Apple Invents a Stylus Signal Detection and Demodulation Architecture

As touch sensing technology continues to improve, touch sensitive devices are increasingly being used to compose and mark-up electronic documents. In particular, styli have become popular input devices as they emulate the feel of traditional writing instruments. Most conventional styli simply include a bulky tip made of a material capable of interacting with the touch sensitive device in a manner resembling a user's finger. As a result, conventional styli lack the precision and control of traditional writing instruments.

A stylus capable of receiving stimulation and force signals and generating stylus stimulation signals that can be transmitted to the touch sensitive device can improve the precision and control of the stylus. However, in order to have stylus inputs appear smoothly on a display and integrate seamlessly with the touch and display functionality of the touch sensitive device, the stylus can be synchronized with the display and touch controllers on the device.

Apple's invention relates to a stylus signal detection and demodulation architecture that can allow for the stylus, display, and touch to be synchronized with one another.

In one example, during acquisition of a touch image, acquisition of a bank of touch data can be delayed in order to accommodate a scheduled and periodic stylus signal acquisition, thus synchronizing the touch and stylus functions. The touch image and the stylus image can be reported by their respective controllers to the device when a synchronization pulse is provided by the display, thus synchronizing the touch and stylus acquisition to the display refresh process.

The top patent figures below illustrate that the new stylus architecture will be able to work with touch display's covering Apple's main devices such as an iPhone, iPad and MacBook. Patent FIG. 2 illustrates a block diagram of an exemplary stylus and patent FIG. 3 illustrates a control system for a touch sensor that can detect both a user's touch and signals from a stylus.

Patent Credits

Apple credits Shahrooz Shahparnia, Christopher Mullens and Martin Grunthaner as the inventors of patent application 20140354555 which was originally filed in Q2 2013.

There's a lot of detailing to this invention and for those interested in reviewing the full application, click here. Apple has been working on a smart pen prior to the iPhone and you could review their large body of patent application here. Considering that this is a patent application, the timing of such a product to market is unknown at this time.

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