| 摘要 |
<p>The disclosed surface light source device (20) is a plurality of two-dimensionally arrayed light sources, wherein each of said plurality of light sources is a point light source. The light source device (20) is provided with said plurality of light sources (31), and a light diffusion plate (40) that diffuses the light from the plurality of light sources (31). In the surface light source device (20), the light distribution I(?) of the individual light sources (31) of the plurality of light sources fulfils the formula below. I(?) = (cos ?)-2·{f(?,0)}-1p(?) (In the formula: ? is the angle of light radiation from the aforementioned individual light sources (31); f(?,0) is the forward-direction radiation-intensity function of the BTDF of the light diffusion plate (40); p(?) is the forward-direction luminance profile of the aforementioned surface light source device (20) resulting from said individual light sources (31); and said forward-direction luminance profile is triangular, trapezoidal, or rectangular taking into account overlap for causing the forward-direction luminance of said surface light source device (20) to be constant.)</p> |
