You can build your LED signboard by the Modules.
Modules specification as following:
Usage: Window / Outdoor
Module Size: 12 in. X 12 in / 1ft x 1ft / 304.8mm X 304.8 mm
Module Type: Housing
Pixel Configuration: Red / Green / Red & Blue / Red & White / Red & Green & Blue
Pixel Pitch: 19 mm
Module Resolution: 16 X 16 dots
No. Of Lamps (Per Module): 512 (two lamps in a pixel), 768 (tree lamps in a pixel)
Brightness: 3, 500 CD/m²
Brightness Grades: 10 (different levels of grade applicable during daytime and nighttime)
LED Lifespan: 100, 000 hours ( about 10 years)
Viewing Angle: 60 ° Horizontal
Memory Storage: Up to 12, 800 letters, graphics, or icons
Input Power: AC 120V or 220V
Output Power: DC 5V, 5.0A
Power Consumption (Per Module): 9 watts
Operating Temperature: -13 ° F to 110 ° F
Controller: I. R Remote / USB
Text Lines: Single or Double
Automatic Display On/Off
Message Reserve: Displays specific messages during desired time period
Date & Time countdown display
Current Time & Temperature display (Option)
Display Direction: Horizontal or Vertical
32Column in Max for I. R. Remote / 16Column in Max for USB