I have a little better news today. I decided to simply email one Chinese company that sells this 16x8 module. Unfortunately, the only contact is an email for their Marketing director. However, he did provide some usefull information about this.
From his broken English writing, he stated that the following:
As you know, PWM is one way of driving method, but we are not using this method here. What we are using is the static status same current, and our driving method is MBI5024, I send you one specification of MBI5026, which is same serial of the MBI5024.
I then started to use Google to get a better search phrase for "static status same current" and came up with "SPI constant current static LED driver"
This provided some insight that there was another method besides PWM.
Also it appears that the MBI5026 is close enough to the Chinese only version of the MBI5024 datasheet. Here is a link to the MBI5026:
http://www.datasheetcatalog.com/datashe ... 5026.shtml
From reading through it, it appears that controlling the forward voltage (Vf). This is done through Vds that it has a range of 0.4v to 1.0v which keeps the current constant. On the first page it mentions Vf and on page 12 it goes into more detail.
So I need to find a way to only send a changing voltage to a particular pin. This still sounds like a PWM method (e.g. Analog voltage). However, how does one do this via SPI to a particular LED output?
Comments, Ideas are welcome.