A 16:9 grid of 1920×1080 square pixels holds exactly 2,073,600 samples. The number 1080 counts the active vertical lines. It does not count the width.
Every line is drawn in order on every frame. That is progressive scan. 1080 Interlaced (1080i) keeps the same sample count and sends the odd lines and the even lines as two fields. The marketing name for the progressive grid is Full High Definition (FHD). Broadcast High Definition (HD) was often 1080i or 720 Progressive (720p). Later export and streaming defaults moved to the progressive frame. When a computer display or a phone says 1080p, it means this grid.
Progressive Scan Versus Interlace
Interlace is a time split, not a smaller picture. Each field carries only half the lines, and the two fields alternate. A display has to deinterlace those fields before it can show one still frame. Progressive video is already the full frame, so that repair is skipped.
- Full frame. Progressive scan places all 1080 lines in one frame, in order from top to bottom. Moving edges stay on a single time sample.
- Two fields. 1080i alternates a field of odd lines with a field of even lines. If the subject moved between the fields, a paused frame shows horizontal combing.
- No deinterlacer. The progressive frame was never split, so playback does not have to guess how two fields fit together.
The same field split was normal in Standard Definition (SD). National Television System Committee (NTSC) countries used 480 Interlaced (480i), typically 720×480. Phase Alternating Line (PAL) countries used 576 Interlaced (576i), typically 720×576. 480 Progressive (480p) and 576 Progressive (576p) keep those line counts and draw them as full frames.
Frame Rates and the Pixel Grid
The stored grid stays 1920×1080 at every speed. Speed is counted in Frames Per Second (FPS).
- Film. 23.976 or 24. The fractional rate is 24 divided by 1.001.
- PAL timing. 25 in PAL countries, or 50 when a new frame arrives twice as often.
- NTSC timing. 29.97 or 30, and the faster pair 59.94 or 60. The figure 29.97 is 30 divided by 1.001, and 59.94 is 60 divided by 1.001, which keeps the picture aligned with NTSC color timing.
720p is a 1280×720 grid, 921,600 pixels. Each axis here is 1.5 times that grid: 1920/1280 = 1.5 and 1080/720 = 1.5. Area scales by 1.5 × 1.5, so 2,073,600 is 2.25 times 921,600. A common mistake treats 1080p as four times 720p. It is 2.25 times the pixel count, not four times. The fourfold step is the next size. 2160 Progressive (2160p) is 3840×2160, or 8,294,400 pixels, exactly four times this grid.
A set labeled High Definition Television (HDTV) often received 1080i or 720p rather than a progressive 1080-line frame. The path into a display is commonly High-Definition Multimedia Interface (HDMI). A phone and a living-room screen can share this sample count at very different Pixels Per Inch (PPI). Density changes with the panel size. The number of samples does not.
Red Green Blue (RGB) is one way to store each sample. High Dynamic Range (HDR) and Standard Dynamic Range (SDR) describe brightness range. Neither choice changes 1920×1080. The Society of Motion Picture and Television Engineers (SMPTE) production raster for this frame size is that same grid, progressive or interlaced.
Where It Sits Among Other Modes
Quad High Definition (QHD) is another name for 1440 Progressive (1440p), a 2560×1440 grid of 3,686,400 pixels. Quad means four times 720p, because both axes are doubled from 1280×720. It is about 1.78 times this grid, not four times 1080p. Ultra High Definition (UHD) at 3840×2160 is 2160p, also called Ultra High Definition (4K) because 3840 is near 4,000 samples across. That area is exactly four times 2,073,600. 4320 Progressive (4320p) is 7680×4320, sixteen times this grid, and the rounded width is marketed as 8,000 Pixels (8K).
Rates below are the common ones for each rung, not every timing a display can accept. Interlaced rows are given as field rates. Two fields make one frame.
| Mode | Typical Pixels | Scan | Usual Rate |
| 480i | 720×480 | Interlaced | 59.94 fields |
| 480p | 720×480 | Progressive | 59.94 frames |
| 576i | 720×576 | Interlaced | 50 fields |
| 576p | 720×576 | Progressive | 50 frames |
| 720p | 1280×720 | Progressive | 50, 59.94, or 60 frames |
| 1080i | 1920×1080 | Interlaced | 50 or 59.94 fields |
| 1080p | 1920×1080 | Progressive | 23.976 to 60 frames |
| 1440p | 2560×1440 | Progressive | Often 60 frames |
| 2160p | 3840×2160 | Progressive | 24 to 60 frames |
| 4320p | 7680×4320 | Progressive | 24 to 60 frames |
