.
Apple's patent FIG. 12A above is a schematic cross-sectional illustration from a side transparent hemisphere high index lens over an LED; FIG. 12B is a schematic illustration of a cross-sectional side view of a transparent cone-shaped high index lens over an LED; FIG. 18 is a schematic top view of a micro-LED in a well structure; FIG. 19-20 are schematic side views of side views of a micro-LED in a well structure.
 Apple's patent application WO2019147589 was published in Europe on August 1, 2019. It was filed on January 22, 2019. Some of the original work on this dates back to 2018. Considering that this is a patent application, the timing of such a product is To market is unknown at this time.
While not an easy read for general Apple fans, it may be of interest to industry experts and display engineers. To see the deeper details, check out the full submission titled "Micro LED Based Panel" here.
Some of the inventors
Dmitry Sizov: Senior Hardware Engineer. He came to Apple via Corning.
John T. Leonard, Ph.D : Display Technologist
Jonathan Steckel : Lead Technologist
Xiaobin Xin : Technologist
Ranojoy Bose: Technologist  I've never seen so many "technologists" listed on a single patent application before.
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