{"id":48,"date":"2015-09-08T12:17:00","date_gmt":"2015-09-08T12:17:00","guid":{"rendered":"http:\/\/machineryequipmentonline.com\/video-equipment\/uncategorized\/plasma-panelsadaptive-time-compression\/"},"modified":"2015-09-08T12:17:00","modified_gmt":"2015-09-08T12:17:00","slug":"plasma-panelsadaptive-time-compression","status":"publish","type":"post","link":"http:\/\/machineryequipmentonline.com\/video-equipment\/plasma-panelsadaptive-time-compression\/","title":{"rendered":"Plasma panels:Adaptive time compression"},"content":{"rendered":"<div class=\"elimr6a0dc9153fae7\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '61e5902552e2353963d8d2f1bd1f4a8f',\n\t\t'format' : 'iframe',\n\t\t'height' : 250,\n\t\t'width' : 300,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/61e5902552e2353963d8d2f1bd1f4a8f\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.elimr6a0dc9153fae7 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.elimr6a0dc9153fae7 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.elimr6a0dc9153fae7 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.elimr6a0dc9153fae7 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.elimr6a0dc9153fae7 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<h3 align=\"justify\">Adaptive time compression<\/h3>\n<p align=\"justify\">The drawback with time-compressed SF drive is the reduction in panel brightness as a result of reducing the total sustain period of each SF. This is especially significant for darker images. To overcome this, adaptive time-compressed drive is used in which the compression ratio is changed with varying picture brightness. For a bright image, a high compression ratio is used and vice versa for dark images. In this way, images with a low <i>average picture level <\/i>(<i>AP<\/i><i>L<\/i>) have a longer sustain period and increased level of brightness. Figures 10.20 and 10.21 show the scan and sustain wave- forms for low and high APL pictures respectively.  <\/p>\n<h3 align=\"justify\">Sub-field splitting<\/h3>\n<p align=\"justify\">In addition to time-compression, one or two highly weighted SFs may be split into two lower-weighted SFs. With the conventional binary coding, the maximum intensity weighting is provided by SF8 with 128. If this SF was split into two SFs, each with a weighting of 64, then if a false contour described earlier is to take place, the visualised intensity would be greatly  <\/p>\n<p align=\"justify\"><a href=\"http:\/\/lh3.googleusercontent.com\/-k7MkiHedE9k\/VeHZXBkZnyI\/AAAAAAAB4Lk\/U7Kvq2_5uW4\/s1600-h\/Plasma-panels-06122.jpg\"><img decoding=\"async\" loading=\"lazy\" style=\"background-image: none; border-right-width: 0px; margin: 0px auto; padding-left: 0px; padding-right: 0px; display: block; float: none; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"Plasma panels-0612\" border=\"0\" alt=\"Plasma panels-0612\" src=\"http:\/\/lh3.googleusercontent.com\/-cSI7A4CFoWM\/VeHZxAee21I\/AAAAAAAB4N4\/sj-x1cpuQCA\/Plasma-panels-0612_thumb.jpg?imgmax=800\" width=\"366\" height=\"310\" \/><\/a>  <\/p><div class=\"bvfzu6a0dc9153fca4\" ><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-0778475562755157\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- 300x600 television-and-video -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:300px;height:600px\"\n     data-ad-client=\"ca-pub-0778475562755157\"\n     data-ad-slot=\"6549443290\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.bvfzu6a0dc9153fca4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.bvfzu6a0dc9153fca4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.bvfzu6a0dc9153fca4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.bvfzu6a0dc9153fca4 {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.bvfzu6a0dc9153fca4 {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n<div class=\"bbwgo6a0dc9153fbce\" ><script type=\"text\/javascript\">\n\tatOptions = {\n\t\t'key' : '0c1eb4c533eaedb7b996f49a5a4983a9',\n\t\t'format' : 'iframe',\n\t\t'height' : 300,\n\t\t'width' : 160,\n\t\t'params' : {}\n\t};\n<\/script>\n<script type=\"text\/javascript\" src=\"\/\/www.highperformanceformat.com\/0c1eb4c533eaedb7b996f49a5a4983a9\/invoke.js\"><\/script><\/div><style type=\"text\/css\">\r\n@media screen and (min-width: 1201px) {\r\n.bbwgo6a0dc9153fbce {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 993px) and (max-width: 1200px) {\r\n.bbwgo6a0dc9153fbce {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 769px) and (max-width: 992px) {\r\n.bbwgo6a0dc9153fbce {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (min-width: 768px) and (max-width: 768px) {\r\n.bbwgo6a0dc9153fbce {\r\ndisplay: block;\r\n}\r\n}\r\n@media screen and (max-width: 767px) {\r\n.bbwgo6a0dc9153fbce {\r\ndisplay: block;\r\n}\r\n}\r\n<\/style>\r\n\n<p align=\"justify\">reduced to 127 + 64 = 191. In practice, using this SF splitting, nine SFs are employed with a weighting distribution shown in Figure 10.22. SFs corre- sponding to 128 and 64 are divided into four SFs of weighting 48 each and positioned at either end of the SF set. In the figure, the SF with weighting 1 is neglected to reduce the number of SFs and maintain the total level of brightness. The effect of removing the LSB SF is compensated for by an error diffusion circuit.  <\/p>\n<h3 align=\"justify\">Non-binary sub-field coding<\/h3>\n<p align=\"justify\">Non-binary coding is similar to SF splitting in that it removes the very high-weighted SF8 and introduces a larger number of lower-weighted SFs that can be selected for any greyscale level to reduce the effect of false con- tours. Figure 10.23 shows a typical non-binary 12-SF drive system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Adaptive time compression The drawback with time-compressed SF drive is the reduction in panel brightness as a result of reducing the total sustain period of each SF. This is especially significant for darker images. To overcome this, adaptive time-compressed drive is used in which the compression ratio is changed with varying picture brightness. 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