LED, Pixel and Resolution
LED
LED is an abbreviation for light emitting diode. An LED is a solid-state electronic device that is much more efficient at creating light than an incandescent lamp. LEDs contain chemical compounds that emit light when electric current passes through them. Different chemical compounds emit different colors of light. Unlike incandescent lamps, LEDs have no filaments that can burn out or fail. Yaham uses the highest quality LEDs from the top manufacturers in the world.
What is a pixel?
Pixel is short for picture element. Pixels are points of light that illuminate together to form letters, words, graphics, animation, and video images.
A pixel can be made up of a single LED, multiple LEDs of the same color or multiple LEDs of different colors. A pixel is the smallest element of the electronic display system that can be individually controlled. It can be turned off or on at various brightness levels.
Resolution
Resolution is defined as the number of pixels contained in the physical area of an electronic display. The greater the number of pixels per square foot, the greater the amount of detail displayed. The three examples below show a house with pricing as if it was displayed on electronic message centers from the same distance, with different pixel spacing. Each of these three images represents an electronic display approximately five feet high.
Pixels on 46mm (1.8”) spacing
32 pixels high x 64 pixels wide
44 pixels per square foot
Pixels on 34mm (1.33”) spacing
40 pixels high x 80 pixels wide
82 pixels per square foot
Pixels on 20mm (0.78”) spacing
64 pixels high x 144 pixels wide
230 pixels per square foot
Viewing, Resolution and Color
Text Viewing Ranges (approximate)
Use this table to help determine the approximate character size for a display based on viewing distance or the speed at which the viewer may be traveling.
Shaded areas represent an acceptable exposure time
Yaham Resolution Recommendation Chart (approximate)
Yaham displays have the capability to show text and graphics. Effective use of an electronic display for drive-by traffic must have take into account the speed of the viewer’s vehicle and the viewing distance. The table below can be used to determine the approximate pixel pitch for a display application based on traffic speed and desired display content.
Text and Graphics Recommendation 
Text Only Recommendation
Display Shading and Color
Many Yaham displays show images with depth using shading. These examples show the clarity that can be achieved.
Monochrome 64 shades of red Monochrome 64 shades of amber
RGB 32,768 colors
RGB 68 billion colors
