It is an image bleed and a defect of many tvs....but most japanese manufacturers wont admit it to save money on recalls.
My tv has a ghosting line for about an inch from the end in HD mode....
Also, interesting to note, that your tv is probably HD lite, or HD superlite....
Meaning, for the japanese to push product....they lie
True HD is 1920x1080p
HD lite(what is usually broadcasted) is 1920x1080 i which is just a strecthed out version of 720p
And then there is HD superlite(what the tv actually displays) which is 1280x720
Pretty bad ripoff....huh......
The only a few true HD tvs out on the market...
NOTABLY
The apple 23-inch cinema display and....
The apple 30-inch cinema dispaly
Their resolutions actually meet or exceed HD specifications...