Sumitomo Chemical Company, Limited

Tuyoshi Tokuda

Tsutomu Watanabe

Jun-Ichi Yasukawa

Toshiaki Ota

Color layers of a color filter obtained by exposing a transparent substrate to light from the back side followed by development may have a defect of layer unflatness produced due to unevenness caused by contamination with foreign matters. The defect can be repaired by eliminating the defective part of the color layers to produce a blank there, optionally filling the blank with a negative photosensitive composition containing a black colorant and returning the thus modified color filter to an appropriate step in the production line. The color filter repaired is used to fablicate multi-color display devices which are by no means inferior in display qualities to those fablicated using a color filter having no defect originally.

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Yachiyo, Japan

Tuyoshi Tokuda