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Resolution is the ability of a display to show the fine details in
an image. Just as with digital cameras, computer monitors and
similar imaging devices the higher the resolution of your
display, the clearer the image will be. In the same way as
computer monitors resolution is stated in terms of pixels wide
and pixels high. The resolution required for your LED display
depends on the messages or content that you intend to show.
Pixel pitch is the distance from the centre of one pixel to the
centre of an adjacent pixel. The smaller the pitch the closer the
pixels are together. Pixel pitch is important because as the
pitch increases so does the minimum viewing distance. Small
pitch displays (6-10mm) are ideal for interior viewing.
Intermediate pitch displays (30-40mm) are popular for
businesses located on city streets. Large pitch displays
(127mm) are intended to reach motorists travelling at high
speeds on motorways and inter-urban roads.
Character height is the physical height of a letter on the display.
Electronic displays require a minimum of seven pixels to create
the standard alphabet. Therefore, the way to calculate
character height is multiply the pixel pitch by seven. Although
seven pixels high is the minimum vertical resolution to form a
character, you should use more than seven pixels to increase
the viewing distance. Your audience can read larger character
heights from longer distances.
Viewing angle measures readability in typical conditions; beyond
the specified viewing angle, you lose readability. A display
appears the brightest when the viewer is perpendicular to the
display face and diminishes as he or she moves from side to side
or up and down.
For example, a display with 90 degrees horizontal and 40
degrees vertical viewing angle can be read from 45 degrees left
to 45 degrees right, to 20 degrees above and below the display.
So why not choose a sign with the widest possible viewing angle?
Wider viewing angles typically dilute the brightness of your
image. Conversely, narrow viewing angles concentrate the
image’s brightness. When choosing a sign, wide viewing angles
are important for stationary audiences dispersed over a wide
venue such as pedestrians or slow-moving traffic. Narrower
viewing angles are generally appropriate for faster-moving traffic.
Traffic speed, display size, viewing angle and pixel pitch all
influence the amount of time a viewer can see your electronic
display. For example, a sign located near faster traffic must be
larger to attain optimal exposure time.
Audio Visual Terms
LED Tickers and LED Displays