A method of making an optical filter film with varying optical properties includes the step of drawing a multilayer polymeric preform into an optical filter and varying at least one environmental condition being a member of the group including of heat, pressure, tension, and a drawing speed, the at least one environmental condition being varied over time or over a distance, or both, and causing a variation in layer thickness within the optical filter. The preform may be drawn through a furnace subjecting the preform to a heating power that varies across a width of the furnace or over time or both across the width and over time. The preform may also be drawn through the furnace while the drawing speed varies across a width of the furnace or over time or both across the width and over time.

Methods of forming optical articles from lyotropic liquid crystal solutions are disclosed. A lyotropic liquid crystal solution is shear-coated on a temporary substrate to form a birefringent coating layer of 4 micrometers or less in thickness. A permanent substrate is adhered to the birefringent coating layer and the temporary substrate is removed. Optical articles formed by such methods are also disclosed.

A method to make dyed functional film comprising the steps of providing a soluble polymer material; adding an appropriate solvent to the polymer material to make a soluble polymer solution; providing a soluble dye; adding an appropriate solvent to the dye to make a soluble dye solution; adding the dye solution to the polymer or PVA solution, and introducing the dyed polymer or PVA solution to a solution casting device; removing a thin dyed functional film from the casting device; and letting the dyed functional film dry and solidified.

The present invention discloses an optical assembly. The optical assembly comprises a first optical film, a second optical film and an adhesive layer between the first optical film and the second optical film. The top surface of the adhesive layer is disposed on the bottom surface of the first optical film. The adhesive layer comprises a plurality of first acrylate functional groups. The second optical film comprises a plurality of microstructures. Each of the plurality of microstructures has a top planar portion having a plurality of second acrylate functional groups. The top planar portion is bonded to the bottom surface of the adhesive layer through a chemical bonding between the plurality of first acrylate functional groups and the plurality of second acrylate functional groups without making the top planar portion penetrate into the adhesive layer.

A long-length film formed of a resin containing a polymer having crystailizability, wherein the long-length film has an orientation axis perpendicular to a long side direction of the long-length film, the long-length film has an Nz factor Nz1 satisfying (formula 1), the long-length film has a birefringence n satisfying (formula 2), and the polymer has a crystallization degree X satisfying (formula 3):
1.0Nz11.15(formula 1)
0.01n0.1(formula 2)
15%X(formula 3).

This application discloses an optical sheet, including a polymer layer; a certain number of small short lines, the certain number of small short lines being formed at a side of the polymer layer and forming a micro-nano structure; wherein at least one of the small short lines is of a convex structure or a concave structure, and two sidelines of the small short line are parallel to each other or intersect in a plane. This application provides a new texture structure, in which directions of the small short lines may be changed randomly or according to a wanted effect in a certain direction. There exists at least one light pillar in the optical sheet with such a texture structure under a certain light source. The cover plate for an electronic device adopts the texture structure or the optical sheet.

A retardation film including a retardation coating layer including a polyimide and a solvent, wherein the solvent has a vapor pressure of less than about 15 Torr at 20 C. and a solubility parameter satisfying Relationship Formula 1.

16{square root over (.sub.D.sup.2+.sub.P.sup.2+.sub.H.sup.2)}<20[Relationship Equation 1]

The invention relates to a method for producing a thin and substantially fracture-resistant display device comprising a display, wherein an upper layer having a surface facing an observer is arranged on light-emitting luminous surfaces of the display, wherein micro-passages for transmitting generated light from the light-emitting luminous surfaces of the display are formed in the upper layer and form micro-openings in the surface facing an observer, wherein a substantially planar surface facing the observer is created on the upper layer, and wherein creating the substantially planar surface comprises processing the surface of the display device facing the observer by means of a laser and/or by means of machining in order to produce the substantially planar surface. Furthermore, the invention relates to a display device.

Described is a polyimide prepared from a diamine containing a spiro or cardo group in a molecule structure, wherein the dimensional stability of the polyimide can be improved at a high temperature, and thus the polyimide can provide a polyimide film useful for a flexible substrate.

Retroreflective sheeting having a structured layer of cube corner elements and an at least one optically variable mark therein, and methods of making same.