Kabushiki Kaisha Toshiba

Junichi Machida

Takeshi Suyama

Isao Abe

Takeshi Nakashiro

Nobuyuki Kawano

A pen input liquid crystal display has row electrodes, column electrodes orthogonal to the row electrodes, and a liquid crystal layer interposed between the row and column electrodes. A pen input detecting signal is applied to one of the column electrodes, and display signals to the other column electrodes. The column electrode that receives the pen input detecting signal is sequentially shifted among the column electrodes, to simultaneously carry out a pen input scanning operation and an image displaying operation.

Pen input liquid crystal display capable of displaying high-contrast

A level shifting circuit has a high-level shifter connected to a first high voltage and to a first low voltage, for amplifying the peak voltage of an input signal; a low-level shifter connected to a second high voltage lower than the first high voltage and to a second low voltage lower than the first low voltage, for amplifying the trough voltage of the input signal; a high-voltage controlling transistor connected to the first high voltage and to an output node and turned on and off according to the output of the high-level shifter; and a low-voltage controlling transistor connected to the output node and to the second low voltage and turned on and off according to the output of the low-level shifter complementarily to the high-voltage controlling transistor. The level shifting circuit is capable of amplifying both the peak and trough voltages of an input signal.

Growing community of inventors

Chiba-ken, Japan

Junichi Machida