Samsung Electronics Co., Ltd.

Ju-Man Lee

Hyong-Gon Lee

Seung-Hwan Moon

Sang-Chul Lee

Seok-Tae Kim

Hyun-sang Cho

Sun-Yung Kwon

Liquid crystal display devices include an array of liquid crystal display cells arranged as a plurality of columns of display cells electrically coupled to respective data lines and a plurality of rows of display cells electrically coupled to respective gate lines. A gate line on/off voltage generator and gate line driving circuit are provided to drive at least a first gate line with a turn-on voltage of first polarity (e.g., positive voltage) and simultaneously driving at least a second gate line with a turn-off voltage of second polarity (e.g., negative voltage). First and second screen clearing circuits are also provided to improve the screen clearing capability of the liquid crystal display device. The first screen clearing circuit can be electrically coupled to the first gate line to perform the function of driving the first gate line from the turn-on voltage (e.g., positive voltage) to a ground reference voltage upon termination of a power supply signal; and the second screen clearing circuit of different design can be electrically coupled to the second gate line to perform the function of driving the second gate line from the turn-off voltage (e.g., negative voltage) to the ground reference voltage upon termination of the power supply signal. These driving functions may act to increase the conductivity of the TFTs in the 'off' display cells and thereby improve the rate of charge leakage from the storage capacitors and the liquid crystal capacitors therein.

Liquid crystal display devices having improved screen clearing

A liquid crystal display and method of operating the display includes an array of LCD elements arranged as a plurality of rows and a plurality of columns. A respective one of a plurality of data lines is connected to a respective column of LCD elements. A column of dummy LCD elements is disposed adjacent an outermost column of the array of LCD elements, and a dummy data line is connected to the dummy LCD elements of the column of dummy LCD elements. Preferably, a respective one of the plurality of data lines extends along a side of the column of LCD elements to which it is connected, between the column of LCD elements to which it is connected and an adjacent column of LCD elements, and the dummy data line extends along a side of the column of dummy LCD elements, between the column of dummy elements and the adjacent outermost column of the array of LCD elements. Data line driving means may be provided for driving a respective one of the plurality of data lines with a respective data signal having a respective polarity, a data signal driving a respective data line having a polarity which is inverted with respect to the polarity of a data signal driving an adjacent column of LCD elements. Dummy data line driving means may be provided for driving the dummy data line with a dummy data signal which has a polarity which is inverted with respect to the polarity of the data signal driving the data line connected to the outermost column of LCD elements. The column of dummy LCD elements may be obscured from a user of the LCD.

Liquid crystal display with dummy data driving to produce edge column

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Kyungki-do, South Korea

Ju-Man Lee