QHD+ (Quad HD Plus): what it is, how it works and what it does
QHD+ is a screen resolution offering higher pixel density than standard QHD, designed to enhance visual sharpness on mobile devices.
Definition and Principles
QHD+, or Quad HD Plus, is a screen resolution specification primarily used in mobile devices. It is defined as a variation of the standard QHD resolution (2560 x 1440 pixels) that incorporates additional pixels, typically at the top and bottom edges, to accommodate taller aspect ratios (such as 19:9 or 20:9).
The fundamental principle of QHD+ is to increase pixel density (PPI) without significantly changing the screen diagonal, resulting in a sharper and more detailed image. Unlike standard QHD, which maintains a 16:9 aspect ratio, QHD+ modifies the pixel matrix geometry to maximize the usable viewing area in vertical formats.
Architecture and Functioning
The architecture of a QHD+ screen involves a non-uniform pixel matrix relative to 16:9 standards. While a standard QHD screen has 2560 pixels of width by 1440 in height, a QHD+ screen usually presents dimensions such as 2400 x 1080 or 3200 x 1440, depending on the manufacturer and specific aspect ratio.
- Aspect Ratio: Optimized for vertical content and multitasking.
- Pixel Density: Higher than FHD+ and comparable to or higher than standard QHD on similar diagonals.
- Compatibility: Requires content scaling to adapt to non-standard proportions.
Applications and Scope
This resolution is common in high-end and upper-mid-range smartphones. Its presence indicates a focus on visual quality for media consumption, gaming, and productivity. Evidence shows its use in 6.8-inch AMOLED displays, highlighting the ability to offer vivid and sharp images.
Limitations
The main challenge of QHD+ is power management. Having more active pixels than FHD+, battery consumption can be higher. Additionally, non-native multimedia content in these proportions may require black bars or scaling, which can affect the visual experience if not properly optimized.
Interpretation in Products
When finding the QHD+ label on a product, it should be interpreted as a promise of greater sharpness than Full HD resolutions. It is not a universally standardized resolution with fixed dimensions, so exact pixel specifications may vary between manufacturers. The combination with technologies like AMOLED and adaptive refresh rates suggests an immersive and fluid visual experience.
The presence of QHD+ on a 6.8-inch screen with adaptive refresh indicates a balance between high resolution and energy efficiency for an immersive visual experience.