Camera: CIS Color Filter and Micro Lens Array Explained by VisEra

Color Filter and Micro Lens Array

CMOS Image Sensor (CIS) is an imaging device that performs the role of an electronic film in digital photography equipments. VisEra’s CIS products are used in a broad range of areas including digital cameras, camera phone, web-camera, notebook security devices, automobile, and miniature imaging devices used in medical applications. Image quality and competitive cost structure are keys to success in the image sensor market. To achieve high levels of image quality, our color filter and micro lens processes provide wide dynamic range and high sensibility. Current leading-edge devices use 1.4μm size pixels with ongoing development even smaller sizes such as 1.1μm and 0.9μm pixels. With an established manufacturing facility capable of running multi-chip technology modules at high volume and our mature supply chain, VisEra is able to offer highest levels of manufacturing flexibility and cost structure.

Image Sensor Structure

CMOS Image Sensor, Pixel, Cell

Formation of Color Filter

Principle of Micro Lens & Color Filter Spectrum

Color Filter & Micro-lens Technology

VisEra dedicates on developing wafer level image sensor (CMOS Image Sensor) by combining semiconductor process and optical image design & process technologies. To compare the benefits with traditional CCD Sensor, CMOS Image Sensor has more advantages in low cost, low power consumption, direct read-out capability of images and integrated camera functions in single chip.

CIS technology focuses on two portions: Color Filter (CF) and Microlens (ML.) Color filter dominates the color accuracy of sensor and micro-lens improves the sensitivity of sensor. The technologies are indispensable in obtaining the image sensing quality. Both could be applied in traditional Front Side Illumination (FSI) and more advanced Back Side Illumination (BSI.).

CIS CF/ML process brief flow

Color Filter Array example patterns and optional color pixels

Micro Lens mask design

a)Non-Reflow Type

b)Reflow Type

c)Etching Type

Examples of Micro Lens types and shapes

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