Sunday, April 3, 2011

【 Weak current College 】 LED display frequently used signal interpretation 】

CLK clock signal: available to shift register shifting pulses, each pulse will cause data moved into or out of a bit. The data on the data port must be coordinated with the clock signal to normal shipping data, data signal frequency is the frequency of the clock signal 1/2 times. In any case, there are exceptions when the clock signal, will make the complete Board show disorganized.
STB latch signal: will shift registers the data sent to latch, and its data content through the driver circuit lit LED display. But because of the driver circuit is EN enable signal control, whose premise of light must be enabled to open. Latch signal also needs to be coordinated with the clock signal to show the full image. In any case, when a latch signal with exception makes the complete Board show disorganized.

EN enable signal: full screen brightness control signal, and is also used to screen blanking. As long as the adjustment of its duty to control brightness changes. When the signal when an exception occurs, the screen will be lit, Dim light or smearing.

Data signal: display image needed data. Must be coordinated with the clock signal to transmit data to any of the display. General display in red-green-blue signal separation of data, if a data signal circuit to positive or negative, then the corresponding that color will appear fully lit or unlit, when the data signal is suspended when the corresponding color display case.

ABCD line signal: only in dynamic scanning is displayed there, ABCD is a binary number, A is the lowest bit, if you use the binary representation of the ABCD signal control maximum range is 16 lines (1111), 1/4 scans can be as long as AB signal because AB signal indicates that the range is 4 lines (11). When the line control signals when an exception occurs, it will appear dislocation, the highlight or images overlap.

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