ASPDAC 2010 has Tohoku University's paper on WRGB LOFIC sensor:
Checkered White-RGB Color LOFIC CMOS Image Sensor
Shun Kawada, Shin Sakai, Yoshiaki Tashiro and Shigetoshi Sugawa
Tohoku University, Japan
WRGB pattern is said to improve sensitivity by a factor two as compared with RGB sensor. Here is the pixel and color filter layout:

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