Retractable screen in the car with your own hands. Installing a monitor in a car
rail module 1.
Straight gear. 
bevel gears. 
Servo SM-S4315R 
continuous rotation to move the carriage horizontally.
Servo SM-S8166M 
to lift the monitor.
Linear bearings of the MGN 15 series. 
Arduino Nano controller.
DC_DC converters for powering servos. 
Optical interrupters (limit switches). 
The whole structure is made of aluminum profile.
Let's start with the base frame. The dimensions of all blanks and parts must be as accurate as possible. Hundreds of millimeters can be ignored, even tens can be ignored, but in millimeters everything should be accurate. So we make a frame. We use traction rivets. We check the corners - 90 ° is a prerequisite. We fix linear bearings. I used rivet nuts. I put all threaded connections on such a latch 
- Vibration protection and all that...
We put one bevel gear on a large servo. 
I still use the same threadlocker.
We make a carriage. 
Aluminum corner used 3 mm thick. It must bear the brunt. We make markings for a large servo and side brackets. I made the side brackets according to this principle: I inserted a 12x12 mm square into a rectangular pipe 30x15x1.5 mm and pressed everything with screws. All aluminum that I use in my work is structural and GOST-sized, so you can choose everything according to size. So the inner size of the rectangular pipe perfectly matched the outer size of the square. 
We drill holes for radial miniature bearings. Here I use 6 x 10 x 3 mm ones. 
I want to draw attention to such a moment - first we drill a blind hole Ø6 and a depth of no more than 10 mm. Then we expand the hole to Ø10 and max 5 mm deep. Let me explain why this is needed. The bearing that I use has a flange - it will prevent it from falling into the hole and in the future will allow it to be conveniently fixed. And in the recess Ø6 we put a ball from a bearing Ø 5-5.5 mm so that in the future our axis does not “wedge”, resting on the end. Now we will make the platform for the monitor itself. I want to add that the described option is made for a tablet with a size of 190x112x10. Having estimated the dimensions, I cut out such a “podium”. 
"Legs" are made according to the principle of the brackets described above. Axle made of brass rod Ø6 mm. The "legs" are screwed and glued tightly with such glue. 
It turned out to be a very good glue. Convenient to work. It doesn't "get up" right away. After curing, it becomes very durable. It turned out such a knot. 
It looks like a carriage with a "hinge". 
To close the gear assembly, such a part was made. 
I made it from a pipe and two corners. First I glued it with glue, and then filled the cavities with epoxy. 
Then I cut out everything superfluous and got this. 
Sample on the frame 
Next, I make the front part with the lid. 
We mount the electrical part on the frame. 
All elements of the front part were painted black. After the final assembly, the mechanism acquired this form. 
The variant that I will describe uses a rack and pinion to move the carriage and a bevel gear to raise the monitor to a vertical position. System components:
Rail module 1.
Straight gear.
bevel gears.
Servo machine SM-S4315R continuous rotation to move the carriage horizontally.
Servo machine SM-S8166M for lifting the monitor.
Linear bearings of the MGN 15 series.
Arduino Nano controller. 595886
DC_DC converters for powering servos.
Optical interrupters (limit switches).
The whole structure is made of aluminum profile.
Let's start with the base frame.
The dimensions of all blanks and parts must be as accurate as possible. Hundreds of millimeters can be ignored, even tens can be ignored, but in millimeters everything should be accurate. So let's make a frame. We use traction rivets. We check the corners - 90 ° is a prerequisite. We fix linear bearings. I used rivet nuts. I put all threaded connections on such a latch
Vibration protection and all that...
We put one bevel gear on a large servo. I still use the same threadlocker.
We make a carriage.
Aluminum corner used 3 mm thick. It must bear the brunt. We make markings for a large servo and side brackets.
I made the side brackets according to this principle: I inserted a 12x12 mm square into a rectangular pipe 30x15x1.5 mm and pressed everything with screws.
All aluminum that I use in my work is structural and GOST-sized, so you can choose everything according to size. So, the inner size of the rectangular pipe perfectly matched the outer size of the square. We drill holes for radial miniature bearings. Here I use 6 x 10 x 3 mm ones.
I want to draw attention to such a moment, first we drill a blind hole? 6 and no more than 10 mm deep. Then we expand the hole to? 10 and a depth of max 5 mm. Let me explain why this is needed. The bearing that I use has a flange, it will not let it fall into the hole and in the future will allow it to be conveniently fixed. And in the recess? 6 put the ball from the bearing? 5-5.5 mm so that in the future our axis does not “wedge”, resting on the end.
Now we will make the platform for the monitor itself. I want to add that the described option is made for a tablet with a size of 190x112x10. Having estimated the dimensions, I cut out such a “podium”.
"Legs" are made according to the principle of the brackets described above. An axis from a brass bar? 6 mm.
The "legs" are screwed and glued tightly with such glue.
It turned out to be a very good glue. Convenient to work. It doesn't "get up" right away. After curing, it becomes very durable. It turned out such a knot.
It looks like a carriage with a "hinge".
To close the gear assembly, such a part was made.
I made it from a pipe and two corners. First I glued it with glue, and then filled the cavities with epoxy.
Then I cut out everything superfluous and got this.
Sample on the frame.
We mount the electrical part on the frame.
All elements of the front part were painted black. After the final assembly, the mechanism acquired this form.
bevel gears.
Servo machine SM-S4315R continuous rotation to move the carriage horizontally.
Servo machine SM-S8166M for lifting the monitor.
Linear bearings of the MGN 15 series.
Arduino Nano.595886 controller
DC_DC converters for powering servos.
Optical interrupters (limit switches).
The whole structure is made of aluminum profile. Let's start with the base frame.
The dimensions of all blanks and parts must be as accurate as possible. Hundreds of millimeters can be ignored, even tens can be ignored, but in millimeters everything should be accurate. So we make a frame. We use traction rivets. We check the corners - 90 ° is a prerequisite. We fix linear bearings. I used rivet nuts. I put all threaded connections on such a latch
- Vibration protection and all that...
We put one bevel gear on a large servo. I still use the same threadlocker.
We make a carriage.
Aluminum corner used 3 mm thick. It must bear the brunt. We make markings for a large servo and side brackets.
I made the side brackets according to this principle: I inserted a 12x12 mm square into a rectangular pipe 30x15x1.5 mm and pressed everything with screws.
All aluminum that I use in my work is structural and GOST-sized, so you can choose everything according to size. So the inner size of the rectangular pipe perfectly matched the outer size of the square. We drill holes for radial miniature bearings. Here I use 6 x 10 x 3 mm ones.
I want to draw attention to such a moment - first we drill a blind hole Ø6 and a depth of no more than 10 mm. Then we expand the hole to Ø10 and max 5 mm deep. Let me explain why this is needed. The bearing that I use has a flange - it will prevent it from falling into the hole and in the future will allow it to be conveniently fixed. And in the recess Ø6 we put a ball from a bearing Ø 5-5.5 mm so that in the future our axis does not “wedge”, resting on the end.
Now we will make the platform for the monitor itself. I want to add that the described option is made for a tablet with a size of 190x112x10. Having estimated the dimensions, I cut out such a “podium”.
"Legs" are made according to the principle of the brackets described above. Axle made of brass rod Ø6 mm.
The "legs" are screwed and glued tightly with such glue.
It turned out to be a very good glue. Convenient to work. It doesn't "get up" right away. After curing, it becomes very durable. It turned out such a knot.
It looks like a carriage with a "hinge".
To close the gear assembly, such a part was made.
I made it from a pipe and two corners. First I glued it with glue, and then filled the cavities with epoxy.
Then I cut out everything superfluous and got this.
Sample on the frame
Next, I make the front part with the lid.
We mount the electrical part on the frame.
All elements of the front part were painted black. After the final assembly, the mechanism acquired this form.
In many cars, there is not enough monitor in the cabin. You can connect a rear view camera, display information from the on-board computer and multimedia. There are many options for installing a monitor. It is quite difficult to choose the best option from the whole variety, but it is worth choosing based on your needs and car model. Monitor instead of regular multimedia system. There are a lot of options for such equipment on sale now. There are models of the 1DIN standard with a retractable screen that will fit almost any car. As a rule, these are models with a 7-inch monitor, which are perfect for both navigation and a rear view camera. Such multimedia systems can be quite functional, but the retractable screen often breaks, especially if you buy a cheap model of a little-known brand. In modern models, multimedia systems of the 2DIN standard are increasingly used. This also includes branded multimedia models installed at the factory.
In fact, these are the same systems, with a motorized screen, but without this serious drawback. These electronics are more reliable, and in the case of special models, they also fit perfectly into the interior. Separate monitor in the car. Such models are much easier to install, but they require a signal source. You can, for example, connect a rear view camera or connect to a regular media system. Such a monitor is now extremely rarely used, even finding it on sale has become much more difficult. Headrest monitors can be used to entertain rear passengers. This option may well be of interest now. Now media systems that are installed instead of standard rear-view mirrors are becoming very popular. In the off state, it is a familiar mirror, and when it is on, it is a quite informative monitor with a diameter of about 5 inches. In addition to the ability to connect a rear view camera and other video sources, such devices often combine a DVR, a radar detector and a navigator, and also work on the Android operating system. Some car owners put a tablet in the car, which replaces both the multimedia system and the screen for the rear view camera. Such alterations require a serious approach. Sometimes you have to completely redo the center console, come up with a power system and connect speakers, on-board systems and additional equipment. This option is not recommended, since household devices are not prepared to work in a car, although they are sometimes more functional.