Optical member, light-emitting device, display, and illuminator

A light-emitting device comprising:

• a light source;
• and
• an optical member,
• the optical member including
• a first transparent optical sheet extending along a first surface, the first surface being orthogonal to a first axial direction, and
• a second transparent optical sheet disposed to be superimposed on the first transparent optical sheet in the first axial direction, the second transparent optical sheet extending along the first surface,
• the first transparent optical sheet including a structure in which a first region and a second region are alternately disposed in a second axial direction parallel to the first surface, the first region outputting first outgoing light, the first outgoing light being generated by refracting first incoming light from the light source to a first direction along the second axial direction, the first incoming light proceeding along the first axial direction, the second region outputting second outgoing light, the second outgoing light being generated by refracting second incoming light from the light source to a second direction opposite to the first direction, the second incoming light proceeding along the first axial direction,
• the second transparent optical sheet including a structure in which a third region and a fourth region are alternately disposed in a third axial direction parallel to the first surface, the third region outputting third outgoing light, the third outgoing light being generated by refracting third incoming light from the light source to a third direction along the third axial direction, the third incoming light proceeding along the first axial direction, the fourth region outputting fourth outgoing light, the fourth outgoing light being generated by refracting fourth incoming light from the light source to a fourth direction opposite to the third direction, the fourth incoming light proceeding along the first axial direction,
• an angle formed by the third axial direction with respect to the second axial direction being equal to or greater than 0° and less than 45°,
• wherein the third outgoing light and the fourth outgoing light include a portion of the light from the first incoming light and the second incoming light, the portion including light that is incident on the first transparent sheet in directions that form angles relative to the first axial direction in a range of approximately −18 degrees to approximately +90 degrees, the −18 degrees being defined by rotating 18 degrees away from the axial direction and toward the second direction, and the +90 degrees being defined by rotating 90 degrees away from the axial direction and toward the first direction.

A display comprising:

• a light source;
• a first optical member;
• and
• a liquid crystal panel,
• the light source, the first optical member, and the liquid crystal panel being provided in order,
• the first optical member including
• a first transparent optical sheet extending along a first surface, the first surface being orthogonal to a first axial direction, and
• a second transparent optical sheet disposed to be superimposed on the first transparent optical sheet in the first axial direction, the second transparent optical sheet extending along the first surface,
• the first transparent optical sheet including a structure in which a first region and a second region are alternately disposed in a second axial direction parallel to the first surface, the first region outputting first outgoing light to the liquid crystal panel, the first outgoing light being generated by refracting first incoming light from the light source to a first direction along the second axial direction, the first incoming light proceeding along the first axial direction, the second region outputting second outgoing light to the liquid crystal panel, the second outgoing light being generated by refracting second incoming light from the light source to a second direction opposite to the first direction, the second incoming light proceeding along the first axial direction,
• the second transparent optical sheet including a structure in which a third region and a fourth region are alternately disposed in a third axial direction parallel to the first surface, the third region outputting third outgoing light to the liquid crystal panel, the third outgoing light being generated by refracting third incoming light from the light source to a third direction along the third axial direction, the third incoming light proceeding along the first axial direction, the fourth region outputting fourth outgoing light to the liquid crystal panel, the fourth outgoing light being generated by refracting fourth incoming light from the light source to a fourth direction opposite to the third direction, the fourth incoming light proceeding along the first axial direction,
• an angle formed by the third axial direction with respect to the second axial direction being equal to or greater than 0° and less than 45°,
• wherein the third outgoing light and the fourth outgoing light include a portion of the light from the first incoming light and the second incoming light, the portion including light that is incident on the first transparent sheet in directions that form angles relative to the first axial direction in a range of approximately −18 degrees to approximately +90 degrees, the −18 degrees being defined by rotating 18 degrees away from the axial direction and toward the second direction, and the +90 degrees being defined by rotating 90 degrees away from the axial direction and toward the first direction.

An illuminator provided with a light-emitting device that includes a light source and an optical member,

• the optical member comprising:
• a first transparent optical sheet extending along a first surface, the first surface being orthogonal to a first axial direction;
• and
• a second transparent optical sheet disposed to be superimposed on the first transparent optical sheet in the first axial direction, the second transparent optical sheet extending along the first surface,
• the first transparent optical sheet including a structure in which a first region and a second region are alternately disposed in a second axial direction parallel to the first surface, the first region outputting first outgoing light, the first outgoing light being generated by refracting first incoming light from the light source to a first direction along the second axial direction, the first incoming light proceeding along the first axial direction, the second region outputting second outgoing light, the second outgoing light being generated by refracting second incoming light from the light source to a second direction opposite to the first direction, the second incoming light proceeding along the first axial direction,
• the second transparent optical sheet including a structure in which a third region and a fourth region are alternately disposed in a third axial direction parallel to the first surface, the third region outputting third outgoing light, the third outgoing light being generated by refracting third incoming light from the light source to a third direction along the third axial direction, the third incoming light proceeding along the first axial direction, the fourth region outputting fourth outgoing light, the fourth outgoing light being generated by refracting fourth incoming light from the light source to a fourth direction opposite to the third direction, the fourth incoming light proceeding along the first axial direction,
• an angle formed by the third axial direction with respect to the second axial direction being equal to or greater than 0° and less than 45°,
• wherein the third outgoing light and the fourth outgoing light include a portion of the light from the first incoming light and the second incoming light, the portion including light that is incident on the first transparent sheet in directions that form angles relative to the first axial direction in a range of approximately −18 degrees to approximately +90 degrees, the −18 degrees being defined by rotating 18 degrees away from the axial direction and toward the second direction, and the +90 degrees being defined by rotating 90 degrees away from the axial direction and toward the first direction.