US Patent 7178968 Surface light source device and liquid crystal display device

In a surface light source device including: a light source section having a light emitting face; an optical panel arranged so as to cover the light emitting face; and a at least one frame having a front face portion that covers the peripheral portion of the light emitting face, the at least one frame is composed of a plurality of divisional members connected with each other and a light shielding portion is provided at each slit between the divisional members in the front face portion of the at least one frame. Whereby, light from the light source section is prevented from leaking through each slit between the divisional members in the front face portion of the at least one frame.