A head up display device includes a pancake lens and a picture generation unit. The pancake lens includes a half mirror and a reflective polarizer. The half mirror has a light incident surface and a reflective surface. The reflective polarizer is disposed on the reflective surface and combined with the half mirror for forming a reflective space. The picture generation unit is disposed in the direction of the pancake lens opposite to the user's eyes. The picture generation unit generates image light and the image light enters the reflective space from the light incident surface. After the reflection, the image light is directed towards the user's eyes to form a virtual image. The optical path of the virtual image and the image light has a un-axis angle.

The optoelectronic device includes a matrix of optoelectronic components including semiconductor optical amplifiers SOAs, the semiconductor optical amplifiers SOAs containing an active layer of gallium nitride GaN having multiple InGaN/GaAsN or InGaN/AlGaN quantum wells on a substrate of p-doped gallium nitride and covered with a layer of n-doped gallium nitride. The p-doped gallium nitride GaN substrate forms a column of p-GaN covered with a layer of an insulator in biocompatible material. The device can include a matrix having multiple electronic components of different heights. The optoelectronic component can be a photodiode or a semiconductor optical amplifier SOA. This optoelectronic device can be used in epiretinal or subretinal prostheses. A single epiretinal or subretinal prosthesis can include a matrix of photodiodes and a matrix of semiconductor optical amplifiers SOAs.

The invention relates to an optical security system comprising an optical element with a patterned anisotropic optical property, wherein information is encoded and encrypted in the pattern of the optical element. The system further comprises a patterned polarizer in which the pattern is such that the information stored in the optical element can be decrypted.

In various embodiments, a pancake lens block may include (i) a first compound retarder comprising a first plurality of retarders oriented to a plurality of first axes of orientation, respectively, where the first compound retarder is configured to selectively transmit a portion of the emitted light, (ii) a partial reflector that receives the portion of emitted light from the first compound retarder and transmits the portion of the emitted light, (iii) a second compound retarder comprising a second plurality of retarders oriented to a plurality of second axes of orientation that are substantially orthogonal to the respective plurality of first axes of orientation, and (iv) a reflective polarizer configured to reflect the portion of the emitted light selectively transmitted by the second compound retarder back to the second compound retarder.

Provided is a light source device including a plurality of light emitting points arranged in matrix within a first cross section parallel to a first direction and a second direction. When light emitting points are projected within a second cross section parallel to first direction and a third direction perpendicular to first cross section, light emitting points have equal intervals between projections adjacent to each other. When light emitting points are projected within a third cross section parallel to second and third directions, light emitting points have equal intervals between projections adjacent to each other. An interval between light emitting points adjacent to each other in a row of matrix, an interval between light emitting points adjacent to each other in a column of matrix, an angle between row and column, an angle between column and first direction, and an angle between row and second direction are appropriately set.

The present invention provides a laminate film and a display member including the laminate film, which are excellent in visibility of external information such as scenery and displayability of information from a projection member, and are also excellent in color tone reproducibility. The laminate film includes a laminate of 50 or more alternately arranged layers of a plurality of different thermoplastic resins, the laminate film having a transmittance of light incident perpendicularly to a film surface of 50% or more, the laminate film satisfying a relationship of R20≤R40<R70, wherein R20, R40, and R70 are reflectances of a P-wave incident at angles of 20°, 40°, and 70°, respectively, to the normal to the film surface, the reflectance of R70 being 30% or more, reflected light of the P-wave incident at 70° to the normal to the film surface having a saturation of 20 or less.

In various embodiments, a reverse-order crossed pancake lens block having an index gradient structure may include an optical element configured to transmit at least a portion of radiation from a radiation source. Moreover, the pancake lens block may include an index-gradient structure that is spaced at a distance from the optical element, the distance configured to provide an optical path length in the pancake lens block. The index-gradient structure may be configured to provide an anti-reflective property to at least one surface of the optical element.

The present invention relates to a HUD system comprising a. a light source (14) projecting polarized light towards a glazing (10), said glazing (10) comprising an outer sheet of glass (11) having a first surface (P1) and a second surface (P2), and an inner sheet of glass (12) having a first surface (P3) and a second surface (P4), b. wherein over at least a portion of at least one of the surface (P1, P2, P3, P4) of the outer (11) and/or the inner sheet of glass (12) comprises a first enhanced p-polarized reflective coating (13). According to the present invention, the said light source (14) projecting polarized light comprises a waveplate (18) to compensate glass retardation in order to have P-polarized light at the outer face (P1) of the outer glass sheet (11).

Methods of making optical films and optical stacks are described. A method of making an optical lens molded to a first curved optical film includes providing a first optical film including alternating first and second polymeric layers; providing a thermoform tool having a curved surface; heating and conforming the first optical film to the curved surface to form a first curved optical film; and molding an optical lens onto the first curved optical film.

An optical filter may include a substrate. The optical filter may include a set of alternating high refractive index layers and low refractive index layers disposed onto the substrate to polarization beam split incident light. The set of alternating high refractive index layers and low refractive index may layers may be disposed such that a first polarization of the incident light with a spectral range of less than approximately 800 nanometers (nm) is reflected by the optical filter and a second polarization of the incident light with a spectral range of greater than approximately 800 nm is passed through by the optical filter. The high refractive index layers may be hydrogenated silicon (Si:H). The low refractive index layers may be silicon dioxide (SiO.sub.2).