well this i don't agree
i have a Hannspree 32" lcd tv which is fine and when looking straight on at the screen the colours doesn't varie at the sides, also on black screens theres only a very very little of the backlight showing..
even when i had a 24" and a 26" monitors both didn't have varieing colours at the sides when looking straight on at the screen, and the backlight bleeding was very unnoticeable
I am talking theoretically here, there is no agreement involved. It is FACT that it happens (I can link you some 3-dimensional vector theory for TN films if you really want, if I can find it online), its just very hard for the human eye to notice these days as they have improved things a lot with the compensation films.
If you move your head from side to side while looking at a TN screen you will notice a very subtle odd colourshift-ey effect. This is because the transmitted light is dependent on the angle you view it at, by moving your head you change the angle you are seeing each individual pixel from, and so the colour shifts slightly.
My point was that the wider the screen gets, the worse the effect will get because the angle you are viewing the pixels on either side of the screen at is much larger than the the angle you are viewing the pixels near the middle, and so the colour shifts more.
But like I said its improved so much these days that its very hard to see as long as you are looking head on and don't move around.