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Essential Characteristics for the Quality Images of LED Video Screens
The characteristics below are essential from the point of image quality of LED video screens:
* LED video screen resolution (so called spatial resolution)。 In LED video screens it is closely related to distance between pixels or pitch size;
* Maximum brightness (measured in Nits);
* Dynamic brightness range understood as the number of brightness levels that the LED display screen is capable to support (sometimes it is also called radiometric or energy resolution);
* Frame rate measures how often a video source can feed an entire frame of new data to a display, the frequency of frames changing per second (fps) (sometimes referred to as temporal resolution);
* Refresh rate (measured in Hz) is the number of times in a second that a display hardware draws the data, or refreshes the frame (also referred to as temporal resolution);
* Spectral resolution: Color images distinguish light of different spectra. Multi-spectral images resolve even finer differences of spectrum or wavelength than is needed to reproduce color. The term determines how many spectral components create an image;
* Color uniformity throughout the screen;
* White balance and possibility of fine-tuning it;
* Linear perception of brightness – subjective quality of image quality that determines how the human eye distinguishes between adjacent brightness levels both on dark and bright parts of the screen;
* Image contrast;
* Viewing angle.
Apart from the image quality it is important to consider some key operational parameters of the LED video screen:
* Feedback or monitoring system of screen condition;
* Mature software and comprehensive control system that allow to scaling of the system and construction of LED video screen networks with remote control via the internet through in-built informational security subsystem;
* Level of electromagnetic radiation in the form of electromagnetic interference (EMI) from the screen.