摘要:
Retroreflective article having tailored optical properties and method for making the same. Retroreflective articles according to the present application comprise deformed cube corner elements having reduced optically active volume and reduced active volume height. Exemplary retroreflective articles have at least one of minimized contrast caused by seam welds, tiling lines or defects under retroreflective conditions, markings discernible at different viewing conditions and reduced overall retroreflectivity.
摘要:
Assemblies containing a substrate with pockets for electromagnetically responsive particles can be made for a variety of uses, including, for example, display media, lenses, and color-changing fabric. The arrangement of these pockets can be selected to provide higher particle density than previously realized. The assembly includes an assembly substrate (840), particles, and a top coat layer (848).
摘要:
A roll of an article, such as a film (10), comprising a body portion (12) and a surface portion (14) is provided. The body portion has (i) a first and a second surface, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axis in a thickness direction of the body. The surface portion comprises a geometric feature (16). The roll preferably has a cushioning layer between the plies of the article in the roll.
摘要:
A backlight unit (10), for a display or for general Iighting purposes, has a hollow cavity (16) instead of a solid Iight guide. One or more Iight sources (24a-c), e.g. LEDs, emit Iight into the cavity, which is formed by a front (12) and a back reflector (14). The backlight has either a directly-lit or an edge-lit configuration; it can have a Iarge area and still be thin; it consists of fewer components than conventional devices and its design permits the reuse of Iight reflected internally (Iight recycling). The unit emits Iight of a predefined polarisation and its viewing angle properties can be tailored. Light is uniformly distributed within the guide and the guide's output (20b, 20d) is substantially collimated. Such backlights occupy a specific region in a parameter space defined by two parameters: first, the ratio of the output emission area to the total source emission area should lie in the range from 0.0001 to 0.1 ; and second, the ratio of SEP (an average plan view source separation, which is a measure of the average spacing of the Iight sources in the plane of the unit) to the height of the cavity (H) should be in the range from 3 to 10. There is also a discussion of the required number of light sources N, their arrangement near the periphery of the cavity, as well as the shape and size of the output emission area. The backlight exhibits a minimum brightness uniformity (VESA) value, even when a subset of M adjacent sources is switched off (where M is at least 0.1 N or M>2 or both).
摘要:
The present invention relates to a retroreflective article comprisina a retroreflective sheeting. The retroreflective article further comprising an infrared-reflecting material disposed on at least a portion of the retroreflective sheeting, wherein the infrared-reflecting material is not significantly visible in the visible light spectrum.