The viewing angles of a screen affect the audience's adequate perception of the content. Therefore, your screen should have a horizontal viewing angle between 120 and 160 degrees and a vertical angle between 120 and 160 degrees .
Viewing angle in LED displays refers to the maximum angle at which the screen can be viewed with acceptable visual performance. In simpler terms ... What is Viewing Angle? · How Does Viewing Angle...
Narrow angle LEDs are used in highway/roadway applications and railways. Like the name suggests, narrow-angle LEDs focus their light in a tight, 30 degree beam.
As for personal use, it is recommended that the tv viewing angle be at 30 to 40 degrees on your field of vision when you're seated for optimal viewing.