Apple is still working on a Touch ID optical under the display | Patent

Although the iPhone does not have more the Touch ID for several generations, there have been various rumors according to which the company is trying to bring the technology on its devices.

Yesterday, the Office of patents and trademarks U.s. has published two patent applications from Apple related to technology.

The first, entitled “optical Transmission, receiving, or sensing through the micro-optical display“,is focused on the sensor optical incorporated below the display screen of a device. The patent says that it could be desirable to capture an image two-dimensional (2D) or three-dimensional (3D) of an object or a user is near a device“, like a fingerprint.

With an optical sensor, a receiver or a transmitter positioned behind a display, the patent says that “the light can be transmitted or received through the openings and translucent that extend from a front surface to a back surface of a stack of the display of the device.“

“In this way, a transmitter, a receiver, or an optical sensor can transmit or receive through a display,“ reads the patent.

The batteries of the display are not always translucent to 100% and Apple detects un method to handle opaque components. In particular, some elements opaque may be opaque with respect to “certain wavelengths of light … but translucent at other wavelengths“. Work around those elements of the matte might result in the positioning of the openings with translucent in a display that extends over the elements opaque. From there, the light can be collimated and directed through the openings and toward an optical receiver or an array of micro-lenses.

“For example, in some cases, an array of micro-lenses can be formed on the back surface of the stack of the display,“ reads the patent. “Each micro-lens in the array may have a focal point located with, aligned with or near one of the openings and translucent.”

Combined with an optical transmitter similar, the technology could allow the reading of the fingerprint through a surface of the display.

The inventor of the first patent shall be Tong Chen, Mark T. Winkler, Meng-Huan Ho, Rui Liu, Xiao Xiang and Wenrui Cai.

The second patent issued, “System for optical detection of fingerprints“, describes in detail a method of temperature compensation in a system for optical detection of fingerprints.

In an attempt to combat the effects of the temperature on the display based on OLED, this patent describes a method to compensate for the temperature differences between the signals.

Other parts of the patent describe various implementations, voltage specifications, and the structures of the components for an optical fingerprint sensor that is embedded in a display.

The two inventors of this patent are Mohammad Yeke Yazdandoost and Christoph H. Krah.

Apple has continued to work on the potential-sensing technology of fingerprints under the display when it has abandoned the Touch ID on the iPhone X in 2017.

However, patent applications are poor indicators of product plans in the future of Apple. Also, do not provide any kind of timeline on when these devices might arrive on the market.