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Epson Research and Development

 

Vancouver Design Center

 

 

6.5 Adjustable LCD Panel Negative Power Supply (VLCD)

For those LCD panels requiring a negative power supply to provide between -23V and - 14V (Iout = 25mA) a power supply has been provided as an integral part of this design. The VLCD power supply can be adjusted by R21 to give an output voltage from -23V to -14V and is enabled and disabled by the active high LCDPWR control signal of S1D13705 and inverted externally.

Determine the panel’s specific power requirements and set the potentiometer accordingly before connecting the panel.

6.6 Passive/Active LCD Panel Support

The S1D13705 directly supports:

4/8-bit, single and dual, monochrome passive panels.

4/8-bit, single and dual, color passive panels.

9/12-bit, TFT active matrix panels.

All the necessary signals are provided on the 40-pin LCD connector J5. For connection information, refer to Table 5-1: “LCD Signal Connector (J5)” on page 18.

The buffered LCD connector (J5) provides the same LCD panel signals as those directly from S1D13705, but with voltage-adapting buffers selectable to 3.3V or 5.0V. Pin 32 on this connector provides a voltage level of 3.3V or 5.0V to the LCD panel logic (see “JP6 - LCDPWR Polarity” on page 14 for information on setting the panel voltage).

6.7 Power Save Modes

The S1D13705 supports one hardware and one software power save mode. The hardware power save mode needs to be enabled by setting REG[02h] bit1 to 1 and then can be activated by DIP switch SW1-6. See Table 3-1: “Configuration DIP Switch Settings” on page 10.

S1D13705

S5U13705B00C Rev. 2.0 Evaluation Board User Manual

X27A-G-014-02

Issue Date: 2002/09/16

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Epson S1D13705 technical manual Adjustable LCD Panel Negative Power Supply Vlcd, Passive/Active LCD Panel Support