When it will go away?Screen Door EffectWith VR era a lot people have noticed that when using VR headset, they’re not only looking like through binoculars, but also notice pattern of black spaces between pixels, so called screen door effect (SDE). When new VR HMDs appear, there is always a talk about SDE and people often confuse SDE with image quality. Let’s talk about what can human eye see, where this effect comes from, when it will go away and what does it mean.
When talking about human eye resolution, we talk about angular resolution and we talk about the smallest thing we can see. It turns out that those with 20/20 vision can see things as small as 1 arc minute. That’s a 0.3mm thick line from 1m distance. And of course, people can have better vision than that, up to 0.6 arcmin. Samsung pentile matrix, used in cell phones Now let’s take a look at cell phone OLED screens, as screens used in VR HMDs are mostly modified cellphone screens. Screen consists of colored dots (sub-pixels) and black space between them. If this black space is at least 1 arc min in our vision, it means it becomes visible to our eye, if we are able to focus correctly. This causes the Screen Door Effect, when we’re able to see the black spaces between pixels.