The present disclosure relates to a semiconductor light emitting device, comprising: a plurality of semiconductor layers, including a first semiconductor layer having a first conductivity, a second semiconductor layer having a second conductivity different from the first conductivity, and an active layer interposed between the first semiconductor layer and the second semiconductor layer, generating light via electron-hole recombination; a first electrode, supplying either electrons or holes to the plurality of semiconductor layers; a second electrode, supplying, to the plurality of semiconductor layers, electrons if the holes are supplied by the first electrode, or holes if the electrons are supplied by the first electrode; a non-conductive distributed bragg reflector coupled to the plurality of semiconductor layers, reflecting the light from the active layer; and a first light-transmitting film coupled to the distributed bragg reflector from a side opposite to the plurality of semiconductor layers with respect to the non-conductive distributed bragg reflector, with the first light-transmitting film having a refractive index lower than an effective refractive index of the distributed bragg reflector.

Semiconductor Light Emitting Device

A light emitting device includes a film lightguide. The lightguide includes a lightguide region and an array of coupling lightguides continuous with the lightguide region, each terminating in a bounding edge and folded such that the bounding edges define a light input surface. A light source emits light into the light input surface. Light propagates within each coupling lightguide to the lightguide region, with light from each coupling lightguide combining with light from one or more other coupling lightguides and totally internally reflecting within the lightguide region. One or more light extraction features frustrate the totally internally reflected light such that light exits the lightguide in a light emitting region. Surface relief features on a surface of a low contact area cover are adjacent to a region of the lightguide with one or more of the surface relief features contacting the lightguide. A method of producing a device is disclosed.

Illumination device comprising a film-based lightguide

A display 1201 includes an array of light modulators 1208 that define a display plane, a light guide 1204 and front- and rear-facing reflective surfaces. The light guide 1204 includes a plurality of geometric light redirectors 1206, and at least 50% of the light guide's rear surface is parallel to the display plane. The rear-facing reflective surface is parallel to the display plane and includes a plurality of apertures.

Display apparatus with optical cavities

In one embodiment, a light emitting device comprises an array of legs extending from a body of film with the bounding edges of the legs stacked, a first light source emitting light of a first color and a second light source emitting light of a second color into the stacked bounding edges where the light emitting region defined within the body is configured to extract light of a third color. In another embodiment, a light emitting device comprises three light sources positioned to direct light into a stacked array of bounding edges. In one embodiment, a method of generating light of adjustable color exiting a surface of a film is disclosed.

Light emitting display with light mixing within a film

The invention relates to methods and apparatus for forming images on a display utilizing a control matrix to control the movement of MEMs-based light modulators.

Display methods and apparatus

A light source device has a continous wave (CW) light source for emitting first direct current (DC) light, a level converter for converting optical electric power of the first DC light into second DC light and outputting the second DC light, and a mixer for mixing an optical main signal having a constant extinction ratio with the second DC light.

Light source device

A light source unit comprising a CW light source emitting a first DC light, a level converter for converting the optical power level of the first DC light to produce a second DC light, and a mixer for mixing an optical main signal having a constant extinction ratio with the second DC light.

Light source unit

In order to measure the propagation channel characteristics in a factory environment, measurements were performed in the 2.4 GHz and 5.2 GHz bands to obtain the received power and delay spread at various locations. The received power at several fixed locations was recorded simultaneously to measure the long-term power fluctuations caused by the dynamic factory environment. Power fluctuations were also recorded from a receiver placed on an Automatic Guided Vehicle (AGV) which frequently moved around a fixed area within the factory. The probability distribution of the received power was compared with several distribution models, and results show that they can be modelled using the stable distribution. Furthermore, analysis of the relationship between delay spread and received power between several transmitter and receiver locations in the factory suggested that they are inversely correlated, where the delay spread increased when the received power decreased.

Kensuke Matsui

Papers

Light source device

Light source unit

Long-term Power Fluctuation and Delay Spread Characteristics in a Factory Environment at 2.4 GHz and 5.2 GHz Bands