Valve’s New Patent Application Shows How They’ll Be Mitigating The Screen Door Effect On VR Headsets
Valve may have solved the problem to screen-door effects on head mounted displays according to the new submitted patent application by the company.
Thanks to Reddit user u_cap, we can see how Valve will dispose a phase optic between the HMD lens and user’s eye to change the distribution of the light so the user’s eye cannot focus the light better than the sub-pixel distance. This will make the user unable to resolve the sub-pixel structure and make the structure appear as one larger pixel, mitigating the screen-door effect.
According to the document, “a significant reduction in screen-door effect visual artifacts arising from the periodic structure of the display panel may therefore be obtained.” You can see in the image above how the phase optic will be placed in front of the lens, closer to your eye.
In the document, it also quotes, “Ordinary skilled artisans will recognize that placing a phase optic such as item 130 in the collimated space would be considered to be counter-intuitive technique for mitigating screen-door effect visual artifacts. In certain embodiments for use in HMD applications, the resolution of display 110 as shown in FIG. 1 (above image) is 1200 x 1100 pixels, and the field of view is approximately 110 degrees.
The screen door effect has been one of the big hurdles in the VR space and its apparent that companies such as Valve are working towards solving the problem. It is unclear if this technology will be present in the HTC Vive Pro when it finally releases. The technology might be used in the upcoming LG VR headset.
You can read Valve’s full patent application for mitigating the screen door effect here.