During project creation, the images look sharper than on DVD on the TV.
Solution:
This is not an error. A DVD only has a relatively low resolution of 720x576 pixels. On a TV that has a higher resolution, a DVD may therefore look blurry. Instead, burn a Blu-ray with HD resolution (1920x1080) or output a video with HD resolution and play it on your TV, e.g. via USB stick. See also Create video.