US 12,066,708 B2
Optical sheet, light controlling member, surface light source device, image source unit, and display
Tsuyoshi Kashiwagi, Tokyo (JP)
Assigned to Dai Nippon Printing Co., Ltd., Tokyo (JP)
Filed by Dai Nippon Printing Co., Ltd., Tokyo (JP)
Filed on Jun. 15, 2023, as Appl. No. 18/335,214.
Application 18/335,214 is a continuation of application No. 17/805,881, filed on Jun. 8, 2022, granted, now 11,747,669.
Application 17/805,881 is a continuation of application No. 16/498,786, granted, now 11,378,837, issued on Jul. 5, 2022, previously published as PCT/JP2018/013792, filed on Mar. 30, 2018.
Claims priority of application No. 2017-073064 (JP), filed on Mar. 31, 2017; application No. 2017-096078 (JP), filed on May 12, 2017; and application No. 2017-166515 (JP), filed on Aug. 31, 2017.
Prior Publication US 2023/0324735 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/1335 (2006.01); G02B 3/08 (2006.01)
CPC G02F 1/133526 (2013.01) [G02F 1/133562 (2021.01); G02F 1/133607 (2021.01); G02B 3/08 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A planar optical sheet that is made of a plurality of laminated layers, the planar optical sheet comprising:
an optical functional layer that is one of a plurality of the laminated layers; and
an optical element layer that is another one of a plurality of the laminated layers,
wherein the optical functional layer has a plurality of light transmissive portions each having a trapezoidal cross section, and extending in one direction, the light transmissive portions being arranged at intervals in a direction different from the one direction, and a light absorbing portion that is arranged between respective adjacent light transmissive portions,
wherein the optical element layer extends so as to be offset from the one direction at an angle of 1° to 10° in a front view of the optical sheet, the optical element layer having a plurality of unit optical elements that are ridges aligned in a direction different from a direction in which the optical element layer extends,
wherein each of the unit optical elements has a triangular cross section having a main refracting face and a rise face, and
wherein the main refracting face is a face inclining in a direction of a normal line of a light exiting face of the optical functional layer at more than 45° and no more than 89°.