tft lcd backlight no image brands

The Transmissive polarizer is best used for displays that run with the backlight on all the time. This polarizer provides the brightest backlight possible. If you have a need for a bright backlight with lower power drain, transmissive is a good choice for this TFT LCD display.

Focus LCDs can provide many accessories to go with your display. If you would like to source a connector, cable, test jig or other accessory preassembled to your LCD (or just included in the package), our team will make sure you get the items you need.Get in touch with a team member today to accessorize your display!

Focus Display Solutions (aka: Focus LCDs) offers the original purchaser who has purchased a product from the FocusLCDs.com a limited warranty that the product (including accessories in the product"s package) will be free from defects in material or workmanship.

When an LED backlight doesn;t work, it is a bgi issue. An LCD backlight is a solution to make a LCD readable when there is not enough outside light. The LED backlight is the most common type of backlight used in character, static and mono graphic displays and illuminates the LCD from the side or back of the display. Backlights are used in displays to increase visibility in low light conditions. Most LCD’s that are equipped with a backlight employ a diffuser (similar to a lamp shade) to provide a more even light from the LED’s.

It is not uncommon when designing your product to have the LCD work, but it seems the LED backlight doesn"t work. Chances are the backlight still works, but isincorrectly connected.

LED backlights require Direct Current (DC), which means you must connect the positive of the backlight to the positive supply of your power supply. And the negative of the backlight to the negative supply of your power supply.

Connect one wire of the LED backlight to pin 15 and the other wire to pin 16. Turn on the power. If this does not work, turn off the power and reverse the wires.

Connect one wire of the LED backlight to pin #1 and the other wire to pin #2. Turn on the power. If this does not work, turn off the power and reverse the wires

When possible, we recommend designing your product so that pins 15 and 16 are used for the backlight. It is possible to power the backlight with pins 1 and 2, but this is the supply voltage for the LCD and we do not recommend this.

If, after reading this article and trying the steps outlined, you still find your LED backlight doesn"t work, call us. We"d be pleased to help. FocusLCDs.com carries standard LCDs in stock and in many cases can ship the same day. Call us today for help at 480-503-4295

LCD is the abbreviation for liquid crystal display. An LCD basically consists of two glass plates with a special liquid between them. The special attribute of this liquid is that it rotates or “twists” the plane of polarized light. This effect is influenced by the creation of an electrical field. The glass plates are thus each coated with a very thin metallic film. To obtain polarized light, you apply a polarization foil, the polarizer, to the bottom glass plate. Another foil must be applied to the bottom glass plate, but this time with a plane of polarization twisted by 90°. This is referred to as the analyzer.

In the idle state, the liquid twists the plane of polarization of the incoming light by 90° so that it can pass the analyzer unhindered. The LCD is thus transparent. If a specific voltage is applied to the metallic film coating, the crystals rotate in the liquid. This twists the plane of polarization of the light by another 90°, for example: The analyzer prevents the light getting through, and the LCD thus becomes opaque.TN, STN, FSTN, blue mode, yellow-green mode

Liquids that twist the plane of polarized light by 90° are referred to as TN (Twisted Nematic). STN (Super Twisted Nematic) liquids twist the plane of polarized light by at least 180°. This gives the display improved contrast. However, this technology does color the display to a certain extent. The most common colors are referred to as yellow-green and blue mode. There is also a gray mode, which in practice is more blue than gray, however.

In order to counteract the undesired color effect, the FSTN technology uses an additional foil on the outer side, but this causes a loss of light and means that this technology is only effective with lit displays.

However, the different colors occur only in displays that are either not lit or that are lit with white light. If there is any color in the lighting (e.g. yellow-green LED lighting), it overrides the color of the display. A blue-mode LCD with yellow-green LED lighting will always appear yellow-green.Static or multiplex driving method

Small displays with a small viewing area are generally statically driven. Static displays have the best contrast and the largest possible angle of view. The TN technology fulfills its purpose to the full here (black and white display, reasonably priced). The bigger displays get, however, the more lines become necessary in static operation (e.g. graphics 128x64=8192 segments =8192 lines). Since there is not enough space on either the display or a driver IC for so many lines, multiplexing is used. The display is thus divided up into rows and columns, and there is a segment at each intersection (128+64=192 lines). Scanning takes place row by row (64x, in other words a multiplex rate of 1:64). Because only 1 row is ever active at any one time, however, the contrast and the angle of view suffer the higher the multiplex rate becomes. This makes it essential to use STN.Angle of view 6°°/12°°

Every LCD has a preferred angle of view at which the contrast of the display is at its optimum. Most displays are produced for the 6°° angle of view, which is also known as the bottom view (BV). This angle corresponds to that of a pocket calculator that is lying flat on a desktop.

LCDs without lighting are hard to imagine these days. However, since there are basically four different types of lighting, the type selected depends very much on the application. Here is a brief overview to clarify the situation:LED

However, the lighting also determines the optical impression made by the display, and the display mode; blue or yellow-green – does not always have an influence. Below you can see the EAP162-3N display with different types of lighting by way of example:Lighting

Standard LCDs have a temperature range of 0 to +50°C. High-temperature displays are designed for operation in the range from -20 to +70°C. In this case, however, additional supply voltage is generally required. Since the contrast of any LCD is dependent on the temperature, a special temperature-compensation circuit is needed in order to use the entire temperature range, and this is particularly true for high-temperature displays (-20 to +70°C). Manual adjustment is possible but rather impractical for the user.

However, the storage temperature of a display should never be exceeded under any circumstances. An excessively high temperature can destroy the display very quickly. Direct exposure to the sun, for example, can destroy an LCD: This is because an LCD becomes darker (in positive mode) as it gets hotter. As it gets darker, it absorbs more light and converts it to heat. As a result, the display becomes even hotter and darker... In this way, temperatures of over 100°C can quickly be reached.Dot-matrix, graphics and 7-segment displays

The first LCDs were 7-segment displays, and they are still found today in simple pocket calculators and digital watches. 7 segments allow all of the digits from 0 to 9 to be displayed.

Text displays require what is known as a dot matrix, an area consisting of 5x7=35 dots, in order to display all of the letters in the alphabet as well as various special characters. Graphics displays have a similar structure to text displays. In this case, however, there are no spaces between the lines and characters.Display drivers and controllers

The semiconductor industry now offers a very large range of LCD drivers. We generally distinguish between pure display drivers without intelligence of their own, controllers with a display memory and possibly a character set, and micro-controllers with integrated LC drivers.

Many ask themselves, "What is the difference between an LCD display and a TFT-display?" or "What is the difference between a TFT and an OLED display?". Here are these 3 sometimes extremely different display technologies briefly explained. LCD vs. TFT vs. OLED (comparison).

- The LCD (Liquid Crystal Display) is a passive display technology. The operation and the structure are described above. Passive means that an LCD can only darken or let out light. So it always depends on ambient light or a backlight. This can be an advantage because the power consumption of a LCD display is very, very low. Sometimes even less than the accumulated power consumption of an E-paper display, which in static operation requires absolutely no energy to maintain the content. To change the contents, however, a relatively large amount of power is required for an E-paper display.

LCDs can also be reflective, so they reflect incident light and are therefore legible even at maximum brightness (sunlight, surgical lighting). Compared to TFT and also OLED, they have an unbeatable advantage in terms of readability and power consumption :; the "formula" is: Sunlight = LCD.

- A TFT-display (of Thin-Film Transistor) is usually a color display (RGB). From the construction and the technology it corresponds to the LCD. It is also passive, so it needs a backlight. This is in any case necessary except for a few, very expensive constructions. However, a TFT needs much more light than the monochrome relatives, because the additional structures on the glass as well as the additional color filters "swallow" light. So TFTs are not particularly energy-efficient, but can display in color and at the same time the resolution is much higher.

- OLED displays (by Organic-Light-Emitting-Diode) are as the name implies active displays - every pixel or sign generates light. This achieves an extremely wide viewing angle and high contrast values. The power consumption is dependent on the display content. Here OLEDs to TFTs and LCDs differ significantly, which have a nearly constant power consumption even with different display contents. Unfortunately, the efficiency of converting the electric current into light energy is still very poor. This means that the power consumption of OLEDs with normal content is sometimes higher than that of a TFT with the same size. Colored OLEDs are increasingly used in consumer devices, but for the industry, due to their availability and lifetime, currently only monochrome displays are suitable (usually in yellow color).

In the reaction time, the OLEDs beat each TFT and LCD by worlds. Trise and Tfall are about 10μs, which would correspond to a theoretical refresh rate of 50,000 Hz. Possibly an advantage in very special applications.

Finally the question "What is better, LCD, OLED or TFT?" Due to the physical differences you can not answer that blanket. Depending on the application, there are pros and cons to each individual technology. In addition to the above differences, there are many more details in the design and construction that need to be individually illuminated for each device. Write us an e-mail or call us: we have specialists with some 20- and 30-year experience. We are happy to compare different displays together with you.AACS and IPS technology

Once more the new AACS technology (All-Angle-Color-Stability) improves the color stability for different viewing angles. It"s providing same color for 90° straight view as for 20° or 160° bottom or top view. There"s no more color shift or inverting effect.

Panox Display provides free connectors for clients who purchase more than five products from us. Our product range includes connectors from Molex, Kyocera, AXE, AXG, JAE, Hiros, and more.

Panox Display provides a customized cover glass/touch panel service. We supply cover glass from Gorilla, AGC, and Panda, which all have excellent optical performance. We also supply driver ICs from Goodix and Focaltech.

If your applications are directly connected to a PC, a cellphone, or Raspberry Pi, and you have enough space to insert a board to input video, Panox Display can provide customized Controller/Driver boards with input connections for VGA, HDMI, DVI, DP, Type-C video input, MIPI, RGB, LVDS, and eDP.

The functions of our boards include, but are not limited to, adjustment of brightness, sound output, touch interface, extra data transmission, and gyroscope.

This 32” RLCD computer monitor is the first in the world of its kind! Made primarily for those who experience discomfort from backlit monitors, it combines familiarity with groundbreaking innovation. It has no backlight, using only the ambient light that is available in most indoor settings. At a 32" diagonal size, it the largest monitor on the reflective market. there"s no flashing or blue light emissions. It is extremely easy to use. Just connect via HDMI and go! Its thin, sleek design will look great on any desktop.

Backlights are a common source of discomfort for many people due to flashing, high brightness, and blue light emissions. We developed a fundamentally different solution that doesn’t use a backlight: A monitor featuringColor Reflective LCD (RLCD) Technology.

This RLCD monitor is the first of its kind. Compared to other reflective technologies, like E-ink,it features a full-color spectrum, high refresh rate (no ghosting), and a 32 inch screen — the largest RLCD on the market. It’s great for work, watching videos, gaming, and more!

“I received the monitor today and I just want to say THANK YOU SO MUCH. This is sorcery how good it is. I cannot believe this exists. I really appreciate it. Your company has a very bright future and a lifetime customer!!”

"It"s working wonderfully and it"s not causing me any eye pain or discomfort! I"m so grateful for this product! Your Customer service was great. Thank you so much!"

While it’d be fun to say this was all our idea, it wouldn’t be accurate. Truth be told, this was largely inspired by people like you. Thanks to your feedback, we saw the value in moving some of our reflective tech indoors. With it, we’ve developed something unique. Introducing our all new 32” RLCD Computer Monitor. Our thanks go to you. You helped make it happen! Read Our Story

As a highly trusteddisplay manufacturerfor some of the world"s largest OEMs, we take great care in the quality of our products. That"s why each of our RLCD Monitors comes standard with a1-Year Manufacturer"s Warranty. It"s our promise to you that we will replace any defective item or part for FREE in cases where damage or defects were the result of our manufacturing.

Only US$14.99, buy best 3.5 inch tft color display screen module 320 x 480 support uno mega2560 geekcreit for arduino - products that work with official arduino boards sale online store at wholesale price.

It appears to me that there is no backlight control, either through software or hardware. Neither is there a comprehensive schematic for either the screen part or for the circuit board. The controller chip, the ILI9481 does, however, appear to be well documented.

Anyway, what I am hoping is that it is possible to disconnect the backlight leds at the 24 pin socket on the board, to which the screen is attached by ribbon cable. The pins numbered 1 to 6 look the most promising, with pins 1 & 3 being visibly connected to ground and pins 2,4 and 5 being connected together. If so, then I would use an appropriate transistor and PWM to regulate the light.

Of course, I am aware that this exercise would be hopeless if the backlight leds and the controller share both a common ground and common Vcc the wrong side of this connector.

I also found this picture which appears to imply you may be able to make a neater job by making 2 cuts on the board without disturbing the 24 pin connector. Cut the 2 visible traces to connector pin 1 at the point above the "1" on the silk screen and to the left of the chevron "<" then make your connection to the pad of the connector. Before making the connection, check with a meter (or by confirming that the back light no longer works) that pin 1 is really then isolated from the ground plane.

The liquid crystal display (LCD) technology has been used in several electronic products over the years. There are more reasons for LCDs to be more endearing than CRTs.

Poorly designed backlight. LED-backlit LCD monitors require a backlight to show the image on the screen. The position and quality of these backlight systems have an impact on the uniformity of the screen. Many monitors only have a strip of LEDs at the top or bottom of the screen and use a series of diffusion films behind the LCD panel to create an even backlight. Unfortunately, not all of these designs are made the same, and edge-type backlights will often have a visible backlight that looks like a distracting bright strip on one of the edges of the screen. However, some higher-end monitors have direct LED backlighting with LEDs placed all over the screen, resulting in better uniformity. Learn more about different types of backlights on TVs here.

Lenient manufacturing and uneven frames. LCD screens are made of many layers, and most of these are flexible. When the monitor is being built or transported, some of these layers likely bend. These can cause uneven diffusion of light which leads to clouding and backlight bleed.

Uneven intensity of the lighting. Sometimes, the LEDs themselves have manufacturing issues. This leads to certain areas of the screen having stronger backlight than others which leads to very visible uniformity issues in blacks but also colors and greys.

Monitors use different panel technologies to produce an image. Most monitors use LCD panels, of which there are different types. VA panels are known for their high contrast ratio, so they display deep blacks, but it doesn"t mean they have good black uniformity, as seen with the AOC CQ27G2 in the When It Matters section. The more common IPS panels have a low contrast ratio, which we can see with the ASUS TUF Gaming VG27AQL1A above. On average, VA and IPS panels have about the same black uniformity, but it depends on the model. There"s also a rare third panel type, the TN panel. It usually has the worse uniformity, as you can see here.

There"s another panel technology that"s different from LED-backlit monitors: OLED. These types of displays don"t have a backlight and use self-emitting pixels to display an image. Because of this, they have perfect black uniformity with no blooming around bright objects as they can turn off individual pixels. These monitors get a perfect score of ten for our black uniformity, but there are only a handful of OLED monitors we"ve tested, as they"re more common with TVs. Below you can see what an OLED looks like compared to an LED monitor.

IPS glow refers to a specific type of uniformity issue that, as the name suggests, is most common with IPS-type LCD monitors. Unlike normal uniformity issues, the cause for IPS glow is mostly the screen"s vertical viewing angle, which is why it often appears at the corners.

In a normal viewing position with your eyes being level with the center of the screen, the corners of your monitor are at a much steeper angle than the central areas. These areas of the screen can start to show the artifacts that appear when using your monitor beyond its viewing angle. Colors and brightness shift, and parts of the screen with very slight backlight bleed appear to worsen.

Unfortunately, you can"t do much to mitigate IPS glow except adjust your viewing position. The way to make sure the IPS glow is caused by the vertical viewing angles and not backlight bleed is by shifting your point of view. As you go up and down the screen, if you notice the edges further away from your eyes start to shift color, then this is the IPS glow.

The easiest way to reduce the appearance of uniformity issues is by sitting directly in front of your monitor; sitting off-axis tends to worsen the effects significantly. Otherwise, there"s no other real way to improve the black uniformity unless you want to return the monitor. There are ways to enhance it slightly, but you can rarely solve more problematic cases with these techniques. Uniformity will change across every monitor, so it"s worth trying out multiple units of the same model. If the problem persists, it"s likely that this model, in particular, can be problematic.

You can sometimes reduce backlight bleed caused by the outside frame of your monitor sitting unevenly. If your monitor has rear-accessible screws to disassemble the frame, you can try tightening or loosening them. It can have a very strong impact, so be careful with your adjustments, as it also can make the issue worse.

If you have minor clouding, you can also try a common technique that occasionally helps. With the monitor on and displaying either a black frame or our test pattern, look for the brighter areas of the screen. Using a soft cloth, gently massage the brighter spots. It might take a while, but it can be effective. Make sure to be quite gentle, though, as pressing too hard can damage your monitor.

We test for the black uniformity on a monitor to see how well it displays a bright object on a dark screen. This test is important if you tend to use your monitor in a dark environment, especially when viewing content with dark scenes, like video games or movies. A monitor with bad black uniformity can get distracting. We take a photo and measure the standard deviation of the black uniformity, both with the local dimming feature enabled and disabled. A monitor"s panel technology impacts the black uniformity, but it varies between units, so no two monitors are alike.

This is the 14.1" LCD TFT Display and backlight for the Pismo and Lombard G3 powerbook. This is the LCD and backlight only. This does not include hinges, casing, display cables, etc...The inverter cable is included as it is attached to the backlight. The display is bright and crisp and has no bad pixels. The displays in stock are used and may have minor keyboard marks and / or minor light scratches that are only cosmetic issues and are unnoticeable once the display is turned on. If you need a particular brand LCD (Samsung or LG) make that selection in the drop down menu box. You need to use the same brand as your display cables. (This is usally written on the end of the cable near the connector. ) Please also select the model Powerbook ( Lombard or Pismo ) this display will be used for to ensure proper match to your system.

All of our used parts are fully tested and in are in Grade A- to A condition unless stated otherwise. (Scratches possible, but no heavy wear or dents). Used parts designated with a Grade B condition may have slight damage such as small dents or deep scratches that are noticeable but should not affect the functionality of the device. Used parts designated as Non-Working will be parts that will need additional repair in order to be functional. This may include physical or liquid damage. All of our parts (new and used) come with a one year warranty direct from us.

Let us start with the basics first; refresh the knowledge about TN and LCD displays in general, later we will talk about TFTs (Thin Film Transistors), how they differ from regular monochrome LCD displays. Then we will go on to the ghosting effect, so we will not only discuss the technology behind the construction of the TFT, but also some phenomena, like the ghosting effect, or grayscale inversion, that are important to understand when using an LCD TFT display.

Next, we will look at different technologies of the TFT LCD displays like TN, IPS, VA, and of course about transmissive and transflective LCD displays, because TFT displays also can be transmissive and transflective. In the last part we will talk about backlight.

Let us start with a short review of the most basic liquid crystal cell, which is the TN (twisted nematic) display. On the picture above, we can see that the light can be transmit through the cell or blocked by the liquid crystal cell using voltage. If you want to learn more about monochrome LCD displays and the basics of LCD displays, follow this link.

What is a TFT LCD display and how it is different from a monochrome LCD display? TFT is called an active display. Active, means we have one or more transistors in every cell, in every pixel and in every subpixel. TFT stands for Thin Film Transistor, transistors that are very small and very thin and are built into the pixel, so they are not somewhere outside in a controller, but they are in the pixel itself. For example, in a 55-inch TV set, the TFT display contains millions of transistors in the pixels. We do not see them, because they are very small and hidden, if we zoom in, however, we can see them in every corner of each pixel, like on the picture below.

On the picture above we can see subpixels, that are basic RGB (Red, Green, Blue) colors and a black part, with the transistors and electronic circuits. We just need to know that we have pixels, and subpixels, and each subpixel has transistors. This makes the display active, and thus is called  the TFT display. TFT displays are usually color displays, but there are also monochrome TFT displays, that are active, and have transistors, but have no colors. The colors in the TFT LCD display are typically added by color filters on each subpixel. Usually the filters are RGB, but we also have RGBW (Red, Green, Blue, White) LCD displays with added subpixels without the filter (White) to make the display brighter.

What is interesting, the white part of the RGB and RGBW screen will look exactly the same from a distance, because the lights are mixed and generate white light, but when we come closer to the screen, we will not see white light at all.

Going a little bit deeper, into the TFT cell, there is a part inside well known to us from the monochrome LCD display Riverdi University lecture. We have a cell, liquid crystal, polarizers, an ITO (Indium Tin Oxide) layer for the electrodes, and additionally an electronic circuit. Usually, the electronic circuit consists of one transistor and some capacitors to sustain the pixel state when we switch the pixel OFF and ON. In a TFT LCD display the pixels are much more complicated because apart from building the liquid crystal part, we also need to build an electronic part.

That is why TFT LCD display technologies are very expensive to manufacture. If you are familiar with electronics, you know that the transistor is a kind of switch, and it allows us to switch the pixel ON and OFF. Because it is built into the pixel itself, it can be done very quickly and be very well controlled. We can control the exact state of every pixel not only the ON and OFF states, but also all the states in between. We can switch the light of the cells ON and OFF in several steps. Usually for TFT LCD displays it will be 8-bit steps per color, so we have 256 steps of brightness for every color, and every subpixel. Because we have three subpixels, we have a 24-bit color range, that means over 16 million combinations, we can, at least theoretically, show on our TFT LCD display over 16 million distinct colors using RGB pixels.

Now that we know how the TFT LCD display works, we can now learn some practical things one of which is LCD TFT ghosting. We know how the image is created, but what happens when we have the image on the screen for a prolonged time, and how to prevent it. In LCD displays we have something called LCD ghosting. We do not see it very often, but in some displays this phenomenon still exists.

If some elements of the picture i.e., your company logo is in the same place of the screen for a long period of time, for couple of weeks, months or a year, the crystals will memorize the state and later, when we change the image, we may see some ghosting of those elements. It really depends on many conditions like temperature and even the screen image that we display on the screen for longer periods of time. When you build your application, you can use some techniques to avoid it, like very rapid contrast change and of course to avoid the positioning the same image in the same position for a longer time.

You may have seen this phenomenon already as it is common in every display technology, and even companies like Apple put information on their websites, that users may encounter this phenomenon and how to fix it. It is called image ghosting or image persistence, and even Retina displays are not free of it.

Another issue present in TFT displays, especially TN LCD displays, is grayscale inversion. This is a phenomenon that changes the colors of the screen according to the viewing angle, and it is only one-sided. When buying a TFT LCD display, first we need to check what kind of technology it is. If it is an IPS display, like the Riverdi IPS display line, then we do not need to worry about the grayscale inversion because all the viewing angles will be the same and all of them will be very high, like 80, 85, or 89 degrees. But if you buy a more common or older display technology type, like the TN (twisted nematic) display, you need to think where it will be used, because one viewing angle will be out. It may be sometimes confusing, and you need to be careful as most factories define viewing direction of the screen and mistake this with the greyscale inversion side.

On the picture above, you can see further explanation of the grayscale inversion from Wikipedia. It says that some early panels and also nowadays TN displays, have grayscale inversion not necessary up-down, but it can be any angle, you need to check in the datasheet. The reason technologies like IPS (In-Plane Switching), used in the latest Riverdi displays, or VA, were developed, was to avoid this phenomenon. Also, we do not want to brag, but the Wikipedia definition references our website.

We know already that TN (twisted nematic) displays, suffer from grayscale inversion, which means the display has one viewing side, where the image color suddenly changes. It is tricky, and you need to be careful. On the picture above there is a part of the LCD TFT specification of a TN (twisted nematic) display, that has grayscale inversion, and if we go to this table, we can see the viewing angles. They are defined at 70, 70, 60 and 70 degrees, that is the maximum viewing angle, at which the user can see the image. Normally we may think that 70 degrees is better, so we will choose left and right side to be 70 degrees, and then up and down, and if we do not know the grayscale inversion phenomena, we may put our user on the bottom side which is also 70 degrees. The viewing direction will be then like a 6 o’clock direction, so we call it a 6 o’clock display. But you need to be careful! Looking at the specification, we can see that this display was defined as a 12 o’clock display, so it is best for it to be seen from a 12 o’clock direction. But we can find that the 12 o’clock has a lower viewing angle – 60 degrees. What does it mean? It means that on this side there will be no grayscale inversion. If we go to 40, 50, 60 degrees and even a little bit more, probably we will still see the image properly. Maybe with lower contrast, but the colors will not change. If we go from the bottom, from a 6 o’clock direction where we have the grayscale inversion, after 70 degrees or lower we will see a sudden color change, and of course this is something we want to avoid.

To summarize, when you buy older technology like TN and displays, which are still very popular, and Riverdi is selling them as well, you need to be careful where you put your display. If it is a handheld device, you will see the display from the bottom, but if you put it on a wall, you will see the display from the top, so you need to define it during the design phase, because later it is usually impossible or expensive to change the direction.

We will talk now about the other TFT technologies, that allow us to have wider viewing angles and more vivid colors. The most basic technology for monochrome and TFT LCD displays is twisted nematic (TN). As we already know, this kind of displays have a problem with grayscale inversion. On one side we have a higher retardation and will not get a clear image. That is why we have other technologies like VA (Vertical Alignment), where the liquid crystal is differently organized, and another variation of the TFT technology – IPS which is In-Plane Switching. The VA and IPS LCD displays do not have a problem with the viewing angles, you can see a clear image from all sides.

Nowadays all TV sets, tablets and of course mobile phones are IPS or VA. You can turn them around and see the image clear from all sides. But, for monitor applications the TN technology is still widely used, because the monitor usually is in front of you and most of the time you look directly at it, from top, left or right side, but very rarely from the bottom, so the grayscale inversion viewing angle can be placed there. This technology still is very practical because it is affordable and has some advantages for gamers because it is very fast.

Apart from the different organization of the liquid crystals, we also organize subpixels a little bit differently in a VA and IPS LCD displays. When we look closer at the TN display, we will just see the subpixels with color filters. If we look at the VA or IPS display they will have subpixels of subpixels. The subpixels are divided into smaller parts. In this way we can achieve even wider viewing angles and better colors for the user, but of course, it is more complicated and more expensive to do.

The picture above presents the TN display and grayscale inversion. For IPS or VA technology there is no such effect. The picture will be the same from all the sides we look so these technologies are popular where we need wide viewing angles, and TN is popular where we don’t need that, like in monitors. Other advantages of IPS LCD displays are they give accurate colors, and wide viewing angles. What is also important in practice, in our projects, is that the IPS LCD displays are less susceptible to mechanical force. When we apply mechanical force to the screen, and have an optically bonded touch screen, we push the display as well as squeeze the cells. When we have a TN display, every push on the cell changes the image suddenly, with the IPS LCD displays with in-plane switching, different liquid crystals organization, this effect is lesser. It is not completely removed but it is much less distinct. That is another reason IPS displays are very popular for smartphones, tablets, when we have the touchscreens usually optically bonded.

If we wanted to talk about disadvantages, there is a question mark over it, as some of them may be true, some of them do not rely on real cases, what kind of display, what kind of technology is it. Sometimes the IPS displays can have higher power consumption than others, in many cases however, not. They can be more expensive, but not necessarily. The new IPS panels can cost like TN panels, but IPS panels definitely have a longer response time. Again, it is not a rule, you can make IPS panels that are very fast, faster than TN panels, but if you want the fastest possible display, probably the TN panel will be the fastest. That is why the TN technology is still popular on the gaming market. Of course, you can find a lot of discussions on the internet, which technology is better, but it really depends on what you want to achieve.

Now, let us look at the backlight types. As we see here, on the picture above, we have four distinct types of backlight possible. The most common, 95 or 99 per cent of the TFT LCD displays on the market are the transmissive LCD display type, where we need the backlight from the back. If you remember from our Monochrome LCD Displays lecture, for transmissive LCD displays you need the backlight to be always on. If you switch the backlight off, you will not see anything. The same as for monochrome LCD displays, but less popular for TFT displays, we have the transflective LCD display type. They are not popular because usually for transflective TFT displays, the colors lack in brightness, and the displays are not very practical to use. You can see the screen, but the application is limited. Some transflective LCD displays are used by military, in applications where power consumption is paramount; where you can switch the backlight off and you agree to have lower image quality but still see the image. Power consumption and saving energy is most important in some kind of applications and you can use transflective LCD displays there. The reflective type of LCD displays are almost never used in TFT. There is one technology called Low Power Reflective Displays (LPRD) that is used in TFT but it is not popular. Lastly, we have a variation of reflective displays with frontlight, where we add frontlight to the reflective display and have the image even without external light.

Just a few words about Low Power Reflective Displays (LPRD). This kind of display uses environmental light, ambient light to reflect, and produce some colors. The colors are not perfect, not perfectly clear, but this technology is becoming increasingly popular because it allows to have color displays in battery powered applications. For example, a smartwatch would be a case for that technology, or an electrical bike or scooter, where we can not only have a standard monochrome LCD display but also a TFT LCD color display without the backlight; we can see the image even in

strong sunlight and not need backlight at all. So, this kind of TFL LCD display technology is getting more and more popular when we have outdoor LCD displays and need a low power consumption.

On the picture above, we have some examples of how transmissive and reflective LCD displays work in the sunlight. If we have a simple image, like a black and white pattern, then on a transmissive LCD display, even with 1000 candela brightness, the image probably will be lower quality than for a reflective LCD display; if we have sunlight, we have very strong light reflections on the surface of the screen. We have talked about contrast in more detail in the lecture Sunlight Readable Displays. So, reflective LCD displays are a better solution for outdoor applications than transmissive LCD displays, where you need a really strong backlight, 1000 candela or more, to be really seen outdoors.

To show you how the backlight of LCD displays is built, we took the picture above. You can see the edge backlight there, where we have LEDs here on the small PCB on the edge, and we have a diffuser that distributes the light to the whole surface of LCD screen.

In addition to the backlight, we have something that is called a frontlight. It is similar to backlight, it also uses the LEDs to put the light into it, but the frontlight needs to be transparent as we have the display behind. On the example on the picture above we can see an e-paper display. The e-paper display is also a TFT display variation, but it is not LCD (liquid crystal), it is a different technology, but the back of the display is the same and it is reflective. The example you see is the Kindle 4 eBook reader. It uses an e-paper display and a frontlight as well, so you can read eBooks even during the night.

Newhaven 160x100 graphic Chip-On-Glass (COG) Liquid Crystal Display shows dark pixels on a gray background. This reflective LCD Display is visible with high ambient light while offering a wide operating temperature range from -20 to 70 degrees Celsius. This NHD-C160100CZ-RN-FBW display has an optimal view of 6:00 and has no backlight. This display operates at 3V supply voltage and is RoHS compliant.

Adjust the length, position, and pinout of your cables or add additional connectors. Get a cable solution that’s precisely designed to make your connections streamlined and secure.

Choose from a wide selection of changes including shape, size, pinout, and component layout of your PCB to make it a perfect fit for your application.

Our company specializes in developing solutions that arerenowned across the globe and meet expectations of the most demanding customers. Orient Display can boast incredibly fast order processing - usually it takes us only 4-5 weeks to produce LCD panels and we do our best to deliver your custom display modules, touch screens or TFT and IPS LCD displays within 5-8 weeks. Thanks to being in the business for such a noteworthy period of time, experts working at our display store have gained valuable experience in the automotive, appliances, industrial, marine, medical and consumer electronics industries. We’ve been able to create top-notch, specialized factories that allow us to manufacture quality custom display solutions at attractive prices. Our products comply with standards such as ISO 9001, ISO 14001, QC 080000, ISO/TS 16949 and PPM Process Control. All of this makes us the finest display manufacturer in the market.

Without a shadow of a doubt, Orient Display stands out from other custom display manufacturers. Why? Because we employ 3600 specialists, includingmore than 720 engineers that constantly research available solutions in order to refine strategies that allow us to keep up with the latest technologiesand manufacture the finest displays showing our innovative and creative approach. We continuously strive to improve our skills and stay up to date with the changing world of displays so that we can provide our customers with supreme, cutting-edge solutions that make their lives easier and more enjoyable.

Customer service is another element we are particularly proud of. To facilitate the pre-production and product development process, thousands of standard solutions are stored in our warehouses. This ensures efficient order realization which is a recipe to win the hearts of customers who chose Orient Display. We always go to great lengths to respond to any inquiries and questions in less than 24 hours which proves that we treat buyers with due respect.

Choosing services offered by Orient Display equals a fair, side-by-side cooperation between the customer and our specialists. In each and every project, we strive to develop the most appropriate concepts and prototypes that allow us to seamlessly deliver satisfactory end-products. Forget about irritating employee turnover - with us, you will always work with a prepared expert informed about your needs.

In a nutshell, Orient Display means 18% of global market share for automotive touch screen displays, emphasis on innovation, flexibility and customer satisfaction.Don"t wait and see for yourself that the game is worth the candle!

What you"re experiencing is a blown inverter. This is the part of the monitor that directly controls the backlighting. The fact that the light comes on at all shows that the lights themselves work.

Finding a specific inverter can be a pain, but I"ve found that eBay* is your friend in these cases. I stick with "Buy it Now" and "Top Sellers" with 94-98% approval and at least 1500 transactions completed. Read the descriptions CAREFULLY and know what you"re getting. Also be sure you know their return or exchange policy...almost all sellers I"ve seen will not accept returns, but most will accept exchanges in case of dead-on-arrival.

I deal with blown inverters on laptops all the time. Working on a G4 Titanium DVI (A1025) now with that exact problem. Found the guide right here on iFixit. I"d never worked on a Mac laptop before, so I wanted to be sure to do it right...I need not have feared, as it"s easier than any other laptop inverter I"ve ever replaced. (The same is NOT true for most of them, apparently!)

I didn"t find any manuals here for replacing inverters on LCD monitors, but I might do a couple if I get a chance. While the functional part is the same, the make, model, and procedure for doing it is a bit different for almost every monitor out there. Just Google (or Bing or Yahoo or *search engine here*) it and you"ll probably find one.

Unfortunately, I had less luck with the service manual. I found a couple that claimed to have it, but one wanted registration (didn"t really want to do that) and another wanted money, but I didn"t see how much. Wish I could help more on that part.

Since I wrote this, Amazon (among other places) have started offering products from third-party sellers/resellers and are fine alternatives to eBay. However, the same cautions apply. Know who you"re buying from. Do your due diligence. I"m not here to promote any one source, I simply provided my own experience as a starting point. Good luck!