Time-of-flight device using two light modulation frequencies and operating method thereof
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United States of America
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Jan 28, 2025
Grant Date -
Sep 14, 2023
app pub date -
May 17, 2023
filing date -
May 17, 2023
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Abstract
There is provided a distance measurement device including a light source, a light detector, a time control circuit and a processor. In first measurement, the time control circuit controls the light source to illuminate at a low modulation frequency, and the processor calculates a rough flying time according to a first detection signal of the light detector to determine an operating phase zone and a delay time. In second measurement, the time control circuit controls the light source to illuminate at a high modulation frequency and causes a light driving signal of the light source and a detecting control signal of the light detector to have a difference of the delay time, and the processor calculates a fine flying time according to a second detection signal of the light detector.
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