LED diode density and pixel pitch are the two most critical factors to determine the quality of resolution and display brightness. LED density of a display is the total number of LED diodes in one square meter. It is calculated by multiplying the number of pixels per square meter by the number of LED diodes per pixel.

Signs Plus LED display systems have always featured more LEDs per pixel than other LED display manufacturers. Our higher LED diode density provides significantly higher brightness and longer display life since each individual diode can be driven at lower levels of intensity, reserving capacity to extend the display’s life - without sacrificing proper viewing brightness.
 

Virtual Pixel vs True Pixel Some LED display manufacturers use "virtual pixel" technology. They claim that "virtual pixel" doubles the actual resolution of screen, i.e., a screen with a physical (true) resolution of 320x240 pixels in reality is expressed as the "virtual" resolution of 640x480.  In a “Virtual Pixel” Display in an attempt to smooth out digital image, each pixel of the image corresponds not to an actual module pixel but to a light/data source, that is part of the group of pixels that form the “Virtual pixel”. By this mode of pixel sharing one pixel contains the “Virtual group”* of pixels image information. *(The 2 or 4 pixels that are combined to form the “Virtual” effect). Virtual pixels are also known as “pixel sharing” or “dynamic pixels”. Some claim that with “virtual pixels” the displayed image has twice the resolution as the “physical” resolution. This is not true, since one module pixel cannot memorize or hold and display the majority of information from the initial pixel. The majority of the original information vanishes. This results in distortion of important details and other elements such as colors that are part of the initial image. In the actual, physical or true pixel technology, the image is displayed on a display in as each pixel of the original image corresponds to pixel on a screen. It takes the actual color in a pixel as it is balanced in brightness and contrast and no additional corrections are required. Optec Media only uses true pixel technology.

VIRTUAL PIXEL Uses pixel sharing to achieve “virtual” pitch. Attempts to achieve equal resolution using 1/4 the diodes of a true pixel display. TRUE PIXEL Each pixel is distinct, using individual groups of LEDs. Display has 4x the diode density of a virtual pitch, resulting in 4x brightness, greater color depth and better color accuracy.