SSD1812_ View Datasheet(PDF) - Solomon Systech
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SSD1812_ Datasheet PDF : 14 Pages
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APPLICATION NOTE 3: HIGH FREQUENCY MODE
The high frequency mode is an enhanced feature for different applications if a higher oscillation frequency is required.
For the IC used in different countries, there is the possibility with a different mains supply frequency of e.g. 50 and 60 Hz.
Ambient light from 50 Hz system creates ambient light waves with frequencies of multiples of 50Hz, and same situation applies
to 60 Hz mains frequency system.
This multiples of 50Hz/60Hz can interact with the normal operation of the LCD module, thus creating a superimpose interaction
with the LCD module. This phenomenon, if happens, can be picked up as the “flickering”effect.
Solomon Systech Limited add an extra feature to change the oscillation frequency of its SSD181X/SSD1815A/SSD1815B series
IC during initial setup stage. This feature therefore changes the operating frame frequency of the LCD module. It is hoped that
in certain situations and areas, this phenomenon can be reduced.
Modify Oscillation Frequency command:
10101001
X7X6X5.....
For default operation:
For High Frequency mode:
X7X6X5 = 010 (POR for SSD1811, SSD1812) : Typ. 31 kHz
X7X6X5 = 011 (POR for SSD1813, SSD1815, SSD1815A, SSD1815B) : Typ. 17 kHz
X7X6X5 = 110 (POR for SSD1811, SSD1812) : Typ. 38 kHz
X7X6X5 = 110 (POR for SSD1813, SSD1815, SSD1815A, SSD1815B) : Typ. 19 kHz
Example:
The SSD1813 series driver IC has a typical oscillation frequency of 17kHz. By calculation, the frame frequency is then 64.4 Hz.
It is possible to shift the oscillation frequency up to a typical of 19 kHz. The frame frequency is thus shifted up to 73 Hz.
This shift of oscillation frequency can keep the display system away from the ambient light frequency and its harmonics, reducing
interference caused by these ambient light waves.
Note: Slightly higher current consumption in high frequency mode, should be considered.
Application of SSD181X/SSD1815A/SSD1815B to Existing LCD Modules
6
SOLOMON
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