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Making process of Display unit

Latch register circuit Category diode matrix In the improvement this time, I changed the letter of the category, too. The place which the diode mounts is marked with the red pen. The diode can be mounted without making a mistake in this way. Mounting of latch registers and a diode matrix A latch register board is installed between the control circuit board and the diode matrix board.
Because latch registers were added, a regulator for 5V was modified into the 1A type. | The resistors for the LED electric current control are soldered to the lead wire of the LED directly.
This is in the condition that all modifying was complete.