1. Understanding Display Resolutions: 4K and Full HD
4K Resolution
Horizontal Orientation (Standard): 3840 x 2160 pixels
Vertical Orientation: 2160 x 3840 pixels
Full HD Resolution
Horizontal Orientation (Standard): 1920 x 1080 pixels
Vertical Orientation: 1080 x 1920 pixels
2. Minimum and Recommended Video Dimensions
For 4K Displays
Minimum Video Resolution:
Horizontal: 1920 x 1080 pixels
Vertical: 1080 x 1920 pixels
Recommended Video Resolution:
Horizontal: 3840 x 2160 pixels
Vertical: 2160 x 3840 pixels
When considering the use of 1080x1920 resolution content on 4K displays, it's important to factor in the real-world viewing conditions of digital signage. In many commercial and public spaces where digital signage is used, viewers typically do not stand close enough to the screen to distinguish the finer details offered by 4K resolution. At a typical viewing distance in such environments, the human eye is unlikely to perceive the difference between 1080p and 4K content. Therefore, using 1080x1920 resolution can be a cost-effective and efficient choice without compromising the perceived visual quality for the audience. This resolution provides a clear and crisp image quality for most signage applications, ensuring that the content is engaging and easily readable even from a distance.
When deciding between 1080p and 4K content for 4K displays in digital signage, the viewing distance plays a pivotal role. As a general guideline, consider opting for full 4K content (3840 x 2160 pixels) when viewers are expected to be within 2 meters (approximately 6.5 feet) of the screen. This close proximity allows viewers to appreciate the enhanced detail and clarity that 4K resolution offers.
For Full HD Displays
Minimum Video Resolution:
Horizontal: 1280 x 720 pixels
Vertical: 720 x 1280 pixels
Recommended Video Resolution:
Horizontal: 1920 x 1080 pixels
Vertical: 1080 x 1920 pixels
3. Aspect Ratio Considerations
The aspect ratio of 16:9 should be maintained to avoid stretching or cropping issues. Ensure that your content is created or edited to fit this ratio, regardless of the resolution.
4. Audio Specifications
Bitrate: For optimal clarity, a bitrate of 320 kbps is recommended.
Format: Common formats like MP3 or AAC are widely supported and recommended for compatibility.
Channels: Stereo (2 channels) is typically sufficient for digital signage. However, consider the environment where the signage will be displayed and adjust accordingly.
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