Take the 2-minute tour ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.

I want to know why different colours appear when viewed with a different angle. Can anyone tell me why?

share|improve this question
    
At a fixed voltage, a particular single LED only emits one particular spectrum, see some examples google.cz/… - You may want to be more specific about what you observe, it could have something to do with dispersion (like in rainbow), interference, absorption by a glass surrounding the diodes, reflection etc. etc. or you have some multi-colored diodes. –  Luboš Motl Sep 23 '12 at 8:01
1  
Do you mean an LED, or an LED/LCD display e.g. on a smartphone? LCD displays can change colour because they rely on the spacing of the liquid crystal molecules and this changes when viewed at an angle. –  John Rennie Sep 23 '12 at 9:03
add comment

1 Answer 1

if it is only a LED light,i guess the different color display you cannot distinguish that,because it is very tiny. if you mean LED is a LED screen, that is because when the light pass through the surface,interference and reflection happened. if you mean LED display cannot see it from 2 edge of side,that is because total reflection,so now people begin to develop new LED display,there has a technology called "moth eyes".

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.