Abstract: A surface light source device includes a light source; a light guide plate that has a light entrance surface through which light enters, and that emits the light entering through the light entrance surface from a light exit surface; a wiring board; and a metal frame. The metal frame includes a bottom portion having a bottom surface that faces a surface on an opposite side to the light exit surface, a side wall erected on an outer periphery of the bottom surface, and a projecting portion provided on the side wall so as to project toward the bottom surface side. The metal frame houses the light source, the light guide plate, and the wiring board. At least a part of the light source is disposed between the bottom portion and the projecting portion, and the wiring board is disposed between the light source and the bottom portion.

Abstract: A surface light source device includes a light source; a light guide plate that has a light entrance surface through which light enters, and that emits the light entering through the light entrance surface from a light exit surface; a wiring board; and a metal frame. The metal frame includes a bottom portion having a bottom surface that faces a surface on an opposite side to the light exit surface, a side wall erected on an outer periphery of the bottom surface, and a projecting portion provided on the side wall so as to project toward the bottom surface side. The metal frame houses the light source, the light guide plate, and the wiring board. At least a part of the light source is disposed between the bottom portion and the projecting portion, and the wiring board is disposed between the light source and the bottom portion.

Abstract: A lens array capable of effectively converging light entering from a light source and constituting a liquid crystal device of a high contrast includes liquid crystal of a twisted nematic type sandwiched between a TFT substrate and a counter substrate. A micro lens array is formed in the counter substrate. Lenses constituting the micro lens array respectively have a shape of a rotational aspheric surface, and an optical center axis F thereof is tilted in a bright vision direction of the liquid crystal.

Abstract: A lens array capable of effectively converging light entering from a light source and constituting a liquid crystal device of a high contrast includes liquid crystal of a twisted nematic type sandwiched between a TFT substrate and a counter substrate. A micro lens array is formed in the counter substrate. Lenses constituting the micro lens array respectively have a shape of a rotational aspheric surface, and an optical center axis F thereof is tilted in a bright vision direction of the liquid crystal.

Abstract: A multi-layered microlens array substrate is disclosed. The substrate includes a first layer having a plurality of microlenses disposed at an object side of the substrate, a second layer having a plurality of microlenses disposed at an image side of the substrate and attached to a liquid crystal device, and a third layer disposed between the first layer and the second layer. A refractive index of the third layer is different from that of the first layer and the second layer. A focal point of a compound lens formed by the second layer and the third layer is positioned proximate to an interface between the third layer and the first layer so that incident beams incidenting on the focal point from the object side of the substrate in different angles are refracted through the substrate in a manner that those incident beams are focused on a pixel of the liquid crystal device that is disposed at a position that corresponds to the microlens of the first and second layers.