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AN1048 датащи(PDF) 17 Page - STMicroelectronics

номер детали AN1048
подробное описание детали  ST7 software LCD driver
PDF  21 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1048 датащи(HTML) 17 Page - STMicroelectronics

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AN1048
Software contrast control
17/21
Since Vx = 0 (incase of a decrease in Vrms)
Since Vx = 0 (incase of a decrease in Vrms)
Where Dx = Contrast calculation with contrast control method
Vrms ON
()
1
1x
+
------------
14Vcc
2
()
32
--------------------------
Vx
()
2
x
⋅
+
⎝⎠
⎜⎟
⎛⎞
=
Vrms ON
()
1
1x
+
------------
14Vcc
2
()
32
--------------------------
=
Vrms ON
()
1
1x
+
------------0.661Vcc
=
Vrms OFF
()
1
TxT
+
-----------------
0
() t0
() tVcc
() 2
⁄
()
2
tVx
2
() t8
⋅
d
0
xT
8
-------
∫
+
d
2T
8
-------
T
∫
+
d
T
8
---
2T
8
-------
∫
+
d
0
T
8
---
∫
⎝⎠
⎜⎟
⎜⎟
⎛⎞
=
Vrms OFF
()
1
1x
+
------------
6Vcc
2
()
32
----------------------
Vx
2
x
⋅
+
⎝⎠
⎜⎟
⎛⎞
=
Vrms OFF
()
1
1x
+
------------0.18Vcc
=
Contrast Dx
()
1
1x
+
------------0.661Vcc
⎝⎠
⎛⎞
1
1x
+
------------0.18Vcc
⎝⎠
⎛⎞
-------------------------------------------------
=



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