High-definition (HD) television refers to video having resolution substantially higher than traditional, standard-definition (SD) television systems. HD has one or two million pixels per frame, roughly five times that of SD.
HD systems are identified with three major parameters:
- Frame size in pixels is defined as number of horizontal pixels × number of vertical pixels, e.g. 1280 × 720 or 1920 × 1080. Often, the number of horizontal pixels is implied from context and is omitted, as in the case of 720p and 1080p.
- Scanning system is identified with the letter p for progressive scanning or i for interlaced scanning.
- Frame rate is identified as the number of video frames per second.
Aircraft-certified High-definition LCD Monitors
Several companies manufacture aircraft-certified high-definition LCD monitors: