Samsung S3C9228/P9228 user manual LCD Voltage Dividing Resistors, Bias, Common COM Signals

LCD CONTROLLER/DRIVER S3C9228/P9228

LCD VOLTAGE DIVIDING RESISTORS

1/5 Bias 1/4 Bias 1/3 Bias

S3C9228/P9228

VDD

LMOD.4

VLC1

R

VLC2

R

VLC3

R

VLC4

R

VLC5

R

VSS

S3C9228/P9228

VDD

LMOD.4

VLC1

R

VLC2

R

VLC3

R

VLC4

R

VLC5

R

VSS

S3C9228/P9228

VDD

LMOD.4

VLC1

R

VLC2

R

VLC3

R

VLC4

R

VLC5

R

VSS

Figure 13-6. Internal Voltage Dividing Resistor Connection

COMMON (COM) SIGNALS

The common signal output pin selection (COM pin selection) varies according to the selected duty cycle.

—In 1/3 duty mode, COM0-COM2 pins are selected

—In 1/4 duty mode, COM0-COM3 pins are selected

—In 1/8 duty mode, COM0-COM7 pins are selected

SEGMENT (SEG) SIGNALS

The 19 LCD segment signal pins are connected to corresponding display RAM locations at page 1. Bits of the display RAM are synchronized with the common signal output pins.

When the bit value of a display RAM location is "1", a select signal is sent to the corresponding segment pin. When the display bit is "0", a 'no-select' signal to the corresponding segment pin.

13-6