The Ultimate Guide To Lcd Display Screen
LCD screens are found everywhere. Every home and office probably has one or more devices with an LCD display screen. These devices include your computer monitor, smartphones, watches, clocks or even calculators. Although there are other display technologies available, Liquid Crystal Display technology has become more popular.
Have you wondered about the working principle of an LCD screen, its components, lifespan, and different LCD displays? When you know these things, you can appreciate your screens all the more. Being familiar with LCD screen features, you can easily purchase high-quality LCD displays for your devices to replace the old ones.
Here, we are providing you with some basic information that you should know about LCD displays.
What is an LCD Screen?
LCD is an acronym for liquid crystal display, and it is a popular technology being used in electronic displays. As its name shows, it uses liquid-filled crystals to produce images. Liquid crystals have the property to modulate light. That’s why LCDs are particularly effective for this purpose. This technology has replaced the light-emitting diode (LED) and cathode ray tube (CRT) technology. LCD displays do not just look different from LEDs, but it also has significant differences in operation. LCDs consume less energy than LEDs and CRTs because they work on the principle of blocking light instead of emitting it.
How Does LCD Displays Work?
“A liquid crystal display is a flat panel display that uses light-modulating properties of liquid crystals and polarisers”. The screen panel is embedded with the liquid crystals that have properties in between solids and liquids. These crystals can flow like a liquid, but their molecules have a solid crystal orientation.
The liquid crystals in LCD displays are responsible for producing images, and they do not emit light. The backlight in the LCD provides an even light source behind the screen. This light illuminates the liquid crystals. Liquid crystals are twisted by applying electrical voltage. They block polarised light, when they are off and reflect blue, red or green light when activated. Each LCD screen consists of several tiny colour blocks known as pixels. These pixels display images on the screen. Old LCDs use passive matrix screens, in which the images appear blurry when images are quickly moved on screen. Advanced LCDs use active-matrix technology that contains thin-film transistors, and it appears more responsive than passive matrix.
In LCDs, pixels are regulated by liquid crystals for rotating polarised light. Each pixel consists of a polarising filter at front and back side, and twisted liquid crystals are located between these filters. Tiny electronic transistors are used to on and off the liquid crystals. Thus, an LCD display consists of millions of pixels, liquid crystals, transistors and polarising filters. All these components work together to display an image on the screen.
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The Basics Of LCD Displays
While there are various configurations about LCD displays, most of them are designed in the same manner. A liquid crystal display has liquid crystals sandwiched between two glass sheets. There are transparents electrodes through which voltage is applied. When there is no voltage liquid crystals remain parallel along the glass surface.
With the application of voltage, these crystals change the direction and turn vertical to the glass surface. The optical characteristics of crystals vary according to their orientation. The quantity of transmitted light is controlled by motion of liquid crystals and direction of polarisation. This is the basic principle that is used in LCDs to display images.
Benefits Of LCD Displays
There are several other technologies available, but Liquid Crystal Display is popular because it offers more benefits. Here are the top advantages of LCD screens:
An important advantage of LCDs is that they have a long lifespan. Although LCDs do not last forever, they have a longer lifetime as compared to other display devices. Typically an LCD can last for up to 60,000 hours. The lifespan depends on how frequently you use it.
Another advantage of LCD screens is that they are energy efficient. They require power to illuminate their pixels, but they use less power as compared to LED and CRT devices. If we compare it with Cathode Ray Tube, an LCD screen consumes 25% less energy. Therefore, LCDs are cost-effective and can reduce your utility bills. You can reduce your expenses by choosing an LCD device over a non-LCD device.
No Screen Burn-In
When you have an LCD device, there is no need to worry about image burn-in. Screen burn-in or image burn-in is a phenomenon in which an image remains in the display even when it has been changed. It is commonly found in traditional CRTs. LCDs are made up of organic material, so there is no issue of image burn-in.
LCDs need backlighting to illuminate their pixels, and it is achieved by using light-emitting diodes. It is the most common type of backlighting that is used by manufacturers. LED backlighting is a preferred choice as it is effective and energy-efficient. LED bulbs are located in the back of LCDs to illuminate the liquid pixels.
Support Small and Low Profile Sizes
LCD displays come in all sizes and designs. Some of which are large in size, and others are small, having narrow or low profile design. For example, tablets and smartphones use LCD technology, while old display technologies do not support small and low profile designs. LCD replacements are easily available in the market. You can purchase iWatch LCDs and LCDs for mobiles from TechPro at wholesale price.
LCD Display Lifespan
In recent years the Cathode Ray Tube and LEDs have faded in favour of LCDs. If you are going to purchase an LCD display for your computer, TV or any other device, you might think about how long it will last. The lifespan of LCD depends on the following factors:
- Display screen size
- Frequency of use
- Backlighting source
- Operating environment of LCD screen
- Storage conditions
The lifespan of LCD screens is two to three times longer than CRTs. Most LCD monitors have a lifespan of 30,000 to 60,000 hours which is equal to 5-7 years if you monitor for 24 hours a day. The lifetime can be 10 to 20 years if you use LCD monitors 8 hours a day, five days a week. The life expectancy of a backlight is a major thing that determines the lifespan of an LCD because liquid crystals do not give off light themselves.
How TFT LCD Touch Screen Display Works
TFT is a thin film transistor liquid crystal display that uses thin-film transistors technology to improve image quality. The Latest LCD displays use an active matrix that consists of thin-film transistors. Each pixel of the active matrix is paired with a transistor. These transistors give each subpixel the ability to retain charge instead of requiring an electrical charge every time it needs to be changed. Thus, a TFT display is more responsive rather than regular LCD monitors because they use two technologies together to produce a clear image.TechPro is a leading wholesale provider of LCDs in the UK. No matter whatever for which device you want to purchase an LCD screen replacement you can find it in our vast range of LCDs.