Philips 150P2M Electronic User's Manual

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Contents

adjustment of complicated IRQ settings -- for add-on peripherals. USB does away with "portgridlock." Without USB, PCs are normally limited to one printer, two Com port devices (usually amouse and modem), one Enhanced Parallel Port add-on (scanner or video camera, for example), anda joystick. More and more peripherals for multimedia computers come on the market every day.With USB, up to 127 devices can run simultaneously on one computer. USB permits "hot plug-in." No needto shut down, plug in, reboot and run set up to install peripherals. No need to go through the reverseprocess to unplug a device. Bottom line: USB transforms today's "Plug-and-Pray" into true Plug-and-Play!Q: What is a USB hub ?A: A USB hub provides additional connections to the Universal Serial Bus. A hub's upstream portconnects a hub to the host, usually a PC. Multiple downstream ports in a hub allows connection toanother hub or device, such as a USB keyboard, camera or printer.RETURN TO TOP OF THE PAGELCD Panel TechnologyQ: What is Liquid Crystal Display?A: A Liquid Crystal Display (LCD) is an optical device that is commonly used to display ASCIIcharacters and images on digital items such as watches, calculators, portable game consoles etc.LCD is the technology used for displays in notebook and other small computers. Like light-emittingdiode and gas-plasma technologies, LCD allows displays to be much thinner than cathode ray tube(CRT) technology. LCD consumes much less power than LED and gas-display displays becausethey work on the principle of blocking light rather than emitting it.Q: How are LCDs made?A: LCDs are created from two glass plates separated from each other at a distance of a fewmicrons. Plates are filled with liquid crystal, then seals together. The top plate is colored with a RGBpattern to make the color filter. Then polarizers are glued to both plates. This combination issometimes called "glass" or "cell." The LCD cell is assembled into a "module" by adding thebacklight, driver electronics and frame.Q: What is polarization ?A: Polarization is basically directing light to shine in one direction. Light is electromagnetic wave.Electric and magnetic fields oscillate in a direction perpendicular to the propagation of the lightbeam. The direction of these fields is called "polarization direction." Normal or non-polarized lighthas fields in several directions; polarized light has a field in only one direction.FAQs (Frequently Asked Questions)file:///D|/Grace/150P2/english/150p2m/safety/saf_faq.htm (5 of 8) [9/5/2001 11:09:19 AM]