屏幕分辨率是指纵横向上的像素点数，单位是px。屏幕分辨率确定计算机屏幕上显示多少信息的设置，以水平和垂直像素来衡量。就相同大小的屏幕而言，当屏幕分辨率低时（例如 640 x 480），在屏幕上显示的像素少，单个像素尺寸比较大。屏幕分辨率高时（例如 1600 x 1200），在屏幕上显示的像素多，单个像素尺寸比较小。
显示分辨率就是屏幕上显示的像素个数，分辨率160×128的意思是水平方向含有像素数为160个，垂直方向像素数128个。屏幕尺寸一样的情况下，分辨率越高，显示效果就越精细和细腻。
以下是常见分辨率：
| 缩写 | 全称 | 分辨率 | x:y |
| VGA | Video Graphics Array | 640x480 | 4:3 |
| SVGA | Super VGA | 800x600 | 4:3 |
| QVGA | Quarter VGA | 320x240 | 4:3 |
| QQVGA | Quarter-QVGA | 160x120 | 4:3 |
| HQVGA | Half-QVGA | 240x160 | 3:2 |
| WQVGA | Wide QVGA | 400x240 | 15:9 |
| HVGA | Half-size VGA | 480x320 | 3:2 |
| WVGA | Wide VGA | 768x480 | 16:10 |
| FWVGA | Full Wide VGA | 854x480 | 16:9 |
| DVGA | Double-size VGA | 960x640 | 3:2 |
| WSVGA | Wide Super VGA | 1024x576/600 | 16:9 |
| XGA | Extended Graphics Array | 1024x768 | 4:3 |
| WXGA | Wide XGA | 1366x768 | 16:9 |
| XGA+ | Extended Graphics Array Plus | 1152x864 | 4:3 |
| WXGA+ | 1440x900 | 8:5 | |
| SXGA | Super XGA | 1280x1024 | 5:4 |
| SXGA+ | Super Extended Graphics Array Plus | 1400x1050 | 4:3 |
| WSXGA+ | Widescreen Super Extended Graphics Array Plus | 1680x1050 | 16:10 |
| UXGA | Ultra Extended Graphics Array | 1600x1200 | 4:3 |
| WUXGA | Widescreen Ultra Extended Graphics Array | 1920x1200 | 16:10 |
| QWXGA | Quad Wide Extended Graphics Array | 2048x1152 | 16:9 |
| QXGA | Quad Extended Graphics Array | 2048x1536 | 4:3 |
| WQXGA | Wide Quad Extended Graphics Array | 2560x1600 | 16:10 |
| QSXGA | Quad Super Extended Graphics Array | 2560x2048 | 5:4 |
| WQSXGA | Wide Quad Super Extended Graphics Array | 3200x2048 | 25:16 |
| QUXGA | Quad Ultra Extended Graphics Array | 3200x2400 | 4:3 |
| WQUXGA | Wide Quad Ultra Extended Graphics Array | 3840x2400 | 16:10 |
| HXGA | Hexadecatuple Extended Graphics Array | 4096x3072 | 4:3 |
| WHXGA | Wide Hexadecatuple Extended Graphics Array | 5120x3200 | 16:10 |
| HSXGA | Hexadecatuple Super Extended Graphics Array | 5120x4096 | 5:4 |
| WHSXGA | Wide Hexadecatuple Super Extended Graphics Array | 6400x4096 | 25:16 |
| HUXGA | Hexadecatuple Ultra Extended Graphics Array | 6400x4800 | 4:3 |
| WHUXGA | Wide Hexadecatuple Ultra Extended Graphics Array | 7680x4800 | 8:5 |
| HD | high-definition | 1280x720 | 16:9 |
| FHD | Full HD | 1920x1080 | 16:9 |
| nHD | one ninth of a Full HD | 640x360 | 16:9 |
| qHD | one quarter of a Full HD | 960x540 | 16:9 |
| QHD | Quad HD | 2560x1440 | 16:9 |
| WQHD | Wide Quad HD | 2560x1440 | 16:9 |
| UWQHD | Ultra-Wide Quad HD | 3440x1440 | 21:9 |
| QHD+ | 3200x1800 | 16:9 | |
| WQXGA+ | Wide Quad Extended Graphics Array Plus | 3200x1800 | 16:9 |
| 4K UHD | Ultra HD，也叫 UHDTV-1 或 QFHD （Quad Full HD） | 3840x2160 | 16:9 |
| 5K/UHD+ | 5120x2880 | 16:9 | |
| 8K UHD | 7680x4320 | 16:9 |