Half-SBS means each eye gets 960×1080 pixels (half horizontal resolution). This is a compared to Full-SBS (1920×1080 per eye) or Frame-Packed 3D (Blu-ray standard).
This 1080p Half Side-by-Side (Half-SBS) release of Avengers: Endgame (2019)
In a Half-SBS format, the 3D effect is achieved by placing the left and right eye views next to each other within a single 1920x1080 frame. Resolution: Each eye's view is horizontally squeezed to