Illustrated step-by-step tutorial on using MP4 to create your own projector

Let you Want to try turning your MP4 into a 40-inch projector or a movie projector? Maybe you haven't thought of it at all, or you may think that even if it is possible, the cost is too high. Today I will tell you a simple way to use your MP4to hand-make an MP4 projector instrument. One may ask whether the cost is too high? So if I told you that the cost is only ten yuan, would you believe it? Okay, without further ado, let me tell you in detail the production process of an MP4 projector!
Materials and tools: MP4 player; shoe boxes with at least one large and one small; high-transmission magnifying glass (ten yuan), used scotch tape paper rings, scotch tape.
Overview: To make a portable projector, the light source is the first problem that must be solved (it cannot generate heat, the power supply voltage cannot be too high, and it also needs to reach a certain brightness).
In order to meet the above needs, I decided to use high-brightness light-emitting diodes as the light source of the projector. Since I have used Nokia 2100 mobile phone before, I know that the keyboard light of this phone is particularly bright. So, I went to the second-hand mobile phone market to look for the light-emitting diodes on the keyboard of Nokia mobile phones. The hard work paid off, and after three market dives, I finally bought back 140 such diodes at a price of 0.5 yuan/piece. The diodes are very small and use the pasting technology, so I connected three of them in series, making a total of 46 groups. Then I connected these 46 groups of diodes in parallel and pasted them on a 5cm×6cm insulating board. , use a 12V, 2.5A power supply to test, hey! It’s like a little sun, lighting up the whole room. After powering on for 20 minutes, touch the diode with your hand. The center part is slightly hot, but the temperature at the edge does not increase significantly. Now, the projector light source is ready (note that diodes have polarity, if the polarity is wrong, the three diodes connected in series will not light up).
Open the Sony Ericsson MP4 and gently tear open the backlight reflection behind the MP4 LCD screenPaper, you will find that there are three same light-emitting diodes behind the screen itself. Ignore it. Separate the screen and MP4 driver board from the LCD screen, then place them in a vertical position and fix them in a portable case you have prepared in advance. , place the homemade light source above in parallel behind the LCD screen (keeping a certain heat dissipation distance from the LCD screen). Note that the LCD screen and driver board should be placed upside down to ensure that the projected image is correct. In addition, you can use wires to lead the touch buttons and USB interface of the driver board to the top or side of the chassis, and install corresponding buttons and USB interfaces on the chassis to prepare for downloading files. You can also place the driver board directly on the outside of the chassis and put a small patch on the chassis for easier operation. In order to achieve the overall portable effect, you can also use a 7805 to connect the MP4 power supply to the 12V projection box lighting power supply and assemble it in a portable box. Of course, you can also save this process and make the MP4 and projection box power supply independent.
After the above operations are completed, you can install the lens and test the machine. I use a very ordinary magnifying glass. I use a spiral cylinder to place the magnifying glass inside to adjust the focus. You can also use a camera lens instead. I just want to save money. If you have a professional lens, the effect will be better. will be better.
Turn on the projector made according to the above method and place it on a white wall at home. The effect is very good. Readers and friends may also try it.
The above projectors can be equipped with three mobile phone batteries connected in series, or six mobile phone batteries connected in series and used in parallel, so as to achieve the purpose of true portability. Lets start, DIY an MP4 projector, use a shoebox magnifying glass to find the feeling of watching outdoor movies in childhood, haha~
Draw up a three-view drawing, the design idea is very simple, use the refraction principle of convex lens and plane mirror, hehe~

Materials and Tools: MP4 player; shoe boxes must have at least two, one large and one small; magnifying glass purchased at a 2 yuan store;

Cut the plastic bottle containing the plasticine into two pieces at waist level, and cut off the plastic handle of the magnifying glass

Put the magnifying glass Secure the bag inside

Installing projection Lens of the instrument: Place a paper ring of used transparent tape inside the shoe box, stick it with a tape, and then stick the magnifying glass on the front, so that the lens is ready. Dig a hole in the big shoe box and install it. Lens (I accidentally cut off the thread at the bottom of the bottle, but I just kept this one. You can use the blue cap as a dust cover for the lens)

After the lens hole is drilled, you need to make a tie rod for adjusting the focus. Dig a gap at the back of the shoe box that is the height and width of the shoe cover (usually a womens shoe box), and leave it as a can Pull the sliding track and make an MP4 fixed bracket inside (you can use the remaining half of the shoe box). The method is very simple, just use another shoe box and snap it onto the shoe cover made before, and then put Cut off the other half of the shoe box and glue it with transparent tape to form a base. Use the body of the small shoe box to make an MP4 bracket according to the size of the MP4 player. The lid of the box can be used as the focusing support plate below. The front is fixed to the pallet with tape

Find it For videos, it is best to use cartoons with stronger color contrast, which will have better effects. I recommend Lao Jiang’s animation, hehe~

Adjust Volume, put the MP4 player upside down into the cradle

Pull out the support plate to adjust the focus. This is so simple that Meizi can operate it alone.

Using childrens shoes He made a small TV with his daughter. Maizi laughed and said that the TV his father had when he was a child was just a microwave oven, haha~

Put the video It is projected on a screen made of rice paper from the back. The projection effect is not bad when viewed from the front.

< /p>Looking at it this way is just a small TV, which is too boring. It is more like a movie if you project the video on a white wall, but the subtitles will become reversed. To solve this problem, you have to install another reflector.

Reflector It is glued to a piece of cardboard and fixed to the pallet with tape on the front side. It can be lifted up.

By hand Lift the bracket like this

The reflector will naturally form a 45-degree angle

In Bai I adjusted the focus on the wall and turned off all the lights for testing. It became normal to see the subtitles. The video can be placed in half-open paper size and is still clear.

It would be nice to have some small holes punched in the cover, and the heat dissipation speakers should also be blocked from light. You can own an MP4 projector for only ten yuan, and the projector looks professional enough. . . With a DIY projector made from waste materials, you can enjoy it at home, whether sitting or lying down. Or you can give it as a gift. . .