User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 785
www.energymicro.com
Figure 33.36. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_COM3
V
LC0
(V
LCD
)
V
LC1
(2/3V
LCD
)
V
LC3
(V
SS
)
V
LC2
(1/3V
LCD
)
Frame Start Fram e End
1/3 bias and quadruplex multiplexing - LCD_SEG0
The LCD_SEG0 waveform on the left is just an example to illustrate how different segment waveforms
can be multiplexed with the COM lines in order to turn on and off LCD pixels. As illustrated in the
figures below, this wave form will turn ON pixels connected to LCD_COM0 and LCD_COM2, while pixels
connected to LCD_COM1 and LCD_COM3 will be turned OFF.
Figure 33.37. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_SEG0
V
LC0
(V
LCD
)
V
LC1
(2/3V
LCD
)
V
LC3
(V
SS
)
V
LC2
(1/3V
LCD
)
Frame Start Fram e End
Figure 33.38. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_SEG0 Connection
com1
com2
com3
com0
seg0
1/3 bias and quadruplex multiplexing - LCD_SEG0-LCD_COM0
• DC voltage = 0 (over one frame)
• V
RMS
= 0.58 × V
LCD_OUT
• The LCD display pixel that is connected to LCD_SEG0 and LCD_COM0 will be ON with this waveform
Figure 33.39. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_SEG0-LCD_COM0
V
LC3
(V
SS
)
V
LC0
(V
LCD
)
V
LC1
(2/3V
LCD
)
V
LC2
(1/3V
LCD
)
-V
LC0
(V
LCD
)
-V
LC1
(2/3V
LCD
)
-V
LC2
(1/3V
LCD
)
Frame Start Frame End
1/3 bias and quadruplex multiplexing - LCD_SEG0-LCD_COM1
• DC voltage = 0 (over one frame)