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

Microcomputer applications, Calculate how many customers there are for each...

Calculate how many customers there are for each lawn size. Name this sheet

How to identify window area - raster graphics and clipping, A convex polygo...

A convex polygonal region having n- vertices {P 0 , P 1 , P 2 ..., P n - 1 , P n , P 0 } or lattice points to be identified by the user includes the convex window area. To be exact

Image capture formats, Image Capture Formats: Video cameras appear in...

Image Capture Formats: Video cameras appear in two various image capture formats: progressive and interlaced scan. Interlaced Scan It is a technique of enhancing the

Characteristics of digital video, Digital video can be characterized by a f...

Digital video can be characterized by a few variables: Frame rate : various frames displayed per second. The illusion of motion may be experienced on frame rates as low as 12 f

What is an axonometric orthographic projection, What is an axonometric orth...

What is an axonometric orthographic projection and cabinet projection? The orthographic projection can show more than one face of an object.  Such an orthographic projection i

Region filling, what is region filling? give details

what is region filling? give details

What is a blobby object, What is a Blobby object?  Some objects do not ...

What is a Blobby object?  Some objects do not handle a fixed shape, but change their surface characteristics in sure motions or when in proximity to other objects. That is call

Construction of an isometric projection - transformation, Construction of a...

Construction of an Isometric Projection - Transformation In this projection, the direction of projection i.e. d = (d 1 ,d 2 ,d 3 ) makes an identical angles with all the 3-pr

Silicon graphics - hardware for computer animation, Silicon Graphics - Hard...

Silicon Graphics - Hardware for computer animation The SGI platform is one of the most broadly used hardware platforms in professional or broadcast feature computer animation

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