Liquid Crystal Display Argumentative Essay Example

grooves on a surface. Classification of liquid crystals includes Smectic and cholesteric. Smectic can be further classified as smectic C, where the molecules in each layer tilt at an angle compared to the previous layer. In cholesteric liquid crystals, molecules slightly twist from one layer to the next, creating a spiral design. Ferro-electric liquid crystals (FLC), which combine both smectic and cholesteric molecules, have a microsecond switching response time due to their spiral nature. This makes FLCs useful in advanced displays. Liquid crystal molecules are also classified as thermotropic and lyotropic crystals.

The former is responsive to changes in pressure and temperature, and can be segmented into nematic and isotropic liquid crystals. Nematic liquid crystals exhibit a fixed pattern, while isotropic liquid crystals are randomly distributed. The characteristics of lyotropic crystals depend on the solvent they are combined with, making them valuable in the production of detergents and soaps.

Making an LCD involves certain considerations. The structure of an LCD should be adjustable according to the applied electric current. The light utilized in the LCD can be polarized. The liquid crystals must possess the ability to both transmit and modify polarized light. Additionally, there are transparent substances that allow for electrical conduction.

To create an LCD, two polarized glass pieces are necessary. The glass piece without a polarized film should be rubbed with a special polymer that creates microscopic grooves aligned in the same direction as the polarizing film. A coating of nematic liquid crystals is then applied to one of the filters.

The grooves on the filter will align the first layer of molecules. A second piece of glass and polarizing film must be

added perpendicular to the first piece. Each subsequent layer of TN molecules will continue twisting until the top layer is at a 90-degree angle to the bottom layer. Initially, the first filter will become polarized when the light strikes it. As the light passes through each layer, it is guided to the next layer by the molecules. In this process, the molecules change the plane of vibration of the light to match their own angle.

When light reaches the opposite side of the liquid crystal substance, it vibrates in alignment with the final layer of molecules. The light can only enter if the second polarized glass filter is in alignment with the final layer. Refer to the figure below. [pic] working of lcd The main principle of liquid crystal molecules is that they untwist when an electric current is applied, resulting in a change in the angle of the light passing through them. This, in turn, alters the angle of the top polarizing filter. As a result, only a small amount of light is able to pass through that specific area of the LCD.

The area becomes darker in comparison to others as a reflective mirror is placed in the back for creating an LCD screen. Additionally, an electrode plane composed of indium-tin oxide is positioned on top, along with a glass containing a polarizing film on the bottom. The entire LCD area must be encompassed by a common electrode, followed by the liquid crystal substance above it. Another rectangular electrode is present on the bottom of another piece of glass, with another polarizing film on top. It is important to note that both glass

pieces are positioned at right angles.

When there is no current, the light passes through the front of the LCD and is reflected by the mirror, bouncing back. The liquid crystals between the common-plane electrode and the rectangle-shaped electrode untwist due to the current from a temporary battery connected to the electrode. This prevents the light from passing through, resulting in a blank rectangular area. Colour Liquid Crystal Display (LCD) technology enables pictures to be displayed in colors. To accomplish this, each color pixel is made up of three sub-pixels with red, green, and blue color filters.

Combining sub-pixels in LCDs requires a significant number of transistors. Issues with these transistors can result in the appearance of bad pixels. The size of these LCDs is a major drawback, as manufacturers typically aim to minimize height rather than increase it. This is due to the necessity of additional transistors and pixels for increasing length, which in turn raises the likelihood of encountering bad pixels. The repair of LCDs with bad pixels is often extremely challenging or even impossible, greatly impacting their marketability.