Au Optronics Corporation

Auo Corporation

Nan-Ying Lin

Yu-Hsin Ting

Chung-Lin Fu

Wei-Chun Hsu

Pei-Hua Chen

Tsao-Wen Lu

I-Fang Chen

Shih-Hsi Chang

Wei-Chih Lee

A signal control method suitable for a touch screen is provided. The signal control method comprises: switching a plurality of scan lines to an enabling voltage level sequentially in a display stage; turning on a plurality of switches sequentially to transmit a plurality of display data to a plurality of data lines when a first scan line of the plurality of scan lines is in an enabled voltage level, wherein a first switch of the plurality of switches is coupled to a first data line of the plurality of data lines, and the first data line corresponds to one of a plurality of dummy lines in a vertical direction, when the first scan line is in the enabled voltage level, the first switch is turned on after other switches are turned on; and setting the plurality of dummy lines to a touch voltage in a touch stage.

Signal control method, controller chip and touch screen

A liquid crystal display and a test circuit thereof are provided. The test circuit has a plurality of signal pads, a first data distributor, a plurality of logic circuit units and N switches. N is a positive integer. The signal pads are configured to receive a test data signal, a voltage signal, an enable signal and a plurality of first switch control signals. The first data distributor distributes the test data signal to N output terminals of the first data distributor. Each of the logic circuit units generates a second switch control signal according to the voltage signal, the enable signal and a corresponding one of the first switch control signals. Each of the switches controls the electrical connection between an output terminal of the first data distributor coupled thereto and at least a data line coupled thereto.

Liquid crystal display and test circuit thereof

A shift register includes shift register units, in which at least one shift register unit is coupled to a forestage shift register unit and a post-stage shift register unit, where the at least one shift register unit includes a signal input circuit, a signal output circuit, a pull down circuit and a switching circuit. The signal input circuit electrically coupled to the forestage shift register unit can receive a logic signal from the forestage shift register. The signal output circuit is electrically coupled to the signal input circuit via a control signal terminal and is electrically coupled to the post-stage shift register unit. The signal output circuit can receive a first clock signal. The pull down circuit is electrically coupled to or electrically isolated from the control signal terminal through the switching circuit.

Shift register

A driving method for a display panel is provided. The display panel includes at least a first common signal line, at least a second common signal line and a plurality of pixels arranged as a pixel array. The pixel array includes a first pixel row and a second pixel row electrically connected to the first common signal line and the second common signal line, respectively. The driving method includes steps of: generating a first AC common signal; generating a second AC common signal, wherein the first AC common signal and the second AC common signal are inverse to each other; and providing the first and second AC common signal to the first and second pixel rows through the first and second common signal lines, respectively, by way of N-frame switch, wherein N is a positive integer.

Driving method for display panel

A shift register includes shift register units, in which at least one shift register unit is coupled to a forestage shift register unit and a post-stage shift register unit, where the at least one shift register unit includes a signal input circuit, a signal output circuit, a pull down circuit and a switching circuit. The signal input circuit electrically coupled to the forestage shift register unit can receive a logic signal from the forestage shift register. The signal output circuit is electrically coupled to the signal input circuit via a control signal terminal and is electrically coupled to the post-stage shift register unit. The signal output to circuit can receive a first clock signal. The pull down circuit is electrically coupled to or electrically isolated from the control signal terminal through the switching circuit.

Shift register and method of controlling the shift register

In one aspect, an LCD includes a display panel with a pixel matrix having M scan lines and N data lines, and a multiplexer feed-through compensation circuit, which includes P signal lines for providing P video signals, P multiplexers, and K pairs of control lines providing K pairs of control signals. Each multiplexer is electrically coupled to a corresponding signal line and has K channels. Each channel includes first and second switches parallel-connected between the signal line and a corresponding data line for selectively transmitting the video signal to the corresponding data line. Each pair of control lines is respectively electrically coupled to the first and second switches of a corresponding channel of each multiplexer. Each pair of control signals are configured such that a time turning off one of the first and second switches is earlier than that turning off the other switch.

Display with multiplexer feed-through compensation and methods of driving same

An active liquid crystal display panel includes a pixel array, a gate driving circuit, a data driving circuit, and an analog buffer. The gate driving circuit is used for driving M first scan lines where M is a natural number. The analog buffer is coupled to the gate driving circuit and includes M buffer circuits and a regulator. Each buffer circuit drives a corresponding second scan line according to an output signal of a corresponding first scan line of the M first scan lines, and the regulator is used for maintaining at least one reference voltage supplied to the M buffer circuits.

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Hsin-Chu, Taiwan

Nan-Ying Lin