What Are Fax Machines And Their History?

What Are Fax Machines And Their History?

  January 23, 2018

The printed copy is calls hard copy Fax is short form of facsimile machine. It is a device used to send/receive ima i over a telephone line. It works by digitizing an image dividing it into a grid of dou. Each dot is either on or off, depending on whether it is black or white Electronically, each dot is represented by a bit that has a value either 0 (off or l (on). In this way, the fax machine translates an image into a series of zeros and ones (called a bit map) th t can be transmitted like normal computer data. On the receiving side, a fax machine reads the incoming data, translates the zeros and ones back into dots, and reprints the picture. The idea of fax machines has been around since 1842, when Alexander Bain invented a machine capable of receiving signals from a telegraph wire and translating them in images on paper. But fax machines revolution came in 1983 with adoption of standard protocol for sending faxes. Now, fax machines are common in offices of all sizes They provide an inexpensive, fast, and reliable method for transmitting certificates and handwritten notes etc. A fax machine consists of an optical scanner for digitizing images on paper, a printer for printing incoming fax messages, and a telephone for making the connection. Some printers on fax manchines are thermal, which means they require special kind of paper.

What is LED Display and its Advantages and Disadvantages

What is LED Display and its Advantages and Disadvantages

  December 27, 2017

What is LED Display and its Advantages and Disadvantages

LED stands for Light Emitting Diodes. LED display uses an array of light emitting diodes as a video display. An LED panel is a small display, or a component of a larger display. These are the most efficient way to turn an electric current into illumination. When a current flows through a diode in the forward direction, it consists of surplus electrons moving in one direction in the lattice and “holes” (voids in the lattice) moving In the other. Occasionally, electrons can recombine with holes. When they do, the process releases energy in the form of photons. This is true for all semiconductor junctions, but LEDs use materials that maximize the effect. The color of the light emitted (corresponding to the energy of the photon) is determined by the semiconductor materials. There are the energy of the LED panels: Conventional (using discrete LEDs) and Surface mounted device (SMD) panels.

Life span of LED is 10 times longer than that of LCD. These provide better picture quality, higher contrast ratio, consume less power, and are thin as compared to LCD monitors.

LED display is typically used as sign board in public transport. It is sometime also used as form of lighting for the purpose of stage lighting rather than display.

Advantages of LED Display:

1.      Slim Design: LED monitors backlighting allows for a slim, sleek design. These are much thinner and lighter than LCD monitors because LED monitors do not use fluorescent bulbs.

2.      Brighter Image: : LED monitors feature impressive contrast ratio that deliver a brighter picture than conventional LCD technology with brilliant image quality. Contrast is enhanced, colors are richer and black has more depth.

3.      Better Color: LED monitors feature more intensity graduation and a larger light wavelength that LCD monitors, delivering true, lifelike colors with better gradation.

4.      Flicker-Free Image: LED Monitors produce virtually flicker-free images, reducing eye strain, eye fatigue and headaches.

5.      Better Picture Quality: LED monitors have better color intensity and do not produce motion blur. With LED lighting technology, light does not escape as it does with LCD technology, so the quality of the images is not affected and the picture remains crisps and clear.

6.      Longer Lifespan: LCD monitors contains fluorescent blubs which have a relatively short lifespan with continuous use and can dim over time. LED monitors offers almost 10 times longerlife than LCD.

7.      Lower Power Consumption: LED monitors consume 30-50% less power than a conventional LCD monitors.

8.      No warm-up period: It does not require a warm up period and lights instantly in nanoseconds.

9.      Controllable: It can be controlled for brightness and color.

10.  Solid State: it is less to damage as it is solid state component.

11.  Environment Friendly: LED-lit display does not contain halogen or mercury (as in LCDs) that makes recycling them safer for the environment.

Limitation or Disadvantages of LED Display:

1.       Currently LEDs are more expensive.

2.      Its performance largly depends upon correct engineering.

3.      With passage of the and change in temperature its quality is affected.

What Is LCD Display and its Advantages or Disadvantages

What Is LCD Display and its Advantages or Disadvantages

  December 27, 2017

Hello guys, welcome

Today we’ll discuss about LCD (Liquid Crystal Diode) and I will tell you many Advantages or Disadvantages of LCD Screen.. Keep reading.

LCD Display Picture

LCD Display

LCD stands for Liquid Crystal Diode. LCD technology is used not only in computer screens but also in

televisions. It is a major improvement over the less efficient and bulky ray tube (CRT) screens.

It used a cold cathode and electricity to emit electrons that light up a fluorescent panel of crystals.

 The crystals twist and transform in shape in response to the electrons. The different shapes of the

 crystal determine amount of light show on your screen. The primary inefficiency in this technology is

that electricity is used even when showing black. The panel just blocks the light when black is needed

instead of shutting down the electricity.

Current version of LCD use active matrix technology and have faster refresh rates.

Advantages Of LCD Display:

1.      LCD provides sharp image.

2.      It provides zero geometric distortion at the native resolution of the panel.

3.      Its high peak intensity produce very bright image.

4.      Screens are perfectly flat and thin.

5.      Consume little electricity and produce little heat.

6.      It consumes less power as compare to CRT monitors.

Disadvantages Of LCD Display:

1.      Fluorescent light used in LCD have a relatively shorter life (approximately 10,000 hours). After three to five years, display becomes somewhat dimmer and the deteriorated lights can’t be easily replaced.

2.      LCD panel has a fixed built-in pixel resolution format. All other resolutions images require rescaling, which result in significant image degradation, particularly for fine text and graphics.

3.      It requires careful adjustment of pixel tracking/phase in order to reduce or eliminate digital noise in the image.

4.      It provides limited viewing angle.

5.      It is not suitable for use in dim light and dark environments.

6.      The bright-end of the LCD intensity scale is easily overloaded, which leads to saturation and compression.

7.      Slow response time and scan rate conversion.

8.      It is expensive more power as compare to LED monitors.

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