User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 786
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• V
RMS
= 0.33 × V
LCD_OUT
• The LCD display pixel that is connected to LCD_SEG0 and LCD_COM1 will be OFF with this waveform
Figure 33.40. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_SEG0-LCD_COM1
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_COM2
• 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_COM2 will be ON with this waveform
Figure 33.41. LCD 1/3 Bias and Quadruplex Multiplexing - LCD_SEG0-LCD_COM2
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_COM2
• DC voltage = 0 (over one frame)
• V
RMS
= 0.33 × V
LCD_OUT
• The LCD display pixel that is connected to LCD_SEG0 and LCD_COM3 will be OFF with this waveform
Figure 33.42. LCD 1/3 Bias and Quadruplex Multiplexing- LCD_SEG0-LCD_COM3
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
33.3.4 LCD Contrast
Different LCD panels have different characteristics and also temperature may affect the characteristics
of the LCD panels. To compensate for such variations, the LCD driver has a programmable contrast that