331 results about "Shape moiré" patented technology

A backlit light display comprises a light guide panel, a prismatic film, an asymmetric top diffuser and an LCD. A linear light source is disposed along a side face of the light guide panel. Light from the linear light source is transmitted though the light guide panel where it is spread and uniformly output through a front face to the prismatic film. Light incident on the prismatic film is redirected more along a first direction than along a second direction. This light is directed more normal to the LCD. An asymmetric diffuser is applied between the prismatic film and the LCD panel to smear the periodic information from the prismatic film and eliminate the Moiré fringe pattern resulting from interference between the periodic structure of the prismatic film and the periodic arrangement of pixels in the LCD. The asymmetric diffuser is aligned with respect to the prismatic film such that it scatters and spreads light more in a second direction than the first direction.

An X-ray imaging apparatus comprises a first grid, a second grid, and an X-ray image detector. The first grid passes X-rays emitted from an X-ray source and produces a first periodic pattern image. The second grid opposes the first grid. The second grid partly blocks the first periodic pattern image and produces a second periodic pattern image with moiré fringes. The X-ray image detector detects the second periodic pattern image and produces image data. The X-ray image detector has pixels arranged in two dimensions in X and Y directions. The M pixels arranged in the Y direction form one group. The group is shifted in the Y direction by the number of the pixels less than M each time. A phase of an intensity modulated signal, composed of pixel values of the pixels in the each shifted group, is calculated. Thereby a differential phase image is produced.

The present invention relies on a band moiré image layout model capable of predicting the band moiré image layer layout produced when superposing a base band grating layer of a given layout and revealing line grating layer of a given layout. Both the base band grating layer and the revealing line grating layer may have a rectilinear or a curvilinear layout. The resulting band moiré image layout may also be rectilinear or curvilinear. Thanks to the band moiré image layout model, one can choose the layout of two layers selected from the set of base band grating layer, revealing line grating layer and band moiré image layer and obtain the layout of the third layer by computation, i.e. automatically. In the case of a concentric band moiré image, base band grating layer and revealing line grating layer layouts may be produced according to geometric transformations, which yield, upon relative displacement of the position sampled by the revealing layer on the base layer, a band moiré image whose patterns move either radially, circularly or according to a spiral trajectory, depending on the orientation of the base band replication vector in the original non-transformed base layer space. In addition, it is possible to conceive a revealing line grating layer which when translated on top of the base band grating layer, generates a band moiré image which is subject to a periodic deformation. Furthermore, thanks also to the availability of a large number of geometric transformations and transformation variants (i.e. different values for the transformation constants), one may create documents having their own individualized document protection. The base band layer and the revealing layer may be separated by a small gap and form a fixed composed layer, where, thanks to the well-known parallax effect, by tilting the composed layer in respect to an observer, different positions of the base layer are sampled and a dynamically moving moiré image is generated. A computing system may automatically generate upon request an individualized protected security document having specific base band grating and revealing line grating layouts. The computing system may then upon request generate and issue a security document incorporating the base band grating layer, a base band grating layer or a revealing line grating layer allowing to authenticate a previously issued security document. The presented methods may be used for creating an individualized protection for various categories of documents (banknotes, identity documents, checks, diploma, travel documents, tickets) and valuable products (optical disks, CDs, DVDs, CD-ROMs, packages for medical drugs, products with affixed labels, watches).

To provide a light diffusing sheet which enables the light from a lightguide plate or light source of a backlight unit to be conducted to lens film after having been converted to diffused light having a small brightness peak angle, and which generates neither a moiré or interference fringe nor luminance unevenness, and is advantageous also in terms of productivity and cost, and to provide a backlight unit having this light diffusing sheet incorporated therein, and the surface of the sheet with fine recesses formed therein serves as a light emission side. The light diffusing sheet comprises a light-transmitting resin, characterized by having fine recesses formed in at least one of the surfaces thereof, the fine recesses having a shape which is any of the shapes of an inverted polyangular pyramid, an inverted truncated polyangular pyramid, an inverted cone, and an inverted truncated cone.