Lcd - liquid crystal display, Computer Graphics

Assignment Help:

LCD - Liquid Crystal Display

  • A liquid crystal display consists of two glass plates each containing a light polarizer. One glass plate contains vertical polarizer and the other plate having horizontal polarizer.
  • Horizontal polarizer acts as a filter, allowing only the horizontal component of light to pass through and vertical polarizer allows only the vertical component of light to pass through.
  • Rows of horizontal conductors on one glass plate and columns of vertical conductors on the other glass plate are built in to address individual pixels. The intersection of these rows and columns define the pixel grid. The conductors are transparent.
  • A liquid crystal layer exists between the two glass plates. The liquid crystal means a compound which has crystalline structure of its molecules, yet it flows like a liquid.
  • Ambient light is captured at one glass plate, vertically polarized and then is rotated (phase of the light wave changed) to horizontal polarity during the period it passes through the liquid crystal layer. Then it passes through the horizontal filter. Light is then reflected back through all the layers to the viewer, giving an appearance of lightness.
  • However, if the liquid crystal molecules are charged, they become aligned and no longer allow the light to change its polarity when the light passes through them. If this occurs, no light can pass through the horizontal filter, so the screen appears dark. To do this we simply apply voltage between two intersecting conductors residing in two glass plates.
  • Crystals can be dyed to provide color.
  • Screen is refreshed at a rate of 60 frames per seconds using a refresh buffer. An LCD may be backlit, so as not to be dependent on ambient light. This is known as passive matrix LCD. However, ambient light is rarely used now a days.
  • Most of the LCD are manufactured using active matrix LCD. In active matrix LCD, transistors are placed at every pixel location to control voltage and to prevent charge from gradually leaking out from the liquid crystal cells.
  • TFT (thin film transistor) is most popular LCD technology today.

Related Discussions:- Lcd - liquid crystal display

Reflection, What is the advantages and disadvantages of reflection ?

What is the advantages and disadvantages of reflection ?

What does refreshing of the screen mean, What does refreshing of the screen...

What does refreshing of the screen mean? Some method is required for maintaining the picture on the screen. Refreshing of screen is completed by keeping the phosphorus glowing

Compute the position of the car on the road, An animation demonstrates a ca...

An animation demonstrates a car driving along a road that is given by a Bezier curve along with the subsequent control points:  X k 0 5

What is orthographic parallel projection, What is orthographic parallel pro...

What is orthographic parallel projection?  When the direction of the projection is normal (perpendicular) to the view plane then the projection is called as orthographic paral

Bezier curve, Q. What is a Bezier Curve? What are blending function? Write ...

Q. What is a Bezier Curve? What are blending function? Write an algorithm for generating Bezier Curves. A curve which has the following properties is called Bezier Curve: 1. A

Scan conversion - 2d shape primitives, Scan conversion: For display of...

Scan conversion: For display of a continuously defined object, a method to map a continuous abstract object or shape into a discrete plane of computer display is needed.  This

Text generation and character generation techniques, Write short notes on T...

Write short notes on Text generation.   OR Character Generation Techniques  Character Generation Techniques   Two different representations are used for storing computer fon

Describe fully the term preflight, Question: Adobe InDesign software ...

Question: Adobe InDesign software is used to create works such as posters, flyers, brochures, magazines and books. Designers and graphics production artists are the principa

Application of coherence in visible surface detection method, explainapplic...

explainapplication of coherence in visible surface detection method

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd