Jianjun Guo

Title: Jianjun Guo and Ambient Flicker Detection

Introduction

Jianjun Guo is an inventor based in San Jose, California, whose patent work includes technology for detecting flicker in ambient light. His listed patent is associated with Apple Inc. and describes methods and circuits for measuring flicker in electronic devices.

Latest Patents

Guo is credited with 1 patent: “Electronic Devices with Ambient Flicker Detection.” The invention describes an electronic device equipped with a sensor that measures ambient flicker. One approach uses a sigma-delta converter, with flicker calculated from its voltage output and the number of times it is triggered during a predetermined period.

The patent also describes applying a fast Fourier transform to these measurements. Filtering or non-uniform sampling may help avoid aliasing, while Lomb–Scargle spectral analysis may help prevent attenuation of measured flicker signals. Alternative implementations include a folding capacitive transimpedance amplifier circuit or a circuit combining an analog-to-digital converter with a digital filter.

Career Highlights

The patent reflects work on sensing and signal-processing techniques for electronic devices. By offering multiple circuit and analysis approaches, the invention addresses the measurement of ambient light flicker under different implementation conditions.

Collaborations

Guo’s listed coworkers include Anand K. Chamakura and Stephen N. Sweet. The patent is associated with Apple Inc.

Conclusion

Jianjun Guo’s patent documents a range of approaches to ambient flicker detection, combining sensor circuitry and signal analysis to support measurement in electronic devices.