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Epson Research and Development Page 29
Vancouver Design Center
Programming Notes and Examples S1D13708
Issue Date: 01/11/20 X39A-G-003-01
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6.3 LCD Power Sequencing
The S1D13708 requires LCD power sequencing (the process of powering-on and
powering-off the LCD panel). LCD power sequencing allows the LCD bias voltage to
discharge prior to shutting down the LCD signals, preventing long term damage to the panel
and avoiding unsightly “lines” at power-on/power-off.
Proper LCD power sequencing for power-off requires a delay from the time the LCD power
is disabled to the time the LCD signals are shut down. Power-on requires the LCD signals
to be active prior to applying power to the LCD. This time interval depends on the LCD
bias power supply design. For example, the LCD bias power supply on the S5U13708B00B
Evaluation Board requires about 50 ms to fully discharge. Other power supply designs may
vary.
This section assumes the LCD bias power is controlled through GPO0. The S1D13708
GPIO pins are multi-use pins and may not be available in all system designs. For further
information on the availability of GPIO pins, see the S1D13708 Hardware Functional
Specification, document number X36A-A-001-xx.
Note
This section discusses LCD power sequencing for passive and TFT (non-HR-TFT) pan-
els only.
For further information on LCD power sequencing the HR-TFT, see Connecting to the
Sharp HR-TFT Panels, document number X36A-G-011-xx.
For further information on LCD Power Sequencing the D-TFD, see Connecting to the
Epson D-TFD Panels, document number X36A-G-012-xx.