i think it has everything to do with the type of font used.
because my television can display text that is tiny without a problem if cable broadcast shows it.
but i find the text problematic at 1080i when connected to the computer.
one place to start is 'cleartype'
i think there is anti-aliasing information that isnt being transferred to the television.
or perhaps there IS anti-aliasing information being sent to the television, and that is what is causing the distortion.http://www.microsoft.com/typography/cleartype/tuner/step1.aspx
the above link begins to show a difference and supports what i am talking about.