Chemically Modified Carbon Black for the Resin Black Matrix in LCD Color Filters

摘要

The IPS mode of LCD requires a black matrix (BM) layer with high resistivity. Traditional Cr-based materials do not provide the required electrical properties and are harmful to the environment. Current resin based offerings have difficulty providing resistivity and opacity in a 1 μm film. We developed a method to produce dispersions of chemically modified carbon blacks (CB) which deliver volume resistivities in resin BM films suitable for IPS mode and other wide viewing angle technologies. The material also meets opacity requirements in 1 μm films. This BM material might also be used directly on the TFT layer.