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Driving Method for Thin Film Transistor/Liquid Crystal Display

IP.com Disclosure Number: IPCOM000117889D
Original Publication Date: 1996-Jul-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Suzuki, H: AUTHOR

Abstract

Disclosed is a Thin Film Transistor/Liquid Crystal Display (TFT/LCD) Driving Method. With this method, TFT/LCD's pixel voltage (Vlc) is modulated periodically, then the viewing direction is also modulated and the averaged viewing angle of the TFT/LCD panel is wider.

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Driving Method for Thin Film Transistor/Liquid Crystal Display

      Disclosed is a Thin Film Transistor/Liquid Crystal Display
(TFT/LCD) Driving Method.  With this method, TFT/LCD's pixel voltage
(Vlc) is modulated periodically, then the viewing direction is also
modulated and the averaged viewing angle of the TFT/LCD panel is
wider.

      Figs. 1 and 2 show an example of this method.  Fig. 1 shows
the adjacent four pixels with Dot-Inversion-Drive.  "+", "-" are
pixel voltage (Vlc) polarity for Alternating Current (AC) drive.
"Up", "down" are viewing directions of each pixel.  "Up" corresponds
to the lower pixel voltage and "down" corresponds to the higher pixel
voltage as shown in Fig. 2.  The combination of "+" "-" and "up"
"down" is repeated every four screen frames.

      Fig. 2 shows the pixel voltage of each screen frame.  By
changing "dVsig", the viewing angle width can be controlled.

      This method is applicable not only to the Dot-Inversion-Drive
panel, but also to the Horizontal-Line-Inversion or
V-Line-Inversion-Drive panel.