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Car Forum / Chevrolet / Chevrolet Corvette / December 2005HUD polarization ???
Haven't used polarized sunglasses since mid 1970s. Bought a new set of shades to go with the C5 and opted for polarized lenses. Back in the car, HUD was invisible. Checked with the HUD in mama's car--same also invisible. Turned glasses 90 degrees and HUD became visible. Anyone else experiencing same problem or did I get a set of screwed up glasses?? PJ > Haven't used polarized sunglasses since mid 1970s. Bought a new set of > shades to go with the C5 and opted for polarized lenses. Back in the > car, HUD was invisible. Checked with the HUD in mama's car--same also > invisible. Turned glasses 90 degrees and HUD became visible. Anyone > else experiencing same problem or did I get a set of screwed up glasses?? Works just fine with polarized lenses for me.  SignatureErik Veit ------- Dublin, CA ------- http://homepage.mac.com/zombie67/ it's specific to the glasses. depends upon which way the polarization is aligned, and the glasses maker doesn't care. try a few different pairs to see if they're all the same. i have a pair that i can't see the speedo in my 94 without tilting my head sideways. it's most annoying. >> Haven't used polarized sunglasses since mid 1970s. Bought a new set of >> shades to go with the C5 and opted for polarized lenses. Back in the [quoted text clipped - 3 lines] > > Works just fine with polarized lenses for me. >> Haven't used polarized sunglasses since mid 1970s. Bought a new set >> of shades to go with the C5 and opted for polarized lenses. Back in [quoted text clipped - 4 lines] > > Works just fine with polarized lenses for me. FWIW, the LCD panels in the center stack (no nav) look covered with an oily film, rainbow colors, but still legible. SignatureErik Veit ------- Dublin, CA ------- http://homepage.mac.com/zombie67/ c5 owners manual mentions that polarized shades can clock the hud image. I am a dumbass... Please explain what Polarized glasses mean and why they would ruin the HUD projection ? Isn't polarized glass what turns dark in sunlight ? or is that photochromatic ? I once wondered if I tinted the windscreen a darker shade if the HUD would still work. Would it ? >I am a dumbass... Please explain what Polarized glasses mean and why > they would ruin the HUD projection ? [quoted text clipped - 3 lines] > I once wondered if I tinted the windscreen a darker shade if the HUD > would still work. Would it ? Is it legal to tint a front class in any vehicle? SignatureDad 05 C6 Silver/Red 6spd Z51 72 Shark Black/Black/4spd No I dont think its legal, but you can still tint the top 1/3 rd of the windscreen in gradient. Law here in So Cal is 5"s above and 5"s below eye level has to be clear other than that it can be limo tint... And the way to get by with this in court is the law states your windshield height has to be 10"s centered at eye level so anything above and below can be blocked totally out... SignatureZÿRiX (<>..<>) > No I dont think its legal, but you can still tint the top 1/3 rd of the > windscreen in gradient. also here are the laws... http://www.gilafilms.com/PDF%27s/State%20Law%20Chart%208-9-04.pdf SignatureZÿRiX (<>..<>) > No I dont think its legal, but you can still tint the top 1/3 rd of the > windscreen in gradient. >I am a dumbass... Please explain what Polarized glasses mean and why > they would ruin the HUD projection ? > Isn't polarized glass what turns dark in sunlight ? or is that > photochromatic ? i guess google is broken today. http://www.colorado.edu/physics/2000/polarization/polarizationI.html > I once wondered if I tinted the windscreen a darker shade if the HUD > would still work. Would it ? yes. it still wouldn't be legal. > I am a dumbass... Please explain what Polarized glasses mean and why > they would ruin the HUD projection ? > Isn't polarized glass what turns dark in sunlight ? or is that > photochromatic ? Photochomatic. > I once wondered if I tinted the windscreen a darker shade if the HUD > would still work. Would it ? It's easy to visualize polarization if you think of light as being carried by point particles that travel along wavy lines. (Yeah, I know this is not accurate physics, but the analogy is good enough for here, okay?) Each particle of light vibrates at a particular angle. This is its angle of polarization. Polarized glass, or whatever, transmits only light polarized in a particular direction (plane) and stops the rest. You can visualize it as a grid of tiny slits that only pass light that's vibrating parallel to those slits. Ordinary light is a flood of particles vibrating at all angles. Polarized light all vibrates at the same angle. Being reflected tends to polarize light. Polarized sunglasses have their polarization aligned to block preferentially light reflected by certain materials at certain angles, and so can block reflected glare with only a minimal reduction in non-glare light. To that end I think they're all polarized in about the same direction. Now, the HUD works by reflecting a CRT (embedded in the dash behind some lenses) off the inner surface of the windshield. What you see is that reflection. Since it's reflected light it is polarized and thus susceptible to being blocked by polarized sunglasses, and there's not much to do about it. As to your last question, if you do anything to change the reflectivity of the inner surface of the windshield, the display is at risk. -- V > Haven't used polarized sunglasses since mid 1970s. Bought > a new set of shades to go with the C5 and opted for [quoted text clipped - 5 lines] > > PJ just lean you head over 90 degrees when ya want to see HUD. just kiddin :-) real strange problem ya got there.. remind me of the time I got some of them blue-blocker shades. couldn't see the color yellow. yellow looked white for a couple of weeks. had them on when I went to a HD dealership. was looking at a yellow low-rider and told the owner I didn't know he had a white low-rider. he looked at me and said "are you color blind?" I took the shades off and the bike was yellow. I then told the owner to come and look through these shades. he did and couldn't believe it. the Harley rep was in the store at the time. we called him over to look through the shades. I told him that HD didn't need to make different color bikes, just include a pair of these blue-blocker shades with each sale :-) nuff rambling -- Signature"Key" Photochromic lenses are the ones that turn dark when exposed to light. They were originally only available in glass and called photogray. The last several years they have been available in plastic and polycarbonate materials as well. The most popular brand right now is Transitions. Polarized lenses contain a filter in the material that doesn't allow light from certain directions to pass through the lens. The most common use is to stop "glare" or reflected light. That's why they're used in many sunglasses for use on the water or snow. If aligned properly they stop the light reflected up from the water or snow. Fisherman love it because they allow them to see into clear water for a few feet to spot fish. Properly aligned they make it tough to see lcd readouts because you are viewing them via reflected light. Same reason they aren't recommended for pilots. If you have a pair that doesn't make such readouts appear black they were either aligned incorrectly or are of such poor quality that they're not doing the job. Brad (an optician for the last 30 years) > Haven't used polarized sunglasses since mid 1970s. Bought a new set of > shades to go with the C5 and opted for polarized lenses. Back in the car, [quoted text clipped - 3 lines] > > PJ Any LED device is polarized. all diodes are polarized. look at a laptop screen... > Haven't used polarized sunglasses since mid 1970s. Bought a new set of > shades to go with the C5 and opted for polarized lenses. Back in the car, [quoted text clipped - 3 lines] > > PJ I use polarized sun glasses on my boats..removes the glare off the water..in my Vette with the tinted windows ( after market)..I see colors..also see spots on rear windows of other cars and colors on their tinted windows.....not so with my regular sunglasses. All sunglasses seem to destroy the clarity of the digital displays..why in heck don't the auto engineers ever develop these displays to be somewhat sunglass compatible..Don't these clowns ever wear sunglasses when they drive....???? Give us a break guys do your home work.. > I use polarized sun glasses on my boats..removes the glare off the > water..in my Vette with the tinted windows ( after market)..I see [quoted text clipped - 4 lines] > somewhat sunglass compatible..Don't these clowns ever wear sunglasses > when they drive....???? Give us a break guys do your home work.. AFAIK there's no way to build a reflected-light display without it polarizing the light. That's just physics. Also I think most plastics polarize light at least somewhat in transmission, hence issues with window tinting stuff. Suggest you try a set of aviator's sunglasses, especially with G-15 color-neutral lenses. They do a fine job of cutting glare without changing colors, don't reduce clarity of anything, and do not use polaroid filters. Work fine in my C6 w/ HUD. Bosch & Lomb make a particularly fine set if their price doesn't scare you away. -- V Rayban G15 Lens are great! I've had several pairs. >> I use polarized sun glasses on my boats..removes the glare off the >> water..in my Vette with the tinted windows ( after market)..I see [quoted text clipped - 18 lines] > > -- V SignatureRic Seyler Online Racing: RicSeyler GPL Handicap 6.35 ricseyler@SPAMgulf.net http://www.pcola.gulf.net/~ricseyler remove –SPAM- from email address -------------------------------------- "Homer no function beer well without." - H.J. Simpson > Rayban G15 Lens are great! I've had several pairs. > [quoted text clipped - 20 lines] >> >> -- V Thanks to all. Yup the old shades were G-15's. If I had stopped to really think it out (like the pres says, it's "hard work"), I'd have realized that the reflection off windscreen from the HUD is horizontally polarized and the reflection off the road is horizontally polarized too. The glasses are vertical to block the road glare--so they were made correctly--my appologies to American Optical. So, this is a, "can't have your cake and eat it too" situation. The old G-15's in the C4 get moved to the C5 and the new shades get used for commuting where there's no HUD. PJ '89 Hooker Car -- '02 C5 > Any LED device is polarized. all diodes are polarized. look at a laptop > screen... Laptop screens are LCD not LED... >>Haven't used polarized sunglasses since mid 1970s. Bought a new set of >>shades to go with the C5 and opted for polarized lenses. Back in the car, [quoted text clipped - 3 lines] >> >>PJ Each pixel on a laptop screen is driven by a polarized diode. Use polarized glasses and try it... :-) Pappy >> Any LED device is polarized. all diodes are polarized. look at a laptop >> screen... [quoted text clipped - 8 lines] >>> >>>PJ > Each pixel on a laptop screen is driven by a polarized diode. > Use polarized glasses and try it... > :-) > Pappy No it isn't it uses Liquid Crystals: An LCD panel is made up of two pieces of polarized glass. A special polymer that creates microscopic grooves in the surface is rubbed on the side of the glass that does not have the polarizing film on it. The grooves must be in the same direction as the polarizing film. You then add a coating of nematic liquid crystals to one of the filters. The grooves will cause the first layer of molecules to align with the filter's orientation. Then add the second piece of glass with the polarizing film at a right angle to the first piece. Each successive layer of TN molecules will gradually twist until the uppermost layer is at a 90-degree angle to the bottom, matching the polarized glass filters. As light strikes the first filter, it is polarized. The molecules in each layer then guide the light they receive to the next layer. As the light passes through the liquid crystal layers, the molecules also change the light's plane of vibration to match their own angle. When the light reaches the far side of the liquid crystal substance, it vibrates at the same angle as the final layer of molecules. If the final layer is matched up with the second polarized glass filter, then the light will pass through. If we apply an electric charge to liquid crystal molecules, they untwist! When they straighten out, they change the angle of the light passing through them so that it no longer matches the angle of the top polarizing filter. Consequently, no light can pass through that area of the LCD, which makes that area darker than the surrounding areas. LCD displays use polerized light, yes. But they DON'T use Light Emitting Diodes. >>>Any LED device is polarized. all diodes are polarized. look at a laptop >>>screen... [quoted text clipped - 8 lines] >>>> >>>>PJ >> Each pixel on a laptop screen is driven by a polarized diode. >> Use polarized glasses and try it... [quoted text clipped - 6 lines] > polymer that creates microscopic grooves in the surface is rubbed on > the side of the glass that does not have the polarizing film on it. Agreed, but... Some laptops use Light-Emitting Diode (LED) and plasma displays, but they are not as common. LED and plasma displays need more power, which drains the battery even more. This also makes them a less popular solution for laptop displays. http://computer.howstuffworks.com/laptop4.htm SignatureDad 05 C6 Silver/Red 6spd Z51 72 Shark Black/Black/4spd While they make that statement (about there being LED and Plasma display laptops) on the hows it done website, I have never seen or heard of one (doesn't mean there isn't) and I have owned, used and seen a LOT of laptops. A google search did not come up with a single laptop model that had either of those available. Please show me a model of laptop that has an LED or Plasma display. >>>Each pixel on a laptop screen is driven by a polarized diode. >>>Use polarized glasses and try it... [quoted text clipped - 15 lines] > > http://computer.howstuffworks.com/laptop4.htm > While they make that statement (about there being LED and Plasma > display laptops) on the hows it done website, I have never seen or [quoted text clipped - 23 lines] >> >> http://computer.howstuffworks.com/laptop4.htm Darn those people, don't they know better than to publish that kind of thing when it can't be proven. Not much future in hunting up information to prove what another site says that they felt was correct. Best thing to do is to ask them. If they can't prove what they have posted you might ask them to remove it and apologize to all of the people they've mislead. The research underway to improve the LED display is there but mostly in cell phones, and believe it or not, an electric razor, and the Kodak 633 camera. In fact they are in the marketplace now. In the past they have worked with the LED display for outdoor use by civil engineers and photographers laptops. Seems like that would be the type of display the military would use. If that is so maybe someone in the know about their laptops could let us know. Can't remember the trade magazine I was reading a few years back that had an LED display they could roll up it was so thin. Think it was an organic LED or maybe a polymer, both of which will kill the present LCD market if they can get the market to get with the program. Long way off the Corvette topic but interesting. SignatureDad 05 C6 Silver/Red 6spd Z51 72 Shark Black/Black/4spd > Any LED device is polarized. all diodes are polarized. look at a laptop > screen... Speaking of diodes, does anyone happen to know what Diode is up to? I haven't seen him in a long while. I hope he wasn't in the path of Katrina. He was a pretty active group member for a long while. Does anyone have the scoop? > Speaking of diodes, does anyone happen to know what Diode is up to? I > haven't seen him in a long while. I hope he wasn't in the path of Katrina. > He was a pretty active group member for a long while. Does anyone have the > scoop? Don't think that is the case, he's on the north east coast. SignatureLife is a sexually transmitted condition that is always fatal. >> Speaking of diodes, does anyone happen to know what Diode is up to? I >> haven't seen him in a long while. I hope he wasn't in the path of >> Katrina. He was a pretty active group member for a long while. Does >> anyone have the scoop? > Don't think that is the case, he's on the north east coast. Any word from him Dad? Do you happen to know if he's okay? >>> Speaking of diodes, does anyone happen to know what Diode is up to? I >>> haven't seen him in a long while. I hope he wasn't in the path of [quoted text clipped - 3 lines] > > Any word from him Dad? Do you happen to know if he's okay? I couldn't say other than he said he was dealing with some issues and I took it that he didn't want to share any more than that. I just hope everything is going well and that it will allow him to join us again soon. SignatureDad 05 C6 Silver/Red 6spd Z51 72 Shark Black/Black/4spd >>>snip >> >> Any word from him Dad? Do you happen to know if he's okay? > I couldn't say other than he said he was dealing with some issues and I > took it that he didn't want to share any more than that. I just hope > everything is going well and that it will allow him to join us again soon. I'm with you there Dad. Diode, if you're out there, drop us a note please. We're thinking of you man! |
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