BenQ warm on right side and cool on the left side

[Anrui]

I have a BenQ RL2455HM monitor, and although it displays perfectly normally I touched the screen today and realized that the left side of the monitor is cool to the touch while the right side, particularly the upper right is quite warm. Is this normal?

 

[chris987]

thats normal. dont worry. Distribution of brightness (Uniformity of Luminance) is not equal across panel surface(differs from monitor to monitor), so the brigher the area the higher the temperature. also panel is affected from other monitor components which operate right behind it!