3D Image Sensors Bring Virtual Reality to Smartphones

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New 3D image sensor chips from Infineon and pmdtechnologies are said to allow mobile devices quickly and realistically detect their surroundings in three dimensions. REAL3 will enable extremely realistic virtual and augmented reality game experiences that involve the interaction of the gamer’s own hands and his living environment within the game via head-mounted devices. Other image sensor chip applications include the spatial measurement of rooms and objects, indoor navigation and the implementation of special photo effects.

Compared to the previous version, the optical sensitivity as well as the power consumption of the new 3D image sensors has been improved. Moreover, the built-in electronics take up little space. The chips make it possible for cell phones to operate mini-camera systems that can measure 3D depth data. Infineon and pmd plan to showcase the latest 3D image sensor chip of the REAL3 family at the Consumer Electronics Show (CES) 2016 in Las Vegas.

The optical pixel sensitivity of the new 3D image sensor chips are now double that of the previous version. This means that their measurement quality is just as good, while at the same time working with only half of the emitted light output. Thus, manufacturers of camera systems for mobile devices can not only provide the infrared lighting more cost-effectively, but the camera’s system power consumption is almost halved.

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By applying microlenses to each of the pixels of the 3D image sensor chip, the optical pixel sensitivity is improved. Consequently most of the incident light is directed to a pixel’s sensitive surface, so virtually no light energy is lost to the inactive areas anymore.

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With an optimised form factor, the 3D image sensor chips were specifically designed for mobile devices, where most applications only need a resolution of 38,000 pixels. The previous 100,000 pixel matrix was accordingly scaled down, and other functional blocks, such as the analog/digital converter for the chip area and performance range were optimized. Thus, the system costs are lower and the sensor chip area is almost halved, and, because of the lower resolution, smaller and less expensive optical lenses can be used.

Equipped with microlenses and with almost the same level of optical performance and functionality, the three new REAL3 3D image sensor chips differ only in their resolutions: the IRS1125C works with 352 x 288 pixels, the IRS1645C with 224 x 172 pixels and the IRS1615C with 160 x 120 pixels. In this respect, the IRS1645C and IRS1615C are produced on half the chip area of the IRS1125C.

Infineon and pmdtechnologies are joint partners in Google’s ‘Project Tango’ which uses IRS1645C 3D chip. In this project, cell phones and tablets are equipped with a special optical sensor system for 3D perception, which includes a 3D camera with Infineon’s IRS1645C 3D image sensor chip.

Applications are augmented reality, indoor navigation and three-dimensional measurement. The complete 3D camera for Google ‘Tango’, consisting of IRS1645C and an active infrared laser illumination, is housed in an area of approximately 10mm x 20mm. With a range up to 4 meters (13 feet), a measuring accuracy of 1 percent of the distance and a frame rate of 5fps (frames per second), the 3D camera subsystem consumes less than 300 mW in active mode.

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The IRS1125C will be available in volume as of first quarter of 2016. The start of production for the smaller IRS1645C and IRS1615C is planned for the second quarter of 2016.

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