Apple Patent Reveals ongoing Work on micro-LED displays in Context with Holographic Imagery
Today the US Patent & Trademark Office published a patent application from Apple that relates to micro-LED displays that provide an angle-of-view adjustment layer that may be formed from holographic structures. The patent application is all technical without an overview of how Apple could implement this holographic technology. All we know is that it could apply to any future Apple products from Macs to iDevices, with the iPhone the key focus.
With that said, it should be noted that in August Apple acquired Akonia Holographics, inventors of advanced optical technologies based on Holography for AR Headsets. The company has over 200 patents related to holographic technologies and displays.
In September Patently Apple discovered a patent application from Apple in Europe covering a head-mounted display system for mixed reality and holographic content.
In October a patent application from Apple revealed work being done to integrate a holographic layer into a Quantum Dot Display.
Apple’s technical patent published today notes that display #14 of FIG. 2 below may be an organic light-emitting diode display, may be a display based on an array of crystalline light-emitting diode dies (sometimes referred to as micro-LEDs).
Apple provides an example below wherein component #80 of FIG. 11 includes both a light-emitting device and a light detecting device that allows component #80 to serve as a light-based proximity detector (e.g., a proximity detector in a cellular telephone that determines when an ear speaker in the telephone is adjacent to a user’s ear). Holographic structure MA may overlap the light-emitting device in component #80, which is emitting light #84 outwardly through layer #68. Holographic structure #54A may serve as an input coupler that couples this light 84 from component 80 into layer 24.
Layer #24 may then serve as a thin-film waveguide that guides light #84 to holographic structure #54B. Structure #54B may serve as an output coupler that couples the emitted light out of layer #24 towards external object #82 (e.g., the body of a user or other external object) may reflect the emitted light back towards structure #54B, which may serve as an input coupler that couples light into the waveguide formed from layer #24.
After being guided to structure 54A, which serves as an output coupler, the reflected light is directed towards the light detector in component #80. The emitted and reflected light in this scenario may be, for example, infrared light. If desired, this type of arrangement may be used for any suitable light-based component (e.g., an ambient light sensor, status indicator light, image sensor, etc.). The use of holographic structures and waveguide techniques to redirect and guide light for component #80 may facilitate the incorporation of component #80 within the housing of the device such as an iPhone.
Apple’s patent application 20180321432 titled “Display with Holographic Angle-of-View Adjustment Structures,” was originally filed back in Q4 2017 and published today by USPTO. Considering that this is a patent application, the timing of such a product to market is unknown at this time.
The two inventors listed on the patent are Jonathan Steckel, Emerging Display Technologies; and Jean-Jacques Drolet, Senior Manager of Display Technologies who has moved on to OSRAM Opto Semiconductors.
It should be noted that there’s a second patent associated with the same patent figures. The second patent 20180323242 is titled “Display with Nanostructure Angle-of-View Adjustment Structures.”
In the second patent Apple notes that “the viewing angle for the user is enhanced as the angular spread of the emitted light from the pixels is enhanced by the angle-of-view adjustment layer. The angle-of-view adjustment layer may be formed from holographic structures recorded by applying laser beams to a photosensitive layer or may be formed from a metasurface that is created by patterning nanostructures on the display.