I'm going to be taking my plain DW-5600 and 'hopefully' converting the regular display into a negative one with the use of some self-adhesive polarizing film. There have been many questions about where to buy this posted in the various online forums. I bought mine from Polarization.com in Texas. The quality was very good, service excellent, and the shipping was pretty fast (3 days). I ordered the thinnest self-adhesive film they had in a relatively small size, the part name was: Linear Polarizer w/adhesive PFA.
Step 1: Tools Needed
- Plastic tweezers
- Spring bar removal tool
- Small flat head screwdriver
- Some Q-Tips
- A surgical scalpel or sharp modeling knife and fresh blades
- The all important Husky mini screwdriver (a must have item)
Step 2: Removing the Watch Straps
Step 3: Removing the Case Back and Linings
Remove the metal case back carefully, trying not to disturb the rubber gasket that creates the watertight seal around the module.
You should see the rubber spacer that covers and adds protection to the inner module. Remove the rubber spacer using the tweezers for extra grip. It can sometimes feel like it is deliberately stuck to the module but it isn't, it just gets pressed tightly and sticks a bit - it should come off very easily.
Step 4: Taking Out the Module
I took off on a bit of a tangent here and decided to remove the black outer rubber protector and the metal inner ring casing. I also removed the glass screen from the module and spent the next three hours shouting and cursing at how hard it was to put the darn glass screen back in. I was also extremely annoyed at my stupidity as I discovered that it was not necessary to remove the glass at all (I learn as I go along..). I have deliberately omitted the next six or so images that I took of me removing the glass and putting it back in because it is not necessary and very nearly screwed up my display and module!
Step 5: Removing the Factory Polarizing Film
Take your time and work from one edge of the polarizing film across to the other, slowly pushing the blade of your knife under more and more while still moving it from side to side. Eventually you will have the blade under far enough to lift off the polarizing film.
The film is stuck to the glass by a thin layer of tacky glue. It's pretty nasty stuff so be patient and it will come up eventually. Lift off the polarizing film using your plastic tweezers. You can see that the film looks almost transparent while over the display and the digits are only visible on the parts of the display that are covered by the film - it's quite amazing.
Here's where it gets very cool. Simply turn the polarizing film around 90 degrees and as if by magic the digital display becomes reversed! The polarizing film does not need to be in contact with the glass to work.
Step 6: Testing the New Piece of Polarizing Film
Now let's take a look at the digital module display using the new sheet of polarizing film. Here is the display with the film held in the regular position. The display is shown as normal and we can see the module is still ticking away quite happily.
Rotate the polarizing film 90 degrees just like you did with the piece that was removed from the glass and the display is reversed. Excellent, this ensures that the film is going to work - until this point it was a bit of a gamble on whether or not this particular type of polarizing film would work - looks good.
Step 7: Cutting and Replacing the New Polarizing Film
Hold the original piece of film tightly up to the corner of the new sheet and gently cut around it using your sharp knife. Make several slices using medium pressure rather than trying to cut all the way through on the first pass. By making several slices you will avoid slipping and hopefully avoid the loss of any finger tips! Just take your time.
Once you have cut out the new piece of polarizing film, hold it over the display to make sure that it fits and that it will create the desired negative effect. The film used here (details at top) was self-adhesive on one side and had a protective cover on the other. Remove the cover from the self adhesive side and without touching it carefully place the new piece of polarizing film onto the glass screen. Use your tweezers for better precision. Gently rub the polarizing film with a soft cloth or clean Q-Tip to make sure it is adequately stuck down. Then use your tweezers again to lift of the protective cover from the front of the film. You should be left with a smudge and fingerprint free surface.
Step 8: Reassembling the Watch
When the case back is firmly screwed down, flip the whole thing over and admire your handy work, a beautiful, negative display module. Notice how the small box in the upper right corner of the display is no longer visible. This is one difference between the DIY reverse display and the factory fitted version, but I kind of like the minimal look anyway so no great loss for me.
Well that’s it. The hardest part of this whole project was biting the bullet on the polarizing film and waiting the couple of days it took for it to arrive. The rest was relatively easy.
I hope you found this a little bit useful and I also hope this encourages a few of you to pop open that old G-Shock and hack a negative display. It took me a little over four hours to do this, but nearly three of those were spent trying to replace the glass display that I shouldn’t have removed in the first place. There were also some other distractions along the way.
I’ve done my best to provide as much detail as possible, but if you have any additional questions feel free to post a comment here and I’ll do my best to answer it. Happy hacking!