參數(shù)資料
型號: MC68HC705L16
廠商: Motorola, Inc.
英文描述: 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述: 8位微控制器單元(MCU)。(8位微控制器)
文件頁數(shù): 3/28頁
文件大小: 139K
代理商: MC68HC705L16
Application Note
Liquid Crystal Displays
AN1763
MOTOROLA
3
Figure 1. Typical Contrast Characteristic of LCD
Static Mode
Typically, LCD displays are made up of segments or pixels. Segment
displays usually have anywhere from 8 to 16 segments for displaying
each character, while dot matrix displays typically have arrays of 5 x 7
pixels for each character.
Each of these segments or pixels needs to be driven independently in
order for it to be turned on or off independently. The simplest way to do
this is to have a separate frontplane driver for each segment or pixel and
have a single backplane driver for the entire display. This is known as
direct drive or static mode.
Example waveforms of the frontplane and backplane drivers for static
mode are shown in
Figure 2
. The voltage across a segment is the
difference of the backplane waveform and the frontplane waveform. See
Figure 3
.
For a segment to be OFF, its frontplane waveform and backplane
waveform will have the same amplitude and will be completely in phase.
This causes the voltage across the segment to be 0 volts.
For a segment to be ON, its frontplane and backplane waveforms will be
exactly out of phase. This will produce a difference across the segment
equal to the top LCD voltage.
90%
10%
RMS VOLTAGE
C
V
TH
V
SAT
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