My Philips Ambilight TV Shows Strong Pixel Lines

I have a 55-inch Philips Ambilight TV, and very noticeable pixel lines appear on the screen. Because of the light reflections, faces are not clearly visible. When I called Philips support, I was told that if it is a defect, a service report could be issued, but if this is simply the product’s quality, then nothing can be done. They also told me that I could pursue my legal rights.