The anti-reflection film has reflectance minimums in at least prime colors. The reflective display medium has the reflectance minimums in at least the prime colors. The light emitting display medium has the reflectance minimums in at least the prime colors, and having light emission maximums in the prime colors. The organic EL device has the light emission maximums in the prime colors. The liquid crystal monitor has the reflectance minimums in at least the prime colors, and uses as a supplemental light source the organic EL device.