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

Area-subdivision method-computer graphics, Normal 0 false fal...

Normal 0 false false false EN-US X-NONE X-NONE

What is the purpose of saving selections, Question 1: (a) Once a select...

Question 1: (a) Once a selection is made, what area of the image can be edited? (b) What is the purpose of saving selections? (c) How can you move a selection while you a

Assumption for diffuse reflection - polygon rendering, Assumption for Diffu...

Assumption for Diffuse Reflection - Polygon Rendering  i) the diffuse reflections by the surface are scattered along with equal intensity in each direction, independent of vie

Polygon clipping - raster graphics and clipping, Polygon Clipping - Raster ...

Polygon Clipping - Raster Graphics and Clipping After considerate the idea of line clipping and its algorithms, we can currently extend the idea of line clipping to polygon cl

Positioning Techniques, Explain Positioning Techniques in computer Graphics...

Explain Positioning Techniques in computer Graphics in detail

Refresh buffer, what is refresh buffer/ identify the content and organisati...

what is refresh buffer/ identify the content and organisation of the refresh buffer for the case of raster display and vector display.

How to use illumination model to calculate vertex intensity, How to utilize...

How to utilize illumination model to calculate vertex intensity: For such we interpolate intensities beside the polygon edges, for all scan line the intensity at the intersecti

How does resolution of a system influence graphic display, 1. How does the...

1. How does the resolution of a system influence graphic display? Ans. In a high resolution system the adjacent pixels are so near spaced such approximated line-pixels lie extr

Transformation for 3-d reflection, Transformation for 3-D Reflection F...

Transformation for 3-D Reflection For 3-Dimensions reflections, we should to know the reference plane, which is a plane about that reflection is to be considered. Remember tha

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