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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of driving a ferroelectric liquid crystal display device. SUMMARY OF THE INVENTION In
the method of driving a ferroelectric liquid crystal display device, the present invention changes
the frequency of the bias in the alternating current bias method to change the tiI frequency of
the display panel so as to function as a speaker. It is characterized by having done. This can also
be used for liquid crystals without flow bias effects. 2. Description of the Related Art In a
conventional ferroelectric liquid crystal display device, a driving waveform as shown in FIG. 1 is
used as an alternating current ? ias method. The frequency of the AC bias is 1 KHz to g 10 K Hz.
This improves the display contrast. However, the above-mentioned prior art does not utilize the
sound generated at the time of flow bias driving. In other words, when the bias bias is up, it
displays! The device itself moves by S according to the same principle as a condenser type
speaker and produces sound. At this point, at fII, the tone of the panel can be changed by
changing the frequency of the AC bias. Therefore, the present invention is directed to
incorporating a function as a speaker in a ferroelectric liquid crystal display device. [Intermediate
at-solving means] The ferroelectric liquid crystal display f7 c of the present invention has a
variable frequency of the alternating current bias in the alternating current bias drive waveform,
and the liquid crystal display t? It is characterized in that it can be used as a speaker. [Operation]
The liquid crystal display device having the structure shown in FIG. 2 using the ferroelectric
liquid crystal responds with a drive pulse as shown in FIG. 6c. However, in this method, the
molecular direction is maintained in a fixed direction. Not. If flow / bias is applied here again, one
molecule direction is fixed in a fixed direction, and an improvement in contrast can be obtained.
The frequency of this AC bias is effective if it is at least I KHz and at most 100 KHz, so if it is
convenient for use as a speaker, it may be set at 1 KH 2 to 10 KHz. If you do not want to make a
sound, it will not be heard if it is above 20 KHz. Fig. 1 shows an AC bias drive waveform
according to an embodiment of the present invention, and in this waveform, the frequency of the
pulse 1 in 1 is changed (1 KHz to 10 KHz) to change the timbre and display 7 ta The ilI structure
of the device is shown in FIG. 2 and the alignment film of ft-n 'may be only one side. In this way,
the larger the area, the louder the sound when you actually make a sound. The thinner the 5th
transparent substrate, the louder the sound was.
However, if it is too thin, the strength will be insufficient (about 113 ? is good. As described
above, according to the invention, in the set incorporating the liquid crystal display device #, the
speaker can be omitted, and the set can be miniaturized. Even if it uses the liquid crystal in which
the effect of alternating current bias is not used, if it is a frequency which does not have trouble
in a display, a sound can be made.
Brief description of the drawings
FIG. 1 is an AC bias 1 waveform diagram used in the present invention.
1: AC bias pulse 2: writing pulse 5: erasing pulse Fig. 2 is a cross-sectional view of the liquid
crystal display device. 1 иии Alignment film 2 и и и Transparent '1 @ 3 и и и Transparent substrate 4 и и
и Polarizing plate (crossed up and down at the top and bottom) 5 и и и Liquid crystal Fig. 5 is a
conventional general drive waveform diagram . 1 ... erase pulse 2 ... write pulse or more on the
woman 9L Nog Suasu 511 # attend also tAf; Li door "Rishi location ^ bait Yamaguchi tons) Figure
2 1, down negative Takeno dimension) and Matas," Shiga father 5 J out) Shita bun A
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