Some 1080 p movie prints are dull themselves,they are just artificially enhanced to give 1080 p resolution.such movies will play dull and will not give full movie experience. To increase contrast in LG TV you should set energy saving mode to minmum or at off position. Goto setting --picture-energy saving----off,screen will become bright.Try fiddling with other setting as well such as dynamic contrast---max,super resolution ---max etc to get full brightness and contrast on the screen.
Thanks for the reply. As per picture quality of the movies i downloaded, its perfect when i play it on laptop or other old 32inch led tv. I never changed energy saving mode and even after setting picture mode to vivid, its just the same. Colors and brightness are visible but while watching the movie, its like i'm watching a serial as i mentioned before. Movies on hd stb seems to be fine. Only problem i face is when i play it via usb. I will try to download other movies and check once again.
One more thing, i use videocon d2h stb, while hd channels are appearing in full screen, normal channels are not appearing. Even in picture settings, full mode isn't showing on tv. I use manual zoom to fill the screen but its edges are cut off. Is it common in all stb's?