Help for Monitor dell 3543

I come from Vietnam and I have a question . I just bought a dell Inspiron 3543 laptop a week ago . But when I bought closer examination shows the quality of the display is not sharp . It remains narrow stripes ( " I have contacted the company , but it said that this was not normal and fault " ) . These stripes are very small but quite annoying when I see the video and it is not sharp . I know the screen using HD WLED TrueLife technology . So what is this technology ? I have downloaded and installed the drivers for intel graphics card but not very satisfactory . So someone please explain to me why . I hope the answer from you