The title sounds quite interesting, doesn't it ? But is it possible ? Will I have to buy expensive stuff ? Well here's the asnwer - No you don't, In fact, the required materials are almost minimum. But before we proceed, what is this 'invisible' monitor ? How is it private ?

To start, the world is full of LCDs isn't it ? That is, Liquid Crystal Displays.  Now, what happens in such a display is varying amounts of a fixed-intensity white backlight is passed through an active filter. The red, green and blue elements of a pixel are achieved through simple filtering of the white light. This filter is called the Polarizing filter. In absence of this filter, the picture on the screen appears white to the human eye due to unfiltered white light. And this is exactly what we do.

Read on to know what you'll need and how to do it.

Materials 

•    LCD Monitor ( Preferably old )
•    Screwdrivers and similar tools ( Depends on your monitor )
•    Some Paint Thinner / Turnpin / Petrol along with Tissues or cloth. (Optional yet highly               recommended )
•    Glass frames.
•    Polarizing film

Method

Step 1 :-  I'm not really going to explain how to disassemble your monitor because, frankly, I know it wont help you. Because every single monitor is different. So instead, I suggest you to find your monitor's model name and search for a tutorial. What we need is the display in our hands,

Step 2 :-   Once you have the display in your hands, its time to get to work. Get a knife/blade or a flat screwdriver and start from the edges. There will be two films - the polarizing film and the anti-glare film. Strong adhesives are used for these films so it will be quite tough removing them. Work hard on it till every piece of film is gone and nothing remains on the display but glue.

 With Thinner or some remover.


        Soak it in hard tissues or a absorbing cloth. Gently spread it over the glue and press it. Be careful to avoid contact with plastic parts as some chemicals may damage it.. Wait about half an hour and then gently remove all layers. Wipe the display clean and clear,

Without a removing chemical

    Get a blade of scrape the glue off. Its quite tough but eventually the finish will be same.


Step 3 :- Reassemble the monitor. Provide input if needed but all you'll see is white screen.
             This is what others would see while you are using the computer !

Step 4 :-  This step is both easy and hard. It depends on the type of frame you have. You have have to cut out the polarizing film in the shape of the frames. You can either -

 a)          Get a frame like in the video for ultimate perfection.
 b)          Go to shop and have it done for the same perfection.
 c)          Find those old blue&red paper 3D glasses and cut it out. Then stick this film.
 d)          Do it your way.


Step 5 :-   Test it and enjoy it.

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An I3DG is a device used to reflect 3 layers of images one infront of each other creating a "half" holographic effect. This is what the I3DG does:

 Video 1

 Video 2

 Video 3


This is a quick and easy guide on how to build one.

All you need is 2 CD cases and a small amount of acrylic plastic.

Step 1: Measuring the plastic

Copy and paste the image into word. Resize the image so the edges of the image are at the corners of the page. Do not crop the image.
Place on page like showen under this text.

Place a sheet of Plastic acrylic on top of the template below and use a pen to mark out key points at the corners. You only need to mark out the top 2 lighter gray shapes.


Place a Cd case on top of the template below and use a pen to mark out key points at the corners. You only need to mark out the top 3 darker gray shapes. 

Step 2: Cut the plastic

Saw around the outside of the shapes. Be careful when you saw the rectangles out as the CD case may brake. Once all of the shapes have been cut out, carefully smooth the corners.

BE CAREFUL NOT TO SCRATCH THE CD CASES AS THIS MEANS THE EFFECT DOES NOT WORK. IF YOU LOOK AT THE PICTURE BELOW THE PLASTIC HAS NO SCRATCHES ON IT.

Step 3: Sticking everthing together

View the paper model to see how everything sticks together:

The 45 degrees angled lines on the lighter gray shapes show where the CD cases rectangles go.
Hold the rectangles next to the 45 degrees lines untill you find the line with the same length and glue onto the line, make sure it is vertically upright.

once you have done that for all the peices place the second side on top and glue on.

This paper model showes how the front section should come together.

Step 4: You have finished!!!

Copy the image below onto your iphone and then place i3dg on top.

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Holograms aren’t just for droids and dead rappers. You can make your own with a piece of transparency paper and a four-sided hologram video. Properly folded, the transparency will combine the images on a phone or tablet screen to create “a reflection that gives you the illusion of an object hovering in space,” says Alex Cronin, a physicist at the University of Arizona.

Make the Hologram

Stats

• Time: 10 minutes
• Cost: $0.30-$1
• Difficulty: Easy

Tools and Materials

• Sheet of transparency paper
• Pencil, pen, or marker
• Ruler
• Compass
• Scissors
• Smartphone or tablet

Instructions

Hologram Template

Use this template to fold the transparency paper into a prism. Cut along the solid black lines and crease along the red lines.

1. Copy the online template onto the transparency, with a radius of 4 inches or more.
2. Cut along the solid black lines, and crease along the red lines.
3. Tape the two opposite sides together to make a prism.
4. Open a four-sided hologram video on your smartphone or tablet. We have one of these videos below, and you can find more by searching for "hologram video" (this is a particularly fun one).
5. Place the small opening of the prism in the video’s center. Look through the side.

Instructions—Without a Template

No printer for the template? No problem!

1. Use a compass and pen to draw a circle with at least a 4-inch radius on the transparency paper. Cut it out with scissors.
2. Mark five dots around the circle, each the radius’ distance apart, and use a ruler to draw a line connecting them.
3. Cutting along the lines, discard the rounded edges and the remaining third of the circle.
4. Fold the trimmed transparency in fourths to make four separate equilateral triangles. Cut off their tips about an inch from the bottom and tape the two opposite sides together to make a prism.
5. Open a four-sided hologram video on your smartphone or tablet. We have one of these videos below, and you can find more by searching for "hologram video" (this is a particularly fun one).
6. Place the small opening of the prism in the video’s center. Look through the side.

More Optics Hacks

A smartphone can perform other optical tricks. Harvest a focus lens from a laser pointer, and attach it to the phone’s camera with some wire. The lens will magnify images to make a DIY microscope (full instructions here). Or stick a few pieces of clear tape over the flash, and color them with blue and purple Sharpie markers. This filter blocks out most visible light and leaves only the ultraviolet spectrum, turning the phone's flashlight function into a blacklight (full instructions here).

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