31 Mar 2005
The pick of this week’s applications from Kodak, Intel and JDS Uniphase.
• Title: Forming an organic layer in an OLED
Applicant: Eastman Kodak Company, US
International application number: WO 2005/027236
Scientists at Kodak have devised a laser-based apparatus for fabricating organic LEDs. The set-up described in application number WO 2005/027236 includes a light-absorbing layer and a layer containing a heat transferable organic material. A fluid-driven pressure plate moves the two layers into close contact within the focal plane of the laser. Held in tight tolerance, the layers respond to localized laser heating that can be guided to create an array of organic electroluminescent pixels. According to its inventors, the technique suits large, high-resolution OLED displays, which are difficult to create using conventional shadow masking, and can be operated in vacuum to minimize contamination and subsequent device failure.
• Title: Optical waveguide devices having adjustable waveguide cladding
Applicant: Intel Corporation, US
International application number: WO 2005/026829
Intel is attempting to patent an optical waveguide that has adjustable waveguide cladding. The waveguide may be used to control or modulate guided light and its compact design could benefit monolithically integrated optoelectronic devices and systems. As the applicants explain, the waveguide cladding could be made from electro-optic material and an electrical control voltage applied to modulate the cladding's refractive index. Alternatively, the cladding could be made from a radiation sensitive material whose refractive index changes in response to illumination by a beam of electromagnetic radiation, or a thermally sensitive material whose index changes with temperature.
• Title: Patterned reflective optical structures
Applicant: JDS Uniphase Corporation, US
International application number: WO 2005/026848
JDS Uniphase has come up with an optically active coating that increases the visibility of credit card holograms and could help combat counterfeiting. Diffuse light sources, such as ordinary room lighting, can suppress much of a hologram's visual detail and make it difficult for shop workers to authenticate the security device. The US firm's coating consists of a color shifting thin film or color shifting flakes. These enhance the visibility of the hologram and make it distinctive and easy to identify under normal lighting conditions.