A panel assembly for a window shade includes two elongate strips made of a single material layer that are bonded to a support sheet having a multilayer structure. Each elongate strip has a first and a second edge, and a main strip portion between a first and a second margin, the first and second margin respectively adjoining the main strip portion along a first and a second folding line, the first margin extending between the first folding line and the first edge, the second margin extending between the second folding line and the second edge and including a third folding line. The first margin of each elongate strip is bonded to the support sheet, and the second margin of a first elongate strip is bonded to a second elongate strip at a first margin portion between the third folding line and the second edge of the first elongate strip.

An LED-based illumination system includes a layered optical sheet-form structure and a light source. The sheet-form structure comprises a first optically transmissive sheet with parallel channels formed in its first major surface. Each channel has a triangular cross-section with opposing planar walls configured for total internal reflection. A second optically transmissive sheet is bonded to the first sheet's surface using an optically transmissive adhesive, at least partially encapsulating the channels. An optically transmissive light diffusing sheet is provided as part of the sheet-form structure. The second sheet's outer surface has light deflecting microstructures. The light source comprises multiple LEDs configured to illuminate the layered structure at incidence angles from 0 to at least 75 degrees. The layered optical sheet-form structure may include additional features such as perpendicular channel arrays or specularly reflective side walls.

An optical article for illuminating building interiors including a reflective grid and a light diffusing element positioned between the reflective grid and a light source. The reflective grid includes one or more arrays of transverse reflective surfaces and is configured to partially transmit and partially redirect incident light over a broad angular range.

A roller shade may be retracted and extended. In various implementations, when a roller shade is extended it may be laterally repositioned. The roller shade may include a track and a travelling member.

Disclosed herein is a window covering having adjustable securement mechanisms that are operable to secure at least a portion of the window covering at a certain location once the window covering has been manipulated. As described, the window covering includes a panel and at least one guide coupled to a first side of the panel. The window covering also includes at least one sliding securement mechanism coupled to the guide. The at least one sliding securement mechanism is operative to move along the guide and secure at least a portion of the panel at different positions along the guide.

The present disclosure relates generally to light management constructions comprising microstructured prismatic elements useful in the preparation of sun-facing light redirecting films having reduced glare.

A roller shade may be retracted and extended. In various implementations, when a roller shade is extended it may be laterally repositioned. The roller shade may include a track and a travelling member.

A manually operated override release mechanism for use with a motorized window shade assembly having a shade fabric with a leading edge, the shade fabric being disposed behind a pane and movable between an opened position and a closed position upon operation of a motor. The override release mechanism has an actuator movable between a first position and a second position and biased in the first position. The actuator has a first side secured to one end of a cable, and a second side. The other end of the cable is connected to the motor.

A non rectangular controllable window covering, for a window frame of corresponding non rectangular shape and having a covering frame defining a base frame segment and a non rectangular frame segment together forming a covering frame to fit the non rectangular window frame, and a window covering supported in the covering frame, consisting of a first covering panel and a second covering panel spaced apart from one another, one of the covering panels being movable relative to the other, and, a control element connected to the moveable covering panel.

Disclosed herein is a window covering having adjustable securement mechanisms that are operable to secure at least a portion of the window covering at a certain location once the window covering has been manipulated. As described, the window covering includes a panel and at least one guide coupled to a first side of the panel. The window covering also includes at least one sliding securement mechanism coupled to the guide. The at least one sliding securement mechanism is operative to move along the guide and secure at least a portion of the panel at different positions along the guide.