QHD (Quad HD), WQHD (Wide Quad HD), or 1440p, is a display resolution of 2560 × 1440 pixels in a 16:9 aspect ratio. The name QHD reflects the fact that it has four times as many pixels as HD (720p). It is also commonly called WQHD, to emphasize it being a wide resolution, although that is technically unnecessary, since the HD resolutions are all wide. One advantage of using "WQHD" is avoiding confusion with qHD with a small q (960 × 540).
This resolution was under consideration by the ATSC in the late 1980s to become the standard HDTV format, because it is exactly 4 times the width and 3 times the height of VGA, which has the same number of lines as NTSC signals at the SDTV 4:3 aspect ratio. Pragmatic technical constraints made them choose the now well-known 16:9 formats with twice (HD) and thrice (FHD) the VGA width instead.
In October 2006, Chi Mei Optoelectronics (CMO) announced a 47-inch 1440p LCD panel to be released in Q2 2007; the panel was planned to finally debut at FPD International 2008 in a form of autostereoscopic 3D display. As of the end of 2013, monitors with this resolution are becoming more common.
The resolution is also used in portable devices. In September 2012, Samsung announced the Series 9 WQHD laptop with a 13-inch 2560 × 1440 display. In August 2013, LG announced a 5.5-inch QHD smartphone display, which was used in the LG G3. In October 2013 Vivo announced a smartphone with a 2560 × 1440 display. Other phone manufacturers followed in 2014, such as Samsung with the Galaxy Note 4, and Google and Motorola with the Nexus 6 smartphone. By the mid-2010s, it was a common resolution among flagship phones such as the HTC 10, the Lumia 950, and the Galaxy S6 and S7.