LCX027AK 查看數據表（PDF） - Sony Semiconductor

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LCX027AK

1.4cm (0.55-inch) NTSC/PAL Color LCD Panel

Sony Semiconductor 

LCX027AK

9. Method of Measuring the Optimum Vcom

There are two methods of measuring the optimum Vcom using the photoelectric element.

9-1. Method of Measuring Flicker

In the field invert drive mode, adjust the flicker level of the half tone (Vsig = 1.5 to 2.5V) using the

photoelectric element and oscilloscope so that its 30Hz component becomes minimum. The Vcom value

at this time is taken to be the optimum Vcom.

9-2. Method of Measuring Contrast

In the normal 1H invert drive mode, adjust the optical output voltage of the half tone (Vsig = 1.5 to 2.5V) so

that it becomes minimum. The Vcom value at this time is taken to be the optimum Vcom.

Example of Back Light Spectrum (Reference)

0.6

0.4

0.2

0

380

480

580

680

780

Wave length 380 – 780 [nm]

– 15 –

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