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Detailed photograph of Display panel

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A control unit and a diode matrix are put using 10-mm stud. A control unit is put to the left side and a diode matrix is put to the right. At the photograph above, the studs for its purpose are already put.
A display unit is composed of more than one sheet of printed boards. The point when cutting a printed board is that the lead wire of the 7 segment LED does to the position which doesn't overlap with the edge of the printed board. To prevent display unit's bending, the L angle of aluminum is used for the connection of the printed board. I put an L angle to the component side. It is possible to put to the wiring side. I am using one L angle for the wiring side to prevent panel's bending, being vertical. Therefore, a horizontal angle is put to the component side. When making holes to the L angle, it makes holes at the edge first. It fixes temporarily with the clip so as not for the printed board to move and it puts a mark to the position of the hole. Holes can be correctly made in this way. The holes for putting control unit and the holes for putting a display panel to the case are needed too. The hole to put to the case is five. It is 10 top and the bottom all together. A control unit and a diode matrix are put to the back of the display panel. It is necessary to pay attention so as not for the position of the hole to overlap.
	143 LEDs are used for the category displaying. The height of these LEDs is made the height which is the same as the 7 segment LED. To put an LED to the same height I worked as follows. It passes the lead wire of the LED through the hole of the printed board from the component side. After that, it puts a component side on the flat board, having it down. In this way, it is possible to make the height which is the same as the 7 segment LED. The attention is to put an LED perpendicularly. At first, it solders only one lead wire of the LED. After correcting the position of the LED, it solders another lead wire. In this way, the position of the LED can be arranged beautifully.
	When the LED lights up, a character isn't cleared when the light leaks to the LED next. Therefore, a enclosure which blocks light is put among the LEDs. Black paper is used for the enclosure and slits are put to the interval of the LED. It is made a pin grid array format by combining up and down.
	The paper which composes the enclosure is fixed with the glue so as not for the grid to become apart after combining. Also, the stopper with wire is put to the bottom of the grid for the LED to become of the grid central.