Contrast Ratio of LED Displays
Contrast ratio refers to the degree to which whites can be made brighter and blacks darker on a screen. The higher the contrast ratio, the more vivid the colors and the better the image quality.
White is produced by the light from the LEDs, and black is defined by the color of the surface material of the module. Since true black is difficult to achieve, then white, the overall contrast ratio depends on numerous things. These are LED lamp blackness, material blackness between LEDs, reflectance of surrounding materials, and the amount of external light.

Color Temperature of LED Screens
Color temperature is measured in Kelvin (K) and reflects the color characteristics of light. Higher color temperature (above 5000K) produces a bluish-white cool light, while lower color temperature (2700K–3000K) produces a reddish-yellow to yellowish-white warm light.
The default color temperature for an industry is 7500K, though a few customers have 6500K. With indoor applications, 5000K is used most often as it provides a natural appearance. Power consumption also varies with color temperatures. Western markets have the cultural preference of higher color temperatures (cool light), whereas Asian-Pacific markets prefer lower color temperatures (warm light).

Color Gamut of LED Displays
Color gamut, or color space, is the set of colors that can be generated by a display. It is a subset of all visible colors and is used to portray images on output devices with accuracy. The natural visible spectrum is the widest in terms of color range and contains all the colors visible to the human eye.
Typical LED display color gamuts include NTSC, BT.709, DCI-P3, and BT.2020, which have varying levels of color accuracy and coverage.

Viewing Angles of LED Displays
Viewing angle is the widest viewing angle at which a screen is visible without any distortion of the image or loss of any portion of it. The higher the viewing angle, the more images will remain uniform when viewed from different angles. Within this range, color aberration, black spots, and mosaic effects are minimized so that the image remains smooth and uniform.