A shift register unit, a gate driving circuit and a display apparatus. The shift register unit comprises a bidirectional scan pre-charging module, a pulling-up module, a pulling-down control module, a reset module and a pulling-down module. A connection point where the bidirectional scan pre-charging module and the pulling-up module are connected serves as a pulling-up control node. A connection point where the pulling-down control module and the pulling-down module are connected serves as a pulling-down control node. The pulling-down control module is configured to perform a pulling-down control according to signals inputted from the second clock signal terminal, the third clock signal terminal, and the fourth clock signal terminal. A bidirectional scanning can be achieved by the bidirectional scan pre-charging module, and the potential at the pulling-up control node and the output signal of the signal output terminal are pulled down to the low level via the pulling-down module, so that the bidirectional pulling-down can be realized. Further, the shift register unit is driven by four clock signal terminals, thus reducing the power consumption of the circuit.

Shift Register Unit, Gate Driving Circuit And Display Apparatus

Embodiments may disclose a display device which includes a display panel including a display pixel displaying an image in response to a common voltage and a data voltage and a sensing pixel outputting a feedback voltage in response to the common voltage and a reference voltage; and a driving circuit unit supplying the data voltage and the reference voltage to the display pixel and the sensing pixel, respectively. The driving circuit unit includes a common voltage estimating part comparing the reference voltage and the feedback voltage to generate a counter signal having a counter value that is stepwise varied according to the comparing of the reference voltage and the feedback voltage; and a common voltage adjusting part stepwise varying the common voltage supplied to the display panel in response to the counter value.

Display device and method of operating the same

A shift register unit, a gate drive circuit, a display device, and a driving method. A shift register unit (10) comprises a blanking input circuit (110), a blanking control circuit (120), a blanking coupling circuit (130), a display input circuit (200), and an output circuit (300). The blanking input circuit (110) is configured to charge a control node (H) in response to a compensation selection control signal and maintain a level of the control node (H). The blanking control circuit (120) is configured to be controlled by the level of the control node (H) and the first clock signal to charge a first node (Q) on the basis of the first clock signal. The blanking coupling circuit (130) is electrically connected to the control node (H), and is configured to perform coupling control on the level of the control node (H) in response to the first clock signal. The shift register unit (10) is capable of implementing random compensation, and can perform coupling control on the level of the control node (H) at the same time, such that the first node (Q) is more sufficiently charged and output abnormality is prevented.

Shift Register Unit, Gate Drive Circuit, Display Device and Driving Method

A source driving circuit includes an output buffer circuit to compensate for slew rate of signals used to drive a display device. The output buffer circuit includes a bias current control signal generating circuit and a channel amplifying circuit. The bias current control signal generating circuit performs an exclusive OR operation on an input signal and an output signal of a reference operational amplifier to generate a bias current control signal. The channel amplifying circuit adjusts the slew rate of a plurality of output voltage signals in response to the bias current control signal. The output signals are then used to control the display device.

Output buffer circuit and source driving circuit including the same

A display driver includes a gamma voltage generation unit, a decoder, and a plurality of source amplifiers. The gamma voltage generation unit generates gamma reference voltages. The decoder transforms pixel data corresponding to received image information into data voltages using the gamma reference voltages. The plurality of source amplifiers outputs the data voltages to a display panel. The gamma voltage generation unit includes a first amplifier receiving a reference voltage and a voltage divider including a plurality of resistors and at least one first switch. The at least one first switch turns on or turns off a first connection between an output node of the first amplifier and the plurality of resistors depending on an operation mode. The voltage divider generates at least one first gamma reference voltage among the gamma reference voltages based on an output voltage of the first amplifier.

Mobile device including a display device and a method of operating the mobile device

A gate driver that comprises n shift registers, wherein n is an integer equal to or larger than 1, each of the n shift registers includes; a start stage which outputs a gate signal and starts its operation in response to a start signal, and a plurality of subsequent stages which are connected to each other in sequence, and which sequentially output a plurality of gate signals in response to a signal output from the start stage, wherein at least one stage of the plurality of subsequent stages is reset by the start signal

Dong-Hyon Ki

Papers

Gate driver and display apparatus having the same