LED display module board PCB design rules
1, General Provisions
(1) In the case of design rules to meet, should try to reduce production costs, such as: the ability to use 2 layers of make use of two layers; when the cost and design rule violations, to ensure the design rules.
(2) components neatly arranged, the same chip, according to certain rules make the trip into the column; component spacing to consider the production process, can not affect the welding.
(3) for PCB design, can not use automatic layout design.
2, details
(1) the use of routing layers
2 more layers in the design of the circuit board to prohibit within the layer. The inner layer of the same definitions and general use.
For the needs of blind buried via holes designs cell board, the four-layer board, 1-2, 3-4, 1-4 punch; for the six panels, 1-2, 2-5, 5-6 punch; specific technology, PCB manufacturers are required to confirm OK.
(2) separate digital devices and power-driven devices
To be used to separate digital and analog methods of wiring to the digital part of the power seat only power jumper and drive through the entrance portion of the power supply.
In the board room to the case, recommended that the column drivers and row drivers power supply is separate.
(3) power cord and line cord:
Digital part of the power trunk width> = 50mil.
Power line and the line width of the line should be considered a branch of the current power, width, and distance. Ensure that the entrance to the module's power line voltage drop is not greater than 0.01V.
A supply by the middle seat on the board position. When the power seat placement to one side, in the symmetrical side of the reserve power seat or pad to facilitate the production flight line.
When the wiring is difficult, in the board reserved the power pad, fly line to facilitate production.
Line driver circuit board where the power seat or have a separate pad.
Column driver circuit board where the seat or have a separate power supply pad.
Non-welding (pin, row row of holes and cable) for power and cable lines, each needle current of less than 1A, at least two pins for each connection.
For light users have a separate discussion board.
Propose that the line pipe line on the middle of the cell plate to 1 / 3 range.
For the external screen room, light board drive plate separation, line pipe should be placed on the pin nearest the line wires are.
From PCB assembly services in China.