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KS0066U and KS0065 LCD driver power saving technique

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mingming

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ks0065

I am working on a battery powered LCD message clock project using KS0066U plus KS0065B to drive a 16 x 2 character display. The unit is powered by 4 x AAA battery. The datasheet of KS0066U says the current rating at 5V is just 0.15mA. However, the power consumption of a LCD module constructed with these two IC is above 1.5mA. The battery capacity is 500mAh so the unit can last for only 2 weeks!

1. Why does the module take so much current?

2. Any method to reduce power consumption to half? There are many compatible chips from OKI, Anpec, Sitronix, Epson. Which consume less power?

3. The default oscilating frequency is 270KHz. Can I reduce the operating frequcney to 125Khz and save some energy?

4. The VLCD voltage devider resister network also consume power. Is there a low power method to generate te VLCD voltage with minimal current?

Any comments are appreciated!
 

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