John, it could be useful to read this description
of what I call Type A and Type B displays.
Type B are definitively different form 2D displays. They have HDMI 1.4 and can understand new 3D formats like Frame Packing, managing the transformation in 3D presentation with their intenal electronics.
Type A are more similar to 2D displays. The main difference is they accept 120Hz in input
. They generally are not able to synchronize the glasses, but a HTPC with nVidia card does it. To achieve 1920x1080@120Hz they need a Dual-Link DVI (or equivalent). These displays (especially LCD monitors) suffer a lot of ghosting.
A 2D display has many features different from a 3D display:
- it hasn't got a HDMI 1.4, so understating Frame Packing of Blu-Ray 3D is ruled out;
- it (generally) doesn't accept a 120Hz input, so systems like nVidia 3D Vison are ruled out.
Even if it accepts a 120Hz input (no idea of which 2D HDTVs have this feature):
- it hasn't got a 297MHz input (like a Dual-Link DVI), so at least 1080p@120Hz is ruled out;
- for 720p/1080i@120Hz it remains the problem of glasses synchronization; 2D HDTV don't have a VESA port or other connection for an emitter, so you should use anyway a HTPC to synchornize the glasses;
- a 2D HDTV, as has been pointed out, is not optimized for 3D (e.g.: black frame insertion for LCD, reduced phosphorus latency for plasma, ...); the result would be a ghosting worst then in Type A displays;
- some problem would probably exist for internal electronics to manage the process, too.
If we want a quality 3D we need a 3D display, otherwise we can always use anaglyph.