PC World Plus! (NZ) 2001 October

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Text File | 2001-05-22 | 5KB | 131 lines

rleJ<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="description" content="How a television screen produces a picture"> <meta name="keywords" content="television, screen, tube, electron beam, electricity, light, primary colours, magnetism, electrons"> <meta name="GENERATOR" content="Microsoft FrontPage Express 2.0"> <title>TeMlevision</title> </head> <body background="images/backing.jpg" bgcolor="#F√ " text="#0√"> <form method="POST"> ²*<a name="top"></a> ² ²9TELEVISION ²SCREENS ²:The inside ²:front of a television tube is coated with chemicals that ²9react by emitting a spot of light when hit by a beam of ²<electrons. Electrons are fired from an electron gun at the ²>rear of the tube. The electron beam is deflected by magnetic ²?coils placed between the gun and the front of the screen. The ²A<a href="#magnetic">magnetic ²?field</a> generated by the ²?coils is varied in a repeating pattern over time, so that the ²;magnetically guided beam sweeps across the screen surface ²;from left to right and top to bottom. The whole screen is ²?traced by the beam in this way 50 times every second. This is ²:so fast that to the human eye it appears as if the whole ²;screen is lit up at once. By varying the intensity of the ²=beam (based on the incoming television signal) as it traces ²>the area of screen, the amount of light being emitted by the ²=screen chemicals varies, tracing out a picture of light and ²dark. ²/<div align="center"><center><table border="1" ².cellpadding="10" cellspacing="0" width="500" ²)bgcolor="#C0C0C0" bordercolor="#C0C0C0" ²7bordercolordark="#C0C0C0" bordercolorlight="#808080"> ∙<tr> ⌡<td colspan="2" bgcolor="#0√ ">COLOUR ⌡IMAGE</td> ∙</tr> ∙<tr> ⌡0<td><img src="rgb.jpg" alt="RGB light diagram" ⌡ width="187" height="256"></td> ⌡<td bgcolor="#F■%3C6">To ⌡5produce a colour image a television tube surface is ⌡0coated in thousands of finely placed groups of ⌡4chemical spots. Each group contains three spots of ⌡3different chemicals designed to emit red green and blue light. There are three ⌡6separate electron guns at the rear of the tube, each ⌡4focused in such a way that the electron beams from ⌡5one gun can only strike red emitting spots, one for ⌡7green spots and one for blue. The red, green and blue ⌡7spots in a group are so close to each other that they ⌡3appear to be at the same point. As red, green and ⌡2blue are the <a href="example2.htm">primary colours of ⌡8light</a>, ⌡7varying the intensity of the three beams striking the ⌡>chemicals on the screen can produce any colour. </td> ∙</tr> ² </table> ²-</center></div> ² ²<Request more ²,information on <select name="D1" size="1"> ∙<option selected>Choose one.■</option> ∙<option>Electricity</option> ∙<option>Magnetism</option> ∙<option>Light</option> ²</select> ²?<div align="center"><center><table border="1" cellpadding="0" ²/cellspacing="0" width="300" bgcolor="#008080" ²bordercolor="#00F²" bordercolordark="#00F²" ²bordercolorlight="#0√"> ∙<tr> ⌡8<td>Name ⌡ ⌡4<input type="text" size="45" name="T1"> ⌡</td> ∙</tr> ∙<tr> ⌡9<td>Email ⌡ ⌡4<input type="text" size="45" name="T2"> ⌡</td> ∙</tr> ² </table> ²7</center></div><input type="submit" ²>name="B1" value="Send request"><input type="reset" name="B2" ²value="Clear"> ² ² ² ² ²5<a name="magnetic">-ⁿ Note -ⁿ</a> ²9Electrons ²3passing through magnetic field lines of force ²:are deflected from their original path by the field. ²N<a href="#top">Back to top</a> ² ² ² ² ² ²;Example web ²page ⌐20■ ²8 </form> </body> </html>