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LCD CONTROLLER S3C2440A RISC MICROPROCESSOR
15-14
Timing Requirements
Image data should be transferred from the memory to the LCD driver using the VD[7:0] signal. VCLK signal is
used to clock the data into the LCD driver's shift register. After each horizontal line of data has been shifted into
the LCD driver's shift register, the VLINE signal is asserted to display the line on the panel.
The VM signal provides an AC signal for the display. The LCD uses the signal to alternate the polarity of the row
and column voltages, which are used to turn the pixels on and off, because the LCD plasma tends to deteriorate
whenever subjected to a DC voltage. It can be configured to toggle on every frame or to toggle every
programmable number of VLINE signals.
Figure 15-4 shows the timing requirements for the LCD driver interface.