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Inversed LCD has brown background instead of black...

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  • Inversed LCD has brown background instead of black...

    Arby, or anyone else, I have the Timeline 40x4 backlit LCD and I'm using the polarizing film from www.polarization.com. I rotated the film until it was a very dark purple and then I cut a piece and placed it in the LCD. I am using a 2 ohm resistor for the backlight because I couldn't find a potentiometer. When I turn on the LCD at night, the yellow text is very bright, but the background is a light brown behind it instead of black. Is this because I did not rotate the film correctly or could it be because I have the backlight turned up to its max brightness? Any help is appreciated.

  • #2
    You might nt have rotated the film correctly, or it could just be the type of film it is....

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    • #3
      Well gee, such helpful advice.

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      • #4
        The light backgroudn is NOT the film. I think it's bc the LCD backlight is at it's brightest. Mine is like that also...just turn down the brightness control if you got one and then you should get it completely black.
        04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

        Fast car, fast PC. ;)

        http://www.arcdesigns.net/carpc/

        My TL CarPC ver2

        FSR Flash Skin w/ moving weather maps

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        • #5
          I've actually taken inversing to the next step...

          The film that comes attached to these LCDs is fairly poor quality. If you take the piece that came on the front, and cut it so you can test it against itself. You'll notice that it is impossible to make it opaque black.
          Also, the LCD glass has a certain ammount of polarizing properties, and it becomes impossible to get the film to show as dark as possible with the glass in between it.

          The film which I purchased from Arby was much higher quality, and I could get an almost opaque purple with the perfect ammount of rotation (of course it wasn't quite as dark when the glass was between it).

          I then realized that the piece of film on the BACK of the glass was also the same poor-quality stuff. I carefully removed this piece. I then cut the film which I received from Arby, and replaced both the FRONT and BACK. The result is a much darker display with nice bright characters.

          The only downfall is that I have noticed a slight inconsistency on the black background of some characters, but I don't know if this is related to the film or maybe some damage that was inflicted during the inversing operation.

          -Miles

          [ 11-05-2001: Message edited by: milesg ]
          Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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          • #6
            So, it is the film??

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            • #7
              Well, it's a combo of the film that comes with the LCD and the polarizing properties of the glass.

              Upon re-assembly of my LCD with the "double-inversion", I've noticed some very odd artifacts on the display. I believe this is some kind of interference of each character space with the others adjacent to it when lit.

              Basically, I see a light flicker on text which is below the spectrum analyzer. It can make it very hard to read the other information, however, I believe that this is only an occurance which is now perceptible when viewing the panel with a high contrast setup like "invertion". I've returned my LCD to the un-inverted state, and these "artifacts" seemed to disappear


              My question is this:
              Do Arby's pre-inverted LCDs have this wierd flicker? and is a perfect opaque black inversion?

              I can't imagine that it is, since I purchased the same film that he uses (from him), and I can't even get a very dark black with both sides replaced.

              The pain is tremendous

              -Miles
              Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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              • #8
                All i have to say is that during daytime, inversed LCD's SUCK!!! I can barely see anything and the lcd turns into a purplish ugly color
                04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

                Fast car, fast PC. ;)

                http://www.arcdesigns.net/carpc/

                My TL CarPC ver2

                FSR Flash Skin w/ moving weather maps

                Comment


                • #9
                  Well, after attaching a rheostat (same as potentiometer basically) to the LCD's backlight and turning it down, the background is still a brown color and not black. Has anyone found a polarizing film which will inverse an LCD's background to black yet leave the character parts nice and bright?

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                  • #10
                    It turned out that I had just clamped the front cover down too tight, and that was causing the wierd distortion... With the film I got from Arby on both side of the glass, I have an almost completely black background and nice bright characters... it's a kinda trickey process, but it's well worth it IMO

                    Now I just need to get rid of these damn invered "P"s.

                    -Miles
                    Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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                    • #11
                      So remove and replace the film on the inside cover of the lcd glass also?
                      Wow I'm not so sure I want to attempt that!

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                      • #12
                        > Now I just need to get rid of these damn invered "P"s.

                        Ha Ha! You knocked one of the rubber strips loose, didn't ya! I feel your pain. It's surprising how much abuse those displays can take while a stark-raving mad owner tries to fix it...
                        http://www.jeepmp3.com/
                        CarPC Stolen. Starting over.
                        Ne1 recognize the avatar?

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                        • #13
                          Also, another thing to add, the densitron lcd suck for inversing. The EIO ones worked much better.
                          www.arbybean.com

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                          • #14
                            My 40x4 LCD has been exhibiting a strange symptom lately. Normally, on short rides, it is fine...the display is readable. But recently, after driving for 2 hours using it, it seems as if the longer the LCD is on, the more the contrast increases!!??
                            For example, I have my contrast pin tied to ground without a pot, and it seemed to be great for short trips and such. But after driving for 2 hours the LCD was barely readable any longer without looking at it from an extreme angle. Anyone know anything about this??

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                            • #15
                              SuperMatty: Some times the liquid crystal inside of these has very low temperature ranges which it will function properly under. If the LCD is getting warm (or very cold??), the polarizing properties of that crystal can change... Make sure you don't have the backlight on too bright (hot).
                              I contacted Densitron about the High-temp range crystal, but they weren't interested in selling a small quantity to me . They also have pre-inversed models and ones with red back lights... Maybe if we get 1,000 people who need Red-inversed-hightemp LCDs we can order some... until then, we're stuck with the ones from Timeline.

                              PatO: I was getting those "P"s even before I tried to inverse it... It's gotta be some kind of software thing, because it only happens when I'm using certain plugins for Winamp.

                              -Miles
                              Near Completion: Intel P166 MMX, 32MB ram, 13GB Hard Drive, Keypad, 4x40 LCD. Sproggy MK2.6 ATX PSU. Win98SE with Winamp and Mark Zehnder Plugin. (Web-site: very soon)

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