BACKLIGHT DEVICE, LIQUID CRYSTAL DISPLAY APPARATUS, AND LENS

摘要

Provided is a backlight device having: a light source element having LEDs and a lens expanding light from the LEDs; a housing containing the element; a diffuser plate covering an opening portion of the housing; and a reflection sheet reflecting light emitted from the element, toward the diffuser plate. The LEDs are arranged in one or more rows, at a central zone. The lens has an incident surface receiving light from the LEDs, and an exit surface from which the light goes out, being expanded. The incident surface is a continuous concave surface, and the projected shape thereof as seen from an upper surface of the lens is an ellipse centered on an optical axis of the lens.