A search technology generates recommendations with minimal user data and participation, and provides better interpretation of user data, such as popularity, thus obtaining breadth and quality in recommendations. Partial filters 301-30N obtained by dividing number of matched filter taps by N are provided with a controller 341 for controlling which partial filters are enabled. The resulting front substrate enhances at least one of color temperature, color purity, or contrast of the PDP without increasing complexity or cost. The phosphors include those activated by cerium. While being able to read a detectable object image adequately, the image display can be performed satisfactorily.