Large LED display system hardware structure and principle

Large LED display system is generally divided into two parts, main control board and display driver module.

　　1. Display driver module

large LED display system driven by progressive. scanning and columns to save hardware cost, use 1/16 progressive-scan mode, the large LED screen is divided into 16 rows with the same name. The principle diagram of the graph display driver module.

every display module for a 64 x 32 pixels of small dot matrix screen, can be divided into two parts, the upper line 16, each part has 8 groups of column data latch. Fluctuation two parts reuse 1 4 son 16 decoder U1, gate drive progressive-scan showed that 1/16 and need 16 columns set drive latches latch column shows the data. Using parallel, line data transmission mode, always need a decoder U2 gating can make latch. Lattice refresh when it needs to use two-stage latches latch column shows data, can appear otherwise display trailing phenomenon. Are showing the data exists in the secondary latch, master threatening the screen to end the first level latch write a line to show the data column data refresh, after the data transmission of the line to display, lock together to secondary latch output and gate drive the next line. Under the way of adopting parallel bus secondary latch, still with the data line 虍 again into the solution of parallel output the economy.

the principle diagram of the graph display driver module

display driver module between horizontal cascade, the thinking of using dislocation cascade, make it has good universality and can be embedded. As shown, each level gating line will be dislocation and spread to the next level at a time, always make the first gate thread BLK_EN0 listed as the first stage of the latch decoder can make the line of control, n gating thread can, in turn, strobe n-tier horizontal cascade module. So you can use the same display driver module arbitrary transverse cascade bar screen.

using the dislocation of the cascade, the transverse cascade on the display driver module of the first level of latch decoder U2 can, in turn, strobe, the decoder can, in turn, gate 1 column data latch. Such horizontal cascade screen the first level of column data latch can be regarded as a continuous storage unit, which is the basis of parallel data transmission using DMA control.

edit: Steve