LIGHT SOURCE BRIGHTNESS DETERMINING METHOD AND LIGHT SOURCE LIGHT EMITTING METHOD OF DISPLAY DEVICE, AND THE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To facilitate visual recognition of display of a display device by a light source without changing color with respect to an object person such as an elderly person and dyschromatopsia person. SOLUTION: (A) The value corresponding to the ratio between standard visibility ILuand visibility ILu_oof the object person is determined when it is assumed that the wavelength of light is λ, the spectral radiant intensity of the light source 34 expressed by a function of the wavelength λ is I(λ), the spectral luminous efficiency of the object person expressed by a function of the wavelength λ is Vo(λ), the spectral luminous efficiency as a standard expressed by a function of the wavelength λ is V(λ), the luminous efficacy at the wavelength where the spectral luminous efficiency V(λ) as the standard is maximum is km, the luminous efficacy at the wavelength where the spectral luminous efficiency Vo(λ) of the object person is maximum is km_o, the wavelength on the short wavelength side of visible radiation is λS, and the wavelength on the long wavelength side of visible radiation is λL. (B) Based on the determined value, the brightness changed in response to the ratio ILu/ILu_oof ILuto ILu_owith reference to the standard brightness is determined as the brightness of the light source 34 of the display device 2. COPYRIGHT: (C)2011,JPO&INPIT