LED displays are today an integral part of contemporary visual communication, from indoor business signage to large outdoor billboards. Three key parameters — brightness, grayscale, and refresh rate — have a direct influence on the performance and viewing experience of an LED display. Familiarity with these parameters can help users choose a suitable LED display for specific applications.

Brightness of LED display
The brightness of LED display is usually expressed in a numerical unit "Nits" or cd/m2. the larger the value of Nits, the higher the brightness of the LED screen. the higher the brightness of the LED display, the longer the viewing distance. The brightness depends mainly on the quality of the chip of the LED lamp, the lower the scan the higher the brightness. Generally speaking, for LED display used in indoor, the brightness requirement is 800-2000CD/m2, if semi-indoor, the requirement is >2000CD/m2, semi-outdoor (non-direct sunlight) requirement is >4500CD/m2, outdoor (direct sunlight) requirement is ≥5000CD/m2.

Grayscale of LED display
The unit of grayscale level is bit, grayscale is also known as the color scale, refers to the brightness of the degree of light and darkness. Generally speaking, the higher the grayscale, the richer the color of the display, and the more detailed the picture. Detection method: The color gradation of the display will become visible at low brightness (It can be observed in the process of adjusting low gray to high brightness by software). Generally speaking, LED display industry gray level up to 16bit (65536, that is, 2 of the 16th power level gray).

LED display refresh frequency
LED display refresh frequency is the number of times the display screen is displayed repeatedly, the unit is Hertz (Hz). The higher the refresh frequency, the smaller the flicker of the image on the screen, the higher the stability. Input signal source commonly known as refresh frame rate, generally in the 60-240Hz, LED display refresh frame rate in the 1920-7680Hz. Refresh rate in Hertz (Hz), it is equal to the number of frames divided by the time (S), for example, 120 Hertz means that 1 second to display 120 times the screen. When the frequency of frame repetition is not high enough, the human eye will feel flickering, there is a sense of disconnection (e.g., the camera against the LED screen). The human eye to watch the low light refresh rate must not be less than 240Hz, high light must be higher than 400Hz (currently the general brush is 1920Hz, high brush is 3840Hz). The driver IC determines the refresh rate. The lower the scan, the higher the refresh.

Three principal parameters that determine the quality of an LED display are brightness, grayscale, and refresh rate. Higher brightness gives visibility in any condition, color richness is managed by grayscale, and a higher refresh rate decreases flickering to have a more stable image. Having knowledge about these parameters allows users to select the correct option when selecting an LED display for their specific requirement.