Flat-screen TVs are taking the consumer electronics market by storm; the sales growth rates for advanced” TVs are reminiscent of the early days of personal computers (PCs). The term Advanced TVs now refers to LCD TVs, plasma display TVs (PDP TVs), rear projection micro-display (LCD, DLP and LCoS), front projectors and flat-screen CRT TVs.

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223858615632_Yageo_Ceramic Capacitors

来源:LM317 Electronics Components编辑:Tallysman Wireless时间:2021-06-15 15:34:32

Flat-screen TVs are taking the consumer electronics market by storm; the sales growth rates for advanced” TVs are reminiscent of the early days of personal computers (PCs). The term Advanced TVs now refers to LCD TVs, plasma display TVs (PDP TVs), rear projection micro-display (LCD, DLP and LCoS), front projectors and flat-screen CRT TVs.

Summary

NI-20×0 family of image processors have been designed to bring the digital still camera class of image processing to small form factor, low power, cost-conscious consumer devices without sacrificing image quality, performance or advanced features described earlier. The system designer has a very flexible product to implement still image or video processing applications in a variety of applications.

223858615632_Yageo_Ceramic Capacitors

About the authorMurty Bhavana is the vice president of marketing for Nethra Imaging. He has worked in the semiconductor industry with a focus on graphics, and image and video processing. He holds a bachelor's degree in electronics and communications engineering from National Institute of Technology, Warangal (AP) in India. Murty can be reached at murty@nethra.us.com.

LEDs have been manufactured since the early 1970s, but in recent years advances in this technology have accelerated notably. The maximum available brightness for LEDs has increased by several orders of magnitude, starting with less than 0.01 lumen at 20 mA in the early 1970s and reaching more than 1 lumen now. With these improvements, target applications for LEDs have also broadened significantly. At luminosity levels above 0.3 lumens or so, LEDs start to become practical replacements for incandescent lamps. As such they provide a number of benefits, not the least of which is their great reliability. In general, today's LEDs will long outlive any of the systems in which they are used.

Nowhere is this characteristic more desirable than in automotive systems, where reliability is a matter both of safety and of avoiding expensive repairs. So it is not surprising that the automotive industry has moved relatively quickly to embrace LED technology wherever practicable and is, in fact, driving further innovation in the LED field because of particular automotive requirements.

223858615632_Yageo_Ceramic Capacitors

Evolution of LED brightness Between 1970 and 1995, LEDs evolved gradually to offer higher levels of brightness. Since the mid-1990s, however, the pace of innovation has accelerated, with the invention of blue and white LEDs and a doubling of average brightness for the devices.

223858615632_Yageo_Ceramic Capacitors

Despite these advances, several problems remained, including the fact that the substrate tends to absorb much of the light generated by the LED. Several approaches have been taken to work around this issue. Lumileds, for its part, attacked the problem by using a patented, transparent AlInGaP substrate. Another approach was to add a Bragg reflector grating layer above the substrate. This provides twice the brightness of LEDs with an absorbent substrate, but any light that is emitted at a 90° angle is lost. Vishay has improved on this solution with an organic mirror adhesion (OMA) technology, in which a mirror surface is grown on a silicon substrate. All the light that goes down to the mirror comes out of the front of the device, thus achieving the same level of brightness as is achieved with the transparent substrate approach, for approximately a four-fold improvement over standard LEDs.

LED efficiency LEDs don't just need to be bright; they also need to work efficiently. This means not only converting electric power into light with minimal losses, but also controlling the effect of the heat generated by the current running through the device. A huge challenge of LEDs is that their junction temperature, which goes up when more current is applied, has a direct effect on the wavelength of the light they produce. Simply increasing the forward current can thus merely change the color of the device without making it any brighter. Thus, die and packaging technologies are needed that allow more brightness with less current.

802.11n: This spec evaluates improvements to 802.11 to achieve throughput greater than 100 Mbits/s, which is a natural target, consistent with fast Ethernet speeds.

802.11p: Communications in mobile environments are handled here. The plan is to cover 1 km at 125 mph.

802.11r: This spec covers MAC development to reduce the time associated with the absence of connections. It supports the needs of real-time services, such as VoIP.

802.11s: Protocol development here will enable auto-configuration of access points and paths in multi-hop mesh distribution networks. It'll also support varying traffic types, such as unicast, multicast, broadcast.

802.11t: Here the metrics and test methods are provided to allow measurement and prediction of WLAN systems as a recommended practice. The purpose is to aid in deployment planning, and component and system comparison.

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