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Thread: 2002 Mitsubishi Magna VR-X - 15.4" ultrabright LCD, fabricating...

  1. #121
    Wants to make it harder monkeyracer's Avatar
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    I was thinking along the same lines as you were. The white in my opinion is absorbing some of the light (diffusing) where as the natural aluminum is reflecting it and aiming it toward the screen's diffuser. I think it would be worth setting up a scale test: make two small boxes, one painted white the other naked aluminum. Place an equal power led array in each, and cover the box with something that might resemble the screen diffuser. Then sit them side by side, and turn it on. The one that looks brighter wins.

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  2. #122
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    if your theory was correct, then why do all lcd manufactures use a reflective white sheet instead of a mirrored finish? all lcd's from every manufacturer uses a white reflector sheet, I have never seen even one that uses anything but, I'm sure they spend big bucks on r&d & testing for best results....

    I did find some reference material supporting this white reflector, but long ago, have no idea where I seen it now, but white is the way to go in my opinion

  3. #123
    Wants to make it harder monkeyracer's Avatar
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    I was just doing a little research on light boxes, and I change my mind, every lightbox that I found used white, not off-white, not ecru, not mirrors, but white. I think it would still be worth the effort to make a couple simple lightboxes to see visual results.

    oh, and school busses used to use white roofs to reflect the sunlight to keep the bus cool, at least where I'm from they did.
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  4. #124
    Wants to make it harder monkeyracer's Avatar
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    I'm doing a proof of concept to help you with this. I took some aluminum electrical boxes (think light switches, or outlets, the metal boxes behind the wall.) and some night lights. I sprayed one box flat white, the other chrome. When the paint dries, I'll put the lights in the boxes and compare. So we can see which is the brighter box.
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  5. #125
    Maximum Bitrate sporty_drew's Avatar
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    Quote Originally Posted by monkeyracer View Post
    I'm doing a proof of concept to help you with this. I took some aluminum electrical boxes (think light switches, or outlets, the metal boxes behind the wall.) and some night lights. I sprayed one box flat white, the other chrome. When the paint dries, I'll put the lights in the boxes and compare. So we can see which is the brighter box.
    lol i'm looking forward to seeking the outcome of this, are you just going to measure it by looking at it with your naked eye?
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  6. #126
    Wants to make it harder monkeyracer's Avatar
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    so here's the pics:











    It's hard to see the difference, but look closely, the light box on the right is brighter, and has more even distribution.

    So the naked eye is the only measuring device here, since that's what's going to observe the actual brightness anyways. I don't have any fancy equipment, this is just a proof of concept. It seems the difference is slight, but this is a small scale example.

    The winner is white (box on the right), it's just a little brighter, and more even. If this were done with actual LEDs in the scale biggy is planning, I'm sure the difference would be more noticeable.

    So, biggy, it's worth the extra time to paint it white. (even if it's only for a few extra nits.) If my test is wrong (and every single LCD manufacturer too) then it will only be darker by a few nits. There's not really much to lose here.
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  7. #127
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    Well, that was a fast answer, thanks for that test monkey, I was going to do that but you saved me the hassle. I don't quite understand how that works, maybe the whiteness acts as an activator rather then a refuser reacting on itself.

    Looks like im going to redesign the box as perspex now and Im going to try and put a the LCD components and all computer components into the box. I think im going to shrink the depth to 50mm and perhaps with a slight taper to counter the dash clearance issues.
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  8. #128
    Wants to make it harder monkeyracer's Avatar
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    I think from the tests, what it seems is happening is what LHC was saying:

    Quote Originally Posted by LHC View Post
    Your right in saying polished aluminium is more reflective, no one is denying that. However having it all polished aluminium will just reflect the light around for ever without actually illuminating anything. The white surface will 'capture' this light and glow in effect.
    Not sure what the physics are here, but the proof is in the pudding.
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  9. #129
    Variable Bitrate afterdigital's Avatar
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    hey biggy,

    just browsed thru and i'm really impressed. Look forward to following this project to the end.
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  10. #130
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    Thanks mate. Im going to start again very soon, im back home and going to setup my new workshop this weekend.

    Found an acrylic fabricator in my area so im going to work on some CAD plans for this perspex case and give it to them to quote me. I want to focus some energy on the software side of this upgrade as well.
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