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AN2687 Datasheet(PDF) 18 Page - STMicroelectronics

No. de Pieza. AN2687
Descripción  STM8S20xxx LCD software driver
Descarga  22 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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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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