The traditional Hi-FAS system uses several capacitors for its power supply system. So it may cause difficulties for the module designers. The GreenDriver (Sitronix’s Hi-FAS) power supply system minimizes the number of capacitors for the benefit of the LCD module vendors. With a minimum number of capacitors a high quality, high performance display can be designed.

Because segment signals change the output according to the display pattern, the segment signal switching frequency is much faster than the common signal. As the switch frequency increases, the transient current and power consumption of segment drivers are greater than common drivers.
By using very low segment voltage, the waveform of GreenDriver can achieve a relatively low transient current when compared with the traditional driving methods. With a much higher output voltage, the traditional waveform causes large power consumption while under the transient state. However the GreenDriver waveform uses very low segment voltage so the transient current caused by the segment switching in GreenDriver technology is much lower than in a traditional system.

GreenDriver uses Hi-FAS technology which saves more space in the size of the chip. The segment outputs of our Hi-FAS system use a low-voltage process due to their unique driving waveform design. Traditional drivers, on the other hand, use a high voltage process for segment outputs. The low voltage process that we use in GreenDriver takes less space than the high voltage process. As the segment output number increases, more space can be saved. That's why GreenDriver Technology can have such a small dice size.

■ Different Liquid Crystals have various temperature responses.
A selectable temperature compensation curve is useful for LCD module vendors to fine tune the display quality.
■ GreenDriver has 16 segments and 16-line selectable slopes from -40°C to 88°C that can completely fit the temperature compensation curve of the customers’ liquid crystal.