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10 Feb 2005
The pick of this week's applications including a display that switches between 2D and 3D viewing modes.
• Title: Autostereoscopic display apparatus
Applicant: Koninklijke Philips Electronics, the Netherlands
International application number: WO 2005/011291
A display which can switch been an autostereoscopic three-dimensional and a two-dimensional mode is the subject of application WO 2005/011291. The display comprises two critical elements: a lenticular sheet and an electrically-controlled diffuser. According to inventors at Philips, the diffuser is made up of optical medium with a structured surface and an electro-optic medium such as a small droplet polymer dispersed in a liquid crystal. The electro-optic material's refractive index varies in response to an applied electric field. When the refractive index of the electro-optic material matches that of the optical medium, this creates the so-called non-diffusing mode and provides 3D viewing. When the refractive indices of the two materials are different, this provides a diffusing effect and 2D viewing.
• Title: Mechanical protection for semiconductor edge-emitting ridge waveguides
Applicant: Emcore Corporation, US
International application number: WO 2005/011072
Emcore of the US has come up with a way to prevent high-speed ridge waveguide lasers being damaged during their manufacture. Laser chips are typically handled by pick-and-place tools which use a vacuum to hold the chip. Because the ridge structure protrudes above the junction surface, it can be damaged during manufacture. To get around this, Emcore's application proposes placing a number of pads on the non-active area of the junction surface that rise above the ridge structure. The pads are formed on the chip as it is being processed.
• Title: In-pavement directional LED luminaire
Applicant: Farlight LLC, US
International application number: WO 2005/011329
Patent application WO 2005/011329 describes an LED-based source which can be used as part of an airfield's lighting system. According to the applicants, their directional in-pavement system suits use in runways and taxiways including the centreline and touchdown zone. The unit contains a power controller, a light module and a thermoelectric cooler. The power controller is connected to the airfield's supply. The light module uses several high flux LEDs and a non-imaging light transformer which collects and redistributes the light from the LEDs in a predetermined pattern. The cooler helps to control the LED's flux, color and intensity distribution.
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