EM65570
68COM/ 98SEG 65K Color STN LCD Driver
7.21 Partial Display Function
The EM65570 has the partial display function, which can display a part of the graphic
display area. This function is used to set lower bias ratio, lower boost step, and lower
LCD drive voltage. When setting the partial display function, the EM65570 consumes
less power. Partial display function is most suitable for clock indication or calendar
indication when portable equipment is on stand-by.
ELAN
LCD DRIVER
Low Power and
Low Voltage
LCD DRIVER
Normal Display
Partial Display
Figure 7-19 Partial Display Block Diagram
When using the partial display function, it is necessary to keep the following sequence.
Any display condition
Display off (ON/OFF= "0")
Power circuit off (DCON= "0", AMPON= "0")
WAIT
Setting Power Function
* Boost step set
* Bias Ratio set
* Electronic volume set
Power circuit on (DCON= "1", AMPON= "1")
WAIT
Setting Display Function
* Duty Ratio set * Display start common
Display on (ON/OFF= "1")
Partial Display
Figure 7-20 Partial Display Function Sequential Flow Diagram
46 •
Product Specification (V1.0) 09.05.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
