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四川长虹公司自主研制、开发生产的背投彩电已有三代。第一代50Hz普通背投彩电,代表产品有51PT18、51PT28A、43PT28A等。第二代100Hz背投,也称精显系列,代表产品有51PDT18、43PDT18。第三代精显王系列,代表产品有DP5188、DP4388等。长虹第一代背投彩电采用与普通电视机一样的信号处理方式及隔行扫描格式,场频为50Hz。第二代精显系列背投彩电也称倍频背投彩电,其场频是普通背投的一倍,即100Hz。第三代精显王背投彩电为隔行转逐行扫描的变频彩电,其场频为60Hz。精显王背投彩电扫描格式的转换采用了美国nDSP芯片公司研制的非线性数字变频控制技术的隔行转逐行扫描格式芯片电路。将普通彩电场扫描频率由50Hz变频60Hz,每一帧图像由连续的行扫描完成,有效消除了隔行扫描带来的行闪烁、行粗糙、并行等缺陷,提高了图像清晰度。 长虹精显王背投彩电特点 1.长虹精显王背投彩电图像清晰度处理电路采用了多路提高
Sichuan Changhong company independent research and development production of the rear projection TV has three generations. The first generation of 50Hz ordinary rear projection TV, on behalf of the product 51PT18, 51PT28A, 43PT28A and so on. The second generation 100Hz rear projection, also known as fine series, on behalf of the product 51PDT18,43PDT18. The third generation of fine king series, on behalf of the products are DP5188, DP4388 and so on. Changhong first generation rear projection TVs with the same general TV signal processing and interlaced scanning format, field frequency of 50Hz. The second generation of fine series of rear projection color TV, also known as frequency rear projection TV, the field frequency is twice the normal rear projection, that is 100Hz. The third generation of King sharp rear projection color TV for interlaced turn-by-scan frequency conversion color TV, the field frequency of 60Hz. King sharp rear projection TV scanning format conversion using the United States nDSP chip developed by non-linear digital frequency control technology interlaced to progressive scan format chip circuit. The ordinary color TV field scanning frequency from 50Hz frequency 60Hz, each frame image by a continuous line scan to complete, effectively eliminating the interlaced line flicker, line roughness, parallel and other defects, improve the image clarity. Changhong Jing Wang rear projection color TV features 1. Changhong Jing Wang rear projection color TV image sharpness processing circuit with a multi-channel increase