Category Archives: SCREEN TECHNOLOGY

Types of Screens

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When you go for buying a new television or monitor for a computer, you come across different types of screens. Some are wide; some are compact, some other with flat screen or of green color. The difference is because of the advancement in technology. Today, we have a lot of variety and we can go for the one which we like. A certain amount of knowledge is necessary for the selection of right screen. If you have some knowledge about these developments in screen technology, you can have better idea about different types of screens. There are different specifications attributed to each type of screen.

The major specification through which you can better judge the quality of screen is its black level. The higher level production of black color in screen shows that screen is of good quality. The screen with higher black level guarantees the sharp image.

Cathode Ray Tube screen is the first version of TV screen and still very popular because of its reliable features. This CTR screen is commonly has a curved display. This curved display facilitates the viewer to see the picture from any angle. These types of screens are available in limited sizes, bulky in mass but last longer. You can take view from any angle in the room. The drawback of this curved screen is the production of glare. When the light in the room is reflected from the screen it produces glare. It is very difficult to get clear image because of that glare. This glare compels you to close the eyes and you get irritated.

LCD, the most popular type of screen is comparatively expensive but black level is lower. The quality of picture is also depends upon black level. Although picture quality is not as sharp as of CRT yet are popular because of versatility. They are extremely slim in structure hardly 2” profile. As they are slim so very light weight and are easy to fix it wherever you like for example direct on the walls or ceiling. They have a limited life after which the display starts dim. It hardly remains in viewing condition around five years. LCD screens are not able to view from a certain distance. If not seeing from a particular angle, the image becomes dim. The image on the screen can blur due to the speedy movements of an object. The amount of energy consumes by the screen is much greater than CRT.

Plasma screen is becoming popular day-by-day. They are available in the large sizes. Like LCD, these screens are very large in sizes and due to light weight easily mounted on the walls.
On the other hand these screens are less in sized. Although they are very expensive yet not free from flaws. Lower black level becomes the reason for blur picture. They are expensive but give no guarantee of long life. They hardly work better not more than 2-3 years. One benefit of this plasma screen is this that it doesn’t produce glare and are better than CRTs.

Rear Projection screens are in developing stage. They are suggested for the dark rooms. They are quite heavy and are not supposed for the mounting. In case of disorder, it is very difficult to get fix. These types of display are not suggested for the mediocre. Still there are some drawbacks in the screen technology. But with the development and advancement in screen technology, this rear projection types are thought to be versatile. The glare would be controlled and the image produced by rear projection would be very sharp.

These were some of the types of screen described from many. Now you can see the difference yourself with naked eyes and decide which type of screen you need to buy, whether it’s better to go with the new trend or to choose the best for the long term use.

What is Touch Screen

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In the world of electronics, inventions are countless and awesome. The story of the screen starts from simple visual display and reaches the touch screen technology, the latest technology ever thought by human beings. The part of the screen’s story related to touch screen is quite interesting. Its electronic visual display responses when detect the touch at a certain place on the screen. This touch is generally a slight pressure of human hand or finger. Also this touch screen can sense an inactive thing. This inactive thing could be a stylus or nail, however, you cannot categorize the light pen with stylus being an active sensor.

One can recognize the touch screen with two very prominent features

  • When anyone touches the naked screen directly with the finger to the picture displays on it, will response to that touch. The need for an indirect system for example with mouse to use the application display on the screen.
  • There is no need to hold anything in fingers while intending to touch the screen. It is not a harmful so that you need anything in your hand to touch that screen. You can use it directly.

Developed by Dr. Sam Hurst, a professor at the University of Kentucky, when first specimen of touch introduced, it was not transparent consider a landmark in the screen technology. University of Kentucky has copyright reserved of the first specimen known as Elograph. The journey continued and in 1974, first transparent screen. Modern Elographics, a real touch screen, introduced in 1977 is widely used now-a-days, belongs to the resistive screen technology.

The story of touch screen to the knowledge of common folks from the first commercial computer previously it was using behind the scene. They really surprised and enjoyed this new technology. Touch screens are used in hospitals, ATM, in operating units of heavy industries or controlling the machines, touch screen locks. Touch screen is widely used in computer and TV displays and its demand is tremendously increasing.

  • Touch screen technology is introduced in variety of ways. In a daily life we find the use of touch screen, for example,
  • When we go to ATM machine to draw money we have to feed information this we can do by using the touch pad.
  • For the business presentation to demonstrate the point and navigating by touching the display material.
  • Touch screen is mostly user-friendly and make your work quick and easy.
  • In shopping mall, touch screen is an important accessory as it makes the work easy for both customer and salesperson.
  • In restaurant, menu placement, order point, booking system has been replaced with touch screen technology.
  • In present era, time is an important key to success. Self –service make it easy for the people to do their work themselves in hotels, restaurant, shopping malls with the help of automated machines operate able with touch screens. Every individual just know how to use the system hence save the time not only for themselves but others.

There is need to use the touch screen machine with great care as its sensor can be de-active because of misuse. Followings are the pre-cautionary measurements for using the touch screen;

  • Touch screen suffers from ergonomic when finger is used with stress more than needed. A touch screen is touch sensor and it is tuned to a certain pressure. Every individual has different style to touch and this difference sometimes become the reason of disorder of touch screen.
  • For avoiding the direct finger touch, fingernail touch is replaced but is not applicable for capacitive touch screen. Fingernail has the characteristic of not putting scratch on the screen.
  • Stylus is a passive object used to operate touch screen. In many sophisticated mobiles, I-pods, and computers have this accessory with them. Stylus is also not scratching the screen.

Types of Touch Screens

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Touch screens appliances are selling like a hot cake now –a – days because of its easy use and availability in various sizes. Any display device with touch screen feature sell as it comes in the market. Although people appreciate and enjoy this amazing new feature yet most of them don’t know about different types of touch screen. Different types of technologies are used in the formation of touch screen. As technology experiments are going on to derive the best devices ever so is the case with touch screen.

Different types of touch screens have different feature, characteristics and differences. These differences are resulted in different qualities of touch screen; some are long life others are sensitive while some others are economic.

Resistive Touch screen

This type of touch screen is made up of three sheets;

  • conductive
  • resistive
  • protective layer

For making the touch screen conductive and resistive layer are place together with a space between. This space allows the current to pass through it when finger press the screen. This current receive the information is then processed into the desired action. The upper layer on the glass is protection layer so that it protects the screen from scratches in case of odd resistance.

Advantages of Resistive Touch Screen

  • It has comparatively longer life.
  • It is used in many different ways.
  • It is a very common type of touch screen.
  • It is cheap and so approachable.
  • Due to their durability, they are widely used in commercial zone.
  • Disadvantages of Resistive Touch Screen
  • It emits less light as 75 % so fails to give sharp image.
  • Its appearance is bulky.

Capacitive Touch screen

As the name describe the type of this touch screen. A thin capacitor or electronically charge sheet is placed on the glass. In response to the finger touch some of the charge from the capacitive layer shifts to the finger.
An interesting myth works over here for the functionality of touch screen. You know that capacitor works with electricity then what is the reason it responses to the human touch. Do you remember that electric shock is given to the human heart at the time of heart failure? This is because many electrons are moving in the human cells. When we touch the capacitive screen some of the charge from the screen travel towards the finger and on sheet it decreases. This reduction in charge sheet processes the application on touch screen.

Advantages of Capacitive Touch Screen

  • It emits 90% of light ray to make screen clear.
  • It has long life because of the resistivity
  • Disadvantages of Capacitive Touch Screen
  • They are sensitive only for the fingers touch no other object like stylus can be sensed.

Surface acoustic Wave Touch screen

This is the more advanced types of touch screen. They are fast and have sharp image. In this touch screen three sheets are used to perform the action;

  • Sending transducer
  • Receiving transducer
  • Reflectors layer

Both transducers are used in making of screen and these transducers enable the screen to sense the outer touch and reflectors help in giving the proper response. This whole mechanism works through the wave transmission. When we touch the screen a wave produced and transfer from one transducer to the receiver where reflectors get the message. This wave travels back to the specific place and perform the action.

Advantages of surface acoustic wave touch screen

  • Because of this wave mechanism versatile action can be done.
  • Being no electric field created, it emits 100% light resultantly quality image received.

Disadvantages of surface acoustic wave touch screen

  • They tend to have very short life.
  • They are expensive so out of reach of a common man.
  • They can be easily damaged

Types of Screen

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Take a look around your world, how many things you find with the screen? There are TV, computers, laptops, mobiles, electronic appliances with touch screen display. All are made up of different types of screen technologies. Day by day advancement in technology is providing us with the most modified and easy to use appliances which lend a hand in our daily routine to make our work finish in time. Not only these technologies are time-saver but also very innovative.

There are different types of screen technologies which are now-a-days at its peak as compared to the past screen. These are

  • CRT- Cathode Rays Tube (Very first version of screen
  • OLED- Organic Light Emitting Diode
  • DLPT- Digital Light Processing Technology
  • LCD- Liquid Crystal Display (Rapidly replacing CRT)
  • Plasma Display- Latest version

Screen technology is becoming a part of our lives now. It helps us in a variety of ways. It is a useful medium for displaying and sharing information. People were not familiar with this technology till the first TV screen introduced. For a long time cathode rays tube screens were the only choice without any competition. With the advancement in screen technology, now we have choices rather always looking for the latest version whether it is the matter of purchasing new TV, latest mobile phone or laptop. Now CRTs is the thing of past. Many features like display quality, sizes of screens, resolution, and battery are considered much better in modern screens as compared to CRTs. This battle of screen technology has reached the peak of plasma screen which started from CRT. Among all the types of screen technologies LCD is becoming more popular because of its versatility, various sizes, and portability. LCD is light in weight, low power consumption, and is available in compatibility modes.

A limited range of LCD’s were introduced initially but by the time now it is creating a niche market of its own almost in every field such as watches, laptops, mobile, calculator, monitors, charge detector, and screens of digital toys etc.

Others screen technologies are also worth noting; OLED as name describes that it is made up of polymers which has the quality of emitting light itself so are thin and energy saver screen.

Digital light processor screens are capable of producing bigger image with the greater and better range of colour.

Screens with Plasma display have the quality picture with bigger display whereas field emission screen’s resolution is higher. Because of their high resolution they are like CRT screen but better in a sense that their image does not blur. This field emission at one side is its plus point with high resolution but on the other side due to this field emission life of the specific appliance become short. Electronic paper is also in its developing process to replace the previous screen in the field of information.

The process of evolution is continued and there is still hope for the new screen technology. Presently we have many choices of screen in front of us. The journey of the screen technology which began from CRT’s display in the heavy industry travelled through, LED, FED, and DLP and now has been reached to the LCD’s prevailing as niche is still continued.

New innovative ideas are also in progress to introduce new screen technology in the market like Electronic Paper for the common use to compete the LCD in respect of weight, available sizes and presentation versatility. The most common use of a screen technology is to impart knowledge effectively, communicate in a better way, to comprehend the things in better way and struggle is continued to develop the best screen ever.

Resistive Vs Capacitive Touch Screen

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No doubt touch screen is the making its niche rapidly in the field of technology. A device with touch screen is preferred as compared to the device without touchscreen. Everything with a display is now changed into touch display like watches, monitors, laptops, iPhones, MP3s; whatever you think with a display is available in touch screen mode.

Touchscreen is not only single module. There are different types of screens available in market whose touch mechanism is different from one another. Most known touch screen are two types and here we are supposed to discuss the comparison and contrast between the two. It is better to have enough knowledge about two of them so that we should be aware enough to make a right choice according to our demand.

These two types are Resistive and Capacitive touch screens. Here are the Similarities and Dissimilarities between two types of touchscreens depending upon its various features;


General appearance of both types is same as both are used for display. While seeing them in off-mode there seem no particular difference.


Display of both types is available in various sizes but resistive has been even more versatile than capacitive. For example a projector with capacitive touchscreen is not as effective as of resistive touchscreen because our hand does not reach some of the areas on projector which are higher than our height.


Resistive touchscreen is Pressure sensitive while Capacitive touchscreen is HID (Human Interface Device or responsive to the conductive material. When we apply pressure on resistive touchscreen they strike because of the space between two layers and locate the point of touch to carry out the desired command while outer layer on the glass protect the screen from damaging its mechanism.


Capacitive touchscreen is made of capacitive layer with static charge. So glass panel in capacitive touchscreen is more exposed as compared to resistive touchscreen. Now see, resistive layer is made up of three layers so restrict the full emission of light (75 %) from screen which results into bulky image. On the other hand capacitive screen emits 90 % of light as there is only one layer. In short, capacitive touchscreen gives clearer image than resistive touchscreen.


Capacitive touchscreens are more responsive than resistive touchscreens. Pressure applies by different personae make its mechanism weak and with the passage of time it needs more pressure than normal.


Resistive touchscreen is durable than capacitive. Directly expose, the glass panel of touchscreen starts damaging while resistive touchscreens are made up of three layers which helps to protect the glass panel and therefore durable.


Resistive touchscreen is easy to use as it can be operated with any object in hand like stylus etc. But capacitive touchscreen is only operated by finger ouch because it is human interface device. Therefore it is not prefer to use at higher level where stylus is desired to use. Capacitive touchscreen is not responsive to stylus, gloves or other object. It just senses finger touch or an object made up of conductive material.


Touchscreen devices are in demand so are making in variety of range. Here again resistive touchscreens are available in wide rang because of its durability and easy to use but capacitive touchscreen devices like mobiles, laptops and watches are gaining much popularity.


When it comes to the price, capacitive win the race but winning this race loses its niche. People prefer to go for comparatively less expensive resistive touchscreen mobile or whatever they want to purchase.

A comparison of both types of touchscreen is before you, now it’s up to you which medium you like or prefer to purchase. Presently accessories are introducing with capacitive touchscreen so there is no doubt that if not the whole horizon even then for intimate use capacitive is gaining its niche in the future market.

What is Resistive Touch Screen

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Touch screen’s appliances are rapidly developing niche market. To better understand the durability of such appliances is necessary to have specific information about different types of touch screens. There are three types of touch screen of which resistive touch screen are widely used and considers somewhat reliable from the other types of touch screens.

Resistive Touch Screen Mechanism

The mechanism used in the resistive touch screen is pressure detector. It senses the pressure on a specific place and carried on the intended action. Resistive touch screen is made up of three layers. First layer is made up of conductive layer and second is sensitive layer.

These layers are placed upon one another with a space on the glass and further coated with the indium tin oxide a resistant chemical to protect the screen from scratches. When pressure is applied on the screen or the system comes into operational condition current passes through it. In response to the pressure both layers strike with each other and current passes through the space, detects the pressure point by the operating system which resultantly carries out the command.

Resistive Touch Screen Uses

Resistive touch screen mechanism replaces the use of mouse and keyboard for monitor’s direct use. Similarly, mobiles are also available with touch screen with the alternate mode of touch pad system. But complete touch screen enables mobile is more in demand. People are lot more busy and instead of tracing the menu through multiple buttons they better use the touch screen for quick approach. Everything is now just the matter of touch now whether with the finger or stylus.

Advantage and Disadvantages of Resistive Touch Screen

The first and the most important advantage of resistive touch screen is that it is long life. Its durability and reliability are the features which make it enable to incorporate in heavy industry machinery, commercial markets and electronic equipment’s. Another important advantage of this resistive touch screen is that we can touch and perform desired action by touching the screen with anything. There is no limitation to operate the screen with any special object. The screen can be touched by stylus, fingers or nail hence flexible enough as compared to other touch screen technologies. As it is pressure sensitive screen so anyone can use it.

While looking at the negative aspects of the resistive touch screen, the first thing comes into notice is its screen clarity. Due to the production of electric field in response of the touch it emits 75% of light which make the image relatively bulky and dim. Production of bulky image spoils its market.

Resistive Touch Screens are not expensive when compared to other touch screen technologies. Therefore used at commercial basis. In past when people were not aware of touch screen rather a limited number of people were introduced to this technique, Resistive touch screen was incorporated especially in heavy machine control unit to save the time and make the work easy. With the help of touch display switching system become more convenient and replace the big control unit with a compact touch display with all the touch buttons.

Resistive touch screens are pressure sensitive. This feature where lend a hand to perform different function easily and in less time there it does not allow the pressure of full hand on the screen. It is unable to sense touch of stylus and hand at a time. There is need to define the touch by activating the sensor for one and deactivating for the other. In another case multi-touch sensor can also be introduced. Resistive screen is passive mode so is better used with the active touch like finger and mostly avoid the touch of stylus which is also a passive medium.

iPhone Touch Screen

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The very first iPhone touch screen was introduced in 2007 by Steve Jobs which was heartily welcomed by the audience. Most of them were even mesmerized by seeing the ON / OFF only. The iPhone touch screen mechanism was so exciting and interesting that people don’t bother about rest of the application at that time.

Touchscreen Technology is rapidly incorporating in every handy device not to talk about heavy industry and commercial market. In general, as you see, when you touch the screen it gives an active response to your touch. Whatever is visible on the screen can be used as you wish. It’s like a magician who is asking from you to make a wish and your wish would be fulfilled. The difference is only that in fancy tale a magician offers you to make only three wishes but this iPhone touch screen is offering you to make a lot more wishes which are going to be fulfilled. It’s all like a fancy dream but believe on it, this iPhone is a reality.

There are different types of technologies behind the iPhone touch screen to make it functional. Some touchscreens response to the pressure on the glass and some others sense the human touch like finger. This is due to the technologies used in touchscreen mechanism. They are resistive and capacitive touch screen technologies.

In resistive touch screen technology, mobile front glass panel is covered with three different sheets. Conductive and resistive sheets are placed on the glass with a space in between and upper layer is coated with a protective layer to keep the screen save. When we touch the screen with the finger or stylus both layers, conductive and resistive strike and send the outer message to the OS. There touch is analyzed and locate the point of touch and send back the information to carry out the command. In all this process outer most layer performs as a protector of the screen.

In capacitive touch screen of iPhone, glass panel is covered with a capacitive layer having an electric charge on it. An important thing here is this that it senses only human touch not any other. When this capacitive screen is touched by human finger, a little amount of charge shifts from capacitive layer to the finger and this decrease in charge is felt by the system which locates the touch.

As iPhone is widely used by the market and sometime iPhone is operated for multi-tsking use so its touchscreen sometimes troubleshoot. For example, when you intended to operate two applications you will face a pause for sometimes and both of the applications will halt and you stuck in between. Similarly, an iPhone touch screen is touched occasionally; it switches off and on again and again resultantly battery drained without any use which damages the touch system.

There are some limitations in iPhone touch screen mechanism due to which it fails if not uses with great care.

  • The given command cannot find right axis because of the immediate second command.
  • Sometimes average touches at a time are fixed, in case of acceding the average limit of touch again all operations aborted.
  • Every command needs a specific time to process within that time if you touch the screen again it will fail to sense the accurate touch.

Now latest iPhones touch screens are offering multi-touch option to solve these problems. And further this multi-touch offer you many other interesting features like zoom-in or zoom-out with the help of thumb and finger combination. This multi-touch mechanism in iPhone works amazingly accurate because many capacitor plates are arranged like this that each plate works individually and able to carry out respective command to which plate it touches.

How Touch Screen Works

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Think about the time when there was no concept of touch screen technology, if you show them your touch screen mobile phone, they would really impressed by your magic. You would consider a great magician. Even a common man in this present era will be mesmerized by the miracle of this mirror. Their tongue readily wants to speak out that magic word;
Mirror, mirror on the wall!

For making a phone call from your iPhone you just need to touch the desired number or name on screen and call starts processing. Touch Screen is really amazing that apparently black or silver metallic screen suddenly starts giving colors and a page appears in front of our eyes. This miracle is the reality of our present world. We touch and take our desired response from the screen.

How is it possible? How touch screen work? What’s the technology behind this miracle?
Yes, it is the matter of technology. With the advancement in technology, many such miracles are going to become a reality. Screen technology has been developed into touch screen technology and the most demanding feature of the present era.

Touch screen is becoming popular as it is user friendly medium. Everyone can use it without any hesitation. There is no need of any mastery to use touch screen. Whatever is display on the screen can be used as per requirement. Let see how touch screen works.

There are three different systems used in the mechanism of touch screen.

1. Resistive System

In this resistive mechanism of touch screen two sheets are used one is conductive and the other is resistive. Both cover the top glass panel. There is a space between two sheets so that current pass when it is toggle. Now touching the screen forced both layers to contact at a certain point. This contact of both layers cause in the electric field a variation which is informed to the main system that a touch is felt. OS transcribe the touch into desired action.

2. Capacitive System

Second method utilizes in touch screen is capacitive. To understand this mechanism, it is better to know about human biology first. Many chemical reactions take place in our body and electricity produced in result to perform different functions. That is the reason why human heart is recharged with electric shocks for the recovery. Considering human body a cell you can better understand this phenomenon. In this system an electric charge sheet (capacitor) is directly placed on the glass. When we touch the screen with finger, a static charge produces and reacts with the capacitor (electric charge sheet). As the touch screen works due to electric current develop when touches the finger.

3. Surface Acoustic Wave System

This type of touch screen works with the help of wave energy. This enables a touch to transform into another form of energy and deliver the command which in response perform the desired action. A pair of transducers is placed on glass plate sides. In the glass plate there are reflectors. On touching the screen wave produced and which transforms into energy for fulfilling the command. It tells where on the screen touch is detected.
Important Information

First both techniques utilize the electric charge mechanism to develop a touch screen system but the third uses wave system and do not need a metallic plate. This surface acoustic wave system is free of electric field that’s why there is no resistance in the way of light dispersal. This 100 percent light emission gives extra clarity to the screen which is not possible in first two mechanisms. Resistive system enables 75 % of light emission. However capacitive system allows 90% of light emission so better than resistive. Capacitive system enables sharp image as compared to resistive system even then no comparison with the image quality if surface acoustic system.

What is Capacitive Touch Screen

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Day-by-day increase in popularity of touch screen devices also makes people aware of the different types of touch screen. The difference between various kinds of touch screen comes to know by the difference of touch response. There are basically three types of touch screens which is the main reason of differences. Capacitive touch screen is one of them.

Capacitive Touch Screen Mechanism

Capacitive sensors are used to detect the position of touch. Capacitive touch screens are designed to sense the human touch. To better understand the mechanism of capacitive touch screen it is better to know the chemistry of human body first. Human body is made up of many cells with electrons moving in it so human body has an electric charge on it. Therefore a man at the time of loosing heart beat is given electric shock.

In capacitive touch screen, glass panel of a particular device is covered with capacitive layer with static charge. When we touch finger on the screen some of the charge shifts from device to the finger. This decreased charge is noticed by the system. The system processed the information to the OS which tells the exact location of touch.

Capacitive Touch Screen Uses

Resistive touch screen is the already using in heavy industries and now in commercial zone but now capacitive touch screen is also creating its place. The reason is that capacitive touch screen gives clearer picture than resistive. It is used in the displays of computers, mobiles, laptops, iPods and other electronic devices. Touch screen switch boards has been designed instead of mechanical switches and compact MP3 and improved versions are now touch screen incorporated.

Advantages and Disadvantages of Capacitive Touch Screen

A special feature of capacitive touch screen is that it is only responsive to the human touch. In case of any outer touch it does not response. It facilitates to clean the screen with the help of fabric. No unintended command does not harm the screen and does not create hazard to the applications. It gives comparatively better image as compared to resistive touch screen.

Capacitive touch screen gives good response this is because they are acute observer of the slight touch. They are finely tuned to any type of conductive material. Resistive touch screen is made up of three layers which results in bad image but capacitive is thin layered glass screen and able to give comparatively sharp image but even then not as sharp as of Acoustic wave touch screens.

A disadvantage of capacitive touch screen lies inside in its advantage. Where human touch makes work easy and quick on small and standard sized appliances there it becomes problem on a wide screen or if it is placed at higher place. Like it is not suitable for projectors because you cannot use hand everywhere and it becomes difficult to explain a higher point on the projector where your hand is not able to reach.

It is not operate able even with stylus until up till it is of conductive material. If you are wearing gloves for capacitive touch screen you have to remove it. Also if you want to work speedily with the pencil in your hand not to waste time in first placing it on the table for the screen use and then again pick up you just get exhaust and fed up with this fatigue. If your finger is wet again it fails to detect the touch.

One more disadvantage of capacitive touch screen not in a particular sense though, it is expensive. On one side the resulting image is not perfect while on the other side offer high pricing which hinders it making a niche market. They offer less durability hence short life is another drawback.


What is 3D Projector

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3D projectors are used to map a three dimensional data into 2-dimension surface. 3D projector is a very useful instrument to help out in the graphic work of scientists, engineers as well as designers. The process of 3D projection is used for making models in computer, with pen on paper of three dimensional objects. To make 3D projection image certain scale is used or a technique of perspective is applied. But scaling and perspective lose their characteristics once it transcribes three dimensions into two dimensions. Usually 3D is considered as model of an object it is also named to projection process in movie making.

Types of 3D Projectors
During transferring 3-dimension data into two dimension plane a sacrifice is made to lose something readily. There are two types of 3D projection with individual pros and cons.

Perspective Projection:
One way to make 3D projection on to a two dimensional plane is perspective. Perspective creates an impression to the eyes as the object to be seen has three dimensions. However, when the measurements are taken it proves otherwise and do not give equal proportional. The three dimensional effects are created by using eye perspective phenomenon.

Orthographic Projection
It is also the process of projecting three dimensional object on to a two dimensional surface. This technique employs true measurements but object does not show depth. Orthographic projection has many different names as per the nature of object demonstration. These are cross-section, plane, elevation and bird’s eye.

Uses of 3D Projectors:
3D projectors are used in variety of fields. It is not restricted to science only rather mathematics and art also employ this technique to give practical demonstration.

 • Engineers project 3D image into two dimensional surfaces as on the graph paper to show the structural demonstration of a building or house. In the process of 3D projection engineers do drafting by measuring three coordination points.
• Second used of 3D projection is in the field of computer graphics. Using the two dimensional surface of computer a 3D projection is made with the help of graphics software. Computer graphics can project environmental scene or 3 Dimensional objects.
• In the fields of science and mathematics3D projectors are used to make model of natural occurrence or demonstrate an equation.
• 3D projectors are very purposeful and demonstrative as to give effect of real life. It can be seen in movies when impression is made as a three dimensional objects are seen while in actual they are made on two dimensional surfaces.

Depth in the presentation of 3D projection is very important and its origin is traced back in 1920. Since now it has been improved radically yet the mechanism is same. To create depth two images are used to place at the same time on the screen which produce the impact of depth and give three dimensional appearances. Glasses that can filter colors or polarity enable the eyes to see the two distinct images. One’s eye is able to see one image and when both eyes coordinate these two images it produces three dimensional effect.