20-10-2012, 12:50 PM
LCD Monitors
[attachment=36816]
Monitor Overview
The most-used output device on a computer.
Most desktop displays use a cathode ray tube (CRT).
Laptops use liquid crystal display (LCD), light-emitting diode (LED), and gas plasma or other image projection technology.
Monitors using LCD technologies are beginning to replace CRT.
LCD History
Liquid crystals were first discovered in 1888 by Austrian botanist Friedrich Reinitzer.
Melt cholesterol-like substance.
When cooled, the liquid turned blue before finally crystallizing.
RCA made the first experimental LCD in (1968).
Manufacturers have been developing creative variations and improvements since on LCDs.
What is Being Used Today?
The most popular display today remains CRT.
It has been available for more than 70 years.
CRTs:
Vivid colors and detailed images and text.
Cost less than LCD monitors.
Continue to evolve.
LCD Market Trend
Market for flat screen LCDs grew rapidly during the ‘90s.
Huge success of the laptop computer.
It has still been slow in matching the market share of the CRT.
Color LCDs hit the market in the early ‘90s.
Has only now become popular enough for vendors to mass-produce.
From CRT to LCD
CRT
Bulky, heavy, use vacuum tube technology.
Using technology that was developed in the 19th century.
LCD
First LCD laptop monitors were very small due to manufacturing costs.
Light, sleek, energy-efficient, have sharp picture.
How Monitors Work
Most use a cathode-ray tube as a display device.
CRT: Glass tube that is narrow at one end and opens to a flat screen at the other end.
Narrow end contains electron guns.
Single gun for monochrome and three guns for color.
Display screen is covered with tiny phosphor dots that emit light when struck by the electron gun.
Monitor Classifications
Monochrome: Display two colors, one for the background and one for the foreground.
Gray-Scale: A special type of monochrome monitor capable of displaying different shades of gray.
Color: Can display anywhere from 16 to over 1 million different colors. Sometimes called RGB monitors.
LCD Technology
Used for displays in notebooks, small computers, pagers, phones and other instruments.
Uses a combination of fluorescent-based backlight, color filters, transistors, and liquid crystal to create and illuminate images.
Until recently, was only used on notebook computers and other portable devices.
In 1997, manufactures began to offer full size LCD monitors as alternatives to CRT monitors.
Advantages of LCDs
Display Size
Available at comparable in screen size as traditional CRT
Shown on the next slide, a 12.1" LCD display (left) has only a slightly smaller viewing area than a typical 14" CRT monitor. Newer, larger LCD monitors are also appearing that have 15", 17", and even larger screen sizes that are comparable to the largest CRT monitors. (One thing to note is that LCD monitors are typically sized by their actual viewable diagonal measurement, but CRTs typically are not.)
Disadvantages of LCDs
Resolution
Displays Native Resolutions (Resolution that it displays best)
Viewing Angle
Smaller, needed to be viewed more directly from the front.
From the side the images on an LCD screen can seem to disappear, or invert colors.
Newer displays that are coming out have a wider viewing angle so this is not as much of an issue as it has been in the past.
[attachment=36816]
Monitor Overview
The most-used output device on a computer.
Most desktop displays use a cathode ray tube (CRT).
Laptops use liquid crystal display (LCD), light-emitting diode (LED), and gas plasma or other image projection technology.
Monitors using LCD technologies are beginning to replace CRT.
LCD History
Liquid crystals were first discovered in 1888 by Austrian botanist Friedrich Reinitzer.
Melt cholesterol-like substance.
When cooled, the liquid turned blue before finally crystallizing.
RCA made the first experimental LCD in (1968).
Manufacturers have been developing creative variations and improvements since on LCDs.
What is Being Used Today?
The most popular display today remains CRT.
It has been available for more than 70 years.
CRTs:
Vivid colors and detailed images and text.
Cost less than LCD monitors.
Continue to evolve.
LCD Market Trend
Market for flat screen LCDs grew rapidly during the ‘90s.
Huge success of the laptop computer.
It has still been slow in matching the market share of the CRT.
Color LCDs hit the market in the early ‘90s.
Has only now become popular enough for vendors to mass-produce.
From CRT to LCD
CRT
Bulky, heavy, use vacuum tube technology.
Using technology that was developed in the 19th century.
LCD
First LCD laptop monitors were very small due to manufacturing costs.
Light, sleek, energy-efficient, have sharp picture.
How Monitors Work
Most use a cathode-ray tube as a display device.
CRT: Glass tube that is narrow at one end and opens to a flat screen at the other end.
Narrow end contains electron guns.
Single gun for monochrome and three guns for color.
Display screen is covered with tiny phosphor dots that emit light when struck by the electron gun.
Monitor Classifications
Monochrome: Display two colors, one for the background and one for the foreground.
Gray-Scale: A special type of monochrome monitor capable of displaying different shades of gray.
Color: Can display anywhere from 16 to over 1 million different colors. Sometimes called RGB monitors.
LCD Technology
Used for displays in notebooks, small computers, pagers, phones and other instruments.
Uses a combination of fluorescent-based backlight, color filters, transistors, and liquid crystal to create and illuminate images.
Until recently, was only used on notebook computers and other portable devices.
In 1997, manufactures began to offer full size LCD monitors as alternatives to CRT monitors.
Advantages of LCDs
Display Size
Available at comparable in screen size as traditional CRT
Shown on the next slide, a 12.1" LCD display (left) has only a slightly smaller viewing area than a typical 14" CRT monitor. Newer, larger LCD monitors are also appearing that have 15", 17", and even larger screen sizes that are comparable to the largest CRT monitors. (One thing to note is that LCD monitors are typically sized by their actual viewable diagonal measurement, but CRTs typically are not.)
Disadvantages of LCDs
Resolution
Displays Native Resolutions (Resolution that it displays best)
Viewing Angle
Smaller, needed to be viewed more directly from the front.
From the side the images on an LCD screen can seem to disappear, or invert colors.
Newer displays that are coming out have a wider viewing angle so this is not as much of an issue as it has been in the past.