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AN2687 Datasheet(PDF) 6 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) 6 Page - STMicroelectronics

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LCD principle
AN2687
6/22
Doc ID 14296 Rev 1
In this document, contrast is defined as D = VON(rms) / VOFF(rms).
The applied LCD voltage must also alternate to give a zero DC value to prevent the
electrolytic process and so, ensure a long LCD lifetime.
The higher the multiplexing rates, the lower the contrast. The signal period also has to be
short enough to avoid visible flickering on the display.
Figure 2.
Equivalent electrical schematic of an LCD segment
Note:
The DC value should never be more than 100 mV (refer to the LCD manufacturer’s
datasheet), otherwise the LCD lifetime may be shortened. The frequency range is 30 Hz to
200 Hz typically. If a lower frequency is used, the LCD flickers, if a larger frequency is used,
power consumption increases.
C
RS
S
COM
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