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Do LCD screens pose a risk?

Views: 206     Author: Reshine Display      Publish Time: 2023-07-28      Origin: Site

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Do LCD screens pose a risk?

Compared to CRTs (Cathode Ray Tubes), LCDs (liquid crystal displays) use a lot less power and are lighter and thinner. Presently, it is the display technology that is most widely used. Mobile phones, tablets, TVs, laptops, computer monitors, ATMs, kiosks, home appliances, the Internet of Things, automobiles, solar panels, etc. all make extensive use of it. The quantities are increasing while the sizes are expanding. There are numerous concerns regarding the safety, danger, and potential impact of LCD screens on the environment.


There wasn't much study done on it. It is crucial to consider the safety issue from the perspective of a reputable manufacturer of LCD panels. To have a thorough understanding of the question, we must first understand the LCD basis. Because the majority of large-size LCDs are color displays, we will concentrate on TFT LCDs.


TFT LCD Structure and Operation: An Introduction to LCD Displays

TFT LCD Display (Thin-Film-Transistor Liquid Crystal Display) technology is sandwiched between two glass plates and has a sandwich-like structure. Two polarizer filters, color filters (RGB, red/green/blue), and two alignment layers determine how much light can pass and which colors are produced. In an active matrix, each pixel is paired with a transistor that includes a capacitor, which allows each sub-pixel to retain its charge rather than requiring an electrical charge to be sent each time it needs to be changed. The TFT layer regulates light flow. A color filter displays the color, and your visible screen is housed in a top layer.

TFT LCD Display Structure

Using an electrical charge to cause the liquid crystal material's molecular structure to change allows different wavelengths of the backlight to "pass through." The TFT display's active matrix is constantly changing and refreshing in response to the incoming signal from the control device.


The underlying density (resolution) of the color matrix and TFT layout determine the pixels of TFT displays. The more pixels there are, the more detail there is. TFT displays are defined by their available screen size, power consumption, resolution, and interface (how to connect).


Because a TFT screen cannot emit light like an OLED display, it must be used in conjunction with a back-light of white bright light to generate the image. Newer panels use an LED backlight (light emitting diodes) to generate light, which uses less power and requires less depth by design.


A TFT display module consists of a TFT display screen, an LED backlight, and driving circuitry.

Let's take it one layer at a time.


1. Polarizers: The polarizer is constructed of several layers of regular plastic. PVA (polyvinyl alcohol) and TAC (three cellulose acetate films) make up the majority of them. Both polymers are safe for everyday use. Flame retardants are used in most plastic today to keep it from catching fire.

Polarizer Structure

2. Glass: Typically, soda lime and alkaline borosilicate glass are used. Each is secure.-TFT: It is a type of semiconductor made primarily of metals (gold, aluminum, etc.) and silicon. They're secure.


3. Color filters are made of photoresist polymers and are extremely thin. It is carried out using a photolithography technique. They're secure.


4. Driving Circuitry: The driving circuitry for LCDs is constructed of the same materials as other electronics. The printed circuit board and integrated circuit are both present.


5. Liquid crystal material and backlight are both the most suspicious. 


Vapors of Mercury

According to some online articles, the LCD screen produces visible light during the viewing process using mercury. It is the cause of the possibility of vapors escaping from places where the screen cracks. The risk of adverse effects like allergic reactions, skin rashes, and even birth defects exists even though mercury levels are typically low.


Our understanding is that it is a lie. The LCD screen doesn't contain any mercury at all, according to our analysis of its structure above. LCD screens require a light source to be seen; they are unable to illuminate themselves. The light sources can be the sun, ambient light, or a backlight installed behind LCD screens.


Backlights come in two varieties: CCFL (cold cathode fluorescent lamp) backlight and LED (light emitting diode) backlight. Both are frequently utilized for our home's general lighting. Mercury and LCD screens may be connected. It might be a compact fluorescent light (CCFL), which generates fluorescent light by using toxic metals and their salts, such as mercury. However, you may have noticed that the majority of LCD manufacturers promote LED displays, which are LCD displays with LED backlighting.

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