MN838850 PANASONIC [Panasonic Semiconductor], MN838850 Datasheet - Page 7

• Manufacturer Part Number: MN838850
• Description: Source Driver for LCD Panel Drive
• Manufacturer: PANASONIC [Panasonic Semiconductor]

Color TFT LCD Driver
(n 1 to 192)
A
POL
Y
Y
A
Start Signal
Dxx
POL
Dot inversion drive
2n-1
2n
Functional Description (continued)
Since dot inversion drive is used, the analog output voltages with respect to the opposite electrode voltage differ in polarity
for each of the odd and even numbered output pins. This output voltage polarity is controlled by POL. The table below
lists the correspondence between the POL polarity setting, the analog output polarity and the VREF used.
The POL switching timing is presented below.
POL should be switched during the period when A is low, after the last data has been input, and before the next start
signal has been input. The POL signal level is acquired by the device internally on the falling edge of the A signal. The
output polarity is determined by the acquired signal level.
POL
"H"
"L"
One horizontal period
Negative polarity Positive polarity
Positive polarity Negative polarity
VREF9 to 5
VREF4 to 0
Y2n-1
One horizontal period
Last data
VREF4 to 0
VREF9 to 5
Details of the POL Switching Timing
Y2n
Negative
polarity
Positive
polarity
POL Switching Timing
First data
Negative
polarity
Positive
polarity
Last data
Negative
polarity
Positive
polarity
First data
MN838850
Opposite electrode
voltages
7