Patent ID: 7364336

Claim:
A plane light source device used for transmissive-type liquid crystal display panel, said plane light source device comprising a housing having an opening section, a scattering plate arranged at said opening section for scattering incoming light onto said liquid crystal display panel, and a light source arranged in said housing, said plane light source device further comprising: a regular reflection section which regularly reflects incoming light from said light source and a scatter reflection section which irregularly reflects said incoming light, wherein both said regular reflection section and scatter reflection section are provided at a bottom surface of said housing opposite to said scattering plate, wherein said scatter reflection section and said regular reflection section are arranged so as to have an overlapping section where both sections are partially overlapped with each other, further wherein a refracting device for refracting light emitted from said light source toward said regular reflection section and said scatter reflection section is provided at the position where light from said light source is emitted.