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In the past decade, rapid technological progress and a

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LCDs [#permalink] New post 08 Dec 2009, 01:18
In the past decade, rapid technological progress and a greater demand for high-quality digital imaging have led to dramatic advances in video display technology. The dominant technology currently used in most consumer product displays is the active matrix liquid crystal diode display(LCD).
LCDs apply thin-film transistors (TFTs) of amorphous or polycrystalline silicon sandwiched between two glass plates. The TFTs supply voltage to liquid-crystal-filled cells, or pixels, between the sheets of glass. When hit with an electric charge, the liquid crystals untwist to an exact degree to filter white light generated by a lamp. This filtered light shines directly on the viewing screen or, in the case of projection televisions, is projected through a small chip that acts as a lens. LCDs that are capable of producing color images, such as in televisions and computers, reproduce colors through a process of subtraction, blocking out particular color wavelengths from the spectrum of white light until only the desired color remains. It is the variation of the intensity of light permitted to pass through the matrix of liquid crystals that enables LCD displays to present images full of gradations of different colors.
The nature and functioning of LCD displays present many advantages relative to other display technologies. The amount of power required to untwist the crystals to display images, even dark ones, is much lower than that required for analogous processes using other technologies, such as plasma. The dense array of crystals displays images from computer or other video graphics sources extremely well, with full color detail, no flicker, and no screen burn-in. Moreover, the number of pixels per square inch on an LCD display is typically higher than that for other display technologies, so LCD monitors are particularly good at displaying large amounts of data with exceptional clarity and precision. As a result, LCD TVs are considered the best display platform for video games, high definition television, movie special effects, and other graphics-intensive uses.


The process through which an LCD monitor displays different colors is most closely analogous to


(A) an hourglass partially blocked such that a limited stream of grains of sand fall into the lower portion

(B) a series of filters that separate all of the components of a mixture according to size

(C) a recording studio soundproofed so that any performances within are muted to those outside

(D) a piece of construction paper with outlines of characters cut out such that a lamp in front of the paper casts shadows in the shapes of the characters

(E) an air vent that emits warmer air outside of a building while an air conditioning system cools the interior of the building
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Re: LCDs [#permalink] New post 08 Dec 2009, 08:20
B seems to be the best answer.

a series of filters that separate all of the components of a mixture according to size.

This is the part of the paragraph that points to the answer choice B

filtered light shines directly on the viewing screen or, in the case of projection televisions, is projected through a small chip that acts as a lens. LCDs that are capable of producing color images, such as in televisions and
computers, reproduce colors through a process of subtraction, blocking out particular color wavelengths

What is the oA??
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Re: LCDs [#permalink] New post 08 Dec 2009, 08:27
IMO (D) - It's about blocking light according to some predesigned pattern
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Re: LCDs [#permalink] New post 12 Dec 2009, 06:53
I agree with D.

I do not think that B is the answer because by that logic, then the LCD filters light into groups of light based on color. That is not exactly what it is doing.

What it does is much more similary to filtering it to expose the desired color like the paper cut out.

What is the OA?
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Re: LCDs [#permalink] New post 14 Dec 2009, 08:29
This was a passage from Manhattan GMAT. I can post the Official explanation if ayneone would like?
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Re: In the past decade, rapid technological progress and a [#permalink] New post 16 Sep 2014, 22:22
D cannot be the answer because either it lets out complete light or no light. Analogous will be if it filters some components (wavelengths) of light and lets other out. B goes well with it. Since it draws a parallel between wavelengths of light and size of the components.
Re: In the past decade, rapid technological progress and a   [#permalink] 16 Sep 2014, 22:22
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