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AN2687 Datasheet(PDF) 6 Page - STMicroelectronics |
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AN2687 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 22 page 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 ai14758 |
Número de pieza similar - AN2687 |
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Descripción similar - AN2687 |
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