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CMOS image sensors and displays are the two big drivers of opto-electronics
and youŽll find them in nearly every mobile phone. But there
are more important opto-electronic products in the markets.
Some of them are collected in this newsletter. Enjoy!
Wolfgang Patelay
Technical Editor, EPN
Super-bright LEDs (American Bright Optoelectronics)
The BLF series of super-flux LEDs produces a typical luminous intensity of 5000mcd at 50mA in white with a viewing angle of 90°. The 625nm red version produces a typical luminous intensity of 3500mcd at 70mA with a viewing angle of 40° for use in brakes and driving light applications. The 589nm yellow version outputs 1,000mcd at 70mA with a viewing angle of 70°. The blue 465nm super-flux LED has the widest viewing angle (120°).
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Laser-fibre module (AMS Technologies)
AMS Technologies introduces QPCs (Quintessence Photonics) latest laser designed to deliver high power in a single-mode beam for seeding fibre and solid-state lasers and for use in direct applications.
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Gate-drive opto-couplers (Avago Technologies)
The ACPL-3130, ACPL-J313 and ACNW-3130 gate-drive opto-couplers target applications such as isolated IGBT/MOSFET-gate drives. The devices feature a common-mode rejection (CMR) ratio of 40kV/”s at a common-mode voltage (VCM) of 1500V.
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4-Mbit/s IrDA Module (Rohm Electronics)
The RPM972-H14 infrared communications module, which is only 2.2mm high, comes with a remote control transmission function that conforms to the 4-Mbit/s fastinfrared (FIR) specifications of the Infrared Data Association (IrDA).
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Step-by-step LCD TFT touch-screen design
Touch-screen interfaces are a popular choice for industrial and commercial computer systems. This technology eliminates the need for a keyboard or traditional mouse, offering instead a simple, direct interaction with graphical icons that represent the specific tasks at hand. Chris Bartram from Apollo Display Technologies explains in his article in EPN that key to the successful application of touch screens is selecting the right technology and addressing the steps necessary to integrate these screens into a flat-panel-display system.
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Choosing the right display technology
It is common to think that, in the long term, only one display technology will prevail over the others, dominating the world of applications. This scenario might cause designers to reflect about the necessity to migrate to that technology as quickly as a new project comes along. As a consequence, the design might be forced to fit the display, with time and costs implications, rather than the other way round. Bruno Recaldini from Densitron Technologies shows in his article in PN that a variety of display technologies will survive.
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Photodiode amplifier exhibits one-third the output noise of conventional transimpedance amp
A conventional 1-MO transimpedance amplifier has at least 130 nVvHz of output-noise density at room temperature. You can consider the 130 nV as the theoretical noise floor limit of the amplifier because that is the noise density of the 1-MO resistor itself. Any noise in the op amp can only make things worse. Cooling the resistor to 77.2K, the temperature of liquid nitrogen, quiets it to 65 nVvHz, provided that it survives, but is that the only option? Can you beat the 130-nV theoretical noise floor without cooling? The Design Idea by Glen Brisebois from Linear Technologies shows one way of doing this.
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Use a CFL ballast to drive LEDs
Designers use ballast ICs in CFLs (compact fluorescent lamps) for heating the filaments, igniting the lamps, and supplying the lamps with current. This Design Idea by Christian Rausch shows how you can use a CFL-ballast IC for driving LEDs instead of CFLs.
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4| Market Research |
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Camera phones dominate image sensor market
The 2006 image sensor market saw strong growth, due primarily to one application: camera phones, reports In-Stat. In 2006, image sensors for camera phones comprised over three-quarters of all image sensors shipped, the high-tech market research firm says. Fueled by camera phones, CMOS sensors dominated CCDs in units shipped in 2006.
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5|Book of the Month |
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Specialty optical fibers handbook, by Alexis Mendez (Editor) and T. Morse (Editor)
This book is a comprehensive contributed volume that aims to describe and explain the design, fabrication, operating characteristics, and specific applications of the most popular and useful types of specialty optical fibers.
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