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AN2687 Datasheet(PDF) 18 Page - STMicroelectronics

No. de pieza AN2687
Descripción Electrónicos  STM8S20xxx LCD software driver
Download  22 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2687 Datasheet(HTML) 18 Page - STMicroelectronics

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Software contrast control with the first method
AN2687
18/22
Doc ID 14296 Rev 1
Since Vx = 0 (in case of a decrease in Vrms)
Vrms(on) =
=
Vrms(off) =
Vrms(off) =
Since Vx = 0 (in case of a decrease in Vrms)
Vrms(off) =
Contrast (Dx) =
, where Dx is the contrast calculated with the contrast
control method
Contrast D, between VON and VOFF is constant (quality of contrast). The optical contrast has
been changed only by tuning VON close to the threshold value of the LCD.
1
1x
+
------------
14V
DD
32
------------------
2



1
1x
+
------------ 0.661V
DD
1
TxT
+
-----------------
0
dt
0
dt
V
DD
2
-----------


2
dt
Vx

2
dt 8
0
xT
8
-------
+
2T
8
-------
T
+
T
8
---
2T
8
-------
+
0
T
8
---





1
TxT
+
-----------------
6V
DD
32
---------------
2
dt
Vx
2
x
+



1
1x
+
------------ 0.433V
DD
1
1x
+
------------ 0.661V
DD


1
1x
+
------------ 0.433V
DD


-----------------------------------------------------


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