Why Samsung Foldable Screens Bubble and Lose Touch

Analysis of the Galaxy Fold display failure: how hinge geometry and support stress flexible display in foldable phones, causing bulging, touch loss, and blanking.

How Facial Recognition Turnstiles Work

Overview of facial recognition turnstiles for access control and attendance tracking in construction sites and factories, system components, workflows, and configurations.

Face Recognition: Principles and Process

Face recognition primer describing the technical pipeline: image acquisition and detection, data preprocessing, feature extraction, and similarity-based matching.

Single-point, Point, and Multi-touch: Key Differences

Technical overview of multi-touch systems covering sensor types, full-position sensing, gesture recognition, architectures, and real-world applications.

Awinic Trackpad Pressure and Haptic Solution

Technical summary of pressure-sensitive trackpad and haptic feedback implementation, covering Awinic AW8680X/AW86927 architecture, sensor ADC, motor driver, and HID PTP support.

Why Iris Recognition Is Not Widely Adopted

Analysis of iris recognition challenges, advantages and comparison with face recognition, covering accuracy, spoof resistance, cost, device dependence and deployment trade-offs.

Iris Recognition for Smart Door Locks

Iris recognition for smart locks: technical advances - extended recognition range, self-tracking and dynamic matching - improving security and anti-spoofing.

Three Under-Display Fingerprint Technologies

Technical overview of under-display fingerprint technologies—optical, ultrasonic, and capacitive—examining principles, trade-offs, production challenges, and market maturity.

TVS Diode Causing Power-On Short in Industrial Touchscreen

Incident report on an industrial touch screen where a failed TVS diode caused a power short; troubleshooting, diode role, selection guidelines, and transient protection advice.

Capacitive Touchscreen: Principles and Troubleshooting

Technical overview of capacitive touchscreen design, projected capacitive operation, optical artifacts, false touches, and calibration and driver guidance for reliable operation.

Resistive vs Capacitive Touchscreens: Key Differences

Comparison of resistive and capacitive touchscreens covering sensitivity, accuracy, durability, cost, multi-touch, and environmental tolerance.

Comparing Emerging Materials for Touch Panels

Overview of metal mesh as an ITO alternative for touch panels: materials, fabrication methods, adoption and key challenges in transmittance, line width, and durability.

How Fingerprint Unlock Works

Overview of fingerprint recognition: pattern types, optical/capacitive/RF capture methods, processing workflow from quality evaluation to feature extraction and matching.

Types of Touchscreen Technologies

Technical overview of touchscreen technology, system architecture, and comparison of resistive and capacitive touch sensing methods used in embedded devices.

Why Touchscreens Require Skin Contact to Respond

Explains resistive vs capacitive touchscreen operation, why resistive needs pressure and capacitive relies on body coupling; effects of gloves and water.

Why modern touchscreens no longer need calibration

Explains why early resistive touchscreens required user calibration and why modern capacitive touchscreens typically avoid calibration by using capacitance-based position sensing.

Touchscreen Technologies: Principles and Applications

Technical overview of touchscreen technologies comparing resistive, capacitive touch, wave-based and embedded (on-cell/in-cell) designs, applications, and performance trade-offs.

Why Capacitive Touch Became Dominant

Analysis of capacitive vs resistive touch: principles, form factors, strengths and weaknesses, and why capacitive touch became the mainstream choice.

Flexible Strain Sensor for Gesture Recognition

Flexible strain sensor (serpentine meander, GF>1000) combining high sensitivity and mechanical robustness, integrated into a wearable system for real-time sign language translation.

Capacitive Touch Key Design for Bluetooth Door Locks

Capacitive touch-key design with CH582/CH583 Bluetooth SoCs and drive shielding: prototype signal improvement, reference schematic, and low-power operation (~15 uA standby).