Applied technology of “dispersion” Resist for color filter

color filter resist (hereinafter referred to as color resist) is an ink based on colorants used in color filter for displays and other devices. Coloring materials (pigments /dyes) are mixed with resins, photosensitizers, solvents, etc. In negative color resist, the coating film in the irradiated areas is cured by irradiation with UV light, and a fine pattern is formed through the development process. Can be formed. Depending on the application, patterning is possible from several tens of micrometers to less than 1 micrometer.

Additionally, color filter are required to have high light transmittance. In order to reduce scattered light, it is essential to have a technology that reduces pigments to nano-sized particles and disperses them uniformly. By applying special processing to the surface of pigments particles, our group is able to uniformly disperse and stabilize ultra-fine pigments in liquid without agglomerating them.

We are working on the development of new colorants to make images brighter and more vivid. OPTLION ™ GREEN, developed by the Group, improves transmittance around 550 nm compared to conventional colorants, enabling brighter color expression.

An image sensor is a semiconductor that converts incident light collected by a camera lens into electrical signals. color filter have the function of separating the colors of the light that enters the image sensor, and are important components that provide color information to images. Our group develops color resist for image sensors used in digital cameras and smartphone camera functions.
Since the size per pixel is significantly smaller than that of a display, patterning technology that supports even higher definition is required.

We are developing materials that transmit near-infrared light (NIR), which are used in applications such as self-driving cars, biometric authentication, and surveillance cameras, which are being developed around the world. This material has a high transmittance of 90% or more for light in the near-infrared region, and can cut the transmittance of visible light to 1% or less.