COLOR PURITY IMPROVEMENT SHEET, OPTICAL DEVICE, IMAGE DISPLAY DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an excellently useful color purity improvement sheet capable of efficiently using light having improved color purity to an image display device while preventing occurrence of uneven color and uneven brightness and improving color reproducibility of the image display device.

SOLUTION: The color purity improvement sheet has a light emitting layer including a light emitting means for improving the purity of color in a desired wavelength range by absorbing light in a specific wavelength range except for the desired wavelength range, converting the wavelength and emitting the light in the desired wavelength range. The surface of the light emitting layer at least in the out-going light side is surface-roughened to be 0.1-100 μm arithmetic average surface roughness regulated by JIS B 0601 (1994 version).

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