em65570sagh ELAN Microelectronics Corp, em65570sagh Datasheet - Page 44

• Manufacturer Part Number: em65570sagh
• Description: 68com/98seg 65k Color Stn Lcd Drivers
• Manufacturer: ELAN Microelectronics Corp

EM65570S
68COM/98SEG 65K Color STN LCD Drivers
38 x
7.20 Partial Display Function
The EM65570S has a partial display function, which can display part of the graphic
display area. This function is used be set lower bias ratio, lower boost step, and lower
LCD drive voltage. Since setting partial display function, EM65570S provides low
power consumption. Partial display function is the most suitable for clock indication or
calendar indication when a portable equipment is stand-by.
When using the partial display function, it is necessary to keep following sequence.
Select a display duty ratio for the partial display from 1/8 to 1/72 using the DS (LCD
duty ratio) register.
Set the most suitable values for LCD drive bias ratio, LCD drive voltage, electronic
volume, the number of boosting steps, and others according to the actually used LCD
panel and the selected duty ratio.
ELAN
LCD DRIVER
Low Power and
Low Voltage
Normal Display
Power circuit off (DCON= "0", AMPON= "0")
Power circuit on (DCON= "1", AMPON= "1")
* Boost step set
* Bias Ratio set
* Duty Ratio set
Figure 7-7 Image of Partial Display
Display off (ON/OFF= "0")
Display on (ON/OFF= "1")
Setting Power Function
Setting Display Function
Any display condition
Partial Display
(This specification is subject to change without further notice)
WAIT
WAIT
* Display start common
* Electronic volume set
Product Specification (V1.0) 04.18.2006
LCD DRIVER
Partial Display