Wi Fi

1. Wi Fi

Wi-Fi is a means of connecting wireless devices to each other in order to exchange data. Wi-Fi is actually a brand name for a set of security and hardware function protocols which aim to help ensure that a Wi-Fi connection is secure and easy to configure. Establishing these approved protocols creates a Wi-Fi certified network, which can help connect your business data and ensure a secure connection for your customers and employees.

Basics

Wi-Fi is short for wireless fidelity. Wi-Fi is a common term used by businesses to advertise that they have wireless Internet. You may not know that Wi-Fi is actually a brand held by the Wi-Fi alliance. Use of the Wi-Fi brand means that your products and their configurations follow hardware and security requirements.

  Wi-Fi Certified

 If your wireless hardware and configurations meet the requirements set forth by the Wi-Fi Alliance, your connection is Wi-Fi Certified. Wi-Fi certified products are products which have been tested for reliability by the Wi-Fi Alliance. The Wi-Fi alliance tests four different categories of Wi-Fi to ensure that they meet Wi-Fi certified brand standards. The four types of Wi-Fi are 802.11a, 802.11b, 802.11g, and 802.11n. Each category is tested for adherence to performance standards before it is given Wi-Fi certified status.

 Hotspots

Wireless Internet hotspots are located in many places, but not all wireless hotspots are Wi-Fi certified. You can locate Wi-Fi certified hotspots using the ZONE finder on the Wi-Fi Alliance's website. By using Wi-Fi certified hotspots, you can be sure that the hardware that accesses the Internet has been tested by an independent lab verifying that it meets security standards. These standards can help you ensure that you are accessing a secure wireless network.

Testing

The Wi-Fi Alliance performs a series of tests on wireless Internet hardware to make sure they meet the quality standards that were established by the organization. In addition to hardware integrity tests, the security of the wireless hardware is tested by Wi-Fi to make sure it meets a set of standards called the "Wi-Fi Protected Setup." Products which pass the test should should be easy to configure and secure for the average consumer. The test used to be called the "Wi-Fi Simple Config."

 Function

 Wi-Fi certification can offer many benefits to private individuals and businesses small and large. Wi-Fi certification offers a more secure and easier to configure way of connecting your wireless devices. Wi-Fi is most functional in corporate applications, especially situations in which sensitive data needs to be protected by adequate security measures. Small businesses can benefit from Wi-Fi because it allows them to collect their data and connect employees for easier access and communication.

2. TFT LCD

Many modern television and computer displays use TFT LCD technology, but this type of display remains somewhat mysterious to some users. By manipulating a semisolid material with electricity, TFT LCD devices can accurately reproduce visual images.

Definition

The term TFT LCD is a shorthand expression for thin film transistor liquid crystal display technology. These displays use electrical stimulation of liquid crystals to produce a visual image.

Structure

Plasma.com describes a TFT LCD as a collection of liquid crystals sandwiched between two glass plates. The LCD display manufacturer Samsung notes that the displays also include a circuit unit, a backlight and a chassis for support.

Function

According to Samsung, electricity stimulates liquid crystals in a TFT LCD display. The stimulated liquid crystals change their structure and alignment depending on the applied voltage, and these changes appear as different colors. A TFT LCD groups thousands of liquid crystals together, aligning thousands of individual picture elements, or pixels, to produce visual images.

3. Projector

A projector is a device that uses light and lenses to take an image and project a magnified image onto a larger screen or wall. Projectors can magnify still or moving images depending on how they are built. The image must be shone through a sealed tube or frame when passing through the lenses to maintain focus.

Effects

The projector sends the lighted image through at least two lenses (concave and convex) to focus the image and then magnify it out to the screen. Because it is several lenses fused into one, a fresnel lens can sometimes work by itself (though the image can be inverted).

Types

Overhead and slide projectors are among the projectors that shine light through a still image and uses its lenses to project a larger image onto the screen. A film or video projector sends moving pictures across the light beam to play a movie in the same way.

Features

 The one, and most important, feature shared by almost all projectors is the ability to adjust the lenses and focus the projected image to get a clear picture (depending on the projector's proximity to the screen).

Function

Most projectors use a straight tube or frame that sends the image in one direction. An overhead projector, however, first shines the image upward and then bounces it off a mirror to send it in a forward direction.

Benefits

Still and video projectors are used by both business and educational institutions to showcase important presentations and videos. Movie theaters to this day use projectors to show films on a large screen.

Fun Fact

Any device with a video screen, like a TV or media player, can be turned into a projector by constructing a tube-like frame around the screen and inserting lenses into the frame.