SSD1789A Solomon Systech, SSD1789A Datasheet - Page 44

• Manufacturer Part Number: SSD1789A
• Description: CSTN LCD Driver
• Manufacturer: Solomon Systech

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9.8
This command specifies the starting block address of the area scrolling and then executes the area scroll by
changing the start block address dynamically. Start block < End block must be maintained. Please be noted
that the set scroll start command should be executed after the set area scroll command.
9.9
This command turns on/off the various power circuits associated with the chip. There are three power sub-circuits
(reference voltage generator, internal regulator and voltage follower) could be turned on/off by this command. In addition,
the configuration of the internal primary booster (4X/5X/6X/7X) can be selected by this command.
9.10 Set Contrast Level and Internal Regulator Resistor Ratio (81 Hex)
This command adjusts the contrast of the LCD panel by changing the LCD driving voltage, V
power circuits. V
refer to the Figure 12 for the contrast control process flow diagram.
Figure 12 - Contrast Control Flow Set Segment Re-map
This command also sets the feedback gain of the internal regulator. There are altogether 8 internal regulator gains, which
are used for the adjustment of V
for different regulator gains when using internal regulator resistor network. The Contrast Control Voltage Range curves is
referred to the following formula:
Solomon Systech
Set Scroll Start (AB Hex)
Set Power Control Register (20 Hex)
Set Contrast Control Register
No
V
V
Please refer to Table 15-DC Characteristic for V
Contrast Level Data
OUT
CON
OUT
Complete?
Changes
is set with 64 steps (6-bit) in the contrast control register by a set of compound commands. Please
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= (1 +
= (1 + R
Yes
OUT
2
level. This command is to enable any one of the eight internal resistor (IRS) settings
/R
1
) * V
V
CON
REF
, where V
REF
at other TC values.
REF
Jul 2004
= 1.105V at TC0,
P 44/69 Rev 1.0
OUT
, provided by the On-Chip
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