Invisage Unveils 2MP NIR Sensor

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BusinessWire: Invisage announces SparkP2 sensor featuring global shutter, 3x higher light response in 940nm NIR band and over 20x lower power consumption than competing solutions. SparkP2 is a 1.1 um pixel, 2MP QuantumFilm sensor in 1/7-inch format for a less than 3mm thin z-height.

Talking about structured light 3D sensors, InVisage QuantumFilm global shutter works in tune with a pulsed LED, which optimizes the LED battery usage to be just 10 mW (versus 750 mW for LEDs used with rolling shutter NIR cameras). SparkP2’s fast global shutter allows the NIR light source to be pulsed for extremely short intervals instead of remaining continuously illuminated, thus overcoming sunlight while at the same time capturing movement more accurately and using far less net power.

SparkP2 is sampling in April 2016 with mass production scheduled by Summer 2016.

Brian O’Rourke, Senior Principal Analyst, Consumer Devices and MEMS & Sensors at IHS Technology, said in an email to VentureBeat, “There’s certainly opportunity here for InVisage. The types of use cases that they’re going after, such as facial and iris recognition, depth-mapping and eye and gesture tracking, have a wide variety of imaging applications, from security to online banking to gaming. These will all benefit from better performance in the IR range. These applications should grow significantly over the next few years, from a limited current base. The barrier for InVisage is the strong, established companies that they will be competing against in the image sensor market, companies like Sony, Samsung, OmniVision and ON Semiconductor. As a start-up, it’s extremely difficult to compete against companies that currently generate billions of dollars in revenue in your target market. You not only have to build a better mouse trap, but you have to be able to market it effectively.

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Hynix 1.12um Pixel Sensors

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Hynix has re-designed its CMOS sensor web site and made available flyers of many of its imaging products, including the newest 1.12um BSI-2 pixel, 13MP Hi-1332 mobile sensor:

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Hamamatsu Expands it Micro-Spectrometers Lineup

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Hamamatsu expands its CMOS sensors with a slit-based micro-spectrometers portfolio with the new C10988MA and C11708MA models:


With the addition of these new models, Hamamatsu micro-spectrometer lineup becomes even more impressive:

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LG Selects CEVA Imaging and Vision DSP for Mobile Devices

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PRNewswire: CEVA announces that LG has licensed the CEVA imaging and vision DSP for its mobile device products. "We are delighted to announce LG Electronics as a customer for our imaging and vision DSP," said Gideon Wertheizer, CEO of CEVA. "Their market leadership and stellar reputation for leading edge innovation in mobile enables them to fully leverage the capabilities of our DSP to add feature-rich, differentiated vision-based technologies to their mobile devices."

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ULIS Reports Strong Yearly Growth

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ALA-News: ULIS announces that the company experienced strong growth in 2015, with close to a 20% increase in volume sales over 2014. New customers in outdoor leisure equipment, continued sustainable growth in traditional markets, such as surveillance, thermography and defense, and several key contract wins drove the bulk of ULIS’ €48M ($52.3M) activity in 2015. ULIS’ unit sales climbed to 94,286 in 2015, up from 79,350 the previous year.

The pattern of ULIS’ volume sales performance appears to reflect market analyst forecasts of rapid growth within the uncooled infrared camera market, indicating +22% CAGR in units between 2015 – 2020,” said Dr Eric Mounier, senior technology and market analyst, MEMS & Sensors at Yole Développement.

We exceeded our objectives for 2015; gearing ULIS towards even higher prospects in 2016. I am very happy with my team and their dedication. I thank them for their drive and support,” said Jean-François Delepau, managing director of ULIS. “Our customer base also grew in 2015. The price/performance of our complete portfolio of Pico Gen2 products made a significant impact; they struck the right chord with camera makers and system developers across many market applications. In 2016, we will aim even higher to bring even greater product and service satisfaction to our customers.

ULIS is said to be the second largest producer of microbolometric thermal image sensors. Since its creation in 2002, the company has delivered 500,000 thermal sensors to equipment makers. Delepau is confident that the company’s growth rate will maintain the same pace for the next two years, then accelerate due to further penetration into new markets, such as smart buildings and automotive. “As early as January 2015, we saw initial signs that we would secure a high percentage of sales. This year, we have already begun seeing other positive indicators.

Currently, ULIS is close to going to market with its Pixel Level Packaging (PLP), which is at the industrial process stage. As the pioneer of the 17um pixel pitch thermal image sensor, the current industry standard, ULIS is pursuing development of its 12um pixel pitch thermal image sensors, which is nearing completion.

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Sony Announces 1.0um Pixel, 22.5MP Sensor with Integrated 3-axis Video Stab, HybridAF

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Sony announces the commercialization of IMX318 stacked image sensor for smartphones and other devices, a 1/2.6-inch, 22.5MP stacked CMOS sensor with the industry's first built-in high-speed hybrid autofocus (PDAF), as fast as 0.03s (and as fast as 0.017s when shooting video at 60fps), and built-in 3-axis EIS for video. Sony 4K video stabilization relies on the signal output obtained from the external 3-axis (pitch, yaw, and roll) gyro sensor and is said to consume low power. Sony's unique image stabilization technology incorporated into the IMX318 corrects not only camera shake, but also lens distortion. The sensor features Sony new 1.0um pixel. Sony aims to begin shipments for this new CMOS image sensor in May, 2016.


Sony publishes Youtube demos of 3-axis video stabilization and HybridAF of IMX318 "innovative CMOS image sensor" (video 1, video 2):



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EETimes: Imaging Revolution – Forget Frames

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EETimes: "Two French scientists, Ryad Benosman and Christoph Posch... founded Chronocam in 2014. They’ve developed an image sensor designed to capture images not based on artificially created frames, but driven by events within view.

“Each pixel individually controls its sampling – with no clock involved – by reacting to light, or changes in the amount of incident light it receives,” explained Posch, Chronocam’s CTO.

“Frame-based video acquisition is fundamentally flawed,” Chronocam CTO Posch decreed.

Chronocam has applied and tested its sensor’s principles in restoring people’s vision at Pixium Vision, a retina prosthetic company founded by Chronocam’s co-founders.

Chronocam has raised 1.5 million euro so far. Among investors are CEA Investment and Robert Bosch VC.

Chronocam’s CCMA ATIS 1.1 sensor, whose supply voltage is 3.3V (analog), 1.8V(digital), comes in a 9.9 x 8.2mm2 chip size, featuring 2/3-inch optical format. Its array size is 304 x 240 QVGA, with a pixel size of 30μm × 30μm. The power consumption is less than 10mW.

Asked about the company’s next steps, Verre, the CEO, said, “We aim at decreasing pixel pitch and increasing resolution. Our next steps are the VGA tape out and the migration to a CIS process.”

Chronocam is open to licensing its technology to others.
"

How Chrononcam's image sensor sees motions of hand (left)

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Imec Introduces Broad Spectrum Hyperspectral Imager

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Imec presents a new hyperspectral sensor with extended spectral range, going from the visible light (VIS) up to near infrared (NIR). The new line-scan VNIR (visible to near-infrared) sensor and snapshot mosaic VNIR camera outperform current solutions in spectral range and compactness.

Example applications for the line-scan sensor are machine vision and remote sensing applications, e .g. precision agriculture using UAVs and satellites. It features 140+bands in the 470-900nm range. Its small form factor is the result of extreme integration of the hyperspectral filter onto the CMOS sensor.

Working closely with two of our camera partners, VRmagic and Cubert Gmbh, we have realized one of the most advanced snapshot hyperspectral imaging cameras. It captures 40+ bands ranging from 450-875 m, at video-rate speed acquisition. This achievement clearly sets a new milestone for the real-time snapshot hyperspectral imaging camera market,” explains Jerome Baron, Business development manager integrated imaging at imec.

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ON Semi Image Sensor Business Update

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ON Semi reports its Q4 2015 and full year results. The image sensor group keeps increasing its share of the company business:


Few quotes from the company's earning call:

"Revenue for Image Sensor Group was approximately $184 million, down approximately three percent as compared to the third quarter.

Our momentum in CMOS image sensors for automotive application remained intact driven by steep adoption of ADAS and viewing cameras.

Though Aptina has been a key driver of our growth, especially in the automotive market, our performance on organic basis exceeded that of the industry in 2015.

We successfully integrated Aptina, and results from Aptina far exceeded our expectations and the guidance we provided to the investment community. We believe that we are in early stages of realizing full potential of our acquisition of Aptina. With Aptina, we believe that ON Semiconductor is among the best positioned companies to benefit from steep adoption of ADAS in automobiles.

In 2015, we significantly improved our market positon in security related imaging market with year over year revenue growth of 15%.
"

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IMEC Presents Lens-Free Microscope

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IMEC presents a lens-free microscope for large field-of-view live imaging at micrometer resolution. Its key benefits include super-large field-of-view at micrometer resolution and a compact and modular design. In a lens-free digital microscope, images are captured on a CMOS sensor, and digitally reconstructed using software. Imec’s lens-free microscope features a comparable micrometer-scale accuracy as traditional optical microscopes. While being much smaller and less expensive, imec’s microscope captures a larger field-of-view in one shot, enabling shorter sample processing times. The lens-free microscope paves the way to new applications with living cells and tissues.


Imec’s lens free imaging solution is now available as a full, ready-to-use demo kit evaluation system including a light source, image sensor, control and read-out electronics and a software interface,” stated Jerome Baron, business development manager of integrated vision systems at imec. “Companies can use it to try out their own applications, supported by our engineers to fine-tune the hardware and software and customize the systems toward their exact application requirements.

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Omnivision Samples RGB-Ir Sensor for Biometric Applications

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PRNewswire: OmniVision announces the OV2744, a 1.4um PureCel sensor featuring its second-generation RGB-Ir technology which delivers quality IR output without compromising RGB images. The OV2744 targets biometric applications such as facial recognition for front-facing cameras in notebooks, tablets and smartphones.

"Notebook and mobile device OEMs have traditionally relied on two-camera solutions for image capturing and facial recognition functionalities," said Arun Jayaseelan, product marketing manager at OmniVision. "The OV2744 is capable of delivering both premium RGB imaging and high quality IR information required for biometric and other emerging IR applications. The OV2744 thus gives OEMs the opportunity to move to single camera solutions, thereby reducing cost and space requirements for their devices."

The OV2744 is said to have less color aliasing than competing RGB-Ir sensors that are currently available in the market.

The OV2744 captures 1080p video at 60fps while consuming less power than any other 1080p sensor currently on the market. The 1/6-inch OV2744 supports full frame staggered high dynamic range and features an ultra-low power mode, which reduces the resolution and frame rates to conserve additional power.

The OV2744 is currently available for sampling and is expected to enter volume production in Q1 2016.

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Qualcomm Low-End AP Supports 16MP Camera

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Qualcomm announces its mid-range and low-end SnapDragon mobile processors: 625, 435, and 425. Even the lowest cost 425 model features dual ISP and 16MP imaging support:

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Brigates Publishes MCCD Datasheet

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Brigates publishes a fairly detailed datasheet of its BG0601D MCCD sensor:

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Read Noise: e- vs uV

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Albert Theuwissen reviews ISSCC 2016 Sensor Noise Forum and compares different ways of read noise reporting, based on Neale Dutton's presentation.

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ISSCC Review – Part 3

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Albert Theuwissen concludes his ISSCC review with NHK/Shizuoka Univ./Brookman 33MP, 1.1um pixel sensor for 8K UHDTV, and FBK SPAD imager that only reacts when a pre-set number of photons is registered by a pixel.

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Image Sensor Conference in Japan

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Technical Group on Information Sensing Technologies (IST), the Institute of Image Information and Television Engineers (ITE), holds an image sensor conference at NHK Lab facilities, Tokyo, Japan, on March 11, 2016. Participation is free of charge, no prior registration is required. The IST conference proceeding is about 1000-2000 yen. The agenda of the conference is full of interesting presentations:

  • Invited Talk: Low-Noise Image Sensors
    Shoji Kawahito (Shizuoka Univ.)
  • Multi-storied photodiode CMOS image sensor for multiband imaging with 3D technology
    Yoshiaki Takemoto, Kenji Kobayashi, Mitsuhiro Tsukimura, Naohiro Takazawa, Hideki Kato, Shunsuke Suzuki, Jun Aoki, Toru Kondo, Haruhisa Saito, Yuichi Gomi, Seisuke Matsuda, Yoshitaka Tadaki (Olympus)
  • A CMOS Image Sensor Using Multiple Tap Lateral-Electric-Field Charge Modulators for Time-of-Flight Range Imaging
    Taichi Kasugai, Sang-Man Han, Hanh Trang, Taishi Takasawa (Shizuoka Univ.), Satoshi Aoyama (Brookman Tech.), Keita Yasutomi, Keiichiro Kagawa, Shoji Kawahito (Shizuoka Univ.)
  • Stacked Image Sensor Using Chlorine-doped Crystalline Selenium Photoconversion Layer Composed of Size-controlled Polycrystalline Particles
    Shigeyuki Imura, Kazunori Miyakawa, Hiroshi Ohtake, Misao Kubota, Kenji Kikuchi (NHK), Toru Okino, Yutaka Hirose, Yoshihisa Kato (Panasonic), Nobukazu Teranishi (University of Hyogo)
  • A 1280x720 single-photon detecting image sensor with 100dB dynamic range using a sensitivity boosting technique
    Manabu Usuda, Yusuke Sakata, Seiji Yamahira, Shigetaka Kasuga, Mitsuyoshi Mori, Yutaka Hirose, Yoshihisa Kato, Tsuyoshi Tanaka (Panasonic AIS)
  • A 1.1μm 33Mpixel 240fps 3D-Stacked CMOS Image Sensor with 3-Stage Cyclic-Based Analog-to-Digital Converters
    Toshiki Arai, Toshio Yasue, Kazuya Kitamura, Hiroshi Shimamoto (NHK STRL), Tomohiko Kosugi, Sungwook Jun, Satoshi Aoyama (Brookman Technology), Ming-Chieh Hsu, Yuichiro Yamashita (TSMC), Hirofumi Sumi (The University of Tokyo), Shoji Kawahito (Shizuoka University)
  • Visualization of Ultra High-Speed Phenomena by 10 Mfps Ultra High-Speed Camera with Improved Photosensitivity of ISO 16000
    Manabu Suzuki, Masashi Suzuki, Fan Shao, Rihito Kuroda (Tohoku Univ.), Nobuyuki Tokuoka, Yasunori Kawaguchi, Hideki Tominaga (Shimadzu), Shigetoshi Sugawa (Tohoku Univ.)
  • An APS-H size 250Mpixel CMOS Image Sensor Using Column Signal ADCs with Dual Gain Amplifiers
    Takashi Muto, Hirofumi Totsuka, Toshiki Tsuboi, Daisuke Yoshida, Yasushi Matsuno, Masanobu Ohmura, Hidekazu Takahashi, Katsuhito Sakurai, Takeshi Ichikawa, Hiroshi Yuzurihara, Shunsuke Inoue (Canon)
  • A 1.2e- Temporal Noise 3D-Stacked CMOS Image Sensor with Comparator-Based Multiple Sampling PGA
    Kei Shiraishi, Yasuhiro Shinozuka, Tomonori Yamashita, Kazuhide Sugiura, Naoto Watanabe, Ryuta Okamoto, Tatsuji Ashitani, Masanori Furuta, Tetsuro Itakura (Toshiba)
  • An 18M-pixel CMOS Image Sensor Using 12-bit Column-Parallel Single-Slope ADCs with Operation-Period-Reduced Time-to-Digital Converters
    Yoshio Hagihara, Yusaku Koyama, Takanori Tanaka, Atsuko Kume, Yosuke Kusano, Mai Arita, Masashi Saito, Yoshihisa Okada (Olympus)
  • High-Speed Range Finding using Smart Image Sensor
    Daisuke Uehara, Makoto Ikeda (UTokyo)
  • CMOS Biosensor IC Focusing on Dielectric Relaxations of Biological Water with 120GHz and 60GHz Oscillator Arrays
    Takeshi Mitsunaka, Akira Saito, Nobuyuki Ashida, Kunihiko Iizuka (SHARP), Tetsuhito Suzuki, Yuichi Ogawa (Kyoto Univ.), Minoru Fujishima (Hiroshima Univ.)
  • Device Simulations for Ultrahigh-Speed and High-Voltage Image Sensors
    Hideki Mutoh (Link Research)
  • Color Image Sensor with Three-stacked Organic Photoconductive Films
    Toshikatsu Sakai, Hokuto Seo, Tomomi Takagi, Misao Kubota, Hiroshi Ohtake (NHK), Mamoru Furuta (Kochi Univ. of Tech.)
  • Organic-Photoconductive-Film CMOS Image Sensor -- 120dB Wide-Dynamic-Range,Photoelectric conversion controlled Global Shutter --
    Masashi Murakami, Kazuko Nishimura, Sanshirou Shishido, Masayuki Takase, Yasuo Miyake, Tokuhiko Tamaki, Yoshihiro Sato, Yasunori Inoue (Panasonic)

Thanks to RK for the info!

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2016 ISSCC Review, Part 2

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Albert Theuwissen publishes the second part of his ISSCC review. This part covers CMOSIS 391MP sensor and Canon 250MP APS-H imager, as well as Toshiba and TSMC papers.

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EVG Joins European Wafer Stacking Program

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EV Group (EVG) joins the 3D integration consortium of IRT Nanoelec headed by CEA-Leti and includes STMicro and Mentor Graphics to develop advanced 3D wafer-to-wafer bonding technologies. SET also joined recently the consortium.

Séverine Chéramy, director of the 3D integration program of IRT Nanoelec, said the consortium expects to achieve an interconnection pitch of about 1µm.

"Wafer-to-wafer stacking using direct Cu-to-Cu bonding is key for advanced 3D technologies, specifically for imaging application and 3D partitioning," Chéramy said. "EVG's knowledge on bonding will leverage the process expertise of the original members. The participation of EVG in the consortium will create new opportunities and optimized and cost-effective solutions for 3D IC devices."

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Albert Theuwissen Reviews Panasonic ISSCC Papers

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Albert Theuwissen publishes a review of Panasonic organic sensor papers presented at ISSCC 2016 this week. This is the first part of his ISSCC review.

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Himax Updates on its CIS Business

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Himax reports its Q4 and full fiscal 2015 year results. There are few updates on the company's image sensor business:

"CMOS image sensor business was the main factor behind the year-over year decline. As mentioned in our previous earnings call, our CMOS Image sensor business suffered becaucse we didn’t ramp our 8MP and 13MP sensors as planned due to the lack of Phase Detection Auto Focus (PDAF), a new but nowadays required feature for high end smartphone. We remained one of the market share leaders in notebook sector.

In terms of our 8MP and 13MP CMOS image sensors with PDAF feature, we are catching up fast. We believe we will be one of the few players capable of providing PDAF-equipped CMOS image sensors in the very near future. We will report progress in due course.
"

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Panasonic 123dB WDR Organic Sensor

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BusinessWire: Panasonic develops a new WDR technology which can improve simultaneous-capture DR 100 times wider than the conventional results, using a CMOS image sensor with an organic photoconductive film (OPF). The Dual-Sensitivity WDR Pixel Technology has two sensitivity detection cells in each pixel, taking advantage of a high-saturation performance and flexibility of a sensitivity setting of OPF CMOS image sensor, in order to achieve simultaneous-capture 123dB WDR. Capacitive-Coupled Noise Canceller Technology cancels pixel reset noise, in order to improve SNR of dark objects.

Panasonic holds 58 Japanese patents and 44 overseas patents (including pending) related to this technology.


Update: Nikkei publishes a 3-page article on this sensor.

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Panasonic 10x Higher Saturation Global Shutter Organic Sensor

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Businessire: Panasonic develops a new global shutter CMOS sensor using organic photoconductive film (OPF). The technology is said to enable capturing high speed moving object up to 10 times brighter scene in global shutter mode. In OPF CMOS image sensor, charge-storage function and photoelectric-conversion function can be set independently. Motion direction can be detected from acquired object's signal level in one picture by fine control of shutter sensitivity by changing applied voltage to OPF which is hardly realized by conventional CMOS image sensors.

The new technology has the following advantages:

1. Wide incident angle (60 degrees), high sensitivity, high saturation and highly-functional circuits due to a unique feature of OPF, in which an OPF for photoelectric-conversion and a readout circuits are independent.
2. High saturation signal up to 10 times larger than conventional image sensors with global shutter function due to Photoelectric Conversion Controlled Global Shutter Technology.

This development is based on the following new technologies:

1. CMOS Image Sensor Design Technology, in that, an OPF photoelectric-conversion part and a circuit part can be designed independently.
2. Photoelectric Conversion Controlled Global Shutter Technology that is realized by controlling of organic photoconductive film sensitivity.
3. Variable Sensitivity Multiple Exposure Technology which can detect the motion and its direction by changing image capturing sensitivity in each frame.

Panasonic holds 60 Japanese patents and 41 overseas patents (including pending) related to this technology.

Panasonic presented a part of the research at 2016 ISSCC.

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Panasonic APD-CMOS Sensor Sees Colors under 0.01 lux Illumination

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BusinessWire: Panasonic developed APD CMOS sensor with avalanche photodiodes (APDs) in each pixel. The in-pixel APDs multiply the photoelectrons by 10,000 times. This is said to allow getting sharp color images even under starlight (illuminance of 0.01 lux) or in other similarly dark places. Variable sensitivity technology in which multiplication is controlled in a thousandth of a second by controlling the voltage applied to the APDs, realizing 30-fps video imaging that can follow the changes in illuminance.

The new sensor has been presented on the 2016 ISSCC on February 1, 2016.

This development brings the following advantages:
  • Highly sensitive color imaging:
    40 million/lux・sec・μm2 (10,000 times sensitive in comparison to conventional devices)
  • Wide dynamic range:
    100 dB (+ 40 dB in comparison to conventional CMOS image sensors)

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Pixart Reports 2015 Results

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Pixart reports that its Q4 2015 revenue increased by 1.2% QoQ to NT$1,078.7 million. Due to unfavorable change in product mix, the gross margin decreased from 51.2% in previous quarter to 50.5% in 2015Q4. The revenue for 2015 was NT$4,320.2 million, decreased by 9.0% YoY.

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Panasonic Develops 100x More Sensitive Image Sensor

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Nikkei: Panasonic developed an image sensor 100 times more sensitive to light than an existing technology. The new sensing layer is made from an organic material film rather than silicon. Panasonic developed the basic technology with Fujifilm. A proprietary readout circuit reduces noise, while a modified electrode structure helps detect even faint light efficiently.

The company says the new sensor does not suffer from blooming, and is aimed to automotive applications.

Blooming demo, Panasonic sensor is on the right.

Possibly, the article material is based Panasonic presentation at ISSCC 2016. The company aims to have a practical version ready as early as 2020 or so.

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3D Camera Market Report

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PRNewswire: Allied Market Research publishes "World 3D Camera Market - Opportunities and Forecasts, 2014 - 2021" report.

"The global 3D camera market would garner revenue of $10.8 billion by 2021, registering a CAGR of 40.0% during 2016 - 2021. Professional 3D cameras would lead the market throughout the analysis period. The 3D cameras embedded in smartphones are expected to drive the 3D camera market significantly by 2021.

The 3D camera market is in its nascent stage; in 2015, it contributed to about 2-3% of the overall 3D technology market. However, its contribution to global markets, would increase significantly within the forthcoming decade. The market for 3D cameras is primarily driven by the requirement to record 3D content in media & entertainment applications. Other factors, driving the market growth include enhancement of 3D scanning technology, improved user preferences, increasing adoption of home automation applications and enhancement in virtual reality products.

Stereo vision is the largest revenue-generating technology segment of 3D camera market, which accounted for nearly 60% of the total market revenue in 2015. This segment is expected to maintain its dominance throughout the analysis period owing to its cost effectiveness and simplicity in implementation as compared to other technologies. However, time of flight technology is expected to grow at the highest CAGR of 44.6%, during the forecast period.

Among the key applications, professional 3D camera was the largest contributor, which accounted for around 65% share in 2015. However, the tablet applications would exhibit the highest CAGR of over the forecast period, owing to rising adoption of tablets as portable computing solutions.
"

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ESPROS Talks about ToF Imaging Challenges

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ESPROS Photonics' mailed me the Jan. 2016 Newsletter updating on the company's ToF business success and technical challenges:

"The ESPROS TOF technology is gaining huge momentum. The delivery start of the 3D-TOF QVGA imager was excellent. Customers immediately recognized the performance of our OHC15L technology. A QE of more than 80% at 850nm wavelength and pixels with 100% fill factor provide unmatched sensitivity with very low illumination power. A reference design of a camera engine with a horizontal FOV of 94° achieves a 10m range in the full field. Ok, this is on a white target. But the exposure time is a few milliseconds only."

Then, the newsletter shares the company experience dealing with temperature drift challenges:

"Several components of a TOF system are temperature sensitive: On the 3D TOF chip e.g. pixel-field, LED driver and the phase detector (DLL), etc.; on camera level e.g. the illumination (e.g. LEDs, VCSELs), illumination driver, connectors, IR filters, lenses, etc. Figure 1 shows the signal path with the contributors to temperature drift.


The main contribution comes from the pixel-field which is approx. 85% of the total distance drift by temperature (Figure 2).


The temperature drift in the pixel field is related on the one hand to the drift speed of electrons in solid which changes by temperature. It is a physical constant so it can be compensated by simple temperature measurement of the chip temperature. On the second hand, the drift speed is also related to the field strength in the photodetector. This field is
generated by the the backside voltage VBS. A simple rule says the higher the voltage the faster the electrons (Figure 3). However, there is a voltage limit where other effects start to become dominant. It is to note that a variation of VBS varies the measured distance. Thus, an accurate and constant VBS voltage is mandatory for accurate measurement.



Figure 4 shows a 2nd order fit for the compensation of the temperature drift in the pixel field."

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Thesis on Time-Resolved CMOS Sensors with Draining-Only Modulation Pixels

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Shuzuoka University publishes an 2013 PhD thesis "A Study on Time-Resolved CMOS Image Sensors with Draining-Only Modulation Pixels for Fluorescence Lifetime Imaging Microscopy" by Zhuo Li. The pixel concept is shown below:

Concept of two-stage charge transfer pixel and draining only
modulation (DOM) pixel.
DOM pixel layout
Photo charge modulation and sequential readout in the
DOM pixel

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Pixium Vision Reports Retinal Implant Business Success

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BusinessWire: Pixium Vision says it is the only company in the world to develop in parallel two distinct retinal bionic implant platforms. IRIS II, the company’s first system, targeting retinitis pigmentosa, and PRIMA, the second generation miniaturized wireless implant, better suited for Age Related Macular Degeneration (AMD) will allow the company to address an estimated market of more than 4 million patients in Europe and North America.

Over the last quarter of 2015, the company made significant progress on IRIS II, its epi-retinal bionic system equipped with an asynchronous bioinspired image sensor. IRIS II is said to be the first epi-retinal device to be equipped with 150 electrodes worldwide. In December 2015, the company received the approval from the French regulatory authority ANSM to initiate clinical study for patients who have lost sight due to retinitis pigmentosa. The company has also received the Austrian approval. Further national approvals are expected in the coming months.

In early 2016, the company announced positive preclinical safety and feasibility data for PRIMA, its second generation bionic system. Stanford University, demonstrated thermal safety of near infrared stimulation of PRIMA in a well-established animal model for retinal damage assessment in laser treatment.

A Vimeo video explains the company's technology"



Pixium IRIS implant
Pixium PRIMA implant

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Sony A7s Mark II review – the low-light monster returns!

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Sony's Alpha A7s Mark II is a full-frame mirrorless camera that specializes in 4k video and low light shooting. The A7s II takes the 12 Megapixel full-frame sensor of the original A7s and fits it into the updated body of the A7r Mark II. So it inherits the improved viewfinder, built-in stabilisation, chunkier grip and repositioned controls, and, most importantly, internal 4k recording. The big question is whether to go for the A7s II or the A7r II, so I've made a number of photo, 4k video, burst shooting and autofocus comparisons to help you choose the right model! It's all in my in-depth Sony A7s II review!

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