For the production of a video projector (projection television), only an old monitor and a projector are required to display transparent films (mainly used in educational institutions - cadascop, it is a graphical projector, it is also an overhead projector)
For our purpose, any monitor of the desired diagonal (15 ", 1024 x 768) is suitable.Of course, the cheapest option is to use a used monitor.We mean that we will not need either a backlight or a monitor case, so the search field is quite wide - service centers, online flea markets, etc.
Possible, the purchase of a new monitor. Just be aware that the risk of breaking anything when disassembling (or assembling back in case of something) is different from zero, so even before buying a monitor, be ready to cancel the warranty.
In addition to computer monitors, you can use matrices from portable LCD TVs. A small diagonal (6-8 inches) makes the projector more compact. In addition, using the LCD TV, you get both an SVGA input, a linear low-frequency Video input, and a TV tuner. True, cheap models have poor contrast and colors, and the resolution of such matrices is usually 640x480 or 800x600, i.e. For a large 2m screen is not too suitable.
We proceed to disassemble the monitor. First, remove the top cover. Then, all the wires and loops between the cards are disconnected, and the wires that go inside the case to the matrix and backlight. Then all the cards are unscrewed. After that, the metal casing is removed.
The metal frame and the plastic frame or their analogues are most likely present in all monitors. I recommend that they be saved unscathed, because there is no better way to fix the matrix further.
As a result we have a matrix, frames and a controller.
Install the LCD matrix on the projector, but do not forget to leave a gap of 5mm. Between the matrix and the glass and fix it with a metal and plastic frame
When working in the projector, the matrix is exposed to significant heat loads. The guarantee of reliable performance of the matrix is high-quality cooling. According to generalized data, the limiting temperature of the matrix is 50-60 degrees. When this temperature is exceeded, a brown (or other color) spot appears on the image. The appearance of a stain indicates overheating, but does not immediately lead to the destruction of the matrix. Therefore, if you quickly take measures (turn off the heat source), then after cooling the spot disappears and the matrix will restore its characteristics. But in order to automate the cooling process, it is advisable to attach a cooling fan to the video projector.
Homemade video projector with installed LCD matrix.
The video projector is in operation. The principle is the same as the projection of transparent films.
Projection on the wall.
If you compare prices for modern projectors and prices for raw materials for such a homemade, then the option does not seem so crazy.
Comments
When commenting on, remember that the content and tone of your message can hurt the feelings of real people, show respect and tolerance to your interlocutors even if you do not share their opinion, your behavior in the conditions of freedom of expression and anonymity provided by the Internet, changes Not only virtual, but also the real world. All comments are hidden from the index, spam is controlled.