The present disclosure relates to a position determination system and related method for accurately and rapidly capturing the position of an input device (e.g., a stylus). The position determination system can include an input device such as a writing instrument that includes a light emitting diode (LED) that can be detected by two or more position sensing diodes. The position sensing diodes (PSDs) can generate a bias voltage proportional to the position of a point (e.g., a brightest point) of light incident to the surface of the PSDs. As a result, based on the position of the LEDs relative to the PSDs, the position of the input device can be determined based on the magnitude of the voltage generated by the PSDs. The PSDs can transmit signals including information associated with the voltage to a computing device that can process the signals and generate an output for an output device.
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N/A, "Location of Writing Instruments Using Position Sensing Diodes in Stereo Configuration", Technical Disclosure Commons, (December 13, 2017)