Lens element

摘要

The invention provides a switchable lens element comprising an inverse lens structure formed by an isotropic material and an isotropic cover sheet wherein the resulting lens structure comprises an electrically switchable polymer stabilized blue phase LC medium having the same refractive index in its isotropic state. Furthermore, the present invention relates to the use of such a lens element in an electro-optical device i.e. an autostereoscopic display device operable in a 2D mode or a 3D mode, in which a lens arrangement directs the output from different pixels to different spatial positions to enable a stereoscopic image to be viewed and wherein the lens arrangement comprises a plurality of said switchable lens elements.

主权项

1. A lens element comprising a lens structure, and a replica structure
wherein either the lens structure or the replica structure comprises a blue phase LC material comprising one or more compounds of formula I wherein L11 to L16 are independently of each other H or F, R 11 is alkyl, which is straight chain or branched, is unsubstituted, mono- or poly-substituted by F, Cl or CN, and in which one or more CH2 groups are optionally replaced, in each case independently from one another, by —O—, —S—, —NR01—, —SiR01R02—, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CY 01═CY02- or —C≡C— in such a manner that O and/or S atoms are not linked directly to one another, Y01 and Y02 are, independently of each other, F, Cl, or CN, and alternatively one of them may be H, R01 and R02 are, independently of each other, H, or alkyl with 1 to 12 C-atoms, Z 11 is —COO— or —CF2O—and X11 denotes halogen, a mono- or polyhalogenated alkyl-, or alkoxy having 1 to 6 C-atoms or a mono-, di- or polyhalogenated alkenyl having 2 to 6 C-atoms.