Au Optronics Corporation

Focaltech Systems Co., Ltd.

Yi-Chiung Chen

Mao-Hsun Cheng

Po-Sheng Shih

Jui-Lung Hung

Chien-Hao Cheng

Yung-Chih Chen

Ching-Sheng Cheng

Cheng-Han Huang

Mei-Sheng Ma

Hsiang-Sheng Chang

Po-Jung Wu

A pixel circuit is disclosed herein, which includes a first switch, a capacitor, a driving transistor, and a light-emitting diode (LED). The first switch outputs voltage data in response to a scan signal. A first terminal of the capacitor and the first switch are coupled to a node. A second terminal of the capacitor receives a reference signal. The driving transistor is coupled to the node, and configured to output current according to a voltage stored in the node. The LED is coupled to the driving transistor, and emits light according to the current. The reference voltage is different during different operation periods. The driving transistor outputs a first current according to the voltage data and the voltage difference, and outputs a second current according to the voltage data during different operation periods, such that the LED emits a first light and a second light during different operation periods.

Pixel circuit

A driving system of touch display panel includes a panel having an active area, a left gate driving circuit and a right gate driving circuit. The left gate driving circuit is disposed on the left side of the active area, and is connected with a plurality of left gate lines to provide gate driving voltages for performing driving in a scanning direction. The right gate driving circuit is disposed on the right side of the active area, and is connected with a plurality of right gate lines to provide gate driving voltages for performing driving in a scanning direction. The scanning direction in which the left gate driving circuit performs driving is opposite to that in which the right gate driving circuit performs driving.

Driving system and method of touch display panel

A driving system of touch display panel includes a panel having an active area and a plurality of touch electrodes, and a gate driving circuit connected with a plurality of gate lines. There is at least one gate line not covered by the touch electrodes among the gate lines disposed in a range constituted by vertically adjacent touch electrodes. The gate line not covered by the touch electrode, at least one gate line previous thereto, and at least one gate line next thereto are selected as the gate lines that influence coupling. When driving the gate lines that influence coupling, the gate driving circuit enables a time difference between an active time of each at least one gate line among the gate lines that influence coupling and an active time of a gate line previous thereto to be greater than a predetermined interval.

A pixel circuit including a light-emitting element, a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor and a storage capacitor is provided. The third transistor is coupled to the second transistor. The fourth transistor is coupled to the second transistor. The storage capacitor is coupled between the first transistor and the fourth transistor. The fifth transistor is coupled to the fourth transistor. The sixth transistor is coupled to the fourth transistor. The seventh transistor is coupled to the fourth transistor and the light-emitting element. The eighth transistor is coupled to the first transistor.

A pixel driving circuit utilizing a transistor having two gate ends as the driving unit for pixels of a display panel to provide a stable driving current to compensate for the variation of threshold voltages of transistors in different pixels and to improve the uniformity of the brightness of the display panel.

Growing community of inventors

Hsinchu, Taiwan

Yi-Chiung Chen