Comparative Analysis Of Computer Display Systems

Word Count: 1902 |

When shopping for a new computer system, consumers tend to agonize over the CPU speed, hard disk size, or memory, but what about the one component of a computer that is equally utilized? The monitor often referred to as a display screen. The monitor is the component of a computer system that displays the messages and data being processed by the computer’s central processor unit. Two of the most common types of monitors are the CRT (Cathode Ray Tube) monitors and LCD (Liquid Crystal Display) monitors. Despite significant differences between LCD and CRT technologies, both types are equally marketable. CRTs are bigger and bulkier than LCDs, consume more power and are prone to screen flicker. LCD monitors, however, are more expensive in relation to CRTs, they introduce the problem of viewing angles, and generally have less accurate color replication.
Each type of monitor has its advantages and disadvantage, the following analysis will provide a comparison of CRT and LCD monitors, along with defining some of the many specifications and terminologies consumers should be aware of when purchasing a computer display system.
1.0 CRT or LCD
Deciding whether to choose LCD or CRT is a difficult question as there are several criterions involved. Depending on the importance of each of the qualifications to the application, final decision will favor either the LCD or CRT.
· Image quality
· Total cost of ownership
· Space consideration
· Available budget
1.1 Image Quality
Which technology offers the best image quality is a complex question. While LCDs presents crisp images, CRTs have superior color clarity, sharp pictures, and fluid video playback capabilities. Unlike LCDs, CRTs display more colors and use emissive technology (meaning that they generate their own light) and, as a result, can be viewed from practically any angle. When you look at an LCD monitor from an angle, the image can look dimmer or even disappear. Colors can also be misrepresented. To compensate for this problem, LCD monitor makers have designed wider viewing angles. (Often confuse with a widescreen display, which means the display is physically wider.) Manufacturers give a measure of viewing angle in degrees (the greater the number of degrees, the better the LCD screen.) In general, look for between 120 and 170 degrees. Because manufacturers measure viewing angles differently, the best way to evaluate it is to test the display in person. Check the angle from the top and bottom as well as the sides, bearing in mind the typical use of the display. (PC World magazine, August 2006)

Table 1 summarizes important image quality differences between the two technologies.

LCD CRT
Perfect Geometry Geometric Correction needed
Pixelization due to black lines between pixels Continuous image
Uniform sharpness Less Uniform Sharpness
600:1 contrast ratio (Dark Reading Room) 3000:1 Contrast Ratio (Dark Reading Room)
Contrast Ratio dependent on viewing angle Contrast Ratio independent from viewing angle
LCDs like white CRTs like black
Imperfect Black Perfect Black is possible
Low reflection of Ambient light High reflection of ambient light
Poor Stability (Good with I-Guard) Good Stability
Poor Response Speed Instantaneous response speed
Image Retention No Image Retention
Backlight Aging Phosphor aging
Aging independent of image content Aging is image content dependent
New Technology Mature Technology
Low Power Consumption High Power consumption
No Image Flicker Image Flicker Present

Table 1 Significant Differences Between LCD and CRT Technologies
Source: American Association of Physicists. (2004)
“Assessment of Display Performance”

1.2 Total Cost of Ownership
As the initial investment in flat panel technology is still higher than CRT, one has to look at other factors to verify whether the cost remains in favor for the CRT. The basic reason for price difference is that CRT monitors have developed over the last twenty years with computers and the manufacturers of the CRT monitors have already covered their development and production set up costs. The cost of both technologies has decreased over the past few years, and LCDs are reaching a point where smaller monitors are within many consumers’ price range.
Another financial factor is the power consumption of LCDs, which is about half that of an equivalent CRT display. CRTs consume a lot of power and thus generate a lot of heat. Over the lifetime of an LCD display this will result in energy savings, and lower air-conditioning costs. (Poor, 2002)
There is a general consensus that LCD technology is less critical to failures than the high end CRT technology. The main reasons for this are:
· Lower voltage use
· Lower power consumption
These will result in lower maintenance cost for the displays. LCD backlights can be replaced when the lamps are exhausted. The cost for this is lower than the replacement of a CRT picture tube.
1.3 Space Considerations
It is clear that if space is an issue (which is often the case), LCD technology offers a clear advantage over the bulky and heavy CRT technology. CRTs cubic shaped screen are three times bigger than the same screen size flat screen and generates a waist of work space. For an optimum vision comfort, the distance between the user and the screen must be: 1.5 x the exact screen size diagonal (Kelly, 2005, p. 95). For instance, to properly view a 17” monitor, the right distance should be: 17 x 1.5 = 25.5 in. (Figure 1)

Figure 1 Optimum Vision Comfort Zone
Source: Kyrnin. (2007) “CRT vs. LCD Monitors”

An LCD monitor is significantly thinner and lighter than a CRT monitor, typically weighing less than half as much. Unlike CRT monitors, LCD monitors have much more flexibility for positioning the screen in any way. LCD monitors can swivel, tilt up and down, and even rotate from landscape (with the horizontal plane longer than the vertical plane) to portrait mode (with the vertical plane longer than the horizontal plane). In addition, because they are lightweight and thin, most LCD monitors have built-in brackets for wall or arm mounting.
1.4 Budget
At this moment LCD technology still comes at a premium price compared to CRT. The initial investment will be higher than using CRT technology. However, it possible to reduce the investment considerably by choosing the right display for the right application. The lower resolution models are substantially less expensive than the high-end models. As the technology matures, further price reductions will make LCD technology even more competitive and perhaps replace the CRT technology.
Budgeting for either type of monitors relies on the intended purpose of the display system. CRT monitors are better suited for consumers who will use the system for desktop publishing, graphics development, and gaming without the need for portability, or those who are on a limited budget. Others who use the computer for word processing, programming or limited desk space should select the LCD monitors.
2.0 Display parameters
We can characterize the displays that are available on the market in a number of categories. Separate categories can be distinguished based on resolution, brightness, uniformity, color, and calibration possibilities.
2.1 Resolution
Resolution on a CRT is flexible and a newer model will provide viewing resolutions of up to 1600 by 1200 and higher, whereas on an LCD the resolution is fixed within each monitor (called a native resolution). The resolution on an LCD can be changed, but if you’re running it at a resolution other than its native resolution you will notice a drop in performance or quality.
Dot pitch refers to the space between the pixels that make up the images on your screen, and is measured in millimeters. The less space between pixels, the better the image quality. (Figure 2)

Figure 2 Magnified view of dot pitch on a CRT monitor
Source: Kyrnin. (2007) “CRT vs. LCD Monitors”
On either type of monitor, smaller dot pitch is better and you’re going to want to look at something in the 0.26 mm dot pitch or smaller range.
Both types of monitors (newer models) provide bright and vibrant color display. However, LCDs cannot display the maximum color range that a CRT can. In terms of image sharpness, when an LCD is running at its native resolution the picture quality is perfectly sharp. On a CRT the sharpness of the picture can be blemished by soft edges or a flawed focus.
2.2 Refresh Rate
In monitors based on CRT technology, the refresh rate is the number of times that the image on the display is drawn each second. If your CRT monitor has a refresh rate of 72 Hertz (Hz), then it cycles through all the pixels from top to bottom 72 times a second. Refresh rates are important because they control flicker, and the faster the refresh rate the better the monitor. Too few cycles per second and you will notice a flickering, which can lead to headaches and eye strain. LCDs are flicker-free and as such the refresh rate isn’t an important issue with LCDs.

2.3 Brightness
Typically, brightness is not a concern with CRT monitors. LCD monitors are backlit and have different levels of brightness. The brightness rating for an LCD monitor is commonly referred to as ‘nits’, and commonly range from 70 to 250 nits. The higher the nits, the brighter the display. LCD monitors offer almost twice the brightness compared to the CRT monitor. If placement of the display system is in a brightly lit room or with plenty of sunshine coming through the window, LCD is the best choice.
2.4 Color
Most CRT monitors are capable of displaying unlimited colors. Some LCD monitors are only capable of hundreds or thousands of colors, but many of the newer LCD’s are closing the gap rapidly.
3.0 Summary of Comparison
A monitor is an absolutely essential part of any computer system, selecting a monitor with the size, image quality, and energy efficiency to suit a consumer’s needs is equally important. The falling prices of conventional CRTs are making larger monitors more attractive and affordable. Now the market offers more choice than ever with the emergence of sleek, compact LCDs.
4.0 Recommendations
The choice between CRT and LCD technology depends heavily on the application.
CRT display systems are suitable for:
1. Publishers
2. Graphic developers
3. Serious video gamers
LED display systems are suitable for:
1. Computer programmers
2. Office clerks
3. Writers

Works Cited
Assessment of Display Performance. (2005). American Association of Physicists.

How Stuff Works, Inc. (1998-2007). CRT and LCD Computer Monitors. Available WWW:
http://www.howstuffworks.com/

Kelly, S. M. (2000). Flat Panel Displays, Advanced Organic Materials. Cambridge, UK: The
Royal Society of Chemistry.

Kyrnin,Mark. (2006, December). CRT vs. LCD Monitors: Which Type of Monitor is the Best to
Buy? Available WWW:http://compreviews.about.com/library/weekly/aa-crtvlcd.htm.

Liquid Crystal Display (2006, August). Light, Slight, and Stylish- LCD Monitors. PC World,
32-48.

Poor, Alfred. (2002, November). Displaying the Future. PC Magazine,16-27

You May Also Find These Documents Helpful

Allegory Of American Pie By Don Mc Lean

Ask anyone what was the defining moment in the rock history of the 1960s was and all you will get is a one word answer: Woodstock. The three day rock festival that defined an era was only one of many music festivals of the '60s. But Woodstock has come to symbolize, "an era of peaceful, free- loving, drug- taking hippie youth, carefree before harsher realities hit..." (Layman 40). The Woodstock festival ended a century filled with many metamorphoses of rock'n'roll, from the era of pop music to the rebirth of folk music to the invention of acid rock. But some cynics say that rock'n'roll died with the death of Buddy Holly before the 60s even began. One such person is Don McLean. The poet behind the haunting epic song about the death of 'danceable' music, McLean wrote the ever popular song, "American Pie" (appendix 1). The most important song in rock'n'roll history, "American Pie", is the song about the demise of rock'n'roll after Buddy Holly's death and the heathenism of rock that resulted. Although McLean himself won't reveal any symbolism in his songs, "American Pie" is one of the most analyzed pieces of literature in modern society. Although not all of its secrets have been revealed, many "scholars" of the sixties will agree that the mystery of this song is one of the reasons it has become so successful- everyone wants to know the meanings of its allegories. Proof of "American Pie's" truth lies in the allegory of the song. Many People enjoy the song but have no idea what it means- Who is the Jester? What is the levee? When the deeper story is found, the importance of the song is unearthed. "American Pie" is not only a song, it is an epic poem about the course of rock'n'roll...

Carl Orffs Philosophies In Music Education

While Carl Orff is a very seminal composer of the 20th century, his greatest success and influence has been in the field of Music Education. Born on July 10th in Munich, Germany in 1895, Orff refused to speak about his past almost as if he were ashamed of it. What we do know, however, is that Orff came from a Bavarian family who was very active in the German military. His father's regiment band would often play through some of the young Orff's first attempts at composing. Although Orff was adamant about the secrecy of his past, Moser's Musik Lexicon says that he studied in the Munich Academy of Music until 1914. Orff then served in the military in the first world war. After the war, he held various positions in the Mannheim and Darmstadt opera houses then returned home to Munich to further study music. In 1925, and for the rest of his life, Orff was the head of a department and co-founder of the Guenther School for gymnastics, music, and dance in Munich where he worked with musical beginners. This is where he developed his Music Education theories. In 1937, Orff's Carmina Burana premiered in Frankfurt, Germany. Needless to say, it was a great success. With the success of Carmina Burana, Orff orphaned all of his previous works except for Catulli Carmina and the En trata which were rewritten to be acceptable by Orff. One of Orff's most admired composers was Monteverdi. In fact, much of Orff's work was based on ancient material. Orff said: I am often asked why I nearly always select old material, fairy tales and legends for my stage works. I do not look upon them as old, but rather as valid material. The time element disappears, and only the spiritual power remains. My...

Johann Sebastian Bach Biography

Throughout the history of music, many great composers, theorists, and instrumentalists have left indelible marks and influences that people today look back on to admire and aspire to. No exception to this idiom is Johann Sebastian Bach, whose impact on music was unforgettable to say the least. People today look back to his writings and works to both learn and admire. He truly can be considered a music history great. Bach, who came from a family of over 53 musicians, was nothing short of a virtuosic instrumentalist as well as a masterful composer. Born in Eisenach, Germany, on March 21, 1685, he was the son of a masterful violinist, Johann Ambrosius Bach, who taught his son the basic skills for string playing. Along with this string playing, Bach began to play the organ which is the instrument he would later on be noted for in history. His instruction on the organ came from the player at Eisenach's most important church. He instructed the young boy rather rigorously until his skills surpassed anyone?s expectations for someone of such a young age. Bach suffered early trauma when his parents died in 1695. He went to go live with his older brother, Johann Christoph, who also was a professional organist at Ohrdruf. He continued his younger brother's education on that instrument, as well as introducing him to the harpsichord. The rigorous training on these instruments combined with Bach?s masterful skill paid off for him at an early age. After several years of studying with his older brother, he received a scholarship to study in Luneberg, Germany, which is located on the northern tip of the country. As a result, he left his brother?s tutelage and went to go and study there. The teenage years brought Bach to several parts of Germany where he...

Michelangelo

Michelangelo was pessimistic in his poetry and an optimist in his artwork. Michelangelo?s artwork consisted of paintings and sculptures that showed humanity in it?s natural state. Michelangelo?s poetry was pessimistic in his response to Strazzi even though he was complementing him. Michelangelo?s sculpture brought out his optimism. Michelangelo was optimistic in completing The Tomb of Pope Julius II and persevered through it?s many revisions trying to complete his vision. Sculpture was Michelangelo?s main goal and the love of his life. Since his art portrayed both optimism and pessimism, Michelangelo was in touch with his positive and negative sides, showing that he had a great and stable personality. Michelangelo?s artwork consisted of paintings and sculptures that showed humanity in it?s natural state. Michelangelo Buonarroti was called to Rome in 1505 by Pope Julius II to create for him a monumental tomb. We have no clear sense of what the tomb was to look like, since over the years it went through at least five conceptual revisions. The tomb was to have three levels; the bottom level was to have sculpted figures representing Victory and bond slaves. The second level was to have statues of Moses and Saint Paul as well as symbolic figures of the active and contemplative life- representative of the human striving for, and reception of, knowledge. The third level, it is assumed, was to have an effigy of the deceased pope. The tomb of Pope Julius II was never finished. What was finished of the tomb represents a twenty-year span of frustrating delays and revised schemes. Michelangelo had hardly begun work on the pope?s tomb when Julius commanded him to fresco the ceiling of the Sistine Chapel to complete the work done in the previous century under Sixtus IV. The overall organization consists of four large triangles at...

Oscar Wilde

Oscar Fingal O'Flahertie Wills Wilde was born in Dublin Ireland on October 16, 1854. He is one of the most talented and most controversial writers of his time. He was well known for his wit, flamboyance, and creative genius and with his little dramatic training showing his natural talent for stage and theatre. He is termed a martyr by some and may be the first true self-publicist and was known for his style of dress and odd behavior. Wilde, 1882 His Father, William Wilde, was a highly accredited doctor and his mother, Jane Francesca Elgee, was a writer of revolutionary poems. Oscar had a brother William Charles Kingsbury along with his father's three illegitimate children, Henry, Emily, and Mary. His sister, Isola Emily Francesca died in 1867 at only ten years of age from a sudden fever, greatly affecting Oscar and his family. He kept a lock of her hair in an envelope and later wrote the poem 'Requiescat' in her memory. Oscar and his brother William both attended the Protora Royal School at Enniskillen. He had little in common with the other children. He disliked games and took more interest in flowers and sunsets. He was extremely passionate about anything that had to do with ancient Greece and with Classics. Wilde during school years In 1871, he was awarded a Royal School Scholarship to Trinity College in Dublin and received many awards and earned the highest honor the college offered to an undergraduate, the Foundation Scholarship. In 1874, he also won the College's Berkley Gold Medal for Greek and was awarded a Demyship to Magdalen College, Oxford. After graduating from Oxford, Oscar moved to London with his friend Frank Miles, a well-known portrait painter of the time. In 1878 his poem Ravenna was published, for which he won the...

The History Of Greek Theater

Theater and drama in Ancient Greece took form in about 5th century BCE, with the Sopocles, the great writer of tragedy. In his plays and those of the same genre, heroes and the ideals of life were depicted and glorified. It was believed that man should live for honor and fame, his action was courageous and glorious and his life would climax in a great and noble death. Originally, the hero's recognition was created by selfish behaviors and little thought of service to others. As the Greeks grew toward city-states and colonization, it became the destiny and ambition of the hero to gain honor by serving his city. The second major characteristic of the early Greek world was the supernatural. The two worlds were not separate, as the gods lived in the same world as the men, and they interfered in the men's lives as they chose to. It was the gods who sent suffering and evil to men. In the plays of Sophocles, the gods brought about the hero's downfall because of a tragic flaw in the character of the hero. In Greek tragedy, suffering brought knowledge of worldly matters and of the individual. Aristotle attempted to explain how an audience could observe tragic events and still have a pleasurable experience. Aristotle, by searching the works of writers of Greek tragedy, Aeschulus, Euripides and Sophocles (whose Oedipus Rex he considered the finest of all Greek tragedies), arrived at his definition of tragedy. This explanation has a profound influence for more than twenty centuries on those writing tragedies, most significantly Shakespeare. Aristotle's analysis of tragedy began with a description of the effect such a work had on the audience as a "catharsis" or purging of the emotions. He decided that catharsis was the purging of two specific emotions, pity and...

Scholarship Essay About Goals

Ever since I was a young kid I have always been interested with aircraft. I was so curious of how airplane's fly. I remember taking my toys apart to see how it works. As a kid I wanted to go to the airport to watch the airplanes land and fly and pondered how this happens. Other kids wanted to go to the amusement places. As I grew older I became more and more interested in aircraft and the technology behind it. I always involved myself with aviation early on. I read books and magazines on aviation, took museum tours, built model airplanes. When I was younger my father would take me to aircraft repair facilities where I would watch in great fascination. In my teens, went up to the military bases and befriended many soldiers involved with aircraft and asked them numerous questions. I got to meet many aeronautics engineers and borrowed their old textbooks and read them till the wee hours of the morning. As technology improved with information superhighway, I logged on the web. Stayed up for hours and hours searching through web pages and web pages of information about aircraft and technology. I started my elementary school in the Philippines, then we moved to U.S. and continued my high school education and graduated. Enrolled at the CCSF to pursue my college education and now I am in the 2nd year in CCSF taking aeronautics. My goal now is to obtain my AS degree from the City College of San Francisco (CCSF) so I can transfer to a University and get a Bachelors degree and to continue for my Masters degree in Aeronautics Engineering. I will strive hard to reach the peak level of my career which is a Professor and hopefully to be an aeronautic professor so...

Circus Circus Enterprises Case Studies

Executive Summary: Circus Circus Enterprises is a leader and will continue to be in the gaming industry. In recent years, they have seen a decline in profit and revenue; management tends to blame the decrease on continuing disruptions from remodeling, expansion, and increased competition. Consequently, Circus has reported decreases in its net income for 1997 and 1998 and management believes this trend will continue as competition heightens. Currently the company is involved in several joint ventures, its brand of casino entertainment has traditionally catered to the low rollers and family vacationers through its theme park. Circus should continue to expand its existing operations into new market segments. This shift will allow them to attract the up scale gambler. Overview Circus Circus Enterprises, Inc founded in 1974 is in the business of entertainment, with its core strength in casino gambling. The company?s asset base, operating cash flow, profit margin, multiple markets and customers, rank it as one of the gaming industry leaders. Partners William G. Bennett an aggressive cost cutter and William N. Pennington purchased Circus Circus in 1974 as a small and unprofitable casino. It went public in 1983, from 1993 to 1997; the average return on capital invested was 16.5%. Circus Circus operates several properties in Las Vegas, Reno, Laughlin, and one in Mississippi, as well as 50% ownership in three other casinos and a theme park. On January 31,1998 Circus reported net income of 89.9 million and revenues of 1.35 billion, this is a down from 100 million on 1.3 billion in 1997. Management sees this decline in revenue due to the rapid and extensive expansion and the increased competition that Circus is facing. Well established in the casino gaming industry the corporation has its focus in the entertainment business and has particularly a popular theme resort concept....

Effect Of Civil War On American Economy

The Economies of the North and South, 1861-1865 In 1861, a great war in American history began. It was a civil war between the north and south that was by no means civil. This war would have great repercussions upon the economy of this country and the states within it. The American Civil War began with secession, creating a divided union of sorts, and sparked an incredibly cataclysmic four years. Although the actual war began with secession, this was not the only driving force. The economy of the Southern states, the Confederacy, greatly if not entirely depended on the institution of slavery. The Confederacy was heavily reliant on agriculture, and they used the profits made from the sale of such raw materials to purchase finished goods to use and enjoy. Their major export was cotton, which thrived on the warm river deltas and could easily be shipped to major ocean ports from towns on the Mississippi and numerous river cities. Slavery was a key part of this, as slaves were the ones who harvested and planted the cotton. Being such an enormous unpaid work force, the profits made were extraordinarily high and the price for the unfinished goods drastically low in comparison; especially since he invention of the cotton gin in 1793 which made the work all that much easier and quicker. In contrast, the economical structure of the Northern states, the Union, was vastly dependent on industry. Slavery did not exist in most of the Union, as there was no demand for it due to the type of industrial development taking place. As the Union had a paid work force, the profits made were lower and the cost of the finished manufactured item higher. In turn, the Union used the profits and purchased raw materials to use. This cycle...

Evaluation Of The Effectiveness Of Trade Embargoes

Although I am a strong critic of the use and effectiveness of economic sanctions, such as trade embargoes, for the sake of this assignment, I will present both their theoretical advantages and their disadvantages based upon my research. Trade embargoes and blockades have traditionally been used to entice nations to alter their behavior or to punish them for certain behavior. The intentions behind these policies are generally noble, at least on the surface. However, these policies can have side effects. For example, FDR's blockade of raw materials against the Japanese in Manchuria in the 1930s arguably led to the bombing of Pearl Harbor, which resulted in U.S. involvement in World War II. The decades-long embargo against Cuba not only did not lead to the topple of the communist regime there, but may have strengthened Castro's hold on the island and has created animosity toward the United States in Latin America and much suffering by the people of Cuba. Various studies have concluded that embargoes and other economic sanctions generally have not been effective from a utilitarian or policy perspective, yet these policies continue. Evaluation of the effectiveness of Trade Embargoes Strengths Trade embargoes and other sanctions can give the sender government the appearance of taking strong measures in response to a given situation without resorting to violence. Sanctions can be imposed in conjunction with other measures to achieve conflict prevention and mitigation goals. Sanctions may be ineffective: goals may be too elusive, the means too gentle, or cooperation from other countries insufficient. It is usually difficult to determine whether embargoes were an effective deterrent against future misdeeds: embargoes may contribute to a successful outcome, but can rarely achieve ambitious objectives alone. Some regimes are highly resistant to external pressures to reform. At the same time, trade sanctions may narrow the...