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By ihenry March 15, 2014 1 Comment

ISOCELL not just a commercial of Samsung , which is an innovative imaging technology , which helps reduce cross noise between the light-sensitive wells in a pixel , increasing the actual color and sharpness compared with BSI sensor information often, promising higher image quality and / or size clusters more compact camera .


Androidauthority long article explaining the technology and applications of ISOCELL , you should challenge yourself ready for a cup of coffee or a cup of tea and slowly read.


Megapixel results are a number of easy to over together again , which is why so many manufacturers like to brag about it , as if to push MP panacea for all the problems of the power of photography phone . However there are many other important factors contributing sensor to create a high quality image , not just megapixels , it is important to note that when we talk about ISOCELL .


ISOCELL – Technology enhances image quality – App for mobile devices


Fans cameras may have heard about Samsung’s imaging sensor ISOCELL named , is said to have appeared in the Galaxy S5 . This new technology promises to increase light sensitivity and color fidelity than even in low light conditions , and Samsung will adopt it as the next step to improve the technology of sensor technology Backside – illuminated ( BSI – put the power cord back) .


Then we will hear more about ISOCELL technology in the next few months . ISOCELL not just rhetoric would therefore be useful to know what the technology is and how it works . This article uses information from a lecture on new technologies that we attend , we will take a closer look at the Samsung want to change things like camera smartphone .


One of the most important factors deciding the overall quality of an image sensor is the amount of light that it can be captured at each pixel ( pixel ) . This is a very simple premise – as much of the light from the scene that the sensor captures the image has been accurately reproduced . This means that each pixel size bigger benefit for image quality , because each pixel can receive more light .


However, when you have large pixel , the number of pixels on a photosensitive plate area could not more , and not much smaller resolution and less detailed images .


Often the phone manufacturers to pay more attention to insert as many pixels to increase resolution instead created more light-sensitive pixels .


A notable exception is HTC , the company with its technology UltraPixel tried to go against the trend shrink the pixel locking . UltraPixels fact that basic pixels large , and that’s why HTC had to reduce the resolution of your camera to just HTC ONE 4MP . One positive that can be said is beautifully captured in low light conditions while other machines to ” gong ” .


However, firms are not always willing to follow the path of HTC , so the sensor manufacturer has poured billions of dollars into the development of sensor has high resolution just to have good sensitivity for difficult to meet the requirements of the smartphone .


In an effort to catch good light even on very small pixels , the manufacturer has very long strides to improve the efficiency of the sensor , from removing gaps between pixels to move the wire electrical connections pixels down below to not obstruct light comes on ( BSI ) . The illustration below shows the BSI sensors capture more photons ( photon ) , than FSI sensor wires a bit entangled .


However BSI technology to maximize this has sensors and performance . A major obstacle affecting the image quality is diagonal noise ( crosstalk ) , and this is where the use of martial ISOCELL .


ISOCELL solve problems ?


When the pixel dimensions become smaller , then the photoelectric diode ( photodiode ) starts to feel not real accurate color and light output due to a phenomenon known as cross noise . ( Photovoltaic diode summary tasks each light particle and converted into electrical current , then the processor will process the current image )


Noise cross occurs when a light is supposed to get into the photodiode to ” leak ” through neighboring photodiode , causing a weak electrical current in a place that should not be .


There are several causes of noise cross , which is the most common cause of light reflected back and forth around the turn of the diode , known as optical noise ( light crosstalk ) . Also, when a pixel receives light more than likely it can handle (light spills over saturation ) , the noise power occurs ( electronic crosstalk ) , which is the current generated in the wrong destination due to diode leakage power data transmission signal from the diode


Try taking a practical example : the only green spectral projection on a certain pixel , then outside to get into the green diodes , a photon can leak into the diode blue and red and cause a small electric current in the diode color , despite the fact that no red or blue in the face that scene . As you can imagine , this leads to a slight aberration , can bulge out too much and bloom color . Noise cross is not necessarily excluded , but can be mitigated by a number of clever techniques .


ISOCELL activities like?


ISOCELL basically an improvement of existing technologies and aims to solve the above problems . ISOCELL handle the problem of cross-contamination by using physical barriers isolating the wells began in the morning, so we see from ISO – means isolating isolation . These barriers help photons caught in the wells for them and be absorbed by the photodiode corresponds rather well to jump into the next game .


This is a video that explains Samsung ISOCELL :



Compared with the conventional pixel BSI , ISOCELL expected to reduce cross noise and enhance the capacity of the light-sensitive wells approximately 30 percent . This does not mean that the image quality will be improved 30 percent , but it’s clear that the color will be higher , will be recognized by the sharpness and excellent profit improved slightly .




ISOCELL is also the name trade name of Samsung ‘s digital 3D – Pixel Backside Illuminated with Front- Side Deep – Trench Isolation ( DTI – F – ) and Vertical Transfer Gate ( BSI Pixel with 3 – D deep trench technology set in communication port on the front and vertical)


The problem arises when applying F – DTI barrier itself is causing the loss of surface area of the light-sensitive photodiode served , and affect the ability to capture maximum light wells . To solve this problem , Samsung changed the design of the diode using a component called vertical transmission gate ( VTG ) , rather than the level normally found on the BSI sensor . The use Samsung VTG help separate the light-sensitive diode , but well maintained and have been catching large bright good sensitivity .


Thanks to this technology , Samsung has reduced noise cross- BSI from 19 percent of normal to 12.5 percent in ISOCELL . New Technology for rate signal light / noise ( YSNR = 10 ) at 105 lux , compared with 150 lux if BSI generally used , the maximum capacity of the well begins 6,200 e – light are also compared with a 5000 e – on experience BSI similar variables .



  1. Thanks for share ! useful for everyone. :)

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