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AN1048D Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN1048D
Description  ST7 software LCD driver
PDF  21 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1048D Datasheet(HTML) 9 Page - STMicroelectronics

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AN1048
LCD drive signals
9/21
2.3.2
Contrast calculation
The performance of an LCD driving system is defined by the contrast:
Contrast(D) = Vrms(ON) / Vrms(Off)
For the quadruplex signal as described on the previous page:
Contrast(D) = Vrms(ON) / Vrms(OFF) = 0.661Vcc / 0.43Vcc = 1.52
Vrms ON
()
1
T
--- f t
()
2
t
d
0
T
∫
=
Vrms ON
()
1
T
---
Vcc
()
2
t
d
0
T
8
---
∫
Vcc
()
2
t
d
T
8
---
2T
8
-------
∫
Vcc
2
----------
⎝⎠
⎛⎞
2
t
d
2T
8
-------
T
∫
++
=
Vrms ON
()
1
T
--- Vcc
()
2 T
8
---
Vcc
()
2 T
8
---
Vcc
()
2
4
-------------------
6T
() 8
⁄
⋅
+
⋅
+
⋅
⎝⎠
⎜⎟
⎛⎞
=
Vrms ON
()
7
16
------ Vcc
()
2
=
Vrms ON
()
0.661Vcc
=
Vrms OFF
()
1
T
---
0
() t
d
0
T
8
---
∫
0
() t
d
T
8
---
2T
8
-------
∫
Vcc
2
----------
⎝⎠
⎛⎞
2
t
d
2T
8
-------
T
∫
++
=
Vrms OFF
()
3
16
------ Vcc
()
2
=
Vrms OFF
()
0.43Vcc
=



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