198 results about "Optical index" patented technology

A lens assembly of variable focal length comprises two transparent plates (24, 38) at least partially facing each other and parallel to one another and delimiting, at least in part, an internal volume (15) containing two non-miscible liquids having different optical indices. The lens comprises an elastic element (36) capable of deforming in response to a change in pressure of the liquids, in such a way as to substantially maintain the optical properties of the lens assembly, e.g., in order to maintain the parallelism of the two transparent plates.

A light-emitting LED device has one or more light-emitting LED elements, including first and second spaced-apart electrodes with one or more light-emitting layers formed there-between, wherein at least one of the electrodes is a transparent electrode. Also included are a first transparent encapsulating layer having a first optical index formed over the transparent electrode opposite the light-emitting layer; a light-scattering layer formed over the first transparent encapsulating layer opposite the transparent electrode; and a second transparent encapsulating layer, having a second optical index lower than the first optical index, formed over the light-scattering layer.

A variable optical device for controlling the propagation of light has a liquid crystal layer (1), electrodes (4) arranged to generate an electric field acting on the liquid crystal layer, and an electric field modulation layer (3,71) arranged between the electrodes and adjacent the liquid crystal layer for spatially modulating said electric field in a manner to control the propagation of light passing through said optical device. The electric field modulation layer has either an optical index of refraction that is essentially spatially uniform, or a polar liquid or gel, or a very high low frequency dielectric constant material having a dielectric constant greater than 20, and preferably greater than 1000. The modulation layer can have a solid body having a first low frequency dielectric constant with a shape selected to impart a desired modulation of the electric field, and a second low frequency dielectric constant material surrounding or adjacent to the solid body such that the solid body and the second material form a layer geometry.

A variable focus lens comprising a chamber (12) filled with a first liquid (13), a drop of a second liquid (11) being disposed at rest on a region of a first surface of an insulating wall of the chamber, the first and second liquids being non miscible, of different optical indexes and of substantially same density. The first liquid is conductive and the second liquid is insulating. The lens further comprises means for applying a voltage between the conductor liquid and an electrode (16) placed on the second surface of said wall; and centering means for maintaining the centering of the edge of the drop while the voltage is applied and for controlling the shape thereof.

An organic light-emitting diode (OLED) device, comprising: an OLED formed on a substrate having a first and second electrodes and one or more light-emitting organic material layers formed between the electrodes, the organic material layer(s) having a first optical index and at least one of the electrodes patterned to define light-emitting areas; a cover formed over the OLED wherein the cover or substrate is transparent and has a second optical index and the light is emitted through the transparent cover or substrate; a light-scattering layer formed between the cover and substrate for scattering light; a low-index element having an optical index lower than the first and second optical indices formed between the scattering layer and the transparent cover or substrate; and a contrast-enhancement layer comprising a plurality of alternating light-absorbing portions and light-transmissive portions formed in the layer located between the light-scattering layer and the transparent substrate or cover through which light is emitted, wherein a plurality of light-absorbing portions and light-transmissive portions are located in each light-emitting area.

A novel electro-optic optical modulator device and a related method for creating the novel optical modulator device are disclosed. In one embodiment, the novel optical modulator comprises a high index contrast optical waveguide, a mesa region, electrical modulation electrodes, RF transmission lines, and interconnection layers. The high index contrast optical waveguide comprises an electro-optic slab core region and a high index ridge core region. A mesa section which includes the core regions can be formed, and electrical modulation electrodes are placed on etched sidewalls of the mesa section to achieve electro-optical index modulation of the electro-optic slab core region. The RF transmission lines include RF electrodes that connected to the electrical modulation electrodes. The interconnection layers connect the modulation electrodes with the RF electrodes by using etched vias. The novel optical modulator can also incorporate foldable modulation arms for poling in the electro-optic slab core region.

A high brightness LED phosphor coupling device. A semiconductor light source is encapsulated by a medium of first index of refraction, a layer of phosphor surrounded by a second medium of second index of refraction of optical index less than the first index and a light coupler for redirecting most of the light from the light source to an area of the phosphor about equal to the area of the light source multiplied by the square of the ratio of the first to the second index of refraction.

The invention discloses a multi-channel intelligent optical testing device which comprises a light source, a light source control circuit, a wavelength calibration monitoring module and an optical switch which are sequentially connected. One output end of the optical switch is sequentially connected with a polarization controller, a 2*2 shunt and a 1*N optical splitter. One output end of the 2*2 shunt is connected with a first optical power detector, and one input end of the 2*2 shunt is connected with a second optical power detector. The other output end of the optical switch is connected with an N*N shunt, and output ends of the N*N shunt are connected with array optical power detectors in a one-to-one correspondence mode. The light source control circuit, the wavelength calibration monitoring module, the optical switch, the polarization controller, the first optical power detector, the second optical power detector and the array optical power detectors are connected with a control unit. The testing device can test optical indexes of a multi-channel module.

An organic light emitting diode comprises, between a bottom electrode and a top electrode, an organic light-emitting layer and a light-extraction enhancement layer made of a dielectric material. According to the invention, if n_D, is the optical index of said dielectric material, and if λ_M is the center of the range of wavelengths of the emitted light, the thickness of the light-extraction enhancement layer is approximately equal to 5.λ_M/8.n_D. Thank to the invention, light extraction is enhanced in a range of wavelengths superior or equal to 150 nm.

An optical waveguide system includes a generally planar waveguide (1) arranged so that light can be injected by a projector (2) into one edge at a range of out-of-plane angles. The waveguide (1) is tapered so that different out-of-plane angles, after being totally internally reflected for a certain distance, leave the waveguide at different respective points along the waveguide. This expands the image in the direction of propagation along the waveguide. Meanwhile the image is expanded transversely by a parallel-sided input waveguide (3). A large-area flat-panel display is thus created, or the planar waveguide can be used as a planar collimating light source or, using layers of controllable optical index, an optical switch.

A light source for providing light comprises a light emitting layer and a lens comprising a periodic structure therein that is periodic along at least one direction in a plane. The structure includes or is formed from at least two optically transparent materials of different optical indices. The lens is separated from the light emitting layer, and the radiation propagating from the light emitting layer within an angle to a line normal to the plane will be transmitted by the lens to a far field in an index-guided mode. The separation between the light emitting layer and the lens is such that near field radiation propagating from the light emitting layer towards the lens not within said angle to the line will be scattered and redirected by the first lens to the far field to thereby collimate the radiation propagating from the light emitting layer to the far field.

The embodiment of the invention provides a quantum dot fluorescent film with a double-monocolor-layer structure and a manufacturing method thereof; the quantum dot fluorescent film with the double-monocolor-layer structure includes two layers of substrates laminated together; the substrates are PET films, and the opposite inner surfaces of the two-side substrates are respectively provided with a green quantum dot inner film layer made of a green quantum dot composite colloid and a red quantum dot inner film layer made of a red quantum dot composite colloid. According to the embodiment of the invention, the PET films as the substrates are respectively coated with red and green monocolor quantum dot composite colloids, and then two monocolor quantum dot films are laminated to obtain the quantum dot fluorescent film with the double-monocolor-layer structure. With the same amount of quantum dots, the quantum dot fluorescent film with the double-monocolor-layer structure provided by the embodiment of the invention has higher optical intensity, thereby obviously reducing the amount of the quantum dots needed to realize same optical indexes.

The invention relates to a variable focal length lens with a chamber (10) having symmetry of revolution around an axis (14) and containing one first transparent fluid (20) and one second transparent fluid (22) that have different optical indices and are immiscible, so as to form a meniscus (24), and that have different electrical conductivities, and means (30, 40) to modify the curvature of the meniscus.

According to the invention, the means to modify the curvature of the meniscus comprises means of applying an electric field dissymmetrical in relation to the axis of said chamber.

The invention has applications in the production of cameras.

The invention relates to a substrate for an organic light-emitting device (10), comprising a transparent substrate (1) of optical index n0 bearing, on a first main face (11), a transparent or semi-transparent first electrode coating (3), called the bottom electrode, having a sheet resistance less than or equal to 6 O/square and which contains the following multilayer stack: an antireflection sublayer (2) of given optical thickness L1 and optical index n1 such that the n1/n0 ratio is greater than or equal to 6/5; a first metal layer of given thickness e1; a first separating layer of given optical thickness L2; a second metal sheath, having an intrinsic electrical conductivity property, of given thickness e2; and a work-function-matching overlayer, L1 being between 20 nm and 120 nm, L2 being between 75 nm and 200 nm, and the sum of the thicknesses e1 + e2 of the first and second metal layers being less than or equal to 40 nm.

An optical device comprises a transparent blade the first surface of which is reflective; a first partially reflective and partially transmissive layer covering a second surface of the transparent blade opposite the first surface, and a second layer covering the surface of the first layer opposite the transparent blade, wherein the second layer is made of a material having an optical index which differs from the optical index of the transparent blade by less than 10% and preferably by less than 5%, and the second layer comprises, on the surface thereof opposite the first layer, structures forming a diffraction grating suitable for promoting the extraction of light towards the outside of the transparent blade.