[jbrady3324]

Currently, with my bias light set up, there are some reflections hitting the TV. These reflections are only noticeable if I move about 75 degrees to the left or right of the TV and the screen is show a very dark scene. From the couch you cannot see the reflections at all. The


Is PQ comprised at all from my couch viewing angle because of the off-angle reflections?

 

[robi1138]



Quote:
Originally Posted by jbrady3324 /forum/post/18113054


Currently, with my bias light set up, there are some reflections hitting the TV. These reflections are only noticeable if I move about 75 degrees to the left or right of the TV. From the couch you cannot see the reflections at all.


Is PQ comprised at all from my couch viewing angle because of the off-angle reflections?

If you can't see them, I would imagine not.

 

[Spleen]

Turn off the lights and see if there is a difference.

 

[jbrady3324]



Quote:
Originally Posted by Spleen /forum/post/18113067


Turn off the lights and see if there is a difference.

With the bias lighting off, the screen are no reflections at all from any angle. This is a pitch black room. I love the bias lighting effect, just curious if reflections from extreme side viewing angles makes a negative impact on viewing angles where the reflections are not noticeable at all.


For example (and I am sure most people with bias lighting could notice this if they really wanted to), if I turn on the bias lighting light will shine onto my left and right speakers. If I move to almost 90 degrees to left or right of my TV, I can see the speakers during a very dark scene or when the TV is off.

 

[mattintosh]



Quote:
Originally Posted by jbrady3324 /forum/post/18113081


I love the bias lighting effect, just curious if reflections from extreme side viewing angles makes a negative impact on viewing angles where the reflections are not noticeable at all.

The answer's in the question. I'll explain.


There are two types of reflection--specular ("reflection" in the colloquial, like a mirror) and diffuse ("reflection" over a broad surface). All reflection has both of these components, and except for the miniscule amount of light absorbed by objects, all of it is reflected.


So if a surface produces very specular reflections, it will have very low diffuse reflection and vice versa. If it's 80% specular, it's 20% diffuse, etc.


While diffuse reflection can go unnoticed and mess with brightness and color accuracy (because it doesn't produce a reflected image, it just washes out the screen), specular reflection just annoys you by blocking the underlying image (it has no impact on any part of the TV except where the reflected image appears). If you reposition the TV or yourself so you can't see specular reflections, the problem is gone.


It's the diffuse reflection you have to worry about, but if you can't observe a difference in performance with the light on versus the light off, then there is no problem.

 

[jbrady3324]



Quote:
Originally Posted by mattintosh /forum/post/18113237


The answer's in the question. I'll explain.


There are two types of reflection--specular ("reflection" in the colloquial, like a mirror) and diffuse ("reflection" over a broad surface). All reflection has both of these components, and except for the miniscule amount of light absorbed by objects, all of it is reflected.


So if a surface produces very specular reflections, it will have very low diffuse reflection and vice versa. If it's 80% specular, it's 20% diffuse, etc.


While diffuse reflection can go unnoticed and mess with brightness and color accuracy (because it doesn't produce a reflected image, it just washes out the screen), specular reflection just annoys you by blocking the underlying image (it has no impact on any part of the TV except where the reflected image appears). If you reposition the TV or yourself so you can't see specular reflections, the problem is gone.


It's the diffuse reflection you have to worry about, but if you can't observe a difference in performance with the light on versus the light off, then there is no problem.

Interesting. Thanks for the information. Very helpful. To be honest, I don't think I can observe a difference.

 

[Steve S]

^^^usually it's best to trust your own eyes in cases like this rather than to worry about the unobservable.


If I stand right in front of my rptv and look down toward bottom of the screen I can actually see the light flaring from the projection lens up at the mirror in the back of the set apparently because the screen is actually translucent. I found this disturbing for a while until I noticed that from a normal viewing angle and distance it was totally invisible.


BTW, I use bias lighting with this tv for "serious viewing" and really enjoy the effect.