tft lcd polarisation pricelist

Alibaba.com has a fascinating collection of LCD polarized filters. They are used in photography to reduce glare while still allowing plenty of light to pass through, manage reflections and darken skies. They have a wide range of applications, including producing LCDs for use in TVs, laptops, and phones and producing polarized sunglasses and polarizing camera filters. LCD polarized filters are classified into linear, elliptical and circular filters.

LCD polarizing films are designed to block light waves of certain polarizations while allowing light waves of other polarizations to pass through for an immersive visual experience. They allow for deeper-looking colors and sharper images to be displayed on LCD screens. Alibaba.com offers a wide range of LCD polarized filters, including anti-glare matte film, plain glossy film, wide-angle view film and brightness enhancement film. They can either be horizontally polarized to reduce glare from horizontal surfaces such as water or vertically polarized to reduce vertical surfaces such as skylights.

Linear polarizer film is an excellent choice for applications that require glare reduction from reflected light. Shoppers can use them in telescope filters and in industrial imaging applications to moderate the light source. Circular polarized films are used where high resolution and glare reduction are required. They are either right or left-handed. LCD polarized filters are strong and long-lasting, and they can be reflective, transmissive or transflective.

Shop for a variety of LCD polarized filter designs at low prices on Alibaba.com. They are made of various materials such as plastic, glass and crystals. Polarized plastic sheets have high polarizing efficiency and are protected by an additional film.

How is this product useful? Education is an obvious application. Demonstrate polarization of light. Place transparent tape on a light board and rotate the polarization filter and note its effects. See how it affects viewing of LCD displays. See how reflections can be blocked.

When designing a Liquid Crystal Display, including character, graphic and segment displays, a LCD display polarizer needs to be selected that will optimize the ambient lighting conditions the display will operate in.

The primary job function of a LCD display polarizer is to improve definition, color and to control how light is reflected, transflected or transmitted; without the polarizer it would be impossible to read the display.

To understand the placement of the polarizer, it is necessary to explain the construction of a basic Liquid Crystal Display. (This does not apply to TFT, LED, VFD or OLEDs.)

Applying the two polarizers is the next step: One polarizer is applied to the top layer of glass; this must always be a Transmissive polarizer. The second polarizer is located on the back of the bottom layer of glass (farthest away from the person reading the LCD). This polarizer is selectable by the designer.

There is no difference in cost or lead time of the three polarizers; one variable that does affect the cost of the LCD module is the size of the glass.

This article on choosing an LCD display polarizer is a guest journal from: John Keenan, MicroReady Inc., Electronic Product Design located in Phoenix, AZ.

TFT (Thin Film Transistor) LCD (Liquid Crystal Display)technology is currently dominant in the display world right now due to its lightweight, low power consumption, low manufacturing cost, etc. But LCDs do have several generic drawbacks. A narrow viewing angle is one of the main issues compared with other display technologies, such asOLED (Organic Light Emitting Diodes), CRT(Cathode-Ray Tube), Plasma, VFD(Vacuum Fluorescent Display), and most recent SamsungMicroLEDdisplays. They also don’t have a response time issue.

LCD scientists and engineers took more than 30 years of effort to improve the TFT LCD viewing angle which has made TFT screens widely applicable in different applications ranging from automotive, home appliances, medical, military, industrial, consumer, etc. The following is a summary of the different TFT wide viewing angle technologies.

When we talk about TFT LCD, we normally mean TN LCD. Thetwisted nematic effect(TN-LCD) takes advantage of the ability of the nematic substance to rotate the polarization of light beams passing through it. Two polarizing filters, parallel planes of glass with their polarizing lines oriented at right angles with respect to each other, are positioned on either side of the liquid crystal. When light enters the display, it is polarized by the input filter. In the absence of an electric field, all the incoming light is transmitted. This is because the light polarization is rotated 90 degrees by the nematic liquid crystal, and the light, therefore, passes easily through the output filter, which is oriented to match the 90-degree shift. With the application of a voltage, an electric field is produced in the nematic liquid crystal. Under these conditions, the polarization effect is reduced. If the voltage is large enough, the polarization effect disappears altogether, and the light is blocked by the output polarizing filter. Refer to Fig.1

In this case, when the display is observed from a vertical direction to the substrate, the display shows a dark state, because the optical axis of the liquid crystal is perpendicular to the substrate. However, when the display is observed from the tilted direction, the display does not show completely a dark state because light leaks due to the birefringence. The birefringence becomes predominant with an increase in the voltage. At different viewing angles, the birefringence is different and the transmission is different in each direction. This is the reason for the poor viewing angle of TFT LCDs. See Fig.3.

O-Film is an optical film that is applied to the TN TFT LCD and redirects light, providing all round viewing angles to any TN TFT LCD to which it is applied. It is easy to apply and relatively low cost.

This article is an original piece of content written by the engineering and technical support team atOrient Display. We are an LCD and display technology provider with over two decades of industry experience in delivering cutting edge display solutions. Please browse ourknowledge baseif you would like to learn more about LCDs!

They want $4,000 for the Planar setup, whereas the exact same monitors used to make it are about $120 apiece in good used condition on eBay. If you are already using an LCD monitor, get a second identical unit, so you already are halfway there as you read this

To do a quick mock-up use a piece of cardboard or paper of the size you want to order, hold it where the mirror is in the Planar setup as you sit in your normal viewing position in front of your monitor, try to get a 45? angle or so out of the paper/cardboard. Then check if you can still see the screen, if the answer is no, then it is a good size to use, get a couple extra inches to be safe. The mirror will allow you to see the LCD display like normal, with the reflection of the second LCD overlayed on top of it.

All you need is the above mentioned 2 LCD displays, be creative, 15" is fine on a budget (you can get them from people upgrading a Dell/Gateway/Emachines/HP bundled LCD display) 19" Widescreen, even 24", 30" or 50" should be possible, start with a smaller/cheaper "proof of concept" edition and then move up to the big leagues, remember that you will need a video card capable of driving the panels in native resolution for the games you want to play at an acceptable frame-rate (unless your monitor will show 1:1 with a black border on lower than native resolutions). With dual 1280x1024 17" panels that makes 2560x1024 pixels per frame, or 1280x2048, depending on how you look at it.

Basically any size LCD screen will work, as long as it is 45° polarized, get some cheap glasses from here: http://www.berezin.com/3d/3dglasses.htm#Polarized ($2 for 3, $6 for 10) and see if yours is, one eye will be dark as you look at the LCD, the other eye will remain clear.

As you put the LCD"s in the Planar arrangement shown above with a mirror (even plain glass could be used, ask a glass store for a scrap, it just will not be as reflective), the LCD that reflects off of the glass switches polarization by 90? and will be visible in one lens, while the other will not see it.

There will be some ghosting , even more when you use the mirror. To confirm the polarisation of the monitor Rotate the glasses while looking at the monitor thru one side or the other At one point the lens should be almost completely opaque Hopefully this should be normal angle at which the glasses are used

I have pictures, I haven"t got them uploaded anywhere yet, so I can"t show them. I went with the 2x4 and plywood route, with 2 aluminum straps to connect the mounting pads on the back of the LCD"s with the 2x4. I used a bit of solid copper insulated building wiring to hold up the mirror, it functions to a point.

Just curious. Is there any way of finding out the polarisation angle for LCD-screens before bying? The one i have now have straight 90? polarisation. I have a dual projector setup now but i am a little bit curious about a planar design with TFT"s (if not else i really like the innovative aspect).

In this thread i"m asking if anybody knows ho to get the polarisation angle for LCD-monitors. When asking resellers i get an answer type: "Polarisation angle? I"m not really sure what you"re talking about but i assure you we"we got a monitor that perfectly suits your needs bla bla". Also downloaded some pdf"s but haven"t found one yet with those kind of data...

This method has you look at one monitor directly, and use a standard mirror (or a front surface mirror) on your other eye to look at the second screen. I have thought of using this to make a franken-HMD, possibly mounted on an eye-level shelf with a movable chair, or a floating helmet supported by some sort of arm or chain to the ceiling. There are 10"-14" LCD screens that are 1280x768 or 1900x1200, and you could make quite the helmet rig with couple of those.

I"ve just bought a pair of paper glasses linearly (45/135) polarized. I discovered that my acer 1916w lcd monotor (19" widescreen) is polarized at 45° because

EDIT: using my shutterglasses with normal position I can see the screen of the LCD, tilt the glasses 45 degree and it"s almost black. With the shutterglasses at 90 degree it"s clear again. So even this doesn"t tell the polarization angle of the Dell"s (since I don"t know the polarization angle of the shutterglasses, I assume the pol. angle of the shutterglasses are the same as that of the polarized glasses that people used in their planar setup ?), is it safe to say the Dell"s are polarized at 45 degree ?

EDIT2: Tried the shutter glasses with my laptop LCD and found that with normal horizontal position it"s black and in perpendicular position it becomes clear so I think the best way is to buy a pair of polarized glasses and test it with the Dell"s LCD to make sure it works/or not and if the 45 degree glasses don"t work with the Dells then I should be able to try the 90 degree ones, I hope they do exist.

I"m about 98% complete with my dual acer 20" planar cube.. was wondering about convergence settings in the old nvidia cp but the other thread helped out there. The last thing I"m trying to figure out to make the planar complete is whether or not my top lcd needs the brightness and contrast to have higher luminance than the back lcd. On the XP desktop I still get a horiztonally flipped image from the top lcd until I engage a game - then the top lcd flips horizontally after DX9 is implemented.

Should the back lcd or top lcd be brighter and higher in contrast for tweaking convergence and separation, since that is the final step here and I haven"t had a lot of time to do any testing?

I was wondering about the pop out effect with this.. mine is set up correctly and plays a good number of games but if there is any pop out it somewhat just shows at the front of the cube at a seemingly closer distance to your eyes. If a bracket method is used, does any kind of light become a big problem anywhere along the line with reflections and shadows anywhere? I"m asking because in the dark and with a bracket where you can"t notice the glass too much that perhaps the S3D effect does appear to pop out from the screen into thin air as well as depth... because mine is like looking into an lcd monitor almost 2 feet deep with a very compatible game. I would think with a bracket you would have a neat holographic pop out effect in pitch dark, but another post mentioned something about needing a little light so the pupils do not dilate to reduce crosstalk.

I got a 70/30 teleprompter mirror from telepromptermirrors.com or something close to that for $152 or so. What showed up appeared to be a 50/50 piece instead after the "white card test" proved nothing, and they accept no returns at all, but the 50/50 works just fine. I"m very happy with the planar. If you order from them, as soon as the glass arrives call them and ask them to walk you through the white card test to see if they sent you a 50/50 instead of a 70/30 or 60/30. If you see no gap when a white index card is at the mirror, then that is the silvered side according to that company. On mine, there was no difference and both sides had the gap, but the reflected top lcd colors are slightly off in desktop mode.. would you say that is that normal? Also, I have to tilt the berezin $3 glasses slightly clockwise on my face to eliminate ghosting sometimes.

Hi folks, there are lots of posts about this dual LCD + polarized glasses but all are about a vertical setup. I got a noob question that"s been gnawing: why there is no talk about setting it up horizontally, similar to planar/mirror setup? Is it because it"s technically not possible? This would eliminate the hassle building a framework for the vertical monitor. (You guys can see I haven"t dwelled into this too much technically hence this silly question, BTW anyone has pointer to some good read on this dual LCD+polarized stuff better than what google gives?). Thks. DR

Yep I tried the "2 LCD + Mirror" method using just a handheld small mirror and saw that it works with a head movement restriction and that"s why I"m interested in "the beamsplitter + 2 LCD + polarized glasses" technique since it solves the head movement restriction problem. But so far I"ve read only about vertical setup of this technique and none uses the horizontal method given that with the horizontal setup there is no need for an elaborate framework to hold the upper LCD, in addition both LCD"s can still be used normally easily (just remove the beamsplitter and you can have a dual monitor setup for work, put it back in and you have nice S3D setup for games), I guess that"s why I thought there might be technical issue that prevents such a setup and want to check first since to me it seems more practical and useful than the vertical method. DR

And of course you should be able to use horisontal with a semireflective mirror as well. If the polarization of the lcd"s is 45° or 135° it should work without extra retarders+polarizers.

I"d hope polarized glasses vendors should have all kinds of flavors to sell and not just 45/135. I don"t know what my LCD"s polarization are except that they are different from my laptop"s which also an unknown. It"s likely that"s the laptop being 45 degree and the desktop 0 degree, in that case I need to order a pair of 0/90 polarized glasses without resorting to retarders, I think.

Likay wrote:And of course you should be able to use horisontal with a semireflective mirror as well. If the polarization of the lcd"s is 45° or 135° it should work without extra retarders+polarizers.

The problem is that the semireflective mirror only handles the polarizationshift if the lcd"s polarization is 45 or 135°. (Otherwise you need to shift polarization of one monitor 90° or both 45°).

The problem is that the semireflective mirror only handles the polarizationshift if the lcd"s polarization is 45 or 135°. (Otherwise you need to shift polarization of one monitor 90° or both 45°).

Doesn"t this cause additional loss of brightness? I hope it doesn"t become as bad as what LCD shutterglasses has. Let"s see, loss due to beamsplitter, loss due to additional retarder, loss due to polarized glasses. It can"t be good. Before I spend time and money on this, I"d like to know more about this. Thanks Likay.

distantreader wrote:Hi folks, there are lots of posts about this dual LCD + polarized glasses but all are about a vertical setup. I got a noob question that"s been gnawing: why there is no talk about setting it up horizontally, similar to planar/mirror setup? Is it because it"s technically not possible? This would eliminate the hassle building a framework for the vertical monitor. (You guys can see I haven"t dwelled into this too much technically hence this silly question, BTW anyone has pointer to some good read on this dual LCD+polarized stuff better than what google gives?). Thks. DR

On a desk: OK as long as you can get the mirror lined up. Best with a platform 8-12 inches above desk height so you have room on the desktop, and so you are looking into the screen. Needs nothing but 2 LCDs and a piece of glass, so near free. Nothing to build, just set on a desk. Option to slide second screen back and use 2 monitors (great if you do any 3D modeling/texturing, or work with Gimp/Photoshop)

I didn"t try it with polarised filters, don"t want to buy them because the 2 crt"s setup was just a test and is too "big" to keep on my desk so I think it"s better to use 2 lcd"s wich are polarized already but the rendering of the 2 pictures seem to be very good