Patent ID: 8144080

Claim:
A face panel for a color image display apparatus comprising a transparent substrate, a plurality of phosphor layers disposed on the transparent substrate for emitting different color lights, and a plurality of transmittance adjustment layers interposed between the transparent substrate and the plurality of phosphor layers in correspondence to the plurality of phosphor layers, respectively, for adjusting the transmittances of the lights emitted from the plurality of phosphor layers, wherein, −0.01 <pX /( pX+pY+pZ )− xw< 0.01, and −0.015 <pY /( pX+pY+pZ )− yw< 0.015 are satisfied, when tristimulus values of emitted lights of red (R), green (G), and blue (B) phosphors are shown by R: (RX, RY, RZ), G: (GX, GY, GZ), B: (BX, BY, BZ), respectively, tristimulus values of the transmittances of the plurality of transmittance adjustment layers corresponding to the red (R), green (G), and blue (B) phosphors are shown by R:(Trx, Try, Trz), G:(Tgx, Tgy, Tgz), B:(Tbx, Tby, Tbz), respectively, a chromaticity coordinate of white light is shown by (xw, yw), and pX=RX×Trx+GX×Tgx+BX×Tbx pY=RY×Try+GY×Tgy+BY×Tby pZ=RZ×Trz+GZ×Tgz+BZ×Tbz are established, and wherein the transmittance adjustment layer has a filtering function having an approximately constant transmittance in the visible light wavelength region.