apollo2011 Posted December 14, 2003 Share Posted December 14, 2003 I was just wondering how an LCD display worked. I heard that they like water bubles and they pass certain ammounts of electricity through them to make them display the right color. I am not sure if all/some of that is correct. Link to comment Share on other sites More sharing options...
iglak Posted December 14, 2003 Share Posted December 14, 2003 read this (clicky) from THE BEST SITE EVAR!!!!!!!!!11 (besides SFN) now, from your post on plasma, i think you mean plasma displays (clicky) , the two are different Link to comment Share on other sites More sharing options...
Dave Posted December 14, 2003 Share Posted December 14, 2003 LCD screens have lots and lots of leds in them. That's about it really (if only it were that simple). Link to comment Share on other sites More sharing options...
YT2095 Posted December 14, 2003 Share Posted December 14, 2003 LCD (Liquid Crystal Display) have 2 polarised films and sandwitched in between is a liquid that becones orientated )like a crystal) on exposure to an electical charge, thus allowing the light to pass through unhindered Link to comment Share on other sites More sharing options...
Guest sam_mil90 Posted December 14, 2003 Share Posted December 14, 2003 LCD stands for liquid crystal display and it definately doesn't use LED's which can emit only one colour, LED's are too big to make a quality picture because they are too big. Link to comment Share on other sites More sharing options...
apollo2011 Posted December 14, 2003 Author Share Posted December 14, 2003 iglak: No I meant LCD's. but learning how Plasmas work would be interesting too. Link to comment Share on other sites More sharing options...
Sayonara Posted December 14, 2003 Share Posted December 14, 2003 There is a "3D" LCD display in development. It's super funky. It relies on specific perspective, so there are stupid constraints on how it's used (EG you have to sit in a certain position and not move), but as usual once the technology is there some bright spark will figure out how to improve it. Link to comment Share on other sites More sharing options...
apollo2011 Posted December 14, 2003 Author Share Posted December 14, 2003 Yeah look at the first LCD Displays they had on Laptops. You could only see the screen when you were right in front. Now you can see them from just about any angle. Because of that now they have stupid little sheets that you slide onto your screen so people next to you (ex. on a plane) can't see what you are doing. You wouldn't need that if you were using one of the original displays. ;-) Link to comment Share on other sites More sharing options...
Kedas Posted December 14, 2003 Share Posted December 14, 2003 sam_mil90 said in post #5 :LCD stands for liquid crystal display and it definately doesn't use LED's which can emit only one colour, LED's are too big to make a quality picture because they are too big. uhmmm, LED's only one colour?? and about screen use: http://www.universaldisplay.com/tech.php http://www.zdnet.com.au/reviews/coolgear/av/story/0,2000023510,20273393,00.htm Link to comment Share on other sites More sharing options...
VendingMenace Posted December 15, 2003 Share Posted December 15, 2003 well, sam_mil90 was correct in his statement. LED's are typically only one color. The way you would get different colors is to put two or more of different color right next to eachother or on top of eachother. Then you would let the differnt colors blend to form form more colors. Also, the links you provided are for OLED's wich are a bit differnt than you standard LED's. Standard LED's would not make for very sharp displays, and they are rather clunky things. The LED part is rather large, usually, and they must be encased in an epoxy. OLED's on the other hand can be quite small, also, they can be encased in things that are quite flexible. Thus, they have the potential to make liightweight flexible monitors. (you could walk into a room, pull a sheet out of your pocket, unfold it and plug it into your computer as your monitor!). Of course OLED's are still a bit far off, at least from what i have heard. They are comming along, but they don't quite have the brightness and colors that the market would require. And besides, right now they don't really last all that long and would burn out kinda quickly. Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 pass through in one plane? Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 Actually, how can we make a liquid-crystal stage. loike making that object half liquid and half solid. Is it possible? Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 YT2095 said in post #4 :LCD (Liquid Crystal Display) have 2 polarised films and sandwitched in between is a liquid that becones orientated )like a crystal) on exposure to an electical charge, thus allowing the light to pass through unhindered What do you mean by polarised films? Link to comment Share on other sites More sharing options...
YT2095 Posted December 15, 2003 Share Posted December 15, 2003 imagine you`re in prison and the bars go from top to botom and are 6 inches apart. you have a pile plates 1 foot wide each. if you try throw them like a frisbee, they wont get past the bars. if the bars were going Across instead, the plates would be able to pass through easily. well consider light like it`s plates being thrown, and the bars as being the polarising film, only the light particles (plates) traveling on a certain plane will pass through it. that`s why if you get 2 of these films and lay one on top of the other it will apear black if you rotate it 90 degrees, because the bars go top to botom and side to side, making a grid that no plate can escape from hope that helps a little. Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 Wonderful illustration. Thanks YT! i love it! Link to comment Share on other sites More sharing options...
YT2095 Posted December 15, 2003 Share Posted December 15, 2003 n/p and you may already know this, but the LCD in a laptop is backlit by flourescent tubes, similar to those in the hand held torches. the type in your watch is passively lit, the back of the display has a reflective surface and uses ambient light to create the effect. some others have an electro lumiescent backing or tiny (smaller than a match head) ordinary fillament bulb. in mobile fone displays, it`s an LED array, whose light follows a polycarbonate structure to evenly spread the light out (a bit like a fiber optic). there`s a little bit more trivial data from the YT Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 heh, seriously. i don't know these stuff... it is a bit too advanced for me. Anyway, what is fiber optics? THanks AGain~ Link to comment Share on other sites More sharing options...
gene Posted December 15, 2003 Share Posted December 15, 2003 Btw, did you get the mail? I was wondering... this is more of a personal stuff... so i sent it as PM. Link to comment Share on other sites More sharing options...
YT2095 Posted December 15, 2003 Share Posted December 15, 2003 Fiber Optic, well it`s a wire basicly, except instead of it carrying electricity, is carries Light originaly it was a type of Glass, nowadays it`s made of plastics, plastics that are very pure and have no little bits in it to block the light as it travels down it`s length. maybe you`ve seen some and not realised it, have you seen these x-mas trees that light up all over the place but don`t have any bulbs that you can see? those are fiber optic cables, they look a bit like realy thick fishing line. nope, I`ve got no PM from you here yet? Link to comment Share on other sites More sharing options...
Kedas Posted December 15, 2003 Share Posted December 15, 2003 VendingMenace said in post #10 :well, sam_mil90 was correct in his statement. LED's are typically only one color. The way you would get different colors is to put two or more of different color right next to eachother or on top of eachother. Then you would let the differnt colors blend to form form more colors. Also, the links you provided are for OLED's wich are a bit differnt than you standard LED's. Standard LED's would not make for very sharp displays, and they are rather clunky things. The LED part is rather large, usually, and they must be encased in an epoxy. OLED's on the other hand can be quite small, also, they can be encased in things that are quite flexible. Thus, they have the potential to make liightweight flexible monitors. (you could walk into a room, pull a sheet out of your pocket, unfold it and plug it into your computer as your monitor!). Of course OLED's are still a bit far off, at least from what i have heard. They are comming along, but they don't quite have the brightness and colors that the market would require. And besides, right now they don't really last all that long and would burn out kinda quickly. - How can you put LED's of different colour besides each other if there is only one colour? (you just proved my point.) There are even IR LED's, obviously you can't make a full spectrum with one LED but any screen uses 3 base colours so no differents there. - Yes OLED aren't the same as LED's but they have much more in common with LED's than with LCD's. - I only have that site as reference but the only obvious disadvantage is lifetime (not brigthness) And it is not so far away you can even buy some first devices with OLEDs. Link to comment Share on other sites More sharing options...
Sayonara Posted December 15, 2003 Share Posted December 15, 2003 Polarising plastics have a structure that allows light to pass through in one plane only. Link to comment Share on other sites More sharing options...
YT2095 Posted December 15, 2003 Share Posted December 15, 2003 Kedas, it`s done by doping of the silicon on the same substrate with different carrier elements, it`s a single device with a common cathode and 3 anode inputs, Red Green and Blue, often accompanied by a sensor on the same substrate for detection of intensities (compensated for with an ASIC) they DO exist Link to comment Share on other sites More sharing options...
Kedas Posted December 15, 2003 Share Posted December 15, 2003 Yeah, that what I'm trying to say the whole time. there are diff. colours. (although I wasn't even mentioning that you can put them on the same substrate) Link to comment Share on other sites More sharing options...
YT2095 Posted December 15, 2003 Share Posted December 15, 2003 I know you were, I was backing you up Link to comment Share on other sites More sharing options...
Kedas Posted December 15, 2003 Share Posted December 15, 2003 OK Here some PDF info about materials and their corresponding wavelengths. (for the non believers) http://alpha.qmul.ac.uk/~ugez644/MAT203/LEDs.pdf EDIT: and especially for people who like to see it but can't view PDF: Common III-V materials used to produce LEDs and their emission wavelengths Material Wavelength (nm) InAsSbP/InAs 4200 InAs 3800 GaInAsP/GaSb 2000 GaSb 1800 GaxIn1-xAs1-yPy 1100-1600 Ga0.47In0.53As 1550 Ga0.27In0.73As0.63P0.37 1300 GaAs:Er,InP:Er 1540 Si:C 1300 GaAs:Yb,InP:Yb 1000 AlxGa1-xAs:Si 650-940 GaAs:Si 940 Al0.11Ga0.89As:Si 830 Al0.4Ga0.6As:Si 650 GaAs0.6P0.4 660 GaAs0.4P0.6 620 GaAs0.15P0.85 590 (AlxGa1-x)0.5In0.5P 655 GaP 690 GaP:N 550-570 GaxIn1-xN 340, 430, 590 SiC 400-460 BN 260, 310, 490 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now