ALLPCB
Iris Recognition: Principles and System Overview
Technical article about electronics and hardware engineering.
Fixing Capacitive Touchscreen Malfunctions
How capacitive touchscreens work and causes of touchscreen drift (capacitance drift), including contamination, unstable supply, temperature, static, plus troubleshooting steps.
Tablet capacitive touchscreen: G+G vs G+P structure
Comparison of capacitive touchscreen types (G+G vs G+P): differences in hardness, optical transmittance, chemical resistance, touch feel, bonding reliability, and cost.
How Smartphone Touchscreens Work
Overview of resistive and capacitive touchscreens: how capacitive touch detection uses coupling capacitance and ITO sensing layers, plus limitations like wet-screen drift.
Face Recognition Visitor System: Workflow and Applications
Overview of face recognition visitor systems workflow, applications and vendor selection criteria — recognition accuracy, integration, and maintenance.
Are Facial Recognition Systems Secure?
Technical overview of facial recognition system security, covering information protection, contactless health benefits, privacy concerns, and regulatory trends.
Principles of Touch-Sensitive Switches
Overview of touch-sensing methods - capacitive touch, resistive touch, and radio-reception sensing - comparing principles, implementations, and environmental limitations.
Side vs In-Display Fingerprint: Which Is More Efficient?
Compare in-display fingerprint vs side-mounted sensor: technical principles, capacitive vs optical performance, interference resilience and usability trade-offs.
Adding Capacitive Touch to Cooktops
Technical overview of capacitive touch for cooktops: CapTIvate implementation, design challenges, guard channels, assembly tolerances, false-touch prevention, and EMC.
Capacitive Touchscreen Specifications and Types
Technical overview of capacitive touchscreen specs and types, covering report rate, accuracy, sensitivity, projected/surface capacitive designs and evaluation criteria.
Four Common Touchscreen Repair Techniques
Practical touchscreen repair cases and troubleshooting guide covering diagnostics, backlight and circuit fixes, calibration issues, grounding and connector remedies
Advantages and Applications of Facial Recognition Visitor Systems
Overview of facial recognition visitor systems, their advantages in visitor registration and access control, applications in offices, hotels, banks, and privacy considerations.
Face Recognition Systems: Use Cases and Security Benefits
Face recognition visitor system for access control and automated attendance, logging identities, alerts, and event reconstruction for security.
Common Touchscreen Faults and Maintenance
Guide to touchscreen troubleshooting and maintenance for SAW, five-wire resistive and infrared types: causes, calibration steps, LED diagnostics and hardware checks.
Wireless Data Transmission for Fingerprint Handheld Devices
Technical design of a star-topology, master–slave wireless data transmission system using nRF905 to distribute and collect fingerprint authentication data from handheld devices.
Face Detection on NXP S32V Vision Platform
Implementation of real-time face detection on the NXP S32V vision platform: IMX224 capture, VSDK ISP flow, NCNN/OpenCV porting and Qt demo for ADAS driver monitoring.
What to Do When a Phone Touchscreen Fails in Winter
Practical troubleshooting for capacitive touchscreen unresponsiveness in cold conditions: causes, surface and software checks, and step-by-step fixes before repair.
Gaussian Filter: Principles and Implementation
Explanation of Gaussian filter, kernel generation and separable implementation in C++/OpenCV, with guidance on sigma selection and performance trade-offs.
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.
Improving 3D Recognition with 1D ToF in Smartphones
Technical article about electronics and hardware engineering.