SSD1789A Solomon Systech, SSD1789A Datasheet - Page 47

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

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9.23 Read display data mode (5D Hex)
This command is used to execute the read display data mode. The display data byte is directly read from the
GDDRAM. Please be noted that the
GDDRAM.
9.24 Set biasing ratio (FB Hex)
This command selects a suitable bias ratio (1/7 to 1/10) required for driving the particular LCD panel in use.
9.25 Set Frame Frequency (F2 Hex)
This command specifies the frame frequency so as to minimize the flickering due to the ac main frequency.
The frequency is set to 75 Hz after POR.
9.26 Set N-line inversion (F2 Hex)
Number of line inversion is set by this command for reducing crosstalk noise. 2 to 64-line inversion operations
could be selected. At POR, this operation is set to 10000b (17 lines). It should be noted that the total number
of mux (including the icon line) should NOT be a multiple of the inversion number (n). Or else, some lines will
not change their polarity during frame change. The n-line counter can be set such that it will be reset per
display frame (POR).
9.27 Select PWM/FRC (F7 Hex)
This command set the Pulse Width Modulation, Frame Rate Control or mix of FWM & FRC.
9.28 OTP setting (F6 Hex)
OTP (One Time Programming) is a method to adjust V
in term of contrast level, OTP can be used to achieve the best contrast of every LCD modules. Each OTP bit
can be programmed to ‘1’ one time.
OTP setting and programming should include two major steps. Find the OTP offset and OTP programming as
following,
SSD1789A Series Rev 1.0
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P 47/69 Jul 2004
D/
C
signal should be set to high during the display data is red from to the
OUT
. In order to eliminate the variations of LCD module
Solomon Systech
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