Steven is Comsight’s distributor in a major Western country, he won the public bid of a prestigious yet challenging project — to put a over 2700 pixel wide, 25mm pitch LED sign on the headquarter building of the largest national TV network, the sign would be the star of a renovation work to celebrate the networks’ anniversary .
Steven quickly set up an online meeting with Comsight to discuss the project details.Working together smoothly online and by emails, the engineering team of the 2 companies reviewed the architectural and engineering aspects of the project, and defined the challenges:
1)No existing CPU system of Comsight at that time worked with such a long resolution.
2)The customer wanted the sign to attach on the wall closely, then we need design new 7 pixels wide module along with our standard existing 8 pixel wide module.
3)The sign needed a custom made new software to read customer’s data and stream it into scrolling ticker on the sign.
4)The delivery timeframe was very tight and critical.
1)No existing CPU system of Comsight at that time worked with such long resolution
There was no time to develop a new system, so the Comsight engineer had to work on the existing CPU system. Because the longest resolution it worked with is only 1/4 of the total resolution, the engineer used 4 CPU boards, each working with a section of 1/4 of the sign, the real challenge was, the messages must scroll seamlessly across the sign as a circle, so the Comsight engineer developed a special firmware that coordinates the 4 CPU boards precisely as if they were one, the triple CPU system worked as well that no one can tell there are actually 4 CPU boards in the sign.
This system is made up of some parts, following figure show the configuration for whole sign.
Each part is made up of some small signs. For convenient, we make them have a number for each sign.
The first part: A1, A2; the second part: B1 ~ B8; the third part: C;
The fourth part: D1 ~ D3; the fifth part: E1 ~ E3; the sixth part: F1 ~ F15;
The seventh part: G1 ~ G3; the eighth part: H1, H2; the ninth part: I1, I2;
The tenth part: J1 ~ J10; the eleventh part: K.
All signs are divided into three groups as following; one control box controls one group signs.
The first group: 8×938 (GK). It includes the following signs: K, J10 ~ J1, I2, I1, H2, H1, and G3 ~ G1.
The second group: 8×907 (FG). It includes the following signs: F15 ~ F1.
The third group: 8×910 (AF). It includes the following signs: E3 ~ E1, D3 ~ D1, C, B8 ~ B1, A2, A1.
“A, F, G, K” is the corner place of above figure.
2)The customer wanted the sign to attach on the wall closely, which was impossible with the existing 8 pixel wide module;
After a few CAD simulations, Steven’s engineer found that in order to fit the sign perfectly on the building, 7 pixel wide module was necessary; this had introduced 2 challenges to Comsight, first, it had to make mold for a special 7 pixel module in such a short time; second, because the module is such an odd resolution, Comsight had to develop a special firmware for scan card and driver card; all these work had to complete in 3 weeks. Comsight’s mechanical engineer worked together with its molding supplier, created the mold and received the first batch of module bezel in 2 weeks. At the same time, the software engineer completed the new firmware and put the new module into an exhausting test.