no its certainly not an imprint or something... its beneath the glass...
its this interlacing lines shown in the below image which is visible under sunlight when the display is off and also when seen from an angle when display is on..
so am just curious its just mine or its normal thing.. as its bit bugging me since i did'nt noticed it(or was'nt visible enough to be noticed) before on my original purchase..
one i am having currently is the replacement piece (broke the display of previous one

)