defective display

I initially thought it was a stuck green subpixel until I took some close-up shots. This is a black screen and shows that the green subpixel is lit up This picture specifically shows that the subpixel is not fully lit up. This is a white screen. The stuck green subpixel is barely lit up so...

I recently purchased a laptop with a 4k display from a large online retailer in the UK. I believe the display to be defective as when scrolling, text will appear very blurry when scrolling, suggesting very poor response times etc. The effect is particularly pronounced when in Windows Night Mode...