Originally Posted by DBLASS
Off angle viewing of an LCD is off because of birefringence, which simply put is that lightwave fall out of phase with "the rest of the light waves" at off angle. On TN cells, this causes faded looking image at one extreme and a inverted video image on the other. On symmetrical panels, the display merely fades a bit at off angles. Black should be the blockage of light but at off angles, some light "gets through" and likewise white allows all the colors through but again at off angles, some light frequencies fall out of phase and get blocked. IPS and PVA technologies help correct this phenomena as compared to older TN technologies. Backlighting of an technology will not help this situation unless you can actually turn off the backlight in some of the areas (Dolby active backlights).
Also, concerning light leakage, linear polarizers do not block 100%. Unknown to many, the polarizers of a display are not set the maximum 90 degree opposition but are instead set to about 82 degree since this allows for faster response speed numbers. It is one of those little secrets in the display manufacturing game (plasmas too) to corrupt one performance spec in order to fix or improve another.
I really wish it was easier to discover which type of LCD technology is in the display. I would easily just cross off all TN panels off my list. Somehow the claims of TN viewing angles are much larger than reality. TN has the most narrow sweet spot of any of the VA IPS or TN types.
On a different topic, Directors intend acting, camera angles, lighting, filling and framing the entire lens etc etc. They hardly intend 24fps. Its just what they deal with. "24fps as the director intended" is a laugh line IMO