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TFT LCDs: Their Design and Function

Views: 272     Author: Wendy     Publish Time: 2023-06-21      Origin: Site


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TFT LCDs: Their Design and Function

Are LCD Screens Dangerous?

Compared to CRTs (Cathode Ray Tubes), LCDs (liquid crystal displays) use a lot less electricity and are lighter and smaller. Presently, it is the display technology that is most widely used.  Mobile phones, tablets, TVs, laptops, computer monitors, ATMs, kiosks, household appliances, the Internet of Things, automobiles, solar panels, etc. all make extensive use of it. The volumes are increasing while the sizes are expanding. Many people are concerned about the safety of LCD screens and whether they are really dangerous. There wasn't much study done on it. On the internet, there are many articles with conflicting facts.  It is crucial to consider the safety issue from the viewpoint of a reputable manufacturer of LCD panels. A thorough comprehension of the LCD foundation is necessary in order to fully comprehend the question. As color displays are prevalent in large-screen LCDs, we shall concentrate on TFT LCDs.

The Structure and Operation of TFT LCDs: An Introduction to LCD Displays

With liquid crystal material sandwiched between two glass plates, TFT LCD Display (Thin-Film-Transistor Liquid Crystal Display) technology features a sandwich-like design. The exact amount of light that can pass and the colors that are produced are controlled by two polarizer filters, color filters (RGB, red/green/blue), and two alignment layers. In an active matrix, each pixel is connected with a transistor that includes a capacitor, allowing each sub-pixel to keep its charge rather than requiring an electrical charge to be transmitted each time it has to be updated.  The TFT layer regulates light flow. The color is displayed using a color filter, and your viewable screen is housed in the top layer. using an electrical charge to modify the molecular structure of the liquid crystal material to allow different backlight wavelengths to "pass-through". The TFT display's active matrix is constantly changing and refreshes quickly based on the signal received from the control device.

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

The TFT screen needs a white, bright backlight to produce the image because it cannot emit light like an OLED display can. Modern panels generate their light using LED backlight (light emitting diodes), which by design uses less power and takes up less space.

LED backlight, drive circuitry, and TFT display screen are all included in a TFT display module.

Okay, let's examine each layer individually.


In reality, polarizers are constructed from multiple layers of regular plastic. PVA (polyvinyl alcohol) and TAC (three cellulose acetate film) make up the majority of them. Both are regular, secure polymers. Flame retardants are used in most plastic nowadays to keep it from catching fire.


Soda lime and alkaline borosilicate are the two common types of glass utilized. Each is secure.


This type of semiconductor primarily consists of metal (gold, aluminum, etc.) and silicon. They're secure.

Color filter:

They are formed of photosensitive polymers and are quite thin. The method used for the procedure is photolithography. They're secure.

Driving Circuitry:

The driving circuitry for LCDs is constructed of the same materials as other electronics. Printed circuit board and integrated circuit are both present.

Backlight and Liquid Crystal Material:

Both are the most suspicious. We will dive deep into these two parts.




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