On-Chip Color Filter

Color filter Array & Micro-Lens Array (On-chip Color Filters)

Color Filter Array (CFA), also known as On-chip color filter, is indispensable for CCD and CMOS image sensors as the image input elements and for small size display devices such as LCOS to provide color images.

Color filter of red, green and blue (RGB) as the primary colors of light or cyan, magenta, yellow and green (CMYG) as the complimentary colors is directly formed on each of the phototransistors generated on a silicon wafer.
In addition, the micro-lens array (MLA) is formed on CFA in order to enhance light gathering power of the image sensor and to improve sensitivity.





Structure of CFA and Effect of MLA



Technology development for high resolution, high pixel density

Toppan has been working at the forefront of the leading-edge technology development for high pixel density, such as improved light-harvesting property with optimal micro-lens shape, high resolution color resists and ultrafine resins.
Toppan is also developing spectral characteristics to address different customer expectations according to own needs.