According to James Consulting, OmniVision Technologies (hereinafter referred to as OmniVision) Nyxel's NIR technology significantly improves the camera's response to low light conditions. Typically, camera sensors can be used in low light conditions, but the response of the sensor in the 850 nm and 940 nm wavelength range is lower than visible light (as shown in Figure 1). Part of the reason for this is that the sensor typically captures incident photons that are perpendicular to the sensor. If the depth of the sensor is increased, the incident light can be better detected, but this can cause problems such as crosstalk.
Figure 1: A typical camera sensor captures photons directly through the sensor. The 850nm and 940nm wavelength ranges are typical infrared-assisted illumination sources.
Nyxel technology uses three technical means to solve this problem. First, it is to increase the thickness of the silicon so that photons can travel farther in the pixel, allowing more photons to be converted to electrons, resulting in a brighter image. Secondly, each pixel is placed in a trench with a barrier between pixels to prevent photons from propagating to adjacent pixels to prevent crosstalk (as shown in Figure 2). Third, it is to add an absorption layer that absorbs the maximum amount of light on the surface. The combination of these three technologies provides a longer photon propagation path that allows the sensor to detect more photons and improve overall system performance. In addition, the Nyxel technology's blessing will neither reduce the sensor's sensing performance to visible light nor reduce the frame rate of visible or infrared sensing.
Figure 2: Nyxel technology significantly improves sensor performance at 850 nm and at 940 nm by adding a barrier and absorbing layer that disperses incident photons around each pixel.
The performance of the new sensor using Nyxel technology highlights the performance improvement of the Nyxel technology at 850 nm and 940 nm, with a 3-fold increase in wavelength at 850 nm (60% quantum efficiency) and 940 nm (40% quantum) Efficiency) has increased by 5 times. These two wavelengths are the most commonly used near-infrared LED sources and are outside the visible range.
The effect of Nyxel technology is evident when using existing sensors and new sensors using Nyxel technology (see Figure 3). Cameras using Nyxel technology provide a brighter picture with higher contrast for richer detail.
Figure 3: Seeing is believing - on the left is the imaging of the standard OmniVision camera, and on the right is the imaging with the same sensor as the Nyxel technology
The near-infrared (NIR) sensitivity enhancement is beneficial for a variety of applications. For example, it can extend the battery life of mobile applications that require infrared illuminators to increase camera efficiency. With high sensitivity, it provides farther image capture. Similarly, it provides clearer, more vivid images in low or no ambient light compared to sensors without Nyxel technology.
Nyxel technology can be applied to the entire detector chip and is therefore expected to be applied to OmniVision's entire line of image sensors . Currently, Nyxel technology will be used primarily to provide several cameras with resolution and frame rate performance options.
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