|
|
This is only a preview of the paper
Click here to register and get the full text.
Existing members click here to login
|
|
|
VGA Display Analysis:
A closer look Into Cathode Ray Tube Displays and Flat Panel Display Technologies
NAME
CLASS
DATE
TABLE OF CONTENTS
ABSTRACT 1
ADDITIVE PRIMARY COLOR 4
CRT VGA DISPLAY: HOW DO THEY DO THAT? 6
LCD FLAT PANEL DISPLAYS: HOW DO THEY DO THAT? 9
CRT DISPLAYS VS. FLD FLAT PANELS 10
BRIGHTNESS 11
CONTRAST 11
USABILITY IN BRIGHT ENVIRONMENTS 12
SIZE AND WEIGHT 12
POWER CONSUMPTION 12
COST 12
FIXED RESOLUTION 13
BACKLIGHT FAILURE 13
POOR DISPLAY OF FAST MOTION VIDEO 13
LIMITED VIEWING ANGLE 14
COLOR SHIFTING 14
PIXEL DEFECTS 14
IMAGE PERSISTENCE 14
FLAT COLOR RENDERING 15
DIGITAL LIGHT PROCESSING 16
BIBLIOGRAPHY 18
Abstract
What’s on your desk? A few years ago, perhaps as recent as six months ago, most offices and dorm desks equipped with a computer had at least a 15” CRT VGA display taking up the vital space on their desks. With the more recent popularity and dropping costs for the flat panel displays, these once-crowded desks are taking back their space, some taking back all of the once occupied space from the bulky CRT by simply having the lighter flat panel display mounted directly to the wall itself.
Through this research report we will investigate the two most popular desktop video displays for business and home PCs; the CRT (Cathode Ray Tube) VGA Display, and the ever growing in popularity, FPD (Flat-Panel Display). We then will perform a comparative analysis of the two and how each technology individually functions to produce the color and motion images for the viewer to interact with.
At this time, to reduce any tunnel vision a reader may have about display technologies, It is worthy to note that a newer emerging technology, Digital Light Processing (DLP) has been receiving many reviews and compliments in the technology news as it boasts it is one of the most complex light switch developed with over 1 million miniature reflecting mirrors on the surface of a semi-conductor more formally known as a Digital Micromirror Device (DMD). Although my research branched into DLP technology for the sake of curiosity, this topic is left untouched in this document as this technology has enough content to be self contained in a separate, unadulterated report. Let us also make a mental note that the DLP is still in the beginning stages for marketability while the flat-panel displays are now crossing the threshold to become the industry standard. ... )
Additive Primary Color
Before we can delve into the understanding of VGA displays, even still before we can begin a discussion of the digital light processing, we need to first understand the basics of displaying information unto the VGA display. ... That is, let us look at the color red, green, and blue, examining their wavelengths in full scaled visual-range spectra. ... Let us look at the sum of the wavelengths impacting the screen. ...
The simple understanding that the eye is the catalyst for adding the spectra is also exploited throughout most display methods as well look into more specifically.
The art form of pointillism also exploited this ‘trickery’ of the eye, by painting thousands of tiny dots close together so they blend into a variety of subtle colors when viewed at a distance [Overheim]. The array of colors being emitted by a television tube is produced essentially in the same way [Overheim, Hamblen].
Now let us place this mutual understanding in terms for computer displays. ... ”
BMPs are used to easily display static images, but what about movie pictures, digital video, fast motion pictures, that is, the ability to frequently turn on and off the pixels of the screen [Hamblen]. ... Keeping this topic in mind, we will look further now into how the CRT display, the liquid-crystal display and digital light processing techniques work. ...
CRT VGA Display: How do they do that? ... com]
Based originally on the old television deigns that your grandpa would talk to you about with the many vacuum tubes and immense heat originating from them; we start here to examine the CRT display, one of the most commonly used, and reliable display screens on the market for the last twenty years.
First thing to occur for all display systems would be to acquire the digital signals from the operating environment or application software that are sent to the super video graphics array (SVGA) adapter [White]. ... Normal VGA adapters, the table contains values for approximately 200 thousand possible colors, of which 256 values can be stored in the VGA’s memory at one time [White]. With newer technologies, faster and larger memory devices at lower costs, more modern off the shelf super VGA adapters have enough memory to store 16-Bits of information for each pixel (that is 65, 536 variations of color - called high color) or 24-Bits a pixel for 17,777,216 shades which is coined, “true color” and even still one could purchase 32-Bit and even 64-Bit versions for as little as $150 US a card to as high as $950 per adapter card. These prices can be just as high, if not higher, than the actual cost of the display device in which they’re sending the signals to.
The signals arrive to the back of the VGA monitor to the three electron guns at the end of the cathode ray tube. ... This device is very important in the CRT Display design as it aims the electron beams to the screen. ... The closer the holes, the smaller the dot pitch.
Approximate Word count = 4556
Approximate Pages = 18.2
(250 words per page double spaced)
|
|
|
|
|
|