The screen door effect is a common problem with virtual reality headsets. It occurs when the pixels in the display become visible, creating a grid-like effect that can be extremely distracting. The cause of the screen door effect is the distance between the display and the eye. The closer the display is to the eye, the more pronounced the effect will be.
There are a few different ways to eliminate the screen door effect. One is to use a higher-resolution display. This will make the pixels less visible and reduce the screen door effect. Another way to reduce the screen door effect is to use a fresnel lens. This lens helps to reduce the distance between the eye and the display, making the pixels less visible. The fresnel lens is a costly addition to a virtual reality headset, but it can dramatically improve the experience.
VR headsets that do not have the screen door effect use either a layer of translucent material or the fresnel lens that enlarges the image so that the pixels are not visible to the human eye. This results in a much crisper and more realistic image that does not have the “screen door” effect.