Panasonic Liquid Crystal Display Co., Ltd.

Avc Technology Co., Ltd.

Takayuki Tajiri

Yoshihisa Ooishi

Shinji Yasukawa

Takahiro Kobayashi

Yoshio Umeda

Ippei Tahara

Nobumichi Takaba

Shingo Arikawa

Hideki Abe

A touch panel device () includes a panel main body () including a plurality of first electrodes (X) extending parallel to one another and a plurality of second electrodes (Y) intersecting with the first electrodes (X), and a detection section (). The detection section () includes a transmission section () for sequentially applying a driving signal to the first electrodes (X), and a current-voltage conversion section () configured to scan the second electrodes (Y) and convert a current flowing through the second electrode (Y) to a voltage signal, an AD conversion section () configured to sample the voltage signal and convert it to digital data, and a touch determination section () for determining a touch position from the converted digital data. The AD conversion section () samples the induced signal for a sampling period which occurs after a preset time which is determined for each of the first electrodes (X) elapses since the application of the driving signal and which includes a peak of a waveform of the induced signal.

Touch panel device and touch panel driving method

A liquid crystal display device includes: a liquid crystal display unit that displays, for each of frames, an image based on an input image signal; a drive unit that applies a voltage based on the input image signal to pixels of the liquid crystal display unit; and a control unit that controls an amplitude of the voltage applied to the pixels. The drive unit applies, in one of the frames, a voltage of the same polarity to the pixels connected to one of the source signal lines. The control unit includes: a temperature-information acquiring unit that acquires temperature information of the drive unit; and a filter unit that acquires high-frequency and low-frequency components of the input image signal in a substantial extending direction of the source signal lines. The control unit controls the amplitude of the applied voltage using the temperature information and an output value of the high-frequency component.

Liquid crystal display device

Growing community of inventors

Hokkaido, Japan

Takayuki Tajiri