The Death of the Button: Inside the Hardware Race for Seamless AI

SAN JOSE, Calif. – September 21, 2026

When Apple introduced the Camera Control module in its iPhone 16 series, the consumer electronics industry recognized it as a crucial validation of multi-modal, solid-state interfaces. Yet, for all its engineering brilliance, the Apple implementation remained a half-step. It still required a physical chassis cutout, a sapphire crystal cap, and a tactile mechanical switch underneath. For the hardware engineers designing the next generation of artificial intelligence wearables, mechanical switches and chassis cutouts are glaring liabilities.

The true holy grail of the "Physical AI" era is a completely unibody, button-free device that can survive drops, dust, and deep water without sacrificing tactile control. Today, that vision moved closer to commercial reality. San Jose-based fabless semiconductor startup UltraSense Systems and South Korean Tier-1 electronics manufacturer Partron have signed a Memorandum of Understanding (MOU) to jointly develop and commercialize next-generation solid-state, ultrasound-based human-machine interface modules for AI wearables and mobile devices.

While the agreement is currently a non-binding framework, the strategic alignment is undeniable. It represents a classic, highly effective industry maneuver: pairing disruptive Silicon Valley physics with established Asian manufacturing muscle.

Silicon Valley IP Meets Asian Manufacturing Muscle

In the hardware world, inventing a breakthrough sensor is only ten percent of the battle. The remaining ninety percent is figuring out how to manufacture it flawlessly across millions of units without destroying profit margins. UltraSense Systems, backed by investors like Bosch and Abies Ventures, has spent years perfecting its Ultrasound Intelligent Platform. The technology utilizes Piezoelectric Micromachined Ultrasonic Transducers (PMUT) paired with mixed-signal ASICs to detect touch through solid materials.

However, UltraSense is a fabless IP company. To transition from experimental design to global mass-market consumer electronics, it requires a partner capable of executing System-in-Package (SiP) miniaturization, printed circuit board assembly, and automated surface-mount production.

Enter Partron. Spun off from Samsung Electro-Mechanics in 2003, Partron is a $1 billion manufacturing powerhouse with automated assembly facilities across South Korea, China, and Vietnam. The company is already an incumbent supplier to Samsung's Mobile eXperience division, providing camera modules, biometric sensors, and RF antennas for the Galaxy ecosystem.

"The new Physical AI era will require better interfaces between people and intelligent devices," said Mo Maghsoudnia, CEO of UltraSense Systems. "Our collaboration with Partron brings together advanced sensing and strong product execution to create more intuitive experiences for the devices that are yet to come."

Mr. Won-Kuen Kim, CEO of Partron, echoed the pragmatic focus on speed and scale. "We see significant opportunities for new interaction technologies across AI wearables and smartphones. Together, we aim to help customers implement differentiated interface technologies, accelerate product development, and bring innovative, scalable products to market faster."

Bypassing the Limits of Capacitive Touch

To understand why this partnership matters, one must strip away the marketing hype and look at the physics of modern device design. For years, the industry relied on capacitive touch—the same technology used in smartphone screens. But capacitive sensors have a fatal flaw when applied to the exterior chassis of premium hardware: they fail on conductive metals.

Because metals act as ground planes that dissipate electrostatic charges, capacitive sensors require unsegmented dielectric materials like glass or plastic cutouts to function. Furthermore, capacitive solutions are notoriously vulnerable to moisture. A drop of sweat or rain can cause parasitic capacitance, leading to frustrating false actuations.

UltraSense bypasses these limitations entirely by abandoning electrostatic fields in favor of acoustic wave pulse-echo reflection. The company's transducers transmit an ultrasonic pulse directly through solid exterior casings—including aluminum, stainless steel, and titanium up to five millimeters thick. When a human finger touches the surface, the acoustic boundary impedance changes, registering a touch event. Because human tissue has a distinct acoustic signature compared to water or fabric, the system is fundamentally immune to false triggers from rain or wet environments.

To further guarantee accuracy, UltraSense integrates a sensor-fusion layer into its controllers. By etching microscopic AC-piezoelectric strain sensors directly onto the ASIC alongside the ultrasound transducers, the chip measures both the acoustic impedance of the touch and the structural micro-strain of the press. Unless both conditions are verified by embedded machine learning algorithms, no click is registered. This eliminates the accidental pocket-dials and phantom clicks that plagued early solid-state experiments.

The Form Factor Forcing Function: Rings, Glasses, and Pins

The urgency behind the UltraSense and Partron alliance is being driven by the rapid evolution of AI hardware. According to recent supply chain data, traditional smartwatch shipments are plateauing, while smart glasses and smart rings are expanding at double-digit compound annual growth rates. These new form factors demand a radical rethinking of the human-machine interface.

Consider the smart ring. Devices like the Samsung Galaxy Ring or the Oura Ring are packed with biometric sensors, leaving absolutely zero internal volume for mechanical button assemblies. Furthermore, premium rings are crafted from titanium or tungsten carbide, materials that block traditional capacitive fields. UltraSense's ultrasound technology can transmit directly through a solid titanium band, enabling users to scroll, tap, and swipe through their AI assistant menus without compromising the jewelry-like aesthetic or the hermetic seal of the device.

Smart glasses present a similar engineering hurdle. Mechanical buttons placed on the temples of AR frames tend to rattle internal micro-speakers, collect sweat and hair oils, and break down under the daily torque of being folded and unfolded. Capacitive temple pads are equally problematic, often triggering unintended interactions when users simply adjust their frames in the rain. Ultrasound allows for touch-on-metal or touch-on-acetate temples that only register deliberate skin contact and intentional pressure, a necessity for the seamless integration of AI into daily eyewear.

From Framework to Factory Floor

Despite the undeniable technical synergies, the pragmatic observer must note the current stage of this collaboration. The MOU establishes a framework, but it does not yet represent a binding production contract with minimum volume commitments.

The immediate road ahead involves rigorous prototyping. Engineering teams from both companies are expected to spend late 2026 and early 2027 integrating UltraSense's specialized silicon—such as the UltraTouch AR2 for smart eyewear and the UltraTouch RG1 for smart rings—into Partron-packaged SiP modules. By the first half of 2027, Partron will leverage its Tier-1 status to introduce these co-developed modules to major mobile and wearable OEMs for integration into upcoming hardware roadmaps.

Given standard consumer hardware development cycles, which typically require twelve to eighteen months from design-in to retail release, commercially branded products utilizing this joint technology are unlikely to hit the consumer market before late 2027 or early 2028. However, Partron's deeply entrenched relationship with Samsung Electronics provides an obvious and immediate deployment vector. With Samsung aggressively expanding its Galaxy Ring, Galaxy XR glasses, and ultra-slim foldable portfolios, the South Korean tech giant represents a massive, pre-audited pipeline for this new solid-state interface.

Beyond consumer portables, the implications of this technology stretch into the broader industrial landscape. UltraSense has already secured automotive-grade qualifications for its controllers, and its acoustic impedance tech is being adapted for robotic grippers and humanoid hands, allowing machines to detect slip, shear, and grip pressure without exposing sensitive silicon to abrasion.

As artificial intelligence increasingly moves out of the data center and into the physical world, the way we interact with our devices must fundamentally change. The mechanical button, a relic of the industrial age, is finally reaching its physical limits. Through partnerships like the one between UltraSense and Partron, the next era of computing hardware will be defined by interfaces that are entirely invisible, yet perfectly tactile.