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): 5/28頁
文件大小: 139K
代理商: MC68HC705L16
Application Note
Liquid Crystal Displays
AN1763
MOTOROLA
5
Figure 4. External Connections for 1/1, 1/2, and 1/3 Bias
Now the RMS voltages for the static waveform can be calculated from
this formula:
The function f(t) here is the waveform, BPX–FPY.
Figure 3
shows f
2
(t)
of the ON and OFF voltage waveforms for one frame. This serves as a
graphical aid to illustrate the RMS voltages, which are simply the area
under these curves. For the OFF segment, the RMS voltage is obviously
0 volts.
For the ON segment:
where V
LCD
= V
DD
–V
LCD2
, V
LCD3
. This V
RMSON
voltage, typically, is
well above the 90 percent ON threshold, thus producing excellent
contrast.
VLCD1
VLCD2
VLCD3
V
DD
R1
R2
R3
R
VAR
VLCD1
VLCD2
VLCD3
V
DD
R2
R
VAR
VLCD1
VLCD2
VLCD3
V
DD
R1
R3
R
VAR
1/3 BIAS
1/2 BIAS
1/1 BIAS
(A)
(B)
(C)
VRMS
1
T
---
f2t
( )
dt
=
VRMSON
1
2
--
VLCD
2
VLCD
2
+
VLCD
=
=
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