Sony announced on June 5 that they have successfully developed back-illuminated ToF time-of-flight image sensors with a minimum pixel pitch of 10μm. As early as 2015, Sony acquired Softkinetic Systems SA ("Softkinetic"), a ToF image sensor technology development company, and attempted to combine its own back-illuminated CMOS image sensor technology with "ToF."
ToF technology measures the distance between the sensor and the object by the time it takes for the light source to reach the object and reflect it back to the sensor. The ToF image sensor detects the distance information for each pixel, resulting in a high-precision depth map. The accuracy can be further improved by ensuring that the reflected light is efficiently received and the processing required to measure the distance is performed at a high frame rate. In addition, power consumption can be reduced by effectively collecting and processing the reflected light.
At the core of Sony's new ToF technology is Softkinetic's proprietary Current Assisted Photo Modem ("CAPD"), which uses a unique pixel architecture that utilizes the drift current in the pixel for high-speed modulation to improve detection of optical signals Accuracy. This method increases the accuracy of measuring the horizontal distance of each pixel, enabling accurate measurements and depth map acquisition even at considerable distances.
Sony combined CAPD with its back-illuminated CMOS image sensor pixel technology to create the industry's smallest new backside ToF image sensor with 10μm pixel pitch. The new sensor is based on the advantages of a backlit pixel structure that stratifies the circuitry under the photodetector. By optimizing the pixel structure and circuitry of the CAPD, the new Sony product enhances light harvesting efficiency and enables high-speed distance measurement.
In recent years, there has been a growing demand for more accurate depth sensing, especially in augmented reality (AR), virtual reality (VR), and other applications such as robots and drones that require autonomous operation. This new sensor is part of the DepthSense line-up that makes gestures and object recognition and obstacle detection possible. The new sensor will help extend the reach of ToF image sensors by providing high-precision depth sensing in a compact, low-power, compact package.
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