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Sony 3 Layer Sensor for Smartphones

three later sensor

Well Sony announced three layer Stacked CMOS sensor for smartphones. The sensor is capable to record superslow motion movies upto 960fps.

Sony R&D Dep pushing technology to a next level by adding alien tech inside the small smartphones. Imagine a Smartphone that that captures 960fps video on the go.

The Changes Made: Till now Sony was developing 2 layer sensor for smartphones a while ago that consist of stacked CMOS image sensor with a layer of back-illuminated structure pixels and a chip affixed with mounted circuits for signal processing.

But Now a new DRAM layer added to the conventional 2 layer sensor making it 6X more faster than conventional sensors.

The Major Advantage you get is you can record Full HD video at 60fps and that’s truly amazing.

Camera using three layer stacked sensor: Sony RX10II, Sony RX100 IV and Sony RX100 V also features DRAM tech based sensor with HFR (High Frame Rate).

Press Release

Tokyo, Japan—Sony Corporation today announced the development of the industry’s first*1 3-layer stacked CMOS image sensor with DRAM for smartphones. The new image sensor consists of a DRAM layer added to the conventional 2-layer stacked CMOS image sensor with a layer of back-illuminated structure pixels and a chip affixed with mounted circuits for signal processing.

This newly developed sensor with DRAM delivers fast data readout speeds, making it possible to capture still images of fast-moving subjects with minimal focal plane distortion*2 as well as super slow motion movies at up to 1,000 frames per second (approximately 8x faster than conventional products*3) in full HD (1920×1080 pixels).

In order to realize the high-speed readout, the circuit used to convert the analog video signal from pixels to a digital signal has been doubled from a 2-tier construction to a 4-tier construction in order to improve processing ability. Although there are speed limitations in the interface specifications for outputting signals from image sensors to other LSIs, this sensor uses DRAM to store signals read at high speed temporarily, enabling data to be output at an optimal speed for the standard specifications. As a result, the product is capable of reading one still image of 19.3 million pixels in only 1/120 of a second (approximately 4x faster than conventional products*3), thereby supporting high-speed image capture.

The newly developed sensor also includes solutions for the various technical problems inherent in the design, for instance, reducing the noise generated between the circuits on each of the three layers. Sony has made the most of the expertise in stacked image sensor manufacturing technology, which it pioneered and developed over the years, to ensure that quality and reliability remains high despite the complex three-layered construction.

These development results were announced at the International Solid-State Circuits Conference (ISSCC) which started on Sunday, February 5, 2017 in San Francisco.

Main Features

  1. Industry’s first*13-layer stacked configuration with DRAM delivers high-speed readout of 19.3 million pixel image in only 1/120 second

With the stacked high-speed, low power consumption, high-capacity DRAM, the new sensor can read one still image of 19.3 million pixels in only 1/120 second (approximately 4x faster than conventional products*3), reducing the time lapse for reading each pixel line. This technology minimizes the focal plane distortion*2 in still images that tends to occur when shooting fast-moving subjects on smartphones, which lack a mechanical shutter for controlling exposure time.

  1. Supports shooting of super slow motion movies with a maximum frame rate of 1,000 fps in full HD (1920×1080 pixels)

The high-speed readout capability makes it possible to record up to 1,000 fps (approximately 8x faster than conventional products*3) super slow motion movies in full HD (1920×1080 pixels). Normal speed shooting data and maximum 1,000 fps high-speed shooting data stored on the DRAM are exported from the image sensor for signal processing on an external image signal processor (hereafter referred to as ISP), making it possible to record vibrant movies on a smartphone that seamlessly combine normal speed movies and super slow motion movies. To ensure that users don’t miss split-second moments in super slow motion movies, it is possible to adjust settings so that sudden subject movement is automatically detected and high-speed shooting begins. Because high-speed shooting data is stored on the DRAM and output at a normal speed, a conventional ISP can be used.

Key Specifications

Effective pixel count 5520 (H) x 3840 (V) 21.2 megapixels
Image size Diagonal 7.73mm (Type 1/2.3)
Unit cell size 1.22μm (H) x 1.22μm (V)
Frame rate Still images

30fps

4:3 19.3 megapixels / 16:9 17.1 megapixels

Movies

60fps

4K (3840 x 2160)

240fps

Full HD / 720p

Reading speed 8.478 ms (4:3 19.3 megapixels) / 6.962 ms (16:9 17.1 megapixels)
Power supply 2.5V / 1.8V / 1.1V
Image format Bayer RAW
Output MIPI (CSI2) D-PHY 2.2Gbps/lane / C-PHY 2.0Gsps/lane
DRAM capacity 1G bit

1 comment to Sony 3 Layer Sensor for Smartphones

  • stella

    Why Sony is calling three layer sensor ? piratically yes it is a three layer sensor in which we have one layer sensor and other two layer of tech stacked and compressed against each other.

    But if you want to see a multiplayer sensor for a reason then you can look for Sigma Foveon three layer sensors.

    BTW, it’s a great news for smartphone users.

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