I looked up your TV on the Technika website. Your TV only supports a Native Resolution of 1024X768. What resolution are you using with the DVI-HDMI cable? If it's not set at 1024X768 then you are not going to get the best image quality despite the fact that the specs say it can do 1080i, 720p, 576p, 576i, 480p, 480i. All of those resolutions have to be scaled to 1024X768.
http://gdgt.com/technika/lcd19-907/specs/