| ??? 07/01/08 16:43 Read: times |
#156346 - Read Again Please =) Responding to: ???'s previous message |
Again, with "alternating rows" or the amount of time a given number of LEDs are on with respect to time. Perhaps my statements were misunderstood? The design in question provides a 60x7 dot (12 matrix) display, 3 colors per dot, with only 5 control lines from the 8051. Power consumption can affect the overall design of a sign. I was able to reduce the original 4-layer PCB to 2, one reason due to smaller traces because the amount a time of the LEDs are switched on. If we examine a defective [indentical] sign we will feel significantly more heat on the PCB in most cases. Why? More LEDs remain on or for a greater period time not as intended, or some similiar fault. The power dissipated is obviously greater. If the designer afford a different design, more power to them! I did not have the option (obsolete design overhaul, retrofit). Of course, brightness is a design trade off much like other issues. It depends on your design goals. In this case, these are "soft" in appearance as intended, and use 3 colors and "shades." There are many ways of accomplishing the same the end but the total power dissipated (and hence current) can be largely relevant! But if had the opportunity for an original design I would have done it differently (and brighter). :) |
| Topic | Author | Date |
| Common cathode dot matrix display and 8051 | 01/01/70 00:00 | |
| Show us your code. | 01/01/70 00:00 | |
| I missed that | 01/01/70 00:00 | |
| Base resister to the PNP? | 01/01/70 00:00 | |
| Details | 01/01/70 00:00 | |
| Output voltage | 01/01/70 00:00 | |
| Video | 01/01/70 00:00 | |
| cause | 01/01/70 00:00 | |
| Easier Way To Do It (Design Experience) | 01/01/70 00:00 | |
| incorrect | 01/01/70 00:00 | |
| It's Correct | 01/01/70 00:00 | |
| nope it is NOT corect | 01/01/70 00:00 | |
| Read Again Please =) | 01/01/70 00:00 | |
that is contradictory | 01/01/70 00:00 |