Việt1. Screen Resolution
Screen resolution refers to the number of individual pixels (picture elements) displayed on a screen, arranged horizontally and vertically. A higher resolution means more pixels, resulting in a more detailed and sharper image. Screen resolution is typically expressed as width x height (e.g., 1920x1080), where the width is the number of horizontal pixels and the height is the number of vertical pixels.
2. Standard Screen Resolutions
Here are some common screen resolutions and their market names:
| Resolution | Market Name | Description |
|---|---|---|
| 640x480 | VGA | A low resolution commonly found on older monitors and devices. |
| 1280x720 | HD (720p) | Considered High Definition, popular for TVs and online videos. |
| 1920x1080 | Full HD (1080p) | The most prevalent resolution for computer monitors, laptops, and modern TVs. |
| 2560x1440 | QHD or 2K | A higher resolution than Full HD, often seen on premium displays. |
| 3840x2160 | 4K UHD | A very high resolution, common in 4K TVs and monitors for graphics-intensive work. |
| 7680x4320 | 8K UHD | An extremely high resolution, primarily used in large TVs and specialized displays. |
3. Aspect Ratio
Aspect ratio is the proportional relationship between the width and height of a screen or image. It doesn't represent the number of pixels but rather the shape of the display. Common aspect ratios include:
- 4:3 - The classic ratio for CRT monitors and older TVs, often associated with resolutions lower than HD.
- 16:9 - The most common aspect ratio today, found on the majority of HD, Full HD, and 4K monitors and TVs.
- 21:9 - The ultrawide aspect ratio, frequently used in gaming monitors or displays for multitasking.
- 1:1 - A square aspect ratio, popular on social media platforms.
4. Market Names and Acronyms
Different resolutions are often referred to by specific names or acronyms for easier identification:
- HD (High Definition) - Generally refers to the 1280x720 resolution.
- FHD (Full High Definition) - Represents the 1920x1080 resolution.
- QHD (Quad High Definition) - Also known as 2K, referring to the 2560x1440 resolution.
- UHD (Ultra High Definition) - Also known as 4K, denoting the 3840x2160 resolution.
- 8K UHD - The current highest standard resolution at 7680x4320, found in some high-end devices.
5. Browser Viewport
The browser viewport is the visible area of a webpage within a browser window, typically excluding toolbars, menus, and other controls. The viewport's dimensions influence how a website's content is displayed on different devices and change when a user zooms in or out.
In web development, the viewport size is crucial for creating user-friendly layouts across various devices. Concepts like responsive design and media queries are built upon the understanding of viewport dimensions.
Common viewport sizes include:
- Desktop: Typically 1024x768, 1366x768, or larger.
- Mobile: Often around 360x640 or 375x667.
- Tablet: Frequently around 768x1024.
6. Pixels
A pixel is the fundamental building block of a digital image displayed on a screen. Each pixel is a tiny dot that can display a specific color, and when many pixels are combined, they form an image.
In web design and development, a pixel is not just a physical unit but also a logical one. Therefore, the physical size of a pixel can vary across different devices. For example, a display with a resolution of 1440x900 on a 15-inch screen will have a different physical pixel size compared to the same resolution on a 13-inch screen.
DPI (Dots Per Inch) and PPI (Pixels Per Inch) are related concepts that define the pixel density of a screen or device. A higher DPI or PPI indicates a greater concentration of pixels, resulting in a sharper image.
In Summary
Understanding screen resolution, aspect ratio, browser viewport dimensions, and pixels is essential for comprehending how content is displayed across various devices. This knowledge is particularly important in modern user interface (UI) design and development, helping to optimize user experiences across different platforms and devices.