There is nothing truth about this belief.
The picture clearness of High defintion TV is amplified through more pixels in the stiff space. High defintion TV clarity can be produced in most of the 50 – 63 inch plasma models as they contain that type of room that can fit the numerous pixels. At first, almost all 36 " plasma TVs were not High defintion TV capable. In present time, HDTV resolution can be generated in majority of 42 inch plasma TVs. Actually, in present time, even smaller screens can perform the same. The businesses which has bring forward such TVs are Philips in addition to Sony.
Try to find whether a plasma TV is capable of displaying HDTV resolution before trying to get it. You can check this fact whether or not your plasma is ‘HDTV capable’ only by asking the seller. Buy it only if he claims it is ‘HDTV fitted and not ‘HDTVA fitted HDTV compatible plasma TV suggests that it can receive the HDTV signals but then would demonstrate them in a reduced resolution.
If you desire the impact of HDTV in a plasma TV, And then certify the fact that the plasma display is must have 720 x 1200 or 1024 x 1024.