OK, this was a little tricky, as I don't have LabVIEW 2017 installed anywhere except on a VM at work (installing it wrecked my two Windows 10 machines at home, but the rebuild made them "leaner and meaner", and I've been afraid to install it on my Windows 7 Work PC, hence the VM at work). I renamed <Kanji-Child>VI to Child VI and put it in LED.
Sometimes it is helpful to explain what you are trying to accomplish, otherwise we have to guess. It looks to me like you are trying to make a "Moving Alpha Display Using LEDs", with Child VI taking a string and returning a (vertically)-concatenated 10x11 array of Booleans for a few Roman letters (specifically the letters N, I, R, O, C, K, and S). As Altenbach notes, this is done using two For Loops, one to get a letter at a time, the other to encode one letter -- both can (and probably should) be done in the same loop.
The array that comes out is not easily read, as it goes down. If you output the transpose of the array, you get a more-expected horizontal string of letters (the encoding array has the pixels of the letters "on their side", so transposing things puts the top row of letter pixels in Row 1 (where it belongs) instead of in column 1.
I'm not certain I understand the intent of the main LED routine. Here is where an explanation would be handy.
As LED is written, it calls Child VI once with a specific String, Child VI returns the LED Pixel array, then you "do something" with the returned array. Did you want to be able to start and stop the display? Did you want to be able to display arbitrary text? How did you want to change (or start) the Display? What causes the program to stop?
It is often a good idea to think about what you want your program to do, and to write 3-5 sentences that "tell the story" (no code yet). Once you know what you want to do, you can begin to think "How can I do that in LabVIEW?" , or "in C++", or "in Matlab", or whatever. For example, if you wanted to enter a String and have that be the "new" displayed String, you might think "Ah, how about a Producer/Consumer loop, with the Producer being an Event Structure that "fires" when I enter a String?".
Bob Schor
