Let's start with the LEDs of the display itself.
From reference photos we can be pretty certain that the Top consists of 20 red vertical rectangular LEDs that are grouped in five sets of four. Now, whether the top 20 LEDs are 20 individual rectangular LEDs isn't clear, however what we can conclude it that it isn't 5 horizontal rectangular LEDs (see animation). However I believe that the Top is a 20 LED lightbar that looks like this
For the Bottom there are 5 red Digit LEDs. Each Digit is made up of Seven rectangular bars that flash ON and OFF individually. The digits have what appears to be a 10 degree angle to them giving them an italic look to them.
Also note that the last Digit on the Bottom is partially covered up by the armor.
Using the above image and scaling it to the dimensions of the 20 LED lightbar (also above), the chest slots for the display should look something like this
Now, lets move on to ESB
The Top sequence is pretty much 100% conclusive being displayed in this animation provided by Art Andrews. This sequence can clearly be seen in ESB during the Carbon Chamber scene.
While the flashing sequence is accurate, the 5 horizontal rectangular LEDs are a bit misleading in the design.
Shown here in this first photo we can clearly make out 4 separate vertical rectangular LEDs that make up one square, so to speak. It also shows us the first sequence for the Bottom Digits.
This bottom sequence is using 4 of the 5 available digits. I cannot tell if the 5th digit is being used, but I speculate it isn’t. In conclusion, this is the first sequence for the Bottom Display
Let's move on to the next available reference photo
Hmmm, tuff call. It is possible that the second Digit has some of the LEDs off, but it's too iffy to tell for certain. This is a common display seen outside of the Torture Room scene in ESB. My only assumption here is that all the Digit LEDs are ON and one thing or another is causing an illusion that some may be OFF. Not very scientific, but hey, what can you do.
Reference Photo No. three
This is a nice photo as to which LEDs are on in each Digit. It appears to be pretty clear. It's hard to make out but it appears that the fifth digit has one LED bar on, that may be the one that is hiding under the armor. My conclusion, is this
Reference photo No. four
This one is a little tricky as it has the white glare covering part of the 4th Digit and the 5th digit. However the rest of the sequence appears to be pretty easily determined
Last but not least reference photo No. 5 for ESB
While similar to Ref photo No. 4, it does have some differences. This one is also very hard to make out since it is so blurry, but this is what I make out
Finally, with no real Reference photo, but using consistency with the Top and the suggestion that 'the lights where OFF or BROKEN during this scene' I give you the sixth sequence
Please note that these are just my interpertaion
Now let's move to ROTJ
Wait, did I say ROTJ? Isn't widely believed that the lights where OFF or not functional during the filming of ROTJ? Well let's put that to rest.
The only Reference photo we have of a 'clear' Bottom sequence for ROTJ is this one
This is a production photo taken (I assume during) the filming of ROTJ. While not conclusive in itself that the lights were ON in the movie, it does give us insight to the 7th and sequence that is known to date. It also proves that at one point, the lights were quite functional at this time. So, without further ado, I give you the 7th sequence
Now let's move on.
Most recently ROTJ had become available on TV in HD for those luckily enough to watch and record it. Art Andrews provided several screen grabs from this HD presentation available here http://www.thedentedhelmet.com/reference/. Upon close, and I mean close examination, I am 100% certain that the lights were in fact on throughout ROTJ. Due to lighting, dim LEDs, short screen time, poor angles, and very little close-ups the lights are near impossible to see. But they can be seen.
I blew up the following photos by 300% and played with the red and magenta hues to bring out the color more. They give zero insight to what is being displayed, but they are enough for me to say that the lights where indeed on, Top & Bottom. Here is what I came up with (All photos are from ROTJ Jabba's Palace, SE shots excluded)
A faint hint of a red glow in the bottom sequence
Fett raises is blaster in response to the thermal detonator (which upons Art's close eye, is just the silver weathering of the armor)
Faintly see the glow of the top Sequence
The original photos are
Rotj_HD_006, Rotj_HD_007, Rotj_HD_016, Rotj_HD_017, Rotj_HD_021, Rotj_HD_022, Rotj_HD_036, feel free to take a look at them yourself.
-Edit Corrected Bad URLs